A tank bottom foundation anti-corrosion container structure and construction method

Abstract

The application discloses a tank bottom foundation anti-corrosion container structure and a construction method. A plurality of protection modules are arranged at the outer edges of tank walls and concrete slabs, and are connected end to end to form a tank outer protection structure. First, second and third sealing units are arranged at the joint positions of adjacent protection modules, the joint positions of the protection modules and the tank walls, and the joint positions of the protection modules and the concrete slabs, so as to form a closed space between the tank outer protection structure and the tank bottom, to form a vacuum environment in the closed space, so that the tank bottom edge plate position in the closed space is completely isolated from the outside world, the channel of rainwater, dew and other corrosive media invading the edge plate is cut off, and the purpose of protecting the tank bottom plate is achieved.

Description

Technical Field

[0001] This application belongs to the field of storage tank corrosion protection, and in particular relates to a tank bottom foundation corrosion protection container structure and construction method. Background Technology

[0002] The edge plates of large storage tank bottoms account for a large proportion of oil tank corrosion accidents. Therefore, strengthening the protection of the edge plates of oil tank bottoms is crucial to improving the service life of oil tanks and reducing the accident rate. Currently, the common anti-corrosion method for storage tank edge plates in China is to coat them with CTPU elastic polyurethane. Its characteristics are good waterproof effect, good adhesion, good physical properties, easy maintenance, and long service life. The construction process involves adding a certain amount of filler to the waterproof coating CTPU to form a putty or adhesive, and then covering it with fiberglass cloth to strengthen the coating. This process cuts off the channels for rainwater, dew, and other corrosive media to invade the edge plates, thereby protecting the storage tank bottom.

[0003] CTPU construction requires substrate preparation, including manually removing loose paint, rust, cement, and other debris from the outer bottom of the tank base and walls, and removing corroded and loose old adhesive, iron, rust, cement, and other debris from the edge plate (steel plate) base. This process is tedious. Currently, some older oil tanks in China have undergone waterproofing treatment such as asphalt grouting (between the edge plate and the base). Substrate preparation for these tanks is even more difficult and time-consuming, with high manual cleaning costs. If oil stains, dust, and other debris on the old asphalt are not thoroughly cleaned, it will affect the tight bond between the CTPU and the edge plate. Furthermore, some areas at the bottom of the tank may have irregularities. Shaped structures such as protruding corners and bolts prevent the formation of a continuous and complete anti-corrosion layer, affecting the waterproofing effect. On the other hand, the waterproof coating needs to be applied evenly. If the waterproof layer is too thin, its strength is insufficient and it is easily damaged. It also cannot withstand a certain amount of displacement, which can easily lead to local leakage after a period of time, failing to guarantee the service life of the waterproof coating. If the waterproof coating is too thick, it will cause unevenness. After drying, uneven areas will peel and crack, and may even accelerate leakage. Once the CTPU coating is damaged in a certain area, it needs to be reapplied over a large area, which is time-consuming, labor-intensive, and costly. Therefore, it is clear that the existing technology needs further improvement. Summary of the Invention

[0004] The present invention provides a corrosion-resistant container structure for tank bottom foundation, which at least solves or alleviates one or more technical problems in the prior art, or at least provides a beneficial alternative.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A corrosion-resistant container structure for tank bottom foundation, comprising:

[0007] The tank bottom foundation structure includes a concrete platform, on which the tank body is placed;

[0008] The external protective structure of the tank consists of several protective modules connected sequentially around the outer edges of the tank wall and the concrete foundation. A first sealing unit is set at the joint between adjacent protective modules, a second sealing unit is set at the joint between the protective module and the tank wall, and a third sealing unit is set at the joint between the protective module and the concrete foundation. The edge plate at the bottom of the tank is enclosed in the closed space formed by the external protective structure and the tank body, so that the closed space forms a vacuum to achieve corrosion protection of the tank bottom.

