A double-layer structure for vertical storage tank interfaces and obstacles

Abstract

The present application belongs to the technical field of double-layer storage tank, and in particular relates to a double-layer structure for the boundary and obstacle of vertical storage tank. The double-layer structure comprises a bottom plate, a substrate layer arranged on the upper surface of the bottom plate, a clamping plate layer arranged on the upper surface of the substrate layer, a plurality of blind holes arranged on the clamping plate layer, and a top sealing layer arranged on the upper surface of the clamping plate layer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of double-layer storage tanks, and particularly relates to a double-layer structure for the boundary and obstacle of a vertical storage tank. BACKGROUND

[0002] Vertical storage tanks are widely used in oil and petrochemical enterprises for oil storage and in refining tank areas.

[0003] Generally, the design service life of a vertical storage tank is more than 30 years, but the thickness of the bottom plate is only about 6 mm, and the deposited water at the bottom of the storage tank is prone to electrolytic corrosion and chemical corrosion, thereby resulting in a large difference between the actual service life of the bottom plate of the storage tank and the design service life. In particular, when a corrosive medium is stored in the storage tank, the bottom plate of some storage tanks is corroded and perforated within 5 years.

[0004] The seepage and leakage caused by the corrosion of the bottom plate of the storage tank is difficult to find, and the leakage causes huge costs for the treatment of soil and groundwater pollution.

[0005] In view of the corrosion and leakage of the bottom plate of the storage tank, developed countries in Europe and the United States began to explore the use of high polymer materials for bottom plate corrosion prevention in the 1980s. Among them, the American API653 requires that when the bottom plate of the storage tank is less than 2.5 mm, the bottom plate should be replaced or a bottom plate lining should be added.

[0006] This technology mainly adds a composite material coating on the basis of the original steel plate to transform it into a double-layer structure. This technical route has great advantages, can extend the service life of the storage tank by more than 15 years without replacing the bottom plate, shortens the construction period compared with replacing the steel bottom plate, has a long service life, and can monitor the seepage and leakage condition of the bottom plate of the oil tank in real time through leakage alarm, thereby effectively protecting the soil and groundwater near the tank area from pollution caused by oil leakage, and saving the input cost of enterprises.

[0007] Meanwhile, some other double-layer structure bottom plates are also disclosed in the prior art.

[0008] Chinese patent document CN102785874B discloses a vertical storage tank leakage monitoring system with a double-layer tank bottom plate structure. The purpose is to provide a system that can realize real-time monitoring of the leakage condition of the bottom plate of a vertical storage tank. The technical solution is: a vertical storage tank leakage monitoring system with a double-layer tank bottom plate structure, comprising a vertical storage tank composed of a tank body and a tank bottom, and a leakage monitoring system for monitoring leakage gas; characterized in that the tank bottom comprises an upper layer bottom plate, a lower layer bottom plate, and a sealed cavity between the upper layer bottom plate and the lower layer bottom plate, and the leakage monitoring system comprises a circulation pipeline connected to the cavity and provided with a circulating pump, an inert gas source connected to the circulation pipeline, and a PLC control center connected to an infrared gas transmitter, a pressure transmitter, a temperature and humidity transmitter, and a circulating pump installed in the circulation pipeline through data lines.

[0009] This document uses a double-layer steel plate structure as the tank bottom. The monitoring means is to blow out the gas in the interlayer gap by a pump, and then detect the blown-out gas by a combustible gas detector to determine whether the storage tank is leaking. This monitoring cannot determine the specific leakage position, and the monitoring is passive monitoring, and the pump valve and the like used need to be explosion-proof, greatly increasing the volume of the monitoring system. However, the separation structure between the double-layer gaps is not described.

[0010] Chinese patent document CN206624262U discloses a double-layer tank bottom type storage tank with an outer protective wall, which comprises an inner tank with a double-layer tank bottom, the double-layer tank bottom comprising an upper tank bottom and a lower tank bottom, a cavity being formed between the upper tank bottom and the lower tank bottom, and an opening being provided on the tank wall of the inner tank and communicating with the cavity; and an outer protective wall is sleeved outside the inner tank, the upper end of the outer protective wall has an opening, the lower end of the outer protective wall is connected with an extension of the lower tank bottom, a liquid accumulation pit is recessed on the extension, a liquid level monitor is arranged in the liquid accumulation pit, and a containing cavity is formed between the outer protective wall and the inner tank, the containing cavity communicates with the cavity through the opening. The double-layer tank bottom type storage tank can solve the problem of double-side corrosion of the single-layer tank bottom, monitor the leakage of the tank bottom, and effectively control the diffusion of the leaked medium.

