Building of hydraulic tunnels with high head and large diameter increase gradually, and the underground reinforcedconcrete branch pipe is adopted in more and more projects.
相应的高水头大直径水工压力隧洞的建设也逐渐增多。并且越来越多的工程采用地下钢筋混凝土岔管。
2
Temperature Stress in open reinforcedconcrete pressure pipe usually is one of the important reasons why their longitudinal cracks-occur in use.
外露式钢筋混凝土压力管道的温度应力，常是某些这类管道在运用期内产生纵向贯通裂缝的重要原因之一。
3
Reinforcedconcretepipe could be regarded as flexible pipe.