A method and apparatus for floating crane hoisting of liquid tanks

Abstract

This application provides a method and apparatus for floating and hoisting a liquid tank. The method includes: S1, installing multiple crane arms on the liquid tank, symmetrically arranging the crane arms on the upper surfaces of inclined plates on both sides of the liquid tank; each crane arm includes a main plate with a preset length, oriented towards the center line of the liquid tank, and fixing both ends of the main plate to the connection points between the frame structure and the inclined plates; the main plate has a preset height and is provided with hoisting holes along its height direction. S2, transporting the liquid tank with the crane arms installed to the area to be floating and hoisted. S3, installing the floating crane equipment in the hoisting holes on the top of the liquid tank, hoisting the liquid tank into the hull, adjusting the liquid tank's attitude to ensure its levelness meets predetermined requirements, and then lowering the liquid tank. This application provides a novel method for hoisting liquid tanks, which, compared to the traditional mindset of only being able to build in a shipyard, allows for flexible selection of construction sites and improves shipbuilding efficiency.

Description

Technical Field

[0001] This application relates to the field of liquefied gas carrier technology, and more specifically, to a floating crane method and apparatus for lifting liquefied gas tanks. Background Technology

[0002] As vessels transporting liquefied gas (LNG), LNG carriers have LNG tanks installed within their hulls. Since these tanks are typically independent of the hull structure, lifting equipment is required to move them into the hull during the shipbuilding phase. Currently, large gantry cranes are commonly used in dry docks to lift the tanks into LNG carriers, especially for large and medium-sized vessels. However, due to the high cost of dry dock construction, building medium-sized LNG carriers in dry docks is less economically efficient than building large LNG carriers, failing to fully utilize the lifting capacity of large gantry cranes.

[0003] Against this backdrop, research has been conducted on floating cranes for Type C tanks of medium-sized liquefied gas carriers. However, with the development of new ship types, tanks previously used primarily in very large liquefied gas carriers are now being applied to medium-sized liquefied gas carriers, such as Type A and Type B tanks. However, due to limitations in existing production facilities, it is currently impossible to perform complete lifting and installation of Type A and Type B tanks for medium-sized liquefied gas carriers on the slipway, and there is no complete floating crane method for installing Type A or Type B tanks.

[0004] Therefore, there is an urgent need to invent a new method for hoisting liquid tanks to enable the floating installation of Type A and Type B liquid tanks on the slipway, while increasing the construction flexibility of Type A and Type B liquid tanks in new medium-sized liquefied gas carriers. Summary of the Invention

[0005] The purpose of this application is to provide a floating crane hoisting method and apparatus for liquid tanks, which breaks through the traditional thinking that conventional liquefied gas carrier A-type liquid tanks can only be built in the dock area covered by large gantry cranes. It allows for flexible selection of construction sites, optimizes shipyard resource allocation, and can significantly improve shipbuilding efficiency.

[0006] In a first aspect, a floating crane lifting method for a liquid tank is provided. The liquid tank includes a top plate and side wall plates. An inclined plate adapted to the top side compartments on both sides of a hull is provided between the top plate and the side wall plates. A skeleton structure for reinforcing the hull structure is arranged on the lower surface of the inclined plate. The skeleton structure includes transverse ribs, longitudinal frames, and longitudinal profiles. The method is characterized by including:

[0007] S1. Install multiple lifting arms on the liquid tank, symmetrically arranging the multiple lifting arms around the center of the liquid tank on the upper surface of the inclined plates on both sides; each lifting arm includes a main lifting arm board, each main lifting arm board has a preset length, so that each main lifting arm board faces the center line of the liquid tank, and the two ends of the main lifting arm board are respectively fixed at the connection position between the frame structure and the inclined plate; the main lifting arm board has a preset height, and lifting holes are arranged on its surface along its height direction;

[0008] S2. Transport the liquid tank equipped with the multiple cranes to the area to be floated;

[0009] S3. Install one end of the floating crane into the lifting hole on the top of the liquid tank, lift the liquid tank into the hull, adjust the attitude of the liquid tank so that the level of the liquid tank meets the predetermined requirements, and then lower the liquid tank to complete the floating crane lifting of the liquid tank.

