Project: Cooling Tower , Tibbiya College Dawakhana, AMU

S.No. Description

Dia of

Bar ᶲ

No. of

Bars

No.of elements

Total No. of Bars

Cutoff Length

(m)

Weight (kg)

Raft Reinforcement

F1 (1250x1200)

Bottom Main T10 8 6 48 1.4 41.46

Bottom Distribution T10 8 6 48 1.45 42.94

TB-1 (300x450)

CB & CT T16 8 2 16 9.6 242.69

Rings T8 71 2 142 1.32 74.04

TB-1 (300x450)

CB & CT T16 8 3 24 5.6 212.35

Rings T8 39 3 117 1.32 61

Pedestal

P1 (300x400) T16 10 6 60 2.4 227.52

Master Ring T8 17 6 102 1.24 49.96

Rec. Ring 1 T8 17 6 102 0.84 33.84

Hook T8 17 6 102 0.48 19.34

U-Bars 600mm

long T16 18 6 108 1.5 255.96

Total 1261.1

Add 5% wastage

63.055

Net

Total 1324.16

Project: Cooling Tower , Tibbiya College Dawakhana, AMU

MB

S.No. Description No. L B H Quantity Units

Sub Head I Earth work

1.1

Earth work in excavation by mechanical means (Hydraulic

excavator) / manual means over areas (exceeding 30cm in depth, 1.5m in width as well as 10 sqm

on plan) including getting out and disposal of excavated earth, lead up to 50m and lift up to 1.5m,as directed by Engineer-in-Charge.

F1 6 2.45 2.4 1.5 52.92 cum.

TB1 2 8.2 0.23 0.4 1.51 cum.

TB1 3 4.3 0.23 0.4 1.19 cum.

Total 55.62 cum.

1.2

Extra for every additional lift of 1.5 m or part thereof in

excavation /banking excavated or stacked materials.

F1 6 2.45 2.4 0.3 10.58 cum.

Total 10.58 cum.

1.3

Supplying and filling in plinth with Jamuna sand under floors,

including watering, ramming, consolidating and dressing

complete

1 8.3 4.2 0.15 5.23 cum.

1.4

Filling available excavated earth (excluding rock) in trenches,

plinth, sides of foundations etc. in layers not exceeding 20cm in

depth, consolidating each deposited layer by ramming and watering, lead up to 50 m and lift

up to 1.5 m.

Back Filling

Excavation - Concrete Volume 46.04 cum.

2 Sub Head II Cement Concrete

work

2.1

Providing and laying in position cement concrete of specified grade excluding the cost of

centering and shuttering - All work up to plinth level : 1:3:6 (1

Cement : 3 coarse sand(zone-III) : 6 graded stone aggregate 20 mm

nominal size).

F1 6 1.45 1.4 0.1 1.22 cum.

TB1 2 8.2 0.23 0.1 0.38 cum.

TB1 3 4.3 0.23 0.1 0.3 cum.

Total 1.9 cum.

3 Sub Head III RCC WORK

3.1

Providing and laying in position specified grade of reinforced

cement concrete, excluding the cost of centering, shuttering,

finishing and reinforcement - All work up to plinth level : 1:1.5:3 (1 cement : 1.5 coarse sand (zone-III) : 3 graded stone aggregate 20 mm

nominal size).

F1 6 1.25 1.2 0.3 2.7 cum.

Trapezoidal

portion=(A1+A2+sqrt(A1*A2))*h/3 6 0.25 1.5 0.61 1.09 cum.

TB1 2 8.2 0.23 0.45 1.7 cum.

TB1 3 4.3 0.23 0.45 1.34 cum.

P1 6 0.4 0.3 1.18 0.85 cum.

Total 7.68 cum.

3.2

Centering and shuttering including strutting, propping etc. and

removal of form for : Foundations, footings, bases of columns, etc.

for mass concrete.

F1 6 4.9 0.3 8.82 sqm.

TB1 2 16.4 0.45 14.76 sqm.

TB1 3 8.6 0.45 11.61 sqm.

