Detection hole reserving device for tunnel primary support detection

Abstract

The utility model belongs to the technical field of tunnel primary support detection equipment, and particularly relates to a detection hole reserving device for tunnel primary support detection, which comprises a mounting seat, a steel arch frame, a straight pipe, geotechnical cloth and a fixing component, the mounting seat is detachably connected with the steel arch frame, and the two ends and the outer wall of the straight pipe are wrapped with multiple layers of geotechnical cloth. The straight pipe is arranged on one side of the steel arch frame, the two ends of the straight pipe extend out of the front surface and the rear surface of the steel arch frame correspondingly, and the straight pipe wrapped by the geotechnical cloth is fixed to the mounting base through the fixing assembly; the inner channel of the straight pipe or the cavity formed after the straight pipe is pulled out is the preformed hole for tunnel primary support cavity detection, the treatment procedure after concrete spraying is completed can be simplified, the straight pipe is wrapped with the geotechnical cloth, the structure is simple, installation is convenient, impurities such as silt and chippings in the concrete spraying process can be prevented from entering the inner channel of the straight pipe, and the construction efficiency is improved. Excellent water permeability is achieved, and drainage of the inner wall of the tunnel is facilitated.

Description

A device for pre-drilling inspection holes for tunnel initial support inspection Technical Field

[0001] This utility model belongs to the technical field of tunnel initial support detection equipment, specifically relating to a detection hole reservation device for tunnel initial support detection. Background Technology

[0002] With the continuous development of road construction, tunnel projects are becoming more and more common, and various problems are also emerging along with tunnel construction. The initial support of a tunnel is the direct stress-bearing body for the stability of the surrounding rock, and the problem of voids in the initial support seriously affects the safety of the tunnel.

[0003] During the initial support construction of the tunnel, in order to check whether the shotcrete of the initial support is dense and whether there are any voids, it is necessary to check the voids in the initial support. Usually, the drilling method is used to drill holes at intervals in the tunnel wall after the shotcrete is completed. However, since it is impossible to accurately control the verticality and depth when drilling, it is easy to cause measurement deviations.

[0004] Patent CN221609994U discloses a device for pre-reserving detection holes for primary support tunnel detection, comprising: at least one clamp connected to a steel arch frame, the clamp having a receiving cavity; a circular tube with a through cavity inside, the circular tube being able to be inserted into the receiving cavity, the circular tube being clamped and fixed to the steel arch frame by the clamp; a sealing mechanism for sealing both ends of the circular tube, the sealing mechanism being detachably connected to the circular tube; after concrete spraying is completed, the sealing mechanism at one end is removed, and the hole where the through cavity inside the circular tube is located is the pre-reserved hole for detecting voids in the primary support of the tunnel.

[0005] However, after the above-mentioned device is sprayed with concrete, the concrete at the location of the sealing mechanism still needs to be removed and leveled, which presents a problem of complicated subsequent processing procedures and requires further improvement. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, this utility model proposes a detection hole reservation device for tunnel initial support detection, which is easy to install and can simplify the processing procedures after concrete spraying.

[0007] To solve the above-mentioned technical problems, this utility model provides a detection hole reservation device for tunnel initial support detection, comprising:

[0008] Mounting base, detachably connected to the steel arch frame;

[0009] A straight pipe, with multiple layers of geotextile wrapped around both ends and the outer wall, is located on one side of the steel arch frame, and both ends extend beyond the front and rear surfaces of the steel arch frame, respectively.

[0010] The straight pipe, wrapped in geotextile, is fixed to the mounting base by the fixing component.

[0011] After the concrete spraying is completed, the geotextile at the outer end of the straight pipe is removed. The internal channel of the straight pipe or the cavity formed after the straight pipe is pulled out is the reserved hole for the detection of the initial support void of the tunnel.

[0012] Preferably, in the above solution, the mounting base includes a slot and a fastening bolt. The mounting base is disposed on the front surface of the steel arch frame. The slot is disposed on one side of the mounting base and matches the side edge of the steel arch frame. The fastening bolt is disposed on the other side of the mounting base. Tightening the fastening bolt connects and fixes the two sides of the mounting base to the two sides of the steel arch frame.

