Grouting drill hole collapse prevention drill bit
By designing a grouting drill bit to prevent borehole collapse, the problem of easy borehole collapse and karst cave collapse in sand layers was solved, achieving stable drilling and controlling the amount of grout, thus ensuring the smooth progress of shield tunneling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-03-20
AI Technical Summary
Existing grouting drill bits are prone to hole collapse during drilling and grouting, and there is a risk of collapse during the treatment of karst caves, which affects the normal progress of shield tunneling.
A grouting drill bit designed to prevent borehole collapse has been developed. The diameter of the drill bit is the same as that of the drill rod. An adjustable grouting port is provided, and the grouting volume is controlled by a flow-limiting structure to prevent borehole collapse.
This effectively prevented sand layer collapse and karst cave collapse, ensuring the normal progress of shield tunneling.
Smart Images
Figure CN224017181U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a shield construction technical field, concretely is a grouting anti -drilling hole collapse drill bit. BACKGROUND
[0002] Shield construction is a kind of full mechanization construction method in subsurface excavation method construction.It is to push forward shield machine in ground, and the surrounding rock around shield shell and segment is supported to prevent collapse into tunnel.In the shield construction, the surrounding geological environment needs to be detected, when there is soil cave, directly carrying out shield construction can cause soil cave collapse, and further cause the risk of ground subsidence and collapse, so grouting drill bit is needed to carry out grouting treatment to soil cave, to ensure the normal progress of subsequent shield construction.
[0003] In the design process of the utility model, it is found that the prior art has the following problems: the common grouting drill bit is prone to hole collapse when drilling and grouting soil cave, there is a risk of collapse in the process of soil cave treatment, it is inconvenient to carry out soil cave grouting operation, and further affect the normal progress of subsequent shield construction. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a grouting anti -drilling hole collapse drill bit to solve the problem that the common grouting drill bit is prone to hole collapse when drilling and grouting soil cave, there is a risk of collapse in the process of soil cave treatment, it is inconvenient to carry out soil cave grouting operation, and further affect the normal progress of subsequent shield construction.
[0005] To achieve the above object, the utility model provides the following technical scheme: a grouting anti -drilling hole collapse drill bit, including drill bit body, the bottom of drill bit body is welded with drill bit, the top center of drill bit body is welded with butt joint part, the outside of butt joint part is sleeved with flow limiting sleeve, the top of butt joint part is connected with drill rod with screw thread.
[0006] The top of butt joint part penetrates and is equipped with grouting hole, the both sides of butt joint part bottom outer wall are equipped with limit block, the top outer wall of butt joint part is inlaid with screw groove.
[0007] The center of flow limiting sleeve penetrates and is equipped with through groove, the bottom of flow limiting sleeve is welded with flow limiting disc, the both sides of through groove bottom inner wall are inlaid with first limit slot, one side of first limit slot is equipped with second limit slot, the top of flow limiting disc penetrates and is equipped with first flow limiting hole, one side of first flow limiting hole is equipped with second flow limiting hole.
[0008] Further preferably, the drill bit body is internally penetrated by four U-shaped flow guide pipes, and the center of one end of the four U-shaped flow guide pipes is the same as the center of the top of the drill bit body, and the top of the one end of the four U-shaped flow guide pipes is communicated with the bottom of the delivery hole, and the other end of the four U-shaped flow guide pipes is penetrated around the top of the drill bit body.
[0009] Further preferably, the drill bit body is internally penetrated by four U-shaped flow guide pipes, and the center of one end of the four U-shaped flow guide pipes is the same as the center of the top of the drill bit body, and the top of the one end of the four U-shaped flow guide pipes is communicated with the bottom of the delivery hole, and the other end of the four U-shaped flow guide pipes is penetrated around the top of the drill bit body.