[0009] The anti-corrosion container structure for tank bottom foundation, as exemplified in this invention, consists of several protective modules spliced ​​together at the outer edges of the tank wall and concrete foundation to form an external protective structure. Adjacent protective modules, the joints between protective modules and the tank wall, and the joints between protective modules and the concrete foundation are sealed using a first sealing unit, a second sealing unit, and a third sealing unit, respectively. This creates a closed space between the external protective structure and the tank bottom, forming a vacuum environment. This completely isolates the tank bottom edge plate from the outside environment, cutting off the channels for corrosive media such as rainwater and dew to penetrate the edge plate, thus protecting the tank bottom plate. This method is particularly suitable for old oil tanks that have failed with anti-corrosion methods such as asphalt grouting, are difficult to clean, or have irregular bottom structures that prevent the formation of a continuous and complete waterproof and anti-corrosion layer. It eliminates the need for tedious cleaning of the tank bottom, making construction convenient and installation simple. If a protective module is damaged, only the damaged module can be replaced before sealing, significantly reducing costs.

[0010] Preferably, the protective module is a protective plate, which includes a vertical section and an inclined section. One end of the vertical section along its length is provided with a insertion groove, and the other end is provided with an insertion protrusion. The insertion protrusion is vertically inserted into the insertion groove so that adjacent protective plates can be connected.

[0011] The anti-corrosion container structure for tank bottom foundation exemplified in this embodiment of the invention uses a protective plate as the protective module. By dividing the protective plate into vertical and inclined sections, the vertical section can fit against the tank wall, while the inclined section directly overlaps the concrete foundation and can directly contact the ground, allowing rainwater to flow directly along the inclined section to the ground without accumulating. The vertical section has an insertion groove along its length and an insertion protrusion at the other end. During installation, the insertion protrusion is vertically inserted into the insertion groove, thereby connecting adjacent protective plates into a whole, making installation faster and more convenient.

[0012] Preferably, the insertion protrusion has a hollow portion, the inclined section has a connecting groove, adjacent connecting grooves form a connecting channel, and the connecting channel connects the hollow portion.

[0013] The anti-corrosion container structure for the tank bottom foundation exemplified in this embodiment of the invention, by setting a hollow part in the insertion protrusion and a connecting groove in the inclined section, allows the first sealing unit to enter the hollow part and then the connecting channel, filling both the hollow part and the connecting channel, thereby completely sealing the joint of the inclined section and achieving rapid sealing operation. The gap between the insertion protrusion and the insertion groove is also filled with the first sealing unit, making adjacent first sealing units a seamless whole structure.

[0014] Preferably, the hollow portion has a connecting hole that connects the gap between the insertion groove and the insertion protrusion, and the first sealing unit enters the connecting channel and the connecting hole through the hollow portion.

[0015] The anti-corrosion container structure for the tank bottom foundation of this invention, by opening a connecting hole in the hollow part to connect the gap between the insertion groove and the insertion protrusion, when injecting the first sealing unit into the hollow part and the connecting channel connected thereto, the first sealing unit can enter the gap through the connecting hole, and the joint of adjacent protective plates can be sealed in one injection, so as to form a seamless integrated structure, simplifying the sealing operation.

[0016] Preferably, the first sealing unit includes silicone sealant, which is applied into the hollow portion by a glue gun to fill the communicating channel and the gap between the insertion groove and the insertion protrusion, so as to seal the seam between adjacent protective plates.

[0017] The corrosion-resistant container structure for the tank bottom foundation exemplified in this invention utilizes silicone sealant, a common sealing material widely used in construction, automotive, electronics, aerospace, and other fields. Silicone sealant exhibits excellent resistance to oxidation, ultraviolet radiation, acids, alkalis, and other environmental erosion, and is highly resistant to common chemical substances such as water, ethanol, and chlorides. It is also resistant to aging and embrittlement with long-term use. Therefore, silicone sealant is ideally suited for use in outdoor factory environments where oil tanks are located. Furthermore, silicone sealant possesses excellent sealing properties, capable of filling various gaps and holes to achieve waterproofing, dustproofing, and gas leakage prevention. It also provides sound absorption, heat insulation, and vibration damping. Silicone sealant can be applied manually or mechanically, requiring no special tools or skills. The operation is simple; workers can complete the sealing application using a caulking gun. During maintenance, silicone sealant is also very easy to clean and repair. Its good elasticity, once fully cured, forms a highly elastic adhesive layer that mitigates external impacts and pressure.

[0018] Preferably, the second sealing unit includes CTPU, which is cast at the joint between the tank wall and the protective module to form a slope from the tank wall downwards.

