Pipe shed drill rod mechanism

Abstract

The utility model discloses a pipe shed drill rod mechanism, which belongs to the technical field of tunnel support construction drill rod equipment, and comprises a pipe shed drill rod mechanism, a drill rod used for being connected with a pipe shed and a drill bit positioned at the head part of the drill rod, the drill rod comprises a head section drill rod, a common drill rod in threaded connection with the tail end of the head section drill rod, and a limiting device positioned at the tail end of the common drill rod; the drill bit comprises a main drill bit and an auxiliary drill bit; the main drill bit comprises a main drill bit body and a cutter head arranged at the head end of the main drill bit body, a hollow inner cavity is formed in the main drill bit body, and at least two wedge-shaped cutter working groove holes are formed in the side wall of the inner cavity; the auxiliary drill bit comprises an auxiliary drill bit main body, wedge-shaped cutters with the same number as the wedge-shaped cutter working groove holes are movably connected to the position, close to the head end, of the auxiliary drill bit main body, and the main drill bit main body is in threaded connection with the first-section drill rod. Due to the structure, the drill bit and the drill rod can be recycled easily, construction efficiency is improved, and construction cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of drilling equipment for tunnel support construction, and provides a pipe roof drilling mechanism that facilitates the recovery of drill bits and drill rods, improves construction efficiency, and reduces construction costs. Background Technology

[0002] During tunnel construction, the specific support method involves workers drilling holes in the tunnel face beforehand, inserting steel pipes into the holes, and then injecting grout into the steel pipes at the ends inserted into the holes. The grout flows through the injection holes and fills the gaps in the tunnel structure, and the grout consolidates the loose rock layers in the unexcavated parts of the tunnel, thereby achieving the effect of pre-reinforcement.

[0003] The conventional pipe roof construction method involves drilling holes at certain intervals along the outline of the excavation section before tunnel excavation, inserting steel pipes, and then injecting grout into the inserted steel pipes to increase the shear strength of the surrounding rock, thereby maintaining or even increasing the self-supporting capacity of the weak surrounding rock, ensuring the stability of the surrounding rock, and preventing collapse caused by tunnel excavation.

[0004] Currently, the pipe roof method is mostly used in mountain tunnels, especially suitable for areas with weak and fractured surrounding rock, landslides, and rock piles where the surrounding rock pressure is high and the requirements for deformation of the surrounding rock and the surface are high. However, the surrounding rock in this stratum is generally loose and has poor stability. Existing pipe roof drill rod mechanisms include drill rods located in the pipe roof, drill bits set at the head of the drill rods, and cutterheads set on the drill bits. Due to the time difference between drilling and steel pipe installation, this type of pipe roof drill rod mechanism is prone to hole collapse and drill jamming, resulting in difficulties in retrieving the drill bits and drill rods, low efficiency, and poor economic benefits. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a pipe roof drill rod mechanism that facilitates the recycling of drill bits and drill rods, improves construction efficiency, and reduces construction costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a pipe roof drill rod mechanism, including a drill rod for connecting to a pipe roof, a drill bit located at the head of the drill rod, wherein: the drill rod includes a first section of drill rod, a general drill rod threadedly connected to the tail end of the first section of drill rod, and a limiting device located at the tail end of the general drill rod;

[0008] The drill bit includes a main drill bit and an auxiliary drill bit. The main drill bit includes a main drill bit body and a cutterhead disposed at the head end of the main drill bit body. The main drill bit body has a hollow inner cavity, and at least two wedge-shaped cutter working slots are provided on the side wall of the inner cavity. The head of the auxiliary drill bit extends into the inner cavity of the main drill bit body. The auxiliary drill bit includes an auxiliary drill bit body, and a number of wedge-shaped cutters, the same as the number of wedge-shaped cutter working slots, are movably connected to the auxiliary drill bit body near the head end. The main drill bit body is threadedly connected to the first section of the drill rod. Under normal conditions, the outer end of the wedge-shaped cutter is pressed against the inner wall of the inner cavity of the main drill bit body. When in use, the outer end of the wedge-shaped cutter extends out of the wedge-shaped cutter working slot and is located outside the outer wall of the main drill bit.