[0010] In one embodiment, in S1, arranging the plurality of augers symmetrically about the center of the liquid tank on the upper surfaces of the inclined plates on both sides includes:

[0011] The plurality of lifting horses consists of at least four groups of lifting horses, each group including at least one lifting horse. The inclined plate is divided into four regions by the cross section and the longitudinal section in the liquid tank, and the four groups of lifting horses are arranged in the middle of the four regions.

[0012] In one embodiment, in S1, each of the hanging horses further includes two hanging horse panels, which are respectively fixed to both ends of the hanging horse main board, such that the middle position of one side of each hanging horse panel is arranged to fit against the end face of the hanging horse main board, and the arrangement direction of each hanging horse panel along the inclined plate is consistent with the extension direction of the skeleton structure on the lower surface of the inclined plate at the end face.

[0013] In one embodiment, aligning the arrangement direction of each of the hanging horse panels along the inclined plate with the extension direction of the skeleton structure on the lower surface of the inclined plate at the end face includes:

[0014] The extension direction of the hanging horse panel at one end of the hanging horse main board is aligned with that of the transverse rib; the extension direction of the hanging horse panel at the other end of the hanging horse main board is aligned with that of the longitudinal frame.

[0015] In one embodiment, in step S1, each of the hoisting horses further includes two hoisting horse webs, which are symmetrically attached to both sides of the main hoisting horse board, and the overlap height between each hoisting horse web and the main hoisting horse board is greater than or equal to a preset height; each hoisting horse web is provided with an opening, and when the hoisting horse web is attached to the main hoisting horse board, the opening is aligned with the hoisting hole.

[0016] In one embodiment, each of the gantry cranes includes a gantry crane reinforcement structure. In S1, during the segmented construction phase of the liquid tank, the gantry crane reinforcement structure is adapted to the position of the gantry crane main board and arranged on the lower surface of the inclined plate, and is fixed to the skeleton structure of the liquid tank as a whole.

[0017] In one embodiment, the reinforcing structure of the hoist includes a reinforcing main board. In step S1, the reinforcing main board is arranged on the lower surface of the inclined plate, which is in the same position and direction as the hoist main board. The reinforcing main board has a preset length and height, such that both ends of the reinforcing main board along its length are fixedly connected to the frame structure, and the height of the reinforcing main board is consistent with the height of the longitudinal frame. When the reinforcing main board penetrates the frame structure, the frame structure at the penetration point is cut off, so that the reinforcing main board passes through the cut-off point and connects to the frame structure.

[0018] In one embodiment, the step of fixing the two ends of the reinforcing motherboard along its length direction to the skeleton structure includes:

[0019] One end of the reinforced main board is connected to the transverse rib, and the other end is connected to the longitudinal profile; an arc structure transition is provided at the end connected to the transverse rib, and the arc structure is set to extend and transition along the longitudinal skeleton to the transverse rib; a beveled structure transition is provided at the end connected to the longitudinal profile, and the beveled structure extends and transitions along the longitudinal skeleton to the longitudinal profile.

[0020] In one embodiment, in S1, the hoist reinforcement structure further includes a reinforcement panel, which is attached to the lower end of the reinforcement main board. The length and surface shape of the reinforcement panel are adapted to the lower end of the reinforcement main board extending along the inclined plate.

[0021] Secondly, this application also provides a liquid tank floating hoisting device, including multiple cranes, which hoist the liquid tank according to the liquid tank floating hoisting method described in any embodiment of the first aspect.

