Anti-cracking structure treatment method for steel structure insulation board wall

Abstract

The invention relates to the technical field of building wallboard construction, and provides a steel structure heat preservation board wall anti-cracking structure treatment method which comprises the following steps that firstly, U-shaped metal clamping pieces are welded to the two sides of a steel structure stand column, sawtooth-shaped protrusions are arranged on the inner sides of the U-shaped metal clamping pieces, and the inner walls of the U-shaped metal clamping pieces are coated with neutral silicone structural adhesive; secondly, the polyurethane heat preservation plate is embedded into the U-shaped metal clamping piece, and a flexible transition layer is formed through pressure applying, pressure maintaining and curing of a hydraulic press; and thirdly, grooves are cut in the joints of the adjacent heat preservation plates. The problems that joint treatment depends on a single material, and bonding strength and deformation coordination cannot be considered at the same time are solved; and even rigid-flexible composite reinforcing measures for long plates are lacked, in addition, a multi-layer anti-cracking system is not constructed, and local stress concentration still leads to microcrack propagation.

Description

Technical Field

[0001] The present invention relates to the technical field of building wallboard construction, and specifically to a method for treating the anti-cracking structure of a steel structure insulation board wall. Background Art

[0002] With the rapid development of prefabricated buildings, steel structure insulation board walls are widely used due to their advantages such as light weight, high strength, and convenient construction. However, the co-deformation ability of steel structures and insulation boards is poor, and joint cracking is prone to occur under the action of wind loads, temperature changes, and foundation settlement, resulting in a decline in insulation performance and the peeling off of the finishing layer, severely restricting their engineering applications.

[0003] In the prior art, the invention patent with the publication number CN103089012B discloses a method of dispersing stress using U-shaped fasteners and polymer mortar, but the problem of flexural cracking in the middle of long plates is not solved; the invention patent with the publication number CN104775541B proposes a combination of fiberglass mesh cloth and caulking tape for anti-cracking, but does not consider the elastic deformation characteristics of steel structures; the invention patent with the publication number CN101793097B uses slag-silver powder caulking agent, but has insufficient flexibility and is difficult to adapt to the dynamic deformation of steel structures.

[0004] In addition, traditional methods rely on a single material for joint treatment, unable to balance bond strength and deformation coordination; even lack rigid-flexible composite strengthening measures for long plates, and do not construct a multi-level anti-cracking system, and local stress concentration will still lead to the expansion of microcracks. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for treating the anti-cracking structure of a steel structure insulation board wall, which solves the problems of relying on a single material for joint treatment, being unable to balance bond strength and deformation coordination; even lacking rigid and flexible composite strengthening measures for long plates, and not constructing a multi-level anti-cracking system, and local stress concentration will still lead to the expansion of microcracks.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A method for treating the anti-cracking structure of a steel structure insulation board wall includes the following steps: Step 1: Weld U-shaped metal fasteners on both sides of the steel structure columns. The inner side of the U-shaped metal fasteners is provided with serrated protrusions, and the inner wall is coated with a neutral silicone structural adhesive with an elastic modulus of 0.8 - 0.9 MPa, and the thickness of the adhesive layer is 2.5 - 3 mm; Step 2: Insert the polyurethane insulation board into the U-shaped metal fasteners, apply a pressure of 6 - 6.5 MPa with a hydraulic press and keep the pressure for 35 - 40 min, and cure for 30 - 45 hours to form a flexible transition layer; Step 3: Cut a groove at the joint of adjacent insulation boards. The groove is a V-shaped groove or an inverted trapezoidal groove, and the groove is filled with polymer mortar. Step 4: Cover the surface of the non-set mortar with an alkali-resistant fiberglass mesh cloth, and press it into a depth of 2 / 3 of the mortar layer thickness. Step 5: Install the upper insulation board using a wedge jack, and control the perpendicularity deviation within 0.8 mm / m with a laser locator. Step 6: Spray an elastic waterproof coating on the joint surface, and form a continuous film layer after drying. The dry film thickness is 0.8 mm. Step 7: Set an ethylene propylene diene monomer (EPDM) rubber elastic gasket on the contact surface between the insulation board and the steel beam. Step 8: Add an H-shaped steel stiffener in the middle of the back of the insulation board and connect it through an embedded buckle. Step 9: Fully hang a galvanized steel wire mesh on the surface of the insulation board, and lay a 3-mm-thick rubber isolation cushion between the steel wire mesh and the insulation board. Step 10: Detect cracks after 7 days of curing, and inject epoxy resin micro-slurry to repair cracks with a width > 0.1 mm.

