A reverse-suspension membrane construction process for chemical corrosion protection of steel structures

Abstract

This application relates to a reverse-suspended membrane construction process for chemical corrosion protection of steel structures, comprising the following steps: S1: On-site measurement and construction calculation; S2: Design and cutting of the membrane sheet; S3: Installation of the locking plate and cable structure; S4: Membrane sheet hoisting: Guy ropes are laid at the bottom of the membrane sheet, and hoisting equipment holds both ends of the guy ropes to lift the membrane sheet. After hoisting, the two ends of the guy ropes are tied to the main steel structure; S5: Cable structure tensioning and limiting: A membrane sleeve is provided on the back side of the membrane sheet, and the free end of the cable structure passes through the membrane sleeve and is fixed to the lower chord of the truss of the next connection node; S6: Membrane sheet tensioning in the warp and weft directions: One end of the membrane sheet is fixed to the locking plate, and the membrane sheet is tensioned in the warp and weft directions using a tensioner; S7: Fixing the remaining boundary of the membrane sheet; S8: Repeating S3-S7 above, constructing sequentially according to the planned construction sequence; S9: Waterproofing construction and corrosion protection construction of exposed metal components. This application has the effect of preventing the inverted membrane from sinking under gravity when installing a large-span inverted membrane structure.

Description

Technical Field

[0001] This application relates to the technical field of inverted membrane construction, and in particular to an inverted membrane construction process for chemical corrosion protection of steel structures. Background Technology

[0002] To improve transportation efficiency when transporting products through ports and wharves, it is often necessary to construct prefabricated steel-structured chemical storage facilities near the ports and wharves for temporary storage of goods. However, when the goods to be transported are highly corrosive chemical products, such as ammonium sulfate, the substances volatilized from ammonium sulfate are not only highly corrosive to the steel structure but also pollute the atmosphere. Therefore, the issue of internal corrosion protection of the steel structure needs to be considered.

[0003] To avoid or mitigate the corrosion of the steel structure by chemical products inside the shed, a reverse-hanging membrane anti-corrosion process has emerged. This involves creatively installing the membrane material, which is traditionally installed on the outside of the steel structure, inside the steel structure to protect its interior.

[0004] However, currently, inverted membrane structures are typically used in areas with small areas and spans, such as sewage treatment plants. Warehouses used for storing goods, on the other hand, usually have larger spans and greater heights. If conventional inverted membrane construction techniques are continued, there is a high probability of membrane sagging due to insufficient tension. Therefore, the inventors believe that how to achieve large-span installation of inverted membrane structures is a problem that urgently needs to be solved. Summary of the Invention

[0005] To achieve large-span installation of inverted membrane structures, this application provides an inverted membrane construction process for chemical corrosion protection of steel structures.

[0006] The reverse-hanging membrane construction process for chemical corrosion protection of steel structures provided in this application adopts the following technical solution:

[0007] A reverse-suspension membrane construction process for chemical corrosion protection of steel structures includes the following steps:

[0008] S1: On-site measurement and construction calculation: Measure the main steel structure, design the connection nodes of the membrane on the main steel structure based on the measured values, and plan the construction sequence;

[0009] S2: Design and cut the diaphragm: Measure the geometry of the support structure and the connection nodes, design the shape of the diaphragm at each position, and cut the diaphragm according to the design shape;

[0010] S3: Install the locking plate and cable structure: According to the construction sequence, first install one end of the cable structure on the lower chord of the tube truss at the connection node, and then install the locking plate, which is used to fix the position of the diaphragm at the connection node, on the lower chord of the tube truss.

[0011] S4: Membrane hoisting: After the membrane arrives on site, guy ropes are laid at the bottom of the membrane. The hoisting equipment pulls the two ends of the guy ropes to lift the membrane. After hoisting, the two ends of the guy ropes are tied to the main steel structure.

[0012] S5: Tensioning limit of cable structure: A membrane sleeve is provided on the back side of the diaphragm, and the free end of the cable structure passes through the membrane sleeve and is fixed to the lower chord of the truss of the next connection node;

[0013] S6: Diaphragm tensioning in the warp and weft directions: Fix one end of the diaphragm to the locking plate and tension the diaphragm in the warp and weft directions using a tensioner;

[0014] S7: Fixing the remaining boundaries of the diaphragm: Fix the remaining three sides of the stretched diaphragm to the locking plate;

[0015] S8: Repeat S3-S7 above, and carry out the construction in sequence according to the planned construction order;

[0016] S9: Waterproofing construction and corrosion protection construction of exposed metal components.

