Wind power installation vessel and square truss pile leg, and pile leg design method of wind power installation vessel

Abstract

The present invention provides a wind power installation ship and a square truss pile leg, and a pile leg design method for the wind power installation ship. The pile leg design method for the wind power installation ship includes the following steps: according to the triangular truss pile legs with the same performance, the side length range of the square truss pile legs is controlled; the square truss pile legs are configured, the square truss pile legs include four main chords and four groups of support rods connecting two adjacent main chords, the planes where any two adjacent groups of support rods are located are perpendicular to each other, the main chord includes a rack plate, semicircular tubes arranged on opposite sides of the rack plate, and the gear lifting system is engaged with the rack plate; according to the loading requirements of the wind power installation ship, the deck area, the layout position and layout form of the square truss pile legs are determined, the vertical projections of all the support rods of the square truss pile legs are inclined relative to the length direction of the deck, and any two adjacent square truss pile legs are arranged in mirror symmetry; the load demand data of the wind power installation ship is analyzed and calculated to obtain the size of the square truss pile leg components.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engineering, and in particular to a wind power installation ship and a square truss pile leg, and a pile leg design method of the wind power installation ship. Background Art

[0002] At present, most of the newly built wind power installation ships in China adopt the design of triangular truss pile legs combined with pile cranes. Compared with the old cylindrical pile-leg wind power installation ships, the newly built wind power installation ships have greatly improved in terms of applicable water depth, loading capacity, lifting capacity, and storm resistance. They can not only transport 3 to 4 sets of wind turbines, but also adapt to operations at a water depth of 60 to 70 meters and lift 8 to 18MW wind turbines. In the future, wind farms will be farther offshore and deeper in water, and the size of wind turbines will continue to increase.

[0003] The future development of wind power will require the support of stronger wind power installation vessels, including larger loading capacity, stronger lifting capacity and storm resistance. All the increased weight and increased environmental loads will act on the pile legs supporting the platform, so truss pile legs with stronger load-bearing capacity are needed.

[0004] The method to improve the load-bearing capacity of truss pile legs is usually to increase the size of the pile legs. However, the deck area occupied by the increased-size pile legs is also increased, which reduces the space for loading cargo. In addition, the large-size pile legs also increase the design difficulty of the pile-encircling crane and the manufacturing difficulty of the swivel bearing. Summary of the invention

[0005] The object of the present invention is to provide a pile leg design method for a wind power installation vessel with a high design strength and without increasing the pile legs occupied by the deck area, and to solve the problems in the prior art by using the square truss pile legs and the wind power installation vessel designed by the above design method.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a pile leg design method for a wind power installation vessel, characterized in that it comprises the following steps:

[0007] According to triangular truss legs with the same performance, the side length range of the square truss legs is controlled so that the side length of the square truss legs is less than or equal to 82% of the side length of the triangular truss legs, and the deck area occupied by the square truss legs is less than or equal to the deck area occupied by the triangular truss legs with the same performance;

[0008] The square truss legs are configured, and the square truss legs include four main chords and four groups of support rods connecting two adjacent main chords, and the planes where any two adjacent groups of support rods are located are perpendicular to each other, and the main chord includes a rack plate and semicircular tubes arranged on opposite sides of the rack plate, and a gear lifting system is engaged with the rack plate;

[0009] According to the loading requirements of the wind power installation ship, the deck area, the layout position and layout form of the square truss legs are determined, wherein the planes where all the support rods of the square truss legs are located are inclined relative to the length direction of the deck, and any two adjacent square truss legs are arranged in mirror symmetry;

[0010] The load demand data of the wind power installation vessel is analyzed and calculated to obtain the size of the square truss legs; wherein the size of the square truss legs includes the thickness of the rack plate, the size of the semicircular tube, the diameter of the diagonal brace connected between two adjacent main chords, and the diameter of the inner support arranged between the diagonal braces.

