Electromagnetic shielding method for building wall

Abstract

The invention relates to the technical field of building wall electromagnetic shielding, and particularly discloses an electromagnetic shielding method for a building wall, which comprises the following steps of: S1, determining an axis, and releasing a middle line and a side line of the wall by taking the axis as a datum line; insulating plates are laid on the floor, a keel frame is built according to the paying-off position, and the keel frame is fixedly installed on the wall and the ceiling through insulating parts; the keel frame is electrically isolated from the building main body through the insulating plate and the insulating part; s2, opening holes used for installing a shielding door and a shielding window are formed in the keel frame, and a shielding plate is installed on the ground insulation plate and the keel frame; conductive linings are arranged at connection gaps among the keel frame, the shielding plate, the shielding door and the shielding window, and the conductive linings enable the shielding structures to form a continuous conductive shielding surface.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding technology for building walls, and in particular discloses an electromagnetic shielding method for building walls. Background Technology

[0002] In the construction field, with the widespread application of electronic equipment and precision instruments, especially in places with stringent electromagnetic environment requirements such as PET-MRI laboratories, the demand for electromagnetic shielding of building walls is becoming increasingly urgent. However, existing electromagnetic shielding technologies for building walls have many problems. In traditional construction, insufficient layout accuracy often results in errors exceeding the allowable range, leading to deviations in the keel erection position and an inability to effectively form a shielding structure. Furthermore, it is difficult to achieve complete electrical isolation between the keel frame and the main building structure, easily creating electromagnetic conduction paths. Improper treatment of joints and corners of various shielding components results in discontinuous conductive shielding surfaces, severely affecting shielding performance. The poor synergy between functional components such as waveguides and filters and the shielding system, coupled with the lack of professional electromagnetic shielding design in the ventilation system, poses a significant risk of electromagnetic leakage. In addition, construction quality inspection methods are limited, lacking full-band, multi-dimensional testing methods, and there is a lack of quality control standards for the entire construction process and newly added components, making it difficult to guarantee the final shielding effectiveness. Therefore, there is an urgent need for a building wall electromagnetic shielding technology that is precise in construction, has reliable shielding performance, and offers controllable quality. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide an electromagnetic shielding method for building walls.

[0004] To achieve the above objectives, the present invention provides an electromagnetic shielding method for building walls, characterized by comprising the following steps:

[0005] S1. Determine the axis line, and use the axis line as a reference line to lay out the center line and edge line of the wall; lay an insulating board on the floor, and build a keel frame according to the layout position. The keel frame is installed and fixed to the wall and ceiling through insulating parts; the keel frame is electrically isolated from the main building through the insulating board and insulating parts.

[0006] S2. Openings for installing shielded doors and windows are made in the keel frame, and shielded plates are installed on the ground insulation board and the keel frame; conductive linings are provided at the connection gaps between the keel frame, shielded plates, shielded doors, and shielded windows, and the conductive linings make each shielding structure form a continuous conductive shielding surface. The continuous conductive shielding surface encloses the shielding room, forming a Faraday cage structure.

[0007] Preferably, when laying out the wall centerline and edge lines, the opening position lines should be laid out simultaneously to provide a precise positional reference for subsequent keel construction and opening modifications. Lay PVC insulation boards on the ground, with a thickness of not less than 5mm. Apply three layers of conductive sealant to the joints, ensuring each layer completely covers the gaps and is of uniform thickness to effectively isolate electromagnetic conduction paths from the ground. Use high-precision total stations and other professional surveying instruments for layout, ensuring the error is controlled within ±2mm. When constructing the keel frame, the main keel should be spaced 50-100mm from the wall surface, and the secondary keel should be fixed to the original wall surface at 300mm intervals using insulated corner brackets. After installation at each fixing point, an insulation resistance test must be performed to ensure an insulation resistance ≥10MΩ, meeting electrical isolation requirements.

[0008] Preferably, after the keel frame is erected, the opening profiles are beveled and deburred to make their surfaces smooth and flat. Then, waveguides are modified and installed to effectively suppress electromagnetic wave leakage through the opening. A laser calibrator is used to calibrate the shielded door frame, ensuring that the vertical and horizontal errors are within ±1mm. The door leaf gap is adjusted to 2-3mm, and conductive sealing components with good elasticity and conductivity are installed. Simultaneously, the shielded window is fixed to the opening. The edges of the metal shielding plate are welded to the opening profiles and door / window frames using a full welding process. If conductive adhesive strips are used for pressing, the strip width should not be less than 50mm. A double-layer conductive reinforcement layer is installed at the joints of the shielding plate and fixed with rivets spaced 100mm apart. L-shaped conductive bushings are used for 90° angle fixing at the internal and external corners. Highly conductive epoxy adhesive is used to bond the multiple conductive bushings together, with a tested bonding strength of ≥5MPa, ensuring that all shielding structures are tightly connected to form a continuous conductive shielding surface.

[0009] Furthermore, the keel frame is provided with openings for installing waveguides. The waveguides include return air waveguides for guiding indoor air recirculation, air intake waveguides for introducing outdoor fresh air, and emergency exhaust waveguides for rapid exhaust in emergency situations. A conductive liner is provided between the waveguides and the openings so that the waveguides and each shielding structure form a continuous conductive shielding surface.

[0010] Preferably, the keel frame has pre-drilled openings for waveguide installation. Before waveguide installation, the opening dimensions are checked using high-precision measuring tools to ensure the error is within ±0.5mm. The waveguide is made of stainless steel with a wall thickness of not less than 2mm. During installation, the waveguide's cutoff characteristics are fully utilized to block electromagnetic leakage. The waveguide and the air inlet of the non-magnetic aluminum duct are connected through a flange interface with a conductive sealing structure. The interface is wrapped with conductive copper wire mesh for secondary sealing. The outer surface of the non-magnetic aluminum duct is electrically bonded to the shielding plate every 200mm using conductive clips. After bonding, a resistance test is performed to ensure that the bonding resistance is ≤0.01Ω, so that the waveguide and the non-magnetic aluminum duct work together to maintain the electromagnetic shielding effectiveness of the building wall.

[0011] Furthermore, the keel frame includes a main keel installed on an insulating board, a secondary wall keel installed on the main keel, and a secondary ceiling keel. The insulating components include insulating corner pieces and insulating hangers. The insulating corner pieces are used to connect the wall to the secondary wall keel, and the insulating hangers are used to connect the ceiling to the secondary ceiling keel.

[0012] Preferably, the main keel can be made of aluminum profiles or 10# channel steel with equivalent stability, while the secondary keel uses 50×50×5mm square tubing, compatible with the main keel. The secondary keel is fixed to the original wall surface at 300mm intervals using insulated corner brackets, while the main keel is installed 50-100mm apart from the wall surface. Insulated hangers are made of high-strength nylon, and a hanger point is installed every 1000mm during ceiling secondary keel installation. After all keels are installed, an overall structural stability test and insulation resistance test are conducted to ensure the keel structure is stable and the electrical insulation resistance to the building structure is ≥10MΩ.

[0013] Furthermore, the fireproof board is installed on the secondary wall keel using self-tapping screws. The fixing point of the self-tapping screws is located on the secondary wall keel and does not contact the shielding plate. Glass fiber cotton is filled between the fireproof board and the shielding plate, and the glass fiber cotton does not contact the conductive liner.

