CN117262154A - Water hoisting and folding method for large module - Google Patents

Abstract

The invention relates to a water hoisting and folding method for a large module, which comprises a lifting point position selection step, a positioning device preparation step and a field hoisting and folding step. In the on-site hoisting and folding step, the module is firstly transported into a dock, and the module is hoisted in the dock by hoisting equipment to be positioned at a height position. The lower hull is carried into the dock and positioned directly under the module, with the lower hull now abutting against the first positioning portion. And the module is fallen down on the lower ship body to complete the folding of the module. The design of the lower hanging point can effectively ensure that the whole stress of the module is uniform, and the stability of hanging the module is improved. The positioning device can effectively position the lower ship body in the dock, so that the lower ship body in a floating state is conveniently positioned, and each module can be accurately aligned when being folded and installed. The method is suitable for folding and installing the oversized module on the ship in the water dock, and can enable the module with similar structure and oversized weight to be folded and hoisted in the water dock completely and safely by means of the Taishan crane.

Description

Water hoisting and folding method for large module

Technical Field

The invention relates to the technical field of ships, in particular to a water hoisting and folding method for a large module.

Background

The floating production oil storage ship can be used for offshore oil storage, crude oil treatment, transportation and other operations, and is an important device for ocean deep water development. The whole ship is generally composed of a plurality of oversized modules and a lower hull. According to the current construction and hoisting closure process, a maximum 12000 ton floating crane in China cannot hoist truss type modules exceeding 6000 tons at fixed water depths, fixed amplitudes and heights.

The oversized module is generally in a truss structure, and the main materials of the oversized module are steel pipes, I-steel and other sectional materials in a staggered and crisscross mode. According to the classification of module functions, the structural section is different in thickness, irregular in structure and suitable for being placed with the lifting lug at random in main structure position. The interior of the module is provided with a plurality of devices, the total weight of the module can reach 6000 tons, and a plurality of modules are positioned at different positions on the deck surface of the lower hull. At present, the berthing of the 12000 floating crane in China has higher requirements on the water depth of a closed water area, the lifting capacity in a proper amplitude and lifting height cannot reach 6000 tons, the cost is high, and only the Taishan crane can meet the lifting load weight.

Because the lifting mode of the Taishan crane is mainly a crane row, the truss type module structure is not matched with the welding crane row. The proper position of the traditional four lifting points cannot be selected on the main structure of the module, and the required outline structure of the plate lifting lug adopted by the traditional four lifting points is very large and cannot be welded on the main structure. Therefore, a new method for folding the large-scale truss type module for the ship, which is independent of the foreign ten-thousand-ton floating crane, needs to be invented for the module with more than 6000 tons.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a water hoisting and folding method for a large module. In order to solve the technical problems, the invention adopts the following technical scheme:

a large module water hoisting and folding method is used for folding the large module to a preset position on the deck surface of a lower hull and comprises the following steps:

the lifting point position selection step: according to the positions of the main body vertical beams of the modules, respectively selecting 3 or 4 lower hanging points on two opposite outer surfaces of each module along the vertical direction, wherein the projections of the lower hanging points on the two outer surfaces on the horizontal plane are plane-symmetrical;

preparing a positioning device: the positioning device comprises a first positioning part and a second positioning part, the first positioning part and the second positioning part are respectively arranged at two sides of the dock along a first direction, the first direction is the width direction of the lower ship body, and the positioning device is used for limiting the position of the lower ship body in the dock;

and (3) hoisting and folding on site: the module is transported to a dock, and lifted by lifting equipment in the dock to be positioned at a height position; the lower hull is transported into the dock and positioned under the module, and the lower hull is propped against the first positioning part at the moment; and the module is fallen down on the lower ship body to complete the folding of the module.

In one embodiment, the lifting point position selecting step further includes the step of welding lifting lugs at each lower lifting point.

In one embodiment, the lifting lug is a cylindrical structure protruding from the outer surface along the extension direction of the main body beam of the module.

In one embodiment, the end of the lifting lug away from the module is further provided with a baffle, and the area of the baffle is larger than the sectional area of the lifting lug.

In one embodiment, in the on-site hoisting and folding step, the hooks of the hoisting device can be connected to two adjacent lower hoisting points on the same outer surface of the module by one wire rope.

