Sampling device for tunnel primary support sprayed concrete

Abstract

The utility model provides a sampling device for tunnel preliminary bracing sprayed concrete, which relates to the technical field of concrete sampling and comprises a fixed unit and a movable unit, the fixed unit comprises a bottom plate and fixed plates on two sides of the bottom plate, and the movable unit comprises a movable plate detachably connected with the fixed unit. Pull rings are fixedly connected to the tops of the movable plate and the fixed plate, a plurality of locking plates are fixedly arranged on the side, away from the bottom plate, of the fixed plate and are angle steel components, one side of each locking plate is fixedly connected to the position, close to the bottom, of the fixed plate, the other side of each locking plate is parallel to the bottom plate and provided with round holes, and expansion bolts are connected to the round holes. The device has the beneficial effects that the design is reasonable, the structure is simple, safety and reliability are realized, the device is simple and easy to install, the sampling size and the authenticity of data are ensured, the labor intensity is reduced, the safety in the sampling process is improved, and the current problems of a plastic test mold and a cast iron test mold are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of concrete sampling technology, and in particular to a sampling device for shotcrete used in the initial support of tunnels. Background Technology

[0002] There are two existing types of shotcrete sampling devices for initial tunnel support: plastic large-plate molds and cast iron large-plate molds. Due to the high pressure of shotcrete, plastic molds are prone to breakage, which affects the sample size, increases costs, and poses safety hazards for specimen cutting. Cast iron molds are bulky and cannot be fixed at the tunnel arch and waist, limiting the acquisition of accurate and effective construction data.

[0003] Solving the aforementioned technical problems is the challenge facing this utility model. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a sampling device for shotcrete in the initial support of tunnels. This device is rationally designed, simple in structure, safe and reliable, easy to install, ensures the authenticity of sampling dimensions and data, reduces labor intensity, improves safety during the sampling process, and effectively solves the problems currently existing with plastic and cast iron molds.

[0005] The technical solution adopted by this utility model to solve its technical problem is: This utility model provides a sampling device for shotcrete in the initial support of tunnels, including a fixed unit and a movable unit, wherein the fixed unit includes a base plate and fixed plates on both sides of the base plate.

[0006] The movable unit includes a movable plate that is detachably connected to the fixed unit.

[0007] The base plate is a rectangular plate, with opposite sides perpendicularly connected to the fixing plate, and the length of the fixing plate matches the length of the base plate;

[0008] The two fixing plates are fixedly connected to the base plate to form a U-shaped plate.

[0009] Each of the fixed plates has a vertically arranged first slot symmetrically arranged near both ends at the top of the first slot, and the movable plate is movably connected in the first slot.

[0010] The movable plate is provided in two parts, which are respectively movably connected to both ends of the fixed plate;

[0011] The bottom of the movable plate is symmetrically provided with second slots near both ends, and the second slots penetrate the first slot.

[0012] Both the movable plate and the fixed plate have pull rings fixedly connected to their tops.

[0013] A number of locking plates are fixedly installed on the side of the fixing plate away from the base plate. The locking plates are angle steel components, one side is fixedly connected to the fixing plate near the bottom, and the other side is parallel to the base plate and has a round hole, at which expansion bolts are connected.

[0014] The beneficial effects of this utility model are as follows: This sampling device can be used independently or connected to the initial support. The entire device is divided into four parts: 1. A movable plate for assembly and isolation; 2. A fixed plate that can be assembled with the movable plate to ensure that the size of the sample meets the specifications; 3. A pull ring for easy disassembly of the movable and fixed units; 4. Several anchor locking plates welded to the fixed plate, with a reserved 18mm diameter hole in the middle for expansion bolts, mainly controlling the stability of the entire sampling system and ensuring that the sampling device does not flip or shift laterally. When sampling the top slab for shotcreting, the entire sampling device is permanently fixed to the rock surface with expansion bolts, or it can be welded to steel arch frames to ensure the stability of the sampling device; when sampling the arch waist and other parts for shotcreting, it can be sampled close to the fixed rock surface. This device achieves simple installation, ensures the authenticity of sampling size and data, reduces labor intensity, improves safety during the sampling process, and effectively solves the problems currently existing with plastic and cast iron molds. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0017] In the attached drawings, the reference numerals are as follows: 1. Fixed unit; 101. Base plate; 102. Fixed plate; 103. First slot; 2. Movable unit; 201. Movable plate; 202. Second slot; 3. Pull ring; 4. Locking plate; 401. Round hole. Detailed Implementation

