Communication signal house lightning protection grounding construction method based on BIM technology

Abstract

The invention provides a communication signal house lightning protection grounding construction method based on a BIM technology, and belongs to the technical field of house lightning protection grounding construction. S2, carrying out BIM construction deepening design; s3, grounding body construction; s4, laying a down lead; s5, constructing a lightning protection belt; s6, constructing a lightning protection network; s7, prefabricating components and accessories; s8, house shielding construction; and S9, grounding test acceptance. The invention can solve the problems that the lightning protection grounding construction method of the communication signal house needs a large amount of pre-burying work, the difficulty of later rectification is high, and the maintenance cost is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of lightning protection grounding construction of houses, and specifically discloses a lightning protection grounding construction method for communication signal houses based on BIM technology. Background Art

[0002] In the railway technology system, the quality of lightning protection and grounding of communication and signal system buildings directly affects the normal operation of the railway. The lightning protection and grounding system can protect key facilities such as railway signal systems, rail transit equipment and traffic control centers from the impact of lightning strikes, ensuring the safe and stable operation of these facilities. By designing and installing an effective grounding system, lightning can be introduced into the ground, reducing the impact of lightning on buildings and equipment, thereby reducing the risk of equipment damage and improving the reliability and safety of the system. The lightning protection and grounding system can eliminate static electricity and induced charges caused by electrified overhead lines, prevent overvoltage and induced voltage from damaging equipment, protect line communications and operations, effectively avoid the huge threat of lightning to equipment and operations, and improve the stability and safety of electrified railways.

[0003] However, the traditional lightning protection grounding construction method for communication signal houses has the following disadvantages:

[0004] A large amount of pre-embedded work is required, which makes subsequent rectification difficult and increases the cost of inspection and maintenance. Summary of the Invention

[0005] The present invention provides a lightning protection and grounding construction method for communication signal houses based on BIM technology, which solves the problem that the lightning protection and grounding construction method for communication signal houses requires a large amount of pre-embedding work, makes subsequent rectification difficult, and increases repair and maintenance costs.

[0006] The present invention provides a method for constructing lightning protection and grounding for communication signal buildings based on BIM technology, comprising the following steps:

[0007] S1, Construction Preparation: Collect lightning protection grounding diagrams, building construction drawings, technical standard documents, and clarify the goals;

[0008] S2, BIM Construction Design: Apply BIM technology to deepen the construction technology of key processes such as grounding bodies, lightning protection down conductors, roof lightning protection strips, lightning protection nets, grounding resistance test points, and house shielding. This involves forming a three-dimensional technical briefing, pre-planning hole locations, and rationally arranging steel bar layouts. The refined BIM construction model is then used to extract a detailed bill of quantities down to the component level, generating detailed lists of various assemblies to assist in submitting on-site material plans.

[0009] S3, grounding body construction: using concrete frame main reinforcement or reinforced steel bars for grounding body construction, using foundation and connecting beams for grounding body construction and grounding body installation;

[0010] S4, down conductor laying: carry out the grounding construction of the main reinforcement of the house and the construction of the four corners of the house respectively;

[0011] S5, Lightning protection belt construction: The lightning protection belt is laid along the parapet and ridge around the house using hot-dip galvanized round steel, and the lightning protection belt is welded to the grounding steel bars reserved for the main reinforcement of the house;

[0012] S6, Lightning protection network construction: The roofs of relay stations, repeaters, and communication base stations are laid out in a grid with hot-dip galvanized steel and connected to lightning protection strips at preset intervals;

[0013] S7, component prefabrication: Use BIM technology to plan the layout of the Faraday cage on the roof and side walls, pre-process the Faraday cage grid structure, and directly fix the grid structure to the wall;

[0014] S8, house shielding construction;

[0015] S9, grounding test acceptance.

[0016] In step S3, the concrete frame main bars or reinforcing steel bars are used as the grounding body for construction as follows: the main bars or reinforcing steel bars are welded together with steel bars of the same specifications to form a grid no larger than 5m×5m to ensure the continuity of the electrical connection, the main bars or reinforcing steel bars are welded together below the outdoor ground, and the two main bars or reinforcing steel bars are marked with colored paint.

[0017] In step S3, the construction of grounding body using foundation and connecting beam is specifically as follows: find the position of foundation group according to the size and position of design drawing, overlap and seal the reinforcement bars at the four corners of pile foundation of each group of foundation, and then weld them with at least 2 column main bars. Select 2 main bars in the hidden beam and use 12mm steel bar to weld on both sides for at least 80mm, forming a closed loop in the hidden beam, and weld the 2 main bars selected in the hidden beam to the embedded grounding connection plate below the outdoor ground, remove the coating, mark the two main bars with colored paint, and lead them out for at least 3m.