[0011] This structure is equivalent to building two nested oil tanks, which causes waste to some extent. In addition, the technology recesses a liquid accumulation pit on the extension of the lower tank bottom and arranges a liquid level monitor in the liquid accumulation pit to monitor the leakage. If the leakage area is to be accurately positioned, multiple liquid accumulation pits and multiple liquid level monitoring sensors need to be arranged, which is obviously impractical.

[0012] At the same time, it is specified in EN13160-7 and GB / T 30040.7 that the volume of the double-layer gap should be less than 8000L. For a storage tank with a large diameter, it is necessary to divide the area to control the volume of the interlayer gap to meet the standard requirements. Secondly, there are floating disc leg pads and other equipment leg obstacles on the bottom plate of the vertical storage tank, and how to ensure that the area separation and the obstacles are also double-layer structures. The existing technology does not involve the treatment method for these details.

[0013] Therefore, for the double-layer structure reform type bottom plate, it is the key to determine whether the bottom plate is a full double-layer structure to realize that the area separation and the obstacles are also double-layer structures, and it is the key problem that needs to be solved in the technology. SUMMARY

[0014] In view of the above technical problems, the present application aims to provide a double-layer structure for the boundary and obstacle of a vertical storage tank, which can ensure that the area separation of the bottom of the storage tank is also a double-layer structure.

[0015] According to the present application, a double-layer structure is provided, comprising:

[0016] a bottom plate;

[0017] a substrate layer arranged on the upper surface of the bottom plate;

[0018] a clamping plate layer arranged on the upper surface of the substrate layer, a plurality of blind holes being arranged on the clamping plate layer;

[0019] and a top sealing layer arranged on the upper surface of the clamping plate layer.

[0020] In a preferred embodiment according to the present application, the clamping plate layer comprises a plurality of clamping plate segments arranged in sequence along the upper surface of the substrate layer, and a partition sealing layer is arranged between any two adjacent clamping plate segments.

[0021] In a preferred embodiment according to the present application, the side surface of the clamping plate segment is arranged as an inclined surface, the lower end of the partition sealing layer is sealingly connected to the upper surface of the substrate layer, and the two side surfaces of the partition sealing layer are respectively sealingly connected to the side surfaces of the two adjacent clamping plate segments.

[0022] In a preferred embodiment according to the present application, the two adjacent clamping plate segments partially overlap in the vertical direction.

[0023] In a preferred embodiment, the side surface of the clamping plate segment is arranged as an inclined surface. In this embodiment, the two clamping plate segments on the left and right sides of the partition sealing layer are respectively named as a first clamping plate segment and a second clamping plate segment. The adjacent side surface of the first clamping plate segment and the second clamping plate segment is arranged as an inclined surface, and the inclination angles of the two are the same.

[0024] Further, the left and right side surfaces of the partition sealing layer are arranged as inclined surfaces that are adapted to the inclined surfaces of the first clamping plate segment and the second clamping plate segment, i.e., the left and right side surfaces of the partition sealing layer are respectively sealingly connected to the first clamping plate segment and the second clamping plate segment. The lower end of the partition sealing layer is sealingly connected to the upper surface of the substrate layer. The upper end of the partition sealing layer is sealingly connected to the top sealing layer.

[0025] In a preferred embodiment, the two adjacent clamping plate segments partially overlap in the vertical direction. That is, in this embodiment, the right end of the first clamping plate segment is located below the left end of the second clamping plate segment. Under this arrangement, the partition sealing layer can be better sealingly connected to the first clamping plate segment and the second clamping plate segment, and the partition structure of the double-layer gap is more secure.

[0026] In a preferred embodiment, the first and second interlayer plates are symmetrically arranged with respect to a center. For example, the second interlayer plate includes an inclined surface and a vertical surface. The inclined surface and the vertical surface can provide a firm seal between the partitioning seal layer and the first and second interlayer plates.

[0027] In a preferred embodiment according to the present application, the top seal layer is integrally formed with the partitioning seal layer.

[0028] In a preferred embodiment according to the present application, the top seal layer includes a plurality of seal plates arranged in sequence along the upper surface of the interlayer plate, and one end of the seal plates is integrally formed with the partitioning seal layer.

[0029] In a preferred embodiment according to the present application, the double-layer structure further includes a leakage monitoring mechanism for detecting the vacuum degree of the interlayer plate.

[0030] In a preferred embodiment according to the present application, a substrate layer, an interlayer plate, a top layer pad, an annular cover, a third interlayer plate, and a top seal layer are arranged in sequence above the bottom plate, the annular cover, the third interlayer plate, and the top seal layer are provided with through holes in the vertical direction, and an obstacle is fixed to the top layer pad through the through holes.

