Anchoring device
By setting an annular step and a limiting step on the inner wall of the anchor bolt, the eccentric drill bit can be reused, which solves the high cost problem caused by the single use of self-propelled anchor bolt drill bits and reduces construction costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN HIGHWAY PLANNING SURVEY DESIGN AND RESEARCH INSTITUTE LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-26
AI Technical Summary
The drill bits for existing self-propelled anchor bolts are for single use, resulting in high construction costs.
Design an anchor bolt device including an anchor bolt, a drill rod, and an eccentric drill bit. By setting an annular step on the inner wall of the anchor bolt, the split drill bit of the eccentric drill bit passes through the annular step and is located outside the anchor bolt. The drill rod and the eccentric drill bit are reused by using the abutment and limiting of the limiting step and the annular step.
This effectively saves construction costs. By reversing the drill rod after drilling to remove the eccentric drill bit, the drill rod and eccentric drill bit can be reused, thus reducing construction costs.
Smart Images
Figure CN224413679U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of anchor bolt reinforcement technology, and in particular to an anchor bolt device. Background Technology
[0002] Self-drilling anchor bolts integrate drilling, grouting, and anchoring functions, representing an advanced anchoring system primarily used for excavation and support construction in fault fracture zones. They replace ordinary mortar anchor bolts in complex geological conditions, overcoming problems such as hole collapse, inability to insert bolts, and incomplete grouting. They solve the hole collapse problem during large pipe roof construction, ensuring effective grouting under complex geological conditions, maximizing the anchor bolt support function, improving the bearing capacity of the surrounding rock, and guaranteeing the overall stability of the surrounding rock. The required equipment and materials have no special requirements, the process is simple, and they have significant application value.
[0003] Existing self-drilling anchor bolts consist of a hollow rod body, a connecting sleeve, a drill bit, a washer plate, and a nut. In use, a drilling machine drives the hollow rod body, which in turn drives the drill bit forward through the rock strata until the designed depth is reached. Grouting is then performed through the hollow rod body. For example, Chinese utility model patent CN2045 11478U discloses a self-drilling anchor bolt structure including a drill bit, an anchor body, and a connecting sleeve. The drill bit is connected to the anchor body, and the drill bit is driven to drill by rotating the anchor body. However, since removing the anchor body and disassembling the drill bit after drilling is cumbersome, grouting is currently performed through the hollow rod body after drilling. This results in the drill bit being used only once, leading to higher construction costs. Utility Model Content
[0004] The purpose of this utility model is to provide an anchor bolt device that addresses the problem that the drill bits of current self-propelled anchor bolts are disposable, resulting in high construction costs.
[0005] This utility model provides an anchor bolt device, including an anchor bolt, a drill rod and an eccentric drill bit. The eccentric drill bit is located inside the anchor bolt, one end of the drill rod is connected to the eccentric drill bit, and the other end of the drill rod extends to the outside of the anchor bolt.
[0006] The inner wall of one end of the anchor rod is provided with an annular stepped portion;
[0007] The eccentric drill bit has a main rod, with multiple segmented drill bits hinged to the front end of the main rod, and a limiting step is provided on the outer wall of the rear end of the main rod;
[0008] The anchor rod and the eccentric drill bit are configured such that, when in the drilling state, the split drill bit passes through the annular step portion and is located outside the anchor rod, and the limiting step portion abuts against and limits the annular step portion.
[0009] By setting an annular step on the inner wall of the anchor rod, during drilling, the eccentric drill bit is first pushed by the drill rod, so that the split drill bit passes through the annular step and is located outside the anchor rod. At this time, the limiting step of the eccentric drill bit and the annular step abut against each other to form a matching limit. Then, the drill rod drives the eccentric drill bit to rotate and open. As the drill rod drives the eccentric drill bit to drill downward, during the operation, due to the limiting step and the annular step abutting and limiting, the eccentric drill bit pushes the annular step through the limiting step, thereby causing the eccentric drill bit to drive the anchor rod downward together. After drilling is completed, the eccentric drill bit is retracted by reversing the drill rod, and then the drill rod is pulled up to remove the eccentric drill bit from the anchor rod, thus realizing the reuse of the drill rod and the eccentric drill bit, effectively saving construction costs.
[0010] Preferably, the annular step portion has an internal channel, the internal channel is coaxially arranged with the annular step portion, and the internal channel passes through the annular step portion;
[0011] The inner wall of the internal channel is tapered.
