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. SABS 0120 : Part 2 Section LB-1983 Bedding (pipes) C1 ause PART 2 : PROJECT SPECIFICATION SECTION LB CONTENTS Page Number ESSENTIAL PROJECT SPECIFICATION
4、 CLAUSES 1 ESSENTIAL DATA . 1 ADDITIONAL CLAUSES . 1 General . 1 Normal Projects 1 Source of bedding materials . 1 Class of bedding 2 Pipe bedding : Class A reinforced 2 Prestige Projects 2 Subeconomic Projects . 2 Labour-Based Projects . 2 First Revision March 1983 This section of the code supersed
5、es SABS 0120 : Part 2 : Section LB-1980 Approved by the COUNCIL OF THE SOUTH AFRICAN BUREAU OF STANDARDS SABS 0120 : Part 2 Section LB-1983 Bedding (pipes) SABS 1200 LB : BEDDING (PIPES) NOTE a) Number the PSLB clauses in Portion 2 of the project specification in the sequence in which the clauses to
6、 which they relate appear in SABS 1200 LB. b) The clause number(s) 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 LB. ESSENTIAL PROJECT SPECIFICATION CLAUSES Certain subclauses of the specifications refer
7、to requirements that must be stated in the project specification. Set out as indicated below suitable clauses in Portion 2 of the project specification to provide the essential information. a) (Subclause 3.1) Where the material likely to be most readily available for use as selected granular materia
8、l has a compactibility factor less than or exceeding 0,4 (see Subclause 4.2.3 of Section LB of Part 3 of the code) but is otherwise acceptable, state the maximum compactibility factor that will be acceptable. b) (Subclause 3.4.2) Where the engineer requires the contractor to use selective methods of
9、 trench excavation, insert a clause such as that given in 3.2.1.2 below and state which material (and its source) is to be selected for the granular bedding cradle and for the selected fill blanket. (See also Subclause 1.3.3 of Section LB of Part 3 of the code.) c) (Subclause 5.4) Specify where pipe
10、s are to be encased in concrete. d) (Subclause 8.1.5) Where surplus material is to be disposed of at a distance greater than 0,5 km, set out the requirements in regard to freehaul and selection of the disposal sitels). ESSENTIAL DATA The availability of certain essential data may affect the prices t
11、endered. Except where such data have been given in the schedule or in the tender drawings, set out suitable clauses covering items such as the following in Portion 2 of the project specification: a) (Subclause 3.1) If it is desired to specify grading limits for the selected granular material that ar
12、e different from those specified in Subclause 3.1 of SABS 1200 LB. state the acceptable limits. b) (Subclause 3.3) State whether the pipeline is regarded as flexible and, when relevant, state the class of bedding to be used. ADDITIONAL CLAUSES GENERAL. Where it is necessary to amplify or otherwise v
13、ary the terms of SABS 1200 LB to render them suitable for use in projects to be carried out in particular locations or under particular circumstances, include in Portion 2 of the project specification clauses dealing with matters other than those covered by Clauses l and 2 above. NORMAL PROJECTS NOT
14、E: To meet requirements 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) . Source of Beddipg Materials General. Wherever practicable, indicate, in a clause such as t
15、he following, the source of acceptable bedding materials (See also Subclauses 1.3.3.1 - 1.3.3.3 of Section LB of Part 3 of the code.): PSLB 1.1 Bedding materials (Subclause 3.4). Suitable selected bedding material will generally be available from trench excavations along the route. Additional materi
16、al may be obtained from other excavations such as those for . in the vicinity of the trench. Contractor required to excavate selectively (Subclause 3.4.1). Where the engineer requires that the contractor use methods of excavation that enable him to select material that is suitable for bedding from m
17、aterial excavated from a pipe trench, use a clause such as the following (See Subclause 1.3.3.2 of Section LB of Part 3 of the code.) : PSLB 1.2 Contractor to excavate selectively for bedding materials (Subclause 3.4.1). Notwithstanding the requirements of Subclause 3.7 of SABS 1200 DB) and Subclaus
