KR20080038341A - Method and device for releasing a block on a bore-crown during a boring process - Google Patents

Abstract

The invention relates to a method and a device for releasing a block on a bore-crown (1) during a boring process, especially percussion boring or rotary percussion boring, for boring holes in the ground or rock, whereby a borehole is formed by a bore-crown (1) mounted on a boring rod (2) and connected thereto and acted upon by the boring rod to generate a rotational movement and optionally a percussive movement. According to the invention, when the bore-crown (1) is blocked, preventing the continuation of the boring process and especially another rotational movement of the bore-crown (1), the bore-crown (1) is subjected to a linear movement in the opposite direction to the boring direction by means of the boring rod (2), and to a rotational movement in a direction opposing the direction of the rotational displacement during the boring process by means of a corresponding connection (7, 9) between the end of the boring rod (2) facing the bore-crown (1), and the bore-crown (1), independently of a rotary drive for carrying out the boring process. As a result the borehole can be bored in a simple manner after releasing the block on the bore-crown (1).

Description

METHODS AND DEVICE FOR RELEASING A BLOCK ON A BORE-CROWN DURING A BORING PROCESS}

The present invention confines a bore-crown or drill bit during drilling, particularly percussion drilling or rotary impact drilling or boring, in a soil or rock material. (Iii; a method of releasing blockage, wherein a borehole is mounted and connected to a drill rod assembly or a boring rod and is operated by the drill rod assembly to effect rotational movement and optionally to impact ( percussive) is formed by a moving drill bit. The invention also relates to a device for uncloging a drill bit during drilling, in particular impact drilling or rotary impact drilling, in a soil or rock material, wherein the trill bit is mounted to a drill rod assembly and such a drill It is actuated by a rod assembly to rotate and optionally to impact to form a borehole.

In the field of forming boreholes in soil or rock material by impact drilling or rotary impact drilling, due to the forces and vibrations that occur during drilling, especially in soil in rock layers or grounds displaceable or movable relative to one another, Jamming, blocking, or seizing of the drill bit may occur due to movement or displacement of the rock layer in the borehole. In such a case, the rotational drive of the drilling or boring device for forming the bore does not generally have a sufficient size to overcome the forces generated during the movement of the rock layer, thus reducing the blockage of the drill bit. It must be released again. In the most preferred case, if a blockage of the drill bit is issued, it will be possible to separate at least the drill rod assembly from the drill bit remaining in the incomplete borehole so that at least the drill rod assembly can be reused when performing a new drilling procedure. In less preferred cases, the drill rod assembly also remains in the incomplete borehole, thus requiring much time to create a new bore that must be positioned substantially adjacent to the incomplete borehole to obtain the required strength characteristics, and also in the borehole. Residual drill rod assemblies will consume a lot of cost and material, and in any case the drill bit will have to remain in the borehole.

The invention does not require any additional time, cost and material to form a new bore, as well as allow for the completion or progression of simple boreholes in incomplete boreholes after releasing said blockage of drill bits. It is an object of the present invention to provide a method and apparatus for releasing a blockage of a drill bit during a procedure.

In order to achieve the above object, a method of the type defined above is provided which faces the drill bit, in the case of the blockage of the drill bit or bore-crown, which impedes the progress of the drilling process and in particular further rotational movement of the drill bit. Through an appropriate connection between the end of the drill rod assembly and the drill bit and independent of the rotational drive for the execution of the drilling process, the drill bit is linearly moved opposite the drill direction through the drill rod assembly, and also the direction of rotational movement during the drilling process. It is an intrinsic feature that it is rotated in a direction opposite to. According to the invention, in the closing of the drill bit, through the drill rod assembly, the drill bit not only linearly moves in the opposite direction of the drill direction, but also rotates during the drilling process, irrespective of the rotational drive, which is generally insufficient in strength as described above. Due to the fact that it rotates in a direction opposite to the direction, it will be possible to remove or release the blockage or jamming of the drill bit by at least partially retracting the drill bit against the simultaneous attainment of the rotational motion and the direction of drilling. After releasing the blockage or blockage of the drill bit, it may be possible to continue or complete the drilling process of the incomplete borehole interrupted by the blockage. In this specification, it can be expected that the linear drive is strong enough to exert a sufficiently large extraction force on the drill rod assembly and thus on the drill bit in the opposite direction of the drilling, thereby This may result in loosening of the drill bit along the linear direction. By additionally providing a suitable connection between the drill rod assembly and the drill bit, the drill bit will also be subjected to a rotational movement opposite to the direction of rotation for carrying out the drilling process, thus for example by slight movement of adjacent rock layers. Allows the drill bit to be separated from the caused blockage or blockage. In addition, by providing a rotational motion opposite to the rotational direction for carrying out the drilling process, it can be ensured that the drill bit does not escape from the drill rod assembly, and upon the release of the blockage of the drill bit, the drilling process will continue immediately. Could be.

