Low-temperature storage tank inner tank wall plate vertical joint butt joint structure

Abstract

The application discloses a vertical joint butt joint structure of an inner tank wall plate of a low-temperature storage tank, and relates to the technical field of inner tank construction of LNG storage tanks. The vertical joint butt joint structure of the inner tank wall plate of the low-temperature storage tank comprises a prestress applying system and a back support device. The prestress applying system extends in the vertical direction. Part of the prestress applying system is abuttingly arranged on one side of the inner tank wall plate facing the inner tank lining plate. Another part of the prestress applying system is abuttingly arranged on the side of the inner tank wall plate away from the inner tank lining plate. The prestress applying system is used for applying prestress acting on the vertical joint area to the inner tank wall plate. The back support device extends in the vertical direction. The back support device is arranged in the horizontal direction and is spaced apart from the prestress applying system. The top end of the back support device is clamped to the top edge of the inner tank wall plate. The bottom end of the back support device is detachably connected to the side of the inner tank wall plate facing the inner tank lining plate. The application can reduce space occupation, simplify the operation process and improve the vertical joint welding deformation control capability.

Description

Technical Field

[0001] This invention relates to the field of LNG storage tank inner tank construction technology, and in particular to a vertical joint connection structure for the inner tank wall panels of a cryogenic storage tank. Background Technology

[0002] In recent years, the global energy structure transformation has driven the continuous growth in demand for clean energy. As an important carrier of clean energy, liquefied natural gas (LNG) has seen rapid development in its storage and transportation technologies. Large-scale full-containment LNG storage tanks, as a key infrastructure in the industrial chain, have been continuously expanded in scale, with storage capacity increasing from tens of thousands of cubic meters in the early days to over 200,000 cubic meters.

[0003] In the construction of the inner tank wall panels, the welding quality control of the vertical joints, i.e., the longitudinal butt welds, is directly related to the structural integrity, operational safety, and construction period of the tank. Current construction methods generally adopt the method of sectional hoisting followed by on-site assembly and welding. In order to control the welding deformation of the vertical joints, the traditional technique is to arrange a support frame on the welding side of the wall panel, i.e., the side away from the inner tank liner, and use rigid components such as steel pipes and structural steel for fixing and restraint.

[0004] However, this support frame has significant shortcomings: First, the large-area layout of the frame on the welding side of the wall panel severely encroaches on the already limited construction space inside the inner tank, making it difficult to carry out multi-process cross-operations and significantly restricting the improvement of construction efficiency; Second, the installation and dismantling process of the support frame is extremely cumbersome, requiring operators to work frequently on the narrow, high-altitude temporary construction platform inside the inner tank, which not only greatly extends the construction period but also increases the safety risks of personnel falling and colliding due to space constraints and frequent operations; Third, the traditional support method only provides rigid constraints on one side, which cannot form an effective prestress distribution on both sides of the wall panel, making it difficult to actively counteract the deformation trend caused by welding thermal cycles, resulting in unsatisfactory welding deformation control, affecting weld quality and the overall performance of the storage tank. Summary of the Invention

[0005] The main objective of this invention is to propose a vertical seam connection structure for the inner wall panels of a cryogenic storage tank, aiming to provide a vertical seam connection structure that can reduce space occupation, simplify operation procedures, and improve the ability to control vertical seam welding deformation.

[0006] To achieve the above objectives, the present invention proposes a vertical seam butt joint structure for the inner wall panel of a cryogenic storage tank. The inner wall panel is a plate to be welded, and a vertical seam to be welded is provided between two adjacent inner wall panels. A space for insulating filler is formed between the inner wall panel and the inner lining of the cryogenic storage tank. The vertical seam butt joint structure for the inner wall panel of the cryogenic storage tank includes:

[0007] A prestressing application system extends vertically, a portion of which is abutted against the side of the inner tank wall plate facing the inner tank liner, and another portion of which is abutted against the side of the inner tank wall plate away from the inner tank liner. The prestressing application system is used to apply prestress to the inner tank wall plate acting on the vertical joint area. A back support device extends vertically and is spaced horizontally from the prestressing application system. The top end of the back support device is clamped to the top edge of the inner tank wall plate, and the bottom end of the back support device is detachably connected to the side of the inner tank wall plate facing the inner tank liner.

[0008] In one embodiment, the prestressing system includes a constant force support assembly, a mounting bracket, a prestressing mechanism, and a first adsorption assembly. The constant force support assembly extends vertically and abuts against the side of the inner tank wall facing away from the inner tank liner. The constant force support assembly is located near the vertical seam. The mounting bracket extends vertically and is positioned within the insulation filler space corresponding to the position of the constant force support assembly. The top end of the mounting bracket is connected to the top end of the constant force support assembly. The prestressing mechanism is located on the side of the mounting bracket facing the inner tank wall and is radially extendable and retractable along the cryogenic storage tank. The prestressing mechanism abuts against the side of the inner tank wall facing the inner tank liner. The first adsorption assembly is located at the bottom end of the mounting bracket and is used to adsorb or detach from the bottom area of ​​the inner tank wall facing the inner tank liner.

[0009] In one embodiment, the prestressing mechanism includes a flexible extrusion plate and a plurality of prestressing components. The plurality of prestressing components are vertically spaced on the side of the mounting frame facing the inner tank wall. Each of the plurality of prestressing components is radially extendable and retractable along the cryogenic storage tank. The flexible extrusion plate extends vertically and is disposed between the plurality of prestressing components and the inner tank wall. The plurality of prestressing components are used to press the flexible extrusion plate against the side of the inner tank wall facing the inner tank liner.

[0010] In one embodiment, the prestressing application assembly includes an inner tube, an outer tube, and a constant force spring. The inner tube is mounted on the mounting bracket, and the outer tube is slidably sleeved on the inner tube along the radial direction of the cryogenic storage tank. One end of the outer tube is connected to the flexible extrusion plate, and the constant force spring is disposed between the flexible extrusion plate and the inner tube. The constant force spring is used to press the flexible extrusion plate against the side of the inner tank wall facing the inner tank liner.

[0011] In one embodiment, the constant force support assembly includes a rigid support plate, a connecting plate, and a counterweight. The rigid support plate extends vertically, and its bottom end is connected to the counterweight. The rigid support plate abuts against the inner tank wall on the side opposite to the inner tank liner. The top end of the rigid support plate is bent radially outward from the cryogenic storage tank to form a connecting section. The connecting plate is connected to the connecting section. The connecting plate has multiple connecting holes, all of which extend radially from the cryogenic storage tank and are spaced horizontally. The mounting bracket includes a mounting frame body that extends vertically. The top of the mounting frame body has a connecting port, which can be selectively connected to any of the connecting holes via a connector.

[0012] In one embodiment, the first adsorption assembly includes a first suction nozzle, a first mounting tube, and a first air piping. The first suction nozzle extends radially along the cryogenic storage tank. The first mounting tube is mounted at the bottom end of the mounting bracket. A first adsorption pad of the first suction nozzle is mounted at one end of the first mounting tube. The first adsorption pad is disposed in the bottom region of the inner tank wall panel. A first adsorption space is formed between the first adsorption pad and the side of the inner tank wall panel facing the inner tank liner. One end of the first air piping communicates with the first adsorption space through the other end of the first mounting tube. The other end of the first air piping communicates with an external air supply mechanism. The first air piping is used to draw or supply air to the first adsorption space, correspondingly causing the first adsorption pad to adsorb or detach from the bottom region of the inner tank wall panel facing the inner tank liner.

[0013] In one embodiment, the back support device includes a clamping structure, a second adsorption component, and a rigid connecting rod. The clamping structure is disposed near the vertical seam and is detachably clamped vertically to the top edge of the inner tank wall plate. The second adsorption component is disposed near the vertical seam, within the cold insulation filler filling space, and in the bottom region of the inner tank wall plate. The second adsorption component is used to adsorb or detach from the side of the inner tank wall plate facing the inner tank liner. The rigid connecting rod extends vertically, is disposed within the cold insulation filler filling space, has its bottom end connected to the second adsorption component, and its top end connected to the clamping structure.

[0014] In one embodiment, the clamping structure includes a mounting base and a clamping plate. The mounting base is disposed on the side of the inner tank wall plate away from the inner tank liner, and the clamping plate is disposed on the side of the inner tank wall plate facing the inner tank liner. The clamping plate can slide along the radial direction of the cryogenic storage tank between a clamping position close to or far from the mounting base and a release position, thereby clamping or releasing the inner tank wall plate accordingly.

