阅读说明：本技术 适用于半潜驳上建造运输海上风电筒型基础的施工结构及方法 (Construction structure and method suitable for building and transporting offshore wind power cylindrical foundation on semi-submersible barge ) 是由 刘海波 吴司洲 陶铁铃 邹尤 曾斌 何杰 甘乐 张鹏 张发印 刘璟 于 2021-05-19 设计创作，主要内容包括：本发明涉及一种适用于半潜驳上建造运输海上风电筒型基础的施工结构及方法。本发明通过半潜驳靠泊码头焊接脚手架并进行筒裙施工,半潜驳下沉降低作业高度,基础贝雷架吊挂底板施工,支模进行过渡段施工,基础筒裙焊接浮箱并与半潜驳固定,基础整体运输到施工现场,基础充气上浮与半潜驳分离,基础负压下沉进行自重下沉和负压下沉施工。解决了传统筒型基础制造难度大、运输成本高、下沉安装风险大、大吨位龙门吊倒驳、需要拆除胎架、浮运时稳性不佳等弊端,实现了海上风机筒型基础一体化制造运输安装过程,兼有节省制造场地及吊运费用、消除基础倒驳工期、实现脚手架及浮箱重复利用、提高了基础运输下沉施工的稳定性。(The invention relates to a construction structure and a construction method suitable for building a cylindrical foundation for transporting offshore wind power on a semi-submersible barge. The method comprises the steps of welding a scaffold through a semi-submersible barge berthing wharf and carrying out skirt construction, sinking the semi-submersible barge to reduce the operation height, hanging a bottom plate on a foundation bailey frame for construction, erecting a formwork for construction of a transition section, welding a floating box on the foundation skirt and fixing the foundation skirt and the semi-submersible barge, integrally transporting the foundation to a construction site, floating the foundation by inflation and separating the foundation from the semi-submersible barge, and carrying out self-weight sinking and negative pressure sinking construction through negative pressure sinking of the foundation. The defects that a traditional cylindrical foundation is large in manufacturing difficulty, high in transportation cost, large in sinking installation risk, large-tonnage gantry cranes are refuted, a jig frame needs to be detached, and the stability during floating is poor are overcome, the integrated manufacturing, transporting and installing process of the offshore fan cylindrical foundation is realized, the manufacturing field and the handling cost are saved, the foundation refuting period is eliminated, the scaffold and the buoyancy tank are recycled, and the stability of foundation transportation sinking construction is improved.)

1. The utility model provides a be applicable to semi-submerged barge and build transportation marine wind power section of thick bamboo type foundation construction structure which characterized in that: the semi-submersible barge structure comprises a cylindrical foundation, a semi-submersible barge (5) and an anchor machine (8), wherein the cylindrical foundation comprises a transition section (1), a bottom plate (2) and a skirt (3), the semi-submersible barge (5) is close to a berth wharf and is anchored and fixed, the skirt (3) is assembled and poured on the semi-submersible barge (5), and a bottom sealing steel plate bottom structure is supported and welded; the semi-submersible barge (5) is sunk to a sea bed surface (7), so that the bottom sealing steel plate is exposed out of the water surface, a bottom plate (2) is poured on the bottom sealing steel plate, and then a transition section (1) is poured on the concrete bottom plate (2);

buoyancy tanks (12) are uniformly distributed around the cylindrical skirt (3), and the buoyancy tanks (12) are connected with deck shackles (10) on the semi-submersible barge (5) through steel wire ropes (9) and then connected with an anchor machine (8); the bottom plate (2) is connected with an anchor machine (8) through a steel wire rope (9);

the semi-submersible barge (5) transports a cylindrical foundation to a designated machine position, the semi-submersible barge (5) sinks, an anchor machine (8) connected with the buoyancy tank (12) is reversed, a steel wire rope (9) connected with the buoyancy tank (12) is loosened, the cylindrical foundation is inflated to float, and the anchor machine (8) connected with the buoyancy tank (12) is replaced by an anchor boat (14); reversing an anchor machine (8) connected with the bottom plate (2), loosening a steel wire rope (9) connected with the bottom plate (2), and moving the semi-submersible barge (5) away from a machine position;

the anchor boat (14) is stressed to tighten and position, the cylindrical foundation is exhausted to sink to the bottom to contact the sea bed surface (7), the buoyancy tank (12) is filled with water to sink, and the buoyancy tank (12) is released; and each cabin of the cylindrical foundation is continuously sunk to the designed elevation through pumping and exhausting.

