CN115341567A

CN115341567A - Non-grouting connected offshore wind turbine pile and bucket combined foundation and construction method thereof

Info

Publication number: CN115341567A
Application number: CN202210993671.7A
Authority: CN
Inventors: 李立辰; 吴文兵; 刘卓; 张云鹏; 罗仑博; 刘浩; 刘鑫; 闻敏杰
Original assignee: China University of Geosciences
Current assignee: China University of Geosciences
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2022-11-15
Anticipated expiration: 2042-08-18
Also published as: CN115341567B

Abstract

A pile-barrel combined foundation of a non-grouting connected offshore wind turbine and a construction method thereof are disclosed, wherein the pile-barrel combined foundation comprises a single-pile foundation and a barrel foundation, the barrel foundation comprises an inner barrel and an outer barrel, the inner barrel and the outer barrel are rigidly connected, and are integrally formed and sleeved on the single-pile foundation; in the single pile foundation, a plurality of groups of pile body racks are arranged at the contact section of a pile body and an inner barrel along the circumferential direction, two ends of the inner barrel are opened, the inner wall of the inner barrel is provided with grooves with the number corresponding to the number of the pile body racks along the circumferential direction, and a plurality of rollers rotating in a directional mode are prefabricated in the grooves; the pile body rack and the roller form matching to realize the connection of the single pile foundation and the bucket foundation; the single pile foundation is characterized in that a limiting device is arranged on the pile wall at the lower end of a pile body rack, and the thickness of the limiting device is larger than the protruding height of the pile body rack; the upper end of the outer barrel is a closed top plate, the lower end of the outer barrel is opened, the height of the outer barrel is lower than that of the inner barrel, and the diameter of the outer barrel is larger than that of the inner barrel. The invention does not need to connect the pile-barrel structure in a grouting mode, realizes the optimization of the connection form of the single-pile foundation and the barrel foundation and fully exerts the bearing efficiency of the single-pile foundation and the barrel foundation.

Description

Non-grouting connected offshore wind turbine pile and bucket combined foundation and construction method thereof

Technical Field

The invention relates to the field of offshore wind turbine foundations, in particular to a non-grouting connected offshore wind turbine pile and bucket combined foundation and a construction method thereof.

Background

The offshore wind turbine is key equipment for offshore wind power generation, wherein a wind turbine foundation is used as a wind turbine tower and a supporting structure of a unit, and the wind turbine foundation is an important guarantee for maintaining normal operation of the offshore wind turbine. At present, more than 60% of offshore wind turbine units use single-pile foundations wholly or partially. Offshore wind power resources are quite rich, however, in some sea areas, geological conditions are complex, a covering layer is shallow, a conventional single-pile foundation needs to be embedded into lower bedrock to provide enough bearing capacity, and offshore rock-socketed pile construction needs a large-scale drilling machine and related auxiliary equipment, so that the construction operation period is long, and safety risks such as hole collapse in drilling holes are met. With the increasing capacity of the offshore wind turbine single machine, the conventional single-pile foundation needs to have a larger size to meet the requirement of the bearing capacity of the foundation, which also leads to the remarkable increase of the construction cost and the construction risk of the single-pile foundation.

In view of the above problems, in recent years, researchers have proposed a concept of a single-pile combined foundation, that is, a single-pile foundation and a shallow foundation are combined, and by exerting the anchoring effect of the single-pile foundation and the horizontal bearing advantage of the shallow foundation, the pile diameter and the penetration depth are reduced while the overall bearing capacity of the foundation is improved, so as to achieve the purpose of economic and efficient bearing. The patent application with the application number of 201310144668.9 proposes that a cylindrical structure is coaxially sleeved outside a single-pile foundation, the structure is shallow in soil penetration depth and large in transverse size, and the utilization rate of the foundation on the near-surface shallow soil resistance can be improved. Patent application with application number 202011502553.9 proposes to combine a single pile foundation with a gravity disc, and a plurality of spiral piles are arranged on the periphery of the gravity disc, so that the requirement of foundation bearing capacity is met under the condition that rock embedding is not needed for the single pile.

