Integral maintenance method for large-span steel truss roof and operation platform thereof

Abstract

The present application relates to a kind of large-span steel truss roof integral maintenance method and its hanging operation platform, the operation platform includes the double-row suspension scaffold upright of symmetrical distribution in the steel truss span direction at both sides of steel truss, upright upper end is set on the steel truss top chord beam section by the horizontal steel pipe above steel truss, purlin upper steel pipe and roof purlin cross and are fixed by two sides fastener hoop steel pipe connection, bottom full-paved steel wire mesh is equipped with waist steel pipe outer package safety green net in four quarters, along steel truss and is drawn long life rope;The method includes the modularization hanging erection operation platform along the span direction of steel truss, sets up double safety redundancy, carries out integral polishing derusting and anticorrosive coating in platform vestibule, and the steps such as modularization removal turnover to next section are carried out.The present application solves the problem of large-span steel truss roof high clearance, site limited conditions under integral maintenance, with safe and reliable, operation surface is big, turnover efficiency is high, and the advantages such as remarkable advantage of cost reduction and efficiency increase.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a suspended work platform for the overall maintenance of steel truss roofs of large-span stadiums or industrial plants, and a method for performing overall roof maintenance using this work platform. Background Technology

[0002] Large-span stadiums or industrial plant steel truss roofs often require maintenance and replacement of components such as roof corrugated steel panels, purlins, tie rods, and horizontal supports due to years of disrepair or salt spray corrosion. The steel trusses also need grinding, rust removal, and recoating for corrosion protection, resulting in a significant workload. Given the high clearance and inherent danger of steel truss roofs, maintenance work is challenging. Providing workers with a safe, reliable, and easily accessible operating platform is crucial for the successful implementation of overall roof maintenance.

[0003] Traditional steel structure roof maintenance mainly adopts the following two methods: The first method is a simple manual hanging basket. Two sets of hanging baskets are used alternately, suspended from the steel roof truss or roof purlins, and can be manually removed and suspended. This method is convenient to construct, but it is physically demanding for workers and is only suitable for small-area maintenance and replacement of steel roofs. For large areas of steel roofs that require grinding, rust removal, or anti-corrosion coating, the working surface of the hanging basket is small, the efficiency is low, and it requires frequent high-altitude changes of the suspension position, which is not very safe.

[0004] The second option is to erect full-span scaffolding under the steel roof. However, full-span scaffolding serves as a work platform for workers, resulting in a large workload and high costs for labor, steel pipes, and other reusable materials, making it uneconomical. For large steel roofs, it needs to be erected and dismantled in sections and multiple times, leading to frequent turnovers and low construction efficiency. Furthermore, the area beneath the steel structure roof of a stadium is typically a sloping grandstand with prefabricated seating; the uneven terrain makes full-span scaffolding difficult to erect and would also occupy space below, affecting other construction processes. Summary of the Invention

[0005] This invention aims to overcome the shortcomings of the prior art and provide a method for overall maintenance of large-span steel truss roofs and its operating platform. It solves the technical problems in the overall maintenance of large-span steel truss roofs, such as the difficulty in erecting full-span scaffolding due to the limited roof clearance and site, and the small operating surface and poor safety of simple manual hanging baskets due to frequent turnover.

[0006] To solve the above-mentioned technical problems, the present invention is implemented as follows: A large-span steel truss roof-mounted suspended work platform includes double rows of suspended scaffolding uprights arranged symmetrically on both sides of the steel truss span, and steel pipes above purlins connecting the uprights on the same side and horizontal bars connecting the uprights on both sides. The upper ends of the suspended scaffolding uprights are supported on the upper chord beam section of the steel truss via the horizontal steel pipes above the steel truss. The steel pipes above the purlins are arranged in a cross shape with the roof purlins and are fixed to the roof purlins by fasteners on both sides. The steel pipes fixed by the fasteners on both sides are wrapped around the roof purlins and locked with fasteners, so that the steel pipes above the purlins and the roof purlins form a tight connection that is anti-slip and anti-detachment. A bottom full-covered steel wire mesh is formed between the double rows of suspended scaffolding uprights. The bottom full-covered steel wire mesh is surrounded by waist-protecting steel pipes wrapped with safety green netting, and a continuous life rope is stretched along the steel truss.