2. A construction method suitable for building and transporting offshore wind power cylindrical foundations on a semi-submersible barge is characterized by comprising the following steps of: the method comprises the following steps:

a. and (3) constructing the skirt: the semi-submersible barge (5) is close to a dock and is anchored and fixed, a pouring cylinder skirt (3) is assembled on the semi-submersible barge (5), and the bottom structure of the bottom sealing steel plate is supported and welded after the completion; when the cylindrical skirt (3) is assembled and poured, double rows of scaffolds are externally erected, full scaffolds are internally erected to serve as construction operation platforms, and steel plates are welded to the bottoms of the scaffolds to be fixed to a deck;

b. constructing a foundation slab: the semi-submersible barge (5) sits at the bottom and sinks to enable the bottom sealing steel plate to be exposed out of the water surface, the bottom plate and the upturned beam steel bar are bound firstly, then a concrete bottom plate is poured on the bottom sealing steel plate, and finally the upturned beam concrete and a part of the transition section (1) are poured by a formwork;

c. constructing a foundation transition section: the inside and outside of the construction bin wall of the transition section (1) adopt steel templates as supports, full-hall disc buckle type scaffolds are erected inside the transition section as supporting and operating platforms, the inner templates are completely installed, single-row scaffolds are adopted outside the transition section as platforms, and reverse formwork construction is carried out layer by layer;

d. suspending a buoyancy tank: the buoyancy tanks (12) are transported to the vicinity of the cylindrical foundation by the semi-submersible barge (5), the buoyancy tanks (12) are uniformly distributed on the wall of the cylindrical skirt, the buoyancy tanks (12) are inflated, drained and floated, and the buoyancy tanks (12) are connected and bound through steel wire ropes (9), so that the buoyancy tanks (12) surround the cylindrical skirt (3) for connection, and the buoyancy tanks (12) are prevented from shaking; the buoyancy tank (12) is connected with the deck shackle (10) through a steel wire rope (9) and then connected with the anchor machine (8); the bottom plate (2) is connected with an anchor machine (8) through a steel wire rope (9);

e. carrying out foundation floating transportation and separation: after the cylindrical foundation is transported to a designated machine position by the semi-submerged barge (5), the semi-submerged barge (5) sinks; reversing a winch of the anchor machine (8), loosening a steel wire rope (9) connected with the buoyancy tank (12), inflating the cylindrical foundation to start floating, adjusting the air pressure in each cabin of the foundation after the scaffold is separated from the height of the cylindrical skirt (8) to enable the cylindrical foundation to be suspended and balanced, taking down a bottom hook on one side of the semi-submerged barge (8), and replacing the bottom hook with a hook point of an anchor boat (14) to facilitate positioning; reversing a winch of the anchor machine (8), loosening a steel wire rope (9) connected with the base plate (2), taking down a top hook lifting hook of the base plate (2), and moving the semi-submersible barge (5) away from a machine position;

f. foundation sinking: the bottom hook anchor is stressed, tightened and positioned through the anchor boat (14), the cylindrical foundation is exhausted and begins to sink to the bottom to be in contact with the seabed surface (7), the buoyancy tank (12) is filled with water and sinks, and the buoyancy tank (12) is released; and (5) continuously sinking all cabins of the cylindrical foundation to the designed elevation through water pumping and air exhausting, and finishing the installation of the cylindrical foundation.

3. The construction method suitable for building and transporting offshore wind power barrel-shaped foundations on semi-submersible barge according to claim 2, characterized in that: in the step a, 2m of the outer cylinder wall of the cylinder type foundation and a bin dividing plate are welded and assembled in a segmented mode on a semi-submersible barge (5), and concrete in the outer cylinder wall is poured in layers of 2m per layer until the height of the concrete is 8 m; the bottom of the scaffold is welded on the deck and does not need to be taken out of the semi-submersible barge.