[0019] The anti-corrosion container structure of the tank bottom foundation in the embodiment of the present invention is cleaner than the outer area of ​​the bottom of the tank wall at the joint between the tank wall and the protective module. There is no cement or other debris, and no irregular structure, which facilitates quick cleaning. Therefore, it is possible to choose to coat it with existing CTPU coating, and use its excellent properties for sealing, corrosion protection and waterproofing. The amount of coating is much less than that applied to the bottom of the tank wall, which reduces costs. The CTPU forms a slope, which facilitates rainwater to flow from the slope to the protective module and then to the ground. The structural design is more reasonable.

[0020] Preferably, the third sealing unit includes polyurethane foam, the protective module is provided with a surrounding plate, and after several protective modules are connected end to end, the surrounding plate abuts against the outside of the concrete foundation to form a sealing area, and the polyurethane foam fills the sealing area to seal the joint between the protective module and the concrete foundation.

[0021] The corrosion-resistant container structure for the tank bottom foundation exemplified in this invention utilizes polyurethane foam, which possesses numerous functions such as heat insulation, waterproofing, sound insulation, and vibration absorption. It exhibits stable chemical properties, a long service life, and good fire safety performance.

[0022] With its superior self-adhesive properties and ideal water impermeability, the spray application method achieves a continuous, seamless waterproof and thermal insulation layer, forming a seamless roof and an integrated external wall insulation shell. It boasts excellent waterproof and seepage-resistant performance and good expansion properties. When sprayed onto the triangular sealing area formed by the perimeter panel, the outer side of the concrete foundation, and the protective module, the polyurethane foam expands, thereby sealing and filling the gaps.

[0023] Preferably, the enclosed space is provided with an air extraction port, and a vacuum pump evacuates the enclosed space through the air extraction port.

[0024] The anti-corrosion container structure for the tank bottom foundation exemplified in this embodiment of the invention has an air extraction port located on any of the protective modules. After the sealing and splicing is completed, this air extraction port becomes the only outlet of the enclosed space. By connecting the air extraction port of the enclosed space to a vacuum pump, the internal air is extracted, creating a vacuum environment in the enclosed space and completely isolating it from the outside world, thereby achieving anti-corrosion of the tank bottom foundation.

[0025] Preferably, the protective module is provided with an observation port, which is sealed with vacuum glass to facilitate observation of the corrosion at the bottom of the tank.

[0026] The corrosion-resistant container structure for the tank bottom foundation exemplified in this embodiment of the invention features an observation port on the protective module. This observation port is sealed with vacuum glass, allowing personnel to observe the corrosion condition at the bottom of the tank and perform maintenance based on the observed conditions.

[0027] The preferred method of using the tank bottom foundation anti-corrosion container structure includes the following steps:

[0028] S1: Clean the surface of the concrete foundation, repair the concrete foundation with concrete, smooth it, and round the edges and corners. After the concrete has cured, spray the concrete curing agent.

[0029] S2: Connect the protective modules sequentially around the outer edge of the tank wall and the concrete foundation to form a ring-shaped external protective structure for the tank.

[0030] S3: Apply silicone sealant to the hollow part of the protective module using a glue gun, filling the connecting channels, the gaps between the insertion grooves and protrusions, and the hollow part with silicone sealant, and wait for the silicone sealant to fully cure.

[0031] S4: Open the protective module section of the sealing area, inject polyurethane foam into the hole, pour and apply CTPU waterproof and anti-corrosion primer at the joint between the tank wall and the protective plate to form a slope from the tank wall downwards, ensuring that the slope angle is above 10°, and ensure that the joint is filled, flat and compacted. After the CTPU waterproof and anti-corrosion primer is no longer sticky, apply CTPU waterproof coating putty, then lay two layers of reinforcing glass cloth. After the surface dries, repeat the operation of applying CTPU waterproof coating putty and laying glass cloth once, and finally apply elastic topcoat.

[0032] S5: After the airtightness test, a vacuum pump is connected to the air extraction port to extract the air from the enclosed space to form a vacuum. Then the air extraction port is closed to achieve corrosion protection of the tank bottom.

[0033] The construction method exemplified in this embodiment of the invention has simple construction steps, requires no large-scale, time-consuming and labor-intensive pre-construction cleaning, has a short construction cycle, low cost, high anti-corrosion and waterproof effect, long service life, low maintenance cost, and is easy to install. It can be applied to the installation of new tanks and old tanks.

