Wind power equipment installation transport ship structure design method

Abstract

The invention relates to a wind power equipment installation transport ship structure design method, and belongs to the technical field of ship and ocean engineering, a continuous middle longitudinal wall is arranged between an operation deck and an outer plate, an inner wall and the middle longitudinal wall are determined according to the size of a pile leg, and a main deck, an inner bottom, the outer plate and the middle longitudinal wall are of a continuous structure and bear the total longitudinal strength; the local platform and the inner wall are of a local structure and do not bear the total longitudinal strength. A cabin defined by the main deck and the inner bottom is a cargo hold, the cargo hold is of a full-through structure from the bow to the tail of the ship body, the ship is of a ship body structure with discontinuous structural strength in the transverse direction, and the discontinuous strength comprises a structure without a transverse bulkhead, a supporting column and a typical strong frame. The ship width is greatly optimized, so that the structural stress level under the torque effect is reduced, a feasible scheme is provided for the design of a transverse bulkhead-free structure of the ship, and due to the implementation of the transverse bulkhead-free structure design, it can be guaranteed that the pile legs are stored in a cargo hold, and transportation is convenient.

Description

Technical Field

[0001] The present invention relates to a wind power equipment installation and transportation ship, in particular to a typical structure of a wind power equipment installation and transportation ship, belonging to the technical field of ships and marine engineering. Background Art

[0002] Existing wind power equipment installation and transport ships carry a limited number of wind turbine blades, and the installation speed is particularly slow. The operation process often requires lowering the pile legs for positioning, and then retrieving the pile legs after the operation is completed. Since wind power equipment transport ships have very high requirements for the operation window period, existing wind power equipment transport ships have many difficult-to-solve drawbacks in the existing operating environment.

[0003] In addition, with the explosive growth of the wind power industry in recent years, many wind turbine pile legs have destroyed ocean navigation area planning or have been damaged or fallen into disrepair. If the original pile legs can be directly recovered and transported directly, and the blades can also be directly transported, this type of ship will be of great use in the future.

[0004] Based on this, there is a type of wind power equipment installation and transportation ship that relies on a single pile to achieve positioning, and can completely arrange the blades and pile legs in the main hull. According to its type value, it can be known that its main control load is the sagging bending moment, that is, the total longitudinal strength is the primary strength indicator. However, due to reasons such as the floating installation of wind power pile legs, the cargo hold is a full-through structure, which is very different from the existing ship types. The total longitudinal strength of the main hull can be guaranteed by combining the outer plate, continuous longitudinal wall and main deck, but the lateral strength related to the lateral load and the strength under the action of torque are issues that the existing technology cannot provide reference or solve. Summary of the invention

[0005] The existing wind power equipment installation and transportation ships cannot guarantee the simultaneous transportation of blades and pile legs, while the new ship type currently proposed has the problem that the lateral strength and local strength are difficult to meet the strength requirements.

[0006] In order to solve the above problems, the present invention proposes a typical cross-sectional structure, a typical strong frame structure, a typical large strong frame structure and a cross-sectional structure at the position of a pile holding system of a wind power equipment installation and transportation ship.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a method for designing the structure of a wind power equipment installation and transportation ship, which comprises, from top to bottom, an operating deck, a main deck, a local platform, an inner bottom, and an outer plate. A continuous middle longitudinal wall and an inner wall are arranged between the operating deck and the outer plate. The middle longitudinal wall is determined according to the size of the pile legs and is not located at the center of the hull. The main deck, the inner bottom, the outer plate and the middle longitudinal wall are continuous structures that bear the total longitudinal strength. The operating deck, the local platform and the inner wall are local structures that do not bear the total longitudinal strength. The cabin enclosed between the main deck and the inner bottom is a cargo hold. The cargo hold is a fully through structure from the bow to the stern of the hull. The transverse direction of the ship is a hull structure with discontinuous structural strength. The discontinuous strength includes no transverse bulkheads, no pillars, and no typical strong frame structure. The typical strong frame structure is a hull reinforcement structure with continuous structural strength.

