Tunnel cable grounding structure

Abstract

The utility model provides a tunnel cable grounding structure, which is characterized in that cable troughs are arranged on two sides of a tunnel and extend along the extending direction of the tunnel, and through ground wires extending along the length direction of the cable troughs are arranged in the cable troughs; the longitudinal grounding steel bars are evenly distributed in the circumferential direction of the tunnel, the circumferential grounding steel bars distributed at equal intervals are arranged in the extending direction of the tunnel, and the longitudinal grounding steel bars and the circumferential grounding steel bars are electrically connected to form a latticed guide net. Longitudinal grounding steel bars, annular grounding steel bars and wiring terminals are adopted to jointly form an electric body and are connected with a grounding body, so that a grounding network is formed, circuits in a tunnel are grounded, L-shaped inner bends are arranged, the grounding network can be distributed in the tunnel in an omnibearing mode, the grounding network is located in a tunnel lining, oxidation can be reduced, and the service life of the tunnel is prolonged. And grounding efficiency is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel cable installation, and in particular relates to a tunnel cable grounding structure. Background Art

[0002] With the development of high-speed railways, the traction load of railways has increased, and the return current of traction substations has also increased. Traditional grounding lines generally connect grounding steel bars to ground wires by welding or clamping with clips. Since many grounding steel bars need to be arranged in the tunnel, the terminal blocks need to be adjusted according to the actual situation during actual construction, which makes welding difficult and the installation accuracy of the terminal blocks is poor.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art. The utility model provides a tunnel cable grounding structure.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A tunnel cable grounding structure, comprising:

[0007] A cable trough, which is arranged on both sides of the tunnel and extends along the extension direction of the tunnel, and a through ground wire extending along the length direction of the cable trough is arranged in the cable trough;

[0008] Longitudinal grounding steel bars, a plurality of the longitudinal grounding steel bars are evenly distributed in the tunnel circumferential direction, a plurality of equidistantly distributed circumferential grounding steel bars are provided in the tunnel extension direction, the longitudinal grounding steel bars and the circumferential grounding steel bars are electrically connected to form a grid-like guide net;

[0009] A plurality of wiring terminals are distributed on the inner wall of the tunnel, and the wiring terminals include a connection end and a wiring head. The connection end extends to the inner wall of the tunnel and has a bolt hole. The line to be grounded is connected to the bolt hole of the connection end through a wiring washer and a bolt.

[0010] The terminal head is parallel to the longitudinal grounding steel bar or the annular grounding steel bar by bending, and the terminal head and the longitudinal grounding steel bar or the annular grounding steel bar are fixed by a clamp.

[0011] Preferably, the annular grounding steel bar is provided with an L-shaped inner bend extending toward the middle of the tunnel at the tunnel arch foot, and the end of the inner bend extends upward inside the tunnel arch foot step. The through ground wire is electrically connected to the inner bend through a wiring terminal, and the inner wall of the tunnel arch foot step is provided with a wiring terminal electrically connected to the inner bend.

[0012] Preferably, a shaping piece is provided at the bending point of the inner bend, and the inner bend is fixed to the shaping piece by welding.

[0013] Preferably, the through ground wire extends along one side corner of the cable trough, and cement mortar for burying the through ground wire and the wiring terminal is provided in the cable trough.

[0014] Preferably, the clamp is a C-shaped metal plate, and the two ends of the clamp extend outward in parallel at the opening of the clamp. One end of the clamp is welded and fixed to the terminal head. The locking stud passes through the two ends of the clamp and is connected to the locking nut to lock it to the corresponding longitudinal grounding steel bar or the annular grounding steel bar.

[0015] Preferably, both sides of the clamp are provided with bite portions bent toward the longitudinal grounding steel bars or the annular grounding steel bars, the bite portions are inclined at a certain angle to the longitudinal grounding steel bars or the annular grounding steel bars, and serrated bite teeth are provided on one side of the bite portion corresponding to the longitudinal grounding steel bars or the annular grounding steel bars.

[0016] Beneficial effects: Longitudinal grounding steel bars, annular grounding steel bars and wiring terminals are used to form an electrical conductor and connected to the grounding body, thereby forming a grounding network to ground the internal circuit of the tunnel. An L-shaped inner bend is set so that the grounding network can be distributed in all directions inside the tunnel. The grounding network is located in the tunnel lining, which can reduce oxidation and ensure effective grounding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0018] Figure 1 A simplified structural diagram of a grounding cable in a specific embodiment provided by the utility model;

[0019] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0020] Figure 3 A schematic diagram of the connection of the grounding terminal in a specific embodiment provided by the utility model;

[0021] Figure 4 It is a structural schematic diagram of a clamping member in a specific embodiment provided by the utility model.

