Self-drilling type segmented anchor rod

Abstract

The utility model discloses a self-drilling type segmented anchor rod, and relates to the technical field of geotechnical engineering anchoring support. Both ends of a connecting sleeve are provided with mounting ports which are in threaded connection with a hollow screw rod, and the inner bottom surfaces of the two mounting ports at both ends of the connecting sleeve are provided with through ports which are communicated with the two mounting ports; the hollow screws are connected in series through the connecting sleeves to form the hollow anchor rod, the drill bit is installed at one end of the hollow anchor rod, the base plate and the nut are installed at the other end of the hollow anchor rod, elastic limiting pieces used for limiting and blocking the nut are arranged at the two ends of the nut, and sealing pieces used for sealing the end of an installation opening are arranged at the two ends of the connecting sleeves. The pre-assembled nut can be limited, clamped and blocked, the nut is prevented from moving and falling off in the transportation process, the nut and the end of the connecting sleeve can be sealed, muddy water impurities are prevented from permeating into a gap between a mounting opening and the diameter of the anchor rod, and the connecting position of the connecting sleeve and the anchor rod is prevented from being rusted, corroded and damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering anchoring and supporting, in particular to a self-drilling segmented anchor rod. Background Art

[0002] Self-drilling segmented anchor is a commonly used consolidation material in engineering construction. It is a fully threaded rod that can be drilled and grouted in soft surrounding rocks such as broken rock layers and loose soil layers without casing and drill rod. It can integrate the functions of drilling, grouting and anchoring, and has the characteristics of convenient construction, reliability and high efficiency. The surface of the rod is processed to form an international standard thread, which can be reliably connected with standard rock drilling tools such as drilling rigs, anchor trolleys, grouting machines, etc. However, the existing self-drilling segmented anchor still has the following shortcomings during use:

[0003] 1. The traditional self-drilling segmented anchor bolt is generally drilled after the anchor bolt is installed with a drill bit, and then the center hole is grouted after drilling into place, and finally the pad and nut are installed in sequence. Since the nuts and anchor bolts are stored separately, the number of nuts may not match the number of rods. For this reason, nuts are often pre-installed on existing hollow anchor bolts. However, during transportation, the nuts are very likely to move and slip, affecting construction efficiency;

[0004] 2. During the construction of self-drilling segmented anchors, especially segmented anchors, muddy slurry and other impurities can easily penetrate into the gap between the nut and the anchor, as well as the connecting sleeve used to connect multiple segments of anchors. With the infiltration of muddy water and impurities, it is very easy to cause rust damage inside the nut and the connecting sleeve;

[0005] 3. During the grouting process of segmented self-drilling anchor bolts, since the multiple segments of anchor bolts are only connected by simple threads, the joints lack a sealing structure, which makes it very easy for the anchor bolt joints to leak. If leakage occurs during grouting, resulting in grouting pressure loss, the cement slurry will not be able to fill the rock cracks well, affecting the quality of the project.

[0006] Therefore, there is an urgent need for a self-drilling segmented anchor rod that can overcome the above-mentioned disadvantages. Utility Model Content

[0007] In order to overcome the shortcomings of the background technology, the utility model discloses a self-drilling segmented anchor rod, which can not only limit the pre-installed nuts to prevent the nuts from moving and falling off during transportation, but also seal the ends of the nuts and connecting sleeves, thereby providing a strong guarantee for the subsequent smooth disassembly and installation of the nuts and connecting sleeves.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A self-drilling segmented anchor rod comprises a hollow screw rod, a nut, a pad, a connecting sleeve and a drill bit. Both ends of the connecting sleeve are provided with mounting openings threadedly connected to the hollow screw rod. The inner bottom surfaces of the two mounting openings at both ends of the connecting sleeve are provided with through openings connecting the two mounting openings. Several hollow screw rods are connected in series through several connecting sleeves to form a hollow anchor rod. The drill bit is installed at one end of the hollow anchor rod, and the pad and the nut are installed at the other end of the hollow anchor rod. Both ends of the nut are provided with elastic limiters for limiting and blocking the nut, and both ends of the connecting sleeve are provided with sealing members for sealing the ends of the mounting openings.

[0010] Furthermore, the elastic limiter includes a mounting ring and a rubber ring A. Both ends of the nut are provided with mounting rings coaxially arranged with the nut and with an inner diameter larger than the nut hole diameter. The inner wall of the mounting ring is provided with a rubber ring A arranged around the hollow screw and having an interference fit with the hollow screw.