[0013] Preferably, in the above scheme, the mounting base further includes a rubber block, one side of which is disposed on the inner wall of the slot, and the other side is in contact with the side edge of the steel arch frame.

[0014] Preferably, in the above scheme, the mounting base further includes an ear plate and a threaded hole. The ear plate is located on the other side of the mounting base, and the threaded hole is located on the surface of the ear plate and its opening direction is perpendicular to the side of the steel arch frame. The threaded hole matches the fastening bolt.

[0015] Preferably, in the above solution, the fixing component includes a positioning plate and cable ties. The positioning plate matches the straight pipe and is fixed to the outside of the slot. The straight pipe wrapped with geotextile is fixed to the positioning plate by the cable ties.

[0016] Preferably, in the above scheme, the length of the positioning plate is less than the distance between the front and rear surfaces of the steel arch frame, and the extension direction is perpendicular to the front surface of the steel arch frame.

[0017] Preferably, in the above scheme, the straight pipe is set as a round pipe, and the positioning plate is set as an arc plate that matches the round pipe.

[0018] Preferably, in the above solution, the fixing component further includes protrusions, and a plurality of protrusions are spaced apart on the convex surface of the arc plate.

[0019] Preferably, the above scheme further includes a reinforcing mesh, which is disposed near the rear surface of the steel arch frame, and the straight pipe wrapped with geotextile is erected on the reinforcing mesh.

[0020] Preferably, in the above scheme, the straight pipe is a PVC pipe with a smooth outer surface, and the outer surface of the straight pipe is coated with lubricating oil.

[0021] Compared with existing technologies, this utility model has the following beneficial effects:

[0022] 1. A device for pre-reserving detection holes for tunnel initial support inspection, comprising a mounting base, a steel arch frame, a straight pipe, geotextile, and fixing components. The mounting base and the steel arch frame are detachably connected. The straight pipe, wrapped with geotextile, is fixed to the mounting base by the fixing components. After concrete spraying, the geotextile at the outer end of the straight pipe is removed. The internal channel of the straight pipe or the cavity formed after the straight pipe is pulled out is the pre-reserved hole for detecting voids in the tunnel initial support. This simplifies the processing procedures after concrete spraying. Moreover, the geotextile wrapping of both ends and the outer wall of the straight pipe results in a simple structure and convenient installation. It can intercept impurities such as mud and debris during concrete spraying, preventing them from entering the internal channel of the straight pipe. It also has excellent permeability, facilitating drainage of the tunnel inner wall.

[0023] 2. The mounting base of this utility model includes a slot, a fastening bolt, and a rubber block. The slot is located on one side of the mounting base and matches the side edge of the steel arch frame. One side of the rubber block is located on the inner wall of the slot, and the other side contacts the side edge of the steel arch frame. The fastening bolt is located on the other side of the mounting base. Tightening the fastening bolt connects and fixes the two sides of the mounting base to the two sides of the steel arch frame. The rubber block can increase the friction between the slot and the steel arch frame.

[0024] 3. The fixing component in this utility model includes a positioning plate, cable ties, and protrusions. The straight pipe is set as a round pipe, the positioning plate is set as an arc plate that matches the round pipe and is fixed to the outside of the slot, and multiple protrusions are spaced apart on the convex surface of the arc plate. The straight pipe wrapped with geotextile is fixed to the positioning plate by cable ties. The cable ties are restricted within the spacing of the protrusions, which can further improve the installation stability of the round pipe and the arc plate.

[0025] 4. The straight pipe in this utility model is a PVC pipe with a smooth outer surface, and the outer surface of the straight pipe is coated with lubricating oil. After the concrete is sprayed, it is easier to pull out the straight pipe. The cavity formed after pulling out the pipe is used as a reserved hole for the detection of the initial support void in the tunnel. Attached Figure Description

[0026] Figure 1 is a first-view structural schematic diagram of a detection hole reservation device for tunnel initial support detection according to the present invention.

[0027] Figure 2 is a second-view structural schematic diagram of a detection hole reservation device for tunnel initial support detection according to the present invention.

[0028] Figure 3 is a structural schematic diagram of the mounting base and fixing components of this utility model.

[0029] Figure 4 is a schematic diagram of the installation structure of the straight pipe wrapped with geotextile according to this utility model.

