Ultralow-resistance grounding system for shielding high-frequency signals in underground space
By arranging circumferential and longitudinal grounding wires, rock mass support anchors and grounding electrodes in underground space tunnels, a space grounding network and a resistance-reducing agent filling layer are formed, which solves the problem that the existing grounding system cannot shield high-frequency signals and obtain ultra-low To solve the problem of ground resistance, an ultra-low resistance grounding system of less than 1Ω has been realized.
Patent Information
- Application Number
- CN202420125184.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-18
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-01-18
AI Technical Summary
The existing grounding system cannot meet the special requirements of electronic grounding of underground space scientific experimental devices, and cannot effectively shield high-frequency signals and obtain ultra-low grounding resistance.
Using spatial multi-dimensional integrated grounding technology, circumferential and longitudinal grounding lines are set up on the rock wall and ground of the underground space tunnel, combined with rock mass support anchors and grounding electrodes, to form a space grounding network and a filling layer of resistance reducing agent, which is dispersed It can go deep into the rock formation at multiple points to reduce the grounding resistance.
It effectively eliminates high-frequency signal interference and provides an electronic grounding system with an ultra-low resistance value of less than 1Ω for scientific experimental equipment to meet the special requirements of underground space scientific experiments.
Smart Images
Figure CN222380856U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of underground space scientific experiment electronics grounding, and specifically relates to an ultra-low resistance grounding system for shielding high-frequency signals in an underground space. Background Art
[0002] Since dark matter is difficult to detect, it is necessary to eliminate the interference of various rays in the universe. It is only possible to detect it directly in the deep underground. Underground laboratories are generally located deep in the rock layer with a thickness of more than 2,000 meters. The cosmic ray radiation value in the underground space is only one billionth of that on the surface, which is an excellent place to conduct cutting-edge scientific research such as dark matter detection. However, the surroundings of deep underground space are made of rocks, which have very high impedance compared to ordinary soil. The precision detectors for dark matter detection require excellent electronic grounding to shield high-frequency interference signals and obtain ultra-low grounding resistance.
[0003] Conventional power system grounding mainly connects the neutral point or exposed conductive parts of the electrical device to the grounding grid buried in the earth's soil through a conductor to eliminate unbalanced current. However, for the electronic grounding of the detector system, it is not possible to obtain ultra-low grounding resistance and shield high-frequency interference signals by simply burying a grounding grid in the soil. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide an ultra-low resistance grounding system for shielding high-frequency signals in underground space, solve the problem that the existing grounding system cannot meet the special requirements of electronic grounding of underground space scientific experimental equipment, and provide an electronic grounding system for scientific experimental equipment that eliminates the influence of high-frequency signals and has an ultra-low resistance value of less than 1Ω.
[0005] According to the technical scheme of the utility model, the utility model provides an ultra-low resistance grounding system for shielding high-frequency signals in an underground space, wherein a ring-shaped grounding wire is arranged on the rock wall and the ground of the underground space tunnel, and a plurality of the ring-shaped grounding wires are arranged along the length direction of the tunnel; rock support anchor rods are arranged on the rock wall, and the ring-shaped grounding wires are connected to the rock support anchor rods; longitudinal grounding wires are arranged on both sides of the ground along the length direction of the tunnel, and the longitudinal grounding wires are connected to the ring-shaped grounding wires to form a space grounding grid; vertical boreholes are also arranged on both sides of the ground, and grounding electrodes are arranged in the boreholes, and a resistance reducing agent filling layer is arranged between the grounding electrode and the inner wall of the borehole, and the upper part of the grounding electrode is connected to the space grounding grid; a concrete layer is arranged on the inner side of the rock wall and the ground; a grounding terminal is also arranged on the rock wall and / or the ground, one end of the grounding terminal is connected to the space grounding grid, and the other end of the grounding terminal is exposed in the tunnel.
