Lightning protection downlead connecting structure in fabricated building and construction method thereof

Abstract

The invention discloses a fabricated building lightning protection downlead connecting structure and a construction method thereof, and belongs to the technical field of building lightning protection engineering. The connection structure comprises a conductive unit pre-buried in a component in a factory; the modularized bridging connector is used for on-site quick connection, adopts an elastic crimping and lock catch type structure and is internally provided with conductive paste; the adjustable expansion joint is arranged at the structural joint and is used for compensating deformation; and the visual detection port is used for later detection. The construction method comprises the steps of BIM pre-design, factory prefabrication integration, on-site assembly construction and systematic testing. According to the invention, lightning protection downlead connection is changed from field processing to industrial assembly, so that the industrial problems of poor connection reliability, low construction efficiency, undetectable maintenance and the like in a traditional mode are solved, and high reliability, rapid construction and full-life-cycle digital management of an assembly type building lightning protection system are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building lightning protection engineering, and particularly relates to a lightning downlead connection structure in fabricated building and a construction method thereof. BACKGROUND

[0002] Fabricated building is becoming a development trend of the building industry due to its industrialization, standardization and modularization. However, the traditional lightning downlead system design is still mainly based on cast-in-place structure, and its connection mode (such as welding or binding) is seriously incompatible with the "dry, quick assembly" concept of fabricated building.

[0003] The prior art mainly has the following defects: 1. Incompatible connection nodes: fabricated components are prefabricated in the factory, and the on-site node reinforcement is discontinuous. The traditional downlead is difficult to reliably penetrate, and an electrical "break point" is easily formed.

[0004] 2. Low construction efficiency: wet operations such as secondary slotting, drilling and repair welding are required on site, which destroys the integrity of the prefabricated components, and the process cross interference is serious, which slows down the construction progress.

[0005] 3. Poor connection reliability: the quality of on-site welding is greatly affected by human factors, and false welding is easily formed; bolt connection is prone to increased contact resistance due to corrosion, affecting the lightning current discharge capacity.

[0006] 4. Low standardization: there is a lack of standardized connection components, and the design and construction are disconnected, and there is a lack of unified basis for acceptance.

[0007] 5. Insufficient maintainability: the downlead is hidden and cannot be checked and maintained, which poses a long-term safety hazard.

[0008] Therefore, there is an urgent need for a lightning downlead connection scheme that can adapt to the characteristics of fabricated building, achieve efficient, reliable, standardized and maintainable lightning downlead connection. SUMMARY

[0009] (I) Invention purpose The purpose of the present application is to overcome the deficiencies of the prior art and provide a lightning downlead connection structure for fabricated building and a construction method thereof, to realize factory prefabrication, on-site quick assembly, high reliability of electrical connection, and detectability and maintainability throughout the life cycle.

[0010] (II) Technical solution To achieve the above purpose, the present application adopts the following technical solution: A lightning downlead connection structure for fabricated building, comprising: Pre-embedded conductive unit for forming standardized electrical interface in factory prefabrication stage: integrally formed in prefabricated components such as wall panels, columns, floors, etc. during factory prefabrication stage, made of corrosion-resistant conductive materials such as copper alloy or stainless steel.

[0011] Modular jumper connector for realizing tool-free quick low-resistance connection: pre-embedded conductive unit for connecting adjacent components on site. It includes an elastic compression piece and a locking mechanism, the elastic compression piece provides continuous contact pressure, the locking mechanism realizes quick locking, and the two work together on the pre-embedded conductive unit to form a reliable electrical connection, and the modular jumper connector has a sealed cavity filled with conductive paste inside; This design ensures constant contact surface pressure, small contact resistance, excellent corrosion and anti-loose performance, and can realize quick connection of "one plug and one lock".

[0012] Adjustable expansion joint for compensating for deformation of building structure and maintaining electrical continuity: arranged in building structure joints or between floors. It is composed of a corrugated pipe and an internal woven conductive strip (such as a copper woven strip), which can effectively absorb the deformation caused by thermal expansion and contraction, settlement or vibration of the building, and always maintain the continuity of the electrical path.

[0013] Visual inspection port for later non-destructive detection and maintenance: arranged at key nodes such as the bottom of the downlead and between floors. It contains an openable protective box with dedicated test terminals inside for easy later resistance testing and connection status checking using instruments, and electronic identification can be arranged outside the port for information management.

