Liquefied natural gas (LNG) storage tank inner tank wall plate hoisting method and system

Abstract

The invention provides an LNG storage tank inner tank wall plate hoisting method and system.The hoisting method adopts combination of an electric hoist system and a truck crane system for hoisting and comprises the following steps that S1, the truck crane system is connected with a to-be-hoisted inner tank wall plate through a hoisting tool, and the inner tank wall plate is hoisted from a storage site and transported into the operation range of the electric hoist system; s2, the inner tank wall plate is lifted to a designated position within the operation range of the electric hoist system, and the electric hoist system is connected with the inner tank wall plate through a lifting appliance; s3, the truck crane system bears a part of weight of the inner tank wall plate, and coarse positioning of the inner tank wall plate is carried out; the electric hoist system bears the other part of weight of the inner tank wall plate, and the horizontal position, height and angle of the inner tank wall plate are accurately adjusted; and S4, the weight load of the inner tank wall plate is gradually transferred to the electric hoist system from the truck crane system, and after the weight load is transferred, the inner tank wall plate is accurately hoisted to a preset position, so that the inner tank wall plate is in place.

Description

Technical Field

[0001] The present invention relates to the technical field of LNG storage tank hoisting engineering construction, and specifically relates to a method and system for hoisting the inner tank wall plates of an LNG storage tank. Background Art

[0002] In the field of installing the inner tank wall plates of an LNG storage tank (liquefied natural gas storage tank), the commonly used methods for hoisting and installing the existing LNG storage tank inner tank include:

[0003] Method 1: Using manual operation with a chain block, and then cooperating with a crowbar jack, etc. for positioning and installation.

[0004] Method 2: Using a truck crane for hoisting, and then using a crowbar jack, etc. for positioning and installation.

[0005] Method 3: Using a winch for hoisting, and then using a hydraulic forklift and a chain block, etc. for positioning and installation.

[0006] Method 1 is applicable to some wall plates with small specifications and light weights. It requires multiple people for combined handling, with high costs, low efficiency, and high labor intensity.

[0007] Method 2 is applicable to an environment with open space and unobstructed paths, and the hoisting height is not high. It requires a large space and a foundation with sufficient strength to meet the standing position of the truck crane. The hoisting direction is difficult to control, a large-tonnage crane is needed, and it needs to be repositioned every time for hoisting. It requires multiple people to cooperate, with high costs and low efficiency.

[0008] For the winch hoisting in Method 3, it is necessary to weld anchor points and guide pulleys on the arch top, and then for each completed wall plate, the winch needs to be moved back and forth multiple times to adjust the direction. It lacks flexibility, has a high labor intensity, and is also insufficient in terms of safety. And it requires multiple people to cooperate, with high costs and low efficiency.

[0009] Currently, in the LNG storage tank installation project, for the hoisting of a large number of wall plates with non-concentrated installation positions, due to the heavy self-weight, large plate width, high precision requirements for positioning and installation, and large construction area of the inner tank wall plates, it is impossible to achieve the hoisting and installation of the inner tank wall plates by manpower. And for the hoisting and installation of the inner tank wall plates, vertical hoisting is required. Using the traditional method of transfer for the hoisting and installation of the inner tank wall plates, not only is the direction difficult to control during the hoisting process, lacking flexibility and being prone to bumping, but also the installation precision is low and requires repeated adjustment. Due to the limitation of the installation space, large cranes cannot enter the tank, so multiple people are needed to cooperate, with high costs, low efficiency,

[0010] a long construction period, and high labor intensity.

[0011] In view of this, the inventors of the present application have designed a method and system for hoisting the inner tank wall plates of an LNG storage tank in order to overcome the above technical problems. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the installation of wall panels in large quantities and at unconcentrated installation positions is involved in the LNG storage tank installation project. Due to the heavy weight of the inner tank wall panels themselves, the large panel width, the high installation accuracy requirements and the large construction area, the lifting and installation of the inner tank wall panels cannot be achieved by manpower. A method and system for lifting the inner tank wall panels of an LNG storage tank are provided.

[0013] The present invention solves the above technical problems through the following technical solutions:

[0014] The present invention provides a method for hoisting inner tank wall panels of LNG storage tanks, which is characterized in that the method for hoisting inner tank wall panels of LNG storage tanks adopts an electric hoist system combined with a car crane system for hoisting, and the hoisting method comprises the following steps: S1, connecting the car crane system with the inner tank wall panels to be hoisted through a hoist, and using the car crane system to hoist the inner tank wall panels from a storage location and hoisting them into the operating range of the electric hoist system; S2, the car crane system hoists the inner tank wall panels to a designated position within the operating range of the electric hoist system, and hoists the inner tank wall panels. The electric hoist system is connected to the inner tank wall panel through a hoist; S3, the automobile crane system bears a part of the weight of the inner tank wall panel to perform rough positioning of the inner tank wall panel; the electric hoist system bears another part of the weight of the inner tank wall panel to accurately adjust the horizontal position, height and angle of the inner tank wall panel; S4, the weight load of the inner tank wall panel is gradually transferred from the automobile crane system to the electric hoist system. After the weight load transfer is completed, the electric hoist system accurately lifts the inner tank wall panel to the predetermined position to achieve the position of the inner tank wall panel.

