Rapid composite grounding method for mobile communication base station
By constructing a three-level classification index system and using a grounding structure made of graphene material, the problem of long evaluation cycle for base station grounding networks has been solved, enabling rapid construction and effective grounding in areas with high soil resistivity, reducing construction workload and cycle, and providing reliable grounding protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA TOWER CO LTD
- Filing Date
- 2026-01-23
- Publication Date
- 2026-05-15
AI Technical Summary
Existing base station grounding schemes have long evaluation cycles, making it difficult to meet the needs of rapid base station construction. Furthermore, traditional materials do not perform well in grounding areas with high soil resistivity.
A three-level classification index system was constructed, which combined soil resistivity, geological type and supporting equipment requirements to quickly determine the grounding grid type. Horizontal grounding grids and vertical grounding electrodes made of graphene materials were adopted to meet the grounding needs of different regions.
It shortens the grounding grid type assessment cycle, meets the needs of rapid base station construction, and graphene materials exhibit excellent grounding performance in areas with high soil resistivity, reducing construction workload and cycle, while providing reliable joint grounding protection.
Smart Images
Figure CN122054005A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of communication technology, and in particular to a fast composite grounding method for mobile communication base stations. Background Technology
[0002] As a crucial component for ensuring the safe operation of mobile communication base station equipment and preventing lightning strikes and electromagnetic interference, the grounding performance of the base station grounding network directly affects the stability and security of the base station. For example, patent document CN220342409U discloses a base station grounding network, which includes a frame mesh and multiple support rods disposed on the frame mesh. The support rods are evenly distributed along the edge of the frame mesh and penetrate through it. A grounding wire is disposed on the frame mesh.
[0003] With the surge in the number of mobile communication base stations and the increasing complexity of site selection environments (covering various scenarios such as densely populated urban areas, suburbs, mountains, and wetlands), the current base station grounding network lacks a standard method that can quickly match complex scenarios and grounding strategies. It still requires a comprehensive geological survey and soil resistivity test of the base station site area before a grounding scheme can be formulated, which has a long evaluation cycle and is difficult to adapt to the needs of rapid base station construction. Summary of the Invention
[0004] Therefore, it is necessary to provide a fast composite grounding method for mobile communication base stations to address the technical problem that the long evaluation cycle of current base station grounding schemes affects the speed of base station construction.
[0005] The above objectives are achieved through the following technical solutions: A fast composite grounding method for mobile communication base stations includes the following steps: S1. Rapid assessment of base station ground network classification: S11. Basic Information Collection: In the selected site area of the base station, collect soil resistivity data and geological type, and at the same time collect the required parameters of supporting equipment. S12. Construct a three-level classification index system: the first-level index is the soil resistivity level, the second-level index is the geological type compatibility level, and the third-level index is the grounding requirement level of supporting equipment. S13. Determine the base station ground network type: Perform comprehensive scoring and calculation on the three-level classification indicators according to the preset scoring and weighting rules, and determine whether the base station ground network belongs to type A, type B or type C based on the total score. S2. Implementation of grounding scheme: If the base station ground network type is determined to be Type A, then a standard grounding structure is implemented, which is a horizontal grounding network; if the base station ground network type is determined to be Type B, then an enhanced grounding structure is implemented, which is a horizontal grounding network combined with multiple vertical grounding bodies; if the base station ground network type is determined to be Type C, then a composite grounding structure is implemented, which is a horizontal grounding network combined with a matrix of vertical grounding bodies.
[0006] Furthermore, the soil resistivity level is divided into low-resistivity, medium-resistivity, and high-resistivity zones, wherein... The low-resistivity zone is the area where the soil resistivity ρ ≤ 300 Ω·m; The medium-resistivity zone is the region where the soil resistivity satisfies 300Ω·m<ρ≤1000Ω·m; The high resistivity zone is the region where the soil resistivity ρ > 1000 Ω·m; Furthermore, the scores for the low-resistance region, medium-resistance region, and high-resistance region were 30, 60, and 90 points, respectively.
