| 摘要 |
A bore hole sleeve reaming apparatus which is characterized by one or more subterranean bore clearing devices or sleeves for use with one or more clearing or bursting heads attached to a pull rod or cable and a pulling apparatus. One or more tapered sleeves are attached in spaced-apart relationship to a string of tandem-mounted plastic pipe when the clearing or bursting head or heads are attached to the pipe string to be pulled through the bore hole. The tapered sleeves are designed to straighten bore irregularities and clean, smooth and free the bore hole from collapsing earth, roots and/or rock and broken pipe and facilitate pulling the pipe string through the bore hole with minimum friction on the pipe string. The clearing sleeve elements are sequentially pulled through the bore hole with the clearing or bursting head(s) and pipe string from an entry pit using a pull rod or cable and a pulling apparatus is seated in a corresponding exit pit spaced from the entry pit and receives the opposite end of the pull rod or cable. A method for clearing and cleaning a subterranean pilot bore or tunnel is also disclosed.
|
