CONSTRUCTION METHOD BY REVERSE DRIVING WORK METHOD IN UNDERGROUND CONSTRUCTION

摘要

PROBLEM TO BE SOLVED: To reduce tentative work to improve workability by securing a penetration space of column reinforcement through arrangement of pipe after exavation to the lower position of beam, arranged in this pipe the column reinforcement followed by the application of grout thereinto, and integrating the same with the beam and slab. SOLUTION: After excavation of lower floor part to the position where a stop frame 1 at a beam lower part is assembled, without application of column reinforcement, a winding pipe 3 is disposed at the position to surround a tentative suppport colunm 2 and the penetration opening of column reinforcement 5 is thereby formed, then concrete of beam slab 4 is placed. Then, after the completion of next excavation process, the column reinforcement 5 is inserted into the column reinforcement penetration opening formmed by the winding pipe 3. Also, by pressure contacting the column reinforcement adjacent thereto up and down the reinforcement 5 is placed in the pipe 3, then grout 6 is poured into the colum reinforcement insertion opening to fill up the gap between the reinforcement 5 and the pipe 3. Accordingly, the execution of column reinforcement can be made on the slab of actual construction completed, thereby dispensing with the foothold, resulting in improvement of workability.