In one embodiment, in the step of hoisting and folding in situ, when the hoisting device hoistes two modules arranged along the first direction at the same time, after the step of dropping the modules on the lower hull, the method further comprises:

and moving the lower ship body along the first direction until the lower ship body abuts against the second positioning part, and falling the other module on the lower ship body to finish the folding of the other module.

In one embodiment, the linear distance between the first positioning portion and the second positioning portion along the first direction is a sum of the width of the lower hull and a preset distance W, and the preset distance W is equal to the interval distance between two adjacent modules arranged along the first direction.

In one embodiment, after completing the folding step of the two modules arranged along the first direction, the method further comprises:

removing the lower hull from the dock;

the rest modules are folded and installed one by one according to the on-site hoisting and folding steps; the positioning position of the lower hull along the second direction is determined by the winding turns of the cables on each bollard recorded when the lower hull is lifted, folded and moved for the first time, and the second direction is the length direction of the lower hull.

In one embodiment, the first folding position of the lower hull is defined as a first position and the second folding position of the lower hull is defined as a second position along the second direction, and 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.

In one embodiment, the positioning device further comprises a third positioning portion arranged in the dock, the third positioning portion being capable of abutting against the lower hull tail in the first position.

In one embodiment, during the process of the module descending and folding, the ballast water of the lower hull is adjusted in real time according to the floating state of the lower hull in the water, so that the lower hull is always kept horizontal.

In one embodiment, the specific step of adjusting the ballast water of the lower hull comprises:

obtaining the draft water level difference of each ballast tank on the lower hull through a water gauge marking arranged on the lower hull;

the ballast tank with high draft level discharges the ballast water to adjust the floating state of the lower hull to keep the level all the time.

According to the technical scheme, the invention has at least the following advantages and positive effects:

the method for hoisting and folding the large module on water is suitable for folding and installing the oversized module on a ship in a water dock, and can ensure that the module with similar structure and oversized weight can be completely and safely hoisted in the water dock by means of a Taishan crane outside the floating crane operation with limited resources.

Specifically, through the design to the lower hoisting point, can effectively guarantee that the whole atress of module is even, improve the stationarity of module hoist and mount. The positioning device can effectively position the lower ship body in the dock, particularly can reliably position the ship moving position of the lower ship body in the dock along the width direction of the ship body, is convenient for positioning the lower ship body in a floating state, and can accurately align when the modules are folded and installed.

Drawings

Fig. 1 is a schematic flow chart of a method for lifting and folding a large module on water according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of module lifting in the method according to the embodiment of the invention.

Fig. 3 is a schematic view of the structure of fig. 2, as seen in the direction of arrow a.

Fig. 4 is a schematic view of the structure shown in fig. 3, as viewed in the direction of arrow B.

Fig. 5 is a schematic structural view of a lifting lug on a module in a method according to an embodiment of the invention.

Fig. 6 is a schematic view showing a state of the lower hull in the dock in the method according to the embodiment of the present invention.

Fig. 7 is a schematic view of the structure shown in fig. 6, as seen in the direction C-C, and in a state of step S31.

Fig. 8 is a schematic view of the structure shown in fig. 6, as seen in the direction C-C, and in a state of step S33.

Fig. 9 is a schematic structural view of a positioning device in the method according to the embodiment of the present invention.

The reference numerals are explained as follows:

10-lower hull;

20-module;

210-vertical beams; 220-a cross beam;

201-a lower hanging point; 211-lifting lugs; 212-baffle;

30-hoisting equipment; 301-a steel wire rope;

40-positioning device;

401-a first positioning portion; 402-a second positioning portion; 403-a third positioning portion;

41-positioning a bracket; 42-fixing the bracket;

50-barge.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It will be understood that the invention is capable of various modifications in various embodiments, all without departing from the scope of the invention, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the invention.

In the description of the present application, it should be understood that in the embodiments shown in the drawings, indications of directions or positional relationships (such as up, down, left, right, front, rear, etc.) are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or elements referred to must have a particular orientation, be configured and operated in a particular orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The method for hoisting and folding the large-scale modules on water is mainly suitable for hoisting and folding a plurality of oversized truss-type modules 20 on a floating production and storage ship. The oversized module 20 is generally a truss structure, and its main body materials are all formed by staggered cross sections such as steel pipes, i-beams and the like. According to the classification of the functions of the modules 20, the main body section bars of each module 20 are different in thickness and irregular in structure, and the positions suitable for placing lifting lugs are random. A number of devices are arranged inside each module 20, up to around 6000 tons in total, and a plurality of modules 20 are located at different positions on the deck of the lower hull 10.

