A hanging net device for tunnel shotcrete work

Abstract

The utility model provides a kind of net hanging device for tunnel shotcrete operation, including steel sheet, connecting piece, nut and reinforcing mesh;The center of the steel sheet is provided with anchor hole, for being worn in the exposed end of anchor rod of initial lining concrete;The nut is used to be installed in exposed end of anchor rod, to abut the waterproof layer on the surface of initial lining concrete with the steel sheet;The connecting piece is installed on steel sheet, the connecting piece extends to all around and extends to the direction away from initial lining concrete and forms multiple connecting points, the spacing of each connecting point with initial lining concrete is equal, the connecting point and the reinforcing mesh are tied and fixed.The device has the advantages of net hanging and paving by means of anchor rod of initial lining layer, which can meet the needs of waterproof layer fixation and ensure the stability of secondary lining net hanging.

Description

Technical Field

[0001] This utility model relates to the field of tunnel concrete construction technology, specifically to a netting device for tunnel shotcrete operations. Background Technology

[0002] Currently, the main methods for tunnel lining during construction are cast-in-place concrete lining and shotcrete lining.

[0003] Shotcrete lining construction is mainly divided into plain concrete construction, anchor bolt shotcrete construction, anchor bolt mesh shotcrete construction, and steel frame shotcrete construction.

[0004] The support mesh used in anchor bolt shotcrete construction can be classified according to its material into steel mesh, wire mesh, steel strip mesh, plastic mesh, and composite mesh, and is laid based on anchor bolts.

[0005] During the construction of secondary lining in tunnels, the waterproof layer laid on the surface of the primary lining layer makes it impossible to add new anchors or small anchor rods for the installation of the secondary lining layer mesh. It can only be installed by connecting with the anchor rods of the primary lining layer, which lacks the function of fixing the waterproof layer.

[0006] At the same time, the waterproof layer reduces the adhesion of concrete to the primary lining during the secondary lining process, and ordinary wire mesh cannot guarantee the adhesion of shotcrete and the overall strength of the secondary lining layer.

[0007] To resolve the aforementioned problems, there is an urgent need to develop a new netting device that can improve adhesion. Utility Model Content

[0008] The purpose of this utility model is to address the shortcomings of existing technologies by providing a mesh hanging device for tunnel shotcrete operations that utilizes anchor bolts in the initial lining layer for mesh hanging installation, which can both meet the requirements for fixing the waterproof layer and ensure the stability of the mesh hanging in the secondary lining.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is: a netting device for tunnel shotcrete operations, comprising a steel plate, connectors, nuts, and a steel mesh;

[0010] An anchor hole is provided at the center of the steel plate for inserting the exposed end of the anchor rod into the initial lining concrete.

[0011] The nut is used to install on the exposed end of the anchor bolt to abut the steel plate against the waterproof layer on the surface of the initial lining concrete;

[0012] The connector is installed on the steel plate. The connector extends in all directions and in a direction away from the initial lining concrete to form multiple connection points. The distance between each connection point and the initial lining concrete is equal. The connection points are tied and fixed to the steel mesh.

[0013] Preferably, the steel plate is a rectangular steel plate, and the anchor hole is located at the center of the rectangular steel plate.

[0014] Preferably, the connector includes two U-shaped steel bars with an outwardly flared opening.

[0015] Preferably, the steel bar is CA-50.

[0016] Preferably, the steel bars in the steel mesh are CA-50.

[0017] Preferably, the center of each of the two reinforcing bars is welded and fixed to the two long sides of the steel plate.

[0018] Preferably, the bending angle of the extended portion of the reinforcing bar is between 120° and 140°.

[0019] Preferably, the end of the steel plate closest to the initial lining concrete is flat.

[0020] Preferably, the exposed end of the anchor bolt has a threaded structure.

[0021] Preferably, the thickness of the steel plate is greater than the diameter of the connector.

[0022] This utility model has substantial features and advancements compared to existing technologies. Specifically, the mesh hanging device designed in this utility model utilizes a steel plate combined with nuts, which cooperate with anchor rods in the primary lining layer to press the steel plate tightly onto the waterproof layer on the surface of the primary lining layer, thereby fixing the waterproof layer. Through the form of steel plate combined with connectors, with anchor rods as the structural foundation, several connection points are formed at a certain distance away from the primary lining layer for binding and fixing with the reinforcing mesh. On the one hand, this can effectively control the stability of the distance between the reinforcing mesh and the primary lining layer, and on the other hand, it can ensure the stability of the reinforcing mesh itself relative to the primary lining layer.

[0023] In summary, the mesh-hanging device provided by this utility model uses the anchor rods of the primary lining layer for mesh-hanging installation, which can not only meet the requirements for fixing the waterproof layer, but also ensure the stability of the secondary lining mesh-hanging, thus effectively solving the technical problems raised. Attached Figure Description

[0024] Figure 1 This is an overall schematic diagram of a netting device for tunnel shotcrete operations according to this utility model.

[0025] Figure 2 This is a cross-sectional view of a netting device for tunnel shotcrete operations according to this utility model.

