Large diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines

Abstract

The present invention relates to a prestressed core-solidified soil combined reinforcement system for large-diameter steel pipe piles for offshore wind turbines, and proposes two support system conversion platforms: a floating support platform and a clamp support platform. Different working platforms can be flexibly selected according to the depth of seawater, and both working platforms can provide stable and reliable support for wind turbine pillars to ensure smooth reinforcement operations; the wind turbine pipe piles have built-in rigid reinforcement steel frames to reinforce damaged wind turbine pipe piles, and the internally poured micro-expansive concrete can prevent corrosion of the slow-strengthening steel frame, improve the integrity of the rigid steel bars to the wind turbine pipe piles, and ensure the bearing capacity of the structure; anchor steel pipe piles are driven into the seabed around the wind turbine pipe piles, and the wind turbine pipe piles are tensioned and anchored by prestressed traction bars to improve the stability of the wind turbine pipe piles.

Description

Technical Field

[0001] The invention belongs to the field of wind turbine pipe pile reinforcement construction, and in particular relates to a large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines. Background Art

[0002] As the operation time of offshore wind farms increases, various diseases gradually appear. The main disease is the scouring of the seabed near the bottom of the piles, forming scouring pits that endanger the safety of the wind turbine piles. Some of the wind turbine piles themselves also have rust problems. As time goes by, it will inevitably endanger the structural safety of the wind turbine piles and make them unable to support the upper wind turbine structure.

[0003] The existing maintenance and reinforcement methods are mainly aimed at the problem of foundation scour. There is no mature and reliable method for reinforcing the structure of the wind turbine pile itself. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines.

[0005] The construction method of the large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines includes the following construction steps:

[0006] Step 1: Use a floating support platform or a hoop support platform as the support system conversion platform;

[0007] Step 2: Drive anchor steel pipe piles into the seabed along the wind turbine pipe piles on the support system conversion platform, and fix the prestressed traction reinforcement to the top of the anchor steel pipe piles;

[0008] Step 3: Remove the bolts of the fan support and the fan pile, and use the hydraulic struts on the floating support platform or the hydraulic jack on the clamp support platform to move the fan support;

[0009] Step 4: Hang the built-in rigid reinforcement steel frame into the fan pile, set a docking flange on the top, and pour micro-expansion concrete into the fan pile through a pouring ring;

[0010] Step 5: Anchor the prestressed traction reinforcement to the second lifting ring on the top of the wind turbine pile, and tension the prestressed traction reinforcement;

[0011] Step 6: Connect the fan pillars and fan piles on the support system conversion platform.

[0012] Preferably, in step one, the floating support platform includes a floating platform, a support clamp, a movable clamp and a hydraulic strut; the support clamp and the movable clamp are respectively installed on the floating platform through the hydraulic strut, and a steel pontoon is provided under the floating platform; the floating support platform installation step is to use a tugboat to tow the floating platform to the wind turbine pile, the floating platform is provided with a U-shaped opening, the wind turbine pile passes through the floating platform through the U-shaped opening, the U-shaped opening is closed by a connecting rod, and then the movable clamp is clamped on the wind turbine pile, the support clamp is clamped on the wind turbine pillar, the four corners of the floating platform are connected to the anchor by a traction rope, and the anchor is sunk on the seabed.

[0013] Preferably, in step one, the clamp support platform includes a lower support clamp, an upper support clamp, a steel bracket, a movable track, a hydraulic jack and a support pulley, the steel bracket is fixed on the lower support clamp, the hydraulic jack is fixed on the upper support clamp, and the support pulley is fixed on the lower end of the hydraulic jack; the clamp support platform installation steps are: install the lower support clamp on the wind turbine pipe pile, and install the distribution beam and the movable track on the steel bracket of the lower support clamp, and then install the upper support clamp on the wind turbine pillar, and support the support pulley on the movable track, and then add segment support clamps at the ends of the upper support clamp and the lower support clamp.