[0030] Figure 5 is a cross-sectional view along the AA direction in Figure 4 of this utility model.

[0031] Among them, 1-mounting base, 11-slot, 12-fastening bolt, 13-rubber block, 14-ear plate, 2-steel arch frame, 3-straight pipe, 4-geotextile, 5-fixing component, 51-positioning plate, 52-cable tie, 53-protrusion, 6-steel mesh. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0036] As shown in Figures 1 to 5, this utility model discloses a device for pre-reserving detection holes for tunnel initial support inspection, including a mounting base 1, a steel arch frame 2, a straight pipe 3, geotextile 4, and a fixing component 5. The mounting base 1 is detachably connected to the steel arch frame 2. The straight pipe 3 is wrapped with multiple layers of geotextile 4 at both ends and on its outer wall. The straight pipe 3 is located on one side of the steel arch frame 2, and its two ends extend beyond the front and rear surfaces of the steel arch frame 2, respectively. The straight pipe 3 wrapped with geotextile 4 is fixed to the mounting base 1 by the fixing component 5. After the concrete spraying is completed, the geotextile 4 at the outer end of the straight pipe 3 is removed. The internal channel of the straight pipe 3 or the cavity formed after the straight pipe 3 is pulled out is the pre-reserved hole for detecting voids in the tunnel initial support. This simplifies the processing procedures after the concrete spraying is completed. Moreover, the use of geotextile 4 to wrap the two ends and the outer wall of the straight pipe 3 results in a simple structure and convenient installation. It can intercept impurities such as mud and sand and debris during the concrete spraying process, preventing them from entering the internal channel of the straight pipe 3. It also has excellent permeability, which facilitates drainage of the tunnel inner wall.

[0037] It is worth noting that after the concrete spraying is completed, the straight pipe 3 protruding from the concrete surface can be directly cut off, and the internal channel of the straight pipe 3 can be used as a reserved hole for the detection of voids in the initial support of the tunnel. Preferably, the straight pipe 3 is a PVC pipe with a smooth outer surface, and the outer surface of the straight pipe 3 is coated with lubricating oil, making it easier to pull out the straight pipe 3 after the concrete spraying is completed. The cavity formed after pulling out the pipe can be used as a reserved hole for the detection of voids in the initial support of the tunnel. In addition, this embodiment also includes a reinforcing mesh 6, which is set near the rear surface of the steel arch 2. The straight pipe 3, which is wrapped with geotextile 4, is erected on the reinforcing mesh 6, so that the straight pipe 3 can be firmly installed on the steel arch 2 and the reinforcing mesh 6.

[0038] Referring again to Figures 3 and 4, in this embodiment, the mounting base 1 includes a slot 11 and a fastening bolt 12. The mounting base 1 is located on the front surface of the steel arch frame 2. The slot 11 is located on one side of the mounting base 1 and matches the side edge of the steel arch frame 2. The fastening bolt 12 is located on the other side of the mounting base 1. Tightening the fastening bolt 12 connects and fixes both sides of the mounting base 1 to both sides of the steel arch frame 2. In use, the mounting base 1 is placed on the front surface of the steel arch frame 2 and moved horizontally until the slot 11 snaps onto one side edge of the steel arch frame 2. The fastening bolt 12 is then tightened until its tail abuts against the other side edge of the steel arch frame 2, thus fixing the mounting base 1 to the steel arch frame 2.

[0039] Furthermore, the mounting base 1 also includes a rubber block 13. One side of the rubber block 13 is located on the inner wall of the slot 11, and the other side contacts the side edge of the steel arch frame 2. When the fastening bolt 12 is tightened, the slot 11 squeezes the rubber block 13, which increases the friction between the slot 11 and the steel arch frame 2 and improves the stability of the mounting base 1. Preferably, the mounting base 1 also includes an ear plate 14 and a threaded hole. The ear plate 14 is located on the other side of the mounting base 1, and the threaded hole is located on the surface of the ear plate 14, with its opening direction perpendicular to the side of the steel arch frame 2. The threaded hole matches the fastening bolt 12.