[0015] According to one or more embodiments of the present invention, step S4 further includes the following steps: S5, disconnecting the inner tank wall panel from the electric hoist system and the truck crane system, and repeating steps S1 to S5 to perform subsequent lifting of the inner tank wall panel.

[0016] According to one or more embodiments of the present invention, in step S4, when the inner tank wall panel reaches a predetermined position, the inner tank wall panel is fixed by a wall panel supporting device; when a plurality of the inner tank wall panels are assembled in place in sequence, the wall panel supporting device ensures the stability of the inner tank wall panel that has been hoisted, and provides an assembly reference for subsequent inner tank wall panels.

[0017] According to one or more embodiments of the present invention, the wall panel support device includes a support frame, a baffle, and a temporary welding fixture; one end of the support frame is connected to the inner tank wall panel, and the other end of the support frame is supported on the bottom plate, the baffle is arranged at the bottom of the inner tank wall panel, and the temporary welding fixture is installed at the joint of adjacent inner tank wall panels.

[0018] According to one or more embodiments of the present invention, the electric hoist system uses a 5T electric hoist, and the truck crane system uses a 25T crane.

[0019] According to one or more embodiments of the present invention, during the hoisting process, pulling ropes are arranged at both ends of the inner tank wall panel to be hoisted for pulling.

[0020] According to one or more embodiments of the present invention, the electric hoist system is equipped with a lifting and lowering control device for precisely controlling the lifting and lowering during the hoisting process.

[0021] According to one or more embodiments of the present invention, the electric hoist system adopts multi-point synchronous hoisting. Multiple lifting points are arranged on the inner tank wall panel to be hoisted for hoisting. Each lifting point is controlled by the above-mentioned lifting and lowering control device to precisely adjust the horizontal position, height, and angle of the hoisting for the butt joint of the inner tank wall panel.

[0022] According to one or more embodiments of the present invention, during the hoisting process, a total station and / or a rangefinder are used to measure and correct the horizontal position, height, and angle of the inner tank wall panel in real time.

[0023] According to one or more embodiments of the present invention, the electric hoist system includes multiple groups of lifting point tracks and electric hoists, and the lifting point tracks provide a moving path for the electric hoists.

[0024] The present invention also provides an inner tank wall panel hoisting system for an LNG storage tank, characterized in that the inner tank wall panel hoisting system for an LNG storage tank is used to implement the above-mentioned inner tank wall panel hoisting method for an LNG storage tank. The inner tank wall panel hoisting system for an LNG storage tank includes: an electric hoist system, a truck crane system, a lifting tool, and a wall panel support device.

[0025] The positive and progressive effects of the present invention are as follows:

[0026] The inner tank wall panel hoisting method of the present invention for an LNG storage tank has at least the following advantages:

[0027] First, the construction quality is improved:

[0028] The high-precision installation of the inner tank wall panel is realized. The splicing gap is uniform, and the flatness meets the acceptance specification, meeting the strict design requirements of the LNG storage tank.

[0029] The deformation and damage of the inner tank wall panel caused by multiple adjustments or improper hoisting in the traditional method are avoided.

[0030] Second, the construction efficiency is improved:

[0031] The method of combining an electric hoist system and a truck crane system simplifies the operation process, significantly reduces the construction period, and leaves more time for subsequent processes. It improves the utilization rate and operation efficiency of the equipment.

[0032] III. Enhanced safety performance:

[0033] Multi-point synchronous control and precise adjustment reduce the possibility of accidents and enhance the safety of hoisting operations. The technical requirements for operators are reduced, and human operation errors are minimized.

[0034] IV. Cost savings:

[0035] On the premise of ensuring quality, equipment rental and transportation costs are saved, and the total construction cost is reduced. The rework costs caused by construction errors or damage to the inner tank wall panels are reduced.

[0036] V. Reduced environmental impact:

[0037] Compared with large-scale mechanical equipment, electric hoists are more energy-saving and environmentally friendly, reducing energy consumption and noise pollution on site. The optimized hoisting process reduces the damage to the construction site caused by frequent equipment adjustment and transportation. Description of the drawings

[0038] The above-mentioned and other features, properties, and advantages of the present invention will become more apparent through the following description in conjunction with the drawings and embodiments. In the drawings, the same reference numerals always represent the same features, where:

[0039] Figure 1 is a schematic diagram of an embodiment of the method for hoisting the inner tank wall panels of an LNG storage tank according to the present invention.

[0040] Figure 2 is a schematic diagram of the connection of each structure in the working state of the inner tank wall panel hoisting system of the present invention.

[0041] Figure 3 is a schematic diagram of the coordination method of the method for hoisting the inner tank wall panels of the LNG storage tank according to the present invention.

[0042] Figure 4 is a top view schematic diagram of the wall panel support device in an embodiment of the method for hoisting the inner tank wall panels of the LNG storage tank according to the present invention.

[0043] Figure 5 is a side view schematic diagram of part A of the wall panel support device in an embodiment of the method for hoisting the inner tank wall panels of the LNG storage tank according to the present invention.

