Scouring protection umbrella-shaped combination device for gravity type foundation of ocean wind turbine and construction method of scouring protection umbrella-shaped combination device

Abstract

The invention discloses a scouring protection umbrella-shaped combination device for a gravity type foundation of an ocean wind turbine and a construction method of the scouring protection umbrella-shaped combination device. The scouring protection umbrella-shaped combined device comprises a flexible protection piece, a supporting keel, a balance weight anchor chain and a device reinforcement ring. Different from traditional passive scour bearing schemes such as ripraps and caissons, by means of the unique horn-shaped structural design, near-bed water flow paths around the bridge pier are actively changed and guided, the core of a horseshoe-shaped vortex can be effectively lifted away from the surface of a seabed, the horseshoe-shaped vortex is suspended, and therefore the downward scour capacity and the sediment suction and entrapment capacity of the horseshoe-shaped vortex are greatly weakened, and the service life of the horseshoe-shaped vortex is prolonged. The local scouring depth is fundamentally reduced, and the service life of the fan foundation is prolonged; formation conditions and stable structures of horseshoe-shaped vortexes and downflow are destroyed from the physical source, the effect that prevention is better than treatment is achieved, the counterweight anchor chain is arranged, formation of the vortexes is further disturbed, and the protection efficiency is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foreign object impact damage control of an aero-engine, and particularly relates to a scour protection umbrella-shaped combined device for a marine wind turbine gravity foundation and a construction method thereof. BACKGROUND

[0003] In deep water sea areas, due to the limitation of geological conditions and construction accessibility, gravity foundations are widely used in offshore wind power projects in the middle and deep water areas due to the advantages of no need for piling, stable structure system, small construction disturbance, and less impact on the ecological environment. In particular, in soft seabed or rock shallow buried areas, gravity foundations can provide the necessary stability through their own weight, avoiding high-cost pile foundation construction and anchoring measures; however, gravity foundation structures have a long-term and critical hidden danger of scour damage; and a large number of engineering examples show that gravity foundations without effective scour protection structures develop scour pits in the initial operation period, which seriously threatens the structural safety and operation life of the wind turbine.

[0004] To cope with the scour problem, various protection measures are commonly used in engineering, such as laying of block stones, precast concrete pavement, laying of geosynthetic materials, and annular caisson foot protection; these measures have been applied in shallow water engineering, but their promotion in deep water is limited due to the following problems: 1. The material is rigid and cannot adapt to complex seabed topography and flow field disturbance, which may instead induce local vortex enhancement and secondary scour; 2. The structure is large in volume and installation relies on heavy lifting and precise positioning, which requires a long construction period and high window period; 3. The transportation and installation costs are high, which is not conducive to large-scale and rapid construction, limiting their practical application in deep-sea wind farms; in addition, traditional protection measures generally lack flexibility and structural adaptation ability, and cannot be quickly designed and deployed according to different water depths, topography, flow velocity, wave energy and other parameters in different sea areas. In complex environments, problems such as insufficient protection range, scour at the edge of the protection structure, or structural failure often occur. Especially in the context of the promotion and application of new generation large gravity foundation structures (such as barrel type, skirt valve type, etc.), the existing scour protection technology has obvious deficiencies in adaptability, flexibility and economy. SUMMARY

[0005] To solve the above technical problems, the technical scheme adopted by the present application is: a scour protection umbrella-shaped combined device for a marine wind turbine gravity foundation, comprising a flexible protection sheet, a support keel, a counterweight anchor chain, and a device reinforcing ring;

[0006] A plurality of support keels are detachably fixed and installed on the outer side of the device reinforcing ring, and the support keels are evenly distributed radially on the outer side of the device reinforcing ring;

[0007] Each two adjacent support keels are detachably fixedly connected with a flexible protection sheet.

[0008] The counterweight anchor chain is fixedly connected to one end of the support keel away from the device reinforced ring;

[0009] During construction, the device reinforced ring is sleeved on the cylinder of the offshore wind turbine, and the device reinforced ring is in contact with the upper side of the gravity foundation of the offshore wind turbine.

[0010] As a preferred technical solution of the present application, the support keel is a downwardly recessed arc-shaped structure, and the surface thereof is subjected to an anti-corrosion process.