[0007] Furthermore, the horizontal steel pipe above the steel truss is directly erected on the upper surface of the upper chord beam section of the truss. The steel pipe above the purlin and the cross intersection of the roof purlin are provided with the two-sided fastener clamps to fix the steel pipe. In this way, the self-weight of the suspended work platform and the construction load are transferred to the existing steel structure of the roof through the suspension support of the upper chord beam section of the truss and the lateral fixing point of the roof purlin. This avoids the suspension frame from longitudinally slipping on the sloping roof and from falling off under strong wind loads.

[0008] Furthermore, the connection between the uprights of the suspended scaffold and the steel pipes and horizontal bars above the purlins is provided with anti-slip double fasteners at the ends of the uprights. The anti-slip double fasteners at the ends of the uprights include two swivel fasteners arranged side by side at the connection node between the uprights and horizontal bars of the suspended scaffold, or an anti-detachment pin and a spare nut are added to the single fastener. Both the upper and lower ends of the suspended scaffold uprights are exposed by no less than 150mm, thereby preventing slippage caused by the loosening of the single fastener due to long-term stress and ensuring the safety of workers on the working surface.

[0009] Furthermore, the bottom is fully covered with and fixed with wire mesh, and a kickboard is provided below or around the bottom of the wire mesh. The safety green netting wrapped around the waist guard steel pipe is vertically spaced along the height of the suspended scaffold uprights, with the spacing between adjacent waist guard steel pipes wrapped with safety green netting not exceeding 600mm. The lifeline is a continuous steel wire rope, which is fixed to the steel truss by rope clamps or special anchors. It is used to maintain the safety belts of the workers and ensure that the safety belts are hung high and used low, serving as a secondary insurance for high-altitude operations.

[0010] Furthermore, the length of the suspended scaffold uprights is 100cm greater than the height of the steel truss, the bottom is fully covered with wire mesh 50cm lower than the lower chord, the longitudinal spacing of the double-row suspended scaffold uprights is 1.8m and the transverse spacing is 1.8m, and a pedestrian passage of not less than 600mm is reserved between the two sides of the suspended scaffold uprights, thereby forming sufficient maintenance and operation space under the lower chord and meeting the needs of personnel passage and material transportation.

[0011] A method for the overall maintenance of large-span steel truss roofs, employing the suspended work platform described above, addresses the technical problems of high cost of traditional full-span scaffolding, low efficiency of simple hanging baskets, and insufficient safety when large-span steel truss roofs require grinding, rust removal, and anti-corrosion coating of color steel plates, roof purlins, tie rods, and the entire steel truss due to years of disrepair or salt spray corrosion. This method combines modular suspended erection along the span of the steel truss with segmented and continuous operation, achieving the goals of reducing material input, improving maintenance efficiency, and ensuring the safety of personnel working at height. The method includes the following steps: Step 1: Along the span of the steel truss, arrange double rows of suspended scaffolding uprights symmetrically on both sides of the steel truss. Lay the horizontal steel pipes above the steel truss on the upper chord beam section of the steel truss. Arrange the steel pipes above the purlins and the roof purlins in a cross shape and fix the steel pipes to the roof purlins with fasteners on both sides to form a suspended work platform frame. Step 2: Install anti-slip double fasteners at the connection between the uprights and horizontal bars of the suspended scaffolding, fully lay wire mesh at the bottom and install waist-protecting steel pipes wrapped with safety green netting, and stretch a continuous life rope along the steel truss to form a closed operating platform corridor with double safety redundancy. Step 3: Workers enter the operating platform corridor to perform overall grinding, rust removal, and anti-corrosion coating maintenance on the lower chord, tie rods, horizontal supports, and roof purlins of the steel truss; Step 4: After the maintenance of this work section is completed, the modular suspended work platform is dismantled and moved to the next work section. Steps 1 to 3 are repeated until the overall maintenance of the entire roof is completed.

