Tunnel excavation support plate anchoring device

Abstract

The utility model discloses an anchoring device for a tunnel excavation supporting plate. The anchoring device comprises an anchor rod, a sealing plug and a supporting component. The head end of the anchor rod is sleeved with the sealing plug, and the supporting component comprises an upper ring body, a lower ring body, an arc-shaped supporting rod, a positioning pipe and a fastener. The upper ring body and the lower ring body sleeve the tail part of the vertically arranged anchor rod at an interval, and the upper end and the lower end of the arc-shaped supporting rod are fixedly connected with the outer walls of the upper ring body and the lower ring body respectively. At least three symmetrically-distributed positioning pipes are vertically fixed to the inner side wall of the ring body in the circumferential direction of the ring body, and gaps are formed between the ends of the positioning pipes and the outer wall of the anchor rod. The positioning pipe on the lower ring body is communicated with the screw hole in the side wall of the ring body, and the fastener is in threaded connection in the screw hole and abuts against the outer side wall of the anchor rod after penetrating through the positioning pipe. According to the anchoring device, not only is the concentricity between the anchor rod and the drill hole improved, but also secondary anchoring can be formed between the anchor rod and the drill hole, and the anchoring effect is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel support, in particular to a tunnel excavation support plate anchoring device. Background Art

[0002] During the tunnel excavation process, as the tunnel cross-section continues to expand, the surrounding rock and soil are prone to collapse due to self-weight instability. Therefore, it is usually necessary to use support plates for support and reinforcement to improve the bearing capacity of the surrounding rock and reduce tunnel collapse. Anchor support is a commonly used surrounding rock reinforcement method. It mainly achieves the purpose of support and reinforcement by driving anchor rods into the surrounding rock of the tunnel excavation working face, thereby fixing the support plates on the tunnel surrounding rock. When installing and fixing the anchor rods, it is necessary to first drill a hole in the side wall of the surrounding rock and then implant the anchor rod. Then, an anchoring agent is injected into the drill hole. After the anchoring agent solidifies and hardens, the anchor rod and the surrounding rock can be fixed together to form a whole. However, in actual construction, after the anchor rod is inserted into the borehole, the anchor rod is often tilted. Especially for the borehole that is obliquely opened on the side wall of the surrounding rock, it is difficult to ensure that the anchor rod and the borehole are in a good concentricity state under the action of the anchor rod's own gravity, which leads to uneven distribution of the anchoring agent filled between the anchor rod and the borehole, reducing the anchoring effect between the anchor rod and the surrounding rock, and posing a hidden danger to the reinforcement of the tunnel surrounding rock. Utility Model Content

[0003] The present invention provides a tunnel excavation support plate anchoring device that not only improves the concentricity between the anchor rod and the drill hole, but also forms a secondary anchor between the anchor rod and the drill hole, thereby improving the anchoring effect. Specifically, the technical solution of the present invention is as follows.

[0004] A tunnel excavation support plate anchoring device comprises: an anchor rod, a sealing plug and a supporting component. The sealing plug is sleeved on the head end of the anchor rod, and the supporting component comprises an upper ring body, a lower ring body, an arc-shaped support rod, a positioning tube and a fastener. The upper ring body and the lower ring body are sleeved on the tail of the vertically arranged anchor rod, and the upper and lower ends of the arc-shaped support rod are fixedly connected to the outer walls of the upper ring body and the lower ring body respectively, and at least two arc-shaped support rods are evenly distributed along the circumference of the ring body. At least three symmetrically distributed positioning tubes are vertically fixed on the inner wall of the ring body along the circumference, and there is a gap between the end of the positioning tube and the outer wall of the anchor rod. The positioning tube on the lower ring body is connected to the screw hole on the side wall of the ring body, and the fastener is threadedly connected to the screw hole and is pressed against the outer wall of the anchor rod after passing through the positioning tube.

