Steel structure engineering roof and wall photovoltaic power station construction method

Abstract

The application discloses a construction method for a steel structure engineering roof and wall photovoltaic power station, and construction steps are as follows: S1. preliminary preparation and deepening design; S2. material transportation and roof protection; S3. support system installation; S4. photovoltaic tile installation; S5. structure glue sealing and cover plate installation; S6. photovoltaic module and electrical system installation; S7. system debugging and grid connection. The application breaks through the traditional single roof photovoltaic or roof and wall photovoltaic separation construction mode, and through systematic integration design and construction process, not only fully excavates the photovoltaic utilization potential of the building roof and wall, but also solves the industry pain points such as difficult wall photovoltaic construction, poor roof and wall photovoltaic connection and the like through technical means such as integrated support frame construction, waterproof sealing treatment and electrical system integration, significantly improves the overall utilization efficiency and engineering reliability of the photovoltaic system on the building envelope structure, and provides new technical support for diversified and efficient application of the distributed photovoltaic system.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology for building envelope structures, and in particular to a construction method for photovoltaic power stations on the roof and walls of steel structure projects. Background Technology

[0002] In the face of a escalating global energy crisis and increasingly severe environmental pollution, the development and utilization of renewable energy has become a common choice for the international community. Solar energy, as a significant representative of clean and renewable energy, boasts substantial advantages such as wide distribution and sustainable resource utilization. Distributed photovoltaic (PV) power generation systems, by arranging PV modules in idle spaces such as building rooftops, can directly convert solar energy into electricity. This not only effectively alleviates the pressure on the power grid but also reduces dependence on fossil fuels and greenhouse gas emissions, playing a vital role in ecological environmental protection and energy structure optimization.

[0003] Currently, the mainstream application of distributed photovoltaic (PV) systems involves placing PV modules solely on building rooftops. This approach is primarily based on factors such as excellent rooftop sunlight conditions, no need for additional land use, relatively mature technology, and convenient installation, making it practical for single-roof PV development scenarios. However, this model has significant technical limitations and shortcomings: First, it generally ignores the large facade space resources of building exteriors, resulting in the failure to maximize PV energy utilization efficiency and wasting the PV potential of the building envelope; second, it does not consider the coordinated development of rooftop and wall-mounted PV, failing to meet the current development needs of building-integrated photovoltaics (BIPV).

[0004] Meanwhile, existing external wall photovoltaic (PV) technologies and engineering practices have several shortcomings: On the one hand, when external wall PV systems are promoted independently, they face problems such as high technical complexity, lack of standardized construction processes, and easy interference with indoor lighting; on the other hand, existing rooftop and wall-mounted PV systems are mostly designed and constructed independently, lacking integrated technical solutions and construction standards. This leads to structural instability, waterproofing and sealing failures, and messy electrical connections at the junctions, resulting in numerous quality hazards. Furthermore, the construction processes are often conflicting and inefficient, leading to high maintenance costs. In addition, some existing construction technologies are poorly adaptable to different types of steel structure buildings, making it difficult to flexibly adjust to the specific structural characteristics of roofs and walls, further limiting the comprehensive promotion and application of PV technology in building envelopes. Summary of the Invention

[0005] The present invention aims to address the shortcomings of the prior art by providing a construction method for photovoltaic power stations on the roof and walls of steel structure engineering.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A construction method for a photovoltaic power station on the roof and walls of a steel structure project, the construction steps of which are as follows:

[0008] S1. Preliminary preparation and detailed design: On-site survey of the roof and walls of the steel structure building to confirm the panel type, structural condition and obstacle location, and optimize the arrangement of photovoltaic modules and calculate the load based on the measurement data;

[0009] S2. Material transportation and roof protection: Transport construction materials to the work surface and lay protective boards or wooden planks in the roof work area to distribute the construction load;

[0010] S3. Bracket System Installation: Based on the detailed design, position and lay out the lines. Lay out the installation center lines of all guide rails one by one according to the control lines. Install photovoltaic-specific purlins on the roof and walls to form a unified support frame. Lay DC cables, install the roof photovoltaic-specific bottom strips, and correct their verticality. Apply butyl tape to the bottom of the roof supports for waterproof sealing.

