A device and method for prefabricating a hexagonal offshore wind turbine cylinder foundation on water

Abstract

The present invention provides a device and method for prefabricating a hexagonal offshore wind power cylindrical foundation on water, the device comprises a prefabricated sinking pad, columns are arranged at the corners of the prefabricated sinking pad, a clamp is arranged on the outside of the column, a positioning pile that can move up and down along the column is penetrated by the clamp, a prefabricated base is embedded in the upper surface of the prefabricated sinking pad, a maintenance sinking pad is also arranged on the upper surface of the prefabricated sinking pad, and the hexagonal offshore wind power cylindrical foundation on water prefabricated device also includes a cylindrical foundation casting mold. The present invention prolongs the maintenance time and greatly improves the prefabrication efficiency of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of installation of an offshore wind power cylindrical foundation, and more specifically, to an above-water prefabrication device and method for a hexagonal offshore wind power cylindrical foundation. Background Art

[0002] In recent years, the scale development of offshore wind power has accelerated significantly around the world. Outside of Europe, China has quickly become a new growth engine. According to statistics from the National Energy Administration, in 2019, my country's new offshore wind power installed capacity reached 1.98 million kilowatts, and the cumulative installed capacity reached 5.93 million kilowatts. At present, my country's offshore wind power is still in the early stages of large-scale development. In order to further implement the goal of grid parity, my country's offshore wind power will inevitably develop in the direction of deep sea, large capacity and low cost in the future.

[0003] The marine environment is complex (affected by loads such as wind, waves, currents, and operation), and the proportion of investment in offshore wind power infrastructure (20% to 30%) is usually much higher than that of similar onshore wind farms. It is crucial to choose a reasonable wind power infrastructure. At present, the more common offshore wind power infrastructure structures include pile foundations, multi-pile caps, tripods, conductor racks, gravity types, etc. In recent years, with the development of technology in the field of marine geotechnical engineering, the research and application of barrel foundations have developed rapidly. The basic characteristics of the barrel foundation are that it does not require the bearing capacity of deep soil like the pile foundation, nor does it place high requirements on the bearing capacity of the surface soil like the gravity foundation. It has a fast construction speed, can effectively utilize the offshore operation window period, has low noise during installation, is easy to dismantle, and has low cost. In the future, considering further reducing costs, improving the safety performance of hoisting and floating, and the bearing performance of foundation operation, the barrel foundation structure will gradually develop from steel barrels to concrete barrels, and the structural form will gradually develop from circular to polygonal.

[0004] At present, the prefabrication of the barrel foundation is completed on the port shore. The prefabrication process will occupy a large amount of land resources, thereby increasing the prefabrication cost and inhibiting the prefabrication speed. At the same time, for wind farms far offshore, the transportation distance is long and the construction efficiency is reduced. Therefore, there is an urgent need in the prior art for a technical solution suitable for the water prefabrication of polygonal concrete barrel foundations, so that the barrel foundation can be reused in different sea areas, and can be quickly prefabricated and installed, improve efficiency, and reduce costs. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a device and method for prefabricating a hexagonal offshore wind turbine cylinder foundation on water.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A hexagonal offshore wind power cylindrical foundation water prefabrication device comprises a prefabricated pad, columns are arranged at the corners of the prefabricated pad, a clamping ring is arranged on the outside of the column, a positioning pile that can move up and down along the column is penetrated by the clamping ring, a prefabricated base is embedded in the upper surface of the prefabricated pad, a maintenance pad is also arranged on the upper surface of the prefabricated pad, and the hexagonal offshore wind power cylindrical foundation water prefabrication device also comprises a cylindrical foundation casting mold.

[0008] The cylindrical foundation casting mold comprises an outer steel membrane and an inner steel membrane arranged in a hexagonal shape, a casting partition plate is arranged between the outer steel membrane and the inner steel membrane, and a partition plate is also arranged inside the inner steel membrane.

[0009] The partition plate divides the regular hexagonal prism space inside the steel film in the cylinder wall into one regular hexagonal prism silo and six trapezoidal prism silos.

[0010] The prefabricated sink pad is a steel square box structure with a hollow interior.