[0012] Furthermore, in step 1, the longitudinal spacing of the double-row suspended scaffold uprights is 1.8m, the transverse spacing is 1.8m, and a pedestrian passage of not less than 600mm is reserved between the two sides of the suspended scaffold uprights. The horizontal steel pipe above the steel truss is adjusted in position according to the width of the main beam of the truss. The steel pipes on both sides are fixed by fasteners around the roof purlins and then locked by fasteners, so that the steel pipes above the purlins and the roof purlins form a tight connection that is anti-slip and anti-detachment, thereby transferring the load of the working platform to the existing steel structure of the roof.

[0013] Furthermore, in step 2, the end of the upright is provided with anti-slip double fasteners, including two swivel fasteners arranged side by side at the connection node between the upright and the horizontal bar of the suspended scaffold, or an anti-detachment pin and a spare nut are added on the basis of a single fastener. The upper and lower ends of the suspended scaffold upright are exposed by no less than 150mm. The waist-protecting steel pipe is wrapped with a safety green net at vertical intervals of no more than 600mm. The bottom is fully covered with wire mesh and has a kickboard with a height of no less than 200mm. The lifeline is a continuous steel wire rope, which is fixed to the steel truss by rope clamps or special anchors, and is used for workers to fasten their safety belts and ensure that the rope is used at a high position.

[0014] Furthermore, in step 3, the suspended work platform between two adjacent steel trusses is connected to form a trestle bridge by steel pipes and horizontal bars above the purlins, forming a continuous enclosed work platform corridor. Workers can carry out maintenance work on the horizontal tie rods, support components and steel trusses inside the trestle bridge. At the same time, a horizontal safety net is set up below the work platform, thereby effectively reducing the fear of working at height and preventing falling objects.

[0015] Furthermore, in step 4, the modular dismantling is carried out in the following order: first, dismantle the life rope and the safety green net covering the waist protection steel pipe; then, dismantle the bottom full-covered wire mesh and kickboard; and finally, dismantle the steel pipe above the purlin and the suspended scaffold uprights. The dismantled steel pipes, fasteners and wire mesh are hoisted to the next work section as a whole, with a reuse rate of more than 80%, thereby significantly reducing the amount of turnover materials and labor input, improving turnover efficiency and shortening the construction period.

[0016] The beneficial effects of this invention are as follows: As can be seen from the above technical solution, this application provides a method for overall maintenance of a large-span steel truss roof and its working platform. It utilizes the existing steel truss structure of the roof as a suspension support point, and adopts symmetrical double-row suspended scaffolding to form a continuous operating corridor. This eliminates the need for full-span scaffolding on the ground, effectively solving the problem of erecting an operating platform under conditions of high clearance and limited space, and significantly saving on the amount of turnover materials such as steel pipes and fasteners, as well as labor input. By combining the erection of the horizontal steel pipes above the steel truss with the upper chord beam section of the truss, and the fixing of the steel pipes above the purlins with the fasteners on both sides of the roof purlins, a double suspension and lateral fixing system is formed, avoiding the need for suspension... The system mitigates the risks of longitudinal slippage and detachment under strong wind loads when mounted on sloping roofs. Multiple safety redundancies are implemented, including anti-slip double fasteners at the ends of the uprights, lifelines along the steel truss, a full-coverage of wire mesh at the bottom, and a safety green net covering the waist-protecting steel pipes. This significantly improves the safety of high-altitude operations. The operating platform corridor provides a much larger operating surface and activity space than a simple hanging basket, allowing workers to perform overall maintenance on the horizontal tie rods, supports, and steel trusses within the continuous trestle bridge, greatly improving the efficiency of grinding, rust removal, and anti-corrosion coating. The modular installation and dismantling method ensures high material turnover efficiency and saves construction time, making it particularly suitable for projects with short construction periods and in underdeveloped construction markets. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the installation of the suspended work platform of the present invention (including enlarged views of node 1 and node 2). Figure 2 This is a side elevation view of the suspended work platform arranged along the steel truss of the present invention.