[0031] In a preferred embodiment according to the present application, the substrate layer includes a leg pad, and the leg pad, the interlayer plate, and the top layer pad are fixedly connected by bolts.

[0032] In a preferred embodiment according to the present application, the size of the interlayer plate and the top layer pad is smaller than the size of the leg pad, the inner size of the bottom end of the annular cover is equal to the outer size of the leg pad, the inner size of the upper end of the annular cover is equal to the outer size of the top layer pad, the lower part of the annular cover is sealingly connected to the bottom plate, and the upper part of the annular cover is sealingly connected to the top of the top layer pad.

[0033] In a preferred embodiment according to the present application, a plurality of connecting holes are arranged on the annular cover, and one end of the connecting holes is communicated to the interlayer plate.

[0034] In a preferred embodiment according to the present application, the annular cover and the top seal layer are tapered, and the other end of the connecting holes is communicated to the third interlayer plate.

[0035] Compared with the prior art, the present application has at least the following advantages.

[0036] In the General Requirements and Test Methods for Double-layer Gap, Anti-leakage Lining and Anti-leakage Jacket, it is stipulated that for double-layer structure storage tanks and bottom plates, the volume of the double-layer gap should be less than 8000L. For larger diameter storage tanks, it is necessary to divide the double-layer structure into regions to control the volume of the interlayer gap to meet the standard requirements. Secondly, there are floating disc leg pads and other equipment leg obstacles on the vertical storage tank bottom plate, and how to protect the region separation and obstacle is also a problem solved by the present application.

[0037] The present application provides a double-layer structure for the separation and obstacle of the vertical storage tank bottom plate, which can ensure the conversion of the vertical storage tank bottom plate into a double-layer structure and achieve full coverage of the double-layer region. BRIEF DESCRIPTION OF DRAWINGS

[0038] The present application will be described below with reference to the accompanying drawings.

[0039] Figure 1 shows a schematic view of an embodiment of the double-layer structure according to the present application;

[0040] Figure 2 shows a side structural schematic view of Figure 1 ;

[0041] Figure 3 shows an exploded schematic view of another embodiment of the double-layer structure according to the present application;

[0042] Figures 4A-4F shows a schematic view of the installation steps of the embodiment shown in Figure 3 ;

[0043] Figure 5 shows a structural schematic view of the top sealing layer and the third interlayer plate of the embodiment shown in Figure 3 ;

[0044] Figure 6A shows a structural schematic view of the annular cover and the top layer pad of the embodiment shown in Figure 3 ;

[0045] Figure 6B shows a bottom structural schematic view of the annular cover and the top layer pad of Figure 6A ;

[0046] In the drawings: 1, bottom plate; 2, lining layer; 3, interlayer plate; 31, first interlayer plate; 32, second interlayer plate; 4, top sealing layer; 41, first sealing plate; 42, second sealing plate; 5, separation sealing layer;

[0047] 21, leg pad; 22, top layer pad; 23, annular cover; 231, connecting hole; 24, third interlayer plate; 25, bolt; 26, threaded hole; 100, double-layer structure.

[0048] In the present application, all the drawings are schematic drawings for illustrating the principles of the present application only and are not drawn to scale. DETAILED DESCRIPTION

[0049] The present application will be described below with reference to the drawings.

[0050] It should be noted that the directional terms or limiting terms "upper", "lower", "left", "right" and the like used in the present application are relative to the drawings referred to. Figure 1 They are not used to limit the absolute position of the parts involved, but can vary according to the specific situation.

[0051] Example One:

[0052] Figure 1 The structure of the double-layer structure 100 according to the present application is shown. As shown, the double-layer structure 100 comprises a bottom plate 1, a substrate layer 2, a clamping plate layer 3 and a top sealing layer 4. Figure 1

[0053] In the general bottom area of the vertical storage tank, the bottom plate 1, the substrate layer 2, the clamping plate layer 3 and the top sealing layer 4 are laid from bottom to top at a time, i.e. the substrate layer 2 is laid on the upper surface of the bottom plate 1, the clamping plate layer 3 is laid on the upper surface of the substrate layer 2, and the top sealing layer 4 is laid on the upper surface of the clamping plate layer 3.

[0054] Specifically, the bottom plate 1 is the bottommost layer of the vertical storage tank and is made of steel material. The specific material of the bottom plate 1 is known in the art and will not be described here.

[0055] In a preferred embodiment, the clamping plate layer 3 is made of polypropylene material and is provided with a plurality of blind holes. The use of the clamping plate layer 3 made of polypropylene material with blind holes is low in price and helps to save costs, and on the other hand, polypropylene has a large rigidity, which can improve the overall rigidity of the double-layer structure 100.

