Distributed photovoltaic construction method based on steel structure building roof

Abstract

The invention relates to the technical field of building construction, in particular to a distributed photovoltaic construction method based on a steel structure building roof. The distributed photovoltaic construction method comprises the following steps that firstly, roof investigation and pretreatment are conducted; step 2, surveying, setting out and positioning; thirdly, the hoop assembly is prefabricated; fourthly, a limiting groove is constructed; step 5, mounting a hoop assembly; sixthly, supporting wingceltis strips are installed; step 7, installing a photovoltaic module; 8, electrical wiring and lightning protection grounding are carried out; and 9, debugging and detecting the system. The limiting groove matched with the plane size of the hoop assembly is formed in the fireproof coating layer on the surface of the I-shaped steel, circumferential limiting is formed on the hoop assembly through the inner wall of the limiting groove, and the sliding trend of the hoop assembly in the length direction of the I-shaped steel is effectively limited; therefore, the transverse shear resistance and torsion resistance of the connection of the hoop and the I-shaped steel are remarkably improved, and the overall stability of the photovoltaic support is enhanced.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for constructing distributed photovoltaic systems on the roof of a steel structure building. Background Technology

[0002] Building-integrated photovoltaics (BIPV) and distributed photovoltaic power generation systems are increasingly being used in new and existing buildings. Steel structure roofs, due to their advantages such as lightweight structure, high load-bearing capacity, and short construction period, have become an important carrier for the installation of distributed photovoltaic systems.

[0003] Currently, for steel structure roofs using I-beams as the main load-bearing components, photovoltaic (PV) brackets are typically installed using clamp connections. This method involves the left and right halves of the clamp fitting together and wrapping around the outer flange of the I-beam. Pre-tightening force is applied using bolts, ensuring a tight fit between the inner wall of the clamp and the surface of the I-beam. The friction generated at the contact surface supports the weight of the PV modules and external loads. Compared to traditional welding connections, clamp connections avoid the safety risks of high-altitude welding operations, eliminate the damage to the anti-corrosion coating on the steel surface caused by the heat-affected zone of welding, and offer a degree of detachability, facilitating later maintenance and system upgrades.

[0004] However, in practical engineering applications, the clamp can only make effective contact with the flange of the I-beam, and there is a large gap between it and the web of the I-beam. This causes the clamp to easily slide along the length of the I-beam when subjected to lateral shear force or torque, affecting the overall stability of the photovoltaic support.

[0005] Therefore, how to prevent the clamp from sliding along the length of the I-beam and improve the stability of the connection between the clamp and the I-beam is a technical problem that urgently needs to be solved in the existing technology. Summary of the Invention

[0006] The purpose of this invention is to address the problem in existing technologies where the clamps can only make effective contact with the flanges of the I-beam, leaving a large gap between them and the web of the I-beam. This causes the clamps to easily slide along the length of the I-beam when subjected to lateral shear force or torque, affecting the overall stability of the photovoltaic support system. The invention provides a distributed photovoltaic construction method based on the roof of a steel structure building.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for constructing distributed photovoltaic systems on the roof of a steel structure building includes the following steps: Step 1: Roof Inspection and Pre-treatment: Conduct a comprehensive inspection of the steel structure roof to confirm that there is no damage or leakage, and remove debris; then use digital tools to collect roof structural parameters, establish a 3D model of the roof, and plan the layout of photovoltaic modules according to the design drawings and the 3D model to determine the installation position and spacing of the photovoltaic brackets. Step 2, Measurement, Layout and Positioning: Based on the photovoltaic module layout design drawings, use measuring instruments to lay out lines on the I-beams on the roof to determine the coordinates of the photovoltaic bracket installation points; Step 3: Prefabrication of clamp assembly: According to the specifications and model of the I-beam, prefabricate the clamp assembly that matches it; the clamp assembly includes a left clamp and a right clamp, and the base plate of the left clamp and the right clamp is provided with a fixing wing plate. The fixing wing plate is provided with fastening bolts, and the left clamp and the right clamp can be combined into an integral structure by means of the fastening bolts. Step 4: Constructing the limiting groove: A limiting groove is made on the fireproof coating layer at the preset installation position on the surface of the I-beam. The depth of the limiting groove is the same as the thickness of the fireproof coating layer, and the planar dimensions of the limiting groove match the planar dimensions of the clamp assembly. Step 5, Clamp assembly installation: Embed the clamp assembly into the limiting groove, and use the inner wall of the limiting groove to form a circumferential limit on the clamp assembly; Step 6: Install the supporting purlins: Vertically install the supporting rods on the top of the clamp assembly, and connect the supporting purlins to the supporting rods to form a frame structure that supports the photovoltaic modules; Step 7, Photovoltaic module installation: Lay the photovoltaic modules on the frame structure formed by the supporting purlins, and fix the photovoltaic modules to the supporting purlins with clamps and bolts; Step 8, Electrical Wiring and Lightning Protection Grounding: Complete the string wiring between photovoltaic modules and connect the supporting purlins to the roof lightning protection system to form an equipotential bond; Step 9: System Debugging and Testing: Debug the photovoltaic system and test its electrical parameters.