[0011] S4. Photovoltaic tile installation: Install photovoltaic tiles on the purlins of the roof and walls in sequence. The roof is installed by two people working together, while the walls are installed from bottom to top using an aerial work platform for transportation, and the installation gaps and flatness are controlled.

[0012] S5. Structural adhesive sealing and cover plate installation: Apply neutral silicone structural sealant to the splicing seams between photovoltaic tiles and where cables pass through, and then install windproof covers or deflectors;

[0013] S6. Photovoltaic module and electrical system installation: Install photovoltaic modules in a neat arrangement along the guide rails on the installed photovoltaic tile structure from top to bottom, and carry out string connection, wiring fixation, combiner box installation and grounding system construction to ensure that the grounding resistance of all guide rails and module frames is ≤4Ω;

[0014] S7. System Commissioning and Grid Connection: Conduct insulation resistance testing, polarity testing, and system commissioning to ultimately achieve safe grid connection and power generation of the photovoltaic power station.

[0015] The installation of the wall-mounted photovoltaic purlins in the bracket system installation process requires two people to work together. One person operates the self-tapping screws, while the other person adjusts the position of the purlins to ensure levelness. The self-tapping screws of the roof photovoltaic purlins are driven vertically into the roof panel from the crest and penetrate the main structural purlins below.

[0016] The specific steps for waterproof sealing with butyl tape are as follows: Before applying the tape, thoroughly clean the area under the support base and the roof panel area where the butyl tape will be applied with a clean cloth or brush to ensure that there is no dust, oil, or moisture. When applying the tape, after removing the release paper, apply the tape flatly to the predetermined position under the support base, and press it firmly with your hand or a rubber roller to ensure that the tape is completely adhered to the metal surface without air bubbles or wrinkles.

[0017] When installing roof photovoltaic tiles, align the mounting holes on the photovoltaic tile frame with the preset positions on the guide rail, use the specified component clamps and bolts for initial fixing, and adjust the gap between the photovoltaic tiles to be controlled at 2-3mm to accommodate thermal expansion and contraction.

[0018] When installing wall-mounted photovoltaic tiles, use self-tapping screws to fix the photovoltaic tiles to the purlins. The fixing spacing of the self-tapping screws should be ≤1m, and the distance from the edge of the tile should meet the specifications.

[0019] When laying the DC cable, the DC cable needs to be cut and numbered according to the design dimensions. For the MC4 connector, first use wire strippers to strip the insulation layer of an appropriate length from the end of the cable, then use wire crimping pliers to crimp the connector core, and finally insert the connector core into the MC4 head and tighten it with a special wrench. The cable is laid along the guide rail and fixed with stainless steel cable ties, with a allowance for deformation.

[0020] During the construction of the grounding system, all guide rails and photovoltaic module frames are connected in series with grounding wires and reliably connected to the main roof structure or existing lightning protection strip through special metal roof clamps to ensure that the grounding resistance value is ≤4Ω and to ensure the safety of the system's lightning protection grounding.

[0021] In the preliminary preparation and detailed design steps, a customized component layout design needs to be carried out based on the measured peak height, peak spacing, panel specifications, and wall dimensions of the metal roof panels, avoiding obstacles such as skylights and ventilators, and a structural engineer should be commissioned to calculate the roof load-bearing capacity.

[0022] In the material transportation and roof protection steps, materials are transported by a combination of crane lifting and manual handling, and protective boards or wooden boards are laid in the roof operation area to distribute the load and prevent damage to the roof panels.

[0023] The positioning and laying out process must ensure that the guide rail spacing error is controlled within ±5mm, and the verticality deviation of the lower strip is controlled within ≤2mm / m.