4. The construction method suitable for building and transporting offshore wind power barrel-shaped foundations on semi-submersible barge according to claim 3, characterized by comprising the following steps: in step d, the size of the buoyancy tank (12) is 15 × 12 × 2 m.

5. The construction method suitable for building and transporting offshore wind power barrel-shaped foundations on semi-submersible barge according to claim 2, characterized in that: in the step d, 1 buoyancy tank (12) is arranged on each surface of the cylinder skirt (3), and 6 buoyancy tanks (12) are arranged in total.

6. The construction method suitable for building and transporting the offshore wind power cylindrical foundation on the semi-submersible barge according to any one of claims 2 to 5, wherein the construction method comprises the following steps: in the step d, lifting lugs (11) are arranged on the lower side of the buoyancy tank (12), and the anchor windlass (8) penetrates through the deck shackle (10) through a steel wire rope (9) to be connected with the bottom hook to hang the lifting lugs (11).

7. The construction method suitable for building and transporting offshore wind power barrel-shaped foundations on semi-submersible barge according to claim 6, characterized in that: in the step d, a lifting lug (11) is arranged on the bottom plate (2), and the anchor machine (8) is connected with a top hook through a steel wire rope (9) to hang the lifting lug (11).

8. The construction method suitable for building and transporting offshore wind turbine type foundation on semi-submersible barge according to claim 7, characterized in that: and d, filling rubber cushion blocks between the buoyancy tank (12) and the skirt (3), wherein the filling thickness is 20cm, and the filling height is the concrete pouring height, so that the outer cylinder wall is prevented from colliding with the edge shape.

9. The construction method suitable for building and transporting offshore wind power barrel-shaped foundations on semi-submersible barge according to claim 2, characterized in that: and e, draught of the cylindrical foundation is 6m during floating transportation, air pressure in each cabin of the cylindrical foundation is monitored and adjusted to be 35kpa, and meanwhile the stress of the bottom lifting hook is controlled to be within the range of 600-1200 tons.

10. The construction method suitable for building and transporting offshore wind power barrel-shaped foundations on semi-submersible barge according to claim 2, characterized in that: and e, loosening the steel wire rope (9) of the bottom hook, inflating the cylindrical foundation to 50kpa to start floating, adjusting the air pressure in each cabin of the cylindrical foundation to keep 35kpa, keeping the cylindrical foundation in a balanced suspension state, taking down 2 bottom hooks on the side of the semi-submerged barge (5), and connecting hook points of 2 anchor boats (14) for cross positioning.

Technical Field

The invention relates to an offshore wind power cylindrical foundation, in particular to a construction structure and a construction method suitable for building and transporting an offshore wind power cylindrical foundation on a semi-submersible barge.

Background

The cylinder type foundation structure and the traditional cylinder type foundation have obvious difference in material application, structural form and bearing characteristics, the compartment design with the diameter larger than 30m effectively improves the anti-inclination bearing capacity of the soft foundation, but the traditional suction type composite cylinder type foundation still has the following defects in manufacturing and transportation:

(1) the construction of the cylindrical foundation requires a large enough wharf field, the wharf water depth is at least 8m, the construction period for constructing and pouring the cylindrical foundation is at least 2 months, and the renting cost is quite expensive in southern cities such as Guangdong Fujian and the like;

(2) most of the existing method for launching the cylindrical foundation adopts a module truck group to push the foundation to the shore along a track, and the launching is hoisted by a 5000-ton gantry crane, so that the cost for purchasing the module truck to lay the track or building the 5000-ton gantry crane is very high;

(3) the cylindrical foundation occupies a large area, has heavy weight, high structure and large difficulty in floating transportation or wet towing, requires a 5000-ton floating crane for separation and sinking installation of the ship cylinder, and has very high requirement on underwater construction precision.

Disclosure of Invention

In order to solve the problems, the invention provides a construction structure and a construction method suitable for building and transporting a cylindrical foundation of offshore wind power on a semi-submersible barge, and realizes the integrated manufacturing, transporting and installing process of the cylindrical foundation of the offshore wind turbine.