[0008] Preferably, the top plates of the left and right halves of the clamp are provided with abutment plates, which are inserted into the internal cavity of the support rod. The abutment plates can be fitted into the inner wall of the support rod by adjusting the gap between the left and right halves of the clamp by the fastening bolts.

[0009] Preferably, the left and right halves of the clamp are further provided with first abutting bolts, which are inclined and used to abut against the bottom surface of the upper flange of the I-beam; the top of the left and right halves of the clamp are further provided with second abutting bolts, which are used to abut against the top surface of the upper flange of the I-beam.

[0010] Preferably, after the I-beams are connected, the clamp assembly has a gap between its top and bottom plates and the plane of the flange of the I-beam.

[0011] Preferably, after the I-beams are connected, the side plate of the clamp assembly is fitted with the side edge of the lower flange of the I-beam.

[0012] Preferably, the contact points between the left and right halves of the clamp and the side edge of the lower flange of the I-beam are provided with elastic rubber pads.

[0013] Preferably, the support rod is connected to the clamp assembly by welding.

[0014] Preferably, the connection between the support rod and the clamp assembly is provided with a reinforcing rib, which is welded and fixed to the outer wall of the support rod and the top plate of the clamp assembly respectively.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention discloses a distributed photovoltaic construction method based on a steel structure building roof. By opening a limiting groove on the fireproof coating layer on the surface of the I-beam that matches the planar dimensions of the clamp assembly, the inner wall of the limiting groove forms a circumferential limiting on the clamp assembly, effectively restricting the sliding tendency of the clamp assembly along the length direction of the I-beam. This significantly improves the lateral shear resistance and torsional performance of the connection between the clamp and the I-beam, and enhances the overall stability of the photovoltaic support. 2. The distributed photovoltaic construction method based on a steel structure building roof described in this invention utilizes the synergistic effect of the second and first abutment bolts to form a bidirectional clamping of the upper flange of the I-beam, further enhancing the tightness of the connection between the clamp assembly and the I-beam. Furthermore, the clamping force of the first and second abutment bolts effectively counteracts the upward or downward displacement tendency of the clamp assembly when bearing the weight of the photovoltaic modules and wind loads, further consolidating the connection stability between the clamp assembly and the I-beam and preventing loosening due to vibration or load changes during long-term use. On the other hand, in the operation of adjusting the interval between the left half clamp and the right half clamp by means of the fastening bolt, the upper flange of the I-beam is first clamped by the second abutting bolt and the first abutting bolt, which can limit the relative position of the left half clamp and the right half clamp. This avoids the two from shifting or misaligning during the tightening of the fastening bolt, and improves the stability and ease of operation of the pre-connection between the support rod and the clamp assembly. Furthermore, by adjusting the screw-in depth of the first and second abutment bolts, the system can accommodate upper flanges of I-beams of varying thicknesses, thus improving the versatility and installation adaptability of the clamp assembly. Moreover, by adjusting the extension length of the second abutment bolt, the mounting plane height of the clamp assembly on the I-beam can be fine-tuned, ensuring that multiple clamp assemblies are on the same plane, thus guaranteeing the horizontal installation of the subsequent support purlins. 3. The distributed photovoltaic construction method based on a steel structure building roof described in this invention, by maintaining a gap, ensures that the clamping force of the clamping assembly on the I-beam is mainly concentrated at the contact points of the first and second abutment bolts. This reduces the friction area of ​​the contact surface, not only lowering the probability of wear on the anti-corrosion coating but also preventing coating damage and substrate exposure caused by minor displacement. Furthermore, by leaving a gap between the contact surfaces of the clamping assembly and the I-beam, natural airflow is promoted at the limiting groove, reducing moisture accumulation within the limiting groove and lowering the risk of corrosion of the I-beam and the clamping assembly. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating a distributed photovoltaic construction method based on the roof of a steel structure building. Figure 2 This is a schematic diagram of the clamp assembly embedded in the limiting groove; Figure 3 This is a structural schematic diagram of the clamp assembly.

