| 摘要 |
PROBLEM TO BE SOLVED: To provide a renewal method for discharge water riser, capable of preventing hole filling cement mortar filling a penetration part of a concrete slab from being co-lifted or collapsed, and a discharge water riser renewed by the method.SOLUTION: A renewal method for discharge water riser includes: a cut-off and removal step S1 for cutting off and removing a discharge water riser 10 of an object floor and a lower floor with straight pipe remainders 11a, 11b left; a cooling and contraction step S2 for cooling the straight pipe remainder 11b of the object floor to contract the straight pipe remainder and reducing adhesive strength of a concrete slab in contact therewith; a push-up opening step S3 for pushing the straight pipe remainder 11b of the object floor vertically upward from below to remove it and forming a vertical through-hole 5 in the concrete slab 2b; an intermediate part connection step S4 for connecting an intermediate part 12 of a new discharge water vertical pipe to a top of a straight pipe remainder 11a of the lower floor; and an upper end connection step S5 for inserting a slab penetrating member (collecting pipe for renewal) 18 having a vertical pipe part in its lower end from above into a vertical through-hole 5 and connecting the lower end of the slab penetrating member 18 to an upper end of the intermediate part 12. |
