Double-layer structural member for boundary and barrier of vertical storage tank

Abstract

The invention belongs to the technical field of double-layer storage tanks, and particularly relates to a double-layer structural member for a boundary and an obstacle of a vertical storage tank. The double-layer structural member comprises a bottom plate; the substrate layer is arranged on the upper surface of the bottom plate; the plywood layer is arranged on the upper surface of the substrate layer, and a plurality of blind holes are formed in the plywood layer; and the top sealing layer is arranged on the upper surface of the plywood layer.

Description

Technical Field

[0001] The invention belongs to the technical field of double-layer storage tanks, and in particular relates to a double-layer structural member used at the boundary and obstacle of a vertical storage tank. Background Art

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

[0003] Generally speaking, the design service life of a vertical storage tank is more than 30 years, but the thickness of its bottom plate is only about 6 mm. The water deposited at the bottom of the tank is prone to electrolytic corrosion and chemical corrosion, which leads to a large gap between the actual service life of the tank bottom plate and its design life. Especially when corrosive media are stored in the tank, some tanks will experience bottom plate corrosion and perforation within 5 years.

[0004] Leakage caused by corrosion of the tank bottom is difficult to detect, and the cost of remediation of soil and groundwater pollution caused by leakage is huge.

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

[0006] This technology mainly involves adding composite material coating to the original steel plate to transform it into a double-layer structure. This technical route has great advantages. It can extend the life of the storage tank by more than 15 years without replacing the bottom plate. Compared with replacing the steel bottom plate, it shortens the construction period and has a long service life. Through the leakage alarm, the leakage status of the oil tank bottom plate is monitored in real time, effectively protecting the soil and groundwater near the tank area from pollution caused by oil leakage, saving investment costs for enterprises.

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

[0008] Chinese patent document CN102785874B discloses a vertical tank leakage monitoring system with a double-layer tank bottom structure. The purpose is to provide a system that can realize real-time monitoring of the leakage status of the tank bottom of a vertical tank. The technical solution is: a vertical tank leakage monitoring system with a double-layer tank bottom structure, including a vertical tank composed of a tank body and a tank bottom and a leakage monitoring system for monitoring leaked gas; it is characterized in that the tank bottom includes an upper bottom plate, a lower bottom plate and a closed cavity between the upper bottom plate and the lower bottom plate, and the leakage monitoring system includes a circulation pipeline equipped with a circulation pump and connected to the cavity, an inert gas source connected to the circulation pipeline, and an infrared gas transmitter, a pressure transmitter, a temperature and humidity transmitter and a PLC control center of the circulation pump respectively connected to the circulation pipeline through a data line.

[0009] The document uses a double-layer steel plate structure as the tank bottom. The monitoring method is to blow out the gas in the interlayer gap through a pump, and then detect the blown gas through a combustible gas detector to determine whether the tank is leaking. This monitoring cannot determine the specific leakage location, and the monitoring is passive monitoring, and the pumps and valves used need to be explosion-proof, which greatly increases the size of the monitoring system. However, the partition structure between the double-layer gap is not explained.

[0010] Chinese patent document CN206624262U discloses a double-layer tank bottom storage tank with an outer protective wall, which includes: an inner tank, which has a double-layer tank bottom, the double-layer tank bottom includes an upper tank bottom and a lower tank bottom, a cavity is formed between the upper tank bottom and the lower tank bottom, and an opening connected to the cavity is provided on the tank wall of the inner tank; an outer protective wall, which 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 to the extension of the lower tank bottom, the extension is concavely provided with a liquid accumulation pit, a liquid level monitor is provided in the liquid accumulation pit, and a receiving cavity is formed between the outer protective wall and the inner tank, and the receiving cavity is connected to the cavity through the opening. The utility model can not only solve the double-sided corrosion problem existing in the single-layer tank bottom, but also monitor the leakage of the tank bottom, and can effectively control the diffusion of the leaked medium.