[0014] Preferably, a 10mm thick calcium silicate fireproof board is installed on the secondary wall joists. The self-tapping screws are made of stainless steel, and to prevent the screw heads from conducting electricity, they must be insulated. The screw spacing is controlled at 200-250mm. The fiberglass wool has a density ≥32kg / m³. 3 During the filling process, special tools are used to ensure that the filling is dense and without gaps, and the glass fiber cotton and conductive liner are kept at a distance of more than 20mm to avoid affecting the conductivity of the conductive liner.

[0015] Furthermore, the keel frame is provided with an opening for installing a quench pipe. The quench pipe is welded to the top shielding plate by gas shielded welding-argon arc welding, and the quench pipe protrudes from the opening and extends to the outside of the wall at least 5 meters above the ground.

[0016] Preferably, an installation channel is reserved in the shielding wall for installing the quench pipe. The quench pipe is made of 304 stainless steel with a wall thickness of ≥3mm. Before installation, the quench pipe is pre-bent according to the actual installation angle to ensure that the welding angle with the shielding plate is 90°±2°. During welding, a multi-layer, multi-pass welding process is used to ensure that the weld height is ≥5mm. After welding, the weld is subjected to 100% penetrant testing to ensure welding quality. The quench pipe is bridging the metal shielding plate of the shielding wall with copper braided tape. After bridging, a resistance test is performed to ensure that the bridging resistance is ≤0.05Ω, ensuring the integrity of electromagnetic shielding.

[0017] Furthermore, multiple layers of conductive lining are provided at the inside and outside corners of each shielding structure and at the inside and outside corners where the shielding structures are connected. The multiple layers of conductive lining are bonded together with conductive adhesive.

[0018] Preferably, the conductive liner is made of beryllium copper with a thickness ≥0.3mm and an overlap length of ≥50mm per layer. Multiple conductive liner layers are bonded together using conductive silver adhesive. After bonding and curing, a peel strength test is performed, requiring a peel strength ≥10N / cm. The conductive liner at internal and external corners is precisely bent according to the actual angle, ensuring a deviation of ≤5° from the actual angle, guaranteeing a tight fit and forming a good conductive path.

[0019] Furthermore, both the ceiling secondary keel and the wall secondary keel include multiple load-bearing keels, which are arranged in an interval matrix on the main keel.

[0020] Preferably, the spacing between the ceiling secondary keel and the supporting keel is set to 600×600mm, and the spacing between the wall secondary keel and the supporting keel is set to 400×400mm; the supporting keel and the main keel are isolated by insulating gaskets with a thickness of ≥3mm to ensure the electrical insulation performance between the supporting keel and the main keel, while ensuring the stability of the keel structure.

[0021] Furthermore, the keel frame is provided with holes for assembling the filter, and the shielding plate is provided with receiving holes in accordance with the holes. The filter passes through the receiving holes, and its wires extend into the shielding chamber formed by the shielding plate and are connected to the circuit in the shielding chamber. The filter and the shielding plate are electrically connected by a conductive bushing, together forming a continuous conductive shielding surface.

[0022] Preferably, pre-drilled holes in the keel frame and shielding plate are used to install the filter. Before installation, the filter undergoes comprehensive performance testing to ensure that key performance indicators such as insertion loss meet design requirements. After adding a conductive bushing, the filter is installed in the pre-drilled holes in the shielding plate. The conductive bushing is secured to the shielding plate with bolts, with a bolt spacing ≤50mm. Double-shielded cables are used for the power supply. To avoid interference, the wiring path must avoid the area above the magnet. It is connected to the external power supply equipment via a through-wall waveguide or shielded cable connector. The connector is triple-sealed to ensure reliable electrical connection and to avoid affecting the shielding environment.

[0023] Furthermore, a non-magnetic aluminum duct is installed on the shielding plate, and the non-magnetic aluminum duct is provided with an air outlet and an air inlet; the air inlet is connected to the air inlet waveguide, the return air waveguide and the emergency exhaust waveguide through an interface with a conductive sealing structure, and the outer surface of the non-magnetic aluminum duct is electrically bonded to the shielding plate through a conductive liner, using the waveguide cutoff characteristics to block electromagnetic leakage and jointly maintain the electromagnetic shielding effectiveness of the building wall.

[0024] Preferably, a non-magnetic aluminum duct made of 6061-T6 material with a wall thickness of ≥1.5mm is installed on the shielding plate. A double-layer conductive sealing ring is installed at the air inlet interface, and the compression of the sealing ring is strictly controlled to be between 20% and 30% during installation. The outer surface of the non-magnetic aluminum duct is electrically bonded to the shielding plate every 200mm using conductive clips. The bonding area is treated with conductive oxidation to enhance the reliability of the electrical connection and ensure that the non-magnetic aluminum duct works in tandem with the entire shielding system to maintain good electromagnetic shielding effectiveness.

[0025] Furthermore, the following steps are included:

[0026] S3. After completing steps S1 and S2, use a magnetic shielding testing device to test the full-band shielding effectiveness of the magnetic shielding space formed by the continuous conductive shielding surface to verify whether its shielding effect meets the standards. After passing the test, proceed with the construction of the remaining building components. During the construction process, ensure that the newly added components are electrically isolated from the magnetic shielding space or that the continuity of electromagnetic shielding is achieved through conductive lining.

[0027] Preferably, after construction is completed, a 3D near-field scanner is used to test the shielding effectiveness of the magnetically shielded space across the entire frequency band (10kHz-18GHz), with a test point spacing of ≤300mm, and a required shielding effectiveness of ≥100dB. After passing the test, final acceptance is conducted, including shielding layer resistance testing (≤0.1Ω) and airtightness testing (leakage rate ≤0.5m). 3 / h). Complete the finishing work such as installing the ceiling (using non-magnetic keel), lighting fixtures (with electromagnetic shielding covers), non-magnetic aluminum ducts, and aluminum alloy cable trays. In subsequent construction, conduct electrical performance tests on each new component to ensure that it maintains good electrical isolation from the magnetic shielding space or achieves the continuity of electromagnetic shielding through conductive lining, so that the magnetic shielding space ultimately meets the usage requirements.

[0028] The beneficial effects of this invention are:

[0029] (1) Precise construction ensures shielding effect: High-precision total station is used for layout, with the error controlled within ±2mm. The position line of the opening is laid out simultaneously to provide a precise benchmark for the construction of the keel and the modification of the opening. The keel frame and the main building are electrically isolated from the building body through insulating boards and insulating parts, with an insulation resistance of ≥10MΩ, cutting off the electromagnetic conduction path and ensuring the shielding effect from the source of construction.

[0030] (2) Multi-dimensional enhancement of shielding performance: Conductive linings are installed at the joints of each shielding structure, and multiple layers of conductive linings are used at the internal and external corners and precisely bent to ensure the formation of a continuous conductive shielding surface. The installation of waveguides, filters and other components and their electrical treatment with the shielding system, combined with the conductive bonding design of the non-magnetic aluminum duct of the ventilation system, block various electromagnetic leakage paths.

[0031] (3) Full-process quality control system: After construction is completed, a three-dimensional near-field scanner is used to conduct full-band testing, and the shielding effectiveness is ≥100dB. The shielding layer resistance and air tightness are also tested. In subsequent construction, newly added components must maintain electrical isolation or continue shielding to form a complete quality control chain to ensure that the final shielding effect meets the standards. Attached Figure Description

[0032] Figure 1 This is a flowchart illustrating the steps of an electromagnetic shielding method for building walls according to the present invention.

[0033] Figure 2 This is a schematic diagram of the keel frame of the structure of the present invention;

[0034] Figure 3 This is a schematic diagram of a portion of the wall structure of the present invention;

[0035] Figure 4 This is a cross-sectional view of a portion of the wall structure of the present invention.

