Viscoelastic body anti-corrosion structure for edge plate of storage tank

Abstract

The invention relates to the technical field of storage tank corrosion prevention, in particular to a viscoelastic body corrosion prevention structure for a storage tank marginal plate, which comprises a base and a storage tank vertically mounted on the base, the marginal plate is arranged between the outer wall of the bottom of the storage tank and the base, and the joint of the outer edge of the marginal plate and the base is filled with a viscoelastic body corrosion prevention sealant. The connecting position of the outer wall of the storage tank and the upper side of the edge plate is filled with viscoelastic body anti-corrosion paste, a viscoelastic body anti-corrosion adhesive tape is arranged on the upper side of the edge plate, the upper end of the viscoelastic body anti-corrosion adhesive tape extends to be attached to the outer wall of the storage tank, and the lower end of the viscoelastic body anti-corrosion adhesive tape extends to be attached to the upper surface of the base. The structure is simple to construct and operate, and the lap joint part passes through the special cold flow property permeable non-woven fabric of the viscoelastic body material, so that the glue layer of the lap joint part is fused, and the problem that water enters the lap joint part is thoroughly solved. The viscoelastic body anti-corrosion sealant, the viscoelastic body anti-corrosion paste and the viscoelastic body anti-corrosion adhesive tape can keep permanent flexibility and have good elasticity and ductility.

Description

Technical Field

[0001] The invention relates to the technical field of storage tank anticorrosion, and in particular to a viscoelastic anticorrosion structure for a storage tank edge plate. Background Art

[0002] Steel vertical oil storage tanks are large-scale facilities that are indispensable for the storage and transportation of oil products in the petroleum and petrochemical industries. This type of storage tank is generally composed of three main parts: the tank top, the tank body and the tank bottom plate. Among them, the tank top, the tank body and the tank bottom plate can all adopt the dual protection measures of rust-proof and weather-resistant paint + cathodic protection to solve the corrosion problem. However, the outer edge of the bottom plate is severely corroded due to the lack of effective anti-corrosion measures. According to statistics, among the corrosion of oil tanks, bottom plate corrosion accounts for 80%, and among the corrosion of the bottom plate, edge plate corrosion accounts for 60%. It can be seen that the corrosion of the edge plate is one of the main causes of oil tank failure.

[0003] At present, there are mainly the following methods for anti-corrosion of tank edge plates: Waterproof membrane: Generally, EPDM waterproof membrane is used to cover the surface of the tank edge plate. The main problem is that this type of material does not have good adhesion and sealing properties to steel, and the handling of the overlapping parts is more complicated. If you are not careful, water will seep from the overlapping parts.

[0004] Petrolatum tape: Petrolatum tape delays corrosion of the substrate by adding corrosion inhibitors, but it has no bonding adhesion. As time goes by, the oil content of the petrolatum tape will gradually disappear, resulting in anti-corrosion failure. Therefore, some existing practices cannot meet the anti-corrosion requirements of the tank edge plate. How to take effective anti-corrosion measures on the edge plate will be the difficulty and key point in determining the service life of the tank. Summary of the invention

[0005] The purpose of the present invention is to provide a viscoelastic anti-corrosion structure for a tank edge plate, so as to solve the problem that some existing practices cannot meet the anti-corrosion requirements of the tank edge plate.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A viscoelastic anti-corrosion structure for a tank edge plate comprises a base and a tank vertically mounted on the base, wherein an edge plate is arranged between the bottom outer wall of the tank and the base, a viscoelastic anti-corrosion sealant is filled at the connection between the outer edge of the edge plate and the base, a viscoelastic anti-corrosion paste is filled at the connection between the outer wall of the tank and the upper side of the edge plate, a viscoelastic anti-corrosion tape is arranged at the upper side of the edge plate, the upper end of the viscoelastic anti-corrosion tape extends to fit the outer wall of the tank, and the lower end of the anti-corrosion tape extends to fit the upper surface of the base.

[0007] A further technical solution is that the viscoelastic anti-corrosion tape is a paintable viscoelastic anti-corrosion tape, the upper side of the paintable viscoelastic anti-corrosion tape is painted with an elastomeric weather-resistant coating, and the elastomeric weather-resistant coating covers the edge of the paintable viscoelastic anti-corrosion tape.