[0018] In step S3, the grounding body is installed as follows: the material, position, and welding quality of the grounding body should all comply with the construction specifications, and the grounding body resistance should be tested in a timely manner. When a natural grounding body is used, it should be tested after the bottom plate reinforcement is tied. If the grounding body resistance does not meet the design and specification requirements, an artificial grounding electrode should be added, and the grounding body resistance test should be recorded.

[0019] In step S4, the main reinforcement grounding construction of the house is specifically as follows: when the down conductor is grounded using the main reinforcement of the house, a 40mm×4mm hot-dip galvanized flat steel is reserved 1m below the ground to connect to the outdoor comprehensive grounding, and a vertical grounding electrode is set at the connection point. If two cross-sectional areas of not less than 16mm are used in the structural column of the house, 2The main reinforcement serves as the grounding steel bar. The upper end of the grounding steel bar is welded to the lightning protection strip, and the lower end is welded to the integrated grounding grid. The welding point between the down conductor and the lightning protection strip is treated with two coats of anti-rust paint and one coat of silver powder paint for anti-corrosion. The connection point with the outdoor integrated grounding is treated with two coats of asphalt paint for anti-corrosion.

[0020] In step S4, the construction of the four corners of the house is specifically as follows: pre-embed 12mm diameter hot-dip galvanized round steel at the four corner test points of the house, and the round steel is 500mm away from the outdoor floor.

[0021] In step S5, the lightning protection strip is laid along the parapet and ridge around the house using hot-dip galvanized round steel with a diameter of 12 mm. The lightning protection strip is supported by an adjustable bracket every 1 m. The adjustable bracket support is made of round steel of the same specification as the lightning protection strip. The height of the adjustable bracket support is 150±10 mm. No adjustable bracket support is set at the corner of the house. The lightning protection strip is welded to the reserved grounding steel bar of the main reinforcement of the house. After welding, the welding slag is knocked off and the welding point is checked. If it meets the requirements, it is painted with 2 coats of anti-rust paint and 1 coat of silver powder paint for anti-corrosion treatment.

[0022] In step S6, the roofs of the relay station, repeater station, and communication base station buildings are laid with 40mm×4mm hot-dip galvanized steel in a grid no larger than 3m×3m, and are connected to the lightning protection strip every 3m.

[0023] In step S8, the specific steps of house shielding construction are:

[0024] t1, first connection: Place the prefabricated Faraday cage grid structure on the wall, ceiling, ground or floor of the communication and signal equipment room, weld the steel bars of the main reinforcement grid and the tension reinforcement grid, and connect the interior wall doors and windows to the Faraday cage and the main reinforcement in the wall;

[0025] t2, Second connection: When constructing the wall Faraday cage shielding, set up 4 door and window type grounding terminals at the doors and windows. The reserved height of the grounding terminals on both sides is unified. The grounding terminals are welded to the Faraday cage grid structure with a welding length of not less than 100mm. The grounding terminals are set 30-60mm away from both sides of the reserved openings of the doors and windows. The lower end of the grounding terminal of the door is not less than 1.5m from the ground, and the upper end of the terminal is 0.4m from the top of the door frame. The grounding terminals of the windows are set 0.2m away from the bottom and top of the window frame. The Faraday cage grid structure corresponding to the window adopts a mesh diameter not greater than 80×80mm and a cross-section not less than 9mm 2 Aluminum alloy mesh, door and window connection line uses 10mm 2 Flame-retardant yellow-green two-color soft copper wire, with cold-pressed terminal lugs at both ends. One end is connected to the reserved grounding terminal on the wall shield, and the other end is bolted to the window shielding aluminum mesh and the door frame.

[0026] t3, the third connection: the brackets of the anti-static floor are reliably connected and cold-pressed or welded to the Faraday cage grid structure corresponding to the wall. The distance between the connection points should be no more than 5m, and the cross-section of the multi-strand insulated soft wire used for welding or bolting should be no less than 10mm 2 Alternatively, use δ0.2mm×20mm copper foil tape on the ground to form a grid that is the same as the anti-static floor grid. The intersections of the grids are welded or connected to the brackets. At the same time, an anti-static floor pedestal is installed at the cabinet base to support the anti-static floor.