[0036] The attached diagram includes the following reference numerals: 1. Keel frame; 2. Insulating component; 3. Opening; 4. Main keel; 5. Secondary wall keel; 6. Secondary ceiling keel; 7. Insulating corner bracket; 8. Insulating hanger; 9. Fireproof board; 11. Fiberglass wool. Detailed Implementation

[0037] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0038] Please see Figures 1 to 4 As shown, the present invention provides an electromagnetic shielding method for building walls, characterized by comprising the following steps:

[0039] S1. Determine the axis line and lay out the center line and edge line of the wall using the axis line as the reference line; lay an insulating board on the floor and build a keel frame 1 according to the laying position. The keel frame 1 is installed and fixed to the wall and ceiling through insulating parts 2; the keel frame 1 is electrically isolated from the main building through the insulating board and insulating parts 2.

[0040] S2. An opening 3 is made in the keel frame 1 for installing the shielding door and shielding window. A shielding plate is installed on the ground insulation board and the keel frame 1. Conductive linings are provided at the connection gaps between the keel frame 1, the shielding plate, the shielding door, and the shielding window. The conductive linings make each shielding structure form a continuous conductive shielding surface. The continuous conductive shielding surface encloses the shielding room, forming a Faraday cage structure.

[0041] In practical use, by determining the axis and laying the centerline and edge lines of the wall, and using insulating boards and insulating components 2 to electrically isolate the keel frame 1 from the main building, this design can effectively block the electromagnetic conduction path between the main building and the shielding structure, avoiding the electromagnetic interference of the building itself from affecting the shielding room. At the same time, it prevents the electromagnetic signals inside the shielding room from spreading out through the main building, ensuring the independence and electromagnetic shielding effect of the shielding room from the basic level. Shielding doors and shielding window openings 3 are reasonably opened on the keel frame 1, and conductive linings are installed at the joints between the keel frame 1, shielding boards, shielding doors, and shielding windows, so that each shielding structure forms a continuous conductive shielding surface, ultimately forming a Faraday cage structure.

[0042] This structure effectively shields against various types of external electromagnetic interference. Whether it's high-intensity industrial electromagnetic radiation or complex communication frequency interference, it effectively blocks it from entering the shielded area, ensuring stable operation of indoor electronic equipment and accurate data transmission. This provides an ideal operating environment for precision electronic instruments and communication equipment. Simultaneously, the continuous conductive shielding surface prevents electromagnetic signals generated indoors from leaking out, avoiding interference with surrounding equipment. More importantly, it ensures the security of confidential information within the shielded area, preventing information theft through electromagnetic radiation. This has significant application value in locations with extremely high electromagnetic shielding requirements, such as data centers, secure conference rooms, and electromagnetic compatibility laboratories. Furthermore, this method integrates shielding functionality with the building's wall structure. Compared to traditional independent shielding equipment, the installation process is more aligned with the building construction process, offering advantages such as convenient construction, structural stability, and easy maintenance. It can be flexibly applied to electromagnetic shielding retrofits and new construction projects for different types of buildings, effectively reducing overall construction costs, improving building functionality and applicability, and providing a reliable and economical solution for various scenarios with special electromagnetic environment requirements.

[0043] Preferably, when laying out the centerline and edge lines of the wall, the position lines of opening 3 are laid out simultaneously to provide a precise positional reference for subsequent keel construction and opening 3 modification. A PVC insulating board with a thickness of not less than 5mm is laid on the ground. The joints are sealed with three layers of conductive sealant, each layer completely covering the gaps and of uniform thickness to effectively isolate the electromagnetic conduction path on the ground. High-precision total stations and other professional surveying instruments are used for layout to ensure the error is controlled within ±2mm. When constructing the keel frame 1, the main keel 4 is set 50-100mm away from the wall surface, and the secondary keels are fixed to the original wall surface at 300mm intervals using insulated corner brackets 7. After installation at each fixing point, an insulation resistance test is required to ensure that the insulation resistance is ≥10MΩ, meeting the electrical isolation requirements.

[0044] After the keel frame 1 is erected, the profile of opening 3 is beveled and deburred to make its surface smooth. Then, it is modified and a waveguide is installed to effectively suppress electromagnetic wave leakage through opening 3. A laser calibrator is used to calibrate the shielded door frame, ensuring that the vertical and horizontal errors are within ±1mm. The door leaf gap is adjusted to 2-3mm, and conductive sealing components with good elasticity and conductivity are installed. Simultaneously, the shielded window is fixed to opening 3. The edges of the metal shielding plate are welded to the profile of opening 3 and the door and window frame using a full welding process. If conductive adhesive strips are used for pressing, the strip width should not be less than 50mm. A double-layer conductive reinforcement layer is set at the joints of the shielding plate and fixed with rivets spaced 100mm apart. L-shaped conductive bushings are used for 90° angle fixing at the internal and external corners. Highly conductive epoxy adhesive is used to bond the multiple conductive bushings together, and the tested bonding strength must be ≥5MPa to ensure that all shielding structures are tightly connected, forming a continuous conductive shielding surface.

[0045] In actual use, the position line of opening 3 is laid out simultaneously, and the layout error is controlled within ±2mm using a high-precision total station. This greatly improves construction accuracy, allowing for precise matching of subsequent keel construction and opening 3 modification, reducing secondary adjustments and material waste caused by positional deviations, ensuring the fit of each component installation, and thus improving the overall performance of the shielding system. The PVC insulation board is at least 5mm thick and undergoes three-layer sealing treatment, significantly enhancing insulation and sealing performance. It effectively isolates electromagnetic conduction from the ground while preventing the influence of external factors such as moisture and dust on the shielding system. The spacing between the main keel 4 and the wall, the fixed spacing of the secondary keel, and the insulation resistance testing requirements, while ensuring the structural stability of the keel frame 1, strictly ensure its electrical isolation performance, preventing the keel from becoming a medium for electromagnetic conduction. These detailed measures optimize the basic construction process from multiple aspects, including construction accuracy, material performance, and installation standards, further strengthening the electromagnetic shielding effect and improving construction quality and system stability.

[0046] Specifically, the keel frame 1 is provided with an opening 3 for installing waveguides. The waveguides include a return air waveguide for guiding indoor air recirculation, an intake air waveguide for introducing outdoor fresh air, and an emergency exhaust air waveguide for emergency linkage and rapid exhaust. A conductive liner is provided between the waveguides and the opening 3 so that the waveguides and each shielding structure form a continuous conductive shielding surface.

[0047] In practical use, openings 3 for installing waveguides are set on the keel frame 1, and the waveguide type is clearly defined, providing a solution for the coordinated realization of ventilation and electromagnetic shielding performance of the building walls. The installation of return air waveguides, intake air waveguides, and emergency exhaust air waveguides can meet indoor air circulation needs and ensure indoor environmental quality. Simultaneously, utilizing the cutoff characteristics of the waveguides, electromagnetic wave leakage through the ventilation openings can be effectively blocked, achieving functional ventilation while avoiding weak points in electromagnetic shielding caused by the ventilation openings 3. By reserving specific openings 3 in the keel frame 1 to install waveguides, the waveguides are tightly integrated with the entire shielding system, ensuring the integrity of electromagnetic shielding during ventilation. This satisfies both the functional requirements of the building and guarantees the electromagnetic shielding effect, providing a reliable ventilation and shielding solution for building spaces with strict electromagnetic environment requirements.