[0011] The prefabricated cushion is provided with air holes.

[0012] The prefabricated base is a concrete structure.

[0013] The maintenance mat is a steel square box structure with a hollow interior.

[0014] The maintenance mat is provided with drainage and air-filling holes.

[0015] The maintenance mats are arranged layer by layer from bottom to top, and the number of the maintenance mats is 2-4.

[0016] The present invention also proposes the following technical solution.

[0017] A method for prefabricating a hexagonal offshore wind turbine cylindrical foundation on water, comprising the following steps:

[0018] S1. Arrange the maintenance mats one by one on the prefabricated mats, and float the whole machine consisting of the prefabricated mats, columns, positioning piles and clamps. When the whole machine arrives at the prefabrication site, inflate the maintenance mats so that the maintenance mats float around the prefabricated mats one by one;

[0019] S2. Pour water into the curing mat to make it sink to the designated position;

[0020] S3. According to the designed hexagonal offshore wind power cylindrical foundation, select appropriate outer steel membrane of the cylinder wall, inner steel membrane of the cylinder wall and casting partition plate, assemble and weld them on the prefabricated sinking pad, then set up the partition plate and weld them, and then cover the top of the inner steel membrane of the cylinder wall with the cylinder top cover and weld them;

[0021] S4, pouring concrete. During the pouring process, the prefabricated sinking pad sinks. At the same time, air is inflated into the silo separated by the silo plate through the air-injection holes on the silo top cover, so that the silo is separated from the prefabricated sinking pad and floats;

[0022] S5. After floating the hexagonal offshore wind power cylindrical foundation to the location of the maintenance submerged pad, sink the hexagonal offshore wind power cylindrical foundation until the silo is stably seated on the maintenance submerged pad, and then continue to cast all the silo walls and silo top covers; while casting, maintain the parts that have been cast; at the same time, start prefabrication of the next hexagonal offshore wind power cylindrical foundation on the prefabricated submerged pad;

[0023] S6. Prefabricate the transition section on the top cover of the cylinder to complete the prefabrication of the entire hexagonal offshore wind power cylinder foundation;

[0024] S7. After the prefabrication of the hexagonal offshore wind turbine cylindrical foundation is completed, air is pumped inside the silo to make the hexagonal offshore wind turbine cylindrical foundation float out of the water, and then the hexagonal offshore wind turbine cylindrical foundation is floated to the designated location for sinking;

[0025] S8. After all the barrel foundations are prefabricated, the maintenance mats are pumped out of the water and inflated to make them float to the surface. The maintenance mats are then placed one by one on the prefabricated mats, and the entire machine is floated to the next designated location for prefabrication work.

[0026] The beneficial effects of the present invention compared with the prior art are:

[0027] 1. First, most of the pouring work of the hexagonal barrel foundation wall is completed on the prefabricated pad, and finally the remaining barrel wall pouring and later maintenance are completed on the maintenance pad, which realizes the single pouring of the barrel foundation and multiple maintenance at the same time, prolongs the maintenance time, and greatly improves the prefabrication efficiency of the device.

[0028] 2. The prefabricated sinking pad is equipped with columns to ensure the stability of the device during floating and sinking and provide a large restoring torque. At the same time, the columns can accommodate construction personnel and place necessary construction equipment.

[0029] 3. The outer steel membrane of the cylinder wall, the inner steel membrane of the cylinder wall and the partition plate are integrated and modular structures, which can be assembled quickly and form a whole after assembly and welding. The structure is stable before pouring, and the strength and corrosion resistance of the cylinder wall can be further enhanced after pouring, achieving multiple goals at one stroke.

[0030] 4. The device has a simple structure, is detachable, and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of placing a maintenance mat on the whole machine in the present invention.

[0032] Figure 2 It is a structural schematic diagram of the whole machine in the present invention.

[0033] Figure 3 It is a schematic structural diagram of the present invention after the cylinder wall template is erected.

[0034] Figure 4 It is a schematic diagram of the structure after the cylinder wall is partially cast and the sinking pad is sunk.

[0035] Figure 5 It is a schematic diagram of the structure of a partially cast barrel foundation after floating.