One key problem in the design of single-pile combined foundations is the connection mode of the pile foundation and the shallow foundation. The patent application with application number 202011502553.9 proposes that the annular space between the pile foundation and the shallow foundation is subjected to underwater grouting treatment, so that the two foundations are fixed into a whole, and the method is a connecting method of a single-pile combined foundation which is applied more in the current process. However, the existing grouting connection method still has many problems and difficulties, including slurry type selection, selection of grouting process and grouting equipment, long construction period, slurry pollution and the like. Meanwhile, the grouting section is used as a weak link of a single-pile combined foundation, and the long-term bearing deformation mechanism of the grouting section is still unclear. Therefore, there is a need to provide a non-grouting method for connecting a single-pile combined foundation, which can avoid the problems of the conventional grouting method, fully utilize the bearing efficiency of the single-pile foundation and the shallow foundation, and provide a new idea for designing and constructing the offshore wind turbine single-pile combined foundation in the shallow overburden region.

Disclosure of Invention

The invention aims to solve the technical problems of grouting connection of the existing offshore wind turbine single-pile combined foundation, and provides a non-grouting connected offshore wind turbine pile-bucket combined foundation and a construction method thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a pile-barrel combined foundation of a non-grouting connected offshore wind turbine comprises a single pile foundation and a barrel foundation, wherein the barrel foundation comprises an inner barrel and an outer barrel, the inner barrel and the outer barrel are rigidly connected, and are integrally formed and sleeved on the single pile foundation; multiple groups of pile body racks are circumferentially arranged at the contact section of a pile body and an inner barrel of the single pile foundation, two ends of the inner barrel are provided with openings, the inner wall of the inner barrel is circumferentially provided with grooves with the number corresponding to that of the pile body racks, and a plurality of rollers capable of directionally rotating are prefabricated in the grooves; the single-pile foundation is matched with the roller through the pile body rack, and the connection between the single-pile foundation and the bucket foundation is realized through the directional rotation of the roller; the single pile foundation is characterized in that a limiting device is arranged on the pile wall at the lower end of a pile body rack, and the thickness of the limiting device is larger than the protruding height of the pile body rack; the upper end of the outer barrel is a closed top plate, the lower end of the outer barrel is opened, and the outer barrel is lower than the inner barrel in height and larger than the inner barrel in diameter.

According to the scheme, the roller comprises an inner roller fixing shaft, an expanding section of the inner roller fixing shaft and an outer roller gear, the inner roller fixing shaft is fixed in the groove, the expanding section of the inner roller fixing shaft and the inner roller fixing shaft are integrated and do not rotate, a pawl is arranged on the outer side of the expanding section of the inner roller fixing shaft, a shallow groove is formed in the inner wall of the outer roller gear, and the pawl is in directional contact with the shallow groove and controls the roller to rotate only in a single direction.

According to the scheme, the length of the outer roller gear along the axial direction is slightly larger than the length of the diameter expanding section of the inner fixed shaft, the pawls are fixed on the outer circular surfaces on two sides of the diameter expanding section of the inner fixed shaft of the roller through bolts, 4 pawls are arranged on each side, the number of the pawls is 8, and the pawls naturally droop along with gravity.

According to the scheme, the retaining plate is prefabricated below the roller and rotates around the retaining plate fixing shaft, the retaining plate fixing shaft is provided with the limiting ring, the limiting ring limits the retaining plate to move in the axial direction of the retaining plate fixing shaft, and the retaining plate keeps the soil on the lower portion of the barrel foundation out of the groove while ensuring that the pile body rack can pass through the groove of the inner barrel.

According to the scheme, the height of the inner barrel is the same as the length of the pile body rack.

According to the scheme, a plurality of rib plates are arranged between the outer barrel and the inner barrel along the annular direction, the part of each rib plate, which is positioned above the top plate, is a triangular rib plate, and the part, which is positioned below the top plate, is a square rib plate.

According to the scheme, the top plate of each cabin forms a closed top plate at the upper end of the outer barrel, and the top plate of each cabin is provided with a valve.

According to the scheme, the rib plates are provided with 4-8 groups.

According to the scheme, the single-pile foundation adopts the large-diameter steel pipe pile.