[0048] A waveguide is a device that uses a specific structure to guide the transmission of electromagnetic waves or fluids (air in this scenario) and blocks electromagnetic wave leakage through its cutoff characteristics. Its core principle is that when the cross-sectional dimensions and shape of the waveguide meet specific conditions, electromagnetic waves cannot propagate through the waveguide below the cutoff frequency, while fluids such as air can flow normally. In this building wall application, the waveguide forms a tubular channel through metal materials or conductive structures. On the one hand, it uses its geometric structure to achieve directional airflow (such as return air, intake air, and exhaust air); on the other hand, it uses a conductive liner and shielding structure to form a continuous conductive surface. Utilizing the reflection loss and cutoff effect of electromagnetic waves on the inner wall of the waveguide, it prevents electromagnetic signals from leaking through the ventilation opening 3, thus achieving both ventilation function and electromagnetic shielding performance.

[0049] Preferably, the keel frame 1 has a pre-reserved opening 3 for installing the waveguide. Before installing the waveguide, the opening 3 is checked for dimensions using high-precision measuring tools to ensure the error is within ±0.5mm. The waveguide is made of stainless steel with a wall thickness of not less than 2mm. During installation, the waveguide's cutoff characteristics are fully utilized to block electromagnetic leakage. The waveguide and the air inlet of the non-magnetic aluminum duct are connected through a flange interface with a conductive sealing structure. The interface is wrapped with conductive copper wire mesh for secondary sealing. The outer surface of the non-magnetic aluminum duct is electrically bonded to the shielding plate every 200mm using conductive clips. After bonding, a resistance test is performed to ensure that the bonding resistance is ≤0.01Ω, so that the waveguide and the non-magnetic aluminum duct work together to maintain the electromagnetic shielding effectiveness of the building wall.

[0050] In actual use, the dimensions of opening 3 are checked before installation, and the error is controlled within ±0.5mm to ensure precise fit of the waveguide installation and prevent electromagnetic leakage risks caused by dimensional deviations. The use of stainless steel waveguides with a wall thickness of not less than 2mm enhances their structural strength and electromagnetic shielding performance, ensuring stability and reliability during long-term use. The connection between the waveguide and the non-magnetic aluminum duct is achieved through a flange interface with a conductive sealing structure and a secondary seal using conductive copper wire mesh, as well as electrical bonding between the non-magnetic aluminum duct and the shielding plate. This further strengthens the electrical continuity between the ventilation and shielding systems, synergistically maintaining the electromagnetic shielding effectiveness of the building walls. These detailed measures optimize the waveguide installation in terms of material selection, installation accuracy, and connection methods, maximizing electromagnetic shielding effectiveness while ensuring ventilation function and effectively reducing the risk of electromagnetic leakage.

[0051] Specifically, the keel frame 1 includes a main keel 4 installed on an insulating board, a wall secondary keel 5 installed on the main keel 4, and a ceiling secondary keel 6. The insulating component 2 includes an insulating corner piece 7 and an insulating hanger 8. The insulating corner piece 7 is used to connect the wall to the wall secondary keel 5, and the insulating hanger 8 is used to connect the ceiling to the ceiling secondary keel 6.

[0052] In practical use, the main keel 4 is installed on the insulating board, providing the main load-bearing capacity for the entire keel frame 1. The wall secondary keel 5 and ceiling secondary keel 6 are used to support the shielding plates on the wall and ceiling, respectively, ensuring reliable support for the shielding structure in different directions. The use of insulating corner brackets 7 and insulating hangers 8 not only achieves a stable connection between the keel frame 1 and the building walls and ceiling, but also ensures electrical isolation between the keel frame 1 and the main building structure, preventing electromagnetic conduction through the keel. This keel frame 1 structural design ensures the mechanical stability of the shielding system, enabling it to withstand the weight of the shielding plates and equipment, while maintaining good electromagnetic shielding performance. It provides a stable and reliable foundation for the subsequent installation of the shielding layer and the realization of the overall shielding effect, and is suitable for electromagnetic shielding projects of various building walls.

[0053] Preferably, the main keel 4 can be made of aluminum profile or 10# channel steel with equivalent stability to aluminum profile, and the secondary keel uses 50×50×5mm square tubing, compatible with the main keel 4. The secondary keel is fixed to the original wall surface at 300mm intervals using insulated corner brackets 7, and the main keel 4 is installed at a 50-100mm interval from the wall surface; the insulated hangers 8 are made of high-strength nylon, and a hanger point is set every 1000mm when installing the ceiling secondary keel 6. After all keels are installed, an overall structural stability test and an insulation resistance test are performed to ensure that the keel structure is stable and that the electrical insulation resistance between the keel structure and the main building is ≥10MΩ.

[0054] In practical use, the main keel 4 can be made of aluminum profile or 10# channel steel, while the secondary keel uses 50×50×5mm square tubing, providing diverse and adaptable material options. This ensures the stability of the keel frame 1 while meeting the strength and cost requirements of different projects. Clear specifications for parameters such as the fixed spacing of the secondary keel, the distance between the main keel 4 and the wall, and the setting of hanging points standardize the keel installation process, ensuring uniform stress distribution and overall stability of the keel frame 1. The use of high-strength nylon insulated hangers 8 and the insulation resistance testing requirements further enhance the electrical isolation performance of the keel frame 1. Through detailed regulations on keel materials, installation processes, and insulation performance, the electrical insulation performance and structural stability of the keel frame 1 are improved while ensuring its load-bearing capacity, thereby better supporting the shielding layer and enhancing the reliability and durability of the entire electromagnetic shielding system.

[0055] Specifically, the fireproof board 9 is installed on the wall sub-keel 5 by self-tapping screws. The fixing point of the self-tapping screws is located on the wall sub-keel 5 and does not contact the shielding plate. Glass fiber cotton 11 is filled between the fireproof board 9 and the shielding plate. The glass fiber cotton 11 does not contact the conductive liner.

[0056] In practical use, the installation of fireproof boards 9 and fiberglass wool 11 on the secondary wall keel 5 achieves electromagnetic shielding while also ensuring building fire safety. The fireproof boards 9 are installed on the secondary wall keel 5 with self-tapping screws that do not contact the shielding plate, preventing the screws from becoming electromagnetic conduction paths. This ensures electromagnetic shielding effectiveness while providing fire protection for the wall, meeting building fire safety regulations. The fiberglass wool 11 filling the space between the fireproof boards 9 and the shielding plate further enhances the wall's heat and sound insulation performance, improving the quality of the building's indoor environment. Simultaneously, it ensures that the fiberglass wool 11 does not contact the conductive lining, preventing it from affecting the conductivity of the conductive lining and ensuring the integrity of the continuous conductive shielding surface. This structural design organically combines electromagnetic shielding, fireproofing, heat insulation, and sound insulation, giving the building wall multiple protective properties in electromagnetic shielding projects, improving the building's safety and functionality.

[0057] Preferably, a 10mm thick calcium silicate fireproof board 9 is installed on the secondary wall keel 5. The self-tapping screws are made of stainless steel, and to prevent the screw heads from conducting electricity, they must be insulated. The screw spacing is controlled at 200-250mm. Glass fiber wool 11 has a density ≥32kg / m³. 3 During the filling process, special tools are used to ensure that the filling is dense and without gaps, and the glass fiber cotton 11 is kept at a distance of more than 20mm from the conductive liner to avoid affecting the conductivity of the conductive liner.

