A device and method for preventing hole collapse in soft rock tunnel anchor drilling

Abstract

The application discloses a device and method for preventing hole collapse in soft rock tunnel anchor rod drilling, and relates to the technical field of tunnel construction. The device comprises a drill rod, a drill bit and a fixing seat, one end of the drill rod is provided with the drill bit, the other end of the drill rod is provided with the fixing seat, the inside of the drill rod is a hollow structure, the inside of the drill rod is respectively provided with a first supporting block, a second supporting block and a third supporting block, the two ends of the second supporting block are respectively connected with a first telescopic part and a second telescopic part, one end of the first telescopic part is connected with the first supporting block, one end of the second telescopic part is connected with the third supporting block, the first supporting block, the second supporting block and the third supporting block are connected with a plurality of grouting pipes on the circumferential surface, and the input ends of the plurality of grouting pipes are adapted to the fixing seat. The application can effectively prevent hole collapse in drilling by introducing a plurality of supporting blocks into the drilling hole, pre-casting in the drilling hole by cooperating with the grouting pipes, forming four corner supports in the hole after molding, then inserting the anchor rod and performing secondary casting.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to a device and method for preventing collapse of anchor bolt drilling holes in soft rock tunnels. Background Technology

[0002] Soft rock refers to engineering rock mass that can undergo significant deformation under engineering forces. Soft rock tunnels are tunnels built in weak surrounding rock. Due to the characteristics of soft rock such as low strength, large deformation and softening when exposed to water, it brings certain difficulties to the design and construction of tunnels and even the long-term stability of the lining structure.

[0003] In the process of anchor bolt drilling in soft rock tunnels, traditional construction methods are limited by the special characteristics of soft rock, and there is a risk of borehole collapse. After the borehole collapses, the anchor bolts cannot be installed normally, resulting in the failure of the borehole and the need to re-drill, which affects the efficiency of tunnel construction. To this end, we propose a device and method for preventing borehole collapse in anchor bolt drilling in soft rock tunnels. Summary of the Invention

[0004] The main objective of this invention is to provide an apparatus and method for preventing collapse of anchor bolt holes in soft rock tunnels, in order to solve the problems mentioned in the background.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a device for drilling anti-collapse holes for anchor bolts in soft rock tunnels, comprising a drill rod, a drill bit, and a fixing base. A drill bit is installed at one end of the drill rod, and a fixing base is installed at the other end. The drill rod has a hollow internal structure, and a first support block, a second support block, and a third support block are respectively installed inside the drill rod. A first telescopic member and a second telescopic member are respectively connected to both ends of the second support block. One end of the first telescopic member is connected to the first support block, and one end of the second telescopic member is connected to the third support block. The peripheral surfaces of the first, second, and third support blocks are connected... The system is equipped with several grouting pipes. The input ends of the grouting pipes are adapted to the fixed base, and the output ends of the grouting pipes are adapted to the drill bit. Slider blocks are connected to the peripheral surfaces of the first, second, and third support blocks. A sliding groove is provided on the inner surface of the drill rod. The slider is adapted to the position of the sliding groove, and the slider and the sliding groove slide together. Chip removal holes are provided on the inner sides of the first, second, and third support blocks. A vacuum cleaner is installed on one side of the fixed base. A dust collection pipe is connected to one end of the vacuum cleaner. One end of the dust collection pipe passes through the fixed base, and the position of the dust collection pipe is adapted to the chip removal hole.

[0006] A front-end connector is connected to one side of the drill bit, and a fixing member is connected to one end of the front-end connector. One end of the fixing member is connected to the drill rod to install and connect the drill bit.

[0007] A connecting seat is installed at one end of the drill rod, and one end of the connecting seat is connected to the fixed seat. A rear connecting piece is connected to the other end of the connecting seat, and one end of the rear connecting piece is connected to the drill rod. The rear connecting piece connects and fixes the fixed seat.

[0008] A pad is installed on the outside of the drill rod, and the pad is movably connected to the drill rod. The surface of the pad is provided with several fixing holes to assist in fixing the anchor rod after it is drilled out.

[0009] A push plate is provided at one end of the drill rod, and a support rod is connected to one side of the push plate. One end of the support rod is connected to the third support block, which facilitates the unloading of the first support block, the second support block, and the third support block.

[0010] A connecting rod is installed on one side of the fixed base, and the connecting rod is threadedly connected to the fixed base, thereby connecting the fixed base.