[0014] Preferably, in step two, the anchoring steel pipe pile is driven in by means of an auxiliary driving steel pipe, a lifting ring is provided on the top of the steel cage of the anchoring steel pipe pile, and a socket-type docking port is provided between the anchoring steel pipe pile and the auxiliary driving steel pipe. After the anchoring steel pipe pile is driven into the designed depth, one end of the prestressed traction bar is fixed to the lifting ring, and a float is tied to the other end of the prestressed traction bar. Then, the steel cage is lowered into the anchoring steel pipe pile through the auxiliary driving steel pipe, and concrete is poured, and then the auxiliary driving steel pipe is pulled out.

[0015] Preferably, in step three, a floating support platform separation method is adopted: the bolts between the fan pillar and the fan pipe pile are removed, the hydraulic support rods on the support clamp are controlled to lift the fan pillar upward as a whole, and the hydraulic support rods on the movable clamp are controlled to make the floating platform translate as a whole relative to the fan pipe pile, so that the fan pillar is separated from the fan pipe pile; then an adjustable pad is arranged on the floating platform under the fan pipe pile, the adjustable pad includes a lower base and an upper support, the upper support and the lower base are connected by a screw, the height of the upper support is adjusted, and a U-shaped pad is placed under the upper support, and the fan pillar is placed on the upper support.

[0016] Preferably, in step three, a clamp support platform separation method is adopted: the bolts between the fan pillar and the fan pipe pile are removed, the hydraulic jack on the upper support clamp is controlled to lift the fan pillar upward as a whole, and then the fan pillar is moved laterally from the fan pipe pile along the moving track. During the lateral movement of the fan pillar, a counterweight block is placed at the other end of the steel support to balance the load of the fan pillar.

[0017] Preferably, in step four, the built-in rigid reinforcement steel frame includes a cross-shaped steel, a casting ring, a docking flange and a wedge-shaped guide block, the docking flange is fixed on the top of the cross-shaped steel, the wedge-shaped guide block is arranged along the circumference of the casting ring, and a lifting ring 2 is provided at the bottom of the docking flange; in step five, the prestressed traction reinforcement is anchored on the lifting ring 2 below the docking flange at the top of the wind turbine pile.

[0018] Preferably, in step six, the floating support platform is docked in the following manner: the hydraulic struts on the support clamps are controlled to lift the fan pillars from the adjustable pads, and then the hydraulic struts on the movable clamps are controlled to align the fan pillars with the docking flanges of the fan pipe piles, and then the fan pillars are connected and fixed to the fan pipe piles with bolts, and finally the support clamps and the movable clamps are removed, and the floating support platform is towed and removed.

[0019] Preferably, in step six, the clamp support platform docking method is: move the fan pillar horizontally along the moving track, move it to the top of the fan pipe pile, remove the counterweight blocks one by one, and then control the hydraulic jack to lower the fan pillar and dock it with the docking flange of the fan pipe pile, and then use bolts to connect and fix the fan pillar to the fan pipe pile, and finally remove the upper support clamp, lower support clamp and segment support clamp.

[0020] The large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines is obtained by any of the above-mentioned methods.

[0021] The beneficial effects of the present invention are:

[0022] 1) The present invention proposes two support system conversion platforms: a floating support platform and a clamp support platform. Different working platforms can be flexibly selected according to the depth of the sea water. Both working platforms can provide stable and reliable support for the wind turbine pillars to ensure the smooth implementation of the reinforcement operation.

[0023] 2) The wind turbine pipe pile of the present invention has a built-in rigid reinforcement steel frame, which can reinforce the damaged wind turbine pipe pile. The micro-expansive concrete poured inside can prevent the corrosion of the rigid steel frame, improve the integrity of the rigid steel bar and the wind turbine pipe pile, and ensure the bearing capacity of the structure.