The technical scheme adopted by the invention is as follows: the utility model provides a construction structures suitable for semi-submerged barge builds marine wind power section of thick bamboo type basis of transportation which characterized in that: the semi-submersible barge is anchored and fixed by a dock, and is assembled and cast with the skirt and is subjected to support welding of a bottom sealing steel plate bottom structure; the semi-submersible barge sinks to the surface of the sea bed, so that the bottom sealing steel plate is exposed out of the water surface, a bottom plate is poured on the bottom sealing steel plate, and then a transition section is poured on the concrete bottom plate;

buoyancy tanks are uniformly distributed around the cylindrical skirt, are connected with deck shackles on the semi-submersible barge through steel wire ropes and are then connected with an anchor machine; the bottom plate is connected with an anchor machine through a steel wire rope;

the semi-submersible barge transports the cylindrical foundation to a designated machine position, the semi-submersible barge sinks, the anchor machine connected with the buoyancy tank is reversed, the steel wire rope connected with the buoyancy tank is loosened, the cylindrical foundation is inflated to float, and the anchor machine connected with the buoyancy tank is replaced by an anchor boat; reversing the anchor machine connected with the bottom plate, loosening the steel wire rope connected with the bottom plate, and moving the semi-submersible barge away from the machine position;

the anchor boat anchor is stressed to be tightened and positioned, the cylindrical foundation is exhausted to sink to the bottom to be in contact with the surface of the sea bed, the buoyancy tank is injected with water to sink, and the buoyancy tank is released; and each cabin of the cylindrical foundation is continuously sunk to the designed elevation through pumping and exhausting.

A construction method suitable for building and transporting offshore wind power cylindrical foundations on a semi-submersible barge is characterized by comprising the following steps of: the method comprises the following steps:

a. and (3) constructing the skirt: the semi-submersible barge is anchored and fixed at the dock, a pouring cylinder skirt is assembled on the semi-submersible barge, and the bottom structure of the bottom sealing steel plate is supported and welded after the completion; when the skirt is assembled and poured, double rows of scaffolds are externally erected, full scaffolds are internally erected to serve as construction operation platforms, and steel plates are welded at the bottoms of the scaffolds to be fixed with a deck;

b. constructing a foundation slab: the semi-submersible barge is sunk to expose a bottom sealing steel plate out of the water, the bottom plate and the upturned beam steel bar are bound, then a concrete bottom plate is poured on the bottom sealing steel plate, and finally the upturned beam concrete and a part of transition section are poured by a formwork;

c. constructing a foundation transition section: steel templates are adopted inside and outside the construction bin wall of the transition section as supports, full-hall disc-buckle type scaffolds are erected inside the construction bin wall as support and operation platforms, the inner templates are completely installed, single-row scaffolds are adopted outside the construction bin wall as platforms, and reverse formwork construction is carried out layer by layer;

d. suspending a buoyancy tank: the buoyancy tanks are transported to the vicinity of the cylindrical foundation by the semi-submersible barge, the buoyancy tanks are uniformly distributed on the wall of the cylindrical skirt, the buoyancy tanks are inflated, drained and floated, and the buoyancy tanks are connected and bound through steel wire ropes, so that the buoyancy tanks surround the cylindrical skirt for connection, and the buoyancy tanks are prevented from shaking; the buoyancy tank is connected with the deck shackle through a steel wire rope and then connected with the anchor machine; the bottom plate is connected with the anchor machine through a steel wire rope;

e. carrying out foundation floating transportation and separation: after the cylindrical foundation is transported to a designated machine position by the semi-submersible barge, the semi-submersible barge sinks; reversing the winch of the anchor machine, loosening a steel wire rope connected with the buoyancy tank, inflating the cylindrical foundation to start floating, adjusting the air pressure in each cabin of the foundation after the scaffold is separated from the height of the cylindrical skirt, enabling the cylindrical foundation to be suspended and balanced, taking down a bottom hook on one side of the semi-submerged barge, and replacing the bottom hook with an anchor boat hook point to facilitate positioning; reversing the anchor winch, loosening the steel wire rope connected with the bottom plate, taking down the top hook lifting hook of the foundation bottom plate, and moving the semi-submersible barge away from the machine position;

f. foundation sinking: the bottom hook anchor is stressed to be tightened and positioned through the anchor boat, the cylindrical foundation exhaust begins to sink to the bottom to contact the surface of the sea bed, the buoyancy tank is filled with water to sink, and the buoyancy tank is released; and (5) continuously sinking all cabins of the cylindrical foundation to the designed elevation through water pumping and air exhausting, and finishing the installation of the cylindrical foundation.