[0015] In one embodiment, the mounting base includes an end plate, a mounting plate, and a bolt. The mounting plate extends radially along the cryogenic storage tank. One end of the mounting plate extends out of the inner tank wall plate away from the inner tank liner and forms a mounting end. The other end of the mounting plate extends out of the inner tank wall plate towards the inner tank liner and forms a connecting end. The top end of the rigid connecting rod is connected to the connecting end. The mounting plate extends vertically and is connected to the mounting end. The mounting plate and the mounting plate form a T-shaped structure. An assembly opening is provided on the mounting plate, extending radially along the cryogenic storage tank. A clamping plate extends vertically, with its top end extending out of the top of the assembly opening and forming a connecting portion. The bolt extends radially along the cryogenic storage tank. One end of the bolt extends threadedly to the mounting plate, and the other end extends rotatably to the connecting portion. The bolt is used to drive the clamping plate to slide between the clamping position and the release position via the connecting portion.

[0016] In one embodiment, the second adsorption assembly includes a second suction nozzle, a limiting seat, and a second air pipe. The second suction nozzle extends radially along the cryogenic storage tank. A second mounting tube of the second suction nozzle is installed on the limiting seat. The bottom end of the rigid connecting rod is connected to the limiting seat. A second adsorption pad of the second suction nozzle is installed at one end of the second mounting tube. The second adsorption pad is disposed in the bottom area of ​​the inner tank wall plate. A second adsorption space is formed between the second adsorption pad and the side of the inner tank wall plate facing the inner tank liner. One end of the second air pipe communicates with the second adsorption space through the other end of the second mounting tube. The other end of the second air pipe communicates with an external air configuration mechanism. The second air pipe is used to draw or supply air to the second adsorption space, correspondingly causing the second adsorption pad to adsorb or detach from the side of the inner tank wall plate facing the inner tank liner.

[0017] The technical solution of the present invention applies prestress to both sides of the wall panel through a prestressing application system and a back support device and achieves detachable connection, effectively offsetting welding thermal deformation, reducing construction space occupation, simplifying operation process, and improving welding deformation control capability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an embodiment of the vertical joint connection structure of the inner wall plate of a cryogenic storage tank provided by the present invention. Figure 2 A schematic diagram of another embodiment of the vertical joint connection structure of the inner wall plate of the cryogenic storage tank provided by the present invention; Figure 3 A schematic diagram of another embodiment of the vertical joint connection structure of the inner wall plate of the cryogenic storage tank provided by the present invention. Figure 4 A schematic diagram of another embodiment of the vertical joint connection structure of the inner wall plate of the cryogenic storage tank provided by the present invention. Figure 5 This is a schematic diagram of a structure of an embodiment of the prestressing application system involved in the present invention; Figure 6 This is a schematic diagram of another embodiment of the prestressing application system involved in the present invention; Figure 7 This is a schematic diagram of an embodiment of the back support device involved in the present invention.

[0020] Explanation of icon numbers: 10. Inner tank wall panel; 20. Space for cold insulation filler; 100. Constant force support assembly; 200. Mounting bracket; 300. Prestress application mechanism; 400. First adsorption assembly; 110. Rigid support plate; 120. Connecting plate; 130. Counterweight; 101. Connecting hole; 310. Flexible extrusion plate; 320. Prestress application assembly; 321. Inner tube; 322. Outer tube; 410. First suction nozzle; 420. First air piping; 411. First adsorption pad; 412. First mounting tube; 1000 Clamping structure; 2000 Second adsorption assembly; 3000 Rigid connecting rod; 1100 Mounting base; 1200 Clamping plate; 1110 End plate; 1120 Mounting plate; 1130 Bolt; 2100 Second suction nozzle; 2200 Limiting seat; 2300 Second air piping; 2110 Second adsorption pad; 2120 Second mounting tube.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] Existing technologies for controlling welding deformation at vertical seams of inner tank walls in cryogenic storage tanks typically involve arranging large-area rigid support frames on the welding side of the wall panels. This significantly encroaches on the internal construction space of the inner tank, restricts multi-process cross-operations, and reduces construction efficiency. Furthermore, the installation and dismantling of this support structure is cumbersome, prolonging the construction period and increasing personnel safety risks. In addition, unilateral rigid constraints are insufficient to effectively counteract welding thermal deformation, resulting in unsatisfactory welding deformation control.

[0026] To address this technical problem, this invention proposes a vertical joint connection structure for the inner wall panels of a cryogenic storage tank.

[0027] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4In one embodiment of the present invention, the inner tank wall panel 10 of the cryogenic storage tank is an inner tank wall panel 10 to be welded. A vertical seam to be welded is provided between two adjacent inner tank wall panels 10. A cold insulation filler filling space 20 is formed between the inner tank wall panel 10 and the inner tank liner of the cryogenic storage tank. The vertical seam connection structure of the inner tank wall panel 10 of the cryogenic storage tank includes a prestressing system and a back support device. The prestressing system extends vertically. A part of the prestressing system is pressed against the side of the inner tank wall panel 10 facing the inner tank liner, and another part of the prestressing system is pressed against the side of the inner tank wall panel 10 away from the inner tank liner. The prestressing system is used to apply prestress to the inner tank wall panel 10 acting on the vertical seam area. The back support device extends vertically. The back support device and the prestressing system are spaced apart in the horizontal direction. The top end of the back support device is clamped to the top edge of the inner tank wall panel 10, and the bottom end of the back support device is detachably connected to the side of the inner tank wall panel 10 facing the inner tank liner.

[0028] For ease of understanding, the following explains some key terms in this embodiment: The inner tank wall plate 10 of a cryogenic storage tank refers to the metal plate that constitutes the main structure of the inner tank. It is usually made of a material with good low-temperature toughness and is used to store cryogenic media such as liquefied natural gas. During the construction of the storage tank, multiple inner tank wall plates 10 are welded together to form a complete inner tank structure.

[0029] The vertical joint refers to the butt weld formed vertically between two adjacent inner tank wall panels 10. The welding quality of this vertical joint directly affects the structural integrity and sealing performance of the inner tank, and controlling its welding deformation is a key aspect of the construction process.

[0030] The cold insulation filler space 20 refers to the annular or interlayer space between the inner tank wall plate 10 and the outer tank or inner tank liner of the cryogenic storage tank, which is used to fill cold insulation materials (such as perlite, glass wool, etc.). This space plays a role in heat insulation during the operation of the storage tank to maintain the low temperature environment of the inner tank.

[0031] A prestressing application system refers to a device used to apply prestress to the inner tank wall panel 10. This prestress is typically applied to the vertical seam area to counteract deformation caused by welding heat input, thereby controlling the weld formation quality and the overall flatness of the wall panel. The system achieves prestressing by applying radial forces to both sides of the wall panel.

[0032] A back support device is an auxiliary device used to provide support and positioning during the welding process of the inner tank wall panel 10. This device is typically installed vertically, with its top end clamping the top edge of the wall panel and its bottom end connecting to the bottom area of ​​the wall panel to provide stable support and constraint for the wall panel during welding.

[0033] This embodiment provides a vertical seam connection structure for the inner tank wall panel 10 of a cryogenic storage tank, which is applied in the construction process of the cryogenic storage tank. This structure is designed for the inner tank wall panel 10 to be welded, wherein a vertical seam is formed between two adjacent inner tank wall panels 10. This vertical seam is a critical part connecting the wall panels, and its welding quality directly affects the overall performance of the storage tank. Simultaneously, a cold-insulating filler space 20 is formed between the inner tank wall panel 10 and the inner tank liner of the cryogenic storage tank. This space is used to fill cold-insulating material in the final operating state of the storage tank, but during the construction phase, this space can be used to arrange auxiliary equipment, thereby avoiding occupying the construction area inside the inner tank.

[0034] To effectively control deformation during vertical seam welding, this embodiment includes a prestressing application system. This system extends vertically, with one portion positioned against the side of the inner tank wall panel 10 facing the inner tank liner, and the other portion against the side of the inner tank wall panel 10 away from the inner tank liner. This system actively counteracts the deformation tendency caused by welding heat input by applying radial prestress to both sides of the wall panel. For example, the prestressing application system can consist of a series of hydraulic or pneumatic cylinders, fixed by supports and acting on both sides of the wall panel. In another implementation, the system can employ a mechanical screw mechanism, where rotating the screw pushes or pulls the contact element to apply prestress to the wall panel.

[0035] In addition, this embodiment also includes a back support device. This back support device also extends vertically and is spaced horizontally from the prestressing application system. The top end of the back support device is configured to clamp the top edge of the inner tank wall panel 10 to provide upper positioning and support. The bottom end of the back support device is detachably connected to the side of the inner tank wall panel 10 facing the inner tank liner, for example, by magnetic adsorption, vacuum suction cups, or simple mechanical clips. The function of the back support device is to provide stable external support for the inner tank wall panel 10 during welding, preventing undesirable displacement or deformation of the wall panel under the heat of welding. For example, the back support device may consist of one or more retractable support rods, the top end of which clamps the wall panel by a manual or electric clamp, and the bottom end is fixed to the inside of the wall panel by a suction cup or bolts 1130.

