Method for assembling large modules by lifting them on water

Abstract

The present application relates to a kind of large module water hoisting and closing method, including hoisting point position selection step, positioning device preparation step and on-site hoisting and closing step.In the on-site hoisting and closing step, first module is transported to dock by barge, and is positioned at a height position using hoisting equipment in dock.The lower hull is transported into the dock and positioned directly below the module, at which time the lower hull abuts the first positioning portion.The module is completed on the lower hull, and the module is hoisted and closed.Through the design of the lower hoisting point, the overall stress of the module can be effectively ensured to be uniform, and the stability of the module hoisting is improved.Through the positioning device, the position of the lower hull in the dock can be effectively positioned, the positioning of the lower hull in the floating state is facilitated, and the modules can be accurately aligned during the closing installation.The method is suitable for the closing installation of super-large modules on the ship in the dock, and can enable the modules with similar structures and excessive weights to be safely hoisted and closed in the dock by relying on the Taiyuan crane.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for assembling and assembling large modules on water. Background Technology

[0002] The oversized modules are generally truss structures, with their main materials consisting of interwoven steel pipes, I-beams, and other profiles. Depending on the module's function, the structural profiles vary in thickness and have irregular shapes, accommodating random placement of the main structural elements for the lifting lugs. Numerous pieces of equipment are housed within the modules, and multiple modules are located at different positions on the lower deck, requiring a single Taishan crane to handle the lifting load.

[0003] Because the lifting method of Taishan cranes is mainly based on the lifting platform method, there are no suitable welding platform positions for the truss-type module structure. Furthermore, the traditional four-point lifting method cannot find suitable positions on the main structure of the module, and the plate-type lifting lugs used in the traditional four-point method require a very large external structure that cannot be welded to the main structure. Therefore, there is an urgent need to invent a new method for assembling large truss-type marine modules. Summary of the Invention

[0004] One objective of this invention is to overcome the shortcomings of existing technologies and provide a method for the assembly and installation of large modules on water. To solve the above-mentioned technical problems, this invention adopts the following technical solution: A method for assembling and assembling large modules on water, used to assemble large modules to a predetermined position on the deck surface of the lower hull, includes: Steps for selecting the location of the suspension points: Based on the location of the main vertical beam of the module, select 3 or 4 suspension points on the two opposite outer surfaces of each module along the vertical direction. The projections of each suspension point on the two outer surfaces onto the horizontal plane are planar symmetrical. Preparation steps of the positioning device: The positioning device includes a first positioning part and a second positioning part. The first positioning part and the second positioning part are respectively arranged on both sides of the dock along a first direction, which is the width direction of the lower hull. The positioning device is used to limit the position of the lower hull in the dock. On-site hoisting and assembly steps: The module is transported to the dock by barge, and the module is lifted and positioned at a certain height using hoisting equipment in the dock; the lower hull is transported into the dock and positioned directly below the module, at which point the lower hull abuts against the first positioning part; the module is lowered onto the lower hull to complete the module assembly.

[0005] In one embodiment, the step of selecting the lifting point location further includes the step of welding lifting lugs at each lower lifting point.

[0006] In one embodiment, the lug is a cylindrical structure that protrudes from the outer surface along the extension direction of the main beam of the module.

[0007] In one embodiment, a baffle is provided at the end of the lug furthest from the module, and the area of ​​the baffle is larger than the cross-sectional area of ​​the lug.

[0008] In one embodiment, during the on-site hoisting and assembly step, the hook of the hoisting equipment can connect two adjacent lowering points on the same outer surface of the module via a wire rope.

[0009] In one embodiment, during the on-site hoisting and assembly step, when the hoisting equipment simultaneously lifts two modules arranged along the first direction, after the step of lowering the modules onto the lower hull, the method further includes: Move the lower hull along the first direction until it abuts against the second positioning part, and then lower another module onto the lower hull to complete the closure of that other module.

[0010] In one embodiment, the straight-line distance between the first positioning part and the second positioning part along the first direction is the sum of the width of the lower hull and a preset distance W, where the preset distance W is equal to the interval distance between two adjacent modules arranged along the first direction.