[0011] In one embodiment, the angle between the vertical projection of two groups of the support rods of the square truss legs and the length direction of the deck is 30-45°, and the angle between the vertical projection of the other two groups of the support rods and the length direction of the deck is 45-60°.

[0012] In one embodiment, a line connecting the centers of two adjacent legs is parallel to the length direction or the width direction of the deck.

[0013] In one embodiment, the thickness of the rack plate is less than the thickness of the rack plate of a triangular truss leg with equivalent performance; and / or,

[0014] The size of the semicircular tube is smaller than that of the semicircular tube of a triangular truss pile leg with the same performance.

[0015] The present invention also provides a square truss pile leg designed by using the pile leg design method as described above.

[0016] In one embodiment, the side length of the square truss leg is 7m to 12m;

[0017] The thickness of the rack plate is 177.8 mm to 210 mm.

[0018] In one embodiment, the thickness of the semicircular tube is 60 to 90 mm;

[0019] The diameter of the semicircular tube is 520-860 mm.

[0020] In one embodiment, the diagonal brace is a pipe with a diameter of 273 mm to 500 mm;

[0021] The inner support adopts a pipe with a diameter of 152mm to 250mm.

[0022] The present invention further provides a wind power installation vessel, comprising a hull and square truss pile legs which are liftable and arranged on the hull, wherein the square truss pile legs are designed by using the pile leg design method as described above.

[0023] In one embodiment, the number of the square truss legs is four, and they are arranged at the four corners of the hull, and any two adjacent square truss legs are arranged in mirror symmetry;

[0024] The square truss legs include four main chords and four groups of support rods connecting two adjacent main chords. The planes where any two adjacent groups of support rods are located are perpendicular to each other. The vertical projections of all the support rods of the square truss legs are inclined relative to the length direction of the hull.

[0025] In one embodiment, the angle between the vertical projection of two groups of the support rods and the length direction of the deck is 30-45°, and the angle between the vertical projection of the other two groups of the support rods and the length direction of the deck is 45-60°.

[0026] In one embodiment, a line connecting the centers of two adjacent legs is parallel to the length direction or the width direction of the deck.

[0027] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0028] The pile leg design method of the present invention first controls the side length of the square truss pile legs, then configures the square truss pile legs, and then designs the arrangement of the square truss pile legs on the hull. Finally, calculation and analysis are performed based on various requirements to obtain the size of the square truss pile leg components.

[0029] By adopting the above-mentioned pile leg design method, it is possible to design a square truss pile leg with a small thickness rack plate and high strength without increasing the deck area occupied by the pile leg, so that it has high compressive and bending resistance, and can meet the future wind power installation ship's continued growth in design water depth, loading capacity, lifting capacity, and storm resistance. The demand for pile legs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of the pile leg design method of the wind power installation vessel in the present invention.

[0031] Figure 2 It is a top view of the square truss pile leg in the present invention.

[0032] Figure 3 It is a top view of the main chord of the square truss pile leg in the present invention.

[0033] Figure 4 It is a wind turbine installation vessel with triangular truss pile legs.

[0034] Figure 5 It is the wind power installation vessel in the present invention.

[0035] The following are the descriptions of the reference numerals:

[0036] 1. Wind power installation vessel; 11. Hull; 12. Square truss pile legs; 13. Triangular truss pile legs;

[0037] 121. Main chord; 1211. Rack plate; 1212. Semicircular tube; 122. Diagonal brace; 123. Inner support. DETAILED DESCRIPTION

[0038] Although the present invention can be easily embodied in different forms of embodiments, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principles of the invention and is not intended to limit the invention to that described herein.

[0039] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0040] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the present invention are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indications of these directions also change accordingly.