[0040] Furthermore, the fixing component 5 in this embodiment includes a positioning plate 51 and cable ties 52. The positioning plate 51 matches the straight pipe 3 and is fixed to the outside of the slot 11. The straight pipe 3, wrapped by the geotextile 4, is fixed to the positioning plate 51 by the cable ties 52. Moreover, after the geotextile 4 wraps the straight pipe 3, it is also tied and fixed by the cable ties 52. It is worth noting that the length of the positioning plate 51 is less than the distance between the front and rear surfaces of the steel arch frame 2. It is used to fix the front half of the straight pipe 3, and the steel mesh 6 can support and fix the rear half of the straight pipe 3. The extension direction of the positioning plate 51 is perpendicular to the front surface of the steel arch frame 2, which can ensure the verticality of the straight pipe 3 after installation.

[0041] Furthermore, in this embodiment, the straight pipe 3 is set as a round pipe, and the positioning plate 51 is set as an arc plate that matches the round pipe. The round pipe wrapped by the geotextile 4 is fixed to the concave surface of the arc plate by cable ties 52. Preferably, the fixing component 5 also includes protrusions 53. Multiple protrusions 53 are spaced apart on the convex surface of the arc plate, which can restrict the cable ties 52 within the spacing of the protrusions 53, further improving the installation stability of the round pipe and the arc plate.

[0042] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A device for pre-drilling inspection holes for tunnel initial support inspection, characterized in that, include: The mounting base is detachably connected to the steel arch frame; the straight pipe has multiple layers of geotextile wrapped around both ends and the outer wall, the straight pipe is located on one side of the steel arch frame, and both ends extend beyond the front and rear surfaces of the steel arch frame; the fixing assembly fixes the straight pipe wrapped with geotextile to the mounting base; after the concrete spraying is completed, the geotextile at the outer end of the straight pipe is removed, and the internal channel of the straight pipe or the cavity formed after the straight pipe is pulled out is the reserved hole for the detection of the initial support void of the tunnel.

2. The detection hole pre-reservation device for tunnel initial support detection according to claim 1, characterized in that, The mounting base includes a slot and a fastening bolt. The mounting base is located on the front surface of the steel arch frame. The slot is located on one side of the mounting base and matches the side edge of the steel arch frame. The fastening bolt is located on the other side of the mounting base. Tightening the fastening bolt connects and fixes the two sides of the mounting base to the two sides of the steel arch frame.

3. The detection hole pre-reservation device for tunnel initial support detection according to claim 2, characterized in that, The mounting base also includes a rubber block, one side of which is disposed on the inner wall of the slot, and the other side is in contact with the side edge of the steel arch frame.

4. A detection hole pre-reservation device for tunnel initial support detection according to claim 3, characterized in that, The mounting base also includes an ear plate and a threaded hole. The ear plate is located on the other side of the mounting base, and the threaded hole is located on the surface of the ear plate and is opened in a direction perpendicular to the side of the steel arch frame. The threaded hole is matched with the fastening bolt.

5. A detection hole pre-reservation device for tunnel initial support detection according to claim 2, characterized in that, The fixing component includes a positioning plate and cable ties. The positioning plate matches the straight pipe and is fixed to the outside of the slot. The straight pipe, which is wrapped with geotextile, is fixed to the positioning plate by the cable ties.

6. A detection hole pre-reservation device for tunnel initial support detection according to claim 5, characterized in that, The length of the positioning plate is less than the distance between the front and rear surfaces of the steel arch frame, and its extension direction is perpendicular to the front surface of the steel arch frame.

7. A detection hole pre-reservation device for tunnel initial support detection according to claim 5, characterized in that, The straight tube is configured as a round tube, and the positioning plate is configured as an arc plate that matches the round tube.

8. A detection hole pre-reservation device for tunnel initial support detection according to claim 7, characterized in that, The fixing component also includes protrusions, and a plurality of the protrusions are spaced apart on the convex surface of the arc plate.

9. A detection hole pre-reservation device for tunnel initial support detection according to claim 1, characterized in that, It also includes a steel mesh, which is disposed near the rear surface of the steel arch frame, and the straight pipe wrapped with geotextile is erected on the steel mesh.

10. A detection hole pre-reservation device for tunnel initial support detection according to claim 1, characterized in that, The straight pipe is a PVC pipe with a smooth outer surface, and the outer surface of the straight pipe is coated with lubricating oil.

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