TWI632287B - Drilling device, method for making the same and method of providing a drill hole having a support pipe for use in a pipe umbrella - Google Patents

Abstract

The invention discloses a drilling device suitable for generating a support pipe lining drilling hole for a pipe shed technology, wherein the device comprises: a body (4); a pilot drill bit (2) for drilling a pilot hole (35a); one or more drilling elements (3) that are drilled to apply a rock mass (FG, 27) having a radial component (FGR) and an axial component (FGA) Radially expanding the pilot hole, wherein the one or more drilling elements are mounted on the body such that the one or more drilling elements can extend or retract from the body, and wherein the one or more drilling elements Configuring such that the radial component (FGR) of the rock loosening power prevents the one or more drilling elements from retracting during drilling; wherein the device is consistently operated independently of the rock conditions and ensures that the resulting section is always the same The pupil 35.

Description

Drilling device and method of manufacturing same, and method of providing a bore having a support tube for use in a tube shed

The present invention relates to a method for producing a drilling device mainly used for pipe shed technology, a drilling device for pipe lining drilling for pipe shed (upper plate) technology, and a support for a pipe shed The method of the market.

The so-called pipe shed technology is especially used in tunnel construction on unstable ground or rock to ensure safety and speed up the process and generally allows continuous construction of pilot pits or tunnels in such ground. In addition, the pipe shed technology is used to provide a tunnel section that, when passing through the fault zone, allows the tunnel section to remain open for a sufficient length to be inserted into the final tunnel lining. Even if the tunnel produced has only a very small coverage, it is usually only possible to operate with pipe shed technology. Here, the borehole is made in the exposed rock zone at small intervals and is stabilized by an incoming support tube so that concrete or another solidified component can be brought in around the respective borehole and thus in the pipe shed In a load carrying zone, the pipe shed can then be reinforced beyond conventional tunnel linings such that a suitably stable cross section is available.

Various drilling devices for producing a pipe shed composed of a large number of boreholes are known. However, there is basically a problem in that the drill must have a diameter exceeding one of the outer diameters since the support tube must be inserted. This is achieved by a system with a lost annular drill bit, wherein an annular drill bit is dispensed to the support tube and remains in the borehole after the borehole has been completed, while the core drill bit or the pilot drill bit is The drill string is again removed from the borehole through the support tube and can be reused. It is also known to have a system of a lossy solid drill bit in which the entire drill bit is held in the borehole while the actual rod is recovered through the support tube by properly disassembling the pilot bit after completion of the drilling. Finally, there is a so-called eccentric drilling system in which an eccentric reamer bit is assigned to a pilot bit which allows an enlarged bore diameter depending on the direction of rotation or withdraws the entire passage through the support tube after the bore has been completed A drilling apparatus wherein the eccentric members are rotated in opposite directions into a retracted position. A disadvantage of recent systems is that a mounting bushing must be provided to the eccentric reaming bit to weaken the actual bit and the method or system does not allow the carrying tube to be carried. The support tube must be driven separately depending on the condition of the rock, which causes a lot of problems.

A disadvantage of the recent system is that it has only one pivoting element (so-called eccentric broach) and the entire drilling tool consisting of the pilot bit, the eccentric broach and the mounting bushing is heavily configured and may also have to be . Therefore, the system drills in an unbalanced, non-circular manner. Although the performance of the system is not impaired during vertical drilling, performance is severely affected when drilling horizontally or almost horizontally (such as when drilling a pipe shed). For this reason, it is not possible to establish a system known from, for example, EP 0 511 298 A1. A similar system with only one drilling device (with several eccentrics) is known from EP 0 563 561 A1. DE 22 38 598 4-24 A1 describes a drilling device and a corresponding method in which a radially expandable bore drill head is used behind a drill bit or a pilot bit. The disadvantage of this type of boring drill head is that it can only be used in soft floors, regardless of the fact that the support tube is not automatically pulled forward. In contrast, DE 10 2005 146 495 A1 teaches a drilling device in which the drilling element associated with the pilot bit is configured to be foldable such that when the drilling element is introduced into the body by means of an impact adapter When it is in the support tube, it moves in the direction of the drill shaft and thus can move in and recover the entire drilling device after the drilling is completed. When the additional drilling element slides out of the support tube, it is pivoted axially against the drill by a spring. The path of the drilling elements is limited because they are carried on the inside of the tubular shaft member of the pilot bit and their adapted contact faces are at their front and rear ends. Due to this configuration, the maximum diameter of one of the drilling devices is produced at the effective tip of the outermost planing element on the pivotable drilling element, also indicating the diameter of the bore to be produced during the drilling process. In the described and disclosed solution, the imaginary line between the effective tips of the outermost planing elements on the pivotable drilling elements and the support lines of the drilling elements form a maximum angle of 30°. Therefore, when the configuration of the ground to be passed is different, there is no guarantee that the maximum possible drilling diameter will always be produced. However, only when the diameter is constant, it is ensured that the support tube can also always be introduced backwards to create the desired bore. Drain holes and the like are produced in a similar manner.