[0024] 3) In the present invention, anchor steel pipe piles are driven into the seabed around the wind turbine pipe piles, and the wind turbine pipe piles are tensioned and anchored by prestressed traction bars to improve the stability of the wind turbine pipe piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the process flow chart of the combined reinforcement construction of prestressed steel pipe piles and solidified soil for offshore wind turbines

[0026] Figure 2 It is a schematic diagram of the operation of the floating support platform;

[0027] Figure 3 This is a top view of the floating support platform operation;

[0028] Figure 4 This is a schematic diagram of the operation of the floating support platform after the wind turbine pillars are separated;

[0029] Figure 5 This is a top view of the floating support platform after the wind turbine pillars are separated;

[0030] Figure 6 It is a schematic diagram of the construction of the built-in rigid reinforcement structure;

[0031] Figure 7 This is a schematic diagram of fan support reset;

[0032] Figure 8 It is a schematic diagram of the prestressed core-solidified soil combined protection structure;

[0033] Fig. 9 It is a schematic diagram of the support hoop structure;

[0034] Fig.10 It is a schematic diagram of the movable hoop structure;

[0035] Fig.11 It is a schematic diagram of the three-dimensional structure of the adjustable pad;

[0036] Fig.12 yes Fig.11 AA section view of the adjustable spacer block;

[0037] Fig.13 It is a schematic diagram of the U-shaped pad structure;

[0038] Fig.14 It is a schematic diagram of the built-in rigid reinforcement steel frame;

[0039] Fig.15 Schematic diagram of hoop support platform operation;

[0040] Fig.16 This is a schematic diagram of the operation of the hoop support platform after the fan support is separated;

[0041] Fig.17 This is a schematic diagram of the hoop support platform operation after the built-in rigid reinforcement structure is installed;

[0042] Fig.18 This is a schematic diagram of the segment friction-increasing clamp structure;

[0043] Fig.19 It is a schematic diagram that the upper support clamp is provided with a hydraulic jack and a support pulley.

[0044] Markings in the figure: 11-wind turbine pillar, 12-wind turbine pile, 13-seabed, 14-scouring pit, 21-floating platform, 22-steel pontoon, 24-anchor, 23-traction rope, 25-U-shaped opening, 26-connecting rod, 27-support clamp, 28-movable clamp, 29-friction-enhancing rubber cushion, 210-vertical guide pulley, 211-horizontal guide pulley, 212-hydraulic support rod, 31-auxiliary steel pipe insertion, 32-anchor steel pipe pile, 33-reinforcement cage, 34-prestressed traction bar, 35-lifting ring one, 36-floating ball, 37-solidified soil, 41-cross steel, 42-casting ring, 43-jointing flange, 44-wedge-shaped guide block, 45-lifting ring two, 5-adjustable pad, 51-lower base, 52-upper support, 53-screw, 54-U-shaped pad, 61-lower support hoop, 62-upper support hoop, 63-segment support hoop, 64-steel bracket, 65-distribution beam, 66-movable track, 67-hydraulic jack, 68-support pulley, 69-counterweight. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0046] Embodiment 1

[0047] As an embodiment, in view of the existing problems of damage to large-diameter offshore wind turbine pipe piles, this embodiment 1 proposes a construction method for a prestressed core-solidified soil combined reinforcement system for large-diameter steel pipe piles for offshore wind turbines, which effectively solves the problem of reduced bearing capacity caused by damage to wind turbine pipe piles and ensures stable and reliable operation of the wind turbines thereon. Figure 1 As shown, the construction method of the large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines includes the following construction steps:

[0048] Step 1: Install the support system conversion platform. Select a reasonable support system conversion platform according to the water depth of the sea area. When the water level is deep, use a floating support platform. When the water level is shallow, use a clamp support platform.

[0049] Step 2: Figures 2 to 8As shown, anchoring steel pipe piles 32 are constructed and solidified soil 37 is poured: on a floating support platform or a clamp support platform, anchoring steel pipe piles 32 are driven into the seabed 13 along the circumference of the wind turbine pipe piles 12, and the anchoring steel pipe piles 32 are driven in through auxiliary driving steel pipes 31. A socket-type docking interface is provided between the anchoring steel pipe piles 32 and the auxiliary driving steel pipes 31. After the anchoring steel pipe piles 31 are driven into the designed depth, one end of the prestressed traction reinforcement 34 is fastened to a lifting ring 35 on the steel cage 33, and a floating ball 36 is tied to the other end of the prestressed traction reinforcement 34, and then the steel cage 33 is lowered into the anchoring steel pipe pile 32 through the auxiliary driving steel pipe 31, and concrete is poured, and then the auxiliary driving steel pipe 31 is pulled out.