[0008] Preferably, according to the structural design method, a typical cross-sectional structure of a wind power equipment installation and transportation ship is obtained, wherein from port to starboard, the main component plates are respectively the port side outer plate, the inner wall, the middle longitudinal wall, the working deck lower wall, and the starboard side outer plate; and there is also a side flared structure, wherein the method for determining the lateral position of the middle longitudinal wall is to deduct the space required for the maximum design pile leg size, and the web height requirement of the girder is not less than the layer height span from the main deck to the inner bottom as the design principle, the width of the flared structure is determined according to the effective width of the contact blade, and in order to limit the ship width, the width of the flared structure is based on not affecting the reliability of blade transmission, and from port to starboard, the secondary component plates are divided into a large bracket support structure, an ordinary beam structure, and a rib structure between the inner bottoms, and the large bracket support structure is located under the main deck, and the free edge is an arc shape.

[0009] Preferably, the working deck is located on one side of the hull and has a large opening, and the large opening is used to store the blade bracket. The cabin space enclosed by the working deck and the main deck is supported by pillars, and the pillars are arranged every 20 levels, and the pillars are aligned with the inner wall. The height between the working deck and the main deck is determined according to the height of the lowest layer of blades on the blade bracket from the main deck and the number of layers of blades, and is not less than 2 / 3 of the height of the center axis of the lowest layer of blades from the main deck, and the blades are not more than 3 layers. The main deck is provided with a pin above one side of the opening, and the pin is an L-shaped pin, and the L-shaped pin is used to fix the blade bracket; the longitudinal reinforcing girder structure under the main deck is determined according to the span from the middle longitudinal wall under the main deck to the adjacent farthest bulkhead, and the positioning position of the longitudinal girder is determined according to the position of the L-shaped pin, and the longitudinal reinforcing girders under the main deck other than these are distributed according to equally spaced rib distances.

[0010] Preferably, a large toggle plate for positioning the pile legs is provided on the inner bottom, the inner bottom height h is determined according to the loading condition, and an elastic pad is provided on the large toggle plate to fit the outer diameters of the pile legs of various diameters, the pile leg diameter D0≤10m, the pile leg length L0≤100m, and the distance between the free edge of the large toggle plate and the outer diameter of the pile leg does not exceed 350mm; the width of the installed blade is 5 meters, and the width of the external floating structure is 3.9 meters; the blade is placed obliquely on the bracket, the width of the blade bracket is 11.2 meters, and the width of the large opening is 12 meters.

[0011] Preferably, the large bracket support structure is used to reduce the ship length, ship width, molded depth and other hull values, thereby ensuring the lateral strength of the hull without transverse bulkheads, pillars and typical strong frame structures.

[0012] Preferably, the length of the pile leg is L0 / m, the diameter of the pile leg is D0 / m, and the volume of the ballast water in the forepeak tank is V0 / m 3 , then the width of the cargo hold area B1 is B1≥3D0+0.8, the ship width B is B=B1+B2, and the ship length L is L≥L0+V0 / (B×h).

[0013] Preferably, the common cross beam is arranged every 4 rib distances, the rib distance of each level is 0.6m, and the web height of the cross beam does not exceed 0.3m; the large bracket plate structure includes the large bracket plate supporting structure and the large bracket plate, and the large bracket plate structure is arranged every 20 levels. The large bracket plate structure is distributed in the cargo hold and is located at the four corners of the space enclosed by the pile legs and the cargo hold wall, and the four corners are respectively located below the main deck and above the inner bottom.