Accordingly, a potential object of the present invention is to further develop a drilling apparatus having a pilot bit and a pivotable drilling element such that a constant bore diameter is always ensured even if the formation is unsuitable.

This object is achieved by the method according to the invention such that the radial portion (FGR) of the resulting rock loosening power (FG) is adjusted to prevent the drilling element from pivoting back in the direction of the drill shaft during the drilling operation.

When applying this method, it is ensured that the diameter of the hole can be maintained at a constant maximum size regardless of the rock conditions. In this way, when such a hole is drilled, it is always ensured that the support tube can be introduced or pushed out there without clogging or blocking. When manufacturing a drilling apparatus of this type, the drilling element designed to pivot is thus configured such that partial reverse pivoting under the primary force is completely prevented. Therefore, the force acting on the pivotable drilling element always has the effect of maintaining it in an "operating position". The device according to the invention also has the advantage of being consistently operated independently of the rock conditions and ensuring that pupils of substantially the same or similar cross-section are produced.

According to a practical embodiment, it is assumed that the radial portion (FGR) of the rock mass (FG) applied by the drilling element is configured to be smaller than the axial portion (FGA). This can be achieved by appropriately shaping and/or configuring the drilling elements, as will be explained below. In this case, the problems of the prior art are solved because the drilling elements remain always active during drilling (due to the corresponding distribution of rock loose power).

In addition, it should be noted that, according to the current optimum state, the maximum corresponding effective angle is 30° to 32°. According to another embodiment, the imaginary connection/action line and the drill axis between the pivot point of the drilling element and the effective tip of the outermost planing element of the drilling element are now produced or configured by the drilling element The effective angle α between them is adjusted to be equal to or greater than 35° to ensure the required adjustment of the axial loose power. Thus, the individual drilling elements are shaped and configured such that the resulting effective angle has a size that can be drilled when drilling one of the constant diameters.

In the case of a device, the object is to provide a one-piece or multi-piece drilling element that is configured to pivot about a base point axis about a distance from the drill shaft and that lies in the action line and the drill shaft of the drilling element The effective angle between the two is greater than the angle of the resulting rock loose power relative to the drill shaft. If this angle ratio is ensured, one of the drilling devices of this type can be used for reliable operation, because when the rock conditions are not suitable, it is ensured that the drilling element or several drilling elements cannot be removed from the outermost position, even if the rock is composed. Changes in material, hardness, etc.

According to another useful embodiment, it is assumed that the effective angle between the imaginary line between the base point axis and the effective tip of the outermost planing element and the drill shaft is equal to or greater than 35°. This angle has proven to be sufficient for potential purposes, so ensure that the diameter of a borehole is always the same when drilling with this device. If the angle is greater than 35° (eg, up to 55°), this property is further ensured, which may be potentially useful, as the effective tip of the outermost planing element during the drilling operation may, for example, naturally change or its position may Change naturally. This level of effective angle will offset this and thus ensure that the borehole always has a constant diameter, even during extended drilling operations.

Another useful embodiment assumes that the pilot bit as the basic bit is attached to one of the tubular bases associated with the base bit by a threaded connection to effect displacement of the drilling element in the direction of the drill axis or in parallel thereto. This allows the required drilling elements or even only a single drilling element to be inserted into the basic body from the front side. This eliminates the need for the drilling element to be inserted laterally into the body of the basic pilot bit so that the drilling element can advantageously have another support than has been supported to date. Furthermore, the entire drilling element can advantageously be shortened, so that an effective angle in the range of about 35° and above can be easily obtained by this design.