[0017] By adopting the above technical solution, by setting guy ropes at the bottom of each diaphragm, when the hoisting equipment pulls each guy rope to lift the diaphragm, several guy ropes below the diaphragm will lift the diaphragm. After the diaphragm is hoisted into place, the guy ropes are tensioned and tied. After the diaphragm is lifted, the free end of the cable structure is passed through the membrane sleeve on the back side of the diaphragm and fixed to the lower chord of the truss of the next connection node. Through the tensioning effect of the cable structure on the inner side of the diaphragm and the slinging effect of the guy ropes on the outer side of the diaphragm, the internal and external forces work simultaneously to minimize the probability of the membrane material sinking due to the large span. The tensioner tensions the diaphragm in the warp and weft directions, improving the tensioning effect of the diaphragm. The multiple effects of the cable structure, guy ropes, and tensioner improve the installation effect of the reverse-lifted membrane.

[0018] Preferably, in S1, 3D3S Design software is used to perform three-dimensional modeling, simulate and analyze the entire construction process of the steel structure, calculate the stress and deformation of the main load-bearing components at each construction stage, plan the diaphragms of uniform size within the stress and deformation tolerance range of the main load-bearing components, and design the connection nodes of each diaphragm.

[0019] By adopting the above technical solution and using 3D modeling technology to simulate construction, the stress and deformation of the main load-bearing components at each construction stage can be calculated. This makes it easier to predict the situations that may be encountered during the construction process. Furthermore, the size and connection position of the membrane can be designed based on the stress and deformation of the main load-bearing components, so as to match the most suitable membrane size to each position of the steel structure, thereby improving construction efficiency.

[0020] Preferably, in S1, the construction sequence is to first construct the main connecting corridor and then construct the gable walls at both ends. The connecting corridor is divided into several segments along its axial direction. The construction sequence of the connecting corridor is designed to proceed from the middle to both ends in two groups. The construction sequence within each segment is designed to proceed symmetrically from the arch to both sides. The construction sequence of the gable walls is designed to proceed from the middle, from top to bottom, and then to both sides.

[0021] By adopting the above technical solutions, construction workers can carry out construction in an orderly manner according to the construction sequence, which can maximize construction efficiency.

[0022] Preferably, each segment has an exhaust port at the highest point of the arch for lighting and pressure relief, and the diaphragm is constructed symmetrically from both sides of the exhaust port toward the bottom.

[0023] By adopting the above technical solution, when constructing each segment symmetrically, a long exhaust vent is reserved on the arch of the main steel structure to meet the ventilation and lighting requirements, as well as the pressure relief requirements during typhoons, ensuring the stability of the main steel structure. An outer anti-corrosion structure is also installed on the outside of the main steel structure to mitigate sodium ion corrosion in the sea breeze. The outer anti-corrosion structure covers the exhaust vent but does not affect the lighting. Under the premise of ensuring the lighting requirements, rainwater can be prevented from entering the shed during rainfall.

[0024] Preferably, in S3, the locking diaphragm plate is inverted T-shaped, the bottom plate of the locking diaphragm plate has bolt holes of uniform specifications, and the four edges of the diaphragm are fixed to the bottom plate of the locking diaphragm plate using diaphragm strips.

[0025] By adopting the above technical solution, bolt holes of the same specifications are opened on the bottom plates of the diaphragm strip and the locking plate. When fixing the boundary of the diaphragm, the diaphragm strip presses the diaphragm tightly onto the bottom plate of the locking plate. Bolts are used to fix the diaphragm strip and the locking plate. An inverted T-shaped locking plate is set so that a certain distance is left between the diaphragm and the main steel structure, and it is easier for workers to tighten the nuts on the side away from the diaphragm strip.

[0026] Preferably, in S4, multiple wind ropes are spaced apart along the length of the diaphragm. A truck crane and a winch are used to lift the diaphragm. After lifting, the two ends of the wind ropes are tied to the main steel structure 3-4m away from the connection node.