[0014] The application also provides a prefabricated building lightning protection downlead construction method, comprising the following steps: 1. Design integration step: lightning protection system design is performed in advance in the BIM model, the downlead path is planned, the positions of the pre-embedded conductive units of each component and the interface forms are determined, and unique identification is given.

[0015] 2. Factory prefabrication step: during component production, the conductive unit is accurately pre-embedded, and strict continuity test (resistance ≤0.05Ω) is performed, and the test data is bound with the component identity information.

[0016] 3. On-site assembly step: after the components are hoisted into position, the modular jumper connector is used for quick plug-in connection, the expansion joint and the inspection port are installed. The whole process is a pure assembly construction with zero welding and zero wet work.

[0017] 4. System test and acceptance step: continuity test is performed on the whole system to ensure that the node resistance is ≤0.1Ω (meeting the requirements of GB 50057), and the data is uploaded to the digital management platform.

[0018] 5. Operation and maintenance phase: Regular or irregular non-destructive testing is performed through the detection port, and the data is traceable and comparable to achieve predictive maintenance.

[0019] (III) Beneficial Effects Compared with the prior art, the beneficial effects of the present invention are: 1. High reliability: Factory pre-embedding ensures interface accuracy and quality, while the application of flexible crimping and conductive paste guarantees long-term stable low contact resistance.

[0020] 2. High-efficiency construction: The on-site prefabricated operation greatly improves construction efficiency, shortens the construction period, and fully complies with the concept of prefabricated buildings.

[0021] 3. Standardization and modularization: By transforming connection nodes into standard industrial interfaces, standardization of design, production and construction is achieved, ensuring project quality.

[0022] 4. Adaptive and maintainable: Expansion joints effectively compensate for structural deformation; detection ports make "hidden works" no longer hidden, greatly improving the maintainability and safety of the system.

[0023] 5. Full-process digitalization: By combining BIM design with electronic identification and digital twin platforms, refined management of the entire lifecycle of lightning protection systems, from design, manufacturing, construction to operation and maintenance, has been achieved. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall connection of the lightning protection down conductor system of the present invention in a prefabricated building.

[0025] Figure 2 This is a cross-sectional view of the pre-embedded conductive unit in the precast wall panel.

[0026] Figure 3 This is an exploded view of the modular crossover connector, showing the elastic crimp tab, locking mechanism, and sealing cavity.

[0027] Figure 4 This is a schematic diagram of the adjustable expansion joint, showing the assembly relationship between the bellows and the internal braided conductive strip.

[0028] Figure 5 This is a schematic diagram of the installation of the visual testing port, showing the arrangement of the openable protective box and the test terminals.

[0029] Figure 6 This is a flowchart of the construction method of the present invention. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Example 1: refer to Figure 1 and Figure 2 During the production of precast concrete wall panel 1, a T-shaped stainless steel conductive terminal 2 is used as a pre-embedded conductive unit. It is precisely positioned and fixed in the mold before pouring concrete, so that its connection surface is exposed on the side of the wall panel. After the pre-embedding is completed, a micro-ohmmeter is used to test and ensure that its transition resistance with the steel mesh 3 inside the wall panel is less than 0.05Ω, and the data is recorded.

[0032] refer to Figure 3 The modular jumper connector 4 mainly consists of an engineering plastic shell 5, a pair of phosphor bronze elastic crimping tabs 6, a quick-connect mechanical locking mechanism 7, and an internal conductive paste sealing cavity 8. After two adjacent wall panels are hoisted into place, the operator, without the need for tools, aligns the connector 4 with the exposed pre-embedded conductive units 2 on both wall panels and inserts it forcefully until the locking mechanism 7 makes a "click" sound to lock it in place. The entire process is without welding or wet work, and the electrical connection can be completed within 30 seconds. The elastic crimping tabs 6 provide continuous pressure, while the conductive paste prevents oxidation and ensures long-term stable contact resistance.

[0033] Example 2: At the connection between the steel structure column and the concrete floor slab, an adjustable expansion joint is installed due to the difference in thermal expansion coefficients between the two materials. (Reference) Figure 4 The expansion joint 9 consists of a stainless steel corrugated pipe 10 and a large-section tin-plated copper braided strip 11. The two ends of the braided strip 11 are fixed to the down conductor terminal of the steel column 12 and the pre-embedded conductive unit of the floor slab 13 by copper bolts, respectively. The corrugated pipe 10 provides protection. This structure allows for small axial and lateral displacements, avoiding connection point breakage due to deformation stress.