Referring to fig. 1, the method for lifting and folding a large module on water according to the embodiment of the invention is used for folding the large module 20 to a preset position on the deck surface of the lower hull 10. The method comprises the following steps:

s10, a lifting point position selection step;

s20, preparing a positioning device 40; and

s30, hoisting and folding on site.

Specifically, as shown in fig. 2 and 3, in the hanging point position selection step S10, 3 or 4 hanging points 201 are now selected on vertically opposite outer surfaces of each module 20, respectively, according to the positions of the main body vertical beams 210 of the module 20. It will be appreciated that there are a total of 6 or 8 drop points 201 selected on each module 20.

It should be noted that, in this embodiment, each lower suspension point 201 is not just a certain point, and each lower suspension point 201 refers to a combination of points on the outer surface of the module 20 that are located on the same vertical line (for example, the same vertical beam 210). As shown in fig. 3, fig. 3 illustrates the location of 4 drop points 201 selected from one side surface of the module 20.

Wherein the projections of the respective lower suspension points 201 on the two outer surfaces on the horizontal plane are plane symmetrical. Referring to fig. 4, 4 lower suspension points 201 are selected on the outer surfaces of the two sides of the module 20, and the lower suspension points 201 on the outer surfaces of the two sides of the module 20 are corresponding to each other in pairs and are respectively symmetrical in plane. That is, the lower suspension points 201 on the outer surfaces of the two sides correspond to each other, and the projected connecting line of the corresponding two lower suspension points 201 (or two corresponding vertical lines can be understood as) on the horizontal plane can be vertically bisected by a vertical plane.

In other words, when a lower suspension point 201 is selected on the outer surface of one side of the module 20, a lower suspension point 201 should be provided at a corresponding position on the outer surface of the other side of the module 20. Thereby ensuring the uniform overall stress of the module 20 and improving the stability of hoisting the module 20.

In this embodiment, in the lifting point position selecting step S10, after the lower lifting points 201 are selected, a step of welding the lifting lugs 211 at the respective lower lifting points 201 is further included.

Referring to fig. 5, in one embodiment, the lifting lug 211 is a cylindrical structure protruding from the outer surface of the module 20 along the extending direction of the main beam 220 of the module 20. Specifically, the lifting lug 211 may directly adopt a circular steel pipe structure, and may be vertically welded at a selected position. Thereby being convenient for the steel wire rope 301 used for hoisting to be directly sleeved on the steel pipe and being convenient for hoisting. In this embodiment, the lifting lug 211 is welded to the extension of the beam 220 and is located at the cross connection of the beam 220 and the vertical beam 210 of the module 20, where the structural strength is great and the welding space is great. Thereby enabling the lifting lug 211 to meet the lifting strength requirement and improving the lifting reliability.

Further, as shown in fig. 5, the end of the lifting lug 211 away from the module 20 is further provided with a baffle 212, and the area of the baffle 212 is larger than the sectional area of the lifting lug 211. It will be appreciated that the inner diameter of the loop of the wire rope 301 is substantially the same as the cross-sectional diameter of the shackle 211 when the wire rope 301 is fitted over the shackle 211. Therefore, in this embodiment, the area of the baffle 212 is further larger than the cross-sectional area of the ferrule of the steel wire rope 301, so that the situation that the steel wire rope 301 falls off from the lifting lug 211 during lifting can be effectively avoided by arranging the baffle 212, and the lifting reliability is effectively improved.

Referring to fig. 6, in the preparation step S20 of the positioning device 40, the positioning device 40 includes a first positioning portion 401 and a second positioning portion 402, and the first positioning portion 401 and the second positioning portion 402 are disposed on both sides of the dock along a first direction (denoted by X), which is a width direction of the lower hull 10. The positioning means 40 are used to define the position of the lower hull 10 in the dock. By providing the positioning means 40, the position of the lower hull 10 in the dock can be effectively positioned. In particular, the positioning device 40 can reliably position the ship moving position of the lower hull 10 in the dock along the first direction X, and the positioning process of the positioning device 40 on the lower hull 10 will be specifically described in connection with the hoisting and folding process.

