Main cable aerogel felt-photocuring wrapping tape fire-resistant and corrosion-resistant system and construction method

Abstract

The invention discloses a main cable aerogel felt-photocuring wrapping tape fire-resistant and corrosion-resistant system and a construction method. The main cable aerogel felt-photocuring wrapping tape fire-resistant and corrosion-resistant system comprises a main cable, and a wire wrapping layer is arranged outside the main cable; a sealing protective layer is arranged outside the wire wrapping layer; a fire-resistant layer is arranged outside the sealing protective layer and comprises an aerogel felt layer and an aluminum foil cloth layer which are arranged from inside to outside; a light-cured composite material wrapping layer is arranged outside the fire-resistant layer, the light-cured composite material wrapping layer is composed of a light-cured composite material wrapping belt, the light-cured composite material wrapping belt structurally comprises three layers, the upper layer and the lower layer are polyurethane modified light-cured resin layers, and the middle layer is a glass fiber layer; and a surface protection layer is arranged outside the photocuring composite material wrapping layer. According to the invention, the fireproof performance of the main cable can be greatly improved and ensured while the fireproof performance of the main cable is good, and due to the photocuring characteristic of the fireproof cable, the fireproof cable is ensured to be convenient to construct and good in economical efficiency, and the whole structural system is efficient, durable and good in decoration.

Description

Technical Field

[0001] The invention relates to a main cable aerogel felt-light-cured wrapping tape fire-resistant and anti-corrosion system and a construction method, belonging to the field of bridge fire resistance and anti-corrosion. Background Art

[0002] Among all the components of suspension bridge structures, the main cable (i.e., suspension cable) is the main load-bearing component of the entire bridge. Its service life runs through the entire life cycle of the bridge and cannot be replaced. Once damaged by fire, it will pose a fatal threat to the safety of the entire structure. In addition, since the steel wire rope used in the main cable is directly exposed to the external environment, it is very susceptible to corrosion by moisture, oxygen and industrial pollutants in the air, which can lead to steel wire breakage and reduce the load-bearing capacity of the main cable. Therefore, its anti-corrosion technology has always been the focus of attention of engineering and technical personnel.

[0003] At present, the main cable anti-corrosion system is mainly divided into two categories: one is the vulcanized sealant coating protection system, and the other is the wrapping tape sealing protection system. Both systems have achieved good results in anti-corrosion protection. In recent years, with the continuous extension of the design life of bridges and the gradual emergence of potential problems in the existing main cable anti-corrosion system, in order to further improve the anti-corrosion effect, reliability and durability of the cable, the anti-corrosion technology of adding dry air ventilation inside the cable has been widely used.

[0004] With the rapid development of road transportation, the global transportation volume of petrochemicals has also increased rapidly. In recent years, bridge fires caused by the transportation of hazardous chemicals have occurred from time to time. Once a truck loaded with flammable and explosive materials catches fire, the transient high temperature generated by the combustion will rapidly increase the temperature of the suspension bridge cable system, connection nodes and steel main beams through thermal convection and radiation, resulting in a significant decrease in the mechanical properties of these parts. This not only brings huge safety risks to road transportation, especially bridge construction, but may also cause serious loss of life and property. With the increase in traffic volume and the increasingly close urban space, the risks faced by transportation infrastructure are increasing. Fire, as one of the important risks, has a relatively high frequency of occurrence, which brings huge challenges to bridge structures in construction and operation. Therefore, the fire resistance of bridges is receiving more and more attention, and corresponding fire resistance measures need to be taken from the main structure to key components. Summary of the invention

[0005] Purpose of the invention: In view of the problems in the prior art such as insufficient stability of the fireproof structure of the aerogel felt layer under fire, fission and reduction of thickness of the aerogel felt at high temperature, poor environmental protection of the entire anti-corrosion and fireproof structure, and uneven curing of the traditional bridge main cable wrapping tape during heating and pressurization during construction, the present invention provides a combined anti-corrosion system of aerogel felt fire-resistant and photocuring composite material wrapping tape for the main cable of a suspension bridge and a construction method. While solving the above-mentioned problems, the system can not only meet the reliability and durability of the anti-corrosion of the bridge main cable, but also ensure its fireproof performance in hydrocarbon fire scenarios.