[0017] The markings in the diagram are: 1-Clamping assembly, 2-Limiting groove, 3-Left half clamp, 4-Right half clamp, 5-Fixing wing plate, 6-Fastening bolt, 7-Abutting plate, 8-First abutting bolt, 9-Second abutting bolt, 10-Elastic rubber pad, 11-Reinforcing rib, 12-Supporting rod, 13-Photovoltaic module. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] Example 1 like Figure 1 and Figure 2 As shown, the distributed photovoltaic construction method based on a steel structure building roof according to the present invention includes the following steps: Step 1: Roof Inspection and Pre-treatment: Conduct a comprehensive inspection of the steel structure roof to confirm that there is no damage or leakage, and remove debris; use digital tools to collect roof structural parameters, establish a 3D model of the roof, and plan the arrangement of photovoltaic modules 13 according to the design drawings and 3D model to determine the installation position and spacing of photovoltaic brackets. Step 2, Measurement, Layout and Positioning: Based on the photovoltaic module 13 layout design drawings, use measuring instruments to lay out lines on the I-beams on the roof to determine the coordinates of the photovoltaic bracket installation points; Step 3: Prefabrication of clamp assembly: According to the specifications and model of the I-beam, prefabricate the clamp assembly that matches it; the clamp assembly includes a left half clamp 3 and a right half clamp 4. The base plate of the left half clamp 3 and the right half clamp 4 is provided with a fixing wing plate 5. The fixing wing plate 5 is provided with fastening bolts 6. The fastening bolts 6 can be used to combine the left half clamp 3 and the right half clamp 4 into an integral structure. Step 4, Construction of limiting groove 2: A limiting groove 2 is made on the fireproof coating layer at the preset installation position on the surface of the I-beam. The depth of the limiting groove 2 is the same as the thickness of the fireproof coating layer, and the planar dimensions of the limiting groove 2 match the planar dimensions of the clamp assembly. Step 5: Clamp assembly installation: Embed the clamp assembly into the limiting groove 2, and use the inner wall of the limiting groove 2 to form a circumferential limit on the clamp assembly; Step 6: Install the supporting purlin: Vertically install the supporting rod 12 on the top of the clamp assembly, and connect the supporting purlin to the supporting rod 12 to form a frame structure supporting the photovoltaic module 13; Step 7, Photovoltaic module 13 installation: Install photovoltaic modules 13 on the frame structure formed by the supporting purlins, and fix the photovoltaic modules 13 to the supporting purlins by clamps and bolts; Step 8, Electrical Wiring and Lightning Protection Grounding: Complete the string wiring between photovoltaic modules 13, and connect the supporting purlins to the roof lightning protection system to form an equipotential bond; Step 9: System Debugging and Testing: Debug the photovoltaic system and test its electrical parameters.

[0021] The distributed photovoltaic construction method based on a steel structure building roof described in this invention involves creating a limiting groove 2 on the fireproof coating layer of the I-beam surface that matches the planar dimensions of the clamp assembly. The inner wall of the limiting groove 2 forms a circumferential limit on the clamp assembly, effectively restricting the sliding tendency of the clamp assembly along the length of the I-beam. This significantly improves the lateral shear resistance and torsional performance of the connection between the clamp and the I-beam, enhancing the overall stability of the photovoltaic support.

[0022] Specifically, the inspection of the steel structure roof in this embodiment includes: first, checking for any damage or leaks on the roof surface; if any are found requiring repair, the superior unit should be notified immediately. Before construction, all debris on the roof surface, especially nails, steel bars, and other debris, must be removed. After the site is cleared, the construction worker, using equipment such as a theodolite, level, measuring tape, and marker, will lay out the lines on-site, confirming the location of the monocrystalline silicon modules and the location of the support points on the steel structure, in accordance with the design drawings. After confirming the support points, the fireproof coating layer is removed at the support points to form the limiting groove 2 structure, according to the drawing requirements. The limiting groove 2 should be cut using a special cutting tool to ensure that the groove edges are flat and to avoid damage to the I-beam body. Before embedding the clamp assembly into the limiting groove 2, the inner wall of the limiting groove 2 and the surface of the clamp assembly must be cleaned to remove dust, oil, and other impurities.