[0024] The beneficial effects of this invention are as follows: This invention breaks through the traditional construction mode of single rooftop photovoltaic or separate rooftop and wall photovoltaic. By systematically integrating the design and construction process, it not only fully explores the photovoltaic utilization potential of building rooftops and walls, but also solves industry pain points such as difficult construction of external wall photovoltaic and poor connection between rooftop and wall photovoltaic through integrated support frame construction, waterproof sealing treatment, electrical system integration and other technical means. It significantly improves the overall utilization efficiency and engineering reliability of photovoltaic systems on building envelope structures, and provides new technical support for the diversified and efficient application of distributed photovoltaic systems. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the roof purlin installation according to the present invention;

[0026] Figure 2 This is a schematic diagram of the installation of the roof photovoltaic tile according to the present invention;

[0027] Figure 3 This is a cross-sectional view of the roof photovoltaic tile installation of the present invention;

[0028] Figure 4 This is a diagram showing the arrangement of wall purlins according to the present invention;

[0029] Figure 5 This is a diagram of the wall-mounted photovoltaic wiring of the present invention;

[0030] Figure 6 This is a layout diagram of the wall-mounted photovoltaic tiles of the present invention;

[0031] Figure 7 This is an enlarged schematic diagram of the wall-mounted photovoltaic installation of the present invention;

[0032] In the diagram: 1-Angle-seam aluminum-magnesium-manganese roofing sheet; 2-Purlin; 3-Butyl tape; 4-Bottom edge strip; 5-Photovoltaic tile; 6-Structural sealant; 7-Windproof cover; 8-Return box;

[0033] The following will describe in detail, with reference to the accompanying drawings, embodiments of the invention. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0035] A construction method for a photovoltaic power station on the roof and walls of a steel structure project, the construction steps of which are as follows:

[0036] S1. Preliminary preparation and detailed design: On-site survey of the roof and walls of the steel structure building to confirm the panel type, structural condition and obstacle location, and optimize the arrangement of photovoltaic modules and calculate the load based on the measurement data;

[0037] Panel type confirmation: Based on the actual working conditions measured on site, professional measuring tools are used to accurately measure the crest height, crest spacing, panel type specifications and wall dimensions of the metal roof panel to carry out customized component layout design, avoiding obstacles such as skylights and ventilators, and a structural engineer is commissioned to calculate the roof load-bearing capacity;

[0038] Roof and wall condition inspection: Conduct a comprehensive inspection of the integrity of roof panels, wall panels, sealant, and all fasteners, focusing on the presence of rust, deformation, damage, aging, and other issues. If any quality defects are found, professional repairs must be carried out first. Only after passing the inspection can the next step of photovoltaic module installation proceed.

[0039] Obstacle location: Detailed identification of the specific location and size of obstacles such as skylights, ventilators, skylights, ridges, and eaves on the building roof and walls, providing a basis for photovoltaic array layout planning, ensuring that photovoltaic module installation avoids the area affected by obstacles, and avoiding shading that leads to a decrease in power generation efficiency;

[0040] Component layout optimization: Based on the actual dimensions of the installation surface and the distribution of obstacles, combined with the technical parameters of the photovoltaic modules, the optimal layout design of the photovoltaic modules is carried out. While ensuring that shadow interference is avoided, the space of the building roof and walls is maximized to improve the overall power generation capacity of the photovoltaic array.

[0041] Load calculation: A qualified structural engineer will be commissioned to accurately calculate the roof structure's load-bearing capacity based on key parameters such as the photovoltaic system's own weight (dead load) and local annual wind load, ensuring that the roof structure can meet the safety requirements for the installation and long-term operation of the photovoltaic system. If the load-bearing capacity is insufficient, a special reinforcement plan must be developed.