[0011] This structure is equivalent to building two nested oil tanks, which is wasteful to a certain extent. In addition, this technology detects leaks by setting a liquid accumulation pit on the extension of the bottom of the lower tank and setting a liquid level monitor in the liquid accumulation pit. If the leak area is to be accurately located, multiple liquid accumulation pits and multiple liquid level monitoring sensors need to be set up, which is obviously impractical.

[0012] At the same time, EN13160-7 and GB / T 30040.7 stipulate that the volume of the double-layer gap should be less than 8000L. For storage tanks with larger diameters, it is necessary to divide them into regions to control the interlayer gap volume to meet the standard requirements. Secondly, there are obstacles such as floating plate leg pads and other equipment legs on the bottom plate of the vertical storage tank. How to ensure that the area separation and obstacles are also double-layer structures? The current existing technology does not involve the treatment methods of these details.

[0013] Therefore, for the double-layer structure modified base plate, achieving double-layer structure at the area separation and obstacles is the key to determining whether the base plate is a full double-layer structure, and is a key issue that needs to be solved in this technology. Summary of the invention

[0014] In view of the technical problems mentioned above, the present invention aims to propose a double-layer structure for use at the boundary and obstacles of a vertical storage tank, which can ensure that the bottom of the storage tank is also divided into a double-layer structure.

[0015] According to the present invention, there is provided a double-layer structural member, comprising:

[0016] Base plate;

[0017] A substrate layer disposed on the upper surface of the base plate;

[0018] A sandwich layer is arranged on the upper surface of the substrate layer, and a plurality of blind holes are arranged on the sandwich layer;

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

[0020] In a preferred embodiment provided according to the present invention, the sandwich layer includes a plurality of sandwich panels sequentially arranged along the upper surface of the substrate layer, and a separation sealing layer is arranged between two adjacent sandwich panels.

[0021] In a preferred embodiment provided according to the present invention, the side surface of the sandwich panel is arranged as a slope, the lower end of the separation sealing layer is sealed to the upper surface of the substrate layer, and the two side surfaces of the separation sealing layer are respectively sealed to the side surfaces of two adjacent sandwich panels.

[0022] In a preferred embodiment provided according to the present invention, two adjacent sandwich panels partially overlap in the vertical direction.

[0023] In a preferred embodiment, the side of the sandwich plate is set as an inclined surface. In this embodiment, the sandwich plates on the left and right sides of the separation sealing layer are named as the first sandwich plate and the second sandwich plate respectively. The adjacent sides of the first sandwich plate and the second sandwich plate are both set as inclined surfaces, and the inclination angles of the two are the same.

[0024] Further, the left and right sides of the separation sealing layer are set as inclined surfaces that match the inclined surfaces of the first sandwich panel and the second sandwich panel, that is, the left and right sides of the separation sealing layer are respectively sealed and connected to the first sandwich panel and the second sandwich panel. The lower end of the separation sealing layer is sealed and connected to the upper surface of the substrate layer. The upper end of the separation sealing layer is sealed and connected to the top sealing layer.

[0025] In a preferred embodiment, two adjacent sandwich panels partially overlap in the vertical direction. That is, in this embodiment, the right end of the first sandwich panel is located below the left end of the second sandwich panel. Under this arrangement, the separation sealing layer can be better sealed and connected with the first sandwich panel and the second sandwich panel, making the separation structure of the double-layer gap more solid.

[0026] In a preferred embodiment, as shown in the figure, the adjacent sides of the first sandwich plate and the second sandwich plate are of a central symmetrical structure. Taking the structure of the second sandwich plate as an example, the second sandwich plate includes an inclined surface and a vertical surface. Due to the arrangement of the inclined surface and the vertical surface, the sealing connection between the separation sealing layer and the first sandwich plate and the second sandwich plate can be made more secure.

[0027] In a preferred embodiment provided according to the present invention, the top sealing layer and the separation sealing layer are integrally formed.

[0028] In a preferred embodiment provided according to the present invention, the top sealing layer comprises a plurality of sealing plates sequentially arranged along the upper surface of the sandwich layer, and one end of the sealing plate is integrally formed with the separation sealing layer.

