Construction structure and method suitable for building and transporting offshore wind turbine cylindrical foundation on semi-submersible barge

Abstract

The present invention relates to a construction structure and method suitable for building and transporting offshore wind power cylindrical foundations on semi-submersible barges. The present invention welds scaffolding and performs cylindrical skirt construction on the semi-submersible barge by berthing the semi-submersible barge at the dock, sinks the semi-submersible barge to lower the working height, suspends the base plate for foundation Bailey frame construction, supports the transition section construction, welds the buoyancy box to the foundation cylindrical skirt and fixes it to the semi-submersible barge, transports the foundation as a whole to the construction site, floats the foundation with air and separates it from the semi-submersible barge, and sinks the foundation under negative pressure to perform self-weight sinking and negative pressure sinking construction. The disadvantages of traditional cylindrical foundations such as high difficulty in manufacturing, high transportation cost, high risk of sinking and installation, large-tonnage gantry crane overturning, need to dismantle the tire frame, and poor stability during floating transportation are solved, and the integrated manufacturing, transportation and installation process of the cylindrical foundation of offshore wind turbines is realized, which saves manufacturing site and lifting costs, eliminates the construction period of foundation overturning, realizes the reuse of scaffolding and buoyancy box, and improves the stability of foundation transportation and sinking construction.

Description

Technical Field

[0001] The invention relates to an offshore wind turbine cylindrical foundation, and in particular to a construction structure and method suitable for constructing and transporting an offshore wind turbine cylindrical foundation on a semi-submersible barge. Background Art

[0002] There are significant differences between the barrel foundation structure and the traditional barrel foundation in terms of material application, structural form and bearing characteristics. The compartment design with a diameter greater than 30m effectively improves the anti-tilting bearing capacity of the soft foundation, but the manufacturing and transportation of the traditional suction composite barrel foundation still has the following disadvantages:

[0003] (1) The construction of a barrel foundation requires a sufficiently large dock site with a water depth of at least 8m. The construction and pouring of a barrel foundation takes at least 2 months, and the rental cost is quite expensive in southern cities such as Guangdong and Fujian.

[0004] (2) At present, most of the methods for launching barrel foundations use modular vehicles to push the foundation along the track to the shore, and then use a 5,000-ton gantry crane to lift it into the water. The cost of purchasing modular vehicles to lay tracks and building a 5,000-ton gantry crane is very high;

[0005] (3) The barrel foundation occupies a large area, is heavy, and has a tall structure. It is difficult to float or wet-tow it. The separation and sinking installation of the barrel requires a 5,000-ton floating crane, which places very high demands on the underwater construction accuracy. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a construction structure and method suitable for building and transporting offshore wind turbine cylindrical foundations on a semi-submersible barge, realizing the integrated manufacturing, transportation and installation process of offshore wind turbine cylindrical foundations.

[0007] The technical solution adopted by the present invention is: a construction structure suitable for building a cylindrical foundation for transporting offshore wind power on a semi-submersible barge, characterized in that it includes a cylindrical foundation, a semi-submersible barge and an anchor machine, the cylindrical foundation includes a transition section, a bottom plate and a cylindrical skirt, the semi-submersible barge is berthed at a pier and anchored, the cylindrical skirt is assembled and cast on the semi-submersible barge, and the support welding of the bottom structure of the bottom steel plate is performed; the semi-submersible barge sinks to the seabed surface, so that the bottom steel plate is exposed above the water surface, the bottom plate is cast on the bottom steel plate, and then the transition section is cast on the concrete bottom plate;

[0008] The skirt is evenly distributed with buoys around it, and the buoys are connected to the deck shackles on the semi-submersible barge through steel wire ropes, and then connected to the anchor windlass; the bottom plate is connected to the anchor windlass through steel wire ropes;

[0009] The semi-submersible barge transports the cylindrical foundation to the designated position, the semi-submersible barge sinks, reverses the anchor machine connected to the pontoon, loosens the wire rope connected to the pontoon, inflates the cylindrical foundation to float, replaces the anchor machine connected to the pontoon with an anchor boat; reverses the anchor machine connected to the bottom plate, loosens the wire rope connected to the bottom plate, and the semi-submersible barge moves away from the position;

[0010] The anchor boat is tightened and positioned under force, the cylindrical foundation is de-aired and sinks to the bottom to contact the seabed surface, the buoyancy box is filled with water and sinks, and the buoyancy box is released; each compartment of the cylindrical foundation continues to sink to the designed elevation by pumping water and air.