P1 6 1.4 1.18 9.91 sqm.

Total 45.1 sqm.

3.3

Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in

position and binding all complete. Thermo-Mechanically Treated

bars.

1324.155 kg

5 Sub Head Steel Work

5.1

Structural steel work riveted, bolted or welded in built up sections, trusses and framed

work, including cutting, hoisting, fixing in position and applying a priming coat of approved steel

primer all complete.

ISMB 200 6 6 36 R.M

ISMB 250

4 4.5 18 R.M

2 9.5 19 R.M

ISMC 100 2 4.5 9 R.M

ISMC 150 5 4.5 22.5 R.M

ISMC 200 4 2.8 11.2 R.M

ISMC 75 24 1.85 44.4 R.M

Cross-Bracing ISA 50x50x6 8 4.5 36 m

Horizontal Bracing ISA 50x50x6 4 3.7 14.8 m

Total 50.8 m

MS Flat 40X6 mm 51 1.55 79.05 m

MS Railing (40X40X3) 121 1 121 m

MS Railing (40X40X3) 1 30 30 m

Project: Cooling Tower , Tibbiya College Dawakhana, AMU SUMMARY

I.No. Description of Item Quantity Rate (Rs)

Unit Amount(Rs)

Sub-Head I : Earth Work

1.1

Earth work in excavation by mechanical means (Hydraulic

excavator) / manual means over areas (exceeding 30cm in depth,

1.5m in width as well as 10 sqm on plan) including getting out and

disposal of excavated earth, lead up to 50m and lift up to 1.5m,as

directed by Engineer-in-Charge.

a) All kinds of soil 55.62 Cum

1.2

Extra for every additional lift of 1.5 m or part thereof in excavation /banking excavated or stacked

materials.

a) All kinds of soil. 10.58 Cum

1.3

Supplying and filling in plinth with Jamuna sand under floors, including

watering, ramming, consolidating and dressing complete

5.23

1.4

Filling available excavated earth (excluding rock) in trenches, plinth, sides of foundations etc. in layers

not exceeding 20cm in depth, consolidating each deposited layer by ramming and watering, lead up

to 50 m and lift up to 1.5 m.

46.04 Cum

Sub Head II : Concrete Work

2.1

Providing and laying in position cement concrete of specified grade excluding the cost of centering and

shuttering - All work up to plinth level :

a) 1:3:6 (1 Cement : 3 coarse

sand(zone-III) : 6 graded stone aggregate 20 mm nominal size).

1.90 Cum

Sub Head III : Reinforced Cement Concrete

3.1

Providing and laying in position specified grade of reinforced

cement concrete, excluding the cost of centering, shuttering, finishing

and reinforcement - All work up to plinth level :

a) 1:1.5:3 (1 cement : 1.5 coarse sand

(zone-III) : 3 graded stone aggregate 20 mm nominal size).

8.06 Cum

3.2 Centering and shuttering including

strutting, propping etc. and removal of form for :

a) Foundations, footings, bases of

columns, etc. for mass concrete. 49.61 Sqm

3.3

Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete up to plinth

level.

a) Thermo-Mechanically Treated bars

of grade Fe-500 D or more. 1324.16 Kg

Sub-Head IV : Steel Work

5.1

Structural steel work riveted, bolted or welded in built up sections,

trusses and framed work, including cutting, hoisting, fixing in position

and applying a priming coat of approved steel primer all complete.

ISMB 200 (@25.4 kg per meter) 914.40

ISMB 250 (@37.3 kg per meter) 1380.10

ISMC 100 (@9.2kg per meter) 82.80

ISMC 150 (@16.4kg per meter) 369.00

ISMC 200 ( @22.1kg per meter) 247.52

ISMC 75 ( @6.8kg per meter) 301.92

ISA 50x50x6 (@4.5 kg per meter) 228.60

MS Flat 40X6 (@1.9kg/m) 150.20

MS Sq. Railing 40X40X3 (@4kg/m) 604.00

Project: Cooling Tower, Tibbiya College Dawakhana, AMU, Aligarh , U.P Work Specification

S.No. Description

1 EARTH WORK

1.1 PROTECTIONS

Excavation shall be securely barricaded and provided with proper caution signs

1.2 SITE CLEARANCE

Before the earth work is started, the area coming under cutting and filling shall be cleared of shrubs, rank vegetation, grass, brushwood and trees

1.3 SETTING OUT AND MAKING PROFILES

A masonry pillar to serve as a bench mark will be erected at a suitable point in the area, which is visible from the largest area. Necessary profiles with strings stretched on pegs, bamboos or ‘Burjis’ shall be made to indicate the correct formation levels before the work is started.