[0044] Figure 6 is a group-up schematic diagram of the inner tank wall panels in an embodiment of the method for hoisting the inner tank wall panels of the LNG storage tank according to the present invention.

[0045]

Reference numerals

[0046] Electric hoist system 100

[0047] Electric hoist 110

[0048] Hoisting point track 120

[0049] Truck crane system 200

[0050] Truck crane device 210

[0051] Truck chassis 220

[0052] Lifting tool 300

[0053] Lifting steel wire rope 310

[0054] Inner tank wall panel lifting lug 320

[0055] Inner tank wall panel 400

[0056] Spacer block 410

[0057] Wall panel support device 500

[0058] Support frame 510

[0059] Baffle plate 520

[0060] Temporary welding fixture 530

[0061] Pin 540 Specific implementation manners

[0062] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention is provided in conjunction with the accompanying drawings.

[0063] Now, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Now, preferred embodiments of the present invention will be described in detail, and examples thereof are shown in the drawings. In any possible case, the same reference numerals will be used throughout all the drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present invention not only through the actual terms used, but also through the meaning implied by each term.

[0064] See Figures 1 to 3 , the present invention provides a method for hoisting the inner tank wall panel of an LNG storage tank. The method for hoisting the inner tank wall panel of the LNG storage tank combines an electric hoist system 100 and a truck crane system 200 for hoisting. The hoisting method includes the following steps:

[0065] Step S1, connecting the truck crane system 200 to the inner tank wall panel 400 to be hoisted through the hoist 300, and using the truck crane system 200 to hoist the inner tank wall panel 400 from the storage location and hoisting it into the operating range of the electric hoist system 100;

[0066] Step S2, the vehicle crane system 200 lifts the inner tank wall plate 400 to a designated position within the operating range of the electric hoist system 100, and connects the electric hoist system 100 to the inner tank wall plate 400 through the lifting device 300;

[0067] Step S3, the truck crane system 200 bears a part of the weight of the inner tank wall plate 400 to roughly position the inner tank wall plate 400; the electric hoist system 100 bears another part of the weight of the inner tank wall plate 400 to accurately adjust the horizontal position, height and angle of the inner tank wall plate 400;

[0068] Step S4, gradually transfer the weight load of the inner tank wall panel 400 from the automobile crane system 200 to the electric hoist system 100. After the weight load transfer is completed, the electric hoist system 100 accurately lifts the inner tank wall panel 400 to a predetermined position to achieve the inner tank wall panel 400 in place.

[0069] Preferably, the hook of the automobile lifting system 200 is directly connected to the inner tank wall panel 400 through a lifting fixture 300 (such as a clamp or a lifting ring), which plays the role of lifting and preliminary positioning. The design of the lifting fixture 300 ensures uniform distribution of the lifting force according to the shape of the inner tank wall panel 400 to prevent excessive local force.

[0070] Preferably, the truck crane system 200 lifts the inner tank wall panel 400 into the operating range of the electric hoist system 100, and the electric hoist system 100 takes over the inner tank wall panel 400 through the slide rail system of its lifting point track 120. During the handover process, the truck crane system 200 is responsible for rough positioning, and the electric hoist system 100 realizes precise adjustment. In the initial stage of lifting, the truck crane system 200 bears most of the lifting load; when the inner tank wall panel 400 is handed over to the electric hoist system 100, the load is gradually transferred to the electric hoist system 100.

[0071] Preferably, the hook of the electric hoist system 100 grabs the inner tank wall plate 400 through a special clamp, and the clamp is interchangeable with the lifting fixture 300 of the automobile lifting system 200 during the lifting and handover process. The electric hoist system 100 is usually provided with multiple lifting points, and the inner tank wall plate 400 is connected through multiple clamps to disperse the force and prevent deformation caused by excessive force at a single point.

[0072] The LNG storage tank inner tank wall panel hoisting method of the present invention adopts a hoisting method combining an electric hoist system 100 and a truck hoist system 200, which effectively solves the problems of the prior art. The advantages of the hoisting method of the present invention are mainly reflected in the following aspects:

[0073] I. Complementary advantages of lifting equipment:

[0074] The electric hoist system 100 is suitable for precise lifting operations in narrow spaces. It has a compact structure and flexible operation, and can move along a specific path through rails or suspension methods to meet the precise lifting requirements of the inner tank wall panel 400.

[0075] The truck crane system 200 has strong lifting capacity and is suitable for the initial lifting and transportation of the inner tank wall panel 400, lifting the heavy inner tank wall panel 400 into the working range of the electric hoist system 100.

[0076] Combined use can avoid the limitations of a single device, ensuring both lifting capacity and improving precision and flexibility.

[0077] II. Precise positioning and synchronous operation:

[0078] The electric hoist system 100 can be equipped with precise lifting and lowering control systems, suitable for multi-point synchronous lifting, which can avoid deformation of the inner tank wall panel 400 caused by excessive single-point stress.

[0079] When working in coordination with the truck crane system 200, the height and angle of the inner tank wall panel 400 can be slowly adjusted through the electric hoist system 100 to complete high-precision positioning, thus ensuring the flatness and splicing quality of the inner tank wall panel 400.

