Inclined surface trepanning tool and device for trepanning inclined surface of tunnel outside TBM (Tunnel Boring Machine) shield

Abstract

The utility model relates to the technical field of drilling, in particular to an inclined plane trepanning tool and a device for trepanning an inclined plane of a tunnel outside a TBM (Tunnel Boring Machine) shield. The transition connecting piece is arranged in the sleeve assembly in a penetrating mode, an annular groove in clearance fit with the annular protrusion is formed in the outer wall of the transition connecting piece in the circumferential direction, and the two ends of the transition connecting piece are detachably connected with a drill bit and a drill rod respectively. The transition connecting piece and the sleeve assembly are axially fixed, relative rotation is not hindered in the circumferential direction, the sleeve assembly can advance along with a drill bit and a drill rod, the radial supporting effect on the drilling assembly is always achieved, and drilling deflection caused by drill bit deflection is prevented. The sleeve assembly does not rotate along with the transition connecting piece, the drill bit and the drill rod, so that supporting is firmer, meanwhile, the outer portion of the sleeve assembly is not abraded, and parts outside the sleeve assembly are not abraded.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling, in particular to an inclined surface hole opening tool and a device for opening an inclined surface hole in a TBM shield outer tunnel. Background Art

[0002] During the construction of full-face hard rock tunnel boring machine (TBM) tunnel engineering, it is necessary to use an advance drilling rig to conduct advance drilling or advance pipe support construction through the advance grouting conduit on the TBM shield. Since the deflection angle between the grouting conduit and the TBM excavation direction is small, generally between 6°-10°, and there is a 40~50mm gap between the shield and the tunnel wall, when the advance drill bit extends from the TBM's grouting conduit, it can only drill holes on the tunnel wall at a small angle, and the drilling is seriously deflected, which can easily cause the drill to get stuck. In addition, when facing rocks with medium hardness or above, it is often impossible to drill holes smoothly, which seriously affects the efficiency of advance drilling and tunnel excavation construction.

[0003] There are generally two types of construction methods:

[0004] 1. Relying on the rigidity of the drill pipe and the support of the TBM grouting pipe to directly drill holes and slowly grind the tunnel slope. This method has serious hole deviation and low efficiency.

[0005] 2. Install a casing with an inner diameter slightly larger than the drill bit diameter in the grouting conduit of the TBM to guide and support the drill bit when drilling. During the drilling process, the drill bit cuts the rock wall while cutting the casing, which will cause serious wear on the drill bit or drill rod and casing. In addition, since the drill bit diameter is larger than the drill rod diameter, when the drill bit moves forward and leaves the guide casing, it loses direct guide support, causing the drill bit to deviate in direction, and ultimately it is still difficult to avoid the problem of hole deviation. Utility Model Content

[0006] The utility model aims to solve the existing problems of easy deviation and casing wear when performing advanced inclined hole opening on the tunnel wall, and to provide an inclined hole opening tool and a device for inclined hole opening in a TBM shield outer tunnel.

[0007] The technical solution provided by the utility model is as follows: a bevel hole drilling tool, used for drilling with a drill bit and a drill rod, comprising:

[0008] A sleeve assembly, wherein an annular protrusion is circumferentially arranged on the inner wall of the sleeve assembly;

[0009] A transition connector is inserted into the casing assembly, and an annular groove is circumferentially arranged on the outer wall of the transition connector to match the annular protrusion gap. One end of the transition connector is provided with a first interface for detachably connecting a drill bit, and the other end is provided with a second interface for detachably connecting a drill rod.

[0010] During use, connect both ends of the transition connector to the drill bit and the drill pipe respectively. The transition connector and the casing assembly are axially fixed through the clearance fit between the annular groove and the annular protrusion, and there is no circumferential hindrance to relative rotation. Therefore, when drilling, the casing assembly can advance together with the drill bit and the drill pipe, and the relative position between the drill bit and the casing assembly remains fixed, always playing a radial supporting role for the drilling assembly to prevent the opening from being skewed due to the skew of the drill bit; the casing assembly does not rotate together with the transition connector, the drill bit and the drill pipe, making the support more firm, and at the same time, it will not cause wear on the outside of the casing assembly, nor will it wear the components outside the casing assembly; in addition, the transition connector bears most of the wear and can be replaced as a wearing part, avoiding wear on the drill pipe and reducing costs.