[0018] In the diagram: 2-Truss upper chord beam section; 4-Suspended scaffold upright; 5-Horizontal steel pipe above the steel truss; 6-Steel pipe above the purlin; 8-Roof purlin; 11-Anti-slip double fastener at the end of the upright; 15-Steel pipe clamp node above the purlin; 16-Bottom fully covered with wire mesh; 17-Toeboard; 18-Safety green netting wrapped around the waist-protecting steel pipe; 19-Lifeline strung along the truss; 22-Anti-slip double fastener at the bottom of the upright. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application. like Figure 1 As shown: A suspended work platform for a large-span steel truss roof, which is suspended and installed under the steel truss roof of a large-span stadium or industrial plant for overall roof maintenance work.

[0020] The suspended work platform includes double rows of suspended scaffold uprights 4 arranged symmetrically on both sides of the steel truss span, as well as steel pipes 6 above the purlins connecting the suspended scaffold uprights 4 on the same side and transverse steel pipes connecting the suspended scaffold uprights 4 on both sides. The suspended scaffold uprights 4 are standard steel pipe scaffold uprights, with a length greater than the height of the steel truss by 100cm. This ensures that the bottom fully covered with wire mesh 16 is approximately 50cm lower than the lower chord, thus creating sufficient maintenance and operation space below the lower chord for workers to perform grinding, rust removal, and anti-corrosion coating on the lower chord, tie rods, and horizontal supports.

[0021] The upper end of the suspended scaffold upright 4 is supported on the upper chord beam section 2 of the steel truss via the upper horizontal steel pipe 5. The upper horizontal steel pipe 5 rests directly on the upper surface of the upper chord beam section 2, using the upper chord beam section 2 as the main suspension point for the work platform, transferring the platform's self-weight and construction load to the steel truss. The placement of the upper horizontal steel pipe 5 can be adjusted according to the width of the main truss beam to ensure that the overlap length meets the stress requirements.

[0022] The steel pipe 6 above the purlin is arranged in a cross shape with the roof purlin, and is fixed to the roof purlin 8 by fasteners on both sides. For example... Figure 1As shown, the steel pipes secured by fasteners on both sides encircle the roof purlin 8 and are locked together with fasteners, forming a cross-shaped, secure connection between the steel pipe 6 above the purlin and the roof purlin 8. These fasteners are installed at each intersection point between the steel pipe 6 above the purlin and the roof purlin 8, thereby transferring the lateral load of the work platform to the roof purlin, preventing longitudinal slippage of the suspension frame on the sloping roof, resisting horizontal forces under strong wind loads, and preventing the platform from detaching.

[0023] like Figure 1 As shown in node two, the connection between the suspended scaffold upright 4 and the steel pipe 6 above the purlin and the horizontal steel pipe is provided with anti-slip double couplers 11 at the end of the upright. The anti-slip double couplers 11 at the end of the upright include two swivel couplers arranged side-by-side at the connection node between the suspended scaffold upright 4 and the horizontal bar, or an anti-loosening pin and a spare nut added to a single swivel coupler. The two swivel couplers arranged side-by-side are fastened with double nuts, so even if one coupler becomes slightly loose due to prolonged stress, the other coupler can still maintain the connection strength; the anti-loosening pin passes through the gap between the coupler cover plate and the suspended scaffold upright 4, and the spare nut is tightened at the end of the coupler bolt to prevent the nut from falling back. Both the upper and lower ends of the suspended scaffold upright 4 are exposed by at least 150mm to allow for observation of coupler slippage and to provide operating space for emergency reinforcement.

[0024] A bottom-covered wire mesh panel 16 is formed between the double-row suspended scaffold uprights 4. The bottom-covered wire mesh panel 16 is made of welded wire mesh or steel plate mesh, with a mesh size not exceeding 50mm×50mm. It is fixed to the steel pipe 6 above the purlins and the horizontal steel pipes by binding with wire or special clips. Kickboards 17 are provided around or below the bottom-covered wire mesh panel 16. The kickboards 17 are not less than 200mm high and are made of wood or steel plate to prevent tools and materials from falling from the edge of the working surface.

