High-toughness seamless sealing anti-corrosion structure and construction method

Abstract

The invention discloses a high-toughness seamless sealing anti-corrosion structure and a construction method, and belongs to the technical field of bridge cable sealing protection. The high-toughness seamless sealing anti-corrosion structure comprises a fiber cloth composite sealing adhesive tape wrapping the outer surface of a steel member and a sealing wrapping tape wrapping the fiber cloth composite sealing adhesive tape; the fiber cloth composite sealing adhesive tape comprises sealant cast on the outer surface of the steel member in situ and at least one layer of fiber gridding cloth wrapped and immersed in the sealant. The construction method comprises the following steps: S1, casting sealant on the steel member in situ; s2, fiber gridding cloth is wound and wrapped, and the leaked sealant is scraped to be flat; and S3, wrapping and sealing the wrapping tape. Under the combined action of the fiber cloth composite sealing adhesive tape and the sealing wrapping tape, a high-toughness seamless anti-corrosion sealing structure can be formed, the sealing performance of the steel member is guaranteed, meanwhile, under the action of the fiber gridding cloth and the sealing wrapping tape, the structural stability of the sealant can be guaranteed, the use durability is improved, and the service life of the steel member is prolonged. And the problems of early cracking of the sealing structure and corrosion of a steel member (especially a cable) are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge cable sealing and protection, and in particular to a high-toughness seamless sealing and corrosion-resistant structure and a construction method. Background Art

[0002] The load-bearing cable system is considered the lifeline of a cable-structured bridge. The cable system's external protective structure is a key safeguard for ensuring the long-term durability and safe operation of the bridge. A safe and durable external protective structure not only extends the lifespan of the bridge cable system and reduces maintenance costs, but also plays a significant role in ensuring the safe operation of the bridge. Current cable main wires require their external protective structures to provide a long-term seal, isolating them from external oxygen and moisture, thereby preventing corrosion.

[0003] Current anti-corrosion measures generally adopt two approaches: one is the traditional main cable anti-corrosion method, which isolates the internal steel wires of the main cable from the external environment by establishing a sealed protective structure, creating an airless environment to prevent the corrosion of the internal steel wires; the other is to add an active main cable dehumidification system on the premise of ensuring the airtightness of the protection system, and actively reduce the internal humidity of the main cable by injecting dry air to prevent the corrosion of the internal steel wires of the main cable. Both methods require that the protective structure must have a long-term sealing effect. However, a survey of cable-stayed bridges in service in China found that the problem of early cracking of the protective sealing structure outside the cable system, which caused the corrosion of the cable wires, was common.

[0004] Therefore, there is an urgent need for an ideal protective structure with long durability, good sealing effect, and ensuring the long-term performance of inclined cables and slings. Summary of the Invention

[0005] The purpose of the present invention is to solve the above-mentioned technical problems and provide a high-toughness seamless sealing and anti-corrosion structure. Under the joint action of the fiber cloth composite sealing tape and the sealing wrapping tape, a seamless sealing structure can be formed to ensure the sealing of the steel components. At the same time, under the action of the fiber mesh cloth and the sealing wrapping tape, the high toughness of the sealant can be guaranteed, the durability of the sealing structure can be improved, and the problem of early cracking of the sealing structure and rust of the steel components can be avoided. Especially when applied to bridge cables, it can effectively improve the anti-corrosion effect of bridge cables.

[0006] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention discloses a high-toughness seamless sealing and anti-corrosion structure, comprising a fiber cloth composite sealing tape wrapped around the outer surface of a steel component and a sealing wrapping tape wrapped around the outside of the fiber cloth composite sealing tape, the fiber cloth composite sealing tape comprising a sealant cast in place on the outer surface of the steel component and at least one layer of fiber mesh cloth wrapped and immersed in the sealant.

[0007] Preferably, the fiber cloth composite sealing tape is a fiber reinforced nano flame retardant sealing tape, the fiber mesh cloth is a high temperature resistant inorganic fiber mesh cloth, the sealant is a nano flame retardant sealant, and the sealing wrapping tape is a fire resistant and weather resistant sealing wrapping tape.