[0011] Furthermore, the sealing member includes an outer sleeve ring and a rubber ring B. Both ends of the connecting sleeve are detachably provided with an outer sleeve ring coaxially arranged with the connecting sleeve and having an inner diameter larger than the outer diameter of the connecting sleeve. The inner wall of the outer sleeve ring is provided with a rubber ring B arranged around the hollow screw and having an interference fit with the hollow screw.

[0012] Furthermore, an annular groove is arranged around the outer wall of the connecting sleeve on both ends of the outer wall of the connecting sleeve, a reducing ring matching the annular groove is arranged on one end of the inner wall of the outer ring, and a rubber ring B is arranged on the other end of the inner wall of the outer ring.

[0013] Furthermore, the inner diameter of the through opening is matched with the inner diameter of the hollow screw.

[0014] Furthermore, both ends of the through-port are provided with convex rings coaxially arranged with the through-port, the inner diameter of the convex ring is larger than the diameter of the through-port and the outer diameter is smaller than the outer diameter of the hollow screw, and both ends of the hollow screw are provided with annular sealing grooves matched with the convex rings.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] By setting the elastic limiter, not only can the pre-installed limit block of the nut be realized to prevent the nut from slipping and falling during the transportation of the anchor rod, but also the two ends of the nut can be sealed to prevent muddy water and impurities from penetrating into the gap between the nut and anchor rod to affect the adjustment and disassembly of the nut;

[0017] By setting the seal, the two ends of the connecting sleeve can be effectively sealed to prevent muddy water and impurities from penetrating into the gap between the installation port and the anchor rod diameter, and avoid rust and corrosion damage at the connection between the connecting sleeve and the anchor rod;

[0018] The plug-in cooperation between the convex ring and the annular sealing groove can improve the sealing performance of the connection between the hollow screw and the connecting sleeve, avoid leakage of muddy water from the connection during the grouting process, and provide a strong guarantee for the smooth and efficient injection of muddy water in the subsequent process.

[0019] The utility model discloses can not only limit the pre-installed nut and prevent the nut from moving and falling off during transportation, but also does not affect the subsequent rotation adjustment of the nut, but also can seal the nut and the end of the connecting sleeve, effectively preventing muddy water and impurities from seeping in and causing rust and corrosion damage to the nut and the connecting sleeve; the utility model has a simple structure and is easy to install and use, provides a strong guarantee for the high-efficiency construction of the anchor rod, and saves construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the nut structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the connection state between the nut and the hollow screw of the utility model;

[0023] Figure 4 This is a schematic diagram of the connecting sleeve structure of the utility model;

[0024] Figure 5 This is a schematic diagram of the seal structure of the utility model;

[0025] Figure 6 This is a schematic diagram of the hollow screw structure of the utility model;

[0026] Figure 7 It is a schematic diagram of the connection state of the connecting sleeve and the hollow screw of the utility model.

[0027] In the figure: 1. hollow screw; 2. nut; 3. elastic limiter; 4. gasket; 5. seal; 6. connecting sleeve; 7. drill bit; 8. mounting ring; 9. rubber ring A; 10. annular groove; 11. convex ring; 12. mounting port; 13. through port; 14. outer ring; 15. rubber ring B; 16. reducing ring; 17. annular sealing groove. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present invention and are for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction.

[0029] Please refer to the instruction manual Figure 1-7 , the utility model provides a technical solution:

[0030] Embodiment 1, a self-drilling segmented anchor, comprising a hollow screw 1, a nut 2, a pad 4, a connecting sleeve 6 and a drill bit 7, both ends of the connecting sleeve 6 are provided with mounting openings 12 threadedly connected to the hollow screw 1, the inner bottom surfaces of the two mounting openings 12 at both ends of the connecting sleeve 6 are provided with through openings 13 connecting the two mounting openings 12, several hollow screws 1 are connected in series through several connecting sleeves 6 to form a hollow anchor, the drill bit 7 is installed at one end of the hollow anchor, and the pad 4 and the nut 2 are installed at the other end of the hollow anchor;

[0031] In order to avoid the mismatch or loss of the number of nuts 2 and anchor rods during subsequent drilling, the nuts 2 are directly pre-installed on the upper part of the hollow anchor rod. In order to prevent the nut from moving and slipping when transporting the anchor rod, elastic limiters 3 for limiting and blocking the nut 2 are provided at both ends of the nut 2. Specifically, the elastic limiter 3 includes a mounting ring 8 and a rubber ring A9. Both ends of the nut 2 are provided with a mounting ring 8 coaxially arranged with the nut 2 and with an inner diameter larger than the aperture of the nut 2. The inner wall of the mounting ring 8 is provided with a rubber ring A9 arranged around the hollow screw 1 and having an interference fit with the hollow screw 1. The elastic limiter 3 can be used to limit and block the nut 2 and move it during the subsequent rotation and adjustment process of the nut 2, and can also prevent muddy water impurities from penetrating into the gap between the nut 2 and the anchor rod.

