| 摘要 |
Pipe sealing apparatus and a jack for operating the sealing apparatus to effect repairs in sewer pipes and the like are disclosed. The sealing apparatus comprises a collapsible pipeliner (16, 18, 20, 22) constructed in a plurality of arcuate segments that define a closed loop which can be moved from a collapsed state in which the loop can be located in a damaged pipe to an erect state in which the loop defines a rigid pipeliner with a cylindrical outer surface. A compressible sealing material such as urethane foam is secured to the segments so that the sealing material covers the cylindrical outer surface when the loop is moved into the erect state. When the pipeliner is erected the sealing material is compressed between the cylindrical outer surface of the erected pipeliner and a damaged inner surface of the pipe to provide a fluid-tight seal. The pipeliner can be erected by expanding the closed loop vertically and thereafter horizontally until the loop assumes an oversized state from which the loop is biased to move into a locked-erect state of relatively smaller dimension. A hydraulically operated jack (30) for expanding the loop is described. |