[0011] As a preferred technical solution of the present application, the flexible protective sheet is a flexible fan-shaped sheet made of an anti-corrosion high-strength fiber reinforced composite material.

[0012] As a preferred technical solution of the present application, the diameter of the support keel after being scanned is -times of the diameter of the bottom of the gravity foundation of the offshore wind turbine.

[0013] As a preferred technical solution of the present application, the counterweight anchor chain is a metal chain, and the surface thereof is subjected to an anti-corrosion process.

[0014] As a preferred technical solution of the present application, the inner diameter of the device reinforced ring is slightly larger than the outer diameter of the cylinder of the offshore wind turbine, and the surface thereof is subjected to an anti-corrosion process.

[0015] In addition, the present application also provides a construction method of the scour protection umbrella-shaped combined device for the gravity foundation of the offshore wind turbine, comprising the following steps: S1, measuring and calculating seabed data and adjusting parameters of the umbrella-shaped combined device: according to the seabed topography and water depth, the parameter design and component prefabrication of the umbrella-shaped combined device are performed;

[0016] S2, assembling: the module pre-assembly and test are completed at the port or the operation platform, the support keel is fixedly connected with the device reinforced ring, then a plurality of flexible protective sheets are installed between the support keels and form an integral whole with the support keels, the flexible protective sheets are deformed downwardly and recessed under the action of the support keels, after the installation of the flexible protective sheets is completed, the counterweight anchor chain is fixedly installed at one end of the support keel away from the device reinforced ring, and the assembly of the equipment is completed;

[0017] S3, installation and fixation: the assembled equipment is transported to the position of the wind turbine, then the device reinforced ring is sleeved into the cylinder of the wind turbine, and the counterweight anchor chain is fixed by the external rope control type grappling hook, after the fixation is completed, the equipment sinks along the cylinder of the wind turbine under the action of gravity until the lower side of the device reinforced ring is in contact with the gravity foundation of the offshore wind turbine, and the installation is completed.

[0018] S4, correction: according to the pull-out length of each rope control type grab, it is judged whether the device is in the inclined state, if there is inclination, the corresponding rope control type grab on the low side is pulled to right it, and then the rope control type grab is controlled to release the weight anchor chain, that is, the correction work is completed.

[0019] The beneficial effects of the present application are:

[0020] Firstly, the present application is different from the traditional riprap and caisson passive erosion scheme, the present application actively changes and guides the near-bed flow path around the pier through the unique horn-shaped structure design, can effectively lift the core of the horseshoe vortex away from the seabed surface, make it "suspended", thereby greatly weakening its ability to scour and suck down the sand, fundamentally reducing the local scour depth, prolonging the service life of the fan foundation; it destroys the formation conditions and stable structure of the horseshoe vortex and descending flow from the physical root, realizes the effect of "prevention is better than cure", and the present application further disturbs the formation of vortex by setting the counterweight anchor chain, so that the protection efficiency is higher.

[0021] Secondly, the present application has simple structure, each component can be disassembled, can be conveniently transported and installed, especially for the deep sea environment, the simple installation steps and the characteristics of disassembled transportation can greatly reduce the transportation and installation cost; and since the structure of the present application is simple, standardized process can be used for factory prefabrication, the quality is controllable, and fine adjustment can be made according to the size of the fan foundation and the data of the sea current and seabed near the fan foundation.

[0022] Thirdly, the present application can adapt to various severe hydrological environments such as seawater and freeze-thaw cycle by adjusting the material and surface treatment, and has wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in combination with the drawings and examples.

[0024] Fig. 1 is a perspective view of the present application.

[0025] Fig. 2 is a front view of the present application. Fig. 3 is a perspective view of the present application in the upward direction.

[0026] In the figure: 1, flexible protective sheet; 2, support keel; 3, counterweight anchor chain; 4, device reinforced ring; A, fan cylinder; B, fan gravity type foundation. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail below.

[0028] Reference Figs. 1-3The application discloses a scour protection umbrella combined device for a marine wind turbine gravity foundation, which comprises flexible protection sheets 1, support keels 2, counterweight anchor chains 3 and a device reinforcing ring 4.