[0011] In one embodiment, after completing the closing step of the two modules arranged along the first direction, the method further includes: The lower hull was moved out of the dry dock. The remaining modules were assembled one by one according to the on-site hoisting and assembly steps; the positioning position of the lower hull along the second direction was determined by the number of turns of the cable on each bollard recorded during the initial hoisting and assembly movement of the lower hull, and the second direction is the length direction of the lower hull.

[0012] In one embodiment, along the second direction, the position where the lower hull first closes is defined as the first position, and the position where the lower hull second closes is defined as the second position. The distance L between the first position and the second position is equal to the center-to-center distance between two adjacent modules arranged along the second direction.

[0013] In one embodiment, the positioning device further includes a third positioning part disposed in the dock, which is capable of abutting against the stern of the lower hull in the first position.

[0014] In one embodiment, during the process of the module descending and closing, the ballast water of the lower hull is adjusted in real time according to the buoyancy of the lower hull in the water, so that the lower hull always remains horizontal.

[0015] In one embodiment, the specific steps for adjusting the ballast water in the lower hull include: The draft difference between the ballast tanks on the lower hull is obtained by using the draft marks set on the lower hull. Ballast water is discharged from the ballast tanks with high draft levels to adjust the hull's buoyancy and keep it level at all times.

[0016] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects: The large module waterborne hoisting and assembly method provided by this invention is applicable to the assembly and installation of ultra-large modules on ships in a dock. It enables modules with similar structures and extremely large weights to be assembled and hoisted safely in a dock using Taishan cranes, in addition to the limited resources of floating crane operations.

[0017] Specifically, the design of the lower lifting points effectively ensures uniform stress distribution across the module, improving the stability of module hoisting. Furthermore, the positioning device effectively locates the lower hull within the dock, particularly reliably positioning it along its width within the dock, facilitating the positioning of the floating lower hull and ensuring accurate alignment during module assembly. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the method for assembling and assembling large modules on water in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the module hoisting structure in the method of this embodiment of the invention.

[0020] Figure 3 yes Figure 2 The diagram shows the structure as viewed along the direction of arrow A.

[0021] Figure 4 yes Figure 3 The diagram shows the structure as viewed along the direction of arrow B.

[0022] Figure 5 This is a schematic diagram of the lifting lugs on the module in the method of this embodiment of the invention.

[0023] Figure 6 This is a schematic diagram of the lower hull in the dock during the method of this embodiment of the invention.

[0024] Figure 7 yes Figure 6 The diagram shows the structure viewed along the CC direction and in the state of step S31.

[0025] Figure 8 yes Figure 6 The diagram shows the structure viewed along the CC direction and in the state of step S33.

[0026] Figure 9 This is a schematic diagram of the positioning device in the method of this embodiment of the invention.

[0027] The annotations in the attached figures are explained as follows: 10-Lower hull; 20-Module; 210 - Vertical beam; 220 - Horizontal beam; 201 - Lower lifting point; 211 - Lifting lug; 212 - Baffle; 30 - Lifting equipment; 301 - Steel wire rope; 40 - Positioning device; 401 - First positioning unit; 402 - Second positioning unit; 403 - Third positioning unit; 41-Positioning bracket; 42-Fixing bracket; 50-Barge. Detailed Implementation

[0028] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0029] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] The large-module floating hoisting and assembly method of this invention is mainly applicable to the hoisting and assembly of multiple ultra-large truss-type modules 20 on floating production storage and offloading (FPSO) vessels. The ultra-large modules 20 are generally truss-type structures, with their main materials consisting of steel pipes, I-beams, and other profiles arranged in an interlaced pattern. Based on the functional classification of the modules 20, the main profiles of each module 20 vary in thickness and have irregular structures, allowing for random placement of the lifting lugs. Each module 20 houses numerous pieces of equipment, with a total weight reaching approximately 6000 tons, and multiple modules 20 are located at different positions on the lower hull 10 deck.

