A distributed lightning protection grounding balance system and method for recycling building pile foundation and steel structure

Abstract

The application discloses a distributed lightning protection grounding balance system and method for recycling building pile foundation and steel structure, and belongs to the technical field of building lightning protection grounding. The system comprises a pile foundation fusion bonding equipotential communication module, a steel structure segmented conductive cross-connection compensation module, a multi-point pile foundation impedance balance regulation and control module and a corrosion-resistant conductive transition joint module. A low-resistance grounding matrix is formed through full-coverage fusion bonding of pile foundation reinforcement nodes and interconnection of pile tops; a continuous current dispersion network is formed by implementing conductive cross-connection on the corrosion-resistant insulation breakpoints of the steel structure; a shunt weight model is established according to the pile foundation grounding resistance, the buried depth and the soil resistivity, and the high-resistance weak current dispersion points are reinforced; and the corrosion-resistant conductive transition joint is adopted to block the steel-copper electrochemical corrosion loop. The application can realize integrated low-resistance conduction of the pile foundation and the steel structure, multi-point balanced discharge of lightning current and long-term stability of the connection of different metals.

Description

Technical Field

[0001] This invention belongs to the technical fields of building lightning protection grounding, steel structure equipotential bonding, balanced discharge of natural grounding bodies, and building electrical safety protection. Specifically, it relates to a distributed lightning protection grounding balancing system and method that features full-domain conduction of pile foundation fusion, steel structure bridging and supplementation, intelligent impedance balancing at multiple points, and low-resistance connection with dissimilar metal corrosion resistance. It is applicable to the passive natural grounding long-term lightning protection renovation and new construction projects of high-rise buildings, steel structure workshops, prefabricated buildings, and mountain pile foundation building complexes. Background Technology

[0002] Existing buildings generally use pile foundations and steel structures as natural grounding bodies. However, the industry has long suffered from problems such as insufficient conductivity reliability, low utilization rate of structural current dissipation capacity, uneven current distribution at multiple grounding points, and easy corrosion of dissimilar metal connections. As a result, the natural grounding system of buildings is difficult to maintain long-term stability under the action of transient high current from lightning strikes.

[0003] 1. Uncontrollable conduction of pile foundation reinforcement. Traditional binding, spot welding, and lap splicing processes have a large number of loose connections and gaps, resulting in extremely high contact resistance. Under the high current of lightning strikes, these connections are prone to overheating, sparking, and current interruption, causing extremely uneven current distribution in the pile foundation group.

[0004] 2. Insulation and isolation of steel structure anti-corrosion layer. Modern building steel columns and beams are fully covered with anti-corrosion paint and fireproof coating, which makes the electrical insulation of the entire steel structure segmented and unable to conduct electricity as a whole. A large part of the main structure is idle and cannot participate in current dissipation, resulting in extremely low grounding utilization.

[0005] 3. Lack of balanced control mechanism for multiple pile foundations. A building may have dozens of pile foundations with large differences in soil environment, burial depth, and impedance. Without the calculation of current shunting weight and the means of balanced compensation, the lightning current is concentrated and discharged from the low-resistivity pile foundation, causing single-point overload, local rise in ground potential, and imbalance of lightning protection.

[0006] 4. Steel-copper dissimilar metal connections suffer from severe corrosion. Traditional direct steel-copper connections suffer from continuous electrochemical corrosion due to potential differences. The connection points rust year by year, and the resistance soars, causing the lightning protection system to fail within a short period of time. This results in high maintenance costs and significant safety hazards.

[0007] In summary, existing natural grounding technologies suffer from drawbacks such as unstable conduction, low structural utilization, unbalanced shunting, short lifespan, and poor reliability. There is a lack of a systematic, quantifiable, balanced, and long-term stable integrated lightning protection grounding technology system for pile foundations and steel structures. Summary of the Invention

[0008] I. Purpose of the invention.

