Method and apparatus for laying pipe
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United States of America Patent
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-
Mar 16, 1993
Grant Date -
N/A
app pub date -
Jun 28, 1991
filing date -
Jan 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
First and second frame assemblies (18, 20) are respectively provided with a pair of plate-like earth retainers (24, 36) and are alternately advanced by propulsion jacks (22). While the first and second frame assemblies are alternately advanced, the ground (14) is excavated to form a channel (16). A reaction force acting on the first frame assembly (18) when the second frame assembly (20) is advanced and a reaction force acting on the second frame assembly (20) when the first frame assembly (18) is advanced are respectively transmitted to the ground defining the channel by the action of first and second position maintaining force transmitting members and jacks (32, 52). When the first and second frame assemblies (18, 20) are advanced by required distances, a new pipe (12) is placed in the channel and connected to a pipe (12) already installed.
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