Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Patent
1989-11-16
1991-06-04
Kisliuk, Bruce M.
Boring or penetrating the earth
Boring without earth removal
Fluid passage to exterior of drive point
175 61, 175 67, 175 73, 175399, 175400, E21B 718, E21B 726
Patent
active
050206087
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a device for boring holes in the ground.
The device includes a hollow, flexible conduit, a head which is connected to one end of the conduit and which is fitted with at least one nozzle through which fluid passing along the conduit under pressure is delivered in such a direction and under such pressure that when the head is not in rotation, the head will form a hole of curved configuration and such that when the head rotates about its longitudinal axis and the conduit is moved forwards in the hole-forming direction the head will form a substantially straight hole, the end of said head facing towards the holeforming direction being provided with a surface which is positioned obliquely to the longitudinal axis of the head and which assists the head in forming said hole.
2. Background Prior Art
Devices of this kind are known to the art, for instance from European patent application No. 86301590.5 (publ. No. 0 195 559) and UK patent application No. 8 225 486 (publ. No. 2 126 267A).
These known devices have been found to function satisfactorily in certain types of ground composition and less satisfactorily in other types of ground, particularly in ground which consists of loose soil and clay layers, due in part to the fact that the nozzle-carrying head is not steered in a path of sufficiently pronounced curvature as the head is advanced when not in rotation. The heads of these known devices are also of complicated configuration and become worn relatively quickly.
SUMMARY OF THE INVENTION
An object of the present invention is to improve devices of the aforesaid kind, and to provide such a device which will enable the head to be steered in a desired path, substantially irrespective of the nature of the ground in which the holes are formed, and which is reliable in operation and of simple construction.
This object is achieved by the inventive device having the characteristic features set forth in the following claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional side view of a first embodiment of the inventive hole-forming device;
FIG. 2 is an end view of the device, seen from the right in FIG. 1;
FIG. 3 is a sectional side view of a second embodiment of the inventive device;
FIG. 4 is an end view of the device, seen from the right in FIG. 3;
FIG. 5 is a sectional side view of a third embodiment of the inventive device;
FIG. 6 is an end view of the device, seen from the right in FIG. 5;
FIG. 7 is a sectional side view of a fourth embodiment of the inventive device;
FIG. 8 is a sectional side view of a fifth embodiment of the inventive device;
FIG. 9 is a sectional side view of a sixth embodiment of the inventive deivce in a first position;
FIG. 10 is a top view of the device in FIG. 9; and
FIG. 11 is a sectional side view of the device shown in FIG. 9 in a second position.
DESCRIPTION OF PREFERRED EMBODIMENTS
All of the hole-forming devices illustrated in the drawings are intended for connection to conventional equipment for advancing the device and forming holes or bores in the ground. This equipment, not shown in the drawings, includes a hollow conduit, of which a part is shown in FIG. 1 and referenced 1. One end of the conduit 1 is connected to the device whereas the other end of the conduit is connected to a machine which functions to urge the conduit in a direction towards the bottom of the hole being formed and to rotate the head when forming a straight hole. The machine also functions to deliver pressure fluid to the device and to detect the position of the device in the ground and to send signals to machine operator responsible for causing the machine to carry out these and other machine functions.
The device illustrated in FIGS. 1 and 2 includes a substantially round cylindrical head 2 which is connected at its rear end to the conduit 1 and the front end of which, as seen in the forward drive direction of the device, is provided with a surface which is positioned obliquely to the longitudinal center axis of the head, and
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Jonsson Gunnar
Oden Anders
Diamant Boart Craelius AB
Kisliuk Bruce M.
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