[0009] The first section of the drill rod has the same structure as a general drill rod, both including a hollow steel cylinder. A solid support rod is installed inside the hollow steel cylinder. Four fan-shaped steel bars are evenly distributed on the outer wall of the solid support rod. These four fan-shaped steel bars are simultaneously wedged into the outer wall of the solid support rod and the inner wall of the hollow steel cylinder, fixing the hollow steel cylinder and the solid support rod together as one unit. A sliding groove is formed between two adjacent fan-shaped steel bars. Three limiting blocks are evenly distributed on the outer wall of the hollow steel cylinder near the head position. At least two spherical rollers are evenly distributed on the outer wall of the hollow steel cylinder near the tail position. The main body of the auxiliary drill bit is threadedly connected to the solid support rod of the first section of the drill rod, and the solid support rod of the first section of the drill rod is threadedly connected to the solid support rod of a general drill rod.

[0010] The limiting device includes a plugging head, the inner cavity of which has an axially arranged plugging block mounting groove, and the inner cavity of which has a first limiting groove and a second limiting groove in the radial direction; a limiting head is provided in the inner cavity of the plugging head, and a plugging block matching the plugging block mounting groove is provided on the outer wall of the limiting head, the plugging block connecting the plugging head and the limiting head into one unit; the plugging head is threadedly connected to the solid support rod of a general drill pipe.

[0011] To effectively ensure the excavation function of the pipe roof drill rod mechanism described in this solution, the following further applies to the above solution: the diameter of the second cutterhead formed by the wedge cutter is 5%-10% larger than the diameter of the cutterhead.

[0012] To ensure the rotational performance of the pipe roof drill rod mechanism on the pipe roof, the above scheme further includes: a limiting ring integrally formed with the pipe roof is provided at the tail end of the inner cavity of the pipe roof, and the spherical roller of the first section of the drill rod or a general drill rod is located in the limiting ring.

[0013] To facilitate the installation of the wedge cutter, the above scheme further includes: the wedge cutter is hinged to the auxiliary drill bit body via a ring shaft, and under the action of external force, the wedge cutter swings on the ring shaft and extends or retracts in the radial direction of the auxiliary drill bit body.

[0014] The beneficial effects of this utility model are:

[0015] 1. It achieves adjustable hole enlargement size within a certain range. With the aid of limiting devices of different specifications, different hole enlargement ranges can be achieved by changing the degree of unfolding of the cutter head.

[0016] 2. High safety. It avoids borehole collapse caused by the time difference during drilling and steel pipe installation, greatly improving safety during tunneling with pipe in place.

[0017] 3. High economic benefits. It avoids the waste caused by the drill bit being unable to be removed after construction.

[0018] 4. No special working platform or guide pipe needs to be built during construction, which can fully ensure the safety and pipeline installation quality in the limited working space during tunnel construction.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a three-dimensional structural diagram of the main drill bit of this utility model from one direction;

[0023] Figure 3 This is a three-dimensional structural diagram of the main drill bit of this utility model from another direction;

[0024] Figure 4 This is a three-dimensional structural diagram of the auxiliary drill bit of this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the wedge-shaped cutter of the auxiliary drill bit of this utility model;

[0026] Figure 6 This is a three-dimensional structural diagram of the annular shaft of the auxiliary drill bit of this utility model;

[0027] Figure 7 This is a three-dimensional structural diagram of the first section of the drill rod or a general drill rod of this utility model;

[0028] Figure 8 for Figure 7 A schematic diagram of the structure from a side view;

[0029] Figure 9 This is a schematic diagram of the limiting device of this utility model;

[0030] Figure 10 for Figure 9 A schematic diagram of the structure when the lower limit head is removed;

[0031] Figure 11 This is a schematic diagram of the structure at the limiting head;

[0032] Figure 12 This is a schematic diagram of the structure of this utility model with a pipe shed installed;

[0033] Figure 13 This is a structural schematic diagram of a pipe shed.