[0010] Further preferably, the drill bit body is internally penetrated by four U-shaped flow guide pipes, and the center of one end of the four U-shaped flow guide pipes is the same as the center of the top of the drill bit body, and the top of the one end of the four U-shaped flow guide pipes is communicated with the bottom of the delivery hole, and the other end of the four U-shaped flow guide pipes is penetrated around the top of the drill bit body.
[0011] Further preferably, the drill bit body is internally penetrated by four U-shaped flow guide pipes, and the center of one end of the four U-shaped flow guide pipes is the same as the center of the top of the drill bit body, and the top of the one end of the four U-shaped flow guide pipes is communicated with the bottom of the delivery hole, and the other end of the four U-shaped flow guide pipes is penetrated around the top of the drill bit body.
[0012] Further preferably, the drill bit body is internally penetrated by four U-shaped flow guide pipes, and the center of one end of the four U-shaped flow guide pipes is the same as the center of the top of the drill bit body, and the top of the one end of the four U-shaped flow guide pipes is communicated with the bottom of the delivery hole, and the other end of the four U-shaped flow guide pipes is penetrated around the top of the drill bit body.
[0013] Further preferably, the drill bit body is internally penetrated by four U-shaped flow guide pipes, and the center of one end of the four U-shaped flow guide pipes is the same as the center of the top of the drill bit body, and the top of the one end of the four U-shaped flow guide pipes is communicated with the bottom of the delivery hole, and the other end of the four U-shaped flow guide pipes is penetrated around the top of the drill bit body.
[0014] Compared with the prior art, the diameter of the grouting drill bit is the same as the diameter of the drill rod, which avoids hole collapse of the sand layer during drilling, reduces the risk of collapse during the treatment process of the karst cave, and controls the single grouting amount by setting the grouting hole of the grouting drill bit as an adjustable structure, thereby avoiding the risk of collapse of the karst cave caused by excessive single grouting, facilitating the grouting operation of the karst cave, and ensuring the normal progress of subsequent shield construction. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a front view structural schematic diagram of the utility model;
[0016] Figure 2 It is a front view structural schematic diagram of the utility model;
[0017] Figure 3 It is an enlarged front view structural schematic diagram of the drill bit body of the utility model;
[0018] Figure 4 The bottom view amplification structure schematic diagram of the flow limiting sleeve of the utility model;
[0019] Figure 5 The explosion amplification structure schematic diagram when the limiting block and the first limiting groove of the utility model butt joint;
[0020] Figure 6 The explosion amplification structure schematic diagram when the limiting block and the second limiting groove butt joint.
[0021] In the figure: 1, drill bit body;101, flow guide pipe;2, drill cutter;3, butt joint part;301, delivery propeller hole;302, limiting block;303, threaded groove;4, flow limiting sleeve;401, through slot;402, flow limiting disc;403, first limiting groove;404, second limiting groove;405, first flow limiting hole;406, second flow limiting hole;5, drill rod. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0023] Please refer to Figures 1 to 6 The utility model provides a kind of technical scheme: a grouting anti-drilling hole collapse drill bit, including drill bit body 1, drill bit body 1 bottom welding has drill cutter 2, drill bit body 1 top center welding has butt joint part 3, butt joint part 3 outside sleeve connects with flow limiting sleeve 4, butt joint part 3 top is connected with drill rod 5 by screw thread.
[0024] Butt joint part 3 top is penetrated with delivery propeller hole 301, the both sides of butt joint part 3 bottom outer wall are equipped with limiting block 302, and threaded groove 303 is inlaid in the top outer wall of butt joint part 3.
[0025] The center of flow limiting sleeve 4 is penetrated with through slot 401, and flow limiting disc 402 is welded to the bottom of flow limiting sleeve 4, first limiting groove 403 is inlaid in the both sides of the inner wall of through slot 401 bottom, second limiting groove 404 is arranged on the side of first limiting groove 403, first flow limiting hole 405 is penetrated in the top of flow limiting disc 402, and second flow limiting hole 406 is arranged on the side of first flow limiting hole 405.