[0011] An operating method for a device used for preventing collapse during anchor bolt drilling in soft rock tunnels includes the following steps:

[0012] Step 1: Connect the drive device using the connecting rod, drive the drill rod through the power source, and the drill bit drills into the rock wall;

[0013] Step 2: After drilling is completed, remove the drill rod and drill bit. Use the front connector and fixing parts to disassemble the drill bit and the fixing seat at the same time.

[0014] Step 3: Operate the push plate to guide the first support block, the second support block, and the third support block through the support rod, leaving the first support block, the second support block, and the third support block inside the hole;

[0015] Step 4: Use the grouting pipe to introduce concrete grout and pour it into the drilled hole. At this time, the anchor rod is inserted simultaneously, and the diameter of the anchor rod is adapted to the chip removal hole.

[0016] Step 5: Slide the pad out and let it fit against the rock wall. The inner side is connected and fixed to the anchor rod, completing the installation of the device for anchor rod drilling anti-collapse hole in soft rock tunnel.

[0017] In step 1, during the drilling process, a vacuum cleaner is used to suck up the rock cuttings through the dust collection pipe. The rock cuttings are led out along the cuttings discharge hole and discharged through the gap of the rear connecting part formed between the drill rod and the fixed seat, which is convenient to operate.

[0018] In step 3, the first support block, the second support block, and the third support block are extended in conjunction with the slider and the groove for support and sliding, which enhances the stability of operation.

[0019] The present invention has the following beneficial effects:

[0020] This invention relates to a device for preventing the collapse of anchor bolt drilling holes in soft rock tunnels. By introducing multiple sets of support blocks into the borehole and pre-casting the borehole with grouting pipes, the device forms four corner supports in the hole after molding. Then, the anchor bolt is inserted, and the borehole is then cast a second time, which strengthens the fixing stability of the anchor bolt and effectively prevents the borehole from collapsing.

[0021] The operation method of the device for drilling anti-collapse holes for anchor bolts in soft rock tunnels according to the present invention is smooth, highly integrated, easy to operate, and ensures safety in actual construction, thus having high promotion value. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the device for preventing collapse of anchor bolt drilling holes in soft rock tunnels according to the present invention;

[0023] Figure 2 This is a schematic diagram of the main structure of the device for preventing collapse of anchor bolt drilling holes in soft rock tunnels according to the present invention;

[0024] Figure 3 This invention relates to a device for preventing collapse during anchor bolt drilling in soft rock tunnels. Figure 2 A cross-sectional view of the AA plane;

[0025] Figure 4 This is a side view of the device for preventing collapse of anchor bolt drilling holes in soft rock tunnels according to the present invention.

[0026] Figure 5 This invention relates to a device for preventing collapse during anchor bolt drilling in soft rock tunnels. Figure 4 A cross-sectional view of the BB plane;

[0027] Figure 6 This is a schematic diagram of the bottom structure of the device for preventing collapse of anchor bolt drilling holes in soft rock tunnels according to the present invention;

[0028] Figure 7 This invention relates to a device for preventing collapse during anchor bolt drilling in soft rock tunnels. Figure 1 A magnified view of a section at point A in the middle;

[0029] Figure 8 This is a flowchart illustrating the operation method of the device for preventing collapse during anchor bolt drilling in soft rock tunnels according to the present invention.

[0030] In the diagram: 1. Drill rod; 2. Drill bit; 3. Front connector; 4. Fixing component; 5. Rear connector; 6. Pad; 7. Fixing hole; 8. Connecting seat; 9. Vacuum cleaner; 10. Dust collection pipe; 11. First support block; 12. First telescopic component; 13. Second support block; 14. Second telescopic component; 15. Third support block; 16. Grouting pipe; 17. Sliding block; 18. Slide groove; 19. Push plate; 20. Support rod; 21. Fixing seat; 22. Connecting rod; 23. Chip removal hole. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0032] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Example 1:

