Application of occlusal pipe pile cast-in-situ in retaining and protection of foundation excavation

Compared with old type,the new type of pile shoe has knurled trumpet shape which increases the quantity of soil going to steel pipe.The working principle of earth-removing pipe and the connection between steel pipe and steel cover board are present herein.Additionally,notch of steel pipe and steel cover board are analyzed as well as the construction of occlusal pipe pile cast-in-situ.As a retaining pile,occlusal pipe pile cast-in-situ can resist lateral earth pressure in foundation pit engineering and has the characteristics of big stiffness of flexural members.Still,it improves soil extrusion and reliable seepage control.Compared with underground diaphragm wall,it can save forty percent steel and concrete at least.So,occlusal pipe pile is the most economical foundation pit which has no less than three stories underground as well as the extra-deep platform of rail transit.