Two-section spliced offshore wind power foundation structure

Abstract

The two-section type spliced offshore wind power foundation structure comprises a jacket body, a jacket upper section and four sets of connecting pieces, and the jacket upper section is integrally installed on the upper portion of the jacket body and is fixedly connected through the four sets of connecting pieces; each group of connecting pieces comprises a first connecting piece, a second connecting piece and a plurality of bolts; the first connecting piece comprises a first connecting sleeve and a first connecting disc; the second connecting piece comprises a second connecting sleeve, a second connecting disc and a bolt mounting disc; the first connecting piece is sleeved and fixed at the top end of a column leg of the jacket body through the first connecting sleeve, and the second connecting piece is sleeved and fixed at the bottom end of the column leg of the jacket upper section through the second connecting sleeve; the first connecting disc is located at the top end of the first connecting piece, the second connecting disc is located at the bottom end of the second connecting piece, and the first connecting disc and the second connecting disc are hollow discs. And the bolt mounting disc is parallel to the second connecting disc.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power technology, specifically to a two-section spliced ​​offshore wind power foundation structure. Background Technology

[0002] In current offshore wind power projects, jacket foundations are typically constructed and transported as a single unit. With increasing turbine capacity and water depth, jacket height is constantly increasing, placing higher demands on the deck space, lifting capacity, and stability of construction vessels during transport and hoisting. Simultaneously, complex sea conditions shorten the construction window and increase construction risks. Furthermore, the traditional "pile-first, then foundation" construction method relies on high-precision matching between the jacket and pre-driven piles. However, under large-scale structures, complex sea conditions, and seabed topography, controlling pile positioning accuracy is difficult, easily leading to installation deviations and increasing adjustment and rework costs.

[0003] Therefore, designing a jacket structure that can be assembled in sections and adapted to larger scales and complex sea conditions, as well as its installation technology, has significant engineering implications and application prospects. Summary of the Invention

[0004] The purpose of this invention is to provide a two-section spliced ​​offshore wind power foundation structure to solve the technical problems existing in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A two-section spliced ​​offshore wind power foundation structure includes a jacket body, an upper jacket section, and four sets of connectors. The upper jacket section is installed on the upper part of the jacket body and is fixedly connected by the four sets of connectors. Each set of connectors includes a first connector, a second connector, and multiple bolts; The first connector includes a first connecting sleeve and a first connecting plate, and the second connector includes a second connecting sleeve, a second connecting plate, and a bolt mounting plate; The first connector is fitted and fixed to the top of the column leg of the guide frame body through the first connecting sleeve, and the second connector is fitted and fixed to the bottom of the column leg of the upper section of the guide frame through the second connecting sleeve. The first connecting plate is located at the top of the first connecting member, and the second connecting plate is located at the bottom of the second connecting member. Both the first connecting plate and the second connecting plate are hollow discs. The bolt mounting plate is parallel to the second connecting plate, and the first connecting plate, the second connecting plate and the bolt mounting plate are all provided with multiple through holes at corresponding positions. The first connecting plate and the second connecting plate are in contact and their through holes are aligned. Each bolt passes through the through holes on the bolt mounting plate, the second connecting plate and the first connecting plate in sequence, and is then fixed with a fixing nut at the lower end of the first connecting plate.

[0006] In some embodiments, an adjustment region is formed between the bolt mounting disc and the second connecting disc. The adjustment region is a threaded columnar structure that can deform within its performance range.

[0007] In some embodiments, a threaded adjusting nut is provided on the outside of the bolt at a position close to the upper end of the second connecting disc; Furthermore, a spring is fitted on the outside of each bolt, and the upper and lower ends of the spring are respectively limited by the lower surface of the bolt mounting plate and the adjusting nut.

[0008] In some embodiments, four kits and eight steel piles are also included; Each of the four legs of the jacket structure is fixedly equipped with a kit, which includes three sleeves fixed as one piece. The three sleeves include a central sleeve in the middle and two side sleeves on both sides. The central sleeve is fitted and fixed to the bottom of the leg. A steel pile is fixedly installed in each of the two side sleeves, and each steel pile is obliquely inserted and fixed to the seabed.