[0041] It should be noted that in view of the continuous improvement of the requirements for applicable water depth, loading capacity, lifting capacity, storm resistance and other aspects of large wind power installation ships, the previous design method is to achieve the improvement of the pile leg bearing capacity by continuously increasing the overall size of the traditional triangular truss pile legs and the size of the components that make up the pile legs. The overall size of the pile legs has increased from 8m to 12.6m, the thickness of the pile leg rack plate has increased from 177.8mm to 250mm, the thickness of the pile leg semicircular tube has increased from 60mm to 90mm, the diameter of the diagonal brace has increased from 273mm to 406mm, and the diameter of the inner support has increased from 152mm to 219mm. These increases in size have brought some adverse consequences: the pile legs have increased their footprint, reducing the space for loading cargo; the continuously increasing component size not only greatly increases the cost, but also brings difficulties to welding, and the welding quality is difficult to ensure.

[0042] The maximum thickness of rack plates currently available in China is 178mm, while the maximum thickness of rack plates available internationally is 250mm. That is, the thickness of 250mm rack plates has reached the upper limit of the current steel plate production level. The development of thicker rack plates will bring greater challenges to production, cost and quality.

[0043] Therefore, the inventor of the present application creatively provides a design method, a pile leg design method for a wind power installation vessel, designs a pile leg with high strength without increasing the occupied deck area, designs a compact, high-strength truss pile leg, reduces the size of the rotating bearing of the supporting pile crane, reduces the deck area occupied by the pile leg, and leaves more space for loading deck cargo, thereby meeting the future wind power installation vessel's greater loading capacity, stronger lifting capacity, storm resistance and frequent lifting functional requirements, and provides better pile legs for the large-scale wind power installation vessels.

[0044] The invention provides a pile leg design method for a wind power installation ship, which is used for designing a pile leg with high strength and without increasing the occupied deck area.

[0045] Figure 1 A schematic diagram showing a process flow of a pile leg design method for a wind turbine installation vessel is shown in FIG. Figure 1 , the pile leg design method of the wind power installation vessel includes the following steps:

[0046] S1. Based on the triangular truss legs with the same performance, the side length range of the square truss legs is controlled so that the side length of the square truss legs is less than 82% of the side length of the triangular truss legs, and the deck area occupied by the square truss legs is less than the deck area occupied by the triangular truss legs with the same performance.

[0047] Specifically, the performance here refers to the strength of the pile legs. Equal performance means that the strength of the triangular truss pile legs and the square truss pile legs are the same.

[0048] The side length of the square truss legs is designed to be smaller than 82% of the side length of the triangular truss legs, so that the deck area occupied by the square truss legs is smaller than the deck area occupied by the triangular truss legs of the same performance.

[0049] That is, the pile leg design method of the present invention first ensures that the size of the entire pile leg is small, without increasing the occupied deck area.

[0050] S2. Configure square truss legs; the square truss legs include four main chords and four groups of support rods connecting two adjacent main chords, and the planes where any two adjacent groups of support rods are located are perpendicular to each other. The main chord includes a rack plate and semicircular tubes arranged on opposite sides of the rack plate, and the gear lifting system is engaged with the rack plate.

[0051] The main chord rod extends vertically, and the support rod extends in a plane defined by two adjacent main chord tubes and is connected between the two adjacent main chord rods.

[0052] The planes where any two adjacent groups of support rods are located are perpendicular to each other, that is, the cross section of the square truss leg is square. The distance between the centers of two adjacent main chord rods in the square truss leg is defined as the side length.

[0053] Figure 2 shows a top view of the square truss legs, see Figure 2 The square truss leg 12 includes a diagonal brace 122 connecting two adjacent main chords 121 and an inner support 123 connecting two adjacent diagonal braces 122. The diagonal brace and the inner support located in the plane of the two adjacent main chords form a group of support rods. The diagonal brace 122 is inclined relative to the horizontal plane. The diagonal brace 122 located between the same two main chords 121 overlaps in vertical projection.

[0054] Since the side length of the square truss leg 12 is shorter than the side length of the triangular truss leg 13, the distance between any two adjacent main chords 121 is also reduced, so the length of the diagonal brace 122 connected between the two main chords 121 is naturally shorter than the length of the diagonal brace 122 of the triangular truss leg 13 with the same performance. Here, the inclination angle of the diagonal brace 122 is consistent with the angle of the diagonal brace 122 of the triangular truss leg 13 with the same performance.