[0022] The beneficial effects of the floating crane lifting method and apparatus for liquid tanks in this application are as follows:

[0023] 1. The floating crane lifting method and its special crane horse and crane horse reinforcement proposed in this application adopt a brand-new A-type liquid tank lifting method, which systematically and comprehensively provides technical support for the flexible construction of A-type liquid tank liquefied gas carriers. It breaks through the traditional thinking mode that A-type liquid tanks of conventional liquefied gas carriers can only be built in the dock area covered by large gantry cranes. It allows for flexible selection of construction sites, optimizes the allocation of shipyard resources, and can significantly improve shipbuilding efficiency.

[0024] 2. The special hoist and hoist reinforcement proposed in this invention are effective and relatively simple in form, and have similar structures, which enables mass production and can improve construction efficiency.

[0025] 3. The special lifting horse in this invention is simple in form and can be reused if dismantled; the lifting horse is reinforced and fixed to the internal structure of the liquid tank as one piece, avoiding subsequent dismantling work and increasing the reliability of the reinforced structure. Attached Figure Description

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a layout diagram of multiple hanging horses according to an embodiment of this application;

[0028] Figure 2 This is a schematic diagram illustrating the connection between a gantry crane and a liquid tank according to an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of a hanging horse according to an embodiment of this application;

[0030] Figure 4 According to Figure 3 A view of a hanging horse from direction A is shown;

[0031] Figure 5 According to Figure 3 A view of a hanging horse from direction B is shown;

[0032] Figure 6 This is a schematic diagram illustrating the connection relationship between a gantry reinforcement structure and a liquid tank according to an embodiment of this application;

[0033] Figure 7 This is a schematic diagram of a liquid tank equipped with a lifting arm, according to an embodiment of this application;

[0034] Figure 8 This is a schematic diagram of a liquid tank floating crane according to an embodiment of this application;

[0035] Figure 9 This is a schematic diagram illustrating a liquid tank hoisting and positioning structure according to an embodiment of this application.

[0036] 100. Liquid tank; 110. Top plate; 120. Inclined plate; 121. Transverse rib; 122. Longitudinal frame; 1221. Cut-off hole; 123. Longitudinal profile; 130. Side wall plate; 200. Crane; 210. Crane main plate; 211. Lifting hole; 220. Crane web; 230. Crane panel; 240. Reinforced main plate; 241. Arc structure; 242. Beveled structure; 250. Reinforced panel; 300. Floating crane equipment; 310. Primary wire rope; 320. Secondary wire rope; 330. Shackle; 400. Hull; 410. Spacing steel pipe; 420. Hydraulic cylinder; 430. End saddle; 440. Inner bottom saddle; 500. Slipway. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] In a first aspect, this application provides a floating crane lifting method for a liquid tank. The liquid tank 100 includes a top plate 110 and side wall plates 130. An inclined plate 120 adapted to the top side compartments on both sides of the hull is provided between the top plate 110 and the side wall plates 130. A skeleton structure for strengthening the hull structure is arranged on the lower surface of the inclined plate 120. The skeleton structure includes transverse ribs 121, longitudinal frames 122, and longitudinal profiles 123. The lifting method includes the following steps:

[0040] S1. Install multiple cranes 200 on the liquid tank 100, see [reference]. Figure 1 and Figure 7 Multiple lifting supports 200 are symmetrically arranged on the upper surfaces of the inclined plates 120 on both sides, with the liquid tank 100 at its center. Each lifting support 200 includes a main support 210, each main support 210 having a preset length. Along its length, each main support 210 is oriented towards the center line of the liquid tank 100, and both ends of the main support 210 are fixed to the connection points between the frame structure and the inclined plates 120. The main support 210 has a preset height, and lifting holes 211 are provided on its surface along its height direction.

[0041] S2. Transport the liquid tank 100, which is equipped with multiple cranes 200, to the area where it is to be floated;

[0042] S3. Install one end of the floating crane 300 into the lifting hole 211 on the top of the liquid tank 100. (See below) Figure 8 The liquid tank 100 is lifted into the hull 400, and the attitude of the liquid tank 100 is adjusted so that the level of the liquid tank 100 meets the predetermined requirements before the liquid tank 100 is lowered to complete the floating crane hoisting of the liquid tank 100.

