A - ROAD WORKS

BASIC APPROACH AND GENERAL CONDITIONS FOR THE PREPARATION OF STANDARD DATA BOOK

The basic approach for the preparation of Standard Data Book for Road works is indicated as under:

1. Description of Items:

The description of items is given briefly and linked with the relevant clause of the MORT&H specifications for Roads and Bridge works (Fourth Revision), which may be referred for detailed description provision and interpretation.

2.Mechanical Means:

Due to mechanization of construction works, rate analyses for various items have been prepared using mechanical means. However, manual means have also been provided for certain cases, where access may be inaccessible for machines or quantum of work may not be large enough to justify the use of machines.

3.Overhead Charges:

3.1 The overhead charges provided in the analysis for road works is 10(Ten) percent which shall include the following elements:

i)Site accommodation, setting up plant, access road, water supply, electricity and general site arrangements.

ii)Office furniture equipment and communication.

iii)Expenditure on

a) Corporate Office of contractor.

b) Site supervision.

c) Documentation and as built drawings.

iv)Mobilisation/de-mobilisation of resources.

v)Labour camps with minimum amenities and transportation to work sites.

vi)Light vehicles for site supervision including administrative and managerial requirements.

vii)Laboratory equipments and quality control including field and laboratory testing.

viii)Minor T&P and survey instruments and setting our works, including verification of line, dimension, trial pits and bore holes, where required.

ix)Watch and ward.

x)Traffic Management during construction.

xi)Expenditure on safeguarding environment.

xii)Sundries.

xiii)Financing expenditure.

xiv)Sales/Turn over tax.

xv)Work insurance/compensation.

4.Contractors Profit:

Contractors profit is also been taken uniformly as 10 percent, over the cost of items including overhead charges.

5.Basic Inputs:

The rates for material and labour adopted in the S.O.R. are as per the current market rate and Labour Department, Government of Meghalaya.

6.Plants and Equipments:

6.1A dozer is proposed for excavation where cutting and filling for the roadway is within

100m. For longer leads, a combination of hydraulic excavator and tipper is proposed.

6.2Keeping in view the job and managerial factors and the age factor of machines, the output of plant and equipment is taken approximately 70 percent of the rated capacity given by the manufacturer under ideal conditions.

6.3It has been assumed that a water tanker would make one trip per hour on an average. Water charges have not been included for items where the requirement is very nominal. It is assumed that the same would be covered under sundries.

6.4Output of plant/equipment is considered for the compacted quantities.

6.5The usage charges for machine include ownership charges, cost of repair and maintenance including replacement of tyres and running and operating charges which include crew, fuel and lubricants.

7.Materials:

7.1Quantities of material given in the rate analysis are approximate for the purpose of estimating and include normal wastages. Actual consumption would have to be based on mix design.

7.2The rates for material should include basic cost at locations of stone crusher, loading, unloading, cost of carriage and stacking at plant sites as the case may be.

7.3The alternative proposal for crushing own aggregate by installing crusher should be compared with procurement of crushed aggregates from the market and proposal found economical may be adopted.

7.4The specification of materials shall be governed by section 1000 of MORT&H specifications for Road and Bridge Works. (Fourth Revision).

8.Labour:

8.1The wages for skilled, semi-skilled and unskilled labour, adopted in the S.O.R. have been taken as per the latest Government Circular issued from Labour Department. However, the rates for Head Mason, Carpenter, Welder, Blacksmith, Driller, Painter, etc., have been adopted as per the actual current labour rates prevailing in the construction industry.

8.2One mate has been provided for 25 labourers.

9.Carriage of Materials:

9.1The Unit for vehicle for carriage has been taken as under:

a.In hours where lead is defined including time required for loading and unloading.

b.In tonne - Km. where lead is variable. The loading and unloading for such cases have been provided separately.

9.2Where the quantity of material to be transported is small such as dismantled materials and the same are required to be loaded manually, provision of tractor-trolley has been made instead of tipper.

10General:

10.1The clause numbers refer to MORT&H specifications for Road and Bridge works. (Fourth Revision).

10.2Assumptions made have been indicated in respective chapter in the form of notes where required.

10.3Sundries to cater for unforeseen contingency and miscellaneous items have been added in the overhead charges.

10.4Arrangement for traffic during construction shall be as per Clause 112 of MORT&H specifications for Road and Bridge works. (Fourth Revision).

10.5The supply of materials will be taken either at the location of mixing plant or at the work site as the case may be.

10.6Contractor will make his own arrangement for borrowing of earth. However, compensation for earth taken from private land has been included in the rate analysis for construction of embankment with borrowed earth.

10.7The requirement of machinery have been worked out assuming effective working periods of six hours per shift of 8 hours.

10.8The cost of earthwork in urban roads will be comparatively higher due to following reasons:

a)There is mixed traffic on urban roads like slow moving hand and animal driven carts, rickshaws, cycles, two/three wheeler apart from the usual vehicular traffic resulting into traffic jams. This causes loss of working time, which may be in the range of 10 - 15 percent.

b)There is considerable disruption of traffic adversely affecting the efficiency of the working parties including machines due to congestion caused by pedestrian traffic, local road side vendors, parking of vehicles by the road side, encroachments by the shopkeepers and local shops who make use of the berms of the road in front of these shops and unauthorized conversion of road berms into mini local market. The output of manpower and machines is substantially reduced due to factors mentioned above.

c)Cost of living in urban areas is comparatively more resulting into higher wages.

d)At times, work is executed during night time due to heavy traffic during day time. This involves extra expenditure by way of making arrangement for lighting and special transport of working parties due to odd hour.

In the light of above, the authorities engaged in preparing the cost estimates may exercise their judgment and cater for the additional cost to the extent of 2 to 3 percent, keeping in view the severity of factors mentioned above. Support details for extra cost based on actual site conditions in specific cases will have to be given in justification.

10.9Credit for Dismantled material.

The dismantled material should be examined and a realistic assessment made for the credit for such materials, which can be utilized for works or auctioned.

10.10In the rate analysis of stone items, the quantities of sub-items involved in that analysis like excavation for foundation, concrete, painting, lettering, etc., have been given. The rates for such items may be taken from relevant chapters where the same have already been analyzed.

10.11The source of material and samples are required to be approved by the Engineer before start of any work.

10.12The rates of items include cost of testing of soil, materials and works.

10.13The use of surface by construction vehicles shall be governed by Clause 119 of MORT&H specifications. (Fourth Revision).

10.14The contractor shall arrange to provide and maintain an adequate equipped field laboratory as per Clause 121.

10.15Quality control of works shall be governed by Section 900 of MORT&H specifications.

10.16The various activities of works shall also be documented by photographs and video cassettes as per Clauses 125 & 126 of MORT&H specifications.

