| 摘要 |
An apparatus for pulling out an H-beam used for retaining wall construction is provided to shorten the time required for pulling out an H-beam by using strong hydraulic pressure of a main pullout device and high responsibility of an auxiliary pullout device. An apparatus for pulling out an H-beam used for retaining wall construction is composed of a main pullout device(100) and an auxiliary pullout device(200). The apparatus pulls out an H-beam(H) buried under the ground to the appointed height by projecting and retracting each piston rod(51) of two main hydraulic cylinders(5a,5b) repeatedly while compressing the middle part(H1) of the H-beam with two main actuating wedges(4a,4b) using middle- or small-sized hydraulic cylinders, wherein the two auxiliary hydraulic cylinders are composed of the middle- or small-sized hydraulic cylinders having smaller pullout pressure than the two main hydraulic cylinders of the main pullout device and installed to the front and rear sides of the top of a main pullout actuator vertically to face each other, and each front end of a piston rod of the two auxiliary hydraulic cylinders is connected to a support formed on front and rear sides of an auxiliary pullout actuator(9) to reciprocate the auxiliary pullout actuator vertically. |