[0034] Example 3: On the first floor of the building, before the down conductor enters the grounding grid, a visual detection port 14 is installed. (Reference) Figure 5 The port includes a wall-mounted waterproof protective box 15 with an easily openable lid. Inside, there is a dedicated copper test terminal 16 for reliable connection to the down conductor. An electronic tag 17 is affixed to the outer surface of the box; scanning it allows access to the node's construction records and historical test data, enabling identification and data traceability. Maintenance personnel can simply open the box to measure the grounding resistance with instruments without damaging the building's finish.

[0035] The entire process of digital management, such as Figure 6 As shown, starting from the BIM model to complete the lightning protection down conductor path planning and generate component-level drawings with unique identifiers, the factory produces pre-embedded conductive units and enters test data. On-site, modular jumper connectors are used for rapid, solderless assembly. Finally, the test data is uploaded to the cloud platform to form a complete digital twin, providing a data foundation for subsequent intelligent operation and maintenance.

[0036] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A prefabricated building lightning downlead connection structure, characterized in that, Comprise: Pre-buried conductive unit for forming standardized electrical interface in factory prefabrication stage, which is integrally formed in prefabricated components of buildings; Modular jumper connector for realizing tool-free quick low-resistance connection, which comprises elastic pressure connector and locking mechanism, the elastic pressure connector provides continuous contact pressure, the locking mechanism realizes quick locking, both of which work together on the pre-buried conductive unit to form reliable electrical connection, the modular jumper connector has a sealed cavity filled with conductive paste; Adjustable expansion joint for compensating deformation of building structure and maintaining electrical continuity, which is arranged at building structure joint or floor joint, comprising bellows and woven conductive tape arranged therein; Visual detection port for post-period non-destructive detection and maintenance, which is arranged at key nodes of downlead, comprising openable protective box and test terminal arranged therein.

2. The prefabricated building lightning downlead connection structure according to claim 1, characterized in that, The pre-buried conductive unit is made of copper alloy or stainless steel material, and the electrical continuity test is carried out in the factory prefabrication stage to ensure that the resistance value of the pre-buried conductive unit and the steel bars in the prefabricated components is not greater than 0.05Ω.

3. The prefabricated building lightning downlead connection structure according to claim 1, characterized in that, The locking mechanism of the modular jumper connector is a quick plug-in mechanical lock, which can complete the electrical connection of a node within 30 seconds through "one plug and one lock" action without tools.

4. The prefabricated building lightning downlead connection structure according to claim 1, characterized in that, The woven conductive tape in the adjustable expansion joint is a red copper woven tape or a tinned copper woven tape.

5. The prefabricated building lightning downlead connection structure according to claim 1, characterized in that, The protective box of the visual detection port is provided with an electronic identification for identity recognition and data tracing.

6. The prefabricated building lightning downlead connection structure according to any one of claims 1 to 5, characterized in that, It also comprises a digital management assembly for realizing the whole life cycle digital management of lightning protection system, including the linkage of digital management platform and BIM model, the pre-buried conductive unit and the visual detection port are both provided with unique identification, and the construction and detection data are uploaded to the digital management platform.

7. A construction method of a lightning down conductor for a prefabricated building using the connection structure according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: Design integration step: complete lightning protection downlead path planning in BIM model, determine the position and specification of pre-buried conductive unit in each prefabricated component, and generate component-level lightning protection connection drawing with unique identification; Factory prefabrication step: integrally form the pre-buried conductive unit in the specified position of the component during prefabricated component production, and carry out electrical continuity test, store the test data associated with the unique identification into electronic files; On-site assembly step: after hoisting the prefabricated components into position, all electrical connections are completed through plug-in mechanical connection without welding or wet work, specifically, the pre-buried conductive units of adjacent components are quickly connected using the modular jumper connector, the adjustable expansion joint is installed at the structure joint, and the visual detection port is installed at the same time; System test step: after the connection is completed, use the grounding resistance tester to test the entire downlead system to ensure that the resistance value of all connection nodes is not greater than 0.1Ω, and upload the test data to the management platform.

8. The construction method according to claim 7, characterized in that, In the on-site assembly step, the connection operation realizes zero welding and zero wet work.

9. The construction method according to claim 7, characterized in that, In the operation and maintenance stage, non-destructive sampling is carried out regularly through the visual detection port, and the detection data is compared and analyzed with the initial data to realize state early warning.

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