[0058] In practical application, 10mm thick calcium silicate fireproof board 9 is selected. The insulation treatment and fixing spacing of the stainless steel self-tapping screws are clearly defined, strengthening the standardization and fire resistance of the fireproof board 9 installation, while effectively preventing the screws' conductivity from affecting electromagnetic shielding. The density and filling requirements of glass fiber cotton 11 are specified, and its spacing with the conductive lining is ensured. This improves the heat and sound insulation effect while ensuring the normal conductivity of the conductive lining, maintaining the effectiveness of the continuous conductive shielding surface. These detailed measures improve the fireproofing and filling treatment of the wall sub-keel 5 in terms of material specifications, installation process, and performance assurance. While ensuring electromagnetic shielding effectiveness, they further enhance the comprehensive performance of the building walls in terms of fire resistance, heat insulation, and sound insulation, improving building quality and safety.

[0059] Specifically, the keel frame 1 is provided with an opening 3 for installing a quench pipe. The quench pipe is welded to the shielding plate at the top by gas shielded welding-argon arc welding, and the quench pipe protrudes from the opening 3 and extends to the outside of the wall at least 5 meters above the ground.

[0060] In practical use, a quench pipe installation opening 3 is set on the keel frame 1, and the welding method and extension length of the quench pipe to the shielding plate are specified to ensure the safe operation of specific equipment (such as superconducting equipment). The quench pipe is used to quickly release energy when the superconducting equipment experiences a quench fault. It is welded to the top shielding plate by gas shielded welding-argon arc welding, ensuring the electrical connection and structural stability of the quench pipe and the shielding system, so that the quench pipe will not damage the integrity of the shielding system during operation. The quench pipe protrudes from the opening 3 and extends to the outside of the wall at least 5 meters above the ground to ensure that the fault energy can be safely released to the outside, avoiding harm to personnel and equipment inside. This design meets the special requirements of superconducting equipment while maintaining the electromagnetic shielding effect of the building wall, providing a safe and reliable technical solution for places involving superconducting technology and other places with strict requirements for the electromagnetic environment.

[0061] Preferably, an installation channel is reserved in the shielding wall for installing the quench pipe. The quench pipe is made of 304 stainless steel with a wall thickness of ≥3mm. Before installation, the quench pipe is pre-bent according to the actual installation angle to ensure that the welding angle with the shielding plate is 90°±2°. During welding, a multi-layer, multi-pass welding process is used to ensure that the weld height is ≥5mm. After welding, the weld is subjected to 100% penetrant testing to ensure welding quality. The quench pipe is bridging the metal shielding plate of the shielding wall with copper braided tape. After bridging, a resistance test is performed to ensure that the bridging resistance is ≤0.05Ω, ensuring the integrity of electromagnetic shielding.

[0062] In practical applications, the material, wall thickness, and pre-bending requirements of the superconducting duct must be clearly defined to ensure its structural strength and installation compatibility, enabling it to withstand working pressure and environmental influences. Regulations regarding multi-layer, multi-pass welding processes, weld flaw detection, and bridging resistance testing ensure reliable welding quality and good electrical connections between the superconducting duct and the shielding plate. This guarantees the normal functioning of the superconducting duct while maintaining the electromagnetic shielding performance of the shielding system. These detailed installation processes and performance testing requirements comprehensively guarantee the installation quality of the superconducting duct and the stability of the shielding system, meeting the safe operation requirements of superconducting equipment and effectively preventing electromagnetic leakage problems that may arise from the installation of the superconducting duct, thereby improving the safety and reliability of the entire electromagnetic shielding project.

[0063] Specifically, multiple layers of conductive lining are provided at the inside and outside corners of each shielding structure and at the inside and outside corners where the shielding structures are connected. The multiple layers of conductive lining are bonded together with conductive adhesive.

[0064] In practical applications, multiple layers of bent conductive lining are installed at the internal and external corners of each shielding structure, effectively solving the problem of electromagnetic leakage at these corners. Internal and external corners are weak points in the shielding structure, where electromagnetic waves are easily reflected and diffracted, leading to leakage. The multiple layers of conductive lining increase the number of reflections and absorptions of electromagnetic waves, reducing their penetration ability; the bent design allows them to closely fit the complex shapes of the corners, ensuring conductive continuity. The conductive linings are bonded together with conductive adhesive, ensuring good electrical connection between each layer and forming a complete conductive shielding surface. This design addresses the critical parts of the shielding structure, enhancing the shielding performance of the entire system at the corners, compensating for weaknesses in the shielding structure, improving the integrity and effectiveness of electromagnetic shielding of building walls, and ensuring a stable electromagnetic environment within the shielded space.

[0065] Preferably, the conductive liner is made of beryllium copper with a thickness ≥0.3mm and an overlap length of ≥50mm per layer. Multiple conductive liner layers are bonded together using conductive silver adhesive. After bonding and curing, a peel strength test is performed, requiring a peel strength ≥10N / cm. The conductive liner at internal and external corners is precisely bent according to the actual angle, ensuring a deviation of ≤5° from the actual angle, guaranteeing a tight fit and forming a good conductive path.

[0066] In practical applications, the conductive liner is specified to be made of beryllium copper, with precise thickness and overlap length to ensure good conductivity and mechanical strength, effectively blocking electromagnetic waves. Conductive silver adhesive is used for bonding, with clearly defined peel strength requirements to ensure a strong and reliable electrical connection between multiple conductive liner layers, preventing detachment or poor contact. The conductive liner is precisely machined and bent according to the actual angle, ensuring a tight fit with the inside and outside corners, with a deviation controlled within ≤5° to minimize gaps and improve shielding effectiveness. These detailed measures refine the conductive liner design in terms of material properties, connection methods, and processing precision, strengthening electromagnetic shielding performance at critical inside and outside corners, effectively preventing electromagnetic wave leakage, and further enhancing the shielding effectiveness and reliability of the entire electromagnetic shielding system.

[0067] Specifically, the ceiling secondary keel 6 and the wall secondary keel 5 each include multiple load-bearing keels, which are arranged in an interval matrix on the main keel 4.

[0068] In practical use, the ceiling secondary keel 6 and wall secondary keel 5 contain multiple load-bearing keels arranged in a spaced matrix, optimizing the load-bearing structure of the keel frame 1. The spaced matrix arrangement of the multiple load-bearing keels ensures that the weight of the shielding plate is evenly distributed on the main keel 4, enhancing the load-bearing capacity of the keel frame 1 for the shielding plate and other equipment, and improving the mechanical stability of the entire shielding structure. This arrangement ensures structural strength while making rational use of materials, avoiding excessive keel density that would increase costs and complicate construction. The uniform keel distribution also facilitates the installation of subsequent components such as the shielding plate, ensuring installation accuracy and the integrity of the shielding system. It provides a stable supporting foundation for forming a continuous and effective conductive shielding surface, enabling the building walls to maintain good electromagnetic shielding performance even under various loads.

[0069] Preferably, the spacing between the ceiling secondary keel 6 and the supporting keel is set to 600×600mm, and the spacing between the wall secondary keel 5 and the supporting keel is set to 400×400mm; the supporting keel and the main keel 4 are isolated by an insulating gasket with a thickness of ≥3mm to ensure the electrical insulation performance between the supporting keel and the main keel 4, while ensuring the stability of the keel structure.

[0070] In practical application, the spacing between the ceiling secondary keel 6 and the wall secondary keel 5 is clearly defined, and the load-bearing keel is isolated from the main keel 4 by insulating gaskets. While ensuring the load-bearing capacity of the keel frame 1, the structural design is further optimized. Appropriate spacing ensures uniform stress distribution on the keel frame 1, avoiding localized stress concentration, while also meeting the requirements for ease of construction and installation. The use of insulating gaskets maintains the stability of the keel structure while ensuring electrical insulation between the load-bearing keel and the main keel 4, preventing electromagnetic conduction through the keel. By improving the structural layout and electrical performance of the keel frame 1, the load-bearing capacity and stability of the keel frame 1 are enhanced, while its electrical insulation performance is guaranteed, thereby better supporting the shielding layer and improving the reliability and stability of the entire electromagnetic shielding system.