[0036] The vertical joint connection structure of the inner tank wall panel 10 in this embodiment achieves bidirectional prestress constraint and stable support for the vertical joint area of ​​the inner tank wall panel 10 by arranging a prestressing application system and a back support device within the insulation filler space 20 between the inner tank wall panel 10 and the inner tank liner. This effectively avoids the problem of traditional support structures occupying internal construction space within the inner tank, significantly improving the convenience of multi-process cross-operations. Simultaneously, this structure simplifies the installation and dismantling process, reduces the safety risks of high-altitude operations, and improves overall construction efficiency. By actively applying prestress, this structure can more effectively offset welding thermal deformation, thereby ensuring the welding quality of the vertical joint and the overall flatness of the inner tank.

[0037] Please continue reading. Figures 1 to 4 And see Figure 5 and Figure 6 In an embodiment of the present invention, the prestressing application system includes a constant force support assembly 100, a mounting bracket 200, a prestressing application mechanism 300, and a first adsorption assembly 400. The constant force support assembly 100 extends vertically and abuts against the side of the inner tank wall plate 10 away from the inner tank liner. The constant force support assembly 100 is positioned close to the vertical seam. The mounting bracket 200 extends vertically and is positioned within the cold insulation filler filling space 20 corresponding to the position of the constant force support assembly 100. The top of the mounting bracket 200 is connected to the top of the constant force support assembly 100; the prestressing mechanism 300 is disposed on the side of the mounting bracket 200 facing the inner tank wall plate 10, and the prestressing mechanism 300 can extend and retract radially along the cryogenic storage tank. The prestressing mechanism 300 is used to press against the side of the inner tank wall plate 10 facing the inner tank liner; the first adsorption assembly 400 is disposed at the bottom end of the mounting bracket 200, and the first adsorption assembly 400 is used to adsorb or detach from the bottom area of ​​the inner tank wall plate 10 facing the inner tank liner.

[0038] The prestressing application system includes a constant force support assembly 100, a mounting bracket 200, a prestressing application mechanism 300, and a first adsorption assembly 400. The constant force support assembly 100 extends vertically, abutting against the side of the inner tank wall plate 10 away from the inner tank liner, and is positioned near the vertical seam. The main function of this constant force support assembly 100 is to provide a stable external reaction force support point, ensuring that the prestressing application mechanism 300 can obtain reliable support when applying prestress to the inner tank wall plate 10, thereby guaranteeing the stability and uniformity of prestressing application. Its abutting against the side of the inner tank wall plate 10 away from the inner tank liner and its positioning near the vertical seam allows the applied prestress to act more directly and effectively on the welding area. In specific implementations, the constant force support assembly 100 can be constructed from profiles or plates with sufficient rigidity and strength, such as I-beams, channel steel, or thick steel plates. Its bottom can be fixed to the ground or the external structure of the tank, or stability can be provided by counterweights 130.

[0039] The mounting bracket 200 extends vertically and is positioned within the insulation filler filling space 20, corresponding to the position of the constant force support component 100. Its top end connects to the top end of the constant force support component 100. The function of the mounting bracket 200 is to construct an internal support frame within the insulation filler filling space 20 for installing and positioning the prestressing application mechanism 300 and the first adsorption component 400. The mounting bracket 200 is positioned corresponding to the constant force support component 100, and its top end connects to the top end of the constant force support component 100, forming an internally and externally linked support system. This ensures that when the prestressing application mechanism 300 applies force internally, the force can be transmitted to the external constant force support component 100 through the mounting bracket 200, thus forming a stable mechanical closed loop. The mounting bracket 200 can be constructed from lightweight, high-strength metal profiles (such as aluminum alloy or stainless steel) by welding or bolting 1130, facilitating installation and disassembly in confined spaces.

[0040] The prestressing application mechanism 300 is located on the side of the mounting bracket 200 facing the inner tank wall plate 10. It is radially extendable and retractable along the cryogenic storage tank to abut against the side of the inner tank wall plate 10 facing the inner tank liner. This mechanism is the actuating unit that directly applies prestress to the inner tank wall plate 10. Its design allows for radial extension and retraction along the cryogenic storage tank, meaning it can adjust the magnitude and position of the applied force according to actual needs to accurately abut against the side of the inner tank wall plate 10 facing the inner tank liner. This extensibility allows for adaptive adjustments to wall plates of different thicknesses or slight deformations, ensuring uniform distribution of prestress. The mechanism can take various forms, such as a push rod driven by a hydraulic cylinder, pneumatic cylinder, or mechanical screw, or a set of adjustable spring assemblies, to achieve radial extension and retraction and force application.

[0041] The first adsorption component 400 is disposed at the bottom end of the mounting bracket 200 and is used to adsorb or detach the bottom area of ​​the inner tank wall plate 10 facing the inner tank liner. The function of this component is to temporarily or continuously adsorb and fix the bottom area of ​​the mounting bracket 200 to the side of the inner tank wall plate 10 facing the inner tank liner during the application of prestress. This helps prevent displacement or shaking of the mounting bracket 200 during the application of prestress, thereby improving the stability, positioning accuracy, and operational safety of the entire prestress application system. The first adsorption component 400 can be implemented using a vacuum chuck, an electromagnetic chuck, or a rubber pad with a high coefficient of friction combined with a mechanical clamping mechanism, and the adsorption or detachment operation is performed through an external control system.

[0042] By employing the aforementioned technical solution, the prestressing application system is refined into a combination of a constant force support component 100, a mounting bracket 200, a prestressing application mechanism 300, and a first adsorption component 400, which significantly improves the stability and accuracy of prestressing application. Specifically, the constant force support component 100 provides robust external reaction force support, while the mounting bracket 200 constructs a stable operating platform internally; the two are connected at their tops to form a robust whole. The prestressing application mechanism 300 can extend and retract radially, allowing the prestress to be accurately adjusted according to actual needs, ensuring that the prestress applied to the inner tank wall plate 10 is uniform and controllable, effectively offsetting deformation generated during welding. Simultaneously, the first adsorption component 400 provides reliable adsorption and fixation at the bottom of the mounting bracket 200, further enhancing the positioning accuracy and operational stability of the entire system, avoiding potential system shaking or displacement during prestressing application. This structured design makes the prestressing application process more efficient and reliable, thereby ensuring the quality of the vertical seam welding of the inner tank wall plate 10 of the cryogenic storage tank, reducing rework caused by welding deformation, and improving construction efficiency and safety.

[0043] Please continue reading. Figure 5 and Figure 6 In an embodiment of the present invention, the prestressing application mechanism 300 includes a flexible extrusion plate 310 and a plurality of prestressing application components 320. The plurality of prestressing application components 320 are vertically spaced on the side of the mounting frame facing the inner tank wall plate 10. The plurality of prestressing application components 320 can all extend and retract radially along the cryogenic storage tank. The flexible extrusion plate 310 extends vertically and is disposed between the plurality of prestressing application components 320 and the inner tank wall plate 10. The plurality of prestressing application components 320 are used to press the flexible extrusion plate 310 against the side of the inner tank wall plate 10 facing the inner tank liner.

[0044] Specifically, the flexible extrusion plate 310 extends vertically and can be made of materials with a certain elastic modulus and flexibility, such as high-strength rubber, polymer composite materials, or thin-walled metal plates. This flexible extrusion plate 310 is positioned between the multiple prestressing application components 320 and the inner tank wall plate 10. Its main function is to evenly distribute the discrete point or line pressure applied by the multiple prestressing application components 320 onto a larger area of ​​the inner tank wall plate 10 facing the inner tank liner. Through the deformation characteristics of the flexible extrusion plate 310, it can effectively compensate for any minor unevenness that may exist on the surface of the inner tank wall plate 10, ensuring the continuity and uniformity of prestressing application and avoiding localized stress concentration.

[0045] Multiple prestressing components 320 are vertically spaced on the side of the mounting frame facing the inner tank wall 10. These components are all capable of radial expansion and contraction along the cryogenic storage tank to press against the flexible extrusion plate 310. The use of multiple prestressing components 320, rather than a single large component, aims to achieve accurate, segmented prestress control of the inner tank wall 10 vertically. Each prestressing component 320 can be adjusted independently or collaboratively, thereby applying accurate and controllable prestress according to the actual needs at different height positions of the inner tank wall 10. For example, its radial expansion and contraction function can be achieved through various means such as hydraulic cylinders, pneumatic cylinders, screw mechanisms, or spring mechanisms. Through their radial expansion and contraction, the multiple prestressing components 320 tightly press the flexible extrusion plate 310 against the side of the inner tank wall 10 facing the inner tank liner. This pressing action allows the flexible extrusion plate 310 to act as a force transmission medium, uniformly transmitting prestress to the vertical joint area of ​​the inner tank wall 10.