[0009] In some embodiments, for any kit, the two side sleeves are inclined in different directions relative to the middle sleeve, so that the two steel piles corresponding to the two side sleeves form a scissor fork structure in space.

[0010] In some embodiments, the construction of the two-section spliced ​​offshore wind power foundation structure includes the following steps: S1. Complete the assembly of the initial structure, which includes a catheter frame body, four kits and eight guide tubes. The bottom ends of the eight guide tubes are placed in the eight side sleeves of the four kits respectively. The top end of each guide tube is detachably fixed to the catheter frame body by a customized fastener. S2. The initial structure is placed in seawater, and air is pumped into the internal cavity through the top opening of the jacket body to drain water, so that the initial structure can be suspended in the water and temporarily moored and fixed in the required position by external anchoring. S3. Eight steel piles are driven into the seabed soil through eight guide pipes, so that each steel pile passes through the guide pipe and the side sleeve of the kit and extends into the seabed soil. S4. After each steel pile has penetrated to a certain depth into the mud, operate the fastener of the corresponding guide tube to release it from the fixed connection with the guide tube body, then pull out and retrieve the guide tube, and then continue to complete the pile driving. S5. After each steel pile is driven, grout is injected into the corresponding side sleeve to fix the steel pile to the corresponding side sleeve. S6. After all steel piles have been driven and fixed, release the gas from the internal cavity of the jacket structure.

[0011] In some embodiments, during construction, after step S6, the following step is further included: S7. The four first connectors are respectively fixedly installed on the top of the four column legs of the guide frame body. Magnetic rods are pre-installed in each through hole of the first connecting plate, and upward-facing contact pins are installed in the first connecting sleeve. Fusible alloy powder and heating resistance coils are pre-installed in the second connecting sleeve, so that when the first connectors are connected and fixed to the second connectors, the contact pins and heating resistance coils form a circuit. S8. Connect the four second connectors to the first connector respectively. Before connecting, place the bolts that pass through the through holes of the bolt mounting plate and the second connector on the second connector. When connecting, hoist the second connector above the first connector. Under the magnetic force of the magnetic rod, the bolts will automatically align with the through holes of the first connector. After the bolts pass through the through holes of the first connector, take out the corresponding magnetic rod. S9. Hoist the upper section of the jacket to the required position, so that the four legs of the upper section of the jacket extend into the second connecting sleeves of the four second connectors to a certain depth, and the upper section of the jacket reaches the equilibrium position under the action of gravity. S10. Observe whether the top platform of the upper section of the jacket is horizontal. If not, adjust the adjusting nut according to the tilt direction until the top platform of the upper section of the jacket is horizontal. After adjustment, fix the multiple fixing nuts with the bolts extending from the lower end of the first connecting plate. S11. Power is supplied to the circuit formed by the contact pin and the heating resistance coil, so that the fusible alloy powder in the second connecting sleeve melts and flows downward to the gap between the column leg and the connector. After the power supply is stopped, the fusible alloy solidifies to achieve the fusion fixation of the conductor frame body, the upper section of the conductor frame and the connector.

[0012] Compared with the prior art, the advantages of the present invention are as follows: The two-section splicing offshore wind power foundation structure provided by this invention adopts an upper and lower segment structure, which reduces the difficulty of transportation and hoisting, and allows for a larger range of vertical deviation of the lower segment structure. In addition, the post-piling method is used to complete the construction, which reduces the risk of inaccurate steel pile positioning. The steel pile and jacket structure is stable and has low requirements for grouting. The guide pipes during the construction process can be reused, reducing resource waste. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is an overall schematic diagram of a two-section spliced ​​offshore wind power foundation structure provided by the present invention; Figure 2 This is an enlarged view of the connectors and related structures; Figure 3 This is an enlarged view of the first connector; Figure 4 for Figure 1 A partial structural diagram; Figure 5 for Figure 4 The corresponding top view; Figure 6 This is a schematic diagram of the intermediate structure during construction; Figure 7 for Figure 6 Enlarged view of part of the structure.