It should be noted that, in the embodiment of the present application, the lifting point position selecting step S10 and the preparing step S20 of the positioning device 40 are not strictly sequential, and the two steps may be performed simultaneously.

Referring to fig. 1, the step S30 of field hoisting and folding specifically includes:

s31, the module 20 is transported into the dock by the barge 50, and the module 20 is lifted to a height position in the dock by the lifting device 30, as schematically shown in FIG. 7. Wherein the lifting apparatus 30 is an existing large tonnage platform crane, commonly referred to as a Taishan crane. Because the specific structure of the Taishan crane is the prior art, the detailed description will not be repeated here.

As shown in connection with fig. 2, two sets of lifting lugs 211 on the outer surfaces of both sides of the module 20 are respectively located right under two main beams of the thai mountain crane.

In this step S31, the manner of hoisting connection between the hoisting device 30 and the module 20 may be: the hooks of the lifting device 30 can be connected to two adjacent lower lifting points 201 on the same outer surface of the module 20 by one wire rope 301.

Specifically, as shown in fig. 3, when 4 lower hanging points 201 are respectively provided on each outer surface of the module 20, one hook of the hanging device 30 connects two lower hanging points 201 adjacent to each other by using one wire rope 301, and the remaining two lower hanging points 201 adjacent to each other are hung on the other hook of the hanging device 30 by the other wire rope 301.

It will be appreciated that when 3 lower suspension points 201 are provided on each outer surface of the module 20, respectively, one hook of the suspension device 30 connects two lower suspension points 201 adjacent to each other by means of one wire rope 301, and the remaining lower suspension point 201 is suspended on the other hook of the suspension device 30 by means of one wire rope 301 alone.

In this embodiment, when one wire rope 301 connects two adjacent lower hanging points 201 on the same outer surface of the module 20, since the wire rope 301 can rotate back and forth at the hook of the hanging device 30, two ends of the wire rope 301 are respectively sleeved on the cylindrical lifting lugs 211 of the two lower hanging points 201, and the wire rope 301 can also rotate freely along the length direction of the lifting lugs 211. Therefore, the lifting mode can change the mode of hyperstatic stress of multiple lifting points, so that the whole lifting system is balanced, the unexpected deformation danger to the modules 20, the crane, the lifting beam, the rigging and the like is avoided, and the lifting requirement is met.

It will be appreciated that after the modules 20 are lifted, the barge 50 is transported out of the dock. Then, the step S30 of hoisting and folding on site further includes a step S32 of transporting the lower hull 10 into the dock and positioning the lower hull 10 directly under the module 20, where the lower hull 10 abuts against the first positioning portion 401. And

In step S33, the module 20 is folded by dropping the module 20 onto the lower hull 10.

As shown in fig. 6 and 8, the lower hull 10 is moored to the side against the first positioning portion 401, i.e., directly below the module 1, by the traction and control of the docking cable. After the lower hull 10 is fixed, the module 1 descends and starts to perform alignment and closure.

With continued reference to fig. 6 and 8, in the on-site hoisting and folding step S30, when the hoisting device 30 simultaneously hoistes two modules 20 arranged along the first direction X, after the step of dropping the module 20 (the module 20 at this time is the module 1) onto the lower hull 10, the step S34 is further included:

the lower hull 10 is moved along the first direction X to abut against the second positioning portion 402, and the other module 20 (module 2) is dropped onto the lower hull 10 to complete the folding of the other module 20.

Specifically, as shown in fig. 6, if the modules 1 and 2 are once transported into the dock by the barge 50, and the modules 1 and 2 are lifted by the lifting device 30 at the same time, and then the modules 1 are assembled by folding in the steps S32 and S33, each bollard can move the underwater lower hull 10 by loosening or tightening the cable so as to be abutted against the second positioning portion 402. After the lower hull 10 is fixed, the module 2 descends and starts to perform alignment and closure. Thereby, the hoisting and folding process of the two modules 20 can be continuously completed, and the working efficiency is effectively improved.