[0006] Furthermore, a rock protection steel mesh is arranged in the concrete layer, and the rock protection steel mesh is connected to the rock support anchor rod.
[0007] Furthermore, the grounding terminals are arranged on the rock wall and distributed along the length direction of the tunnel; adjacent grounding terminals are connected via inter-terminal connectors.
[0008] Furthermore, the grounding terminal includes a pre-embedded fixing card, one end of which extends into the rock wall for fixing, and the other end of which extends out of the concrete layer and is provided with a device connection end.
[0009] Furthermore, the embedded fixing card and / or the terminal connecting piece are connected to the space grounding grid.
[0010] Furthermore, the embedded fixing card is a steel plate structure, the exposed end of the embedded fixing card is bent along the rock wall and is provided with a through hole at the end; the equipment connection end is a bolt, the bolt is inserted into the through hole of the embedded fixing card, and the screw rod of the bolt faces the inside of the tunnel; a nut and a washer are sleeved on the screw rod of the bolt, and the washer is located between the nut and the embedded fixing card.
[0011] Furthermore, a concrete filling portion is provided at the top of the drill hole, and the upper surface of the concrete filling portion is flush with the upper surface of the concrete layer on the ground.
[0012] Furthermore, the annular grounding wire and / or the longitudinal grounding wire are galvanized flat steel.
[0013] Furthermore, the grounding electrode is a copper-clad round steel, and the length of the grounding electrode and the depth of the drilled hole are not less than 3m.
[0014] Furthermore, in the length direction of the tunnel, the spacing between adjacent ring-shaped grounding wires is 30m to 50m, the spacing between adjacent grounding electrodes is 90m to 110m, and the spacing between adjacent grounding terminals is 10m to 30m.
[0015] Compared with the prior art, the beneficial technical effects of the utility model are as follows:
[0016] The utility model discloses an ultra-low resistance grounding system for shielding high-frequency signals in underground space, which adopts spatial multi-dimensional integrated grounding technology. Aiming at the special condition that the strata in underground space are composed of rock structure and have high impedance, the space grounding network, rock support anchor rods, grounding electrodes and other distributed multi-point deep-rock resistance reduction measures are formed, which can effectively eliminate high-frequency signal interference and provide an ultra-low resistance electronic grounding system for scientific experimental equipment. In addition, the scheme can also be applied to other similar underground space grounding situations. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a cross-sectional structural schematic diagram of an embodiment of the utility model.
[0018] Figure 2 yes Figure 1 A partial enlarged view of part A.
[0019] Description of reference numerals in the accompanying drawings:
[0020] 1. Rock wall; 2. Ground; 3. Annular grounding wire; 4. Rock support anchor rod; 5. Longitudinal grounding wire; 6. Drill hole; 7. Grounding electrode; 8. Resistance reduction agent filling layer; 9. Grounding terminal; 10. Concrete layer; 11. Rock protection steel mesh; 12. Terminal connector; 13. Embedded fixing card; 14. Bolt; 15. Nut; 16. Washer; 17. Concrete filling part. DETAILED DESCRIPTION
[0021] The utility model provides an ultra-low resistance grounding system for shielding high-frequency signals in an underground space, which solves the problem that the existing grounding system cannot meet the special requirements of electronic grounding of scientific experimental devices in underground space, and realizes providing an electronic grounding system for scientific experimental devices that eliminates the influence of high-frequency signals and has an ultra-low resistance value of less than 1Ω.