[0080] III. Improving construction efficiency:

[0081] The combined use of the electric hoist system 100 and the truck crane system 200 reduces the time for repeated adjustment of a single device and optimizes the construction process. In a limited space, the electric hoist 110 can move along the rails, avoiding the need to frequently change the position of the equipment.

[0082] IV. Enhancing construction safety:

[0083] Multi-point synchronous lifting reduces the risk of stress concentration during the lifting process and decreases the possibility of damage to the inner tank wall panel 400. It can better control the dynamic stability during the lifting process and reduces the risk of the lifting equipment tipping over or operating errors.

[0084] V. Reducing construction costs:

[0085] The purchase or rental cost of the electric hoist equipment is relatively low, and its energy consumption is less than that of large mechanical lifting equipment. By optimizing construction efficiency and reducing equipment maintenance requirements, the overall project cost is significantly reduced.

[0086] Preferably, the truck crane system 200 uses a small-tonnage truck crane. The truck crane is used to vertically lift the inner tank wall panel 400 from the storage location and then slowly move it into the working range of the electric hoist system 100.

[0087] When the inner tank wall panel 400 reaches the designated position, the electric hoist 110 participates in the hoisting operation and further hoists the inner tank wall panel 400 to the installation position. During this process, the truck crane still bears the weight to assist in adjusting the attitude of the inner tank wall panel 400.

[0088] With the cooperation of the truck crane and the electric hoist 110, the inner tank wall panel 400 is slowly moved to the installation position. By finely adjusting the positions of the electric hoist 110 and the truck crane, the precise docking of the inner tank wall panel 400 is achieved.

[0089] It should be noted that the hoisting method for the inner tank wall panel of the LNG storage tank of the present invention is a hoisting method that combines the electric hoist system 100 with the truck crane system 200. The truck crane system 200 is used to control the hoisting process to ensure that the hoisted object is smoothly hoisted into the operation range of the electric hoist system 100. The electric hoist system 100 simultaneously coordinates with the truck crane system 200 to further hoist the inner tank wall panel 400 to the installation position.

[0090] The hoisting method for the inner tank wall panel of the LNG storage tank of the present invention solves the problem of difficult hoisting at the construction site, achieving both production and construction without interference. It not only ensures the construction quality but also greatly reduces various risks existing in high-altitude operations. The construction machinery used in the hoisting method of the present invention is simple, has strong site adaptability, fast hoisting speed, large tonnage, and saves mechanical costs, and is suitable for hoisting and installing the large-volume inner tank wall panel 400 of the LNG storage tank.

[0091] The hoisting method for the inner tank wall panel of the LNG storage tank of the present invention is flexible in operation, safe and reliable, reduces secondary adjustment, improves the safety and accuracy of hoisting the inner tank wall panel 400 into place, and at the same time improves the hoisting efficiency, reduces labor and labor intensity, reduces safety risks, shortens the construction period, greatly reduces the labor input cost, successfully solves the drawbacks brought by traditional truck cranes and winches, and has good green environmental protection benefits, social benefits and economic benefits.

[0092] The hoisting method for the inner tank wall panel of the LNG storage tank of the present invention solves the deficiencies existing in the hoisting process of the inner tank wall panel 400 and provides a new idea for solving the hoisting and installation problems of large-tonnage and large-size steel plates in narrow and restricted spaces. The greatest advantage of using the electric hoist system 100 in combination with the truck crane system 200 is that it can ensure the synchronous operation of several lifting points during the horizontal transportation and vertical lifting of the equipment, and only one person is required to control and operate the electric hoist 110 on the ground, thus eliminating the safety hazards caused by a large number of people crowding in a small space or at high altitude. It makes the construction more convenient and safe; makes the quality more precise; reduces the safety hazards while reducing the labor force and improving the work efficiency, and essentially improves safety.

[0093] As a preferred embodiment of the method for hoisting the inner tank wall plate of the LNG storage tank of the present invention, the following steps are further included after the step S4:

[0094] Step S5: Disconnect the inner tank wall plate 400 from the electric hoist system 100 and the truck crane system 200, and repeat the steps S1 to S5 to perform the hoisting of the subsequent inner tank wall plates 400.

[0095] See Figures 4 - 6 , as a preferred embodiment of the method for hoisting the inner tank wall plate of the LNG storage tank of the present invention, in the step S4, when the inner tank wall plate 400 reaches the predetermined position, the inner tank wall plate 400 is fixed by the wall plate support device 500; when multiple inner tank wall plates 400 are assembled in place in sequence, the wall plate support device 500 ensures the stability of the hoisted inner tank wall plates 400 and provides an assembly reference for the subsequent inner tank wall plates 400 at the same time.

[0096] It should be noted that after the inner tank wall plate 400 is hoisted to the predetermined position, the inner tank wall plate 400 is fixed by the wall plate support device 500. The wall plate support device 500 includes a support frame 510, and the support frame 510 is connected to the internal structure of the storage tank. When multiple inner tank wall plates 400 are assembled in sequence, the wall plate support device 500 can ensure the stability of the hoisted inner tank wall plates 400 and provide an assembly reference for the subsequent inner tank wall plates 400 at the same time.

