A double-ply plate connection anti-corrosion structure for beams and columns in corrosive coastal environments

Abstract

This utility model relates to a double-clamped anti-corrosion structure for beams and columns in corrosive coastal environments. It includes an embedded steel plate pre-embedded in a concrete column. A steel beam is connected to the embedded steel plate via two clamps. The two clamps are detachably fixed to both sides of the steel beam, with the same side of each clamp fixed to the embedded steel plate. A gap is formed between one side of the steel beam and the embedded steel plate. The two clamps are located on the upper and lower sides of the gap, forming openings at both ends. The gap is filled with epoxy primer and sealant. By filling the cavity between the two clamps and the steel beam and the embedded steel plate with epoxy primer and high-temperature resistant single-component silicone sealant, this structure solves the technical problems of high-temperature welding damaging the anti-corrosion layer and cavity corrosion leading to rust seepage in coastal environments. This structure extends the maintenance cycle by more than three times, significantly reduces the total life-cycle cost, and is suitable for corrosive environments such as ports and chemical plants.

Description

Technical Field

[0001] This utility model relates to the field of steel structure connection and corrosion protection technology, and in particular to a double-clamped anti-corrosion structure for beam-column connection in coastal corrosive environments. Background Technology

[0002] The Industrial Revolution led to a surge in large-scale production and manufacturing capabilities, resulting in a significant increase in steel output and providing a material foundation for the widespread application of steel structures. The growing demand for large, high-rise, complex, and multifunctional buildings rendered traditional brick and wood structures inadequate, making steel structures an ideal choice due to their high strength, light weight, and rapid construction. Advances in materials mechanics and structural mechanics have deepened our understanding of the stress performance and connection methods of steel structures, providing theoretical support for designing more rational and safer connection nodes. Continuous updates to modern construction technologies and equipment, such as cranes and welding equipment, have made the installation and connection of steel structures more efficient and precise. To ensure the quality and safety of steel structure connections, relevant standards and specifications have been gradually established and improved, imposing strict regulations on the design, construction, and acceptance of connections. In some cases, steel structure connection technology can shorten construction cycles, reduce overall costs, and improve economic efficiency, further promoting its widespread application.

[0003] In earthquake-prone areas, the excellent seismic performance of steel structures and reasonable connection methods are crucial for ensuring the safety of buildings during earthquakes. Steel structures are recyclable and reusable, meeting the requirements of sustainable development, and effective connection technologies facilitate the recycling of steel structures. In summary, steel structure connection technology is constantly developing and improving under the combined influence of industrial, architectural, economic, and sustainable development factors. In steel structures, beam-column connections are the most critical link, especially in corrosive environments. Ensuring that the external environment does not affect the connection nodes is particularly important. In coastal corrosive environments, it is necessary to consider whether anti-corrosion measures will reduce the material strength of beam-column connections, maintenance cycles and costs, and aesthetic requirements.

[0004] In existing technologies, steel structure connections face significant corrosion challenges in coastal areas, primarily due to the following factors:

[0005] High humidity and salt spray environment: Coastal areas have high air humidity, which easily forms a water film on the surface of steel structures, providing the necessary medium for corrosion. Salt spray in the air contains a large number of chloride ions, which accelerates the corrosion process of steel structures.

[0006] The unique characteristics of connection points: Steel structure connection points (such as welds and bolted joints) often exhibit geometric changes and stress concentrations, making corrosion more likely to occur and develop in these areas. Gaps at the connection points can accumulate moisture and impurities, further increasing the risk of corrosion.

[0007] Damage to the anti-corrosion coating: During the processing, transportation, and installation of steel structures, the anti-corrosion coating at the joints may be damaged, causing the metal to be directly exposed to a corrosive environment. Aging and peeling of the coating will also reduce its protective effect.

[0008] Electrochemical corrosion: When different metal materials are connected (such as steel and stainless steel bolts), electrochemical corrosion may occur due to potential differences. In steel structure beam-column connections constructed in corrosive environments, a double-plate connection method is often used. Due to construction procedures, if anti-corrosion measures are applied after the first plate is welded, the high temperature during the on-site welding of the second plate can damage the anti-corrosion material, rendering it ineffective. If the environmental corrosion effect within the double-plate cavity is not addressed, it will affect the steel's long-term corrosion resistance, significantly shortening the maintenance cycle and increasing later maintenance costs. In coastal environments with abundant moisture, long-term corrosion can lead to the exudation of brown rust water, affecting the aesthetics.