[0007] Furthermore, the geological type suitability level is divided according to the construction difficulty of the site selection area, namely easy construction type, relatively difficult construction type and difficult construction type, and the scores for easy construction type, relatively difficult construction type and difficult construction type are 30 points, 60 points and 90 points respectively.
[0008] Furthermore, the grounding requirement level of the supporting equipment is divided into low requirement, medium requirement and high requirement according to the type and parameters of the supporting equipment, and the scores for low requirement, medium requirement and high requirement are 30 points, 60 points and 90 points respectively.
[0009] Furthermore, the scores for soil resistivity level, geological type compatibility level, and grounding requirement level of supporting equipment are assigned weights of 0.4, 0.3, and 0.3, respectively. Then, a comprehensive score is calculated. A total score ≤ 30 points corresponds to type A, 30 points < total score ≤ 60 points corresponds to type B, and a total score > 60 points corresponds to type C.
[0010] Furthermore, the horizontal grounding grid is laid using graphene grounding conductors.
[0011] Furthermore, the mobile communication base station includes a tower and an equipment room, and the horizontal grounding grid includes two connected rectangular grounding grids, which are located below the tower and the equipment room, respectively.
[0012] Furthermore, the vertical grounding electrode is a graphene composite grounding electrode with a graphene conductive coating on its surface.
[0013] Furthermore, in the enhanced grounding structure, multiple vertical grounding electrodes correspond to the four right-angle positions of each rectangular grounding grid.
[0014] Furthermore, in the composite grounding structure, multiple vertical grounding electrodes are evenly distributed at the bottom of each rectangular grounding grid, and two of the vertical grounding electrodes are located directly below the iron tower.
[0015] The beneficial effects of this invention are: The present invention provides, firstly, the rapid determination of ground network type by constructing a three-level classification index system that includes soil resistivity, geological type, and supporting equipment requirements, thereby shortening the evaluation cycle and meeting the needs of rapid base station construction.
[0016] Secondly, applying graphene materials to the horizontal grounding grid and vertical grounding electrode of base stations can meet the grounding resistance requirements of areas with high soil resistivity (such as mountainous and arid areas). At the same time, compared with the vertical grounding electrode of traditional materials (such as galvanized steel pipes, angle steel, etc.), it can reduce the amount of laying and the construction period. Attached Figure Description
[0017] Figure 1 A flowchart of a fast composite grounding method for mobile communication base stations provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the horizontal grounding network used in a fast composite grounding method for mobile communication base stations according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a driven vertical grounding electrode provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a vertical grounding electrode for drilling construction provided in an embodiment of the present invention.
[0018] in: 100. Tower foundation; 200. Graphene grounding lead; 300. Horizontal grounding grid; 400. Graphene composite grounding electrode; 500. Connector; 600. Calcined petroleum coke. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.
[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0022] like Figures 1 to 4 As shown, an embodiment of the present invention provides a fast composite grounding method for mobile communication base stations, comprising the following steps: S1. Rapid assessment of base station ground network classification: S11. Basic Information Collection: In the selected site area of the base station, collect soil resistivity data and geological type, and at the same time collect the required parameters of supporting equipment. S12. Construct a three-level classification index system: the first-level index is the soil resistivity level, the second-level index is the geological type compatibility level, and the third-level index is the grounding requirement level of supporting equipment. S13. Determine the base station ground network type: Perform comprehensive scoring and calculation on the three-level classification indicators according to the preset scoring and weighting rules, and determine whether the base station ground network belongs to type A, type B or type C based on the total score. S2. Implementation of grounding scheme: If the base station grounding network type is determined to be Type A, then a standard grounding structure is implemented, which is a horizontal grounding network of 300. If the base station grounding network type is determined to be Type B, then an enhanced grounding structure is implemented, which is a horizontal grounding network of 300 combined with multiple vertical grounding electrodes. If the base station grounding network type is determined to be Type C, then a composite grounding structure is implemented, which is a horizontal grounding network of 300 combined with a vertical grounding electrode matrix.