As already mentioned, due to the configuration of the drilling device, the drilling element has more support on the surrounding substrate. The invention additionally assumes that the drilling element has side walls to achieve lateral support in the window-shaped aperture of the substrate. Thus, the individual drilling elements can be supported over the entire side wall without the need for expensive special designs.

According to an advantageous embodiment, it is assumed that the drilling element can pivot about an imaginary base point axis on the impact adapter. As already mentioned, the drilling element or several drilling elements are introduced from the front by a basic drill bit or a pilot drill bit and are suitably positioned by the window, whereby they are not pivotally arranged around a solid axis, but instead Imagine around the base point axis where the impact adapter has the desired recess. Thus, the mode of facilitating assembly and ensuring operation is also achieved because the drilling element does not rotate about an axis, but can actually tilt about the base point axis. The impact adapter provides the required bearing possibilities.

This type of drilling device has one of the rotary-percussive actions provided for the impact adapter. For an impact adapter that can effectively transmit such impacts, and on the other hand, for a drilling element that absorbs such impacts, it is assumed that one of the impact shoulders extending radially relative to the drill shaft is formed in the impact adapter And a corresponding bearing surface on the tubular base body and on the associated rear side of the drilling element itself. This configuration provides a sufficiently large surface that does not include deformation during extended operation and, as already mentioned, ensures reliable transmission of impact energy.

The drilling element must be pivoted from its working position against a spring force, whereby it is assumed according to the invention that the spring system supporting the drilling element is configured as a coil spring and by being placed on the rear of the pilot bit Supported by guiding aids. The coil spring can be configured to extend along a slight curve to safely deliver the desired force whereby it is still supported by the guide aid. Therefore, a sufficiently strong spring can be obtained to smoothly perform the pivoting action of the drilling element while preventing the spring from being bent by the guiding aid although a sufficient force is always applied.

The pivotable drilling elements used must partially deliver a substantial planing action. This is ensured by having the drilling element assembled with three planing elements, whereby both are positioned on the outer edge of the drilling element. Here, the main planing work must be done so that the required reliability here is given by the dual configuration of the planing elements at the outer edge. The planing element placed at the inner edge may be slightly more prominent than the planing element positioned at the outer edge, such that the planing element performs a certain amount of initial work and thus supports the planing element placed at the outer edge and prevents overloading.

As mentioned above, the drilling element can be pivoted or actually tilted about the imaginary base point axis. To facilitate this process, the present invention assumes that the impact shoulder on the impact adapter has a guide ramp formed to facilitate one of the inward pivoting of the drilling element. Advantageously, the guiding ramp supplies and limits the tilting process such that it also promotes reverse pivoting or reverse tilting due to spring force.

In particular, the invention features a drilling apparatus that ensures that a borehole can always have a constant diameter and a sufficiently large diameter regardless of rock conditions. In particular, the present invention provides a pivotable or tiltable drilling element that is positioned in a tubular body and configured such that when it is removed from the support tube, it is initially attached to it by a spring The position is pivoted. However, in this position, the drilling element is no longer perceived to be held by the spring, but due to the particular design, it is ensured that the radial portion of the resulting rock loose power does not include the drilling element being pivoted in the reverse direction of its own size. The radial portion is smaller than the axial portion of the rock loose power, which is achieved by an effective angle equal to or greater than 35° (and thus significantly greater than the effective angle in the current best state). Thus, the individual drilling elements (preferably each drill bit comprising two drilling elements) are always held in the outermost position and do not require any springs or the like. During operation of one of the drilling devices of this type (even after the extended operating period) it is always guaranteed that one of the holes is constant and large enough.

Further details and advantages of the subject matter of the invention are set forth in the following description of the drawings, in which a preferred embodiment is described in detail.

1 shows a tunnel or pilot 55 driven into a rock 14 in which a support structure 56 has been mounted. Indicate the tunnel pavement or ground at 57, where the lower area has been backfilled. The pilot 55 or the tunnel itself is protected by a shed 60 because the surrounding rock 14 necessitates the formation of this shed 60. The shed 60 is comprised of a steel tube 58 that is driven into the rock 14 and a potting material (preferably concrete 59) that has been forced into the rock 14 on the steel tube 58. The steel tube 58 has been advanced into the corresponding bore or bore 35, which will be explained in further detail by means of another drawing.