[0022] In the figure: 1. cable trough; 2. circumferential grounding steel bars; 3. longitudinal grounding steel bars; 4. terminal blocks; 5. inner bend; 6. through ground wire; 7. cement mortar; 8. clamps; 9. locking studs; 401. connection end; 402. terminal head; 801. bite portion. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the protection scope of the present invention.

[0024] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0026] like Figure 1-4 As shown, a tunnel cable grounding structure includes a cable trough 1, longitudinal grounding steel bars 3, and annular grounding steel bars 2. The cable trough 1 is arranged on both sides of the tunnel. The two tunnels extend respectively along the extension direction of the tunnel. The cable trough 1 can be used for routing other lines of the tunnel. A through ground wire 6 extending along its length is provided in the cable trough 1. The through ground wire 6 is not wrapped with an insulating layer outside, so that it can be directly grounded. The length of the through ground wire 6 is adapted to the tunnel, so as to meet the grounding requirements within the entire length of the tunnel. A plurality of longitudinal grounding steel bars 3 are evenly distributed in the circumferential direction of the tunnel. A plurality of equidistantly distributed annular grounding steel bars 2 are provided in the extension direction of the tunnel. The longitudinal grounding steel bars 3 are evenly distributed in the circumferential direction of the tunnel. The steel bars 3 and the annular grounding steel bars 2 are electrically connected to form a grid-like guide net, which realizes current guidance in all directions in the tunnel. A concrete lining corresponding to the grid-like guide net is provided on the inner side of the tunnel. The annular grounding steel bars 2 are provided with an L-shaped inner bend 5 extending toward the middle of the tunnel at the tunnel arch foot. The inner bend 5 is used to pass through the tunnel arch foot step at the bottom of the tunnel. The end of the inner bend 5 extends upward inside the tunnel arch foot step, so that the electrical equipment on the inner side of the tunnel arch foot step can be grounded. The through ground wire 6 is electrically connected to the inner bend 5 through the terminal 4, and the inner wall of the tunnel arch foot step is provided with a terminal 4 electrically connected to the inner bend 5.

[0027] In the present application, the longitudinal grounding steel bar 3 is the inner longitudinal reinforcement of the tunnel secondary lining, the annular grounding steel bar 2 is the inner annular reinforcement of the tunnel secondary lining, the terminal 4 includes a connecting end 401 and a terminal head 402, the terminal head 402 fixes the corresponding grounding steel bar and is pre-buried in the tunnel secondary lining, the connecting end 401 extends to the inner wall of the tunnel and has a bolt hole, and during pouring, the end of the connecting end 401 contacts or extends out of the tunnel secondary lining inner formwork, or a wire box corresponding to the connecting end 401 is set on the tunnel secondary lining inner formwork for pouring the connecting end 401.

[0028] There are multiple terminal blocks 4 distributed on the inner wall of the tunnel. The grounding wire of the electrical equipment can be connected to the bolt hole of the terminal block 4 through a coil and a bolt, so as to achieve a connection effect. The terminal head 402 extends to the corresponding longitudinal grounding steel bar 3 or the annular grounding steel bar 2, and a bend of the longitudinal grounding steel bar 3 or the annular grounding steel bar 2 is set at a parallel connection. The terminal head 402 is fixed to the longitudinal grounding steel bar 3 or the annular grounding steel bar 2 by a clamp 8, so as to achieve clamping, without welding, reducing the difficulty of installation, and facilitating adjustment and installation according to actual needs.

[0029] The through ground wire 6 is connected to the corresponding analytical terminal extending into the cable trough 1 through a washer and a stainless steel connecting wire, and is fixed by bolts.

[0030] In an optional embodiment, a shaping piece is provided at the bending point of the inner bend 5, the inner bend 5 is welded and fixed to the shaping piece, and the shaping piece is installed at a preset angle for bending, thereby ensuring that the inner bend 5 extends along a preset path, and an outer groove corresponding to the annular grounding steel bar 2 is provided on the outer wall of the shaping piece, so that the annular grounding steel bar 2 can be formed, ensuring that the annular grounding steel bar 2 maintains a stable shape during construction, thereby improving installation accuracy.

[0031] The through ground wire 6 extends along one side corner of the cable trough 1 so as not to affect the installation of other cables. A cement mortar 7 for covering the through ground wire 6 and the terminal block 4 is provided in the cable trough 1. An insulating coating is applied to the outside of the cement mortar 7 to ensure that the grounding current will not affect the gas cable in the cable trough 1.

[0032] In this embodiment, a plurality of connection terminals 4 corresponding to the longitudinal grounding steel bars 3 or the annular grounding steel bars 2 are distributed at intervals inside the tunnel, so that additional electrical equipment in the tunnel can be connected.