[0018] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0019] See Figures 1 to 2As shown, this embodiment is a sampling device for shotcrete in the initial support of tunnels, including a fixed unit 1 and a movable unit 2. The fixed unit 1 includes a base plate 101 and fixed plates 102 on both sides of the base plate 101. The base plate 101 is a rectangular plate, and the fixed plates 102 are perpendicularly and fixedly connected to the opposite sides. The length of the fixed plates 102 matches the length of the base plate 101. The two fixed plates 102 are fixedly connected to the base plate 101 to form a U-shaped plate. Several locking plates 4 are fixedly installed on the side of the fixed plate 102 away from the base plate 101. The locking plates 4 are angle steel components, and one side is fixedly connected to the fixed plates 102 near the bottom. The other side is parallel to the base plate 101 and has a round hole 401. Expansion bolts are connected to the round hole 401.

[0020] The movable unit 2 includes a movable plate 201 that is detachably connected to the fixed unit 1. Each fixed plate 102 has a vertically arranged first slot 103 symmetrically arranged near both ends of its top. The movable plate 201 is movably connected in the first slot 103. There are two movable plates 201, which are movably connected to both ends of the fixed plate 102 respectively. The second slot 202 is symmetrically arranged near both ends of the bottom of the movable plate 201. The second slot 202 passes through the first slot 103.

[0021] Pull rings 3 are fixedly connected to the top of both the movable plate 201 and the fixed plate 102.

[0022] The actual construction of this utility model includes the following steps: on-site construction preparation, processing and manufacturing of sampling devices, fixing the sampling devices to the arch top rock surface or vertically fixing them to the arch waist part after they are connected by locking plates 4, spraying concrete support, removing the movable plate 201, taking out the sprayed concrete specimens, performing pressure tests after cutting the specimens, and re-sampling and sampling after finding the cause if the test is unqualified, re-sampling and filling the sampled parts, cutting the pull ring 3 of the sampling device, tunnel waterproofing layer construction, and secondary lining concrete construction.

[0023] This embodiment is made of 5mm steel plate and φ6mm round steel. The movable plate 201 is 380mm×120mm in size, the fixed plate 102 is 480mm×120mm in size, the pull ring 3 is a φ120mm semicircle, and the welding length with the fixed plate 102 and the movable plate 201 is 50mm. The locking plate 4 is four 50mm×50mm punched angle steels, which are fixed to the rock wall with matching expansion bolts. The round hole is φ18mm. The movable plate 201 and the fixed plate 102 are connected by a reserved 5mm×60mm first slot 103 and a second slot 202 for snap-fit.

[0024] The technical features of this utility model not described can be implemented by or by using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this utility model, and this utility model is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should also be within the protection scope of this utility model.

Claims

1. A sampling device for shotcrete used in the initial support of tunnels, characterized in that, It includes a fixed unit (1) and a movable unit (2), wherein the fixed unit (1) includes a base plate (101) and fixed plates (102) on both sides of the base plate (101); The active unit (2) includes an active plate (201) that is detachably connected to the fixed unit (1).

2. The sampling device for shotcrete in the initial support of tunnels according to claim 1, characterized in that, The base plate (101) is a rectangular plate, with the fixing plate (102) perpendicularly and fixedly connected to the opposite sides. The length of the fixing plate (102) matches the length of the base plate (101). The two fixing plates (102) are fixedly connected to the base plate (101) to form a U-shaped plate.

3. The sampling device for shotcrete in the initial support of tunnels according to claim 1, characterized in that, Each of the fixed plates (102) has a vertically arranged first slot (103) symmetrically arranged near both ends at the top, and the movable plate (201) is movably connected in the first slot (103).

4. The sampling device for shotcrete in the initial support of tunnels according to claim 3, characterized in that, Two movable plates (201) are provided, which are respectively movably connected to the two ends of the fixed plate (102); The bottom of the movable plate (201) is symmetrically provided with second slots (202) near both ends, and the second slots (202) penetrate the first slot (103).

5. The sampling device for shotcrete in the initial support of tunnels according to claim 1, characterized in that, Pull rings (3) are fixedly connected to the top of both the movable plate (201) and the fixed plate (102).

6. The sampling device for shotcrete in the initial support of tunnels according to claim 1, characterized in that, A plurality of locking plates (4) are fixedly installed on the side of the fixing plate (102) away from the bottom plate (101). The locking plate (4) is an angle steel component. One side is fixedly connected to the fixing plate (102) near the bottom, and the other side is parallel to the bottom plate (101) and has a round hole (401). An expansion bolt is connected to the round hole (401).

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