BAG BODY FOR INJECTING BACK-FILLING MATERIAL OF SEGMENT FOR TUNNEL AND BACK-FILLING METHOD OF SEGMENT FOR TUNNEL

摘要

PROBLEM TO BE SOLVED: To provide bag bodies for infection, by which clearances are difficult to be formed among the mutual abutting sections of the bag bodies and a bedrock, and a back-filling method in the bag bodies for infecting a back-filling material by expanding the bag bodies installed to the rears of segments by the back-filling material and sealing spaces among the segments and the bedrock. ;SOLUTION: Excess sections 21 are formed at both ends in the longitudinal direction of a bag body 5, and sewn sections (a limiting member) 22 limiting an extent that the excess sections 21 are opened while being able to be released when a back-filling material is injected and the bag body 5 reaches proper pressure are extended and mounted in the cross direction of the bag body 5. Accordingly, a back-filling method can be divided into a first process, in which the back-filling material is injected while limiting the extent that the excess section 21 is opened and the bag body 5 is expanded as the excess section 21 is left as it is and brought into contact with a bedrock, and a second process, in which the back-filling material is further injected and the excess section 21 is opened.;COPYRIGHT: (C)1997,JPO