[0026] In the embodiment, as Figure 2 And Figure 3As shown in the figure, the inside of the drill bit body 1 is penetrated by four U-shaped flow guide pipes 101, and the center of one end of the four U-shaped flow guide pipes 101 is the same as the center of the top of the drill bit body 1, and the top of one end of the four U-shaped flow guide pipes 101 communicates with the bottom of the delivery hole 301, and the other end of the four U-shaped flow guide pipes 101 penetrates the top of the drill bit body 1 respectively.
[0027] In this embodiment, as shown in Figure 1 , Figure 2 and Figure 3 , the drill bit 2 has a plurality of bottom flow lines, and the bottom of the drill bit 2 is arranged as a streamlined structure, and the drill bit 2 is annularly welded around the bottom of the drill bit body 1.
[0028] In this embodiment, as shown in Figure 1 , Figure 2 and Figure 3 , the inner wall of the bottom of the drill rod 5 is provided with an internal thread structure, and the bottom of the drill rod 5 and the threaded groove 303 at the top of the butt joint part 3 form a threaded connection structure, and the diameter of the drill rod 5 is the same as the diameter of the drill bit body 1.
[0029] In this embodiment, as shown in Figure 1 , Figure 2 and Figure 3 , the flow limiting sleeve 4 and the flow limiting disc 402 are integrally inverted T-shaped cross-section structure, and the outer wall of the butt joint part 3 and the inner wall of the through groove 401 are mutually fitted, and when the bottom of the flow limiting disc 402 is fitted with the outer wall of the top of the drill bit body 1, the top of the flow limiting sleeve 4 and the bottom outer wall of the drill rod 5 are mutually fitted.
[0030] In this embodiment, as shown in Figure 1 , Figure 2 and Figure 3 , the first flow limiting hole 405 has four, and the positions of the four first flow limiting holes 405 correspond to the other ends of the four flow guide pipes 101 respectively, and when the limiting block 302 is inserted into the first limiting groove 403, the bottom of the first flow limiting hole 405 and the top of the other end of the flow guide pipe 101 are mutually fitted.
[0031] In this embodiment, as shown in Figure 1 , Figure 2 and Figure 4 , the second flow limiting hole 406 has two, and the second flow limiting hole 406 is located between two adjacent first flow limiting holes 405, and when the limiting block 302 is inserted into the second limiting groove 404, the bottom of the second flow limiting hole 406 and the top of the other end of the two opposite flow guide pipes 101 are mutually fitted.
[0032] As shown in Figure 3 , Figure 4 , Figure 5 , Figure 3 , Figure 4 andFigure 6 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 As shown, the grouting anti-collapsing drill bit, in use, the working process is as follows:
[0033] First, the grouting drilling operation, the through slot 401 in the flow limiting sleeve 4 is sleeved on the butt joint part 3 at the top of the drill bit body 1, the first limiting groove 403 in the flow limiting sleeve 4 is inserted with the limiting block 302 at the bottom of the outer wall of the butt joint part 3 according to the requirement, and the four first flow limiting holes 405 outside the flow limiting disc 402 are aligned with one end of the four flow guide pipes 101;
[0034] Then the inner thread structure at the bottom of the drill rod 5 is threadedly connected with the threaded groove 303 at the top of the butt joint part 3, the bottom of the drill rod 5 is locked with the top of the flow limiting sleeve 4, and the installation of the grouting drill bit is completed. When the grouting drilling operation is carried out, the drill rod 5 rotates to drive the drill bit 2 at the bottom of the drill bit body 1 below to carry out the drilling operation. The drill rod 5 with the same diameter as the drill bit can effectively ensure the stability of the whole drilling and avoid the collapse of the drilling.
[0035] Then, when grouting is carried out, the slurry is poured into the flow guide pipe 101 in the drill bit body 1 through the grouting hole 301, and is discharged through the first flow limiting hole 405 for grouting. After grouting is completed, the grouting drill bit is taken out.