1.4 EXCAVATION IN ALL KINDS OF SOILS

All excavation operations manually or by mechanical means shall include excavation and ‘getting out’ the excavated materials and disposal upto stated lead.

In case of excavation for foundation in trenches or over areas, the bed of excavation shall be to the correct level or slope and consolidated by watering and ramming. If the excavation for foundation is done to a depth greater than that shown in the drawings or as required by the Engineer-in-Charge, the excess depth shall be made good by the contractor at his own cost with the concrete of the mix used for levelling/ bed concrete for foundations.

The excavation shall be done true to levels, slope, shape and pattern indicated in drawing. Only the excavation shown on the drawings with additional allowances for centering and shuttering shall be measured and recorded for payment.

1.5 FILLING

The earth used for filling shall be free from all roots, grass, shrubs, rank vegetation, brushwood,tress, sapling and rubbish

Filling with excavated earth shall be done in regular horizontal layers each not exceeding 20 cm in depth. All lumps and clods exceeding 8 cm in any direction shall be broken. Each layer shall be watered and consolidated with steel rammer or ½ tonne roller. Where specified, every third and top must layer shall also be consolidated with power roller of minimum 8 tonnes. The top and sides of filling shall be neatly dressed.

1.6 MEASUREMENTS

The length and breadth of excavation or filling shall be measured with a steel tape correct to the nearest cm. The depth of cutting or height of filling shall be measured, correct to 5 mm, by recording levels before the start of the work and after the completion of the work. The cubical contents shall be worked out to the nearest two places of decimal in cubic metres.

2 Reinforced Cement Concrete

2.1 Reinforcement

General Requirements

Reinforcement Steel of grade 500 D TMT bars shall be used and should be clear and free from loose mill scales, dust, loose rust, coats of paints, oil or other coating which may destroy or reduce bond. It shall be stored in such a way as to avoid distortion and to prevent deterioration and corrosion. Prior to assembly of reinforcement on no account any oily substance shall be used for removing the rust.

Placing in Position

Fabricated reinforcement bars shall be placed in position as shown in the drawings. The bars crossing one another shall be tied together at every intersection with two strands of annealed steel wire 0.9 to 1.6 mm thickness twisted tight to make the skeleton of the steel work rigid so that the reinforcement does not get displaced during deposition of concrete.

The bars shall be kept in correct position by the following methods:

(a) In case of beam and slab construction pre-cast cover blocks in cement mortar 1:2 (1 cement : 2 coarse sand) about 4x4 cm section and of thickness equal to the specified cover shall be placed between the bars and shuttering, so as to secure and maintain the requisite cover of concrete over reinforcements.

(b)

In case of columns and walls, the vertical bars shall be kept in position by means of timber templates with slots accurately cut in them: or with clock of cement mortar 1:2 (1 cement: 2 coarse sand) of required size suitable tied to the reinforcement to ensure that they are in correct position during concreting.

Tolerance on Placing of Reinforcement

Reinforcement shall be placed within the following tolerances

Tolerance in spacing

(a) For effective depth, 200 mm or less +10 mm

(b) For effective depth, more than 200 mm +15 mm

2.2 Cover

The minimum nominal cover to meet durability requirements shall be as under:-

Column 40mm

Beam 25mm

Slab 15mm

Footing 65mm

2.3 Measurement

Reinforcement including authorized spacer bars and lappages shall be measured in length of different diametre, as actually (not more than as specified in the drgs.) used in the work nearest to a centimetre and their weight calculated on the basis of standard weight given below. In case actual unit weight of the bars is less than standard unit weight, but within variation, in such cases weight of reinforcement shall be calculated on the basis of actual unit weight. Wastage and unauthorized overlaps shall not be paid for. Annealed steel wire required for binding or tack welding shall not be measured, its cost being included in the rate of reinforcement.