[0071] Specifically, the keel frame 1 is provided with holes for assembling filters, and the shielding plate is provided with receiving holes in accordance with the holes. The filter passes through the receiving holes, and its wires extend into the shielding chamber formed by the shielding plate and are connected to the circuit in the shielding chamber. The filter and the shielding plate are electrically connected by a conductive bushing, together forming a continuous conductive shielding surface.

[0072] In practical use, filter mounting holes are provided in the keel frame 1 and the shielding plate, and the electrical connection method between the filter and the shielding plate is specified, thus solving the electromagnetic compatibility problem of the circuit system within the shielded space. The filter installation effectively suppresses electromagnetic interference generated in the circuit, preventing it from being conducted to the outside of the shielded space through power lines, while also preventing external electromagnetic interference from entering the shielded space and affecting the normal operation of the circuit. The filter passes through the receiving holes in the shielding plate and forms an electrical connection with the shielding plate through a conductive insert, ensuring that the filter and the entire shielding system form a continuous conductive shielding surface. This maintains the electromagnetic shielding integrity of the shielded space while achieving the circuit function. This design enables electrical equipment within the shielded space to operate stably in a favorable electromagnetic environment, meeting the usage requirements of places with strict electromagnetic environment requirements (such as electronic laboratories and communication equipment rooms).

[0073] Preferably, pre-drilled holes are made in the keel frame 1 and the shielding plate for filter installation. Before installation, the filter undergoes comprehensive performance testing to ensure that key performance indicators such as insertion loss meet design requirements. After adding a conductive bushing, the filter is installed in the pre-drilled holes in the shielding plate. The conductive bushing is secured to the shielding plate with bolts, with a bolt spacing ≤ 50mm. Double-shielded cables are used for the power supply. To avoid interference, the wiring path must avoid the area above the magnet. It connects to the external power supply equipment through a through-wall waveguide or shielded cable connector. The connector is triple-sealed to ensure reliable electrical connection and to avoid affecting the shielding environment.

[0074] In practical use, a comprehensive performance test is conducted on the filter before installation to ensure it meets design requirements, guaranteeing its electromagnetic interference suppression effect from the outset. The installation method and bolt tightening spacing after adding the conductive bushing to the filter, as well as the wiring requirements and joint sealing treatment of the power cord, are clearly defined, further strengthening the electrical connection and electromagnetic shielding performance between the filter and the shielding system. Through these detailed measures, while ensuring the filter functions properly to suppress electromagnetic interference, power cords and other components are effectively prevented from becoming electromagnetic leakage paths, ensuring good compatibility between the circuit system within the shielded space and the entire shielding system. Optimization in equipment selection, installation process, and wiring treatment improves the electromagnetic compatibility and overall shielding effectiveness of the circuit system within the shielded space, providing a reliable guarantee for the stable operation of electronic equipment within the shielded space.

[0075] Specifically, a non-magnetic aluminum duct is installed on the shielding plate, and the non-magnetic aluminum duct is provided with an air outlet and an air inlet; the air inlet is connected to the air inlet waveguide, the return air waveguide and the emergency exhaust waveguide through an interface with a conductive sealing structure, and the outer surface of the non-magnetic aluminum duct is electrically bonded to the shielding plate through a conductive liner, so as to block electromagnetic leakage by utilizing the waveguide cutoff characteristics and jointly maintain the electromagnetic shielding effectiveness of the building wall.

[0076] In practical use, non-magnetic aluminum ducts are installed on the shielding plate, and their connection method and electrical bonding requirements with the waveguide are specified, achieving an organic integration of the building ventilation system and the electromagnetic shielding system. The air outlets and inlets of the non-magnetic aluminum ducts are connected to the waveguide, meeting indoor ventilation needs and ensuring indoor air quality. The conductive sealing structure of the air inlet and the electrical bonding treatment between the outer surface of the non-magnetic aluminum duct and the shielding plate utilize the waveguide's cutoff characteristics to effectively block electromagnetic leakage through the duct while achieving ventilation, ensuring the integrity of the entire building's electromagnetic shielding during ventilation. This design resolves the contradiction between ventilation requirements and electromagnetic shielding, enabling buildings to maintain strict electromagnetic environment requirements while providing good ventilation. It is suitable for locations with high requirements for both ventilation and electromagnetic shielding, such as data centers and precision instrument rooms.

[0077] Preferably, a non-magnetic aluminum duct made of 6061-T6 material with a wall thickness of ≥1.5mm is installed on the shielding plate. A double-layer conductive sealing ring is installed at the air inlet interface, and the compression of the sealing ring is strictly controlled to be between 20% and 30% during installation. The outer surface of the non-magnetic aluminum duct is electrically bonded to the shielding plate every 200mm using conductive clips. The bonding area is treated with conductive oxidation to enhance the reliability of the electrical connection and ensure that the non-magnetic aluminum duct works in tandem with the entire shielding system to maintain good electromagnetic shielding effectiveness.

[0078] In practical applications, specifying the material and wall thickness of the non-magnetic aluminum duct, as well as the requirements for the sealing ring and compression at the air inlet interface, improves the structural strength and sealing performance of the duct, ensuring stable operation of the ventilation system while enhancing electromagnetic shielding. The conductive clip bonding spacing and conductive oxidation treatment on the outer surface of the non-magnetic aluminum duct further strengthen its electrical connection with the shielding plate, ensuring good conductive continuity between the entire ventilation and shielding systems. These detailed process and parameter specifications perfect the installation of non-magnetic aluminum ducts in terms of material properties, connection sealing, and electrical treatment. While ensuring ventilation functionality, they maximize electromagnetic shielding effectiveness, effectively preventing electromagnetic leakage problems caused by the ventilation system and improving the overall quality of building wall electromagnetic shielding projects.

[0079] Specifically, it includes the following steps:

[0080] S3. After completing steps S1 and S2, use a magnetic shielding testing device to test the full-band shielding effectiveness of the magnetic shielding space formed by the continuous conductive shielding surface to verify whether its shielding effect meets the standards. After passing the test, proceed with the construction of the remaining building components. During the construction process, ensure that the newly added components are electrically isolated from the magnetic shielding space or that the continuity of electromagnetic shielding is achieved through conductive lining.

[0081] In practical applications, post-construction shielding effectiveness testing and subsequent construction requirements ensure the quality of electromagnetic shielding projects for building walls. By using magnetic shielding testing equipment to perform full-band shielding effectiveness testing on the magnetically shielded space, the electromagnetic shielding effect after construction can be comprehensively evaluated, and potential shielding loopholes or weaknesses can be identified in a timely manner. After passing the test, subsequent construction of building components is carried out, requiring that new components maintain electrical isolation from the magnetically shielded space or achieve electromagnetic shielding continuity, ensuring that the performance of the electromagnetic shielding system is not affected throughout the entire construction process. This construction process design, from post-construction acceptance testing to subsequent construction specifications, forms a complete quality control system, ensuring that the final electromagnetic shielding effect of the building walls meets design and usage requirements, and improving the reliability and stability of the electromagnetic shielding project.