[0027] By adopting the above technical solution, the truck crane lifts the guy ropes at both ends of the membrane, and the winch is connected to the guy rope in the middle to lift the membrane together. After the membrane is lifted into place, the guy ropes are first tied to the main steel structure. At this time, due to the slinging effect of multiple guy ropes, the membrane will not sag under the action of gravity. Then, workers can ride an aerial work platform to the top to fix one end of the membrane and tension the membrane. The construction is also more convenient for workers. At least one worker can complete the installation and tensioning of the entire membrane, which greatly improves the construction efficiency and reduces the probability of the membrane sinking due to the large span.

[0028] Preferably, in S5, the membrane sleeve is provided with a plurality of portions spaced apart along the warp direction of the membrane sheet;

[0029] The cable structure includes tie assemblies at both ends for connecting to the lower chord of the tubular truss and steel cables connecting the two tie assemblies. The tie assemblies at the free ends pass through multiple membrane sleeves in sequence and heat-seal the steel cables to the membrane sleeves.

[0030] By adopting the above technical solution, the several membrane sleeves arranged at intervals along the meridian direction of the diaphragm facilitate uniform tensioning at various positions of the diaphragm, heat-sealing the steel cables to the membrane sleeves, and preventing displacement of the membrane sleeves along the axial direction of the steel cables. After the diaphragm is fixed, the cable structure is located between the diaphragm and the main steel structure, eliminating the need to dismantle the cable structure. On the one hand, under ideal conditions, the cable structure can maintain a continuous and constant tension on the diaphragm, further reducing the probability of the diaphragm sinking under gravity and improving the installation effect of the diaphragm. On the other hand, the cable structure can increase the rigidity of the main steel structure and improve its wind resistance.

[0031] Preferably, in S6, each of the four boundaries of the diaphragm is fixed with a clamp, which is hooked to the main steel structure via a wire rope and a hook. When tensioned in the warp and weft directions, the tensioner gradually tightens the wire rope connected to the clamp and the hook.

[0032] By adopting the above technical solution, workers can adjust the tensioner to gradually tighten the wire rope, making it easier to adjust the tension of the three boundaries of the diaphragm.

[0033] Preferably, in S8, when the diaphragms are installed sequentially, the boundary of the subsequently installed diaphragm is pressed together with the boundary of the preceding adjacent diaphragm, and the joint formed by pressing two adjacent diaphragms together is connected by heat sealing.

[0034] By adopting the above technical solution, the method of pressing the adjacent membrane sheet together with the subsequent installation of the membrane sheet makes the entire inverted membrane form a completely sealed structure, so as to completely isolate the main steel structure from the outside world and enhance the anti-corrosion effect of the inverted membrane.

[0035] Preferably, in S9, during waterproofing construction, the waterproof membrane is hot-melted and applied to the side of the membrane away from the main steel structure in a top-to-bottom sequence;

[0036] During the anti-corrosion construction of exposed metal components, a waterproof membrane is hot-melt welded onto adjacent membrane sheets to isolate the exposed metal components from the outside air.

[0037] By adopting the above technical solution, a waterproof membrane is constructed on the side of the inverted membrane that is away from the main steel structure. The waterproof membrane also wraps the exposed metal components, isolating the exposed metal components from the outside air, thus achieving both waterproofing of the inverted membrane and corrosion protection of the exposed metal components.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. This application provides a constant tension to the diaphragm by setting a cable structure between the diaphragm and the main steel structure. This not only reduces the probability of the diaphragm sinking under deflection, but also enhances the strength and wind resistance of the main steel structure. Furthermore, by tying wind ropes to the bottom of the diaphragm at the bottom of the inverted diaphragm, the probability of the diaphragm sinking can be further reduced.

[0040] 2. Adjacent diaphragms are connected by pressing, which enhances the overall sealing effect of the inverted membrane and thus improves its corrosion resistance.

[0041] 3. By hot-melt welding the waterproof membrane onto adjacent membrane sheets, the waterproof membrane wraps around the exposed metal components, isolating them from the outside air and slowing down their corrosion. Attached Figure Description

[0042] Figure 1 This is the construction flowchart of this application.