[0009] In summary, existing anti-corrosion solutions suffer from problems such as short maintenance cycles, high long-term costs, and poor aesthetics. Utility Model Content

[0010] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a double-ply plate connection anti-corrosion structure for beams and columns in coastal corrosive environments. This structure is resistant to high welding temperatures, isolates corrosive media, and extends the maintenance cycle.

[0011] The above-mentioned utility model objective is achieved through the following technical solution:

[0012] A double-clamped anti-corrosion structure for beams and columns in corrosive coastal environments includes a pre-embedded steel plate embedded in a concrete column. A steel beam is connected to the pre-embedded steel plate by two clamps. The two clamps are detachably fixed to both sides of the steel beam. The same side of the two clamps is fixedly connected to the pre-embedded steel plate. A gap is provided between one side of the steel beam and the pre-embedded steel plate. The two clamps are located on the upper and lower sides of the gap and form openings at both ends of the gap. The gap is used to fill epoxy primer and sealant.

[0013] As a further technical solution of this utility model: the epoxy primer is filled in the middle part of the gap, and the openings on the upper and lower sides of the gap are filled with the sealant.

[0014] As a further technical solution of this utility model: the sealant is a single-component structural assembly silicone sealant.

[0015] As a further technical solution of this utility model: the two clamping plates are connected to both sides of the steel beam by a number of fasteners.

[0016] As a further technical solution of this utility model: the fastener includes a bolt and a nut, one end of the bolt passes through the first clamping plate, the steel beam and the other clamping plate in sequence and is then threadedly connected to the nut.

[0017] As a further technical solution of this utility model: the two clamping plates are welded to the pre-embedded steel plate on the same side.

[0018] As a further technical solution of this utility model: one of the clamping plates is welded to the embedded steel plate by double-sided fillet welds, and the other clamping plate is welded to the other by single-sided welds.

[0019] In summary, this utility model has at least one of the following beneficial technical effects:

[0020] This utility model discloses a double-plate connection anti-corrosion structure for beams and columns in corrosive coastal environments. By filling the cavity between the two plates and between the steel beam and the embedded steel plate with epoxy primer and high-temperature resistant single-component silicone sealant, it solves the technical problems of high-temperature welding damaging the anti-corrosion layer and cavity corrosion leading to rust seepage in coastal environments. This structure extends the maintenance cycle by more than three times, significantly reduces the total life cycle cost, and is suitable for corrosive environments such as ports and chemical plants. Attached Figure Description

[0021] Figure 1 This is a front view of the present invention.

[0022] Figure 2 This is a top view of the present invention.

[0023] Figure 3 for Figure 2 A magnified view of a section of the middle plywood.

[0024] Reference numerals: 1. Concrete column; 10. Steel beam; 2. Embedded steel plate; 3. Clamping plate; 4. Gap; 5. Epoxy primer; 6. Sealant; 7. Fastener; 71. Bolt; 72. Nut; 8. Double-sided fillet weld; 9. Single-sided weld. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Example 1:

[0029] Reference Figure 1 This utility model discloses a double-clamped anti-corrosion structure for beams and columns in coastal corrosive environments, including a pre-embedded steel plate 2 embedded in a concrete column 1, a steel beam 10 connected to the pre-embedded steel plate 2 by two clamps 3, the two clamps 3 being detachably fixed on both sides of the steel beam 10, the same side of the two clamps 3 being fixedly connected to the pre-embedded steel plate 2, a gap 4 being provided between one side of the steel beam 10 and the pre-embedded steel plate 2, the two clamps 3 being located on the upper and lower sides of the gap 4 respectively and forming openings at both ends of the gap 4, the gap 4 being used to fill epoxy primer 5 and sealant 6.

[0030] Epoxy primer 5 fills the middle part of the gap 4, and sealant 6 fills the openings on the top and bottom sides of the gap 4. The sealant 6 is a single-component structural assembly silicone sealant. The two clamping plates 3 are connected to both sides of the steel beam 10 by several fasteners 7. (Refer to...) Figure 2 Fastener 7 includes a bolt 71 and a nut 72. One end of the bolt 71 passes sequentially through the first clamping plate 3, the steel beam 10, and the other clamping plate 3 before being threaded onto the nut 72. The two clamping plates 3 are welded to the embedded steel plate 2 on the same side. (Refer to...) Figure 3 One of the clamping plates 3 is welded to the embedded steel plate 2 using a double-sided fillet weld 8, while the other clamping plate 3 is welded to the other using a single-sided weld 9.

