Novel mining reinforcing mesh connecting device for weakly cemented stratum

Abstract

The utility model discloses a novel mining reinforcing mesh connecting device for a weakly cemented stratum, and relates to the technical field of weakly cemented soft rock roadway support, the novel mining reinforcing mesh connecting device comprises a novel reinforcing mesh and a middle connecting device, the connecting device is used for connecting two adjacent reinforcing mesh support parts, and each reinforcing mesh support part comprises a steel wire with triangular bulge structures at two ends; the reinforcing steel bars are welded to form a net, the end of each reinforcing steel bar is of a triangular protrusion structure, the connecting device is a tubular device with clamping grooves formed in the two ends, each clamping groove is composed of a clamping piece and a clamping spring, and when external force is exerted on the clamping grooves, the clamping springs are stressed to be lengthened, and the clamping pieces can rotate to the maximum limiting position. According to the device, reinforcement mesh support continuity during roadway tunneling is guaranteed, the connecting device is fast and convenient to install, more operation time is saved compared with existing iron wire connection or other connection modes, large connection strength can be provided, and net bags and even local roof fall accidents caused by reinforcement mesh cracking are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel support, and is a new type of steel mesh connecting device for weakly cemented stratum mines. Background Art

[0002] As the main energy source in my country, coal has played a vital role in economic and social development. my country's coal mines are mainly mined underground, and a large number of tunnels need to be excavated underground. Tunnel support must be used to ensure the smooth flow of tunnels during their service life. More than 90% of the existing tunnels use combined support such as anchor rods, anchor cables, and steel mesh, which consumes a large amount of steel mesh every year. As the tunnel excavation extends, the tunnel support structure also advances. The connection of steel mesh is an important process in tunnel support. The existing connection method is mainly wire connection, which has slow connection speed and low strength. In particular, soft rock tunnels in weakly cemented strata are prone to large deformation, which will break the wire at the connection of the steel mesh, and it is easy to form a net bag in the later stage, and even cause local roof leakage in the tunnel, threatening the safety of underground construction. Summary of the invention

[0003] In order to solve the above technical problems, the utility model provides a new type of steel mesh connection device for weakly cemented stratum mines. The supporting components have the characteristics of light weight, high strength, and convenient construction, which is convenient for underground transportation and construction.

[0004] To achieve the above purpose, the utility model provides the following scheme: a new type of steel mesh and connecting device for mining, characterized in that the structure includes a new type of steel mesh and an intermediate connecting device, the connecting component is used to connect two adjacent steel mesh support components, and the steel mesh support component includes a steel mesh and a steel mesh protruding structure. The new steel mesh support structure is welded by fine steel bars, and steel meshes of different mesh sizes and sizes can be welded according to requirements. A triangular protruding structure is welded at the end of the mesh, and the protruding structure can generally be half the length of the mesh side, which is convenient for the construction of tunnel support of a certain specification. The connecting device consists of three parts, namely a connecting pipe, a connecting device card, and a connecting device clip. The connecting pipe is made of a plastic steel hollow pipe, and the pipe length can be the length of the mesh or slightly less than the length of the mesh. One end of the card is connected to the connecting pipe, and the other end is supported by the clip. In the initial state, the card can move in the direction of the clip, and after the external force is removed, it returns to the initial position under the elastic force of the clip; because the connection is fixed, the card cannot move in the direction away from the clip. When the tunnel forward support needs to be networked, as shown in the figure, the end of the steel mesh is squeezed into the card slot, and the triangular protrusion of the steel mesh squeezes the card. When the protrusion completely passes through the card, the card returns to its initial position under the action of the spring. The card and the protrusion of the steel mesh end squeeze each other and cannot be separated.

[0005] According to a further technical solution, the end of the steel mesh supporting structure is a triangular protrusion.

[0006] As a further technical solution, the steel mesh support structure can be welded with continuous or intermittent triangular protrusions for connection between steel meshes according to different support strength requirements of the tunnel.

