Prestress applying system and method for inhibiting welding deformation of low-temperature storage tank wall plate

Abstract

The application discloses a prestress applying system and method for inhibiting welding deformation of a low-temperature storage tank wall plate, and relates to the technical field of LNG storage tank inner tank construction. The prestress applying system for inhibiting welding deformation of the low-temperature storage tank wall plate comprises a constant force supporting assembly, a mounting bracket, a prestress applying mechanism and a suction assembly. The constant force supporting assembly is in abutment against one side of the inner tank wall plate away from the inner tank lining plate. The mounting bracket is arranged in the cold insulation filler filling space in correspondence with the position of the constant force supporting assembly. The prestress applying mechanism is arranged on the side of the mounting bracket facing the inner tank wall plate, and the prestress applying mechanism can stretch and contract along the radial direction of the low-temperature storage tank. The prestress applying mechanism is used for abutting against the side of the inner tank wall plate facing the inner tank lining plate. The suction assembly is arranged at the bottom end of the mounting bracket and is used for adsorbing or separating from the inner tank wall plate. The application can eliminate the risk of welding deformation of the low-temperature storage tank wall plate, release the inner tank internal construction space, and improve the construction efficiency and safety.

Description

Technical Field

[0001] This invention relates to the field of LNG storage tank inner tank construction technology, and in particular to a prestressing application system and method for suppressing welding deformation of cryogenic storage tank wall panels. Background Technology

[0002] In recent years, with the global energy structure transformation and the continued growth in demand for clean energy, liquefied natural gas (LNG), as an important clean energy carrier, has seen rapid development in its storage and transportation technologies. Large-scale full-containment LNG storage tanks, as a key infrastructure in the LNG industry chain, are expanding in scale. Throughout this development, the welding quality control technology of the tank's inner wall plates has remained a core technical challenge in ensuring the structural integrity, operational safety, and shortening the overall construction cycle of the tanks.

[0003] Currently, the construction of inner tank wall panels for large full-containment LNG storage tanks generally adopts a method of segmented hoisting followed by on-site assembly and welding. Among them, the vertical seam, i.e., the longitudinal butt weld, is the core part connecting adjacent wall panels, and the control of its welding deformation directly affects the overall quality of the storage tank.

[0004] However, in existing technologies, the installation location of the support structure severely encroaches on the already limited construction space inside the inner tank, making it difficult to carry out multi-process cross-operations. On the other hand, the installation and dismantling process of the support structure is extremely cumbersome, requiring operators to work frequently on the narrow, elevated temporary construction platform inside the inner tank. This not only significantly extends the construction period and reduces the overall construction efficiency of the LNG storage tank inner tank, but also increases the safety risks of personnel falls and collisions due to space constraints and frequent operations. In addition, traditional support methods are unable to form an effective prestress distribution on both sides of the wall panel, and cannot actively counteract the deformation trend caused by welding thermal cycles, resulting in unsatisfactory welding deformation control. Summary of the Invention

[0005] The main objective of this invention is to propose a prestressing application system and method for suppressing welding deformation of cryogenic storage tank wall panels, aiming to eliminate the risk of welding deformation of cryogenic storage tank wall panels, while freeing up construction space inside the tank and improving construction efficiency and safety.

[0006] To achieve the above objectives, the present invention proposes a prestressing system for suppressing welding deformation of cryogenic storage tank wall panels. The cryogenic storage tank wall panel is an inner tank wall panel to be welded, with a vertical seam to be welded between two adjacent inner tank wall panels. A space filled with insulating filler is formed between the inner tank wall panel and the inner tank liner of the cryogenic storage tank. The prestressing system for suppressing welding deformation of cryogenic storage tank wall panels includes:

[0007] A constant force support assembly extends vertically and abuts against the side of the inner tank wall panel away from the inner tank liner. The constant force support assembly is located near the vertical joint. The mounting bracket extends vertically and is positioned within the cold insulation filler space corresponding to the position of the constant force support component. The top end of the mounting bracket is connected to the top end of the constant force support component. A prestressing mechanism is provided on the side of the mounting bracket facing the inner tank wall plate. The prestressing mechanism can extend and retract radially along the cryogenic storage tank. The prestressing mechanism is used to press against the side of the inner tank wall plate facing the inner tank liner. An adsorption component is disposed at the bottom end of the mounting bracket. The adsorption component is used to adsorb or detach from the bottom area of ​​the inner tank wall plate facing the inner tank liner.

[0008] 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.

[0009] 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.

[0010] 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, and the top end of the mounting bracket is connected to the connecting plate.

[0011] In one embodiment, a flexible buffer pad is provided between the rigid support plate and the inner tank wall plate.

[0012] In one embodiment, the top end of the mounting bracket is detachably mounted to the connecting plate.

[0013] In one embodiment, the connecting plate has a plurality of connecting holes, all of which extend radially along the cryogenic storage tank and are spaced apart horizontally. The mounting bracket includes a mounting frame body that extends vertically, and a connecting port is provided at the top of the mounting frame body. The connecting port can be selectively connected to any of the connecting holes via a connector.

[0014] In one embodiment, the adsorption assembly includes a suction nozzle and an air pipe. The suction nozzle extends radially along the cryogenic storage tank and is mounted on the bottom end of the mounting bracket. One end of the air pipe is connected to the suction nozzle, and the other end of the air pipe is connected to an external air supply mechanism. The air pipe is used to draw or supply air to the suction nozzle, thereby causing the suction nozzle to adsorb or detach from the bottom area of ​​the inner tank wall facing the inner tank liner.

[0015] In one embodiment, the suction nozzle includes an adsorption pad and an installation tube. The installation tube is installed at the bottom end of the mounting bracket, and the adsorption pad is installed at one end of the installation tube. The adsorption pad is disposed in the bottom area of ​​the inner tank wall plate. An adsorption space is formed between the adsorption pad and the side of the inner tank wall plate facing the inner tank liner. One end of the air pipe is connected to the adsorption space through the other end of the installation tube. The air pipe is used to draw air into or supply air to the adsorption space, thereby causing the adsorption pad to adsorb or detach from the bottom area of ​​the inner tank wall plate facing the inner tank liner.

[0016] This invention also proposes a prestressing method for suppressing welding deformation of cryogenic storage tank wall panels, using the prestressing system for suppressing welding deformation of cryogenic storage tank wall panels as described above. The prestressing method for suppressing welding deformation of cryogenic storage tank wall panels includes: Move the prestressing system for suppressing welding deformation of the cryogenic tank wall to the target position, so that the constant force support assembly abuts against the side of the inner tank wall away from the inner tank liner, and align the adsorption assembly with the bottom area of ​​the inner tank wall facing the inner tank liner. The adsorption assembly is controlled to perform an adsorption operation to fix the bottom end of the mounting bracket to the inner tank wall plate. At the same time, the prestressing mechanism is squeezed by the inner tank wall plate, so that the prestressing mechanism presses against and applies a preset prestress to the side of the inner tank wall plate facing the inner tank liner. While maintaining the coordinated force application of the prestressing mechanism and the constant force support assembly on the inner tank wall plate, the vertical seam is welded; After welding is completed, the prestressing system for suppressing welding deformation of the cryogenic tank wall is removed from the space filled with the insulation packing.