[0022] See also Figure 1 According to one embodiment of the utility model, an ultra-low resistance grounding system for shielding high-frequency signals in an underground space is provided. The underground space mainly includes a tunnel structure. An annular grounding wire 3 is provided on the rock wall 1 and the ground 2 of the underground space tunnel. The annular grounding wire 3 is annular and is provided along the edge contour of the tunnel cross section. A plurality of the annular grounding wires 3 are provided along the length direction of the tunnel. Rock support anchor rods 4 are provided on the rock wall 1. The rock support anchor rods 4 are radially provided and extend into the rock wall 1. A plurality / groups of rock support anchor rods 4 are provided in the length direction and annular (circumferential) direction of the rock wall 1. The annular grounding wires 3 are connected to the rock support anchor rods 4. Longitudinal grounding wires 5 are provided on both sides of the tunnel ground 2 along the length direction of the tunnel. Figure 1 The double-headed arrows shown in the figure mean that the longitudinal grounding wire 5 is set in front and behind the tunnel length direction perpendicular to the drawing surface, and is set continuously through the length. The longitudinal grounding wire 5 is connected to the annular grounding wire 3 to form a space grounding network. Vertical boreholes 6 are also set on both sides of the ground 2. There are multiple groups of boreholes 6 distributed in the length direction of the tunnel. A grounding electrode 7 is set in the borehole 6. A resistance reducing agent filling layer 8 is provided between the grounding electrode 7 and the inner wall of the borehole 6. The resistance reducing agent filling layer 8 is preferably a physical resistance reducing agent. The upper part of the grounding electrode 7 is connected to the space grounding network. A concrete layer 10 is covered on the inner side of the rock wall 1 and the ground 2 to provide structural strength and make the inner surface of the tunnel smooth and clean. A grounding terminal 9 is also provided on the rock wall 1 and / or the ground 2. One end of the grounding terminal 9 extends into the tunnel rock wall 1 and / or the ground 2 and is connected to the space grounding network. The other end of the grounding terminal 9 is exposed in the tunnel as a grounding connection point for scientific experimental devices.
[0023] It should be noted that some of the "connection" relationships described in the present invention are, for example, conductive connections such as welding, and grounding wires, anchor rods, grounding electrodes, grounding terminals, etc. are all made of conductive materials such as steel, thereby forming an overall connected three-dimensional structure similar to a Faraday cage, which can achieve the required shielding and grounding effects. These related contents are clear based on the structure of this scheme and common sense in the field.
[0024] In a specific embodiment, the annular grounding wire 3 is preferably a galvanized flat steel; in the longitudinal direction of the tunnel, the spacing between adjacent annular grounding wires 3 is 30m to 50m (for example, about 40m), in other words, a circle of annular grounding wires is set every about 40m along the tunnel. The annular grounding wire 3 is laid in the concrete layer 10 of the rock wall 1, and the annular grounding wire 3 is welded to the rock support anchor 4 (the rod body of the anchor is, for example, a steel bar).
[0025] A rock protection steel mesh 11 is also provided in the concrete layer 10. The rock protection steel mesh 11 is a steel mesh with one or more layers provided along the rock wall 1. The rock support anchor rod 4 passes through the gap / mesh of the rock protection steel mesh 11 and penetrates into the rock mass of the tunnel. The rock protection steel mesh 11 is welded and connected to the rock support anchor rod 4. The rock support anchor rod 4 and the rock protection steel mesh 11 serve as the anchoring system of the tunnel, and work together with the surface concrete layer 10 of the rock mass to ensure the structural safety of the tunnel. At the same time, the rock support anchor rod 4 and the rock protection steel mesh 11 can play the role of a natural grounding body.
[0026] The longitudinal grounding wire 5 is preferably a galvanized flat steel; it is longitudinally arranged along both sides of the tunnel and near the side rock wall 1, and is laid in the concrete layer 10 of the ground 2 (road surface). The longitudinal grounding wire 5 is connected to the annular grounding wire 3 at multiple points. More specifically, each annular grounding wire 3 and each longitudinal grounding wire 5 are welded at the intersection, forming a cage-shaped space grounding network arranged along the tunnel wall.