[0033] In an optional embodiment, the line to be grounded is connected to the bolt hole of the connection end 401 through a wiring washer and a bolt, so as to be conducted to the ground wire through the grounding steel bar. The clamp 8 is a C-shaped metal plate, which can be specifically a tin-plated steel plate to ensure corrosion resistance. The two ends of the clamp 8 extend outward in parallel at the opening of the clamp 8, and there is a certain distance between the two ends of the clamp 8, so that after tightening the two ends of the clamp 8, the opening of the C-shaped metal plate can be narrowed, thereby holding the corresponding steel bar. One end of the clamp 8 is welded and fixed to the terminal head 402, and the terminal head 402 is a galvanized steel bar. A gap is left between the terminal head 402 and the corresponding grounding steel bar for installing a locking stud 9. The locking stud 9 passes through the two ends of the clamp 8 and is connected to a locking nut to lock it to the corresponding longitudinal grounding steel bar 3 or annular grounding steel bar 2.

[0034] Furthermore, in order to ensure the installation strength, a bite portion 801 bent toward the longitudinal grounding steel bar 3 or the annular grounding steel bar 2 is provided on both sides of the clamp. The bite portion 801 is the same length as the C-shaped bent portion and is integrally formed with the clamp 8 or welded and fixed. The bite portion 801 is inclined at a certain angle to the longitudinal grounding steel bar 3 or the annular grounding steel bar 2. In the process of locking the clamp 8, the bite portion 801 is deformed and pressed against the grounding steel bar, thereby improving the locking ability. After locking, the inner wall of the clamp 8 is pressed against the grounding steel bar. A serrated bite tooth is provided on one side of the bite portion 801 corresponding to the longitudinal grounding steel bar 3 or the annular grounding steel bar 2, and the stability of the connection is improved by the bite tooth.

[0035] The thickness of the bite portion 801 is smaller than that of the main body of the clamp 8, and the bite portion 801 is located on one side of the outside, thereby ensuring that the main body of the clamp 8 can be deformed toward the outer shape under the action of the bite portion 801 so as to be closely attached to the grounded steel bar.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A tunnel cable grounding structure, characterized in that: include: A cable trough, which is arranged on both sides of the tunnel and extends along the extension direction of the tunnel, and a through ground wire extending along the length direction of the cable trough is arranged in the cable trough; Longitudinal grounding steel bars, a plurality of the longitudinal grounding steel bars are evenly distributed in the tunnel circumferential direction, a plurality of equidistantly distributed circumferential grounding steel bars are provided in the tunnel extension direction, the longitudinal grounding steel bars and the circumferential grounding steel bars are electrically connected to form a grid-like guide net; A plurality of wiring terminals are distributed on the inner wall of the tunnel, and the wiring terminals include a connection end and a wiring head. The connection end extends to the inner wall of the tunnel and has a bolt hole. The line to be grounded is connected to the bolt hole of the connection end through a wiring washer and a bolt. The terminal head is parallel to the longitudinal grounding steel bar or the annular grounding steel bar by bending, and the terminal head and the longitudinal grounding steel bar or the annular grounding steel bar are fixed by a clamp.

2. The tunnel cable grounding structure according to claim 1, characterized in that: The annular grounding steel bar is provided with an L-shaped inner bend extending toward the middle of the tunnel at the tunnel arch foot, and the end of the inner bend extends upward inside the tunnel arch foot step. The through ground wire is electrically connected to the inner bend through a wiring terminal, and the inner wall of the tunnel arch foot step is provided with a wiring terminal electrically connected to the inner bend.

3. The tunnel cable grounding structure according to claim 2, characterized in that: A shaping piece is provided at the bending point of the inner bend, and the inner bend is fixed to the shaping piece by welding.

4. The tunnel cable grounding structure according to claim 1, characterized in that: The through ground wire extends along one side corner of the cable trough, and cement mortar for burying the through ground wire and the connection terminal is provided in the cable trough.

5. The tunnel cable grounding structure according to claim 1, characterized in that: The clamp is a C-shaped metal plate, and the two ends of the clamp extend outward in parallel at the opening of the clamp. One end of the clamp is welded and fixed to the terminal head. The locking stud passes through the two ends of the clamp and is connected to the locking nut to lock it to the corresponding longitudinal grounding steel bar or the annular grounding steel bar.

6. The tunnel cable grounding structure according to claim 5, characterized in that: The clamp has bite portions on both sides thereof which are bent toward the longitudinal grounding steel bars or the annular grounding steel bars. The bite portions are inclined at a certain angle to the longitudinal grounding steel bars or the annular grounding steel bars. Sawtooth bite teeth are provided on one side of the bite portion corresponding to the longitudinal grounding steel bars or the annular grounding steel bars.

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