[0011] A construction method for a cylindrical foundation for offshore wind power generation constructed on a semi-submersible barge, characterized in that it comprises the following steps:

[0012] a. Tube skirt construction: The semi-submersible barge is berthed at the wharf and anchored, and the tube skirt is assembled and cast on the semi-submersible barge. After completion, the support welding of the bottom structure of the bottom steel plate is carried out; when assembling and casting the tube skirt, a double-row scaffold is set up outside and a full-height scaffold is set up inside as a construction operation platform, and the steel plate at the bottom of the scaffold is welded and fixed to the deck;

[0013] b. Construction of foundation slab: The bottom of the semi-submersible barge sinks to expose the bottom steel plate to the water surface. First, tie the bottom plate and the upper beam reinforcement. Then pour the concrete bottom plate on the bottom steel plate. Finally, support the formwork and pour the upper beam concrete and part of the transition section.

[0014] c. Construction of foundation transition section: Steel formwork is used as support inside and outside the transition section construction warehouse wall, and a full-height scaffolding is set up inside as a support and operation platform. The internal formwork is fully installed, and a single-row scaffolding is used as a platform outside, and the formwork is constructed layer by layer;

[0015] d. Suspension pontoons: The pontoons are transported by semi-submersible barges to the vicinity of the barrel foundation, and the pontoons are evenly distributed on the barrel skirt wall. The pontoons are inflated and drained to float up. The pontoons are connected and tied by steel wire ropes so that the pontoons embrace the barrel skirt to prevent the pontoons from shaking. The pontoons are connected to the deck shackles by steel wire ropes and then to the anchor windlass. The bottom plate is connected to the anchor windlass by steel wire ropes.

[0016] e. Floating and separation of foundation: After the cylindrical foundation is transported to the designated position by the semi-submersible barge, the semi-submersible barge sinks; the anchor winch is reversed, the wire rope connected to the buoyancy box is loosened, the cylindrical foundation is inflated and begins to float, and after the scaffolding is separated from the height of the barrel skirt, the air pressure in each cabin of the foundation is adjusted to make the cylindrical foundation suspended and balanced, and the bottom hook on one side of the semi-submersible barge is removed and replaced with the anchor hook point for easy positioning; the anchor winch is reversed, the wire rope connected to the bottom plate is loosened, and the top hook of the foundation bottom plate is removed, and the semi-submersible barge is moved away from the position;

[0017] f. Foundation sinking: The bottom hook is tightened and positioned by anchoring the boat, the cylinder foundation is de-aired and starts to sink until the bottom contacts the seabed, the pontoon is filled with water and sinks, and the pontoon is removed; each compartment of the cylinder foundation continues to sink to the designed elevation by pumping water and air, and the installation of the cylinder foundation is completed.

[0018] Preferably, in step a, the outer cylinder wall and compartment plates of the cylinder foundation are welded and assembled in sections every 2 m on the semi-submersible barge, and the inner concrete of the outer cylinder wall is poured in layers every 2 m to a height of 8 meters; the bottom of the scaffolding is welded on the deck and does not need to be removed from the semi-submersible barge.

[0019] Preferably, in step d, the size of the pontoon is 15×12×2m.

[0020] Preferably, in step d, one pontoon is arranged on each side of the tube skirt, with a total of six pontoons.

[0021] Preferably, in step d, a lifting lug is provided on the lower side of the buoyancy box, and the anchor winch passes through the deck shackle through a steel wire rope and connects the bottom hook to hang the lifting lug.

[0022] Preferably, in step d, a lifting lug is provided on the bottom plate, and the anchor machine is connected to the top hook via a steel wire rope to hang the lifting lug.

[0023] Preferably, in step d, rubber pads are filled between the pontoon and the tube skirt, with a filling thickness of 20 cm and a filling height equal to the concrete pouring height, to prevent the outer tube wall from colliding with the edge.

[0024] Preferably, in step e, the draft of the cylindrical foundation is 6m during floating, and the air pressure in each compartment of the cylindrical foundation is monitored and adjusted to maintain at 35kpa, while the force on the bottom hook is controlled within the range of 600 to 1200 tons.

[0025] Preferably, in step e, the bottom hook wire rope is loosened, the cylindrical foundation is inflated to 50 kPa and begins to float, and then the air pressure in each compartment of the cylindrical foundation is adjusted to maintain 35 kPa, so that the cylindrical foundation is suspended and balanced, and the two bottom hooks on the side of the semi-submersible barge are removed, and the hook points of the two anchor boats are connected for cross positioning.