[0014] Preferably, the inner wall is set to be discontinuous in the equipment compartment area, and the discontinuity specifically refers to strength discontinuity, that is, there is an intermittent structure in the hull material. For the cabin with watertight requirements, it can be achieved by other ways that can achieve watertightness. One side of the inner wall is the ballast water tank and the generator compartment and engine compartment separated by the platform. The other side of the inner wall is the cargo hold where the pile legs are placed. The pressure on both sides of the inner wall is unbalanced, causing the inner wall to bear a large shear force. The thickness of the inner wall plate and the reinforcement specifications of the frame material are determined according to the design loading calculation of the typical shear force condition. The width B2 of the local cabin enclosed by the inner wall to the side outer plate is determined according to the size of the control motor of the pile holding system and the web height required for the cabin structure strength. The pile holding system is arranged in a closed space surrounded by the inner wall, the local platform and the main hull, and the pile holding system is controlled by an engine to realize the rotation of the pile holding system. The height of the web of the girder on the other side where the local platform is connected to the inner wall meets the requirement of the local strength for the web height of the girder without interfering with the pile leg diameter of the maximum design value; the engine is arranged on the inner bottom, and a base is arranged under the engine. The base panel is in the same plane and the end is not enlarged, so as to control the ship width. The base is welded along the inner wall, the inner bottom and the side, and the base is beveled at the panel at the contact position of the side outer plate and the contact position with the inner wall, and the generator is arranged on the main deck.

[0015] Preferably, the large bracket is provided with an opening at the pipeline crossing position, and the bracket structure is without an opening for the position without pipeline crossing; a solid wooden block is arranged between the two longitudinal bones below the main deck where the distance between the main deck and the pile legs is closest; the longitudinal dimension of the solid wooden block is the distance between the crossbeams, the transverse dimension is the distance between the longitudinal bones, and the height is the height of the longitudinal bones; a slot is arranged in the middle of the two large bracket structures above the inner bottom, and the width of the slot is smaller than the diameter of the pile legs to be transported.

[0016] Preferably, there are no more than 3 layers of blades; the height between the working deck and the main deck is not less than 2 / 3 of the height of the central axis of the lowest layer of blades from the main deck; the bulkhead on the side of the large opening of the working deck is aligned with the middle longitudinal wall; the space enclosed between the middle longitudinal wall and the side of the working deck is supported by pillars, which are arranged every 20 steps, and the pillars are aligned with the inner wall I.

[0017] The cross-sectional structural design of this ship greatly optimizes the ship width, thereby reducing the structural stress level under the action of torque, and provides a feasible solution for the ship's transverse bulkhead-free structural design. It is precisely because of the realization of the transverse bulkhead-free structural design that the pile legs can be kept in the cargo hold for easy transportation.

[0018] Therefore, the solutions proposed in the present invention have all been solved for the technical problems mentioned in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A typical cross-sectional view of a wind power equipment installation transport ship structure of the present invention;

[0020] Figure 2 A cross-sectional schematic diagram of a wind power equipment installation transport ship structure including a pile holding system according to the present invention;

[0021] Figure 3 A typical strong frame schematic diagram of a wind power equipment installation transport ship structure of the present invention;

[0022] Figure 4 It is a cross-sectional structural schematic diagram of a typical large strong frame of a wind power equipment installation transport ship structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of a wind power equipment installation transport ship according to the present invention, which includes wind turbine blades and wind turbine legs;

[0024] Figure 6 This is a schematic diagram of the structure of a wind power equipment installation and transportation ship according to the present invention, including under-deck girders;

[0025] Figure 7 A schematic diagram of a wind power equipment installation transport ship structure with liquid tanks and cargo holds marked thereon according to the present invention;

[0026] Figure 8 A schematic diagram of stress results of a structural plate frame of a wind power equipment installation transport ship according to the present invention;

[0027] Fig. 9 This is a schematic diagram of the stress results of the structural aggregates of a wind power equipment installation transport ship according to the present invention.

[0028] Figure numerals: 1. working deck; 2. main deck; 3. local platform; 4. inner bottom; 5. outer plate; 6. port side outer plate; 7. inner wall; 8. middle longitudinal wall; 9. lower wall of working deck; 10. starboard side outer plate; 11. side flaring structure; 12. pile leg; 13. blade; 14. L-shaped pin; 15. blade bracket; 16. steel material; 17. solid wood block. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The embodiment of the present invention discloses a method for designing a wind power equipment installation transport ship structure. Figure 1 FIG. 2 shows a typical cross-sectional view of a method for implementing the present invention.