[0056] In a specific embodiment, the blind holes on the clamping plate layer 3 are arranged in a plurality of transverse and longitudinal arrangements and are provided on the clamping plate layer 3 in a penetrating manner in the horizontal direction. The blind hole means that the upper and lower end faces of the clamping plate layer 3 are in a sealed state, and the horizontal side faces of the clamping plate layer 3 are in communication with the blind holes.

[0057] It should be noted that although the blind holes in the present embodiment are arranged in a transverse and longitudinal arrangement, the present application is not limited to this arrangement, as long as the storage tank fluid above the clamping plate layer 3 can be linked with the leakage monitoring mechanism through the blind holes after the upper and lower end faces of the clamping plate layer 3 leak.

[0058] ​In the embodiment, a leakage monitoring mechanism (not shown in the figure) is further arranged in connection with the clamping plate layer 3. The leakage monitoring mechanism adopts a vacuum extraction mode to monitor the vacuum degree of the clamping plate layer 3 in real time. Once leakage occurs, the leakage monitoring mechanism can detect the leakage through the change of the vacuum degree of the clamping plate layer 3.

[0059] Embodiment two:

[0060] Figure 1 and Figure 2 A schematic diagram of an embodiment of the double-layer structure 100 of the present application is shown. The embodiment is based on the embodiment one and provides a double-layer structure 100 for realizing the double-layer structure at the partition.

[0061] For a large-volume storage tank, due to the large area of the bottom plate 1, the double-layer structure cannot be directly made into an integral whole, and needs to be divided into regions so that the double-layer gap in each region is not through, on the one hand, to meet the requirement that the volume of the double-layer gap is less than 8000L as specified in the EN13160-7 and GB / T 30040.7 standards, and on the other hand, to ensure the independence of each region of the double-layer structure of the storage tank, so as to prevent oil leakage into the interlayer space of the entire bottom plate of the storage tank due to damage of a certain region.

[0062] It is easy to understand that the double-layer gap in the embodiment refers to the gap between the substrate layer 2 and the top sealing layer 4.

[0063] As shown in Figure 1 and Figure 2 The present application adopts a polypropylene plate with a blind hole array as the intermediate clamping plate layer 3. The clamping plate layer 3 includes a plurality of clamping plates arranged in sequence along the upper surface of the substrate layer 2, and a partition sealing layer 5 is arranged between adjacent two clamping plates. In this way, the requirement that the volume of the double-layer gap of the storage tank is less than 8000L is realized.

[0064] In a preferred embodiment, the side surface of the clamping plate is provided as an inclined surface. In the embodiment, the clamping plates on the left and right sides of the partition sealing layer 5 are respectively named as the first clamping plate 31 and the second clamping plate 32. The adjacent side of the first clamping plate 31 and the second clamping plate 32 is provided as an inclined surface, and the inclination angles of the two are the same.

[0065] Further, the left and right sides of the partition sealing layer 5 are provided as inclined surfaces that are adapted to the inclined surfaces of the first clamping plate 31 and the second clamping plate 32, i.e., the left and right sides of the partition sealing layer 5 are respectively sealingly connected with the first clamping plate 31 and the second clamping plate 32. The lower end of the partition sealing layer 5 is sealingly connected with the upper surface of the substrate layer 2. The upper end of the partition sealing layer 5 is sealingly connected with the top sealing layer 4.

[0066] In a preferred embodiment, the two adjacent interlayer plates partially overlap in the vertical direction. That is, in this embodiment, the right end of the first interlayer plate 31 is below the left end of the second interlayer plate 32. In this arrangement, the partition sealing layer 5 can be better sealed to the first interlayer plate 31 and the second interlayer plate 32, making the partition structure of the double-layer gap more secure.

[0067] In a preferred embodiment, as shown in FIG. 4, the adjacent sides of the first interlayer plate 31 and the second interlayer plate 32 are in a central symmetrical structure. Taking the structure of the second interlayer plate 32 as an example, the second interlayer plate 32 includes an inclined surface and a vertical surface. Due to the arrangement of the inclined surface and the vertical surface, the sealing connection of the partition sealing layer 5 to the first interlayer plate 31 and the second interlayer plate 32 can be more secure. Figure 1

[0068] In a preferred embodiment, the top sealing layer 4 is integrally formed with the partition sealing layer 5.

[0069] Further, the top sealing layer 4 includes a first sealing plate 41 and a second sealing plate 42. The first sealing plate 41 and the second sealing plate 42 are respectively located on the left and right sides of the partition sealing layer 5. The top sealing layer 4 is integrally formed with the right end of the first sealing plate 41, so that the included angle between the top sealing layer 4 and the first sealing plate 41 is greater than 90 degrees.