[0008] Preferably, the nano flame retardant sealant is a single-component nano flame retardant sealant.

[0009] Preferably, the high temperature resistant inorganic fiber mesh cloth is basalt fiber mesh cloth.

[0010] Preferably, the fire-resistant and weather-resistant sealing wrapping tape is basalt fiber cloth impregnated with ceramic silicone rubber.

[0011] Preferably, the thickness of the fiber-reinforced nano flame-retardant sealing tape is 2 mm to 3 mm, and the thickness of the fire-resistant sealing wrapping tape is 0.8 mm to 1.5 mm.

[0012] Also disclosed is a method for constructing a high-toughness seamless sealing anti-corrosion structure, comprising the following steps:

[0013] S1. Cast sealant on the outer surface of the steel component to form an initial adhesive layer;

[0014] S2. Wrapping a fiber mesh cloth on the initial adhesive layer, and evenly scraping the sealant seeping out of the mesh holes of the fiber mesh cloth to ensure that the fiber mesh cloth is completely impregnated;

[0015] S3. Wrapping a sealing tape around the outer surface of the cured fiber cloth composite sealing tape to ensure that there is no leakage of glue or exposed areas.

[0016] Preferably, the sealant is self-curing, with a curing time of ≤24h, and forms a seamless bonding interface with the outer surface of the steel component and the fiber mesh cloth after curing.

[0017] Preferably, in step S4, the wrapping direction of the sealing wrapping tape forms an angle of 45° to 60° with the axial direction of the steel member, in a patchwork form.

[0018] Preferably, the fiber cloth composite sealing tape is a fiber reinforced nano flame retardant sealing tape, the fiber mesh cloth is a high temperature resistant inorganic fiber mesh cloth, the sealant is a nano flame retardant sealant, and the sealing wrapping tape is a fire resistant and weather resistant sealing wrapping tape.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] In the present invention, the outside of steel components (such as steel cables, steel columns, steel beams and other steel components) are wrapped with fiber cloth composite sealing tape and sealing wrapping tape in sequence, wherein the fiber cloth composite sealing tape includes sealant and fiber mesh cloth, and the sealant is cast on the outer surface of the steel component. The pouring method can ensure that there is no exposed area on the outer surface of the steel component, and forms a continuous and seamless sealing layer with the fiber mesh cloth, and forms a seamless bonding interface with the outer surface of the steel component, which can ensure sealing and isolate air. The fiber mesh cloth is wrapped and compounded on the sealant, which can provide effective support for the sealant, so that the sealing structure has high toughness, thereby improving the stability of the sealing structure and improving the durability of the sealing effect. At the same time, when wrapped with the sealing wrapping tape, it can ensure that there is no glue leakage or exposed area on the fiber cloth composite sealing tape, and further improve the sealing and the toughness of the sealing structure, improve the durability of the sealing structure, avoid the problem of early cracking of the sealing structure and causing rust of the steel component, especially the anti-corrosion problem and sealing structure cracking problem applied to bridge cables.

[0021] Other technical solutions of the present invention have achieved the following technical effects compared with the prior art:

[0022] Current anti-corrosion measures are generally unable to achieve high temperature resistance, non-burning and non-drip in a fire environment, that is, they do not have the flame retardant function in an actual fire. The fiber cloth composite sealing tape of the present invention adopts fiber-reinforced nano-flame retardant sealing tape, the fiber mesh cloth adopts high-temperature resistant inorganic fiber mesh cloth, the sealant adopts nano-flame retardant sealant, and the sealing wrapping tape adopts fire-resistant and weather-resistant sealing wrapping tape, all of which are high-temperature resistant and flame retardant materials. In addition to the sealing and anti-corrosion effects, the high-toughness seamless sealing and anti-corrosion structure can also have high-temperature resistance and flame retardant functions, avoiding cracking and burning damage problems caused by high-temperature environments. Experiments have shown that the entire protective structure has the effect of not burning and not dripping in a fire at 1100°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the analysis of these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of the layer structure of the high-toughness seamless sealing anti-corrosion structure in an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the sealing wrapping tape wrapping process in an embodiment of the present invention.