[0034] The above structure has the following beneficial effects:

[0035] 1. The anti-corrosion container structure of the present invention comprises protective modules spliced ​​around the outer edge of the tank wall and the concrete foundation to form an external protective structure. Through the sealing of the first sealing unit, the second sealing unit, and the third sealing unit, a closed space is formed between the protective modules, the concrete foundation, and the tank wall. The closed space is evacuated to completely isolate the bottom edge plate of the tank from the outside world, cutting off the channels for corrosive media such as rainwater and dew to invade the edge plate, thereby achieving the purpose of protecting the bottom plate of the oil tank. It is especially suitable for old oil tanks that have failed to use anti-corrosion methods such as asphalt grouting, resulting in difficult cleaning, or oil tanks with irregular bottom structures that cannot form a continuous and complete waterproof and anti-corrosion layer. It is convenient to construct, simple to install, and has a short construction period, and can achieve good anti-corrosion effect.

[0036] 2. The corrosion-resistant container structure of the present invention has an observation port with sealed vacuum glass in the corrosion-resistant module. Workers can observe the corrosion at the bottom of the tank through the observation port and carry out maintenance based on the observation. Compared with coating the anti-corrosion and waterproof layer, it is impossible to observe the internal corrosion and thus impossible to carry out timely maintenance, which greatly improves safety. Moreover, if a protective module is damaged, only the damaged protective module can be replaced and then sealed, which can greatly reduce costs.

[0037] 3. In the anti-corrosion container structure of the present invention, both the first sealing unit and the third sealing unit are injected into the space enclosed by the protective module structure, which is convenient to operate and has a good sealing effect. The process is simple, the construction cycle is short, the installation efficiency is improved, and the construction cost is reduced. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain this application and do not constitute an undue limitation of the invention. In the drawings:

[0039] Figure 1 A schematic three-dimensional structural diagram illustrating one embodiment of the tank external protective structure of this application is shown;

[0040] Figure 2 A three-dimensional structural schematic diagram illustrating one embodiment of the protective plate assembly of this application is shown.

[0041] Figure 3 This application is illustrated. Figure 2 An enlarged structural schematic diagram of one embodiment of part A in the diagram;

[0042] Figure 4 A three-dimensional structural schematic diagram of one embodiment of the protection module of this application is shown;

[0043] Figure 5 A schematic cross-sectional view of one embodiment of the external protective structure of the tank in this application is shown.

[0044] Figure 6 This application is illustrated. Figure 5 An enlarged structural schematic diagram of one embodiment of Part B;

[0045] Label Explanation:

[0046] 1-Tank body; 10-Edge plate; 2-Tank bottom foundation structure; 20-Concrete foundation; 21-Water tank; 3-External protective structure of tank; 31-Protective module; 310-Vertical section; 3100-Insertion groove; 3101-Insertion protrusion; 31010-Hollow part; 31011-Connecting hole; 311-Inclined section; 3110-Connecting groove; 32-Enclosure plate; 33-Observation port; 34-Exhaust port; 36-Injection port; 4-First sealing unit; 5-Second sealing unit; 6-Third sealing unit. Detailed Implementation

[0047] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0048] First, the technical concept of the technical solution disclosed in this invention will be explained.

[0049] The bottom edge plate of a storage tank mainly refers to the part where the tank base connects to the concrete foundation. The tank bottom is made of carbon steel, while the foundation is made of concrete; these materials have different coefficients of expansion. With changes in external temperature, significant expansion and contraction frequently occur, resulting in horizontal displacement. When the tank is fully loaded or empty, the tank body deforms under the pressure of the liquid column, and the edge plate deforms accordingly. Simultaneously, the foundation of coastal tank farms is located in soft soil layers prone to settlement. Harsh environmental conditions such as falling ice in frigid winters and the infiltration of high-salt chemical media can cause the anti-corrosion layer of the tank edge plate to peel, detach, flak, and fail. Since the tank edge plate and the bottom plate of the oil storage tank are an integral unit connected to the oil pipeline foundation, the seal between them is crucial. Otherwise, rainwater can enter through the gap between the edge plate and the foundation, causing electrochemical corrosion on the outer surface of the oil storage tank bottom plate and accelerating its perforation. Therefore, the protection of the tank edge plate is an important part of tank protection.