Figure 2 shows a drilling apparatus 1 in which the pilot bit 2 projecting forwardly has produced a pilot hole 35a (which is part of the hole 35). This pilot bit 2 is supported by a drilling element 3 which is mounted and held by a tubular base 4 attached to the pilot bit 2. The base body 4 and the pilot bit 2 are joined together by a threaded joint 39 or the like. The apertures 40 are arranged in the base body 4 through which the drilling elements 3 project outwardly and are held in this position by the springs 8.

Like the pilot bit 2, the drilling element 3 is also equipped with a planing element 15. As clearly shown in Figure 4, a number of such hard metal front pins 16 and edge pins 17 (serving as planing elements 15) are attached to the pilot bit 2, and the hard metal front pin 18 and the hard metal edge pin 19 are attached. To the drilling element 3. These are conventional planing elements 15 in which the arrangement of the drilling elements or of several drilling elements 3 is unique in that the two such planing elements 15, 18, 19 are attached to the outer edge here. 52' and one attached to the inner edge 51.

The operational position reproduced in Figures 1 and 2 clearly shows that a drilled hole can have a diameter larger than one of the outer diameters of the support tube 12 by means of the drilling element 3. This support tube 12 is fitted with a shoe 11 in the direction of the deepest portion of the bore. The tube shoe 11 has an impact shoulder 7 with which the entire support tube 12 is carried during the rotary percussion drilling. As already mentioned, the bore diameter is large enough to ensure that the support tube 12 can be carried in any case. The impact shoulder 7 on the tube shoe 11 corresponds to the impact shoulder on the impact adapter such that a continuous overall operation can be achieved by extending the drill rod 22 when working with the drilling apparatus. The drill pipe 30 or the extension drill pipe 22 is operatively coupled to a drilled member (not shown). A drilled member can be any device that is capable of providing a suitable rotational and/or impact force to the drilling device.

The drilling element 3 is in the working position of Figures 2 and 3, wherein the required force is reliably transmitted into the rock, since a sufficiently large impact shoulder 6 is provided to the impact adapter 5 and the drilling element 3 Between the later sections. There are two impact shoulders 42, 43 one associated with the impact impact adapter 5 and the other associated with the tubular base 4. Due to the large contact surface 45 of the drilling element 3, it is ensured that the force of interest is transmitted safely into the rock 14 via the drilling element 3. Furthermore, there are advantageously additional impact shoulders 7, 62, 63 between the impact adapter and the base 4, between the base 4 and the pilot bit 2, and between the impact adapter 5 and the shoe 11.

In addition, Figure 2 clearly shows that the hard metal pin 19 (as the planing element 15) is positioned slightly forward of the hard metal front pin 18 to facilitate the operation of the two hard metal front pins 18.

As already mentioned, when the extension drill pipe 22 is introduced into the support tube 12, the drilling element 3 can be pivoted in the tubular body 4 via a window-shaped aperture 40 (firstly by means of a spring 8 followed by a spring force). As can be seen in Figure 3, the spring system is configured to have one of the coil springs 48 having a curvature (this can be seen in Figure 2). To ensure uniform and reliable movement of the coil spring 48, a guide aid 50 is provided in the rear portion 49 and the spacer 9 to effectively prevent deflection of the coil spring 48. The shape of this guiding aid 50 can be seen in both Figures 3 and 2, wherein this particular configuration of the spacer of Figure 2 is indicated by reference numeral 10.

Figure 3 further shows one of the guiding ramps 53 that produces or promotes the tilting of the drilling element 3, as seen, for example, in Figure 5. To do so, the drilling element is tilted about the so-called base point 46 or, more correctly, around the imaginary base point axis 26. Figures 5, 6 and 7 show the drilling apparatus in the retracted position. Obviously, when the spring 8 or the coil spring 48 is compressed along its extreme position, the drilling element 3 is in an inclined position. This oblique position of the drilling element can be seen particularly clearly in FIG. 5, wherein in the semi-longitudinal section, the drilling element 3 also protrudes significantly from one of the apertures 40 in the tubular base body 4 and thus by the side wall 41 (this figure Not visible in the support). As mentioned, Figure 6 shows a perspective view of the drilling apparatus 1 in a retracted position in which the particular configuration of the spring 8 as the coil spring 48 is shown. As seen here and in other cross sections, the shoe 11 is attached to the support tube by a thread 13. Figure 7 shows a front view of the drilling apparatus 1 in the retracted position in which the shaving element 15 of the drilling element 3 is no longer visible.