[0031] The horizontal plates from top to bottom are respectively the working deck 1, the main deck 2, the local platform 3, the inner bottom 4, and the outer plate 5. The main deck 2, the inner bottom 4, and the outer plate 5 are continuous structures, bearing the total longitudinal strength, the working deck 1 has a large opening on the starboard side, and contributes slightly less to the total longitudinal strength, and the local platform 3 is a local structure, not bearing the total longitudinal strength.

[0032] The plates from the port side to the starboard side are respectively the port side outer plate 6 , the inner wall 7 , the middle longitudinal wall 8 , the lower surrounding wall of the working deck 9 , and the starboard side outer plate 10 .

[0033] In addition, there is a side outboard structure 11.

[0034] like Figure 2 As shown, a cross-sectional schematic diagram of a pile holding system is shown. The rack for storing blades 13 is placed in the opening area of ​​the working deck 1 and placed on the main deck 2. The pile legs 12 are placed in the cargo hold formed by the main deck 2 and the inner bottom 4, wherein one pile leg 12 can be placed in the port cargo hold and two pile legs can be placed in the starboard cargo hold. Another compartment adjacent to the port cargo hold is a ballast tank, and inside the ballast tank, an engine is provided at the position of the pile holding system, and a generator for controlling the pile holding system is placed at the position of the local platform 3 above the engine.

[0035] The cross-sectional structures of a typical strong frame and a typical large strong frame are as follows: Figure 3 as well as Figure 4 shown.

[0036] The technical solution and the corresponding design method proposed in the present invention are explained with specific embodiments.

[0037] Since this type of ship does not have a transverse bulkhead structure, at the beginning of the design, in addition to considering that the total longitudinal strength needs to meet the design requirements, the control load related to the strength of the transverse members should also be considered, especially the torque, which is obtained by integrating along the circumference of the cross section. Under different loading conditions and different sea conditions, the torque will also show different characteristics. Since the main pressure in the transverse direction is the uniformly distributed pressure of ballast water under different loadings, the torque design value is proportional to the square of the ship width. In order to reduce the torque level, the ship width should be limited as much as possible during design.

[0038] Take 9 wind turbine blades 13 with a length of 120m and a maximum width of 5m and 3 wind turbine legs 12 with a diameter of 6.5m as an example. Figure 5 shown.

[0039] Figure 6 The structural features of the underdeck girder are shown. Figure 6In the structure, solid wood is set between the large brackets to transfer the lateral load through deformation, avoiding stress concentration of small steel sections at this point.

[0040] First, regarding the design of the longitudinal wall spacing, the distance between the starboard outer plate 5 and the middle longitudinal wall 8 is determined to be 13.8m according to the designed leg 12 size of 6.5m, and the distance between the middle longitudinal wall 8 and the inner wall 7 is determined to be 7.3m. Then, according to the size of the engine, the distance from the inner wall 7 to the port outer plate 5 is determined to be 3.9m. The flare structure is mainly determined by the width of the blade 13. Since the width of the blade 13 in this example is 5m, the effective width in contact with the ground is approximately 4m, so the width of the flare structure on both sides of the hull is designed to be 3.9m under the condition of limiting the ship width.

[0041] Then, regarding the design of deck height, the stability of the rack of wind turbine blades 13 is mainly considered from the highest working deck 1 to the main deck 2. In this case, since there are 9 blades 13 in 3 rows, the center of gravity of the blades 13 in the bottom layer is basically guaranteed to be within the height of the working deck 1, and it is considered that there is no problem with the stability of the rack of blades 13. Therefore, the distance from the working deck 1 to the main deck 2 is 3.5m. The design factors of the height between the main deck 2 and the inner bottom 4 mainly consider the 6.5m clearance required for the pile legs 12, and the girders required for the span of the main deck 2. The height is 0.4m, and the effective height of the leg 12 positioning pad on the inner bottom 4, so the height between the main deck 2 and the inner bottom 4 is designed to be 8m. The height design of the local platform 3 mainly considers the girder height requirement of 0.6m on the back of the local platform 3, because it is necessary to avoid interference with the leg 12. At the same time, the position of the girder should also be considered to meet the size requirements of the generator after deducting the girder height; the double bottom height considerations are mainly the capacity requirements of the ballast water, fuel oil, fresh water tanks and other compartments. In this example, the double bottom height is designed to be 2m.