[0042] S2. Material Transportation and Roof Protection: Materials will be transported using a combination of crane lifting and manual handling. Construction materials such as photovoltaic modules, purlins 2, bottom edge strips 4, and cables will be lifted in batches and in an orderly manner to the designated storage locations on the work surface. Protective boards or wooden planks will be laid on the roof work area to distribute the construction load and prevent damage to the roof panels caused by personnel stepping on them or materials being piled up. During transportation, materials must be handled with care to avoid collision damage.

[0043] S3. Bracket System Installation: Based on the detailed design, position and lay out the lines. Lay out the installation center lines of all guide rails one by one according to the control lines. Install photovoltaic-specific purlins 2 on the angle-seam aluminum-magnesium-manganese tiles 1 on the roof and walls to form a unified support frame. Lay DC cables, install the roof photovoltaic-specific bottom strips 4, and correct their verticality. Apply butyl tape 3 to the bottom of the roof support for waterproof sealing.

[0044] Positioning and layout: 1) The construction supervisor needs to check the design drawings again to clarify the layout and spacing parameters of the guide rails, as well as the safe distance between the guide rails and obstacles such as roof edges, skylights, and chimneys, to ensure that the design requirements are consistent with the actual working conditions on site;

[0045] 2) Select key reference points such as the roof ridge and eaves as benchmarks, and first mark out key control lines such as the center line and starting edge line; using a calibrated laser rangefinder, theodolite, and chalk line tool, mark out the installation center lines of all guide rails one by one according to the control lines. The following requirements must be met during the marking process:

[0046] a. All layout lines should be parallel or perpendicular to the ridge line, and can be checked in real time using a laser level to ensure line accuracy;

[0047] b. The guide rail spacing shall be strictly implemented according to the design dimensions in the drawings, with the error controlled within ±5mm;

[0048] c. Mark the endpoints, intersections, and other key locations of the lines with a marker and indicate the corresponding component numbers to facilitate subsequent installation work;

[0049] Install photovoltaic purlins: Lay photovoltaic purlins 2 according to the positions determined by the layout lines. Self-tapping screws must be driven vertically from the crest of the roof panel and ensure that they penetrate the main structural purlins 2 below. It is strictly forbidden to drive them into the trough or non-structural support positions to ensure the firmness of the purlin 2 installation.

[0050] The installation of wall purlin 2 requires two people to work together. One person is responsible for driving the self-tapping screws, and the other person adjusts the position of purlin 2 to ensure that purlin 2 is installed horizontally and meets the design requirements.

[0051] DC cable laying: Based on the dimensions in the design drawings and the actual distance from the BIPV output terminal to the inverter on site, cut and configure cables of corresponding lengths, and make sequential numbers to avoid wiring confusion;

[0052] To install the MC4 connector: First, use wire strippers to remove the insulation layer of an appropriate length from the end of the cable. Then, use wire crimping pliers to crimp the connector core. Finally, insert the connector core into the MC4 connector and tighten it with a special wrench to ensure a reliable connection.

[0053] After the MC4 wiring is completed, the cable should be placed in a designated location for later use to avoid damage to the cable or affecting subsequent construction.

[0054] Install bottom edge strips: Establish a stable support frame on the roof or in systems where tilt adjustment is required.

[0055] Before installing the lower strip 4, check its specifications, length and surface treatment (such as galvanized layer) to ensure they are intact and free from rust, deformation and other quality problems.

[0056] Fix the bottom of the lower strip 4 to the installed base or pedestal, and use a spirit level to check its verticality (in both directions) to ensure that the deviation is controlled within the allowable range of ≤2mm / m;

[0057] Use stainless steel bolts to secure the lower strip 4 to the base, and equip it with spring washers or lock nuts as required to prevent the connection from loosening; after the connection is completed, check the overall frame stability to ensure that there is no shaking.

[0058] Applying butyl tape: The core function of butyl tape 3 is to form a reliable waterproof barrier at the contact point between the support and the roof, enhancing the waterproof performance of the system. When the support is fixed and pressed onto the roof with screws, butyl tape 3 will be squeezed to form a sealed waterproof ring.