[0017] The technical solution of this invention applies prestress simultaneously from both the inner and outer sides of the inner tank wall plate through the synergistic effect of the constant force support component, the mounting bracket, the prestressing application mechanism, and the adsorption component. During the vertical seam welding process of the inner tank wall plate, it can effectively offset the welding thermal deformation and avoid the problem of traditional support frames occupying central space. This reduces the construction space occupation and improves work efficiency and safety. 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 prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates provided by the present invention; Figure 2 A schematic diagram of another embodiment of the prestressing application system for suppressing welding deformation of cryogenic storage tank wall provided by the present invention; Figure 3 A schematic diagram of a structure of an embodiment of the prestressing application component involved in the present invention; Figure 4 This is a schematic diagram of an embodiment of the mounting bracket 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. Prestressing application mechanism; 400. Adsorption assembly; 110. Rigid support plate; 120. Connecting plate; 130. Counterweight; 101. Connecting hole; 310. Flexible extrusion plate; 320. Prestressing application assembly; 321. Inner tube; 322. Outer tube; 410. Suction nozzle; 420. Air piping; 411. Adsorption pad; 412. Mounting pipe.

[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] The existing arrangement of welded support frames for the inner tank walls of liquefied natural gas (LNG) storage tanks has significant shortcomings. On the one hand, the installation location of the support structure severely encroaches on the internal construction space of the inner tank, restricting multi-process cross-operation; on the other hand, its installation and dismantling process is cumbersome, not only extending the construction period and reducing efficiency, but also increasing personnel safety risks. In addition, the traditional method is difficult to form an effective prestress distribution on both sides of the wall panels, and cannot actively counteract the deformation trend caused by welding thermal cycles, resulting in unsatisfactory welding deformation control.

[0026] To address this technical problem, this invention proposes a prestressing system and method for suppressing welding deformation of cryogenic storage tank wall panels.

[0027] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4In one embodiment of the present invention, the cryogenic storage tank wall plate is an inner tank wall plate 10 to be welded, and a vertical seam to be welded is provided between two adjacent inner tank wall plates 10. A cold-insulating filler filling space 20 is formed between the inner tank wall plate 10 and the inner tank liner of the cryogenic storage tank. The prestressing application system for mainly inhibiting the welding deformation of the cryogenic storage tank wall plate includes a constant force support assembly 100, a mounting bracket 200, a prestressing application mechanism 300, and an 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 located near the vertical seam. Extending vertically, the mounting bracket 200 is positioned within the cold insulation filler filling space 20, corresponding to the position of the constant force support component 100. The top end of the mounting bracket 200 is connected to the top end of the constant force support component 100. The prestressing mechanism 300 is located on the side of the mounting bracket 200 facing the inner tank wall plate 10. 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 adsorption component 400 is located at the bottom end of the mounting bracket 200. The adsorption component 400 is used to adsorb or detach from the bottom area of ​​the inner tank wall plate 10 facing the inner tank liner.

[0028] For ease of understanding, the following explains some key terms in this embodiment: Cryogenic tank wall panels, specifically referring to the inner tank wall panels 10 used for storing cryogenic media in large full-containment LNG storage tanks, are typically composed of multiple curved plates and are an important component of the tank structure. These inner tank wall panels 10 require welding during construction to form a complete inner tank structure.

[0029] A vertical seam refers to the vertical joint formed between two adjacent inner tank wall panels 10, which is to be welded. The welding quality of this vertical seam directly affects the structural integrity and sealing performance of the inner tank.

[0030] The insulation filler space 20 refers to the annular space reserved between the inner tank wall plate 10 and the inner tank liner of the cryogenic storage tank for filling with insulation material. This space is used to insulate heat and maintain the low-temperature environment of the inner tank during the operation of the storage tank.

[0031] The constant force support assembly 100 is a device that extends vertically and abuts against the side of the inner tank wall plate 10 away from the inner tank liner. This assembly is positioned near the vertical seam and its function is to provide stable external support for the inner tank wall plate 10 to balance the force applied from the inside by the prestressing application mechanism 300.

[0032] Mounting bracket 200 refers to a vertically extending structure disposed within the cold insulation filler filling space 20 and connected to the top of the constant force support assembly 100. This mounting bracket 200 is used to support the prestressing application mechanism 300 and the adsorption assembly 400, and positions them inside the inner tank wall plate 10.

[0033] The prestressing application mechanism 300 is a device installed on the side of the mounting bracket 200 facing the inner tank wall plate 10. This mechanism can extend and retract radially along the cryogenic storage tank to press against the side of the inner tank wall plate 10 facing the inner tank liner and apply a preset prestress to it.

[0034] The adsorption component 400 is a device disposed at the bottom of the mounting bracket 200. This component is used to fix the bottom of the mounting bracket 200 to the bottom area of ​​the inner tank wall plate 10 through adsorption, thereby providing stable positioning and support for the entire system.

[0035] Prestress refers to the stress applied to the inner tank wall plate 10 before welding, which is opposite to the expected welding deformation trend. By applying prestress, the deformation caused by the welding thermal cycle can be effectively counteracted, thereby controlling the shape accuracy of the wall plate after welding.

[0036] This embodiment provides a prestressing application system for suppressing welding deformation of cryogenic storage tank wall panels. The system mainly consists of a constant force support assembly 100, a mounting bracket 200, a prestressing application mechanism 300, and an adsorption assembly 400. It aims to apply prestress to the vertical seam area of ​​the inner tank wall panel 10 through synergistic action to counteract welding deformation.

[0037] The constant force support assembly 100 is designed as a vertically extending structure that functions to abut against the side of the inner tank wall panel 10 opposite to the inner tank liner and is positioned close to the vertical seam to be welded. As one implementation, the constant force support assembly 100 can be a simple gravity support rod, with its bottom providing downward stabilizing force via a counterweight 130, and its top contacting the outer side of the inner tank wall panel 10 via a simple contact pad. In another implementation, the assembly can be a support beam fixed to an external structure by mechanical bolts or clamps, which abuts against the inner tank wall panel 10 by adjusting the depth of the bolt insertion.

[0038] The mounting bracket 200 is designed as a vertically extending structure, positioned within the insulation filler space 20 corresponding to the position of the constant force support assembly 100. The top end of the mounting bracket 200 is connected to the top end of the constant force support assembly 100. Specifically, the mounting bracket 200 can be a simple metal frame, its top end fixedly connected to the top end of the constant force support assembly 100 by welding or bolting. In another implementation, the top end of the mounting bracket 200 can be designed as a U-shaped groove, into which the top end of the constant force support assembly 100 is inserted and secured with a pin.