[0050] Step 3, separating the fan pillar 11 from the fan pipe pile 12: There are two ways to separate the fan pillar 11 from the fan pipe pile 12, one is to use a floating support platform, and the other is to use a clamp support platform.

[0051] Step 4: Installation of the internal rigid reinforcement steel frame: After the fan pillar 11 is removed from the fan pipe pile 12, the internal rigid reinforcement steel frame is hoisted into the fan pipe pile 12, and micro-expansion concrete is poured into the fan pipe pile 12 through the pouring ring 42 thereon.

[0052] Step 5, tensioning the prestressed traction bar 34: After the micro-expansion concrete in the fan pile 12 is poured, the float 36 is removed from the prestressed traction bar 34, the prestressed traction bar 34 is anchored on the second lifting ring 45 under the docking flange 43, and the prestressed traction bar 34 is tensioned.

[0053] Step 6. Butt joint the fan pillar 11 with the fan pipe pile 12: After the micro-expansive concrete reaches the designed strength, butt joint the fan pillar 11 with the fan pipe pile 12.

[0054] Embodiment 2

[0055] As another embodiment, this embodiment 2 proposes, on the basis of the embodiment 1, a more specific construction method of a large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines, when a floating support platform is selected:

[0056] In step one, if Figure 2 and Figure 3 As shown, a tugboat is used to tow the floating support platform to the wind turbine pile 12, and the wind turbine pile 12 is passed through the floating platform 21 through the U-shaped opening 25, and the U-shaped opening 25 is closed using a connecting rod 26, and then the movable clamp 28 is clamped on the wind turbine pile 12, and the support clamp 27 is clamped on the wind turbine support 11.

[0057] In step three, if Figure 4 and Figure 5As shown, the bolts of the fan pillar 11 and the fan pipe pile 12 are removed, the hydraulic strut 212 on the support clamp 27 is controlled to lift the fan pillar 11 upward as a whole, and the hydraulic strut 212 on the movable clamp 28 is controlled to make the floating platform 21 translate as a whole relative to the fan pipe pile 12, so that the fan pillar 11 is separated from the fan pipe pile 12; then, an adjustable cushion block 5 is set on the floating platform 21 under the fan pipe pile 12, the height of the upper support 52 is adjusted, and a U-shaped cushion block 54 is placed under the upper support 52, and the fan pillar 11 is placed on the upper support 52.

[0058] In step six, if Figure 6 and Figure 7 As shown, the hydraulic strut 212 on the support clamp 27 is controlled to prop up the fan pillar 11 from the adjustable pad 5, and then the hydraulic strut 212 on the movable clamp 28 is controlled to align the fan pillar 11 with the fan pipe pile 12, and then the fan pillar 11 is lowered to fall on the docking flange 43, and then the fan pillar 11 and the fan pipe pile 12 are connected and fixed with bolts, and finally the support clamp 27 and the movable clamp 28 are removed from the fan pipe pile 12 and the fan pillar 11, and the floating support platform is towed and removed.

[0059] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0060] Embodiment 3

[0061] As another embodiment, this embodiment 3 proposes, on the basis of embodiments 1 and 2, a more specific construction method of a large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines, when a hoop support platform is selected:

[0062] In step 1, the lower support hoop 61 is installed on the fan pile 12, and the distribution beam 65 and the movable track 66 are installed on the steel bracket 64 of the lower support hoop 61. Then, the upper support hoop 62 is installed on the fan pillar 11, and the support pulley 68 is supported on the movable track 66. Then, the segment support hoop 63 is added to the ends of the upper support hoop 62 and the lower support hoop 61.

