sabs 1200 lg

UDC 624 (083.75)

Approved by t h e COUNCIL OF THE SOUTH AFRICAN BUREAU OF STANDARDS on 8 J u n e 1983

SPEC 1200 LG-1983

SOUTH AFRICAN BUREAU OF STANDARDS

STANDARDIZED SPECIFICATION

€ o r

C I V I L ENGINEERJNG CONSTRUCTION

LG : PIPE J A C K I N G

Obtainable from t h e SA BUREAU OF STANDARDS P r i v a t e Bay X191 P r e t o r i a 0001 Republic of South Africa

Telegrams : Comparator, P r e t o r i a

P u b l i s h e d and p r i n t e d i n t h e Republic of South Africa by t h e South A f r i c a n Bureau of Standards

Gr 5

3

CONTENTS

SABS 1200 LG-19R3 Pipe jacking

Clause

1 . 2 . 2.1 2.2 2.3

3.1 3.2

4.1 4.2 4.3 4.4

5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.2 5.2.1 5.2.2 5.2.3 5.2.4 5.2.5 5.3 5.4 5.4.1 5.4.2 5.4.3 5.5 5.5.1 5.5.2 5.5.3 5.6 5.7 5.8

6.1 6.2 6.3

3 . 4 .

5 .

6 .

7 . 8 . 8.1 8.2

APPENDIX A .

Page Number

SCOPE ............................................................................... 5 INTERPRETATIONS ..................................................................... 5 supporting Specifications ........................................................... 5 Application ......................................................................... 5 Definitions ......................................................................... 5 MATERIALS ........................................................................... 5 Pipes ............................................................................... 5 Intermediate Jacking Stations ....................................................... 5 PLANT ............................................................................... 5

Jacks ............................................................................... 5 General ............................................................................. 5

Shield .............................................................................. 5 Lighting ............................................................................ 5 CONSTRUCTION ........................................................................ 6 General ............................................................................. 6

Design calculations by contractor ................................................... Contractor solelv responsible ....................................................... 6

Authority to jack pipeline under facilities controlled by third parties ............. 6 Competence .......................................................................... 6

6

Safety Control Requirements .. Jacking not to impair safety . Examination of structures at r Recording of movements ....... Temporary supports ........... Restriction on blasting ...... Sleeve Pipes .................

...................................................... 6 ...................................................... 6 sk ................................................... 6 ...................................................... 6 ...................................................... 6 ...................................................... 6 ...................................................... 6

Excavation .......................................................................... 6 General ............................................................................. 6 Thrust pit .......................................................................... 6

Jacking Procedure ................................................................... 7

Lubrication of structure during jacking ............................................. 7

Jacking of pipeline ................................................................. 6

Procedure ........................................................................... 7

Thrust and reception pits ................. Grouting and Plugging ..................... AS-Built Drawings ......................... Backfilling and Disposal of Excavated Mater

TOLERANCES ................................ General ................................... Permissible Deviations ....................

......................................... 7 a1 ...................................... 7 ......................................... 7 ......................................... 7 ......................................... 7 ......................................... 7 ......................................... 7 - Checking Alignment .................................................................. 1

MEASUREMENT AND PAYMENT ............................................................. 8 Principles .......................................................................... 8 Scheduled Items ..................................................................... 8

APPLICABLE STANDARDS .................................................................. 10

TESTING ............................................................................. 7

5 SABS 1200 LG-1993 Pipe jacking

SOUTH AFRICAN BUREAU OF STANDARDS STANDARDIZED SPECIFICATION

CIVIL ENGINEERING CONSTRUCTION for

LG : PIPE JACKING

1. 1.1

2. 2.1

2.2

2.3

3. 3.1

3.2

4 4.1

4.2

4.3

4.4

SCOPE This specification covers the insertion, by jacking, of pipelines of diameter not exceeding 3 m under roads, railways, and the like without disturbing the surface or interfering with the normal flow of traffic. NOTE: The standards referred to in the specification are listed in Appendix A.