[0023] Specifically, using a portable soil resistivity tester, 3 to 5 representative test points are selected within the site selection area of the base station. At each test point, the soil resistivity at different depths (1m, 3m, 5m) is measured using the four-electrode method, and the test data is recorded. At the same time, the geological type (such as cohesive soil, sandy soil, rock, wetland, etc.), surrounding environment (such as whether it is close to water sources, high-voltage lines, metal structures, etc.), base station type (such as macro base station, micro base station), and supporting equipment parameters (such as tower height, whether there is a dedicated transformer, and equipment room area) of the site selection area of the base station are collected.
[0024] Furthermore, the soil resistivity level is divided into low-resistivity, medium-resistivity, and high-resistivity zones, wherein... The low-resistivity zone is the area where the soil resistivity ρ ≤ 300 Ω·m; The medium-resistivity zone is the region where the soil resistivity satisfies 300Ω·m<ρ≤1000Ω·m; The high resistivity zone is the region where the soil resistivity ρ > 1000 Ω·m; Furthermore, the scores for the low-resistance region, medium-resistance region, and high-resistance region were 30, 60, and 90 points, respectively.
[0025] Specifically, the average soil resistivity of each base station site area is used to classify the soil resistivity level.
[0026] Furthermore, the geological type suitability level is divided according to the construction difficulty of the site selection area, namely easy construction type, relatively difficult construction type and difficult construction type, and the scores for easy construction type, relatively difficult construction type and difficult construction type are 30 points, 60 points and 90 points respectively.
[0027] The construction difficulty is related to the geological type. Specifically, the easy-to-construct geological types are mainly cohesive soil and sandy soil, the relatively difficult-to-construct geological types are mainly gravelly soil and weathered rock, and the most difficult-to-construct geological types are mainly relatively intact rock.
[0028] Furthermore, the grounding requirement level of the supporting equipment is divided into low requirement, medium requirement and high requirement according to the type and parameters of the supporting equipment, and the scores for low requirement, medium requirement and high requirement are 30 points, 60 points and 90 points respectively.
[0029] The types of supporting equipment include towers, dedicated transformers, equipment rooms, and sensitive and important communication equipment. Specifically, based on the height of the base station tower (≤30m, 30m < height ≤ 50m, > 50m), whether there is a dedicated transformer and equipment room, and whether it contains sensitive and important communication equipment, it is divided into low demand, medium demand, and high demand, and the determination rules are as follows: High demand: When the tower height is greater than 50m and meets any of the following conditions: (1) Equipped with a dedicated transformer and a machine room; (2) The computer room contains sensitive and important communication equipment.
[0030] Medium demand: When the high demand condition is not met, and the tower height is 30m < height ≤ 50m, and any of the following conditions are met: (1) Equipped with a dedicated transformer and a machine room; (2) The computer room contains sensitive and important communication equipment.
[0031] Low demand: When the tower height is ≤30m, and there is no dedicated transformer, no computer room, and no sensitive or important communication equipment in the computer room.
[0032] Furthermore, the scores for soil resistivity level, geological type compatibility level, and grounding requirement level of supporting equipment are assigned weights of 0.4, 0.3, and 0.3, respectively. Then, a comprehensive score is calculated. A total score ≤ 30 points corresponds to type A, 30 points < total score ≤ 60 points corresponds to type B, and a total score > 60 points corresponds to type C.
[0033] Specifically, using the fuzzy comprehensive evaluation method, base stations in low-resistivity, easy-to-construct, and low-demand areas are classified as Type A if their comprehensive score is ≤30. Base stations in medium-resistivity, relatively difficult-to-construct, and medium-demand areas are classified as Type B if their comprehensive score is 30 < ≤ 60. Base stations in high-resistivity, difficult-to-construct, and high-demand areas are classified as Type C if their comprehensive score is > 60.