Where tack welding is used in lieu of binding, such welds shall not be measured. Chairs separators etc. shall be provided as directed by the Engineer-in-Charge and measured separately and paid for.

Cross Sections Area and Mass of Steel Bar

Nominal Size mm Cross sectional Area Sq.mm Mass per metre Run Kg.

6 28.3 0.222

8 50.3 0.395

10 78.6 0.617

12 113.1 0.888

16 201.2 1.58

20 314.3 2.47

25 491.1 3.85

28 615.8 4.83

32 804.6 6.31

2.4 Rate

The rate for reinforcement shall include the cost of labour and materials required for all operations described above such as cleaning of reinforcement bars, straightening, cutting, hooking bending, binding, placing in position etc. as required or directed including tack welding on crossing of bars in lieu of binding with wires.

2.5 CONCRETING

Concrete Mix Proportioning

Design mix concrete is preferred to nominal mix. If design mix concrete cannot be used for any reason on the work for grades of M20 or lower, nominal mixes may be used with the permission of Engineer-in-Charge

Nominal Mix Concrete:

The proportions of materials for nominal mix concrete shall be in accordance with given table

Volume batching may be allowed only where weigh-batching is not practicable and provided accurate used in concrete have earlier been established. Allowance for bulking shall be made in accordance with IS 2386 (Part 3). The mass volume relationship should be checked as frequently as necessary, the frequency for the given job being determined by Engineer-in-Charge to ensure that the specified grading is maintained.

It is important to maintain the water cement ratio constant at its correct value. To this end, determination of moisture contents in both fine and coarse aggregates shall be made as frequently as possible, the frequency for a given job being determined by the Engineer-in-Charge according to weather conditions.

Concrete shall be mixed in mechanical batch type concrete mixers conforming to IS 1791. The mixer shall be tested under normal working conditions in accordance with the method specified in IS 4643 with a view to check its ability to mix the ingredients to obtain concrete having uniformity within the prescribed limits.

The percentage variation between the quantities of cement, fine aggregate and coarse aggregates (as found by weighing in water) in the two halves of a batch and average of the two halve of the batch shall not be more than the following limits:

Cement 8% Fine aggregate 6% Coarse aggregate 5%

The mixing machine drum shall be emptied before recharging. When the mixer is closed down for the day or at any time exceeding 20 minutes, the drum shall be flushed cleaned with water.

The concrete shall be deposited as nearly as practicable in its final position to avoid rehandling.

Concrete shall be thoroughly compacted and fully worked around embedded fixtures and into corners of the form work. Compaction shall be done by mechanical vibrator of appropriate type till a dense concrete is obtained. Compaction shall be completed before the initial setting starts

Exposed surfaces of concrete shall be kept continuously in a damp or wet condition by ponding or by covering with a layer of sacking, canvas or similar materials and kept constantly wet for at least 7 days from the date of placing concrete in case of ordinary Portland cement

Shuttering used shall be of sufficient stiffness to avoid excessive deflection and joints shall be tightly butted to avoid leakage of slurry.

Concreting shall be commenced only after Engineer-in-Charge has inspected the centering, shuttering and reinforcement as placed and passed the same. Shuttering shall be clean and free from all shavings, saw dust, pieces of wood, or other foreign material and surfaces shall be treated by heavy mineral oil or purified cylinder oil containing not less than 5% pentachlorophenol conforming to IS 716 well mixed to a viscosity of 70-80 centipoises.

During cold weather, concreting shall not be done when the temperature falls below 4.50ºC. The concrete placed shall be protected against frost by suitable covering. Concrete damaged by frost shall be removed and work redone.