[0005] Furthermore, the supporting component also includes an elastic limiting plate and an elastic sheet. The lower end of the elastic limiting plate arranged to be inclined outward is fixedly or movably connected to the lower ring body, and the upper end is connected to the upper end of the elastic sheet arranged to be inclined. The lower end of the elastic sheet is fixed on the upper ring body, and at least two elastic limiting plates are evenly distributed along the circumference of the lower ring body, and the upper end of the elastic limiting plate is located on the outside of the arc-shaped support rod.

[0006] Furthermore, the anchor rod is formed by two rod bodies threadedly connected, and the connection between the two is located between the upper ring body and the lower ring body. The upper end of the arc-shaped support rod and the upper ring body are movably connected, so that the guide tube can move up and down relative to the arc-shaped support rod.

[0007] Furthermore, the upper end of the arc-shaped support rod is an "L"-shaped structure, and the vertical rod portion thereof is movably inserted into a guide tube fixed on the outer side wall of the upper ring body.

[0008] Furthermore, the elastic sheet is an arc-shaped sheet structure and is in a concave state.

[0009] Furthermore, the anchor rod is a hollow tube with a slurry outlet hole on the side wall of the tail end so as to inject the anchoring agent into the drill hole.

[0010] Furthermore, the outer end surface of the sealing plug is provided with an exhaust hole connected to a drilled hole for installing the anchor rod.

[0011] Furthermore, the width of the gap between the end of the positioning tube and the outer wall of the anchor rod is 0.4-1 mm.

[0012] Furthermore, it also includes a fastening nut and an arched pad. The fastening nut, the arched pad and the sealing plug are movably sleeved on the head end of the anchor rod in sequence, and the fastening nut and the anchor rod are threadedly connected.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] The anchoring device of the present invention is provided with a support component at the tail of the anchor rod, which not only supports the anchor rod through the arc-shaped support rod, but also prevents the problem of difficulty in maintaining good concentricity after the anchor rod is inserted into the borehole in the tunnel surrounding rock, and makes the distribution of the anchoring agent filled between the anchor rod and the borehole more uniform, thereby improving the anchoring effect between the anchor rod and the surrounding rock. At the same time, by providing a positioning tube on the inner side wall of the lower ring body, the lower ring body can be fastened to the anchor rod by passing the fastener through the lower ring body and the positioning tube, and a gap is formed between the lower ring body and the anchor rod, which facilitates the passage of the injected anchoring agent and fully fills the borehole. In addition, the retractable structure formed by the elastic limiting plate and the elastic sheet can form a secondary anchoring between the anchor rod and the borehole, further improving the anchoring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0016] Figure 1 Schematic diagram of the structure of the tunnel excavation support plate anchoring device in the following embodiments.

[0017] Figure 2 2 is a front view of the supporting component in the following embodiments.

[0018] Figure 3 1 is a side view of the support component in the following embodiment.

[0019] Figure 4 1 is a top view of the supporting component in the following embodiments.

[0020] Figure 5 This is a front view of another supporting component in the following embodiments.

[0021] Figure 6 It is a side view of another supporting component in the following embodiment.

[0022] The symbols in the accompanying drawings represent: 1-anchor rod, 2-sealing plug, 3-drill hole, 4-upper ring body, 5-lower ring body, 6-arc support rod, 7-positioning tube, 8-fastener, 9-elastic limit plate, 10-elastic sheet, 11-screw hole, 12-guide tube, 13-arch pad, 14-fastening nut, 101-upper rod body, 102-lower rod body, 103-slurry outlet hole. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0024] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to needs to have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0025] refer to Figure 1The present invention illustrates a tunnel excavation support plate anchoring device comprising an anchor rod 1, a sealing plug 2, and a support component. The sealing plug 2, which can be made of rubber and is sleeved onto the head end of the anchor rod 1, prevents leakage of the anchoring agent injected into the tunnel surrounding rock borehole 3 and cooperates with the support component to position the anchor rod 1 as centrally as possible within the borehole 3, thereby ensuring concentricity between the two. The sealing plug 2 is conical in shape, with one end having a diameter greater than that of the borehole 3.