[0039] A prestressing application mechanism 300 is disposed on the side of the mounting bracket 200 facing the inner tank wall plate 10. This mechanism is capable of radial extension and retraction along the cryogenic storage tank to abut against the side of the inner tank wall plate 10 facing the inner tank liner. In one implementation, the prestressing application mechanism 300 can consist of a series of independent hydraulic or pneumatic cylinders that directly abut against the inner tank wall plate 10 through the ends of their piston rods. The extension and retraction stroke and applied pressure of each hydraulic or pneumatic cylinder can be controlled independently or centrally. Alternatively, the mechanism can be an array of multiple helical springs, pre-compressed and mounted on the mounting bracket 200, with the spring force transmitted to the inner tank wall plate 10 via a simple flat plate.

[0040] The adsorption assembly 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 panel 10 facing the inner tank liner. As one implementation, the adsorption assembly 400 can be a simple magnetic chuck, adsorbed onto the bottom area of ​​the inner tank wall panel 10 by electromagnetic or permanent magnet action. When detachment is required, the magnetism can be released by power disconnection or mechanical operation. Alternatively, the assembly can be a contact pad with an adhesive material, adhering to the inner tank wall panel 10 through contact and detached by mechanical peeling after the operation is complete.

[0041] Through the synergistic effect of the aforementioned components, the constant force support assembly 100 and the prestressing application mechanism 300 can apply prestress to the inner tank wall plate 10 from both sides, acting on the vertical seam area. Specifically, after the adsorption assembly 400 fixes the mounting bracket 200 to the bottom inner side of the inner tank wall plate 10, the prestressing application mechanism 300 applies radial pressure to the inner side of the inner tank wall plate 10, while the constant force support assembly 100 provides reverse support on the outer side of the inner tank wall plate 10. Thus, a controlled prestress distribution is formed in the vertical seam area to be welded, which is opposite to the trend of welding thermal deformation, thereby effectively suppressing deformation generated during the welding process.

[0042] The prestressing application system in this embodiment applies prestress from both sides of the inner tank wall plate 10 to the vertical seam area by placing the prestressing application mechanism 300 and the adsorption component 400 within the cold insulation filler filling space 20 and cooperating with the external constant force support component 100. This effectively counteracts the deformation trend caused by welding thermal cycling and significantly improves the control of welding deformation. Simultaneously, the system avoids the need for large support structures inside the inner tank, thus freeing up valuable internal construction space, facilitating multi-process cross-operations, simplifying installation and disassembly processes, thereby improving construction efficiency and reducing the safety risks of working at heights.

[0043] Please continue reading. Figures 1 to 4In 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] The flexible extrusion plate 310 is a plate-like structure with a certain degree of flexibility or deformability. Its function is to act as an intermediate medium between the prestressing application components 320 and the inner tank wall plate 10, uniformly transferring the force applied by the multiple prestressing application components 320 to the inner tank wall plate 10, and deforming itself to adapt to the curvature of the inner tank wall plate 10. The flexible extrusion plate 310 can be made of elastic materials (such as rubber, polyurethane, etc.) or composed of multiple relatively movable rigid blocks connected by flexible connectors (such as hinges, springs, etc.) to achieve overall flexibility. Its thickness, material hardness, and other parameters can be optimized according to the curvature of the inner tank wall plate 10 and the required prestress.

[0045] Multiple prestressing application components 320 are independent, radially expandable units that apply thrust to the flexible extrusion plate 310, thereby transferring prestress to the inner tank wall plate 10 through the flexible extrusion plate 310. These components can be hydraulic cylinders, pneumatic cylinders, spring mechanisms, or electric push rods, etc. They are arranged vertically at intervals to ensure uniform prestress is applied across the entire height of the inner tank wall plate 10, avoiding localized stress concentration or insufficiency. Each prestressing application component 320 can expand and contract radially along the cryogenic storage tank, allowing it to independently adjust its extension length to accommodate the deformation of the flexible extrusion plate 310 and the curvature of the inner tank wall plate 10, and to apply the required prestress. This independent expansion and contraction capability is achieved through expansion mechanisms (such as pistons, springs, lead screws, etc.) within each component.

[0046] Through the above technical solution, this application can achieve uniform prestressing of the inner tank wall plate 10. Specifically, multiple prestressing application components 320 are arranged vertically at intervals and can all extend and retract radially along the cryogenic storage tank. They work together on the flexible extrusion plate 310. Due to its flexibility, the flexible extrusion plate 310 can adaptively conform to the curvature of the inner tank wall plate 10, uniformly distributing and transferring the force from the multiple prestressing application components 320 to the entire contact surface of the inner tank wall plate 10. This surface contact force application method effectively avoids the stress concentration and uneven prestress distribution problems that may be caused by traditional rigid or point force application, ensuring that the prestress can act more comprehensively and effectively on the vertical joint area, thereby significantly improving the effect of suppressing welding deformation and ensuring the welding quality and structural integrity of the cryogenic storage tank inner tank wall plate 10.

[0047] Please refer to section 3. 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] Specifically, the inner tube 321 serves as the fixed base for the prestressing application assembly 320, and is securely mounted on the mounting bracket 200, providing stable support and guidance for the radial expansion and contraction of the entire assembly. The inner tube 321 is typically made of high-strength material to withstand the reaction force generated during prestressing application and to ensure its structural stability during long-term use. The outer tube 322 is designed to slide smoothly along the radial direction of the cryogenic storage tank outside the inner tube 321. This sliding fit allows the prestressing application assembly 320 to adaptively adjust according to the actual position and curvature of the inner tank wall 10, ensuring that the flexible extrusion plate 310 is always in close contact with the inner tank wall 10. One end of the outer tube 322 is directly or indirectly connected to the flexible extrusion plate 310, responsible for transmitting the thrust generated by the constant force spring to the flexible extrusion plate 310. The constant force spring is the core component of the prestressing application assembly 320, characterized by its ability to provide an almost constant force over a large deformation range. Unlike traditional helical springs, the force output of a constant force spring does not change significantly with its compression or extension, thus ensuring the stability of the prestress applied to the inner tank wall plate 10. The constant force spring is cleverly arranged between the flexible extrusion plate 310 and the inner tube 321. When the prestress application mechanism 300 is compressed by the inner tank wall plate 10, the constant force spring is compressed or stretched to its working range and continuously pushes the flexible extrusion plate 310 towards the inner tank wall plate 10 to apply a preset constant prestress.