INTERPRETATIONS SUPPORTING SPECIFICATIONS. Where this specification is required for a project, the following specifications shall, inter alia, form part of the contract document: a) Project specification; b) SABS 1200 A or SABS 1200 AA, as applicable; c) SABS 1200 D or SABS 1200 DA, as applicable; d) SABS 1200 DB; e) SABS 1200 G or SABS 1200 GA, as applicable; f) SABS 1200 L; g) SABS 1200 LE.

APPLICATION. Interpretations and variations of this specification are set out in Portion 2 of the project specification which precedes this specification in a contract document.

DEFINITIONS. applicable of the specifications listed in 2.1 and the following definitions shall apply: Intermediate jacking station. A transverse joint in a jacking structure at which jacking is performed. Jacking. Jacking frame. transmitted. Jacking structure. shield. Lead pipe. intended to be the first pipe to be used in the jacking process. Reception pit. An excavated shaft that is located at the end of a jacked section of a pipeline and from which the shield is recovered. Shield. A device that is located at the leading end of the jacking structure and is intended to provide protection for workmen at the leading end, and to prevent collapse of the face of the tunnel excavation. Thrust pit. jacking structure and other equipment are installed and from which the jacking operations are carried out. Thrust plate. A steel plate that is placed against the end of the concrete pipe against which the jack operates and that is intended to ensure that the jacking forces are spread over the end face of the pipe.

MATERIALS PIPES. that comply with the relevant requirements of SABS 677, and shall be sealed. The actual diameters of pipes supplied shall be not less than the nominal diameters given on the drawings or stated in the schedule. In addition to withstanding the specified two (or three) edge-bearing test load, the pipes shall be capable of Withstanding, without damage, the maximum longitudinal force to be transmitted by the Contractor's jacks during jacking.

INTERMEDIATE JACKING STATIONS. diate jackinq station within a single jacked length between the thrust and reception pits. Such a station shall consist of a pair of modified jacking pipes. In order to protect and form the joint between these pipes, the Contractor shall provide cylindrical mild steel sleeves of wall thickness at least 8 nun and of such length that they overlap the pipes for a distance of at least 150 nun on either side of the joint,

PLANT GENERAL. position for jacking, for jacking the pipes, for the lubrication of the outer surface of the pipeline, and for excavation within the pipe.

JACKS. and such that the actual jacking forces can be read at any time during the jacking operation. To transfer the load from the jacks to the pipes, suitable thrust plates shall be provided for placing against the ends of the pipes.

SHIELD. A suitable shield for fitting to the front of the lead pipe shall be provided by the Contractor to protect workmen and prevent collapse of the face or roof of the excavation ahead of the jacked structure.

LIGHTING.

This specification contains clauses that are of general application to pipe jacking.

For the purposes of this specification the definitions and abbreviations given in the

The action of pushing a pipeline into position. A frame on which the jacks are mounted and through which the jacking forces are

An assembly comprising the jacking frame, the permanent pipes being jacked, and the

A pipe that has a rebated end over which the trailing end of the shield is fitted and that is

An excavated shaft at the commencement point of a jacked section of a pipeline, in which the

Pipes for jacking shall be reinforced concrete pipes of the SC type and D-load designation lOOD

Under certain circumstances it may be necessary to provide an interme-

The Contractor shall provide and use suitable equipment for handling pipes and placing them in

Each set of jacks shall be fitted with a suitably calibrated pressure gauge in good working order

The shield shall be directionally adjustable.

The Contractor shall provide adequate lighting for the execution of the Works.