[0070] Specifically, the lower surface of the first sealing plate 41 is sealed to the first interlayer plate 31, and the right end of the first sealing plate 41 is integrally formed with the partition sealing layer 5. The right side of the partition sealing layer 5 is sealed to the second sealing plate 42 and the inclined surface of the second interlayer plate 32. The upper surface and the vertical surface of the second interlayer plate 32 are sealed to the second sealing plate 42.

[0071] The installation method of this embodiment is as follows. At the partition of the double-layer structure, first, the substrate layer 2 is arranged on the upper surface of the bottom plate 1, and after the substrate layer 2 is coated, the first interlayer plate 31 with a blind hole is installed, and then the right end of the partition sealing layer 5 is bonded to the substrate layer 2, and the left side of the partition sealing layer 5 is sealed to the first interlayer plate 31. Since the left end of the partition sealing layer 5 is integrally formed with the first sealing plate 41, the first sealing plate 41 is sealed to the upper surface of the first interlayer plate 31 when the partition sealing layer 5 is arranged.

[0072] Then, the second interlayer plate 32 with a blind hole is laid on the upper side of the substrate layer 2, and the left end of the second interlayer plate 32 is laid above the partition sealing layer 5 along the slope of the partition sealing layer 5.

[0073] Finally, the second sealing plate 42 is sealed to the upper surface of the second interlayer plate 32, and the left end of the second sealing plate 42 is sealed to the partition sealing layer 5 and the first sealing plate 41.​

[0074] In this way, the single-layer structure at the partition is eliminated, the partition of the interlayer is also formed into a double-layer structure, and the rupture and oil leakage at the partition can be monitored.

[0075] According to the present application, the double-layer structure 100 further comprises a leakage monitoring mechanism (not shown in the figure) for detecting the vacuum degree of the interlayer 3. In this way, the vacuum degree of the gap between the substrate layer 2 and the top sealing layer 4 can be monitored in real time without any semiconductor device arranged in the gap between the substrate layer 2 and the top sealing layer 4.

[0076] In a specific embodiment, the double-layer structure 100 ends at a height of 0.6 meters from the tank wall. A suitable area at a distance of 20 cm from the bottom plate is punched on the tank wall, and a stainless steel pipe with a diameter of 30 mm and a thickness of 2 mm is welded, which is communicated with the gap between the substrate layer 2 and the top sealing layer 4. A vacuum system and a vacuum gauge are installed on the stainless steel pipe, and the gap between the substrate layer 2 and the top sealing layer 4 is vacuumed to -70 KPa, and then sealed. Thus, the leakage monitoring of the gap between the substrate layer 2 and the top sealing layer 4 is implemented. When the vacuum degree decreases to below -35 KPa within 24 hours, it indicates that there is a leakage point between the substrate layer 2 and the top sealing layer 4, and at this time, the bottom plate 1 or the top sealing layer 4 leaks.

[0077] It should be noted that in the present embodiment, only a structure for detecting the vacuum degree of the gap between the substrate layer 2 and the top sealing layer 4 is provided as the leakage monitoring mechanism of the present application, but the specific structure of the leakage monitoring mechanism is not limited to the structure of the present application. Other existing leakage detection mechanisms used on the basis of the double-layer structure 100 of the present application should also be within the protection scope of the present application.

[0078] In the present embodiment, the interlayer gap is divided into two independent areas by the partition sealing layer 5 at the partition, and the leakage monitoring of the partition is also achieved by the alternating lapping of the first interlayer plate 31, the partition sealing layer 5 and the second interlayer plate 32.

[0079] The first interlayer plate 31, the partition sealing layer 5 and the second interlayer plate 32 at the partition are alternately lapped and change in a stepped manner, so that after the first interlayer plate 31, the partition sealing layer 5 and the second interlayer plate 32 are alternately lapped, the upper surface of the double-layer structure 100 is still a plane, avoiding the situation that the sealing area at the partition is protruded.

[0080] Embodiment Three:

[0081] In the interior of the vertical storage tank, various devices are usually required to be arranged. In order to fix these devices in the interior of the vertical storage tank, the device legs need to be fixed on the bottom plate 1, or a floating disc pad needs to be arranged. The double-layer structure of the prior art cannot directly cross the legs of the obstacle, so that the legs of the obstacle are single-layer structures. Therefore, once the legs are broken, leakage monitoring cannot be achieved.

[0082] Figures 3-6B A schematic diagram of another embodiment of the double-layer structure 100 according to the present application is shown. The present embodiment is based on the first embodiment and provides a double-layer structure 100 arranged at the position of the obstacle.

[0083] As shown in Figure 3 and Figure 5 , the substrate layer 2, the clamping plate layer 3, the top pad 22, the annular cover 23, the third clamping plate 24 and the top sealing layer 4 are sequentially arranged above the bottom plate 1. The annular cover 23, the third clamping plate 24 and the top sealing layer 4 are provided with through holes in the vertical direction, and the obstacle is fixed on the top pad 22 through the through holes.