[0008] A further technical solution is that the elastomeric weather-resistant coating is polyurethane or polyurea, and the surface of the anti-corrosion belt is provided with non-woven fabric or fiber fabric.

[0009] A further technical solution is that the lower end of the anti-corrosion belt extends to the facade of the base.

[0010] A further technical solution is that an auxiliary anti-corrosion belt is provided on the surface of the viscoelastic anti-corrosion sealant, the upper side of the auxiliary anti-corrosion belt extends to the upper side of the edge plate, and the lower side extends to the upper side of the base.

[0011] A further technical solution is that a filling groove is arranged around the storage tank in a recessed manner below the edge plate on the upper side of the base, and a sealing ring belt is arranged in the filling groove.

[0012] A further technical solution is that the sealing ring includes an elastic strip, the outer wall of the elastic strip is sealed and fitted with the bottom of the filling groove, the groove wall and the lower side of the edge plate, an adsorption cavity is arranged inside the elastic strip along its length direction, the side and bottom surfaces of the elastic strip are provided with adsorption holes connected to the adsorption cavity, the inner wall of the adsorption cavity is fitted with a tubular water-soluble film, and the inner wall of the water-soluble film is filled with micro-expansive cement.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This structure will not involve the use of primer, reducing the construction process, and the viscoelastic anti-corrosion material has good compatibility with cement, concrete and steel; 2. The construction operation of this structure is simple, and the overlapping parts penetrate the non-woven fabric through the unique cold flow of the viscoelastic material, so that the glue layer at the overlapping parts is fused, and the problem of water entering the overlapping parts is completely solved; 3. The viscoelastic anti-corrosion sealant, viscoelastic anti-corrosion paste and viscoelastic anti-corrosion tape used can maintain permanent flexibility, all have good elasticity and ductility, and will not damage the anti-corrosion layer structure due to deformation of the edge plate caused by thermal expansion and contraction of the storage tank or load changes, and have long-term repairability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The schematic diagram of the mechanism of a viscoelastic anti-corrosion structure for a tank edge plate of the present invention.

[0015] Figure 2 for Figure 1 A partial enlarged schematic diagram of the area marked A in the middle.

[0016] Figure 3 The present invention is a schematic diagram of splicing a paintable viscoelastic anti-corrosion tape of a viscoelastic anti-corrosion structure used for a tank edge plate.

[0017] Icons: 1-base, 2-storage tank, 3-edge plate, 4-viscoelastic anti-corrosion sealant, 5-viscoelastic anti-corrosion paste, 6-paintable viscoelastic anti-corrosion tape, 7-elastomeric weather-resistant coating, 8-auxiliary anti-corrosion tape, 9-filling groove, 10-elastic strip, 11-adsorption hole, 12-water-soluble membrane, 13-micro-expansive cement. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] Figures 1 to 3 An embodiment of the present invention is shown.

[0020] Embodiment 1: A viscoelastic anticorrosion structure for the edge plate of a storage tank comprises a base 1 (cement base), and a storage tank 2 vertically mounted on the base 1, an edge plate 3 is arranged between the bottom outer wall of the storage tank 2 and the base 1, the connection between the outer edge of the edge plate 3 and the base 1 is filled with a viscoelastic anticorrosion sealant 4, the connection between the outer wall of the storage tank 2 and the upper side of the edge plate 3 is filled with a viscoelastic anticorrosion paste 5, and a viscoelastic anticorrosion tape is arranged on the upper side of the edge plate 3, the upper end of the viscoelastic anticorrosion tape extends to fit the outer wall of the storage tank 2, and the lower end of the anticorrosion tape extends to fit the upper surface of the base 1. This structure will not involve the use of primer, reduce construction procedures, and the viscoelastic anticorrosion material has good compatibility with cement, concrete and steel. The construction operation of this structure is simple, and the overlapping part penetrates the non-woven fabric through the unique cold flow of the viscoelastic material, so that the adhesive layer of the overlapping part is fused, which completely solves the problem of water ingress due to the overlapping part. The viscoelastic anti-corrosion sealant 4, viscoelastic anti-corrosion paste 5 and viscoelastic anti-corrosion tape used can maintain permanent flexibility, and have good elasticity and ductility. The anti-corrosion layer structure will not be damaged by deformation of the edge plate 3 caused by thermal expansion and contraction of the storage tank 2 or load changes, and have long-term repairability.

