The excavation mannered null firing base and the propulsion jack

摘要

PROBLEM TO BE SOLVED: To enhance workability by arranging excavators in front and rear lower parts of a stand and on the tip of a movable hood above the stand, and arranging a movable sliding body under the stand. SOLUTION: When a vertical directional liner clearance is excavated, while taking reaction by a reaction receiving material 31, a stand 11 is propelled in a liner clearance by a propelling jack 12, and earth and sand of the liner clearance are excavated by a vertically and laterlally freely movable excavator 13 of a front part of the stand 11. Next, according to excavation, a movable hood 14 above the stand and a movable sliding body 16 under the stand are interpenetrated into the liner clearance, and it is excavated by an upper rotary excavator 15 arranged in the hood 14 and a vertically movable lower rotary excavator 17 of a rear lower part of the stand. Next, excavating earth and sand are carried out by an excavating earth and sand carrying-out machine 18. After excavation, a sheathing material is installed in the liner clearance on the inside of the hood 14 and the sliding body 16, and a backfilling material is injected. A shielding machine is also advanced, and work is similarly repeated. Therefore, execution work can be efficiently performed, and cost can be reduced.