[0029] The application has the advantages that the structure is simple, each component can be disassembled, convenient transportation and installation are realized, especially for the deep sea environment, simple installation steps and the disassemblable transportation characteristics can greatly reduce the transportation and installation costs, the simple structure can be prefabricated in a factory by using a standardized process, the quality is controllable, and fine adjustment can be realized according to the size of the wind turbine foundation and the data of the sea current and seabed near the wind turbine foundation.

[0030] Referring to Figs. 1-3 The support keel 2 is an arc-shaped structure concave downward, the surface of the support keel 2 is subjected to an anticorrosion process, the flexible protection sheet 1 is a flexible fan-shaped sheet made of an anticorrosive high-strength fiber reinforced composite material, and the diameter of the support keel 2 after being roughly cut is 3-4 times the diameter of the bottom of the gravity foundation of the marine wind turbine.

[0031] The application is different from the traditional riprap and caisson passive scouring scheme, the application actively changes and guides the near-bed water flow path around the pier through the unique horn-shaped structure design, can effectively lift the core of the horseshoe vortex away from the seabed surface, so that the core of the horseshoe vortex is suspended, thereby greatly weakening the ability of the core of the horseshoe vortex to scour and suck the sand downward, fundamentally reducing the local scouring depth and prolonging the service life of the wind turbine foundation, the application destroys the formation condition and stable structure of the horseshoe vortex from the physical root, realizes the effect that prevention is better than cure, and the application further disturbs the vortex by arranging the counterweight anchor chains, so that the protection efficiency is higher.

[0032] Specifically, when the sea current impacts the deep sea wind turbine foundation, the flexible protection sheet 1 integrated at the bottom of the foundation actively guides the water flow close to the seabed to the outside through the inclined surface with a certain arc, and lifts the core of the destructive vortex away from the seabed surface. This process changes the original path of the water flow so that the water flow cannot directly scour the base, and also destroys the stable structure of the horseshoe vortex, finally forms a benign flow field around the foundation, fundamentally inhibits the formation of the local scouring pit, ensures the long-term stability of the contact surface between the gravity foundation and the seabed, and the counterweight anchor chain 3 assists in disturbing the sea current, so that the inhibiting effect is better.

[0033] Referring to Figs. 1-3 The counterweight anchor chain 3 is a metal chain, and the surface thereof is treated by an anti-corrosion process. The inner diameter of the device reinforcing ring 4 is slightly larger than the outer diameter of the cylinder of the offshore wind turbine, and the surface thereof is treated by an anti-corrosion process.

[0034] The present application can adapt to various severe hydrological environments such as seawater, freeze-thaw cycle, etc. by adjusting the material and surface treatment, and has a wide application range.

[0035] It should be noted that, during the operation of the present application, the counterweight anchor chain 3 can prevent the present application from moving upward under the impact of strong sea current, and can also maintain the balance of the present application in each direction.

[0036] A construction method of a scour protection umbrella-shaped combined device for a gravity foundation of an offshore wind turbine, comprising the following steps:

[0037] S1, measuring and calculating seabed data and adjusting parameters of the umbrella-shaped combined device: according to the seabed topography and water depth, the parameters of the umbrella-shaped combined device are designed and the components are prefabricated;

[0038] S2, assembling: the module pre-assembly and testing are completed at the port or operation platform, the supporting keels 2 are first fixedly connected with the device reinforcing ring 4, then a plurality of flexible protection sheets 1 are installed between the supporting keels 2 and form an integral whole with the supporting keels 2, the flexible protection sheets 1 are deformed to be concave downward under the action of the supporting keels 2, after the installation of the flexible protection sheets 1 is completed, the counterweight anchor chain 3 is fixedly installed at the end of the supporting keel 2 away from the device reinforcing ring 4, and the assembly of the equipment is completed;

[0039] S3, installation and fixation: the assembled equipment is transported to the position of the wind turbine, then the device reinforcing ring 4 is sleeved on the wind turbine cylinder 1, and the counterweight anchor chain 3 is fixed by the external rope control type grappling hook, after the fixation is completed, the equipment sinks along the wind turbine cylinder 1 under the action of gravity until the lower side of the device reinforcing ring 4 contacts with the gravity foundation of the offshore wind turbine, and the installation is completed;

[0040] S4, correction: whether the equipment is in an inclined state is judged according to the pulling length of each rope control type grappling hook, if there is inclination, the corresponding rope control type grappling hook on the low side is pulled to right the equipment, then the rope control type grappling hook is controlled to release the counterweight anchor chain 3, and the correction work is completed.

