CONSTRUCTION METHOD FOR UNDERGROUND STRUCTURE, AND PILE HEAD STRUCTURE OF TEMPORARY INTERMEDIATE PILE

摘要

PROBLEM TO BE SOLVED: To provide a construction method for an underground structure, which can shorten a construction period when the underground structure is constructed by an inverted lining method, and a pile head structure of a temporary intermediate pile.SOLUTION: A construction method for an underground structure comprises: a pile arrangement step of arranging a temporary intermediate pile M in the ground; a first skeleton construction step of forming a first skeleton A above the temporary intermediate pile M; an excavation step of digging down the ground on the downside of the first skeleton A; a second skeleton construction step of forming a second skeleton B on the downside of the first skeleton A; and a third skeleton construction step of forming an intermediate wall C between the first and second skeletons A and B. In the third skeleton construction step, the intermediate wall C is formed in the state of winding in the temporary intermediate pile M.