[0027] t4, Lightning protection construction: The cable grounding busbars in the mechanical room working area, protective connection, power supply lightning protection, and cable introduction room are managed by color separation, the copper busbars and flat steel are connected by welding technology, and the grounding collection line is connected to the outdoor comprehensive ground network with 40×4mm hot-dip galvanized flat steel.

[0028] In step S9, all reserved grounding terminals are tested one by one to ensure that their grounding resistance values are lower than 1Ω and meet the design specifications.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. Apply BIM technology to build a three-dimensional model of lightning protection and grounding for base stations and relay stations. Optimize the reserved holes in the Faraday cage to avoid breakpoints in the Faraday cage. Use adjustable supports for lightning protection strips to ensure that the top surface of the lightning protection strips is on the same horizontal plane, reducing the probability of lightning strikes and evenly transmitting lightning currents. Replace the connection between the cable grounding copper busbar and the flat steel bolts with welding to increase the contact surface, making the connection more secure and comprehensively improving the quality of lightning protection and grounding construction.

[0031] 2. Apply BIM technology to simulate lightning protection and grounding construction, optimize steel bar layout, reasonably calculate steel bar length, reduce steel bar waste, form three-dimensional technical disclosure, reduce construction difficulty, improve efficiency, and reduce costs;

[0032] 3. Use Faraday cage prefabrication technology to prefabricate Faraday cages on the roof and surrounding walls of the building in advance to reduce on-site high-altitude operations, reduce on-site safety risks, and ensure fast construction progress and excellent quality;

[0033] 4. During the lightning protection grounding construction, the cable grounding copper busbars were color-coded and sealed with heat shrink tubing of different colors. This makes it easier to distinguish the types and functions of the lightning protection grounding copper busbars during later operation and maintenance. An electrostatic floor pedestal was installed on the base of the indoor cabinet to prevent the electrostatic floor from being damaged near the cabinet side, thereby increasing the service life of the electrostatic floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 This is a flowchart of the construction method of lightning protection and grounding for communication signal buildings based on BIM technology;

[0036] Figure 2 Flowchart for shielding construction for the house;

[0037] Figure 3 It is an overall deepening diagram of BIM technology;

[0038] Figure 4 This is the detailed drawing of the grounding body construction;

[0039] Figure 5 This is a construction diagram for laying down conductors;

[0040] Figure 6 Construction photos of down conductor laying;

[0041] Figure 7 This is a schematic diagram of the construction of the roof lightning protection strip;

[0042] Figure 8 The following are construction photos of the roof lightning protection strip;

[0043] Figure 9 This is the installation photo of the adjustable bracket I;

[0044] Figure 10 Photo Ⅱ shows the installation of the adjustable bracket;

[0045] Figure 11 The following are photos of the construction of the lightning protection net;

[0046] Figure 12 for Figure 11 Zoom in on a part of the photo;

[0047] Figure 13 This is a schematic diagram of the prefabrication of a Faraday cage;

[0048] Figure 14 This is the overall schematic diagram of the Faraday cage;

[0049] Figure 15 The following are construction photos of the wall Faraday cage;

[0050] Figure 16 Construction photos of the Faraday cage for the window;

[0051] Figure 17 Construction photos of lightning protection grounding;

[0052] Figure 18 These are construction photos of the electrostatic floor cap. DETAILED DESCRIPTION

[0053] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] See also Figure 1-18 The present invention provides a lightning protection and grounding construction method for a communication signal house based on BIM technology, which includes the following steps.

[0055] S1, Construction preparation: Collect lightning protection grounding diagrams, building construction drawings, technical standard documents, and clarify the goals.

[0056] S2, BIM construction deepening design: Apply BIM technology to deepen the construction technology of key processes such as grounding bodies, lightning protection down conductors, roof lightning protection strips, lightning protection nets, grounding resistance test points, and house shielding, form a three-dimensional technical briefing, pre-plan the hole locations, and reasonably arrange the steel bar layout. Use the deepened BIM construction model to extract the bill of quantities down to the component level, generate detailed lists of various assemblies, and assist in the submission of on-site material plans.

[0057] S3, grounding body construction: use the main reinforcement of the concrete frame or the reinforced steel bars for grounding body construction, and use the foundation and connecting beams for grounding body construction and grounding body installation.

[0058] In step S3, the concrete frame main bars or reinforcing steel bars are used as the grounding body for construction as follows: the main bars or reinforcing steel bars are welded together with steel bars of the same specifications to form a grid no larger than 5m×5m to ensure the continuity of the electrical connection, the main bars or reinforcing steel bars are welded together below the outdoor ground, and the two main bars or reinforcing steel bars are marked with colored paint.