[0031] The design process for corrosion protection in double-ply beam-column connections is one of the most crucial aspects of the entire research and development process. This process requires consideration of multiple factors, such as corrosion resistance, UV protection, high-temperature resistance, low-temperature resistance, and waterproofing, among other environmental factors. During the design phase, appropriate materials, technologies, and construction techniques must be selected based on market demands and technological trends. Furthermore, innovative structural design and optimization of various parameters are necessary to ultimately achieve an efficient, stable, and reliable cavity design for double-ply beam-column connections.

[0032] Material selection is another essential step in the research and development process. Based on the different usage environments mentioned above, appropriate materials need to be selected, such as suitable primers, gaskets, sealants, and masking layers. Therefore, material selection must be evaluated according to different usage environments and application scenarios, and corresponding physicochemical tests must be conducted to ensure the superior performance of the materials.

[0033] For double-ply beam-column connections, structural design is crucial for improving durability. The R&D team needs to optimize material usage to achieve maximum economic efficiency while ensuring the steel's basic weather resistance. Simultaneously, the team also needs to consider reducing construction complexity to simplify on-site installation, maintenance, and cleaning processes. Based on these requirements, the structural design should consider how to maximize the product's efficiency and role.

[0034] The beam-column connection in a steel structure is the most crucial structural connection. To enhance the reliability of this connection in a corrosive coastal environment, a double-ply plate connection method is employed. However, this method creates a cavity between the beam / column and the double-ply plate. In a corrosive environment, this cavity can affect the strength of the beam-column connection, reduce the corrosion resistance of the steel, shorten the maintenance cycle, and cause rust to seep in, affecting the aesthetics.

[0035] The anti-corrosion method for the double-ply joint of beam and column utilizes the special weather resistance of single-component structural assembly silicone sealant. While ensuring the filling density, it can also significantly improve the special anti-corrosion requirements of the double-ply joint gap 4.

[0036] The anti-corrosion method for the double-ply connection of beams and columns uses a single-component structural assembly silicone sealant for anti-corrosion sealing. The material itself does not reduce the strength of the steel, while isolating it from the influence of the external corrosive environment, improving the weather resistance of the material, and enhancing the steel's resistance to thickness erosion in corrosive environments. This is of great significance for the safety and use of building structures.

[0037] In the installation and corrosion protection of steel structures in corrosive environments, the use of ordinary double-ply plate connections can lead to environmental corrosion effects within the double-ply plate cavities, impacting the steel's long-term corrosion resistance. The use of double-ply plate connections for beams and columns plays a crucial role in eliminating environmental corrosion within these cavities, thus contributing to a longer service life for the building structure.

[0038] The double-ply plate connection method for beams and columns not only meets the corrosion protection requirements of steel but also improves the overall weather resistance of the beam-column connection joint, extends the service life of the structure, and significantly reduces the later maintenance costs associated with corrosion resistance. It can be widely used in special environments such as corrosion, high temperature, low temperature, UV protection, and waterproofing in the steel, petroleum, chemical, and pharmaceutical industries.

[0039] With the continuous development and progress of science and technology, the technology for corrosion protection of double-ply beam-column connections is also constantly improving. Currently, domestic manufacturers of corrosion protection solutions for double-ply beam-column connections have developed a series of new products, such as single-component structural assembly silicone sealant, neutral transparent silicone structural sealant, and high-performance silicone structural adhesive, to meet the specific needs of different fields for the corrosive environment of steel structures.

[0040] Currently, the market demand for anti-corrosion solutions for double-ply beam-column connections is mainly concentrated in coastal areas and large and medium-sized cities, while inland areas and smaller cities are still largely undeveloped. With the acceleration of industrialization in these regions, environmental pressures will increase, creating significant potential demand for anti-corrosion solutions for double-ply beam-column connections.

[0041] The anti-corrosion method for the double-ply connection of beams and columns uses a single-component structural assembly silicone sealant for anti-corrosion sealing. The material itself does not reduce the strength of the steel, while isolating the influence of the external corrosive environment, improving the weather resistance of the material, and enhancing the thickness corrosion resistance of the steel in the corrosive environment.