[0021] The viscoelastic anti-corrosion tape is a paintable viscoelastic anti-corrosion tape 6, the upper side of which is painted with an elastomeric weather-resistant coating 7, and the elastomeric weather-resistant coating 7 covers the edge of the paintable viscoelastic anti-corrosion tape 6. The paintable viscoelastic anti-corrosion tape 6 is used as the anti-corrosion layer, and the non-woven fabric or glass fiber fabric on the surface is well bonded with the coating, so that the entire anti-corrosion structure is integrated, further avoiding the intrusion of moisture and air. The elastomeric weather-resistant coating 7 is used as the outer anti-corrosion protective layer, which can not only play the role of weather resistance and UV resistance, but also prevent it from tearing.

[0022] The elastic weather-resistant coating 7 is polyurethane or polyurea, and the surface of the paintable viscoelastic anti-corrosion tape 6 is provided with non-woven fabric or fiber fabric.

[0023] The lower end of the paintable viscoelastic anti-corrosion tape 6 extends to the vertical surface of the base 1 .

[0024] The surface of the viscoelastic anticorrosion sealant 4 is provided with an auxiliary anticorrosion tape 8, the upper side of which extends to the upper side of the edge plate 3, and the lower side extends to the upper side of the base 1. The viscoelastic anticorrosion sealant 4 is used to fill the edge plate 3 and the base 1, and is processed into a slope shape with an angle of no more than 30°. Due to its excellent adhesion and ductility, it can deform when the edge plate 3 is deformed, and will not lose adhesion, thereby preventing water vapor from penetrating. The viscoelastic anticorrosion paste 5 has the same composition as the paintable viscoelastic anticorrosion tape 6, and is mainly used to fill the corner weld between the edge plate 3 and the vertical wall of the storage tank 2. As a smooth transition layer, the filling angle should be no more than 45° to prevent bubbles and hollows from being generated during the pasting and covering process of the paintable viscoelastic anticorrosion tape 6. The covering width of the paintable viscoelastic anticorrosion tape 6 with the vertical surface of the base 1 should be no less than 100 mm, and the covering width with the vertical wall of the storage tank 2 should not be less than 100 mm. When the width of the platform of the base 1 from the edge of the base 1 to the edge plate 3 is ≤180mm, two 200mm wide paintable viscoelastic anti-corrosion tapes 6 should be used to overlap and cover, one of which is used to paste the vertical surface and plane of the base 1, and the other is used to paste the vertical wall of the storage tank 2 and the plane of the base 1. The horizontal overlap width of the two tapes should not be less than 20mm. When the platform width of the base 1 is greater than 180mm and ≤280mm, one 200mm wide and one 300mm wide paintable viscoelastic anti-corrosion tape 6 should be used to overlap and cover, of which the 200mm wide paintable viscoelastic anti-corrosion tape 6 is used to paste the vertical wall of the storage tank 2 and the plane of the base 1, and the 300mm wide paintable viscoelastic anti-corrosion tape 6 is used to paste the vertical surface and the plane of the base 1. The horizontal overlap width of the two tapes should not be less than 20mm. When the platform width of the base 1 is greater than 280mm and less than or equal to 360mm, three pieces of paintable viscoelastic anti-corrosion tapes 6 with a width of 200mm are used to cover them in an overlapping manner, one piece is used for pasting on the vertical surface and flat surface of the base 1, one piece is used for pasting on the flat surface of the base 1, and one piece is used for pasting on the vertical wall of the tank 2 and the flat surface of the base 1. The horizontal overlap width between the paintable viscoelastic anti-corrosion tapes 6 and the paintable viscoelastic anti-corrosion tapes 6 should not be less