[0012] Preferably, the anchor bolt includes a first segment and several intermediate segments, the inner wall of one end of the first segment is provided with the annular step portion, and the other end of the first segment is detachably connected to the intermediate segments;
[0013] The adjacent intermediate sections are detachably connected.
[0014] Preferably, the outer wall of the first segment away from the annular step portion is provided with a first external thread;
[0015] The inner wall of one end of the intermediate section has a first internal thread, and the outer wall of the other end of the intermediate section is also provided with the first external thread, and the first external thread and the first internal thread cooperate with each other.
[0016] Preferably, both the first segment and the middle segment are metal pipes.
[0017] Preferably, the system further includes multiple sets of grout leakage zones provided on the anchor bolt, the grout leakage zones being spaced apart along the length of the anchor bolt.
[0018] Preferably, each group of the grout leakage zones includes a plurality of grout leakage holes spaced apart around the anchor rod in a circumferential manner.
[0019] Preferably, the drill pipe comprises multiple assembled sections that are detachably connected.
[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0021] The anchor bolt device of this application, by setting an annular step on the inner wall of the anchor bolt, allows for drilling operations. First, the drill rod pushes the eccentric drill bit, causing the segmented drill bit to pass through the annular step and be positioned outside the anchor bolt. At this point, the limiting step of the eccentric drill bit abuts against the annular step, forming a locking mechanism. Then, the drill rod drives the eccentric drill bit to rotate and open. As the drill rod drives the eccentric drill bit downwards, during the drilling process, the limiting step and the annular step abut against each other, limiting the eccentric drill bit. This pushes the annular step through the limiting step, causing the eccentric drill bit to drive the anchor bolt downwards together. After drilling is completed, the drill rod is reversed to retract the eccentric drill bit, and then the drill rod is pulled up to remove the eccentric drill bit from the anchor bolt. This achieves the reuse of the drill rod and the eccentric drill bit, effectively saving construction costs. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of this application.
[0023] Figure 2 This is a schematic diagram of Ben Shen's eccentric drill bit drilling.
[0024] Figure 3 This is a cross-sectional view of anchor rod 1.
[0025] Figure 4 This is a schematic diagram of the anchor bolt segments.
[0026] Figure 5 This is a schematic diagram of drill pipe segments.
[0027] Figure 6 This is a schematic diagram of the anchor bolt device after grouting.
[0028] Marked in the image:
[0029] 1-Anchor bolt,
[0030] 11-Annular stepped section, 12-Grouting hole, 101-First section, 102-Middle section, 103-First internal thread, 104-First external thread
[0031] 2-Drill pipe,
[0032] 21-Assembly section, 210-Drill pipe boss, 211-Drill pipe groove.
[0033] 3-Eccentric drill bit,
[0034] 31-Main body rod, 32-Split drill bit, 33-Limiting step section, 35-Carbon tooth,
[0035] 4-Punch,
[0036] 5-Plate,
[0037] 6-Anchor block,
[0038] 100 - Internal passage. Detailed Implementation
[0039] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0040] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0041] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are set as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," "parallel," or "coaxial" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.
[0042] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.
[0043] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.
[0044] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.
[0045] Example 1
[0046] like Figures 1-2 As shown, the anchor bolt device described in this embodiment includes an anchor bolt 1, a drill rod 2 and an eccentric drill bit 3. The eccentric drill bit 3 is located inside the anchor bolt 1. One end of the drill rod 2 is connected to the eccentric drill bit 3, and the other end of the drill rod 2 extends to the outside of the anchor bolt 1.
[0047] An annular step 11 is provided on the inner wall of one end of the anchor rod 1;
[0048] The eccentric drill bit 3 has a main rod 31, with multiple segmented drill bits 32 hinged at the front end of the main rod 31, and a limiting step 33 provided on the outer wall of the tail end of the main rod 31.
[0049] The anchor bolt 1 and the eccentric drill bit 3 are configured such that when in the drilling state, the split drill bit 32 passes through the annular step portion 11 and is located outside the anchor bolt 1, and the limiting step portion 33 abuts against the annular step portion 11 for limiting.