[0025] The bottom is fully covered with wire mesh 16, and safety green netting 18 wrapped around the perimeter is provided by steel pipes for waist protection. The safety green netting 18 is vertically spaced along the height of the suspended scaffold uprights 4, with a spacing of no more than 600mm between adjacent safety green netting 18. The safety green netting 18 is connected to the suspended scaffold uprights 4 using steel pipe couplers to form a continuous protective barrier. Inside the suspended work platform, a lifeline 19 is installed along the steel truss. The lifeline 19 is made of steel wire rope and is fixed to the upper chord beam section 2 of the steel truss using special anchors. It is arranged along the entire length of the work platform and is used to maintain the safety belts of workers, ensuring that the safety belts are attached high and used low, serving as a secondary safety measure for high-altitude operations.

[0026] The longitudinal spacing of the double-row suspended scaffolding uprights 4 is 1.8m, and the transverse spacing is 1.8m. A pedestrian passage of no less than 600mm is reserved between the two sides of the suspended scaffolding uprights 4 to meet the needs of personnel passage and small material transportation. The suspended work platform between two adjacent steel trusses is connected by steel pipes 6 above the purlins and transverse steel pipes to form a trestle, forming a continuous closed work platform corridor. Workers can move freely in the corridor and perform overall maintenance on the horizontal tie rods, supporting components and steel trusses without the need for frequent disassembly and relocation.

[0027] like Figure 2 As shown, the present invention also provides a method for overall maintenance of large-span steel truss roofs using the above-mentioned suspended working platform, comprising the following steps: Step 1: Along the span of the steel truss, arrange double rows of suspended scaffolding uprights 4 symmetrically on both sides of the steel truss, with a longitudinal spacing of 1.8m and a transverse spacing of 1.8m. Lay the horizontal steel pipes 5 above the steel truss on the upper chord beam section 2 of the steel truss. Arrange the steel pipes 6 above the purlins in a cross shape with the roof purlins. At each intersection, fix the steel pipes to the roof purlins 8 using fasteners on both sides. That is, fix the steel pipes around the roof purlins 8 using fasteners on both sides and then lock them with fasteners to form a suspended work platform frame. Leave a pedestrian passage of not less than 600mm between the suspended scaffolding uprights 4 on both sides.

[0028] Step 2: At the connection points between the suspended scaffold uprights 4 and the steel pipes 6 above the purlins and the horizontal steel pipes, install anti-slip double couplers 11 at the ends of the uprights. That is, install two swivel couplers side by side at each connection node, or add anti-detachment pins and spare nuts to the single swivel coupler, ensuring that the upper and lower ends of the suspended scaffold uprights 4 are exposed by no less than 150mm. Fully lay wire mesh 16 at the bottom and install toe boards 17 with a height of no less than 200mm. Install waist-protecting steel pipes wrapped with safety green netting 18 at vertical intervals of no more than 600mm along the suspended scaffold uprights 4. Secure lifelines 19 along the steel truss using special anchors to form a closed operating platform corridor with double safety redundancy.

[0029] Step 3: Workers, wearing safety harnesses and secured to the lifeline 19 stretched along the truss, enter the operating platform corridor. Utilizing the space 50cm below the lower chord of the steel truss, which is fully covered with wire mesh 16, the lower chord, tie rods, horizontal supports, and roof purlins are subjected to overall grinding, rust removal, and anti-corrosion coating maintenance. Platforms between adjacent steel trusses are connected by steel pipes 6 above the purlins and transverse steel pipes to form a trestle, allowing workers to work continuously within the trestle. Simultaneously, a horizontal safety net is installed below the operating platform to prevent falling objects and further reduce fear of working at heights.

[0030] Step 4: After the maintenance of this work section is completed, modular dismantling will proceed in the following order: first, dismantle the lifeline 19 along the truss and the safety green netting 18 wrapped around the waist-protecting steel pipes; then, dismantle the bottom full-covered wire mesh 16 and the kickboard 17; finally, dismantle the steel pipes 6 above the purlins, the horizontal steel pipes, and the suspended scaffold uprights 4. The dismantled steel pipes, fasteners, bottom full-covered wire mesh, and lifeline along the truss will be hoisted as a whole to the next work section, achieving a reuse rate of over 80%. This significantly reduces the amount of turnover materials and labor input, improves turnover efficiency, and shortens the construction period.

