The present invention relates to a method for drilling, particularly percussion or rotary percussion drilling, a hole in soil or rock material and fixing an anchorage in said hole, wherein a borehole is formed by a drill bit mounted on a drill rod assembly. The invention further relates to a device for drilling, particularly percussion or rotary percussion drilling, a hole in soil or rock material and for the production of an anchorage, wherein a borehole is formed by a drill bit mounted on a drill rod assembly.
In the context of the production of a hole or borehole in soil or rock material and the subsequent fixation of an anchorage or lining in the borehole, it is, for instance, known from WO 98/21439 and WO 98/58132 to introduce an envelope or jacket tube into the borehole during the drilling procedure, for instance percussion or rotary percussion drilling, whereupon, after the completion of the bore, part of the drill bit is optionally removed from the borehole together with the drill rod assembly, while the envelope tube remains within the borehole such that an anchor will subsequently be formed within the borehole by filling a curing mass into the same. According to the configuration set out in WO 98/58132, the drill rod assembly may be provided with additional ribs and grooves on its outer periphery so as to ensure an accordingly good anchoring effect in case the drill rod assembly remains within the borehole, which is subsequently filled. To further enhance the anchorage effect, it is, for instance, known from AT-U 5644 to bring the envelope tube into abutment on the inner wall of the borehole by widening its outer periphery.
Alternatively, it is known to remove the drilling tool together with the drill rod assembly from a borehole after the production of the borehole, whereupon a separate anchor or anchoring means is subsequently introduced into the borehole, as has, for instance, become known from EP-B 0 241 451, U.S. Pat. No. 4,490,074, DE-AS 21 05 888, U.S. Pat. No. 4,310,266 or EP-A 0 875 663. That known prior art involves the drawback that the borehole has to be made in a first method step, whereupon, after the removal of the drilling tool plus drill rod assembly, the anchoring device is introduced into the optionally very long borehole in a further method step, after which abutment on the borehole wall is accomplished by removing the respective holding device while widening the outer diameter. It is immediately apparent that not only an accordingly increased amount of time is required for the two separate operating steps, but that an optionally subsequent introduction of such an anchoring device of great length will entail problems. Furthermore, it is to be anticipated that the removal of the drilling device together with the drill rod assembly and the subsequent introduction of an anchoring device is feasible only in comparatively solid soil or rock, whereby it must be safeguarded that no material will, for instance, break into the borehole during the drilling procedure or after the removal of the drilling tool and prior to the final introduction of the anchoring device, which material would block the borehole so as to render the introduction of the anchoring device impossible.
The present invention aims to further develop a method and device of the initially defined kind to the effect that an anchorage to the inner wall of the borehole is achievable immediately after the completion of a borehole with a simplified overall construction and reduced time expenditure.
To solve these objects, the method according to the invention, departing from a method of the initially defined kind, is essentially characterized in that, after the completion of the borehole, a plurality of, in particular, wedge-shaped spreading elements arranged at a distance from the drill bit and oriented contrary to the drilling direction are extended into the wall of the borehole formed by the drill bit. By realizing, immediately after the completion of the borehole, an anchorage via, in particular, wedge-shaped spreading elements oriented contrary to the drilling direction, the additional operating step of separately introducing an anchorage into the completed borehole after the previous removal of the drill rod assembly and drilling tools can be obviated so as to achieve an accordingly large time saving. Moreover, the method according to the invention can be applied irrespectively of the soil or rock material to be drilled through, since an anchorage is effected in the borehole immediately after the formation of the borehole, so that even with loose rock, with which breaking in is to be eventually feared at least after the removal of the drilling tool and prior to the introduction of an anchorage, no difficulties need be feared as with anchorages to be produced subsequently. By extending or expanding the, in particular, wedge-shaped spreading elements oriented contrary to the drilling direction, the introduction of at least the tips of the spreading elements oriented contrary to the drilling direction will be immediately caused so as to provide an accordingly good anchoring effect immediately after the borehole has been completed.
To ensure particularly simple extending of the spreading elements after the completion of the borehole, it is proposed according to a preferred embodiment that the extension of the spreading elements is initiated and/or effected by a rotational movement of the drill rod assembly contrary to the direction of rotation for the production of the borehole by the drill bit. It is, thus, feasible to realize the production of a borehole in a conventional manner by percussion drilling or rotary percussion drilling, by providing a defined direction of rotation during the drilling procedure, whereupon, after the completion of the borehole, the extension of the spreading elements is initiated and/or effected by a rotational movement of the drill rod assembly contrary to the direction of rotation for the production of the borehole.
To enable the simple introduction of the spreading elements without interfering with the drilling procedure, it is provided according to a further preferred embodiment that the spreading elements are prestressed in the direction towards the drill rod assembly during the drilling procedure.
