Spiral rib-shaped ice-resistant structure suitable for offshore wind power single-pile foundation

Abstract

The utility model discloses a spiral rib type ice-resistant structure suitable for an offshore wind power single pile foundation, which comprises an ice-resistant rib, an upper hoop fixing device and a lower hoop fixing device, the upper hoop fixing device and the lower hoop fixing device are identical in structure and opposite in direction, and eight grooves are formed along the inner side of the end face and used for installing the rib; the lower hoop is firstly installed, the eight ice-resistant ribs are embedded, and then the upper hoop is installed and reinforced. The ice-resistant rib is in a spiral shape, the edge angle of the ice-resistant rib is mainly formed by welding two steel plates, the ice-resistant rib plays a main role in ice resistance, and embedded plates are additionally arranged at the two ends of the rib so that the ice-resistant rib can be conveniently installed in the hoop. The section of the ice-resistant rib is triangular, the section size is determined according to the diameter of a single-pile foundation, and the length of the rib and the reinforcing position are determined by the waterline position. According to the utility model, a spiral rib structure is adopted, so that the ice-induced vibration of the structure in the interaction process of sea ice and a vertical structure is avoided. The sectional dimension of the rib structure is smaller than that of an existing ice-resistant cone structure, the machining cost can be effectively reduced, and the rib structure has the advantages of being convenient to install and high in ice-resistant capacity.

Description

Technical Field

[0001] The utility model relates to a spiral ribbed ice-resistant structure, in particular to a spiral ribbed ice-resistant structure suitable for offshore wind power monopile foundation, belonging to the technical field of marine engineering. Background Art

[0002] With the advancement of energy crisis and polar resource development, marine engineering structures play a key role in the development of wind power and oil and gas in polar and cold seas. However, the frequent activities of sea ice, especially as an environmental load, pose a serious threat to structural safety, and past accidents have warned of its destructive power. Structural damage and ice-induced vibration events caused by sea ice may lead to serious engineering failures and economic losses. This threat is particularly significant in offshore wind power projects because they are far away from land and difficult to maintain. Once the foundation is damaged, the consequences are serious. Ice resistance is a core concern in the design of offshore wind power structures. The foundation of the wind turbine must be able to withstand ice loads while ensuring the stability and economy of the structure. The research focus is on developing structural solutions that adapt to the characteristics of the sea area, can effectively resist ice pressure and reduce ice-induced vibration. Such innovations are directly related to the survivability of wind farms and the sustainable development of the entire industry. Therefore, improving the ice resistance of structures is a crucial step in promoting the advancement of offshore wind power technology and economic feasibility.

[0003] In extremely cold waters, the sea ice that is widely formed on the sea surface in winter poses a significant load challenge to wind power structures. This sea ice load will cause structural vibration and accelerate the accumulation of fatigue damage, significantly shortening the service life of wind power structures. When sea ice comes into contact with vertical structures, it mainly causes extrusion damage, forming a continuous high-pressure area on the surface of the structure, which will not only generate huge ice loads, but also trigger strong ice-induced vibrations, posing a serious threat to the stable operation of wind power structures and personnel safety. At present, most ice-resistant designs draw on the design concept of offshore oil platforms and adopt a positive and inverted cone combination structure. Such structures often bear large wave loads, have high construction costs, or the structure itself is too complex and difficult to install, and there are many limiting factors. For wind power foundation structures in cold regions, the waterline scale is relatively wide, and it will be further increased with the addition of a conical structure. This will increase the wave load on the structure, induce stronger structural vibrations, and have an adverse effect on the fatigue life of the wind power structure.

[0004] Therefore, the utility model aims at the shortcomings of the traditional cone structure performance and designs a new type of spiral rib-type ice-resistant structure, which can effectively save costs while improving the ice load and wave load borne by the single pile foundation. Summary of the invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the utility model provides a spiral rib-type ice-resistant structure suitable for offshore wind power single pile foundation, which not only ensures the ice-resistant performance, but also improves the wave load on the structure and reduces the cost, so as to meet the needs of promoting the development of offshore wind power in cold regions.