[0049] By introducing a combination of inner tube 321, outer tube 322, and a constant force spring, this application ensures that the prestressing application mechanism 300 provides continuous and stable prestress when pressed against the inner tank wall plate 10. The characteristics of the constant force spring allow it to output an almost constant force within a certain deformation range, thus effectively overcoming the limitation of traditional springs where the force varies with deformation. The sliding fit between the inner tube 321 and outer tube 322 provides accurate radial extension and contraction guidance for the constant force spring, ensuring the stability and directionality of prestress application. This design allows the flexible extrusion plate 310 to always be tightly pressed against the inner tank wall plate 10 with a preset constant pressure. Even if the inner tank wall plate 10 has slight curvature changes or undergoes minor displacement during welding, the prestress can still be applied uniformly, thereby significantly improving the accuracy and reliability of prestress application, effectively suppressing welding deformation, and ensuring welding quality.

[0050] Please continue reading 3 and... Figure 4 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 the bottom end of the rigid support plate 110 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 low-temperature storage tank to form a connecting section. The connecting plate 120 is connected to the connecting section, and the top end of the mounting bracket 200 is connected to the connecting plate 120.

[0051] Specifically, the rigid support plate 110 extends vertically, and its main function is to serve as the primary contact surface between the constant force support assembly 100 and the inner tank wall plate 10, providing stable and uniform support force. Due to its rigidity, it can effectively resist any local deformation that may occur in the inner tank wall plate 10 under prestress, ensuring accurate transmission of prestress. The rigid support plate 110 can be made of high-strength steel or other materials with sufficient rigidity and load-bearing capacity, and its size and shape can be customized according to the curvature and height of the inner tank wall plate 10 to achieve the best fit.

[0052] The counterweight 130 is connected to the bottom end of the rigid support plate 110. The main function of the counterweight 130 is to increase the overall weight and stability of the constant force support assembly 100, enabling it to firmly abut against the side of the inner tank wall plate 10 facing away from the inner tank liner, preventing tipping or displacement during prestressing. The counterweight 130's gravity assists the rigid support plate 110 in providing continuous and stable support. The counterweight 130 is typically made of a high-density metal, such as cast iron or lead, and its weight can be accurately calculated and configured according to the required stability and support force of the system.

[0053] The top of the rigid support plate 110 is bent radially outward from the cryogenic storage tank to form a connecting section. This connecting section cleverly separates the vertical support function from the horizontal connection function, providing a clear and stable connection interface for the subsequent connecting plate 120. This bending structure helps optimize the force transmission path, ensuring that the force applied by the mounting bracket 200 can be effectively transmitted through the connecting plate 120 and the connecting section to the rigid support plate 110, and then acts on the inner tank wall plate 10.

[0054] The connecting plate 120 is connected to the connecting section, and the top of the mounting bracket 200 is also connected to the connecting plate 120. As a key connecting component between the constant force support assembly 100 and the mounting bracket 200, the connecting plate 120 achieves mechanical coupling between the two, ensuring that the entire prestressing application system works collaboratively as a whole. The connecting plate 120 can be connected to the connecting section and the mounting bracket 200 using bolts, pins, or other detachable connection methods to facilitate system installation, adjustment, and disassembly. This connection method ensures the structural uniformity of the constant force support assembly 100 and the mounting bracket 200, enabling the prestressing application mechanism 300 and the constant force support assembly 100 to stably apply a synergistic force to the inner tank wall plate 10.

[0055] By introducing the rigid support plate 110, connecting plate 120, and counterweight 130, this application effectively solves the stability problem of the constant force support assembly 100 when supporting the inner tank wall plate 10 and the connection problem with the mounting bracket 200. The rigid support plate 110 extends vertically and abuts against the inner tank wall plate 10. Combined with the counterweight 130 at the bottom, this significantly enhances the overall stability of the constant force support assembly 100, ensuring that it can stably support the inner tank wall plate 10 during the application of prestress, preventing swaying or displacement. Simultaneously, the connecting section formed by the bend at the top of the rigid support plate 110, in conjunction with the connecting plate 120, provides a structurally stable connection point with a clear force transmission path for the top of the mounting bracket 200. This design allows the constant force support assembly 100 and the mounting bracket 200 to form a compact and synergistic whole, ensuring that the prestressing mechanism 300 and the constant force support assembly 100 can stably and accurately apply prestress to the vertical joint area from both sides of the inner tank wall plate 10, thereby effectively suppressing welding deformation and improving welding quality.

[0056] In an embodiment of the present invention, a flexible buffer pad is provided between the rigid support plate 110 and the inner tank wall plate 10.

[0057] A flexible buffer pad is a layer of material with a certain degree of elasticity and compressibility. Its main function is to provide cushioning, distribute stress, and protect the surface between two contact surfaces. This buffer pad can be made of various materials, such as rubber, silicone, polyurethane, polymer composites, or engineering plastics, which typically possess good wear resistance, weather resistance, and chemical stability. The thickness, hardness, and shape of the flexible buffer pad can be designed according to actual application requirements to ensure that it can effectively absorb impact, uniformly transfer load, and adapt to the microscopic surface morphology of the inner tank wall plate 10 when subjected to the pressure of the rigid support plate 110. For example, a material with a certain coefficient of friction can be used to prevent relative slippage of the rigid support plate 110 when prestressing is applied. Furthermore, the flexible buffer pad can be installed between the rigid support plate 110 and the inner tank wall plate 10 by adhesive bonding, mechanical fixing, or simple placement.

[0058] By setting a flexible buffer pad between the rigid support plate 110 and the inner tank wall plate 10, the buffer pad can effectively absorb and disperse the local pressure applied by the rigid support plate 110, avoiding surface scratches, indentations, or local stress concentrations that may be caused by the rigid support plate 110 directly contacting the inner tank wall plate 10. The elastic properties of the flexible buffer pad allow it to better adapt to the unevenness of the inner tank wall plate 10 surface, thereby ensuring that the prestress can be applied more evenly and gently to the vertical joint area of ​​the inner tank wall plate 10. This not only protects the integrity of the inner tank wall plate 10 and extends its service life, but also improves the accuracy and stability of prestress application, helps to more effectively suppress welding deformation, and thus improves the overall construction quality of the cryogenic storage tank.

[0059] In an embodiment of the present invention, the top end of the mounting bracket 200 is detachably mounted to the connecting plate 120.

[0060] The top of the mounting bracket 200 refers to the uppermost part of the vertically extending mounting bracket 200, whose main function is to provide support for the prestressing application mechanism 300. The connecting plate 120 is part of the constant force support assembly 100, connecting to the rigid support plate 110 and serving as the connection interface for the mounting bracket 200. "Removable installation" means that the top of the mounting bracket 200 and the connecting plate 120 are connected in a non-permanent manner, allowing for easy connection and separation as needed. Specifically, this detachable installation method can be achieved through various structures. For example, a bolted connection can be used, fixing the top of the mounting bracket 200 to the connecting plate 120 with bolts and nuts, allowing for loosening the bolts when disassembly is required; a pin connection can also be used, allowing connection or separation by inserting or removing pins; or a snap-fit ​​or pin-type structure can be designed for quick locking and unlocking through simple mechanical operations. These connection methods all aim to provide a convenient and efficient means of assembly and disassembly.