[0082] Preferably, after construction is completed, a 3D near-field scanner is used to test the shielding effectiveness of the magnetically shielded space across the entire frequency band (10kHz-18GHz), with a test point spacing of ≤300mm, and a required shielding effectiveness of ≥100dB. After passing the test, final acceptance is conducted, including shielding layer resistance testing (≤0.1Ω) and airtightness testing (leakage rate ≤0.5m). 3 / h). Complete the finishing work such as installing the ceiling (using non-magnetic keel), lighting fixtures (with electromagnetic shielding covers), non-magnetic aluminum ducts, and aluminum alloy cable trays. In subsequent construction, conduct electrical performance tests on each new component to ensure that it maintains good electrical isolation from the magnetic shielding space or achieves the continuity of electromagnetic shielding through conductive lining, so that the magnetic shielding space ultimately meets the usage requirements.

[0083] In practical use, a 3D near-field scanner is employed for full-band detection, clearly defining the spacing between detection points and shielding effectiveness indicators. This makes the detection more accurate and comprehensive, enabling more detailed identification of electromagnetic shielding issues within the shielded space. Acceptance testing includes additional testing of shielding layer resistance and airtightness, evaluating the shielding system's quality from multiple dimensions to ensure its electrical and sealing performance meets requirements. During subsequent construction, electrical performance testing is conducted on newly added components, and the installation of components such as non-magnetic keels and electromagnetic shielding covers is strictly regulated, further strengthening the guarantee of electromagnetic shielding continuity. These specific testing methods, acceptance standards, and construction requirements construct a more rigorous and comprehensive quality control system, ensuring the performance of the building wall electromagnetic shielding system in all aspects after construction and during subsequent construction processes, ensuring that the final delivered building space meets high electromagnetic environment standards.

[0084] The working principle of this invention is as follows: A PVC insulation board with a thickness of ≥5mm is laid on the floor. The keel frame 1 is electrically isolated from the wall and ceiling through the insulating corner brackets 7 and insulating hangers 8, with an insulation resistance of ≥10MΩ, cutting off the electromagnetic conduction path. Openings 3 are made on the keel frame 1 to install shielding doors, windows, waveguides, and other components. A beryllium copper conductive liner with a thickness of ≥0.3mm is set at the connection gaps between the keel frame 1 and the shielding board, doors, windows, and at the internal and external corners. Multiple layers overlap ≥50mm and are fixed by rivets or adhesive to form a continuous conductive shielding surface, utilizing metal reflection and skin effect. Absorbing electromagnetic waves; the waveguide opening 3 is sized as follows: 300mm×300mm, 400mm×400mm, and 200mm×200mm for return air waveguide, air inlet waveguide, and emergency exhaust waveguide, respectively. The waveguide cross-sectional dimensions meet the electromagnetic wave cutoff frequency requirements of 10kHz-18GHz. A conductive liner is installed between the waveguide and opening 3. It is connected to the non-magnetic aluminum duct through a flange interface with a conductive sealing structure. The interface is wrapped with conductive copper wire mesh. The outer surface of the duct is attached to the shielding plate with conductive clips. The resistance is ≤0.01Ω. The waveguide cutoff characteristics are used to block electromagnetic leakage from the ventilation opening.

[0085] The filter is installed within the receiving holes of the keel frame 1 and the shielding plate. A conductive bushing is placed between the outer shell and the shielding plate. The bolt spacing is ≤50mm. The wires are connected via through-wall waveguides or shielded cable connectors, with triple sealing at the joints. The quench pipe extends ≥5m from the top opening 3 to the outside of the wall, is made of 304 stainless steel, has a wall thickness ≥3mm, and is argon-arc welded to the top shielding plate with a weld seam ≥5mm. It is bridged by copper braided tape, with a resistance ≤0.05Ω. The main keel 4 is installed on the insulating plate, and the secondary keel on the wall... The main keel 5 and ceiling secondary keel 6 are fixed by insulated corner brackets 7 and insulated hangers 8. The load-bearing keels are arranged in a matrix with a spacing of 400mm×400mm and 600mm×600mm respectively, and are isolated from the main keel 4 by ≥3mm insulating gaskets. The wall secondary keel 5 is installed with 10mm thick calcium silicate fireproof board 9. The screws are made of stainless steel and are insulated, with a spacing of 200-250mm. The fixing points do not contact the shielding plate. The space between the fireproof board 9 and the shielding plate is filled with ≥32kg / m³ of material. 3 11g of fiberglass wool is used, with a spacing ≥20mm between it and the conductive liner. During construction, a high-precision total station is used for layout, with an error ≤±2mm. After completion, a 3D near-field scanner is used to test the shielding effectiveness across the entire frequency band (10kHz-18GHz), achieving ≥100dB. The shielding layer resistance is ≤0.1Ω, and the airtightness test shows a leakage rate ≤0.5m. 3 / h, to ensure shielding effectiveness.

[0086] In this embodiment, a composite conductive strip is provided at the joint between the conductive liner and the shielding plate. The composite conductive strip includes an outer layer of weather-resistant silicone rubber, a middle layer of conductive silver fiber woven mesh, and an inner layer of moisture-absorbing and expanding resin. The sheet resistance of the conductive silver fiber woven mesh is ≤0.1Ω / sq, and the expansion rate of the moisture-absorbing and expanding resin layer is ≥15% when the ambient humidity is >60%. The pre-compression rate of the composite conductive strip is 20%-25% when the conductive liner is installed. When the ambient humidity increases and causes the joint to deform, the inner layer of resin absorbs moisture and expands to fill the gap, and the middle layer of conductive mesh maintains electrical connection.

[0087] In practical applications, the design of composite conductive strips provides multiple safeguards for the electromagnetic shielding and sealing performance at the joint between the conductive liner and the shielding plate. The outer layer of weather-resistant silicone rubber possesses excellent environmental adaptability, resisting ultraviolet radiation, high and low temperature changes, and chemical corrosion, extending the service life of the strips and ensuring long-term stable operation in complex building environments. The middle layer of conductive silver fiber woven mesh, with its extremely low surface resistivity (≤0.1Ω / sq), can efficiently conduct current, maintain good electrical continuity at the joint, effectively suppress electromagnetic wave leakage, and ensure the integrity of the continuous conductive shielding surface.

[0088] The inner moisture-absorbing and expanding resin layer, with an expansion rate ≥15% when the ambient humidity exceeds 60%, allows the resin to automatically fill the joint deformation gaps caused by humidity changes, preventing electromagnetic shielding loopholes due to physical deformation. It also provides a sealing and waterproofing function, preventing moisture intrusion from affecting the shielding system's performance. During installation, the composite conductive strip is pre-compressed by 20%-25%, ensuring a tight fit between the strip and the joint in the initial state while allowing space for subsequent expansion. This structural design achieves a dual function of physical sealing and electrical connection, effectively solving the problem of reduced shielding effectiveness at joints due to environmental factors in traditional shielding structures. It significantly improves the reliability and stability of building wall electromagnetic shielding systems under different environmental conditions, making it particularly suitable for building projects in complex environments such as those with large humidity variations or outdoor environments.

[0089] In this embodiment, the keel frame 1 is equipped with a dynamic stress monitoring system. The dynamic stress monitoring system includes multiple strain gauge sensors installed in the connection gap between the main keel 4 and the secondary keel. The multiple strain gauge sensors are arranged in a matrix with a 200mm interval in cooperation with the keel frame 1. The strain gauge sensors feed back the stress changes at the connection gap between the main keel 4 and the secondary keel to an external monitoring terminal in the form of electrical signals.