[0055] The square truss leg 12 includes an inner support 123 connecting two adjacent diagonal supports 122. The inner support 123 extends in the horizontal direction, and the vertical projection of the inner support 123 is inclined relative to the vertical projection of the diagonal support 122.

[0056] Specifically, since the square truss leg 12 is square, the number of diagonal braces 122 located in the same horizontal plane is one more than the diagonal brace 122 of the triangular truss leg 13 with the same performance. The number of inner supports 123 located in the same plane is four, which is also one more than the inner supports 123 of the triangular truss leg 13 with the same performance. The four inner supports 123 located in the same plane are not directly connected to each other.

[0057] The length of the inner support 123 is shorter than the length of the inner support 123 of the triangular truss leg 13 of the same performance. Since the side length of the square truss leg 12 is shorter than the side length of the triangular truss leg 13, the length of the diagonal support 122 is shorter than the length of the diagonal support 122 of the triangular truss leg 13 of the same performance, therefore, the length of the inner support 123 is also necessarily shorter than the length of the diagonal support 122 of the triangular truss leg 13 of the same performance.

[0058] Figure 3 A top view of the main chord 121 of the square truss leg 12 is shown. Figure 3The main chord 121 includes a rack plate 1211 and semicircular tubes 1212 arranged on opposite sides of the rack plate 1211 .

[0059] After the square truss pile leg 12 is adopted, the number of main chord rods 121 is four, so the gear lifting system of the entire pile leg also has four groups. Compared with the triangular truss pile leg 13 of the same strength, the number of gear lifting units on each main chord rod 121 of the square truss pile leg 12 can be reduced by 25%. Due to the reduction in the number of gear lifting units, the number of meshing between the rack plate 1211 and the gear lifting system is reduced throughout the life cycle, thereby reducing the wear of the rack plate 1211 and improving the fatigue life.

[0060] S3. Determine the deck area, the layout position and the layout form of the square truss legs 12 according to the loading requirements of the wind power installation vessel 1, wherein the vertical projections of all the support rods of the square truss legs 12 are inclined relative to the length direction of the deck, and any two adjacent square truss legs 12 are arranged in mirror symmetry.

[0061] There are four square truss legs 12, which are arranged at four corners of the deck. The four legs are arranged in a mirror-symmetrical manner between any two adjacent legs, so that the force uniformity of the four legs is ensured.

[0062] The vertical projections of all the support rods of the square truss legs 12 are inclined relative to the length direction of the deck, which specifically means that the support rods are neither parallel nor perpendicular to the length direction, that is, each support rod extends neither along the length direction of the deck nor along the width direction of the deck.

[0063] Preferably, the angle between the vertical projection of two groups of support rods of the square truss legs 12 and the length direction of the deck is 30-45°, and the angle between the vertical projection of the other two groups of support rods and the length direction of the deck is 45-60°.

[0064] The line connecting the centers of two adjacent square truss legs 12 is parallel to the length direction or width direction of the deck. That is, the four square truss legs 12 enclose a rectangular structure.

[0065] In this embodiment, the angle between the vertical projection of each support rod and the length direction of the deck is 45°. The connecting line of the two main chords 121 of each square truss leg 12 arranged diagonally is parallel to the length direction or width direction of the deck. Two adjacent square truss legs 12 are arranged corner to corner.

[0066] S4. Analyze and calculate the load demand data of the wind power installation vessel 1 to obtain the size of the square truss leg 12. The size of the square truss leg 12 includes the thickness of the rack plate 1211, the size of the semicircular tube 1212, the length of the diagonal brace 122 connected between two adjacent main chords 121, and the length of the inner support 123 arranged between the diagonal braces 122.