10.17The classifications of soil shall be as per Clause 301.2 of MORT&H specification.

10.18The earth excavated from foundation has been considered to be backfilled and balance utilized locally for road work except in the case of marshy soil.

10.19The rate analysis for removal of unsuitable soil does not provide for replacement by suitable soil which will have to be paid separately.

10.20Item for hilly terrain have been analyzed separately.

10.21The hire charges rate for machinery and equipments are applicable as present usage rate. Suitable escalation may be added for subsequent years depending upon the market situation.

10.2210 percent extra cement may be provided for concreting under water, where required.

10.23Grade of cement may be adopted as per mix design.

10.24Quantities of cement in various grades of cement concrete have been taken as per IRC 21-2000 and IC 18-2000.

10.25The rate for road delineators, boundary pillars and metal beam crash barriers have been analyzed in Chapter 8.

10.26The coarse and fine aggregates shall conform to IS:383.

10.27Certain equipment like road rollers, are required to be available at site for complete period of the shift though from the consideration of their output, they may be required only for 3 to 4 hours. This is necessitated to match with the output of other associated machines like HMP, Pavers, etc,. In such cases, the hire charges or road rollers have been multiplied with a factor of 0.65 to account for the idle period.

10.28For pricing of RCC slab culvert, the items given in respective chapters in bridges section may be referred.

10.29Wherever electric generator has not been provided to run a plant or equipment, it is assumed that it is fitted with a diesel engine.

10.30Some of the firms in the field of construction chemicals have evolved new brands of chemical for water proofing, sealing of cracks, cementing compounds, etc,. the market can be explored to meet such requirements.

10.31Some of the major steel producing firms have evolved thermo-mechanically treated steel which has enhanced strength, better corrosion resistance, ductility, weld ability and high temperature thermal resistance. Enquiries from these firms can be made on technical specification and use of such products considered in works based on performance in works where these have already been used.

10.32Provision of Fly ash has been made in embankment construction, Sub-base construction and Cement Concrete Pavement.

10.33The Standard Data Book is for department use only. It cannot be produced in Court of Law as reference/authority and thus it is Privilege Document.

10.34In case it is decided to include the following items and their maintenance in the BOQ, the scope and specifications should be worked out and defined in the detailed manner in the tender document to avoid any dispute during execution.

MORT&H Clause Item.

120Site Office and furniture for Engineer and his Staff.

122Site residential accommodation for Engineer and other supervisory staff.

124Providing and maintaining vehicle for the Engineer.

B - BRIDGE WORKS

BASIC APPROACH AND GENERAL CONDITIONS FOR THE PREPARATION OF STANDARD DATA BOOK

The basic approach for the preparation of Standard Data Book for Bridge works is indicated as under:

Description of Items:

The description of items is given briefly and linked with the relevant Clause of the Ministrys specifications for Road and Bridge Works (Fourth Revision), which may be referred for detailed description, provisions and interpretation.

Overhead Charges:

The overhead charges include the following elements:

1)Site accommodation, setting up plant, access road, water supply, electricity and general site arrangements.

2)Office furniture equipment and communications.

3)Expenditure on

a) Corporate office of contractor.

b) Site supervision.

c) Documentation and as built drawings.

4)Mobilisation/de-mobilisation of resources.

5)Labour camps with minimum amenities and transportation to work sites.

6)Light vehicles for site supervision including administrative and managerial requirements.

7)Laboratory equipment and quality control including field and laboratory testing.

8)Minor T&P and survey instruments and setting out works, including verification of line dimensions, trial pits and bore holes, where required.

9)Watch and ward.

10)Traffic Management during construction.

11)Expenditure on safeguarding environment.

12)Sundries.

13)Financing expenditure.

14)Sales/Turn over tax.

15)Work insurance/compensation.

For the purpose of calculation of overhead charges, the projects or categorized into three basic types depending upon width of carriageway, length of the bridge and the present cost.

Category 1: Major Bridge including State of the Art Bridges and Minor Bridges25%

Category 2: Minor Bridge included in the Road Packages20%

Category 3: Rehabilitation of Bridges30%

For the bridge having more than two lanes, equivalent length and cost can be adjusted accordingly.

Contractors Profit:

Contractors profit is also been taken uniformly as 10 percent, over the cost of items including overhead charges.

Basic Inputs:

The rates for material and labour adopted in the S.O.R. are as per the current market rate and Labour Department, Government of Meghalaya.

Plants and Equipments:

The usage hire charges of machinery/equipment have been worked out based upon the present cost of equipment, repairs, POL and operational charges. These charges are applicable for the current base year. For subsequent years, these are required to be escalated depending upon the market situation.

In the analysis of rates, for any items of work, capacity of equipment with corresponding output has been indicated which is most common in use for estimation purpose. Seeing the volume of job, different capacity equipment with corresponding output can be provided for preparing estimate.

Materials:

The rates of materials should include basic cost at crushing units, cost of carriage including loading and unloading and stacking of material at site of work and shall be determined through market enquiries.

Labour:

1. The wages for skilled, semi-skilled and unskilled labour, adopted in the S.O.R. have been taken as per the latest Government Circular issued from Labour Department. However, the rates for Head Mason, Carpenter, Welder, Blacksmith, Driller, Painter, etc., have been adopted as per the actual current labour rates prevailing in the construction industry.

2. One mate has been provided for 25 labourers.

Carriage of Materials:

The Unit for vehicle for carriage has been taken as under:

a.In hours where lead is defined including time required for loading and unloading.

b.In tonne-Km. where lead is variable. The loading and unloading for such cases have been provided separately.

General:

(i) Bridge bearings and expansion joints are readymade items commercially produced by specialized firms and in certain cases using imported technology and parts. The rates of these items are to be obtained directly from different manufacturers approved by the Ministry and shall be adopted after comparison.

(ii) Normal methods of curing has been covered in the schedule.

(iii) The testing of material and finished items of work is covered under overhead charges.

(iv) Traffic arrangements during construction are covered under overhead charges. Provision of temporary division, where required shall be governed by Clause 112.3.

(v) In the items for well foundation, provision for nominal island/temporary protection, deep island/cofferdams with wooden ballies and sheet piles has been made.

(vi) For some of the items, certain size/specifications have been assumed. If sizes/specifications other than the same are adopted, corresponding modifications may be made in the input of analysis.

(vii) The items do not cover all components of bridge projects for all situations. There may be specialized items for specific cases, which need to be analysed keeping in view the basic approach.

(viii) In case bridge construction works are to be done on wide and deep water channel in major rivers, etc., provision of floating barrages, etc., for taking the construction materials and equipments beside water shall also be made separately.