[0061] Through the above technical solution, this system significantly improves the efficiency of installation, adjustment, and disassembly of the prestressing application system within the insulation packing space 20 inside the cryogenic storage tank. This detachable connection method allows operators to quickly connect or disconnect the mounting bracket 200 from the constant force support component 100 as needed, thereby simplifying the system deployment and recovery process. Especially in confined working environments, this design avoids the operational inconveniences of traditional fixed connections, reduces construction difficulty and time costs, and improves the overall construction flexibility and safety. Furthermore, when the system requires maintenance, repair, or component replacement, the detachable design makes related operations more convenient, eliminating the need for large-scale disassembly of the entire system, thus effectively extending the equipment's service life and reducing maintenance costs.

[0062] Please continue reading 3 and... Figure 4 In an embodiment of the present invention, the connecting plate 120 is provided with a plurality of connecting holes 101, which extend radially along the cryogenic storage tank and are spaced apart in the horizontal direction. The mounting bracket 200 includes a mounting bracket body that extends vertically. A connecting port is provided at the top of the mounting bracket body, and the connecting port can be selectively connected to any of the connecting holes 101 via a connector.

[0063] Specifically, the connecting plate 120 is part of the aforementioned constant force support assembly 100, and its main function is to serve as the connection interface between the constant force support assembly 100 and the mounting bracket 200. Multiple connecting holes 101 are designed and formed on the connecting plate 120, providing multiple optional fixing points for the connection of the mounting bracket 200. These connecting holes 101 can take various forms, such as circular holes, elliptical holes, or elongated slotted holes, and their size and shape should match the connecting parts used for subsequent connection to ensure the stability and reliability of the connection. To accommodate possible radial dimensional deviations or curvature changes in the inner tank wall plate 10, these connecting holes 101 are designed to extend radially along the cryogenic storage tank. This means that each connecting hole 101 has a certain length in the radial direction, allowing the connecting parts to slide or adjust within a small range in the radial direction, thereby enabling the mounting bracket 200 to be finely adjusted and positioned radially according to actual conditions during connection. Meanwhile, to further enhance installation flexibility, these connection holes 101 are spaced out in the horizontal direction, that is, multiple connection holes 101 are distributed in the width direction (or circumferential direction) of the connection plate 120. This spacing provides multiple connection options in the horizontal direction, allowing the connection position of the mounting bracket 200 to be adjusted in the horizontal direction to accommodate the irregularity of the inner tank wall plate 10 in the circumferential direction or installation requirements.

[0064] The main structure of the mounting bracket 200 is called the mounting bracket body. Its main function is to support the prestressing application mechanism 300 and the adsorption assembly 400, and to stably fix them to the inner side of the inner tank wall plate 10. The mounting bracket body is usually made of materials with sufficient strength and rigidity, such as high-strength steel or aluminum alloy, to ensure that it can withstand the corresponding loads without deformation during prestressing application. The mounting bracket body extends vertically, indicating that its main structure is vertical and parallel to the vertical seam of the inner tank wall plate 10. This design helps to apply prestress evenly to the vertical seam area and ensures the stability of the entire system. At the top of the mounting bracket body, a connection port is provided, which is a structure specifically designed to connect with the connection hole 101 on the connecting plate 120. This connection port can be in the form of a threaded hole, pin hole, slot, or mating boss, etc., and its design should match the connector and the connection hole 101 to achieve quick and reliable connection and disassembly. Using connectors such as bolts, pins, and quick connectors, the connection port on the top of the mounting bracket body can be flexibly selected to connect with any of the connection holes 101 on the connecting plate 120. This selectable connection method is the key to this embodiment, meaning that the installation position of the mounting bracket 200 is no longer single and fixed, but adjustable within a certain range.

[0065] Through the above technical solution, multiple connecting holes 101 extending radially and spaced horizontally are opened on the connecting plate 120, and the connecting port on the top of the mounting bracket body can be selectively connected to any connecting hole 101 through a connector. This system significantly improves the connection flexibility and adjustability between the mounting bracket 200 and the constant force support assembly 100. In actual installation, due to the possibility of certain dimensional deviations or local deformations in the manufacturing and installation of the inner tank wall plate 10 of the cryogenic storage tank, traditional fixed connection methods cannot guarantee that the prestressing application mechanism 300 can always be in the optimal state against the inner tank wall plate 10. However, this solution provides multiple adjustable connection options, allowing operators to accurately adjust the radial and horizontal positions of the mounting bracket 200 according to the actual position and curvature of the inner tank wall plate 10, thereby ensuring that the prestressing application mechanism 300 can apply prestress more accurately and evenly to the side of the inner tank wall plate 10 facing the inner tank liner. This precise positioning and adjustment capability not only optimizes the effect of prestressing application and effectively suppresses welding deformation, but also greatly simplifies the difficulty of on-site installation and commissioning, improves installation efficiency, and reduces the risk of uneven prestressing application due to improper installation.

[0066] Please continue reading 3 and... Figure 4In an embodiment of the present invention, the adsorption assembly 400 includes a suction nozzle 410 and an air pipe 420. The suction nozzle 410 extends radially along the cryogenic storage tank and is mounted on the bottom end of the mounting bracket 200. One end of the air pipe 420 is connected to the suction nozzle 410, and the other end of the air pipe 420 is connected to an external air configuration mechanism. The air pipe 420 is used to draw or supply air to the suction nozzle 410, thereby causing the suction nozzle 410 to adsorb or detach from the bottom area of ​​the inner tank wall plate 10 facing the inner tank liner.

[0067] The suction nozzle 410 extends radially along the cryogenic storage tank and is mounted at the bottom of the mounting bracket 200. As the core component directly contacting the inner tank wall 10 and performing the adsorption function, the radially extended design of the suction nozzle 410 helps increase the contact area with the inner tank wall 10, thereby providing stronger adsorption force and better adapting to the curvature of the inner tank wall 10, ensuring the stability and reliability of adsorption. One end of the air pipe 420 is connected to the suction nozzle 410, and the other end is connected to an external air distribution mechanism. This air pipe 420 is a pneumatic connection channel that enables the adsorption assembly 400 to function; it is responsible for transmitting the air pressure or vacuum generated by the external air distribution mechanism (e.g., a vacuum pump or air pump) to the suction nozzle 410. Through the air pipe 420, air can be drawn from or supplied to the suction nozzle 410 to correspondingly adsorb or detach from the bottom area of ​​the inner tank wall 10 facing the inner tank liner. Specifically, when adsorption is required, the external air supply mechanism draws air into the inside of the suction nozzle 410 through the air pipe 420 to create a negative pressure, so that the suction nozzle 410 is firmly adsorbed onto the inner tank wall plate 10; when detachment is required, air is supplied into the inside of the suction nozzle 410 through the air pipe 420 to release the negative pressure and separate the suction nozzle 410 from the inner tank wall plate 10.