[0043] In the above implementation process, the arrangement of the cranes is based on the characteristics of the floating crane hook. The floating crane hook is a single point, and the wire rope is inclined (while conventional gantry cranes have multiple hooks, and the spacing of the hooks is sufficient to cover the main dimensions of the liquid tank, and the wire rope is basically in a vertical lifting state, so there is no need to design such a special crane). Arranging the cranes on the inclined plate, the point of force during lifting is basically in the middle of the liquid tank, which is more conducive to the balanced force on the internal structure of the liquid tank and the control of lifting accuracy. This application, by installing multiple cranes at predetermined positions on the inclined plate of the liquid tank, with the installation direction of the cranes facing the center line of gravity of the liquid tank, and the two ends of the cranes arranged on the frame structure of the inclined plate, enables the floating crane installation of Type A liquid tanks in medium-sized liquefied vehicles on the slipway. At the same time, the cranes proposed in this invention are effective and relatively simple in form, and have similarity, making them suitable for mass production and improving construction efficiency. This floating crane hoisting method for liquefied gas carriers breaks through the traditional mindset that Type A liquefied gas tanks can only be built in the dock area covered by large gantry cranes. It allows for flexible selection of construction sites (such as slipway 500), optimizes shipyard resource allocation, and can significantly improve shipbuilding efficiency.

[0044] In one embodiment, in S1 above, arranging a plurality of gantry cranes 200 symmetrically about the center of the liquid tank 100 on the upper surface of the two inclined plates 120 includes:

[0045] The lifting rig 200 comprises at least four groups of lifting rigs 200, with each group consisting of at least one lifting rig 200. The inclined plate 120 is divided into four regions by the cross-section and longitudinal section of the liquid tank 100, and the four groups of lifting rigs 200 are arranged in the middle of these four regions. When designing the lifting rig positions, the optimal lifting point is chosen to be in a suitable central location, which is beneficial for lifting. If placed at either end of the inclined plate, the angle of the wire rope will be too large during lifting, increasing the stress. Furthermore, if the spacing between the lifting rigs 200 is too small or too large, it can easily cause structural deformation during the lifting of the liquid tank.

[0046] In one implementation, to ensure the stability of the main board 210 of the hoisting horse under stress and to guarantee hoisting safety, in S1 above, each hoisting horse 200 further includes two hoisting horse panels 230, which have an anti-tipping function. See also Figure 2 and Figure 3By fixing two lifting arm panels 230 to both ends of the lifting arm main plate 210, the middle position of one side of each lifting arm panel 230 is aligned with the end face of the lifting arm main plate 210, and the arrangement direction of each lifting arm panel 230 along the inclined plate 120 is consistent with the extension direction of the skeleton structure on the lower surface of the inclined plate 120 at the aforementioned end face. This arrangement ensures the alignment of the lifting arm panels 230 with the ribs or profiles of the liquid tank 100 body, guaranteeing the effectiveness of lifting force transmission. The length, width, and thickness of the lifting arm panels 230 are set according to the size of the liquid tank 100 and the dimensions of the inclined plate 120. Based on the floating lifting dimensions of most Type A liquid tanks, the thickness of the lifting arm panels 230 is generally set to 12mm, the length to 300mm, and the width to 150mm. The fillet weld K between the lifting arm panels 230 and the lifting arm main plate 210 is generally 7mm to 10mm.