The invention also provides a construction method of the non-grouting connected offshore wind turbine pile and bucket combined foundation, which comprises the following steps:

the method comprises the following steps: installing a single-pile foundation, namely sinking the single-pile foundation to a preset position by adopting the conventional offshore large-diameter pipe pile construction equipment;

step two: the method comprises the steps of preparing before installing the bucket foundation, firstly checking whether valves of all cabins of the bucket foundation are closed, checking whether all rollers in a groove of an inner bucket can normally rotate and can only rotate in a single direction, and then hoisting the bucket foundation to the upper part of a pile foundation for centering and positioning;

step three: installing the bucket foundation, and continuously adjusting the position of the bucket foundation in the sinking process of the bucket foundation to ensure that the bucket foundation is aligned with the pile axis of the single-pile foundation; when the bucket foundation is to approach the seabed surface, the position of the bucket foundation is adjusted to ensure that each roller of the inner bucket is matched with the pile body rack, and the non-matched part is ensured to be in close contact; through carrying out evacuation and drainage to each cabin of bucket foundation, form the pressure differential inside and outside the bucket foundation, sink the bucket foundation through the mode of negative pressure, guarantee through adjusting each cabin internal pressure size that the bucket foundation sinks to the in-process and remains the horizontality throughout, at this moment, the installation of stake bucket combination basis is accomplished and is put into use.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the racks and the limiting devices with certain lengths are arranged at the specific positions of the pile body along the circumferential direction, the grooves are formed in the barrel foundation corresponding to the positions of the racks of the pile body, and the rollers with the directional bearings are arranged, so that the optimization of the connection form of the single-pile foundation and the barrel foundation is realized, the problems of slurry selection, a grouting process, grouting equipment selection, long construction period, slurry pollution and the like caused by grouting connection of the traditional single-pile combined foundation can be solved, the construction cost is reduced, and the engineering progress is accelerated;

2. the bucket foundation can move downwards relative to a single-pile foundation but cannot move upwards, and the bucket foundation has the following effects: when the single pile foundation bears vertical or horizontal load, the pile foundation and the barrel foundation are rigidly connected and form a whole to bear external load together; when a local scouring pit appears at the lower part of the bucket foundation, the bucket foundation dynamically adjusts the position thereof through self weight, so that the scouring pit is prevented from being further enlarged; due to the existence of the pile body limiting device, the bucket foundation cannot move downwards relative to the pile foundation all the time, and is locked with the pile foundation after reaching the extreme position to form complete rigid connection, so that the bearing efficiency of the single-pile foundation and the shallow foundation is fully exerted;

3. the non-grouting connection structure provided by the invention is convenient to process and quick to construct, is not only suitable for the pile-barrel combined foundation provided by the invention, but also suitable for the form of combining a single pile foundation with other shallow foundations, and has wide application prospect in the field of offshore wind turbine foundation construction in shallow overburden areas in the southeast coast of China.

Drawings

FIG. 1 is a schematic view of the overall structure of a non-grouting connected offshore wind turbine pile-bucket combined foundation according to the present invention;

FIG. 2 is a schematic view and a cross-sectional view of a mono-pile foundation of the present invention;

FIG. 3 is a cross-sectional view of a mono-pile foundation of the present invention;

FIG. 4 is a top view of a monopile foundation of the present invention;

FIG. 5 is a top view of the bucket foundation of the present invention;

FIG. 6 is a bottom view of the bucket foundation of the present invention;

FIG. 7 is a schematic view of the roller configuration of the present invention;

FIG. 8 is a side view of the roller construction of the present invention;

FIG. 9 is a schematic view of a retaining plate of the present invention;

in the figure, 1-single pile foundation, 2-pile body rack, 3-limiting device, 4-barrel foundation, 5-inner barrel, 6-outer barrel, 7-roller, 8-earth retaining plate, 9-valve, 10-roller outer gear, 11-pawl, 12-shallow groove, 13-roller inner fixing shaft, 14-groove, 15-ribbed plate, 16-earth retaining plate fixing shaft, 17-limiting ring, 18-roller inner fixing shaft expanding section, 19-outer barrel top plate, 20-triangular ribbed plate and 21-square ribbed plate.