[0026] The beneficial effects achieved by the present invention are: solving the disadvantages of traditional barrel foundations, such as great difficulty in onshore manufacturing, high cost of wet-towed transportation, great risk of sinking and installation, large-tonnage gantry crane barging, need to dismantle the tire frame, and poor stability during floating transportation, and realizing the integrated manufacturing, transportation and installation process of the barrel foundation of offshore wind turbines, saving manufacturing site and lifting costs, eliminating the construction period of foundation barging, realizing the reuse of scaffolding and pontoon, and improving the stability of the barrel foundation transportation and sinking construction. Compared with the composite barrel foundation manufactured on land, it can reduce the comprehensive cost by 10% to 25%, shorten the manufacturing and transportation period, has good economy, and is conducive to promotion and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1This is a schematic diagram of pouring concrete for the transition section of the semi-submersible barge according to the present invention;

[0028] Figure 2 It is a schematic plan view of the suspension position of the buoyancy box and the bottom plate hook when the semi-submersible barge transports the cylindrical foundation of the present invention;

[0029] Figure 3 It is a schematic elevation view of the suspension position of the buoyancy box and the bottom plate hook when the semi-submersible barge transports the barrel-shaped foundation of the present invention;

[0030] Figure 4 It is a schematic plan view of the semi-submersible barge and the anchor boat restricting the movement of the cylindrical foundation when the cylindrical foundation sinks under negative pressure according to the present invention;

[0031] Figure numerals: 1. transition section; 2. bottom plate; 3. tube skirt; 4. scaffolding; 5. semi-submersible barge; 6. pump truck; 7. seabed surface; 8. anchor windlass; 9. wire rope; 10. deck shackle; 11. lifting lug; 12. buoyancy box; 13. rubber pad; 14. anchor boat. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] like Figure 1-4 As shown, a construction structure suitable for building a cylindrical foundation for transporting offshore wind power on a semi-submersible barge is characterized in that it includes a cylindrical foundation, a semi-submersible barge 5 and an anchor windlass 8, the cylindrical foundation includes a transition section 1, a bottom plate 2 (a polygonal structure of bottom steel-wrapped concrete) and a tube skirt 3 (a steel-wrapped concrete structure), the semi-submersible barge 5 is berthed at the dock and anchored, the tube skirt 3 is assembled and cast on the semi-submersible barge 5, and the support welding of the bottom structure of the bottom steel plate is performed; the semi-submersible barge 5 sinks to the seabed surface 7, so that the bottom steel plate is exposed above the water surface, the bottom plate 2 is cast on the bottom steel plate, and then the transition section 1 is cast on the concrete bottom plate 2; buoyancy boxes 12 are evenly distributed around the tube skirt 3, and the buoyancy boxes 12 are connected to the deck buckles 10 on the semi-submersible barge 5 through steel wire ropes 9, and then connected to the anchor windlass 8; the bottom plate 2 is connected to the anchor windlass 8 through steel wire ropes 9;

[0034] The semi-submersible barge 5 transports the cylindrical foundation to the designated position, the semi-submersible barge 5 sinks, the anchor windlass 8 connected to the pontoon 12 is reversed, the steel wire rope 9 connected to the pontoon 12 is loosened, the cylindrical foundation is inflated and floated, the anchor windlass 8 connected to the pontoon 12 is replaced by the anchor boat 14; the anchor windlass 8 connected to the bottom plate 2 is reversed, the steel wire rope 9 connected to the bottom plate 2 is loosened, and the semi-submersible barge 5 moves away from the position;

[0035] The anchor boat 14 is tightened and positioned by the anchor, the cylinder foundation is de-aired and sinks to the bottom to contact the seabed surface 7, the pontoon 12 is filled with water and sinks, and the pontoon 12 is released; each compartment of the cylinder foundation continues to sink to the designed elevation by pumping water and air, and the installation of the cylinder foundation is completed.