[0026] refer to Figure 2 、 Figure 3 and Figure 4 The support component includes an upper ring body 4, a lower ring body 5, an arcuate support rod 6, a positioning tube 7, and a fastener 8. The upper ring body 4 and the lower ring body 5 are both annular structures, both of which are sleeved on the side wall of the tail portion of the vertically arranged anchor rod 1, and the upper ring body 4 and the lower ring body 5 are spaced apart. The upper and lower ends of the arcuate support rod 6 are respectively fixedly connected to the outer walls of the upper ring body 4 and the lower ring body 5, and at least two arcuate support rods 6 are evenly distributed along the circumference of the ring body. For example, in this embodiment, the arcuate support rods 6 are symmetrically arranged as two, but can also be three, four, etc.

[0027] The positioning tubes 7 are vertically fixed to the inner sidewalls of the upper ring body 4 and the lower ring body 5, and at least three positioning tubes 7 are evenly distributed along the circumference of the ring body. These positioning tubes 7 are distributed around the circumference of the anchor rod 1, and a gap is formed between the end of the positioning tube 7 and the outer wall of the anchor rod 1. Optionally, the width of the gap is 0.4-1 mm, such as 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, etc., so that the upper ring body 4 and the lower ring body 5 can be inserted into the anchor rod 1 while maintaining good concentricity between the anchor rod 1 and the ring body.

[0028] The side wall of the lower ring body 5 is provided with a screw hole 11 that penetrates through it. The positioning tube 7 on the lower ring body 5 is fixedly docked with the screw hole 11 and the two are connected. One end of the fastener 8 is threadedly connected to the screw hole 11 and passes through the positioning tube 7 and is tightened against the outer wall of the anchor rod 1. The fastener 8 can be a bolt or the like, thereby fastening the lower ring body 5 and the anchor rod 1 together, and the upper ring body 4 and the anchor rod 1 are kept in a state of active connection. The positioning tube 7 can not only fix the lower ring body 5 and the anchor rod 1, but also form a gap between the upper ring body 4 and the anchor rod 1 and between the lower ring body 5 and the anchor rod 1, so that the anchoring agent injected into the borehole 3 can fill the borehole after passing through, thereby ensuring the anchoring effect between the anchor rod 1 and the tunnel surrounding rock.

[0029] In another embodiment, reference Figures 3-5The supporting component of the above embodiment also includes an elastic limiting plate 9 and an elastic sheet 10. Among them: the elastic limiting plate 9 is in a state where the upper end is tilted outward, and the lower end is fixedly or movably connected to the outer wall of the lower ring body 5. The elastic sheet 10 is also in a state where the upper end is tilted outward, and its upper end is connected to the upper end of the elastic limiting plate 9, and the lower end of the elastic sheet 10 is fixedly connected to the outer wall of the upper ring body 4, and the upper end of the elastic limiting plate 9 is located on the outside of the arc-shaped support rod 6, that is, the upper end of the elastic limiting plate 9 expands outward larger than the arc-shaped support rod 6, so that after the anchor rod 1 is inserted into the borehole 3, the wall of the borehole squeezes the upper end of the elastic limiting plate 9, so that the upper end of the elastic limiting plate 9 abuts against the wall of the hole to form a secondary anchor, and the arc-shaped support rod 6 can slide into the borehole along the wall of the borehole. At least two groups of retractable secondary anchoring assemblies formed by elastic limiting plates 9 and elastic sheets 10 are symmetrically distributed along the circumference of the lower ring body 5. The elastic limiting plates 9 and elastic sheets 10 can be made of metal sheets with good elasticity such as steel sheets, and their thickness can be between 0.2 and 0.5 mm. Elastic limiting plates 9 and elastic sheets 10 of other thicknesses can also be used as needed.