(ix) Analysis for sinking of wells covers diameters from 6m to 12m and twin D Type of size 12m x 6m. For other shapes like rectangular or any other size, the rates of sinking may worked out on prorata basis.

(x) The lift for casting of concrete in well seining may be 2 to 2.5m restricting the free fall of concrete to 1.5m and concreting layer to 450mm.

The Standard Data Book is for Department use only. It cannot be produced in Court of Law as reference/authority and this is a privilege document.

CHAPTER 1

1. CARRIAGE OF MATERIALS

1.1 Preamble :

1.1.1The provision of tipper has been made in hours where lead is known like disposal of the materials upto 1 KM. In case where lead is variable like carriage of hot mix from plants or earth from borrow areas, provision has been made in terms of tonne-kilometer (t-km), which can be adopted as per actual conditions.

1.1.2The cost of carriage will vary depending upon the riding surface of the road. Provision has accordingly been made considering surface roads, unsurfaced graveled roads and katcha tracks.

1.1.3The analysis for loading and unloading of Stone Boulders, stone aggregates, sand, kankar, moorum, etc., has been done for manual means, as per site conditions.

1.1.4 Analysis of rate for loading and unloading have been done for manual means for adoption as per actual situations.

CHAPTER-1 : CARRIAGE OF MATERIALS

Sl No

Reference to MoRT&H Specifications

Item No.

Descriptions

Unit

Rate

In figures (`)

In words

1.1

Loading and unloading of stone boulders / stone aggregates / sand / kanker / moorum. Placing tipper at loading point, loading with front end loader, dumping, turning for return trip, excluding time for haulage and return trip)

cum

153.00

Rupees One Hundred and Fifty Three only

1.2

Loading and Unloading of Boulders by Manual Means

cum

169.00

Rupees One Hundred and Sixty Nine Only

1.3

Loading and Unloading of Cement or Steel by Manual Means and stacking.

tonne

234.00

Rupees Two Hundred and Thirty Four only

1.4

Cost of Haulage Excluding Loading and Unloading

(i)

Surfaced Road

tonne-km

7.00

Rupees Seven only

(ii)

Un-surfaced Gravelled Road

tonne-km

8.00

Rupees Eight only

(iii)

Kutcha Track and Track in river bed / nallah bed etc...

tonne-km

16.00

Rupees Sixteen only

CHAPTER 2

2. SITE CLEARANCE

2.1.1Preamble :

Unless otherwise stated, the rates include sorting and disposal of unserviceable material and stacking of serviceable material with all lifts and upto a lead of 1000 m.

2.1.2Clearing and Grubbing :

This work shall consist of cutting, removing, and disposing of all materials such as trees, bushes, shrubs, stumps, roots, grass, weeds, top organic soil not exceeding 150 mm in thickness, rubbish, etc., which in the opinion of the Engineer are unsuitable for incorporation in the works, from the area of road land containing road embankment, drains, cross-drainage structures and such other areas as may be specified on the drawings or by the Engineer. It shall include necessary excavation, backfilling of pits resulting from uprooting of trees and stumps to required compaction, handling, salvaging and disposal of cleared materials. Clearing and grubbing shall be performed in advance of earthwork operations and in accordance with the requirements of MoRT&H Specifications.

2.1.3 Preservation of Property/Amenities :

(i) Roadside trees, shrubs, any other plants, poles lines, fences, signs, monuments, buildings, pipelines, sewers and all highway facilities within or adjacent to the Highway which are not to be disturbed shall be protected from injury or damage. The Contractor shall provide and install at his own expense, suitable safeguards approved by the Engineer for this purpose.

(ii) During clearing and grubbing, the Contractor take all adequate precautions against soil erosion, sedimentation, water pollution, etc., The Contractor shall submit to the Engineer for approval, his work plan including the procedure to be followed for disposal of waste materials, etc., and the schedules for carrying out temporary and permanent erosion control works.

2.1.4 Methods, Tools and Equipments :

(i) Only such methods, tools and equipment as approved by the Engineer and which will not affect the property to be preserved shall be adopted for the Work. If the area has thick vegetation/roots/trees, a crawler or pneumatic tyred dozer of adequate capacity may be used for clearance purposes. The dozer shall have ripper attachments for removal of tree stumps.

(ii) All trees, stumps, etc,. falling within excavation and fill lines shall be cut to such depth below ground level that in no case these fall within 500 mm of the sub-grade. Also, all vegetation such as roots, under-growth, grass and other deleterious matter unsuitable for incorporation in the embankment/sub-grade shall be removed between fill lines to the satisfaction of the Engineer. On areas beyond these limits, trees and stumps required to be removed as directed by the Engineer shall be cut down to 1 m below ground level so that these do not present an unsightly appearance.

(iii) All branches of trees extending above the roadway shall be trimmed as directed by the Engineer.

(iv) All excavations below the general ground level arising out of the removal of trees, stumps, etc., shall be filled with suitable material and compacted thoroughly so as to make the surface at these points conform to the surrounding area.

(v) Ant-hills both above and below the ground, as are liable to collapse and obstruct free subsoil water flow shall be removed and their workings, which may extend to several metres, shall be suitably treated.

2.1.5 Disposal of materials

(i) All materials arising from clearing and grubbing operations shall be the property of Government and shall be disposed of by the Contractor and hereinafter provided or directed by the Engineer.

(ii) Trunks, branches and stumps of trees shall be cleaned of limbs and roots and stacked. Also boulders, stones and other materials usable in road construction shall be nearly stacked as directed by the Engineer. Stacking of stumps, boulders, stones etc., shall be done at specified spots with all lifts and upto a lead of 1000m.

(iii) All products of clearing and grubbing which, in the opinion of the Engineer, cannot be used or auctioned shall be cleared away from the roadside in a manner as directed the Engineer. Care shall be taken to see that unsuitable waste materials are disposed of in such a manner that there is no likelihood of these getting mixed up with the materials meant for embankment, sub-grade and road construction.

(iv) Dismantling of utilities like water pipe lines, electric and telephone lines, should be done under the supervision of concerned departments and prior information to the users should be disseminated.

(v) In certain items of dismantling, like, pipe culverts, utilities, etc., excavation in earth and dismantling of masonry works is not included in this analysis for which suitable notes have been inserted. These items are required to be priced separately based on actual quantities at site and nature of work.

(vi) The dismantled materials should be examined and a realistic assessment and provision made after due process for the credit for such materials, which can be utilised for works or auctioned.

(vii) In case where lead for disposal is more than 1000m, extra cost of carriage is required to be added based on tonne-kilometerage.

(viii) All minor T&P items required for dismantling are already included in overhead charges.

(ix) For dismantling of utility services like water pipe lines, electric and telephone lines, prior intimation should be given to users.