[0026] Explanation of the accompanying reference numerals: 1. cable; 2. fiber cloth composite sealing tape; 3. sealing wrapping tape; 21. sealant; 22. fiber mesh cloth. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a high-toughness seamless sealing and anti-corrosion structure to solve the problems existing in the prior art. Under the joint action of cast-in-place sealant and sealing wrapping tape, the sealing of steel components can be ensured, and under the action of fiber mesh cloth and sealing wrapping tape, the structural stability of the sealant can be ensured, the durability of use can be improved, and the problem of early cracking of the sealing structure and rust of steel components can be avoided.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] like Figures 1 to 2As shown, this embodiment provides a high-toughness seamless sealing anti-corrosion structure, including a fiber cloth composite sealing tape 2 and a sealing wrapping tape 3. The fiber cloth composite sealing tape 2 is wrapped around the outer surface of the steel component (such as the cable 1), and the steel component (such as the cable 1) is sealed in the fiber cloth composite sealing tape 2. The fiber cloth composite sealing tape 2 includes a sealant 21 and a fiber mesh cloth 22. The sealant 21 is cast on the outer surface of the steel component (such as the cable 1). The pouring method can ensure that there is no exposed area on the outer surface of the steel component (such as the cable 1) to ensure sealing and isolate the air. The fiber mesh cloth 22 has at least one layer, and the fiber mesh cloth 22 is wrapped and compounded on the sealant 21 (immersed in the sealant 21) to form a continuous and seamless sealing layer. The fiber mesh cloth 22 can provide effective support for the sealant 21, improve the toughness of the sealing structure, improve stability, and thereby improve the durability of the sealing effect. Sealing tape 3 is wrapped around the fiber-cloth composite sealing tape 2 to ensure there are no leaks or exposed areas on the fiber-cloth composite sealing tape 2, further improving the sealing properties and toughness of the sealing structure, thereby increasing the durability of the sealing structure. The combined action of cast-in-place sealant 21 and sealing tape 3 ensures the sealing of steel components (such as cable 1). The combined action of fiber mesh cloth 22 and sealing tape 3 ensures the structural stability of sealant 21, improving durability and preventing premature cracking of the sealing structure and rusting of the steel components.

[0032] The steel component can be any steel component that requires sealing and anti-corrosion treatment, such as cable 1, steel column, steel beam, etc., especially cable 1, and cable 1 can be any other cable that requires sealing and anti-corrosion treatment, such as bridge cable, cable car cable, etc., especially bridge cable.

[0033] In one embodiment, the fiber cloth composite sealing tape 2 is a fiber-reinforced nano-flame-retardant sealing tape, the fiber mesh cloth 22 is a high-temperature-resistant inorganic fiber mesh cloth, the sealant 21 is a nano-flame-retardant sealant, and the sealing wrapping tape 3 is a fire-resistant and weather-resistant sealing wrapping tape. The combined effect of these three elements allows this high-toughness seamless sealing and anti-corrosion structure to not only provide sealing and anti-corrosion properties, but also possess high-temperature resistance and flame-retardant properties, thereby preventing cracking and burning damage caused by high-temperature environments. Of course, the materials of the aforementioned components may also be other materials, if alternative or more flame-retardant materials are available.

[0034] In one embodiment, the high temperature resistant inorganic fiber mesh cloth (fiber mesh cloth 22) is a basalt fiber mesh cloth. Of course, the high temperature resistant inorganic fiber mesh cloth (fiber mesh cloth 22) can also be made of other high temperature resistant materials.

[0035] In one embodiment, the nano flame retardant sealant (sealant 21 ) is a single-component nano flame retardant sealant.