Note that, the sum of the width of the lower hull 10 and the preset distance W of the first positioning portion 401 and the second positioning portion 402 along the first direction X is equal to the interval distance between two adjacent modules 20 arranged along the first direction.

For example, referring to fig. 6, two modules 20 (e.g., module 1 and module 2) typically disposed along the width of the lower hull 10 are typically spaced apart by 1 meter. Because the distance of 1 meter is too small to be adjusted by calculating the winding turns of the cable, the ship moving distance of the lower ship 10 along the first direction can be effectively positioned by positioning the first positioning part 401 and the second positioning part 402 preset in the dock, and the alignment and closure precision of the two modules 20 is improved.

Further, referring to fig. 1, after the closing step of the two modules 20 arranged in the first direction is completed, step S35 is further included:

removing the lower hull 10 from the dock; the remaining modules 20 are assembled one by one according to the on-site hoisting and assembling step S30.

Specifically, as shown in fig. 6, after the folding of the modules 1 and 2 is completed, the remaining modules 3 and 4 are also folded and installed. At this time, the lower hull 10 is first moved out of the dock. The modules 3 and 4 are then transported into the dock by the barge 50 and the modules 3 and 4 are lifted in the dock using the lifting device 30. The lower hull 10 is carried into the dock and positioned directly under the module 3, with the lower hull 10 abutting against the first positioning portion 401. The module 3 is lowered onto the lower hull 10 to complete the folding of the module 3. Then, the lower hull 10 is moved along the first direction X until the lower hull 10 abuts against the second positioning portion 402, and the module 4 is folded on the lower hull 10.

The modules 3 and 4 are located at different positions in the longitudinal direction of the lower hull 10 with respect to the modules 1 and 2, respectively. Therefore, when the folding of the modules 1 and 2 is completed and the folding installation of the modules 3 and 4 is to be performed, it is necessary to reposition the position of the lower hull 10 in the dock along the length direction of the lower hull 10. Based on this, the positioning position of the lower hull 10 in the second direction (denoted Y) during the lifting and closing of the modules 3 and 4 is determined by the number of windings of the cable on each bollard recorded during the initial lifting and closing movement of the lower hull 10. The second direction Y is the longitudinal direction of the lower hull 10.

Specifically, in the second direction Y, the position where the lower hull 10 is primarily folded is defined as a first position, and the position where the lower hull 10 is secondarily folded is defined as a second position. The distance L between the first position and the second position is equal to the center-to-center spacing of two adjacent modules 20 arranged in the second direction.

It will be appreciated that the first position is where the lower hull 10 is in the dock when the modules 1 and 2 are installed in close proximity and the second position is where the lower hull 10 is in the dock when the modules 3 and 4 are installed in close proximity. As shown in fig. 6, when the lower hull 10 is in the second position, the modules 3 and 4 should coincide with the previous central positions of the modules 1 and 2. That is, the lower hull 10 needs to be moved in the arrow D direction by a distance L on the basis of the first position to reach the second position. This distance L is equal to the center-to-center spacing of modules 1 and 3 or distance L is equal to the center-to-center spacing of modules 2 and 4. The position of the lower hull 10 to close the installation modules 3 and 4 can thus be determined by the number of turns of cable wound on each bollard recorded when the lower hull 10 closes the installation modules 1 and 2, in combination with the distance L.

Preferably, the positioning device 40 further comprises a third positioning portion 403 arranged in the dock, the third positioning portion 403 being capable of abutting against the tail of the lower hull 10 in the first position. The third positioning portion 403 can accurately define the position of the lower hull 10 in the second direction when the lower hull is first folded, so as to ensure accurate alignment of the module 20.

In the embodiment of the present application, the first positioning portion 401, the second positioning portion 402, and the third positioning portion 403 may have the same structure. Referring to fig. 9, each positioning portion may have a structural form: comprises a positioning bracket 41 and a fixing bracket 42 which are connected, wherein the positioning bracket 41 is used for propping against the lower ship body 10, and the fixing bracket 42 is used for being fixedly connected with the bottom surface of the dock. The positioning bracket 41 and the fixing bracket 42 can be made of sectional materials and are connected and formed in a welding mode.

In the step S30 of hoisting and folding on site, in the process of folding the module 20 in a descending manner, the ballast water of the lower hull 10 is adjusted in real time according to the floating state of the lower hull 10 in the water, so that the lower hull 10 always keeps horizontal.