[0027] The grounding electrode 7 is preferably made of copper-clad round steel, and the length of the grounding electrode 7 and the depth of the borehole 6 are not less than 3m. In the length direction of the tunnel, the spacing between adjacent grounding electrodes 7 is 90m to 110m (for example, about 100m). In other words, along both sides of the tunnel, one / a group of grounding electrodes 7 is set every approximately 100m perpendicular to the road surface. The grounding electrode 7 uses a copper-clad round steel of about 3m in length and penetrates into the borehole 6 in the rock formation. A resistance reducing agent filling layer 8 is provided between the grounding electrode 7 and the bottom, side wall and top of the borehole 6. The grounding electrode 7 can be welded to the annular grounding wire 3 and / or the longitudinal grounding wire 5. For example, the position of the borehole 6 can be adjacent to the position of the longitudinal grounding wire 5, and the grounding electrode 7 is welded to the longitudinal grounding wire 5; thereby forming a high-frequency signal shielding system. Please also refer to Figure 2A concrete filling portion 17 is cast on the top of the borehole 6, and the upper surface of the concrete filling portion 17 is flush with the upper surface of the concrete layer 10 on the ground 2 to form a flat road surface.
[0028] In the longitudinal direction of the tunnel, the spacing between adjacent grounding terminals 9 is preferably 10m to 30m. For example, along both sides of the tunnel, one or a group of grounding terminals 9 is connected every 20m. Figure 2 , the grounding terminal 9 is arranged on the rock wall 1 and is distributed along the length direction of the tunnel. Adjacent grounding terminals 9 are connected by terminal connectors 12, and the terminal connectors 12 are, for example, flat steel, which is welded to the grounding terminal 9. The grounding terminal 9 includes a pre-embedded fixing card 13, which mainly plays the role of fixing the buried wiring terminal 9 in the rock wall. Its structure can be selected from flat steel, steel plate, steel bar, etc. One end of the pre-embedded fixing card 13 is inserted into the rock wall 1 for fixing, and the other end of the pre-embedded fixing card 13 extends out of the concrete layer 10 and is provided with a device connection end. The pre-embedded fixing card 13 and / or the terminal connector 12 are connected to the space grounding grid, so that the device connection end is connected to the space grounding grid. Electrical devices such as detectors in the underground space are connected to the device connection end to achieve grounding.
[0029] For example, in one embodiment, the embedded fixing card 13 is a steel plate structure, and the exposed end of the embedded fixing card 13 is bent along the rock wall 1 and is provided with a through hole at the end. The equipment connection end is the screw end of the bolt 14, and the bolt 14 is inserted into the through hole at the end of the embedded fixing card 13, and the screw of the bolt 14 faces the inside of the tunnel. The screw of the bolt 14 is sleeved with a nut 15 and a washer 16, and the washer 16 is located between the nut 15 and the embedded fixing card 13, so as to ensure the installation and fixation of the bolt 14. The terminal connector 12 is a flat steel, and the terminal connector 12 is arranged between the bent section of the embedded fixing card 13 and the rock wall 1, so as to conductively connect the adjacent embedded fixing cards 13; a part of the embedded fixing card 13 is located adjacent to the annular grounding wire 3, and is welded to realize the connection between the bolt 14 and the space grounding grid. In other embodiments, unlike the aforementioned embodiments, the embedded fixing card 13 only plays a role in structural fixing, and a portion of the terminal connector 12 is located adjacent to the annular grounding wire 3 and is welded; for example, the terminal connector 12 is made of flat steel and welded to the annular grounding wire 3, the bolt 14 is relatively long, and only the end of the bolt 14 is exposed, and the rest of the grounding terminal 9 is covered in the concrete layer 10. It should be noted that the grounding terminal 9 can also adopt other structures as long as it can be connected to the space grounding grid, and the specific structure, setting method, position, etc. can be adjusted according to specific circumstances.