[0097] See Figures 4 - 6 , as a preferred embodiment of the method for hoisting the inner tank wall plate of the LNG storage tank of the present invention, the wall plate support device 500 includes a support frame 510, a baffle 520, and a temporary welding fixture 530; one end of the support frame 510 is connected to the inner tank wall plate, the other end of the support frame 510 is supported on the bottom plate, the baffle 520 is arranged at the bottom of the inner tank wall plate, and the temporary welding fixture 530 is installed at the butt joint of the adjacent inner tank wall plates.

[0098] Preferably, see Figure 5 , the baffle 520 is arranged on the front and rear sides of the bottom of the inner tank wall plate. One side of the baffle 520 is in direct contact with the inner tank wall plate and abuts against the inner tank wall plate, and there is a gap between the other side of the baffle 520 and the inner tank wall plate. A pin 540 can be arranged in the gap to limit the inner tank wall plate.

[0099] It should be noted that after the inner tank wall plate 400 is installed in place, it is temporarily fixed. The support frame 510 is preferably a diagonal brace. Figure 5The figure shows the assembly schematic of the first inner tank wall plate 400 at the bottom. The first inner tank wall plate 400 is temporarily connected to the bottom plate by diagonal braces, and the verticality of the inner tank wall plate 400 is adjusted by the diagonal braces. Preferably, 8 - 10 diagonal braces are arranged for each inner tank wall plate 400, respectively arranged at the positions 1 m from both side plate ends and evenly divided at the plate center. The length of the diagonal brace is about 1.2 m, and it is spot welded at 45°. After all the devices for fixing (such as temporary welding fixtures 530, baffles 520, support frames 510, etc.) on the inner tank wall plate 400 are firmly fixed, the hook of the lifting system can be removed.

[0100] The overall assembly schematic of the inner tank wall plate 400 is as Figure 6 shown. The hoisting and installation sequence of the remaining inner tank wall plates 400 is as follows: all the vertical seams of the first inner tank wall plate 400 need to be welded completely. After the radius, verticality, and levelness meet the design requirements, the hoisting and installation of the second inner tank wall plate 400 are allowed. After more than half of the vertical seams of the second inner tank wall plate 400 are welded, the circumferential seam gap between the first and second circles is adjusted, and after being inspected and qualified, it is fixed. After 3 pieces of the second inner tank wall plate 400 are hoisted and installed, the installation condition of the vertical seams of this layer is met. Installation of the next circle is carried out in the area where the vertical and circumferential seams have been welded, and then in sequence until all the inner tank wall plates 400 are hoisted and installed. The weld seams of the inner tank wall plate 400 are assembled and installed using temporary welding fixtures 530, and according to the on - site welding situation, all the temporary welding fixtures 530 are removed after the welding is completed.

[0101] As a preferred embodiment of the hoisting method of the inner tank wall plate of the LNG storage tank in the present invention, the electric hoist system 100 uses a 5T electric hoist, and the truck crane system 200 uses a 25T crane.

[0102] It should be noted that for the first 3 inner tank wall plates of the LNG storage tank, due to their own weight and large plate width, it is preferably to use a 5T electric hoist and a 25T crane in cooperation for hoisting and installation.

[0103] As a preferred embodiment of the hoisting method of the inner tank wall plate of the LNG storage tank in the present invention, during the hoisting process, pulling ropes are set at both ends of the hoisted inner tank wall plate 400 for pulling.

[0104] It should be noted that when hoisting the inner tank wall plate 400, pulling ropes are respectively set at both ends of the inner tank wall plate 400 for pulling to prevent the inner tank wall plate 400 from colliding with the already installed inner tank wall plates and other components or equipment.

[0105] As a preferred embodiment of the hoisting method of the inner tank wall plate of the LNG storage tank in the present invention, the electric hoist system 100 is equipped with a lifting control device for precisely controlling the lifting and lowering during the hoisting process.

[0106] As a preferred embodiment of the method for hoisting the inner tank wall plate of the LNG storage tank of the present invention, the electric hoist system 100 adopts multi-point synchronous hoisting. A plurality of lifting points are set on the inner tank wall plate 400 to be hoisted for hoisting, and each lifting point is controlled by the lifting control device to accurately adjust the horizontal position, height and angle of the hoisting, so as to carry out the docking of the inner tank wall plate 400.

[0107] It should be noted that the electric hoist system 100 is equipped with an accurate lifting control device, which is suitable for multi-point synchronous hoisting and can avoid the deformation of the inner tank wall plate 400 caused by excessive single-point stress. When working in cooperation with the truck crane system 200, the height and angle of the inner tank wall plate 400 can be slowly adjusted by the electric hoist 110 to complete high-precision positioning, so as to ensure the flatness and splicing quality of the inner tank wall plate 400.

[0108] As a preferred embodiment of the method for hoisting the inner tank wall plate of the LNG storage tank of the present invention, during the hoisting process, a total station and / or a rangefinder are used to measure and correct the horizontal position, height and angle of the inner tank wall plate 400 in real time.