[0046] Through the above technical solution, the prestressing application mechanism 300 no longer applies force in a single or localized manner, but rather multiple prestressing application components 320 work synergistically on the flexible extrusion plate 310, which then uniformly transmits the force to the inner tank wall plate 10. This design significantly improves the uniformity of prestress distribution in the vertical seam area of ​​the inner tank wall plate 10, avoiding localized stress concentration and unintended deformation of the inner tank wall plate 10. The flexible extrusion plate 310 can adapt to minor unevenness on the surface of the inner tank wall plate 10, ensuring the continuity and effectiveness of prestress application. The vertically spaced arrangement of multiple prestressing application components 320 allows for accurate control and uniform application of prestress along the entire height range of the vertical seam, thereby providing a stable stress environment for vertical seam welding, effectively suppressing deformation caused by welding stress, improving welding quality and efficiency, and ultimately ensuring the structural integrity and long-term operational safety of the cryogenic storage tank inner tank wall plate 10.

[0047] Please continue reading. Figure 5 and Figure 6 In an embodiment of the present invention, the prestressing application component 320 includes an inner tube 321, an outer tube 322, and a constant force spring. The inner tube 321 is mounted on the mounting bracket 200. The outer tube 322 is slidably sleeved on the inner tube 321 along the radial direction of the cryogenic storage tank. One end of the outer tube 322 is connected to the flexible extrusion plate 310. The constant force spring is disposed between the flexible extrusion plate 310 and the inner tube 321. The constant force spring is used to press the flexible extrusion plate 310 against the side of the inner tank wall plate 10 facing the inner tank liner.

[0048] The characteristic of a constant force spring is that it can output a basically constant force within a certain stroke range, which is crucial for ensuring the uniformity and stability of the prestress application.

[0049] Specifically, the inner tube 321 is typically securely fixed to the mounting bracket 200 via bolts 1130, welding, or other mechanical connections, providing a stable mounting reference. The sliding fit between the outer tube 322 and the inner tube 321 can be precision machined, and guide sleeves or lubrication structures can be provided as needed to reduce frictional resistance and ensure smoothness and accuracy during the expansion and contraction process. The connection between the outer tube 322 and the flexible extrusion plate 310 can be achieved through welding, bolt 1130 connection, or pin connection to ensure reliable force transmission. The selection of the constant force spring requires accurate calculation based on the required prestress and working stroke. One end of the spring can be fixed or rest against the inner tube 321, and the other end can be fixed or rest against the flexible extrusion plate 310. Thus, when the prestress application component 320 is compressed, the constant force spring can generate an outward thrust, which acts on the inner tank wall plate 10 through the outer tube 322 and the flexible extrusion plate 310.

[0050] Through the above technical solution, the prestressing application component 320 utilizes the sliding fit of the inner tube 321 and the outer tube 322, along with the constant force output characteristic of the constant force spring, to achieve stable, continuous, and uniform clamping of the inner tank wall plate 10. The constant force spring can automatically compensate for slight unevenness on the surface of the inner tank wall plate 10 or minor thermal deformation generated during welding, ensuring that the flexible extrusion plate 310 always acts on the vertical seam area of ​​the inner tank wall plate 10 with a preset constant force. This effectively solves the problem that traditional force application methods cannot guarantee the uniformity and stability of prestress, avoids local stress concentration or insufficiency, thereby significantly improving the quality of vertical seam welding and reducing welding deformation and defects. In addition, the introduction of the constant force spring simplifies the prestress adjustment process, reduces the skill requirements of operators, and improves construction efficiency and overall reliability.

[0051] Please continue reading. Figure 5 and Figure 6 In an embodiment of the present invention, the constant force support assembly 100 includes a rigid support plate 110, a connecting plate 120, and a counterweight 130. The rigid support plate 110 extends vertically, and its bottom end is connected to the counterweight 130. The rigid support plate 110 abuts against the side of the inner tank wall plate 10 away from the inner tank liner. The top end of the rigid support plate 110 is bent radially outward from the cryogenic storage tank to form a connecting section. The connecting plate 120 is connected to the connecting section. The connecting plate 120 has a plurality of connecting holes 101, which extend radially from the cryogenic storage tank and are spaced apart horizontally. The mounting bracket 200 includes a mounting bracket body that extends vertically. The top of the mounting bracket body has a connecting port, which can be selectively connected to any connecting hole 101 via a connector.

[0052] The constant force support assembly 100 primarily provides stable support on the side of the inner tank wall plate 10 facing away from the inner tank liner, balancing the radial force applied to the inner tank wall plate 10 by the prestressing application mechanism 300 and ensuring the effectiveness and stability of prestressing application. The rigid support plate 110, as the main structure of the constant force support assembly 100, extends vertically and possesses sufficient strength and rigidity to withstand and transmit the radial reaction force from the inner tank wall plate 10. Its bottom end connects to the counterweight block 130, and its top end forms a connecting section, serving as the skeleton of the entire support system. The counterweight block 130 is located at the bottom of the rigid support plate 110 to increase the overall stability of the constant force support assembly 100. By providing sufficient self-weight, it resists potential overturning moments, ensuring that the rigid support plate 110 can firmly press against the inner tank wall plate 10. The counterweight block 130 can be made of high-density materials, such as metal blocks or concrete blocks. The top end of the rigid support plate 110 is bent radially outward from the cryogenic storage tank to form a connecting section. This section provides a structured connection interface for the connecting plate 120, allowing the connecting plate 120 to be fixed to the rigid support plate 110 at an appropriate angle and position, and further connected to the mounting bracket 200. The connecting plate 120 connects to the connecting section and has multiple connecting holes 101 extending radially along the cryogenic storage tank and spaced horizontally. The connecting plate 120 is a key component for achieving an adjustable connection between the constant force support assembly 100 and the mounting bracket 200, providing multiple selectable connection positions through the multiple connecting holes 101. These connecting holes 101 provide multiple preset connection points, allowing the mounting bracket 200 to be accurately adjusted horizontally to accommodate actual dimensional deviations or welding requirements of the inner tank wall panel 10. The mounting bracket 200 includes a mounting frame body, which, as the main structural part of the mounting bracket 200, extends vertically to support the prestressing application mechanism 300. The top of the mounting bracket body has a connection port, the size and shape of which should match the connection hole 101 to ensure a reliable connection via a connector. The connector is used to securely connect the connection port on the top of the mounting bracket body to any of the connection holes 101 on the connecting plate 120. The connector can be a bolt 1130, a pin, or other detachable fastener to ensure a secure connection while allowing for adjustment or disassembly as needed.

[0053] Through the above technical solution, the constant force support assembly 100 is specifically designed to include a rigid support plate 110, a counterweight 130, and a connecting plate 120. The rigid support plate 110 provides a robust support frame, while the counterweight 130 enhances overall stability, ensuring that the constant force support assembly 100 can firmly abut against the inner tank wall plate 10. Crucially, the connecting section formed by the bending at the top of the rigid support plate 110 connects to the connecting plate 120. Multiple connecting holes 101 extending radially and spaced horizontally on the connecting plate 120, combined with the connecting port at the top of the mounting bracket 200, allow the mounting bracket 200 to selectively connect to any connecting hole 101 on the connecting plate 120 via connectors. This design provides a multi-point adjustable connection method, allowing for accurate horizontal adjustment of the mounting bracket 200's position, thereby ensuring that the prestressing application mechanism 300 can accurately align with the vertical joint area and apply uniform and stable prestress. This not only improves the accuracy and reliability of prestressing application, but also greatly simplifies the on-site installation and commissioning process, improves construction efficiency, and effectively avoids welding quality problems caused by unstable support or inaccurate positioning.

[0054] Please continue reading. Figure 5 and Figure 6 In an embodiment of the present invention, the first adsorption assembly 400 includes a first suction nozzle 410, a first mounting tube 412, and a first air piping 420. The first suction nozzle 410 extends radially along the cryogenic storage tank. The first mounting tube 412 is mounted on the bottom end of the mounting bracket 200. The first adsorption pad 411 of the first suction nozzle 410 is mounted on one end of the first mounting tube 412. The first adsorption pad 411 is disposed in the bottom area of ​​the inner tank wall plate 10. A first adsorption space is formed between the first adsorption pad 411 and the side of the inner tank wall plate 10 facing the inner tank liner. One end of the first air piping 420 is connected to the first adsorption space through the other end of the first mounting tube 412. The other end of the first air piping 420 is connected to an external air configuration mechanism. The first air piping 420 is used to draw air or supply air to the first adsorption space, thereby causing the first adsorption pad 411 to adsorb or detach from the bottom area of ​​the inner tank wall plate 10 facing the inner tank liner.

