| 摘要 |
A method of and apparatus for replacing an existing underground conduit (1), e.g. pipe or cable, with minimal excavation is disclosed. A hydraulic ram (4) is used to inject sleeving along the path of the existing conduit (1) and a new conduit can then be run in with or without removing the existing conduit (1). The sleeving may be rotated and water may be forced through the sleeving so as to emerge at the front end, thereby assisting in progressing the sleeving through the earth.
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