CHAPTER-2 : SITE CLEARANCE

Sl No

Reference to MoRT&H Specifications

Item No.

Descriptions

Unit

Rate

In figures (`)

In words

2.1

201

Cutting of Trees, including Cutting of Trunks, Branches and Removal. Cutting of trees, including cutting of trunks, branches and removal of stumps, roots, stacking of serviceable material with all lifts and up to a lead of 1000 metres and earth filling in the depression/pit.

(i)

Girth from 300 mm to 600 mm

each

234.00

Rupees Two Hundred and Thirty Four only

(ii)

Girth from 600 mm to 900 mm

each

531.00

Rupees Five Hundred and Thirty One only

(iii)

Girth from 900 mm to 1800 mm

each

865.00

Rupees Eight Hundred and Sixty Five only

(iv)

Girth above 1800 mm

each

1496.00

Rupees One Thousand Four Hundred and Ninety Six only

2.2

201

Clearing Grass and Removal of Rubbish Clearing grass and removal of rubbish upto a distance of 50 metres outside the periphery of the area.

hectare

9959.00

Rupees Nine Thousand Nine Hundred and Fifty Nine only

2.3

201

Clearing and Grubbing Road Land. Clearing and grubbing road land including up-rooting rank vegetation, grass, bushes, shrubs, saplings and trees girth up to 300 mm, removal of stumps of trees cut earlier and disposal of unserviceable materials and stacking of serviceable material to be used or auctioned up to a lead of 1000 metres including removal and disposal of top organic soil not exceeding 150 mm in thickness.

(i)

By Manual Means:-

A

In area of light jungle

hectare

31043.00

Rupees Thirty One Thousand and Forty Three Only

B

In area of thorny jungle

hectare

42168.00

Rupees Forty Two Thousand One Hundred and Sixty Eight only'

(ii)

By Mechanical Means

A

In area of light jungle

hectare

43272.00

Rupees Forty Three Thousand Two Hundred Seventy Two Only

B

In area of thorny jungle

hectare

52524.00

Rupees Fifty Two Thousand Five Hundred Twenty Four Only

2.4

202

Dismantling of Structures. Dismantling of existing structures like culverts, bridges, retaining walls and other structure comprising of masonry, cement concrete, wood work, steel work, including T&P and scaffolding wherever necessary, sorting the dismantled material, disposal of unserviceable material and stacking the serviceable material with all lifts and lead of 1000 metres.

(i)

Lime /Cement Concrete

I

By Manual Means

A

Lime Concrete, cement concrete grade M-10 and below

cum

411.00

Rupees Four Hundred and Eleven only

B

Cement Concrete Grade M-15 & M-20

cum

451.00

Rupes Four Hundred and Fifty One only

C

Prestressed / Reinforced cement concrete grade M-20 & above

cum

922.00

Rupees Nine Hundred and Twenty Two only

II

By Mechanical Means for items No. 202( b) & ( c)

A

Cement Concrete Grade M-15 & M-20

cum

827.00

Rupees Eight Hundred and Twenty Seven only

B

Prestressed / Reinforced cement concrete grade M-20 & above

cum

1256.00

Rupees One Thousand Two Hundred and Fifty Six Only

(ii)

Dismantling Brick / Tile work

A

In lime mortar

cum

331.00

Rupees Three Hundred and Thirty One Only

B

In cement mortar

cum

371.00

Rupees Three Hundred and Seventy One Only

C

In mud mortar

cum

315.00

Rupees Three Hundred and Fifteen Only

D

Dry brick pitching or brick soling

cum

308.00

Rupees Three Hundred and Eight Only

(iii)

Dismantling Stone Masonry

A

Rubble stone masonry in lime mortar

cum

347.00

Rupees Three Hundred and Forty Seven Only

B

Rubble stone masonry in cement mortar.

cum

371.00

Rupees Three Hundred and Seventy One Only

C

Rubble Stone Masonry in mud mortar.

cum

331.00

Rupees Three Hundred and Thirty One Only

D

Dry rubble masonry

cum

323.00

Rupees Three Hundred and Twenty Three Only

E

Dismantling stone pitching/ dry stone spalls.

cum

315.00

Rupees Three Hundred and Fifteen Only

F

Dismantling boulders laid in wire crates including opening of crates and stacking dismantled materials.

cum

331.00

Rupees Three Hundred and Thirty One Only

(iv)

Wood work wrought framed and fixed in frames of trusses upto a height of 5 m above plinth level

cum

636.00

Rupees Six Hundred and Thirty Six Only

(v)

Steel work in all types of sections upto a height of 5 m above plinth level excluding cutting of rivet.

A

Including dismembering

tonne

1285.00

Rupees One Thousand Two Hundred and Eighty Five Only

B

Excluding dismembering.

tonne

969.00

Rupees Nine Hundred and Sixty Nine Only

C

Extra over item No( V ) A and( V ) B for cutting rivets.

tonne

10.00

Rupees Ten Only

(vi)

Scraping of bricks dismantled from brick work including stacking.

A

In lime/Cement mortar

1000 numbers

697.00

Rupees Six Hundred and Ninety Seven Only

B

In mud mortar

1000 numbers

249.00

Rupees Two Hundred and Forty Nine Only

(vii)

Scraping of Stone from dismantled stone masonry

A

In cement and lime mortar

cum

281.00

Rupees Two Hundred and Eighty One Only

B

In Mud mortar

cum

59.00

Rupees Fifty Nine Only

(viii)

Scarping plaster in lime or cement mortar from brick/ stone masonry

sqm

12.00

Rupees Twelve Only

(ix)

Removing all type of hume pipes and stacking within a lead of 1000 metres including earthwork and dismantling of masonry works.

A

Up to 600 mm dia

metre

103.00

Rupees One Hundred and Three Only

B

Above 600 mm to 900 mm dia

metre

141.00

Rupees One Hundred and Forty One Only

C

Above 900 mm

metre

240.00

Rupees Two Hundred and Forty Only

2.5

202

Dismantling of Flexible Pavements Dismantling of flexible pavements and disposal of dismantled materials up to a lead of 1000 metres, stacking serviceable and unserviceable materials separately.