[0059] In step S3, the construction of grounding body using foundation and connecting beam is specifically as follows: find the position of foundation group according to the size and position of design drawing, overlap and seal the reinforcement bars at the four corners of pile foundation of each group of foundation, and then weld them with at least 2 column main bars. Select 2 main bars in the hidden beam and use 12mm steel bar to weld on both sides for at least 80mm, forming a closed loop in the hidden beam, and weld the 2 main bars selected in the hidden beam to the embedded grounding connection plate below the outdoor ground, remove the coating, mark the two main bars with colored paint, and lead them out for at least 3m.

[0060] In step S3, the grounding body is installed as follows: the material, position, and welding quality of the grounding body should all comply with the construction specifications, and the grounding body resistance should be tested in a timely manner. When a natural grounding body is used, it should be tested after the bottom plate reinforcement is tied. If the grounding body resistance does not meet the design and specification requirements, an artificial grounding electrode should be added, and the grounding body resistance test should be recorded.

[0061] S4, down conductor laying: carry out grounding construction of the main reinforcement of the house and construction of the four corners of the house respectively.

[0062] In step S4, the main reinforcement grounding construction of the house is specifically as follows: when the down conductor is grounded using the main reinforcement of the house, a 40mm×4mm hot-dip galvanized flat steel is reserved 1m below the ground to connect to the outdoor comprehensive grounding, and a vertical grounding electrode is set at the connection point. If two cross-sectional areas of not less than 16mm are used in the structural column of the house, 2 The main reinforcement serves as the grounding steel bar. The upper end of the grounding steel bar is welded to the lightning protection strip, and the lower end is welded to the integrated grounding grid. The welding point between the down conductor and the lightning protection strip is treated with two coats of anti-rust paint and one coat of silver powder paint for anti-corrosion. The connection point with the outdoor integrated grounding is treated with two coats of asphalt paint for anti-corrosion.

[0063] In step S4, the construction of the four corners of the house is specifically as follows: pre-embed 12mm diameter hot-dip galvanized round steel at the four corner test points of the house, and the round steel is 500mm away from the outdoor floor.

[0064] S5, Lightning protection belt construction: The lightning protection belt is laid along the parapet and roof ridge around the house using hot-dip galvanized round steel, and the lightning protection belt is welded to the reserved grounding steel bars of the main reinforcement of the house.

[0065] In step S5, the lightning protection strip is laid along the parapet and ridge around the house using hot-dip galvanized round steel with a diameter of 12 mm. The lightning protection strip is supported by an adjustable bracket every 1 m. The adjustable bracket support is made of round steel of the same specification as the lightning protection strip. The height of the adjustable bracket support is 150±10 mm. No adjustable bracket support is set at the corner of the house. The lightning protection strip is welded to the reserved grounding steel bar of the main reinforcement of the house. After welding, the welding slag is knocked off and the welding point is checked. If it meets the requirements, it is painted with 2 coats of anti-rust paint and 1 coat of silver powder paint for anti-corrosion treatment.

[0066] S6, Lightning protection network construction: The roofs of relay stations, repeater stations, and communication base stations are laid with 40mm×4mm hot-dip galvanized steel in a grid no larger than 3m×3m, and connected to the lightning protection belt every 3m.

[0067] S7, component prefabrication: Use BIM technology to plan the layout of the Faraday cage on the roof and side walls, pre-process the Faraday cage grid structure, and directly fix the grid structure to the wall;

[0068] S8, house shielding construction.

[0069] In step S8, the specific steps of house shielding construction are:

[0070] t1, first connection: Place the prefabricated Faraday cage grid structure on the wall, ceiling, ground or floor of the communication and signal equipment room, weld the steel bars of the main reinforcement grid and the tension reinforcement grid, and connect the interior wall doors and windows to the Faraday cage and the main reinforcement in the wall;

[0071] t2, Second connection: When constructing the wall Faraday cage shielding, set up 4 door and window type grounding terminals at the doors and windows. The reserved height of the grounding terminals on both sides is unified. The grounding terminals are welded to the Faraday cage grid structure with a welding length of not less than 100mm. The grounding terminals are set 30-60mm away from both sides of the reserved openings of the doors and windows. The lower end of the grounding terminal of the door is not less than 1.5m from the ground, and the upper end of the terminal is 0.4m from the top of the door frame. The grounding terminals of the windows are set 0.2m away from the bottom and top of the window frame. The Faraday cage grid structure corresponding to the window adopts a mesh diameter not greater than 80×80mm and a cross-section not less than 9mm 2 Aluminum alloy mesh, door and window connection line uses 10mm 2 Flame-retardant yellow-green two-color soft copper wire, with cold-pressed terminal lugs at both ends. One end is connected to the reserved grounding terminal on the wall shield, and the other end is bolted to the window shielding aluminum mesh and the door frame.