[0036] In one embodiment, the sealant 21 is a self-curing sealant, and the fiber cloth composite sealing tape 2 is formed by naturally curing the sealant 21 and the fiber mesh cloth 22. After curing, the sealant 21 forms a seamless bonding interface with the outer surface of the steel member (cable 1) and the fiber mesh cloth 22.

[0037] In one embodiment, the fire-resistant and weather-resistant sealing wrapping tape 3 is a basalt fiber cloth impregnated with ceramic silicone rubber. The fire-resistant and weather-resistant sealing wrapping tape 3 can be prefabricated in a factory.

[0038] In one embodiment, the thickness of the fiber cloth composite sealing tape 2 is 2 mm to 3 mm, which can be adjusted according to actual conditions.

[0039] In one embodiment, the thickness of the sealing wrapping tape 3 is 0.8 mm to 1.5 mm, and can be adjusted according to actual conditions.

[0040] In one embodiment, the construction method of the high-toughness seamless sealing and anti-corrosion structure is roughly as follows: cast a single-component nano flame-retardant sealant (sealant 21) on the outer surface of the steel component (such as cable 1), wrap a high-temperature resistant inorganic fiber mesh cloth (fiber mesh cloth 22) on the nano flame-retardant sealant (sealant 21), and after the flame-retardant sealant (sealant 21) seeps out from the mesh, use a scraper to spread the sealant evenly, and then continue to wrap the high-temperature resistant inorganic fiber mesh cloth (sealant 21). After the sealant seeps out from the mesh again, use a scraper to scrape it flat, and there must be no leakage of the mesh cloth. After natural curing, it is immediately wrapped with a fire-resistant and weather-resistant sealing wrapping tape (sealing wrapping tape 3).

[0041] In one embodiment, actual tests have shown that when the thickness of the fiber cloth composite sealing tape 2 is 2 mm to 3 mm, the thickness of the sealing wrapping tape 3 is 0.8 mm to 1.5 mm, the fiber mesh cloth 22 is a double-layer high-temperature resistant inorganic fiber mesh cloth, the sealant 21 is a nano flame-retardant sealant, and the sealing wrapping tape 3 is a fire-resistant and weather-resistant sealing wrapping tape, the overall structural glass transition temperature of this high-toughness seamless sealing and anti-corrosion structure is not less than 1100°C. Within 10 minutes at a high temperature of 1100°C, the steel wire temperature of the steel component (such as the cable 1) does not exceed 300°C, and within 30 minutes at a high temperature of 700°C, the steel wire temperature of the steel component (such as the cable 1) does not exceed 300°C. Under different working conditions, the gas pressure resistance of the protective structure is greater than 0.3 MPa, the elongation of the flame-retardant sealant is not less than 200%, and the sealing gas pressure difference is not less than 0.1 MPa.

[0042] Example 2

[0043] like Figures 1 to 2 As shown, this embodiment provides a high-toughness seamless sealing anti-corrosion structure construction method for forming the high-toughness seamless sealing anti-corrosion structure in Example 1, comprising the following steps:

[0044] S1. Casting sealant 21 on the outer surface of the steel member (such as cable 1) to form an initial adhesive layer;

[0045] S2. Wrap the fiber mesh cloth 22 on the initial adhesive layer and evenly scrape the sealant that seeps out of the mesh holes of the fiber mesh cloth 22. When scraping, make sure that the fiber mesh cloth 22 is completely impregnated. Scraping can be done with a scraper, scraper or other tool.

[0046] S3. Wrap the outer surface of the cured fiber cloth composite sealing tape 2 with a sealing wrapping tape 3 (at least one layer) to ensure that there is no leakage of glue or exposed areas.

[0047] In one embodiment, the sealant 21 is self-curing, with a curing time of ≤24 hours, and forms a seamless bonding interface with the outer surface of the steel component (such as the cable 1 ) and the fiber mesh cloth 22 after curing.

