Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Patent
1994-08-30
1997-05-27
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
299 33, 405146, 405154, E21D 1100
Patent
active
056325754
ABSTRACT:
An apparatus and method for selectively injecting a liquid bentonite slurry around an exterior of a tunnel liner segment which is pressed into a tunnel being concurrently excavated during a pipe jacking installation. The bentonite slurry lubricates the exterior of the tunnel liner reducing the force required to press the tunnel liner into the tunnel. The apparatus allows an operator of the pipe jacking operation to selectively inject bentonite around individual tunnel liner segment or to allow the apparatus to selectively inject bentonite as required by a preset injection pressure threshold value.
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Thomson James, Pipejacking and Microtunneling, 1993, Great Britain, Blackie Academic & Professional.
Guterman Mark
Lorenzen Frank J.
Stignani Mark D.
Taylor Dennis L.
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