than 20mm. When the platform width of the base 1 is greater than 360mm and less than or equal to 460mm, two pieces of paintable viscoelastic anti-corrosion tapes 6 with a width of 200mm and one piece of paintable viscoelastic anti-corrosion tapes 6 with a width of 300mm are used to cover them in an overlapping manner, wherein one piece of the paintable viscoelastic anti-corrosion tape 6 with a width of 200mm is used to paste on the vertical and flat surfaces of the base 1, and the 300mm wide paintable viscoelastic anti-corrosion tape 6 is laid flat on the flat surface of the base 1; and another piece of the paintable viscoelastic anti-corrosion tape 6 with a width of 200mm is partly pasted on the vertical wall of the storage tank 2, and partly pasted on the flat surface of the base 1.When the platform width of the base 1 is greater than 460mm and less than or equal to 540mm, two pieces of 300mm-wide and one piece of 200mm-wide paintable viscoelastic anticorrosion tape 6 are used to overlap and paste and cover. One piece of 300mm-wide paintable viscoelastic anticorrosion tape 6 is partly pasted on the vertical surface of the base 1 and partly pasted on the flat surface of the base 1; another piece of 300mm-wide paintable viscoelastic anticorrosion tape 6 is directly laid flat on the flat surface of the base 1; one part of the 200mm-wide paintable viscoelastic anticorrosion tape 6 is pasted on the vertical wall of the storage tank 2 and partly on the flat surface of the base 1. The paintable viscoelastic anticorrosion tape 6 is pasted in an overlapping manner, and the horizontal overlap width should be no less than 20mm, and the longitudinal overlap should be no less than 50mm. The paintable viscoelastic anti-corrosion tape 6 should be pasted from low to high when pasting and laying, that is, pasted in the order of base 1 vertical surface - base 1 plane - tank 2 vertical surface, so as to prevent water accumulation in the overlapping parts of the tape. The construction steps are as follows: Step 1: Perform surface treatment before anti-corrosion construction, clean the sand and gravel particles on the surface of the base 1 to ensure the surface is clean, and perform rust removal on the edge plate 3 of the storage tank 2 and the vertical wall of the storage tank 2, with the treatment level reaching St2 or above; Step 2: Use a glue injection gun to inject the viscoelastic anti-corrosion sealant 4 into the gap between the edge plate 3 and the base 1; Step 3: Fill the viscoelastic anti-corrosion paste 5 into the corner weld surface between the edge plate 3 and the vertical wall of the storage tank 2; Step 4: Paste the paintable viscoelastic anti-corrosion tape 6 from the bottom to the top and spread it on the base 1 and the steel surface. Press it tightly when pasting to ensure that the tape fits tightly to the surface of the substrate; Step 5: Apply or roll the elastomeric weather-resistant coating 7 on the surface of the paintable viscoelastic anti-corrosion tape 6, apply it twice, and apply the second coat only after the first coat of coating is dry. After the construction is completed, it can play an anti-corrosion role, and the anti-corrosion period is more than 10 years.

[0025] Embodiment 2: On the basis of Example 1, a filling groove 9 is provided on the upper side of the base 1 below the edge plate 3 and surrounds the storage tank 2, and a sealing ring is provided in the filling groove 9. By providing the filling groove 9 and the sealing ring, when the paintable viscoelastic anti-corrosion tape 6, the elastomer weather-resistant coating 7, etc. are damaged or punctured by external force, water can penetrate into the lower side of the paintable viscoelastic anti-corrosion tape 6. As the upper surface of the base 1 moves toward the edge plate 3, a water-blocking belt can be formed on the lower side of the edge plate 3 through the sealing ring, so as to prevent the infiltrated water from continuing to invade the tank bottom of the storage tank 2.