Preferably, in the step a, the outer cylinder wall of the cylindrical foundation and the bin dividing plates are welded and assembled in a 2m block by block mode on the semi-submersible barge, and concrete in the outer cylinder wall is poured in layers of 2m per layer until the height of the concrete is 8 m; the bottom of the scaffold is welded on the deck and does not need to be taken out of the semi-submersible barge.

Preferably, in step d, the size of the buoyancy tank is 15 × 12 × 2 m.

Preferably, in step d, 1 buoyancy tank is arranged on each side of the skirt, and 6 buoyancy tanks are arranged in total.

Preferably, in the step d, a lifting lug is arranged on the lower side of the buoyancy tank, and the anchor machine penetrates through the deck shackle through a steel wire rope to be connected with the bottom hook to hang the lifting lug.

Preferably, in the step d, a lifting lug is arranged on the bottom plate, and the anchor machine is connected with the top hook through a steel wire rope to hang the lifting lug.

Preferably, in the step d, rubber pads are filled between the buoyancy tank and the skirt, the filling thickness is 20cm, the filling height is a concrete pouring height, and the outer cylinder wall is prevented from colliding with the edge shape.

Preferably, in the step e, the cylindrical foundation is draught for 6m during floating, the air pressure in each cabin of the cylindrical foundation is monitored and adjusted to be 35kpa, and meanwhile the stress of the bottom lifting hook is controlled to be within the range of 600-1200 tons.

Preferably, in the step e, the steel wire rope of the bottom hook is loosened, the cylindrical foundation is inflated to 50kpa to start floating, then the air pressure in each cabin of the cylindrical foundation is adjusted to keep 35kpa, the cylindrical foundation is suspended and kept balanced, 2 bottom hooks on the semi-submerged barge side are taken down, and 2 anchor boat hook points are connected for cross positioning.

The beneficial effects obtained by the invention are as follows: the defects that a traditional cylindrical foundation is large in onshore manufacturing difficulty, high in wet towing transportation cost, large in sinking installation risk, large in tonnage gantry crane refutes, a jig frame needs to be removed, and the floating transportation stability is poor are overcome, the integrated manufacturing, transporting and installing process of the offshore wind turbine cylindrical foundation is realized, the manufacturing field and the handling cost are saved, the foundation refuting period is eliminated, the scaffold and the buoyancy tank are recycled, the stability of cylindrical foundation transportation sinking construction is improved, compared with a composite cylindrical foundation manufactured onshore, the comprehensive manufacturing cost can be reduced by 10% -25%, the manufacturing and transporting period is shortened, the economical efficiency is good, and the popularization and the utilization are facilitated.

Drawings

FIG. 1 is a schematic view of pouring transition section concrete of a semi-submersible barge under-seat of the invention;

FIG. 2 is a schematic plan view of the suspension positions of the buoyancy tanks and the bottom plate hooks in the case of the semi-submersible barge transportation cylinder type foundation of the invention;

FIG. 3 is a schematic elevation view of the suspension positions of the buoyancy tanks and the bottom plate hooks in the case of the semi-submersible barge transportation cylinder foundation of the invention;

FIG. 4 is a schematic view of the semi-submersible barge and anchor boat limiting the movement plane of the cylindrical foundation when the cylindrical foundation is submerged under negative pressure;

reference numerals: 1. a transition section; 2. a base plate; 3. a skirt; 4. a scaffold; 5. semi-submerged barge; 6. a pump truck; 7. a sea bed surface; 8. an anchor machine; 9. a wire rope; 10. the deck is broken off; 11. Lifting lugs; 12. a buoyancy tank; 13. a rubber cushion block; 14. and (5) anchoring the boat.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments.