[0015] Explanation of reference numerals in the attached drawings: 1. Jacket body; 2. Upper section of jacket; 3. Kit; 4. Steel pile; 5. Guide tube; 6. Fastener; 7. Bolt; 8. Spring; 10. First connector; 11. First connecting sleeve; 12. First connecting plate; 13. Magnetic rod; 14. Contact pin; 20. Second connector; 21. Second connecting sleeve; 22. Second connecting plate; 23. Bolt mounting plate; 24. Adjustment area; 25. Fixing nut; 26. Adjusting nut. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following description, in conjunction with the accompanying drawings and specific embodiments, further explains how this invention is implemented.

[0017] In one specific embodiment, refer to Figures 1-3As shown, this invention provides a two-section spliced ​​offshore wind power foundation structure, including a jacket body 1, an upper jacket section 2, and four sets of connectors. The upper jacket section 2 is installed on the upper part of the jacket body 1 and is fixedly connected by the four sets of connectors. Each set of connectors includes a first connector 10, a second connector 20, and multiple bolts 7. The first connector 10 includes a first connecting sleeve 11 and a first connecting plate 12, and the second connector 20 includes a second connecting sleeve 21, a second connecting plate 22, and a bolt mounting plate 23. The first connector 10 is fitted and fixed to the top of the column leg of the jacket body 1 through the first connecting sleeve 11, and the second connector 20 is fitted through the second connecting sleeve 21. The first connecting plate 12 is located at the top of the first connecting member 10, and the second connecting plate 22 is located at the bottom of the second connecting member 20. Both the first connecting plate 12 and the second connecting plate 22 are hollow discs. The bolt mounting plate 23 is parallel to the second connecting plate 22. The first connecting plate 12, the second connecting plate 22 and the bolt mounting plate 23 are all provided with multiple through holes at corresponding positions. The first connecting plate 12 and the second connecting plate 22 are in contact with each other and the through holes are aligned. Each bolt 7 passes through the through holes on the bolt mounting plate 23, the second connecting plate 22 and the first connecting plate 12 in sequence, and is then fixed with the fixing nut 25 at the lower end of the first connecting plate 12.

[0018] Preferably, an adjustment area 24 is formed between the bolt mounting disc 23 and the second connecting disc 22. The adjustment area 24 is a threaded columnar structure that can deform within its performance range.

[0019] Preferably, a threaded adjusting nut 26 is provided on the outside of the bolt 7 at a position close to the upper end of the second connecting plate 22; and a spring 8 is sleeved on the outside of each bolt 7, with the upper and lower ends of the spring 8 limited by the lower surface of the bolt mounting plate 23 and the adjusting nut 26, respectively.

[0020] Preferably, refer to Figure 4 As shown, the two-section spliced ​​offshore wind power foundation structure also includes four kits 3 and eight steel piles 4; each of the four columns of the jacket body 1 is fixedly equipped with a kit 3. The kit 3 includes three sleeves fixed as one unit. The three sleeves include a middle sleeve located in the middle and two side sleeves located on both sides; the middle sleeve is sleeved and fixed to the bottom of the column leg, and a steel pile 4 is fixedly installed in each of the two side sleeves, and each steel pile 4 is obliquely inserted and fixed to the seabed.

[0021] Preferably, refer to Figure 5 As shown, for any kit 3, the two side sleeves are inclined in different directions relative to the middle sleeve, so that the two steel piles 4 corresponding to the two side sleeves form a scissor fork structure in space.