[0042] according to Figure 3 The typical cross section shown is used for verification. Figure 7 As shown, the compartment marked A is a liquid tank, including a ballast tank, a fresh water tank, a fuel tank, etc. The liquid density is set according to the ballast tank, and the compartment marked B is a cargo hold. Considering the load of the blade 13 on the outer floating structure, the load of the blade 13 rack on the main deck 2, and the uniform load of the pile leg 12 on the inner bottom 4, the net water load results obtained by the specification and the wave load calculation are applied to verify the strength of the structure under the condition that the liquid tanks are fully loaded. The obtained plate frame and frame stress results are shown as follows: Figure 8 as well as Fig. 9 shown.

[0043] Specifically, the present invention includes a structural profile design method for a ship type that can take into account the transportation of wind turbine pile legs 12 and wind turbine blades 13, and a feasible structural design based on the method; the hull structure obtained by the design method is a full-through structure, without transverse bulkheads, without pillars, and without a typical strong frame structure; the full-through structure is a full-through structure from the main hull stern cover plate to the front end of the hull bow; the typical structure includes an operating deck 1, a main deck 2, a local platform 3, an inner bottom 4, an outer plate 5, an inner wall I, an inner wall II, a middle longitudinal wall 8 and an outer flare structure in the longitudinal direction; the typical structure includes a large elbow plate structure, an ordinary beam structure, and a rib plate structure between the inner bottom 4 in the transverse direction.

[0044] When there is no transverse bulkhead, no pillar, and no typical strong frame structure, the transverse large bracket structure is mainly relied on to meet the transverse strength requirements of the hull, and the hull type values ​​such as ship length, ship width, and molded depth are reduced; the large bracket structure is a discontinuous structure in the transverse direction, which includes the horizontal direction and the vertical direction; the transverse discontinuous structure refers to a hull structure with obvious differences in component sizes, specifically referring to a hull structure with discontinuous structural strength.

[0045] The working deck 1 has a large opening, and the large opening is used to store the wind turbine blade bracket 15 .

[0046] The main deck 2, the inner bottom 4 and the outer plate 5 are continuous structures. A bracket for positioning the pile legs 12 is arranged on the inner bottom 4, and an elastic pad is arranged on the bracket for fitting the outer diameter of the pile legs 12 of various diameters.

[0047] The middle longitudinal wall 8 is determined according to the size of the pile legs 12, not the transverse center position of the hull; the method for determining the transverse position of the middle longitudinal wall 8 is to deduct the space required for the maximum design pile legs 12 size, and take the web height requirement of the girder not less than the layer height span from the main deck 2 to the inner bottom 4 as the design principle, but in order to reasonably control the ship width, the span of the middle longitudinal wall 8 does not need to be too large; the structural specifications of the longitudinal reinforcing girder below the main deck 2 are determined according to the span from the middle longitudinal wall 8 below the main deck 2 to the starboard side outer plate 10; the positioning position of the longitudinal girder is determined according to the position of the L-shaped positioning pin of the fan blade 13 shelf, and the longitudinal reinforcing girders below the main deck 2 other than this are distributed according to the equidistant rib spacing; the height h of the inner bottom 4 is determined according to the loading condition.

[0048] The width of the flared structure is determined according to the effective width in contact with the blades 13 , and in order to limit the ship width, the width of the flared structure is determined so as not to affect the reliability of the transmission of the blades 13 .

[0049] The height position of the local platform 3 can meet the size of the generator after deducting the height of the girder web, and is used to configure the generator; the height of the girder web on the other side where the local platform 3 is connected to the inner wall 7 meets the requirement of the local structural strength for the girder web height without interfering with the maximum design value of the pile leg 12 diameter.