[0084] Specifically, in the present embodiment, the bottom plate 1 is made of steel material, and the substrate layer 2 includes a leg pad 21. The leg pad 21, the clamping plate layer 3 and the top pad 22 are fixedly connected by bolts 25.

[0085] In the present embodiment, the leg pad 21, the clamping plate layer 3 and the top pad 22 are all arranged in a rectangular shape. Furthermore, a plurality of threaded holes 26 are arranged on the leg pad 21, the clamping plate layer 3 and the top pad 22 in the circumferential direction, for mounting the bolts 25.

[0086] It should be noted that although the leg pad 21, the clamping plate layer 3 and the top pad 22 in the present embodiment are all arranged in a rectangular shape, the present application is not limited to this structure. The leg pad 21, the clamping plate layer 3 and the top pad 22 can also be arranged in a circular shape or an irregular shape. Preferably, the shape of the leg pad 21, the clamping plate layer 3 and the top pad 22 is adapted to the shape of the device leg to be installed.

[0087] In a preferred embodiment, the size of the clamping plate layer 3 and the top pad 22 is smaller than the size of the leg pad 21. The inner size of the bottom end of the annular cover 23 is equal to the outer size of the leg pad 21, the inner size of the upper end of the annular cover 23 is equal to the outer size of the top pad 22, the lower part of the annular cover 23 is sealingly connected with the bottom plate 1, and the upper part of the annular cover 23 is sealingly connected with the top of the top pad 22.

[0088] Further, a plurality of connecting holes 231 are arranged on the annular cover 23 in the circumferential direction, and one end of the connecting hole 231 is communicated to the clamping plate layer 3.

[0089] The annular cover 23 and the top sealing layer 4 are arranged in a conical shape, and the third clamping layer 24 is arranged between the annular cover 23 and the top sealing layer 4. The two ends of the connecting hole 231 on the annular cover 23 are respectively communicated to the clamping layer 3 and the third clamping layer 24.

[0090] The lower end of the annular cover 23 is sealingly connected to the bottom plate 1, the top of the annular cover 23 is located above the top layer of the pad plate 22, and the top of the annular cover 23 abuts against the upper end surface of the top layer of the pad plate 22 and is sealingly connected.

[0091] The mounting method of the embodiment is as follows. As shown in Figure 4A , first, the position where the equipment leg needs to be mounted is determined on the bottom plate 1, and the leg pad plate 21 is welded at the position of the bottom plate 1. The pin hole is punched and threaded on the leg pad plate 21 to form the threaded hole 26.

[0092] As shown in Figure 4B , the polypropylene clamping layer 3 with a blind hole is laid on the processed leg pad plate 21, and the pin through hole is punched on the clamping layer 3 corresponding to the position of the threaded hole 26 of the leg pad plate 21.

[0093] As shown in Figure 4C , the top layer of the pad plate 22 is laid above the clamping layer 3, and the pin through hole is punched and threaded on the top layer of the pad plate 22 corresponding to the position of the threaded hole 26 of the leg pad plate 21.

[0094] As shown in Figure 4D , the bolt 25 adopts a countersunk screw, and the top layer of the pad plate 22, the clamping layer 3 and the leg pad plate 21 are fixed, and the top layer of the pad plate 22, the clamping layer 3 and the leg pad plate 21 are fixed as a whole on the tank bottom plate 1.

[0095] As shown in Figure 4E , the annular cover 23 is installed at the step formed by the top layer of the pad plate 22 and the leg pad plate 21. Specifically, the inner dimension of the lower end of the annular cover 23 is the same as the outer dimension of the leg pad plate 21, and the lower end of the annular cover 23 can be sealingly connected to the bottom plate 1. The inner dimension of the upper end of the annular cover 23 is the same as the outer dimension of the top layer of the pad plate 22, and after the lower end of the annular cover 23 is sealingly connected to the bottom plate 1, the upper end surface of the top layer of the pad plate 22 is parallel to the upper end of the annular cover 23, so that the top layer of the pad plate 22 and the top of the annular cover 23 are adapted.

[0096] Among them, the connecting hole 231 is arranged on the annular cover 23, and the lower side of the connecting hole 231 is communicated with the blind hole area of the clamping layer 3.

[0097] The lower part of the annular cover 23 is sealed with the bottom plate 1, and the upper part of the annular cover 23 is sealed with the top layer of the pad plate 22, and then the connecting hole 231 of the annular cover 23 is inflated to ensure that the connecting hole 231 is communicated with the blind hole of the clamping layer 3 inside.