[0006] The technical solution adopted by the present invention is: a main cable aerogel felt-light-cured wrapping tape fire-resistant and anti-corrosion system, comprising a main cable, a plurality of locking clamps are arranged at intervals along the length direction of the main cable, and a ring-seam sealing layer is provided at the connection between the main cable and the locking clamp to seal the gap between the end of the locking clamp and the main cable; the main cable comprises a cable steel wire bundle, and the surface of the cable steel wire bundle is provided with a winding layer, a sealing protection layer, a fire-resistant layer, a light-cured composite material wrapping layer and a surface protection layer in sequence from the inside to the outside;

[0007] The sealing protective layer is a silane-modified sealing rubber layer;

[0008] The fire-resistant layer is provided with an aerogel felt layer and an aluminum foil cloth layer in sequence from the inside to the outside;

[0009] The light-curing composite material wrapping layer is a light-curing composite material wrapping tape;

[0010] The surface protection layer is a fireproof topcoat layer.

[0011] Preferably, the thickness of the silane modified sealant layer is 0.200mm-3mm. The silane modified sealant can also be flame retardant to form a flame retardant sealing protective layer, the thickness of which can be optimized to 0.5mm to 1mm. Existing silane modified sealant layers can withstand temperatures above 120°C, while the flame retardant sealing protective layer is not only resistant to high temperatures, but also has extremely low flammability, and will not release a large amount of heat in a fire or cause the flame to spread, thereby reducing the risk of cable damage by fire.

[0012] Preferably, the thickness of the aerogel felt in the aerogel felt layer is 10 mm-20 mm; it can be further preferably 10 mm-15 mm according to the fire protection requirements of the cable, or 10 mm, 15 mm or 20 mm can be directly selected according to the fire protection requirements of the cable.

[0013] Preferably, the aluminum foil cloth in the aluminum foil cloth layer is one layer with a thickness of 1 mm-3 mm.

[0014] Preferably, the thickness of the light-curing composite material wrapping tape in the light-curing composite material wrapping layer is 1.5 mm-2.5 mm, and 1.5 mm, 2.0 mm or 2.5 mm can be directly selected according to the cable diameter or fire protection requirements.

[0015] Preferably, the light-curable composite material wrapping tape structure in the light-curable composite material wrapping layer is a three-layer structure, wherein the upper and lower layers are polyurethane-modified light-curable resin layers, and the middle layer is a glass fiber layer.

[0016] Preferably, the fire retardant topcoat layer in the surface protective layer has a thickness of 60 μm-80 μm.

[0017] The surfaces of the cable wire bundles and the winding wire layer are not coated with paint coating. The main considerations are as follows: first, this can reduce the pollution of the construction site to the environment; second, the existing cables have adopted dry air ventilation technology, so there is no need to add two additional coating processes, and these two coatings only cover the outer surface of the cable wire bundles and winding wires, and the anti-corrosion effect is limited; finally, reducing these two coatings can further reduce the fire and anti-corrosion construction costs of the cables.

[0018] The construction method of the main cable aerogel felt-light-cured wrapping tape fire-resistant and anti-corrosion system comprises the following steps:

[0019] Step 1: Construction preparation, including scheme optimization, arrangement of materials, equipment and personnel, and construction platform;

[0020] Step 2: Pre-treatment of the main cable: first use a hard brush or other cleaning tools to remove dust, rust and other debris on the coating surface, then use a cleaning cloth or absorbent cotton yarn dipped in a cleaning solvent to wipe in the same direction to remove oil and salt stains on the surface until there is no obvious stain on the paper cleaning cloth;

[0021] Step 3: Construction of the sealant layer: Apply the silane-modified sealant on the clean surface of the wire wrapping layer;

[0022] Step 4: Construction of fire-resistant layer. After the sealant layer is formed, use a manual and automatic tape wrapping machine to wrap from the low-position cable clamp to the high-position cable clamp, lay the aerogel felt on the surface of the sealant layer, and complete the vertical winding work in a 5% overlap manner. Then use a stainless steel clamp for final fixation, and finally wrap the aluminum foil cloth around the outer layer of the aerogel felt. After wrapping, ensure the surface is flat;

[0023] Step 5: Construction of light-curing composite material wrapping layer: Wrap the light-curing composite material wrapping tape outside the fire-resistant layer, and use a manual and automatic wrapping machine to complete the oblique wrapping work in a 52% stacking manner. No heating is required, and ultraviolet curing is used to ensure that the spacing between each circle is equal;

[0024] Step 6: Construction of surface protection layer. After the light-curing wrapping tape is cured, apply a layer of fire-retardant topcoat on its surface to ensure that the surface is smooth and beautiful.