SADS 1200 LG-1983 Pipe jacking

6

5. 5.1 5.1.1

5.1.2

5.1.3

5.1.4

5.2 5.2.1

5.2.2

5.2.3 5.2.3.1

5.2.3.2

5.2.4

5.2.5

5.3

5.4 5.4.1

5.4.2

5.4.3 5.4.3.1

CONSTRUCTION GENERAL Authority to Jack Pipelineunder Facilities Controlled by Third Parties. Except where otherwise rrquiied in terms of the project specification, the Engineer will obtain prior permission from any third party who controls the land or any structure on the land (or both) under the surface of which the pipeline is to be jacked. observed before and during jacking operations. Competence. with this work. Design Calculations by Contractor. calculations, specifications, and working drawings to show his methods of installation and methods of providing temporary support for the road, rail track, or other service or structure and any modifications to structures required before pipe jacking commences. The design shall be carried out by a civil engineer with adequate experience in this field. Calculations, specifications, and drawings shall be signed by the engineer responsible for their preparation. The Contractor shall not commence any work shown on the said drawings or specified in the said specifications until the Engineer has signified in writing that the Contractor may proceed. Contractor Solely Responsible. Any permission to proceed given in terms of 5.1.3 or otherwise shall not indicate acceptance by the Employer or the Engineer of any responsibility for safety or adequacy of jacking structures arid methods of working and, in terms of Subclause 2.5 of SABS 1200 A or SABS 1200 AA, as applicable, shall not limit the obligations and liabilities of the Contractor in regard to such safety or adequacy.

He will also specify the said third party's requirements for warnings and procedures to be

Jacking and excavation shall be supervised and undertaken only by persons fully conversant

The Contractor shall, when so ordered, furnish detailed design

SAFETY CONTROL RRQUIREMENTS Jacking'not to Impair Safety. service or structure, as applicable, without disrupting traffic and without disturbing the alignment or levels of the road surface, the tracks, or other service or structure, as applicable, to an extent that may impair the safety of traffic or of the service or structure. Examination of Structures at Risk. Before commencing work in the vicinity of any structure, the Contractor shall make a detailed examination of the structure, record its condition, and submit a copy of such record to the Engineer.

The pipeline shall be jacked through under the road, railway, or other

Recording of Movement reneral. The Contractor shall take measurements before and after the construction period and shall record any change in line or level (or both) of any road, rail track, or other service or structure being traversed. Working under roadways. the road surface directly over the jacking line and for a distance of at least 5 m on each side of the jacking line. markings. measured 300 mm from the edges of the surfacing. Where the road has paved side drains, levels shall also be measured in the invert of the drains. In order to facilitate control of the measuring of levels, the exact position of each spot height shall be discreetly marked on the road surface before the levels are measured. After completion of the Works, the Contractor shall remeasure the levels in the same manner as before, and he shall submit to the Engineer the records of levels taken before and after jacking. of such records shall be a prerequisite for any consideration by the Engineer of the acceptability or otherwise of the Works or the issue of any certificate of completion. If, within a period of one year after completion of the Works, the road shows any sign of settlement in the vicinity of the jacked pipe, the road authority may remeasure levels on the Site. The Contractor shall be held responsible for the rectification, to the satisfaction of the road authority, of any deformation that occurs in the road surface in the vicinity of the jacked pipe during the said period of one year. Temporary Supports. Except when such support is provided by others, the Contractor shall provide such temporary support as is necessary to carry road and rail traffic, and in the case of railway tracks, to prevent horizontal or vertical misalignment. Restriction on Blasting. Engineer, and without the necessary approval or clearance being obtained from the relevant authority.

SLEEVE PIPES. Pipes intended as sleeve pipes shall be laid with the inside walls smooth and free from projections and sharp edges.