[0059] Before applying the tape, use a clean cloth or brush to thoroughly clean the area under the support base and the roof panel area where the butyl tape 3 is to be applied, ensuring that there are no dust, oil, moisture or other impurities to avoid affecting the application results.

[0060] Cut butyl tape 3 to an appropriate length according to the shape and size of the support base; after removing the release paper, stick the butyl tape 3 flatly to the predetermined position under the support base, press it fully with your hand or a rubber roller to ensure that the butyl tape 3 is completely adhered to the metal surface without bubbles or wrinkles.

[0061] S4. Photovoltaic tile installation: Install photovoltaic tiles 5 on purlins 2 on the roof and walls in sequence. The roof is installed by two people working together, and the walls are installed from bottom to top using a high-altitude work vehicle for transportation, while controlling the installation gap and flatness.

[0062] Roof photovoltaic tile installation: Two or more construction workers should work together to carefully lift the photovoltaic tile 5 onto the guide rail, handling it gently to avoid collisions that could damage the photovoltaic tile 5.

[0063] Align the mounting holes on the frame of the photovoltaic tile with the preset positions on the guide rail, and use the specified component clamps and bolts for initial fixing. Do not tighten them all at once, leaving room for subsequent fine-tuning.

[0064] Adjust the gap between the photovoltaic tiles (usually controlled at 2-3mm) to accommodate thermal expansion and contraction caused by temperature changes. Use a special caliper to ensure that the gap is uniform. At the same time, check the flatness of the entire photovoltaic tile array to ensure that it meets the installation standards.

[0065] Wall-mounted photovoltaic tile installation: The wall-mounted photovoltaic tile 5 is installed in a bottom-up construction sequence. An aerial work platform is used to transport the photovoltaic tile 5 to the installation position and accurately place it on the purlin 2.

[0066] After confirming that the position of photovoltaic tile 5 is correct, use self-tapping screws to fix it to purlin 2. The fixing spacing of the self-tapping screws must be strictly controlled within 1 meter, and the distance from the edge of the tile must meet the relevant specifications.

[0067] Install the subsequent photovoltaic tiles 5 in sequence, ensuring that the joints between the tiles are tight and uniform. If electrical connections are involved, ensure that the connections are correct and reliable. During the installation process, use a spirit level to check the flatness of the photovoltaic tiles 5 at any time to avoid misalignment or warping.

[0068] S5. Structural adhesive sealing and cover plate installation: Apply neutral silicone structural sealant 6 to the splicing seams between photovoltaic tiles 5 and the cable crossings, and then install windproof cover plate 7 or deflector plate;

[0069] Structural sealant 6 is mainly used for sealing gaps formed after the junction box connectors between photovoltaic tiles 5 are plugged in, as well as small gaps where cables pass through guide rails or roofs.

[0070] After the photovoltaic panel 5 is installed and firmly bonded to the corrugated board, and the adhesive layer is dry, the edge strip adhesive can be applied to the photovoltaic tile 5. First, apply sealant along the junction of the lower edge strip 4 and the photovoltaic tile 5. Before the adhesive layer dries, fasten the windproof cover 7.

[0071] Neutral silicone structural sealant 6 is selected, which is required to have good weather resistance, elasticity and adhesion. Before applying the sealant, clean the surface to be sealed, use a glue gun to apply the sealant evenly and continuously, and ensure that the structural sealant 6 completely covers the gap. Then, use your hand or a scraper to smooth the sealant joint, making it smooth, beautiful and free of bubbles.

[0072] Cover plate installation: Install end caps at both ends of the guide rail or cable tray to prevent foreign objects and rainwater from entering the interior; install windproof covers 7 or deflectors around the array to optimize the wind load stress of the system and improve the overall aesthetics.

[0073] S6. Photovoltaic module and electrical system installation: On the installed photovoltaic tile 5 structure, arrange the photovoltaic modules from top to bottom along the guide rails and install them in an orderly manner. Perform string connection, wiring fixation, return box 8 installation and grounding system construction to ensure that the grounding resistance of all guide rails and module frames is ≤4Ω.