[0029] In a preferred embodiment provided according to the present invention, the double-layer structural member further includes a leakage monitoring mechanism for detecting the vacuum degree of the sandwich layer.

[0030] In a preferred embodiment provided according to the present invention, a substrate layer, a sandwich layer, a top pad, an annular cover, a third sandwich plate and a top sealing layer are sequentially arranged above the bottom plate, and through holes are arranged in the vertical direction on the annular cover, the third sandwich plate and the top sealing layer, and obstacles are fixed on the top pad through the through holes.

[0031] In a preferred embodiment provided according to the present invention, the substrate layer comprises a leg pad, and the leg pad, the plywood layer and the top pad are fixedly connected by bolts.

[0032] In a preferred embodiment provided according to the present invention, the sizes of the plywood layer and the top pad are smaller than those 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 pad, the lower part of the annular cover is sealed to the bottom plate, and the upper part of the annular cover is sealed to the top of the top pad.

[0033] In a preferred embodiment provided according to the present invention, a plurality of connection holes are provided on the annular cover, and one end of the connection hole is connected to the plywood layer.

[0034] In a preferred embodiment provided according to the present invention, the annular cover and the top sealing layer are configured to be conical, and an end of the connecting hole away from the sandwich layer is connected to the third sandwich plate.

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

[0036] It is stipulated in the "General Requirements and Test Methods for Double-layer Gaps, Leak-proof Liners and Leak-proof Jackets" that for double-layer storage tanks and bottom plates, the volume of the double-layer gap should be less than 8000L. For storage tanks with larger diameters, it is necessary to divide the double-layer structure into regions to control the interlayer gap volume to meet the standard requirements. Secondly, there are obstacles such as floating plate leg pads and other equipment legs on the bottom plate of the vertical storage tank. How to ensure that the area separation and obstacles are also double-layer structures is the problem solved by the present invention.

[0037] The present invention provides a double-layer structural member at a partition and an obstacle of a bottom plate of a vertical storage tank, which can ensure that the bottom plate of the vertical storage tank is transformed into a double-layer structure to achieve full coverage of the double-layer area. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0039] Figure 1 A schematic diagram showing an embodiment of a double-layer structural member according to the present invention;

[0040] Figure 2 Shows Figure 1 A schematic diagram of the side structure of

[0041] Figure 3 An exploded schematic diagram showing another embodiment of a double-layer structural member according to the present invention;

[0042] Figure 4A to Figure 4F Shows Figure 3 A schematic diagram of the installation steps of the embodiment shown;

[0043] Figure 5 Shows Figure 3 A schematic diagram of the structure of the top sealing layer and the third sandwich panel of the embodiment shown;

[0044] Fig. 6A Shows Figure 3 A schematic diagram of the structure of the annular cover and the top pad of the embodiment shown;

[0045] Figure 6B Shows Fig. 6A Schematic diagram of the structure of the annular cover and the top pad from an upward perspective.

[0046] In the figure: 1, bottom plate; 2, substrate layer; 3, sandwich layer; 31, first sandwich plate; 32, second sandwich plate; 321, inclined surface; 322, vertical surface; 4, top sealing layer; 41, first sealing plate; 42, second sealing plate; 5, partition sealing layer;

[0047] 21. Leg pad; 22. Top pad; 23. Annular cover; 231. Connecting hole; 24. Third sandwich plate; 25. Bolt; 26. Threaded hole; 100. Double-layer structural member.

[0048] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

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

[0050] It should be noted that the directional terms or qualifiers "upper", "lower", "left", "right", etc. used in this application are all relative to the referenced Figure 1 They are not intended to define the absolute positions of the components involved, but may vary depending on the specific circumstances.

[0051] Embodiment 1:

[0052] Figure 1 The structure of the double-layer structural member 100 according to the present invention is shown. Figure 1 As shown, the double-layer structural member 100 includes a bottom plate 1 , a substrate layer 2 , a sandwich layer 3 and a top sealing layer 4 .

[0053] In the common bottom area of ​​the vertical storage tank, the bottom plate 1, the substrate layer 2, the plywood layer 3 and the top sealing layer 4 are laid at once from bottom to top, that is, the substrate layer 2 is laid on the upper surface of the bottom plate 1, the plywood 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 plywood layer 3.