[0072] In the second connection, spot welding is used at least 2 points at the cross intersection of round steel in the wall; at least at each corner on the inner side of the wall, a grounding plate is led out from the steel bars inside the wall for the connection of the anti-static floor bracket. The distance between the led-out grounding plates is not more than 5m, and the height of the grounding plate lead-out point is 0.1m from the ground.

[0073] t3, the third connection: the brackets of the anti-static floor are reliably connected and cold-pressed or welded to the Faraday cage grid structure corresponding to the wall. The distance between the connection points should be no more than 5m, and the cross-section of the multi-strand insulated soft wire used for welding or bolting should be no less than 10mm 2 Alternatively, use δ0.2mm×20mm copper foil tape on the ground to form a grid that is the same as the anti-static floor grid. The intersections of the grids are welded or connected to the brackets. At the same time, an anti-static floor pedestal is installed at the cabinet base to support the anti-static floor.

[0074] t4, Lightning protection construction: The cable grounding busbars in the mechanical room working area, protective connection, power supply lightning protection, and cable introduction room are managed by color separation, the copper busbars and flat steel are connected by welding technology, and the grounding collection line is connected to the outdoor comprehensive ground network with 40×4mm hot-dip galvanized flat steel.

[0075] S9, grounding test acceptance.

[0076] In step S9, all reserved grounding terminals are tested one by one to ensure that their grounding resistance values are lower than 1Ω and meet the design specifications.