As shown in fig. 1-4, the invention relates to a construction structure suitable for constructing and transporting a marine wind power cylinder type foundation on a semi-submersible barge, which is characterized in that: the semi-submerged barge structure comprises a cylindrical foundation, a semi-submerged barge 5 and an anchor machine 8, wherein the cylindrical foundation comprises a transition section 1, a bottom plate 2 (which is of a bottom surface steel-clad concrete polygonal structure) and a skirt 3 (which is of a steel-clad concrete structure), the semi-submerged barge 5 is close to a wharf and anchored and fixed, the skirt 3 is assembled and poured on the semi-submerged barge 5, and the bottom structure of a bottom sealing steel plate is supported and welded; the semi-submersible barge 5 sinks to a sea bed surface 7, so that a bottom sealing steel plate is exposed out of the water surface, a bottom plate 2 is poured on the bottom sealing steel plate, and then a transition section 1 is poured on the concrete bottom plate 2; buoyancy tanks 12 are uniformly distributed around the cylindrical skirt 3, and the buoyancy tanks 12 are connected with deck shackles 10 on the semi-submerged barge 5 through steel wire ropes 9 and then connected with an anchor machine 8; the bottom plate 2 is connected with an anchor machine 8 through a steel wire rope 9;

the semi-submersible barge 5 transports the cylindrical foundation to a designated machine position, the semi-submersible barge 5 sinks, reverses the anchor machine 8 connected with the buoyancy tank 12, loosens the steel wire rope 9 connected with the buoyancy tank 12, inflates the cylindrical foundation to float, and replaces the anchor machine 8 connected with the buoyancy tank 12 with an anchor boat 14; reversing the anchor machine 8 connected with the bottom plate 2, loosening the steel wire rope 9 connected with the bottom plate 2, and moving the semi-submersible barge 5 away from the machine position;

the anchor boat 14 is stressed to tighten and position, the cylindrical foundation is exhausted to sink to the bottom to contact the sea bed surface 7, the buoyancy tank 12 is filled with water to sink, and the buoyancy tank 12 is released; and (5) continuously sinking all cabins of the cylindrical foundation to the designed elevation through water pumping and air exhausting, and finishing the installation of the cylindrical foundation.

The concrete construction process is as follows:

a. and (3) constructing the skirt: the semi-submersible barge 5 is close to a berth wharf and anchored and fixed, a cylindrical skirt 3 is assembled and poured on the semi-submersible barge 5 (an assembled module steel plate manufactured by an assembly factory and a concrete layer is poured on the outer bin wall), and the bottom lattice support welding of a bottom sealing steel plate is carried out after the assembly; when the cylindrical skirt 3 is assembled and poured, double rows of scaffolds 4 are externally erected, and full scaffolds 4 are internally erected to serve as construction operation platforms; the bottom of the scaffold 4 is welded with a steel plate and fixed with a deck;

b. constructing a foundation slab: referring to the figure 1, the semi-submersible barge 5 sinks to the sea bed surface 7 in a sitting mode to enable the bottom sealing steel plate 2 to be exposed out of the water surface, a bailey frame hanging mode is adopted as a bottom support, the bottom plate and the upturned beam steel bars are bound to be finished, then the concrete bottom plate 2 is poured, the bailey frame is removed after the strength meets the design removal requirement, and finally the upturned beam concrete and a part of the transition section 1 are poured by a pump truck 6 for formwork erection;

c. constructing a foundation transition section: the inside and outside of the construction bin wall of the transition section 1 adopt steel templates as supports, full hall disc buckle type scaffolds 4 as support and operation platforms are erected inside, the inner templates are completely installed, single rows of scaffolds 4 are adopted as platforms outside, and reverse formwork construction is carried out layer by layer;

d. suspending a buoyancy tank: referring to fig. 2 and 3, the buoyancy tanks 12 are transported to the vicinity of the cylindrical foundation by the semi-submersible barge 5, one buoyancy tank 12 is arranged on each of the six cylindrical skirt walls 3, the buoyancy tanks 12 are inflated, drained and floated, and the buoyancy tanks 12 are connected and bound through steel wire ropes 9, so that the buoyancy tanks 12 surround the cylindrical foundation for connection; lifting lugs 11 are arranged on the outer sides of the buoyancy tanks 12, and bottom hooks are fixedly connected with the deck shackles 10; the bottom plate 2 is provided with a lifting lug 11, and the top hook is connected with a ship anchor machine 8.