I

By Manual Means

A

Bituminous courses

cum

742.00

Rupees Seven Hundred and Forty Two Only

B

Granular courses

cum

584.00

Rupees Five Hundred and Eighty Four Only

II

By Mechanical Means

A

Bituminous course

cum

527.00

Rupees Five Hundred and Twenty Seven Only

2.6

202

Dismantling of Cement Concrete Pavement. Dismantling of cement concrete pavement by mechanical means using pneumatic tools, breaking to pieces not exceeding 0.02 cum in volume and stock piling at designated locations and disposal of dismantled materials up to a lead of 1000 metres, stacking serviceable and unserviceable materials separately.

cum

1833.00

Rupees One Thousand Eight Hundred and Thirty Three Only

2.7

202

Dismantling Guard Rails:

Dismantling guard rails by manual means and disposal of dismantled material with all lifts and up to a lead of 1000 metres, stacking serviceable materials and unserviceable materials separately.

metre

88.00

Rupees Eighty Eight Only

2.8

202

Dismantling Kerb Stone:

Dismantling kerb stone by manual means and disposal of dismantled material with all lifts and up to a lead of 1000 metre.

metre

27.00

Rupees Twenty Seven Only

2.9

202

Dismantling Kerb Stone channel. Dismantling kerb stone channel by manual means and disposal of dismantled material with all lifts and up to a lead of 1000 metre.

metre

40.00

Rupees Forty Only

2.10

202

Dismantling Kilometre Stone: Dismantling of kilometre stone including cutting of earth, foundation and disposal of dismantled material with all lifts and lead upto 1000 m and back filling of pit.

A

5th KM stone

each

385.00

Rupees Three Hundred Eighty Five Only

B

Ordinary KM Stone

each

216.00

Rupees Two Hundred Sixteen Only

C

Hectometre Stone

each

43.00

Rupees Forty Three Only

.11

202

Dismantling of Fencing: Dismantling of barbed wire fencing/ wire mesh fencing including posts, foundation concrete, back filling of pit by manual means including disposal of dismantled material with all lifts and up to a lead of 1000 metres, stacking serviceable material and unserviceable material separately.

metre

40.00

Rupees Forty Only

2.12

202

Dismantling of CI Water Pipe Line: Dismantling of CI water pipe line 600 mm dia including disposal with all lifts and lead upto 1000 metres and stacking of serviceable material and unserviceable material separately under supervision of concerned department.

metre

139.00

Rupees One Hundred and Thirty Nine Only

2.13

202

Removal of Cement Concrete Pipe of SewerGutter: Removal of cement concrete pipe of sewer gutter 1500 mm dia under the supervision of concerned department including disposal with all lifts and up to a lead of 1000 metres and stacking of serviceable and unserviceable material separately but excluding earth excavation and dismantling of masonry works.

metre

184.00

Rupees One Hundred and Eighty Four Only

2.14

202

Removal of Telephone / Electric Poles andLines: Removal of telephone / Electric poles including excavation and dismantling of foundation concrete and lines under the supervision of concerned department, disposal with all lifts and up to a lead of 1000 metres and stacking the Serviceable and unserviceable material separately.

each

162.00

Rupees One Hundred and Sixty Two Only

CHAPTER 3

3. EARTHWORK, EROSION CONTROL AND DRAINAGE

3.1 EXCAVATION FOR ROADWAY AND DRAINS

3.1.1 Scope :

This work shall consist of excavation, removal and satisfactory disposal of all materials necessary for the construction of roadway, side drains and waterways in accordance with requirements of MoRT&H Specifications and the lines, grades and cross-sections shown in the drawings or as indicated by the Engineer. It shall include the hauling and stacking of or hauling to sites of embankment and subgrade construction, suitable cut materials as required, as also the disposal of unsuitable cut materials in specified manner, trimming and finishing of the road to specified dimensions or as directed by the Engineer.

3.1.2 Authority for Classification :

The classification of excavation shall be decided by the Engineer and his decision shall be final and binding on the Contractor. Merely the use of explosives in excavation will not be considered as a reason for higher classification unless blasting is clearly necessary in the opinion of the Engineer.

3.1.3Construction Operation :

After the site has been cleared, the limits of excavation shall be set out true to lines, curves, slopes, grades and sections as shown on the drawings or as directed by the Engineer. The Contractor shall not excavate outside the limits of excavation. Subject to the permitted tolerances, any excess depth/ width excavated beyond the specified levels/ dimensions on the drawings shall be made good at the cost of the Contractor with suitable material of characteristics similar to that removed and compacted to the requirements of Clause 305.

3.1.4 Excavation General :

(i) All excavations shall be carried out in conformity with the directions laid here-in-under and in a manner approved by the Engineer. The work shall be executed in such a manner so that the suitable materials available from excavation are satisfactorily utilised as decided upon beforehand.

(ii) The Contractor shall provide all labour, survey instruments and materials such as strings, pegs, nails, bamboos, stones, lime, mortar, concrete etc., required in connection with the setting out of works and the establishment of Bench Marks. The Contractor shall be responsible for the maintenance of Bench Marks and other marks and stakes as long as in the opinion of the Engineer, they are required for the work.

(iii) While planning or executing excavations, the Contractor shall take all adequate precautions against soil erosion, sedimentation, water pollution etc., and take appropriate drainage measures to keep the site free from water logging etc.

(iv) All debris and loose material on the slopes of cuttings shall be removed. No backfilling shall be allowed to obtain required slopes excepting that when boulders or soft materials are encountered in cut slopes, these shall be excavated to approved depth on instructions of the Engineer and the resulting cavities filled with suitable material and thoroughly compacted in an approved manner.

(v) After excavation, the sides of excavated area shall be trimmed and the area contoured to minimize erosion and ponding, allowing for natural drainage to take place. If trees were removed, new trees shall be planted, as directed by the Engineer. The cost of planting new trees shall be deemed to be incidental to the work.

3.1.5 Rock excavation :

(i) Rock, when encountered in road excavation, shall be removed upto the formation level or as otherwise indicated on the drawings. Where, however, unstable shales or other unsuitable materials are encountered at the formation level, these shall be excavated to the extent of 500 mm below the formation level or as otherwise specified. In all cases, the excavation operations shall be so carried out that at no point on cut formation the rock protrudes above the specified levels. Rocks and large boulders which are likely to cause differential settlement and also local drainage problems should be removed to the extent of 500 mm below the formation level in full formation width including drains and cut through the side drains.

(ii) Slopes in rock cutting shall be finished to uniform lines corresponding to slope lines shown on the drawings or as directed by the Engineer. Notwithstanding the foregoing, all loose pieces of rock on excavated slope surface which move when pierced by a crowbar shall be removed.

3.1.6Excavation of road shoulders/median for widening of pavement or providing treated shoulders :

In works involving widening of existing pavements or providing treated shoulders, unless otherwise specified, the shoulder/verge/median shall be removed to their full width and to levels shown on drawings or as indicated by the Engineer. While doing so, care shall be taken to see that no portion of the existing pavement designated for retention is loosened or disturbed. If the existing pavement gets disturbed or loosened, it shall be dismantled and cut to a regular shape with sides vertical and the disturbed/loosened portion removed completely and re-laid as directed by the Engineer, at the cost of the Contractor.