[0109] It should be noted that due to the extremely high positioning accuracy requirements for the hoisting of the inner tank wall plate 400, and the electric hoist system 100 and the truck crane system 200 are responsible for different hoisting stages respectively, how to achieve seamless connection is a difficult problem. If the positioning process is not precise enough, it may lead to uneven splicing gaps or misalignment of the inner tank wall plate 400, affecting the sealing performance and safety of the storage tank.

[0110] Therefore, in the hoisting operations of the electric hoist system 100 and the truck crane system 200 of the method for hoisting the inner tank wall plate of the LNG storage tank of the present invention, auxiliary equipment such as a total station and a rangefinder are used to measure and correct the position of the inner tank wall plate 400 in real time. First, the truck crane system 200 is used to complete large-range rough positioning, and then high-precision positioning is achieved through the precise lifting and multi-point adjustment of the electric hoist system 100. In this way, the problem of poor connection between the two devices can be effectively avoided.

[0111] As a preferred embodiment of the method for hoisting the inner tank wall plate of the LNG storage tank of the present invention, the electric hoist system 100 includes multiple groups of lifting point tracks 120 and electric hoists 110, and the lifting point tracks 120 provide a moving path for the electric hoists 110.

[0112] It should be noted that due to the narrow construction space inside the LNG storage tank, the boom length and operating range of the truck crane device 210 are limited, and the lifting point settings of the electric hoist 110 are also limited by the tank body structure. There may be a problem that the truck crane device 210 is difficult to accurately hoist the inner tank wall plate 400 to the lifting position of the electric hoist 110, or the electric hoist 110 cannot achieve multi-point hoisting due to insufficient lifting points.

[0113] Therefore, multiple groups of temporary lifting point tracks 120 are arranged inside the storage tank for the flexible movement of the electric hoist 110. At the same time, the lifting range of the truck crane device 210 is reasonably planned. The lifting path is simulated and optimized to ensure that the truck crane system 200 can accurately deliver the inner tank wall panel 400 to the lifting position of the electric hoist 110, reducing multiple adjustments and tests.

[0114] See Figures 1 to 3 , the present invention also provides an inner tank wall panel lifting system for an LNG storage tank. The inner tank wall panel lifting system for an LNG storage tank is used to implement the above-mentioned inner tank wall panel lifting method for an LNG storage tank. The inner tank wall panel lifting system for an LNG storage tank includes: an electric hoist system 100, a truck crane system 200, a lifting tool 300, and a wall panel support device 500.

[0115] Preferably, the truck crane system 200 includes a truck crane device 210 and a truck chassis 220. The truck crane device 210 is arranged on the truck chassis 220. The hook of the truck crane device 210 is directly connected to the inner tank wall panel 400 through a lifting tool 300 (such as a fixture or a lifting ring), playing the role of lifting and preliminary positioning. The design of the lifting tool 300 ensures uniform distribution of the lifting force according to the shape of the inner tank wall panel 400, preventing excessive local stress.

[0116] Preferably, the electric hoist system 100 includes an electric hoist 110 and a lifting point track 120. The electric hoist system 100 is arranged on the lifting point track 120 and can move on the lifting point track 120. The truck crane system 200 lifts the inner tank wall panel 400 into the working range of the electric hoist 110, and the electric hoist system 100 takes over the inner tank wall panel 400 through the slide rail system of the lifting point track 120.

[0117] Preferably, the lifting tool 300 includes a lifting steel wire rope 310 and an inner tank wall panel lifting lug 320. The inner tank wall panel lifting lug 320 is arranged on the inner tank wall panel 400 as a lifting point, and the lifting steel wire rope 310 connects the inner tank wall panel lifting lug 320 with the truck crane device 210 and the electric hoist 110.

[0118] Preferably, the wall panel support device 500 includes a support frame 510, and the support frame 510 is connected to the internal structure of the storage tank. When multiple inner tank wall panels 400 are assembled in sequence, the wall panel support device 500 can ensure the stability of the already lifted inner tank wall panel 400 and at the same time provide an assembly reference for the subsequent inner tank wall panel 400.

[0119] Figure 2 The inner tank wall panel 400 to be lifted is placed separately through a spacer 410. The spacer 410 supports the inner tank wall panel 400 to prevent it from bending and deforming due to its own weight or external force, and the spacer 410 can prevent the surfaces of the inner tank wall panels 400 from contacting each other, reducing scratches and wear. The spacer 410 provides a gap, facilitating the insertion of the lifting tool 300 for connection and improving the operation efficiency.

[0120] See also Figure 3 When the LNG storage tank inner tank wall panel hoisting system of the present invention is used for hoisting, the coordination method of each component is as follows:

[0121] (1) Preliminary lifting of the truck crane system 200 and the inner tank wall panel 400

[0122] The initial lifting of the inner tank wall panel 400 is completed and sent to the operating range of the electric hoist 110. The truck crane system 200 is connected to the inner tank wall panel fixture through a hook to lift the inner tank wall panel 400 from the ground. During the lifting process, the operator uses the boom extension and boom rotation functions of the truck crane device 210 to accurately move the inner tank wall panel 400 to the receiving position of the electric hoist system 100. The truck crane system 200 bears the main load and maintains the stability of the inner tank wall panel 400 during lifting and transportation.