[0026] The sealing ring belt includes an elastic strip 10, the outer wall of the elastic strip 10 is sealed and fitted with the bottom and wall of the filling groove 9 and the lower side of the edge plate 3, an adsorption cavity is arranged in the elastic strip 10 along its length direction, the side and bottom of the elastic strip 10 are provided with adsorption holes 11 connected to the adsorption cavity, and the inner wall of the adsorption cavity is fitted with a tubular water-soluble film 12, and the inner wall of the water-soluble film 12 is filled with micro-expansion cement 13. With such a setting, the outer wall of the elastic strip 10 can be sealed and fitted with the bottom and wall of the filling groove 9 and the lower side of the edge plate 3 by means of the elasticity of the elastic strip 10 itself during installation. When water invades the filling groove 9, the elastic strip 10 is first used to seal and prevent water from continuing to invade. When water intrudes into the filling groove 9, it will contact the water-soluble film 12 through the adsorption holes 11. The water-soluble film 12 melts when it meets water, and water enters the inside of the water-soluble film 12 and contacts the micro-expansive cement 13. The micro-expansive cement 13 absorbs water and solidifies, and slightly expands. The micro-expansion will push the elastic strip 10 outward, so that the outer wall of the elastic strip 10 and the bottom, wall and lower side of the edge plate 3 of the filling groove 9 are more tightly fitted. In addition, due to the presence of the water-soluble film 12, the micro-expansive cement 13 can be well sealed to avoid contact with the outside world, so that when the water-soluble film 12 is intact, the shelf life of the micro-expansive cement 13 is greatly extended.

[0027] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A viscoelastic anti-corrosion structure for a tank edge plate, comprising a base (1), and a tank (2) vertically mounted on the base (1), wherein an edge plate (3) is arranged between the bottom outer wall of the tank (2) and the base (1), characterized in that: The connection between the outer edge of the edge plate (3) and the base (1) is filled with a viscoelastic anti-corrosion sealant (4), the connection between the outer wall of the storage tank (2) and the upper side of the edge plate (3) is filled with a viscoelastic anti-corrosion paste (5), and a viscoelastic anti-corrosion tape is provided on the upper side of the edge plate (3), the upper end of the viscoelastic anti-corrosion tape extends to the outer wall of the storage tank (2), and the lower end of the anti-corrosion tape extends to the upper surface of the base (1).

2. The viscoelastic anti-corrosion structure for the edge plate of a storage tank according to claim 1, characterized in that: The viscoelastic anti-corrosion tape is a paintable viscoelastic anti-corrosion tape (6), the upper side of the paintable viscoelastic anti-corrosion tape (6) is painted with an elastomeric weather-resistant coating (7), and the elastomeric weather-resistant coating (7) covers the edge of the paintable viscoelastic anti-corrosion tape (6).

3. The viscoelastic anti-corrosion structure for the edge plate of a storage tank according to claim 2, characterized in that: The elastic weather-resistant coating (7) is polyurethane or polyurea, and the surface of the paintable viscoelastic anti-corrosion tape (6) is provided with non-woven fabric or fiber fabric.

4. The viscoelastic anti-corrosion structure for the edge plate of a storage tank according to claim 2, characterized in that: The lower end of the paintable viscoelastic anti-corrosion tape (6) extends to the vertical surface of the base (1).

5. The viscoelastic anti-corrosion structure for the edge plate of a storage tank according to claim 1, characterized in that: An auxiliary anti-corrosion strip (8) is provided on the surface of the viscoelastic anti-corrosion sealant (4), wherein the upper side of the auxiliary anti-corrosion strip (8) extends to the upper side of the edge plate (3), and the lower side extends to the upper side of the base (1).

6. The viscoelastic anti-corrosion structure for the edge plate of a storage tank according to claim 1, characterized in that: A filling groove (9) is provided on the upper side of the base (1) below the edge plate (3) and surrounds the storage tank (2), and a sealing ring is provided in the filling groove (9).

7. The viscoelastic anti-corrosion structure for the edge plate of a storage tank according to claim 6, characterized in that: The sealing ring belt comprises an elastic strip (10), the outer wall of the elastic strip (10) being sealingly fitted with the bottom and wall of the filling groove (9) and the lower side of the edge plate (3), an adsorption cavity being arranged inside the elastic strip (10) along its length direction, the side and bottom surfaces of the elastic strip (10) being both provided with adsorption holes (11) communicating with the adsorption cavity, a tubular water-soluble film (12) being fitted on the inner wall of the adsorption cavity, and the inner wall of the water-soluble film (12) being filled with micro-expansive cement (13).

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