[0063] In step three, if Figures 15 to 17 As shown, the bolts of the fan pillar 11 and the fan pipe pile 12 are removed, and the hydraulic jack 67 on the upper support hoop 62 is controlled to lift the fan pillar 11 upward as a whole, and then the fan pillar 11 is moved laterally from the fan pipe pile 12 along the movable track 66. During the lateral movement of the fan pillar 11, a counterweight block 69 is placed at the other end of the steel support 64 to balance the load of the fan pillar 11.

[0064] In step six, the fan pillar 11 is moved horizontally along the movable track 66 to the top of the fan pipe pile 12, and the counterweight blocks 69 are removed piece by piece. Then, the hydraulic jack 67 is controlled to slowly lower the fan pillar 11 so that it falls on the docking flange 43. Then, the fan pillar 11 is connected and fixed to the fan pipe pile 12 with bolts. Finally, the upper support hoop 62, the lower support hoop 61, the segment support hoop 63 and other components are removed from the fan pipe pile 12 and the fan pillar 11.

[0065] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 and 2 can be referenced to each other and will not be described in detail in this application.

[0066] Embodiment 4

[0067] As another embodiment, this embodiment 4 is proposed on the basis of embodiments 1 to 3, and the offshore wind turbine large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system obtained by this method includes: a support system conversion platform, anchor steel pipe piles 32, prestressed traction bars 34, solidified soil 37, and a built-in rigid reinforcement steel frame.

[0068] The support system conversion platform includes a floating support platform and a clamp support platform. The floating support platform is used in the sea area with a deeper water level, and the clamp support platform is used in the sea area with a shallower water level. The anchor steel pipe pile 32 is inserted along the side of the wind turbine pipe pile 12, and the internal rigid reinforcement steel frame is set in the wind turbine pipe pile 12. Figure 8 and Fig.14 As shown, both ends of the prestressed traction bar 34 are anchored to the anchor steel pipe pile 32 and the built-in rigid reinforcement steel frame respectively, and the solidified soil 37 is poured in the scouring pit 14 of the seabed 13 around the wind turbine pipe pile 12; a steel cage 33 is arranged in the anchor steel pipe pile 32 and poured with concrete, and a lifting ring 35 is arranged on the top of the steel cage 33; the built-in rigid reinforcement steel frame includes a cross-shaped steel 41, a casting ring 42, a docking flange 43, a wedge-shaped guide block 44 and other components, the docking flange 43 is fixed on the top of the cross-shaped steel 41, the casting ring 42 is fixed on the middle of the docking flange 43, the wedge-shaped guide blocks 44 are evenly arranged along the circumference of the casting ring 42, and a lifting ring 2 45 is arranged on the lower part of the docking flange 43.

[0069] The floating support platform includes a floating platform 21, a support hoop 27, a movable hoop 28, a hydraulic strut 212 and other components; the support hoop 27 and the movable hoop 28 are installed on the floating platform 21 through the hydraulic strut 212, the support hoop 27 is clamped on the fan support 11, and the movable hoop 28 is clamped on the fan pipe pile 12.

[0070] The clamp support platform includes a lower support clamp 61, an upper support clamp 62, a steel bracket 64, a movable track 66, a hydraulic jack 67, a support pulley 68 and other components. The upper support clamp 62 is clamped on the fan pillar 11, the lower support clamp 61 is clamped on the fan pipe pile 12, the steel bracket 64 is fixed on the lower support clamp 61, the movable track 66 is supported on the steel bracket 64, the hydraulic jack 67 is fixed on the upper support clamp 62, and the support pulley 68 is fixed on the lower end of the hydraulic jack 67 and supported on the movable track 66. By setting up a floating support platform and a clamp support platform, it is convenient to remove and reinstall the fan pillar 11 from the fan pipe pile 12, and the conversion of the structural system can be completed quickly.

[0071] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 to 3 can be referenced to each other and will not be described in detail in this application.

[0072] Embodiment 5

[0073] As another embodiment, this embodiment 5 proposes, on the basis of embodiments 1 to 4, a more specific offshore wind turbine large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system:

[0074] A steel pontoon 22 is provided below the floating platform 21 , and traction ropes 23 and anchors 24 are provided at the four corners of the floating platform 21 , respectively. The anchors 24 are sunk on the seabed 13 , and the stability of the floating platform 21 is ensured by providing the anchors 24 and traction ropes 23 .