Figure 8 shows the position of the pilot bit 2 and the drilling element 3 indicated in Figure 2, which also shows the force during the rock loosening process. The two-part basic drill bit with its pilot bit 2 and the tubular base body 4 have a threaded connection 39. Both (including the impact adapter 5) are attached to the extension drill pipe 22 or the drill pipe 36. This connection option allows the drilling element 3 to be very short, which in turn enables an effective angle of more than 35° between the line of action 24 and the drill shaft 23, the line of action 24 being from the base point shaft 26 and the drilling element 3 An imaginary connecting line 37 between the effective tips 38 of the outermost planing elements 15, 18 is formed. In other words, ensuring a stable position of the drilling element 3 in the drilling position is such that the line of action 24 of the drilling element 3 and the support lines of the drilling elements 3 (ie the peripheral planing of the pivotable drilling element 3) The angle 25 between the imaginary line between the effective tips 38 of the cutting elements 15, 18 and the support lines of the drilling elements 3 and the drill shaft 23 is greater than the resulting planing applied to the peripheral planing elements 15, 18 The force or the resulting rock loose power 27 is at an angle 30 to the drill shaft 23. The axial and radial rock loose power is indicated at 28 and 29. 31 is a rock loose power FEW acting on the drilling element 3 with respect to the drill shaft 23, and 32 is a radial rock loose power FER effective on the drilling element 3.

At the end of the drilling process, the prior art drilling system must release the lossy ring bit or the loss of the solid bit from the drill rod 36 or must pivot the element back, ie, pivot out (in the case of an eccentric drill) . This is almost always done by rotating the drill pipe 36 in a direction opposite to the direction of rotation when drilling. The remaining drill pipe 36 can only be withdrawn when the release process has been completed. The release process is often very difficult and usually takes a lot of time. In addition, there is a risk that the connection between the lossy drill bit and the pilot drill bit cannot be loosened, but the other of the many connections between the drill pipe 36 and the extension drill pipe 22 can be loosened. This means that it takes more time and the eccentric system may be lost if the eccentric drill cannot pivot inward.

The drilling system of the present invention does not encounter such problems because there is no need to reverse rotation when the drill rod 36 is withdrawn. Each of the drilling elements 3 is folded inwardly by itself when retracted, and its rear side has a bevel 80 supported on the leading edge 81 of the inner tube shoe 11. The withdrawal of the drill rod 36 forces the drilling element 3 to resist the spring force inwardly and thus forces the drilling elements to fold inward. When the drill rod 36 is withdrawn, it does not matter whether the drill rod 36 is rotating or not.

annex

The invention will now be further defined by the following statements.

According to the present invention, there is provided a method of producing a drilling apparatus for a pipe shed technology which utilizes a pipe shed technique to produce a pipe lining bore in a rock from a drilling apparatus while introducing a support pipe, whereby the drilling apparatus is Consisting of one or more drilling elements representing one of the leading end of the drill pipe in the borehole and the borehole for generating the support tube, the necessary rock mass drive for the enlarged bore is passed The planing element is reliably transferred to the rock to be drilled, the method being characterized in that the radial portion (FGR) of the resulting rock loosening power (FG) is adjusted to prevent the drilling element from reversing in the direction of the drill axis during the drilling operation Pivot.

In some embodiments of the method, the radial portion (FGR) is adjusted to be less than the axial portion (FGA) of the rock loosening power (FG).

In some embodiments of the method, the radial rock looseness (FER) is affected by the generation or configuration of the drilling element between the pivot point of the drilling element and the effective tip of the outermost planing element. The effective angle α between the imaginary connecting line/action line and the drill shaft is adjusted to be equal to or greater than 35°.

According to the present invention, there is provided a drilling apparatus for producing a pipe lining bore for a pipe shed technology having a pilot bit (2) and associated drilling elements for producing an enlarged hole accompanying the support pipe ( 3) whereby the drilling element (3) connected to the drill rod (36) by means of an impact adapter (5) is equipped with a planing element (15) and during introduction and withdrawal of the support tube (12) Is configured to be pivotable with or against the force of a spring (8) characterized in that the one-piece or multi-piece drilling element (3) is configured to be positioned around the drill The shaft (23) pivots with a distance from the base point axis (26) and the drilling element (3), its planing element (15) and the base point shaft (26) are configured and configured such that the drilling element (3) The effective angle (25) between the line of action (24) and the drill shaft (23) is greater than the angle (30) between the resulting rock loose power (27) and the drill shaft (23).

