| 摘要 |
Apparatus for laying pipe in a trench includes a housing with a bottom, side walls, a leading end wall and a trailing end wall, with a tapered nose at the leading end, the nose being designed to be pulled along a trench by a backhoe. The nose is hinged to the leading end wall and can be pivoted up and down when the housing is moved along the trench. The housing includes a trough which receives and orients a pipe and a pusher which moves the pipe along the trough and into assembled relationship with an end of a previously-laid pipe. A hopper near the trailing end of the housing has a chute which deposits fill material around the pipe. The trailing end wall has an opening with a slidable door to strike off the top of the fill material. Mechanism is connected to the trough and door to simultaneously move them up and down to maintain the pipe on grade and to maintain the depth of fill material constant relative to the pipe. The pusher includes a cart with gears which engage tracks on sides of the trough, the gears being driven by a fluid-operated motor which receives high fluid pressure when the pipe engages a previously-laid pipe, in order to assemble them. A sensor system sends signals through the pipe to receivers in the housing and in the nose to indicate the grade and alignment of the pipe.
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