[0007] As a further technical solution, the steel mesh support structure can be manufactured according to the tunnel support size to facilitate material construction and transportation.

[0008] According to a further technical solution, the connecting device is made of tubular plastic steel, has a simple structure, is light in weight, and has the characteristics of being easy to construct and having high construction efficiency compared to existing wire connections or other connections.

[0009] A further technical solution is that the connection device is made of tubular plastic steel, with a card and a clip inside, which can prevent the connection of the steel mesh from being disconnected after being connected to the steel mesh with triangular protrusions at the end. Compared with the existing wire connection or other connections, it has the characteristics of high connection strength, which can prevent the mesh bag or even partial roof leakage caused by the disconnection of the steel mesh connection.

[0010] The utility model also provides a construction method of a novel steel mesh connecting device for mining, comprising the following steps:

[0011] Step 1: Determine the connection strength between the new steel meshes according to the tunnel design requirements;

[0012] Step 2: Based on the tunnel construction strength requirements in step 1, determine the strength and number of triangular protrusions welded on the new steel mesh. To ensure uniform stress on the entire new steel mesh, the triangular protrusions at the welding end should be evenly arranged;

[0013] Step 3: According to the progress of the tunnel excavation cycle and the size of the tunnel, determine the number of steel meshes to be connected each time, and use the intermediate connection device to connect the steel meshes that need to be connected in advance before laying the steel meshes on the top plate;

[0014] Step 4: Install an intermediate connecting device at the end of the existing new steel mesh on the top plate, connect the steel mesh connected in step 3 with the existing steel mesh on the top plate, ensure that the end protrusion structures of the two steel meshes correspond in sequence, and install the triangular protrusion at the end of the connected steel mesh into the other end of the intermediate connecting device;

[0015] Step 5. During the installation of the triangular protrusion at the end of the new steel mesh and the middle connecting device described in Steps 3 and 4, the triangular protrusion structure at the end is inserted into the tubular connecting device. The insertion depth should completely pass through the card so that the card returns to its initial position under the elastic force of the retaining spring. The card is limited in position to fix the end of the steel mesh inside the tubular device.

[0016] Step 6. After the steel mesh is subjected to external force, the bulge at the end of the steel mesh squeezes the tubular device card, and the steel mesh is stretched to relieve the pressure in the weakly cemented soft rock tunnel, thus achieving pressure-relieving support for the support structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a new steel mesh provided by the utility model;

[0019] Figure 2 A schematic diagram of the detailed protruding structure of the end of the new steel mesh provided by the utility model;

[0020] Figure 3 A schematic diagram of a tubular connecting device provided by the utility model;

[0021] Figure 4 A connection demonstration diagram provided for the utility model;

[0022] Figure 5 This is a demonstration diagram of the steel mesh provided by the utility model being connected after being stretched.

[0023] Explanation of the accompanying drawings: 1. New steel mesh steel bars; 2. New steel mesh steel bar welding points; A. Detailed schematic diagram of the protruding structure at the end of the new steel mesh; 3. Triangular end protruding structure; 4. Steel mesh steel bars; 5. Tubular connecting device card; 6. Tubular connecting device retaining spring; 7. Tubular part of the tubular connecting device; 8. Extendable distance. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model aims to provide a novel steel mesh support structure and construction method, which can overcome the drawbacks of existing wire binding support. The support components have small size and high strength, and are convenient for underground transportation and construction.

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] like Figure 1The figure shows a schematic diagram of the new steel mesh provided by the utility model. The construction unit can weld new steel mesh steel bars 1 of different sizes by changing the positions of the welding points of the new steel mesh steel bars according to the specific tunnel construction specifications and support strength requirements; and weld the triangular end raised structure 3 according to the support strength requirements.

