| 摘要 |
PURPOSE:To secure the diameter enlargement of a spiral tube by winding a banded body spirally, then fixing the opposed faces of the side edge parts of the banded body mutually with a fixing sheet having wire material held in between, and pulling the wire material out to cut the sheet material after the insertion of the spiral tube so as to make the side edge parts slidable. CONSTITUTION:A banded body with protrusions disposed at one side edge part thereof and recessions 14 disposed at the opposite side thereof is wound spirally by a tube manufacturing machine 20, and the insert part 12b of each protrusion 12 is inserted into each recession 14 to lock both side edge parts mutually. A twofold fixing sheet 31 with wire material 30 held in between fixes the locked part of the side edge parts through adhesive 40 to adhere both side edge parts mutually. In this state, the banded body 10 is pushed forward as a spiral tube 10' from the tube manufacturing machine 20 into a sewer pipe 81. The tip of the spiral tube 10' is fixed at the sewer pipe 81, and the tube manufacturing machine 20 is driven while pulling the wire material 30 at the tip part inward the spiral tube 10'. Then the folded edge of the fixing sheet 31 is cut. The above-mentioned insert part 12b thereby becomes slidable in the recession 14, and the spiral tube 10' is enlarged in its diameter by this sliding motion and stuck to the inner face of the sewer pipe 81. |
