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US 5,494,118 AGranted
Placement of pipes in the ground
AssigneeInsituform (Netherlands) B.V.
InventorEric Wood, deceased
Life of this patent
Estimating the term…
Abstract
The invention provides that an underground through borehole (28) is formed with a reaming tool (24). It is filled with a viscous fluid and as soon as possible after being so filled, a flexible lining tube (32) is inserted into the borehole (28) to keep the surface from collapsing until a rigid service pipe (12) has been pulled or pushed into the borehole.
Claims6
A method of placing a substantially rigid pipe (12) in a borehole, in the ground, comprising:
- boring a longitudinal borehole in the ground with a boring member including a reaming head (24);
- everting a flexible lining tube (32) into and along the borehole (28) immediately behind the advancing boring member;
- and
- supporting the lining tube 32 against the surface of the borehole (28) by fluid pressure;
- connecting a substantially rigid replacement pipe (12) to the trailing end of a flexible lining tube (32), the rigid pipe (12) is pulled into the borehole (28) as the flexible lining tube (32) everted by fluid pressure.
2 more elements
A method of placing a substantially rigid pipe (12) in a borehole (28);
- comprising:
- boring a longitudinal borehole in the ground with a boring member including a reaming head (24);
- everting the flexible lining tube (32) with a fluid immediately behind the advancing boring member (24);
- supporting the flexible lining tube (32) against the surface of the borehole (28) by fluid pressure;
- attaching a pull rope to the trailing end of the everting lining tube so as to be pulled into the borehole (28);
- and
- attaching the trailing end of the rope to the substantially rigid pipe (12) for pulling the pipe (12) into the borehole (28).
4 more elements
Dependencies are inferred from the claim text.