[0025] Step 7: Quality inspection: the surface of the fire-resistant layer and the light-curing wrapping layer should be flat, without bubbles or damage; after wrapping, the two adjacent layers of wrapping tape should not be separated when the index finger is used to pick the seam between them; after the wrapping tape is completed, no leakage should be detected when the air tightness test is done with soapy water. According to the construction process, from step 3 to step 6, if any step fails, return to that step for construction and repair;

[0026] Step 8: Anti-slip treatment of the main cable: apply a 20mm wide glue tape on the top of the main cable and sprinkle a layer of quartz sand on the glue tape;

[0027] Step 9: After the construction of the main cable protection system is completed, the main cable and the cable clamp ends are sealed outside the seam to form a ring seam sealing layer.

[0028] The thickness of each layer in the above-mentioned main cable aerogel felt-light-cured wrapping tape fire-resistant and anti-corrosion system is determined according to the fire resistance limit and critical temperature that need to be met after protection.

[0029] The beneficial effects of the present invention are as follows: 1. The main cable of the suspension bridge adopts aerogel felt as the main fireproof material, and combines it with aluminum foil cloth to form an efficient fireproof layer. At the same time, a light-cured composite material wrapping tape layer is used as the main anti-corrosion layer. The anti-corrosion and fireproof structural design of the cable avoids the use of paint coating, and achieves green environmental protection while ensuring that the cable has reliable anti-corrosion and fireproof performance.

[0030] 2. After sample preparation and testing, the structure of the present invention meets the sealing protection requirements of the cable and the protection requirements under hydrocarbon fire scenes. The test shows that the dry air pressure inside the cable is well maintained. In the simulated hydrocarbon fire scene, the surface temperature of the cable steel wire did not exceed 300°C within 60 minutes, showing excellent technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a general schematic diagram of the suspension bridge of the present invention;

[0032] Figure 2 This is a three-dimensional diagram of the main cable of the present invention;

[0033] Figure 3 is a cross-sectional schematic diagram of the main cable of the present invention;

[0034] Figure 4 It is a cross-sectional view of the fire protection unit of the present invention;

[0035] Figure 5 It is a cross-sectional view of the wrapping layer of the light-cured composite material of the present invention;

[0036] Figure 6 is a schematic longitudinal section diagram of the main cable of the present invention;

[0037] Figure 7 It is a flow chart of the working method of the present invention;

[0038] In the figure: 1. Cable wire bundle; 2. Wire wrapping layer; 3. Sealing protection layer; 4. Fire-resistant layer; 4-1. Aerogel felt layer; 4-2. Aluminum foil cloth layer; 5. Photocurable composite material wrapping layer; 5-1. Polyurethane modified photocurable resin layer; 5-2 Glass fiber layer; 6. Surface protection layer. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] like Figure 1-6 As shown, a main cable aerogel felt-light-cured wrapping tape fire-resistant and anti-corrosion system includes a main cable, on which a plurality of locking clamps are arranged at intervals along the length direction of the main cable, and a ring-seam sealing layer is provided at the connection between the main cable and the locking clamp to seal the gap between the end of the locking clamp and the main cable; the main cable includes a cable steel wire bundle 1, and the surface of the cable steel wire bundle 1 is provided with a winding layer 2, a sealing protection layer 3, a fire-resistant layer 4, a light-cured composite material wrapping layer 5 and a surface protection layer 6 from the inside to the outside; the fire-resistant layer 4 is provided with an aerogel felt layer 4-1 and an aluminum foil cloth layer 4-2 in sequence from the inside to the outside; the light-cured composite material wrapping layer 5 is a light-cured composite material wrapping tape; the light-cured composite material wrapping layer 5 has a three-layer structure, the upper and lower layers are both polyurethane-modified light-cured resin layers 5-1, and the middle layer is a glass fiber layer 5-2; the surface protection layer 6 is a fire-resistant topcoat layer;

[0042] The sealing protection layer 3 is a sulfurized silane modified sealant layer, which is formed by coating the sulfurized silane modified sealant on the clean surface of the wire winding layer 2, and has a thickness of 0.5 mm.

[0043] After the sealing protection layer 3 is formed and before the vulcanization is completed, a 10 mm thick aerogel felt is paved on the surface of the sealing protection layer 3. After the paving is smooth and the seams are tight, the aerogel felt layer 4-1 is formed.