[0022] In this embodiment, the construction of the two-section spliced ​​offshore wind power foundation structure includes the following steps: S1. Reference Figure 6 and Figure 7 As shown, the initial structure is assembled, including the catheter holder body 1, four kits 3, and eight guide tubes 5. The bottom ends of the eight guide tubes 5 are respectively placed inside the eight side sleeves of the four kits 3. The top end of each guide tube 5 is detachably fixed to the catheter holder body 1 by a customized fastener 6. The fastener 6 can be... Figure 7 The metal clamp shown.

[0023] S2. The initial structure is placed into the seawater, and air is pumped into the internal cavity through the top opening of the jacket body 1 to allow the initial structure to be suspended in the water. Under the action of external anchoring, it is temporarily moored and fixed in the required position. When it is no longer necessary to temporarily moor, the temporary mooring can be released in time.

[0024] S3. Eight steel piles 4 are driven into the seabed soil through eight guide pipes 5, so that each steel pile 4 passes through the guide pipe 5 and the side sleeve of the kit 3. Under the action of the guide pipe 5, the steel piles 4 have good control accuracy at the beginning of the pile driving.

[0025] S4. When each steel pile 4 has penetrated into the mud to a certain depth (e.g., 6-10m), it requires a lot of work to continue to penetrate the steel pile 4 into the mud at an angle. At this time, the fastener 6 of the corresponding guide tube 5 can be operated to release it from the fixed connection with the guide frame body 1, and then the guide tube 5 can be pulled out and retrieved. After the guide tube 5 is pulled out in advance, the pile driving can continue, thereby reducing the vibration and internal collision of the guide frame body 1. The pulled-out guide tube 5 can be recycled after being returned to the factory.

[0026] S5. After each steel pile 4 is driven, grout is injected into the corresponding side sleeve to fix the steel pile 4 to the corresponding side sleeve.

[0027] S6. After all steel piles 4 have been driven and fixed, release the gas in the cavity inside the jacket body 1.

[0028] Because the steel piles 4 driven in using the post-pile method form a "scissor fork" shape in space, they can provide displacement constraint for the jacket body 1 in all directions. The grouting inside the casing only serves a filling function. The pile length control is flexible, and there is no need to weld shear components at the joint between the piles and the pile group kit, thus ensuring the reliability of the connection. In addition, if the verticality deviation of the jacket body 1 is large, the guide tube 5 can be used to hammer the top of the kit 3 a second time to correct the deviation.

[0029] S7. The four first connectors 10 are respectively fixedly installed on the top of the four column legs of the guide frame body 1. Magnetic rods 13 are pre-installed in each through hole of the first connecting plate 12. An upward-facing contact pin 14 is installed in the first connecting sleeve 11. Fusible alloy powder (melting point about 130°C) and a heating resistance coil are pre-installed in the second connecting sleeve 21. When the first connector 10 and the second connector 20 are connected and fixed, the contact pin 14 and the heating resistance coil form a circuit.

[0030] S8. Connect the four second connectors 20 to the first connectors 10 respectively. Before connection, place bolts 7 through the through holes of the bolt mounting plate 23 and the second connecting plate 22 on the second connectors 20. During connection, hoist the second connectors 20 above the first connectors 10. Under the magnetic force of the magnetic rod 13, the bolts 7 automatically align with the through holes of the first connecting plate 12. After the bolts 7 pass through the through holes of the first connecting plate 12, remove the corresponding magnetic rod 13. Because of the installation of the magnetic rod 13, the second connectors 20 and the first connectors 10 can be automatically and quickly aligned by magnetic force, which greatly reduces the difficulty of connection under sea conditions and improves the connection accuracy.

[0031] S9. Hoist the upper section 2 of the jacket to the required position, so that the four legs of the upper section 2 of the jacket extend into the second connecting sleeves 21 of the four second connecting parts 20 to a certain depth, so that the upper section 2 of the jacket reaches the equilibrium position under the action of gravity.