Detailed Description

The embodiments of the present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1 to 6, the non-grouting connected offshore wind turbine pile-barrel combined foundation comprises a single-pile foundation 1 and a barrel foundation 4, wherein the barrel foundation 4 comprises an inner barrel 5 and an outer barrel 6, the inner barrel 5 is rigidly connected with the outer barrel 6, and the single-pile foundation 1 is integrally formed and sleeved with the inner barrel 5; in the single pile foundation 1, a plurality of groups of pile body racks 2 with certain length are circumferentially arranged at the contact section of a pile body and an inner barrel 5, two ends of the inner barrel 5 are provided with openings, the inner wall of the inner barrel 5 is circumferentially provided with grooves 14 with the number corresponding to that of the pile body racks 2, and a plurality of directionally rotating rollers 7 are prefabricated in the grooves 14; the single-pile foundation 1 is matched with the roller 7 through the pile body rack 2, and the connection between the single-pile foundation 1 and the bucket foundation 4 is realized through the directional rotation of the roller 7; the single pile foundation 1 is provided with a limiting device 3 on the pile wall at the lower end of a pile body rack 2, and the thickness of the limiting device 3 is larger than the protruding height of the pile body rack 2; the upper end of the outer barrel 6 is a closed top plate 19, the lower end is opened, the height of the outer barrel 6 is lower than that of the inner barrel 5, and the diameter of the outer barrel 6 is larger than that of the inner barrel 5; the height of the inner barrel 5 is the same as the length of the pile body rack 2. 6 groups of rib plates 15 are arranged between the outer barrel 6 and the inner barrel 5 along the circumferential direction, a triangular rib plate 20 is arranged at the upper part of the top plate 19, and a square rib plate 21 is arranged at the lower part of the top plate 19; the rib plate 15 is used for reinforcing the structure of the bucket foundation 4, and is used for dividing the bucket foundation 4 into a plurality of cabins, so that the subsequent sinking and installation of the bucket foundation 4 are facilitated. The top plate of each cabin forms a closed top plate 19 at the upper end of the outer barrel 6, a valve 9 is arranged on the top plate of each cabin, and the valves 9 drain and vacuumize the cabins to ensure the smooth installation of the barrel foundation 4.

As shown in fig. 7-8, the roller 7 comprises a roller inner fixed shaft 13, a roller inner fixed shaft expanding section 18 and a roller outer gear 10, wherein the roller inner fixed shaft 13 is fixed in the groove 14, the roller inner fixed shaft expanding section 18 and the roller inner fixed shaft 13 are integrated and do not rotate, a pawl 11 is arranged on the outer side of the roller inner fixed shaft expanding section 18, a shallow groove 12 is arranged on the inner wall of the roller outer gear 10, and the pawl 11 is in directional contact with the shallow groove 12 and controls the roller 7 to rotate only in one direction; the length of the roller external gear 10 along the axial direction is slightly larger than that of the inner fixed shaft expanding section 18.

As shown in fig. 9, a retaining plate 8 is prefabricated below the roller 7, the retaining plate 8 rotates around a retaining plate fixing shaft 16, a limiting ring 17 is arranged on the retaining plate fixing shaft 16, the limiting ring 17 limits the movement of the retaining plate 8 in the axial direction of the retaining plate fixing shaft 16, and the retaining plate 8 keeps the soil on the lower portion of the barrel foundation 4 out of the groove 14 while ensuring that the pile body rack 2 can pass through the inner barrel groove 14.

In the embodiment, a single pile foundation 1 adopts a large-diameter steel pipe pile, the diameter of the large-diameter steel pipe pile is 5m, the length of the large-diameter steel pipe pile is 40m, the wall thickness of the large-diameter steel pipe pile is 0.06m, the burial depth of the large-diameter steel pipe pile is 25m, 6 pile body racks 2 with the length of 7.5m are uniformly manufactured on the outer wall of the position 10.5m away from the pile top, the radian of each section of the pile body rack is 30 degrees, and an annular limiting device 3 is arranged at the position 0.1m below the pile body rack 2.

The roller external gear 10 of the roller 7 is 1m in length, 350mm in addendum circle diameter, 250mm in dedendum circle diameter and 200mm in middle diameter, and 4 shallow grooves 12 which are matched with the pawls 11 to limit reverse rotation of the roller 7 are manufactured and run through in length; manufacturing the roller inner fixed shaft expanding section 18, manufacturing a cylinder with the diameter of 80mm and the length of 980mm, then extending and manufacturing the roller inner fixed shaft 13 with the diameter of 40mm and the length of 300mm on two sides, wherein 4 pawls 11 are arranged on each side, the total number of eight pawls are fixed on two circular surfaces of the roller inner fixed shaft expanding section 18 by bolts, the pawls naturally droop along with gravity, the roller inner fixed shaft 13, the roller inner fixed shaft expanding section 18 and the outer gear 10 are assembled coaxially and centrally, and the pawls 11 are matched with the shallow grooves 12 to enable the roller 7 to rotate in one direction.

The length of the retaining plate 8 is 1m, the width is 0.5m, the thickness is 50mm, the diameter of the retaining plate fixing shaft 16 is 40mm, the length is 1.6m, the retaining plate fixing shaft 16 penetrates through the retaining plate 8, and two limiting rings 17 are arranged at the interface.

