DE2343079A1 - DRILLING METHOD AND DEVICE FOR ITS IMPLEMENTATION - Google Patents

Description

Gebr. Böhler & Co _P Aktiengesellschaft _s Vienna

Drilling method and performance for his execution

The invention relates to a drilling method _P in which a dam or the like is drilled through essentially in the horizontal direction, after which the pre-boring head used for this is removed from the drill string and replaced by a boring head having a larger diameter than the pre-boring head and by drilling with the same in the opposite direction the borehole is drilled, and a device for carrying out this method.

It is known to _{pre-drill a hole in soft material 3} such as soil by pure rotating drilling with a pre-drilling head in one direction and then also to drill open by pure rotating drilling in the opposite direction with a drilling head having a larger outer diameter than the same.

It is also known to push a tensioned rope running over partly driven rollers into the ground and to enlarge the hole thus produced by means of a worm-shaped drill surrounding the rope.

The two methods just described have the disadvantage

409816/0322

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that they are not suitable for "holes in loose or tight To manufacture rock.

The invention has the object zugrunde- to avoid the drawback mentioned and rfahren Ve-a to provide it in a simple and rational way allows _r in loose or solid rock approximately horizontally extending holes with relatively large diameters to manufacture. According to the invention, this is with a B-. rr / experience of the type mentioned at the outset is achieved by the fact that in the case of B: r ,: v \ -n both the Vcrb - :. hrk-: pf designed as a percussion drill bit as well as the A ^ fb: nrk ~ designed as a percussion drill bit pf not only rotated, but also beaten,

In the following, the method according to the invention will be shown in detail on a device which is used to carry it out and is shown schematically in the drawing. Fig. 1, the just mentioned apparatus with a percussion drill bit constructed as Vorbohrkopf 2 in view, and Fig. 2 shows the same device but with an ;, formed as a percussion drill Aufbohrkopf _P 8 partly in elevation and partly in longitudinal section.

The one carrying the drilling head 2 at one end, from one another Pipe string consisting of screwed pipe sections 1 is better known on a hammer drill 4 which has its own rotating mechanism 5 Type and is fastened by this in an approximately horizontal direction, with the addition of pipe sections 1, advanced. Hiebei the cuttings migrate through the ring-shaped pre-drilling head 2 as well the pipe sections 1 in the direction of the ejection bell provided on the hammer drill 6 and is arranged by its laterally Opening 7 led to the outside. As soon as (as shown in Fig. 1) the pre-drilling head 2 has pierced the dam in question,

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it is removed from the drill string and replaced by an annular boring head 8 having a substantially larger diameter than it. Blows! the cutting edges are 8 ^! of the boring head 8 facing the ejection bell 6 «, on the side facing away from the hammer drill 4, the boring head 8 _f a pipe section 9 and a second ejection bell 10 are screwed together. This is loosely connected to a second hammer mechanism 11, then the expansion drilling takes place, with a pipe section 1 removed on one side of the opening 8 and a pipe section 9 of the same length being added on the other side, drill string and pre-drill head 2 or boring head 8 are rotated by the rotary mechanism 5 of the hammer drill. The advance or retraction of the drill string is carried out by means of the drill carriage 3 on which the hammer drill 4 is located. If the forces exerted by the drilling carriage 3 are not sufficient to achieve the desired drilling performance, a rotary and feed motor (not shown) is additionally attached to the second hammer mechanism 11. After the boring head 8 emerges on the side of the dam facing the hammer drill 4, boring head 8, ejection bell 10 and hammer mechanism 11 are replaced by a connecting piece and a known retraction device. Through this a supply line, z. B. a plastic tube introduced.

It is possible to produce _s by the inventive method even more wells, when, after the above beschriebenenBohrvorgang the borehole in question with a greater diameter than the Aufbohrkopf 8 having, moved away from the drilling head 3 Drilling is further drilled.

THE END

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Compared to the known drilling method, the method according to the invention has the advantage that it can be used in a simple and ra tional way is possible in loose or solid rock approximately produce horizontally extending boreholes with relatively large diameters.

GebroBöhler & Co Aktiengesellschaft patent office

ORIGINAL INSPECTED 409816/0322

Claims (5)

5 - F 1464 2343 .Bohrverfahren in which a dam od "the like. _S is pierced substantially in the horizontal direction according to which the therefor Vorbohrkopf used is replaced by the drill string removed and replaced with a larger diameter than the Vorbohrkopf having Aufbohrkopf and by drilling with the same in the opposite direction the borehole is laid out, characterized in that during drilling both the pre-drill head designed as a hammer drill bit and the drill head designed as a hammer drill bit are not only rotated but also hammered. 2. Apparatus for performing the method according to claim 1, with a pipe sections and screwed together an ejection bell provided with outlet openings, at the end of which is remote from the ejection bell The pre-boring head and boring head can be screwed alternately, characterized in that the pre-boring head (2) and boring head (8) Percussion bits are, the cutting of the pre-drilling head (2) facing away from the ejection bell (6) and in a known manner the cutting edges (8 ') of the annular boring head (8) in itself are facing the ejection bell (6) in a known manner and that a hammer drill preferably having its own rotating mechanism (5) (4) is provided to which the drill string can be attached in a manner known per se. 3. Apparatus according to claim 2, on both sides of the boring head Has pipe sections as well as devices acting on the same, characterized in that the on the hammer drill (4) Facing side existing facility of 409816/0322 F 1464 2 Y Λ 3 ΰ 7 9 a second ejection bell connected to the boring head (β) ± est (10) and a second striking mechanism (11) loosely connected to it is formed. 4. Apparatus according to claim 3 _9, characterized in that the lengths of the additional pipe sections (9) which can be inserted between the boring head (8) and the second ejection bell (10) are the same as those of the pipe sections (1) arranged on the other side of the boring head (8) . 5. Apparatus according to claim 3 or 4 _9, characterized in that an additional rotary and percussion motor is attached to the second hammer mechanism (11). Gebr.Böhler & Co Aktiengesellschaft patent office 409816/0322