In order to enhance the anchoring effect and/or support the proper introduction of the spreading elements having, in particular, wedge-shaped tips extending contrary to the drilling procedure, it is proposed according to a further preferred embodiment that, during the emergence of the spreading elements, and/or alternatingly with the emerging movement of the same, the drill rod assembly is respectively powered or retracted in the direction towards the open end of the borehole, contrary to the drilling direction. The simultaneous and/or alternating pulling or powering of the drill rod assembly and, hence, of the spreading elements during the emerging movement causes the tips of the spreading elements to penetrate more deeply into the material so as to accordingly promote the anchoring effect.
After the spreading open or emergence of the spreading elements, an anchor element is formed via the drill rod assembly remaining in the borehole as well as the drill bit. If special demands are made on the anchorage, it is proposed according to a further preferred embodiment that, after the completion of the borehole and emergence or anchoring of the spreading elements, the drill rod assembly is subdivided, in particular, in the region of the spreading elements and removed from the borehole and replaced by an anchor element, in particular a cable strand anchor, which is connected, in particular screwed, with the drill rod assembly subportion remaining in the borehole. By subdividing the drill rod assembly as in accordance with the invention, and, hence, offering the chance of removing a subportion, it has become possible to replace the drill rod assembly upon completion of the borehole and emergence or anchoring of the spreading elements, by an appropriately specialized anchoring element, for instance a cable strand anchor, which is accordingly connected, for instance screwed, with the drill rod assembly subportion remaining in the borehole and with the drill bit.
To solve the objects set out in the beginning, a device of the initially defined kind is, moreover, essentially characterized in that, in a portion joining the drill bit, a plurality of, in particular, wedge-shaped spreading elements oriented contrary to the drilling direction are provided, which are extensible into the wall of the borehole after the completion of the borehole formed by the drill bit. The, in particular, wedge-shaped spreading elements oriented contrary to the drilling direction and emerging upon completion of the borehole allow for the immediate realization of a safe anchorage while achieving an accordingly large time saving.
For the reliable introduction of the spreading elements without interference with the drilling procedure, it is proposed according to a further preferred embodiment that the spreading elements are powered, particularly prestressed by at least one strap, in the direction towards the drill rod assembly during the drilling procedure.
For the reliable expansion of the spreading elements and introduction of an appropriate anchoring force or effect, it is proposed according to a further preferred embodiment that an, in particular, annular expansion element is mounted about the periphery of the drill rod assembly and, at a rotational movement of the drill rod assembly in a direction contrary to a rotational movement carried out during the performance of the drilling procedure, is displaceable in the direction towards the drill bit along the longitudinal direction of the drill rod assembly and cooperates with the wedge-shaped spreading elements, which are pivotally articulated to a bearing element which is, in particular, fixedly connected to the drill rod assembly and arranged between the expansion element and the drill bit.
As already indicated above, percussion or rotary percussion drilling is effected by a movement of the drill bit of the drill rod assembly in a predefined direction of rotation, wherein said direction of rotation of the drill rod assembly is reversed for the extension of the spreading elements. In order to avoid any interference with the drilling procedure and enable the spreading elements to be safely extended at a reversal of the rotational movement of the drill rod assembly after the completion of the borehole, it is, moreover, proposed that at least one spring element is provided on the expansion element, which spring element, during the drilling procedure, can be received in a recess or depression provided on the periphery of the expansion element and, at a reversal of the direction of rotation, cooperates with at least one profiling provided on at least one spreading element and oriented to the interior of the device, in order to prevent the expansion element from a rotational movement and cause its displacement along the longitudinal direction by the provision of a threaded connection, as in correspondence with a further preferred embodiment of the device according to the invention. The drilling procedure is, thus, realized in a manner that the expansion element is moved relative to spreading elements in the fashion of a ratchet, while the spring element, after a reversal of the direction of rotation, immediately cooperates with at least one profiling provided on at least one spreading element, in order to prevent a rotational movement of the expansion element, whereby the provision of an accordingly extending threaded connection effects a displacement of the expansion element in the longitudinal direction of the drill rod assembly and, in particular, in the direction towards the drill bit so as to allow the emergence of the wedge-shaped spreading elements extending contrary to the drilling direction.
In order to ensure an appropriate flushing effect even with the provision of expansion element surrounding the drill rod assembly, it is proposed according to a further preferred embodiment that at least one flushing channel extending in the longitudinal direction of the device is provided within the expansion element.
