NET BASE ROCK SEMI-SHIELD TUNNELLING METHOD AND NEW BASE ROCK SEMI-SHIELD MACHINE FOR IT

摘要

PROBLEM TO BE SOLVED: To easily continuously discharge crushed pieces of gravels, cobbles, boulders, etc., to the outside through a new base rock semi-shield machine by uniting and hardening coarse gravels, cobbles, boulders, etc., in a foundation improved area and crushing them into pieces with a disk cutter. ;SOLUTION: Coarse gravels, cobbles, and boulders are crushed into pieces by advancing a down-the-hole hammer 3 by driving an earth-and-sand improving and hardening device 22. By ejecting a high-pressure water jet and compressed air, earth, sand, and slurry are sucked from a sludge port 10 and discharged to the outside. Then remaining coarse gravels, etc., are united and hardened by ejecting a hardening agent from a nozzle 8B and an accelerating agent from a nozzle 7 into the gaps among the gravels, etc. Then the united and hardened coarse gravels, etc., are crushed with a disk cutter 2 and the crushed pieces are taken from an opening 27 into a new base rock semi-shield machine and discharged to the outside through a hose.;COPYRIGHT: (C)1997,JPO