[0036] The specific construction process is as follows:

[0037] a. Tube skirt construction: The semi-submersible barge 5 is berthed at the dock and anchored, and the tube skirt 3 is assembled and cast on the semi-submersible barge 5 (the combined modular steel plate produced by the assembly manufacturer and the concrete layer of the outer warehouse wall is cast). After completion, the bottom lattice support welding of the bottom steel plate is carried out; when assembling and casting the tube skirt 3, a double-row scaffolding 4 is set up outside and a full-height scaffolding 4 is set up inside as a construction operation platform; the steel plate at the bottom of the scaffolding 4 is welded and fixed to the deck;

[0038] b. Foundation slab construction: combined with Figure 1 As shown, the semi-submersible barge 5 is seated and sunk to the seabed surface 7, so that the bottom steel plate 2 is exposed above the water surface, and the Bailey frame is used as the bottom support. First, the bottom plate and the upper turn beam steel bars are tied together, and then the concrete bottom plate 2 is poured. After the strength reaches the design removal requirement, the Bailey frame is removed, and finally the formwork is supported and the upper turn beam concrete and part of the transition section 1 are poured using a pump truck 6;

[0039] c. Construction of foundation transition section: Steel formwork is used as support inside and outside the construction warehouse wall of transition section 1, and a full-height buckle scaffolding 4 is set up inside as a support and operation platform. The internal formwork is fully installed, and a single-row scaffolding 4 is used outside as a platform, and the mold is constructed layer by layer;

[0040] d. Suspended pontoon: combined with Figure 2 , Figure 3 As shown, the pontoon 12 is transported by the semi-submersible barge 5 to the vicinity of the cylindrical foundation, and a pontoon 12 is arranged on each of the six cylindrical skirt walls 3. The pontoon 12 is inflated and drained to float up, and the pontoons 12 are connected and tied by steel wire ropes 9 so that the pontoons 12 are connected around the cylindrical foundation; a lifting lug 11 is provided on the outside of the pontoon 12, and the bottom hook is fixedly connected to the deck shackle 10; a lifting lug 11 is provided on the bottom plate 2, and the top hook is connected to the ship's anchor machine 8.

[0041] e. Basic floating and separation: combined Figures 2 to 4 As shown, after being transported to the designated position, the semi-submersible barge 5 sinks; the winch of the reverse anchor windlass 8 loosens the bottom hook wire rope 9, the top hook anchor is tightened, the cylindrical foundation is inflated and begins to float, and after the scaffolding 4 is separated from the height of the cylindrical skirt, the air pressure in each compartment of the cylindrical foundation is adjusted to balance the suspension of the cylindrical foundation, and the bottom hook on one side of the semi-submersible barge 5 is removed and replaced with the hook point of the anchor boat 8 for easy positioning; the winch of the reverse anchor windlass 8 loosens the top hook wire rope 9, the top hook anchor is tightened, and the top hook of the foundation bottom plate 2 is removed, and the semi-submersible barge 5 slowly anchors and moves sideways away from the position;

[0042] f. Foundation sinking: The bottom hook anchor is tightened and positioned by force, the cylinder foundation is degassing and starts to sink until the bottom contacts the seabed surface 7, the pontoon 12 is filled with water and sinks, and the pontoon 12 is released; each compartment of the cylinder foundation continues to sink to the designed elevation by pumping water and air, and the installation of the cylinder foundation is completed.

[0043] Furthermore, in step a, the outer tube wall and the compartment plate of the basic tube skirt 3 are welded and assembled in sections every 2 m on the semi-submersible barge 5, and the concrete inside the outer tube wall is poured in layers of about 2 meters each to a height of 8 meters; the bottom of the scaffolding 4 is welded to the deck and does not need to be removed from the semi-submersible barge 5.

[0044] Further, in step d, the size of the pontoon 12 is 15×12×2m, and one pontoon 12 is arranged on each side of the barrel foundation, requiring a total of 6 pontoons 12; a lifting lug 11 is provided on the lower side of the pontoon 12, and the steel wire rope 9 of the anchor machine 8 passes through the deck shackle 10 to connect the hook and hang the lifting lug 11; rubber pads 13 are filled between the pontoon 12 and the barrel foundation, with a filling thickness of 20 cm and a filling height of the concrete pouring height to prevent the outer barrel wall from colliding with the edge; the pontoons 12 are connected and tied by steel wire ropes 9 to prevent the pontoons 12 from shaking; 4 lifting lugs 11 are provided on the bottom plate 2, and the steel wire rope 9 of the anchor machine 8 is connected to the hook and hangs on the lifting lug 11.

[0045] Furthermore, in step e, the draft of the barrel foundation during floating is about 6m, and the air pressure in each compartment of the barrel foundation is monitored and adjusted to maintain about 35kpa, while the force on the bottom hook is controlled within the range of 600-1200 tons.