[0006] The technical solution of the utility model is achieved in this way:

[0007] A spiral rib-type ice-resistant structure suitable for offshore wind power monopile foundation, comprising a monopile foundation, an upper hoop, a rib, and a lower hoop, characterized in that the lower hoop is composed of a pair of half hoops, bolts, and nuts, the half hoops are semicircular, and the two ends are bent outward to form mounting ears, and holes are opened on the mounting ears, and four grooves are evenly spaced along the inner side of the upper end surface for embedding the lower rib panel. The pair of half hoops are combined into a circular ring, and the bolts pass through the holes on the mounting ears, and the bolts are tightened by tightening the nuts; the upper hoop has the same structure as the lower hoop and is in opposite directions, that is, the half hoop has four evenly spaced grooves along the inner side of the lower end surface for embedding the upper rib panel; the rib is composed of an upper rib panel, an upper rib end steel plate, a rib bottom steel plate, a rib side steel plate I, a rib side steel plate II, and a lower rib end steel plate The ribs are spiral, and their corners are welded by rib side steel plates Ⅰ and rib side steel plates Ⅱ. The other sides of rib side steel plates Ⅰ and rib side steel plates Ⅱ are respectively welded to the rib bottom steel plates to form a spiral rib with a triangular cross-section. The upper rib end steel plate is welded at the upper end, and the upper rib insert is welded on the upper rib end steel plate, the lower rib end steel plate is welded at the lower end, and the lower rib insert is welded on the lower rib end steel plate; the spiral rib type ice-resistant structure is a hollow structure, which is mounted on a single pile foundation for use. After the lower hoop is mounted on the single pile foundation, it is fastened with bolts and nuts, and 8 anti-ice ribs are embedded in turn. Finally, the upper hoop is installed and fastened with bolts and nuts. 8 identical spiral ribs are evenly distributed along the circumferential direction on the surface of the single pile foundation.

[0008] It is also characterized in that the size of the triangular cross-section of the anti-ice rib is determined according to the diameter of the single pile foundation, and the length and reinforcement position of the rib are determined by the waterline position; the spiral rib-type anti-ice structure is installed on the circumferential surface of the single pile foundation to replace the cylindrical surface of the single pile foundation in contact with the sea ice.

[0009] Compared with the prior art, the advantages of the utility model are obvious, mainly manifested in:

[0010] 1. By installing the spiral ribbed anti-ice structure near the waterline of the single pile foundation, the interaction mechanism between sea ice and the structure is transformed from extrusion damage with the upright structure to bending damage with the ribbed structure, while avoiding the processing, installation and material consumption problems caused by the excessive diameter of the traditional anti-ice cone structure. This structure can effectively avoid the formation of local continuous ice pressure during the interaction between ice and the upright structure, thereby reducing the ice load and structural ice-induced vibration caused by its extrusion and crushing, and ensuring the safe operation of wind power structures and even offshore pile platforms. The anti-ice structure is easy to manufacture and simple to assemble, effectively saving production costs and labor costs;

[0011] 2. The technical solution itself is simple to implement and can be spliced ​​in steps. During installation, install the lower hoop, anti-ice ribs and upper hoop on the surface of the original single pile foundation from bottom to top along the vertical direction. After the two halves of the hoop are spliced, 8 anti-ice ribs are embedded in the groove in turn on the basis of the lower hoop, and finally the upper hoop is installed and reinforced. The rib structure can be assembled first and then transported to the required location. The design of the panels and grooves further reduces the difficulty of installation, and the implementation difficulty of the structure itself is relatively low. The size requirements of the anti-ice structure are reduced, and while ensuring the anti-ice performance, the wave load on the structure is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model has attached Figure 5 Of which:

[0013] Figure 1 This is a schematic diagram of the installation of the utility model;

[0014] Figure 2 This is a schematic diagram of the spiral ribbed ice-resistant structure after omitting the single pile foundation;

[0015] Figure 3 The schematic diagram of the placement of the ribs is shown below;

[0016] Figure 4 Schematic diagram of the rib structure;

[0017] Figure 5 It is a schematic diagram of the lower hoop of the utility model.