[0030] Reference when using Figure 1 First, a borehole 3 is opened in the tunnel surrounding rock. Then, after the borehole is cleaned, the anchoring device of this embodiment is inserted into the borehole 3, and the head end of the anchor rod 1 is located outside the borehole 3. The sealing plug 2 blocks the port of the borehole 3 to support the anchor rod 1. The sealing plug 2 and the supporting component at the other end of the anchor rod 1 jointly support the anchor rod 1 to prevent it from tilting too much in the borehole 3 and failing to maintain good concentricity with the borehole 3. During the process of inserting the anchor rod 1 into the borehole 3, the outward-tilted ends of the elastic limiting plate 9 and the elastic sheet 10 are squeezed against the wall of the borehole 3 and tightened against the wall. At the same time, under the restriction of the arc-shaped support rod 6, the anchor rod 1 is prevented from tilting too much under the action of its own weight, so that the anchor rod 1 maintains good concentricity with the borehole 3. At the same time, the arc-shaped support rod 6 also helps to prevent the elastic limiting plate 9 and the elastic sheet 10 from being squeezed by the weight of the anchor rod 1 itself, which in turn leads to a large difference in the degree of expansion and contraction of the secondary anchoring components on the upper and lower sides of the anchor rod 1, resulting in a problem of reduced concentricity between the anchor rod 1 and the borehole 3, thereby making the anchoring agent filled in the borehole 3 more evenly distributed and improving the anchoring effect. At the same time, since one end of the elastic limiting plate 9 and the elastic sheet 10 is squeezed tightly against the hole wall, it increases the difficulty of the anchor rod 1 to detach from the borehole 3, thereby forming a secondary anchor between the anchor rod 1 and the borehole 13. In addition, after the anchoring agent solidifies, the support component fixed to the anchor rod 1 is anchored therein to form a whole with the anchoring agent, which also increases the difficulty of the anchor rod 1 to detach from the borehole 3 and improves the anchoring effect.

[0031] In another embodiment, reference Figure 3The elastic sheet 10 of the above embodiment is a concave arc-shaped sheet structure. Such an elastic sheet 10 is conducive to better contraction of the end of the elastic limiting plate 9 when squeezed by the borehole wall, thereby more smoothly inserting the anchor rod 1 into the borehole 3.

[0032] In another embodiment, reference Figure 5 and Figure 6 The anchor rod 1 of the above embodiment is composed of an upper rod body 101 and a lower rod body 102. The lower end of the upper rod body 101 has an internal threaded pipe mouth, and the outer side wall of the upper end of the lower rod body 102 has an external thread, which is threadedly connected to the internal threaded pipe mouth, and the connection between the two is located between the upper ring body 4 and the lower ring body 5. That is, the upper ring body 4 and the lower ring body 5 are respectively located on the upper rod body 101 and the lower rod body 102, wherein the lower ring body 5 is fastened to the side wall of the lower rod body 102 by a fastener 8, and the upper ring body 4 is supported on the upper rod body 101 by an elastic limit plate 9 and an elastic sheet 10. The upper end of the arc-shaped support rod 6 is an "L"-shaped structure, and its vertical rod part is movably inserted into the guide tube 12, which is fixed on the outer side wall of the upper ring body 4, so that the upper ring body 4 and the guide tube 12 can move up and down relative to the arc-shaped support rod 6. During use, one end of the upper rod body 101 is located outside the borehole 3 , and the lower rod body 102 is completely located in the borehole 3 .

[0033] In another embodiment, reference Figure 1 The anchor rod 1 of the above embodiment is a hollow tube with a slurry outlet 103 on the side wall of the tail end, so that the anchoring agent can be injected from the outer port of the anchor rod 1. The anchoring agent enters the borehole 3 from the slurry outlet 103. After the anchoring agent is completely solidified and hardened to fix the anchor rod 1 in the borehole 3, the arched pad 13 and the fastening nut 14 can be sequentially put on the outer end of the anchor rod 1, and the fastening nut 14 is threadedly connected to the anchor rod 1. After the anchor rod 1 is tensioned to reach the set prestress, the fastening nut 14 is tightened, and then the arched pad 13 is fastened to the tunnel surrounding rock wall to keep the anchor rod 1 in a prestressed state.

