That is equal to half the total ss of ion gitudinals

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Unformatted text preview: 95.’ (Page 3, clause 5.1.1) — Substitute the following for the existing clause: ‘5.1.1 The barrel wall thickness shall be such that under the specified hydrostatic test pressure, the maximum tensile stress in concrete, when considered as effective to take stress along with the tensile reinforcement, shall not exceed 2 N/mm* for pressure pipes and 1.5 N/ mm2 for non-pressure pipes. But the wall thickness shall be not less than those given in Tables 1 to 7 subject to 7.2(c), in case of pipes manufactured by spinning process. For pipes manufactured by casting process, the wall thickness shall be as given in Tables 3A, 3B, 4A and 4B.’ (Page 3, footnotes below clause 5.1.1) — Substitute the following footnote 2 for the existing footnote 2 and insert the following new footnote 5: ‘*Codeof practice for plain and reinforced concrete (&ourtlrevision). r specification for admixtures for concrete (@revision).’ (Page 4, clause 5. 1.3) — Insert the following at the end of the clause : ‘in case of pipes manufactured by spinning process. For reinforced pipes manufactured by casting process, the minimum longitudinal reinforcement shall be as given in Tables 3B and 4B.’ Price Group 4 1 ,, I Amendment No. 3 to IS 458:1988 [Page 4, clause 5.2.2, last sentence (see also” Amendment No. 2)] — Substitute following for the the existing last sentence: ‘In the absence of calculations and tests, the reinforcement given in Tables 2 to 7 for pipes manufactured with spinning method and h Tables B and4B for pipes manufactured by casting process shall be used as minimum 3 reinforcement subject to the requirements of 5.2.2.1.’ [Page 4, clause 5.3, (see also Amendment No. 2)] — Substitute the following for existing clause: ‘5.3 The ends of concrete pipes used for water mains, sewers and irrigation shall be suitable for socket and spigot, roll on joints or confined gasket joints. Dimensions of spigot and socket for rubber ring roll on jointed pipes shall be as given in Tables 8 to 13 for pipes manufactured by spinning process. However, the dimensions of spigot and socket shall be as given in Tables 10A and 10B in case of pipes manufactured by casting process. Reinforcement in socket of rubber ring jointed pipes shall be as given in Table 14. However the ends of concrete pipes used for road culverts may be suitable for flush or collar joints (see Fig. 1 and Fig. 2). Dimensions of collars shall be according to details given in Tables 1, 15 and 16. The reinforcement for collars shall be as given in Tables 15 and 16. The ends of collar reinforcement shall have a full ring at both ends.’ (Page 4, clause 5.3, Note 2) — Delete Note 2 and renumber Note 3 as Note 2. (Puge 4, c/ause 5.3.1) — Insert the following in the beginning: ‘Only flexible rubber ring joints shall be used in the joints in (a) all pressure pipes, and (b) all non-pressure pipes except when used for road culverts.’ (Page 8, Table 3, CO11, heading) — Delete the word ‘Nominal...
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