3.1.7 Excavation for surface/sub-surface drains :

Where the Contract provides for construction of surface/sub-surface drains to Clause 309, excavation for these shall be carried out in proper sequence with other works as approved by the Engineer.

3.1.8 Classification of Excavated Material :

All materials involved in excavation shall be classified by the Engineer in the following manner:

(A) Soil

This shall comprise topsoil, turf, sand, silt, loam, clay, mud, peat, black cotton soil, soft shale or loose moorum, a mixture of these and similar material which yields to the ordinary application of pick, spade and/or shovel, rake or other ordinary digging implement. Removal of gravel or any other nodular material having dimensions in any one direction not exceeding 75 mm occurring in such strata shall be deemed to be covered under this category.

(B) Ordinary Rock (not requiring blasting)

(i) Rock types such as laterites, shales and conglomerates, varieties of limestone and sandstone etc., which may be quarried or split with crow bars, also including any rock which in dry state may be hard, requiring blasting but which, when wet, becomes soft and manageable by means other than blasting;

(ii) Macadam surfaces such as water bound and bitumen/tar bound; soling or roads, paths etc, and hard core; compact moorum or stabilised soil requiring grafting tool or pick or both and shovel, closely applied; gravel and cobble stone having maximum dimension in any one direction between 75 and 300 mm;

(iii) Lime concrete, stone masonry in lime mortar and brick work in lime/cement mortar below ground level, reinforced cement concrete which may be broken up with crow bars or picks and stone masonry in cement mortar below ground level; and

(iv) Boulders which do not require blasting having maximum dimension in any direction of more than 300 mm, found lying loose on the surface or embedded in river bed, soil, talus, slope wash and terrace material of dissimilar origin.

(C) Hard Rock (requiring blasting)

(i) Any rock or cement concrete for the excavation of which the use of mechanical plant and/or blasting is required.

(ii) Reinforced cement concrete (reinforcement cut through but not separated from the concrete) below ground level; and

(iii) Boulders requiring blasting.

(D) Hard Rock (blasting prohibited)

Hard rock requiring blasting as described under (c) but where blasting is prohibited for any reason and excavation has to be carried out by chiseling, wedging or any other agreed method.

(E) Marshy Soil

This shall include soils like soft clays and peats excavated below the original ground level of marshes and swamps and soils excavated from other areas requiring continuous pumping or bailing out of water.

3.1.9 Disposal of excavated materials :

(i) All the excavated materials shall be the property of the Employer. The material obtained from the excavation of roadway, shoulders, verges, drains, cross-drainage works etc., shall be used for filling up of (i) roadway embankment, (ii) the existing pits in the right-of-way and (iii) for landscaping of the road as directed by the Engineer, including leveling and spreading with all lifts and lead upto 1000 m and no extra payment shall be made for the same.

(ii) All hard materials, such as hard moorum, rubble, etc., not intended for use as above shall be stacked neatly on specified land as directed by the Engineer with all lifts and lead upto 1000m.

(iii) Unsuitable and surplus material not intended for use within the lead specified above shall also, if necessary, be transported with all lifts and lead beyond initial 1000 m, disposed of or used as directed by the Engineer.

3.1.10 Backfilling :

Backfilling of masonry/concrete/hume pipe drain excavation shall be done with approved material after concrete/masonry/hume pipe is fully set and carried out in such a way as not to cause undue thrust on any part of the structure and/or not to cause differential settlement. All space between the drain walls and the side of the excavation shall be refilled to the original surface making due allowance for settlement, in layers generally not exceeding 150 mm compacted thickness to the required density, using suitable compaction equipment such as mechanical tamper, rammer, or plate compactor as directed by the Engineer.

3.1.11 Blasting Operations:

(i) Blasting shall be carried out in a manner that completes the excavation to the lines indicated in drawings, with the least disturbance to adjacent material. It shall be done only with the written permission of the Engineer. All the statutory laws, regulations, rules, etc., pertaining to the acquisition, transport, storage, handling and use of explosives shall be strictly followed.

(ii) The Contractor may adopt any method or methods of blasting consistent with the safety and job requirement. Prior to starting any phase of the operation the Contractor shall provide information describing pertinent blasting procedures, dimensions and notes.

(iii) The replacement of unsuitable soil by suitable soil shall be included separately in the estimate. The rate analyses for removal of unsuitable soil does not provide for replacement by suitable soil.

(iv) The possibility of using the blasted rock fragments for backfilling behind structures of backfilling of foundation pits or filling in medians/ separators or use in service road shall be examined before proposing disposal of excavated rock.

(v) In case of hill roads, the cut earth can be pushed down the valley in case there is no objection. In that case, cost of disposal is not required to be provided.

(vi) For inhabited areas, controlled blasting with limited charges of explosives has been provided. This involves smaller drill holes and additional requirement of electric detonators. Provision has accordingly been made.

(vii) Earth excavated from drains can be used in roadway berms. Hence, carriage for disposal of same is not provided.

CHAPTER-3 : EARTH WORK, EROSION CONTROL AND DRAINAGE

Sl No

Reference to MoRT&H Specifications

Item No.

Descriptions

Unit

Rate

In figures (`)

In words

3.1

301

Excavation in Soil by Manual Means. Excavation for roadway in soil using manual means including loading in truck for carrying of cut earth to embankment site with all lifts and lead upto1000 metres.

cum

156.00

Rupees One Hundred and Fifty Six Only

3.2

301

Excavation in ordinary rock by manual means: Excavation in ordinary rock using manual means including loading in a truck and carrying of excavated material to embankment site with in all lifts and leads upto 1000 metres

cum

197.00

Rupees One Hundred and Ninety Seven Only

3.3

301

Excavation in Soil with Dozer with lead upto 100 metres:

Excavation for road way in soil by mechanical means including cutting and pushing the earth to site of embankment upto a distance of 100 metres (average lead 50 metres), including trimming bottom and side slopes in accordance with requirements of lines, grades and cross sections.

cum

140.00

Rupees One Hundred and Forty Only

3.4

301

Excavation in Ordinary Rock with Dozer with lead upto 100 metres: Excavation for roadway in ordinary rock by deploying a dozer, 80 HP including cutting and pushing the cut earth to site of embankment upto a distance of 100 metres ( average lead 50 metres ), trimming bottom and side slopes in accordance with the requirements of lines, grades and cross sections.

cum

235.00

Rupees Two Hundred and Thirty Five only

3.5

301

Excavation in Hard Rock (requiring blasting) with disposal upto 1000 metres: Excavation for roadway in hard rock (requiring blasting) by drilling, blasting and breaking, trimming of bottom and side slopes in accordance with requirements of lines, grades and cross sections, loading and disposal of cut road with in all lifts and leads upto 1000 metres.

