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 StlBS 0120 : Part 2 Section LG-1933 Pipe jacking PART 2 : PROJECT SPECIFICATlON SECTION LG CONTENTS Page Number ESSENTIAL PROJECT SPECIFICATION CL
4、AUSES . 1 ESSENTIAL DATA 1 ADDITIONAL CLAUSES . 1 General 1 Normal Projccts l Pipe jacking under roads, railways, or other facilities cortrolled by third parties . 1 Jacking of pipelines under South African Transport Services tracks 1 Continuous jacking 2 Tolerances 2 June 1383 Approved by the COUNC
5、IL OF Till: SOUTll APIUCAN BUREAU OF STANDARDS 1 SABS 1200 LG : PIPE JACKING SABS 0120 : Part 2 Section LG-1983 pipe jacking NOTE a) Number PSLG clauses in Portion 2 of the project specification in the sequence in which the clauses to which they relate appear in SABS 1200 LG. b) The clause number(s)
6、 given at the beginning or after the heading of a clause is/are, unless otherwise stated, the number(s) of the relevant clause(s) of SABS 1200 LG. ESSENTIAL PROJECT SPECIFICATION CLAUSES Set out suitable clauses in Portion 2 of the project specification to provide essential information as follows :
7、a) (Subclause 5.1.1) Set out details of arrangements made with the controliing authority (see 3.2.1 and 3.2.2 below). b) (Subclause 5.6) 1) Where not given on the drawings, specify the extent and density of backfilling required. 2) Designate a disposal area for excavated material. c) (Subclauses 8.2
8、.4 and 8.2.5) Except where adequate data have been given in PS3 (Nature of ground and subsoil conditions) of Portion 1 of the project spccification, give a description of the materials through which the pipeline is to be jacked (see Subclause 1.1.2 of Section LG of Part 3 of the code). ESSENTIAL DAT
9、A The availability of certain essential data may affect the prices tendered. Except where such data have been given in the schedule or in the tender drawings, set out suitable clauses covering items such as the followirig in Portion 2 of the project specification: a) (Subclauses 5.1.3 and 5.8) State
10、 whether the contractor is to provide designs, etc. (See also (b) below. ) b) (Subclause 5.4.2) State whether provision must be made to deal with vibration arising from road or rail traffic or other sources. C) (Subclauses 6.1 and 6.2) State thc tolerances that wiil apply if other than those specifi
11、ed in SABS l200 LG (see 3.2.4 below) . cl) (Subclause 8.1.4) If applicable, identify lengths of pipeline over which “cut and cover“ construction will be accepted. ADDITIONAL CLAUSES GENERAL. Where it is necessary to amplify or otherwise to vary the terms of SABS 1200 LG to render them suitable for u
12、se in projects to be carried out in particular locations or under particular circumstances, include in Portion 2 of the project spccification clauses dealing with matters other than those covered by Clauses 1 and 2 above. (See also Subclause 1.3 of Section LG of Part 3 of the code.) NOTE: To meet re
13、quirements imposed by various norms of economic development, projects are classified as normal, prestige, subeconomic, and labour-based projects (see Clause 4 of Section 0 of Part 3 of the code) . Pipe Jacking under Roads, Railways, or ogher Facilities Controlled by Third Parties (subclauses 5.1.1 -
14、 and 5.2.3.2). In addition to a wayleave being arranged for any pipeline that is to pass across property .- - - owned by others, special authority-must be obtained for the jacking of the pipeline because of the need to investigate subsurface conditions, to locate other services buried in the area, a
15、nd to give notice of an unconventional method of construction that, while avoiding disruption of traffic and of the environ- mcnt, may involve a low risk. Some authorities require application to be made in a particular format but, regardless of the format, it is always necessary to request permissio
16、n and to give an outline (with drawings) of the proposed pipe jacking operation, and also to ask what requirements are to be met both before and during construction. As the details of such arrangements will have a considerable impact on the cost of the operation, it is necessary that those matters b
17、e dealt with before tenders are invited. Subclause 5.2.3.2 of SABS 1200 LG sets out the requirements of the Department of Transport, and may be used as a guide for pipe lacking under other facilities. Alternatively, where no other guidance is available, the requirements of the South African Transpor