It will be appreciated that the lower hull 10 is provided with ballast tanks at various locations, each of which can be filled with water and drained to effect load shedding of the lower hull 10. Because the hoist and fold method of the present embodiment operates on the water surface in the dock, the lower hull 10 needs to be filled with water in each ballast tank inside after being launched to keep the lower hull 10 horizontal and floating on the water surface, then is towed into the dock by the barge 50, and finally is controlled to be positioned by the bollards and the cables.

When the lower hull 10 is in place, the module 20 begins to descend onto the deck mounting surface of the lower hull 10, and as the module 20 descends, the load on the lower hull 10 increases. Because the modules 20 are lowered and folded at different positions on the deck of the lower hull 10, each module 20 will cause uneven stress on the lower hull 10 and result in tilting of the lower hull 10. Thereby maintaining the lower hull 10 in a horizontal floating condition at all times by draining different ballast tanks of the lower hull 10 outwardly as needed. The drainage is stopped until the module 20 is completely dropped onto the lower hull 10, and the entire ship is maintained in a horizontally floating state.

In detail, the specific steps of adjusting the ballast water of the lower hull 10 include:

the draft water level difference of each ballast tank on the lower hull 10 is obtained through a water gauge marking arranged on the lower hull 10;

the ballast tank with high draft is discharged to adjust the floating state of the lower hull 10 to be kept horizontal all the time.

Specifically, the draft level of each ballast tank may be obtained by a scale mark provided on the outer peripheral surface of the lower hull 10, and the draft difference of each ballast tank may be obtained from the draft level of each ballast tank. For example, during the descent of a certain module 20 to the lower hull 10, the draft of the ballast tank at the location corresponding to that module 20 will rise and form a large water head with the draft of the other ballast tanks. At this time, by discharging the ballast water to the outside through the ballast tanks at the corresponding positions of the modules 20, the weight center balance of the entire lower hull 10 can be adjusted, so that the lower hull 10 maintains a horizontal floating posture.

It can be appreciated that in the process of lowering and folding each module 20, the ballast water of the lower hull 10 needs to be adjusted in real time according to the floating state of the lower hull 10 in the water, so that the lower hull 10 is always kept horizontal, and the accurate alignment and folding of each module 20 in the process of water hoisting operation is effectively ensured.

In other embodiments, the buoyancy of the lower hull 10 may be adjusted to remain horizontal at all times by filling ballast tanks with ballast water at low draft levels.

According to the technical scheme, the method for hoisting and folding the large module on water has the following beneficial effects:

by selecting the position of the main structure (vertical beam 210) of the oversized module 20 as the lower suspension point 201, a steel pipe made of the same material extends vertically for a sufficient length to serve as a cylindrical lifting lug 211, so that interference between the oversized module 20 and other structures and devices is avoided. Each module 20 is provided with 6 or 8 lower hanging points 201, so that the problem that the traditional 4 hanging points are over-stressed is solved. And through the design to the position of the lower lifting point 201, the overall stress uniformity of the module 20 is effectively ensured, and the stability of lifting the module 20 is improved.

In addition, the mode that 1 wire rope is used for connecting 2 lower hanging points 201 effectively changes the mode of statically indeterminate stress of a plurality of hanging points, so that the whole hoisting system is balanced, the unexpected deformation danger to the modules 20, the crane, the hanging beam, the rigging and the like is avoided, and the hoisting requirement is met.

According to the method, the design of the lower hanging point 201 and the lifting lug 211 and the design of the mode of connecting the lower hanging point 201 are adopted, so that the hoisting and folding of the large module 20 can be realized through the conventional Taishan crane. The method does not limit hoisting due to the lack of floating hoisting resources and the high cost caused by the special structure of the module 20 and the increase of the number of hoisting points on the module 20.

The method of the present invention can effectively position the lower hull 10 in the dock by providing the positioning means 40. Particularly, the ship moving position of the lower ship body 10 in the dock along the width direction of the ship body can be reliably positioned, the positioning of the lower ship body 10 in a floating state is facilitated, and the modules 20 can be accurately aligned when being folded and installed.