[0032] Please see Figure 1As shown, the large module waterborne hoisting and assembly method of this embodiment of the invention is used to assemble the large module 20 to a predetermined position on the deck surface of the lower hull 10. The method includes: S10, Steps for selecting the lifting point location; S20, the preparation steps for positioning device 40; and S30, on-site hoisting and assembly steps.

[0033] Specifically, such as Figure 2 and Figure 3 As shown, in step S10 of selecting the lifting point positions, based on the position of the main vertical beam 210 of module 20, three or four lower lifting points 201 are selected on the two opposite outer surfaces of each module 20 along the vertical direction. It can be understood that a total of six or eight lower lifting points 201 are selected on each module 20.

[0034] It is worth noting that in this embodiment, each hanging point 201 does not refer to a single point, but rather to a combination of points on the outer surface of module 20 located on the same vertical line (e.g., the same vertical beam 210). Figure 3 As shown, Figure 3 The diagram illustrates the positions of four hanging points 201 selected on one side surface of module 20.

[0035] Among them, the projections of each hanging point 201 on the two outer surfaces onto the horizontal plane are planar symmetrical. Figure 4 As shown, four hanging points 201 are selected on each of the two outer surfaces of module 20. Each hanging point 201 on the two outer surfaces of module 20 corresponds to the other two points and is planar symmetrical. That is to say, each hanging point 201 on the two outer surfaces corresponds to the other two points, and the line connecting the projections of the two corresponding hanging points 201 (or can be understood as two corresponding vertical lines) on the horizontal plane can be perpendicularly bisected by a vertical plane.

[0036] In other words, when a lower lifting point 201 is selected on one side of the outer surface of module 20, a corresponding lower lifting point 201 should also be set at the corresponding position on the other side of the outer surface of module 20. This ensures that the module 20 is subjected to uniform force and improves the stability of lifting the module 20.

[0037] In this embodiment of the application, after selecting the lifting point position in step S10, the step of welding lifting lugs 211 at each lifting point 201 is further included.

[0038] See Figure 5As shown, in one embodiment, the lifting lug 211 is a cylindrical structure protruding from the outer surface of the module 20 along the extension direction of the main crossbeam 220. Specifically, the lifting lug 211 can be directly made of a circular steel pipe structure, which is vertically welded to the selected position. This facilitates the direct mounting of the steel wire rope 301 onto the steel pipe, making lifting easier. In this embodiment, the lifting lug 211 is welded to the extension of the crossbeam 220 and located at the intersection of the crossbeam 220 and the vertical beam 210 of the module 20. This position has high structural strength and ample welding space. This allows the lifting lug 211 to meet the lifting strength requirements and improve the reliability of the lifting operation.

[0039] Furthermore, such as Figure 5 As shown, a baffle 212 is provided at the end of the lifting lug 211 away from the module 20, and the area of ​​the baffle 212 is larger than the cross-sectional area of ​​the lifting lug 211. It can be understood that when the aforementioned wire rope 301 is fitted onto the lifting lug 211, the inner diameter of the loop of the wire rope 301 is approximately the same as the cross-sectional diameter of the lifting lug 211. Therefore, in this embodiment, the area of ​​the baffle 212 is also larger than the cross-sectional area of ​​the aforementioned wire rope 301 loop, thereby effectively preventing the wire rope 301 from falling off the lifting lug 211 during hoisting, effectively improving the reliability of the hoisting.

[0040] See Figure 6 As shown, in the preparation step S20 of the positioning device 40, the positioning device 40 includes a first positioning part 401 and a second positioning part 402. The first positioning part 401 and the second positioning part 402 are respectively disposed on both sides of the dock along a first direction (labeled X), where the first direction is the width direction of the lower hull 10. The positioning device 40 is used to define the position of the lower hull 10 within the dock. By setting the positioning device 40, the position of the lower hull 10 within the dock can be effectively positioned. In particular, the positioning device 40 can reliably position the lower hull 10 within the dock along the first direction X. The positioning process of the positioning device 40 for the lower hull 10 will be specifically explained in conjunction with the subsequent hoisting and assembly process.

[0041] It should be noted that in this embodiment of the application, the lifting point location selection step S10 and the positioning device 40 preparation step S20 do not have a strict order, and the two steps can be performed simultaneously.