[0050] The anchor bolt device described in this embodiment, by setting an annular step portion 11 on the inner wall of the anchor bolt 1, allows the eccentric drill bit 3 to be pushed by the drill rod 2 during drilling. This causes the split drill bit 32 to pass through the annular step portion 11 and be positioned outside the anchor bolt 1. At this time, the limiting step portion 33 of the eccentric drill bit 3 abuts against the annular step portion 11, forming a matching limit. Then, the drill rod 2 drives the eccentric drill bit 3 to rotate and open. As the drill rod 2 drives the eccentric drill bit 3 to drill downwards, the limiting step portion 33 abuts against the annular step portion 11, limiting the eccentric drill bit 3. The eccentric drill bit 3 pushes the annular step portion 11 through the limiting step portion 33, thereby causing the eccentric drill bit 3 to drive the anchor bolt 1 downwards together. After drilling is completed, the drill rod 2 is reversed to retract the eccentric drill bit 3, and then the drill rod 2 is pulled up to remove the eccentric drill bit 3 from the anchor bolt 1. This achieves the secondary use of the drill rod 2 and the eccentric drill bit 3, effectively saving construction costs.
[0051] In this application, as Figure 2 As shown, when the eccentric drill bit 3 rotates to drill, the several segmented drill bits 32 of the eccentric drill bit 3 are spread apart from each other. When the drilling is finished and the eccentric drill bit 3 needs to be removed, the drill rod 2 is reversed to make the several segmented drill bits 32 of the eccentric drill bit 3 come closer to each other and close together. Then the drill rod 2 and the eccentric drill bit 3 are removed from the inside of the anchor rod 1, leaving the anchor rod 1 in the drilled hole.
[0052] The central area of the annular stepped section 11 is the internal passage 100;
[0053] When drilling, such as Figure 2 As shown, the eccentric drill bit 3 is pushed through the internal channel 100 by the drill rod 2 and is located outside the anchor rod 1;
[0054] When it is necessary to remove the eccentric drill bit 3, the drill rod 2 is reversed so that the several segmented drill bits 32 of the eccentric drill bit 3 come closer to each other and are gathered together, so that the gathered eccentric drill bit 3 passes through the internal channel 100 of the annular step part 11 and then retracts into the anchor rod 1.
[0055] In this application, as Figure 2 As shown, the eccentric drill bit 3 includes a main body rod 31, the first end of the main body rod 31 is the drilling end, and multiple segmented drill bits 32 are hinged to the first end of the main body rod 31. The last end of the main body rod 31 is the end away from the segmented drill bits 32. A limiting step portion 33 is provided on the side wall of the last end of the main body rod 31. The limiting step portion 33 is an extension portion provided on the side wall of the last end of the main body rod 31 and protruding outward. The limiting step portion 33 is continuously arranged around the main body rod 31 in a circumferential direction.
[0056] Furthermore, a connecting rod is provided at the center of the tail end of the main rod 31. The connecting rod is used to connect with the drill rod 2. Specifically, it can be connected by welding, sleeve or bolt, such as welding one end of the drill rod 2 to the connecting rod.
[0057] In an optional embodiment, the annular step portion 11 has an internal channel 100, the internal channel 100 is coaxially arranged with the annular step portion 11, and the internal channel 100 passes through the annular step portion 11.
[0058] The inner wall of the internal channel 100 is a conical surface.
[0059] Specifically, along the length of the anchor rod 1, the internal channel 100 has a large diameter end near the end of the anchor rod 1 and a small diameter end away from the end of the anchor rod 1. The diameter of the small diameter end of the internal channel 100 is larger than the diameter of the eccentric drill bit 3 when it is closed.
[0060] Since the inner wall of the internal channel 100 is a conical surface and gradually decreases in size upwards along the length of the anchor rod, it is convenient for the eccentric drill bit 3 to gradually retract along the conical surface when it is removed.
[0061] Specifically, during the process of removing the eccentric drill bit 3, the eccentric drill bit 3 is first reversed to retract, and then lifted upward. During this process, the eccentric drill bit 3 gradually comes into contact with the inner wall of the annular step portion 11. Since the inner wall of the annular step portion 11 is a conical surface and gradually decreases in size along the length of the anchor rod, the eccentric drill bit 3 retracts a second time when it comes into contact with the conical surface, thus preventing the eccentric drill bit 3 from opening and preventing jamming between the eccentric drill bit 3 and the internal channel 100.
[0062] The diameter of the limiting step 33 is larger than the diameter of the small-diameter end of the internal channel 100, and the diameter of the limiting step 33 is smaller than the inner diameter of the anchor rod 1.
[0063] Furthermore, the split drill bit 32 has alloy teeth 35 on both the front and outer sides for cutting rocks and soil.