[0042] The anti-corrosion method for the double-ply connection of beams and columns uses a single-component structural silicone sealant to seal the cavity of the double-ply, giving the cavity good durability. The sealed cavity environment can isolate the external corrosive environment. By improving the sealing of the cavity, the anti-corrosion effect of steel can be achieved, which can reduce the later maintenance cost of ordinary steel structure paint and improve the efficiency of use.

[0043] The anti-corrosion design for the beam-column double-ply joint utilizes a neutral-curing, single-component structural silicone sealant for corrosion sealing. This type of structural sealant features excellent weather resistance and reliable durability. It also has non-sagging properties, making it suitable for sealing the cavities in the beam-column double-ply joint.

[0044] The specific operating procedure is as follows:

[0045] S1. Construction of Concrete Column 1 and Installation of Embedded Steel Plate 2: On the concrete column 1 with the reinforcing bars tied and the formwork erected, determine the position of the embedded steel plate 2, and use reinforcing bars to fix the embedded steel plate 2 to the reinforcing bar cage, ensuring its accurate and secure position. The surface of the embedded steel plate 2 should be kept flat and tightly fitted to the formwork of the concrete column 1 to prevent displacement during concrete pouring. During concrete pouring, care should be taken to avoid impact and displacement of the embedded steel plate 2. After the concrete column 1 reaches a certain strength, remove the formwork and inspect the embedded steel plate 2. Check whether the position, flatness, and elevation of the embedded steel plate 2 meet the design requirements; any deviations should be addressed promptly. Clean the surface of the embedded steel plate 2 of concrete residue and rust to ensure its cleanliness.

[0046] S2. Connection of Steel Beam 10: Two pre-fabricated steel connecting plates are used. One plate is pre-welded to the embedded steel plate 2. After the steel beam 10 is in place, the second steel plate is positioned opposite the first steel plate and secured with bolts 71. The second steel plate is then welded to the embedded steel plate 2. During welding, the weld quality must meet requirements. Bolts 71 should be tightened, nuts 72 should be tightened, and anti-loosening measures should be taken.

[0047] S3. Surface Cleaning: Before applying sealant 6, the surface needs to be cleaned (e.g., dried, cleaned, and frost-free). Remove all grease, dust, moisture, surface dirt, old sealant 6, and other impurities and contaminants remaining at joints and recesses. Solvents should be wiped with a clean, lint-free white cloth. Do not use detergents or soap and water. The substrate surface should be thoroughly cleaned, dried, and smoothed, with any residual impurities completely removed. Ensure the application surface is clean, dry, and free of oil, dust, loose material, and other contaminants. Appropriate cleaning agents can be used, followed by wiping with a clean, dry cloth until the surface is completely dry.

[0048] After the above measures are completed, the cavity can be sealed according to the sealant application instructions.

[0049] S4. Gasket Material: Use a gasket (such as closed-cell polyethylene or open-cell polyethylene foam) or similar material (such as low-tack polyethylene tape with shallow bonding) at the bottom of the joint to control the depth of sealant 6. This prevents three-sided adhesion by preventing sealant 6 from adhering to the bottom of the joint.

[0050] S5. Masking and Finishing: Using masking tape ensures a clean and neat appearance around the interface, preventing excess sealant 6 from contaminating the substrate surface. Immediately after applying sealant 6, finish the interface surface to make it smooth and flat, ensuring that sealant 6 is fully adhered to the edges of the interface.

[0051] The finishing should be completed before the sealant 6 forms a skin (if during working hours). It is recommended to use a convex tool to level the surface so that the joint is filled with sealant 6. Finishing is necessary when sealing horizontal joints to prevent any liquids (such as rainwater or cleaning agents) from remaining on the sealant 6.

[0052] Do not use soap or water as finishing aids. Remove the masking tape after finishing and before the sealant forms a skin.

[0053] Do not touch the surface of sealant 6 within 48 hours after surface curing. Avoid contact with cleaning agents or solvents (such as bleach) during the curing process. Uncured sealant 6 can be cleaned and trimmed with solvents such as xylene, toluene, or methyl ethyl ketone, or with (or) organic pine oil. Appropriate precautions should be taken when using flammable solvents. Cured sealant 6 is insoluble and cannot be used for trimming blades. Sealant 6 releases gas during curing; the odor disappears after curing, and fully cured sealant 6 is harmless.