[0047] In one embodiment, aligning the arrangement direction of each hanging bracket panel 230 along the inclined plate 120 with the extending direction of the skeleton structure on the lower surface of the inclined plate 120 at the aforementioned end face includes:

[0048] In designing the length of the main support plate 210, this invention incorporates the liquid tank frame structure, ensuring that the main support plate 210 and the inclined plate 120 are fixedly connected to the frame structure. Based on the dimensions of the main support plate 210, see [reference needed]. Figure 2 and Figure 3 Specifically, one end of the main support plate 210 is fixed to the transverse rib plate 121, and the other end is fixed to the longitudinal frame 122. Correspondingly, the lifting panel 230 at one end of the main support plate 210 is aligned with the extension direction of the transverse rib plate 121, and the lifting panel 230 at the other end of the main support plate 210 is aligned with the extension direction of the longitudinal frame 122. By aligning the lifting panel 230 with the rib plate or profile of the liquid tank 100 body, the effectiveness of lifting force transmission is ensured.

[0049] In one embodiment, in S1 above, to increase the lifting load of the crane arm, the lifting stability of the lifting hole 211 of the crane arm main plate 210 is increased. Each crane arm 200 also includes two crane arm webs 220, see [link to relevant documentation]. Figure 3Two lifting arm web plates 220 are symmetrically attached to both sides of the lifting arm main plate 210, ensuring that the overlap height between each lifting arm web plate 220 and the lifting arm main plate 210 is greater than or equal to a preset height. Each lifting arm web plate 220 has an opening, which is aligned with the lifting hole 211 when the lifting arm web plate 220 is attached to the lifting arm main plate. The thickness and width of the lifting arm web plate 220 need to be calculated based on the thickness and width of the lifting arm main plate 210 and the shear stress calculation formula to meet the safety load requirements. The length of the lifting arm web plate 220 is designed based on the size of the lifting arm main plate 210 and the position of the lifting hole, and the overlap width between the lifting arm web plate 220 and the lifting arm main plate 210 is generally not less than 50mm. The corner weld leg K between the lifting arm web plate 220 and the lifting arm main plate 210 is generally 7mm to 10mm, which can be adjusted according to the size of the liquid tank.

[0050] In one implementation, to improve the strength of the lifting rod 200, each lifting rod 200 includes a lifting rod reinforcement structure. In the above S1, during the segmented construction stage of the liquid tank, considering the structural characteristics of the liquid tank, see [reference needed]. Figure 6 The reinforcing structure of the gantry crane is adapted to the position of the main gantry crane 210 and positioned on the lower surface of the inclined plate 120. In one case, when the angle between the main gantry crane 210 and the longitudinal section of the hull is 55°, the angle α of the reinforcing structure is 55°, and it is fixed to the skeleton structure of the liquid tank 100 as a whole. The gantry crane reinforcement is effective and relatively simple in form, and the structures are similar, enabling mass production and improving construction efficiency. The gantry crane reinforcement structure is positioned and installed as part of the liquid tank structure during the segmented construction stage of the liquid tank 100, and is permanently retained with the internal structure of the liquid tank 100 without being removed.

[0051] In one embodiment, the gantry reinforcement structure includes a reinforcing mainboard 240, as described in S1 above. Figure 3 The reinforcing main board 240 is positioned on the lower surface of the inclined plate 120, which shares the same position and orientation as the main board 210 of the hanging frame. The reinforcing main board 240 has a preset length and height, with both ends along its length fixedly connected to the frame structure. The height of the reinforcing main board is consistent with the height of the longitudinal frame 122. (See also...) Figure 7When reinforcing the main board 240 penetrates the skeleton structure, a break hole 1221 is made in the skeleton structure at the penetration point, allowing the reinforcing main board 240 to pass through the break hole 1221 and connect with the skeleton structure using an angle connection. The position and direction of the reinforcing main board 240 are consistent with the main board 210 of the hoist, and it extends to the adjacent skeleton structure to ensure good force transmission during tank hoisting. The thickness of the reinforcing main board 240 is generally the thickness of the adjacent skeleton structure. The width of the reinforcing main board 240 is generally 1 / 2 the height of the adjacent transverse rib 121, and is consistent with the height of the longitudinal skeleton 122 of the tank inverted top. The length of the reinforcing main board is generally the spacing between the two skeleton structures of the tank inverted top structure. The angle joint between the reinforcing main board 240 and the inclined plate 120 of the tank 100, i.e., the upper opening of the reinforcing main board 240, uses a deep penetration weld bevel, leaving 1 / 3 of the thickness of the reinforcing main board 240.