[0064] In this application, the drilling diameter of the eccentric drill bit 3 is equal to the outer diameter of the anchor rod 1. After the eccentric drill bit 3 drills the hole, the pipe wall of the anchor rod 1 is used to support the hole, effectively preventing the hole from collapsing. However, existing self-drilling anchor rods often require the installation of a sleeve inside the hole to support it after drilling, which is troublesome, time-consuming and laborious.
[0065] In an optional embodiment, the diameter of the anchor rod 1 is 108mm, and the drilling diameter of the eccentric drill bit 3 is 108mm, wherein the specification of the eccentric drill bit 3 is CIR90-108.
[0066] Specifically, the manufacturer of the eccentric drill bit 3 is Guanghan Kepurui Technology Co., Ltd., and its specific model is the 108 eccentric drill bit.
[0067] Furthermore, since the limiting step portion 33 of the eccentric drill bit 3 abuts against the annular step portion 11 of the anchor rod 1, during the drilling process, the eccentric drill bit 3 drives the anchor rod 1 to move downward together, while the anchor rod 1 continuously supports the hole.
[0068] In one or more implementations, such as Figure 4 As shown, the anchor bolt 1 includes a first section 101 and several intermediate sections 102. An annular step portion 11 is provided on the inner wall of one end of the first section 101, and the other end of the first section 101 is detachably connected to the intermediate sections 102.
[0069] Adjacent intermediate sections 102 are detachably connected.
[0070] In this embodiment, the anchor rod 1 consists of a first segment 101 and several intermediate segments 102. Adjacent intermediate segments 102 are detachably connected. During construction, the anchor rod 1 is continuously extended. The anchor rod 1 is drilled together with the eccentric drill bit 3. The anchor rod 1 is extended while drilling, so that the anchor rod 1 can reach the designed length. It is more suitable for construction on high and steep slopes and avoids the problem of difficulty in construction on high and steep slopes caused by the traditional use of a long anchor rod.
[0071] Specifically, the length of the first segment 101 and the middle segment 102 is 1.5m. During construction, the anchor rod 1 is extended by continuously connecting the middle segment 102.
[0072] In an optional embodiment, a first external thread 104 is provided on the outer wall of the end of the first segment 101 away from the annular step portion 11;
[0073] The inner wall of one end of the intermediate section 102 has a first internal thread 103, and the outer wall of the other end of the intermediate section 102 is also provided with a first external thread 104. The first external thread 104 and the first internal thread 103 cooperate with each other.
[0074] The diameter of the end of the middle section 102 with the first internal thread 103 is larger than the diameter of the end with the first external thread 104.
[0075] During the assembly of intermediate sections 102, one end of one intermediate section 102 with a first external thread 104 is threaded to the inner wall of the other intermediate section 102 with a first internal thread 103.
[0076] When the intermediate section 102 is assembled with the first section 101, the first section 101 is threaded to the inner wall of the intermediate section 102, which is provided with the first external thread 104.
[0077] In this implementation, the segments of anchor bolt 1 are connected by threaded connection, which is convenient and quick to extend. Compared with the traditional self-advancing anchor bolt which requires splicing through connecting sleeves, its construction is faster and more efficient.
[0078] In one or more embodiments, the first section 101 and the middle section 102 are both metal pipes.
[0079] Furthermore, the first section 101 and the middle section 102 are steel pipes.
[0080] In one or more embodiments, the method further includes multiple sets of grout leakage zones provided on the anchor rod 1, with the grout leakage zones spaced apart along the length of the anchor rod 1.
[0081] By using multiple grout leakage zones on anchor rod 1, after grout is injected into anchor rod 1, the grout flows through the grout leakage zones into the soil layer of the hole, thereby enhancing the stability of the hole.
[0082] In optional implementations, such as Figure 1 , Figure 3 As shown, each group of grout leakage zones includes multiple grout leakage holes 12 spaced around the anchor rod 1 in a circumferential manner.
[0083] The grout leakage holes 12 are spaced around the anchor rod 1 in a circumferential manner to ensure that the grout can penetrate evenly around the hole.
[0084] In an optional embodiment, the drill rod 2 includes multiple assembled sections 21 that are assembled together, and adjacent assembled sections 21 are detachably connected so that the drill rod 2 can be continuously extended during the drilling process.
[0085] Specifically, one end of the assembly section 21 is provided with a drill rod boss 210, and the other end of the assembly section 21 is provided with a drill rod groove 211. When assembling the drill rod 2, the drill rod boss 210 of one assembly section 21 is inserted into the drill rod groove 211 of another assembly section 21, thereby realizing the connection between the assembly sections 21. By continuously adding new assembly sections 21, the length of the drill rod 2 is increased.