[0032] S10. Observe whether the top platform of the upper section 2 of the jacket is horizontal. If not, fine-tune the adjusting nut 26 according to the tilt direction until the top platform of the upper section 2 of the jacket is horizontal. After adjustment, fix the multiple fixing nuts 25 with the bolts 7 extending from the lower end of the first connecting plate 12. It can be understood that when fine-tuning the adjusting nut 26, the length of the bolt 7 extending from the lower end of the first connecting plate 12 can be changed, thereby fine-tuning the level of the body. The spring 8 plays a buffering role in the fine-tuning process.

[0033] S11. Power is supplied to the circuit formed by the contact pin 14 and the heating resistance coil, so that the fusible alloy powder in the second connecting sleeve 21 is melted and flows down to the gap between the column leg and the connector. After the power supply is stopped, the fusible alloy solidifies, so as to realize the fusion fixation of the conductor frame body 1, the upper section of the conductor frame 2 and the connector, forming a rigid joint.

[0034] In this embodiment, the heights of the upper section 2 of the catheter frame and the main body 1 of the catheter frame can be 28m and 82m respectively, with a total height of approximately 110m.

[0035] In summary, the two-section splicing offshore wind power foundation structure provided by this invention adopts an upper and lower segment structure, which reduces the difficulty of transportation and hoisting, and allows for a larger range of vertical deviation of the lower segment structure. In addition, the use of the post-piling method to complete the construction reduces the risk of inaccurate steel pile positioning. The steel pile and jacket structure are stable and have low requirements for grouting. The guide pipes used in the construction process can be reused, reducing resource waste.

[0036] Finally, it should be noted that the above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A two-section spliced ​​offshore wind power foundation structure, characterized in that, It includes a catheter frame body (1), a catheter frame upper section (2) and four sets of connectors. The catheter frame upper section (2) is installed on the upper part of the catheter frame body (1) and is fixedly connected by the four sets of connectors. Each set of connectors includes a first connector (10), a second connector (20), and multiple bolts (7); The first connector (10) includes a first connecting sleeve (11) and a first connecting plate (12), and the second connector (20) includes a second connecting sleeve (21), a second connecting plate (22) and a bolt mounting plate (23). The first connector (10) is fitted and fixed to the top of the column leg of the duct frame body (1) through the first connecting sleeve (11), and the second connector (20) is fitted and fixed to the bottom of the column leg of the upper section (2) of the duct frame through the second connecting sleeve (21). The first connecting plate (12) is located at the top of the first connecting member (10), and the second connecting plate (22) is located at the bottom of the second connecting member (20). Both the first connecting plate (12) and the second connecting plate (22) are hollow discs. The bolt mounting plate (23) is parallel to the second connecting plate (22), and multiple through holes with corresponding positions are provided on the first connecting plate (12), the second connecting plate (22) and the bolt mounting plate (23); The first connecting plate (12) is in contact with the second connecting plate (22) and the through holes are aligned. Each bolt (7) passes through the through holes on the bolt mounting plate (23), the second connecting plate (22) and the first connecting plate (12) in sequence, and is then fixed with the fixing nut (25) at the lower end of the first connecting plate (12).

2. The two-section spliced ​​offshore wind power foundation structure according to claim 1, characterized in that, An adjustment area (24) is formed between the bolt mounting disc (23) and the second connecting disc (22). The adjustment area (24) is a threaded columnar structure that can deform within its performance range.

3. The two-section spliced ​​offshore wind power foundation structure according to claim 2, characterized in that, At the position close to the upper end of the second connecting plate (22), an adjusting nut (26) with thread engagement is provided on the outside of the bolt (7); Furthermore, each bolt (7) is fitted with a spring (8) on its outer side, and the upper and lower ends of the spring (8) are respectively limited by the lower surface of the bolt mounting plate (23) and the adjusting nut (26).

4. The two-section spliced ​​offshore wind power foundation structure according to claim 3, characterized in that, It also includes four kits (3) and eight steel piles (4); Each of the four columns of the jacket body (1) is fixedly provided with a kit (3). The kit (3) includes three sleeves fixed as one unit. The three sleeves include a middle sleeve located in the middle and two side sleeves located on both sides. The middle sleeve is sleeved and fixed to the bottom of the column leg. A steel pile (4) is fixedly installed in each of the two side sleeves, and each steel pile (4) is obliquely inserted and fixed to the seabed.