[0075] The upper end of the upper support hoop 62 and the lower end of the lower support hoop 61 are respectively provided with segment support hoops 63. Multiple segment support hoops 63 can be provided according to the on-site conditions. By providing the segment support hoops 63, the bearing capacity of the upper support hoop 62 and the lower support hoop 61 is improved.

[0076] like Fig. 9 and Fig.19 As shown, the inner sides of the support hoop 27, the upper support hoop 62, the lower support hoop 61 and the segment support hoop 63 are all provided with a friction-increasing rubber pad 29 to increase the friction of the hoop and avoid slipping; the inner side of the movable hoop 28 is provided with a vertical guide pulley 210 and a horizontal guide pulley 211 to ensure that the movable hoop 28 can slide up and down and rotate circumferentially relative to the wind turbine pile 12.

[0077] The floating platform 21 is provided with a U-shaped opening 25 , and the wind turbine pile 12 passes through the U-shaped opening 25 from the middle of the floating platform 21 . A connecting rod 26 is provided at the U-shaped opening 25 to improve the overall stability of the floating platform 21 and prevent the floating platform 21 from being disconnected from the U-shaped opening 25 .

[0078] A distribution beam 65 is provided between the steel support 64 and the movable track 66. The distribution beam 65 is provided to evenly transfer the load on the movable track 66 to the steel support 64, thereby avoiding stress concentration.

[0079] The steel support 64 is provided with a counterweight block 69 , and the load of the fan support 11 is balanced by providing the counterweight block 69 to avoid eccentricity.

[0080] like Fig.11 and Fig.12 As shown, the floating platform 21 is provided with an adjustable pad 5, and the fan pillar 11 is supported on the adjustable pad 5. The adjustable pad 5 includes a lower base 51, an upper support 52, a screw 53 and a U-shaped pad 54. The upper support 52 and the lower base 51 are connected by the screw 53, and a U-shaped pad 54 is provided between the lower base 51 and the upper support 52. By setting the adjustable pad 5, a stable and reliable temporary support is provided for the fan pillar 11.

[0081] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 to 4 can be referenced to each other and will not be described in detail in this application.

[0082] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for a large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines, characterized in that: The construction steps include: Step 1, select a floating support platform or a clamp support platform as the support system conversion platform; the floating support platform includes a floating platform, a support clamp, a movable clamp and a hydraulic strut; the support clamp and the movable clamp are respectively installed on the floating platform through the hydraulic strut, and a steel pontoon is provided under the floating platform; the installation steps of the floating support platform are to use a tugboat to tow the floating platform to the wind turbine pile, the floating platform is provided with a U-shaped opening, the wind turbine pile passes through the floating platform through the U-shaped opening, the U-shaped opening is closed with a connecting rod, and then the movable clamp is clamped on the wind turbine pile, the support clamp is clamped on the wind turbine pillar, and the four corners of the floating platform are respectively clamped by The traction rope is connected to the anchor, and the anchor is sunk on the seabed; the hoop support platform includes a lower support hoop, an upper support hoop, a steel bracket, a mobile track, a hydraulic jack and a support pulley, the steel bracket is fixed to the lower support hoop, the hydraulic jack is fixed to the upper support hoop, and the support pulley is fixed to the lower end of the hydraulic jack; the installation steps of the hoop support platform are as follows: the lower support hoop is installed on the wind turbine pile, and the distribution beam and the mobile track are installed on the steel bracket of the lower support hoop, and then the upper support hoop is installed on the wind turbine pillar, and the support pulley is supported on the mobile track, and then segment support hoops are added at the ends of the upper support hoop and the lower support hoop; Step 2: Drive anchor steel pipe piles into the seabed along the wind turbine pipe piles on the support system conversion platform, and fix the prestressed traction reinforcement to the top of the anchor steel pipe piles; Step 3: Remove the bolts of the fan support and the fan pile, and use the hydraulic struts on the floating support platform or the hydraulic jack on the clamp support platform to move the fan support; Step 4: Hang the built-in rigid reinforcement steel frame into the fan pile, set a docking flange on the top, and pour micro-expansion concrete into the fan pile through a pouring ring; Step 5: Anchor the prestressed traction reinforcement to the second lifting ring on the top of the wind turbine pile, and tension the prestressed traction reinforcement; Step 6: Connect the fan pillars and fan piles on the support system conversion platform.