[0035] Please refer to Figures 1-7The device shown is for drilling anti-collapse holes for anchor bolts in soft rock tunnels, including a drill rod 1, a drill bit 2, and a fixing base 21. The drill bit 2 is installed at one end of the drill rod 1, and the fixing base 21 is installed at the other end. The drill rod 1 has a hollow internal structure, and a first support block 11, a second support block 13, and a third support block 15 are respectively installed inside the drill rod 1. A first telescopic member 12 and a second telescopic member 14 are respectively connected to both ends of the second support block 13. One end of the first telescopic member 12 is connected to the first support block 11, and one end of the second telescopic member 14 is connected to the third support block 15. A plurality of grouting pipes 16 are connected to the peripheral surfaces of the first support block 11, the second support block 13, and the third support block 15. The input ends of the plurality of grouting pipes 16 are connected to the fixing base 21. The base 21 is adapted to the output ends of several grouting pipes 16 and the drill bit 2. The peripheral surfaces of the first support block 11, the second support block 13 and the third support block 15 are all connected to sliders 17. The inner surface of the drill rod 1 is provided with a sliding groove 18. The sliders 17 and the sliding grooves 18 are adapted to each other and slide in cooperation. The inner sides of the first support block 11, the second support block 13 and the third support block 15 are all provided with chip removal holes 23. A vacuum cleaner 9 is installed on one side of the fixed base 21. One end of the vacuum cleaner 9 is connected to a dust collection pipe 10. One end of the dust collection pipe 10 passes through the fixed base 21 and is adapted to the position of the chip removal hole 23 to facilitate the discharge of dust. The vacuum cleaner 9 is threadedly connected to the fixed base 21.

[0036] A front connector 3 is connected to one side of the drill bit 2. A fixing member 4 is connected to one end of the front connector 3. One end of the fixing member 4 is connected to the drill rod 1. The front connector 3 and the fixing member 4 are used to connect and fix the drill bit 2. A connecting seat 8 is installed at one end of the drill rod 1. One end of the connecting seat 8 is connected to the fixing seat 21. The other end of the connecting seat 8 is connected to the rear connector 5. One end of the rear connector 5 is connected to the drill rod 1 to install and connect the fixing seat 21. A pad 6 is installed on the outside of the drill rod 1. The pad 6 is movably connected to the drill rod 1. Several fixing holes 7 are provided on the surface of the pad 6 for auxiliary fixing of the anchor rod and to enhance the stability of the anchor rod. A push plate 19 is provided at one end of the drill rod 1. A support rod 20 is connected to one side of the push plate 19. One end of the support rod 20 is connected to the third support block 15 to facilitate the guide of each support block to the drill hole. A connecting rod 22 is installed on one side of the fixing seat 21. The connecting rod 22 is threadedly connected to the fixing seat 21 and is connected to the power source.

[0037] In this scheme, drill bit 2 is used to drill into the rock wall. During the drilling process, dust collector 9 sucks up rock cuttings through dust collection pipe 10. The rock cuttings are led out along the cuttings discharge hole 23. After the drilling is completed, drill rod 1 and drill bit 2 are removed. The drill bits 2 at both ends and the fixing seat 21 are disassembled. The push plate 19 is operated to guide the support block through the support rod 20. The support block is left in the hole. Concrete grout is introduced through grouting pipe 16 to pour the hole. The anchor rod is extended in at the same time. After the concrete solidifies, the installation of the soft rock tunnel anchor rod is completed.

[0038] Example 2:

[0039] Please refer to Figure 8 The following describes the operation method of an apparatus for drilling anti-collapse holes for anchor bolts in soft rock tunnels: A driving device is connected via a connecting rod 22, and a power source drives the drill rod 1, while the drill bit 2 drills into the rock wall. During drilling, a vacuum cleaner 9 is used to suck up rock cuttings through a dust collection pipe 10. The rock cuttings are led out along the cuttings discharge hole 23 and discharged through the gap in the rear connecting piece 5 formed between the drill rod 1 and the fixed seat 21. After drilling is completed, the drill rod 1 and drill bit 2 are removed. The drill bit 2 is disassembled using the front connecting piece 3 and the fixed piece 4, and the fixed seat 21 is also disassembled. The push plate 19 is operated, and the support rod 20... The first support block 11, the second support block 13, and the third support block 15 are led out and left inside the hole. When the first support block 11, the second support block 13, and the third support block 15 are led out, they are supported and slid with the slider 17 and the groove 18. Concrete grout is introduced through the grouting pipe 16 to pour the borehole. At this time, the anchor rod is extended in simultaneously. The diameter of the anchor rod is adapted to the chip removal hole 23. The pad plate 6 is slid out and fits against the rock wall. The inner side is connected and fixed to the anchor rod, thus completing the installation of the device for the anchor rod drilling anti-collapse hole in soft rock tunnel.