[0009] To address the shortcomings of existing technologies such as high contact resistance in pile foundations, open circuits in steel structure insulation, unbalanced current distribution at multiple points, and corrosion failure of dissimilar metals, this invention provides a distributed lightning protection grounding balancing system and method that reuses both building pile foundations and steel structures. This system and method construct a fully reusable, globally low-resistance, distributed, balanced discharge, and long-term stable natural lightning protection grounding system for buildings by achieving zero-fragmentation fusion at all pile foundation nodes, full reconnection of insulation breaks in the steel structure, intelligent impedance balancing and current distribution across multiple pile foundations, and electrochemical corrosion prevention through steel-copper connections.

[0010] II. System Technical Solution.

[0011] A distributed lightning protection grounding equalization system for building pile foundations and steel structures includes a pile foundation fusion equipotential bonding module, a steel structure segmented conductive bridging compensation module, a multi-point pile foundation impedance equalization and control module, and a dissimilar metal corrosion-resistant conductive transition joint module.

[0012] The pile foundation fusion equipotential bonding module includes a fully fused integrated structure comprising the vertical and circumferential reinforcement cages and lap joints of all pile foundations. All reinforcement intersections and joints are fused together as a whole, eliminating gap resistance and loose connection resistance; the tops of each pile foundation are interconnected through an equipotential bonding strip, forming a distributed low-resistance grounding matrix for the pile foundation group.

[0013] The segmented conductive bridging compensation module for steel structures includes multiple sets of dedicated conductive bridging components for steel structures, conductive filling medium, and local insulation breakdown structures. It bridges and repairs electrical breaks in steel beams, columns, and flange joints caused by anti-corrosion coatings, creating a continuous, full-area electrical conduction network within the building's dispersed and insulated steel frame, ensuring all components participate in lightning current dissipation.

[0014] The multi-point pile foundation impedance balancing control module includes a pile foundation impedance acquisition unit, a geotechnical parameter input unit, a current distribution weight algorithm unit, and an impedance reinforcement matching unit. This module is used to automatically establish a multi-pile foundation grounding impedance model, identify high-resistivity pile foundations and weak current dissipation points, and achieve balanced distribution of current distribution load across the entire area by adding connecting nodes, local low-resistivity connection points, and cross-pile equipotential bonding.

[0015] The dissimilar metal corrosion-resistant conductive transition joint module is a special transition connection structure between the steel main body and the copper down conductor and copper grounding busbar. It has a low-resistance conductive layer, a corrosion-resistant isolation layer and a mechanical locking and sealing structure, which can isolate the potential difference between steel and copper, block the electrochemical corrosion circuit, and achieve long-term low resistance, no corrosion and stable conduction of dissimilar metal connection.

[0016] III. Methods and Technical Solutions.

[0017] A distributed lightning protection grounding balance method for reuse of building pile foundations and steel structures includes the following steps.

[0018] S1. Equipotential bonding of the entire pile foundation. A full-coverage fusion bonding process is implemented at all intersections, lap joints, and inter-layer continuity joints of the reinforcement cages of all pile foundations in the building, so that each pile foundation forms an integral homogeneous low-resistance conductor, eliminating loose connections and gap contact resistance; the tops of all pile foundations are interconnected to form an equipotential matrix of the pile foundation group.

[0019] S2. Conductive bridging compensation for insulation breaks in steel structures. For corrosion-resistant insulation breaks in steel beams, columns, splicing flanges, and segmented steel structures, the insulation layer is partially removed, segmented conductive bridging devices are installed and filled with conductive medium to ensure complete electrical continuity throughout the entire steel structure frame.

[0020] S3. Multi-pile foundation parameter acquisition and current shunting weight modeling. Batch testing of grounding resistance, burial depth, and soil resistivity of each pile foundation to establish a distributed pile foundation grounding model for the building complex; calculation of the lightning strike current shunting weight coefficient for each pile foundation using a multi-point grounding impedance balancing algorithm.