[0055] The first suction nozzle 410 extends radially along the cryogenic storage tank. The first mounting pipe 412 is installed at the bottom end of the mounting bracket 200. The first adsorption pad 411 of the first suction nozzle 410 is installed at one end of the first mounting pipe 412. The first adsorption pad 411 is disposed in the bottom area of ​​the inner tank wall plate 10, and a first adsorption space is formed between the first adsorption pad 411 and the side of the inner tank wall plate 10 facing the inner tank liner. One end of the first air pipe 420 is connected to the first adsorption space through the other end of the first mounting pipe 412, and the other end of the first air pipe 420 is connected to an external air supply mechanism. The first air pipe 420 is used to draw or supply air to the first adsorption space, correspondingly causing the first adsorption pad 411 to adsorb or detach from the side of the inner tank wall plate 10 facing the inner tank liner.

[0056] The first adsorption assembly 400 is an important component of the prestressing system. Its core function is to temporarily connect or separate the bottom end of the mounting bracket 200 from the bottom area of ​​the inner tank wall plate 10 through controlled adsorption and detachment operations. This connection method avoids local stress concentration or damage that may be caused by mechanical clamping, and is particularly suitable for thin-walled structures. It is typically implemented based on the principle of negative pressure, achieving adsorption force by creating a local vacuum at the contact surface. The first suction nozzle 410 is the component in the first adsorption assembly 400 that directly contacts the inner tank wall plate 10 and forms the adsorption interface. Extending radially along the cryogenic storage tank, it aims to provide a sufficiently large adsorption contact area to ensure the stability and reliability of adsorption. The radially extended structural design helps to adapt to the curvature of the inner tank wall plate 10 and optimizes the distribution of adsorption force. The first mounting tube 412 is used to mechanically fix the first suction nozzle 410 to the bottom end of the mounting bracket 200. It not only provides structural support but also serves as part of the gas passage, connecting the external air configuration mechanism to the first adsorption space. Its installation method should ensure the stability of the connection while allowing gas flow. The first adsorption pad 411 is a key working component of the first suction nozzle 410, typically made of flexible materials (such as rubber or silicone), and is installed at one end of the first mounting tube 412. It directly contacts the side of the inner tank wall plate 10 facing the inner tank liner, and through its flexible deformation capability, it can tightly adhere to the surface of the inner tank wall plate 10, forming a relatively sealed adsorption area. The material selection and structural design of the first adsorption pad 411 are crucial to its adsorption effect and service life. The first adsorption space is a closed or semi-closed area formed between the first adsorption pad 411 and the side of the inner tank wall plate 10 facing the inner tank liner. When gas in this space is extracted, the pressure difference between the inside and outside will generate an adsorption force, causing the first adsorption pad 411 to tightly adhere to the inner tank wall plate 10. The sealing of this space is key to achieving effective adsorption. The first air pipe 420 is a gas channel connecting the first adsorption space to the external air supply mechanism. It is responsible for introducing external air extraction or supply operations into the first adsorption space, thereby controlling the adsorption or detachment state of the adsorption pad. The piping design should ensure good airtightness and withstand pressure changes during air extraction or supply. The external air configuration mechanism is a device that provides air extraction (generating negative pressure) or air supply (releasing negative pressure), such as a vacuum pump, compressor, or air tank with control valves. It regulates the air pressure in the first adsorption space through the first air piping 420, thereby achieving accurate control over the adsorption or detachment of the first adsorption pad 411 from the inner tank wall plate 10. Extracting air from the first adsorption space through the external air configuration mechanism reduces the air pressure within the space, creating a negative pressure that firmly adheres the first adsorption pad 411 to the inner tank wall plate 10. Conversely, supplying air to the first adsorption space balances the internal and external pressure difference, releasing the adsorption force and allowing the first adsorption pad 411 to detach from the inner tank wall plate 10. This controllable adsorption / detachment mechanism facilitates accurate operation of the prestressing application system in the bottom region of the inner tank wall plate 10.

[0057] Through the above technical solution, the first adsorption assembly 400 is specifically designed to include a first suction nozzle 410, a first mounting pipe 412, and a first air piping 420. The first suction nozzle 410 extends radially along the cryogenic storage tank, and its first adsorption pad 411 forms a first adsorption space with the bottom area of ​​the inner tank wall panel 10. Through the connection of the first air piping 420 with an external air supply mechanism, the first adsorption space can be accurately evacuated or supplied with air. When evacuating, the first adsorption pad 411 can stably and reliably adhere to the inner tank wall panel 10, providing a stable bottom support for the mounting bracket 200 and ensuring that the prestressing mechanism 300 can accurately apply prestress to the inner tank wall panel 10. When it is necessary to adjust or remove the equipment, the adsorption can be quickly released by supplying air, achieving a non-destructive detachment of the first adsorption pad 411 from the inner tank wall panel 10. This negative pressure adsorption-based connection method avoids the localized stress concentration or surface damage that traditional mechanical clamping may cause to the inner tank wall plate 10, making it particularly suitable for the inner tank wall plate 10 of thin-walled cryogenic storage tanks. Simultaneously, this solution enables precise control of the adsorption process, improving the convenience and safety of the prestressing application system operating in the bottom region of the inner tank wall plate 10, thus effectively solving the technical challenge of reliable adsorption and detachment of the inner tank wall plate 10 in a confined space.

[0058] Please continue reading. Figures 1 to 4 And see Figure 7 In an embodiment of the present invention, the back support device includes a clamping structure 1000, a second adsorption component 2000, and a rigid connecting rod 3000. The clamping structure 1000 is disposed near the vertical seam and is detachably clamped vertically to the top edge of the inner tank wall plate 10. The second adsorption component 2000 is disposed near the vertical seam and is located within the cold insulation filler filling space 20, and is located in the bottom region of the inner tank wall plate 10. The second adsorption component 2000 is used to adsorb or detach from the side of the inner tank wall plate 10 facing the inner tank liner. The rigid connecting rod 3000 extends vertically and is located within the cold insulation filler filling space 20. The bottom end of the rigid connecting rod 3000 is connected to the second adsorption component 2000, and the top end of the rigid connecting rod 3000 is connected to the clamping structure 1000.

[0059] The back support device includes a clamping structure 1000, a second adsorption component 2000, and a rigid connecting rod 3000. The clamping structure 1000 is positioned near the vertical seam and is detachably clamped vertically to the top edge of the inner tank wall panel 10. The second adsorption component 2000 is positioned near the vertical seam within the cold-insulating filler filling space 20 and is located in the bottom region of the inner tank wall panel 10. The second adsorption component 2000 is used to adsorb or detach from the side of the inner tank wall panel 10 facing the inner tank liner. The rigid connecting rod 3000 extends vertically and is positioned within the cold-insulating filler filling space 20. The bottom end of the rigid connecting rod 3000 is connected to the second adsorption component 2000, and the top end of the rigid connecting rod 3000 is connected to the clamping structure 1000.

[0060] The back support device is designed to provide stable support for the inner tank wall panel 10 to assist in the welding of the vertical seams. It achieves accurate fixation of the top and bottom areas of the inner tank wall panel 10 through the synergistic action of the clamping structure 1000, the second adsorption assembly 2000, and the rigid connecting rod 3000.

[0061] The clamping structure 1000 is used to detachably clamp the top edge of the inner tank wall panel 10 vertically. Its function is to provide upper positioning and fixation, preventing displacement or wobbling of the inner tank wall panel 10 during welding. The clamping structure 1000 can take various forms, such as through mechanical clamps, bolt 1130 fastening mechanisms, or hydraulic / pneumatic clamping mechanisms, to ensure a secure clamping of the top edge of the wall panel while facilitating installation and removal.

[0062] The second adsorption component 2000 is disposed within the insulation filler filling space 20 and located in the bottom region of the inner tank wall panel 10. It is used to adsorb or detach from the side of the inner tank wall panel 10 facing the inner tank liner. Its core function is to provide accurate and controllable positioning and support for the bottom of the inner tank wall panel 10. The adsorption method can employ vacuum adsorption, magnetic adsorption, or other reversible adsorption technologies. Through adsorption, displacement of the bottom of the wall panel due to gravity or external disturbance during welding can be effectively prevented, ensuring the alignment accuracy of the vertical seam.

[0063] The rigid connecting rod 3000 extends vertically and is disposed within the insulation packing space 20. Its bottom end is connected to the second adsorption component 2000, and its top end is connected to the clamping structure 1000. The function of the rigid connecting rod 3000 is to provide a robust framework, effectively combining the fixing force of the clamping structure 1000 on the top with the positioning force of the second adsorption component 2000 on the bottom, forming an integrated and stable support system. Its rigidity ensures the effective transmission of force and the stability of the structure throughout the entire support height, avoiding deformation of the support system itself, thereby ensuring the overall verticality and flatness of the inner tank wall plate 10.