[0050] Given that the edge plates of large storage tanks are constantly exposed to sunlight and rain, the anti-corrosion materials used must possess waterproof and UV-resistant properties. Furthermore, considering the deformation of the tanks due to load and temperature changes, the materials must be elastic, tough, and highly malleable. To prevent damage to the anti-corrosion layer from daily maintenance and falling ice in winter, the anti-corrosion materials must also be resistant to mechanical impact. Currently, common anti-corrosion methods for storage tank edge plates in China include coating with CTPU elastic polyurethane, waterproof coatings, and wrapping with waterproof tape or petrolatum tape.

[0051] However, taking CTPU coating process as an example, as mentioned in the background, base treatment is required before CTPU construction. This includes manually removing loose paint film, loose rust, cement and other debris from the bottom outer side of the tank base. The operation is cumbersome. Especially for existing domestic oil tanks that have undergone waterproofing treatments such as asphalt grouting, the edge plates have already deformed and rusted to a certain extent. There is also asphalt material in the gap between the edge plates and the base. Therefore, it greatly hinders the re-corrosion work of the bottom plate of such oil tanks. Cleaning is time-consuming and labor-intensive, and the effect after CTPU coating is not significant.

[0052] On the other hand, some locations at the bottom of existing oil pipes have irregular structures, such as protruding corners, reinforcing ribs at the bottom of tanks, bolts, or underground pipelines, which prevent the formation of a continuous and complete anti-corrosion layer when CTPU or grease is applied, affecting the anti-corrosion effect. Furthermore, the application of anti-corrosion coatings requires ensuring uniform coating thickness, which necessitates experienced personnel for construction, resulting in high construction costs.

[0053] Meanwhile, when the CTPU coating is damaged locally, such as by a strong impact causing failure, it requires large-area recoating and repeated cleaning, resulting in high maintenance costs. Furthermore, methods such as covering with CTPU or petrolatum strips cannot reveal the corrosion status of the tank edge plate, which may indicate construction process issues. This could lead to a situation where the edge plate is corroded while the outer CTPU layer remains intact, posing a certain safety hazard.

[0054] In view of the aforementioned problems, the present invention provides a corrosion-resistant container structure for the tank bottom foundation. The invention will now be described in conjunction with the accompanying drawings.

[0055] The specific solution adopted is as follows:

[0056] like Figure 1-6 As shown, the present invention provides a corrosion-resistant container structure for tank bottom foundation, comprising:

[0057] Tank bottom foundation structure 2, which includes a concrete foundation 20, with the tank body 1 placed on the concrete foundation 20.

[0058] The external protective structure 3 is composed of several protective modules 31 connected sequentially around the outer edge of the tank wall and the concrete foundation 20. A first sealing unit 4 is set at the joint between adjacent protective modules 31, a second sealing unit 5 is set at the joint between the protective module 31 and the tank wall, and a third sealing unit 6 is set at the joint between the protective module 31 and the concrete foundation 20. The edge plate 10 at the bottom of the tank body 1 is enclosed in the closed space formed by the external protective structure 3 and the tank body 1, so that the closed space forms a vacuum to achieve corrosion protection of the tank bottom.

[0059] The anti-corrosion container structure for the tank bottom foundation exemplified in this embodiment of the invention uses several protective modules 31 spliced ​​end-to-end along the outer edges of the tank wall and the concrete foundation 20 to form an external protective structure 3. The joints between adjacent protective modules 31, between the protective module 31 and the tank wall, and between the protective module 31 and the concrete foundation 20 are sealed by a first sealing unit 4, a second sealing unit 5, and a third sealing unit 6, respectively. This creates a closed space between the external protective structure 3 and the bottom of the tank body 1, forming a vacuum environment, thereby protecting the bottom of the tank body 1 within this space. The edge plate 10 completely isolates the outside world, cutting off the channels for corrosive media such as rainwater and dew to invade the edge plate 10, thereby protecting the bottom plate of the oil tank. It is especially suitable for old oil tanks that have failed to use anti-corrosion methods such as asphalt grouting, which are difficult to clean, or oil tanks with irregular bottom structures that cannot form a continuous and complete waterproof and anti-corrosion layer. There is no need to carry out tedious cleaning of the bottom of the tank wall, which is convenient for construction and simple for installation. If a certain protective module 31 is damaged, only the damaged protective module 31 can be replaced, and then the sealing can be performed, which can greatly reduce costs.