[0034] Reference numerals in the attached drawings: 1. Drill bit; 2. First section of drill rod; 3. General drill rod; 4. Limiting device; 5. Cutterhead; 6. Main drill bit body; 7. Secondary drill bit body; 8. Wedge cutter; 9. Slide groove; 10. Solid support rod; 11. Limiting block; 12. Ring shaft; 13. Spherical roller; 14. Sealing head; 15. Limiting head; 16. First limiting groove; 17. Second limiting groove; 18. Pipe roof; 19. Limiting ring; 20. Main drill bit; 21. Secondary drill bit; 22. Wedge cutter working slot; 23. Hollow steel cylinder; 24. Fan-shaped steel bar; 25. Sealing block mounting groove; 26. Sealing block. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Where there is no conflict, the following embodiments and features can be combined with each other.

[0036] Furthermore, the reference numbers and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0037] like Figures 1 to 13 As shown, the pipe roof drill rod mechanism of this utility model includes a drill rod for connecting with the pipe roof 18, a drill bit 1 located at the head of the drill rod, wherein: the drill rod includes a first section drill rod 2, a general drill rod 3 threadedly connected to the tail end of the first section drill rod 2, and a limiting device 4 located at the tail end of the general drill rod 3.

[0038] The drill bit 1 includes a main drill bit 20 and an auxiliary drill bit 21. The main drill bit 20 includes a main drill bit body 6 and a cutter head 5 disposed at the head end of the main drill bit body 6. The main drill bit body 6 has a hollow inner cavity, and at least two wedge-shaped cutter working slots 22 are provided on the side wall of the inner cavity. The head of the auxiliary drill bit 21 extends into the inner cavity of the main drill bit body 6. The auxiliary drill bit 21 includes an auxiliary drill bit body 7. The auxiliary drill bit body 7 has a number of wedge-shaped cutters 8 connected movably near the head end, the same number as the wedge-shaped cutter working slots 22. The main drill bit body 6 is threadedly connected to the first section of drill rod 2. Under normal conditions, the outer end of the wedge-shaped cutter 8 is tightly pressed against the inner wall of the inner cavity of the main drill bit body 6. When in use, the outer end of the wedge-shaped cutter 8 extends out of the wedge-shaped cutter working slots 22 and is located outside the outer wall of the main drill bit 20.

[0039] The first section of drill rod 2 has the same structure as the general drill rod 3, both including a hollow steel cylinder 23. A solid support rod 10 is provided in the inner cavity of the hollow steel cylinder 23. Four fan-shaped steel bars 24 are evenly distributed on the outer wall of the solid support rod 10. The four fan-shaped steel bars 24 are simultaneously wedged into the outer wall of the solid support rod 10 and the inner wall of the hollow steel cylinder 23, fixing the hollow steel cylinder 23 and the solid support rod 10 together. A sliding groove 9 is formed between two adjacent fan-shaped steel bars 24. Three limiting blocks 11 are evenly distributed on the outer wall of the hollow steel cylinder 23 near the head position. At least two spherical rollers 13 are evenly distributed on the outer wall of the hollow steel cylinder 23 near the tail position. The auxiliary drill bit body 7 is threadedly connected to the solid support rod 10 of the first section of drill rod 2, and the solid support rod 10 of the first section of drill rod 2 is threadedly connected to the solid support rod 10 of the general drill rod 3.

[0040] The limiting device 4 includes a plugging head 14, with a plugging block mounting groove 25 arranged axially in the inner cavity of the plugging head 14, and a first limiting groove 16 and a second limiting groove 17 arranged radially in the inner cavity of the plugging head 14; a limiting head 15 is provided in the inner cavity of the plugging head 14, and a plugging block 26 matching the plugging block mounting groove 25 is provided on the outer wall of the limiting head 15, the plugging block 26 connecting the plugging head 14 and the limiting head 15 into one unit; the plugging head 14 is threadedly connected to the solid support rod 10 of the general drill rod 3. In this embodiment, the main drill bit body 6 and the auxiliary drill bit body 7 form the drill bit body part, and the drill bit body part and the limiting device composed of the first section of drill rod 2, the general drill rod 3, the plugging head 14 and the limiting head 15 are threadedly connected to each other. In this embodiment, the limiting device 4 effectively prevents the solid support rod 10 from sliding during operation, and the sliding groove 9 facilitates the removal of the solid support rod 10 after construction is completed; the limiting device 4 adopts a commercially available pneumatic drill limiting device, threaded sleeve limiting device or disc-shaped limiting device.