[0007] Further, the U-shaped metal fastener described in Step 1 is made of 304 stainless steel, and the serrated protrusions include single-direction serrated lines or two-way staggered serrated lines.

[0008] Further, the elongation at break of the neutral silicone structural adhesive described in Step 1 is 450%, and the serrated protrusions form continuous wavy lines on the surface of the adhesive layer.

[0009] Further, in Step 3, when the groove is a V-shaped groove, the depth of the V-shaped groove is 35 mm and the width is 12 mm. When the groove is an inverted trapezoidal groove, the depth of the inverted trapezoidal groove is 1 / 3 of the board thickness, the upper opening width of the inverted trapezoidal groove is 15 mm, and the lower opening width is 10 mm.

[0010] Further, the mixing ratio of the polymer mortar described in Step 3 is: 100 kg of cement, 150 kg of fine sand, 8 kg of EVA powder, 0.8 kg of nano-silica, and 45 kg of water.

[0011] Further, the spacing of the embedded buckles described in Step 8 is 380 mm, and the tensile strength is 12 MPa.

[0012] Further, the dynamic stiffness of the isolation cushion described in Step 9 is 8 MPa, the gram weight of the galvanized steel wire mesh is 160 g / m², and the surface of the mesh cloth is coated with KH-550 coupling agent.

[0013] Further, the elastic gasket described in Step 7 is in an "I" shape, and stress relief holes with a diameter of 20 mm are opened longitudinally every 600 mm, and the holes are filled with silicone sealant; when the length of the insulation board ≥ 4 m, a prestressed carbon fiber belt is added to the back.

[0014] Further, the elastic waterproof coating described in Step 6 is a polyurethane-acrylate or water-based fluorocarbon coating.

[0015] Further, the epoxy resin micro-slurry ratio described in Step 10 is 100 kg of epoxy resin, 30 kg of curing agent, 15 kg of nano-calcium carbonate, and the slurry fluidity is 220 mm.

[0016] The present invention provides a method for treating the anti-cracking structure of a steel structure insulation board wall, which has the following beneficial effects: In the present invention, serrated protrusions are provided inside the U-shaped metal fasteners, so that the serrated protrusions and the polymer mortar act synergistically to improve the interfacial shear strength. Combined with the combined use of elastic gaskets and seismic isolation cushions, the steel structure insulation board wall system remains crack-free under a displacement of ±5 mm. The three-level protection system of the present invention from interfacial bonding, intermediate transition to surface layer protection reduces the cracking probability within a 50-year period to less than 3%, which is 80% lower than the prior art. In addition, the local strengthening method of H-shaped ribs is used to replace the overall thickening method, reducing the material consumption by 25%. Description of the Drawings

[0017] Figure 1 It is a flowchart of the method of the present invention. Detailed Embodiments

[0018] The following will combine the present invention Figure 1 to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1. This embodiment discloses a method for treating the anti-cracking structure of a steel structure insulation board wall, including the following steps: Step 1: The material of the steel structure column (H-shaped steel column) is Q355B, the cross-sectional area of the steel structure column is H300 mm × 150 mm × 6 mm × 5 mm, and U-shaped metal fasteners are welded on both sides of the steel structure column. The U-shaped metal fasteners are made of 304 stainless steel with a wall thickness of 3 mm. Serrated protrusions are processed on the inner side of the U-shaped metal fasteners. In this embodiment, the serrated protrusions are one-way serrated patterns, the height of the serrated protrusions is 1.5 mm, and the spacing is 12 mm; and neutral silicone structural adhesive is coated on the inner wall of the U-shaped metal fasteners. The elastic modulus of the neutral silicone structural adhesive is 0.8 MPa, the elongation at break is 450%, and the thickness of the adhesive layer is 2.5 mm. The provided serrated protrusions increase the adhesive contact area. The serrated protrusions form continuous wavy patterns on the surface of the adhesive layer. The high elasticity of the neutral silicone structural adhesive can absorb the dynamic deformation stress between the steel structure and the insulation board, avoiding interfacial debonding.