During hot weather precaution shall be taken to see that the temperature of wet concrete does not exceed 38ºC. No concrete shall be laid within half an hour of the closing time of the day, unless permitted by the Engineer-in-Charge.

It is necessary that the time between mixing and placing of concrete shall not exceed 30 minutes so that the initial setting process is not interfered with.

3 Steel Work

3.1 STEEL WORK IN SINGLE SECTION FIXED INDEPENDENTLY WITH CONNECTING PLATE

3.1.1 Fabrication

The steel sections cut ends exposed to view shall be finished smooth. No two pieces shall be welded or otherwise jointed to make up the required length of member.

All straightening and shaping to form, shall be done by pressure. Bending or cutting shall be carried out in such a manner as not to impair the strength of the metal.

3.1.2 Painting

All surfaces which are to be painted, oiled or otherwise treated shall be dry and thoroughly cleaned to remove all loose scale and loose rust.

A priming coat of approved steel primer such as Red Oxide/Zinc Chromate primer conforming to IS 2074 shall be applied before any member of steel structure are placed in position or taken out of workshop.

3.1.3 Erection

Steel work shall be hoisted and placed in position carefully without any damage to itself and other building work and injury to workmen. Where necessary mechanical appliances such as lifting tackle winch etc. shall be used.

3.1.4 Measurements

The work as fixed in place shall be measured in running metres correct to a millimetre and weights calculated on the basis of standard tables correct to the nearest kilogram. The standard weight of steel sections shall conform to IS 808 with tolerance in sizes as per IS 1852. Tolerance in weight is given in Table below. Steel sections shall be acceptable within tolerance limits. Payment for steel sections shall be made as per actual weight within tolerances. Sections having weight on higher side than permissible tolerance, may be acceptable but payment shall be made on the basis of standard weight only. Steel sections having weight variations lower side than permissible variation shall not be acceptable.

3.1.5 Rate

Rate includes the cost of labour and materials required for all the operations described above.

3.2 STEEL WORK IN BUILT UP SECTIONS (RIVETED AND BOLTED)

The steel work in built up section (Riveted and bolted) such as trusses, framed work etc. is specified in this clause.

3.2.1 Laying Out

A figure of the steel structure to be fabricated shall be drawn on a level platform to full scale. Steel tape shall be used for measurements.

3.2.2 Fabrication

Fabrication shall generally be done as specified in IS 800.

3.2.3 Making Holes

Holes through more than one thickness of materials for members, such as compound stanchion and girder flanges shall, where possible, be drilled after the members are assembled and tightly clamped or bolted together. Punching may be permitted before assembly, provided the holes are punched 3mm less in diameter than the required size and reamed after assembly to the full diameter. The thickness of material punched shall be not greater than 16 mm.

3.2.4 Assembly

Before making holes in individual members, for fabrication and steel work intended to be riveted or bolted together shall be assembled and clamped properly and tightly so as to ensure close abutting, or lapping of the surfaces of the different members.

3.2.5 Bolting

The nominal length of the bolt shall be the distance from the underside of the head to the further end of the shank. All bolts heads and nuts shall be hexagonal unless specified otherwise. The screwed threads shall conform to IS 1363 and the threaded surface shall not be tapered.

3.2.6 Erection

Fabricated members shall be lifted at such points so as to avoid deformation or excessive stress in members.

Trusses shall be lifted only at nodes. The trusses above 10 m in span shall not be lifted by slinging at two mid points of rafters, which shall be temporary braced by a wooden member of a suitable section. After the trusses are placed in position, purlins and wind bracings shall be fixed as soon as possible.

3.3 STEEL WORK IN BUILT UP SECTION (WELDED)

3.3.1 Welding

Welding shall generally be done by electric arc process as per IS 816 and IS 823.The electric arc method is usually adopted and is economical.Gas welding shall not be permitted for structural steel work as it required heating of the members to be welded along with the welding rod and is likely to create temperature stresses in the welded members.

As far as possible every efforts shall be made to limit the welding that must be done after the structure is erected so as to avoid the improper welding that is likely to be done due to heights and difficult positions on scaffolding etc. apart from the aspect of economy.