e. Carrying out foundation floating transportation and separation: with reference to fig. 2-4, after the transportation reaches the designated machine position, the semi-submersible barge 5 sinks; the bottom hook steel wire rope 9 is loosened by a winch of the reverse anchor machine 8, a top hook anchor is stressed to be tightened, the cylindrical foundation is inflated to start floating, the air pressure cylindrical foundation in each cabin of the cylindrical foundation is adjusted to be suspended and balanced after the scaffold 4 is separated from the height of the cylindrical skirt, the bottom hook on one side of the semi-submerged barge 5 is taken down and replaced by the anchor boat 8 hook point to facilitate positioning; the winch of the reverse anchor machine 8 loosens the top hook steel wire rope 9, the top hook anchor is stressed to be tightened, the top hook lifting hook of the foundation slab 2 is taken down, and the semi-submersible barge 5 slowly moves the anchor to move laterally and is far away from the machine position;

f. foundation sinking: the bottom hook anchor is stressed to be tightened and positioned, the cylindrical foundation is exhausted to sink to the bottom to be in contact with the sea bed surface 7, the buoyancy tank 12 is filled with water to sink, and the buoyancy tank 12 is released; and (5) continuously sinking all cabins of the cylindrical foundation to the designed elevation through water pumping and air exhausting, and finishing the installation of the cylindrical foundation.

Further, in the step a, the outer cylinder wall of the foundation cylinder skirt 3 and the bin dividing plates are welded and assembled in a 2m block by block mode on the semi-submerged barge 5, and concrete in the outer cylinder wall is poured in layers of about 2 meters per layer until the height of the concrete is 8 meters; the bottom of the scaffold 4 is welded on the deck and does not need to be taken out of the semi-submersible barge 5.

Further, in step d, the size of the buoyancy tanks 12 is 15 × 12 × 2m, 1 buoyancy tank 12 is arranged on each surface of the cylindrical foundation, and 6 buoyancy tanks 12 are needed; lifting lugs 11 are arranged on the lower sides of the buoyancy tanks 12, and steel wire ropes 9 of the anchor machines 8 penetrate through deck shackles 10 to be connected with lifting hooks to hang the lifting lugs 11; rubber cushion blocks 13 are filled between the buoyancy tank 12 and the cylindrical foundation, the filling thickness is 20cm, the filling height is the concrete pouring height, and the outer cylindrical wall is prevented from colliding with the edge shape; the buoyancy tanks 12 are connected and bound through the steel wire ropes 9, so that the buoyancy tanks 12 are prevented from shaking; the bottom plate 2 is provided with 4 lifting lugs 11, and a steel wire rope 9 of the anchor machine 8 is connected with a lifting hook to hang the lifting lugs 11.

Further, in step e, the draft of the cylindrical foundation is about 6m during floating, the air pressure in each cabin of the cylindrical foundation is monitored and adjusted to be about 35kpa, and meanwhile, the stress of the bottom lifting hook is controlled within the range of 600-1200 tons.

Further, in the step e, after the transportation reaches the designated machine position, the semi-submersible barge 5 sinks for 8m until the scaffold 4 is separated from the cylindrical skirt 3; loosening the steel wire rope 9 of the bottom hook, inflating the cylindrical foundation to 50kpa to start floating, adjusting the air pressure in each cabin of the cylindrical foundation to keep 35kpa to keep the cylindrical foundation in a balanced suspension state, taking off 2 bottom hook lifting hooks on the ship side, and connecting 8 hook points of the anchor windlass 14 for cross positioning.

Further, in the step e, circulating operation is carried out through 8 hoisting points of the anchor loosening machine, basic exhaust and 8 hoisting points of the anchor loosening machine, the 8 hoisting points of the anchor loosening machine and the basic exhaust are completed through the cooperation of an automatic control system and manual monitoring operation, and the basic suspension is kept in a balanced state.

Further, in step f, the onboard anchoring machine 8 is removed before the buoyancy tanks 12 are unbundled and the hook buoyancy tanks 12 are disconnected, the cable 9 of the anchor boat 14 is tensioned and the row of buoyancy tanks 12 is pulled to be spread out of the skirt 3.

The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.