[0036] Figure 6 This is a state diagram of the barrel foundation casting mold placed on the maintenance pad.

[0037] Figure 7 This is the status diagram after the cylinder wall is poured.

[0038] Figure 8 This is a diagram of the state of the hexagonal offshore wind turbine cylinder foundation after prefabrication.

[0039] Figure numerals: 1. Prefabricated sinker; 2. Column; 3. Positioning pile; 4. Clamp; 5. Prefabricated base; 6. Maintenance sinker; 7. Steel membrane outside cylinder wall; 8. Steel membrane inside cylinder wall; 9. Casting partition board; 10. Dividing compartment board; 11. Cylinder wall; 12. Cylinder top cover; 13. Transition section. DETAILED DESCRIPTION

[0040] The present invention will be further described below based on specific implementation methods.

[0041] like Figure 1-8The hexagonal offshore wind power cylinder-type foundation water prefabricated device shown includes a prefabricated sinking pad 1, which is a steel square box structure with a hollow interior. In this embodiment, the prefabricated sinking pad 1 is 49 meters long and 49 meters wide, and 3 meters high. The prefabricated sinking pad 1 is provided with air holes. Columns 2 are provided at the corners of the prefabricated sinking pad 1. In this embodiment, the cross-sectional side length of the column 2 is 4 meters and the height is 12 meters. Construction personnel live inside the column, and floating, sinking, prefabrication, casting, maintenance and other equipment are placed. A clamping ring 4 is provided on the outside of the column 2, and a positioning pile 3 that can move up and down along the column 2 is penetrated by the clamping ring 4. In this embodiment, the positioning pile 3 is 20 meters long, and a buckle that can fix the positioning pile 3 is provided on the clamping ring 4. A prefabricated base 5 is embedded in the upper surface of the prefabricated sinking pad 1, and the prefabricated base 5 is a concrete structure. The shape of the prefabricated base 5 is a ring corridor composed of two layers of regular hexagons inside and outside, and its outer contour is consistent with the outer contour of the largest hexagonal barrel foundation that needs to be prefabricated; the inner contour is consistent with the inner contour of the smallest hexagonal barrel foundation that needs to be prefabricated. In this embodiment, the outer contour diameter is 45m and the inner contour diameter is 30m. A maintenance pad 6 is also provided on the upper surface of the prefabricated pad 1, and the maintenance pad 6 is also a steel square box structure with a hollow interior. Drainage and air filling holes are provided on the maintenance pad 6. The maintenance pads 6 are arranged layer by layer from bottom to top, and the number of maintenance pads 6 is 2-4. The thickness of each maintenance pad 6 is consistent with that of the prefabricated pad 1. In this embodiment, the plane size of each maintenance pad 6 is 47*47m, and the thickness is consistent with that of the prefabricated pad, and the number is 3. The hexagonal offshore wind power barrel foundation water prefabrication device also includes a barrel foundation casting mold. The cylindrical foundation casting mold includes a cylindrical wall outer steel membrane 7 and a cylindrical wall inner steel membrane 8 arranged in a hexagonal shape, and a casting partition plate 9 is arranged between the cylindrical wall outer steel membrane 7 and the cylindrical wall inner steel membrane 8. In this embodiment, 18 casting partition plates are arranged. A partition plate 10 is also arranged inside the cylindrical wall inner steel membrane 8. The partition plate 10 divides the regular hexagonal prism space inside the cylindrical wall inner steel membrane 8 into a regular hexagonal prism silo and six trapezoidal prism silos. In this embodiment, the diameter of the prefabricated hexagonal offshore wind power cylindrical foundation is 45m.