[0011] Preferably, the drill bit is provided with a drill bit interface identical to the second interface, and the drill pipe is provided with a drill pipe interface identical to the first interface, that is, the originally connected drill bit and drill pipe can be directly connected to the transition connector without special design for the drill bit and the drill pipe, with a wider adaptability.

[0012] Preferably, the casing assembly includes a downhole motor sleeve and a casing body detachably connected to the downhole motor sleeve. The downhole motor sleeve is located on the side close to the drill bit and the annular protrusion is located on the inner circumference of the downhole motor sleeve.

[0013] Setting the annular protrusion on the downhole motor sleeve, the downhole motor sleeve is prone to wear, so it can be replaced as a replacement part to reduce the use cost.

[0014] Preferably, the cutting edge of the drill bit protrudes outside the downhole motor sleeve, and the inner surface of the downhole motor sleeve has a clearance fit with the outer surface of the tail of the drill bit. The cutting edge of the drill bit is located outside the casing assembly, avoiding grinding of the casing assembly by the drill bit; the downhole motor sleeve supports the tail of the drill bit to improve the stability of the drill bit.

[0015] Preferably, the tail of the drill bit axially abuts against the side of the annular protrusion facing the cutting edge of the drill bit, that is, the tail of the drill bit is used to form a part of the annular groove, reducing the processing difficulty when making the annular groove on the transition connector.

[0016] Preferably, the drill bit interface and the second interface are frustum-shaped grooves, and the drill pipe interface and the first interface are frustum-shaped protrusions. Using a frustum for connection is more convenient for installation and the torque transmission is more uniform.

[0017] Preferably, a plurality of guiding ribs are circumferentially distributed on the outer circumference of the drill pipe, and each guiding rib extends along the axial direction of the drill pipe. The setting of the guiding ribs not only plays a supporting role for the drill pipe, but also forms a slag discharge space between the casing body and the drill pipe.

[0018] Preferably, the downhole guidance sleeve is provided with a plurality of slag discharge holes distributed circumferentially. The slag discharge holes penetrate through the wall surface of the downhole guidance sleeve, and the slag discharge holes are located on the side of the annular protrusion away from the drill bit. The soil slag around the cutting edge of the drill bit is extruded backward along the outer surfaces of the drill bit and the casing assembly, enters the casing assembly through the slag discharge holes, and is discharged backward from the gap between the casing assembly and the drill pipe.

[0019] A device for opening an inclined hole in a tunnel outside the TBM shield includes a drill bit and a drill pipe. A grouting conduit communicating with the tunnel rock wall is provided on the side of the TBM shield. When using the inclined hole opening tooling for opening the hole, the drill bit is detachably connected to the transition connector, the drill pipe is detachably connected to the transition connector, and the casing assembly is sleeved inside the grouting conduit.

[0020] During use, the casing assembly is installed inside the grouting conduit. Since the contact area between the casing assembly and the grouting conduit is larger than the contact area between the casing assembly and the drilling assembly, the frictional force between the casing assembly and the grouting conduit is greater than the frictional force between the casing assembly and the drilling assembly. Therefore, the casing assembly will not rotate with the drilling assembly, and thus the casing assembly will not cause damage to the grouting conduit.

[0021] Preferably, the outer diameter of the drill bit is smaller than the inner diameter of the grouting conduit, so that it is more convenient to install the drill bit and then insert it into the grouting conduit.