[0020] Step 2: The insulation board is a polyurethane insulation board with a thickness of 100 mm. It is embedded in a U-shaped metal fixture, and a pressure of 6 MPa is applied through a hydraulic press for 35 minutes of pressure holding. This ensures that the neutral silicone structural adhesive evenly fills the gap and cures for 30 hours. The pressure guarantees no hollowing in the adhesive layer. During the curing stage, temperature and humidity are controlled, with the curing conditions being 25°C and RH60%. After curing, a flexible transition layer is formed. Through testing, the shear strength is increased to 2.6 MPa, while the traditional method is 1.2 MPa.

[0021] Step 3: Cut a groove at the joint of adjacent insulation boards. The groove is a V-shaped groove, which increases the caulking contact surface. The depth of the groove is 35 mm and the width is 12 mm. Polymer mortar is filled in the groove, and the specific ratio is: 100 kg of cement, 150 kg of fine sand, 8 kg of EVA powder, 0.8 kg of nano-silica, and 45 kg of water. The added nano-silica can effectively improve the crack resistance toughness of the mortar. After testing, the flexural strength reaches 8.5 MPa, which is 40% higher than that of ordinary mortar in the prior art.

[0022] Step 4: Cover the alkali-resistant fiberglass mesh cloth when the mortar has not yet initially set. The gram weight is 160 g / m², and KH-550 coupling agent is coated. The width of the mesh cloth is 120 mm, with a lap joint of 60 mm, and the pressing-in depth is 2 / 3 of the thickness of the mortar layer. The mesh cloth forms a two-way tensile layer, and the added coupling agent enhances the adhesion to the mortar. Through actual testing, the peel strength ≥ 1.5 kN / m.

[0023] Step 5: Install the upper insulation board using a 5° wedge-shaped jacking device with a jacking force of 2.8 kN. The laser locator calibrates the verticality deviation to be 0.8 mm / m, ensuring that the mortar overflows at the joint and is scraped flat. The wedge-shaped jacking method eliminates the installation gap, and the laser positioning guarantees the straightness of the joint, reducing stress concentration.

[0024] Step 6: Spray a polyurethane-acrylate elastic waterproof coating (solid content 65%, elongation rate 350%) on the joint surface. After drying, a continuous film layer is formed with a dry film thickness of 0.8 mm. The coating can adapt to a displacement deformation of ±5 mm, and the waterproof moisture permeability is 0.1 g / (m²·h), blocking the intrusion of moisture and preventing frost heaving and cracking.

[0025] Step 7: Set an elastic gasket made of ethylene propylene diene monomer rubber on the contact surface between the insulation board and the steel beam. The thickness of the elastic gasket is 4 mm, and the compression rate is 25%. The elastic gasket is bonded to the steel structure through epoxy glue. The elastic gasket buffers the vibration transmission of the steel structure and reduces the probability of microcracks on the contact surface.

[0026] Step 8: In this embodiment, the length of the insulation board is 4.5 m, and H-shaped steel stiffeners are added in the middle, with a height of 150 mm and a spacing of 1.0 m. The H-shaped steel stiffeners are connected to the insulation board through embedded buckles, with an embedded buckle spacing of 380 mm and a tensile strength of 12 MPa.

[0027] Furthermore, the H-shaped steel stiffeners are used to suppress the flexural deformation in the middle of the board, and the deflection value is reduced from L / 250 by the traditional method to L / 500; thus, the bending deformation of the board can be more effectively controlled, and cracks can be reduced.

[0028] Step 9: The surface of the insulation board is fully covered with galvanized wire mesh, with a mesh size of 10 mm × 10 mm, a galvanized wire mesh weight of 160 g / m², and the surface of the mesh cloth is coated with KH-550 coupling agent. A shock isolation cushion layer made of 3-mm-thick rubber is laid between the galvanized wire mesh and the insulation board. The dynamic stiffness of the shock isolation cushion layer is 8 MPa, and it is fixed with self-tapping screws at a spacing of 180 mm. The shock isolation cushion layer disperses the external impact load, and the wire mesh improves the crack resistance of the surface layer. After testing, the impact toughness is increased by 30%.