[0023] The specific construction details for photovoltaic module 13 are as follows: This embodiment uses a 550W monocrystalline silicon module, with 15 modules connected in a string inverter; the string inverter is mounted on the wall. The PV1-F1x4 photovoltaic-specific cable is used between the strings of monocrystalline silicon modules and the inverter, and the WDZ-YJY-0.6 / 1kV power cable is used to connect the inverter to the grid-connected cabinet. The strings connected to the same inverter should be concentrated near the inverter as much as possible to reduce the number of connecting wires and reduce losses. On-site construction can be adapted according to the actual situation. When mounted on a bracket, the connecting wires between them should be listed in this project.

[0024] The specific details of electrical wiring and lightning protection grounding construction are as follows: ① When connecting via the lead wires that come with the monocrystalline silicon module, the positive and negative terminals of the lead wires of the array must be marked in the electrical connection at this location; ② Photovoltaic cables should be laid through cable trays; direct sunlight exposure should be avoided as much as possible. ③ The serial numbers of each string and the inverter number must be the same as the numbers on the design drawings; ④ Connect the male and female plugs. Use a special crimping tool to crimp the photovoltaic wire on the male connector, and then connect it to the female plug. ⑤ When wiring MC cables, pay attention to the "+" and "-" terminals. For series connections: "+" to "-", and for parallel connections: "+" to "+", "-" to "-". Different colored wires should be used for the positive (red), negative (blue), and series connections. ⑥ The line number and loop number should be clearly marked, and the output end of the square array should have obvious polarity markings and sub-square array number markings; ⑦ When wiring in sunlight, be careful not to touch the positive and negative terminals of the components at the same time to avoid electric shock. If necessary, cover the components with an opaque material before wiring. When laying and wiring MC cables, work should be carried out in the area covered by one junction box. That is, only after the cable laying and wiring of the area covered by one junction box is completed can the work be carried out in the area covered by the next junction box.

[0025] ⑧ A spare length should be left near the cable termination and joint.

[0026] Example 2 like Figure 3 As shown, the present invention provides a distributed photovoltaic construction method based on a steel structure building roof. Further, based on the above method, the top plates of the left half-clamp 3 and the right half-clamp 4 are provided with opposing abutment plates 7. The abutment plates 7 are inserted into the internal cavity of the support rod 12, and the spacing between the left half-clamp 3 and the right half-clamp 4 can be adjusted by the fastening bolts 6, so that the abutment plates 7 fit snugly against the inner wall of the support rod 12.

[0027] In this embodiment, by adjusting the fastening bolts 6 to move the left half of the clamp 3 and the right half of the clamp 4 away from each other, the abutment plate 7 is driven to tightly fit against the inner wall of the support rod 12. This not only achieves rapid positioning and initial fixation of the clamp assembly and the support rod 12, but also further restricts the sliding of the clamp assembly through the friction between the abutment plate 7 and the inner wall of the support rod 12. At the same time, this plug-in fit method also enhances the overall rigidity of the connection between the two, so that the load of the photovoltaic module 13 borne by the support rod 12 can be more evenly transferred to the clamp assembly, reducing the risk of connection failure caused by local stress concentration.

[0028] Example 3 like Figure 2 and Figure 3 As shown, the distributed photovoltaic construction method based on the roof of a steel structure building according to the present invention further includes, on the basis of the above method, a first abutting bolt 8 is provided on the side of the left half clamp 3 and the right half clamp 4. The first abutting bolt 8 is inclined and is used to abut against the bottom surface of the upper flange of the I-beam. A second abutting bolt 9 is also provided on the top of the left half clamp 3 and the right half clamp 4. The second abutting bolt 9 is used to abut against the top surface of the upper flange of the I-beam.

[0029] Specifically, in this embodiment, after connecting the clamp assembly to the I-beam, the bottom end of the second abutment bolt 9 is first tightened to abut the top surface of the upper flange of the I-beam. Then, the inclined first abutment bolt 8 is tightened so that its end abuts the bottom surface of the upper flange of the I-beam. The synergistic effect of the second abutment bolt 9 and the first abutment bolt 8 forms a bidirectional clamping effect on the upper flange of the I-beam, which further improves the tightness of the connection between the clamp assembly and the I-beam. Furthermore, the clamping force of the first abutment bolt 8 and the second abutment bolt 9 can effectively counteract the upward or downward displacement tendency of the clamp assembly when bearing the weight of the photovoltaic module 13 and wind load, further consolidating the connection stability between the clamp assembly and the I-beam and preventing loosening due to vibration or load changes during long-term use.

