| 摘要 |
For laying a string of pipe, a main sled and the trailer sled are adapted to be towed in a trench by a trenching machine. The sleds slide along the trench bottom on parallel runners and define a generally continuous pipe supporting surface inclined downwardly from the leading end toward the trailing end. The sled supports the end of the assembled pipe string, the next pipe section to be joined to the string for facilitating the assembly. The sleds are self centering within the trench and carry implements for preparing the trench bottom to receive the pipe string.
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