[0042] See Figure 1 As shown, the on-site hoisting and assembly step S30 specifically includes: S31, the module 20 is transported to the dock by barge 50, and the module 20 is lifted and positioned at a certain height by hoisting equipment 30 in the dock. A schematic diagram is shown below. Figure 7 As shown. Among them, hoisting equipment 30 is an existing large-tonnage platform crane, commonly known as the Taishan crane. Since the specific structure of the Taishan crane is existing technology, it will not be described in detail here.

[0043] Combination Figure 2 As shown, the two sets of lifting lugs 211 on the outer surfaces of both sides of module 20 are located directly below the two main beams of the Taishan crane.

[0044] In step S31, the hoisting connection between the hoisting equipment 30 and the module 20 can be achieved by the hook of the hoisting equipment 30 being able to connect two adjacent lower lifting points 201 on the same outer surface of the module 20 via a steel wire rope 301.

[0045] Specifically, such as Figure 3 As shown, when each outer surface of module 20 is provided with 4 lower lifting points 201, one hook of the hoisting equipment 30 connects two of the adjacent lower lifting points 201 with a steel wire rope 301, and the remaining two adjacent lower lifting points 201 are hoisted to another hook of the hoisting equipment 30 by another steel wire rope 301.

[0046] It is understandable that when each outer surface of module 20 is provided with 3 lower lifting points 201, one hook of the hoisting equipment 30 connects two of the adjacent lower lifting points 201 with a steel wire rope 301, and the remaining lower lifting point 201 is hoisted to another hook of the hoisting equipment 30 by a steel wire rope 301.

[0047] In this embodiment, when a wire rope 301 connects two adjacent lower lifting points 201 on the same outer surface of the module 20, the wire rope 301 can rotate back and forth at the hook of the lifting equipment 30. Both ends of the wire rope 301 are respectively fitted onto the cylindrical lifting lugs 211 of the two lower lifting points 201, and the wire rope 301 can also rotate freely along its own length on the lifting lugs 211. Therefore, this lifting method can change the statically indeterminate force distribution at multiple lifting points, balancing the entire lifting system and avoiding unpredictable deformation hazards to the module 20, crane, lifting beam, rigging, etc., thus meeting the lifting requirements.

[0048] It should be understood that after lifting module 20, barge 50 needs to be transported out of the dock. Then, the on-site lifting and assembly step S30 further includes step S32, where the lower hull 10 is transported into the dock and positioned directly below module 20, at which point the lower hull 10 abuts against the first positioning part 401. In step S33, the module 20 is lowered onto the lower hull 10, thus completing the closure of the module 20.

[0049] Combination Figure 6 and Figure 8 As shown, the lower hull 10 is moored to the side that abuts against the first positioning part 401, directly below module 1, by means of traction and control of the dockside cable. After the lower hull 10 is secured, module 1 descends and begins alignment and closing.

[0050] Please continue reading Figure 6 and Figure 8 In the on-site hoisting and assembly step S30, when the hoisting equipment 30 simultaneously lifts the two modules 20 arranged along the first direction X, after the step of lowering module 20 (module 20 at this time is module 1) onto the lower hull 10, step S34 is also included: The lower hull 10 is moved along the first direction X until it abuts against the second positioning part 402, and another module 20 (module 2) is dropped onto the lower hull 10 to complete the closing of the other module 20.

[0051] Specifically, such as Figure 6 As shown, if module 1 and module 2 are transported to the dock in one go using barge 50, and then simultaneously lifted using hoisting equipment 30, and module 1 is assembled and installed through the aforementioned steps S32 and S33, the bollards can move the lower hull 10 in the water by loosening or tightening the cables, so that it abuts against the second positioning part 402. After the lower hull 10 is fixed, module 2 is lowered and alignment and assembly begin. This allows for the continuous completion of the hoisting and assembly process of two modules 20, effectively improving work efficiency.

[0052] It should be noted that the first positioning part 401 and the second positioning part 402 along the first direction X are the sum of the width of the lower hull 10 and the preset distance W, and the preset distance W is equal to the interval distance between two adjacent modules 20 arranged along the first direction.