The diameter of the outer barrel 6 of the barrel foundation 4 is 14m, the length is 3m, the thickness of the top plate 19 and the wall thickness are 0.06m, and the outer barrel is completely embedded in the soil. The inner barrel 5 of the barrel foundation 4 is 7m in diameter, 7.5m in length and hollow within 5m in middle diameter and used for matching with a

single pile foundation

1, 6 sections of grooves 14 are uniformly manufactured on the inner wall of the inner barrel 5, the radial length of each groove 14 is 0.5m, the radian is 30 degrees, the length of each groove 14 penetrates through the

inner barrel

5, 4 rollers 7 and a soil retaining plate 8 are arranged in each section of groove 14, the distance is 1.75m, and the soil retaining plate 8 is arranged at the lowest part of the inner barrel 5. 6 triangular rib plates 20 are arranged between the inner barrel 5 and the outer barrel 6 along the annular direction, the length of the bottom of each triangular rib plate 20 is 3.5m, the height of each triangular rib plate is 4.5m, and the thickness of each triangular rib plate is 0.12m; the outer barrel is internally provided with 6 square rib plates 21, and the square rib plates 21 are 3.5m long, 3m wide and 0.12m thick.

It should be noted that the above dimensions are the suggested dimensions given in the embodiments of the present invention, and the specific dimensions may be adjusted according to actual requirements.

The invention relates to a construction method of a non-grouting connected offshore wind turbine pile and bucket combined foundation, which comprises the following steps:

the method comprises the following steps: and (3) installing the single-pile foundation 1, and sinking the single-pile foundation to the buried depth of 25m by adopting the conventional offshore large-diameter pipe pile construction equipment.

Step two: the method comprises the steps of preparing a barrel foundation 4 before installation, firstly checking whether each cabin valve 9 of the barrel foundation is closed, checking whether each roller 7 in a groove 14 of an inner barrel 5 can normally rotate and can only rotate in a single direction, and then hoisting the barrel foundation 4 to the upper part of a pile foundation 1 for centering and positioning;

step three: the barrel foundation 4 is installed, and the position of the barrel foundation 4 is continuously adjusted in the sinking process of the barrel foundation 4 to ensure that the barrel foundation 4 is aligned with the axis of the pile foundation 1; when the barrel foundation 4 is close to the seabed surface, the soil retaining plate 8 is kept horizontal, the effect of preventing soil from entering the groove 14 to interfere the roller 7 is achieved, the soil retaining plate 8 can rotate along the radial direction of the barrel, and the pile body rack 2 can enter the inner barrel groove 14 conveniently when the barrel is sunk; in the process, the position of the barrel foundation 4 is adjusted to ensure that each roller 7 of the inner barrel 5 can be matched with the pile body rack 2, and the non-matched part is ensured to be in close contact; through carrying out evacuation and drainage treatment to each cabin of bucket foundation 4, make the inside and outside pressure differential that forms of bucket foundation 4, make bucket foundation 4 sink to below the mud face through the mode of negative pressure to guarantee through adjusting each cabin internal pressure size that bucket foundation 4 sinks to the in-process and remains the horizontality throughout, until sinking to the design depth, bucket buried depth 3m, at this moment, the installation of stake bucket combination basis is accomplished and can be put into use.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are merely exemplary embodiments of the present invention, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. A non-grouting connected offshore wind turbine pile-barrel combined foundation is characterized by comprising a single-pile foundation (1) and a barrel foundation (4), wherein the barrel foundation (4) comprises an inner barrel (5) and an outer barrel (6), the inner barrel (5) and the outer barrel (6) are rigidly connected, and are integrally formed and sleeved on the single-pile foundation (1); multiple groups of pile body racks (2) are circumferentially arranged on the contact section of a pile body and an inner barrel (5) of the single pile foundation (1), two ends of the inner barrel (5) are opened, grooves (14) with the number corresponding to that of the pile body racks (2) are circumferentially formed in the inner wall of the inner barrel (5), and a plurality of rollers (7) which rotate directionally are prefabricated in the grooves (14); the single-pile foundation (1) is matched with the roller (7) through the pile body rack (2), and the connection between the single-pile foundation (1) and the barrel foundation (4) is realized through the directional rotation of the roller (7); the single pile foundation (1) is characterized in that a limiting device (3) is arranged on the pile wall at the lower end of a pile body rack (2), and the thickness of the limiting device (3) is larger than the protruding height of the pile body rack (2); the upper end of the outer barrel (6) is a closed top plate (19) and the lower end of the outer barrel is open, the height of the outer barrel (6) is lower than that of the inner barrel (5), and the diameter of the outer barrel (6) is larger than that of the inner barrel (5).