[0036] Finally, when it is necessary to control the grouting amount to avoid the collapse of the drilling when grouting, the second limiting groove 404 in the flow limiting sleeve 4 is inserted with the limiting block 302 when the flow limiting sleeve 4 is installed, so that the two second flow limiting holes 406 are aligned with the corresponding two of the four flow guide pipes 101. The grouting amount can be limited when grouting, thereby preventing the collapse of the drilling caused by excessive grouting at a time, and ensuring the normal operation of the subsequent shield construction operation.
[0037] The above shows and describes the basic principle, main features and advantages of the present application. The technical personnel in the industry should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and do not limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.
Claims
1. A grouting drill bit for preventing borehole collapse, comprising a drill bit body (1), characterized in that: The bottom of the drill bit body (1) is welded with a drill bit (2), the top center of the drill bit body (1) is welded with a docking part (3), the outside of the docking part (3) is fitted with a flow-limiting sleeve (4), and the top of the docking part (3) is threaded with a drill rod (5). The top of the docking part (3) is provided with a paddle feeding hole (301), and limit blocks (302) are installed on both sides of the bottom outer wall of the docking part (3). The top outer wall of the docking part (3) is inlaid with a threaded groove (303). The flow-limiting sleeve (4) has a through groove (401) in the center. A flow-limiting disk (402) is welded to the bottom of the flow-limiting sleeve (4). A first limiting groove (403) is embedded in both sides of the bottom inner wall of the through groove (401). A second limiting groove (404) is provided on one side of the first limiting groove (403). A first limiting hole (405) is passed through the top of the flow-limiting disk (402). A second limiting hole (406) is provided on one side of the first limiting hole (405).
2. The grouting drill bit for preventing borehole collapse according to claim 1, characterized in that: The drill bit body (1) has four U-shaped guide tubes (101) running through its interior. The center of one end of each of the four U-shaped guide tubes (101) is the same as the center of the top of the drill bit body (1). The top of one end of each of the four U-shaped guide tubes (101) is connected to the bottom of the feed hole (301). The other ends of the four U-shaped guide tubes (101) run through the top of the drill bit body (1) around its perimeter.
3. The grouting drill bit for preventing borehole collapse according to claim 1, characterized in that: There are multiple drill bits (2), and the bottom of the drill bit (2) is configured with a streamlined structure, and the drill bit (2) is circumferentially welded to the bottom of the drill bit body (1).
4. The grouting drill bit for preventing borehole collapse according to claim 1, characterized in that: The bottom inner wall of the drill rod (5) is provided with an internal thread structure, and the bottom of the drill rod (5) and the threaded groove (303) at the top of the docking part (3) form a threaded connection structure, and the diameter of the drill rod (5) is the same as the diameter of the drill bit body (1).
5. A grouting drill bit for preventing borehole collapse according to claim 4, characterized in that: The flow-limiting sleeve (4) and the flow-limiting disk (402) are in an inverted T-shaped cross-section structure. The outer wall of the docking part (3) is in contact with the inner wall of the through groove (401). When the bottom of the flow-limiting disk (402) is in contact with the top outer wall of the drill bit body (1), the top of the flow-limiting sleeve (4) is in contact with the bottom outer wall of the drill rod (5).
6. A grouting drill bit for preventing borehole collapse according to claim 2, characterized in that: There are four first flow limiting holes (405), and the positions of the four first flow limiting holes (405) correspond to the other ends of the four guide tubes (101). When the limiting block (302) is inserted into the first limiting groove (403), the bottom of the first flow limiting hole (405) is in contact with the top of the other end of the guide tube (101).
7. A grouting drill bit for preventing borehole collapse according to claim 2, characterized in that: There are two second flow limiting holes (406), and the second flow limiting hole (406) is located between two adjacent first flow limiting holes (405). When the limiting block (302) is inserted into the second limiting groove (404), the bottom of the second flow limiting hole (406) is in contact with the top of the other end of the two opposite guide pipes (101).