[0050] On one side of the inner wall I are the ballast water tanks and the generator room and engine room separated by the platform, and on the other side of the inner wall I is the bulk cargo hold where the pile legs 12 are placed; the inner wall I is set to be discontinuous in the equipment compartment area to avoid participating in the total longitudinal bending; the equipment compartment area is set to be discontinuous specifically for strength discontinuity, that is, there is a discontinuous structure in the hull material. For cabins with watertight requirements, other watertight methods can be used to achieve it; the width B2 of the local cabin enclosed between the inner wall I and the side outer plate 5 is determined according to the size of the control motor of the pile holding system and the height of the web required for the cabin structure strength. The pressure on both sides of the inner wall I is unbalanced, causing the inner wall 7 to bear a large shear force, so the plate thickness of the inner wall 7 and the reinforcement specifications of the frame are determined according to the design loading calculation under typical shear conditions.

[0051] A typical structure meets the strength requirements of the existing specifications for cross-section design; the length of the pile leg 12 is L0 / m, the diameter of the pile leg 12 is D0 / m, and according to the loading requirements, the ballast water volume of the forepeak tank is V0 / m 3 , then the width B1 of the cargo hold area is B1≥3D0+0.8, the ship width B is B=B1+B2, and the ship length L is L≥L0+V0 / (B×h); the common cross beam is arranged every 4 rib spacings, each rib spacing is 0.6m, and the web height of the cross beam does not exceed 0.3m; the large bracket structure is arranged every 20 levels, and the large brackets are distributed in the cargo hold and are located at the four corners of the space enclosed by the pile legs 12 and the cargo hold wall, and the four corners are respectively located below the main deck 2 and above the inner bottom 4; the distance between the free edge of the large bracket located below the main deck 2 and the outer diameter of the pile legs 12 does not exceed 350mm.

[0052] The large bracket is provided with openings at the pipeline crossing position, and the bracket structure without openings is used for the position without pipeline crossing; a solid wood block is provided between the two longitudinals below the main deck 2 where the distance between the main deck 2 and the pile legs 12 is closest; the longitudinal dimension of the solid wood block is the distance between the beams, the transverse dimension is the distance between the longitudinals, and the height is the height of the longitudinals.

[0053] A slot is provided in the middle of the two large bracket structures above the inner bottom 4, and the slot width is smaller than the diameter of the pile leg 12 to be transported; the height between the working deck 1 and the main deck 2 is determined according to the height of the lowest layer of blades 13 on the blade bracket 15 from the main deck 2 and the number of layers of the blades 13; the blades 13 do not exceed 3 layers; the height between the working deck 1 and the main deck 2 is not less than 2 / 3 of the height of the center axis of the lowest layer of blades 13 from the main deck 2; the bulkhead on the side of the large opening of the working deck 1 is aligned with the middle longitudinal wall 8; the inner wall II of the working deck 1 opposite to it is determined according to the position of the middle longitudinal wall 8 and the width of the blade bracket 15; the width of the installed blade 13 is 5 meters, and the width of the outer floating structure is 3.9 meters; the blade 13 is placed obliquely on the bracket, the width of the blade bracket 15 is 11.2 meters, and the width of the large opening is 12 meters; the space enclosed between the middle longitudinal wall 8 and the side of the working deck 1 is supported by pillars, the pillars are set every 20 steps, and the pillars are aligned with the inner wall I.