[0077] In this invention, lightning protection grounding schematic diagram, building construction drawings, technical standard documents are collected to clarify the goal and combine with the instructions. Figure 3 , use BIM technology to deepen the construction technology of key processes such as grounding body, lightning protection down conductor, roof lightning protection belt, lightning protection net, grounding resistance test point, and house shielding, form a three-dimensional technical disclosure, pre-plan the hole location, and reasonably arrange the steel bar layout. Use the deepened BIM construction model to extract the engineering quantity list down to the component level, generate detailed lists of various assemblies, assist in the submission of on-site material plans, use the main reinforcement and reinforcing steel bars of the concrete frame as the grounding body, weld the main reinforcement bars with steel bars of the same specifications into a grid no larger than 5m×5m to ensure the continuity of the electrical connection, weld the main reinforcement bars below the outdoor ground, mark the two main reinforcement bars with colored paint for lead-out confirmation, and combine with the instructions attached Figure 4 , use the foundation and connecting beam as the grounding body, find the position of the foundation group according to the size and position of the design drawing, overlap and seal the steel bars at the four corners of each pile foundation, and then weld them with at least 2 main bars of the column. Select 2 main bars in the hidden beam and use 12mm steel bars to weld on both sides for at least 80mm, forming a closed loop in the hidden beam, and weld the main bars to the embedded grounding connection plate below the outdoor ground, remove the coating, mark the two main bars with colored paint, and lead them out for at least 3m, including: ①-Instructions for pre-buried installation of the disconnect card box; ②-Instructions for welding the foundation grounding grid and grounding lead-out jumper; ③-Instructions for welding material and construction process of the grounding body; ④-Lightning protection test The pilot pre-buried position is clear. After the grounding body is installed, the material, position and welding quality of the grounding body shall meet the requirements of the construction specifications. The grounding resistance shall be tested in time. When a natural grounding body is used as a grounding device, it shall be tested after the bottom plate reinforcement is tied. If the resistance value does not meet the design and specification requirements, an artificial grounding electrode shall be made. The grounding resistance test shall be recorded. When the down lead is grounded using the main reinforcement of the building, a 40mm×4mm hot-dip galvanized flat steel shall be reserved 1m below the ground to connect to the outdoor comprehensive grounding. A vertical grounding electrode shall be set at the connection point, and two cross-sectional areas of not less than 16mm in the building structure column shall be used. 2 The upper end of the main reinforcement used as grounding reinforcement must be welded to the lightning protection strip and the lower end must be welded to the integrated grounding grid. The welding point between the down conductor and the lightning protection strip should be treated with two coats of anti-rust paint and one coat of silver powder paint for anti-corrosion. The connection point with the outdoor integrated grounding should be treated with two coats of asphalt paint for anti-corrosion. Figure 5 and 6 , 12mm diameter hot dip galvanized round steel should be embedded in the four corner test points of the house, and the round steel should be 500mm away from the outdoor floor. Figure 7-10, the lightning protection belt is laid along the parapet and ridge around the building with hot-dip galvanized round steel with a diameter of 12mm. The lightning protection belt is supported by an adjustable bracket every 1m. The support rod is made of round steel with the same specifications as the lightning protection belt. The support bracket height is 150±10mm. No support rod is set at the corner of the house. The lightning protection belt is welded with the reserved grounding steel bar of the main reinforcement of the building. After welding, the welding slag is knocked off and the welding position is checked. If it meets the requirements, it is painted with 2 coats of anti-rust paint and 1 coat of silver powder paint for anti-corrosion treatment. The roof of the relay station, repeater station and communication base station is laid with 40mm×4mm hot-dip galvanized steel in a grid of no more than 3m×3m and connected to the lightning protection belt every 3m. Figure 11 and 12 The lightning protection grid is installed on the roof of the building in an open manner. In order to prevent damage to the roof waterproof layer and avoid the lightning protection grid from being soaked in water, the lightning protection grid needs to be padded with blocks. The height should be 100mm. It must be ensured that the lightning protection grid is flat and does not collapse. Figure 13 , BIM technology is used to plan the layout of the Faraday cage on the roof and side walls, pre-processing it into a large-area grid structure and directly fixing it on the wall. The grounding copper wire connection terminals are prefabricated in the machine room doors and windows before leaving the factory to avoid drilling holes in the door frames later. Figure 14 Place the prefabricated Faraday cage on the six sides, walls, ceiling, ground or floor of the communication and signal equipment room, weld the main reinforcement grid and the reinforcement grid, connect the inner wall doors and windows with the shielding cage and the main reinforcement in the wall, and Figure 15 and 16 , When constructing the wall Faraday cage shielding, set 4 door and window type grounding terminals at the doors and windows. The reserved height of the grounding terminals on both sides should be unified. The grounding terminals are welded to the shielding grid with a welding length of not less than 100mm. The terminals are set 30-60mm away from both sides of the reserved openings of the doors and windows. The lower end of the door grounding terminal is not less than 1.5m from the ground, and the upper end of the terminal is 0.4m from the top of the door frame. The window grounding terminal is set at 0.2m from the bottom of the window frame and the top. The window shielding adopts a mesh diameter not greater than 80×80mm and a cross-section not less than 9mm 2 Aluminum alloy mesh, door and window connection line uses 10mm 2Flame-retardant yellow-green two-color soft copper wire, cold-pressed terminal noses at both ends of the copper wire, one end connected to the reserved grounding terminal of the wall shield, the other end bolted to the window shielding aluminum mesh and the door frame, the connection needs to be polished, spot welding is used at the cross intersection of round steel and round steel in the wall, at least 2 points of welding, at least at each corner on the inside of the wall, a grounding plate is led out from the steel bar in the wall for connection of the electrostatic floor bracket, the distance between the led-out grounding plates is not more than 5m, and the height of the grounding plate lead-out point from the ground is 0.1m. The brackets of the anti-static floor should be reliably connected and cold-pressed, bolted or welded to the wall shielding cage, at least each corner should be connected, the distance between the connection points should be no more than 5m, and the cross-section of the multi-strand insulated soft wire used for welding or bolting should be no less than 10mm 2 Or use δ0.2mm×20mm copper foil tape on the ground to form a grid that is the same as the anti-static floor grid. The intersection of the grid should be welded or connected to each support. At the same time, install an anti-static floor base at the base of the cabinet to support the anti-static floor. Figure 17 and 18 The cable grounding busbars in the working area of the mechanical room, protective connection, power lightning protection, and cable introduction room are managed by color separation. The copper busbars are connected to the flat steel using welding technology. The grounding collection line uses 40×4mm hot-dip galvanized flat steel to connect to the outdoor comprehensive ground network. To ensure the reliability of the grounding system, the grounding terminals must be strictly tested after the construction is completed. All reserved grounding terminals should be tested one by one to ensure that their grounding resistance value is less than 1Ω and meets the design specifications.

[0078] The main materials of the present invention are shown in the following table.