[0067] Specifically, finite element analysis software is used to perform analysis and calculation to obtain specific dimensions.

[0068] The pile legs designed by the above design method meet the following conditions:

[0069] The thickness of the rack plate 1211 is smaller than the thickness of the rack plate 1211 of the triangular truss leg 13 with the same performance.

[0070] The size of the semicircular tube 1212 is smaller than that of the semicircular tube 1212 of the triangular truss leg 13 of the same performance.

[0071] The length of the diagonal brace 122 is shorter than the length of the diagonal brace 122 of the triangular truss leg 13 with the same performance.

[0072] The length of the inner support 123 is shorter than the length of the inner support 123 of the triangular truss leg 13 of the same performance.

[0073] By adopting the above-mentioned pile leg design method, it is possible to design a square truss pile leg 12 with a small thickness rack plate 1211 and high strength without increasing the deck area occupied by the pile leg, so that it has high compressive and bending resistance, and can meet the future wind power installation ship 1 The requirements for pile legs for the continued growth of design water depth, loading capacity, lifting capacity, and storm resistance.

[0074] By way of example, a super-large wind power installation vessel 1 with a maximum operating water depth of 70 meters is used to introduce the design method of the square truss pile legs, and a comparison is made between the square truss pile legs and the traditional triangular truss pile legs.

[0075] Among them, the wind power installation vessel 1 is 146m long, 55m wide, 11.5m deep, 125m long, 25,000t empty ship lifting weight, 12,000t maximum variable load, 2,200t lifting capacity, 15,000t single pile leg bearing capacity, 11.5m diameter of the circumscribed circle of the single pile leg, and 210mm thickness of the rack plate 1211.

[0076] The working parameters prepared for the operation are as follows: maximum water depth 70m, mud penetration 10m, air gap 11m, wind speed 36m / s, maximum wave height 8.37m, wave period 8.55s, and flow velocity 1.03m / s.

[0077] The operating parameters for the lifting operation are as follows: maximum water depth 70m, mud penetration 10m, air gap 11m, wind speed 13.8m / s, maximum wave height 7.44m, wave period 9s, and flow velocity 1.03m / s.

[0078] Figure 4 A wind turbine installation vessel 1 using triangular truss legs 13 is shown. Figure 4 There are four triangular truss legs 13, which are arranged at the four corners of the hull 11. The side length of the triangular truss legs 13 is 10m, the thickness of the rack plate 1211 is 210mm, the diameter of the diagonal brace 122 is 298mm, and the diameter of the horizontal brace is 168mm. At present, China can only supply rack plates 1211 with a thickness of 178mm or less in batches, and it is impossible to complete the localization of the legs of the above-mentioned large wind power installation ship 1.

[0079] According to the pile leg design method in the present invention, combined with engineering experience, the square truss pile leg 12 is designed.

[0080] First, the side length of the square truss leg 12 is determined to be 8 m, which is 80% of the side length of the triangular truss leg 13 of the same performance.

[0081] Next, the square truss leg 12 is configured. The square truss leg includes four main chords 121 and a support rod connecting two adjacent main chords 121, and the cross section of the square truss leg 12 is square. The main chord 121 includes a rack plate 1211, semicircular tubes 1212 arranged on opposite sides of the rack plate 1211, and a gear lifting system meshing with the rack plate 1211.

[0082] Secondly, according to the above-mentioned loading requirements for the wind power installation vessel 1, the deck area, the arrangement position and arrangement form of the square truss pile legs 12 are determined.

[0083] Figure 5 A wind turbine installation vessel 1 using square truss legs 12 is shown. Figure 5 Four square truss legs 12 are distributed at four corners of the wind turbine installation vessel 1. The angle between each support rod of each square truss leg 12 and the length direction of the deck is 45 degrees, and the corner points of two square truss legs 12 on the same side are opposite to each other.

[0084] Then, the dimensions of the square truss pile legs 12 are obtained by performing analysis and calculation using finite element software.