[0030] On the other hand, in the operation of adjusting the interval between the left half clamp 3 and the right half clamp 4 by means of the fastening bolt 6, the upper flange of the I-beam is first clamped by the second abutting bolt 9 and the first abutting bolt 8, which can limit the relative position of the left half clamp 3 and the right half clamp 4. This avoids the two from shifting or misaligning during the tightening of the fastening bolt 6, and improves the stability and ease of operation of the pre-connection between the support rod 12 and the clamp assembly.

[0031] Furthermore, by adjusting the screw-in depth of the first abutting bolt 8 and the second abutting bolt 9 in this embodiment, it is possible to adapt to upper flanges of I-beams of different thicknesses, thereby improving the versatility and installation adaptability of the clamp assembly of the present invention. Moreover, by adjusting the extension length of the second abutting bolt 9, the mounting plane height of the clamp assembly on the I-beam can be fine-tuned, ensuring that multiple clamp assemblies are in the same plane, thus providing a guarantee for the subsequent horizontal installation of the supporting purlins.

[0032] As a preferred embodiment, based on the above method, the clamp assembly further includes a gap between its top and bottom plates and the plane of the flange of the I-beam after the I-beam is connected.

[0033] In this embodiment, it is considered that in traditional tight-fitting installations, the rigid contact surface between the clamp and the I-beam is prone to fretting wear due to thermal expansion and contraction or wind-induced vibration, which can damage the anti-corrosion layer on the steel surface. This embodiment, by maintaining a gap, ensures that the clamping force of the clamp assembly on the I-beam is mainly concentrated at the contact points of the first abutting bolt 8 and the second abutting bolt 9. This reduces the friction area of ​​the contact surface, not only lowering the probability of anti-corrosion coating wear but also preventing coating damage and substrate exposure caused by minute displacement. Furthermore, by leaving a gap between the contact surfaces of the clamp assembly and the I-beam, natural airflow can be promoted in the limiting groove 2, reducing moisture accumulation within the limiting groove 2 and lowering the risk of corrosion of the I-beam and the clamp assembly.

[0034] As a preferred embodiment, based on the above method, the side plate of the clamp assembly is further fitted with the side edge of the lower flange of the I-beam after the I-beam is connected.

[0035] In the above embodiment, adjusting the spacing between the left half-clamp 3 and the right half-clamp 4 using the fastening bolt 6 to ensure the abutment plate 7 fits against the inner wall of the support rod 12 may cause a gap to form between the side plate of the clamp assembly and the side edge of the lower flange of the I-beam, thus affecting the lateral stability of the overall connection. Therefore, this embodiment uses the method of tightening the fastening bolt 6 to cause elastic deformation of the side plate of the clamp assembly, allowing it to fit tightly against the side edge of the lower flange of the I-beam. This effectively limits the lateral displacement of the clamp assembly and ensures a stable lateral constraint between it and the I-beam. Simultaneously, the tight fit between the side plate of the clamp assembly and the side edge of the lower flange of the I-beam provides an additional support point for the entire clamp assembly, allowing for a more even load distribution, reducing local stress concentration, and extending the service life of the clamp assembly.

[0036] Furthermore, in this embodiment, when the side plate of the clamp assembly undergoes elastic deformation, an upward force is applied to the first abutting bolt 8, which further enhances the abutting force of the first abutting bolt 8 against the bottom surface of the upper flange of the I-beam, thereby increasing the overall preload of the connection between the clamp assembly and the I-beam.

[0037] As a preferred embodiment, based on the above method, an elastic rubber pad 10 is further provided at the contact points between the left half-clamp 3 and the right half-clamp 4 and the side edge of the lower flange of the I-beam. This structural arrangement transforms the hard contact between the clamp assembly side plate and the side edge of the lower flange of the I-beam into a flexible contact. Through the deformation capability of the elastic rubber pad 10, it effectively buffers the impact force generated by wind loads or equipment vibrations during the operation of the photovoltaic system, reducing squeezing damage to the side edge of the lower flange of the I-beam, and also enhances the friction between the clamp assembly and the I-beam, further improving the stability of the connection.

[0038] Example 4 like Figure 3 As shown, the distributed photovoltaic construction method based on the roof of a steel structure building according to the present invention further includes, on the basis of the above method, the support rod 12 and the clamp assembly are connected by welding.