A copy of such record shall be made available to the Engineer. Before commencing work under a roadway, the Contractor shall measure levels on

These levels shall be measured at 500 mm intervals along each line of the road paint In cases where the road has no painted shoulder markings, the shoulder levels shall be

The submission

No blasting shall be carried out without the prior written permission of the

EXCAVATION General. Subject to the provisions of 5.2.5, the requirements of SABS 1200 D or SABS 1200 DA, as applicable, shall apply. Thrust Pit. end of the section of pipeline or sleeve that is to be jacked. These pits shall be of dimensions at least equal to the minimum dimensions needed for the Contractor's equipment and for safe and efficient working. The approximate dimensions of the pits that the Contractor intends to excavate shall be agreed upon with the Engineer before work commences. backfilling. The sides of the pits shall be adequately supported by timbers or other approved means. Where a pit adjoins a railway or a heavily used road, the sides of the pit shall be shored during the entire operation to prevent any movement caused by vibration arising from rail or road traffic. (The Con- tractor's attention is drawn to the requirements of the Factories, Machinery and Building Work Act, 1941 (Act 22 of 1941) The Contractor shall ensure that, at all times, each pit is provided with barriers and is a safe place within which to work.

The Contractor shall be responsible for excavation of the thrust and reception pits at each

The excavated material shall be stockpiled for later

(see Subclause 5.1 of SABS 1200 D or SABS 1200 DA, as applicable).)

Jacking of Pipeline General. Excavation shall be such that overbreak is kept to a minimum. advance of the leading edge where the leading edge is in unstable or loose material.

No material shall be removed in If the material at

the face starts to slip or run (see 5.4.3.2(c), excavation shall be stopped immediately and the Contractor shall take such action as is necessary to stabilize the material before excavation is resumed.


5.4.3.2

5.4.3.3

5.4.3.4 5.4.3.5

5 . 5 5.5.1

5.5.2

5.5.3

5.6

5.1

5.8

6. 6.1

6.2

6.3

1 .

7.1

Prevention of subsidence during jacking a) To ensure that overbreak is kept to a minimum, the Contractor shall ensure that the first concrete PiDe used is so rebated that there is no substantial difference between the outside diameters of the * _

shield and the pipeline. b) The Contractor shall ensure that excavations within the pipe are under continuous expert supervision such that conditions at the front of the shield are always safe. c) The Contractor shall take every reasonable precaution to ensure that no slips or runs develop at the face such as will endanger personnel or cause cavities beyond the circumference of the lead pipe. d) If necessary, the Contractor shall make provision for suitable de-watering of the material in the vicinity of the leading edge of the pipe. e ) Should any cavity occur around the outside of a pipe during the jacking process, such cavity shall be filled immediately by the injection of suitable approved process grout through holes drilled in the pipe walls. f) Any subsidence occurring above the jacked pipe and arising from any cause related to jacking operations shall be made good to the.satisfaction of the Engineer and at the Contractor's expense. Standard procedure. the face and boarded up where necessary. Drainage. Jetting.

JACKING PROCEDURE Procedure. bear(s) against a suitable thrust plate so that the thrust of the jack(s) is distributed adequately over the end face of the pipe. The rear end oE each jack shall bear against a suitably designed structure such that the force is transferred to the surrounding material and evenly distributed over an area sufficient to ensure that the bearing capacity of the soil is not exceeded and that no structure in the vicinity of the thrust pit is disturbed.

At the conclusion of each day's work the pipeline being jacked shall be jacked up to

The Contractor shall ensure that the head of each excavation is drained at all times. Under no circumstances will jetting be permitted.

Each pipe shall be advanced by means of one or more hydraulic jacks of adequate capacity that

Lubrication of Structure During Jacking. The Contractor may, with the written permission of the Engineer, inject a suitable lubricant through preformed holes in the structure or at the cutting edge of the shield. Thrust and Reception Pits. where manholes or junctions are required, as indicated on the drawings. sufficient size to allow jacking operations to be conducted with maximum efficiency.

BACKFILLING AND DISPOSAL OF EXCAVATED MATERIAL. and shield dismantled, the thrust and reception pits shall be backfilled to the extent necessary and in the manner indicated on the drawings or laid down in the project specification. Surplus excavated materials shall be disposed of as specified in the project specification.