[0022] Compared with the prior art, the present utility model has the following beneficial effects:

[0023] Connect the two ends of the transition connector to the drill bit and the drill pipe respectively. The transition connector and the casing assembly complete axial fixation through the clearance fit of the annular groove and the annular protrusion, and do not hinder relative rotation circumferentially. Therefore, when drilling, the casing assembly can move forward together with the drill bit and the drill pipe, and the relative position between the drill bit and the casing assembly remains fixed, always playing a radial supporting role for the drilling assembly to prevent the opening from being deflected due to the deflection of the drill bit;

[0024] The casing assembly does not rotate together with the transition connector, the drill bit and the drill pipe, making the support more firm. At the same time, it will not cause wear outside the casing assembly, nor will it wear the components outside the casing assembly;

[0025] In addition, the transition connector bears most of the wear and can be replaced as a wear part, avoiding wear on the drill pipe and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. 28 is a schematic external view of Embodiment 1 of the present utility model equipped with a drill bit 3 and a drill pipe 4;

[0027] Figure 2Schematic cross-sectional view of the first embodiment of the present utility model with a drill bit 3 and a drill pipe 4 installed;

[0028] Figure 3 Schematic cross-sectional view of the transition connector 2 and the drill pipe 4 of the first embodiment of the present utility model;

[0029] Figure 4 Schematic cross-sectional view of the drill pipe 4 of the first embodiment of the present utility model;

[0030] Figure 5 Schematic cross-sectional view of the transition connector 2 of the first embodiment of the present utility model;

[0031] Figure 6 Schematic cross-sectional view of the casing assembly 1 of the first embodiment of the present utility model (part of the casing body 13 is cut off);

[0032] Figure 7 Schematic cross-sectional view of the downhole guidance sleeve 12 of the first embodiment of the present utility model;

[0033] Figure 8 General schematic diagram when the second embodiment of the present utility model is in use;

[0034] Figure 9 General cross-sectional schematic diagram when the second embodiment of the present utility model is in use;

[0035] Figure 10 Is Figure 9 Enlarged schematic diagram at position A in

[0036] Explanation of reference numerals: casing assembly 1, annular protrusion 11, downhole guidance sleeve 12, slag discharge hole 121, casing body 13, transition connector 2, first interface 21, second interface 22, annular groove 23, drill bit 3, drill bit interface 31, cutting edge 32, tail 33, drill pipe 4, drill pipe interface 41, guiding rib 42, grouting conduit 5, tunnel rock wall 6, TBM shield 7. Specific implementation manners

[0037] The following further describes the specific implementation manners of the present utility model with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the present utility model and are not used to limit the present utility model.

[0038] Embodiment 1, as Figures 1-7 shown, an inclined surface hole-opening tooling for cooperating with a drill bit 3 and a drill pipe 4 for drilling, comprising:

[0039] A casing assembly 1, with an annular protrusion 11 circumferentially arranged on the inner wall of the casing assembly 1;

[0040] The transition connecting piece 2 is inserted into the casing assembly 1. A circumferential annular groove 23 which is in clearance fit with the annular protrusion 11 is arranged on the outer wall of the transition connecting piece 2. One end of the transition connecting piece 2 is provided with a first interface 21 for detachably connecting the drill bit 3, and the other end is provided with a second interface 22 for detachably connecting the drill pipe 4.

[0041] The above detachable connection method can be threaded connection or keyway fixation, or other fixation methods can also be adopted.

[0042] During use, the two ends of the transition connecting piece 2 are respectively connected to the drill bit 3 and the drill pipe 4. The transition connecting piece 2 and the casing assembly 1 are axially fixed through the clearance fit between the annular groove 23 and the annular protrusion 11, and the relative rotation is not hindered circumferentially. Therefore, when drilling, the casing assembly 1 can advance together with the drill bit 3 and the drill pipe 4, and the relative position between the drill bit 3 and the casing assembly 1 remains fixed, always playing a radial supporting role for the drilling assembly 1, preventing the drill bit 3 from deflecting and causing the opening to deflect, improving the quality of the inclined surface opening and the construction efficiency during construction, and effectively avoiding the accident of rod jamming during the advanced drilling process caused by the opening deflection; the casing assembly 1 does not rotate together with the transition connecting piece 2, the drill bit 3 and the drill pipe 4, making the support more firm, and at the same time, it will not cause wear on the outside of the casing assembly 1, nor will it wear the components outside the casing assembly 1; in addition, the transition connecting piece 2 bears most of the wear and can be replaced as a wearing part, avoiding the wear of the drill pipe and reducing the cost.