18、t Services as set out in 3.2.2 below may be used as a guide. Jacking of Pipelines Under South African Transport Services Tracks (Subclause 5.1.1). Where a pipeline is to be jacked under South African Transport Services tracks, include a clause such as the following: PSLC 1. SOUTH AFRICAN TRANSPORT S
19、ERVICES PSLG 1.1 The right to instruct. The Contractors attention is directed specifically to the South African Transport Services (hereinafter referred to as “the SATS“) specification E 7 in terms of which no work whatsoever shall be carried out on, over, under, or adjacent to SATS property until t
20、he permission of the SATS has been obtained, and furthermore, the Contractor shall be bound by and shall observe the conditions imposed by the SATS in granting any such permission. SABS 0120 : Part 2 Section LG-1983 Pipe jacking Although the general superv+sion and control of the cortrnct liorka Erl
21、ls under the suthority of the Employer, the SATS reserves and shall have the right to instruct. the Contractor directly in any matter that has a direct hearing on the safety of rail traffic and the protection of the interests of the SAT5. PSLG 1.2 Crossmg bcneath SATS tracks PSLG 1.2.1 The Employer
22、will make applicaton to and obtaa.n from the SATS Administration, rchc wayleavc for the railway crossing. hc Contractor shall make his own arrangcmetits with the SATS, subject to the approvcl of the Engineer, and shall arrange his work to fit in with tlic rcquircments of the SATS. No interruption of
23、 train services will be permit.ted. PSLG 1.2.2 Subject to the requirements of the SATS, thr! pipeline shall be placed bcneath the tracks by open trench excavation or by the method of pipe jacking, PSIrench bencat11 the supported tracks of maximum width 2,s m at any point and shall adequately shore t
24、he sides of the trench during the entire operation to prevcnt any movement of thc adjacent embankment causcd by vibration drising from rail traffic. The slioring shall. extend horizontally beyond the limits of the track ballast for a distance equal to sit 1c;i:;t one and a half times tl-c dopth of t
25、he trench invert below formation level. psLG 1.2.4 If the pipc is to be installed by pipe jacking, the Contractor shall prc,vide adequately shored thrust and reception pits, and jacking and mucking operations shall be so carried out that no movement occurs in the embankment. carrying the raj.lway tr
26、acks. The Contractor shall provide trilequatc lighting to enable jacking to proceed contirluously and at night. Iit least two weeks before the first shoring is to be placed, thc Contractor shall scbmit to the Uigincer for approval, detailed calculations and drawings showing the design of the propose
27、d shoring and such other details of construction as may be required. No excavation in the prcximity of the railway embankment and no shoring of such excavation sliall lie coimenced before the approval of the Engirlcer is obtained. PSLG 1.2.5 Payment for all work between and shown on Drawing ., exclu
28、ding the manholes, will be made only under items . to ., and no further claim in connecrion with the rail crossing will be considered. Continuous Zackiy (Subclause 5.4.3.3) . Where the project requires the jacking of a pieline of diameter greater than l m or of length in excess of 30 m, specify that
29、 the iipeline is tc hc jacked continuousiy, so as to m.i.nimize problems caused by the build-up of skin Erict-ion on a static pip!. loierances (Subclauses 6.3. and 6. %) Maximum tolerances. Because alignment problems and risks inherc:nt irr the jacking operation compel a -.-p contractor to relate hi
30、s price directly to the tolerances spccificd, ensure that tolerances specified are the maximum acceptable. Unnecessarily tight tolerances lead to unnecessarily high prices. War in mind that function is paramount and that appearance, because the pipeline is buried, may :lot be of much importance. lcl
31、trorrces by aqrcenient. In situations whcrc the location oi the finished pipeline is of scconciary - importance, insert n PSLG clause that supersedes Subclause 6.2 of SARS 1200 LG and provide3 for the engineer and the contractor to reach agreemefit on the applicable tolerances after tenders have clo
32、sed but before pipe jacking commences. 1,iinimum tolerances. In cases such as cross-country oil pipe2.ines where a sleeve diameter may bc: only l00 nun more than the pipe diameter, specify tolerances in a project specification clause based on the rccommendtions given in Subclauses 2.5.3 and 2.5.4 of Section LC of Part 3 of the code.
