| 摘要 |
A method of relining an underground service pipe (1) which comprises: (a) providing a riser pipe (4) having a distal end, (b) installing the riser pipe (4) by excavating a hole (5) and lowering the riser pipe (4) through the hole (5) thus formed until the distal end of the riser pipe (4) is adjacent the underground service pipe (1), (c) severing a section of the service pipe (1), (d) removing the severed section of service pipe (1) to leave an upstream section (3) and a downstream section (2) of service pipe (1) remaining, (e) installing a chamber (20) in the riser pipe (4), said chamber (20) being provided with sealing means (34) for sealing said chamber (20) to the riser pipe (4) and having first and second lateral openings comprising respectively an upstream inlet (25) and a downstream outlet (26), (f) installing a liner pipe (40) into the downstream section (2) of the service pipe (1), (g) sealing the liner pipe (40) to the downstream outlet (26) of the chamber (20), and (h) sealing the upstream section (3) of the service pipe (1) to the upstream inlet (25) of the chamber (20). Furthermore, a method of installing a riser pipe is described. <IMAGE>
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