[0054] S6. Applying the sealant: Using a sharp tool, such as a utility knife, carefully cut the opening of the sealant tube at a 45° angle. The size of the opening can be determined according to the construction needs and the width of the joint. Screw the opening onto the tube and place it in the caulking gun, which can be pneumatic or manual. Holding the caulking gun at approximately a 45° angle to the surface, squeeze out the sealant at a uniform speed, filling the joint with the sealant. Ensure continuous and even application, avoiding air bubbles or gaps. Apply the sealant to the bottom of the joint to completely fill and adhere both sides. Do not simply place the sealant strip on the surface, as it will not fill the joint under its own weight. Use a scraper or your fingers to smooth the sealant, ensuring full contact with the surface to form a smooth and aesthetically pleasing seal. Remove any excess sealant from the surface before it cures. For deeper gaps, multiple filling and smoothing processes may be necessary.

[0055] S7. Curing: Sealant 6 usually needs to cure under certain temperature and humidity conditions (generally, it takes about 7 to 14 days to cure under conditions of 50% humidity and 25°C).

[0056] Before the sealant 6 cures, remove any excess sealant 6 from the surface. During the curing period, avoid disturbing the sealant 6 with other construction work in the surrounding area.

[0057] S8. Inspection: After curing, inspect the adhesion, sealing effect, and appearance quality of sealant 6. If any defects are found, repair or reapply it promptly.

[0058] The implementation principle of this utility model is as follows: This utility model discloses a double-clamped anti-corrosion structure for beam-column connections in corrosive coastal environments. By filling the cavity between the two clamping plates 3 and the steel beam 10 and the embedded steel plate 2 with epoxy primer 5 and high-temperature resistant single-component silicone sealant, it solves the technical problems of high-temperature welding damaging the anti-corrosion layer and cavity corrosion leading to rust seepage in coastal environments. This structure extends the maintenance cycle by more than 3 times, significantly reduces the total life-cycle cost, and is suitable for corrosive environments such as ports and chemical plants.

[0059] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A double-ply plate connection anti-corrosion structure for beams and columns in corrosive coastal environments, characterized in that, The structure includes a pre-embedded steel plate (2) embedded in a concrete column (1), a steel beam (10) connected to the pre-embedded steel plate (2) by two clamps (3), the two clamps (3) being detachably fixed to both sides of the steel beam (10), the same side of the two clamps (3) being fixedly connected to the pre-embedded steel plate (2), a gap (4) being provided between one side of the steel beam (10) and the pre-embedded steel plate (2), the two clamps (3) being located on the upper and lower sides of the gap (4) respectively and forming openings at both ends of the gap (4), the gap (4) being used to fill epoxy primer (5) and sealant (6).

2. The anti-corrosion structure for beam-column double-clamp connection in a coastal corrosive environment according to claim 1, characterized in that, The epoxy primer (5) fills the middle part of the gap (4), and the sealant (6) fills the openings on the upper and lower sides of the gap (4).

3. The anti-corrosion structure for beam-column double-clamp connection in a coastal corrosive environment according to claim 1, characterized in that, The sealant (6) is a single-component structural assembly silicone sealant.

4. The anti-corrosion structure for beam-column double-clamp connection in a coastal corrosive environment according to claim 1, characterized in that, The two clamps (3) are connected to both sides of the steel beam (10) by a number of fasteners (7).

5. A double-ply plate connection anti-corrosion structure for beams and columns in a corrosive coastal environment according to claim 4, characterized in that, The fastener (7) includes a bolt (71) and a nut (72). One end of the bolt (71) passes through the first clamping plate (3), the steel beam (10) and the other clamping plate (3) in sequence and is then threadedly connected to the nut (72).

6. The anti-corrosion structure for beam-column double-clamp connection in a coastal corrosive environment according to claim 1, characterized in that, The two clamping plates (3) are welded to the embedded steel plate (2) on the same side.

7. A double-ply plate connection anti-corrosion structure for beams and columns in a corrosive coastal environment according to claim 6, characterized in that, One of the clamping plates (3) is welded to the embedded steel plate (2) using a double-sided fillet weld (8), and the other clamping plate (3) is welded to the other using a single-sided weld (9).

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