[0098] AsFigure 4F and Figure 5 As shown in the drawings, a third interlayer plate 24 with blind holes is laid on top of the annular cover 23, the blind holes of the third interlayer plate 24 are in communication with the upper side of the connecting holes 231 of the annular cover 23, and a top sealing layer 4 is laid on top of the third interlayer plate 24, thereby sealing the entire structure.

[0099] Finally, the equipment legs are welded to the top layer of the base plate 22 in the areas not covered by the top sealing layer 4.

[0100] After the obstacles (equipment legs) are welded to the top layer of the base plate 22, the top layer of the base plate 22 and the annular cover 23 (except the connecting holes 231) are fully covered with epoxy resin, thereby ensuring that the top layer of the base plate 22 does not directly contact the storage medium in the storage tank and ensuring that the joint between the top layer of the base plate 22 and the annular cover 23 is sealed.

[0101] In a specific embodiment, the substrate layer 2 in Embodiment One is laid on the bottom plate 1 in the positions where the leg base plates 21 are not provided. The annular cover 23 is bonded to the bottom surface of the substrate layer 2 with epoxy resin to ensure the fixation and sealing of the structure. The connecting holes 231 are provided through the annular cover 23 to connect the interlayer plate 3 and the third interlayer plate 24.

[0102] In this embodiment, holes are provided in the top sealing layer 4 for connecting with the leakage detection mechanism, so that the leakage detection mechanism can monitor the vacuum degree in the third interlayer plate 24 and the interlayer plate 3 in real time and discover leaks in a timely manner.

[0103] The double-layer structure 100 provided in this embodiment can be used to modify the obstacles on the bottom plate 1, and the double-layer structure can be maintained at the positions where the obstacles are installed, thereby achieving the leakage monitoring of the bottom plate 1 at the positions of the obstacles.

[0104] Embodiment Four:

[0105] The bottom plate 1 is processed:

[0106] For the in-service storage tank, the tank is cleaned and ventilated, and the uneven settlement of the tank is evaluated, especially the uneven settlement of the lower part of the bottom plate 1. If the foundation settlement of the bottom plate 1 is too large, the bottom plate 1 will be excessively deformed when the storage tank is filled with oil, which may cause the double-layer structure to be torn or the inner liner to have micro-cracks. For the areas with excessive foundation settlement, small holes are opened in the bottom plate 1 of the storage tank, and epoxy putty paste is injected, and then the small holes are repaired with epoxy glass steel material.

[0107] Check the thickness of the bottom plate 1 to ensure that the thickness of the bottom plate 1 is greater than or equal to 1.25 mm. If necessary, perform a magnetic flux leakage (MFL) scan on the bottom plate 1. In the case of extensive corrosion of the bottom plate 1, patch the original bottom plate 1 with steel plates or replace the new bottom plate 1.

[0108] Sandblast the bottom plate 1 and the area below 0.6 meters of the tank wall to Sa2.5 level. If there are protrusions or weld overlap areas on the bottom plate 1, and if there are edges, barbs, etc., they should be polished according to the situation to prevent deformation and puncture of the inner liner due to stress.

[0109] Repair the corrosion pits, perforations, and cracks in the bottom plate 1 according to the hole conditions. After repair, make the entire bottom plate 1 surface smooth. Repair and seal the large angle welds on the tank bottom plate 1, the bottom plate welds, the support plates under the floating disc support legs, rivets, and the bottom plate 1 equipment support legs with metal repair agent, and then use epoxy putty for transition treatment.

[0110] Process the general area of the bottom plate 1:

[0111] Use airless spraying to spray the bottom plate 1 and the area below 0.6 meters of the tank wall with a primer layer 2. Remove debris and dust before spraying. The coating fully covers the entire bottom plate 1 and the lower edge of the tank wall seal layer.

[0112] After the primer layer 2 is completely cured, apply the batten layer 3, and then spray the top sealing layer 4.

[0113] Implementation of the partition area:

[0114] Use a polypropylene plate with a blind hole array as the batten layer 3. After the primer layer 2 is applied, install the first batten plate 31 at the partition of the double-layer structure, and then use the partition sealing layer 5 to bond with the primer layer 2 and seal one side of the first batten plate 31. Then lay the second batten plate 32 on the other side, and lay the second batten plate 32 along the slope to the top of the partition sealing layer 5, and then bond the partition sealing layer 5 with the top sealing layer 4. Figure 1 Figure 2

[0115] Implementation at obstacles:

[0116] As shown in Figures 3-6B , if the obstacle (such as the equipment support leg) has been welded with the original bottom plate 1, first separate the obstacle from the original bottom plate 1 using cutting or other methods, and then polish the original obstacle and the welding site. After that, weld the support leg pad 21 at the original equipment support leg of the bottom plate 1, drill blind holes and tap screws on the support leg pad 21, and lay the batten layer 3 on the treated support leg pad 21, and drill screw holes on the corresponding position of the batten layer 3.