In some embodiments of the drilling apparatus, the imaginary connection line (37) between the base point shaft (26) and the effective tip (38) of the outermost planing element (18) is effective between the drill shaft (23) The angle (25) is equal to or greater than 35°.

In some embodiments of the drilling apparatus, the pilot bit (2) acting as a basic drill bit is attached to a tubular base body (4) associated with the base bit by a threaded connection (39) to effect the drilling element (3) Movement in the direction of the drill shaft (23) or in the parallel direction thereof.

In some embodiments of the drilling apparatus, the drilling element (3) has side walls to effect one of the laterally supported (41) of the window-shaped apertures (40) of the substrate (4).

In some embodiments of the drilling apparatus, the drilling element (3) is pivotable on the impact adapter about an imaginary base point axis (26).

In some embodiments of the drilling apparatus, one of the radially extending shoulders (42, 43) relative to the drill shaft (23) is formed on the impact adapter (5) and the tubular base (4), and The associated rear side (44) of the drilling element (3) has a pair of mating contact faces (45).

In some embodiments of the drilling apparatus, the spring (8) supporting the drilling element (3) is configured as a coil spring (48) and by being positioned on the rear portion (49) of the pilot bit (2) Guided by the guide aid (50).

In some embodiments of the drilling apparatus, the drilling element (3) is equipped with three shaving elements (15, 18, 19) whereby both are positioned on the outer edge (52) of the drilling element (3) .

In some embodiments of the drilling apparatus, the impact shoulder (42) on the impact adapter (5) has a guide bevel formed thereon to facilitate inward pivoting of the drilling element (3) ( 53).

1. . . Drilling device

2. . . Pilot drill

3. . . Drilling element

4. . . Ontology

5. . . Impact adapter

6. . . Impact shoulder

7. . . Impact shoulder

8. . . spring

9. . . Spacer

10. . . Specific configuration in the spacer

11. . . Tube shoes

12. . . Support tube

13. . . Thread

14. . . rock

15. . . Planing component

16. . . Hard metal front

17. . . Hard metal edge pin

18. . . Hard metal front pin/planing element

19. . . Hard metal edge pin/planing element

twenty two. . . Extend the drill pipe

twenty three. . . Drill shaft

twenty four. . . Action line / drilling element axis

25. . . Effective angle / α

26. . . Base point axis

27. . . Rock Song Power / FG

28. . . Axial component / FGA

29. . . Radial component / FGR

30. . . Angle / β

31. . . Rock loose power / FEW

32. . . Radial rock loose power / FER

35. . . Pupil

35a. . . Pilot hole

36. . . Drill pipe

37. . . Imaginary connection line

38. . . Effective tip

39. . . Threaded joint / threaded joint

40. . . Porosity

41. . . Lateral support / side wall

42. . . Impact shoulder

43. . . Impact shoulder

44. . . Back side

45. . . Contact surfaces

46. . . base point

48. . . Coil spring

49. . . rear

50. . . Guide aid

51. . . Inner edge

52. . . Outer edge

53. . . Guided slope

55. . . Tunnel/guide pit

56. . . supporting structure

57. . . Tunnel pavement/ground

58. . . Steel Pipe

59. . . Concrete

60. . . Pipe shed

62. . . Impact shoulder

63. . . Impact shoulder

80. . . Bevel

81. . . Inner leading edge

Figure 1 shows a section of a pit or a tunnel with a pipe shed;

Figure 2 shows a side view of the drilling device in one of the drilling positions;

Figure 3 shows a quarter sectional view of the drilling device in one of the drilling positions;

Figure 4 shows a front view of the drilling device in one of the drilling positions;

Figure 5 shows a side view of the drilling device in one of the retracted positions;

Figure 6 shows a quarter cross-sectional perspective view of one of the drilling devices in the retracted position;

Figure 7 shows a front view of the drilling device in one of the retracted positions; and

Figure 8 shows the force at one of the drilling locations and depicts the forces during the rock loosening process.

