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Publication numberUS3905431 A
Publication typeGrant
Publication dateSep 16, 1975
Filing dateOct 1, 1973
Priority dateOct 2, 1972
Also published asDE2343079A1, DE2343079C2
Publication numberUS 3905431 A, US 3905431A, US-A-3905431, US3905431 A, US3905431A
InventorsHasewend Florian
Original AssigneeBoehler & Co Ag Geb
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Earth boring method and apparatus
US 3905431 A
Abstract
Earth boring process and apparatus in which a dam or the like is first bored through in a substantially horizontal direction, after which the leading first borehead used for the first boring is removed from the borestring and is replaced by a second drilling borehead having a larger diameter, the second borehead then being pulled in the opposite direction through the bore hole, so as to enlarge it. During both boring operations the respective boreheads are both turned and percussed or impacted.
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Description  (OCR text may contain errors)

United States Patent 11 1 3,905,431

Hasewend Sept. 16, 1975 EARTH BORING METHOD AND 2,684,834 7 1954 Miller et a1. 175 53 2,839,271 6/1958 Kandle 175/53 2,928,468 3/1960 Wienands 175/53 X Inventori Florian Hasewend, Kapfenberg, 3,182,732 5/1965 Earnest 175 62 Austria 3,507,342 4/1970 Hasewend et a1. 175/62 19 [731 Assignee: Gebr. Bohler & C0. 1651372 3/ Smlth 175/62 x Aktlengesellschaft, V1enna, Austna Primary Examiner Frank L Abbott [22] Filed: Oct. 1, 1973 Assistant Examiner-Richard E. Favreau Appl, No.: 402,200

Foreign Application Priority Data Oct. 2, 1972 Austria 8425/72 U.S. Cl. 175/53; 175/62; 175/405 Int. Cl. E2lc 23/00 Field Of Search 175/53, 62, 406, 407, 405

References Cited UNITED STATES PATENTS Elliott 175/53 X [5 7] ABSTRACT 5 Claims, 2 Drawing Figures EARTH BORING METHOD AND APPARATUS The bore hole is enlarged by boring with this larger borehead in the opposite direction.

It is known to bore a hole into soft material such as soil by means of a purely rotary boring with a leading borehead, in one direction carrying out a pre-boring and thereafter, also by pure rotary boring in the opposite direction with a borehead having a larger outer diameter than the previously used borehead, to continue the boring operation. One such arrangement is shown, e.g., in US. Pat. No. 2,928,468, issued to H. Wienands on Mar. I5, 1960.

It is furthermore known to push into the soil a cable which is partially driven by means of rollers and which is under tension and to enlarge the thus created hole by means of a helically shaped borer. Both of the aforedescribed processes have the drawback of not being suitable for producing holes in loose or solid rock.

It is an object of this invention to avoid the aforedescribed drawback and to provide a process which can, in a simple and economical manner, create bore holes having relatively large diameters in loose or solid rock in a substantial horizontal direction. In accordance with the invention the boring process of the aforedescribed type achieves this results in that during boring the leading borehead which is formed as a percussion bore crown as well as the percussion bore crown which is formed as a drill borehead are not only rotated but also are percussed or pounded.

Hereafter there is described the process in accordance with the invention in conjunction with a drawing in which there is illustrated schematically an arrangement for earring out the process.

In the drawing:

FIG. 1 is viewed partly in section and partly in eleva tion showing the aforementioned arrangement with the first smaller leading borehead formed as a percussion bore crown, and

FIG. 2 is a partial side view of the same arrangement wherein a second larger drilling borehead is formed as a percussion bore crown.

Referring now to the drawing, the drill string or pipe string which carries the first, smaller leading borehead 2 consists of pipes I screwed into each other and secured to a percussion boring machine 4 of a known type having its own rotary mechanism 5. This pipe string is driven in a substantial horizontal direction by the percussion boring machine 4 while pipes l are added as needed. The bored material or detritus travels through the ring shaped leading borehead 2 as well as the pipe sections 1 in the direction of the ejection bell 6 which is provided at the percussion bore machine 4 and is conducted by laterally disposed openings 7 into the open. Assume (as is illustrated in FIG. 1) the leading borehead 2 has bored through the dam, borehead 2 is removed from the borestring and is replaced by a ring shaped driven borehead 8 which has a substantially larger diameter. The cutting edges 8' of the driven head 8 are directed towards the ejecting bell 6. On the side of drilling borehead 8 which faces away from the percussion boring machine 4 a pipe section 9 as well as a second ejection bell 10 are screwed into each other. They are also loosely connected with a second percussion mechanism 11. Thereafter the enlarging boring operation is carried out whereby on one side of the drilling borehead 8 pipe sections 1 are removed at all times and on the other side there is added an equally long pipe section 9. The borestring and leading borehead 2, as well as the drilling borehead 8, are turned by the rotary mechanism 5 of the percussion bore machine 4. The forward and retracting sliding of the borestring is carried out by means of the bore carriage 3 on which the percussion boring machine 4 is mounted. When the force is exerted by the boring carriage 3 is not sufficient to obtain the desired boring output, then there are mounted on to the second percussion mechanism 1 1 an additional rotary and pushing motor. After the drilling head 8 has issued from the side of the darn facing the percussion boring machine 4, the drilling head 8, ejection bell l0 and percussion means 11 are replaced by means of a connection piece to a known pulling arrangement, by means of which there is inserted a supply conduit, for example a plastic pipe, into the thus formed bore in the earth.