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

[0055] In a preferred embodiment, the plywood layer 3 is made of polypropylene material, and a plurality of blind holes are provided on the plywood layer 3. The plywood layer 3 with blind holes made of polypropylene material is cheap and helps save costs. On the other hand, polypropylene has greater rigidity, which can improve the overall rigidity of the double-layer structural member 100.

[0056] In a specific embodiment, the blind holes on the plywood layer 3 are arranged in a plurality of transverse and longitudinal structures, and are arranged in a horizontal direction through the plywood layer 3. The blind holes refer to that the upper and lower end surfaces of the plywood layer 3 are evenly sealed, and the horizontal side surfaces of the plywood layer 3 are connected to the blind holes.

[0057] It should be noted that although the blind holes in this embodiment are arranged horizontally and vertically, the present invention is not limited to this arrangement, as long as it can be ensured that after leakage occurs on the upper and lower end surfaces of the plywood layer 3, the tank fluid above the plywood layer 3 can be linked with the leakage monitoring mechanism through the blind holes.

[0058] In this embodiment, a leakage monitoring mechanism (not shown) connected to the sandwich layer 3 is also provided. The leakage monitoring mechanism uses a vacuum pumping method to monitor the vacuum degree of the sandwich layer 3 in real time. Once a leakage occurs, the leakage monitoring mechanism can detect it through the change of the vacuum degree of the sandwich layer 3.

[0059] Embodiment 2:

[0060] Figure 1 and Figure 2 A schematic diagram of an embodiment of a double-layer structural member 100 of the present invention is shown. Based on the first embodiment, this embodiment provides a double-layer structural member 100 for realizing a double-layer structure at a partition.

[0061] For large-volume storage tanks, due to the large area of ​​the bottom plate 1, its double-layer structure cannot be directly made into a through whole, and it is necessary to divide the areas so that the double-layer gaps in each area are not through. On the one hand, it meets the requirement that the volume of the double-layer gap is less than 8000L specified in the EN13160-7 and GB / T 30040.7 standards, and on the other hand, it ensures the independence of each area of ​​the double-layer structure of the tank to prevent oil from leaking into the interlayer space of the entire bottom plate of the tank due to damage to a certain area.

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

[0063] like Figure 1 and Figure 2 As shown, the present invention uses a polypropylene plate with a blind hole array as the middle sandwich layer 3, and the sandwich layer 3 includes a plurality of sandwich plates arranged in sequence along the upper surface of the substrate layer 2, and a separation sealing layer 5 is arranged between two adjacent sandwich plates. In this way, the requirement that the volume of the double-layer gap of the storage tank is less than 8000L is achieved.

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

[0065] Further, the left and right sides of the separation sealing layer 5 are set as inclined surfaces that match the inclined surfaces of the first sandwich panel 31 and the second sandwich panel 32, that is, the left and right sides of the separation sealing layer 5 are respectively sealed and connected to the first sandwich panel 31 and the second sandwich panel 32. The lower end of the separation sealing layer 5 is sealed and connected to the upper surface of the substrate layer 2. The upper end of the separation sealing layer 5 is sealed and connected to the top sealing layer 4.

[0066] In a preferred embodiment, two adjacent sandwich panels partially overlap in the vertical direction. That is, in this embodiment, the right end of the first sandwich panel 31 is located below the left end of the second sandwich panel 32. Under this arrangement, the separation sealing layer 5 can be better sealed and connected with the first sandwich panel 31 and the second sandwich panel 32, making the separation structure of the double-layer gap more solid.

[0067] In a preferred embodiment, Figure 1 As shown, the adjacent sides of the first sandwich plate 31 and the second sandwich plate 32 are of a central symmetrical structure. Taking the structure of the second sandwich plate 32 as an example, the second sandwich plate 32 includes an inclined surface 321 and a vertical surface 322. Due to the arrangement of the inclined surface 321 and the vertical surface 322, the sealing connection between the separation sealing layer 5 and the first sandwich plate 31 and the second sandwich plate 32 can be made more secure.