[0043] Figure 2 This is a top view of the connecting corridor section of the main steel structure.

[0044] Figure 3 This is a top view created to show the position of the lower chord of the tubular truss on the main steel structure and the position of the locking plate on the lower chord of the tubular truss.

[0045] Figure 4 This is a structural diagram designed to illustrate the connection between the diaphragm and the locking plate.

[0046] Figure 5 This is a schematic diagram to illustrate the state of the diaphragm when the cable structure is connected.

[0047] Figure 6 This is a schematic diagram of the hoisting process when a truck crane and winch are used to pull the guy ropes to lift the diaphragm.

[0048] Figure 7 This is a schematic diagram of the state of the cable structure when it is pulled by the lower chords of the two tubular trusses.

[0049] Figure 8 This is a structural diagram of the gable wall.

[0050] Explanation of reference numerals in the attached drawings: 1. Main steel structure; 11. Lower chord of the tubular truss; 12. Connecting corridor; 13. Gable wall; 2. Membrane sheet; 21. Membrane sleeve; 3. Locking plate; 4. Cable structure; 41. Tie assembly; 411. Connecting plate; 412. Ear plate; 413. Anchor head; 42. Steel cable; 5. Guy rope; 6. Vent; 7. Waterproof membrane; 8. Metal connector; 9. Truck crane; 10. Winch. Detailed Implementation

[0051] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0052] This application discloses a reverse-suspension membrane construction process for chemical corrosion protection of steel structures. (Refer to...) Figures 1-8 The construction process for inverted membrane structures used for chemical corrosion protection of steel structures includes the following steps:

[0053] S1: On-site measurement and construction calculation: Measure the main steel structure 1, design the connection nodes of the membrane 2 on the main steel structure 1 based on the measured values, and plan the construction sequence.

[0054] S11: At the construction site, a total station is used to measure the length, span, and crown height of the main steel structure 1.

[0055] S12: Use 3D3S Design software to create a 3D model of the main steel structure 1 to scale.

[0056] S13: Simulate and analyze the entire construction process of the main steel structure 1, and calculate the stress and deformation of the main load-bearing components at each construction stage;

[0057] S14: Within the stress and deformation tolerance range of the main load-bearing components, plan uniformly sized diaphragms 2 and design the connection nodes of each diaphragm 2.

[0058] S15: Based on the 3D model of the main steel structure 1, the construction sequence is designed as follows: first construct the connecting corridor 12 of the main structure, then construct the gable walls 13 at both ends. The connecting corridor 12 is divided into several segments along its axis. The construction sequence of the connecting corridor 12 is designed to proceed from the middle to both ends in two groups. Within each segment, the construction sequence is designed to proceed symmetrically from the arch to both sides. The construction sequence of the gable walls 13 is designed to proceed from the middle, from top to bottom, and then to both sides. During the installation of the gable walls 13, temporary ladders can be fabricated and installed. Lifelines are tied to the truss, and the connection nodes of the membrane 2 are installed.

[0059] S2: Design and cut diaphragm 2: Measure the geometry of the support structure and the connection nodes, design the shape of diaphragm 2 at each position, and cut diaphragm 2 according to the design shape.

[0060] The diaphragm 2 of this application uses ETPE membrane material, which has excellent fatigue resistance, good resilience, wear resistance, tensile strength, oil / chemical resistance, high impact resistance, and good mechanical properties.

[0061] Based on 3D modeling and simulation, this application uses four membrane panels 2 in each segment as an example for illustration. The four membrane panels 2 are symmetrically distributed with the highest point of the arch as the axis. Each membrane panel 2 on the main steel structure 1 is marked with a number, and membrane panels 2 at the same position on each segment are marked with the same number to facilitate the subsequent hoisting of the membrane panels 2.

[0062] S3: Install the locking plate 3 and the cable structure 4: Install one end of the cable structure 4 used for tensioning the diaphragm 2 on the lower chord 11 of the tubular truss at the connecting node, and install the locking plate 3 used to fix the position of the diaphragm 2 at the connecting node on the lower chord 11 of the tubular truss.

