In order to solve the problems of winter construction,environmental pollution, and big investment of drill pile in
precast yard sub-grade treatment, adopted high strength pre-stress pipe pile in No.24 precast yard in Hada Railway Special
Line. Practice shows that the PHC pipe pile is more mature than drill cast-in-place pile and manual drill pile. It is precasted in
factory and constructed fast,and the cold weather in winter and yard limit make few influence to PHC. The PHC also has the
advantages of little environmental pollution and low cost,so that it can be widely used in precast yard construction.
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