[0018] Among them, 1. single pile foundation, 2. upper hoop, 3. rib, 31. upper rib inlay, 32. upper rib end steel plate, 33. rib bottom steel plate, 34. rib side steel plate I, 35 rib side steel plate II, 36. lower rib end steel plate, 37. lower rib inlay, 4. lower hoop, 41. half hoop, 42. bolt, 43. nut. DETAILED DESCRIPTION

[0019] like Figure 1 , 2, 3, 4, and 5 show a spiral rib-type ice-resistant structure suitable for an offshore wind power monopile foundation, comprising a monopile foundation 1, an upper hoop 2, a rib 3, and a lower hoop 4, wherein the lower hoop 4 is composed of a pair of half hoops 41, bolts 42, and nuts 43, the half hoop 41 is semicircular, with both ends bent outward to form mounting ears, and holes are opened on the mounting ears, and four grooves are equidistantly opened along the inner side of the upper end face for embedding the lower rib panel 37, the pair of half hoops 41 form a circular ring, the bolts 42 pass through the holes on the mounting ears, and the bolts are tightened by tightening the nuts 43; the upper hoop 2 has the same structure as the lower hoop 4 and is in opposite directions, that is, the half hoop has four grooves equidistantly opened along the inner side of the lower end face for embedding the upper rib panel 31; the rib 3 is composed of an upper rib panel 31, an upper rib end steel plate 32, a rib bottom steel plate 33, a rib side steel plate I 34, a rib side steel plate II 35, The lower rib end steel plate 36 and the lower rib inlay plate 37 are composed of a spiral rib, and its corners are welded by rib side steel plates I34 and rib side steel plates II35. The other sides of the rib side steel plates I34 and II35 are respectively welded to the rib bottom steel plate 33 to form a spiral rib with a triangular cross-section. The upper rib end steel plate 32 is welded at the upper end, and the upper rib inlay plate 31 is welded on the upper rib end steel plate 32. The lower rib end steel plate 36 is welded at the lower end, and the lower rib inlay plate 37 is welded on the lower rib end steel plate 36. The spiral rib type ice-resistant structure is a hollow structure, which is mounted on the single pile foundation 1 for use. After the lower hoop 4 is mounted on the single pile foundation 1, it is fastened with bolts 42 and nuts 43, and 8 anti-ice ribs 3 are embedded in turn. Finally, the upper hoop 2 is installed and fastened by bolts and nuts. Eight identical spiral ribs are evenly distributed on the surface of the single pile foundation 1 along the circumferential direction.

[0020] It is also characterized in that the size of the triangular cross-section of the anti-ice rib is determined according to the diameter of the single pile foundation, and the length and reinforcement position of the rib are determined by the waterline position; the spiral rib-type anti-ice structure is installed on the circumferential surface of the single pile foundation 1 to replace the cylindrical surface of the single pile foundation 1 in contact with the sea ice.

[0021] The spiral ribbed anti-ice structure of this embodiment is installed at the waterline of the single pile foundation. The selection of ribs and hoop types includes the material, cross-sectional shape and size of the ribs and hoop. Angle steel materials with corrosion resistance should be selected, such as 316L stainless steel, which can be used for building materials and production equipment in seawater; the cross-sectional shape of the ribs is triangular; the size of the ribs needs to be set according to the average ice thickness in the specific application sea area. When the ice thickness is large, ribs with larger cross-sectional areas should be selected, and the length of the ribs should be determined according to the floating range of the waterline in the sea area. The cross-sectional shape of the hoop is a quasi-circular ring; its size is determined by the single pile foundation and the ribs. In this example, the pile leg diameter is 1m, and the average ice thickness in the sea area is about 0.2m. Therefore, the thickness of the rib steel plate is selected to be 10cm and the height of the ribs is 2m. The spiral line has a radius of 1m, a pitch of 4m, and a number of turns of 0.5; the triangle of its cross section is a circular arc with a diameter of 1m and two perpendicular line segments with a length of 24cm; the panel is tile-shaped, 20cm high, with an inner circular arc radius of 0.5m, an outer circular arc radius of 0.51m, and an inner circular arc angle of 18°. The semi-hoop is 0.3m high, with an inner diameter of 0.5m and an outer diameter of 0.53m. The installation ear is 13cm long and 3cm thick. There are 3 holes on the ear, 6.5cm from the edge, and the hole diameter is 2cm. The groove corresponds to the panel; the distribution of the ribs: As the flow direction of the seawater changes continuously, the direction of the action of ice and the structure also changes accordingly. Therefore, it is necessary to evenly distribute the ribs on the surface of the single pile foundation so that the ice can collide with the ribs in different flow directions to achieve the expected effect of reducing the ice load. At the same time, the distribution of the ribs should not be too dense, which will cause blockage and siltation of the broken ice, which cannot be cleared in time and freezes again, reducing the icebreaking performance of the anti-ice structure. In the utility model, a distribution method of one rib every 45 degrees is adopted, and a total of 8 ribs are arranged on the surface of the structure. The ribs are equidistantly distributed from each other, and their geometric centers are on the same circumferential surface of the single pile foundation, and together they form a spiral rib-type anti-ice structure that surrounds the single pile foundation. By installing the spiral rib-type anti-ice structure near the waterline of the single pile foundation, the action mechanism of sea ice and the structure is converted from extrusion damage with the upright structure to bending damage with the rib structure, while avoiding the processing, installation problems and material consumption problems caused by the excessive diameter of the traditional anti-ice cone structure. The structure can effectively avoid the formation of local continuous ice pressure during the action of ice and the upright structure, thereby reducing the ice load and structural ice-induced vibration caused by its extrusion and crushing, and ensuring the safe operation of the wind power structure and even the offshore pile platform. The anti-ice structure has the characteristics of convenient manufacturing and simple assembly, which effectively saves production costs and labor costs.