GROUTING ANU PLUGGING. When the jacked pipeline is in its final position a stabilized sand/cement grout. shall be injected to fill all voids between the jacked pipeline and the surrounding material. The grout shall have a strength equal to or better than a grout consisting of one part cement and four parts sand and shall have a slump of 120 nun. All holes in the pipeline shall be sealed with an approved epoxy sealant.

AS-BUILT DRAWINGS. shown on the tender drawings has been modified to suit the jacking method, the Contractor shall, on completion of the work and before the final payment is made, supply to the Engineer transparencies showing details of the completed structure. to be an accurate reflection of the details of the work as constructed.

TOLERANCES GENERAL. Subject to any requirements of the project specification imposed because of the gradientfs) of the pipeline or the purpose for which it is required, the pipes shall be jacked into position within the tolerances yiven in 6.2. Should the difference between the actual and the specified position or alignment of the finished pipeline exceed the value of the said tolerance to an extent that additional costs are incurred in locating, installing, supporting, or maintaining any service that has been designed to be laid through the finished pipeline, the Contractor shall bear such additional costs provided that the details of the work to be done to relocate, install, or support the said service, and the order for the work to be done (by the Contractor or by others) have been given by the Engineer within 30 working days after the completion of the jacking operation.

PERMISSIBLE DEVIATIONS. horizontally and 50 mm vertically of the designed position. be gradual and the pipe manufacturer's stated maximum permissible draw or angular deflection shall not be exceeded at any point. Misalignment between pipe units shall not exceed 10 mm.

CHECKING ALIGNMENT. The Contractor shall check line and level at least once during the installation of each pipe length, and he shall take such corrective action as is necessary. A copy of the results of all checks and a statement of any corrective measures taken shall be available for inspection on the Site, and a copy shall be given to the Engineer as soon as the jacking has been completed.

TESTING Except as required for the purposes of testing the pipes to be jacked (see 3.1) and to assess compliance with the relevant requirements of SABS 677, and except for any hydraulic tests specified elsewhere in the contract, no tests are required on the completed pipeline.

Thrust arid reception pits will in general be permitted only at positions Thrust pits shall be of

When jacking has been completed and the jacking frame

If an alternative design by the Contractor has been accepted or if the structure

Each such transparency shall be certified by the Contractor

The position of any point of the finished pipeline shall be within 100 mm Adjustment to line or level, or both, shall

SABS 1200 LG-1983 Pipe jacking

8

8. 8.1 8.1.1

8.1.2 8.1.2.1

8.1.2.2

8.1.3

8.1.4

8.2 8.2.1

8.2.2

8.2.3

8.2.4

MEASUREMENT AND PAYMENT PRINCIPLES General. Engineer may design and specify the pipeline, he cannot provide detailed drawings and dimensions for the jacking structure and its thrust and reception pits, because these depend on equipment and methods that the Contractor intends to use for carrying out the work. In order to establish a basis on which to negotiate the price of the actual jacking structure, the Engineer may schedule provisionally the dimensions of the thrust and reception pits or he may require the Contractor to state in the schedule the dimensions of the pits for which his price makes provision. In view of the considerations set out above and the nature of the operations, the provision and insertion of a jacked pipeline may be scheduled a) as a lump sum with a requirement that the Contractor provide a priced schedule for use as a basis for interim payments (see 8.1.31, or b) in detail, as specified in 8.2.

The basis of payment for a jacked pipeline takes cognizance of the fact that, although the --