[0068] In a preferred embodiment, the top sealing layer 4 and the separation sealing layer 5 are integrally formed.

[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 separation sealing layer 5. The top sealing layer 4 is integrally formed with the right end of the first sealing plate 41, so that the 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 sandwich 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 321 of the second sandwich plate 32. The upper surface and the vertical surface 322 of the second sandwich plate 32 are sealed to the second sealing plate 42.

[0071] The installation method of this embodiment is as follows. At the separation of the double-layer structure, the substrate layer 2 is first set on the upper surface of the bottom plate 1. After the substrate layer 2 is coated, the first polypropylene sandwich plate 31 with blind holes is first installed, and then the right end of the separation sealing layer 5 is bonded to the substrate layer 2, and the left side of the separation sealing layer 5 is sealed with the first sandwich plate 31. Since the left end of the separation sealing layer 5 is integrally formed with the first sealing plate 41, the first sealing plate 41 is sealed and connected to the upper surface of the first sandwich plate 31 while the separation sealing layer 5 is set.

[0072] Then, a second polypropylene sandwich panel 32 with blind holes is laid on the upper side of the substrate layer 2 , and the left end of the second sandwich panel 32 is laid along the slope of the partition sealing layer 5 to above the partition sealing layer 4 .

[0073] Finally, the second sealing plate 42 is sealed to the upper surface of the second sandwich 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, and a double-layer structure is formed at the sandwich partition, ensuring that oil leakage can be monitored when it breaks.

[0075] According to the present invention, the double-layer structural member 100 further includes a leakage monitoring mechanism (not shown in the figure) for detecting the vacuum degree of the sandwich layer 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 arranging any semiconductor device in the gap between the substrate layer 2 and the top sealing layer 4.

[0076] In a specific embodiment, the double-layer structural member 100 ends at a height of 0.6 meters on the tank wall. A suitable area 20 cm away from the bottom plate is selected on the tank wall for drilling, and a stainless steel pipe with a diameter of 30 mm and a thickness of 2 mm is welded. The stainless steel pipe is connected to 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. The gap between the substrate layer 2 and the top sealing layer 4 is vacuumed to -70 KPa and then sealed. Thus, leakage monitoring of the gap between the substrate layer 2 and the top sealing layer 4 is implemented. When the vacuum degree drops below -35 KPa within 24 hours, it indicates that there is a leakage point in the gap 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 is leaking.

[0077] It should be noted that, in this embodiment, only a structure is provided for detecting the vacuum degree of the gap between the substrate layer 2 and the top sealing layer 4, which is used as the leakage monitoring mechanism of the present invention. However, the specific structure of the leakage monitoring mechanism is not limited to the structure of the present invention. The use of other existing leakage detection mechanisms based on the double-layer structural member 100 of the present invention should also be within the protection scope of the present invention.

[0078] In this embodiment, the separation sealing layer 5 is used at the separation to divide the interlayer gap into two independent areas, and leakage monitoring can also be achieved at the separation by alternately overlapping the first interlayer plate 31, the separation sealing layer 5 and the second interlayer plate 32.

[0079] The first sandwich panel 31, the partition sealing layer 5 and the second sandwich panel 32 at the partition are overlapped alternately in a step-like manner, so that after the first sandwich panel 31, the partition sealing layer 5 and the second sandwich panel 32 are overlapped alternately, the upper surface of the double-layer structural member 100 is still a plane, avoiding the situation where the sealing area at the partition is raised.

[0080] Embodiment three:

[0081] It is usually necessary to install various equipment inside the vertical storage tank. In order to fix these equipment inside the vertical storage tank, the legs of these equipment need to be fixed on the bottom plate 1, or a floating plate pad needs to be installed. The double-layer structure of the prior art cannot directly cross the legs of the obstacle, resulting in the legs of the obstacle being a single-layer structure. Therefore, once the legs are broken, leakage monitoring cannot be achieved.