To provide a particularly simple and reliable connection, the drill bit and the end of the drill rod assembly facing the drill bit, in accordance with a preferred embodiment, in order to simultaneously achieve a rotational movement during the extraction force on the drill rod assembly. The connection therebetween is implemented by an adapter, the adapter comprising one or more helical or vortex depressions or flats or lifts, and complementary profiling provided on the drill bit, the helical or vortex The depressions or flats or lifts have a large slope or pitch with respect to the longitudinal axis of the drill rod assembly. By providing a large pitch or inclination with respect to the longitudinal axis of one or more helical or vortex connections or profiling, when a large extraction force is applied to the drill rod assembly as opposed to the drilling direction, a rotational motion opposite to the direction of rotation during the drilling process is achieved. You may be able to apply the appropriate force to acquire.

To achieve a correspondingly high force for releasing the drill bit or to obtain a rotational movement for loosening and to distribute it appropriately over the outer circumference of the end of the drill rod assembly and / or adapter facing the drill bit To this end, according to a further preferred embodiment, a plurality of spiral or vortex connections or profiling can be provided that are uniformly aligned along the perimeter of the end facing the drill bit, wherein the end is a complementary recess of the drill bit. It is housed in a complementary recess or pocket hole.

In particular, in order to avoid excessive friction in the connection area between the drill rod assembly and / or the adapter and the drill bit during the movement to unblock the drill bit, according to a further preferred embodiment, the drill rod assembly or the adapter and the drill Simple pointwise coupling at several sites in the profiling region between bits is provided. The pointed coupling at several such sites will be able to sufficiently transfer the forces required for the simultaneous achievement of rotational and linear extraction movements as opposed to the direction of rotation during the drilling process and for example the connection between the drill bit and the drill rod assembly. It enables the simultaneous achievement of rotational movement and linear extraction movement by excessive frictional force in the area.

In order to achieve the object as described in the introduction, a device of the initially defined type is provided with at least one spiral or vortex connection between the drill bit and the end of the drill rod assembly facing the drill bit, the connection being In addition to the linear motion opposite to the drilling direction in closing of the drill bit for retracting the drill rod assembly against the drilling direction, it acts on the trill bit and is independent of the rotational direction during the drilling process independently of the rotational drive for the implementation of the drilling process. Perform a rotary motion. As already explained, in order to release the blockage or blockage of the drill bit, suitable members are provided in a simple and reliable manner to simultaneously carry out the rotational movement and the linear extraction movement as opposed to the rotational movement when performing the drilling process. Could be.

In order to achieve an accurate embodiment that can be simply implemented, one or more helical or spiral connections are provided on recesses or raised or flat portions provided on adapters aligned between drill bits and drill rod assemblies, and on drill bits. It may consist of complementary profiling provided.

In order to ensure uniform introduction of forces that may optionally be large forces, according to a preferred embodiment a number of helical or spiral connections or profiling may be provided between the drill rod assembly or adapter and the drill bit. The connections or profilings may each be aligned at equal intervals.

Further, in order to reliably transfer simultaneously acting extraction forces and rotational movements from the drill rod assembly to the drill bit, one or more helical or vortex connections or profiling, as in a further preferred embodiment of the device according to the invention, It may have a large slope or pitch with respect to the longitudinal axis of the drill rod assembly.