[0029] Step 10: After 7 days of curing, it is detected by a crack observation instrument, and epoxy resin micro-paste is injected into the cracks with a width > 0.1 mm. The epoxy resin micro-paste ratio is: 100 kg of epoxy resin, 30 kg of curing agent, and 15 kg of nano calcium carbonate. After repair, the re-inspection is qualified. Nano calcium carbonate enhances the fluidity and permeability of the paste. Among them, the fluidity is 220 mm, and the actual test shows that the closure rate of micro-cracks is ≥ 95%.

[0030] After testing, the effects of this embodiment are as follows:

[0031] Through the collaborative design of "flexible interface + rigid reinforcement + multi-level protection", this embodiment solves the problem of joint cracking caused by deformation due to material differences in the steel structure insulation board wall. Through actual engineering applications (a certain steel structure factory building with an area of 5000 m²), the acceptance test shows that the crack incidence rate is only 1.2%, which is significantly lower than 18.5% of the traditional process, and it has good economy.

[0032] Embodiment 2 is basically the same as Embodiment 1, except that two-way staggered serrations are laser engraved on the inner side of the U-shaped metal fastener, with a depth of 1.3 mm and a spacing of 10 mm.

[0033] And neutral silicone structural adhesive is coated on the two-way staggered serrations, with a glue layer thickness of 3 mm; The bidirectional staggered serrations form continuous wavy lines on the surface of the adhesive layer. The serrations increase the effective bonding area by 30%. The formed wavy adhesive layer creates a "spring effect" when compressed. After testing, the dynamic shear strength is increased to 2.8 MPa. The low elastic modulus (<1 MPa) of the neutral silicone structural adhesive can absorb the differential deformation of ±4 mm between the steel structure and the insulation board.

[0034] Example 3. This example discloses a method for preventing cracking in the structure of a steel structure insulation board wall, which includes the following steps: Step 1: Weld U-shaped metal fasteners on both sides of the steel structure column (H-shaped steel column, specification: H400×200×8×12). The U-shaped metal fasteners are made of 304 stainless steel, and the wall thickness of the U-shaped metal fasteners is 3 mm. Laser engrave bidirectional staggered serrations on the inner side of the U-shaped metal fasteners. The depth of the bidirectional staggered serrations is 1.2 mm, and the spacing is 10 mm. Apply neutral silicone structural adhesive to the inner wall of the U-shaped metal fasteners. The elastic modulus of the neutral silicone structural adhesive is 0.9 MPa, and the thickness of the applied adhesive is 3 mm. Continuous wavy lines are formed on the surface of the colloid formed by the neutral silicone structural adhesive. The serrations increase the effective bonding area by 30%. The wavy adhesive layer creates a "spring effect" when compressed, and the dynamic shear strength is increased to 2.85 MPa.

[0035] Step 2: Use a polyurethane insulation board with a thickness of 120 mm, embed it in the U-shaped metal fasteners, and apply uniform pressure of 6.5 MPa with a hydraulic press. The pressure holding time is 40 min. During the curing stage, control the temperature and humidity at 25°C and RH60%, and the curing time is 45 hours. Synchronously lift to eliminate local stress concentration. After detection, the void ratio of the adhesive layer is <0.5%, and the actual detection is 0.45%. The peel strength is ≥3.5 kN / m (tested according to GB / T7124).

[0036] Step 3: Cut a groove at the joint of adjacent insulation boards. The groove is an inverted trapezoidal groove. The depth of the inverted trapezoidal groove is 1 / 3 of the board thickness. The upper width of the inverted trapezoidal groove is 15 mm, and the lower width is 10 mm. At the same time, sandblast the side wall of the inverted trapezoidal groove with a roughness Ra = 50 μm to form an "anchor bolt effect" in the inverted trapezoidal groove. Fill polymer mortar in the inverted trapezoidal groove, specifically including: Bottom layer: Cement-based penetrating crystalline waterproof mortar (thickness 10 mm, water-cement ratio 0.28), adding 1.5% nano-aluminum oxide (particle size 15 nm); Middle layer: Polymer anti-cracking mortar (mix ratio: 100 kg of P.O42.5 cement, 150 kg of quartz sand, 8 kg of redispersible latex powder, 0.5 kg of polypropylene fiber, 45 kg of water), thickness 15 mm; Top layer: Spray ultra-high performance mortar containing steel fibers (length 12 mm, diameter 0.2 mm, dosage 2%) (compressive strength 120 MPa), thickness 10 mm.