[0043] The drill bit 3 is provided with a drill bit interface 31 which is the same as the second interface 22, and the drill pipe 4 is provided with a drill pipe interface 41 which is the same as the first interface 21, that is, the originally connected drill bit 3 and drill pipe 4 can be directly connected to the transition connecting piece 2 without special design for the drill bit 3 and the drill pipe 4, and the adaptability is wider.

[0044] The casing assembly 1 includes a downhole guidance sleeve 12 and a casing body 13 which is detachably connected to the downhole guidance sleeve 12. The downhole guidance sleeve 12 is located on the side close to the drill bit 3 and the annular protrusion 11 is located on the inner circumference of the downhole guidance sleeve 12. In this embodiment, the outer diameter of the downhole guidance sleeve 12 is 2 mm smaller than the diameter of the drill bit 3, and it can enter the rock hole with the drill bit 3 and continuously provide guiding support for the drill bit 3.

[0045] The annular protrusion 11 is arranged on the downhole guidance sleeve 12, and the downhole guidance sleeve 12 is prone to wear, so it can be replaced as a replacement part to reduce the use cost.

[0046] The cutting edge 32 of the drill bit 3 protrudes outside the downhole guidance sleeve 12, and the inner surface of the downhole guidance sleeve 12 is in clearance fit with the outer surface of the tail part 33 of the drill bit 3. The cutting edge 32 of the drill bit 3 is located outside the casing assembly 1, avoiding the grinding of the drill bit on the casing assembly 1; the downhole guidance sleeve 12 supports the tail part 33 of the drill bit 3 to improve the stability of the drill bit.

[0047] The tail 33 of the drill bit 3 abuts axially against the side of the annular protrusion 11 facing the cutting edge 32 of the drill bit 3, that is, the tail 33 of the drill bit 3 is used to form a part of the annular groove 23, so as to reduce the processing difficulty when making the annular groove 23 on the transition connecting member 2.

[0048] The drill bit interface 31 and the second interface 22 are frustum-shaped grooves, and the drill pipe interface 41 and the first interface 21 are frustum-shaped protrusions. The connection with a frustum is more convenient for installation and the torque transmission is more uniform.

[0049] A number of guiding edges 42 are circumferentially distributed on the outer periphery of the drill pipe 4, and each guiding edge 42 extends along the axial direction of the drill pipe 4. The arrangement of the guiding edges 42 not only plays a supporting role for the drill pipe 4, but also forms a slag discharge space between the casing body 13 and the drill pipe 4. The maximum diameter of the guiding edges 42 is 1 - 2 mm smaller than the inner diameter of the casing body 13. The arrangement of the guiding edges 42 not only plays a supporting role for the drill pipe 4, but also forms a slag discharge space between the casing body 13 and the drill pipe 4.

[0050] The downhole steering sleeve 12 is provided with a number of circumferentially distributed slag discharge holes 121, the slag discharge holes 121 penetrate through the wall surface of the downhole steering sleeve 12, and the slag discharge holes 121 are located on the side of the annular protrusion 11 away from the drill bit 3. The soil slag around the cutting edge 32 of the drill bit 3 is squeezed backward along the outer surfaces of the drill bit 3 and the casing assembly 1, enters the casing assembly 1 through the slag discharge holes 121, and is discharged backward from the gap between the casing assembly 1 and the drill pipe 4.

[0051] Embodiment 2, as Figures 8-10 shown, a device for opening an inclined hole on the outer tunnel slope of a TBM shield, wherein, the full-face hard rock tunneling machine (TBM) includes various types of shield machines, including the drill bit 3 and the drill pipe 4, a grouting conduit 5 communicating with the tunnel rock wall 6 is arranged on the side of the TBM shield 7, the inclined hole opening tooling of Embodiment 1 is used for opening the hole, the drill bit 3 is detachably connected to the transition connecting member 2, the drill pipe 4 is detachably connected to the transition connecting member 2, and the casing assembly 1 is sleeved inside the grouting conduit 5.