[0044] On the surface of the aerogel felt layer 4-1, an aluminum foil cloth is wrapped on the aerogel felt layer in a single pass to form an aluminum foil cloth layer 4-2, and the thickness is controlled to be 1 mm.

[0045] A light-cured composite wrapping tape is used, and the wrapping tape is wrapped around the main cable in a direction parallel to the locking clamp and completely overlapped once to form a double-layer overlap, and then gradually moves upward and wraps around the aluminum foil cloth layer 4-2. The thickness of the single-layer wrapping tape is 1.5 mm, and the overlap rate of each wrapping is 52%.

[0046] Finally, two layers of fire retardant topcoat with a thickness of 80 μm were applied on the surface of the light-curing composite material wrapping tape.

[0047] The total thickness of the entire combined system is about 8mm-12mm.

[0048] The construction method of the main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system comprises the following steps: Figure 7 As shown,

[0049] Step 1: Construction preparation, including scheme optimization, arrangement of materials, equipment and personnel, and construction platform.

[0050] Step 2: Pre-treatment of the main cable: first use a hard brush or other cleaning tools to remove dust, rust and other debris on the coating surface, then use a clean cloth or absorbent cotton gauze dipped in a cleaning solvent to wipe in the same direction to remove oil, salt and other dirt on the surface until there is no obvious stain on the paper cleaning cloth.

[0051] Step 3: Construction of sealant layer: Apply silane modified sealant on the clean surface of the wire wrapping layer.

[0052] Step 4: Construction of fire-resistant layer. After the sealant layer is formed, use a manual and automatic tape wrapping machine to wrap from the low-position cable clamp to the high-position cable clamp, lay the aerogel felt on the surface of the sealant layer, and complete the vertical winding work in a 5% overlap manner. Then use a stainless steel clamp for final fixation, and finally wrap the aluminum foil cloth around the outer layer of the aerogel felt. After wrapping, ensure the surface is flat.

[0053] Step 5: Construction of light-curing composite material wrapping layer. Wrap the light-curing composite material wrapping tape outside the fire-resistant layer. Use a manual and automatic wrapping machine to complete the oblique wrapping work in a 52% stacking manner. No heating is required. Ultraviolet curing is used to ensure that the spacing between each circle is equal.

[0054] Step 6: Construction of surface protection layer. After the light-curing wrapping tape is cured, apply a layer of fire-retardant topcoat on its surface to ensure that the surface is smooth and beautiful.

[0055] Step 7: Quality inspection. The surface of the fire-resistant layer and the light-curing wrapping layer should be flat, without bubbles or damage. After wrapping, the two adjacent layers of wrapping tape should not be separated when the index finger is used to pick the seam between them. After the wrapping tape is completed, no leakage should be detected when the air tightness test is performed with soapy water. According to the construction process, from step three to step six, if any step fails, return to that step for construction and repair.

[0056] Step 8: To prevent the main cable from slipping, apply a 20mm wide adhesive tape on the top of the main cable and sprinkle a layer of quartz sand on the adhesive tape.

[0057] Step 9: After the construction of the main cable protection system is completed, the main cable and the cable clamp ends are sealed outside the seam to form a ring seam sealing layer.

[0058] Example 2

[0059] like Figure 1-6 As shown, a main cable aerogel felt-light-cured wrapping tape fire-resistant and anti-corrosion system includes a main cable, on which a plurality of locking clamps are arranged at intervals along the length direction of the main cable, and a ring-seam sealing layer is provided at the connection between the main cable and the locking clamp to seal the gap between the end of the locking clamp and the main cable; the main cable includes a cable steel wire bundle 1, and the surface of the cable steel wire bundle 1 is provided with a winding layer 2, a sealing protection layer 3, a fire-resistant layer 4, a light-cured composite material wrapping layer 5 and a surface protection layer 6 from the inside to the outside; the fire-resistant layer 4 is provided with an aerogel felt layer 4-1 and an aluminum foil cloth layer 4-2 in sequence from the inside to the outside; the light-cured composite material wrapping layer 5 is a light-cured composite material wrapping tape; the light-cured composite material wrapping layer 5 has a three-layer structure, the upper and lower layers are both polyurethane-modified light-cured resin layers 5-1, and the middle layer is a glass fiber layer 5-2; the surface protection layer 6 is a fire-resistant topcoat layer;

[0060] The sealing protection layer 3 is a sulfurized silane modified sealant layer, which is formed by coating the sulfurized silane modified sealant on the clean surface of the wire winding layer 2, and has a thickness of 0.8 mm.