[0026] In the diagram: 1. Connector; 2. Reinforcing mesh; 3. Steel plate; 4. Nut; 5. Exposed end of anchor bolt; 6. Connection point. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0028] like Figure 1 and Figure 2 As shown, a mesh hanging device for tunnel shotcrete operations includes a steel plate 3, a connector 1, a nut 4, and a steel mesh 2.

[0029] The steel plate 3 is a rectangular steel plate, and the anchor hole is opened at the center of the rectangular steel plate for passing through the exposed end 5 of the anchor rod in the initial lining concrete. The exposed end 5 of the anchor rod is threaded for cooperating with the nut 4.

[0030] The nut 4 is used to install on the exposed end 5 of the anchor bolt to press the steel plate 3 against the waterproof layer on the surface of the initial lining concrete, thereby achieving a tight fixation of the waterproof layer. In a preferred embodiment, the end of the steel plate closest to the initial lining concrete is flat to ensure full contact with the waterproof layer.

[0031] The connector 1 is installed on the steel plate 3. The connector 1 extends in all directions and extends away from the initial lining concrete to form multiple connection points 6. The distance between each connection point and the initial lining concrete is equal. The connection points 6 are tied and fixed to the steel mesh 2. In this embodiment, the steel bars in the steel mesh 2 are CA-50.

[0032] In this embodiment, the steel bar is CA-50, there are two bars, and they are bent into a U-shaped structure. The center of the two steel bars is welded and fixed to the two long sides of the steel plate 3. The thickness of the steel plate 3 is greater than the diameter of the connector 1 and does not extend beyond the back of the steel plate 3, so that the back of the steel plate 3 is kept as flat as possible.

[0033] The U-shaped structure has an outwardly flared opening, and the bending angle of the extended portion of the reinforcing bar relative to the central area is between 120° and 140°. The main purpose is to control the spacing of the connection points 6 and avoid the spacing of the connectors 6 being too narrow.

[0034] The installation process is as follows:

[0035] Before installation: Measure and position the mesh according to the design drawings, install the positioning parts, and ensure accurate installation; use a water gun to remove dust, oil, particles, etc. from the base surface to ensure the base surface is clean;

[0036] Installation: Connect the steel plate 3 to the exposed end 5 of the anchor rod with nuts 4, and adjust the position of the connector by positioning line; place the reinforcing bars and tie them with the connector 1 to finally form the reinforcing mesh 2.

[0037] To ensure proper spacing, concrete pads can be placed to maintain the distance between the steel mesh layer and the base surface, and to ensure that the waterproof layer remains undamaged and undeformed during installation.

[0038] After installation: Check the installation of connectors and steel mesh. After confirming that everything is correct, moisten the base layer with water and then perform shotcrete application.

[0039] This solution connects the anchor rods and the steel mesh layer through the aforementioned mesh-hanging device, ensuring a stable and non-displaceable connection between the steel mesh and the initial lining layer. It also increases the contact area between the mesh-hanging device and the concrete, enhancing concrete adhesion. Furthermore, it ensures the distance between the steel layer in the mesh-hanging device and the base surface, guaranteeing the thickness of the concrete protective layer. The connection points between the connectors and the waterproofing layer also strengthen the fixation of the waterproofing layer and the base layer.

[0040] Finally, it should be noted that: the preferred embodiments of this patent have been described in detail above, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A wire mesh hanging device for shotcrete operations in tunnels, characterized in that: Includes steel plates, connectors, nuts, and reinforcing mesh; An anchor hole is provided at the center of the steel plate for inserting the exposed end of the anchor rod into the initial lining concrete. The nut is used to install on the exposed end of the anchor bolt to abut the steel plate against the waterproof layer on the surface of the initial lining concrete; The connector is installed on the steel plate. The connector extends in all directions and extends away from the initial lining concrete to form multiple connection points. The distance between each connection point and the initial lining concrete is equal. The connection points and the steel mesh are tied and fixed together.

2. The netting device for shotcrete operations in tunnels according to claim 1, characterized in that: The steel plate is a rectangular steel plate, and the anchor hole is opened at the center of the rectangular steel plate.

3. The netting device for shotcrete operations in tunnels according to claim 1, characterized in that: The connector includes two U-shaped steel bars with an outwardly flared opening.

4. The netting device for shotcrete operations in tunnels according to claim 3, characterized in that: The steel bars are of CA-50 specification.

5. The netting device for shotcrete operations in tunnels according to claim 1, characterized in that: The steel bars in the steel mesh are CA-50.

6. The netting device for shotcrete operations in tunnels according to claim 3, characterized in that: The two reinforcing bars are welded and fixed at their centers to the two long sides of the steel plate.

7. The netting device for shotcrete operations in tunnels according to claim 3, characterized in that: The bending angle of the extended portion of the reinforcing bar is between 120° and 140°.

8. The netting device for shotcrete operations in tunnels according to claim 1, characterized in that: The end of the steel plate closest to the initial lining concrete is flat.

9. The netting device for shotcrete operations in tunnels according to claim 1, characterized in that: The exposed end of the anchor rod has a threaded structure.

10. The netting device for shotcrete operations in tunnels according to claim 1, characterized in that: The thickness of the steel plate is greater than the diameter of the connector.

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