[0052] During use, the casing assembly 1 is installed and used inside the grouting conduit 5. Since the contact area between the casing assembly 1 and the grouting conduit 5 is larger than the contact area between the casing assembly 1 and the drilling assembly 1, the frictional force between the casing assembly 1 and the grouting conduit 5 is greater than the frictional force between the casing assembly 1 and the drilling assembly 1. Therefore, the casing assembly 1 will not rotate with the drilling assembly 1, and thus the casing assembly 1 will not cause damage to the grouting conduit 5. In order to further prevent the casing assembly 1 from rotating with the drilling assembly 1, the friction coefficient of the inner side wall surface of the casing assembly 1 is smaller than that of the outer side wall surface of the casing assembly 1.

[0053] The outer diameter of the drill bit 3 is smaller than the inner diameter of the grouting conduit 5, so that the drill bit 3 can be inserted into the grouting conduit 5 after installation, which makes the installation more convenient.

[0054] During use, as the drilling depth increases, after the drill - with - guide sleeve 12 leaves the grouting conduit 5, the sleeve body 13 continues to support inside the grouting conduit 5 to provide support for the drilling assembly 1.

[0055] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above - mentioned embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A bevel hole drilling tool, used for drilling holes in cooperation with a drill bit (3) and a drill rod (4), characterized in that: include: A sleeve assembly (1), wherein an annular protrusion (11) is circumferentially arranged on the inner wall of the sleeve assembly (1); A transition connector (2) is inserted into the casing assembly (1), and an annular groove (23) is circumferentially provided on the outer wall of the transition connector (2) and is clearance-matched with the annular protrusion (11). One end of the transition connector (2) is provided with a first interface (21) for detachably connecting a drill bit (3), and the other end is provided with a second interface (22) for detachably connecting a drill rod (4).

2. The inclined surface opening tool according to claim 1, characterized in that: The drill bit (3) is provided with a drill bit interface (31) that is the same as the second interface (22), and the drill rod (4) is provided with a drill rod interface (41) that is the same as the first interface (21).

3. The inclined surface opening tool according to claim 1, characterized in that: The casing assembly (1) comprises a drilling guide sleeve (12) and a casing body (13) detachably connected to the drilling guide sleeve (12); the drilling guide sleeve (12) is located on a side close to the drill bit (3) and the annular protrusion (11) is located on the inner circumference of the drilling guide sleeve (12).

4. The inclined surface opening tool according to claim 3, characterized in that: The blade portion (32) of the drill bit (3) is exposed outside the drilling guide sleeve (12), and the inner surface of the drilling guide sleeve (12) is clearance-matched with the outer surface of the tail portion (33) of the drill bit (3).

5. The bevel hole punching tool according to any one of claims 1 to 4, characterized in that: The tail portion (33) of the drill bit (3) is axially abutted against the side of the annular protrusion (11) facing the blade portion (32) of the drill bit (3).

6. The inclined surface hole punching tool according to claim 2, characterized in that: The drill bit interface (31) and the second interface (22) are truncated cone-shaped grooves, and the drill rod interface (41) and the first interface (21) are truncated cone-shaped protrusions.

7. The inclined surface drilling tool according to any one of claims 1 to 4, characterized in that: A plurality of guide ridges (42) are distributed circumferentially on the outer circumference of the drill rod (4), and each guide ridge (42) extends along the axial direction of the drill rod (4).

8. The inclined surface drilling tool according to claim 3 or 4, characterized in that: The drilling guide sleeve (12) is provided with a plurality of circumferentially distributed slag discharge holes (121), the slag discharge holes (121) passing through the wall surface of the drilling guide sleeve (12), and the slag discharge holes (121) are located on a side of the annular protrusion (11) away from the drill bit (3).

9. A device for drilling a hole on an inclined surface of a tunnel outside a TBM shield, comprising a drill bit (3) and a drill rod (4), a grouting conduit (5) connected to a tunnel rock wall (6) being arranged on the side of the TBM shield (7), characterized in that: The bevel hole drilling tool described in any one of claims 1 to 8 is used to drill a hole, the drill bit (3) is detachably connected to the transition connector (2), the drill rod (4) is detachably connected to the transition connector (2), and the casing assembly (1) is inserted into the interior of the grouting conduit (5).

10. The device for opening a hole on the inclined surface of a TBM shield outer tunnel according to claim 9, characterized in that: The outer diameter of the drill bit (3) is smaller than the inner diameter of the grouting conduit (5).

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