[0053] For example, see Figure 6 As shown, the two modules 20 (e.g., module 1 and module 2) arranged along the width direction of the lower hull 10 are typically spaced 1 meter apart. Since a distance of 1 meter is too small to be adjusted by calculating the number of turns of the cable, the lower hull 10 is positioned by a first positioning part 401 and a second positioning part 402 pre-set in the dock. This effectively positions the distance the lower hull 10 moves along the first direction, improving the alignment and closing accuracy of the two modules 20.

[0054] Further, see Figure 1 After completing the closing step of the two modules 20 arranged along the first direction, step S35 is also included: The lower hull 10 is moved out of the dock; the remaining modules 20 are assembled one by one according to the on-site hoisting and assembly steps S30.

[0055] Specifically, such as Figure 6As shown, after modules 1 and 2 are joined together, the remaining modules 3 and 4 need to be joined and installed. First, the lower hull 10 is moved out of the dock. Then, modules 3 and 4 are transported to the dock by barge 50, and lifted by hoisting equipment 30 within the dock. The lower hull 10 is then moved into the dock and positioned directly below module 3, at which point it abuts against the first positioning part 401. Module 3 is lowered onto the lower hull 10, completing the joining of module 3. Afterward, the lower hull 10 is moved along the first direction X until it abuts against the second positioning part 402, and module 4 is lowered onto the lower hull 10, completing the joining of module 4.

[0056] It should be noted that modules 3 and 4 are located at different positions relative to modules 1 and 2 along the length of the lower hull 10. Therefore, when modules 1 and 2 are joined together, and modules 3 and 4 are to be joined and installed, the position of the lower hull 10 within the dock needs to be repositioned along its length. Based on this, during the hoisting and joining of modules 3 and 4, the positioning position of the lower hull 10 along the second direction (denoted as Y) is determined by the number of turns of the cable on each bollard recorded during the initial hoisting and joining movement of the lower hull 10. Here, the second direction Y represents the length direction of the lower hull 10.

[0057] Specifically, along the second direction Y, the position where the lower hull 10 first assembles is defined as the first position, and the position where the lower hull 10 second assembles is defined as the second position. Then, the distance L between the first position and the second position is equal to the center-to-center distance between two adjacent modules 20 arranged along the second direction.

[0058] It can be understood that the first position is the position of the lower hull 10 in the dry dock when modules 1 and 2 are assembled and installed, and the second position is the position of the lower hull 10 in the dry dock when modules 3 and 4 are assembled and installed. For example... Figure 6 As shown, when the lower hull 10 is in the second position, modules 3 and 4 should coincide with the center positions of modules 1 and 2 previously. That is, the lower hull 10 needs to move a distance L in the direction of arrow D from the first position to reach the second position. This distance L is equal to the center-to-center distance between modules 1 and 3, or equal to the center-to-center distance between modules 2 and 4. Therefore, by combining the number of turns of the cable on each bollard recorded when modules 1 and 2 are installed with the distance L, the position for installing modules 3 and 4 on the lower hull 10 can be determined.

[0059] Preferably, the positioning device 40 further includes a third positioning part 403 disposed in the dock, which can abut against the stern of the lower hull 10 in the first position. The third positioning part 403 can accurately define the position of the lower hull 10 when it is first closed in the second direction, ensuring the precise alignment of the module 20.

[0060] In this embodiment, the first positioning part 401, the second positioning part 402, and the third positioning part 403 can have the same structure. See also Figure 9 As shown, the structure of each positioning part can be: including a positioning bracket 41 and a fixed bracket 42 connected together. The positioning bracket 41 is used to abut against the lower hull 10, and the fixed bracket 42 is used to be fixedly connected to the bottom surface of the dock. The positioning bracket 41 and the fixed bracket 42 can be made of profiles and connected by welding.

[0061] In this embodiment of the application, during the on-site hoisting and closure step S30, the ballast water of the lower hull 10 is adjusted in real time according to the buoyancy of the lower hull 10 in the water, so that the lower hull 10 always remains horizontal.