[0064] Through the above technical solution, the back support device securely clamps the top edge of the inner tank wall panel 10 using the clamping structure 1000, and accurately adsorbs the bottom area of ​​the inner tank wall panel 10 using the second adsorption component 2000. The two are rigidly connected by a rigid connecting rod 3000, forming an integrated, highly stable support system from top to bottom. This structure effectively overcomes the instability issues that may exist in traditional detachable connection methods, ensuring that the inner tank wall panel 10 maintains accurate verticality and flatness throughout the vertical seam welding process, significantly improving the alignment accuracy and welding quality of the vertical seam. Simultaneously, the adsorption / detachment characteristics of the second adsorption component 2000 make the installation and disassembly of the back support device more convenient, improving construction efficiency.

[0065] Please continue reading. Figure 7 In an embodiment of the present invention, the clamping structure 1000 includes a mounting base 1100 and a clamping plate 1200. The mounting base 1100 is disposed on the side of the inner tank wall plate 10 away from the inner tank liner, and the clamping plate 1200 is disposed on the side of the inner tank wall plate 10 facing the inner tank liner. The clamping plate 1200 can slide along the radial direction of the cryogenic storage tank between a clamping position close to or far from the mounting base 1100 and a release position, thereby clamping or releasing the inner tank wall plate 10 accordingly.

[0066] Specifically, the clamping structure 1000 is a key component of the back support device. Its main function is to firmly clamp the top edge of the inner tank wall plate 10, thereby providing stable support for vertical seam welding. The design of this structure must ensure that the inner tank wall plate 10 does not shift during welding, while also facilitating installation and disassembly. The mounting base 1100, as a major component of the clamping structure 1000, is typically designed as a fixed or semi-fixed base, located on the side of the inner tank wall plate 10 facing away from the inner tank liner. This arrangement makes the mounting base 1100 easier to access and adjust during operation, and provides a stable support point for the clamping plate 1200. The mounting base 1100 can be made of high-strength metal to ensure its structural stability under clamping forces. The clamping plate 1200 is the component that directly contacts the inner tank wall plate 10 and applies clamping force; it is located on the side of the inner tank wall plate 10 facing the inner tank liner. The design of the clamping plate 1200 needs to consider the contact area and friction with the inner tank wall plate 10 to achieve reliable clamping. To achieve clamping and release functions, the clamping plate 1200 is designed to slide radially along the cryogenic storage tank. This sliding mechanism can be achieved through guide rails, sliders, or screws, ensuring that the clamping plate 1200 can move smoothly between the clamping and release positions. The radial sliding capability of the clamping plate 1200 is key to accurate clamping and release. When the clamping plate 1200 approaches the mounting base 1100, it clamps the inner tank wall plate 10, placing it in a stable clamping position; when the clamping plate 1200 moves away from the mounting base 1100, it releases the inner tank wall plate 10, facilitating adjustment or removal. This radial sliding not only adapts to the curvature of the inner tank wall plate 10 but also ensures a uniform distribution of clamping force, avoiding localized stress concentration on the inner tank wall plate 10.

[0067] Through the above technical solution, the clamping structure 1000, through the coordinated action of the mounting base 1100 and the clamping plate 1200, achieves stable and reliable clamping of the top edge of the inner tank wall plate 10. The mounting base 1100 is located on the outside of the inner tank wall plate 10, facilitating operation and fixation, while the clamping plate 1200 is located on the inside of the inner tank wall plate 10, and can accurately clamp or release the inner tank wall plate 10 by sliding radially. This design not only ensures the stability of the inner tank wall plate 10 during welding, effectively preventing displacement and thus improving welding quality and efficiency, but its sliding mechanism also greatly simplifies the installation, adjustment, and disassembly process of the back support device, improving the convenience and operational efficiency of on-site construction.

[0068] Please continue reading. Figure 7In an embodiment of the present invention, the mounting base 1100 includes an end plate 1110, a mounting plate 1120, and bolts 1130. The mounting plate 1120 extends radially along the cryogenic storage tank. One end of the mounting plate 1120 extends out of the inner tank wall plate 10 away from the inner tank liner and forms a mounting end. The other end of the mounting plate 1120 extends out of the inner tank wall plate 10 towards the inner tank liner and forms a connecting end. The top end of the rigid connecting rod 3000 is connected to the connecting end. The mounting plate 1120 extends vertically and is connected to the mounting end. 1120 and mounting plate 1120 form a T-shaped structure. Mounting plate 1120 has an assembly opening that extends radially along the cryogenic storage tank. Clamping plate 1200 extends vertically, with its top end extending beyond the top of the assembly opening to form a connecting part. Bolt 1130 extends radially along the cryogenic storage tank. One end of bolt 1130 along its extension direction is threadedly connected to mounting plate 1120, and the other end of bolt 1130 along its extension direction is rotatably connected to the connecting part. Bolt 1130 is used to drive clamping plate 1200 to slide between a clamping position and a releasing position through the connecting part.

[0069] Specifically, the design of the mounting plate 1120 allows it to span the thickness of the inner tank wall plate 10, providing structural support and connection points on both the inner and outer sides of the inner tank wall plate 10. One end forming the mounting end connects to the end plate 1110, together forming the robust main structure of the mounting base 1100; the other end forming the connection end serves as the top connection point of the rigid connecting rod 3000, ensuring the overall stability of the back support device and the effectiveness of force transmission. The radial extension of the mounting plate 1120 allows it to adapt to the curvature of the inner tank wall plate 10 of the cryogenic storage tank and provides accurate guidance for the radial sliding of the clamping plate 1200. The vertical extension of the end plate 1110 and its connection to the mounting end of the mounting plate 1120 form a T-shaped structure, significantly enhancing the overall rigidity and deformation resistance of the mounting base 1100. Especially when subjected to clamping forces, it effectively resists radial and vertical loads, thereby ensuring the stability and reliability of the clamping process. The radially extending mounting opening on the mounting plate 1120 provides a smooth sliding channel for the connecting portion of the clamping plate 1200, ensuring unobstructed radial movement of the clamping plate 1200 and facilitating its installation and maintenance. The connecting portion formed by the top of the mounting opening at the top of the clamping plate 1200 is the key part for its rotatable connection with the bolt 1130. This design allows the bolt 1130 to be easily operated from the outside, enabling accurate adjustment of the clamping plate 1200's position and clamping force. The bolt 1130, as the core driving element, has one end threadedly connected to the mounting plate 1120. Rotating the bolt 1130 allows for its own radial forward and backward movement. The other end of the bolt 1130 is rotatably connected to the connecting portion of the clamping plate 1200, converting the radial linear movement of the bolt 1130 into the radial sliding of the clamping plate 1200, thereby achieving clamping or releasing of the inner tank wall plate 10. This threaded drive mechanism provides stable, repeatable, and accurately controllable clamping operations.

[0070] Through the above technical solution, the mounting base 1100 is designed as a structure including an end plate 1110, a mounting plate 1120, and bolts 1130. The rotational connection between the bolts 1130 and the clamping plate 1200 achieves accurate control of the radial sliding of the clamping plate 1200. The radial extension of the mounting plate 1120 and the combination with the T-shaped end plate 1110 provide stable guidance and robust support for the sliding of the clamping plate 1200, effectively resisting the radial and vertical forces generated during clamping, ensuring the reliability and stability of the clamping. The threaded drive mechanism of the bolts 1130 allows the operator to conveniently and accurately adjust the clamping force by rotating the bolts 1130, thereby firmly clamping the inner tank wall plate 10 in a preset position or quickly releasing it when needed. Furthermore, the connecting end of the mounting plate 1120 is connected to the top of the rigid connecting rod 3000, ensuring the stability of the overall structure of the back support device and the effectiveness of force transmission. This design not only improves the convenience and accuracy of clamping operations, but also enhances the overall structural strength and reliability of the back support device, effectively solving the problems of inaccurate sliding control and unstable connection of the clamping plate 1200, thereby better assisting in the vertical seam welding of the inner tank wall plate 10.

[0071] Please continue reading. Figure 7 In an embodiment of the present invention, the second adsorption assembly 2000 includes a second suction nozzle 2100, a limiting seat 2200, and a second air pipe 2300. The second suction nozzle 2100 extends radially along the cryogenic storage tank. The second mounting tube 2120 of the second suction nozzle 2100 is mounted on the limiting seat 2200. The bottom end of the rigid connecting rod 3000 is connected to the limiting seat 2200. The second adsorption pad 2110 of the second suction nozzle 2100 is mounted on one end of the second mounting tube 2120. The second adsorption pad 2110 is disposed in the inner tank. In the bottom area of ​​the wall panel 10, a second adsorption space is formed between the second adsorption pad 2110 and the side of the inner tank wall panel 10 facing the inner tank liner. One end of the second air pipe 2300 is connected to the second adsorption space through the other end of the second mounting pipe 2120, and the other end of the second air pipe 2300 is connected to an external air configuration mechanism. The second air pipe 2300 is used to draw or supply air to the second adsorption space, thereby causing the second adsorption pad 2110 to adsorb or detach from the side of the inner tank wall panel 10 facing the inner tank liner.