In accordance with the process of this invention the possibility exists to produce even larger bore holes if in accordance with the aforedescribed boring pr) cess the respective bore hole is drilled with a drill head 8 of a larger diameter, such a drill head being moved away from the bore carriage 3.

In comparison to known boring processes the boring process of this invention has the advantage of carrying out in a simple and economical manner in loose as well as solid rock a substantially horizontal bore hole having relatively large diameter.

Although the invention is illustrated and described with reference to one preferred embodiment thereof, it is to be expressly understood that it is in no way limited to the disclosure of such a preferred embodiment, but

is capable of numerous modifications within the scope of the appended claims.

What is claimed is:

1. A process for boring holes of relatively large diameter through a darn or the like in rocky terrain, comprising the steps of first boring through the dam in a substantially horizontal direction with a first leading borehead by rotating said first borehead while simultaneously pushing it forwardly under a rapidly repetitive horizontal impact, then replacing the first borehead by a second drilling borehead having a larger diameter than the first borehead and then boring in the opposite direction through the first borehole with the second borehead by rotating said second borehead while simultaneously pushing it rearwardly under a rapidly repetitive horizontal impact, whereby the first borehole is enlarged. I

2. Apparatus for drilling a horizontal bore in a dam or the like in rocky terrain, comprising a first bore string consisting of pipe sections screwed to each other and having a first ejection bell with outlet openings adjacent the rear end of the first bore string, a borehead removably screwed on the forward end of the first bore string, said borehead being selectively a first leading borehead and a second larger ring-shaped drilling borehead, the cutting edges of the first leading borehead facing forwardly and the cutting edges of the second borehead facing rearwardly, a first percussion bore maejection bell.

4. Apparatus according to claim 3, further comprising a second bore string insertable between the second drilling borehead and the second ejection bell, the length of the second bore string being equal to the length of the first bore string.

5. Apparatus according to claim 3, wherein the second percussion bore machine includes an additional rotating and percussion motor.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2349033 *Jun 25, 1940May 16, 1944Elliott Nathaniel RBoring head
US2684834 *Oct 7, 1950Jul 27, 1954John OsbornHorizontal boring machine
US2839271 *May 2, 1955Jun 17, 1958Kandle Charles WTunneling machine
US2928468 *Mar 22, 1955Mar 15, 1960Mannesmann AgMethod for boring wells
US3182732 *Jul 23, 1962May 11, 1965Earnest J THorizontal earth boring machine
US3507342 *Feb 27, 1967Apr 21, 1970Boehler & Co Ag GebMethod and apparatus for drilling through soil and rock layers
US3651872 *Jul 13, 1970Mar 28, 1972Koen A DMethod of and apparatus for boring holes under streets, highways or the like
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4117895 *Mar 30, 1977Oct 3, 1978Smith International, Inc.Apparatus and method for enlarging underground arcuate bore holes
US4249620 *May 9, 1979Feb 10, 1981Paul SchmidtMethod of boring holes which are open at both ends in the ground
US4694913 *May 16, 1986Sep 22, 1987Gas Research InstituteGuided earth boring tool
US4858704 *Sep 9, 1987Aug 22, 1989Gas Research InstituteGuided earth boring tool
US4867255 *May 20, 1988Sep 19, 1989Flowmole CorporationTechnique for steering a downhole hammer
US5176211 *Sep 16, 1991Jan 5, 1993Baker Energy Resources CorporationApparatus and method for recirculating mud when drilling under an obstacle
US5301758 *Dec 23, 1991Apr 12, 1994Terra Ag Fuer TiefbautechnikMethod and apparatus for enlarging a bore hole
US5314267 *Aug 27, 1992May 24, 1994Mark OsadchukHorizontal pipeline boring apparatus and method
US5386878 *Apr 29, 1994Feb 7, 1995Uti Energy Corp.Rock boring process and apparatus
US5427475 *Feb 22, 1994Jun 27, 1995Coss; Timothy R.Trenchless pipeline installation method and apparatus employing corrective alignment of pilot hole
US5979573 *May 13, 1997Nov 9, 1999Ozzie's Pipeline Padder, Inc.Horizontal boring apparatus
US5979574 *Feb 4, 1998Nov 9, 1999Ozzie's Pipeline Padder, Inc.Horizontal boring apparatus and method of using the same
US6227311Nov 8, 1999May 8, 2001Ozzie's Pipeline Padder, Inc.Drill pipe guiding apparatus for a horizontal boring machine method
US6808030 *Sep 23, 2002Oct 26, 2004Klemm Guenter WEnlargement drilling system
WO1995022711A1 *Feb 22, 1995Aug 24, 1995Timothy R CossTrenchless pipeline installation method with pilot hole corrective alignment
Classifications
U.S. Classification175/53, 175/405, 175/62
International ClassificationE21B7/04, E21B7/00, E21B7/28
Cooperative ClassificationE21B7/046, E21B7/28
European ClassificationE21B7/04B, E21B7/28