| 摘要 |
PROBLEM TO BE SOLVED: To provide hot water piping capable of suppressing the temperature drop of hot water supplied from a boiler, caused by the mutual heat exchange of forward and return piping when conveying hot water, protecting the forward and return pipes inside from deformation and damage caused by external load after the construction of the hot water piping and coping also with a subway construction method and a resin pipe renewal method. SOLUTION: In this hot water piping, an integrated body of the forward pipe and return pipe formed by binding the resin forward pipe through which high temperature hot water supplied from a heat source flows, and the resin return pipe through which low temperature warm water after radiating the heat of the high temperature hot water at a radiating terminal flows, by a binding film, is stored inside a shield tube without being fixed to the inner surface of the shield tube, and an isolating member for preventing direct contact between both pipes is disposed between the forward pipe and return pipe in the integrated body of the forward pipe and return pipe. COPYRIGHT: (C)2006,JPO&NCIPI
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