[0040] In this embodiment, the first telescopic member 12 and the second telescopic member 14 are used to adjust the support length between the first support block 11 and the second support block 13, the second support block 13 and the third support block 15 to adapt to the drilling depth. In this embodiment, the rated output power of the vacuum cleaner 9 is 3.2kW.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An operating method for a device used for drilling anti-collapse holes for anchor bolts in soft rock tunnels, characterized in that, The device includes a drill rod (1), a drill bit (2) and a fixed seat (21). The drill bit (2) is installed at one end of the drill rod (1) and the fixed seat (21) is installed at the other end of the drill rod (1). The drill rod (1) has a hollow structure inside. A first support block (11), a second support block (13) and a third support block (15) are installed inside the drill rod (1). A first telescopic member (12) and a second telescopic member (14) are connected to both ends of the second support block (13). One end of the first telescopic member (12) is connected to the first support block (11), and one end of the second telescopic member (14) is connected to the third support block (15). The first support block (11), the second support block (13) and the third support block (15) are connected to a plurality of grouting pipes (16). The input end of the plurality of grouting pipes (16) is adapted to the fixed seat (21), and the output end of the plurality of grouting pipes (16) is adapted to the drill bit (2). The peripheral surfaces of the first support block (11), the second support block (13) and the third support block (15) are all connected to sliders (17). The inner surface of the drill rod (1) is provided with a sliding groove (18). The sliders (17) are adapted to the sliding grooves (18), and the sliders (17) and the sliding grooves (18) are in sliding fit. The first support block (11), the second support block (13) and the third support block (15) are all provided with chip removal holes (23) on their inner sides. A vacuum cleaner (9) is installed on one side of the fixed base (21). One end of the vacuum cleaner (9) is connected to a dust collection pipe (10). One end of the dust collection pipe (10) passes through the fixed base (21) and the position of one end of the dust collection pipe (10) is adapted to the chip removal hole (23). A connecting rod (22) is installed on one side of the fixed base (21), and the connecting rod (22) is threadedly connected to the fixed base (21); The drill bit (2) is connected to a front end connector (3) on one side, and a fixing member (4) is connected to one end of the front end connector (3). One end of the fixing member (4) is connected to the drill rod (1). The drill rod (1) has a push plate (19) at one end inside, and a support rod (20) is connected to one side of the push plate (19). One end of the support rod (20) is connected to the third support block (15). The operation method includes the following steps: Step 1: Connect the drive device using the connecting rod (22), drive the drill rod (1) through the power source, and drill bit (2) drills into the rock wall; Step 2: After drilling is completed, remove the drill rod (1) and drill bit (2), and use the front connector (3) to disassemble the drill bit (2) through the fixing part (4), and at the same time disassemble the fixing seat (21); Step 3: Operate the push plate (19) to guide the first support block (11), the second support block (13) and the third support block (15) through the support rod (20), leaving the first support block (11), the second support block (13) and the third support block (15) in the hole; Step 4: Use the grouting pipe (16) to introduce concrete grout and pour it into the borehole. At this time, the anchor rod is inserted simultaneously, and the diameter of the anchor rod is adapted to the chip removal hole (23). Step 5: Slide the pad (6) out and let it fit against the rock wall. The inner side is connected and fixed to the anchor rod, thus completing the installation of the device for anchor rod drilling anti-collapse hole in soft rock tunnel.

2. The device for preventing collapse during anchor bolt drilling in soft rock tunnels according to claim 1, characterized in that: A connecting seat (8) is installed at one end of the drill rod (1). One end of the connecting seat (8) is connected to the fixed seat (21). The other end of the connecting seat (8) is connected to a rear end connector (5). One end of the rear end connector (5) is connected to the drill rod (1).

3. The device for preventing collapse during anchor bolt drilling in soft rock tunnels according to claim 1, characterized in that: A pad (6) is installed on the outside of the drill rod (1). The pad (6) is movably connected to the drill rod (1). Several fixing holes (7) are provided on the surface of the pad (6).

4. The operating method of the device for preventing collapse during anchor bolt drilling in soft rock tunnels according to claim 1, characterized in that: In step 1, the drill bit (2) uses a vacuum cleaner (9) to suck up the rock cuttings through the dust collection pipe (10) during the drilling process. The rock cuttings are led out along the chip discharge hole (23) and discharged through the gap of the rear end connector (5) formed between the drill rod (1) and the fixed seat (21).

5. The operating method of the device for preventing collapse during anchor bolt drilling in soft rock tunnels according to claim 1, characterized in that: In step 3, the first support block (11), the second support block (13) and the third support block (15) are assisted by the slider (17) and the groove (18) for support and sliding when they are exported.

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