[0086] This embodiment also discloses a construction method for an anchor bolt device, as detailed below:
[0087] First, install the annular step 11 on the inner wall of one end of the anchor rod 1, then connect the eccentric drill bit 3 to the drill rod 2, and then place the eccentric drill bit 3 and the drill rod 2 inside the anchor rod 1.
[0088] Connect drill rod 2 to the drilling machine, then push drill rod 2. Drill rod 2 pushes eccentric drill bit 3, so that the split drill bit 32 of eccentric drill bit 3 passes through the annular step part 11 and is located outside the anchor rod 1. The limiting step part 33 of anchor rod 1 and the annular step part 11 of eccentric drill bit 3 abut against each other to form a matching limiting.
[0089] The drilling rig is restarted, and the drilling rig drives the eccentric drill bit 3 to rotate and open through the drill rod 2 to drill a hole. The eccentric drill bit 3 pushes the annular step part 11 through the limiting step part 33, so that the eccentric drill bit 3 drives the anchor rod 1 to drill downward together. During drilling, the drilling is paused after drilling a certain distance, and then the anchor rod 1 and the drill rod 2 are extended. After the extension, the drilling construction continues.
[0090] After the drilling depth reaches the designed length, the eccentric drill bit 3 is retracted by reversing the drill rod 2, and then the eccentric drill bit 3 is removed from the anchor rod 1 by the drill rod 2. Then, grouting is performed inside the anchor rod 1.
[0091] After grouting, a retaining block 4 is constructed on the slope. One end of the anchor rod 1 passes through the retaining block 4, and a steel pad 5 is installed on the anchor rod 1. The steel pad 5 abuts against the retaining block 4. Then, a sealing block 6 is constructed on the retaining block 4, which wraps around the steel pad 5 and the anchor rod 1. Figure 6 .
[0092] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An anchor rod device, characterized in that, It includes an anchor bolt (1), a drill rod (2) and an eccentric drill bit (3), the eccentric drill bit (3) is located inside the anchor bolt (1), one end of the drill rod (2) is connected to the eccentric drill bit (3), and the other end of the drill rod (2) extends to the outside of the anchor bolt (1); The anchor rod (1) has an annular step (11) on the inner wall of one end; The eccentric drill bit (3) has a main body rod (31), the front end of which is hinged with a plurality of segmented drill bits (32), and the outer wall of the rear end of the main body rod (31) is provided with a limiting step (33); The anchor rod (1) and the eccentric drill bit (3) are configured such that when in the drilling state, the split drill bit (32) passes through the annular step portion (11) and is located outside the anchor rod (1), and the limiting step portion (33) abuts against the annular step portion (11) for limiting.
2. The anchor bolt device according to claim 1, characterized in that, The annular step portion (11) has an internal channel (100), the internal channel (100) is coaxially arranged with the annular step portion (11), and the internal channel (100) passes through the annular step portion (11); The inner wall of the internal channel (100) is tapered.
3. The anchor bolt device according to claim 1, characterized in that, The anchor rod (1) includes a first section (101) and several intermediate sections (102). The inner wall of one end of the first section (101) is provided with the annular step portion (11), and the other end of the first section (101) is detachably connected to the intermediate sections (102). The adjacent intermediate sections (102) are detachably connected.
4. The anchor bolt device according to claim 3, characterized in that, The outer wall of the first segment (101) away from the annular step portion (11) is provided with a first external thread (104); The inner wall of one end of the intermediate section (102) has a first internal thread (103), and the outer wall of the other end of the intermediate section (102) is also provided with the first external thread (104). The first external thread (104) and the first internal thread (103) cooperate with each other.
5. An anchor bolt device according to claim 4, characterized in that, Both the first section (101) and the middle section (102) are metal pipe fittings.
6. The anchor bolt device according to claim 1, characterized in that, It also includes multiple sets of grout leakage zones provided on the anchor rod (1), the grout leakage zones being arranged at intervals along the length direction of the anchor rod (1).
7. An anchor bolt device according to claim 6, characterized in that, Each group of the grout leakage zones includes multiple grout leakage holes (12) spaced circumferentially around the anchor rod (1).
8. An anchor bolt device according to claim 1, characterized in that, The drill pipe (2) includes multiple assembled sections (21) that are assembled together, and adjacent assembled sections (21) are detachably connected.