[0061] After the sealing protection layer 3 is formed and before the vulcanization is completed, a 15 mm thick aerogel felt is paved on the surface of the sealing protection layer 3. After the paving is smooth and the seams are tight, the aerogel felt layer 4-1 is formed.

[0062] On the surface of the aerogel felt layer 4-1, an aluminum foil cloth is wrapped on the aerogel felt layer in a single pass to form an aluminum foil cloth layer 4-2, and the thickness is controlled at 2 mm.

[0063] A light-cured composite wrapping tape is used, and the wrapping tape is wrapped around the main cable in a direction parallel to the locking clamp and completely overlapped once to form a double-layer overlap, and then gradually moves upward and wraps around the aluminum foil cloth layer 4-2. The thickness of the single-layer wrapping tape is 2 mm, and the overlap rate of each wrapping is 52%.

[0064] Finally, two layers of fire retardant topcoat with a thickness of 70 μm were applied on the surface of the light-curing composite material wrapping tape.

[0065] The total thickness of the entire combined system is about 6.5mm-9.5mm, and the construction method is the same as that of Example 1.

[0066] Example 3

[0067] like Figure 1-6As shown, a main cable aerogel felt-light-cured wrapping tape fire-resistant and anti-corrosion system includes a main cable, on which a plurality of locking clamps are arranged at intervals along the length direction of the main cable, and a ring-seam sealing layer is provided at the connection between the main cable and the locking clamp to seal the gap between the end of the locking clamp and the main cable; the main cable includes a cable steel wire bundle 1, and the surface of the cable steel wire bundle 1 is provided with a winding layer 2, a sealing protection layer 3, a fire-resistant layer 4, a light-cured composite material wrapping layer 5 and a surface protection layer 6 from the inside to the outside; the fire-resistant layer 4 is provided with an aerogel felt layer 4-1 and an aluminum foil cloth layer 4-2 in sequence from the inside to the outside; the light-cured composite material wrapping layer 5 is a light-cured composite material wrapping tape; the light-cured composite material wrapping layer 5 has a three-layer structure, the upper and lower layers are both polyurethane-modified light-cured resin layers 5-1, and the middle layer is a glass fiber layer 5-2; the surface protection layer 6 is a fire-resistant topcoat layer;

[0068] The sealing protection layer 3 is a sulfurized silane modified sealant layer, which is formed by coating the sulfurized silane modified sealant on the clean surface of the wire winding layer 2, and has a thickness of 1 mm.

[0069] After the sealing protection layer 3 is formed and before the vulcanization is completed, a 20 mm thick aerogel felt is paved on the surface of the sealing protection layer 3. After the paving is smooth and the seams are tight, the aerogel felt layer 4-1 is formed.

[0070] On the surface of the aerogel felt layer 4-1, an aluminum foil cloth is wrapped on the aerogel felt layer in a single pass to form an aluminum foil cloth layer 4-2, and the thickness is controlled at 3 mm.

[0071] A light-cured composite wrapping tape is used, and the wrapping tape is wrapped around the main cable in a direction parallel to the locking clamp and completely overlapped once to form a double-layer overlap, and then gradually moves upward and wraps around the aluminum foil cloth layer 4-2. The thickness of the single-layer wrapping tape is 2.5 mm, and the overlap rate of each wrapping is 52%.

[0072] Finally, a layer of fire-retardant topcoat with a thickness of 60 μm is applied on the surface of the light-curing composite material wrapping tape.

[0073] The total thickness of the entire combined system is about 6.5mm-9.5mm, and the construction method is the same as that of Example 1.

[0074] Comparative Example 1 is an existing cable vulcanization sealing and anti-corrosion structural system, which is treated with fluorocarbon topcoat.

[0075] Comparative Example 2 is an existing cable chlorosulfonated polyethylene wrapping tape sealing and anti-corrosion structural system.

[0076] The main performance test data and comparative test results of the aerogel felt fire resistance and light-curing wrapping tape anti-corrosion combination system involved in this patent are detailed in Table 1.

[0077] Table 1

[0078]

[0079] According to the comparison of the test data in Table 1, the experimental results show that this example performs well in fire resistance and corrosion resistance, and the reliability and durability of the structural design are better than those of the comparative samples.

[0080] This application has good anti-corrosion performance and can greatly improve and guarantee its fire resistance. At the same time, it is easy to construct and has good economy. The entire structural system is funny, durable and decorative, and has significant social and economic benefits.