In order to ensure a uniform anchoring effect over the region of the borehole, it is, moreover, provided that the expandable spreading elements are arranged to be substantially uniformly distributed about the periphery of the drill rod assembly, as in correspondence with a further preferred embodiment of the device according to the invention. As a result, uniformly high anchoring forces will be introduced into the surrounding soil or rock material via the peripheries of the borehole and drill rod assembly.
In addition to such a homogenization of the forces to be introduced, via the periphery of the device according to the invention, it may be provided, in order to further increase the anchoring forces to be introduced, that a plurality of expandable spreading elements are provided about the periphery of the drill rod assembly at different distances from the drill bit, as in correspondence with a further preferred embodiment of the device according to the invention. Such expandable spreading elements arranged at different distances from the drill bit provide an accordingly safe anchorage over an enlarged length and, in particular, in the front region of the device according to the invention, during the expansion of the expandable spreading elements, so that at least some of the spreading elements arranged at different distances from the drill bit and additionally distributed about the periphery of the device according to the invention will ensure a safe and reliable anchorage even in the event of possibly loose rock.
In order to further homogenize the anchoring effect via the periphery as well as a longitudinal extension of the device according to the invention, it is proposed according to a further preferred embodiment that spreading elements arranged at different distances from the drill bit are arranged to be relatively offset in the peripheral direction of the drill rod assembly.
In order to facilitate the extension procedure of the individual spreading elements, which, according to a preferred embodiment, are arranged at different distances from the tip of the borehole or drill bit, respectively, it is proposed according to a further preferred embodiment that spreading elements arranged at different distances from the drill bit cooperate with a common expansion element arranged to be displaceable along the drill rod assembly.
Instead of forming an anchor by the drill rod assembly remaining in the borehole as well as by the drill bit, it is proposed according to a further preferred embodiment that the drill rod assembly is divisible into subportions, particularly in the region of the spreading elements, and an anchor element, in particular a screw head of a cable strand anchor, is connectable with the drill rod assembly subportion remaining in the borehole and connected with the drill bit. It will thereby be possible, upon completion of the borehole and anchorage or emergence of the spreading elements, to introduce anchoring elements adapted for special anchoring effects, in particular a cable strand anchor, which is particularly easy to connect with the drill rod assembly subportion remaining in the borehole.
In order to ensure an appropriate flushing effect, it is, moreover, preferably provided that the drill rod assembly, in a manner known per se, is formed with a flushing channel in its interior. Such a flushing channel cannot only be used to introduce flushing fluid during the drilling procedure, but can optionally also be employed to introduce a curable material, which is to be introduced in the region of the tip and/or in the region of the spreading elements.
In the following, the invention will be explained in more detail by way of an exemplary embodiment schematically illustrated in the accompanying drawing. Therein,
In
At a distance from the drill 2, a fixed nut 5 is provided on the drill rod assembly 3, consecutively to which a plurality of wedge-shaped spreading elements 7 oriented in a direction extending opposite the drilling direction 6 are arranged in a manner distributed about the periphery of the drill rod assembly 3. During the drilling procedure illustrated in
After the completion of the borehole 1, with the drill bit 2 being, for instance, rotated in a counter-clockwise direction in the sense of arrow 9 in
In order to promote or enhance the anchoring effect, it may be provided that either simultaneously with the movement of the expansion element 10 and, hence, extension of the spreading elements 7 into the surrounding borehole wall 1, a tensile stress is exerted on the drill rod assembly 3 in a sense opposite to arrows 6 and 14 so as to cause the tips 15 of the wedge-shaped spreading elements 7 to dig their way, or eat, (more) deeply into the surrounding borehole wall 1.
In order to ensure proper haulage of the excavated material and provide an appropriate flushing action, at least one flushing channel 16 is, moreover, indicated within the expansion element 10 in
As is apparent from
Depending on the anchoring effect to be achieved and/or the nature of the surrounding soil or rock material, the spreading elements 7 are accordingly arranged about the periphery of the drill rod assembly 3 in terms of length, configuration, biasing force and number.
In the embodiment illustrated in
While, in the embodiment according to
Similarly to the preceding embodiment, drilling is, for instance, effected by a movement of the drill rod assembly 3 in an anti-clockwise direction, while, after the completion of the borehole 1, by a reversal of the direction of rotation of the drill rod assembly 3, the extension or extraction of the spreading elements 17 and 18 is again ensured by the respective engagement of a spring element 12, which causes a displacement or shift of the expansion element again denoted by 10, in the direction towards the drill bit 2, as is indicated in
In the embodiment illustrated in
From the embodiment according to
After the completion of a bore and the emergence of at least some spreading elements, as is indicated in
Number | Date | Country | Kind |
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A 912/2005 | May 2005 | AT | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/AT2006/000216 | 5/26/2006 | WO | 00 | 11/27/2007 |