[0082] Figure 3 to Figure 6B A schematic diagram of another embodiment of a double-layer structure 100 according to the present invention is shown. Based on the first embodiment, this embodiment provides a double-layer structure 100 for being arranged at an obstacle position.

[0083] like Figure 3 and Figure 5 As shown, a substrate layer 2, a sandwich layer 3, a top pad 22, an annular cover 23, a third sandwich plate 24 and a top sealing layer 4 are arranged in sequence above the bottom plate 1, and through holes are arranged in the vertical direction on the annular cover 23, the third sandwich plate 24 and the top sealing layer 4, and obstacles are fixed on the top pad 22 through the through holes.

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

[0085] In this embodiment, the leg pad 21, the plywood layer 3 and the top pad 22 are all arranged in a rectangular shape. In addition, a plurality of threaded holes 26 are arranged circumferentially on the leg pad 21, the plywood layer 3 and the top pad 22 for mounting bolts 25.

[0086] It should be noted that, although the leg pad 21, the plywood layer 3 and the top pad 22 in this embodiment are all set to be rectangular, the present invention is not limited to this structure, and the leg pad 21, the plywood layer 3 and the top pad 22 can also be set to be circular or irregular. Preferably, the shape of the leg pad 21, the plywood layer 3 and the top pad 22 is adapted to the shape of the equipment leg to be installed.

[0087] In a preferred embodiment, the sizes of the plywood layer 3 and the top pad 22 are smaller than those 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 sealed connected to the bottom plate 1, and the upper part of the annular cover 23 is sealed connected to the top of the top pad 22.

[0088] Furthermore, a plurality of connection holes 231 are provided on the annular cover 23 along the circumferential direction, and one end of the connection hole 231 is connected to the plywood layer 3 .

[0089] The annular cover 23 and the top sealing layer 4 are configured to be conical, and the third sandwich plate 24 is located between the annular cover 23 and the top sealing layer 4. Both ends of the connecting hole 231 on the annular cover 23 are connected to the sandwich layer 3 and the third sandwich plate 24 respectively.

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

[0091] The installation method of this embodiment is as follows. Figure 4A As shown, first determine the position where the equipment legs need to be installed on the base plate 1, and weld the leg pad 21 at the position of the base plate 1. Punch a pin blind hole on the leg pad 21 and tap it to form a threaded hole 26.

[0092] like Figure 4B As shown, a polypropylene plywood layer 3 with blind holes is laid on the processed leg pad 21 , and pin through holes are punched on the plywood layer 3 at positions corresponding to the threaded holes 26 of the leg pad 21 .

[0093] like Figure 4C As shown, a top pad 22 is laid on top of the plywood layer 3, and pin holes are punched and tapped at positions of the top pad 22 corresponding to the threaded holes 26 of the leg pad 21.

[0094] like Figure 4D As shown, the bolts 25 are countersunk screws, which fix the top pad 22, the plywood layer 3 and the leg pad 21, and fix the top pad 22, the plywood layer 3 and the leg pad 21 as a whole on the tank bottom plate 1.

[0095] like Figure 4EAs shown, an annular cover 23 is installed at the step formed by the top pad 22 and the leg pad 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 21, and the lower end of the annular cover 23 can be sealed and connected with 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 pad 22. After the lower end of the annular cover 23 is fixedly sealed and connected with the bottom plate 1, the upper end surface of the top pad 22 is parallel to the upper end of the annular cover 23, so that the top pad 22 and the top of the annular cover 23 are adapted.

[0096] A connecting hole 231 is provided on the annular cover 23 , and the lower side of the connecting hole 231 is connected to the blind hole region of the plywood 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 pad 22 , and then the connecting hole 231 of the annular cover 23 is inflated to ensure that the connecting hole 231 is connected with the blind hole of the internal plywood layer 3 .

[0098] like Figure 4F and Figure 5 As shown, a third polypropylene sandwich panel 24 with blind holes is laid on top of the annular cover 23, and the blind holes of the third sandwich panel 24 are connected to the upper side of the connecting hole 231 of the annular cover 23. A top sealing layer 4 is laid on top of the third sandwich panel 24 to seal the entire structure.