[0060] In a preferred embodiment of this application, the enclosed space is provided with an extraction port 34, through which a vacuum pump evacuates the enclosed space. The extraction port 34 can be set on any of the protective modules 31. After the protective modules 31 are assembled and all joints are sealed, the extraction port 34 becomes the only inlet and outlet of the enclosed space. By connecting the vacuum pump to the extraction port 34 of the enclosed space, the internal air is extracted, creating a vacuum environment in the enclosed space and completely isolating it from the outside world, thereby achieving corrosion protection of the tank bottom foundation. In addition, extraction ports 34 can be set on any two protective modules 31, one as an air inlet and the other as an air outlet. After the enclosed space is sealed, the airtightness can be tested through the air inlet and outlet to confirm the airtightness of the enclosed space, and then a vacuum is evacuated. Specifically, an existing airtightness testing instrument can be connected to the outlet, and an air blowing device can be connected to the inlet to blow gas into the enclosed space. The airtightness testing instrument measures the pressure difference within the enclosed space, as those skilled in the art will understand.

[0061] The specific implementation of the protection module 31 is as follows: Figure 4As shown, the protective module 31 is a protective plate, which includes a vertical section 310 and an inclined section 311. One end of the vertical section 310 along its length is provided with an insertion groove 3100, and the other end is provided with an insertion protrusion 3101. The insertion protrusion 3101 vertically inserts into the insertion groove 3100, allowing adjacent protective plates to connect. The protective plate can be made of polyethylene. Polyethylene is lightweight, has uniform thickness, a smooth and flat surface, good cold resistance, high mechanical strength, electrical insulation, resistance to acid and alkali corrosion, resistance to dissolution, pressure resistance, anti-slip and wear resistance, and anti-stick and self-lubricating properties. Dividing the protective plate into the vertical section 310 and the inclined section 311, it can be manufactured in one piece. The vertical section 310 can... The inclined section 311, fitting snugly against the tank wall, directly overlaps the concrete foundation 20 or can directly contact the ground. A water trough 21 is installed on the ground, allowing rainwater to flow directly along the inclined section 311 to the trough 21. The vertical section 310 has an insertion groove 3100 along its length and an insertion protrusion 3101 at the other end. During installation, the insertion protrusion 3101 is vertically inserted into the insertion groove 3100, thus connecting adjacent protective plates into a whole, forming a ring-shaped protective structure adapted to the diameter of the tank body. Installation is quick and convenient. Furthermore, the inclined section 311 can also have a certain curvature to provide better bending resistance and deformation resistance. The inclined section 311 can also be divided into two sections, one of which... Figure 4 The inclination is consistent, and secondly, it is close to the outside of the concrete foundation 20 but not attached to the concrete foundation 20, so as to reduce the footprint and make it more aesthetically pleasing.

[0062] Furthermore, to facilitate observation of the corrosion condition of the bottom edge plate 10 of the tank, such as... Figure 2 The protective module 31 is equipped with an observation port 33, which is sealed with vacuum glass to facilitate observation of the corrosion at the bottom of the tank 1.

[0063] The observation port 33 is a sealed vacuum glass with excellent thermal insulation performance. It eliminates cold and heat radiation near doors and windows, whether in severe cold or scorching heat. There is no air or water vapor molecules in the vacuum layer of the vacuum glass. It is tightly sealed and has a high thermal resistance. Condensation will not occur inside the glass in winter, making it convenient for staff to observe. The vacuum glass and the protective module 31 can be installed separately. The connection between the vacuum glass and the sealing protection module 31 is coated with sealant and a sealing strip is used. For example, butyl rubber, which has strong resistance to water vapor permeability and air permeability, is applied evenly and continuously to ensure sealing. Alternatively, it can be produced as a single unit to ensure sealing. Workers can check the corrosion at the bottom of the tank through the observation port 33 and carry out maintenance based on the observation. If corrosion occurs, it may indicate vacuum failure or leakage at the bottom of the tank. A preliminary judgment can be made by observing the appearance of the protection module 31. If there is obvious damage, a new protection module 31 is replaced and sealing is carried out. If there is no obvious damage, inert gas is blown into the closed space using an air blowing device to check for leaks. By detecting the composition of the discharged gas, the leakage of tank 1 can be determined, thereby improving the safe storage performance of the oil tank.