[0068] Through the above technical solution, the adsorption component 400 adopts a pneumatic adsorption method to achieve a reliable and controllable connection between the bottom of the mounting bracket 200 and the inner tank wall plate 10. This adsorption method avoids the operational complexity or damage to the wall plate surface that may be caused by traditional mechanical fixing, and is especially suitable for the confined operating environment within the cold insulation filler filling space 20. The radial extension design of the suction nozzle 410 ensures sufficient adsorption area and adaptability to the curvature of the wall plate, thus providing stable fixed support. The cooperation between the air piping 420 and the external air configuration mechanism enables remote and accurate control of the adsorption and detachment processes, greatly improving the system's installation efficiency and operational convenience. This stable and controllable bottom fixing effectively ensures the stability and accuracy of the prestressing application mechanism 300 and the constant force support component 100 in applying prestress to the inner tank wall plate 10 during the welding process, thereby more effectively suppressing the welding deformation of the cryogenic storage tank wall plate and improving welding quality and construction efficiency.

[0069] Please continue reading 3 and... Figure 4In an embodiment of the present invention, the suction nozzle 410 includes an adsorption pad 411 and an installation tube 412. The installation tube 412 is installed at the bottom end of the installation bracket 200, and the adsorption pad 411 is installed at one end of the installation tube 412. The adsorption pad 411 is disposed in the bottom area of ​​the inner tank wall plate 10. An adsorption space is formed between the adsorption pad 411 and the side of the inner tank wall plate 10 facing the inner tank liner. One end of the air pipe 420 is connected to the adsorption space through the other end of the installation tube 412. The air pipe 420 is used to draw air or supply air to the adsorption space, thereby causing the adsorption pad 411 to adsorb or detach from the bottom area of ​​the inner tank wall plate 10 facing the inner tank liner.

[0070] Specifically, the suction nozzle 410 is the core component of the adsorption assembly 400, and its structural design is crucial for achieving reliable adsorption. The adsorption pad 411 is a flexible component that directly contacts the inner tank wall plate 10 and forms a seal, while the mounting tube 412 is responsible for fixing the adsorption pad 411 to the mounting bracket 200 and providing a gas passage. As a connector, the mounting tube 412 firmly fixes the adsorption pad 411 to the bottom of the mounting bracket 200, ensuring that the adsorption assembly 400 can be stably positioned and operated during adsorption and detachment. The mounting tube 412 can be connected to the mounting bracket 200 by bolts, welding, or snap-fit ​​to ensure sufficient mechanical strength. The adsorption pad 411 is typically made of a material with good flexibility and sealing properties, such as rubber, silicone, or other elastic polymers. It is installed at the end of the mounting tube 412, allowing the adsorption pad 411 to directly contact the inner tank wall plate 10. The adsorption pad 411 is accurately placed in the bottom area of ​​the inner tank wall plate 10 because this area is typically a structurally stable location that facilitates adsorption operations. By placing the adsorption pad 411 in this area, a stable bottom support point can be provided for the entire mounting bracket 200. The edge of the adsorption pad 411 is tightly fitted to the surface of the inner tank wall 10, forming a relatively closed cavity, i.e., the adsorption space, between its interior and the inner tank wall 10. The formation of this space is the basis for generating negative pressure through air extraction. The air pipe 420 is the channel for gas transmission. One end of it is connected to the external air distribution mechanism, and the other end is connected to the adsorption space formed inside the adsorption pad 411 through a channel inside the mounting pipe 412 or an interface connected to the mounting pipe 412. This connection method ensures that the air distribution mechanism can effectively extract or supply air to the adsorption space. When the air pipe 420 extracts air into the adsorption space, a negative pressure is formed in the adsorption space, and the external atmospheric pressure presses the adsorption pad 411 tightly against the inner tank wall 10, thereby achieving adsorption and fixation. When detachment is required, the air pipe 420 supplies air to the adsorption space, releasing the negative pressure and allowing the adsorption pad 411 to separate from the inner tank wall 10.

[0071] Through the above technical solution, the suction nozzle 410 of the adsorption assembly 400 is specifically designed to include an adsorption pad 411 and an installation tube 412. The flexible material of the adsorption pad 411 allows it to better conform to any curvature or slight unevenness that may exist in the inner tank wall panel 10, thereby forming a stable and sealed adsorption space between the adsorption pad 411 and the inner tank wall panel 10. The air pipe 420 is connected to this adsorption space through the installation tube 412, which can efficiently evacuate the adsorption space, quickly establish and maintain sufficient negative pressure, and ensure that the adsorption pad 411 can be firmly adsorbed on the bottom area of ​​the inner tank wall panel 10. This structural design significantly improves the reliability and stability of adsorption, allowing the mounting bracket 200 to be firmly fixed on the inner tank wall panel 10, providing a solid foundation support for the prestressing application mechanism 300, thereby ensuring the accuracy and stability of the entire prestressing application system when applying prestress to the vertical joint area and effectively suppressing welding deformation. At the same time, adsorption can be quickly released by supplying air to the adsorption space, improving the system's operating efficiency and convenience.

[0072] This invention also proposes a prestressing method for suppressing welding deformation of cryogenic storage tank wall panels, using the prestressing system for suppressing welding deformation of cryogenic storage tank wall panels as described above. The prestressing method for suppressing welding deformation of cryogenic storage tank wall panels includes: Step S10: Move the prestressing application system for suppressing welding deformation of the cryogenic storage tank wall to the target position, so that the constant force support assembly 100 abuts against the side of the inner tank wall 10 away from the inner tank liner, and align the adsorption assembly 400 with the bottom area of ​​the inner tank wall 10 facing the inner tank liner. Step S20: Control the adsorption component 400 to perform adsorption operation to fix the bottom end of the mounting bracket 200 to the inner tank wall plate 10. At the same time, the prestressing mechanism 300 is squeezed by the inner tank wall plate 10, so that the prestressing mechanism 300 presses against and applies a preset prestress to the side of the inner tank wall plate 10 facing the inner tank liner. Step S30: While maintaining the prestressing application mechanism 300 and the constant force support assembly 100 in coordinating the force applied to the inner tank wall plate 10, the vertical seam is welded. Step S40: After welding is completed, the prestressing system for suppressing welding deformation of the cryogenic storage tank wall is removed from the cold insulation filler filling space 20.