[0054] In addition, the present invention also includes a pile holding system;

[0055] The pile holding system is controlled by the engine to realize the rotation of the pile holding system; the engine is arranged on the inner bottom 4, and the generator is arranged on the main deck 2; a base is arranged under the engine; the base panel is in the same plane, and the end is not enlarged, so as to reduce the ship width; the base is welded along the inner wall I, the inner bottom 4 and the side; the base panel is beveled at the contact position with the side outer plate 5 and the contact position with the inner wall I; the diameter of the pile leg 12 that can be loaded is D0≤10m, and the length of the pile leg 12 is L0≤100m.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for designing a wind power equipment installation and transport ship structure, characterized in that: From top to bottom, they are respectively an operating deck (1), a main deck (2), a local platform (3), an inner bottom (4), and an outer plate (5). A continuous middle longitudinal wall (8) and an inner wall (7) are arranged between the operating deck (1) and the outer plate (5). The middle longitudinal wall (8) is determined according to the size of the pile legs and is not located at the center of the hull. The main deck (2), the inner bottom (4), the outer plate (5) and the middle longitudinal wall (8) are continuous structures that bear the total longitudinal strength. The operating deck (1), the local platform (3) and the inner wall (7) are local structures that do not bear the total longitudinal strength. The cabin enclosed between the main deck and the inner bottom is a cargo hold. The cargo hold is a full-through structure from the bow to the stern of the hull. The transverse direction of the ship is a hull structure with discontinuous structural strength. The discontinuous strength includes no transverse bulkhead, no pillars, and no typical strong frame structure. The typical strong frame structure is a hull reinforcement structure with continuous structural strength.

2. A method for designing a wind power equipment installation and transport ship structure according to claim 1, characterized in that: According to the structural design method, a typical cross-sectional structure of a wind power equipment installation and transportation ship is obtained. From the port side to the starboard side, the main component plates are respectively the port side outer plate (6), the inner wall (7), the middle longitudinal wall (8), the lower wall of the working deck (9), and the starboard side outer plate (10); and there is also a side flared structure (11). The method for determining the transverse position of the middle longitudinal wall (8) is to deduct the space required for the maximum design pile leg size and take the web height requirement of the girder not less than the layer height span from the main deck to the inner bottom as the design principle. The width of the flared structure is determined according to the effective width of the contact blade, and in order to limit the ship width, the width of the flared structure is based on not affecting the reliability of blade transmission. From the port side to the starboard side, the secondary component plates are divided into a large bracket support structure, a common beam structure, and a rib structure between the inner bottom. The large bracket support structure is located under the main deck and has an arc-shaped free edge.

3. A typical cross-sectional structural design method for a wind power equipment installation and transportation ship according to claim 2, wherein the working deck (1) is located on one side of the hull and has a large opening, the large opening (1) is used to store blade brackets (15), the cabin space enclosed between the working deck and the main deck is supported by pillars, the pillars are arranged every 20 steps, and the pillars are aligned with the inner wall (7), the height between the working deck and the main deck is determined according to the height of the lowest layer of blades on the blade bracket from the main deck and the number of layers of blades, and is not less than 2 / 3 of the height of the center axis of the lowest layer of blades from the main deck, and the blades do not exceed 3 layers, the main deck is provided with a latch above one side of the opening, the latch is an L-shaped latch (14), and the L-shaped latch is used to fix the blade bracket (15); the longitudinal reinforcing girder structure under the main deck is determined according to the span from the middle longitudinal wall under the main deck to the adjacent farthest bulkhead, the positioning position of the longitudinal girder is determined according to the position of the L-shaped latch (14), and the longitudinal reinforcing girders under the main deck other than the above are distributed according to the equidistant rib spacing.

4. According to a typical cross-sectional structural design method for a wind power equipment installation and transportation ship as described in claim 2, a large bracket for positioning the pile legs (12) is arranged on the inner bottom (4), the inner bottom height h is determined according to the loading condition, and an elastic pad is arranged on the large bracket for fitting the outer diameters of the pile legs (12) of various diameters, the pile leg diameter D0≤10m, the pile leg length L0≤100m, and the distance between the free edge of the large bracket and the outer diameter of the pile leg (12) does not exceed 350mm; the width of the installed blade (13) is 5 meters, and the width of the outer floating structure is 3.9 meters; the blade (13) is placed obliquely on the bracket, the width of the blade bracket (15) is 11.2 meters, and the width of the large opening is 12 meters.