[0063] The cable structure 4 includes tie assemblies 41 at both ends and a steel cable 42 connecting the two tie assemblies 41. During fixing, the tie assembly 41 at one end of the cable structure 4 is fixed to the lower chord 11 of the tubular truss at the connecting node. Each tie assembly 41 includes a connecting plate 411 for fitting and fixing to the lower chord 11 of the tubular truss, an ear plate 412 hinged to the distal end of the connecting plate 411, and an anchor head 413 hinged to the end of the ear plate 412 away from the connecting plate 411. The steel cable 42 is fixedly connected between the two anchor heads 413.

[0064] The locking plate 3 is an inverted T-shape and is welded and fixed to the lower chord 11 of the tubular truss, with the locking plate 3 extending continuously along the length of the lower chord member. Different specifications are matched to the different sizes of the lower chord 11 of the tubular truss at various locations. The base plate of the locking plate 3 has bolt holes of uniform specifications for easy installation.

[0065] S4: Hoisting of diaphragm 2: After diaphragm 2 arrives on site, guy ropes 5 are laid at the bottom of diaphragm 2. The hoisting equipment pulls the two ends of the guy ropes to lift the diaphragm 2. After lifting, the two ends of the guy ropes are tied to the main steel structure 1.

[0066] S41: Lay multiple (three for example) guy ropes 5 at intervals on the bottom surface directly below the hoisting position. Preferably, the intervals of the three guy ropes are the same.

[0067] S42: The diaphragm 2 is fully unfolded and laid on the wind rope 5, so that the length direction of the wind rope 5 is perpendicular to the length direction of the diaphragm 2.

[0068] S43: Use two truck cranes 9 and two winches 10 to lift the diaphragm 2. The two truck cranes 9 hook the guy ropes 5 at both ends respectively, and the two winches 10 hook the two ends of the guy rope 5 in the middle respectively. The truck cranes 9 and winches 10 slowly and vertically lift the guy rope 5 and the diaphragm 2.

[0069] S43: After hoisting into place, workers use an aerial work platform to tie and secure the two ends of the three guy ropes 5 to the main steel structure 1, which is 3-4m away from the connection node.

[0070] S5: Tensioning limit of cable structure 4: A membrane sleeve 21 is provided on the back side of the diaphragm 2, and the free end of the cable structure 4 passes through the membrane sleeve 21 and is fixed to the lower chord 11 of the tube truss of the next connection node.

[0071] Each diaphragm 2 is fixed to one side with a diaphragm sleeve 21. The diaphragm sleeve 21 is glued on both sides and open at both ends, and multiple diaphragm sleeves 21 are spaced apart along the longitudinal direction (i.e., the length direction) of the diaphragm 2. The tie assembly 41 at the free end passes through multiple diaphragm sleeves 21 in sequence and heat-seales the steel cable 42 to the diaphragm sleeve 21. Tensioning the tie assembly 41 at the free end causes the diaphragm 2 to tighten, and then the tie assembly 41 at the free end is fixed to the lower chord 11 of the truss of the next connection node. The diaphragm 2 can also be lifted with the remaining three boundaries of the diaphragm 2 not locked. Due to the tie of the cable structure 4, the probability of the diaphragm 2 sinking under gravity is greatly reduced.

[0072] S6: Membrane 2 warp and weft tensioning: Fix one end of the membrane 2 to the locking plate 3, and use a tensioner to tension the membrane 2 in the warp and weft directions.

[0073] The four edges of diaphragm 2 are fixed to the locking diaphragm plate 3 using diaphragm 2 pressure strips. Bolt holes are also provided on the diaphragm 2 pressure strips, and the bolt holes on the diaphragm 2 pressure strips are of the same specifications and spacing as those on the locking diaphragm. During fixing, the diaphragm 2 pressure strips are pressed onto the side of diaphragm 2 facing away from the locking diaphragm plate 3 at its highest point. An electric screwdriver is then used to drive matching bolts into the bolt holes on both the diaphragm 2 pressure strips and the locking diaphragm plate 3. The "highest point" refers to the end of diaphragm 2 that is at a higher height from the ground.

[0074] Specifically, several clamps are fixed at intervals along the latitudinal direction of the diaphragm 2. The tensioner tightens the steel wire rope connected to the clamps and hooks the hook at the far end of the steel wire rope onto the main steel structure 1. The clamps on both sides of the diaphragm 2 are symmetrically arranged.