[0079] Serial number name Specifications unit quantity 1 Grounding electrode Φ100, 1 meter long root 10 2 Grounding module set 10 3 steel bars Main reinforcement, round steel Φ12 rice 650 4 steel bars Main reinforcement, round steel Φ8 rice 2450 5 insulated copper wire <![CDATA[10mm 2 ]]> rice 50 6 Aluminum alloy shielding mesh <![CDATA[Grid 80mm*80mm, cross-section 9mm 2 > square meters 100 7 Grounding collection box indivual 8 8 Grounding copper busbar 30mm*3mm rice 40 9 Copper foil tape 0.75mm*30mm rice 400 10 Hot-dip galvanized flat steel 4mm*40mm rice 120 11 Hot-dip galvanized angle steel 5mm*50mm*50mm rice 120 12 static floor 600mm*600mm piece 300

[0080] The main tools and equipment of the present invention are shown in the following table.

[0081]

[0082]

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for lightning protection and grounding construction of communication signal houses based on BIM technology, characterized in that: The steps include: S1, Construction Preparation: Collect lightning protection grounding diagrams, building construction drawings, technical standard documents, and clarify the goals; S2, BIM Construction Design: Apply BIM technology to deepen the construction technology of key processes such as grounding bodies, lightning protection down conductors, roof lightning protection strips, lightning protection nets, grounding resistance test points, and house shielding. This involves forming a three-dimensional technical briefing, pre-planning hole locations, and rationally arranging steel bar layouts. The refined BIM construction model is then used to extract a detailed bill of quantities down to the component level, generating detailed lists of various assemblies to assist in submitting on-site material plans. S3, grounding body construction: using concrete frame main reinforcement or reinforced steel bars for grounding body construction, using foundation and connecting beams for grounding body construction and grounding body installation; S4, down conductor laying: carry out the grounding construction of the main reinforcement of the house and the construction of the four corners of the house respectively; S5, Lightning protection belt construction: The lightning protection belt is laid along the parapet and ridge around the house using hot-dip galvanized round steel, and the lightning protection belt is welded to the grounding steel bars reserved for the main reinforcement of the house; S6, Lightning protection network construction: The roofs of relay stations, repeaters, and communication base stations are laid out in a grid with hot-dip galvanized steel and connected to lightning protection strips at preset intervals; S7, component prefabrication: Use BIM technology to plan the layout of the Faraday cage on the roof and side walls, pre-process the Faraday cage grid structure, and directly fix the grid structure to the wall; S8, house shielding construction; S9, grounding test acceptance.

2. The method for lightning protection and grounding construction of communication signal houses based on BIM technology according to claim 1 is characterized in that: In step S3, the concrete frame main bars or reinforcing steel bars are used as the grounding body for construction as follows: the main bars or reinforcing steel bars are welded together with steel bars of the same specifications to form a grid no larger than 5m×5m to ensure the continuity of the electrical connection, the main bars or reinforcing steel bars are welded together below the outdoor ground, and the two main bars or reinforcing steel bars are marked with colored paint.

3. The method for lightning protection and grounding construction of communication signal houses based on BIM technology according to claim 1 is characterized in that: In step S3, the construction of grounding body using foundation and connecting beam is specifically as follows: find the position of foundation group according to the size and position of design drawing, overlap and seal the reinforcement bars at the four corners of pile foundation of each group of foundation, and then weld them with at least 2 column main bars. Select 2 main bars in the hidden beam and use 12mm steel bar to weld on both sides for at least 80mm, forming a closed loop in the hidden beam, and weld the 2 main bars selected in the hidden beam to the embedded grounding connection plate below the outdoor ground, remove the coating, mark the two main bars with colored paint, and lead them out for at least 3m.

4. The method for lightning protection and grounding construction of communication signal houses based on BIM technology according to claim 3 is characterized in that: In step S3, the grounding body is installed as follows: the material, position, and welding quality of the grounding body should all comply with the construction specifications, and the grounding body resistance should be tested in a timely manner. When a natural grounding body is used, it should be tested after the bottom plate reinforcement is tied. If the grounding body resistance does not meet the design and specification requirements, an artificial grounding electrode should be added, and the grounding body resistance test should be recorded.