[0041] To effectively ensure the excavation function of the pipe roof drilling rod mechanism described in this solution, in the above embodiment, preferably, the diameter of the second cutterhead formed by the wedge cutter 8 is 5%-10% larger than the diameter of the cutterhead 5.

[0042] To ensure the rotational performance of the pipe roof drill rod mechanism on the pipe roof 18, in the above embodiment, preferably, a limiting ring 19 integral with the inner end of the inner cavity of the pipe roof 18 is provided, and the spherical roller 13 of the first section of the drill rod 2 or the general drill rod 3 is located in the limiting ring 19.

[0043] To facilitate the installation of the wedge cutter 8, in the above embodiment, preferably, the wedge cutter 8 is hinged to the auxiliary drill bit body 7 via a ring shaft 12, and under the action of external force, the wedge cutter 8 swings on the ring shaft 12 and extends or retracts in the radial direction of the auxiliary drill bit body 7.

[0044] In the above embodiments, all components are commercially available products.

[0045] The process of using the structure described above includes the following steps:

[0046] Step 1: Positioning the rock drilling rig.

[0047] Step 2: Assemble drill bit 1. Retract the wedge cutter 8 of the auxiliary drill bit 21 and embed it into the inner cavity of the pre-set wedge cutter working slot 22 inside the main drill bit 20.

[0048] Step 2: Connect the drill rod. Fit the main drill bit 20 onto the head of the auxiliary drill bit 21 and connect them as one piece. Thread the auxiliary drill bit 21 onto the head of the first section of drill rod 2. Thread the head of the general drill rod 3 to the tail of the first section of drill rod 2. Thread the limiting head 15 of the limiting device 4 to the solid support rod 10 inside the general drill rod 3. At this point, the total length of the drill rod should be longer than the length of the first section of pipe roof 18.

[0049] Step 3, positioning with pipe. Move the connected drill rod longitudinally within the pipe roof 18 to the pre-welded limiting ring 19 within the pipe roof 18. Apply grease to the limiting block 11 outside the first section of drill rod 2, the limiting ring 19 inside the pipe roof 18, and the spherical roller 13 at the tail of the drill rod (generally the spherical roller 13 at the tail of drill rod 3) to reduce friction.

[0050] Step 4: Extend the auxiliary drill bit 21. Similar to manually opening an umbrella, pull the pre-connected limiting head 15 and solid support rod 10 backward a certain distance, so that the auxiliary drill bit 21 moves at the wedge-shaped cutter working slot 22 set inside the main drill bit 20. The four wedge cutters 8 also move at the wedge-shaped cutter working slot 22 until they are fully extended. At this time, insert the limiting head 15 into the sealing head 14 and twist it so that the fan-shaped structure at the tail of the limiting head 15 is exactly in the second limiting groove 16. While fixing the wedge cutters 8, fix the sealing head 14 to the pusher head of the rock drilling rig.

[0051] Step 5, First-stage drilling. Drilling begins. During drilling, the pipe roof 18 is propelled forward by the limiting block 11 welded to the front end of the first-stage drill rod 2, thus moving forward with the pipe. Furthermore, the spherical roller 13 stabilizes the pipe roof 18, reducing collisions between the pipe roof 18 and the drill rod due to shaking during drilling.

[0052] Step Six: General Drilling. When the first pipe roof section is dragged to the predetermined depth, disengage the limiting device 4 from the tail of the general drill rod 3. Connect the second pipe roof section and the second general drill rod section via threads. Following Step Four, connect the limiting device 4 to the tail of the second general drill rod section 3 via threads and secure the limiting device 4, keeping the wedge cutter 8 in the extended state. Drilling can then begin, and subsequent pipe roof construction steps follow the same procedure.

[0053] Step 7: Retract the auxiliary drill bit 21. When the last section of pipe roof construction is completed, the limiting device 4 is twisted in the opposite direction and pushed forward in a manner similar to manually retracting an umbrella, so that it is in the limiting position of the second limiting groove 17. The twisting fixes the limiting head 15 in the second limiting groove 17. At this time, the auxiliary drill bit 21 moves forward as a whole with the solid support rod 10 and the limiting head 15. The wedge cutter 8 also moves with the auxiliary drill bit 21 and is retracted into the space set inside the main drill bit body 6.