[0081] In addition to the above embodiments, this patent also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection required by this patent.

Claims

1. Main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system, characterized by: It comprises a main cable, on which a plurality of locking clips are arranged at intervals along the length direction of the main cable, and a ring-shaped sealing layer is provided at the connection between the main cable and the locking clip to seal the gap between the end of the locking clip and the main cable; the main cable comprises a cable steel wire bundle, and the surface of the cable steel wire bundle is provided with a wire wrapping layer, a sealing protective layer, a fire-resistant layer, a wrapping layer, an anti-corrosion layer and a surface protective layer in sequence from the inside to the outside; The sealing protective layer is a silane-modified sealing rubber layer; The fire-resistant layer is provided with an aerogel felt layer and an aluminum foil cloth layer in sequence from the inside to the outside; The light-curing composite material wrapping layer is a light-curing composite material wrapping tape; The surface protection layer is a fireproof topcoat layer.

2. The main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system according to claim 1 is characterized by: The thickness of the silane modified sealant layer is 0.2 mm to 3 mm.

3. The main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system according to claim 2 is characterized by: The silane modified sealant layer is a flame retardant sealing protective layer, and the thickness thereof is 0.5 mm to 1 mm.

4. The main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system according to claim 3 is characterized by: The thickness of the aerogel felt in the aerogel felt layer is 10 mm to 15 mm.

5. The main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system according to claim 4 is characterized by: The aluminum foil cloth in the aluminum foil cloth layer is a single layer with a thickness of 1mm-3mm.

6. The main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system according to claim 5 is characterized by: The thickness of the light-curing composite material wrapping tape in the light-curing composite material wrapping layer is 1.5 mm to 2.5 mm.

7. The main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system according to claim 6 is characterized by: The light-curable composite material wrapping tape structure in the light-curable composite material wrapping layer is three-layered, the upper and lower layers are polyurethane-modified light-curable resin layers, and the middle layer is a glass fiber layer.

8. The main cable aerogel felt-light-cured wrapping tape fire resistant and anti-corrosion system according to claim 7 is characterized by: The surface protection layer has a thickness of 60 μm-80 μm.

9. The construction method of the main cable aerogel felt-light-cured wrapping tape fire-resistant and anti-corrosion system according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that: The steps include: Step 1: Construction preparation, including scheme optimization, arrangement of materials, equipment and personnel, and construction platform; Step 2: Pre-treatment of the main cable: first use a hard brush or other cleaning tools to remove dust, rust and other debris on the coating surface, then use a cleaning cloth or absorbent cotton yarn dipped in a cleaning solvent to wipe in the same direction to remove oil and salt stains on the surface until there is no obvious stain on the paper cleaning cloth; Step 3: Construction of the sealant layer: Apply the silane-modified sealant on the clean surface of the wire wrapping layer; Step 4: Construction of fire-resistant layer. After the sealant layer is formed, use a manual and automatic tape wrapping machine to wrap from the low-position cable clamp to the high-position cable clamp, lay the aerogel felt on the surface of the sealant layer, and complete the vertical winding work in a 5% overlap manner. Then use a stainless steel clamp for final fixation, and finally wrap the aluminum foil cloth around the outer layer of the aerogel felt. After wrapping, ensure the surface is flat; Step 5: Construction of light-curing composite material wrapping layer: Wrap the light-curing composite material wrapping tape outside the fire-resistant layer, and use a manual and automatic wrapping machine to complete the oblique wrapping work in a 52% stacking manner. No heating is required, and ultraviolet curing is used to ensure that the spacing between each circle is equal; Step 6: Construction of surface protection layer. After the light-curing wrapping tape is cured, apply a layer of fire-retardant topcoat on its surface to ensure that the surface is smooth and beautiful. Step 7: Quality inspection: the surface of the fire-resistant layer and the light-curing wrapping layer should be flat, without bubbles or damage; after wrapping, the two adjacent layers of wrapping tape should not be separated when the index finger is used to pick the seam between them; after the wrapping tape is completed, no leakage should be detected when the air tightness test is done with soapy water. According to the construction process, from step 3 to step 6, if any step fails, return to that step for construction and repair; Step 8: Anti-slip treatment of the main cable: apply a 20mm wide glue tape on the top of the main cable and sprinkle a layer of quartz sand on the glue tape; Step 9: After the construction of the main cable protection system is completed, the main cable and the cable clamp ends are sealed outside the seam to form a ring seam sealing layer.

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