Items for Pipe Jacking All items listed in the section or subsection of the schedule of quantities for pipe jacking will be applicable to all operations between the start of jacking in the thrust pit to the end of the operation in the reception pit (see 5.4.2) in respect of each length of pipeline to be jacked. Except as provided for in 8.1.3, all such items will be measured and paid for in terms of 8.2. Except as provided for in 8.1.3, all opdrations on the Works up to the start of operations in the thrust pit, and after the end of jacking operations in the reception pit will be measured and paid for in terms of the requirements of the relevant of the specifications referred to in 2.1. - Contractor's Priced Schedule. Where the Contractor is responsible for the complete design of the jacking structure and of the jacked pipeline (see 5.1.3) and has submitted a sum or a priced schedule, such sum or priced schedule shall provide for all jacking operations as well as for any part of any associated structure (temporary or permanent) designed by him. shall cover the cost of a) the design and the preparation of all drawings; b) all labour, plant, tools, equipment, materials, transport, consumable stores, services, samples, temporary excavations, and everything of a temporary or permanent nature required to carry out the work; c) any modifications to the structures to suit the proposed method of jacking. The quantities shown in the Contractor's priced schedule will be regarded as fixed and will not be remeasured. "Cut and Cover" (Alternative to Pipe Jacking). Where the schedule provides for alternative methods of constructing a length of pipeline, the items scheduled for the "cut and cover" method will be subject to the terms of Clause 8 of SABS 1200 D or SABS 1200 DA, as applicable, and of Clause 8 of SABS 1200 DB, and items scheduled for the pipe jacking method will be measured in terms of 8.1.2 and 8.2.

SCHEDULED ITEMS Jacking Establishment (a) Fixed charges ...................................................................... Unit: Sum (b) Time-related charges (period to be stated by the Contractor) ....................... Unit: Sum The Contractor shall state the period required for the complete jacking operation from the start of excavation of the thrust pit to the end of the removal of the temporary works, reinstatement of surfaces, and making good. The terms of Subclause 8.4.2.2(h) of S h B S 1200 A or Subclause 8.4.2 of SABS 1200 AA, as applicable, shall apply. The sums for (a) and (b) above shall cover respectively the fixed and time-related charges, as applicable, for providing and establishing on Site the thrust and reception pits together with all plant, equipment, and materials necessary for the handling and jacking of pipes, all additional excavation, backfill, and reinstatement of paved and other surfaces, railway tracks, etc., shoring, bracing, lighting, watching, de-watering, and maintaining of all temporary works until the Works are completed, and the subsequent removal of temporary works, and making good. In respect of (a) above, notwithstanding the terms of Subclause 8.2.1 of SABS 1200 A or SABS 1200 AA, as applicable, payment of 80 % of the sum will be made on completion of the jacking establishment and, on making good after its removal, the balance of 20 %. In respect of (b) above, the terms of Subclause 8.2.2 of SABS 1200 A or SABS 1200 AA, as applicable, shall apply. Supply of Pipes to be Jacked (type, designation, diameters, and overall length to be jacked will be stated) ............................................................................. Unit: m Each jacked pipeline will be measured between ends of the completed pipeline, will be measured continuously through intermediate jacking stations, and will include intermediate jacking pipes. The rate shall cover the cost of supplying selected pipes with grouting holes, delivering, handling, and storing of pipes, rubber rings, packing pieces, and flexible sealing to joints between intermediate jacking pipes. Jacking of Pipes (type, designation, diameters, and overall length to be jacked will be stated) ................................................................................ Unit: m The rate shall cover the cost of the handling and positioning of the pipes, the jacks, and subsidiary materials, the labour necessary for jacking the pipes through all materials foreseen in the project specification or as scheduled, sealing grouting holes in the pipe barrels, bentonite injection (if necessary), intermediate jacking pipes and ancillary jacking equipment (or, alternatively, intermediate jacking stations, in which case the rate shall cover the construction of junction boxes as closures between pipe ends). The construction of junction boxes at intermediate jacking stations will not be measured and paid for separately unless they are specifically ordered by the Engineer or shown on the drawings for branch connections.

Excavation for jacking will be measured in the in-situ condition calculated from the length of pipe jacked in terms of 8.2.2 and 8.2.3, and the external diameter of the jacked pipe. Additional volumes excavated for the thrust and the reception pits will not be measured for payment under this item (see 8.2.1).

