STEEL PIPE FOR INNER EXCAVATION PILE CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a steel pipe for an inner excavation pile construction method that can prevent excavated earth from adhering or stopping on shear keys when providing the shear keys protruding in an axial center perpendicular direction on a hollow side around a lower end of the steel pipe, regarding the steel pipe that is used for the inner excavation pile construction method to excavate by setting a down-the-hole hammer in the steel pipe in an inner excavation manner.;SOLUTION: In a steel pipe for an inner excavation pile construction method provided with shear keys 13 protruding in an axial center perpendicular direction on a hollow side around a lower end of the steel pile 1 which is used for an inner excavation pile construction method to excavate by setting a down-the-hole hammer 6 in an inner excavation manner in the steel pipe 1 serving as a steel pipe pile or a steel pipe sheet pile, the shear key 13 has a round tip part protruding from a steel pipe inner wall to the axially perpendicular direction without having recesses in the cross section in the steel pipe axial direction.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2020,JPO&INPIT