Allowing the use of cements conforming to is 8041

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Unformatted text preview: s conforming to IS: 8041-1978', IS : 8043-1978' and IS: 8112-197(j4 for the manufacture of concrete pipes; Modification in the length of pipes allowing the manufaoturer to declare the effective length which shall be between 1.0 and 4’0 m; b) Allowing the use of wire fabric conforming to IS : i566-1982”, deformed bars and wires Tode revision of pra&ce pipes Modification in di’fferent design requirements of the pipes; (first for rapid hardening Inclusion of larger diameter pipes for all classes of pipes except for class NPl and PI; Portland cement (firs: ). Gpecitication revision of concrete ). Vjpecitication revision for laying for hydrophobic Portland cement (firsr ). ‘Specification for high strength deformed steel bars and wires for concrete reinforcement ( third revision ). ZSpecification for structural steel ( standard quality ) (fifth revision ). Yjpecification for 43 grade ordinary Portland cement. Yjpecification for hard-drawn steel wire fabric for concrete reinforcement ( second revision ). 1 IS :458 -1988 k) Inclusion of a clause on repair of pipes; and m) Modification pipes. should be treated as actual internal diameters with tolerances specified in this standard and such moulds should be made suitable for manufacturing pipes with flexible rubber ring joints. in sampling and inspection of 0.3.2 In order to accommodate the existing moulds used by rhe manufacturers for manufacturing class NP3 pipes given in the earlier standard, the diameters of class NP3 and NP4 pipes in this revision have been given as nominal internal diameters. The actual internal diameters of these pipes are, therefore, to be declared by the manufacturers. However, the manufacturers should gradually change their moulds as it has been desired that after 1995, these nominal internal diameters 0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS : 2-196Ol. The number of significsnt places retained in the rounded off value should be the same as that of the specified value in this standard. IRules Class 1.2 Prestressed concrete pipes and pipes with noncircular section are not covered by this standard. Conditions Where Normally Used Unreinforced conCrete non-pressure pipes For drainage and irrigation use, above ground or in shallow trenches Np2 1.1 This standard covers the requirements for reinforced and unreinforced precast cement concrete pipes, of both pressure and non-pressure varieties used for water mains, sewers, culverts and irrigation. Description NP1 1. SCOPE Reinforced concrete, Jight-duty, aon-pressure pipes For drainage and irrigation use, for carrying culverts light traffic For drainage and irrigation use for carrying culverts medium traffic 2. TERMINOLOGY Np3 i Reinforced concrete, medium-duty, nonpressure pipes 2.0 For the pvrpose of this standard, the following definitions shall apply....
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This document was uploaded on 10/01/2013.

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