[0021] S4. Impedance Balancing Reinforcement for High and Low Impedance Pile Foundations. For high-impedance pile foundations and low current distribution weight locations, auxiliary connecting nodes, cross-pile equalization connection points, and local low-impedance reinforcement structures are added to balance the load discharge of the entire pile foundation and achieve multi-point uniform distributed discharge of lightning current.

[0022] S5. Steel-copper dissimilar metal corrosion-resistant transition installation. At the connection points between the main steel structure and the copper down conductor and copper grounding busbar, install corrosion-resistant conductive composite transition joints to isolate the potential difference between the dissimilar metals, block the corrosion circuit, and ensure long-term low transition resistance.

[0023] S6. Acceptance of the closed-loop balanced conduction system across the entire area. Complete the overall equipotential connectivity test, pile foundation impedance balance test, and retest the grounding resistance across the entire area to achieve a balanced closed-loop distributed lightning protection grounding system integrating the building pile foundation and steel structure.

[0024] IV. Working principle.

[0025] Under normal conditions, the system forms a globally stable equipotential system through a fully fused low-resistivity base for the pile foundation, a cross-connected conductive network in the steel structure, and anti-corrosion joints for dissimilar metals. During lightning strikes, the system uses a multi-point impedance balancing algorithm to distribute the discharge weight of each pile foundation, ensuring that the lightning current is evenly distributed and discharged across multiple pile foundations and steel structure current paths. This avoids concentrated impacts and localized ground potential rises, achieving a fully reusable, fully balanced, and long-lasting lightning protection grounding effect for the main building structure.

[0026] V. Beneficial Effects.

[0027] 1. Completely eliminates the hidden danger of pile foundation contact resistance, greatly improves the consistency of pile foundation conduction, and eliminates defects such as lightning strikes, overheating, and current interruption.

[0028] 2. Activate the current dissipation capacity of the steel structure, solve the problem of insulation breakage in the anti-corrosion layer, and increase the total area of ​​natural grounding current dissipation.

[0029] 3. Intelligent and balanced multi-point diversion prevents single-point pile foundation overload and local ground potential rise, thus improving lightning protection stability.

[0030] 4. Reduce the risk of electrochemical corrosion of steel and copper, enabling the grounding system to have a longer period of low-resistance stable operation capability.

[0031] 5. Significantly reduce the amount of artificial grounding work, maximize the reuse of the building's original structure, and reduce civil engineering and material costs.

[0032] 6. Applicable to all scenarios, suitable for new construction and renovation projects of high-rise buildings, super high-rise buildings, steel structure factories, prefabricated buildings, and mountain pile foundation building complexes. Attached Figure Description

[0033] Figure 1 Structural block diagram of a distributed lightning protection grounding equalization system that reuses building pile foundations and steel structures.

[0034] Figure 2 Schematic diagram of equipotential bonding of pile foundation and low-resistance grounding matrix of pile foundation group.

[0035] Figure 3 Schematic diagram of a segmented conductive bridging compensation structure for steel structures.

[0036] Figure 4 Flowchart for impedance balancing control of multi-point pile foundations.

[0037] Figure 5 Schematic diagram of a dissimilar metal corrosion-resistant conductive transition joint.

[0038] Figure 6 Flowchart of lightning protection grounding balancing method. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. The following content is for illustrative purposes only and is not intended to limit the scope of protection of the present invention.

[0041] During construction or renovation, the first step is to ensure the reinforcement cage of the pile foundation is conductive. Construction workers perform full-coverage welding of the vertical and circumferential reinforcement, lap joints, and inter-layer connection joints, creating a continuous metallic conductor within each pile. An equipotential bonding strip is installed at the top of each pile, reliably connected to the main reinforcement, forming a distributed low-resistance grounding matrix across multiple piles. This method avoids problems such as incomplete connections, loosening, and contact resistance drift that can occur with traditional binding, spot welding, or short lap joints.