[0042] The method for prefabricating a hexagonal offshore wind power cylindrical foundation on water using the above device comprises the following steps:

[0043] S1, arrange the maintenance mats 6 one by one on the prefabricated mat 1, and float the whole machine consisting of the prefabricated mat 1, the column 2, the positioning pile 3 and the clamp ring 4. When the whole machine arrives at the prefabrication site, inflate the maintenance mats 6 so that the maintenance mats 6 float around the prefabricated mat 1 one by one;

[0044] S2, injecting water into the maintenance mat 6 through the drainage and inflation holes to make the maintenance mat 6 sink to the specified position;

[0045] S3. According to the designed hexagonal offshore wind power cylindrical foundation, select appropriate outer steel membrane 7, inner steel membrane 8, cast partition plate 9 and partition plate 10, and assemble and weld them on the prefabricated sinking pad 1. In this embodiment, the outer contour diameter is 45m and the inner contour diameter is 30m. Therefore, after the selected steel membrane and steel plate are spliced, the diameter of the circumscribed circle of the regular hexagonal prism formed by the outer steel membrane 7 of the cylinder wall shall not exceed 45m, and the diameter of the inscribed circle of the regular hexagonal prism formed by the inner steel membrane 8 of the cylinder wall shall not be less than 30m; then set up the partition plate 10 and weld it, and then cover the top of the inner steel membrane 8 of the cylinder wall with the cylinder top cover 12 and weld it; the shape and size of the cylinder top cover 12 are exactly the same as the regular hexagon surrounded by the inner steel membrane 8 of the cylinder wall, and the cylinder top cover 12 completely covers the inner steel membrane 8 of the cylinder wall, and the cylinder top cover 12 is also provided with an air hole;

[0046] S4, pouring concrete. During the pouring process, the prefabricated submerged pad 1 sinks under the gravity of the cylinder wall 11. At the same time, air is inflated into the silo separated by the compartment plate 10 through the air holes on the cylinder top cover 12, so that the silo is separated from the prefabricated submerged pad 1 and floats;

[0047] S5. After the hexagonal offshore wind power cylindrical foundation is floated to the location of the maintenance submerged pad 6, the hexagonal offshore wind power cylindrical foundation is sunk until the silo is stably seated on the maintenance submerged pad 6, and all pouring work of the cylinder wall 11 and the cylinder top cover 12 is continued; while pouring, the already poured parts are maintained; at the same time, the prefabrication work of the next hexagonal offshore wind power cylindrical foundation is started on the prefabricated submerged pad 1, and the steel membrane and steel plate used for the next cylindrical foundation are assembled and welded;

[0048] S6. Prefabricate the transition section 13 on the cylinder top cover 12, first weld it, then cast it, and complete the prefabrication of the entire hexagonal offshore wind power cylinder foundation;

[0049] S7. After the prefabrication of the hexagonal offshore wind power cylinder foundation is completed, air is pumped into the silo through the air-injection holes provided on the cylinder top cover 12 to make the hexagonal offshore wind power cylinder foundation float out of the water, and then the hexagonal offshore wind power cylinder foundation is floated to the designated location for sinking;

[0050] S8. After all the hexagonal offshore wind turbine cylindrical foundations are prefabricated, the maintenance mat 6 is pumped out and inflated through the drainage and air extraction holes to make the maintenance mat 6 float to the surface, and then the maintenance mats 6 are arranged one by one on the prefabricated mat 1, and then the whole machine is floated to the next designated location for prefabrication work.

[0051] During the pouring process of the previous cylindrical foundation, it is transferred from the prefabricated pad 1 to the maintenance pad 6, so the prefabrication of the next cylindrical foundation can be started before the prefabrication of the previous cylindrical foundation is completed; and for each cylindrical foundation itself, it can be poured and maintained at the same time, which greatly improves the construction efficiency of batch prefabricated cylindrical foundations.

[0052] In the description of the present invention, it should be understood that the terms "first", "end", "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] The above is only a preferred embodiment of the present invention, but the present invention is not limited to the above specific embodiments. For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A hexagonal offshore wind turbine cylindrical foundation prefabricated device comprising a prefabricated sinking pad (1), characterized in that: The prefabricated mat (1) is provided with columns (2) at the corners, a clamping ring (4) is provided on the outside of the column (2), and a positioning pile (3) is penetrated by the clamping ring (4) and can move up and down along the column (2). A prefabricated base (5) is embedded in the upper surface of the prefabricated mat (1), and a maintenance mat (6) is also provided on the upper surface of the prefabricated mat (1). The hexagonal offshore wind power cylindrical foundation water prefabrication device also includes a cylindrical foundation casting mold; The cylindrical foundation casting mold comprises a cylindrical wall outer steel film (7) and a cylindrical wall inner steel film (8) arranged in a hexagonal shape, a casting partition plate (9) is arranged between the cylindrical wall outer steel film (7) and the cylindrical wall inner steel film (8), and a partition plate (10) is also arranged inside the cylindrical wall inner steel film (8); The maintenance mats (6) are arranged layer by layer from bottom to top, and the number of the maintenance mats (6) is 2-4.

