| 摘要 |
In a method for installing underground piping, a pipe installation apparatus is temporarily positioned at one end of a pipe trench, in which bedding sand ha s been placed. The apparatus has a pipe opening through which pipe can pass, and a plurality of rubber-tired pipe wheels arrayed around and biased radially inward toward th e pipe opening. At least one wheel is a motor-operated drive wheel. A section of pi pe introduced into the pipe opening will be tractively engaged by the drive wheels and pushed through the pipe opening and into the trench. The drive motors are disengaged as required for connection of additional pipe sections, or for placing temporar y spacers in the pipeline to facilitate subsequent installation of required pipeline fittings. The leading end of the pipeline engages a sled which rides over and levels the bedding sand while preventing the pipe from digging into the sand. The need for workers to ente r the pipe trench is thus reduced or eliminated, making it possible to safely install piping in steep--walled trenches.
|