[0052] In one embodiment, fixing the two ends of the reinforcing motherboard 240 along its length to the frame structure includes:

[0053] One end of the reinforced mainboard 240 is connected to the transverse rib 121, and the other end is connected to the longitudinal profile 123. Considering the presence of reinforcing ribs on the reverse side to avoid stress concentration, an arc structure 241 is provided at the end connecting to the transverse rib for transition. This arc structure 241 extends along the direction from the longitudinal frame 122 to the transverse rib 121, improving overall force transmission. A beveled structure 242 is provided at the end connecting to the longitudinal profile 123. Generally, beveling simplifies the force transition when connecting large and small frames, and the beveled structure 242 extends along the direction from the longitudinal frame 122 to the longitudinal profile 123.

[0054] In one embodiment, in S1 above, the hoist reinforcement structure further includes a reinforcement panel 250, which is attached to the lower end of the main reinforcement plate 240. The length and surface shape of the reinforcement panel 250 are adapted to the lower end of the main reinforcement plate 240 extending along the inclined plate. The reinforcement panel 250 and the main reinforcement plate 240 are connected by a corner joint to enhance the overall strength of the hoist 200's upward reinforcement. The thickness of the reinforcement panel 250 is generally 16mm to 18mm, the width is generally 150mm, and the length generally follows the lower edge of the main reinforcement plate. The corner joint weld K between the main reinforcement plate 240 and the reinforcement panel 250 is generally 7mm to 10mm.

[0055] In the above implementation process, in S3, one end of the floating crane 300 is installed in the lifting hole 211 on the top of the liquid tank 100 via a steel wire rope, see [link / reference]. Figure 8The wire rope is divided into two parts: the upper part is the primary wire rope 310, and the lower part is the secondary wire rope 320. The primary wire rope 310 and the secondary wire rope 320 are connected by a shackle 330. The number of wire ropes in the secondary wire rope 320 can be adjusted according to the number of hoists in each set of hoists 200. The specific operation for lifting the liquid tank 100 into the hull 400 and adjusting the attitude of the liquid tank 100 to make its levelness meet the predetermined requirements is as follows: See Figure 9 At the bottom of the liquid tank in the hull, adjusting devices such as spaced steel pipes 410 and hydraulic cylinders 420 are pre-arranged at positions corresponding to the bottom mounting structures of the liquid tank (e.g., end saddle 430 and inner bottom saddle 440). The spaced steel pipes 410 and hydraulic cylinders 420 are arranged symmetrically with a cross interval, and the liquid tank is placed on the spaced steel pipes 410 pre-arranged in the main hull to achieve rapid hook release. The liquid tank is adjusted according to the positioning requirements by adjusting the position of the liquid tank in the X, Y, and Z directions using hydraulic cylinders 420 to ensure that the positioning of the liquid tank meets the accuracy requirements, and then epoxy casting is performed.

[0056] Secondly, this application also provides a liquid tank floating hoisting device, including a plurality of hoisting horses 200, which hoist the liquid tank 100 according to the liquid tank floating hoisting method in any of the embodiments of the first aspect above.

