PILE DRAWING CASING AND PILE DRAWING METHOD USING THEREOF

摘要

The present invention relates to a pile drawing casing. According to the present invention, it is possible to draw a concrete pile embedded deeply in the ground with a little force without damaging the concrete pile. The pile drawing casing comprises: a casing main body (110) piled in the ground to allow a pile embedded in the ground to be inserted thereto and having a wedge insertion hole (113) penetrating an outer peripheral surface thereof; a plurality of wedge portions (120) provided on a lower portion of the wedge insertion hole (113) of the casing main body (110), having the length and an angle adjusted according to the inflow and outflow of a working fluid, and moving through the wedge insertion hole (113) to contact and support a surface of the pile; and a wedge housing (130) coupled to protrude by a regular interval from the outer peripheral surface of the casing main body (110) along a circumferential direction so as to accommodate the wedge portions (120) and the wedge insertion hole (113). Each of the wedge portions (120) comprises: a wedge cylinder (121) which is hinged to a lower portion of the wedge housing (130) and through which the working fluid flows in and out; an elevation axis (123) accommodated in the wedge cylinder (121) and raised and lowered to the outside of the wedge cylinder (121) along the inflow and outflow of the working fluid; and a wedge (125) hinged to an upper end of the elevation axis (123), moving towards the pile (P) through the wedge insertion hole (113) by the elevation of the elevation axis (123), and contacting and supporting an outer peripheral surface of the pile (P).