[0074] Photovoltaic module installation: Starting from the leeward side (usually from the ridge towards the eaves), arrange the photovoltaic modules from top to bottom along the guide rail to ensure that the modules are arranged neatly; use the module side pressure blocks or middle pressure blocks to press down the module frame and fasten the pressure blocks to the guide rail with bolts to ensure that all pressure blocks are fastened in place, but the tightening force must be controlled to avoid excessive pressure that may cause the photovoltaic module glass to crack;

[0075] Electrical system installation: 1) String connection: Connect the photovoltaic modules in series according to the number of modules required by the design through the MC4 plug to form a power generation string, ensuring correct wiring and good contact;

[0076] 2) Wiring and fixing: DC cables are laid along the guide rail or the pre-set route on the roof and fixed with stainless steel cable ties or special cable fixing brackets to prevent the cables from dangling and swaying; a certain amount of slack is reserved during the cable laying process to adapt to environmental deformation and later maintenance needs.

[0077] 3) Combiner box installation: Install combiner box 8 in a well-ventilated and easily accessible location (usually fixed using a support column). Connect each string of cables to combiner box 8 according to the design requirements, ensuring that the wiring is secure and the markings are clear.

[0078] 4) Grounding system construction: Connect all guide rails and photovoltaic module frames in series with grounding wires, and reliably connect them to the main roof structure or existing lightning protection strip through grounding clamps (special metal roof clamps) to ensure that the grounding resistance value meets the specifications (usually ≤4Ω) and ensure the safety of the system's lightning protection grounding.

[0079] S7. System Commissioning and Grid Connection: Conduct insulation resistance testing, polarity testing, and system commissioning to ultimately achieve safe grid connection and power generation of the photovoltaic power station.

[0080] 1) Inspection and testing: Conduct a comprehensive inspection of all electrical connections to ensure they are secure and reliable, with no looseness or intermittent connections; perform insulation resistance and polarity tests on the system to ensure that all electrical performance indicators meet grid connection requirements;

[0081] 2) Grid connection and commissioning: Professional electricians work with relevant personnel from the power grid company to complete the inverter commissioning, system parameter configuration and other tasks, and finally realize the safe grid connection and power generation of the photovoltaic power station.

[0082] In the description of the invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0084] In this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] The invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution, or direct application to other situations without modification, are all within the scope of protection of the invention.

Claims

1. A construction method for a photovoltaic power station on the roof and walls of a steel structure project, characterized in that, The construction steps are as follows: S1. Preliminary preparation and detailed design: On-site survey of the roof and walls of the steel structure building to confirm the panel type, structural condition and obstacle location, and optimize the arrangement of photovoltaic modules and calculate the load based on the measurement data; S2. Material transportation and roof protection: Transport construction materials to the work surface and lay protective boards or wooden boards in the roof work area to distribute the construction load; S3. Bracket system installation: Positioning and layout are carried out according to the detailed design. The installation center lines of all guide rails are laid out one by one according to the control lines. Photovoltaic purlins (2) are installed on the corrugated roof and wall to form a unified support frame. DC cables are laid, and the roof photovoltaic bottom strip (4) is installed and its verticality is corrected. Butyl tape (3) is pasted on the bottom of the roof support for waterproof sealing. S4. Photovoltaic tile installation: Install photovoltaic tiles (5) on the purlins (2) of the roof and the wall in sequence. The roof is installed by two people working together, and the wall is installed from bottom to top by using a high-altitude work vehicle for transportation. Control the installation gap and flatness. S5. Structural sealant sealing and cover plate installation: Apply neutral silicone structural sealant (6) to the splice seams between photovoltaic tiles (5) and where cables pass through, and then install windproof cover plates (7) or deflector plates; S6. Photovoltaic module and electrical system installation: On the installed photovoltaic tile structure, arrange the photovoltaic modules from top to bottom along the guide rails, install them in a neat arrangement, connect the strings, fix the wiring, install the combiner box (8) and construct the grounding system, and ensure that the grounding resistance of all guide rails and module frames is ≤4Ω; S7. System Commissioning and Grid Connection: Conduct insulation resistance testing, polarity testing, and system commissioning to ultimately achieve safe grid connection and power generation of the photovoltaic power station.