[0034] Furthermore, the horizontal grounding grid 300 is laid using graphene grounding conductors. Specifically, the cross-sectional area of the graphene grounding conductors is not less than 120 mm². 2 .
[0035] Furthermore, the mobile communication base station includes a tower and a computer room, and the horizontal grounding grid 300 includes two connected rectangular grounding grids, which are located below the tower and the computer room, respectively. Specifically, the size of the rectangular grounding grids ensures that the tower foundation 100, the transformer foundation, and the computer room foundation are all within the range of the horizontal grounding grid 300, and the burial depth of the rectangular grounding grids is not less than 0.7m.
[0036] The connections between each supporting device and the horizontal grounding grid 300 are as follows: Iron tower: consisting of 4 cross-sectional sections with a minimum cross-sectional area of 120mm² 2 The graphene grounding conductor reliably connects the four right-angled positions at the bottom of the tower to the horizontal grounding grid 300. The connection points are made by exothermic welding or by connecting piece 500 to ensure that the contact resistance is ≤0.01Ω.
[0037] Specialized transformers: The transformer casing, core, and low-voltage side neutral point are connected by two cross-sectional areas of not less than 120mm². 2The graphene grounding wires are connected to different positions of the horizontal grounding grid 300 to form a double-point repeated grounding, and the length of the transformer grounding lead is ≤10m to avoid excessive lead inductance.
[0038] Computer room: Grounding trunk lines shall be installed around the perimeter of the computer room exterior walls. The grounding trunk lines shall have a cross-sectional area of not less than 120 mm². 2 The graphene grounding conductor is connected to the horizontal grounding grid 300 through no less than 4 connection points.
[0039] Furthermore, the vertical grounding electrode is a graphene composite grounding electrode 400, the surface of which is coated with a graphene conductive coating. This graphene composite grounding electrode 400 has the characteristics of low resistivity, corrosion resistance, and convenient construction.
[0040] Furthermore, in the enhanced grounding structure, multiple vertical grounding electrodes correspond to the four right-angle positions of each rectangular grounding grid.
[0041] Furthermore, in the composite grounding structure, multiple vertical grounding electrodes are evenly distributed at the bottom of each rectangular grounding grid, and two of the vertical grounding electrodes are located directly below the iron tower.
[0042] Among them, S2, the grounding scheme is implemented as follows: For low-resistance, easy-to-construct, and low-demand Type A base station grounding networks, there is generally no need to lay additional graphene vertical grounding bodies; a horizontal grounding network of 300 mm is sufficient to meet the requirement of grounding resistance ≤10Ω.
[0043] For the B-type base station grounding network, which is characterized by medium resistance, difficult construction, and medium demand, a graphene composite grounding electrode 400 with a length of 5m to 10m is vertically driven into each of the four right-angle positions of the horizontal grounding network 300. The top of the graphene composite grounding electrode 400 is connected to the horizontal grounding network 300 by exothermic welding or connector 500. If the tested grounding resistance is still greater than 10Ω, a graphene vertical grounding electrode can be added at the midpoint of the side of the horizontal grounding network 300. Each additional graphene electrode can reduce the grounding resistance by 8% to 12% until the requirements are met.
[0044] For C-type base station grounding networks in high-resistivity, difficult-to-construct, and high-demand areas, firstly, drive one 5m-10m long graphene vertical grounding electrode at each of the eight evenly distributed points (4 corner points + 4 midpoints) of the horizontal grounding network 300. Secondly, directly below the tower foundation 100, drive two more graphene vertical grounding electrodes to form a concentrated grounding electrode. The distance between the two grounding electrodes should not be less than 5m, and they should be connected to the horizontal grounding network 300 through graphene grounding conductors. Finally, if the soil resistivity is extremely high (ρ > 2000Ω·m), calcined petroleum coke 600 can be filled within a 30cm radius around the grounding electrodes. The calcined petroleum coke 600 should be evenly mixed with the soil to further reduce contact resistance. At the same time, ion grounding devices should be installed at the transformer and tower locations to ensure that the grounding resistance is ≤ 4Ω. If there is a water source or low-resistivity area within a 40m radius, the horizontal grounding network 300 can be extended to the edge of the water source to further reduce the grounding resistance.