[0022] It should be noted that the above describes the embodiments of the present invention. However, those skilled in the art should understand that the present invention is not limited by the above embodiments, which are only used to illustrate the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the scope of the present invention, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A spiral ribbed ice-resistant structure suitable for an offshore wind power monopile foundation, comprising a monopile foundation (1), an upper hoop (2), ribs (3), and a lower hoop (4), characterized in that The lower hoop (4) is composed of a pair of half hoops (41), bolts (42), and nuts (43). The half hoop (41) is semicircular, with both ends bent outward to form mounting ears, and a hole is opened on the mounting ear. Four grooves are evenly spaced along the inner side of the upper end surface for embedding the lower rib panel (37). The pair of half hoops (41) are combined into a ring. The bolts (42) pass through the holes on the mounting ears and are tightened by tightening the nuts (43). The upper hoop (2 ) has the same structure as the lower hoop (4) and is opposite in direction, that is, the semi-hoop has four grooves equidistantly arranged along the inner side of the lower end surface for embedding the upper rib panel (31); the rib (3) is composed of an upper rib panel (31), an upper rib end steel plate (32), a rib bottom steel plate (33), a rib side steel plate I (34), a rib side steel plate II (35), a lower rib end steel plate (36), and a lower rib panel (37); the rib is spiral-shaped, and its corners are The invention is formed by welding a rib side steel plate I (34) and a rib side steel plate II (35), wherein the other sides of the rib side steel plate I (34) and the rib side steel plate II (35) are respectively welded to the rib bottom steel plate (33) to form a spiral rib with a triangular cross section, an upper rib end steel plate (32) is welded at the upper end, and an upper rib insert plate (31) is welded on the upper rib end steel plate (32), and a lower rib end steel plate (36) is welded at the lower end, and a lower rib end steel plate (36) is welded at the lower end. A lower rib inlay plate (37) is welded on the steel plate (36); the spiral rib type ice-resistant structure is a hollow structure, which is mounted on the monopile foundation (1) for use. After the lower hoop (4) is mounted on the monopile foundation (1), it is fastened with bolts (42) and nuts (43), and eight ice-resistant ribs (3) are embedded in sequence. Finally, the upper hoop (2) is installed and fastened with bolts and nuts. Eight identical spiral ribs are evenly distributed on the surface of the monopile foundation (1) along the circumferential direction.

2. The spiral ribbed ice-resistant structure suitable for offshore wind power monopile foundation according to claim 1 is also characterized by: The size of the triangular cross-section of the anti-ice rib is determined according to the diameter of the monopile foundation, and the length and reinforcement position of the rib is determined by the waterline position; the spiral rib-type anti-ice structure is installed on the circumferential surface of the monopile foundation (1) to replace the cylindrical surface of the monopile foundation (1) in contact with the sea ice.

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