[0030] To sum up, the utility model provides an ultra-low resistance grounding system for shielding high-frequency signals in underground space, especially for the special condition that the strata in underground space are made of rock and have high impedance. Through the formation of a spatial grounding network and distributed multi-point resistance reduction measures such as rock support anchors and grounding electrodes that penetrate deep into the rock strata, a spatial multi-dimensional integrated grounding system is formed, which can effectively eliminate high-frequency signal interference, and provide an electronic grounding system for the ultra-low resistance required by scientific experimental equipment and the elimination of high-frequency signal influence, achieving a grounding resistance value of less than 1Ω.
Claims
1. An ultra-low resistance grounding system for shielding high-frequency signals in underground space, characterized in that: An annular grounding wire (3) is arranged on the rock wall (1) and the ground (2) of an underground space tunnel, and a plurality of the annular grounding wires (3) are arranged along the length direction of the tunnel; rock support anchor rods (4) are arranged on the rock wall (1), and the annular grounding wire (3) is connected to the rock support anchor rods (4); longitudinal grounding wires (5) are arranged on both sides of the ground (2) along the length direction of the tunnel, and the longitudinal grounding wires (5) are connected to the annular grounding wires (3) to form a space grounding network; Vertical boreholes (6) are also provided on both sides of the ground (2), a grounding electrode (7) is provided in the borehole (6), a resistance reducing agent filling layer (8) is provided between the grounding electrode (7) and the inner wall of the borehole (6), and the upper part of the grounding electrode (7) is connected to the space grounding grid; A concrete layer (10) is provided on the inner side of the rock wall (1) and the ground (2); a grounding terminal (9) is also provided on the rock wall (1) and / or the ground (2), one end of the grounding terminal (9) is connected to the spatial grounding grid, and the other end of the grounding terminal (9) is exposed in the tunnel.
2. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to claim 1 is characterized in that: A rock protection steel mesh (11) is arranged in the concrete layer (10), and the rock protection steel mesh (11) is connected to the rock support anchor rod (4).
3. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to claim 1 is characterized in that: The grounding terminals (9) are arranged on the rock wall (1) and are distributed along the length direction of the tunnel; adjacent grounding terminals (9) are connected via inter-terminal connectors (12).
4. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to claim 3 is characterized in that: The grounding terminal (9) comprises a pre-embedded fixing card (13), one end of the pre-embedded fixing card (13) extends into the rock wall (1) for fixing, and the other end of the pre-embedded fixing card (13) extends out of the concrete layer (10) and is provided with a device connection end.
5. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to claim 4 is characterized in that: The pre-buried fixing card (13) and / or the inter-terminal connecting piece (12) are connected to the spatial grounding grid.
6. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to claim 4, characterized in that: The embedded fixing card (13) is a steel plate-shaped structure. The exposed end of the embedded fixing card (13) is bent along the rock wall (1) and is provided with a through hole at the end. The equipment connection end is a bolt (14). The bolt (14) is inserted into the through hole of the embedded fixing card (13). The screw rod of the bolt (14) faces the inside of the tunnel. A nut (15) and a washer (16) are sleeved on the screw rod of the bolt (14). The washer (16) is located between the nut (15) and the embedded fixing card (13).
7. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to claim 1, characterized in that: A concrete filling portion (17) is provided at the top of the drill hole (6), and the upper surface of the concrete filling portion (17) is flush with the upper surface of the concrete layer (10) on the ground (2).
8. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to any one of claims 1 to 7, characterized in that: The annular grounding wire (3) and / or the longitudinal grounding wire (5) are galvanized flat steel.
9. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to any one of claims 1 to 7, characterized in that: The grounding electrode (7) is a copper-clad round steel, and the length of the grounding electrode (7) and the depth of the drill hole (6) are both not less than 3 m.
10. The ultra-low resistance grounding system for shielding high-frequency signals in underground space according to any one of claims 1 to 7, characterized in that: In the longitudinal direction of the tunnel, the spacing between adjacent annular grounding wires (3) is 30m to 50m, the spacing between adjacent grounding electrodes (7) is 90m to 110m, and the spacing between adjacent grounding terminals (9) is 10m to 30m.