[0037] Nano-aluminum oxide improves the capillary porosity density of waterproof mortar. Steel fiber mortar enables the impact energy absorption value of the joint to reach 15 J. The nano-modified mortar is filled in a layered manner. Through on-site testing, the pull-out resistance is increased to 9.8 kN, which is significantly higher than that of the V-groove in Example 1.

[0038] Step 4: Cover the surface of the inverted trapezoidal groove with alkali-resistant fiberglass mesh. There are two layers of alkali-resistant fiberglass mesh (the lower layer is 160 g / m², and the upper layer is 300 g / m²). The width of the mesh is 120 mm, the lap joint is 80 mm, and the pressing-in depth accounts for 2 / 3 of the total thickness of the mortar layer. The surface is coated with coupling agent KH-550 (coating amount: 8 g / m²).

[0039] Step 5: Use a laser locator to control the verticality deviation of the joint to be 0.7 mm / m. When installing the upper thermal insulation board, use a 5° wedge-shaped jack with a jacking force of 2.8 kN to ensure that the polymer mortar is filled and overflows.

[0040] Step 6: Spray a water-based fluorocarbon elastic coating (solid content: 70%, elongation: 400%) on the joint surface, with a dry film thickness of 0.8 mm, and construct in two cross-layers; after coating, cover with a self-healing nano-coating (containing microcapsule repair agent, diameter: 50 - 100 μm) to form a functional layer with a thickness of 20 μm. The fluorocarbon coating has an ultraviolet aging resistance grade of ASTM G154, with no chalking after 3000 hours. The microcapsules rupture and release epoxy resin when the crack propagates on the contact surface, achieving self-healing with a crack width ≤ 0.05 mm.

[0041] Step 7: Set an "I"-shaped ethylene propylene diene monomer (EPDM) rubber pad (thickness: 5 mm, Shore hardness: 60 HA) on the contact surface between the thermal insulation board and the steel beam. Longitudinally, stress relief holes (diameter: 20 mm) are opened every 600 mm, with a compression ratio of 25%. The stress relief holes are filled with silicone sealant; the length of the thermal insulation board in this embodiment is 5 m; when ≥ 4 m, a prestressed carbon fiber belt (width: 50 mm, thickness: 1.2 mm, pre-tension: 10 kN) is added to the back of the thermal insulation board and connected to the steel structure through stainless steel clamps. The stress relief holes allow the gasket to deform three-dimensionally under compression to compensate for the thermal expansion of the steel structure by ±3 mm; the carbon fiber belt applies a reverse bending moment to control the maximum deflection of the thermal insulation board within L / 600 (detected by laser scanning).

[0042] Step 8: Centrally add H-shaped steel ribs to the thermal insulation board. The rib height is 180 mm, the spacing of the ribs is 1.0 m, and the ribs are connected to the board body through embedded buckles (tensile strength: 12 MPa) to inhibit the mid-span deflection deformation of the board, with a deflection value ≤ L / 600. The rib height is obtained by calculating 120 mm × 1.5 of the board thickness.

[0043] Step Nine: The galvanized steel wire mesh (mesh size 10mm×10mm) is fully hung on the board surface of the insulation board, and a 3mm thick rubber shock isolation cushion (dynamic stiffness 8MPa) is laid between the insulation board and the steel wire mesh, and fixed by self-tapping screws with a spacing of 180mm between adjacent screws.

[0044] Step Ten: After 7 days of curing, it is detected by a crack observation instrument. For cracks with a width > 0.1mm, epoxy resin micro slurry (mixing ratio: 100kg of epoxy resin, 30kg of curing agent, 15kg of nano calcium carbonate) is injected. The fluidity of the slurry is 220mm, and it is reinspected and qualified after repair.

[0045] The verification of the implementation effect is shown in the following table:

[0046] In this embodiment, the inverted trapezoidal groove and the layered caulking process increase the shear strength to 3.2MPa.

[0047] It should be noted that in practical applications, when the thickness of the insulation board ≤ 100mm, a V-shaped groove is used; when the thickness > 100mm, an inverted trapezoidal groove is used.