As mentioned above, the introduction of excessive friction forces between the drill rod assembly and / or the adapter and the drill bit is avoided as much as possible. In this specification, in accordance with a further preferred embodiment, a number of substantially point-to-point cooperating with the helical or vortex recess (es) or recess (es) on the end of the adapter facing the drill bit. shaped or hemispherical lift is provided in the pocket hole of the drill bit.

In order to distribute the force evenly over the entire circumference of both the drill bit and the drill rod assembly or the adapter, according to a further preferred embodiment, a plurality of adjacent helical flats are respectively provided around the outer circumference of the adapter or the drill rod assembly and complementary Typical flats are provided in the pocket holes of the drill bit, the flats having a polygonal, eg hexagonal cross-sectional appearance. Such spiral polygons are easy to design and at the same time provide a reliable coupling.

For reliable cooling and / or flushing of the adapter and / or drill bit during the drilling process, cooling fluid or flushing fluid into the outlet channel or hole of the adapter and / or drill bit, inside the adapter and / or drill rod assembly A passage channel is provided for supplying the, and as corresponds to a further preferred embodiment of the device according to the invention, such passage channel is connected to the peripheral surface of the adapter and / or the working face of the drill bit.

In order to reliably transport the material excavated during the drilling process, and thus further reduce the chance of blockage or blockage of the drill bit during the implementation of the drilling process, in accordance with a known manner, A recess or recess and / or passage opening may be provided around the outer periphery of the drill bit to remove material excavated through the annular space between the outer perimeter of the drill rod assembly.

Hereinafter, the present invention will be described in more detail with reference to exemplary embodiments schematically illustrated in the accompanying drawings.

1 is a plan view of a drill bit of an apparatus according to the invention for practicing the method of the invention.

FIG. 2 is a rear view of the drill bit shown in FIG. 1.

3 is a cross-sectional view taken along line III-III of FIG. 1.

4 is a cross-sectional view taken along the line IV-IV of FIG. 1 similar to FIG. 3.

5 is a side view of a first embodiment of an adapter used between the drill rod assembly and the drill bit according to FIGS. 1 to 4.

FIG. 6 is a side view similar to FIG. 5 showing a side view of an improved embodiment of the adapter used between the drill rod assembly and the drill bit. FIG.

FIG. 7 is an enlarged view of the sectional view taken along the line VIII-VIII of FIG. 6.

1 to 4, it can be seen that the adapter 3 is provided between a drill bit or bore-crown as indicated by reference numeral '1' as a whole and a boring rod or drill rod assembly as indicated by reference numeral '2' as a whole. The drill rod assembly 2 is connected to the adapter 3 via a screw connection schematically indicated by the reference '4', and the adapter 3 is shown separately in FIG.

In particular, as is clearly shown in FIG. 5, around the outer periphery of the adapter end 6 facing the drill bit 1, the adapter 3 is relative to the longitudinal axis indicated with reference numeral 8 in FIG. 3. It includes a spiral or vortex depression 7 with an inclined or large pitch. Spiral or vortex depressions or connections or profilings 7 provided on the outer periphery of the adapter 3 end 6 cooperate with the point-shaped or hemispherical rise 9 of the drill bit. The risers are shown in more detail in FIGS. 3 and 4, wherein the risers provide for reliable securing of the drill bit 1 to the adapter 3 and thus to the drill rod assembly 2. Make it possible.

For example, if a blockage of the drill bit 1 occurs during the drilling process caused by the movement or displacement of the rock layer in the area of the drill bit 1, if the continuation of the drilling process is thus interrupted, the drill The rod assembly 2 and thus the adapter 3 and the drill bit 1 are linear extraction movements in the direction of the arrow 10 in the direction of movement opposite to the general drilling or mining direction. )do.

Spiral or vortex recess 7 provided on the adapter 3 or on the end 6 of the adapter facing the drill bit, and the pocket of the drill bit for receiving the free end 6 of the adapter 3. By cooperation of the respective risers 9 provided inside the holes 11, the rotational movement of the drill bit 1 along the helical or vortex connection or depression 7 is dependent upon the provision of the extraction movement 10. At the same time, thereby enabling the release or loosening of the drill bit 1 blockage by the linear extraction and simultaneous rotational movements of the drill bit 1. Thus, after the drill bit 1 has been loosened, via an adapter 3 interposed by known drive means which are coupled in a known manner to the end of the drill rod assembly 2 projecting out of the borehole. In this way, it is possible to immediately continue the drilling process by appropriate action on the drill rod assembly 2 and thus on the drill bit 1.