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

[0100] The obstacle (equipment leg) is welded to the top pad 22, and then the top pad 22 and the annular cover 23 (except the connecting hole 231) are completely covered with epoxy resin by brushing, thereby ensuring that the top pad 22 does not directly contact the storage medium in the tank and ensuring that the joint between the top pad 22 and the annular cover 23 is sealed.

[0101] In a specific embodiment, the substrate layer 2 in the first embodiment is laid on the bottom plate 1 at a position where the leg pad 21 is not provided. The annular cover 23 is bonded to the substrate layer 2 on the bottom surface with epoxy resin to ensure structural fixation and sealing. A through connection hole 231 is provided on the annular cover 23 to connect the sandwich layer 3 and the third sandwich plate 24.

[0102] In this embodiment, a hole is opened on the top sealing layer 4 for connecting with a leakage detection mechanism, so that the leakage detection mechanism can monitor the vacuum degree in the third sandwich panel 24 and the sandwich panel layer 3 in real time and detect leakage in time.

[0103] The double-layer structural member 100 provided in this embodiment can be used to transform obstacles on the bottom plate 1. When obstacles are installed on the bottom plate 1, the double-layer structure can be maintained there, thereby realizing leakage monitoring of the bottom plate 1 at the obstacle.

[0104] Embodiment 4:

[0105] Processing of bottom plate 1:

[0106] For in-service tanks, clean and ventilate the tanks, inspect the tanks, and evaluate their uneven settlement, especially the uneven settlement of the lower part of the bottom plate 1. If the bottom plate 1 has too much foundation settlement, when the tank is full of oil, the bottom plate 1 will bend excessively, which may cause the double-layer structure to bend and tear or micro cracks in the lining. For areas with excessive foundation settlement, small holes are opened in the bottom plate 1 of the tank, and epoxy putty is injected for patina, and then the small holes are repaired with epoxy fiberglass material.

[0107] Check the thickness of the bottom plate 1 to ensure that it is above 1.25 mm. If necessary, use magnetic flux leakage scanning (MFL) to scan and inspect the bottom plate 1. If the bottom plate 1 is corroded over a large area, patch the steel plate on the original bottom plate 1 or replace it with a new one.

[0108] Sandblasting is performed on the bottom plate 1 and the area below 0.6 meters of the tank wall to remove rust, with a rust removal level of Sa2.5. If there are convex or weld overlap areas on the bottom plate 1, if there are edges, corners, barbs, etc., they should be polished according to the situation to avoid piercing the lining due to deformation under force.

[0109] The corrosion pits, perforations and cracks on the bottom plate 1 are repaired according to the hole conditions. After repair, the surface of the entire bottom plate 1 is flat. The large angle welds of the tank bottom plate 1, the bottom plate welds, the support plates at the bottom of the floating plate legs, the rivets, and the bottom plate 1 equipment support legs are repaired and sealed with metal repair agent, and then epoxy putty is used for transition treatment.

[0110] Process the common area of ​​base plate 1:

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

[0112] After the substrate layer 2 is completely cured, the plywood layer 3 is laid, and then the top sealing layer 4 is sprayed.

[0113] Separation area implementation method:

[0114] A polypropylene board with a blind hole array is used as the sandwich layer 3. At the separation of the double-layer structure, after the substrate layer 2 is coated, Figure 1 and Figure 2First, install the first sandwich panel 31, and then use the separation sealing layer 5 to bond with the substrate layer 2, and seal one side of the first sandwich panel 31. Then lay the second sandwich panel 32 on the other side, and lay the second sandwich panel 32 along the slope to the top of the separation sealing layer 5, and then bond with the separation sealing layer 5 through the top sealing layer 4.

[0115] Implementation methods at obstacles:

[0116] like Figure 3 to Figure 6B As shown, if the obstacle (such as the equipment leg) has been welded to the original base plate 1, the obstacle should be separated from the original base plate 1 by cutting or other means, and the original obstacle and the welding part should be polished. After that, the leg pad 21 is welded to the original equipment leg of the base plate 1, and the pin blind hole is punched and tapped on the leg pad 21. The plywood layer 3 is laid on the processed leg pad 21, and the pin through hole is punched at the corresponding position on the plywood layer 3.

