Boring or penetrating the earth – Boring without earth removal – Drive point detached from shaft to form cased bore or with...
Patent
1994-06-30
1996-02-27
Buiz, Michael Powell
Boring or penetrating the earth
Boring without earth removal
Drive point detached from shaft to form cased bore or with...
E21B 700
Patent
active
054941180
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the placement of pipes in the ground.
The said pipes are rigid in nature so as to be capable of supporting the loading applied thereto by the surrounding ground and water table. Typically the pipes will be of steel or other rigid metal.
When it is required to place such pipes in the ground, obviously there needs to be excavation or boring in order to provide a cavity to receive the pipe. The most usual method of placing such a pipe is to use a boring or drilling rig which comprises a reaming head or more usually a plurality of reaming heads and a drill string. The reaming head is directed by remote control along a particular drilling path under the ground. It enters the ground at a shallow angle and then travels along the path in which the pipe is to be laid, and it eventually emerges from the ground at a desired remote location. A plurality of reaming heads of increasing size are used, and the heads are passed sequentially through the bore hole. The reaming heads as appropriate may be pulled rearwards through the previously formed borehole, but in any event the hole is continually increased in size until it is of the required diameter to receive the pipe which is simply pulled into position. During the reaming operation, a relatively viscous liquid known as Bentonite is flooded into the borehole being created which serves to some extent to maintain the shape of the hole and to stop debris and chippings from collecting to too great an extent in the base of the hole, and also to assist in the cutting operation, but as can be expected rock chippings and stones become suspended in the Bentonite, and some do collect at the base of the borehole. The result of this is that when the rigid pipe is eventually pulled into position it can be obstructed by these loose materials and if it is obstructed to too great an extent, then it is extremely difficult to pull the pipe into the desired position due to the friction forces created by these materials. Indeed, in practice it is the case that the length of pipe which can be pulled into a borehole is limited by these friction forces.
The rigid pipe may typically be a pipe for carrying fluid, or it may be a pipe for carrying other pipes some of which may be fluid pipes and others of which may be service pipes carrying electrical cables or telephone cables. Indeed the pipe can itself carry electrical cables.
The present invention seeks to enhance the laying operation to enable the pipe to be inserted more easily and to enable longer lengths of the pipe to be installed without difficulty.
In accordance with the present invention, in a boring operation wherein a rigid pipe is placed in the borehole, wherein a support lining tube of a flexible nature is used to support the surface of the borehole by the use of fluid pressure which urges the lining tube against said surface, and the rigid pipe is inserted into the flexible lining tube, and wherein the flexible lining tube is everted into and along the borehole immediately behind the last reaming head used for boring the borehole and wherein the rigid pipe is connected to the trailing end of the flexible lining tube so as to be pulled into the borehole thereby.
In accordance with a further embodiment of the present invention, in a boring operation wherein a rigid pipe is placed in the borehole, wherein a support lining tube of a flexible nature is used to support the surface of the borehole by the use of fluid pressure which urges the lining tube against the surface, and the rigid pipe is inserted into the flexible lining tube, and wherein the flexible lining tube is everted into and along the borehole immediately behind a reaming head used for boring the borehole and wherein a pull rope is attached to the trailing end of the lining tube so as to be pulled thereby into the borehole, and subsequently, the rope is used for pulling the rigid pipe into the borehole.
Preferably, water is used for the urging of the lining tube onto the borehole surface so that the rigid pipe is pulled into the inflating wate
REFERENCES:
patent: 4507019 (1985-03-01), Thompson
Buiz Michael Powell
Insituform (Netherlands) B.V.
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