SANS 10120-3 DB-1982 Code of practice for use with standardized specifications for civil engineering construction and contract documents Part 3 Guidance for design Section DB Earth.pdf
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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. Clause PART 3 : GUIDANCE FOR DESICN SECTION UB CONTENTS SABS 0120 : Part 3 Section DB-1982 Earthworks (pipe trenches) (As amuiiticcl 1081) PRE-TENDER CON
4、SIDERATIONS . 1 . Investigations 1 . Preparation of trench bottom 1 . Administration 1 . Riqht to use ground throughout route of pipeline 1 Minimum width of servitudes/wayleaves 1 Site clearance and the reinstatement of lawns. gardens. etc l Backfilling 011 private property 1 Tenders 1 Documentation
5、 1 . Pipeline servitudes or wayleaves l Acconwodation of traffic . 2 . Disposal of surplus and unsuitable material 2 Methods of excavation. bedding. and backfilling 2 Other project specification requirements . 2 DESIGN REQUIREMENTS 2 Trench Widths 2 Maximum width 2 Minimum width 2 . Cover over Pipes
6、 2 APPLICABILITY OP OTHER CODES . 2 TEST PROCEDIJRES . 2 General 2 QUALITY CONTROL AND OTHER CONSIDERATIONS . 2 Lessons from Design Failures 2 Trench depths and structural design of buried pipelines 2 SABS 0120 : Part 3 Section DB-1982 Earthworks (pipe trenches) Amendment No. 1 : 27 February 1989 SA
7、BS 1200 DB : EARTHWORKS (PIPE TRENCHES) NOTE: The clause number(s) given at the beginning or after the heading of a clause is/are, unless otherwise stated, the number(s1 of the relevant clause(s) of SARS 1200 DD. PGE-TENDER CONSIDERATIONS INVESTIGATIONS Preparation of Trench Bottom (Subclause 5.5).
8、Where the preliminary investigations reveal a risk of difficult conditions at the bottom of a trench in any section of the work, ensure that sufficient items have been scheduled, on a provisional basis, to deal with situations that are likely to occur. The design engineers attention is drawn to the
9、following main types of situations that may arise: a) Where the trench bottom is coarse-grained, and reasonably dry, and variations in bearing qualities are insignificant, or where the bottom is fine-grained but dry, no prohlems are likely to atise and bedding can be constructed as specified. b) Whe
10、re water is present the contractor is responsible, in terms of Subclause 5.1.2.1 of SABS 1200 DB, for ensuring (by the sloping of the bottom, the provision of a channel on one side and the draining of water to low points, or the removal of water by pumping) that the bottom of the trench is always fr
11、ee from standing water. Where this has been achieved or is practicable, conditions on the trench hottom should be such that the situation given in (a) above is applicab3e. C) Where the steps outlined in (h) above are impracticable because ot the sloppy nature of the material in the bottom of the tre
12、nch, it will be necessary to stabilize the trench bottom and to avoid disturbance and further softening of the trench bottom. This situation will arise in wet fine-grained soils snch as soft clays, silts, and fine sands. Suitable granular material, crushed stone, crusher-run, or ash should be placed
13、 as necessary on the trench bottom immediately the excavation has been completed. Such a layer should become effective before its thickness exceeds 200 mm. Where such steps are inadequate, a concrete raft should be constructed on top of the stabilizing layer. Where the condition of the soil to a dep
14、th exceedinq 600 mm below the pipe invert level is poor, piles may be necessary to suppurt a reintorced concrete raft constructed on the bottom of the trench. Normal bedding as described in (a) above should be constructed on top of the concrete. Attention is drawn to Subclause 3.1.4 of Section DB of
15、 Part 5 of the code, where further aspects of the problem are outlined. Right to Use Ground ThroughoutRoute of Pipeline (Subclause 5.3). Ensure that the employer has the necessary authority to use the ground or wayleaves or servitudes over the whole of the route of the pipeline before tenders are in
16、vited. This is necessary to enable the contractor to carry out, in the most economical sequence, permanent works on property belonging to others from the date of award of the contract without let or hindrance. (See also Subclause 1.2.1 of Section D.) Minimum Width of Servitudes/Wayleaves (Subclause
17、5.3). Ensure that the servitude obtained for the works is wide enough to allow normal working conditions (bearing in wind the depth to invert of the pipe) both during construction of the pieline and during subsequent repair and maintenance work. Where this is not possible, negotiate temporary occupa
18、ncy of adjoining land (such occupancy being probably also of advantage to the employer). Alternatively, it may he possible to deal with the matter by way of a provision in the project specification such as that in Subclause PSDB 4.1 gjven in Subclause 3.2.5.2 of Section DH of Part 2 of the code. Sit
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