Such a sum or the rates in such a priced schedule

3 Excavation for Jacking (class of material stated) ...................................... Unit: m


The rate shall cover the cost of digging at the face through all materials foreseen in the project specification or as scheduled, transporting excavated material through the pipe, lifting to ground level, loading and dumping the material within 0,5 km from the thrust pit (distance to be measured radially), ventilation, de-watering, and lighting within the pipe. Overhaul beyond the 0,5 km freehaul distance will be measured and paid for in terms of Subclause 8 . 3 . 6 of SABS 1200 D or Subclause 8.3.3 of SABS 1200 DA, as applicable.

The sum will be stated by the Engineer and will be an amount to cover the direct extra cost of all operations specified in 8.2.4 for removing the particular rock or boulder(s), and the cost of delays and disruption of the pipe jacking operation, as determined from 8.2.l(b).

Supply and Install Pipes by Pipe Jacking Method, Complete with Excavations (type, designation, diameters, etc. stated) ........................................................................... Unit: m The rate shall cover the cost of the activities specified in 8.2.2, 6.2.3, and 8.2.4 for a pipeline of any length up to 85 m, including excavation in all materials except rock. =-Over 8.2.6 for Lengths of Pipeline greater than 85 m ............................. Unit: The rate shall cover the additional costs of the activities specified in 8.2.6 for a pipeline of length greater than 85 m.

a) using pneumatic tools or other techniques where blasting is not permitted Unit: in b) using explosives, where permitted ................................................... Unit: m The rates for (a) and (b) above shall cover the extra cost of all operations as specified in 8.2.5.

8.2.9 Stabilization of Unstable Areas or Grouting of Voids where Ordered ................. Units: as set out below a) Provision and establishment of equipment on Site, and removal on completion of operation .............................................................................. Unit: Sum b) Operation of equipment .............................................................. Unit: Day c ) Materials used ............................................................... Unit: Dayworks or m3 or kg Except that the rate for (b) above shall also cover the cost of delays and disruption of the pipe jacking operation, the sums or rates, as applicable, for (a), (b), and (c) above shall comply with the relevant requirements of Clause 8 of SABS 1200 A or SABS 1200 AA, as applicable.

The item is applicable only under circumstances that are, in the opinion of the Engineer, outside the control of the Contractor. The time paid for under this item will apply in the areas and to the ordinary hours worked in terms of the applicable wage determination made in terms of the Wage Act, 1957 (Act 5 of 1957) I). The rate shall cover the cost of all delays to and disruption of the pipe jacking operation.

8.2.5 Extra-Over 8.2.1 and 8.2.4 for Unforeseen Rock or Boulder(s) (Provisional) ............. Unit: Stated Sum

8.2.6 NOTE: This item together with 8.2.7 and 8.2.8 are alternatives to 8.2.2-8.2.5.

8.2.7 m

3 3

8.2.8 Extra-Over 8.2.6 for Excavation in Rock ...........

8.2.10 Standing Time for Pipe Jacking Gang and the Jacking Equipment Covered by 8.2.1 ......... Unit: hour

1) wage determinations are published from time to time in the Government Gazette. (See Government Gazette No. 7941 of 27 November 1981.)

SABS 1200 LG-1983 Pipe jacking

10

APPENDIX A. APPLICABLE STANDARDS

Reference is made to the latest issues of the following standards:

SABS 677 SABS 1200 A SABS 1200 AA SABS 1200 D SABS 1200 DA SABS 1200 DB SABS 1200 G SABS 1200 GA SABS 1200 L SABS 1200 LB

mbs pta

Concrete non-pressure pipes Civil engineering construction: General Civil engineering construction: General (small works) Civil engineering construction: Earthworks Civil engineering construction: Earthworks (small works) Civil engineering construction: Earthworks (pipe trenches) Civil engineering construction: Concrete (structural1 Civil engineering construction: Concrete (small works) Civil engineering construction: Medium-pressure pipelines Civil engineering construction: Bedding (pipes)

ISBN 0-626-06490-2

sabs 1200 lg

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