[0046] Further, in step e, after being transported to the designated position, the semi-submersible barge 5 sinks 8m until the scaffolding 4 is separated from the tube skirt 3; the bottom hook wire rope 9 is loosened, the tube-type foundation is inflated to about 50kpa and begins to float, and then the air pressure in each compartment of the tube-type foundation is adjusted to maintain about 35kpa so that the tube-type foundation is suspended and balanced, the two bottom hooks on the side of the ship are removed, and the hook points of the anchor machines 8 of the two anchor boats 14 are connected and cross-positioned.

[0047] Furthermore, in step e, the anchor machine 8 lifting point is loosened - foundation exhaust is performed - anchor machine 8 lifting point is loosened, and the operation is cyclically performed. The anchor machine 8 lifting point and foundation exhaust are completed by the automatic control system in cooperation with manual monitoring operations, so that the foundation is suspended and maintained in a balanced state.

[0048] Furthermore, in step f, before the buoyancy box 12 is untied, the hook connecting the anchor machine 8 on the ship is removed, the hook connection with the buoyancy box 12 is untied, and the wire rope 9 of the anchor boat 14 is tightened, so that a row of buoyancy boxes 12 are pulled and unfolded to separate from the tube skirt 3.

[0049] The above shows and describes the basic principles and main structural features of the present invention. The present invention is not limited to the above examples. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cylindrical foundation construction structure suitable for building and transporting offshore wind power on a semi-submersible barge, characterized by: The invention comprises a barrel foundation, a semi-submersible barge (5) and an anchor machine (8), wherein the barrel foundation comprises a transition section (1), a bottom plate (2) and a barrel skirt (3); the semi-submersible barge (5) is moored at a dock and anchored, the barrel skirt (3) is assembled and cast on the semi-submersible barge (5) and the support welding of the bottom structure of the bottom steel plate is performed; the semi-submersible barge (5) is sunk to the seabed surface (7) so that the bottom steel plate is exposed above the water surface, the bottom plate (2) is cast on the bottom steel plate, and then the transition section (1) is cast on the bottom plate (2); The tube skirt (3) is evenly distributed with buoyancy boxes (12) around it, and the buoyancy boxes (12) are connected to the deck shackles (10) on the semi-submersible barge (5) through steel wire ropes (9), and then connected to the anchor windlass (8); the bottom plate (2) is connected to the anchor windlass (8) through steel wire ropes (9); The semi-submersible barge (5) transports the barrel foundation to the designated position, the semi-submersible barge (5) sinks, the anchor windlass (8) connected to the pontoon (12) is reversed, the steel wire rope (9) connected to the pontoon (12) is loosened, the barrel foundation is inflated and floated, the anchor windlass (8) connected to the pontoon (12) is replaced by an anchor boat (14); the anchor windlass (8) connected to the bottom plate (2) is reversed, the steel wire rope (9) connected to the bottom plate (2) is loosened, and the semi-submersible barge (5) moves away from the position; The anchor boat (14) is anchored and tightened to position, the cylindrical foundation is degased and sinks to the bottom to contact the seabed surface (7), the buoyancy box (12) is filled with water and sinks, and the buoyancy box (12) is released; each compartment of the cylindrical foundation continues to sink to the designed elevation by pumping water and air.