cum

412.00

Rupees Four Hundred and Twelve Only

3.6

301

Excavation in Soil using Hydraulic Excavator CK 90 and Tippers with disposal upto 1000 metres:

Excavation for roadwork in soil with hydraulic excavator of 0.9 cum bucket capacity including cutting and loading in tippers, trimming bottom and side slopes, in accordance with requirements of lines, grades and cross sections, and transporting to the embankment location within all lifts and lead upto 1000 metres.

cum

74.00

Rupees Seventy Four Only

3.7

301

Excavation in Ordinary Rock using Hydraulic Excavator CK-90 and Tippers with disposal upto 1000 metres: Excavation for roadway in ordinary rock with hydraulic excavator of 0.9 cum bucket capacity including cutting and loading in tippers, transporting to embankment site within all lifts and lead upto 1000 m, trimming bottom and side slopes in accordance with requirements of lines, grades and cross sections.

cum

110.00

Rupees One Hundred and Ten Only

3.8

301

Excavation in Hard Rock (blasting prohibited): Excavation for roadway in hard rock (blasting prohibited) with rock breakers including breaking rock, loading in tippers and disposal within all lifts and lead upto 1000 metres, trimming bottom and side slopes in accordance with requirements of lines, grades and cross sections.

A

Mechanised

cum

703.00

Rupees Seven Hundred Three Only

B

Manual Method

cum

1097.00

Rupees One Thousand Ninety Seven Only

3.9

301

Excavation in Hard Rock (controlled blasting) with disposal upto 1000 metres: Excavation for roadway in hard rock with controlled blasting by drilling, blasting and breaking, trimming of bottom and side slopes in accordance with requirements of lines, grades and cross sections, loading and disposal of cut road with in all lifts and leads upto 1000 metres.

cum

507.00

Rupees Five Hundred Seven Only

3.10

301

Excavation in Marshy Soil: Excavation for roadway in marshy soil with hydraulic excavator 0.9 cum bucket capacity including cutting and loading in tippers and disposal with in all lifts and lead upto 1000 metres, trimming of bottom and side slopes in accordance with requirements of lines, grades and cross sections.

cum

80.00

Rupees Eighty Only

3.11

301

Removal of Unserviceable Soil with Disposal upto 1000 metres: Removal of unserviceable soil including excavation, loading and disposal upto 1000 metres lead but excluding replacement by suitable soil which shall be paid separately as per Clause 305.

cum

74.00

Rupees Seventy Four Only

3.12

303

Pre-splitting of Rock Excavation Slopes: Carrying out excavation in hard rock to achieve a specified slope of the rock face by controlled use of explosives and blasting accessories in properly aligned and spaced drill holes, collection of the excavated rock by a 80 HP dozer, loading in tipper by a front end loader and disposing of the material with all lifts and lead upto 1000 metres, all as specified in Clause No. 303

sqm

156.00

Rupees One Hundred and Fifty Six Only

3.13

304

Excavation for Structures:

Earth work in excavation of foundation of structures as per drawing and technical specification, including setting out, construction of shoring and bracing, removal of stumps and other deleterious matter, dressing of sides and bottom, backfilling the excavation earth to the extent required and utilising the remaining earth locally for road work.

(i)

Ordinary soil

A

Manual Means (Depth upto 3 m)

cum

159.00

Rupees One Hundred and Fifty Nine Only

B

Mechanical Means (Depth upto 3 m)

cum

57.00

Rupees Fifty Seven Only

(ii)

Ordinary rock (not requiring blasting)

A

Manual Means (Depth upto 3 m)

cum

199.00

Rupees One Hundred and Ninety Nine Only

B

Mechanical Means

cum

77.00

Rupees Seventy Seven Only

(iii)

Hard rock ( requiring blasting )

A

Manual Means

cum

435.00

Rupees Four Hundred and Thirty Five Only

(iv)

Hard rock ( blasting prohibited )

A

Mechanical Means

cum

1013.00

Rupees One Thousand and Thirteen Only

(v)

Marshy soil

A

Manual means ( upto 3 m depth)

cum

611.00

Rupees Six Hundred and Eleven Only

B

Mechanical Means

cum

214.00

Rupees Two Hundred and Fourteen Only

3.14

305.4.3

Scarifying Existing Granular Surface to a Depth of 50 mm by Manual Means: Scarifying the existing granular road surface to a depth of 50 mm and disposal of scarified material within all lifts and leads upto 1000 metres.

sqm

29.00

Rupees Twenty Nine Only

3.15

305.4.3

Scarifying existing bituminous surface to a depth of 50 mm by mechanical means: Scarifying the existing bituminous road surface to a depth of 50 mm and disposal of scarified material with in all lifts and lead upto 1000 metres.

sqm

7.00

Rupees Seven Only

3.16

305

Construction of embankment with Material Obtained from Borrow Pits: Construction of embankment with approved material obtained from borrow pits with all lifts and leads, transporting to site, spreading, grading to required slope and compacting to meet requirement of Table 300-2

cum

540.00

Rupees Five Hundred Forty Only

3.17

305

Construction of Embankment with material deposited from Roadway Cutting: Construction of embankment with approved materials deposited at site from roadway cutting and excavation from drain and foundation of other structures graded and compacted to meet requirement of Table 300-2

cum

183.00

Rupees One Hundred and Eighty Three Only

3.18

305

Construction of Subgrade and Earthen Shoulders: Construction of subgrade and earthen shoulders with approved material obtained from borrow pits with all lifts & leads, transporting to site, spreading, grading to required slope and compacted to meet requirement of Table 300-2

cum

565.00

Rupees Five Hundred and Sixty Five only

3.19

305.3.4

Compacting Original Ground

Case-I

Compacting original ground supporting subgrade: Loosening of the ground upto a level of 500 mm below the subgrade level, watered, graded and compacted in layers to meet requirement of Table 300-2 for subgrade construction.

cum

88.00

Rupees Eighty Eight Only

Case-II

Compacting original ground supporting embankment

cum

59.00

Rupees Fifty Nine Only

3.20

305

Stripping and Storing Top Soil: Stripping, storing of top soil by road side at 15 m internal and re-application on embankment slopes, cut slopes and other areas in localities where the available embankment material is not conducive to plant growth

cum

141.00

Rupees One Hundred and Forty One Only

3.21

Stripping, storing and re-laying top soil from borrow areas in agriculture fields: Stripping of top soil from borrow areas located in agriculture fields, storing at a suitable place, spreading and re-laying after taking the borrow earth to maintain fertility of the agricultural field, finishing it to the required levels and satisfaction of the farmer.

cum

84.00

Rupees Eighty Four Only

3.22

307

Turfing with Sods:

Furnishing and laying of the live sods of perennial turf forming grass on embankment slope, verges or other locations shown on the drawing or as directed by the engineer including preparation of ground, fetching of sods and watering

sqm

81.00

Rupees Eighty One Only

3.23

309

Surface Drains in Soil:

Construction of unlined surface drains of average cross sectional area 0.40 sqm in soil to specified lines, grades, levels and dimensions to the requirement of clause 301 and 309. Excavated material to be used in embankment within a lead of50 metres (average lead 25 metres)

A

Mechanical means

metre

90.00

Rupees Ninety Only

B

Manual Means

metre

40.00

Rupees Forty Only

3.24

309

Surface Drains in Ordinary Rock: Construction of unlined surface drain of average cross sectional area 0.4 sqm in ordinary rock to specified lines, grades, levels and dimensions as per approved design and to the requirement of Clause 301 to 309. Excavated material to be used in embankment at site.