5. The structural design method of a wind power equipment installation and transportation ship according to claim 1, characterized in that: By using the large bracket support structure, the ship length, ship width, molded depth and other hull type values ​​are reduced to ensure the transverse strength of the hull without transverse bulkheads, pillars and typical strong frame structures.

6. A method for designing a wind power equipment installation and transportation ship structure according to claim 1, characterized in that: The length of the pile leg (12) is L0 / m, the diameter of the pile leg (12) is D0 / m, and the volume of the ballast water in the forepeak tank is V0 / m 3 , then the width of the cargo hold area B1 is B1≥3D0+0.8, the ship width B is B=B1+B2, and the ship length L is L≥L0+V0 / (B×h).

7. A method for designing a wind power equipment installation and transportation ship structure according to claim 4, characterized in that: Ordinary cross beams are set every 4 ribs, each rib distance is 0.6m, and the web height of the cross beam does not exceed 0.3m; The large bracket structure comprises the large bracket support structure and the large bracket. The large bracket structure is arranged every 20 levels. The large bracket structure is distributed in the cargo hold and is located at the four corners of the space enclosed by the pile legs (12) and the cargo hold surrounding wall. The four corners are respectively located below the main deck (2) and above the inner bottom (4).

8. A method for designing a wind power equipment installation and transportation ship structure according to claim 1, characterized in that: The inner wall (7) is set to be discontinuous in the equipment compartment area. The discontinuity specifically refers to strength discontinuity, that is, the hull material has an intermittent structure. For cabins with watertight requirements, other watertight methods can be used to achieve it. One side of the inner wall (7) is a ballast water tank and a generator compartment and an engine compartment separated by a platform. The other side of the inner wall (7) is a cargo hold where pile legs are placed. The pressure on both sides of the inner wall (7) is unbalanced, resulting in the inner wall being subjected to a large shear force. The thickness of the inner wall plate and the reinforcement specifications of the frame material are determined according to the design loading calculation of typical shear conditions. The width B2 of the local cabin enclosed between the inner wall and the side outer plate is determined according to the size of the control motor of the pile holding system and the web height required for the cabin structure strength. The pile holding system is arranged in the inner wall. The pile holding system is controlled by an engine in a closed space surrounded by an inner wall (7) and a local platform (3) and a main hull, so that the pile holding system can be rotated. The height of the web of the girder on the other side where the local platform (3) is connected to the inner wall (7) meets the requirement of the local strength for the web of the girder without interfering with the pile leg diameter of the maximum design value. The engine is arranged on the inner bottom (4), and a base is arranged below the engine. The base panel is in the same plane and the end is not enlarged, so as to control the ship width. The base is welded along the inner wall (7), the inner bottom (4) and the side. The base is beveled at the panel at the contact position of the side outer plate and the contact position with the inner wall (7). The generator is arranged on the main deck (2).

9. A method for designing a wind power equipment installation and transportation ship structure according to claim 6, characterized in that: The large bracket is provided with an opening at the pipeline crossing position, and the bracket structure is without an opening for the position without pipeline crossing; a solid wood block is provided between two longitudinal bones below the main deck (2) where the distance between the main deck (2) and the pile leg (12) is closest; the longitudinal dimension of the solid wood block is the distance between the crossbeams, the transverse dimension is the distance between the longitudinal bones, and the height is the height of the longitudinal bones; a slot is provided in the middle of the two large bracket structures above the inner bottom (4), and the width of the slot is smaller than the diameter of the pile leg (12) to be transported.

10. A method for designing a wind power equipment installation and transportation ship structure according to claim 7, characterized in that: The number of blades (13) is not more than 3 layers; the height between the working deck (1) and the main deck (2) is not less than 2 / 3 of the height of the center axis of the lowest layer of blades (13) from the main deck (2); the bulkhead on the side of the large opening of the working deck (1) is aligned with the middle longitudinal wall (8); the space enclosed between the middle longitudinal wall (8) and the side of the ship below the working deck (1) is supported by pillars, the pillars are arranged every 20 steps, and the pillars are aligned with the inner wall I.

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