[0123] (2) Handover of hoisting loads between the electric hoist system 100 and the truck crane system 200

[0124] The load transfer of the inner tank wall panel 400 from the truck crane system 200 to the electric hoist system 100 is completed. When the truck crane system 200 lifts the inner tank wall panel 400 to the operating range of the electric hoist system 100, the hook and clamp of the electric hoist system 100 gradually take over the inner tank wall panel 400. The actions of the two devices are monitored in real time to ensure that the lowering speed of the boom of the truck crane device 210 is synchronized with the lifting speed of the electric hoist 110 to avoid uneven load or shaking of the inner tank wall panel 400. After the load transfer is completed, the truck crane system 200 withdraws from the operating area, and the electric hoist system 100 takes over the lifting task in full.

[0125] (3) Accurate positioning of electric hoist system 100

[0126] The electric hoist system 100 is used to realize the horizontal movement and precise positioning of the inner tank wall panel 400. The electric hoist 110 lifts the inner tank wall panel 400 to a predetermined height through a hook and a wire rope, and moves the inner tank wall panel 400 using a rail trolley of a slide rail of a hanging point rail 120. The slide rail system of the hanging point rail 120 is installed on the arch beam of the internal structure of the storage tank to ensure the stability and reliable support of the slide rail. The electric hoist system 100 gradually adjusts the lateral and longitudinal positions of the inner tank wall panel 400 according to the design position of the storage tank to complete precise positioning.

[0127] The overall coordination process of the LNG storage tank inner tank wall panel hoisting system of the present invention is as follows:

[0128] (1) Initial lifting: The truck crane system 200 lifts the inner tank wall panel 400 and delivers it to the range of the electric hoist system 100 to complete the initial transfer of the load.

[0129] (2) Load transfer: By coordinating the control of the truck crane system 200 and the electric hoist system 100, a smooth transfer of the load from the truck crane system 200 to the electric hoist system 100 is achieved.

[0130] (3) Precise adjustment: The electric hoist system 100 moves the inner tank wall panel 400 through the slide rail system of the lifting point track 120 and completes high-precision adjustment in combination with the locator.

[0131] (4) Temporary fixation: After the inner tank wall panel 400 is hoisted in place, it is fixed using the wall panel support device 500 to ensure its stability during the assembly process.

[0132] (5) Next cycle: Unload the electric hoist 110 from the inner tank wall panel 400 to prepare for the subsequent hoisting task of the inner tank wall panel 400.

[0133] The inner tank wall panel hoisting system of the present invention for LNG storage tanks forms an efficient and safe hoisting system through the combined use of the electric hoist system 100 and the truck crane system 200, with reasonable connection relationships and cooperation among various components, ensuring the safety, precision, and efficiency of the hoisting of the inner tank wall panel of the LNG storage tank.

[0134] The inner tank wall panel hoisting method and system of the present invention for LNG storage tanks do not require a separate traction device, anchor point, etc. for the stable support system when hoisting with the cooperation of the electric hoist system 100 and the truck crane system 200. This can reduce the time investment and manpower consumption for setting up rigging and related supporting equipment in the entire installation and hoisting project. The hoisting with the cooperation of the electric hoist system 100 and the truck crane system 200 is applicable to the hoisting of the inner tank wall panel 400 with a narrow construction site, a large lifting and hoisting weight, and a large span. The hoisting with the cooperation of the electric hoist system 100 and the truck crane system 200 can reduce the aisle laying, save a large amount of measure costs, and at the same time save the time for installation measures, and can quickly complete the equipment installation work. The hoisting with the electric hoist system 100 can reduce a large amount of manual work of traditional chain hoists. At the same time, after the electric hoist system 100 and the truck crane system 200 are interlocked and controlled, the inner tank wall panel 400 to be hoisted can be lifted synchronously, avoiding the tilting and uneven weight of the equipment caused by too many personnel and command errors. At the same time, there is no need for personnel to set up an aerial platform for operation anymore. Only one professional operator is required to cooperate with the hoisting operation on the ground, reducing the risk of aerial operations. At the same time, personnel operations can be far away from the hoisting area, improving the personal safety guarantee of personnel.

[0135] The inner tank wall panel hoisting method and system of the present invention for LNG storage tanks overcome the problems existing in the combined use of the electric hoist 110 and the truck crane device 210, achieving efficient cooperation of equipment, improved hoisting precision, optimized construction efficiency, and safety guarantee of equipment operation. This innovative solution is not only applicable to the construction of LNG storage tanks but also provides technical reference and practical experience for the hoisting of other large storage tanks and equipment.

[0136] In summary, the lifting method and system for the inner tank wall panel of the LNG storage tank of the present invention have the following many beneficial effects:

[0137] I. Improvement of construction quality:

[0138] The high-precision installation of the inner tank wall panel 400 is realized, the splicing gaps are uniform, and the flatness meets the acceptance specifications, meeting the strict design requirements of the LNG storage tank.