[0062] It is understood that the lower hull 10 is equipped with ballast tanks at various locations, and each ballast tank can be filled with water and drained to achieve load adjustment of the lower hull 10. Since the hoisting and closure method of this embodiment operates on the water surface in the dock, after the lower hull 10 is launched, water needs to be filled into each of its internal ballast tanks to keep the lower hull 10 level and floating on the water surface, and then it is towed into the dock by the barge 50, and finally positioned by bollards and cables.

[0063] Once the lower hull 10 is in place, as the module 20 begins to descend onto the deck mounting surface of the lower hull 10, the forces acting on the lower hull 10 increase continuously with each descent. Because the modules 20 descend and converge at different positions on the lower hull 10's deck, the uneven stress on the lower hull 10 during the descent of each module 20 causes it to tilt. Therefore, by draining water from different ballast tanks of the lower hull 10 as needed, the lower hull 10 is kept in a horizontal floating state. Drainage stops once the module 20 has completely landed on the lower hull 10 and the entire vessel remains horizontally floating.

[0064] In detail, the specific steps for adjusting the ballast water of the lower hull 10 include: The draft difference between each ballast tank on the lower hull 10 is obtained by using the draft marks set on the lower hull 10. Ballast water is discharged from the ballast tanks with high draft levels to adjust the buoyancy of the lower hull 10 so that it remains level at all times.

[0065] Specifically, the draft level of each ballast tank can be obtained through the water level gauge marks set on the outer circumference of the lower hull 10, and the draft difference between each ballast tank can be obtained based on the draft level of each ballast tank. For example, during the process of a module 20 falling into the lower hull 10, the draft level of the ballast tank at the corresponding position of the module 20 will rise, forming a large draft difference with the draft levels of other ballast tanks. At this time, by discharging ballast water out of the ballast tank at the corresponding position of the module 20, the overall center of gravity balance of the lower hull 10 can be adjusted, so that the lower hull 10 maintains a horizontal floating attitude.

[0066] It is understandable that during the descent and closure of each module 20, the ballast water of the lower hull 10 needs to be adjusted in real time according to the buoyancy of the lower hull 10 in the water to keep the lower hull 10 level at all times, thereby effectively ensuring the precise alignment and closure of each module 20 during the waterborne hoisting operation.

[0067] In other embodiments, ballast water can be added to the ballast tanks with low draft levels to adjust the buoyancy of the lower hull 10 so that it remains level at all times.

[0068] As can be seen from the above technical solution, the large module waterborne hoisting and assembly method of the present invention has at least the following beneficial effects: By selecting the location of the main structure (vertical beam 210) of the super-large module 20 as the lower lifting point 201, and using steel pipes of the same material to extend vertically to a sufficient length as cylindrical lifting lugs 211, interference between the super-large module 20 and other structures and equipment is avoided. Each module 20 is equipped with 6 or 8 lower lifting points 201, solving the problem of excessive stress on the traditional 4 lifting points. Furthermore, the design of the lower lifting point 201 positions effectively ensures the uniformity of stress on the module 20 as a whole, improving the stability of lifting the module 20.

[0069] In addition, the method of connecting two lower lifting points 201 with a single steel wire rope effectively changes the statically indeterminate force distribution at multiple lifting points, balances the entire lifting system, and avoids unpredictable deformation hazards to module 20, crane, lifting beam, rigging, etc., thus meeting the lifting requirements.

[0070] The method of this invention, through the design of the lower lifting point 201 and the lifting lug 211, as well as the design of the connection method of the lower lifting point 201, enables the lifting and assembly of the large module 20 to be achieved on water using a commonly used Taishan crane. This method is not limited by the special structure of the module 20, the increased number of lifting points on the module 20, or the scarcity and high cost of floating crane resources.

[0071] The method of the present invention, by setting a positioning device 40, can effectively locate the position of the lower hull 10 in the dock. In particular, it can reliably locate the position of the lower hull 10 in the dock along the width direction of the hull, which facilitates the positioning of the lower hull 10 in a floating state and enables accurate alignment when the modules 20 are assembled.