[0075] S7: Fixing the remaining edges of diaphragm 2: Fix the remaining three sides of the stretched diaphragm 2 to the locking plate 3. Use the diaphragm 2 pressure plate to press the remaining three edges of diaphragm 2 onto the locking plate 3, and fix them with bolts.

[0076] S8: Repeat S3-S7 above, and carry out construction in sequence according to the planned construction order.

[0077] S9: Waterproofing construction and corrosion protection construction of exposed metal components.

[0078] During waterproofing construction, the waterproof membrane 7 is hot-melted and applied to the side of the membrane 2 away from the main steel structure 1 in a top-to-bottom order.

[0079] Corrosion protection of exposed metal components includes corrosion protection of metal connectors 8 (e.g., pressure strips of diaphragm 2) used to fix diaphragm 2 and corrosion protection of metal accessories (e.g., clamps, exposed screw parts of rods) fixed to diaphragm 2.

[0080] The anti-corrosion construction of the metal connector 8 is as follows: the waterproof membrane 7 is hot-melt welded to the adjacent membrane 2 to isolate the exposed metal components from the outside air.

[0081] The anti-corrosion construction of metal accessories is as follows: aluminum alloy clamps are treated with electrochemical anodizing for anti-corrosion; steel clamp seats are treated with hot-dip galvanizing for anti-corrosion; exposed screw parts of the rods are coated with anti-rust oil and the surface is sprayed with epoxy zinc-rich primer with a thickness of 70~100um; the cable structure 4 is sealed with double-layer HDPE material to achieve a high-efficiency anti-corrosion effect, and secondary protection is achieved by hot-melt welding of both sides of the membrane sleeve 21 to the membrane sheet 2.

[0082] S10: Membrane structure inspection: The entire inverted membrane structure is divided into 16-20 monitoring points, which are symmetrically set at the arch of the inverted membrane. A total station is used to monitor the changes in the elevation and coordinate position of the 16-20 monitoring points in real time, and to monitor the structural deformation of the main steel structure 1 and the overall deflection of the inverted membrane.

[0083] According to the monitoring, the inverted membrane structure did not show any downward deflection, and the structural deformation of the main steel structure 1 was within 10mm relative to the initial state of the completed truss structure, indicating high installation accuracy.

[0084] The implementation principle of the reverse-suspended membrane construction process for chemical corrosion protection of steel structures in this application embodiment is as follows: By setting guy ropes 5 at the bottom of each membrane 2, when the hoisting equipment pulls each guy rope 5 to lift, the several guy ropes 5 below the membrane 2 will lift the membrane 2. After the membrane 2 is hoisted into place, the guy ropes 5 are tensioned and tied. After the membrane 2 is lifted, the free end of the cable structure 4 passes through the membrane sleeve 21 on the back side of the membrane 2 and is fixed to the lower chord 11 of the pipe truss of the next connection node. Through the tensioning effect of the cable structure 4 on the inner side of the membrane 2 and the slinging effect of the guy ropes 5 on the outer side of the membrane 2, the inner and outer sides work simultaneously to minimize the probability of membrane material sinking due to large span. The tensioner tensions the membrane 2 in the warp and weft directions, which improves the tensioning effect of the membrane 2. The multiple effects of the cable structure 4, guy ropes 5 and tensioner improve the installation effect of the reverse-suspended membrane.