5. The method for lightning protection and grounding construction of communication signal houses based on BIM technology according to claim 3 is characterized in that: In step S4, the main reinforcement grounding construction of the house is specifically as follows: when the down conductor is grounded using the main reinforcement of the house, a 40mm×4mm hot-dip galvanized flat steel is reserved 1m below the ground to connect to the outdoor comprehensive grounding, and a vertical grounding electrode is set at the connection point. If two cross-sectional areas of not less than 16mm are used in the structural column of the house, 2 The main reinforcement serves as the grounding steel bar. The upper end of the grounding steel bar is welded to the lightning protection strip, and the lower end is welded to the integrated grounding grid. The welding point between the down conductor and the lightning protection strip is treated with two coats of anti-rust paint and one coat of silver powder paint for anti-corrosion. The connection point with the outdoor integrated grounding is treated with two coats of asphalt paint for anti-corrosion.

6. The method for lightning protection and grounding construction of communication signal houses based on BIM technology according to claim 3 is characterized in that: In step S4, the construction of the four corners of the house is specifically as follows: pre-embed 12mm diameter hot-dip galvanized round steel at the four corner test points of the house, and the round steel is 500mm away from the outdoor floor.

7. The method for lightning protection and grounding construction of communication signal houses based on BIM technology according to claim 2 is characterized in that: In step S5, the lightning protection strip is laid along the parapet and ridge around the house using hot-dip galvanized round steel with a diameter of 12 mm. The lightning protection strip is supported by an adjustable bracket every 1 m. The adjustable bracket support is made of round steel of the same specification as the lightning protection strip. The height of the adjustable bracket support is 150±10 mm. No adjustable bracket support is set at the corner of the house. The lightning protection strip is welded to the reserved grounding steel bar of the main reinforcement of the house. After welding, the welding slag is knocked off and the welding point is checked. If it meets the requirements, it is painted with 2 coats of anti-rust paint and 1 coat of silver powder paint for anti-corrosion treatment.

8. The method for lightning protection and grounding construction of communication signal houses based on BIM technology according to claim 2 is characterized in that: In step S6, the roofs of the relay station, repeater station, and communication base station buildings are laid with 40mm×4mm hot-dip galvanized steel in a grid no larger than 3m×3m, and are connected to the lightning protection strip every 3m.

9. The method for lightning protection and grounding construction of communication signal houses based on BIM technology according to claim 2, characterized in that: In step S8, the specific steps of house shielding construction are: t1, first connection: Place the prefabricated Faraday cage grid structure on the wall, ceiling, ground or floor of the communication and signal equipment room, weld the steel bars of the main reinforcement grid and the tension reinforcement grid, and connect the interior wall doors and windows to the Faraday cage and the main reinforcement in the wall; t2, Second connection: When constructing the wall Faraday cage shielding, set up 4 door and window type grounding terminals at the doors and windows. The reserved height of the grounding terminals on both sides is unified. The grounding terminals are welded to the Faraday cage grid structure with a welding length of not less than 100mm. The grounding terminals are set 30-60mm away from both sides of the reserved openings of the doors and windows. The lower end of the grounding terminal of the door is not less than 1.5m from the ground, and the upper end of the terminal is 0.4m from the top of the door frame. The grounding terminals of the windows are set 0.2m away from the bottom and top of the window frame. The Faraday cage grid structure corresponding to the window adopts a mesh diameter not greater than 80×80mm and a cross-section not less than 9mm 2 Aluminum alloy mesh, door and window connection line uses 10mm 2 Flame-retardant yellow-green two-color soft copper wire, with cold-pressed terminal lugs at both ends. One end is connected to the reserved grounding terminal on the wall shield, and the other end is bolted to the window shielding aluminum mesh and the door frame. t3, the third connection: the brackets of the anti-static floor are reliably connected and cold-pressed or welded to the Faraday cage grid structure corresponding to the wall. The distance between the connection points should be no more than 5m, and the cross-section of the multi-strand insulated soft wire used for welding or bolting should be no less than 10mm 2 Alternatively, use δ0.2mm×20mm copper foil tape on the ground to form a grid that is the same as the anti-static floor grid. The intersections of the grids are welded or connected to the brackets. At the same time, an anti-static floor pedestal is installed at the cabinet base to support the anti-static floor. t4, Lightning protection construction: The cable grounding busbars in the mechanical room working area, protective connection, power supply lightning protection, and cable introduction room are managed by color separation, the copper busbars and flat steel are connected by welding technology, and the grounding collection line is connected to the outdoor comprehensive ground network with 40×4mm hot-dip galvanized flat steel.

10. The method for lightning protection and grounding construction of communication signal buildings based on BIM technology according to claim 2, characterized in that: In step S9, all reserved grounding terminals are tested one by one to ensure that their grounding resistance values are lower than 1Ω and meet the design specifications.

Images