In order to provide an adequate cooling or flushing effect, both the drill rod assembly 2 and the adapter 3 also have passage channels, denoted by the numerals '12' and '13', respectively, which passage channels Each outlet channel or hole 14 of the bit 1 is opened, which in turn is connected to the working face 15 of the drill bit 1. In addition, the adapter 3 is provided with an outlet channel 16 starting from the passage channel 13, to facilitate haulage of the excavated material.

In addition, a passage opening 17 is provided around the outside of the drill bit 1 to remove the excavated material from the working face 15 region of the drill bit 1. In addition, a suitable recess 18 is provided around the outside of the drill bit 1 to reliably remove material from the area of the working face 15 of the drill bit 1.

Instead of the embodiment shown in FIGS. 1 to 5 comprising a plurality of connecting members formed by the depression 7 and the riser 9 and distributed in the circumferential direction, one connection may be possible, and one such The connection will impart proper rotational movement along the direction opposite to the direction of rotational movement during the drilling process when a linear extraction movement is performed opposite to the drilling direction of the drill bit 1.

Instead of providing a helical or vortex depression 7 at the adapter 3 or the end 6 of the adapter, the corresponding profiling provided around the end of the adapter 3 and in particular a suitable depression in cooperation with the riser A portion or groove may be provided in the drill bit 1 or the pocket hole 11 of the drill bit.

Instead of the adapter 3 shown in the figure, the end of the drill rod assembly 2 facing the drill bit is directly in the form of a helical or vortex depression 7 or rise in cooperation with the corresponding profiling of the drill bit 1. By providing, it will be possible to prevent the additional manufacturing cost for the adapter (3).

However, when using the adapter 3, in particular the conventional design of the drill rod assembly 2 will work well, and thus the drill rod assembly 2 to achieve a simple release of the blockage of the drill bit 1. It will not be necessary to provide a special embodiment of. Due to the nature of the soil or rock material being bored, if a drill bit or blockage of the drill bit due to displacement or movement is concerned, providing a matching drill bit 1 and an adapter 3 The drill rod assembly 2 can be used to immediately carry out the drilling process, thus eliminating the need to manufacture a particular drill rod assembly member and thus facilitating stock-keeping. There will be.

From the embodiment shown in FIGS. 6 and 7 of the adapter, which is also indicated by reference '3', a number of spirals on the end (not specifically shown) where the adapter is indicated by reference '6' and facing the drill bit Or it may be confirmed that it may be provided with a spiral flat portion 19, it can be seen that the flat portion can form a polygonal, in particular hexagonal appearance when viewed in cross-section as shown in particular in Figure 7 . The pocket hole 11 (specifically) of the drill bit by providing such a spiral or vortex flat 19 on the end 6 of the adapter 3 and with each complementary flat forming a polygonal contour. 6 and 7 at the time of extraction of the drill rod assembly and adapter 3 in order to loosen the stuck drill bit 1 so that the borehole can be completed. For drill bits not shown, rotation in the direction opposite to the drilling direction will be imparted.

Instead of the hexagonal appearance of the helical polygons shown in FIGS. 6 and 7, a modified polygonal contour, including for example 4, 5, 7, or more elevations, may of course be employed.

6 and 7, it can be seen that adjacent flat portions 19 can each be connected by rounded areas 20, which are rounded at the cylindrical end 6 of the adapter 3. It can be seen that formed by the outer circumference of the.