[0034] In another embodiment, the outer end surface of the sealing plug 2 of the above embodiment further includes an exhaust hole connected to the borehole 3 to exhaust air in the borehole 3 during anchor injection, allowing the anchor to be better filled into the borehole 3 and providing a better anchoring effect. After the anchor is injected, the exhaust hole can be sealed to help prevent leakage of the anchor.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tunnel excavation support plate anchoring device, characterized in that: include: Anchor rod, sealing plug and supporting component; wherein: the sealing plug is sleeved on the head end of the anchor rod, and the supporting component includes: An upper ring body and a lower ring body, wherein the upper ring body and the lower ring body are spaced apart and sleeved on the tail of the vertically arranged anchor rod; An arc-shaped support rod, wherein the upper and lower ends of the arc-shaped support rod are fixedly connected to the outer walls of the upper ring body and the lower ring body respectively, and at least two arc-shaped support rods are evenly distributed along the circumference of the ring body; Positioning tubes: at least three symmetrically distributed positioning tubes are vertically fixed on the inner side wall of the ring body along the circumference thereof, and a gap is formed between the end of the positioning tube and the outer wall of the anchor rod; the positioning tubes on the lower ring body are connected to the screw holes on the side wall of the ring body; A fastener is threadedly connected in the screw hole and passes through the positioning tube to be tightened against the outer side wall of the anchor rod.

2. The tunnel excavation support plate anchoring device according to claim 1, characterized in that: The supporting component also includes an elastic limiting plate and an elastic sheet; wherein: the lower end of the elastic limiting plate arranged to be inclined outward is fixedly or movably connected to the lower ring body, and the upper end is connected to the upper end of the elastic sheet arranged to be inclined; the lower end of the elastic sheet is fixed on the upper ring body, and at least two elastic limiting plates are evenly distributed along the circumference of the lower ring body, and the upper end of the elastic limiting plate is located on the outside of the arc-shaped support rod.

3. The tunnel excavation support plate anchoring device according to claim 2, characterized in that: The anchor rod is formed by two rod bodies connected by threads, and the connection between the two is located between the upper ring body and the lower ring body. The upper end of the arc-shaped support rod is movably connected to the upper ring body, so that the guide tube can move up and down relative to the arc-shaped support rod.

4. The tunnel excavation support plate anchoring device according to claim 3, characterized in that: The upper end of the arc-shaped support rod is an "L"-shaped structure, and its vertical rod part is movably inserted into the guide tube fixed on the outer side wall of the upper ring body.

5. The tunnel excavation support plate anchoring device according to claim 2, characterized in that: The elastic sheet is an arc-shaped sheet structure and is in a concave state.

6. The tunnel excavation support plate anchoring device according to claim 1, characterized in that: The anchor rod is a hollow tube with a slurry outlet hole on the side wall of the tail end.

7. The tunnel excavation support plate anchoring device according to claim 1, characterized in that: The outer end surface of the sealing plug is provided with an exhaust hole connected with a drilled hole for installing the anchor rod.

8. The tunnel excavation support plate anchoring device according to any one of claims 1 to 7, characterized in that: The width of the gap between the end of the positioning tube and the outer wall of the anchor rod is 0.4-1 mm.

9. The tunnel excavation support plate anchoring device according to any one of claims 1 to 7, characterized in that: It also includes a fastening nut and an arched pad. The fastening nut, the arched pad and the sealing plug are movably sleeved on the head end of the anchor rod in sequence, and the fastening nut is threadedly connected to the anchor rod.

Images