[0031] In this embodiment, since the existing steel truss structure of the roof is used as the suspension support, there is no need to erect full-scale scaffolding on the ground. This effectively solves the problem of limited space and difficulty in erecting full-scale scaffolding when the roof of a stadium or other building has a sloping grandstand with prefabricated seats. The suspended work platform has a spacious operating surface and can be connected to form a continuous trestle bridge. Compared with simple manual hanging baskets, it significantly improves work efficiency and safety, and is especially suitable for maintenance projects of large-area integral steel roofs.

[0032] The above are merely embodiments provided in this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A suspended work platform for large-span steel truss roofs, addressing the technical problems of difficult full-span scaffolding erection and poor safety of simple manual hanging baskets due to limited roof clearance and space constraints during the overall maintenance of large-span steel truss roofs in stadiums or industrial plants, which are caused by narrow operating surfaces and frequent turnover. The platform utilizes the existing steel truss structure of the roof as a suspension support point, forming a continuous operating corridor with symmetrical double-row suspension. This achieves the goals of expanding the operating space, enabling continuous overall roof maintenance, and reducing the safety risks of high-altitude operations. Its features include: The scaffolding includes double rows of suspended scaffolding uprights arranged symmetrically on both sides of the steel truss span, as well as steel pipes above the purlins connecting the uprights on the same side and horizontal bars connecting the uprights on both sides. The upper ends of the suspended scaffolding uprights are supported on the upper chord beam section of the steel truss via horizontal steel pipes above the truss. The steel pipes above the purlins are arranged in a cross shape with the roof purlins and are fixed to the roof purlins by fasteners on both sides. The fasteners on both sides fix the steel pipes around the roof purlins and lock them with fasteners, forming a secure connection between the steel pipes above the purlins and the roof purlins that is anti-slip and anti-detachment. A bottom full-covered wire mesh is formed between the double rows of suspended scaffolding uprights. The bottom full-covered wire mesh is surrounded by waist-protecting steel pipes wrapped with safety green netting, and a continuous life rope is stretched along the steel truss.

2. The large-span steel truss roof-mounted suspended work platform according to claim 1, characterized in that: The horizontal steel pipes above the steel truss are directly erected on the upper surface of the upper chord beam section of the truss. The steel pipes above the purlins and the roof purlins are all fixed with the fasteners on both sides at the cross intersection. This transfers the self-weight of the suspended work platform and the construction load to the existing steel structure of the roof through the suspension support of the upper chord beam section of the truss and the lateral fixing point of the roof purlin. This prevents the suspended frame from slipping longitudinally on the sloping roof and from detaching under strong wind loads.

3. The large-span steel truss roof-mounted suspended work platform according to claim 1, characterized in that: The connection between the uprights of the suspended scaffold and the steel pipes and horizontal bars above the purlins is provided with anti-slip double fasteners at the ends of the uprights. The anti-slip double fasteners at the ends of the uprights include two swivel fasteners arranged side by side at the connection node between the uprights and horizontal bars of the suspended scaffold, or an anti-detachment pin and a spare nut are added to the single fastener. Both the upper and lower ends of the suspended scaffold uprights are exposed for no less than 150mm, thereby preventing slippage caused by the loosening of the single fastener due to long-term stress and ensuring the safety of workers on the working surface.

4. The large-span steel truss roof-mounted suspended work platform according to claim 1, characterized in that: The bottom is fully covered with steel wire mesh and fixed in place. A kickboard is provided below or around the bottom of the steel wire mesh. The safety green netting wrapped around the waist guard steel pipe is vertically spaced along the height of the suspended scaffold uprights, with the spacing between adjacent waist guard steel pipes wrapped with safety green netting not exceeding 600mm. The lifeline is a continuous steel wire rope, fixed to the steel truss by rope clamps or special anchors. It is used to maintain the safety belts of the workers and ensure that the safety belts are hung high and used low, serving as a secondary safety for high-altitude operations.

5. A large-span steel truss roof-mounted suspended work platform according to claim 1, characterized in that: The length of the suspended scaffold uprights is 100cm greater than the height of the steel truss. The bottom is fully covered with wire mesh, which is 50cm lower than the lower chord. The longitudinal spacing of the double-row suspended scaffold uprights is 1.8m and the transverse spacing is 1.8m. A pedestrian passage of not less than 600mm is reserved between the two sides of the suspended scaffold uprights, so as to form sufficient maintenance and operation space under the lower chord and meet the needs of personnel passage and material transportation.