[0073] It should be understood that the prestressing application method for suppressing welding deformation of cryogenic storage tank wall plates uses the prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described above. The specific structure of the prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates refers to the above embodiments. Since the prestressing application method for suppressing welding deformation of cryogenic storage tank wall plates adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0074] Specifically, firstly, the prestressing system for suppressing welding deformation of the cryogenic tank wall is moved to the target position, so that the constant force support assembly 100 abuts against the side of the inner tank wall 10 away from the inner tank liner, and the adsorption assembly 400 is aligned with the bottom area of ​​the inner tank wall 10 facing the inner tank liner. This step aims to accurately deploy the prestressing system to the vertical seam area to be welded. The movement operation can be completed using lifting equipment (such as overhead cranes or hoists) in conjunction with a guiding device to ensure that the system is accurately positioned radially and vertically along the cryogenic tank. Here, "target position" means that the system can cover the entire height of the vertical seam to be welded, and the constant force support assembly 100 can be in close contact with the outer surface of the inner tank wall 10, and the adsorption assembly 400 can be aligned with the inner bottom area of ​​the inner tank wall 10, preparing for subsequent adsorption fixing and prestressing application.

[0075] Secondly, the adsorption assembly 400 is controlled to perform an adsorption operation to fix the bottom end of the mounting bracket 200 to the inner tank wall plate 10. Simultaneously, the prestressing mechanism 300 is pressed against the inner tank wall plate 10, applying a preset prestress to the side of the inner tank wall plate 10 facing the inner tank liner. The constant force support assembly 100 provides corresponding support force on the side of the inner tank wall plate 10 away from the inner tank liner, forming a prestress distribution opposite to the expected welding deformation trend in the wall plate area on both sides of the vertical joint. This step is the core of prestressing application. The adsorption assembly 400 is controlled to perform an adsorption operation, for example, by drawing air into the adsorption space within the suction nozzle 410 through the air pipe 420 to create a negative pressure, causing the adsorption pad 411 to firmly adhere to the inner bottom area of ​​the inner tank wall plate 10, thereby reliably fixing the bottom end of the mounting bracket 200. Since the top of the mounting bracket 200 is connected to the top of the constant force support assembly 100, the entire system forms a stable frame after the adsorption assembly 400 is fixed. At this time, the prestressing application mechanism 300 (e.g., through the elastic action of the constant force spring) is automatically or passively squeezed by the inner tank wall plate 10, causing its flexible extrusion plate 310 to press against the inner side of the inner tank wall plate 10 and apply a preset prestress. The magnitude and distribution of this prestress can be pre-calculated and determined according to the welding process parameters and the wall plate thickness. At the same time, the constant force support assembly 100 (e.g., through the self-weight and structural stiffness of its counterweight 130 and rigid support plate 110) provides a reverse support force on the outer side of the inner tank wall plate 10, forming a synergistic effect with the prestressing application mechanism 300, and together they establish a prestress field in the wall plate area on both sides of the vertical joint that is opposite to the welding deformation trend, effectively counteracting the shrinkage and deformation caused by welding.

[0076] Next, the vertical seam is welded while maintaining the coordinated force application of the prestressing application mechanism 300 and the constant force support assembly 100 on the inner tank wall plate 10. This step emphasizes that the prestressing application system must operate continuously and effectively throughout the welding process. This means that the prestressing application mechanism 300 and the constant force support assembly 100 need to maintain a stable force on the inner tank wall plate 10 to ensure that the prestress field is always present during the welding thermal cycle. This can be achieved through the constant elasticity characteristics of the constant force spring and the stable structure of the constant force support assembly 100. The welding operation can be carried out using conventional automatic or semi-automatic welding methods, with the welding personnel or equipment completing the connection of the vertical seam under the protection of the prestressing system.

[0077] Finally, after welding is completed, the prestressing system for suppressing welding deformation of the cryogenic tank wall is removed from the insulation filler space 20. After welding, the prestress can be released once the weld has cooled to a certain temperature. First, the adsorption assembly 400 is controlled to perform a release operation, for example, by supplying air to the adsorption space within the suction nozzle 410 through the air pipe 420 to release the negative pressure and separate the adsorption pad 411 from the inner tank wall 10. Subsequently, the entire prestressing system can be safely lifted or removed from the insulation filler space 20 to prepare for the construction of the next welding section.

[0078] Through the above method, this application can effectively suppress welding deformation of the inner tank wall plate 10 of a cryogenic storage tank. Before welding, the system is accurately deployed and fixed to ensure that the prestressing application mechanism 300 and the constant force support component 100 can work together to form a prestress distribution in the vertical joint area that is opposite to the expected welding deformation trend. This prestress persists during the welding process, effectively offsetting the material shrinkage and deformation caused by welding heat input, thereby significantly reducing defects such as warping and wavy deformation of the wall plate after welding, and ensuring the geometric accuracy and structural integrity of the inner tank wall plate 10. In addition, this method, through the fixing and releasing of the adsorption component 400, enables rapid deployment and removal of the system, improves construction efficiency, reduces the risk of manual intervention, and provides a reliable deformation control means for the construction of cryogenic storage tanks.

[0079] The following example will provide a more detailed explanation of the above technical solution: In the construction of large full-containment liquefied natural gas (LNG) storage tanks, when it is necessary to weld the vertical seam between two adjacent inner tank wall plates 10, a prestressing system can be applied to effectively suppress the deformation generated during the welding process.

[0080] First, the prestressing system is moved to the target welding area. At this point, the constant force support assembly 100 of the system is positioned on the side of the inner tank wall panel 10 to be welded, away from the inner tank liner, and abuts against the wall panel. The constant force support assembly 100 extends vertically and is positioned close to the vertical seam. Specifically, the constant force support assembly 100 may include a vertically extending rigid support plate 110, the bottom end of which is connected to a counterweight 130 to provide stable support force. The top end of the rigid support plate 110 is bent radially outward from the cryogenic storage tank to form a connecting section, and a flexible buffer pad is provided between the rigid support plate 110 and the inner tank wall panel 10 to protect the wall panel surface and uniformly transmit force.

[0081] Simultaneously, the adsorption assembly 400 of the system is aligned with the bottom region of the inner tank wall panel 10 facing the inner tank liner. The adsorption assembly 400 may include a suction nozzle 410 extending radially along the cryogenic storage tank, with an adsorption pad 411 and an installation tube 412 inside the nozzle 410. An adsorption space is formed between the adsorption pad 411 and the inner tank wall panel 10, and the space is connected to an external air supply mechanism via an air piping 420.

[0082] Next, the adsorption assembly 400 is controlled to perform the adsorption operation. The external air configuration mechanism draws air into the adsorption space through the air pipe 420, so that the adsorption pad 411 is firmly adsorbed onto the bottom area of ​​the inner tank wall plate 10 facing the inner tank liner, thereby fixing the bottom end of the mounting bracket 200 to the inner tank wall plate 10.

