UNDERGROUND CAVITY CONSTRUCTION METHOD AND UNDERGROUND CAVITY CONSTRUCTION THEREBY

摘要

PROBLEM TO BE SOLVED: To provide an underground cavity constructing method, capable of ensuring safe and low-cost construction in a soft ground by making working pits around an underground cavity before drilled and constructed to reinforce the ground, and provide the underground cavity. ;SOLUTION: In a construction method, a plurality of working pits are basically constructed outside a cavity-planed ground with a safe and reliable shield machine and a reinforcing soil zone is formed through the working pits along the vicinity of a cavity to drill a predetermined cavity by using a low-cost mountain tunnel technique. The working pits on reinforcement-necessary sides are refilled if required, the working pits are only refilled for reinforcement without forming the reinforcing soil zone or the working pits are utilized as drain pits 18 if the underground cavity should be reinforced with bolts suspended from the working pits or the underground cavity 15 should be constructed in an aquifer. The working pits are connected to the underground cavity after work is completed to construct the integrated underground cavity to be served as effective pits for ventilation 16, evacuation 17 or others.;COPYRIGHT: (C)1999,JPO