A

Mechanical Means

metre

182.00

Rupees One Hundred and Eighty Two Only

B

Manual Means

metre

60.00

Rupees Sixty Only

3.25

309

Sub Surface Drains with Perforated Pipe: Construction of subsurface drain with perforated pipe of 100 mm internal diameter of metal/ asbestos cement/ cement concrete/PVC, closely jointed, perforations ranging from 3 mm to 6 mm depending upon size of material surrounding the pipe, with 150 mm bedding below the pipe and 300 mm cushion above the pipe, cross section of excavation 450 x 550 mm. Excavated material to be utilised in roadway at site

metre

374.00

Rupees Three Hundred and Seventy Four Only

3.26

309

Aggregate Sub- Surface Drains:

Construction of aggregate sub surface drain 300 mm x 450 mm with aggregates conforming to Table 300-4, excavated material to be utilised in roadway

Metre

118.00

Rupees One Hundred and Eighteen Only

3.27

310

Preparation and Surface Treatment of formation: Preparation and surface treatment of formation by removing mud and slurry, watering to the extent needed to maintain the desired moisture content, trimming to the required line, grade, profile and rolling with 8-10 tonne smooth wheeled roller, complete as per clause 310.

Sqm

4.00

Rupees Four Only

3.28

313

Construction of Rock fill Embankment: Construction of rock fill embankment with broken hard rock fragments of size not exceeding 300 mm laid in layers not exceeding 500 mm thick including filling of surface voids with stone spalls, blinding top layer with granular material, rolled with vibratory road roller, all complete as per clause 313

Cum

103.00

Rupees One Hundred Three Only

EARTHWORK ON HILL ROAD

3.29

301

A

Excavation in Hilly Area in Soil by Mechanical Means:

Excavation in soil in hilly area by mechanical means including cutting and trimming of side slopes and disposing of excavated earth with all lifts and lead upto 1000 metres.

Cum

181.00

Rupees One Eighty One Only

3.30

B

Excavation in Hilly Area in Soil by Manual Means: Excavation in soil in hilly area by manual means including cutting and trimming of side slopes and disposing of excavated earth with all lifts and lead upto 1000 metres

Cum

191.00

Rupees One Hundred and Ninety One Only

3.31

301

Excavation in Hilly Area in Ordinary Rock by Mechanical Means not Requiring Blasting: Excavation in hilly area in ordinary rock not requiring blasting by mechanical means including cutting and trimming of slopes and disposal of cut material with all lift and lead upto 1000 metres

Cum

260.00

Rupees Two Hundred and Sixty Only

3.32

301

Excavation in Hilly Areas in Hard Rock Requiring Blasting:

Excavation in hilly areas in hard rock requiring blasting, by mechanical means including trimming of slopes and disposal of cut material with all lifts and lead upto 1000 metres.

cum

341.00

Rupees Three Hundred and Forty One Only

3.33

301

Excavation in Hilly Areas in Hard Rock with controlled Blasting:

Excavation in hilly areas in hard rock with controlled blasting, by drilling, blasting and breaking trimming of bottom and side slopes in accordance with requirement of lines, grades and crossection and disposal of cut road within all lifts and lead upto 1000 metres.

cum

424.00

Rupees Four Hundred Twenty Four Only

CHAPTER 4

4. SUB-BASES, BASES ( NON-BITUMINOUS) AND SHOULDERS

4.1 Preamble:

4.1.1Quantities of materials provided are approximate and are meant for the purpose of estimating only. Actual quantities shall be as per mix design.

4.1.2 For construction of sub-base, two alternatives as under have been provided:

a. Mix in place method

b. Plant mix method

4.1.3While providing for the rate of materials, detailed local enquiries have been made and prevailing market rates ascertained from concerned suppliers in the area keeping in view the location of crushing plants and lead involved.

4.2. GRANULAR SUB-BASE

4.2.1 Scope :

This work shall consist of laying and compacting well-graded material on prepared subgrade in accordance with the requirements of MoRT&H specifications. The material shall be laid in one or more layers as sub-base or lower sub-base and upper sub-base (termed as sub-base hereinafter) as necessary according to lines, grades and cross-sections shown on the drawings or as directed by the Engineer.

4.2.2Materials :

(i) The material to be used for the work shall be natural sand, moorum, gravel, crushed stone or combination thereof depending upon the grading required. Materials like crushed slag, crushed concrete, brick metal and kankar may be allowed only with the specific approval of the Engineer. The material shall be free from organic or other deleterious constituents and conform to one of the three gradings given in Table. 4.1.

Table 4.1. (Table 400-1) Grading for Close-Graded Granular Sub-base Materials

IS Sieve

Per cent by weight Passing the IS sieve

Designation

Grading I

Grading II

Grading III

75.0 mm

53.0 mm

26.5 mm

9.50 mm

4.75 mm

2.36 mm

0.425 mm

0.075 mm

100

80-100

55-90

35-65

25-55

20-40

10-25

3-10

-

100

70-100

50-80

40-65

30-50

15-25

3-10

-

-

100

65-95

50-80

40-65

20-35

3-10

CBR Value (Minimum) 30 25 20

(iii) While the gradings in Table 4.1 are in respect of close-graded granular sub-base materials, one each for maximum particle size of 75 mm, 53 mm and 26.5 mm, the corresponding gradings for the coarse-graded materials for each of the three maximum particle sizes are given at Table 4.2 The grading to be adopted for a project shall be as specified in the Contract.

Table. 4.2 (Table 400-2) Grading for Coarse Graded Granular Sub-base Materials

IS Sieve

Designation

Per cent by weight passing the IS sieve

Grading I

Grading II

Grading III

75.0 mm

53.0 mm

26.5 mm

9.50 mm

4.75 mm

2.36 mm

0.425 mm

0.075 mm

100

55-75

10-30