BAG BODY FOR CIVIL ENGINEERING WORK

PROBLEM TO BE SOLVED: To provide a bag body which is compactly foldable, easy to handle, and exerts high pressure resistance. SOLUTION: The bag body 10 for civil engineering works is comprised of a changing-diameter cylindrical fabric 11 having: two small-diameter portions 11a, 11b which are formed at both ends thereof; three large-diameter portions 11c, 11d, 11e which are formed between the two small-diameter portions 11a, 11b; and connection portions 11f, 11g which are smaller in diameter than the large-diameter portions 11c, 11d, 11e and connect between the three large-diameters 11c, 11d, 11e, respectively. Then, the two small-diameter portions 11a, 11b of the different-diameter cylindrical fabric 11 are superposed on each other by folding back one of them inward, and connected together, to thereby form an annular space 12 between an internal folded portion 11h and an external surface portion 11i. The bag body has an injection port 15 for injecting a filler 8 into the annular space 12. COPYRIGHT: (C)2007,JPO&INPIT