[0072] By adjusting the ballast water of the lower hull 10 in real time according to its buoyancy in the water, the lower hull 10 can always remain horizontal, which can effectively improve the alignment accuracy when the modules 20 are assembled.

[0073] The above embodiments are merely illustrative examples of structures. The structures in each embodiment are not fixed combinations. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used.

[0074] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for assembling and assembling large modules on water, used to assemble large modules to a predetermined position on the deck surface of the lower hull, characterized in that, include: Lifting point selection steps: Based on the position of the main vertical beam of the module, select 3 or 4 lower lifting points on the two opposite outer surfaces of each module along the vertical direction, wherein the projections of each lower lifting point on the two outer surfaces onto the horizontal plane are planar symmetrical. Preparation steps of the positioning device: The positioning device includes a first positioning part and a second positioning part. The first positioning part and the second positioning part are respectively disposed on both sides of the dock along a first direction, which is the width direction of the lower hull. The positioning device is used to define the position of the lower hull in the dock. On-site hoisting and assembly steps: The module is transported to the dock by barge, and the module is lifted and positioned at a certain height using hoisting equipment in the dock; the lower hull is transported into the dock and positioned directly below the module, at which point the lower hull abuts against the first positioning part; the module is lowered onto the lower hull to complete the assembly of the module. In the on-site hoisting and assembly step, when the hoisting equipment simultaneously lifts the two modules arranged along the first direction, after the step of lowering the modules onto the lower hull, the method further includes: Move the lower hull along the first direction until it abuts against the second positioning part, and then drop the other module onto the lower hull to complete the closure of the other module; After completing the closing step of the two modules arranged along the first direction, the method further includes: The lower hull is moved out of the dry dock; The remaining modules are assembled one by one according to the on-site hoisting and assembly steps; wherein, the positioning position of the lower hull along the second direction is determined by the number of turns of the cable on each mooring bollard recorded during the initial hoisting and assembly movement of the lower hull, and the second direction is the length direction of the lower hull.

2. The method for assembling and assembling large modules on water as described in claim 1, characterized in that, The step of selecting the lifting point location also includes the step of welding lifting lugs at each of the lower lifting points.

3. The method for assembling and assembling large modules on water as described in claim 2, characterized in that, The lifting lug is a cylindrical structure that protrudes from the outer surface of the module along the extension direction of the main crossbeam.

4. The method for assembling and assembling large modules on water as described in claim 3, characterized in that, The end of the lifting lug furthest from the module is also provided with a baffle, the area of ​​which is larger than the cross-sectional area of ​​the lifting lug.

5. The method for assembling and assembling large modules on water as described in claim 1, characterized in that, During the on-site hoisting and assembly step, the hook of the hoisting equipment can connect two adjacent lower lifting points on the same outer surface of the module via a steel wire rope.

6. The method for assembling and assembling large modules on water as described in claim 1, characterized in that, The straight-line distance between the first positioning part and the second positioning part along the first direction is the sum of the width of the lower hull and a preset distance W, where the preset distance W is equal to the interval distance between two adjacent modules arranged along the first direction.

7. The method for assembling and hoisting large modules on water according to claim 1, characterized in that, Along the second direction, the position where the lower hull first closes is defined as the first position, and the position where the lower hull second closes is defined as the second position. The distance L between the first position and the second position is equal to the center-to-center distance between two adjacent modules arranged along the second direction.

8. The method for assembling and hoisting large modules on water according to claim 7, characterized in that, The positioning device further includes a third positioning part, which is disposed in the dock and is capable of abutting against the stern of the lower hull at the first position.

9. The method for assembling and hoisting large modules on water according to any one of claims 1 to 8, characterized in that, During the descent and closure of the module, the ballast water of the lower hull is adjusted in real time according to the buoyancy of the lower hull in the water to keep the lower hull level at all times.

10. The method for assembling and assembling large modules on water as described in claim 9, characterized in that, The specific steps for adjusting the ballast water in the lower hull include: The draft difference between each ballast tank on the lower hull is obtained by using the water level marks set on the lower hull. Ballast water is discharged from the ballast tanks with high draft levels to adjust the buoyancy of the lower hull so that it remains level at all times.

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