[0072] Specifically, the second adsorption component 2000 is a key component for achieving the detachable connection at the bottom of the back support device, providing stable adsorption force through the principle of negative pressure. The second suction nozzle 2100, as the main adsorption component, is designed to extend radially along the cryogenic storage tank, allowing it to form a wider and more uniform contact surface with the bottom area of ​​the inner tank wall 10, thereby enhancing the stability and reliability of adsorption. The second suction nozzle 2100 is typically made of a material with a certain degree of flexibility to accommodate minor unevenness on the surface of the inner tank wall 10. The limiting seat 2200 provides a robust mounting platform for the second suction nozzle 2100 and the rigid connecting rod 3000, ensuring the structural integrity and positioning accuracy of the entire adsorption component. The limiting seat 2200 can be made of metal or high-strength engineering plastic to withstand the stress generated during adsorption and connection. The connection between the bottom end of the rigid connecting rod 3000 and the limiting seat 2200 allows the supporting force provided by the clamping structure 1000 of the back support device to be effectively transferred to the bottom of the inner tank wall 10, forming a stable support system. The rigid connecting rod 3000 is typically a metal rod, and its length can be adjusted according to actual needs. The second adsorption pad 2110, as a flexible component directly in contact with the inner tank wall 10, is crucial in its material and shape design for forming an effective second adsorption space, ensuring sufficient negative pressure during evacuation. The second adsorption pad 2110 is typically made of wear-resistant, low-temperature-resistant rubber or silicone material, and its edges are designed to form a tight seal against the surface of the inner tank wall 10. The second air piping 2300 serves as a gas transmission channel, accurately transmitting control commands (evacuation or supply) from the external air configuration mechanism to the second adsorption space, enabling switching between adsorption states. The second air piping 2300 can be a flexible or rigid pipe, equipped with corresponding quick connectors for easy installation and disassembly. The external air configuration mechanism is responsible for generating and controlling the vacuum or gas pressure, serving as the power source and control center for the normal operation of the entire adsorption system. It may include a vacuum pump, gas source, solenoid valve, pressure sensor, and controller.

[0073] Through the above technical solution, the structure of the second adsorption component 2000 has been clarified and optimized. The second suction nozzle 2100 extends radially along the cryogenic storage tank, forming a second adsorption space with the second adsorption pad 2110 and the inner tank wall plate 10, and is connected to the external air supply mechanism through the second air pipe 2300, realizing accurate control of the adsorption or detachment of the second adsorption pad 2110 from the inner tank wall plate 10. This design allows the bottom end of the back support device to be reliably and stably fixed in the bottom area of ​​the inner tank wall plate 10, ensuring the firmness of adsorption even when operating within the insulation filler filling space 20. At the same time, when it is necessary to move or disassemble the back support device, adsorption can be released by supplying air, making the operation simple and quick. This effectively solves the technical problem of how to stably and flexibly fix the bottom end of the back support device within the narrow and potentially obstructed insulation filler filling space 20, thereby ensuring the positioning accuracy and construction efficiency during the vertical seam welding process of the inner tank wall plate 10.

[0074] The following example will provide a more detailed explanation of the above technical solution: At the construction site of a large cryogenic storage tank, workers needed to weld the vertical seams of the inner tank wall panels 10. These inner tank wall panels 10 are the plates to be welded, with vertical seams formed between adjacent panels. There is an insulating filler space 20 between the inner tank wall panels 10 and the inner tank liner of the cryogenic storage tank. To ensure welding quality and improve construction efficiency, the vertical seam butt joint structure provided by this technical solution was adopted on site.

[0075] First, the construction workers vertically deploy the prestressing system in the area of ​​the vertical joint to be welded. A part of this system, the constant force support assembly 100, is abutted against the side of the inner tank wall panel 10 opposite to the inner tank liner. The constant force support assembly 100 includes a vertically extending rigid support plate 110, the bottom of which is connected to a counterweight 130 to provide stable support. The top of the rigid support plate 110 is bent radially outward from the cryogenic storage tank to form a connecting section.

[0076] Meanwhile, another part of the prestressing application system, namely the mounting bracket 200 and the prestressing application mechanism 300, is located on the side of the inner tank wall plate 10 facing the inner tank liner, i.e., within the cold insulation filler filling space 20. The mounting bracket 200 extends vertically, and its top end is connected to the connecting section of the constant force support assembly 100 via a connecting plate 120. The connecting plate 120 has multiple connecting holes 101 extending radially along the cryogenic storage tank. The connecting port at the top of the mounting bracket 200 body can be selectively connected to any of the connecting holes 101 via a connector, thereby achieving accurate alignment and adjustment of the prestressing application system in the horizontal direction.

[0077] A prestressing application mechanism 300 is disposed on the side of the mounting bracket 200 facing the inner tank wall plate 10. This mechanism includes multiple prestressing application components 320 spaced vertically and a flexible extrusion plate 310. Each prestressing application component 320 is radially expandable and contracts along the cryogenic storage tank and internally includes an inner tube 321, an outer tube 322, and a constant force spring. The inner tube 321 is mounted on the mounting bracket 200, and the outer tube 322 is slidably fitted onto the inner tube 321, with one end of the outer tube 322 connected to the flexible extrusion plate 310. The constant force spring is disposed between the flexible extrusion plate 310 and the inner tube 321, continuously pressing the flexible extrusion plate 310 against the side of the inner tank wall plate 10 facing the inner tank liner. This design allows the prestressing application system to apply prestress to both sides of the inner tank wall plate 10 in the vertical joint area, actively counteracting the deformation tendency caused by welding thermal cycles. Compared with traditional unilateral rigid constraints, this bidirectional, constant prestressing method significantly improves the control of welding deformation, ensuring the straightness and quality of the weld.

[0078] To facilitate the installation and disassembly of the prestressing application system, a first adsorption assembly 400 is provided at its bottom. The first adsorption assembly 400 includes a first suction nozzle 410, a first mounting pipe 412, and a first air piping 420. The first adsorption pad 411 of the first suction nozzle 410 is installed at one end of the first mounting pipe 412 and is located in the bottom region of the inner tank wall plate 10, forming a first adsorption space between it and the side of the inner tank wall plate 10 facing the inner tank liner. One end of the first air piping 420 communicates with the first adsorption space through the other end of the first mounting pipe 412, and the other end communicates with an external air distribution mechanism. By evacuating air into the first adsorption space, the first adsorption pad 411 can be firmly adsorbed onto the inner tank wall plate 10, achieving rapid positioning and fixation of the prestressing application system. After welding is completed, by supplying air to the first adsorption space, the first adsorption pad 411 can detach from the inner tank wall plate 10, simplifying the disassembly process.

[0079] Back support devices are also deployed at horizontally spaced locations along the prestressing application system. These back support devices also extend vertically, their top ends clamped to the top edge of the inner tank wall plate 10 via a clamping structure 1000. The clamping structure 1000, located near the vertical seam, includes a mounting base 1100 on the side of the inner tank wall plate 10 facing away from the inner tank liner and a clamping plate 1200 on the side of the inner tank wall plate 10 facing the inner tank liner. The mounting plate 1120 of the mounting base 1100 forms a T-shape with the end plate 1110, and the mounting plate 1120 has an assembly opening. The top end of the clamping plate 1200 extends beyond the top of the assembly opening to form a connecting portion. One end of a bolt 1130 is threadedly connected to the mounting plate 1120, and the other end is rotatably connected to the connecting portion. By rotating the bolt 1130, the clamping plate 1200 can slide between a clamping position near or away from the mounting base 1100 and a release position, thereby clamping or releasing the inner tank wall plate 10. This detachable clamping method avoids the cumbersome operation of fixing with a large number of bolts or welding required by traditional rigid support structures.

[0080] The bottom end of the back support device is detachably connected to the side of the inner tank wall plate 10 facing the inner tank liner via the second adsorption assembly 2000. The second adsorption assembly 2000 is located near the vertical seam and within the cold insulation filler filling space 20, in the bottom region of the inner tank wall plate 10. It includes a second suction nozzle 2100, a limiting seat 2200, and a second air pipe 2300. The second adsorption pad 2110 of the second suction nozzle 2100 is installed at one end of the second mounting pipe 2120, forming a second adsorption space between it and the side of the inner tank wall plate 10 facing the inner tank liner. The second air pipe 2300 is used to draw or supply air to the second adsorption space to adsorb or detach from the inner tank wall plate 10. A rigid connecting rod 3000 extends vertically and is located within the cold insulation filler filling space 20, with its bottom end connected to the limiting seat 2200 and its top end connected to the clamping structure 1000.

