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16.0 预应力管道细节 16.1 材料厚度 16.1.1 金属预应力管道 金属预应力管道为镀锌、带波纹的半刚性管道。对于钢绞线和钢丝束,管道厚度为26标准尺直径2 (5/8)in。对直径大于2 (5/8)in的管道,厚度应为24标准尺。对于粗钢筋力筋,管道厚度应小于31标准尺。 16.1.2 聚乙烯预应力管道 聚乙烯预应力管道或刚性管道用作体外管道时,应使用高密度聚乙烯,这种材料应满足AASHTO D3350的要求。体内聚乙烯管道应带有螺旋状波纹。刚性管道可按照ASTM D2447、ASTM F714或ASTM D2239的要求制造。材料厚度按以下选取: (a)体内聚乙烯管道厚取0.050in±0.010in (b)体外聚乙烯管道的最小外径和壁厚之比为2.5或更小。
16.0 Details of Prestressed Pipe 16.1 Material Thickness 16.1.1 Metal Prestressed Pipe Metal prestressed pipe is a galvanized, corrugated semi-rigid pipe. For strands and wire bundles, the pipe is 26 gauge in diameter 2 (5/8) in. For pipes larger than 2 (5/8) in diameter, the thickness shall be 24 ft. For the thick bar tendons, pipe thickness should be less than 31 standard ruler. 16.1.2 Polyethylene prestressed pipes Polyethylene prestressed pipes or rigid pipes used for in-vitro pipework should be made of high-density polyethylene, which shall meet the requirements of AASHTO D3350. In vivo polyethylene pipe should be with spiral ripples. Rigid pipes can be made to ASTM D2447, ASTM F714 or ASTM D2239. Material thickness is to be taken as follows: (a) In vivo polyethylene tubing thickness 0.050 in ± 0.010 in. (B) In vitro polyethylene tubing has a minimum OD to wall thickness ratio of 2.5 or less.