5. The two-section spliced ​​offshore wind power foundation structure according to claim 4, characterized in that, For any kit (3), the two side sleeves are tilted in different directions relative to the middle sleeve, so that the two steel piles (4) corresponding to the two side sleeves form a scissor fork structure in space.

6. The two-section spliced ​​offshore wind power foundation structure according to claim 5, characterized in that, The construction of this two-section spliced ​​offshore wind power foundation includes the following steps: S1. Complete the assembly of the initial structure, which includes the catheter frame body (1), four kits (3) and eight guide tubes (5). The bottom ends of the eight guide tubes (5) are placed in the eight side sleeves of the four kits (3). The top end of each guide tube (5) is detachably fixed to the catheter frame body (1) through a customized fastener (6). S2. The initial structure is placed into the seawater, and air is pumped into the internal cavity at the top opening of the jacket body (1) to drain water, so that the initial structure can be suspended in the water and temporarily moored and fixed in the required position under the action of external anchor. S3. Eight steel piles (4) are driven into the seabed soil through eight guide pipes (5) respectively, so that each steel pile (4) passes through the guide pipe (5) and the side sleeve of the kit (3) and extends into the seabed soil. S4. When each steel pile (4) is driven into the mud to a certain depth, operate the fastener (6) of the corresponding guide pipe (5) to release it from the fixed connection with the guide frame body (1), then pull out and recycle the guide pipe (5), and then continue to complete the pile driving. S5. After each steel pile (4) is driven, grout is injected into the corresponding side sleeve to fix the steel pile (4) and the corresponding side sleeve. S6. After completing the driving and fixing of all steel piles (4), release the gas in the internal cavity of the guide frame body (1).

7. The two-section spliced ​​offshore wind power foundation structure according to claim 6, characterized in that, During construction, after step S6, the following steps are also included: S7. The four first connectors (10) are respectively fixedly installed on the top of the four column legs of the guide frame body (1). In addition, a magnetic rod (13) is set in each through hole of the first connecting plate (12), an upward-facing contact pin (14) is set in the first connecting sleeve (11), and a fusible alloy powder and a heating resistance coil are preset in the second connecting sleeve (21). When the first connector (10) and the second connector (20) are connected and fixed, the contact pin (14) and the heating resistance coil form a circuit. S8. Connect the four second connectors (20) to the first connector (10) respectively. Before connecting, place the bolts (7) that pass through the through holes of the bolt mounting plate (23) and the second connector (22) on the second connectors (20). When connecting, hoist the second connectors (20) above the first connectors (10). Under the magnetic force of the magnetic rod (13), the bolts (7) will automatically align with the through holes of the first connector (12). After the bolts (7) pass through the through holes of the first connector (12), take out the corresponding magnetic rod (13). S9. Hoist the upper section (2) of the jacket to the required position, so that the four legs of the upper section (2) of the jacket extend into the second connecting sleeve (21) of the four second connecting parts (20) to a certain depth, so that the upper section (2) of the jacket reaches the equilibrium position under the action of gravity. S10. Observe whether the top platform of the upper section (2) of the guide frame is in the horizontal direction. If not, adjust the adjusting nut (26) according to the tilt direction until the top platform of the upper section (2) of the guide frame is in the horizontal direction. After the adjustment is completed, fix the multiple fixing nuts (25) with the bolts (7) extending from the lower end of the first connecting plate (12). S11. Power is supplied to the circuit formed by the contact pin (14) and the heating resistance coil to heat up the fusible alloy powder in the second connecting sleeve (21) and make it melt and flow downward to the gap between the column leg and the connector. After the power supply is stopped, the fusible alloy solidifies to achieve the fusion fixation of the conductor frame body (1), the upper section of the conductor frame (2) and the connector.

Images