[0041] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application, which are still covered by the protection scope of the present application.

Claims

1. A scour protection umbrella-shaped assembly for gravity foundations of marine wind turbines, characterized in that, Includes flexible protective sheet (1), supporting keel (2), counterweight anchor chain (3), and device reinforcing ring (4); Several supporting keels (2) are detachably fixed on the outside of the device's reinforcing ring (4). These supporting keels (2) are evenly distributed radially on the outside of the device's reinforcing ring (4). A flexible protective sheet (1) is detachably fixed between each pair of adjacent supporting keels (2). The end of the supporting keel (2) away from the device reinforcing ring (4) is fixedly connected to a counterweight anchor chain (3); During construction, the reinforcing ring (4) of the device needs to be fitted onto the cylinder of the marine wind turbine, and the reinforcing ring (4) of the device needs to contact the upper side of the gravity foundation of the marine wind turbine.

2. The scour protection umbrella-shaped assembly for gravity foundations of marine wind turbines according to claim 1, characterized in that, The supporting keel (2) is a downwardly concave arc-shaped structure, and its surface is treated with an anti-corrosion process.

3. The scour protection umbrella-shaped assembly for gravity foundations of marine wind turbines according to claim 2, characterized in that, The flexible protective sheet (1) is a flexible fan-shaped sheet made of corrosion-resistant high-strength fiber-reinforced composite material.

4. The scour protection umbrella-shaped assembly for gravity foundations of marine wind turbines according to claim 3, characterized in that, The diameter of the sweeping support keel (2) is 3-4 times the bottom diameter of the gravity foundation of the marine wind turbine.

5. The scour protection umbrella-shaped assembly for gravity foundations of marine wind turbines according to claim 1, characterized in that, The counterweight anchor chain (3) is a metal chain, and its surface has been treated with an anti-corrosion process.

6. The scour protection umbrella-shaped assembly for gravity foundations of marine wind turbines according to claim 1, characterized in that, The inner diameter of the reinforcing ring (4) of the device is slightly larger than the outer diameter of the cylinder of the marine wind turbine, and its surface is treated with an anti-corrosion process.

7. A construction method for a scour protection umbrella-shaped assembly for gravity foundations of offshore wind turbines, applied to the scour protection umbrella-shaped assembly for gravity foundations of offshore wind turbines as described in any one of claims 4-6, characterized in that, Includes the following steps: S1. Calculate seabed data and adjust the parameters of the umbrella-shaped assembly: Design the parameters of the umbrella-shaped assembly and prefabricate the components based on the seabed topography and water depth. S2. Assembly: Complete the pre-assembly and testing of the module at the port or work platform. First, fix the support keel (2) and the device stiffening ring (4) in place. Then, install several flexible protective plates (1) between the support keel (2) and form a whole with it. Under the action of the support keel (2), the flexible protective plate (1) will deform downward. After the flexible protective plate (1) is installed, fix the counterweight anchor chain (3) at the end of the support keel (2) away from the device stiffening ring (4) to complete the assembly of the equipment. S3. Installation and fixing: Transport the assembled equipment to the location of the wind turbine, then put the device stiffening ring (4) into the wind turbine cylinder (1), and then use the external rope-controlled hook to fix the counterweight anchor chain (3). After fixing, the equipment can be allowed to sink along the wind turbine cylinder (1) under the action of gravity until the lower side of the device stiffening ring (4) contacts the gravity foundation of the marine wind turbine, and the installation is completed. S4. Correction: Determine whether the equipment is tilted based on the pull-out length of each rope-controlled grab hook. If it is tilted, pull the rope-controlled grab hook corresponding to the lower side to straighten it. Then, control the rope-controlled grab hook to release the counterweight anchor chain (3) to complete the correction work.

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