[0045] The implementation process of this invention is as follows: Example 1: Suburban Macro Base Station (Type B Ground Network) 1. Basic Information Collection The average soil resistivity of the test area is 580Ω・m (medium resistivity zone), the geological type is sandy soil (easy to construct), the base station tower height is 40m, there is no dedicated transformer, the equipment room contains ordinary communication equipment (medium demand), the overall score is 45 points, and it is judged as a type B ground network.
[0046] 2. Grounding Implementation Plan Horizontal grounding grid 300: Uses graphene grounding conductors with a diameter of 13mm and a burial depth of 0.7m.
[0047] Graphene vertical grounding electrode: At each of the four right-angle positions of the horizontal grounding grid 300, a graphene composite grounding electrode 400 with a length of 6m (outer diameter of 16mm) is driven in. The top of the grounding electrode is connected to the horizontal grounding grid 300 by a connector 500.
[0048] Joint grounding connection: The tower is connected to the horizontal grounding network 300 through four 13mm diameter graphene grounding leads 200; the computer room grounding trunk line uses 13mm diameter graphene grounding conductors, with four connection points connected to the horizontal grounding network 300.
[0049] Example 2: Mountain Micro Base Station (Type C Ground Network) 1. Basic Information Collection The average soil resistivity of the test area is 1200Ω・m (high resistivity area), the geological type is weathered rock (difficult to construct), the base station tower is 25m high, there is a dedicated transformer, and the equipment room contains sensitive communication equipment (high demand). The overall score is 75 points, and it is judged to be a type C ground network.
[0050] 2. Grounding Implementation Plan Horizontal grounding grid 300: 13mm diameter graphene grounding conductors are used, buried at a depth of 0.7m, and small crushing equipment is used to assist in trench excavation.
[0051] Graphene Vertical Grounding Electrode Array: At 12 evenly distributed points on the horizontal grounding grid 300, one 6m long graphene composite grounding electrode 400 (outer diameter 50mm) is driven into each point via drilling. Directly below the tower foundation 100, two 6m long graphene composite grounding electrodes 400 are driven in, spaced 8m apart. The tops of the graphene composite grounding electrodes 400 are connected to the horizontal grounding grid 300 via connectors 500. Calcined petroleum coke 600 is filled within a 30cm radius around the graphene composite grounding electrode. Ion grounding devices are installed at the transformer and tower locations. If there is a low soil resistivity area 25m from the base station, four 6m long graphene composite grounding electrodes 400 (outer diameter 16mm) are installed in this area and connected to the horizontal grounding grid 300 via graphene grounding conductors, ensuring a grounding resistance ≤4Ω.
[0052] The evaluation cycle of the rapid evaluation method for base station ground network classification is 0.5 days, and the construction cycle of the overall grounding project is 0.5 to 1 day.
[0053] By constructing a three-level classification index system that includes soil resistivity, geological type, and supporting equipment requirements, the grounding grid type can be quickly determined, thereby shortening the evaluation cycle and meeting the needs of rapid base station construction. Furthermore, this invention applies graphene materials to the horizontal grounding grid 300 and vertical grounding electrodes of base stations, which can meet the grounding resistance requirements in areas with high soil resistivity (such as mountainous and arid regions). At the same time, compared to vertical grounding electrodes made of traditional materials (such as galvanized steel pipes and angle steel), it can reduce the amount of laying work and the construction period.
[0054] In addition, this invention connects the tower, the dedicated transformer and the machine room to the horizontal grounding grid to achieve joint grounding protection, which makes it less likely to form a potential difference and less likely to cause damage to the supporting equipment during lightning strikes or power grid fluctuations, thus achieving reliable joint grounding protection.