2. A construction method for a cylindrical foundation for offshore wind power generation on a semi-submersible barge, characterized in that: The following steps are involved: a. Construction of the tube skirt: the semi-submersible barge (5) is berthed at the pier and anchored, and the tube skirt (3) is assembled and cast on the semi-submersible barge (5). After completion, the support welding of the bottom structure of the bottom steel plate is carried out; when assembling and casting the tube skirt (3), a double-row scaffold is set up outside and a full-height scaffold is set up inside as a construction operation platform, and the steel plate at the bottom of the scaffold is welded and fixed to the deck; b. Construction of the foundation slab: The semi-submersible barge (5) is lowered to expose the bottom steel plate to the water surface. The bottom steel plate is first tied to the steel bars of the upper beam, and then a concrete slab is poured on the bottom steel plate. Finally, the upper beam concrete and part of the transition section (1) are cast in formwork. c. Construction of foundation transition section: (1) During the construction of the transition section, steel formwork is used inside and outside the warehouse wall as support, and a full-height scaffolding is set up inside as support and operating platform. The internal formwork is fully installed, and a single-row scaffolding is used outside as a platform, and the formwork is constructed layer by layer; d. Suspension of pontoons: The pontoons (12) are transported by the semi-submersible barge (5) to the vicinity of the barrel foundation, and the pontoons (12) are evenly distributed on the barrel skirt wall. The pontoons (12) are inflated and drained to float upward, and the pontoons (12) are connected and tied by steel wire ropes (9) so that the pontoons (12) are connected to the barrel skirt (3) to prevent the pontoons (12) from shaking; the pontoons (12) are connected to the deck shackles (10) by steel wire ropes (9) and then connected to the anchor windlass (8); the bottom plate (2) is connected to the anchor windlass (8) by steel wire ropes (9); e. Floating and separating the foundation: After the cylindrical foundation is transported to the designated position by the semi-submersible barge (5), the semi-submersible barge (5) sinks; the anchor winch (8) is reversed to loosen the steel wire rope (9) connected to the buoyancy box (12), the cylindrical foundation is inflated and begins to float, and after the scaffolding is separated from the height of the barrel skirt (8), the air pressure in each cabin of the foundation is adjusted to make the cylindrical foundation suspended and balanced, and the bottom hook on one side of the semi-submersible barge (8) is removed and replaced with the hook point of the anchor boat (14) for easy positioning; the anchor winch (8) is reversed to loosen the steel wire rope (9) connected to the bottom plate (2), and the top hook of the bottom plate (2) is removed, and the semi-submersible barge (5) is moved away from the position; f. Foundation sinking: The bottom hook is tightened and positioned by the anchor boat (14), the cylinder foundation is degassed and begins to sink until the bottom contacts the seabed (7), the buoyancy box (12) is filled with water and sinks, and the buoyancy box (12) is released; each compartment of the cylinder foundation continues to sink to the designed elevation by pumping out water and air, and the installation of the cylinder foundation is completed.

3. The cylindrical foundation construction method for offshore wind power construction and transportation on a semi-submersible barge according to claim 2 is characterized by: In step a, the outer wall of the cylindrical foundation and the compartment plates are welded and assembled in sections every 2 m on the semi-submersible barge (5), and the inner concrete of the outer wall is poured in layers every 2 m to a height of 8 m; the bottom of the scaffolding is welded on the deck and does not need to be removed from the semi-submersible barge.

4. The cylindrical foundation construction method for offshore wind power construction and transportation on a semi-submersible barge according to claim 3 is characterized by: In step d, the size of the pontoon (12) is 15×12×2m.

5. The cylindrical foundation construction method for offshore wind power construction and transportation on a semi-submersible barge according to claim 2 is characterized in that: In step d, one buoyancy box (12) is arranged on each side of the tube skirt (3), and a total of six buoyancy boxes (12) are arranged.

6. The cylindrical foundation construction method for offshore wind power construction and transportation on a semi-submersible barge according to any one of claims 2 to 5, characterized in that: In step d, a lifting lug (11) is provided on the lower side of the buoy (12), and the anchor machine (8) is connected to the bottom hook by a steel wire rope (9) passing through a deck shackle (10) to hang on the lifting lug (11) on the buoy (12).

7. The cylindrical foundation construction method for offshore wind power construction and transportation on a semi-submersible barge according to claim 6 is characterized by: In step d, a lifting lug (11) is provided on the bottom plate (2), and the anchor machine (8) is connected to the top hook through the steel wire rope (9) to hang on the lifting lug (11) on the bottom plate (2).

8. The cylindrical foundation construction method for offshore wind power construction and transportation on a semi-submersible barge according to claim 7 is characterized by: In step d, rubber pads are filled between the buoyancy box (12) and the tube skirt (3) with a filling thickness of 20 cm and a filling height equal to the concrete pouring height to prevent the outer tube wall from colliding with the edge.

9. The cylindrical foundation construction method for offshore wind power construction and transportation on a semi-submersible barge according to claim 2 is characterized by: In step e, the draft of the barrel foundation is 6m during floating transportation, and the air pressure in each compartment of the barrel foundation is monitored and adjusted to maintain 35kpa, while the force on the bottom hook is controlled within the range of 600 to 1200 tons.

10. The cylindrical foundation construction method for offshore wind power construction and transportation on a semi-submersible barge according to claim 2 is characterized by: In step e, the bottom hook wire rope (9) is loosened, the cylindrical foundation is inflated to 50 kPa and begins to float, and then the air pressure in each compartment of the cylindrical foundation is adjusted to maintain 35 kPa, so that the cylindrical foundation is suspended and balanced, and the two bottom hooks on the side of the semi-submersible barge (5) are removed and connected to the hook points of the two anchor boats (14) for cross positioning.

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