[0090] In practical use, a dynamic stress monitoring system is installed in the keel frame 1, providing real-time monitoring and early warning capabilities for the safety and stability of the building wall's electromagnetic shielding structure. Multiple strain gauge sensors are installed in a matrix at 200mm intervals at the connection gaps between the main keel 4 and the secondary keel, enabling comprehensive and accurate capture of stress changes in the keel frame 1 during construction and use. As the supporting structure of the shielding system, the keel frame 1 must withstand the loads of the shielding plate, equipment weight, and environmental forces over a long period. Stress concentration is prone to occur at the connection gaps, making it difficult to monitor its stress state in real time using traditional construction methods.

[0091] This monitoring system converts stress changes into electrical signals using strain gauge sensors and feeds them back to an external monitoring terminal in real time. Engineers can then obtain timely information on the mechanical state of the keel structure. If abnormal stress fluctuations occur or exceed preset thresholds, the system can quickly pinpoint the specific weak points and implement timely reinforcement measures to prevent shielding system failure due to keel structure damage, effectively preventing safety accidents. Furthermore, the system provides data support for building maintenance and management. By monitoring stress change trends over a long period, it assesses the fatigue level and service life of the keel frame 1, allowing for advance maintenance planning, extending the overall service life of the electromagnetic shielding project, reducing later maintenance costs, and achieving intelligent and scientific management of the building wall electromagnetic shielding structure throughout its entire lifecycle from construction to use.

[0092] In this embodiment, before the keel frame 1 is erected in S1, a laser projection positioning device is used to project a cross laser grid onto the wall and the ground. Optical reflective targets are preset on the main keel 4 and the secondary keel. The keel frame 1 is erected by comparing the relative positions of the optical reflective targets and the cross laser grid. The diameter of the optical reflective targets is 5mm, and the positioning accuracy is ±0.1mm. The laser grid spacing error is ≤0.3mm / m, so that the overall installation accuracy of the keel frame 1 reaches ±0.5mm.

[0093] In actual use, the laser projection positioning device projects a cross-shaped laser grid onto the wall and floor. Combined with pre-set 5mm diameter optical reflective targets on the main keel 4 and secondary keels, the keel installation is performed by comparing their relative positions. The positioning accuracy can reach ±0.1mm, and the laser grid spacing error is controlled within ≤0.3mm / m, ultimately achieving an overall installation accuracy of ±0.5mm for the keel frame 1. Compared to traditional manual measurement and layout methods, this technology significantly reduces human error and ensures the accuracy and consistency of the installation positions of each component of the keel frame 1.

[0094] High-precision keel installation ensures a perfect fit between subsequent shielding panels, shielding doors, and other components and the keel frame 1, avoiding problems such as excessive shielding gaps and loose connections caused by installation deviations. This effectively improves the integrity and shielding performance of the continuous conductive shielding surface. Furthermore, precise positioning helps improve construction efficiency, reduces rework and material waste due to positional deviations, and lowers construction costs. Simultaneously, this high-precision construction technology provides a guarantee for the standardized and regulated construction of building wall electromagnetic shielding projects, making project quality easier to control and evaluate. It is particularly suitable for locations with extremely high electromagnetic shielding performance requirements, such as high-precision laboratories and data centers, ensuring that the building ultimately meets stringent electromagnetic environment standards.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An electromagnetic shielding method for building walls, characterized in that: Includes the following steps: S1. Determine the axis and lay out the center line and edge line of the wall based on the axis; lay an insulating board on the floor and build a keel frame (1) according to the laying position. The keel frame (1) is installed and fixed to the wall and ceiling through insulating parts (2); the keel frame (1) is electrically isolated from the main building through the insulating board and insulating parts (2). S2. An opening (3) is made in the keel frame (1) for installing shielding doors and shielding windows, and a shielding plate is installed on the ground insulation board and the keel frame (1); a conductive liner is provided at the connection gap between the keel frame (1), the shielding plate, the shielding door and the shielding window, and the conductive liner makes each shielding structure form a continuous conductive shielding surface.

2. The electromagnetic shielding method for building walls according to claim 1, characterized in that: The keel frame (1) is provided with an opening (3) for installing waveguides. The waveguides include a return air waveguide for guiding indoor air backflow, an air intake waveguide for introducing outdoor fresh air, and an emergency exhaust waveguide for emergency linkage and rapid exhaust. A conductive liner is provided between the waveguide and the opening (3) so that the waveguide and each shielding structure form a continuous conductive shielding surface.

3. The electromagnetic shielding method for building walls according to claim 1, characterized in that: The keel frame (1) includes a main keel (4) installed on an insulating board, a wall secondary keel (5) installed on the main keel (4), and a ceiling secondary keel (6). The insulating component (2) includes an insulating corner piece (7) and an insulating hanger (8). The insulating corner piece (7) is used to connect the wall to the wall secondary keel (5), and the insulating hanger (8) is used to connect the ceiling to the ceiling secondary keel (6).

4. The electromagnetic shielding method for building walls according to claim 1, characterized in that: The wall sub-keel (5) is fitted with a fireproof board (9) by self-tapping screws. The fixing point of the self-tapping screws is located on the wall sub-keel (5) and does not contact the shielding plate. Glass fiber cotton (11) is filled between the fireproof board (9) and the shielding plate. The glass fiber cotton (11) does not contact the conductive liner.

5. The electromagnetic shielding method for building walls according to claim 2, characterized in that: The keel frame (1) is provided with an opening (3) for installing the quench pipe. The quench pipe is welded to the shielding plate at the top by gas shielded welding-argon arc welding, and the quench pipe protrudes from the opening (3) and extends to the outside of the wall at least 5 meters above the ground.

6. The electromagnetic shielding method for building walls according to claim 1, characterized in that: Multiple layers of conductive lining are bent at the inside and outside corners of each shielding structure and at the inside and outside corners where the shielding structures are connected. The multiple layers of conductive lining are bonded together with conductive adhesive.

7. The electromagnetic shielding method for building walls according to claim 1, characterized in that: The ceiling secondary keel (6) and wall secondary keel (5) each contain multiple load-bearing keels, which are arranged in an interval matrix on the main keel (4).

8. The electromagnetic shielding method for building walls according to claim 1, characterized in that: The keel frame (1) is provided with holes for assembling filters. The shielding plate is provided with receiving holes in accordance with the holes. The filter passes through the receiving holes and its wires extend into the shielding chamber formed by the shielding plate and are connected to the circuit in the shielding chamber. The filter and the shielding plate are electrically connected by a conductive bushing, which together form a continuous conductive shielding surface.

9. The electromagnetic shielding method for building walls according to claim 2, characterized in that: The shielding plate is equipped with a non-magnetic aluminum duct, which has an air outlet and an air inlet. The air inlet is connected to the air inlet waveguide, return air waveguide and emergency exhaust waveguide through an interface with a conductive sealing structure. The outer surface of the non-magnetic aluminum duct is electrically bonded to the shielding plate through a conductive liner. The waveguide cutoff characteristics are used to block electromagnetic leakage and work together to maintain the electromagnetic shielding effectiveness of the building wall.

10. The electromagnetic shielding method for building walls according to claim 1, characterized in that: Includes the following steps: S3. After completing steps S1 and S2, use a magnetic shielding testing device to test the full-band shielding effectiveness of the magnetic shielding space formed by the continuous conductive shielding surface to verify whether its shielding effect meets the standards. After passing the test, proceed with the construction of the remaining building components. During the construction process, ensure that the newly added components are electrically isolated from the magnetic shielding space or that the continuity of electromagnetic shielding is achieved through conductive lining.

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