[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0056] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.
Claims
1. A fast composite grounding method for mobile communication base stations, characterized in that, Includes the following steps: S1. Rapid assessment of base station ground network classification: S11. Basic Information Collection: In the selected site area of the base station, collect soil resistivity data and geological type, and at the same time collect the required parameters of supporting equipment. S12. Construct a three-level classification index system: the first-level index is the soil resistivity level, the second-level index is the geological type compatibility level, and the third-level index is the grounding requirement level of supporting equipment. S13. Determine the base station ground network type: Perform comprehensive scoring and calculation on the three-level classification indicators according to the preset scoring and weighting rules, and determine whether the base station ground network belongs to type A, type B or type C based on the total score. S2. Implementation of grounding scheme: If the base station ground network type is determined to be Type A, then a standard grounding structure is implemented, which is a horizontal grounding network; if the base station ground network type is determined to be Type B, then an enhanced grounding structure is implemented, which is a horizontal grounding network combined with multiple vertical grounding bodies; if the base station ground network type is determined to be Type C, then a composite grounding structure is implemented, which is a horizontal grounding network combined with a matrix of vertical grounding bodies.
2. The fast composite grounding method for mobile communication base stations according to claim 1, characterized in that, The soil resistivity levels are divided into low-resistivity, medium-resistivity, and high-resistivity zones, among which... The low-resistivity zone is the area where the soil resistivity ρ ≤ 300 Ω·m; The medium-resistivity zone is the region where the soil resistivity satisfies 300Ω·m<ρ≤1000Ω·m; The high resistivity zone is the region where the soil resistivity ρ > 1000 Ω·m; Furthermore, the scores for the low-resistance region, medium-resistance region, and high-resistance region were 30, 60, and 90 points, respectively.
3. The fast composite grounding method for mobile communication base stations according to claim 2, characterized in that, The geological type suitability level is divided according to the construction difficulty of the site selection area, namely easy construction type, relatively difficult construction type and difficult construction type, and the scores for easy construction type, relatively difficult construction type and difficult construction type are 30 points, 60 points and 90 points respectively.
4. The fast composite grounding method for mobile communication base stations according to claim 3, characterized in that, The grounding requirements of the supporting equipment are divided into low, medium and high requirements according to the type and parameters of the supporting equipment, and the scores for low, medium and high requirements are 30 points, 60 points and 90 points respectively.
5. The fast composite grounding method for mobile communication base stations according to claim 4, characterized in that, The scores for soil resistivity level, geological type compatibility level, and grounding requirement level of supporting equipment are assigned weights of 0.4, 0.3, and 0.3, respectively. Then, a comprehensive score is calculated. A total score of ≤30 points corresponds to type A, 30 points < total score ≤60 points corresponds to type B, and a total score >60 points corresponds to type C.
6. The fast composite grounding method for mobile communication base stations according to claim 1, characterized in that, The horizontal grounding grid is laid using graphene grounding conductors.
7. The fast composite grounding method for mobile communication base stations according to claim 6, characterized in that, The mobile communication base station includes a tower and a computer room, and the horizontal grounding grid includes two connected rectangular grounding grids, which are located below the tower and the computer room, respectively.
8. The fast composite grounding method for mobile communication base stations according to claim 7, characterized in that, The vertical grounding electrode is a graphene composite grounding electrode with a graphene conductive coating on its surface.
9. The fast composite grounding method for mobile communication base stations according to claim 8, characterized in that, In the enhanced grounding structure, multiple vertical grounding electrodes correspond to the four right-angle positions of each rectangular grounding grid.
10. The fast composite grounding method for mobile communication base stations according to claim 8, characterized in that, In the composite grounding structure, multiple vertical grounding electrodes are evenly distributed at the bottom of each rectangular grounding grid, and two of the vertical grounding electrodes are located directly below the iron tower.