[0028] Figure 2 This is a schematic diagram of the details of the end protrusion structure provided by the utility model. The length of the protrusion is generally half the length of the steel mesh grid, and the height of the triangular protrusion is the diameter of the steel mesh steel bar, or slightly larger than its diameter.

[0029] Figure 3 The schematic diagram of the tubular connection device provided by the utility model is generally the length of the new steel mesh grid, or slightly larger than its length. The diameter of the tubular device should be slightly larger than the total height of the end protrusion plus the diameter of the steel bar, so that the end of the new steel mesh can be smoothly inserted into the tubular device. A blocking device is set at the end of the tubular device, which is a card and a spring. One end of the card is connected to the pipe wall, and the other end is connected to the spring. The card can perform compression spring movement under the action of external force; under the connection of the tubular device, the card cannot move away from the spring.

[0030] Figure 4 This is a demonstration diagram of the initial position connection of the steel mesh provided by the utility model. The end of the new steel mesh is inserted into the tubular connection device, and the card is compressed under the squeezing action of the triangular end protrusion. When the triangular protrusion completely passes through the card, the spring force causes the card to reopen. Under the force of the card and the triangular protrusion, the end of the steel mesh is firmly fixed.

[0031] Figure 5 This is a demonstration diagram of the connection of the steel mesh after stretching provided by the utility model. After the end of the steel mesh is subjected to force, the card is squeezed until it is stretched to the maximum distance.

Claims

1. A new type of steel mesh connection device for weakly cemented strata mines, characterized in that: This structure includes a new type of steel mesh and an intermediate connecting device, wherein the intermediate connecting device is used to connect two adjacent new type of steel mesh support structures, wherein the steel mesh support structure includes a steel mesh and a protruding structure at the end of the steel mesh; the new type of steel mesh support structure is welded by steel bars, and steel meshes of different mesh sizes and sizes can be welded according to requirements; a triangular protruding structure is welded at the end of the mesh, and the protruding structure can generally be half the length of the mesh side, so as to facilitate the support construction of the tunnel according to the specifications; the connecting device is composed of three parts, namely a connecting pipe, a connecting device card, and a connecting device retaining spring; The connecting pipe is made of plastic steel hollow pipe. The diameter of the connecting pipe is generally slightly larger than the size of the protrusion at the end of the steel mesh. The tube length can be the length of the grid or slightly larger than the length of the grid. One end of the card is connected to the connecting pipe, and the other end is supported by a retaining spring. In the initial state, the card can move in the direction of the retaining spring, and restore to its initial position under the elastic force of the retaining spring after the external force is removed. The card is connected and fixed to the tubular device, and can rotate within a certain range after being subjected to external force until the maximum distance position. When the forward support of the tunnel requires the continuation of the mesh, the end of the steel mesh is squeezed into the slot, and the triangular protrusion of the steel mesh squeezes the card. When the protrusion completely passes through the card, the card returns to its initial position under the action of the spring. The card and the protrusion at the end of the steel mesh squeeze each other and cannot separate.

2. The new steel mesh connection device for weakly cemented strata mines according to claim 1 is characterized in that: The end of the steel mesh supporting structure is a triangular protrusion.

3. The new type of steel mesh connection device for weakly cemented stratum mines according to claim 1 is characterized in that: The steel mesh support structure can be provided with triangular protrusions continuously or at intervals according to different support strength requirements of the tunnel.

4. The new steel mesh connection device for weakly cemented stratum mines according to claim 1 is characterized in that: The steel mesh support structure can be manufactured according to the tunnel support size.

5. The new type of steel mesh connection device for weakly cemented stratum mines according to claim 1 is characterized in that: The connecting device is made of tubular plastic steel.

6. The new type of steel mesh connection device for weakly cemented stratum mines according to claim 1 is characterized in that: The connecting device is made of tubular plastic steel and has a card and a retaining spring inside. After being connected to the steel mesh with triangular protrusions at the end, the steel mesh can be extended within a certain distance after being subjected to external force.

Images