Claims (12)

A method of releasing the obstruction of a drill bit (1) during drilling, in particular impact drilling or rotary impact drilling, in a soil or rock material, wherein a borehole is mounted and connected to the drill rod assembly (2) and the drill rod A method of uncensoring a drill bit, which is formed by a drill bit (1) actuated by the assembly (2) to effect a rotational movement and to selectively impact. The end of the drill rod assembly 2 facing the drill bit 1 and the blockage of the drill bit 1 which impede the progress of the drilling process and in particular the further rotational movement of the drill bit 1 Through an appropriate connection between the drill bits 1 and independent of the rotational drive for execution of the drilling process, through the drill rod assembly 2, the drill bit 1 is linearly moved in the opposite direction of the drill direction and also drilled. Method for releasing the drill bit, characterized in that the rotary motion in the direction opposite to the rotational motion direction during the process. The method of claim 1, The connection between the end of the drill rod assembly 2 facing the drill bit 1 and the drill bit 1 is realized by an adapter 3, which adapter is one or more helical or spiral depressions or flats. A portion 19 or riser 7 and complementary profiling 9 provided on the drill bit 1, wherein the spiral or vortex depression or flat portion 19 or riser ( 7) characterized in that it has a large inclination or pitch with respect to the longitudinal axis of the drill rod assembly (2). The method of claim 2, The plurality of helical or vortex profilings 7, 9, 19 are provided, the profiling being uniformly aligned about the perimeter of the end facing the drill bit 1. How to clear occlusion. The method according to any one of claims 1 to 3, A simple pointwise coupling at several sites in the region of the profilings 7, 9, 19 between the drill rod assembly 2 or adapter 3 and the drill bit 1 is provided. To unblock the drill bit. Apparatus for unblocking the drill bit 1 during drilling, in particular impact drilling or rotary impact drilling, in soil or rock material, the trill bit 1 being mounted to the drill rod assembly 2 and In an apparatus for releasing a blockage of a drill bit which is actuated by such a drill rod assembly 2 to be rotatable and optionally impacted to form a borehole, One or more helical or vortex connections 7 are provided between the drill bit 1 and the end of the drill rod assembly 2 facing the drill bit 1, which connection blockages the drill bit 1. When retracting the drill rod assembly 2 opposite to the drilling direction at the time, it acts on the trill bit 1 in addition to the linear motion opposite to the drilling direction, independent of the rotational drive for carrying out the drilling process. On the contrary, the drill bit blockage canceling device is characterized by performing a rotational motion. The method of claim 5, wherein One or more helical or spiral connections provided on the adapter 3 arranged between the drill bit 1 and the drill rod assembly 2, the recess or riser 7 or flat portion 19, and the drill Apparatus for uncensoring a drill bit, characterized in that it consists of complementary profiling (9) provided on the bit (1). The method according to claim 5 or 6, A plurality of helical or vortex profilings 7, 9, 19 are provided between each of the drill rod assemblies 2 or adapters 3 and the drill bit 1, the profilings being equally spaced each The block unblocking device of the drill bit, characterized in that aligned. The method according to any one of claims 5 to 7, The obstruction release device of a drill bit, characterized in that said at least one helical or vortex connection or profiling (7, 19) has a large inclination or pitch with respect to the longitudinal axis of said drill rod assembly. The method according to any one of claims 5 to 8, Many substantially point-shaped to cooperate with the helical or vortex recess (es) or recess (es) 7 on the end 6 of the adapter 3 facing the drill bit 1. Or a hemispherical raised portion (9) is provided in the pocket hole (11) of the drill bit (1). The method according to any one of claims 5 to 8, A plurality of adjacent helical flats 19 are provided around the outer periphery of the adapter 3 or the drill rod assembly 2, respectively, and complementary flats are provided in the pocket hole 11 of the drill bit 1. Wherein the flats have a polygonal, eg hexagonal cross-sectional appearance. The method according to any one of claims 5 to 10, Supplying cooling or flushing fluid to the outlet channels or holes 14, 16 of the adapter 3 and / or drill bit 1, inside the drill rod assembly 2 and / or the adapter 3. Passage channels 12, 13 are provided, the passage channels being connected to the peripheral surface of the adapter 3 and / or to the working surface 15 of the drill bit 1. Device. The method according to any one of claims 5 to 11, In order to remove the excavated material through the annular space between the inner wall of the resulting borehole and the outer circumference of the drill rod assembly 2, a recess or recess 18 and / or a passage opening 17 is used to drill the drill. Apparatus for uncensoring a drill bit, characterized in that it is provided in a known manner around the outside of the bit (1).

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