[0039] As a preferred embodiment, based on the above method, a reinforcing rib 11 is further provided at the connection between the support rod 12 and the clamp assembly. The reinforcing rib 11 is welded and fixed to the outer wall of the support rod 12 and the top plate of the clamp assembly, respectively. This structural arrangement significantly enhances the structural strength and rigidity of the connection between the support rod 12 and the clamp assembly. Specifically, the reinforcing rib 11, through double-sided welding to the outer wall of the support rod 12 and the top plate of the clamp assembly, forms a stable triangular support structure, effectively dispersing the vertical and horizontal loads transmitted from the photovoltaic module 13 to the clamp assembly through the support rod 12, and reducing the risk of deformation or weld detachment cracking at the connection due to stress concentration.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for constructing distributed photovoltaic systems on the roof of a steel structure building, characterized in that, Includes the following steps: Step 1: Roof Inspection and Pre-treatment: Conduct a comprehensive inspection of the steel structure roof to confirm that there is no damage or leakage, and remove debris; then use digital tools to collect roof structural parameters, establish a 3D model of the roof, and plan the layout of photovoltaic modules according to the design drawings and the 3D model to determine the installation position and spacing of the photovoltaic brackets. Step 2, Measurement, Layout and Positioning: Based on the photovoltaic module layout design drawings, use measuring instruments to lay out lines on the I-beams on the roof to determine the coordinates of the photovoltaic bracket installation points; Step 3: Prefabrication of clamp assembly: According to the specifications and model of the I-beam, prefabricate the clamp assembly that matches it; the clamp assembly includes a left clamp and a right clamp, and the base plate of the left clamp and the right clamp is provided with a fixing wing plate. The fixing wing plate is provided with fastening bolts, and the left clamp and the right clamp can be combined into an integral structure by means of the fastening bolts. Step 4: Constructing the limiting groove: A limiting groove is made on the fireproof coating layer at the preset installation position on the surface of the I-beam. The depth of the limiting groove is the same as the thickness of the fireproof coating layer, and the planar dimensions of the limiting groove match the planar dimensions of the clamp assembly. Step 5, Clamp assembly installation: Embed the clamp assembly into the limiting groove, and use the inner wall of the limiting groove to form a circumferential limit on the clamp assembly; Step 6: Install the supporting purlins: Vertically install the supporting rods on the top of the clamp assembly, and connect the supporting purlins to the supporting rods to form a frame structure that supports the photovoltaic modules; Step 7, Photovoltaic module installation: Lay the photovoltaic modules on the frame structure formed by the supporting purlins, and fix the photovoltaic modules to the supporting purlins with clamps and bolts; Step 8, Electrical Wiring and Lightning Protection Grounding: Complete the string wiring between photovoltaic modules and connect the supporting purlins to the roof lightning protection system to form an equipotential bond; Step 9: System Debugging and Testing: Debug the photovoltaic system and test its electrical parameters.

2. The method for constructing distributed photovoltaic systems based on steel structure building roofs according to claim 1, characterized in that, The top plates of the left and right halves of the clamp are provided with abutment plates, which are inserted into the internal cavity of the support rod. The spacing between the left and right halves of the clamp can be adjusted by the fastening bolts so that the abutment plates fit against the inner wall of the support rod.

3. The distributed photovoltaic construction method based on a steel structure building roof according to claim 2, characterized in that, The left and right halves of the clamp are also provided with first abutting bolts on their sides. The first abutting bolts are inclined and are used to abut against the bottom surface of the upper flange of the I-beam. The top of the left and right halves of the clamp are also provided with second abutting bolts, which are used to abut against the top surface of the upper flange of the I-beam.

4. The method for constructing distributed photovoltaic systems based on steel structure building roofs according to claim 3, characterized in that, After the I-beams are connected, the clamp assembly has a gap between its top and bottom plates and the plane of the flange of the I-beam.

5. The distributed photovoltaic construction method based on a steel structure building roof according to claim 4, characterized in that, After the I-beams are connected, the side plate of the clamp assembly is fitted with the side edge of the lower flange of the I-beam.

6. The method for constructing distributed photovoltaic systems based on steel structure building roofs according to claim 5, characterized in that, The left and right halves of the clamp are provided with elastic rubber pads at the contact points with the side edge of the lower flange of the I-beam.

7. The method for constructing distributed photovoltaic systems based on steel structure building roofs according to claim 6, characterized in that, The support rod is connected to the clamp assembly by welding.

8. The method for constructing distributed photovoltaic systems based on steel structure building roofs according to claim 7, characterized in that, The connection between the support rod and the clamp assembly is provided with a reinforcing rib, which is welded and fixed to the outer wall of the support rod and the top plate of the clamp assembly respectively.

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