Boring or penetrating the earth – Boring without earth removal
Patent
1996-11-04
1998-12-08
Tsay, Frank
Boring or penetrating the earth
Boring without earth removal
61 35, E21B 726, E02D 700
Patent
active
058457208
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of providing a substantially leakproof shielding layer in the ground and a device for performing the method. A shielding layer of this kind is necessary to delimit a ground area from the surrounding ground, such that material accumulated in said area will not spread thereby causing contamination or damage. Examples of such ground areas are refuse dumps and bodies of water.
PRIOR ART
It is previously known to make long holes in the ground the extension of which may be horizontal, for example under a road. Examples of a device capable of making such holes are given in EP 0 195 559. Said device includes a head connected to a drill string and having nozzles which under high pressure and at high speed eject liquid that carries out the making of the holes. The head is provided with means to orientate it round its longitudinal axis thereby to guide the head in a desired course.
It is also previously known to insert into a drill hole an injection head provided with nozzles which under high pressure eject a liquid injection medium which will mix with the ground material surrounding the hole and, on removal of the head, will solidify and form a leakproof layer.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method and a device by which a shielding layer can be provided in a simple and economical way by the use of simple means.
This object is achieved in that the invention has been given the features stated in the characterizing portions of the independent claims.
DESCRIPTION OF THE FIGURES
FIG. 1 is a schematic side view, in section, showing a ground area with a partially made hole and a device for performing the method according to the invention,
FIG. 2 is a schematic side view, in section, showing the ground area and the device of FIG. 1, wherein the hole is completely made and partly injected,
FIG. 3 is a section along the line A--A of FIG. 2 according to a first type of extension of the injection,
FIG. 4 is a section along the same line A--A of FIG. 2 according to a second type of extension of the injection, and
FIG. 5 is a view of a portion of FIG. 4, on an enlarged scale.
PREFERRED EMBODIMENTS
A ground area consisting of porous rock and/or soil, in which a shielding layer is to be provided, is indicated at M1. In and/or on this area there is an area M2 with, for example, refuse matter, to be screened off from the surrounding ground area in order to prevent, for example, contamination thereof.
In FIGS. 1 and 2 there is shown a machine 1 and a plant 2 placed on the ground surface on either side of the area M2. The machine 1 is a drilling machine, for instance of the kind marketed by Atlas Copco AB, Stockholm, Sweden, under the registered trademark of TERRABOR, while the plant 2 is a jet injection plant, for example of the kind made by Colla CCP International, Parma, Italy, and referred to as Jet Grouting. The drilling machine 1 is designed so as to be able to feed a tubular, flexible drill string 3 backwards and forwards and also rotate it round the longitudinal axis of the drill string. One end of the drill string 3 is detachably connected to a drill head 4 which is known per se, such as a drill head shown in SE-B 464 146. Said drill head is provided with an oblique leading guide surface 5 and one or more nozzles (not shown) in the front portion of the head, through which fluid can be ejected under high pressure and at high speed. The fluid is fed through the drill string 3 from a source (not shown) placed at the machine. The drill head 4 is provided with means (not shown) which are known per se and which provide the operator of the machine 1 with information on the orientation of the head round its longitudinal axis as well as on the distance of the head from the ground surface.
During the advance of the drill head 4 achieved by the machine 1, beginning at a location S1 and ending at a location S2 on the ground surface, the head makes an elongated, substantially horizontal hole H in the ground under the area
REFERENCES:
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patent: 3485052 (1969-12-01), Turzillo
patent: 3800544 (1974-04-01), Nakanishi
patent: 4785885 (1988-11-01), Cherrington et al.
patent: 4867240 (1989-09-01), Colla
patent: 4905773 (1990-03-01), Kinnan
patent: 4928775 (1990-05-01), Lee
patent: 5002137 (1991-03-01), Dickinson et al.
Borjeson Niclas
Pettersson Sten-Ake
Atlas Copco Craelius AB
Tsay Frank
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