[0032] In order to prevent muddy water and impurities from penetrating into the installation port 12, sealing members 5 for sealing the ends of the installation port 12 are provided at both ends of the connecting sleeve 6. Specifically, the sealing member 5 includes an outer ring 14 and a rubber ring B15. An annular groove 10 arranged around the outer wall of the connecting sleeve 6 is provided on the outer walls at both ends of the connecting sleeve 6. The outer ring 14 is coaxially arranged with the connecting sleeve 5, and the inner diameter is larger than the outer diameter of the connecting sleeve 6. A reducing ring 16 matched with the annular groove 10 is provided at one end of the inner wall of the outer ring 14, and a rubber ring B15 arranged around the hollow screw 1 and having an interference fit with the hollow screw 1 is provided at the other end of the inner wall of the outer ring 14.

[0033] Embodiment 2: During the grouting process, if leakage occurs, it will cause grouting pressure loss, resulting in the inability of mud and water slurry to effectively fill the cracks in the rock mass, affecting the quality of the project. In order to improve the sealing performance of the hollow anchor during grouting, the inner diameter of the through port 13 is adapted to the inner diameter of the hollow screw 1, and both ends of the through port 13 are provided with a convex ring 11 coaxially arranged with the through port 13. The inner diameter of the convex ring 11 is larger than the diameter of the through port 13, and the outer diameter is smaller than the outer diameter of the hollow screw 1. Both ends of the hollow screw 1 are provided with annular sealing grooves 17 adapted to the convex ring 11.

[0034] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A self-drilling segmented anchor rod, comprising a hollow screw rod (1), a nut (2), a pad (4), a connecting sleeve (6) and a drill bit (7), both ends of the connecting sleeve (6) are provided with mounting openings (12) threadedly connected to the hollow screw rod (1), the inner bottom surfaces of the two mounting openings (12) at both ends of the connecting sleeve (6) are provided with through openings (13) communicating with the two mounting openings (12), a plurality of hollow screw rods (1) are connected in series through a plurality of connecting sleeves (6) to form a hollow anchor rod, the drill bit (7) is installed at one end of the hollow anchor rod, the pad (4) and the nut (2) are installed at the other end of the hollow anchor rod, and the characteristics are as follows: Elastic stoppers (3) for stopping the nut (2) are provided at both ends of the nut (2), and sealing members (5) for sealing the end of the installation opening (12) are provided at both ends of the connecting sleeve (6).

2. A self-drilling segmented anchor according to claim 1, characterized in that: The elastic limiter (3) comprises a mounting ring (8) and a rubber ring A (9). Both ends of the nut (2) are provided with mounting rings (8) which are coaxially arranged with the nut (2) and have an inner diameter larger than the hole diameter of the nut (2). The inner wall of the mounting ring (8) is provided with a rubber ring A (9) which is arranged around the hollow screw (1) and has an interference fit with the hollow screw (1).

3. A self-drilling segmented anchor according to claim 1, characterized in that: The sealing member (5) comprises an outer sleeve ring (14) and a rubber ring B (15). The outer sleeve ring (14) is detachably mounted on both ends of the connecting sleeve (6) and is coaxially arranged with the connecting sleeve (6) and has an inner diameter greater than the outer diameter of the connecting sleeve (6). The inner wall of the outer sleeve ring (14) is provided with a rubber ring B (15) which is arranged around the hollow screw (1) and is in interference fit with the hollow screw (1).

4. A self-drilling segmented anchor according to claim 3, characterized in that: An annular groove (10) is provided on the outer walls of both ends of the connecting sleeve (6) and surrounds the outer wall of the connecting sleeve (6). A reducing ring (16) matching the annular groove (10) is provided at one end of the inner wall of the outer sleeve ring (14). A rubber ring B (15) is provided at the other end of the inner wall of the outer sleeve ring (14).

5. The self-drilling segmented anchor rod according to claim 1, characterized in that: The inner diameter of the through opening (13) matches the inner diameter of the hollow screw (1).

6. A self-drilling segmented anchor according to claim 5, characterized in that: Both ends of the through opening (13) are provided with convex rings (11) coaxially arranged with the through opening (13); the inner diameter of the convex ring (11) is larger than the diameter of the through opening (13) and the outer diameter is smaller than the outer diameter of the hollow screw (1); and both ends of the hollow screw (1) are provided with annular sealing grooves (17) matched with the convex ring (11).

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