2. The construction method for a steel structure roof and wall photovoltaic power station according to claim 1, characterized in that, The installation of the wall photovoltaic purlin (2) in the bracket system installation steps requires two people to work together. One person operates the self-tapping screws, and the other person adjusts the position of the purlin (2) to ensure the levelness. The self-tapping screws of the roof photovoltaic purlin (2) are driven vertically from the crest of the roof panel and penetrate the main structural purlin (2) below.

3. The construction method for a steel structure roof and wall photovoltaic power station according to claim 2, characterized in that, The specific steps for waterproof sealing with butyl tape (3): Before pasting, use a clean cloth or brush to thoroughly clean the area of ​​the roof panel below the support base and where the butyl tape (3) is to be pasted, to ensure that there is no dust, oil, or moisture; when pasting, after peeling off the release paper, paste the butyl tape (3) flatly on the predetermined position below the support base, press it fully with your hand or a rubber roller to ensure that the tape is completely adhered to the metal surface without bubbles or wrinkles.

4. The construction method for a steel structure roof and wall photovoltaic power station according to claim 3, characterized in that, When installing the roof photovoltaic tile (5), align the mounting holes on the frame of the photovoltaic tile (5) with the preset position on the guide rail, use the specified component pressure block and bolts for initial fixing, and adjust the gap between the photovoltaic tiles (5) to be controlled at 2-3mm to accommodate thermal expansion and contraction; When installing the wall-mounted photovoltaic tile (5), use self-tapping screws to fix the photovoltaic tile (5) to the purlin (2). The fixing spacing of the self-tapping screws should be ≤1m, and the distance from the edge of the tile should meet the requirements of the specification.

5. The construction method for a steel structure roof and wall photovoltaic power station according to claim 4, characterized in that, When laying the DC cable, the DC cable needs to be cut and numbered according to the design dimensions. For the MC4 connector, first use wire strippers to strip the insulation layer of an appropriate length from the end of the cable, then use wire crimping pliers to crimp the connector core, and finally insert the connector core into the MC4 head and tighten it with a special wrench. The cable is laid along the guide rail and fixed with stainless steel cable ties, with a allowance for deformation.

6. The construction method for a steel structure roof and wall photovoltaic power station according to claim 5, characterized in that, During the construction of the grounding system, all guide rails and photovoltaic module frames are connected in series with grounding wires and reliably connected to the main roof structure or existing lightning protection strip through special metal roof clamps to ensure that the grounding resistance value is ≤4Ω and to ensure the safety of the system's lightning protection grounding.

7. The construction method for a steel structure roof and wall photovoltaic power station according to claim 6, characterized in that, In the preliminary preparation and detailed design steps, a customized component layout design needs to be carried out based on the measured peak height, peak spacing, panel specifications, and wall dimensions of the metal roof panels, avoiding obstacles such as skylights and ventilators, and a structural engineer should be commissioned to calculate the roof load-bearing capacity.

8. The construction method for a steel structure roof and wall photovoltaic power station according to claim 7, characterized in that, In the material transportation and roof protection steps, materials are transported by a combination of crane lifting and manual handling, and protective boards or wooden boards are laid in the roof operation area to distribute the load and prevent damage to the roof panels.

9. The construction method for a steel structure roof and wall photovoltaic power station according to claim 8, characterized in that, The positioning and laying out process must ensure that the guide rail spacing error is controlled within ±5mm, and the verticality deviation of the lower strip is controlled within ≤2mm / m.

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