[0081] With the above structure, the prestressing system and the back support device are mainly arranged in the cold insulation filler space 20 between the inner tank wall plate 10 and the inner tank liner, or in a compact manner on the outside of the inner tank wall plate 10. This design greatly frees up the construction space inside the inner tank, making the welding operation surface more open and allowing multiple processes to be carried out smoothly, thus effectively solving the problem of the large construction space occupied by the support structure and the limitation of construction efficiency in the prior art.

[0082] Furthermore, both the prestressing application system and the back support device utilize adsorption components and clamping structures 1000 for rapid installation and disassembly. For example, the adsorption pad can be quickly attached to the inner tank wall plate 10 by pumping air, achieving rapid fixation; it can be quickly detached by supplying air. This convenient installation and disassembly method avoids the cumbersome bolt 1130 fixing, welding, or removal operations of traditional support structures, significantly shortening the construction cycle and reducing the frequency and difficulty of operators working in narrow, high-altitude areas. This effectively solves the problems of cumbersome installation and disassembly and high safety risks in existing technologies.

[0083] In summary, this technical solution cleverly arranges the prestressing application system and back support device within the insulation filler space 20, and employs efficient adsorption and clamping connection methods to achieve bidirectional prestress constraint and stable support for the vertical seam area of ​​the inner tank wall plate 10. This not only effectively controls welding deformation and improves weld quality, but also significantly optimizes the construction space, simplifies the installation and disassembly process, and enhances construction efficiency and safety, demonstrating the progressiveness of the overall technical solution.

[0084] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A vertical seam butt joint structure for the inner wall panel of a cryogenic storage tank, wherein the inner wall panel of the cryogenic storage tank is an inner tank wall panel to be welded, a vertical seam to be welded is provided between two adjacent inner tank wall panels, and a space for insulation filler is formed between the inner tank wall panel and the inner tank liner of the cryogenic storage tank, characterized in that, The vertical joint structure of the inner wall plate of the cryogenic storage tank includes: A prestressing application system extends vertically, a portion of which is abutted against the side of the inner tank wall plate facing the inner tank liner, and another portion of which is abutted against the side of the inner tank wall plate away from the inner tank liner. The prestressing application system is used to apply prestress to the inner tank wall plate acting on the vertical joint area. A back support device extends vertically and is spaced horizontally from the prestressing application system. The top end of the back support device is clamped to the top edge of the inner tank wall plate, and the bottom end of the back support device is detachably connected to the side of the inner tank wall plate facing the inner tank liner.

2. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in claim 1, characterized in that, The prestressing system includes a constant force support assembly, a mounting bracket, a prestressing mechanism, and a first adsorption assembly. The constant force support assembly extends vertically and abuts against the side of the inner tank wall facing away from the inner tank liner. The constant force support assembly is located near the vertical seam. The mounting bracket extends vertically and is positioned within the insulation filler space corresponding to the position of the constant force support assembly. The top end of the mounting bracket is connected to the top end of the constant force support assembly. The prestressing mechanism is located on the side of the mounting bracket facing the inner tank wall and is radially expandable and contractible along the cryogenic storage tank. The prestressing mechanism abuts against the side of the inner tank wall facing the inner tank liner. The first adsorption assembly is located at the bottom end of the mounting bracket and is used to adsorb or detach from the bottom area of ​​the inner tank wall facing the inner tank liner.

3. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in claim 2, characterized in that, The prestressing mechanism includes a flexible extrusion plate and multiple prestressing components. The multiple prestressing components are vertically spaced on the side of the mounting frame facing the inner tank wall. Each of the multiple prestressing components can extend and retract radially along the cryogenic storage tank. The flexible extrusion plate extends vertically and is disposed between the multiple prestressing components and the inner tank wall. The multiple prestressing components are used to press the flexible extrusion plate against the side of the inner tank wall facing the inner tank liner.

4. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in claim 3, characterized in that, The prestressing application assembly includes an inner tube, an outer tube, and a constant force spring. The inner tube is installed on the mounting bracket. The outer tube is slidably sleeved on the inner tube along the radial direction of the cryogenic storage tank. One end of the outer tube is connected to the flexible extrusion plate. The constant force spring is disposed between the flexible extrusion plate and the inner tube. The constant force spring is used to press the flexible extrusion plate against the side of the inner tank wall facing the inner tank liner.

5. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in claim 4, characterized in that, The constant force support assembly includes a rigid support plate, a connecting plate, and a counterweight. The rigid support plate extends vertically, and its bottom end is connected to the counterweight. The rigid support plate abuts against the inner tank wall on the side opposite to the inner tank liner. The top end of the rigid support plate is bent radially outward from the cryogenic storage tank to form a connecting section. The connecting plate is connected to the connecting section. The connecting plate has multiple connecting holes, all of which extend radially from the cryogenic storage tank and are spaced horizontally. The mounting bracket includes a mounting frame body that extends vertically. The top of the mounting frame body has a connecting port, which can be selectively connected to any of the connecting holes via a connector.

6. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in claim 5, characterized in that, The first adsorption assembly includes a first suction nozzle, a first mounting tube, and a first air piping. The first suction nozzle extends radially along the cryogenic storage tank. The first mounting tube is installed at the bottom end of the mounting bracket. A first adsorption pad of the first suction nozzle is installed at one end of the first mounting tube. The first adsorption pad is disposed in the bottom area of ​​the inner tank wall plate. A first adsorption space is formed between the first adsorption pad and the side of the inner tank wall plate facing the inner tank liner. One end of the first air piping communicates with the first adsorption space through the other end of the first mounting tube. The other end of the first air piping communicates with an external air supply mechanism. The first air piping is used to draw or supply air to the first adsorption space, correspondingly causing the first adsorption pad to adsorb or detach from the bottom area of ​​the inner tank wall plate facing the inner tank liner.

7. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in any one of claims 1 to 6, characterized in that, The back support device includes a clamping structure, a second adsorption component, and a rigid connecting rod. The clamping structure is located near the vertical seam and is detachably clamped vertically to the top edge of the inner tank wall plate. The second adsorption component is located near the vertical seam and is disposed within the cold insulation filler filling space, and is located in the bottom region of the inner tank wall plate. The second adsorption component is used to adsorb or detach from the side of the inner tank wall plate facing the inner tank liner. The rigid connecting rod extends vertically and is disposed within the cold insulation filler filling space. The bottom end of the rigid connecting rod is connected to the second adsorption component, and the top end of the rigid connecting rod is connected to the clamping structure.

8. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in claim 7, characterized in that, The clamping structure includes a mounting base and a clamping plate. The mounting base is disposed on the side of the inner tank wall plate away from the inner tank liner, and the clamping plate is disposed on the side of the inner tank wall plate facing the inner tank liner. The clamping plate can slide along the radial direction of the cryogenic storage tank between a clamping position close to or far from the mounting base and a release position, thereby clamping or releasing the inner tank wall plate accordingly.

9. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in claim 8, characterized in that, The mounting base includes an end plate, a mounting plate, and bolts. The mounting plate extends radially along the cryogenic storage tank. One end of the mounting plate extends out of the inner tank wall plate away from the inner tank liner and forms a mounting end. The other end of the mounting plate extends out of the inner tank wall plate towards the inner tank liner and forms a connecting end. The top end of the rigid connecting rod is connected to the connecting end. The mounting plate extends vertically and is connected to the mounting end. The mounting plate and the mounting plate form a T-shaped structure. An assembly opening is provided on the mounting plate, extending radially along the cryogenic storage tank. A clamping plate extends vertically, with its top end extending out of the top of the assembly opening and forming a connecting portion. The bolt extends radially along the cryogenic storage tank. One end of the bolt extends threadedly to the mounting plate, and the other end extends rotatably to the connecting portion. The bolt is used to drive the clamping plate to slide between the clamping position and the release position via the connecting portion.

10. The vertical joint connection structure of the inner tank wall plate of the cryogenic storage tank as described in claim 9, characterized in that, The second adsorption assembly includes a second suction nozzle, a limiting seat, and a second air piping. The second suction nozzle extends radially along the cryogenic storage tank. A second mounting tube of the second suction nozzle is installed on the limiting seat. The bottom end of the rigid connecting rod is connected to the limiting seat. A second adsorption pad of the second suction nozzle is installed at one end of the second mounting tube. The second adsorption pad is disposed in the bottom area of ​​the inner tank wall plate. A second adsorption space is formed between the second adsorption pad and the side of the inner tank wall plate facing the inner tank liner. One end of the second air piping communicates with the second adsorption space through the other end of the second mounting tube. The other end of the second air piping communicates with an external air supply mechanism. The second air piping is used to draw or supply air to the second adsorption space, correspondingly causing the second adsorption pad to adsorb or detach from the side of the inner tank wall plate facing the inner tank liner.

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