Claims (23)

A drilling apparatus for forming a bore (35) by a rotary impact to mount a support tube of a pipe shed, the drilling apparatus comprising: a body (4) having one or more impact shoulders (6, 42, 43); a rotatable pilot bit (2) for drilling a pilot hole (35a) by a rotary impact, the pilot bit being attached to the body; and one or more holes Element (3), each drilling element having a plurality of planing elements (15, 18, 19), each of which is pivotally mounted relative to the body such that each drilling element is indented The respective pivot point (26) between the return position and an operating position is pivotally movable, wherein in the retracted position, the drilling device is retractable through the support tube, wherein in the operating position The drilling elements are positioned to radially expand the pilot hole by drilling a hole through which each of the drilling elements applies a rock loose power (FG, 27) to the pilot hole Rock (14), wherein one of the rear side (44) of each of the drilling elements has a contact surface (45), when the respective drilling element is in the operating position, The contact surface abuts one of the impact shoulders, and the rock loose power acting on the planing elements of each of the drilling elements is transmitted through the adjacent rear contact surface and the impact The shoulders enable the respective drilling elements to be stably supported and prevented from retracting from the operating position by the body in an operative position, wherein the pilot bit defines a pilot drill shaft (23), wherein the plurality of drilling elements The planing element comprises at least one outermost planing element (18), Wherein each of the drilling elements has a drilling element shaft (24) extending through the at least one outermost planing element and the base point axis of the respective drilling element, and a first one of the first angles (25) is defined Between the respective drilling element axis and the pilot drilling axis, a second angle (30) is an angle between the pilot drilling axis and the rock loose power, and the first angle is greater than the second angle. The drilling apparatus of claim 1, wherein the first angle is equal to or greater than 35°. A drilling apparatus according to claim 1 or 2, wherein for each of the drilling elements, the base point shaft is positioned at a radially inner edge of the rear contact surface. A drilling apparatus according to claim 1 or 2, wherein the body has one or more apertures (40), and each of the drilling elements is pivotally mounted to the body for extending through or retracting Enter each of these pores. A drilling apparatus according to claim 1 or 2, wherein each of the drilling elements has a side wall (41) to effect lateral support in the one or more apertures. A drilling apparatus according to claim 1 or 2, wherein the drilling elements are biased to be in the operational position. The drilling apparatus of claim 6, wherein the one or more drilling elements are biased by an elastic member. A drilling apparatus according to claim 7, wherein the elastic member is a spring (8). A drilling apparatus according to claim 8, wherein the spring is a coil spring. A drilling apparatus according to claim 7, wherein the elastic member is supported by a guide aid (50). The drilling apparatus of claim 10, wherein the guiding aid is in the first Guide the drill bit (2) on the rear (49). A drilling apparatus according to claim 1 or 2, wherein the body comprises a tubular base body (4). A drilling apparatus according to claim 12, wherein the tubular base comprises one of a plurality of impact shoulders (42). A drilling apparatus according to claim 1 or 2, wherein the body comprises an impact adapter (5). A drilling apparatus according to claim 14, wherein the impact adapter comprises one of a plurality of impact shoulders (43). A drilling apparatus according to claim 14, wherein each of the drilling elements is pivotable on the impact adapter about the respective base point axis. The drilling apparatus of claim 14, wherein the impact adapter includes a guiding ramp (53) to assist in the extension and/or retraction of the drilling elements. A drilling apparatus according to claim 1 or 2, wherein the impact adapter includes an impact shoulder configured to carry a support of a tube (11) during rotation of the impact drill using the drilling apparatus Tube (12). A drilling apparatus according to claim 1 or 2, further comprising a drill rod (36) for connection to a drilling member. A drilling apparatus according to claim 19, wherein the body is coupled to the drill pipe. A drilling apparatus according to claim 19, wherein the drill rod has one or more elongated drill rods (22). The drilling apparatus of claim 1 or 2, wherein each of the drilling elements is configured such that the radial component (FGR) of the rock loose power is less than the rock The axial component (FGA) of the loose power. A method for providing a bore (35) having a support tube for use in a tube shed by a rotary shock, the method comprising: (a) providing a support tube fitted with a tube shoe (11) and as requested A drilling apparatus as defined in any one of clauses 1 to 23, wherein the drilling apparatus comprises a drill rod (36) for connecting the drilling apparatus to a drilling member, and wherein the drilling apparatus is constructed Forming the support tube; (b) operating the drilling member to cause the drilling device to drill the borehole by rotating impact and carrying the support tube into the borehole; and (c) passing the support tube The drill rod is withdrawn, whereby the drilling device is removed along with the drill rod, and the support tube and the tube shoe are left in the bore.