[0042] In the steel structure sections, electrical continuity checks are performed on steel columns, beams, gusset plates, flange joints, and segmented steel components. When anti-corrosion paint, fire-retardant coatings, or assembly gaps cause continuity breaks, the insulation layer is locally removed, segmented conductive compensation jumpers are installed, and conductive filling media or anti-loosening fastening structures are placed at the contact surfaces to re-establish a continuous conductive network in the steel structure previously separated by the insulation layer. Once the steel structure is conductive, it, together with the pile foundation grounding matrix, constitutes the building's main current dissipation system.

[0043] During the multi-point pile foundation impedance balancing control process, the pile foundation impedance acquisition unit obtains the grounding resistance of each pile foundation, the geotechnical parameter input unit inputs the pile foundation depth, soil resistivity, water content, or stratum difference parameters, and the current shunting weight algorithm unit determines the corresponding lightning strike current shunting weight based on the impedance differences of each pile foundation. For high-resistivity pile foundations or weak current dissipation points, the impedance reinforcement matching unit outputs reinforcement schemes such as adding auxiliary connection nodes, cross-pile equalization connections, and local low-resistivity supplementary connection points to prevent lightning strike current from being concentrated in a single low-resistivity pile foundation for discharge.

[0044] At the connection points between the steel structure and the copper down conductor and copper grounding busbar, a dissimilar metal corrosion-resistant conductive transition joint is installed. This transition joint can be composed of a steel-side connection end, a copper-side connection end, a low-resistance conductive layer, a corrosion-resistant isolation layer, and a locking seal. The low-resistance conductive layer ensures electrical continuity between the steel and copper sides, the corrosion-resistant isolation layer blocks the direct electrochemical corrosion path between the steel and copper dissimilar metals, and the locking seal reduces the entry of moisture, salt spray, or construction contaminants into the connection interface.

[0045] After system installation, a full-area closed-loop acceptance test is conducted. The acceptance includes testing the equipotential bonding between the pile foundation and the steel structure, testing the grounding impedance of each pile foundation, testing the continuity of the bridging compensation points, testing the contact resistance of the dissimilar metal transition joints, and retesting the grounding resistance across the entire area. If the test reveals excessively high local impedance or insufficient current shunt weight, secondary reinforcement is performed according to the reinforcement locations output by the impedance balancing control module until the requirements for low resistance and balanced discharge across the entire area are met.

[0046] Through the above implementation method, the original pile foundation, steel structure and down conductor of the building are no longer separate grounding components, but are integrated into a distributed lightning protection grounding system that combines a low-resistance pile foundation matrix, a continuous current dissipation network of the steel structure, a dissimilar metal anti-corrosion connection system and a multi-point impedance equalization and control system.

Claims

1. A distributed lightning protection grounding equalization system for reuse in building pile foundations and steel structures, characterized in that, The system includes a pile foundation fusion equipotential bonding module, a steel structure segmented conductive bridging compensation module, a multi-point pile foundation impedance balancing and control module, and a dissimilar metal corrosion-resistant conductive transition joint module. The pile foundation fusion equipotential bonding module eliminates contact resistance through full-node fusion of the reinforcing cage, forming a low-resistance grounding matrix for the pile foundation group. The steel structure segmented conductive bridging compensation module repairs the breaks in the corrosion-resistant insulation, achieving full electrical continuity of the steel structure. The multi-point pile foundation impedance balancing and control module matches the current distribution load of each pile foundation through an impedance weighting algorithm, achieving distributed current distribution. The dissimilar metal corrosion-resistant conductive transition joint module isolates the potential difference between steel and copper, blocks electrochemical corrosion, and achieves long-term low-resistance connection.

2. The distributed lightning protection grounding equalization system for reuse of building pile foundations and steel structures according to claim 1, characterized in that, The pile foundation fusion equipotential bonding module includes vertical bars, circumferential bars, lap joints, and interlayer connecting joints of the pile foundation reinforcement cage. The vertical bars, circumferential bars, lap joints, and interlayer connecting joints form a single pile foundation as an integral homogeneous conductor through full-coverage fusion welding.