2. The offshore wind turbine pile barrel combination foundation of claim 1, wherein the roller (7) comprises an inner roller fixing shaft (13), an expanded diameter section (18) of the inner roller fixing shaft and an outer roller gear (10), the inner roller fixing shaft (13) is fixed in a groove (14), the expanded diameter section (18) of the inner roller fixing shaft and the inner roller fixing shaft (13) are integrated and do not rotate, a pawl (11) is arranged on the outer side of the expanded diameter section (18) of the inner roller fixing shaft, a shallow groove (12) is arranged on the inner wall of the outer roller gear (10), and the pawl (11) is in directional contact with the shallow groove (12) and controls the roller (7) to rotate only in one direction.

3. The non-grouting connected offshore wind turbine pile and bucket combined foundation according to claim 2, wherein the length of the roller external gear (10) in the axial direction is slightly greater than that of the inner fixed shaft expanding section (18), the pawls (11) are fixed on the outer circular surfaces on two sides of the roller inner fixed shaft expanding section (18) through bolts, 4 pawls are arranged on each side, and the pawls are 8 in total and naturally droop along with gravity.

4. The offshore wind turbine pile and bucket combination foundation of claim 1, wherein a retaining plate (8) is prefabricated under the roller (7), the retaining plate (8) rotates around a retaining plate fixing shaft (16), a limiting ring (17) is arranged on the retaining plate fixing shaft (16), the limiting ring (17) limits the retaining plate (8) to move in the axial direction of the retaining plate fixing shaft (16), and the retaining plate (8) keeps the soil on the lower part of the bucket foundation (4) out of the groove (14) while ensuring that the pile body rack (2) can pass through the inner bucket groove (14).

5. The non-grouting connected offshore wind turbine pile-bucket combination foundation of claim 1, wherein the height of the inner bucket (5) is the same as the length of the pile body rack (2).

6. The non-grouting connected offshore wind turbine pile and bucket combined foundation according to claim 1, wherein a plurality of rib plates (15) are arranged between the outer bucket (6) and the inner bucket (5) along the circumferential direction, the portions, located above the top plate (19), of the rib plates (15) are triangular rib plates (20), and the portions, located below the top plate (19), of the rib plates (15) are square rib plates (21).

7. The offshore wind turbine pile and bucket combination foundation of claim 6, wherein the top plate of each compartment forms a closed top plate (19) at the upper end of the outer bucket (6), and a valve (9) is arranged on the top plate of each compartment.

8. The non-grouting connected offshore wind turbine pile and bucket combination foundation as claimed in claim 6, wherein the rib plates (15) are provided with 4 to 8 groups.

9. The non-grouting connected offshore wind turbine pile and bucket combined foundation according to claim 1, wherein the single pile foundation (1) adopts a large-diameter steel pipe pile.

10. The construction method of the non-grouting connected offshore wind turbine pile and bucket combination foundation according to any one of claims 1 to 9, characterized by comprising the following steps:

the method comprises the following steps: installing a single-pile foundation (1), and sinking the single-pile foundation to a preset position by adopting the conventional offshore large-diameter pipe pile construction equipment;

step two: preparing a barrel foundation (4) before installation, firstly checking whether each cabin valve (9) of the barrel foundation (4) is closed, checking whether each roller (7) in a groove (14) of an inner barrel (5) can normally rotate and can only rotate in a single direction, and then hoisting the barrel foundation (4) to the upper part of a pile foundation (1) for centering and positioning;

step three: the barrel foundation (4) is installed, and the position of the barrel foundation (4) is continuously adjusted in the sinking process of the barrel foundation (4) to ensure that the barrel foundation is aligned with the pile axis of the single-pile foundation (1); when the barrel foundation (4) is close to the seabed surface, the position of the barrel foundation (4) is adjusted to ensure that each roller (7) of the inner barrel (5) is matched with the pile body rack (2), and the non-matched part is ensured to be in close contact; through carrying out evacuation and drainage treatment to each cabin of bucket foundation (4), form the pressure differential inside and outside bucket foundation (4), sink bucket foundation (4) through the mode of negative pressure, guarantee through adjusting each cabin internal pressure size that bucket foundation (4) sinks to the in-process and remains the horizontality all the time, sink to the design depth, at this moment, the installation of stake bucket combination basis is accomplished and is put into use.