2. The construction method of the large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines according to claim 1 is characterized in that: In step two, the anchor steel pipe pile is driven in through the auxiliary driving steel pipe. A lifting ring is provided on the top of the steel cage of the anchor steel pipe pile. A socket-type docking port is provided between the anchor steel pipe pile and the auxiliary driving steel pipe. After the anchor steel pipe pile is driven into the designed depth, one end of the prestressed traction bar is fixed to the lifting ring, and a float is tied to the other end of the prestressed traction bar. Then, the steel cage is lowered into the anchor steel pipe pile through the auxiliary driving steel pipe, and concrete is poured, and then the auxiliary driving steel pipe is pulled out.

3. The construction method of the large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines according to claim 1 is characterized in that: In step three, a floating support platform separation method is adopted: the bolts between the fan pillar and the fan pipe pile are removed, the hydraulic support rods on the support clamp are controlled to lift the fan pillar upward as a whole, and the hydraulic support rods on the movable clamp are controlled to make the floating platform translate as a whole relative to the fan pipe pile, so that the fan pillar is separated from the fan pipe pile; then an adjustable pad is set on the floating platform under the fan pipe pile, and the adjustable pad includes a lower base and an upper support. The upper support and the lower base are connected by a screw, the height of the upper support is adjusted, and a U-shaped pad is placed under the upper support to place the fan pillar on the upper support.

4. The construction method of the large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines according to claim 1 is characterized in that: In step three, the support platform is separated by a clamp: the bolts between the fan pillar and the fan pipe pile are removed, the hydraulic jack on the upper support clamp is controlled to lift the fan pillar upward as a whole, and then the fan pillar is moved laterally from the fan pipe pile along the moving track. During the lateral movement of the fan pillar, a counterweight is placed at the other end of the steel support to balance the load of the fan pillar.

5. The construction method of the large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines according to claim 1 is characterized in that: In step 4, the built-in rigid reinforcement steel frame includes a cross-shaped steel, a casting ring, a docking flange and a wedge-shaped guide block. The docking flange is fixed on the top of the cross-shaped steel, the wedge-shaped guide block is arranged along the circumference of the casting ring, and a lifting ring 2 is provided at the bottom of the docking flange; in step 5, the prestressed traction reinforcement is anchored on the lifting ring 2 below the docking flange at the top of the wind turbine pile.

6. The construction method of the large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines according to claim 1 is characterized in that: In step six, the floating support platform docking method is: control the hydraulic struts on the support clamp to prop up the fan pillar from the adjustable pad, then control the hydraulic struts on the movable clamp to align the fan pillar with the docking flange of the fan pipe pile, then use bolts to connect and fix the fan pillar to the fan pipe pile, finally remove the support clamp and the movable clamp, and tow and remove the floating support platform.

7. The construction method of the large-diameter steel pipe pile prestressed core-solidified soil combined reinforcement system for offshore wind turbines according to claim 1 is characterized in that: In step six, the method of docking the clamp support platform is as follows: move the fan pillar horizontally along the moving track, move it to the top of the fan pipe pile, remove the counterweight blocks one by one, and then control the hydraulic jack to lower the fan pillar and dock it with the docking flange of the fan pipe pile, and then use bolts to connect and fix the fan pillar to the fan pipe pile, and finally remove the upper support clamp, lower support clamp and segment support clamp.

8. Offshore wind turbine large diameter steel pipe pile prestressed core-solidified soil combined reinforcement system, characterized in that: Obtained by the method according to any one of claims 1 to 7.

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