[0048] In one embodiment, in step S4, the wrapping direction of the sealing tape 3 forms an angle a with the axial direction of the steel member (e.g., cable 1). The angle a is between 45° and 60°. The sealing tape 3 is wrapped in a patchwork pattern, and the overlap width W of the wrapping of the sealing tape 3 is ≥ 50% of the width of the cable to ensure a tight seal. Of course, the above parameters (angle a and overlap width) can be adjusted as needed and do not necessarily require the use of the specific parameters described above.

[0049] In one embodiment, the fiber mesh cloth 22 is a high-temperature resistant inorganic fiber mesh cloth, the sealant 21 is a nano flame-retardant sealant, and the sealing wrapping tape 3 is a fire-resistant and weather-resistant sealing wrapping tape. The three work together to make this high-toughness seamless sealing and anti-corrosion structure not only have the sealing and anti-corrosion functions, but also have high-temperature resistance and flame retardant functions, avoiding cracking problems and burning damage problems caused by high-temperature environments.

[0050] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A high-toughness seamless sealing anti-corrosion structure, characterized in that: It includes a fiber cloth composite sealing tape wrapped around the outer surface of the steel component and a sealing wrapping tape wrapped around the fiber cloth composite sealing tape. The fiber cloth composite sealing tape includes a sealant cast on the outer surface of the steel component and at least one layer of fiber mesh cloth wrapped and immersed in the sealant.

2. The high-toughness seamless sealing and anti-corrosion structure according to claim 1 is characterized in that: The fiber cloth composite sealing tape is a fiber reinforced nano flame retardant sealing tape, the fiber mesh cloth is a high temperature resistant inorganic fiber mesh cloth, the sealant is a nano flame retardant sealant, and the sealing wrapping tape is a fire resistant and weather resistant sealing wrapping tape.

3. The high-toughness seamless sealing and anti-corrosion structure according to claim 2 is characterized in that: The nano flame retardant sealant is a single-component nano flame retardant sealant.

4. The high-toughness seamless sealing and anti-corrosion structure according to claim 2, characterized in that: The high temperature resistant inorganic fiber mesh cloth is basalt fiber mesh cloth.

5. The high-toughness seamless sealing and anti-corrosion structure according to claim 2, characterized in that: The fire-resistant and weather-resistant sealing wrapping tape is a basalt fiber cloth impregnated with ceramic silicone rubber.

6. The high-toughness seamless sealing and anti-corrosion structure according to any one of claims 2 to 5, characterized in that: The thickness of the fiber-reinforced nano flame-retardant sealing tape is 2 mm to 3 mm, and the thickness of the fire-resistant sealing wrapping tape is 0.8 mm to 1.5 mm.

7. A method for constructing a high-toughness seamless sealing anti-corrosion structure, characterized in that: The following steps are involved: S1. Cast sealant on the outer surface of the steel component to form an initial adhesive layer; S2. Wrapping a fiber mesh cloth on the initial adhesive layer, and evenly scraping the sealant seeping out of the mesh holes of the fiber mesh cloth to ensure that the fiber mesh cloth is completely impregnated; S3. Wrapping a sealing tape around the outer surface of the cured fiber cloth composite sealing tape to ensure that there is no leakage of glue or exposed areas.

8. The method for constructing a high-toughness seamless sealing and anti-corrosion structure according to claim 7, characterized in that: The sealant is self-curing, with a curing time of ≤24h, and after curing, forms a seamless bonding interface with the outer surface of the steel component and the fiber mesh cloth.

9. The method for constructing a high-toughness seamless sealing and anti-corrosion structure according to claim 7, characterized in that: In step S4, the wrapping direction of the sealing wrapping tape forms an angle of 45° to 60° with the axial direction of the steel member, and the wrapping is done in a patchwork manner.

10. The method for constructing a high-toughness seamless sealing and anti-corrosion structure according to claim 7, characterized in that: The fiber cloth composite sealing tape is a fiber reinforced nano flame retardant sealing tape, the fiber mesh cloth is a high temperature resistant inorganic fiber mesh cloth, the sealant is a nano flame retardant sealant, and the sealing wrapping tape is a fire resistant and weather resistant sealing wrapping tape.

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