[0064] To achieve a seal between the seams of adjacent protective modules 31, such as Figure 2 , 3 as well as Figure 6 The insertion protrusion 3101 has a hollow portion 31010, and the inclined section 311 has a connecting groove 3110. Adjacent connecting grooves 3110 form a connecting channel. One end of the connecting channel is connected to the hollow portion 31010, and the other end is closed. The hollow portion 31010 has a connecting hole 31011 that connects the gap between the insertion groove 3100 and the insertion protrusion 3101. The first sealing unit 4 enters the connecting channel and the connecting hole 31011 through the hollow portion 31010.

[0065] Specifically, in this embodiment, the first sealing unit 4 is preferably silicone sealant. The silicone sealant is injected into the hollow part 31010 by a glue gun until it fills the connecting channel and the gap between the insertion groove 3100 and the insertion protrusion 3101, so as to seal the seam between adjacent protective plates, making the adjacent first sealing units 4 a seamless whole structure, and the sealing operation is simple and quick.

[0066] In order to achieve the gap sealing of the tank wall of the protective module 31, in this embodiment, the second sealing unit 5 is preferably CTPU. CTPU is cast at the joint connection position between the tank wall and the protective module 31 to form a slope from the tank wall downward.

[0067] Specifically, since the joint between the tank wall and the protective module 31 is cleaner than the bottom outer area of ​​the tank wall, with no cement or other debris and no irregular structures, it is easy to clean quickly. Therefore, it is possible to apply existing CTPU coating, utilizing its excellent properties for sealing, corrosion protection and waterproofing. The amount of coating is much less than that applied to the bottom of the tank wall, reducing costs. The CTPU forms a slope, which facilitates rainwater to flow from the slope to the protective module 31 and then to the ground, making the structural design more reasonable.

[0068] To seal the gap between the protective module 31 and the outer side of the concrete foundation 20, in this embodiment, the third sealing unit 6 includes polyurethane foam. The protective module 31 is provided with a surrounding plate 32. After several protective modules 31 are connected end to end, the surrounding plate 32 abuts against the outer side of the concrete foundation 20 to form a sealing area. The polyurethane foam fills the sealing area to seal the joint between the protective module 31 and the concrete foundation 20.

[0069] Specifically, the injection port 36 of the protective module 31 in the sealing area is filled with polyurethane foam. After the polyurethane foam has expanded, the gap between the protective module 31 and the outside of the concrete foundation 20 is sealed.

[0070] The method for using the anti-corrosion container structure for the tank bottom foundation includes the following steps:

[0071] S1: Clean the surface of the concrete foundation 20 of debris, repair the concrete foundation 20 with concrete, smooth it, and round the edges and corners. After the concrete has cured, spray the concrete hardener. The concrete hardener is a water-based liquid penetrant that can penetrate into the concrete surface 3-8mm and react with the free calcium in the concrete surface in a complex chemical reaction. The calcium silicate produced can seal the pores of the concrete surface, making it a dense whole.

[0072] S2: Connect the protective modules 31 sequentially around the outer edge of the tank wall and the concrete foundation 20 to form a ring-shaped tank external protective structure 3. The ring-shaped tank external protective structure 3 is designed according to the outer wall size of the tank body 1. The gap between the ring-shaped tank external protective structure 3 and the tank wall after it is fully assembled to the outside of the tank wall is optimally within the range of 0-1mm.

[0073] S3: Apply silicone sealant to the hollow part 31010 of the protective module 31 using a glue gun, so that the silicone sealant fills the connecting channel, the gap between the insertion groove 3100 and the insertion protrusion 3101 and the hollow part 31010, and wait for the silicone sealant to fully cure.

[0074] S4: The protective module 31 of the sealing area is partially opened. Polyurethane foam is injected into the opening. CTPU waterproof and anti-corrosion primer is poured and applied at the joint between the tank wall and the protective plate to form a slope from the tank wall downwards. Ensure that the slope angle is above 10° and that the joint is filled, leveled and compacted. After the CTPU waterproof and anti-corrosion primer is no longer sticky, CTPU waterproof coating putty is applied. Then two layers of reinforced glass cloth are laid. After the surface dries, the operation of applying CTPU waterproof coating putty and laying glass cloth is repeated. Finally, elastic topcoat is applied.

[0075] S5: After the air tightness test, use a vacuum pump connected to the air extraction port 34 to extract the air from the closed space to form a vacuum, and then close the air extraction port 34 to achieve corrosion protection of the tank bottom.