[0117] The top pad 22 is laid on the plywood layer 3, and the top pad 22 should be sandblasted and rust-free in advance. At the corresponding position, the top pad 22 is punched with pin holes and tapped, and then the top pad 22, the plywood layer 3 and the leg pad 21 are fixed with countersunk screws, and fixed as a whole on the tank bottom plate 1. Afterwards, the above parts are polished, and the edges and sharp protrusions are polished to avoid damage.

[0118] An annular cover 23 is installed at the step formed by the top pad 22 and the leg pad 21, and the upper and lower planes of the annular cover 23 are bonded to the original bottom plate 1 and the top pad 22 respectively using epoxy resin. The annular cover 23 is provided with a connecting hole 231, and the lower side of the connecting hole 231 is connected to the blind hole area of ​​the plywood layer 3. Then, the connecting hole 231 of the annular cover 23 is inflated to ensure that the connecting hole 231 is connected to the blind hole of the internal plywood layer 3.

[0119] Afterwards, a third sandwich plate 24 is laid on the annular cover 23, wherein the blind hole of the third sandwich plate 24 is connected with the connecting hole 231 on the annular cover 23, and a top sealing layer 4 is laid on the third sandwich plate 24, thereby sealing the entire structure. At this point, the double-layer structure at the obstacle is completed.

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

[0121] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0122] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0123] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0124] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-layer structural member, characterized in that: include: Bottom plate (1); A substrate layer (2) arranged on the upper surface of the base plate (1); A sandwich layer (3) arranged on the upper surface of the substrate layer (2), wherein a plurality of blind holes are arranged on the sandwich layer (3); And a top sealing layer (4) arranged on the upper surface of the plywood layer (3).

2. The double-layer structural member according to claim 1, characterized in that: The sandwich layer (3) comprises a plurality of sandwich panels arranged in sequence along the upper surface of the substrate layer (2), and a separation sealing layer (5) is arranged between two adjacent sandwich panels.

3. The double-layer structural member according to claim 2, characterized in that: The side surface of the sandwich panel is arranged 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 side surfaces of the separation sealing layer (5) are respectively sealed to the side surfaces of two adjacent sandwich panels.

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

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

6. The double-layer structural member according to claim 5, characterized in that: The top sealing layer (4) comprises a plurality of sealing plates arranged in sequence along the upper surface of the sandwich layer (3), and one end of the sealing plate is integrally formed with the separation sealing layer (5).

7. The double-layer structure according to any one of claims 1 to 4, characterized in that: The double-layer structural member also includes a leakage monitoring mechanism for detecting the vacuum degree of the sandwich layer (3).

8. The double-layer structural member according to claim 1, characterized in that: A substrate layer (2), a sandwich layer (3), a top pad (22), an annular cover (23), a third sandwich plate (24) and a top sealing layer (4) are arranged in sequence above the bottom plate (1); through holes are arranged in the vertical direction on the annular cover (23), the third sandwich plate (24) and the top sealing layer (4); obstacles are fixed on the top pad (22) through the through holes.

9. The double-layer structural member according to claim 8, characterized in that: The substrate layer (2) comprises a leg pad (21), and the leg pad (21), the sandwich layer (3) and the top pad (22) are fixedly connected by bolts.

10. The double-layer structural member according to claim 9, characterized in that: The sizes of the plywood layer (3) and the top pad (22) are smaller than the sizes 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 sealed to the bottom plate (1); and the upper part of the annular cover (23) is sealed to the top of the top pad (22).

11. The double-layer structural member according to claim 10, characterized in that: A plurality of connection holes (231) are provided on the annular cover (23), and one end of the connection hole (231) is connected to the plywood layer (3).

12. The double-layer structural member according to claim 11, characterized in that: The annular cover (23) and the top sealing layer (4) are configured to be conical, and one end of the connecting hole (231) away from the sandwich layer (3) is connected to the third sandwich plate (24).

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