[0054] Step 8: Pull out the drill rod. Keep the limiting device 4 in the second limiting groove 17, disassemble the drill rod section by section, and finally pull out the drill bit.

[0055] Step 9: Grouting.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A pipe roof drill rod mechanism, comprising a drill rod for connection to a pipe roof (18), and a drill bit (1) located at the head of the drill rod, characterized in that: The drill rod includes a first section drill rod (2), a general drill rod (3) threadedly connected to the tail end of the first section drill rod (2), and a limiting device (4) located at the tail end of the general drill rod (3); The drill bit (1) includes a main drill bit (20) and an auxiliary drill bit (21); the main drill bit (20) includes a main drill bit body (6) and a cutter head (5) disposed at the head end of the main drill bit body (6). The main drill bit body (6) has a hollow inner cavity, and at least two wedge-shaped cutter working slots (22) are provided on the side wall of the inner cavity; the head of the auxiliary drill bit (21) extends into the inner cavity of the main drill bit body (6), and the auxiliary drill bit (21) includes an auxiliary drill bit. The main body (7) of the drill bit has a number of wedge cutters (8) connected movably near the head end of the auxiliary drill bit body (7), the same number as the wedge cutter working slots (22). The main drill bit body (6) is threadedly connected to the first section of the drill rod (2). Under normal conditions, the outer end of the wedge cutter (8) is tightly pressed against the inner wall of the inner cavity of the main drill bit body (6). When in use, the outer end of the wedge cutter (8) extends out of the wedge cutter working slots (22) and is located outside the outer wall of the main drill bit (20). The first section of the drill rod (2) has the same structure as the general drill rod (3), both of which include a hollow steel cylinder (23). A solid support rod (10) is installed in the inner cavity of the hollow steel cylinder (23). Four fan-shaped steel bars (24) are evenly distributed on the outer wall of the solid support rod (10). The four fan-shaped steel bars (24) are simultaneously wedged into the outer wall of the solid support rod (10) and the inner wall of the hollow steel cylinder (23), and fix the hollow steel cylinder (23) and the solid support rod (10) into one piece. Adjacent fan-shaped steel bars (24) are evenly distributed on the outer wall of the solid support rod (10) and the inner wall of the hollow steel cylinder (23). A groove (9) is formed between the steel bars (24); three limiting blocks (11) are evenly distributed on the outer wall of the hollow steel cylinder (23) near the head position; at least two spherical rollers (13) are evenly distributed on the outer wall of the hollow steel cylinder (23) near the tail position; the auxiliary drill bit body (7) is threadedly connected to the solid support rod (10) of the first section drill rod (2); the solid support rod (10) of the first section drill rod (2) is threadedly connected to the solid support rod (10) of the general drill rod (3); The limiting device (4) includes a plugging head (14), which has a plugging block mounting groove (25) in the axial direction of its inner cavity and a first limiting groove (16) and a second limiting groove (17) in the radial direction of its inner cavity. A limiting head (15) is provided in the inner cavity of the plugging head (14), and a plugging block (26) matching the plugging block mounting groove (25) is provided on the outer wall of the limiting head (15). The plugging block (26) connects the plugging head (14) and the limiting head (15) into one unit. The plugging head (14) is threadedly connected to the solid support rod (10) of a general drill rod (3).

2. The pipe roof drilling mechanism according to claim 1, characterized in that: The diameter of the second cutter head formed by the wedge cutter (8) is 5%-10% larger than the diameter of the cutter head (5).

3. The pipe roof drilling mechanism according to claim 1, characterized in that: A limiting ring (19) is provided at the tail end of the inner cavity of the pipe shed (18), and the spherical roller (13) of the first section of the drill rod (2) or the general drill rod (3) is located in the limiting ring (19).

4. The pipe roof drilling mechanism according to claim 1, characterized in that: The wedge cutter (8) is hinged to the auxiliary drill body (7) via a ring shaft (12). Under the action of external force, the wedge cutter (8) swings on the ring shaft (12) and extends or retracts in the radial direction of the auxiliary drill body (7).

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