[0076] The construction method exemplified in this embodiment of the invention has simple construction steps, requires no large-scale, time-consuming and labor-intensive pre-construction cleaning, has a short construction cycle, low cost, high anti-corrosion and waterproof effect, long service life, low maintenance cost, and is easy to install. It is also suitable for the installation of new tanks and old tanks.

[0077] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0078] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A corrosion-resistant container structure for tank bottom foundation, characterized in that, include: The tank bottom foundation structure includes a concrete platform, on which the tank body is placed; The external protective structure of the tank consists of several protective modules connected sequentially around the outer edges of the tank wall and the concrete foundation. A first sealing unit is provided at the joint between adjacent protective modules, a second sealing unit is provided at the joint between the protective module and the tank wall, and a third sealing unit is provided at the joint between the protective module and the concrete foundation. The edge plate at the bottom of the tank is enclosed in the closed space formed by the external protective structure and the tank body, creating a vacuum in the closed space to achieve corrosion protection of the tank bottom. The protective module is equipped with an observation port, which is sealed with vacuum glass to facilitate observation of the corrosion at the bottom of the tank, and maintenance can be carried out based on the observation. During maintenance, an air blowing device is used to blow inert gas into the enclosed space to check for leaks, and the composition of the discharged gas is detected to determine the leakage of the tank, thereby improving the safe storage performance of the oil tank. The protective module is a protective plate, which includes a vertical section and an inclined section. One end of the vertical section along its length is provided with a insertion groove, and the other end is provided with an insertion protrusion. The insertion protrusion is vertically inserted into the insertion groove so that adjacent protective plates can be connected. The insertion protrusion has a hollow portion, the inclined section has a connecting groove, adjacent connecting grooves form a connecting channel, and the connecting channel connects the hollow portion; The first sealing unit includes silicone sealant, which is injected into the hollow part by a glue gun to fill the communicating channel and the gap between the insertion groove and the insertion protrusion, so as to seal the seam between adjacent protective plates. The second sealing unit includes CTPU, which is cast at the joint between the tank wall and the protective module to form a slope from the tank wall downwards. The third sealing unit includes polyurethane foam. The protective module is equipped with a surrounding plate. After several protective modules are connected end to end, the surrounding plate abuts against the outside of the concrete foundation to form a sealing area. The polyurethane foam fills the sealing area to seal the joint between the protective module and the concrete foundation.

2. The anti-corrosion container structure for tank bottom foundation according to claim 1, characterized in that, The hollow part has a connecting hole that connects the gap between the insertion groove and the insertion protrusion. The first sealing unit enters the connecting channel and the connecting hole through the hollow part.

3. The anti-corrosion container structure for tank bottom foundation according to claim 1, characterized in that, The enclosed space is equipped with an air extraction port, through which a vacuum pump evacuates the enclosed space.

4. A method of using the anti-corrosion container structure for tank bottom foundation as described in any one of claims 1 to 3, characterized in that, Includes the following steps: S1: Clean the surface of the concrete foundation, repair the concrete foundation with concrete, smooth it, and round the edges and corners. After the concrete has cured, spray the concrete curing agent. S2: Connect the protective modules sequentially around the outer edge of the tank wall and the concrete foundation to form a ring-shaped external protective structure for the tank. S3: Apply silicone sealant to the hollow part of the protective module using a glue gun, filling the connecting channels, the gaps between the insertion grooves and protrusions, and the hollow part with silicone sealant, and wait for the silicone sealant to fully cure. S4: Open the injection port of the protective module in the sealing area, inject polyurethane foam into the hole, pour and apply CTPU waterproof and anti-corrosion primer at the joint between the tank wall and the protective plate to form a slope from the tank wall downwards, ensuring that the slope angle is above 10°, and ensure that the joint is filled, flat and compacted. After the CTPU waterproof and anti-corrosion primer is no longer sticky, apply CTPU waterproof coating putty, and then lay two layers of reinforcing glass cloth. After the surface is dry, repeat the operation of applying CTPU waterproof coating putty and laying glass cloth once, and finally apply elastic topcoat. S5: Use a vacuum pump connected to the evacuation port to extract the air from the enclosed space, creating a vacuum, and then close the evacuation port to achieve corrosion protection of the tank bottom.

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