[0083] The mounting bracket 200 extends vertically and is positioned within the insulation filler 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 via a connecting plate 120. The connecting plate 120 has multiple connecting holes 101 extending radially along the cryogenic storage tank. The top of the mounting bracket body of the mounting bracket 200 has a connection port, which can be selectively connected to any of the connecting holes 101 via a connector, enabling a flexible and detachable connection between the mounting bracket 200 and the constant force support assembly 100.

[0084] While the adsorption assembly 400 is fixedly mounted on the bracket 200, the prestressing mechanism 300 is compressed by the inner tank wall plate 10. This prestressing mechanism 300 is located on the side of the bracket 200 facing the inner tank wall plate 10 and can extend and retract radially along the cryogenic storage tank. The prestressing mechanism 300 includes a vertically extending flexible compression plate 310 and a plurality of vertically spaced prestressing components 320. Each prestressing component 320 can extend and retract radially along the cryogenic storage tank and is composed of an inner tube 321, an outer tube 322, and a constant force spring. The inner tube 321 is mounted on the bracket 200, the outer tube 322 is slidably sleeved on the inner tube 321, one end of the outer tube 322 is connected to the flexible compression plate 310, and the constant force spring is disposed between the flexible compression plate 310 and the inner tube 321. The function of the constant force spring is to press the flexible extrusion plate 310 against the side of the inner tank wall plate 10 facing the inner tank liner, so that the flexible extrusion plate 310 adapts to the curvature of the inner tank wall plate 10, and applies a preset prestress to the inner tank wall plate 10 through the flexible extrusion plate 310.

[0085] During this process, the constant force support assembly 100 provides corresponding support force on the side of the inner tank wall plate 10 opposite to the inner tank liner. The constant force support assembly 100 cooperates with the prestressing application mechanism 300 to apply prestress to the inner tank wall plate 10 from both sides, acting on the vertical joint area. This coordinated force application creates a prestress distribution in the wall plate area on both sides of the vertical joint that is opposite to the expected welding deformation trend, effectively counteracting the deformation caused by the welding thermal cycle.

[0086] Compared to existing technologies that involve installing a large support frame inside the inner tank, this system arranges the prestressing application mechanism 300 and the mounting bracket 200 within the insulation filler space 20 between the inner tank wall plate 10 and the inner tank liner. This significantly frees up construction space inside the inner tank, allowing for smooth multi-process cross-operations and improving construction efficiency. Simultaneously, the quick-fix and detachable connection design of the adsorption component 400 simplifies the system's installation and disassembly process, reduces the frequency of operator work in confined, high-altitude environments, and lowers safety risks.

[0087] While maintaining the prestressing application mechanism 300 and the constant force support assembly 100 in coordinating the force applied to the inner tank wall plate 10, the vertical seam is welded. After welding, air is supplied to the suction nozzle 410 through the air pipe 420, causing the adsorption pad 411 to detach from the inner tank wall plate 10, thereby removing the prestressing application system that inhibits welding deformation of the cryogenic storage tank wall plate from the cold insulation filler filling space 20, completing the entire operation process.

[0088] 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 prestressing system for suppressing welding deformation of cryogenic storage tank wall panels, wherein the cryogenic storage tank wall panel 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 prestressing system for suppressing welding deformation of cryogenic storage tank wall plates includes: A constant force support assembly extends vertically and abuts against the side of the inner tank wall panel away from the inner tank liner. The constant force support assembly is located near the vertical joint. The mounting bracket extends vertically and is positioned within the cold insulation filler space corresponding to the position of the constant force support component. The top end of the mounting bracket is connected to the top end of the constant force support component. A prestressing mechanism is provided on the side of the mounting bracket facing the inner tank wall plate. The prestressing mechanism can extend and retract radially along the cryogenic storage tank. The prestressing mechanism is used to press against the side of the inner tank wall plate facing the inner tank liner. An adsorption component is disposed at the bottom end of the mounting bracket. The adsorption component is used to adsorb or detach from the bottom area of ​​the inner tank wall plate facing the inner tank liner.

2. The prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described in claim 1, 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.

3. The prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described in claim 2, 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.

4. The prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described in any one of claims 1 to 3, 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 away from 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, and the top end of the mounting bracket is connected to the connecting plate.

5. The prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described in claim 4, characterized in that, A flexible buffer pad is provided between the rigid support plate and the inner tank wall plate.

6. The prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described in claim 4, characterized in that, The top of the mounting bracket is detachably mounted to the connecting plate.

7. The prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described in claim 6, characterized in that, The connecting plate has multiple connecting holes, all of which extend radially along the cryogenic storage tank and are spaced apart 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.

8. The prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described in any one of claims 1 to 3, characterized in that, The adsorption assembly includes a suction nozzle and an air pipe. The suction nozzle extends radially along the cryogenic storage tank and is mounted on the bottom end of the mounting bracket. One end of the air pipe is connected to the suction nozzle, and the other end of the air pipe is connected to an external air supply mechanism. The air pipe is used to draw or supply air to the suction nozzle, thereby causing the suction nozzle to adsorb or detach from the bottom area of ​​the inner tank wall plate facing the inner tank liner.

9. The prestressing application system for suppressing welding deformation of cryogenic storage tank wall plates as described in claim 8, characterized in that, The suction nozzle includes an adsorption pad and an installation tube. The installation tube is installed at the bottom end of the mounting bracket, and the adsorption pad is installed at one end of the installation tube. The adsorption pad is disposed in the bottom area of ​​the inner tank wall plate. An adsorption space is formed between the adsorption pad and the side of the inner tank wall plate facing the inner tank liner. One end of the air pipe is connected to the adsorption space through the other end of the installation tube. The air pipe is used to draw air into or supply air to the adsorption space, thereby causing the adsorption pad to adsorb or detach from the bottom area of ​​the inner tank wall plate facing the inner tank liner.

10. A method for applying prestress to suppress welding deformation of cryogenic storage tank wall plates, characterized in that, The prestressing system for suppressing welding deformation of cryogenic storage tank wall panels as described in any one of claims 1 to 9, wherein the prestressing method for suppressing welding deformation of cryogenic storage tank wall panels comprises: Move the prestressing system for suppressing welding deformation of the cryogenic tank wall to the target position, so that the constant force support assembly abuts against the side of the inner tank wall away from the inner tank liner, and align the adsorption assembly with the bottom area of ​​the inner tank wall facing the inner tank liner. The adsorption assembly is controlled to perform an adsorption operation to fix the bottom end of the mounting bracket to the inner tank wall plate. At the same time, the prestressing mechanism is squeezed by the inner tank wall plate, so that the prestressing mechanism presses against and applies a preset prestress to the side of the inner tank wall plate facing the inner tank liner. While maintaining the coordinated force application of the prestressing mechanism and the constant force support assembly on the inner tank wall plate, the vertical seam is welded; After welding is completed, the prestressing system for suppressing welding deformation of the cryogenic tank wall is removed from the space filled with the insulation packing.

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