[0117] ​​The top layer pad 22 is laid on the clamping plate layer 3, and the top layer pad 22 should be sandblasted in advance. In the corresponding position, the top layer pad 22 is punched and threaded, and then the top layer pad 22, the clamping plate layer 3 and the leg pad 21 are fixed as a whole on the tank bottom plate 1 by using the countersunk screws. After that, the above-mentioned parts are polished to avoid damage.

[0118] At the step formed by the top layer pad 22 and the leg pad 21, the annular cover 23 is installed, and the upper end and the lower end of the annular cover 23 are bonded to the original bottom plate 1 and the top layer pad 22 respectively by using epoxy resin. The annular cover 23 is provided with a connecting hole 231, and the lower side of the connecting hole 231 is communicated with the blind hole area of the clamping plate layer 3. After that, the connecting hole 231 of the annular cover 23 is inflated to ensure that the connecting hole 231 is communicated with the blind hole of the clamping plate layer 3 inside.

[0119] After that, the third clamping layer plate 24 is laid on the upper side of the annular cover 23, the blind hole of the third clamping layer plate 24 is communicated with the connecting hole 231 of the annular cover 23, and the top sealing layer 4 is laid on the upper side of the third clamping layer plate 24 to seal the whole structure. Thus, the double-layer structure at the obstacle is completed.

[0120] The equipment leg is welded on the area of the top layer pad 22 which is not covered by the top sealing layer 4, the welding slag is cleaned and polished, and then the uncovered part of the top layer pad 22 is coated with epoxy resin, so that the whole structure is covered with epoxy resin.

[0121] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0122] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0123] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0124] Finally, it should be noted that the above only describes the preferred embodiments of the present application and does not constitute any limitation on the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A double-layer structural component for use at the boundary and obstacle locations of vertical storage tanks, characterized in that, include: Base plate (1); Substrate layer (2) disposed on the upper surface of the base plate (1); A clamping layer (3) is disposed on the upper surface of the substrate layer (2), and a plurality of blind holes are provided on the clamping layer (3); Top layer pad (22) disposed above the sandwich layer (3); The annular cover (23) is set in a conical shape, the lower end of the annular cover (23) is sealed to the bottom plate (1), and the upper part of the annular cover (23) is sealed to the top layer pad (22); A top sealing layer (4) is disposed above the clamping layer (3) and the annular cover (23); A plurality of connecting holes (231) are provided on the annular cover (23), and the two ends of the connecting holes (231) respectively connect the clamping layer (3) on the inner and outer sides of the annular cover (23); A leak monitoring mechanism for detecting the vacuum level of the sandwich layer (3); Through holes are provided in the vertical direction on the annular cover (23), the third interlayer plate (24) and the top sealing layer (4), and obstacles are fixed on the top layer pad (22) by passing through the through holes.

2. The double-layer structural component according to claim 1, characterized in that, The sandwich layer (3) includes a plurality of sandwich plates arranged sequentially along the upper surface of the substrate layer (2), and a separating sealing layer (5) is provided between two adjacent sandwich plates.

3. The double-layer structural component according to claim 2, characterized in that, The side of the sandwich panel is set as an inclined surface, the lower end of the separation sealing layer (5) is sealed to the upper surface of the substrate layer (2), and the two sides of the separation sealing layer (5) are respectively sealed to the sides of the two adjacent sandwich panels.

4. The double-layer structural component according to claim 3, characterized in that, The two adjacent sandwich panels partially overlap in the vertical direction.

5. The double-layer structural component according to any one of claims 2 to 4, characterized in that, The top sealing layer (4) and the partition sealing layer (5) are integrally formed.

6. The double-layer structural component according to claim 5, characterized in that, The top sealing layer (4) includes a plurality of sealing plates arranged sequentially along the upper surface of the sandwich layer (3), one end of which is integrally formed with the partition sealing layer (5).

7. The double-layer structural component according to any one of claims 1 to 4, characterized in that, The substrate layer (2) includes a leg pad (21), and the leg pad (21), the clamping plate layer (3) and the top plate (22) are fixedly connected by bolts.

8. The double-layer structural component according to claim 7, characterized in that, The dimensions of the sandwich layer (3) and the top pad (22) are smaller than the dimensions of the leg pad (21). The inner dimension of the bottom end of the annular cover (23) is equal to the outer dimension of the leg pad (21), and the inner dimension of the upper end of the annular cover (23) is equal to the outer dimension of the top pad (22).

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