[0085] Through calculation, it is found that the thickness of the rack plate 1211 is 178 mm, the diameter of the diagonal brace 122 is 273 mm, and the length of the diagonal brace 122 is less than the length of the diagonal brace 122 of the triangular truss leg 13 with the same performance.

[0086] The diameter of the inner support 123 is 152 mm, and the length of the inner support 123 is less than the length of the inner support 123 of the triangular truss leg 13 with the same performance.

[0087] The square truss leg 12 designed by the leg design method of the present invention is compared with the triangular truss leg 13 of the same performance: the side length of the square truss leg 12 is 80% of the side length of the triangular truss leg 13, so that the diameters of the circumscribed circles of the two are close, that is, the occupied deck areas are close. The cross-sectional area of ​​the square truss leg 12 is larger than the cross-sectional area of ​​the triangular truss leg 13, so the square truss leg 12 has a greater compressive capacity. The section modulus of the square truss leg 12 is larger, so the square truss leg 12 has better bending resistance.

[0088] The thickness of the rack plate 1211 of the square truss leg 12 is 178 mm, and the thickness of the rack plate 1211 of the triangular truss leg 13 is 210 mm. However, at present, the maximum thickness of the rack plate 1211 that can be realized in China is 178 mm, and the rack plate 1211 with a thickness of 210 mm needs to be imported. The market price of the imported 210 mm rack plate 1211 is about 67% higher than that of the domestic 178 mm rack plate 1211. Considering the usage and construction process, the comprehensive cost of the square truss leg 12 is nearly 30 million yuan lower than that of the triangular truss leg 13.

[0089] The number of gear boxes on each main chord 121 of the square truss leg 12 can be 75% of the number of gear lifting systems on each main chord 121 of the triangular truss leg 13, that is, if each main chord 121 of the triangular truss leg 13 is equipped with 8 layers of gear boxes, then the corresponding equivalent square truss leg 12 is equipped with 6 layers of gear boxes on each main chord 121 to meet the lifting requirements, that is, the number of times each tooth of the rack of the lifting section of the square truss leg 12 is compressed is 75% of that of the triangular leg under the same lifting height. The thickness of the rack plate 1211 of the square truss leg 12 is 85% of that of the triangular truss leg 13. In general, the rack pressure of the rack plate 1211 of the square truss leg 12 during lifting is 88% of that of the triangular truss leg 13, and the number of times it is compressed is only 75%. Therefore, under the functional requirements of frequent lifting, the fatigue performance and wear resistance of the rack of the square truss leg 12 are better.

[0090] The present invention also provides a square truss pile leg 12, which is designed using the above pile leg design method.

[0091] Specifically, the side length of the square truss leg 12 is 7m to 12m. The thickness of the rack plate 1211 is 177.8mm to 210mm.

[0092] The thickness of the semicircular tube 1212 is 60 to 90 mm. The diameter of the semicircular tube 1212 is 520 to 860 mm.

[0093] The diagonal brace 122 is made of a pipe with a diameter of 273 mm to 500 mm, and the inner brace 123 is made of a pipe with a diameter of 152 mm to 250 mm.

[0094] The present invention further provides a wind power installation vessel 1, comprising a hull 11 and a square truss pile leg 12 which is escalable and arranged on the hull 11. The square truss pile leg 12 is designed by using the above pile leg design method.

[0095] There are four square truss legs 12 , which are arranged at four corners of the hull 11 .

[0096] The square truss legs 12 include four main chords 121 and four groups of support rods connecting two adjacent main chords 121. The planes where any two adjacent groups of support rods are located are perpendicular to each other. The vertical projections of all support rods of the square truss legs 12 are inclined relative to the length direction of the hull 11, and any two adjacent square truss legs 12 are arranged in mirror symmetry.

[0097] The angle between the vertical projection of two groups of support rods and the length direction of the deck is 30 to 45 degrees, and the angle between the vertical projection of the other two groups of support rods and the length direction of the deck is 45 to 60 degrees.