[0139] The deformation and damage of the inner tank wall panel 400 caused by multiple adjustments or improper lifting in the traditional method are avoided.

[0140] II. Improvement of construction efficiency:

[0141] The combination of the electric hoist system 100 and the truck crane system 200 simplifies the operation process, significantly reduces the construction period, and leaves more time for subsequent processes. The utilization rate of equipment and operation efficiency are improved.

[0142] III. Enhancement of safety performance:

[0143] Multi-point synchronous control and precise adjustment reduce the possibility of accidents and enhance the safety of the lifting operation. The technical requirements for operators are reduced, and human operation errors are decreased.

[0144] IV. Cost savings:

[0145] On the premise of ensuring quality, the equipment rental and transportation costs are saved, and the total construction cost is reduced. The rework costs caused by construction errors or damage to the inner tank wall panel 400 are decreased.

[0146] V. Reduction of environmental impact:

[0147] The electric hoist 110 is more energy-saving and environmentally friendly than large-scale mechanical equipment, reducing the energy consumption and noise pollution on site. The optimized lifting process reduces the damage to the construction site caused by frequent equipment adjustment and transportation.

[0148] Although the specific implementation manners of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for hoisting the inner tank wall panel of an LNG storage tank, characterized in that, The method for hoisting the inner tank wall panel of the LNG storage tank adopts a combination of an electric hoist system and a truck crane system for hoisting, and the hoisting method comprises the following steps: S1. Connect the truck crane system to the inner tank wall panel to be hoisted through a hoist, and use the truck crane system to hoist the inner tank wall panel from a storage location and hoist it into the operating range of the electric hoist system; S2, the truck crane system lifts the inner tank wall panel to a designated position within the operating range of the electric hoist system, and connects the electric hoist system to the inner tank wall panel through a lifting device; S3, the truck crane system bears part of the weight of the inner tank wall plate to perform rough positioning of the inner tank wall plate; the electric hoist system bears another part of the weight of the inner tank wall plate to accurately adjust the horizontal position, height and angle of the inner tank wall plate; S4, gradually transferring the weight load of the inner tank wall panel from the automobile crane system to the electric hoist system. After the weight load transfer is completed, the electric hoist system accurately lifts the inner tank wall panel to a predetermined position to put the inner tank wall panel in place.

2. The hoisting method of the inner tank wall plate of the LNG storage tank according to claim 1, characterized in that, The step S4 further includes the following steps: S5, disconnecting the inner tank wall panel from the electric hoist system and the truck crane system, and repeating steps S1 to S5 to perform subsequent lifting of the inner tank wall panel.

3. The lifting method of the inner tank wall panel of the LNG storage tank according to claim 2, wherein In step S4, when the inner tank wall panel reaches the predetermined position, the inner tank wall panel is fixed by a wall panel support device; when multiple inner tank wall panels are assembled in place in sequence, the wall panel support device ensures the stability of the inner tank wall panel that has been hoisted, and provides an assembly reference for subsequent inner tank wall panels.

4. The method for hoisting the inner tank wall plates of the LNG storage tank according to claim 3, wherein, The wall panel support device includes a support frame, a baffle, and a temporary welding fixture; one end of the support frame is connected to the inner tank wall panel, and the other end of the support frame is supported on the bottom plate. The baffle is arranged at the bottom of the inner tank wall panel, and the temporary welding fixture is installed at the joint of adjacent inner tank wall panels.

5. The method for hoisting the inner tank wall panel of the LNG storage tank according to claim 1, characterized in that, The electric hoist system uses a 5T electric hoist, and the truck crane system uses a 25T crane.

6. The lifting method of the inner tank wall panel of the LNG storage tank according to claim 1, characterized in that, During the hoisting process, pulling ropes are set at both ends of the inner tank wall panel being hoisted for pulling.

7. The lifting method of the inner tank wall panel of the LNG storage tank according to claim 1, characterized in that The electric hoist system is equipped with a lifting and lowering control device for accurately controlling the lifting and lowering of the lifting process.

8. The lifting method of the inner tank wall panel of the LNG storage tank according to claim 7, characterized in that, The electric hoist system adopts multi-point synchronous lifting, and multiple lifting points are set on the inner tank wall panel to be lifted for lifting. Each lifting point is controlled by the lifting and lowering control device to accurately adjust the lifting horizontal position, height and angle to dock the inner tank wall panel.

9. The method for hoisting the inner tank wall plate of an LNG storage tank according to claim 1, wherein During the lifting process, a total station and / or a distance meter are used to measure and correct the horizontal position, height and angle of the inner tank wall in real time.

10. The lifting method of the inner tank wall panel of the LNG storage tank according to claim 1, wherein The electric hoist system includes a plurality of sets of suspension point rails and an electric hoist, wherein the suspension point rails provide a moving path for the electric hoist.

11. A hoisting system for the inner tank wall plate of an LNG storage tank, characterized in that, The LNG storage tank inner tank wall panel lifting system is used to implement the LNG storage tank inner tank wall panel lifting method as described in any one of claims 1-10, and the LNG storage tank inner tank wall panel lifting system includes: an electric hoist system, a truck crane system, a hoist, and a wall panel support device.

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