3. The distributed lightning protection grounding equalization system for reuse of building pile foundations and steel structures according to claim 1, characterized in that, The pile foundation fusion equipotential connection module also includes an equipotential convergence strip, which interconnects the tops of all pile foundations to form a distributed low-resistance grounding matrix for the pile foundation group.

4. The distributed lightning protection grounding equalization system for reuse of building pile foundations and steel structures according to claim 1, characterized in that, The segmented conductive bridging compensation module for steel structures is compatible with steel beams, steel columns, and splicing flanges with anti-corrosion, fireproof, and insulating coatings. It activates the overall current dissipation capability of the steel structure through local insulation removal, conductive bridging connection, and conductive medium filling.

5. The distributed lightning protection grounding equalization system for reuse of building pile foundations and steel structures according to claim 1, characterized in that, The multi-point pile foundation impedance balancing control module includes a pile foundation impedance acquisition unit, a soil and rock parameter input unit, a current shunting weight algorithm unit, and an impedance reinforcement matching unit. The current shunting weight algorithm unit establishes a pile foundation current shunting weight model based on pile foundation resistance, burial depth, and soil parameters. The impedance reinforcement matching unit is used to identify high-resistivity, weak-flow-dissipating points and output impedance reinforcement schemes.

6. The distributed lightning protection grounding equalization system for reuse of building pile foundations and steel structures according to claim 1, characterized in that, The dissimilar metal corrosion-resistant conductive transition joint module includes a steel-side connection end, a copper-side connection end, a low-resistance conductive layer, a corrosion-resistant isolation layer, and a locking seal. The low-resistance conductive layer is used to maintain the electrical continuity between the steel side and the copper side, and the corrosion-resistant isolation layer is used to block the electrochemical corrosion circuit between the steel and copper.

7. A distributed lightning protection grounding balancing method for reused in building pile foundations and steel structures, characterized in that, Includes the following steps: S1. Full coverage welding of all pile foundation reinforcement nodes to eliminate pile foundation contact resistance and construct an equipotential low-resistivity matrix for the pile foundation group; S2. Conductive jumpers are used to connect the broken points in the anti-corrosion insulation of the steel structure to achieve overall electrical continuity of the steel structure; S3. Grounding parameters of each pile foundation are collected, and a pile foundation current shunting weight model is established through a multi-point impedance balancing algorithm; S4. Impedance reinforcement and connection point addition are carried out on high-resistivity pile foundations to balance the lightning discharge load of the entire pile foundation area; S5. Anti-corrosion conductive composite transition joints are installed at the steel-copper dissimilar metal connection to block the electrochemical corrosion circuit; S6. The continuity and impedance balancing test of the entire area is completed to achieve the integrated distributed lightning protection grounding balance of the pile foundation and steel structure.

8. The distributed lightning protection grounding equalization method for reuse of building pile foundations and steel structures according to claim 7, characterized in that, In step S1, the cross nodes, lap nodes and interlayer continuity nodes of the pile foundation reinforcement cage are fused together, and the tops of all pile foundations are interconnected through an equipotential bonding strip.

9. The distributed lightning protection grounding equalization method for reuse of building pile foundations and steel structures according to claim 7, characterized in that, In step S3, the collected grounding parameters of each pile foundation include grounding resistance, pile foundation burial depth and soil resistivity. Based on the grounding parameters, a multi-pile foundation grounding impedance model is established and the lightning strike shunting weight coefficient of each pile foundation is calculated.

10. The distributed lightning protection grounding equalization method for reuse of building pile foundations and steel structures according to claim 7, characterized in that, In step S4, auxiliary connecting nodes, cross-pile equalization connection points, or local low-resistance reinforcement structures are added to high-impedance pile foundations or low-current-weighted key locations to ensure that the lightning discharge load of multiple pile foundations is evenly distributed, avoiding single-point concentrated current impact and local ground potential rise.

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