[0098] The line connecting the centers of the circumscribed circles of two adjacent main chords 121 is parallel to the length direction or the width direction of the deck.

[0099] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of 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, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for designing pile legs of a wind power installation vessel, characterized in that: The following steps are involved: According to triangular truss legs with the same performance, the side length range of the square truss legs is controlled so that the side length of the square truss legs is less than 82% of the side length of the triangular truss legs, and the deck area occupied by the square truss legs is less than the deck area occupied by the triangular truss legs with the same performance; The square truss legs are configured, and the square truss legs include four main chords and four groups of support rods connecting two adjacent main chords, and the planes where any two adjacent groups of support rods are located are perpendicular to each other, and the main chord includes a rack plate and semicircular tubes arranged on opposite sides of the rack plate, and a gear lifting system is engaged with the rack plate; Determine the deck area, the layout position and layout form of the square truss legs according to the loading requirements of the wind turbine installation vessel, wherein the vertical projections of all the support rods of the square truss legs are inclined relative to the length direction of the deck, and any two adjacent square truss legs are arranged in mirror symmetry; The load demand data of the wind power installation vessel is analyzed and calculated to obtain the size of the square truss legs; wherein the size of the square truss legs includes the thickness of the rack plate, the size of the semicircular tube, the diameter of the diagonal brace connected between two adjacent main chords, and the diameter of the inner support arranged between the diagonal braces.

2. The method for designing pile legs of a wind power installation vessel according to claim 1, characterized in that: The angle between the vertical projections of two groups of the support rods of the square truss legs and the length direction of the deck is 30-45°, and the angle between the vertical projections of the other two groups of the support rods and the length direction of the deck is 45-60°.

3. The method for designing pile legs of a wind power installation vessel according to claim 2, characterized in that: A line connecting the centers of two adjacent pile legs is parallel to the length direction or the width direction of the deck.

4. The method for designing pile legs of a wind power installation vessel according to claim 1, characterized in that: The thickness of the rack plate is less than the thickness of the rack plate of a triangular truss leg with equivalent performance; and / or, The size of the semicircular tube is smaller than that of the semicircular tube of a triangular truss pile leg with the same performance.

5. A square truss leg, characterized in that: The pile leg is designed by using the pile leg design method as described in any one of claims 1 to 4.

6. The square truss leg according to claim 5, characterized in that: The side length of the square truss pile leg is 7m to 12m; The thickness of the rack plate is 177.8 mm to 210 mm.

7. The square truss leg according to claim 5, characterized in that: The thickness of the semicircular tube is 60 to 90 mm; The diameter of the semicircular tube is 520-860 mm.

8. The square truss leg according to claim 5, characterized in that: The diagonal brace adopts pipe fittings with a diameter of 273mm to 500mm; The inner support adopts a pipe with a diameter of 152mm to 250mm.

9. A wind power installation vessel, characterized in that: It comprises a hull and square truss legs which are liftable and arranged on the hull, wherein the square truss legs are designed by the leg design method according to any one of claims 1 to 4.

10. The wind power installation vessel according to claim 9, characterized in that: The number of the square truss legs is four, and they are arranged at the four corners of the hull, and any two adjacent square truss legs are arranged in mirror symmetry; The square truss legs include four main chords and four groups of support rods connecting two adjacent main chords. The planes where any two adjacent groups of support rods are located are perpendicular to each other. The vertical projections of all the support rods of the square truss legs are inclined relative to the length direction of the hull.

11. The wind power installation vessel according to claim 10, characterized in that: The angles between the vertical projections of two groups of the support rods and the length direction of the deck are 30 to 45 degrees, and the angles between the vertical projections of the other two groups of the support rods and the length direction of the deck are 45 to 60 degrees.

12. The wind power installation vessel according to claim 11, characterized in that: A line connecting the centers of two adjacent pile legs is parallel to the length direction or the width direction of the deck.

Images