[0048] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for treating the anti-cracking structure of a steel structure insulation board wall, characterized in that, It includes the following steps: Step 1: Weld U-shaped metal fasteners on both sides of the steel structure column. The inner side of the U-shaped metal fastener is provided with serrated protrusions, and the inner wall is coated with a neutral silicone structural adhesive with an elastic modulus of 0.8 - 0.9 MPa, and the thickness of the adhesive layer is 2.5 - 3 mm; Step 2: Embed the polyurethane insulation board into the U-shaped metal fastener, apply a pressure of 6 - 6.5 MPa with a hydraulic press and keep the pressure for 35 - 40 min, and cure for 30 - 45 hours to form a flexible transition layer; Step 3: Cut a groove at the joint of adjacent insulation boards. The groove is a V-shaped groove or an inverted trapezoidal groove, and the groove is filled with polymer mortar; Step 4: Cover the surface of the mortar that has not yet set with an alkali-resistant fiberglass mesh cloth, and press it into a depth of 2 / 3 of the thickness of the mortar layer; Step 5: Install the upper insulation board with a wedge-shaped jacking device, and control the perpendicularity deviation with a laser locator to be 0.8 mm / m; Step 6: Spray an elastic waterproof coating on the joint surface, and form a continuous film layer after drying, and the dry film thickness is 0.8 mm; Step 7: Set ethylene propylene diene monomer (EPDM) rubber elastic gaskets on the contact surface between the insulation board and the steel beam; Step 8: Add H-shaped steel ribs in the middle of the back of the insulation board and connect them through embedded buckles; Step 9: Hang a galvanized steel wire mesh on the entire surface of the insulation board, and lay a 3-mm-thick rubber isolation cushion between the steel wire mesh and the insulation board; Step 10: Detect cracks after curing for 7 days, and inject epoxy resin micro-slurry to repair cracks with a width > 0.1 mm.

2. A method for treating the anti-cracking structure of a steel structure insulation board wall according to claim 1, characterized in that: The U-shaped metal fastener in Step 1 is made of 304 stainless steel, and the serrated protrusions include single-direction serrated lines or two-way staggered serrated lines.

3. A method for treating the anti-cracking structure of a steel structure insulation board wall according to claim 1, characterized in that: The elongation at break of the neutral silicone structural adhesive in Step 1 is 450%, and the serrated protrusions form continuous wavy lines on the surface of the adhesive layer.

4. A method for treating the anti-cracking structure of a steel structure insulation board wall according to claim 1, characterized in that: In Step 3, when the groove is a V-shaped groove, the depth of the V-shaped groove is 35 mm and the width is 12 mm; when the groove is an inverted trapezoidal groove, the depth of the inverted trapezoidal groove is 1 / 3 of the board thickness, the upper width of the inverted trapezoidal groove is 15 mm, and the lower width is 10 mm.

5. A method for preventing cracking structure treatment of a steel structure insulation board wall according to claim 1, characterized in that: The mixing ratio of the polymer mortar in Step 3 is: 100 kg of cement, 150 kg of fine sand, 8 kg of EVA powder, 0.8 kg of nano-silica, and 45 kg of water.

6. A method for treating the anti-cracking structure of a steel structure insulation board wall according to claim 1, characterized in that: The spacing of the embedded buckles in Step 8 is 380 mm, and the tensile strength is 12 MPa.

7. A method for preventing cracking structure treatment of a steel structure insulation panel wall according to claim 1, characterized in that: The dynamic stiffness of the isolation cushion in Step 9 is 8 MPa, the gram weight of the galvanized steel wire mesh is 160 g / m², and the surface of the mesh cloth is coated with KH-550 coupling agent.

8. A method for treating the anti-cracking structure of a steel structure insulation board wall according to claim 1, characterized in that: The elastic gasket in Step 7 is in an "I" shape, and stress relief holes with a diameter of 20 mm are opened longitudinally every 600 mm, and the holes are filled with silicone sealant; when the length of the insulation board ≥ 4 m, a prestressed carbon fiber belt is added to the back.

9. A method for treating the anti-cracking structure of a steel structure insulation board wall according to claim 1, characterized in that: The elastic waterproof coating in Step 6 is polyurethane-acrylate or water-based fluorocarbon coating.

10. A method for preventing cracking structure treatment of a steel structure insulation board wall according to claim 1, characterized in that: The mixing ratio of the epoxy resin micro-slurry in Step 10 is 100 kg of epoxy resin, 30 kg of curing agent, 15 kg of nano-calcium carbonate, and the fluidity of the slurry is 220 mm.

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