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    • 5. 发明专利
    • DEVICE TO PREVENT OUTFLOW OF MUD WATER DURING EXTENSION OF PIPING
    • JPH07301092A
    • 1995-11-14
    • JP11474994
    • 1994-04-28
    • SHIMIZU CONSTRUCTION CO LTD
    • NAKAYAMA MASAAKIKINOSHITA KIICHI
    • E21D9/13E21D9/06
    • PURPOSE:To perform a smooth work to extend a piping by a method wherein a sealing mechanism on the discharge side and a sealing mechanism on the feed side are relatively moved by a hydraulic cylinder. CONSTITUTION:In extension of a feed pipe 2 and a discharge pipe 3, a main valve on the discharge pipe 3 side is first closed and a fresh water is fed to a containing pipe 16 of a sealing mechanism part 6 on the feed side through a feed pipe 17a. At a point of time when a mud water sealing member 20 passes a flexible pipe 22, a feed is stopped. A main valve 23 is then closed, a pressure on the fresh water side is released by a pressure release valve 21 to seal the feed pipe 2. A given sealing process on the discharge side is carried out simultaneously with a sealing process on the feed side. The discharge pipe 3 is sealed in a way that a slider 29 is lowered and slid through operation of a hydraulic cylinder 28. Consecutively, the feed pipe 2 and the discharge pipe 3 are separated away from each other through a given work, and insertion connection of a piping, connection of the feed pipe 2 and the discharge pipe 3 are effected, in the order. Through expansion and contraction of a hydraulic cylinder 40 of a sealing mechanism part 7 on the discharge side, the positions of the rear end of the containing pipe 16 and the rear end of a coupling pipe 31 on the rear side are matched with the feed pipe 2 and the discharge pipe 3 for regulation of a position.