[0057] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for floating crane hoisting of a liquid tank, the liquid tank comprising a top plate and side wall plates, wherein an inclined plate adapted to the top side compartments on both sides of a hull is provided between the top plate and the side wall plates, and a skeleton structure for reinforcing the hull structure is arranged on the lower surface of the inclined plate, the skeleton structure comprising transverse ribs, longitudinal frames, and longitudinal profiles, characterized in that... include: S1. Install multiple removable lifting arms on the liquid tank, symmetrically arranging the multiple removable lifting arms around the center of the liquid tank on the upper surfaces of the inclined plates on both sides; each lifting arm includes a main lifting arm plate, each main lifting arm plate has a preset length, such that each main lifting arm plate faces the center line of gravity of the liquid tank, and the two ends of the main lifting arm plate are respectively fixed at the connection position between the frame structure and the inclined plate; the main lifting arm plate has a preset height, and lifting holes are arranged on its surface along its height direction; each lifting arm includes a lifting arm reinforcement structure, in the In S1, during the segmented construction phase of the liquid tank, the reinforcing structure of the hoist is adapted to the position of the main board of the hoist and arranged on the lower surface of the inclined plate, and fixed to the skeleton structure of the liquid tank as a whole; each hoist also includes two hoist panels, which are respectively fixed to both ends of the main board of the hoist, so that the middle position of one side of each hoist panel is attached to the end face of the main board of the hoist, and the arrangement direction of each hoist panel along the inclined plate is consistent with the extension direction of the skeleton structure on the lower surface of the inclined plate at the end face; The step of aligning each of the hanging horse panels along the arrangement direction of the inclined plate with the extension direction of the skeleton structure on the lower surface of the inclined plate at the end face includes: aligning the hanging horse panel at one end of the hanging horse main board with the extension direction of the transverse rib; aligning the hanging horse panel at the other end of the hanging horse main board with the extension direction of the longitudinal skeleton; the hanging horse reinforcement structure includes a reinforcement main board, and in step S1, the reinforcement main board is arranged on the lower surface of the inclined plate with the same position and direction as the hanging horse main board; the reinforcement main board has a preset length and height, and both ends of the reinforcement main board along its length direction are fixedly connected to the skeleton structure, the height of the reinforcement main board being equal to the... The height of the longitudinal skeleton remains consistent; when the reinforcing main board penetrates the skeleton structure, the skeleton structure at the penetration point is cut off, so that the reinforcing main board penetrates through the cut-off point and connects to the skeleton structure; the step of fixing the two ends of the reinforcing main board to the skeleton structure along its length direction includes: one end of the reinforcing main board is connected to the transverse rib, and the other end is connected to the longitudinal profile; an arc structure transition is provided at the end connected to the transverse rib, and the arc structure is set to extend and transition along the direction from the longitudinal skeleton to the transverse rib; a beveled structure transition is provided at the end connected to the longitudinal profile, and the beveled structure extends and transitions along the direction from the longitudinal skeleton to the longitudinal profile; S2. Transport the liquid tank equipped with the multiple cranes to the area to be floated; S3. Install one end of the floating crane into the lifting hole on the top of the liquid tank, lift the liquid tank into the hull, adjust the attitude of the liquid tank so that the level of the liquid tank meets the predetermined requirements, and then lower the liquid tank to complete the floating crane lifting of the liquid tank.

2. The floating crane lifting method for liquid tanks according to claim 1, characterized in that, In S1, arranging the plurality of augers symmetrically about the center of the liquid tank on the upper surfaces of the inclined plates on both sides includes: The plurality of lifting horses consists of at least four groups of lifting horses, each group including at least one lifting horse. The inclined plate is divided into four regions by the cross section and the longitudinal section in the liquid tank, and the four groups of lifting horses are arranged in the middle of the four regions.

3. The floating crane lifting method for liquid tanks according to claim 1, characterized in that, In S1, each of the hoisting horses further includes two hoisting horse webs, which are symmetrically attached to both sides of the main hoisting horse board, and the overlap height between each hoisting horse web and the main hoisting horse board is greater than or equal to a preset height; each hoisting horse web is provided with an opening, and when the hoisting horse web is attached to the main hoisting horse board, the opening is aligned with the hoisting hole.

4. The floating crane lifting method for liquid tanks according to claim 1, characterized in that, In S1, the hoist reinforcement structure also includes a reinforcement panel, which is attached to the lower end of the reinforcement main board. The length and surface shape of the reinforcement panel are adapted to the lower end of the reinforcement main board extending along the inclined plate.

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