By adjusting the ballast water of the lower hull 10 in real time according to the floating state of the lower hull 10 in the water, the lower hull 10 is always kept horizontal, and the alignment precision of the folding installation of the modules 20 can be effectively improved.

The above embodiments are merely illustrative of structures, and the structures in the embodiments are not fixedly matched and combined structures, and in the case of no structural conflict, the structures in the embodiments can be arbitrarily combined for use.

While the invention has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (12)

1. The method for hoisting and folding the large module on water is used for folding the large module to a preset position on the deck surface of a lower hull and is characterized by comprising the following steps of:

the lifting point position selection step: according to the positions of the main body vertical beams of the modules, respectively selecting 3 or 4 lower hanging points on two opposite outer surfaces of each module along the vertical direction, wherein the projections of the lower hanging points on the two outer surfaces on the horizontal plane are plane symmetrical;

preparing a positioning device: the positioning device comprises a first positioning part and a second positioning part, the first positioning part and the second positioning part are respectively arranged on two sides of the dock along a first direction, the first direction is the width direction of the lower hull, and the positioning device is used for limiting the position of the lower hull in the dock;

and (3) hoisting and folding on site: transporting the module to the dock, and lifting the module to a height position in the dock by using lifting equipment; carrying the lower hull into the dock and positioning directly under the module, wherein the lower hull abuts against the first positioning portion; and the module falls down on the lower ship body to finish the folding of the module.

2. The method of lifting and closing a large module on water according to claim 1, wherein the lifting point position selecting step further comprises the step of welding lifting lugs at each of the lower lifting points.

3. The method for lifting and folding a large module on water according to claim 2, wherein the lifting lug is a cylindrical structure protruding from the outer surface along the extending direction of the main body beam of the module.

4. The method for lifting and folding a large module on water according to claim 3, wherein a baffle is further arranged at the end, away from the module, of the lifting lug, and the area of the baffle is larger than the sectional area of the lifting lug.

5. The method of on-water lifting and closing a large module according to claim 1, wherein in the on-site lifting and closing step, the hooks of the lifting device are capable of connecting two adjacent lower lifting points on the same outer surface of the module through one wire rope.

6. The method of lifting and folding a large module on water according to claim 1, wherein in the step of lifting and folding on site, when the lifting device lifts two modules arranged in the first direction at the same time, after the step of dropping the modules on the lower hull, further comprising:

and moving the lower ship body along the first direction until the lower ship body is propped against the second positioning part, and falling the other module on the lower ship body to finish the folding of the other module.

7. The method of on-water lifting and folding of a large module according to claim 6, wherein a linear distance between the first positioning portion and the second positioning portion along the first direction is a sum of a width of the lower hull and a preset distance W, and the preset distance W is equal to a spacing distance between two adjacent modules arranged along the first direction.

8. The method of water lifting and folding a large module of claim 6, further comprising, after completing the folding steps of two of said modules arranged in said first direction:

removing the lower hull from the dock;

the rest modules are folded and installed one by one according to the on-site hoisting and folding steps; the positioning position of the lower hull along the second direction is determined by the winding number of the cables on each bollard recorded when the lower hull is lifted, folded and moved for the first time, and the second direction is the length direction of the lower hull.

9. The method of lifting and folding a large module on water according to claim 8, wherein a first position is defined as a first position of the lower hull when the lower hull is first folded and a second position is defined as a second position of the lower hull when the lower hull is second folded, and a distance L between the first position and the second position is equal to a center-to-center distance between two adjacent modules arranged along the second direction.

10. The method of lifting and folding a large module on water of claim 9, wherein the positioning device further comprises a third positioning portion, the third positioning portion being disposed in the dock, the third positioning portion being capable of abutting against the lower hull tail in the first position.

11. The method of lifting and folding a large module on water according to any one of claims 1 to 10, wherein the ballast water of the lower hull is adjusted in real time according to the floating state of the lower hull in the water during the lowering and folding of the module, so that the lower hull is always kept horizontal.

12. The method of lifting and folding a large module on water of claim 11, wherein the specific step of adjusting the ballast water of the lower hull comprises:

obtaining draft water level differences of each ballast tank on the lower hull through water gauge marked lines arranged on the lower hull;

and discharging the ballast water from the ballast tank with high draft water level to adjust the floating state of the lower hull so as to keep the lower hull horizontal all the time.