2. The hexagonal offshore wind power cylinder-type foundation water prefabrication device according to claim 1 is characterized in that: The compartment dividing plate (10) divides the regular hexagonal prism space inside the steel membrane (8) in the cylinder wall into one regular hexagonal prism silo and six trapezoidal prism silos.

3. The hexagonal offshore wind power cylinder-type foundation water prefabrication device according to claim 1 is characterized in that: The prefabricated sink (1) is a steel square box structure with a hollow interior.

4. The hexagonal offshore wind power cylinder-type foundation water prefabrication device according to claim 3 is characterized in that: The prefabricated mat (1) is provided with air holes.

5. The hexagonal offshore wind power cylinder-type foundation water prefabrication device according to claim 1 is characterized in that: The prefabricated base (5) is a concrete structure.

6. The hexagonal offshore wind power cylinder-type foundation water prefabrication device according to claim 1 is characterized in that: The maintenance mat (6) is a steel square box structure with a hollow interior.

7. The hexagonal offshore wind power cylinder-type foundation water prefabrication device according to claim 6 is characterized in that: The maintenance mat (6) is provided with drainage and air-filling holes.

8. A method for prefabricating a hexagonal offshore wind power cylindrical foundation water prefabricated device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, arranging the maintenance mats (6) one by one on the prefabricated mat (1), and floating the whole machine consisting of the prefabricated mat (1), the column (2), the positioning pile (3) and the clamping ring (4); when the whole machine arrives at the prefabrication site, inflating the maintenance mats (6) so that the maintenance mats (6) float one by one around the prefabricated mat (1); S2, injecting water into the curing mat (6) to make the curing mat (6) sink to a designated position; S3. According to the designed hexagonal offshore wind power cylindrical foundation, a suitable cylindrical wall outer steel membrane (7), cylindrical wall inner steel membrane (8), casting partition plate (9) and compartment plate (10) are selected, and assembled and welded on the prefabricated sinking pad (1), and then the compartment plate (10) is erected and welded, and then the cylindrical top cover (12) is covered on the top of the cylindrical wall inner steel membrane (8) and welded; S4, pouring concrete, during which the prefabricated sinking pad (1) sinks, and at the same time, air is inflated into the silos separated by the silo plates (10) through the air holes on the silo top cover (12), so that the hexagonal offshore wind turbine silo foundation being poured is separated from the prefabricated sinking pad (1) and floats; S5. After the hexagonal offshore wind power cylindrical foundation is floated to the location of the maintenance submerged pad (6), the hexagonal offshore wind power cylindrical foundation is sunk until the silo is stably seated on the maintenance submerged pad (6), and then all pouring work of the silo wall (11) and the silo top cover (12) is continued; while pouring, the already poured parts are maintained; at the same time, the prefabrication work of the next hexagonal offshore wind power cylindrical foundation is started on the prefabricated submerged pad (1); S6. Prefabricate a transition section (13) on the cylinder top cover (12) to complete the prefabrication of the entire hexagonal offshore wind power cylinder foundation; S7. After the prefabrication of the hexagonal offshore wind turbine cylindrical foundation is completed, air is pumped into the silo to make the hexagonal offshore wind turbine cylindrical foundation float out of the water, and then the hexagonal offshore wind turbine cylindrical foundation is floated to the designated location for sinking; S8. After all the barrel foundations are prefabricated, the maintenance mat (6) is pumped out of water and inflated to make it float to the surface. The maintenance mats (6) are then placed one by one on the prefabricated mat (1), and the entire machine is floated to the next designated location for prefabrication.

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