18、e 3.4.1 of SABS 1200 LB regarding the use of selective methods of excavating, the Contractor shall use selective methods of excavating and shall provide and use plant that will enable him to avoid burying or contaminating material that is suitable and is required for bedding. Provision of bedding ma
19、terials for Department of Environment Affairs and Fisheries projects. A clause such as the following may be required in a contract for the Department of Environment Affairs and Fisheries : PSLB 1.3 Measurement and payment for provision of bedding (Subclause 8.2). The provisions of Subclauses 8.2.1 a
20、nd 8.2.2 shall not apply to this contract. Separate items have been scheduled for selected granular material and selected fill material supplied from any source. l) arthworks (pipe trenches). SABS 0120 : Part 2 Section LB-1983 Bedding (pipes) The rate shall cover the cost of acquiring such bedding m
21、aterials (each of which shall comply with the applicable requirements of SABS 1200 LB), of delivering them to points alongside the trench so spaced as to suit the Contractors method of working, and of disposing of any material displaced by the importation. The rate shall apply regardless of whether
22、the Contractor acquires either of the bedding materials by selection from excavated material alongside the trench or from any other source within a freehaul distance of 5 km from the point of pipelaying. Any haulage distance in excess of the freehaul distance of 5 km shall, unless prior approval has
23、 been obtained, be regarded as freehaul. (See also Sections LB of Part 3 and Part 5 of the code.) NOTE: Where a clause such as PSLB 1,3 above covers a freehaul distance greater than 5 km, ensure that the schedule includes an item for payment for overhaul and that the quantity scheduled is realistic.
24、 The cost that the contractor will incur if he exceeds the freehaul distance without prior approval should discourage him from importing materials from distant points in cases where the cost of such importation has not been disclosed to and approved by the employer before the contract is awarded. 3.
25、2.2 Class of Bedding (Subclause 5.1). Where most of the pipeline is to be laid in bedding of one class and certain sections in bedding of one or more other classes, draw attention to the location and class of each other class of bedding required. 3.2.3 Pipe Bedding : Class A Reinforced (Subclause 5.
26、2.1). When it is necessary to increase the bedding factor (see Subclause 2.1.4 of Section LB of Part 3 of the code) of a portion of a pipeline above 3 by reinforcing the concrete bed, consider a clause such as the following (see also Subclause 2.2.1.1 of Section LB of Part 3 of the code): PSLB 1.4 R
27、einforced bedding. The Contractors attention is drawn to the high load conditions applicable to the pipeline between and . . Between these points the concrete bedding shown on Drawing . shall be strengthened with reinforcing steel as ordered. Such steel will be measured and paid for separately under
28、 the scheduled items for reinforcement. 3.2.4 Concretes (Subclause 5.4). Where it is required that a pipeline (other than a sewer covered by SABS 1200 LD) be encased in concrete, frame a PSLB clause using Subclause 5.7 of sABS 1200 =D*), suitably modified. 3.3 PRESTIGE PROJECTS. Where SABS 1200 LB i
29、s not suitable for a prestige project, include an appropriate specification in the contract. 3.4 SUBECONOMIC PROJECTS. Until a suitable standardized specification for subeconomic projects has been published, state which requirements of SABS 1200 LB will not be applicable to the contract. Pay particu
30、lar attention to the requirements dealing with selected granular material (see also Subclause 1.3.3.3 of Section LB of Part 3 of the code in which acceptable alternative materials are suggested for a case where loads on a pipeline are light). 3.5 LABOUR-BASED PROJECTS. Either include SABS 1200 LB in the contract and state which requirements of SABS 1200 LB will not be applicable, or insert appropriate clauses (based on SABS 1200 LB) in Portion 2 of the project specification. -V- 2) Sewers. sabs pta