6. A method for overall maintenance of a large-span steel truss roof, employing a suspended work platform for a large-span steel truss roof as described in any one of claims 1-5, combining modular suspended erection along the span of the steel truss with segmented and continuous operation, thereby reducing the input of turnover materials, improving maintenance and construction efficiency, and ensuring the safety of personnel working at height, characterized in that... Includes the following steps: Step 1: Along the span of the steel truss, arrange double rows of suspended scaffolding uprights symmetrically on both sides of the steel truss. Lay the horizontal steel pipes above the steel truss on the upper chord beam section of the steel truss. Arrange the steel pipes above the purlins and the roof purlins in a cross shape and fix the steel pipes to the roof purlins with fasteners on both sides to form a suspended work platform frame. Step 2: Install anti-slip double fasteners at the connection between the uprights and horizontal bars of the suspended scaffolding, fully lay wire mesh at the bottom and install waist-protecting steel pipes wrapped with safety green netting, and stretch a continuous life rope along the steel truss to form a closed operating platform corridor with double safety redundancy. Step 3: Workers enter the operating platform corridor to perform overall grinding, rust removal, and anti-corrosion coating maintenance on the lower chord, tie rods, horizontal supports, and roof purlins of the steel truss; Step 4: After the maintenance of this work section is completed, the modular suspended work platform is dismantled and moved to the next work section. Steps 1 to 3 are repeated until the overall maintenance of the entire roof is completed.

7. The method for overall maintenance of a large-span steel truss roof according to claim 6, characterized in that: In step 1, the longitudinal spacing of the double-row suspended scaffold uprights is 1.8m, and the transverse spacing is 1.8m. A pedestrian passage of no less than 600mm is reserved between the two sides of the suspended scaffold uprights. The horizontal steel pipes above the steel truss are positioned according to the width of the main beam of the truss. The steel pipes on both sides are fixed by fasteners around the roof purlins and then locked with fasteners, so that the steel pipes above the purlins and the roof purlins form a tight connection that is anti-slip and anti-detachment, thereby transferring the load of the work platform to the existing steel structure of the roof.

8. The method for overall maintenance of a large-span steel truss roof according to claim 6, characterized in that: In step 2, the end of the upright is provided with anti-slip double fasteners, including two swivel fasteners arranged side by side at the connection node between the upright and the horizontal bar of the suspended scaffold, or an anti-detachment pin and a spare nut are added on the basis of a single fastener. The upper and lower ends of the suspended scaffold upright are exposed by no less than 150mm. The waist protection steel pipe is wrapped with safety green netting and is set at vertical intervals of no more than 600mm. The bottom is fully covered with wire mesh and has a kickboard with a height of no less than 200mm. The lifeline is a continuous steel wire rope, which is fixed to the steel truss by rope clamps or special anchors, and is used for workers to fasten their safety belts and ensure that the rope is used at a high position.

9. A method for overall maintenance of a large-span steel truss roof according to claim 6, characterized in that: In step 3, the suspended work platform between two adjacent steel trusses is connected by steel pipes and horizontal bars above the purlins to form a trestle, creating a continuous enclosed work platform corridor. Workers can perform maintenance work on the horizontal tie rods, support components and steel trusses inside the trestle. At the same time, a horizontal safety net is set up below the work platform to effectively reduce the fear of working at height and prevent falling objects.

10. A method for overall maintenance of a large-span steel truss roof according to claim 6, characterized in that: In step 4, the modular dismantling is carried out in the following order: first, dismantle the life rope and the safety green net covering the waist protection steel pipe; then, dismantle the bottom full-covered wire mesh and kickboard; and finally, dismantle the steel pipe above the purlin and the hanging scaffold uprights. The dismantled steel pipes, fasteners and wire mesh are hoisted to the next work section as a whole, with a reuse rate of more than 80%, thereby significantly reducing the amount of turnover materials and labor input, improving turnover efficiency and shortening the construction period.

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