[0085] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A reverse-suspended membrane construction process for chemical corrosion protection of steel structures, characterized in that: Includes the following steps: S1: On-site measurement and construction calculation: Measure the main steel structure (1), design the connection nodes of the membrane (2) on the main steel structure (1) according to the measured values, and plan the construction sequence; S2: Design and cut the diaphragm (2): Measure the geometry of the support structure and the connection nodes, design the shape of the diaphragm (2) at each position, and cut the diaphragm (2) according to the design shape; S3: Install the locking plate (3) and cable structure (4): According to the construction sequence, first install one end of the cable structure (4) on the lower chord (11) of the tube truss at the connection node, and install the locking plate (3) used to fix the diaphragm (2) at the position of the connection node on the lower chord (11) of the tube truss. S4: Diaphragm (2) hoisting: After the diaphragm (2) arrives at the site, a wind rope (5) is laid at the bottom of the diaphragm (2). The hoisting equipment pulls the two ends of the wind rope (5) to lift the diaphragm (2). After hoisting, the two ends of the wind rope (5) are tied to the main steel structure (1). S5: Tensioning limit of cable structure (4): A membrane sleeve (21) is provided on the back side of the diaphragm (2), and the free end of the cable structure (4) passes through the membrane sleeve (21) and is fixed to the lower chord (11) of the tube truss of the next connecting node; S6: Membrane (2) warp and weft tensioning: Fix one end of the membrane (2) to the locking plate (3) and use a tensioner to tension the membrane (2) warp and weft. S7: Fixing the remaining boundaries of the diaphragm (2): Fix the remaining three sides of the tensioned diaphragm (2) to the locking plate (3); S8: Repeat S3-S7 above, and carry out the construction in sequence according to the planned construction order; S9: Waterproofing construction and corrosion protection construction of exposed metal components.

2. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 1, characterized in that: In S1, 3D3S Design software is used to perform three-dimensional modeling, simulate and analyze the entire construction process of the main steel structure (1), calculate the stress and deformation of the main load-bearing components in each construction stage, plan the diaphragm (2) of uniform size within the stress and deformation tolerance range of the main load-bearing components, and design the connection nodes of each diaphragm (2).

3. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 1, characterized in that: The construction sequence described in S1 is to first construct the main connecting corridor (12) and then construct the gable walls (13) at both ends. The connecting corridor (12) is divided into several segments along its axial direction. The construction sequence of the connecting corridor (12) is designed to proceed from the middle to both ends in two groups. The construction sequence within each segment is designed to proceed symmetrically from the arch to both sides. The construction sequence of the gable walls (13) is designed to proceed from the middle, from top to bottom, and then to both sides.

4. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 3, characterized in that: Each segment has a reserved exhaust port (6) at the highest point of the arch for lighting and pressure relief. The diaphragm (2) is constructed symmetrically from both sides of the exhaust port (6) towards the bottom.

5. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 1, characterized in that: In S3, the locking diaphragm plate (3) is inverted T-shaped, and the bottom plate of the locking diaphragm plate (3) has bolt holes of uniform specifications. The four boundaries of the diaphragm (2) are fixed to the bottom plate of the locking diaphragm plate (3) using diaphragm (2) pressure strips.

6. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 1, characterized in that: In S4, multiple wind ropes (5) are spaced apart along the length of the diaphragm (2). A truck crane (9) and a winch (10) are used to lift the diaphragm (2). After lifting, the two ends of the wind ropes (5) are tied to the main steel structure (1) at a distance of 3-4m from the connection node.

7. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 1, characterized in that: In S5, the membrane sleeve (21) is provided with a plurality of portions spaced apart along the warp direction of the membrane (2); The cable structure (4) includes tie assemblies (41) at both ends for connecting to the lower chord (11) of the tubular truss and steel cables (42) connecting the two tie assemblies (41). The tie assemblies (41) at the free end pass through a plurality of membrane sleeves (21) in sequence, and the steel cables (42) are thermally connected to the membrane sleeves (21).

8. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 1, characterized in that: In S6, each of the four boundaries of the diaphragm (2) is fixed with a clamp. The clamp is hooked to the main steel structure (1) by a wire rope and a hook. When tensioned in the warp and weft directions, the tensioner gradually tightens the wire rope connected to the clamp and the hook.

9. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 1, characterized in that: In S8, when the diaphragm (2) is installed in sequence, the boundary of the diaphragm (2) installed later is pressed together with the boundary of the adjacent diaphragm (2) before it, and the joint formed by pressing two adjacent diaphragms (2) is connected by heat sealing.

10. The reverse-hanging membrane construction process for chemical corrosion protection of steel structures according to claim 1, characterized in that: In S9, during waterproofing construction, the waterproof membrane (7) is hot-melted and applied to the side of the membrane (2) away from the main steel structure (1) in a top-to-bottom order; During the anti-corrosion construction of exposed metal components, a waterproof membrane (7) is hot-melt welded onto the adjacent membrane (2) to isolate the exposed metal components from the outside air.

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