CN112177030B

CN112177030B - Offshore wind turbine single-pile foundation with skirt edge and rib and construction method thereof

Info

Publication number: CN112177030B
Application number: CN202011024292.4A
Authority: CN
Inventors: 杨昊庆; 张璐璐; 魏鑫
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2022-01-25
Anticipated expiration: 2040-09-25
Also published as: CN112177030A

Abstract

The invention provides an offshore wind turbine single pile foundation with a skirt edge and ribs and a construction method thereof, wherein the pile foundation is a cylinder which is a hollow cylinder; the rib plate is a right-angle trapezoidal rib plate, the rib plate is arranged on the outer side wall of the tubular pile, the lower bottom edge of the right-angle trapezoidal rib plate is connected with the outer side wall of the column body, the acute angle end of the right-angle trapezoidal rib plate faces downwards, the right-angle trapezoidal rib plate is distributed outwards in a radial mode along the outer side wall of the column body, and the acute angle end of the right-angle trapezoidal rib plate forms a conical part located on the outer side wall of the column body; the cylinder component is sleeved on the outer side of the right-angled trapezoid rib plate, the cylinder component is connected with the column body through the right-angled trapezoid rib plate, the inner wall of the cylinder component is connected with the upper bottom edge of the right-angled trapezoid rib plate, and the length of the cylinder component is the same as that of the upper bottom edge of the right-angled trapezoid rib plate. The steel pile anti-scouring device is simple in structure and strong in integrity, the horizontal bearing capacity and the anti-scouring effect of the steel pile are obviously improved, multiple effects are achieved for the complex marine environment of an offshore wind turbine, and the application prospect in marine wind power is wide.

Description

Offshore wind turbine single-pile foundation with skirt edge and rib and construction method thereof

Technical Field

The invention relates to the technical field of wind power generation, in particular to an offshore wind turbine single-pile foundation with a skirt edge and ribs and a construction method thereof.

Background

Energy is the basis of modern society and economic development, however, with the increase of population and the increasing development of social economy, the consumption of energy is also rapidly increased, and the energy crisis is gradually appeared. The development of clean and efficient renewable energy is a strategic target of vigorous development of all countries in the world, and wind energy is one of the important new energy sources developed by all countries as renewable energy. The offshore wind power generation is one of wind power utilization, is developed rapidly in recent years, has most advantages of onshore wind power generation, and has the advantages of large power generation amount, less use limitation, no land occupation and the like.

An offshore wind power generation unit foundation structure is a key structure for offshore wind power construction. But at present in the event of claims for offshore wind power projects, the problems associated with the single pile foundations account for 35%, most of which occur in deep sea areas. This is due to the fact that, to some extent, the construction side is overly confident, and the basic single-pile foundation is still adopted to reduce the cost, while the reliability and applicability are ignored. It can be seen that the conventional single-pile foundation structure cannot be applied to deep sea areas.

The major diameter single pile basis is the mainstream of offshore wind power basis, and construction convenience and economic benefits are better, but the single pile basis is generally suitable for the sea area that the depth of water is less than 25m, and along with the development gradually of coastal waters wind power resource, deep water sea area wind power development is tendency greatly, and the main following factor that exists that restricts the application of single pile basis to deep water sea area: the single pile foundation needs to have larger bearing capacity and anti-skid and anti-overturning stability; when the construction ship is used for pile sinking construction, the verticality of a single pile is difficult to control due to the influence of waves, sea wind and the like; the soil around the pile is seriously washed by the ocean, so that the stability is reduced and the inclination of the pile is promoted to cause accidents.

In the prior art, many people have improved the traditional single pile, for example, the chinese patent with application No. 201910633302.5 discloses an offshore wind turbine generator reinforced composite single pile foundation and a construction method, and the chinese patent with application No. 201810001208.3 discloses an offshore wind turbine composite single pile foundation and a construction method. The patent technologies make some improvements on the single pile foundation, which can bring certain effects, but the overall bearing capacity, the stability of skid resistance and overturn resistance, the scour resistance and other performances need to be further improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a single pile foundation of an offshore wind turbine with a skirt edge and a rib and a construction method thereof.

The invention provides an offshore wind turbine single pile foundation with a skirt edge and a rib, which comprises:

the pipe pile is a first steel hollow cylinder;

the rib plate is arranged on the outer side wall of the tubular pile and is a steel rib plate of a right-angled trapezoid rib plate, the lower bottom edge of the right-angled trapezoid rib plate is welded with the outer side wall of the tubular pile, the acute angle end of the right-angled trapezoid rib plate faces downwards, the right-angled trapezoid rib plate is distributed radially outwards along the outer side wall of the tubular pile, and the acute angle end of the right-angled trapezoid rib plate forms a conical part located on the outer side wall of the tubular pile;

the drum part is the second steel hollow cylinder, the drum part with pass through between the tubular pile the right trapezoid ribbed slab connects, wherein, the inner wall of drum part with the last base welding of right trapezoid ribbed slab, just the length of drum part with the length on last base of right trapezoid ribbed slab is the same.

Preferably, the offshore wind turbine mono-pile foundation with the skirt and the rib comprises: the conical cover body is used for dispersing water flow impact, the conical cover body is positioned above the cylindrical component, the small end of the conical cover body is connected to the outer side wall of the tubular pile, and the large end of the conical cover body is connected with the upper end of the cylindrical component; and the conical cover body, the cylindrical part and the tubular pile are connected in a smooth transition mode.

Preferably, a cavity is formed among the conical cover body, the cylindrical part and the tubular pile, the right-angle end of the right-angle trapezoidal rib plate is located in the cavity, and the acute-angle end of the right-angle trapezoidal rib plate is located below the cavity.

Preferably, through holes are formed in the right-angled trapezoidal rib plate and the conical cover body, so that the right-angled trapezoidal rib plate and the conical cover body form a communicating vessel.

Preferably, the right-angled trapezoidal rib plate is provided with at least one first through hole, and the first through hole penetrates through the thickness direction of the right-angled trapezoidal rib plate;

the conical cover body is at least provided with a second through hole, and the second through hole penetrates through the thickness direction of the conical cover body;

the right-angle trapezoidal rib plate and the conical cover body form a communicating vessel structure convenient for driving the pile body into the seabed through the first through hole and the second through hole.

Preferably, when the right-angled trapezoidal rib plate is provided with a plurality of first through holes, the plurality of first through holes are uniformly distributed along the length direction of the rib plate.

Preferably, when the conical cover body is provided with a plurality of second through holes, the second through holes are uniformly distributed along the axial direction of the conical cover body.

Preferably, the size of the acute angle end of the right-angle trapezoidal rib plate is adjusted according to the penetration resistance of the pile body driven into the seabed.

Preferably, a plurality of right trapezoid floor centers on the lower extreme circumference of tubular pile evenly sets up the lower extreme of tubular pile forms the toper portion.

The invention also provides a construction method of the offshore wind turbine single-pile foundation with the skirt edge and the ribs, which comprises the following steps:

the standard and integrated production of the tubular pile, the rib plate and the cylindrical component is completed, and the tubular pile, the rib plate and the cylindrical component are installed and welded on land to form an integrated single-pile foundation;

towing the integrated single-pile foundation to a sinking place, and carrying out sinking and leveling work;

driving the integrated single-pile foundation into the seabed through a pile clip, so that the cylindrical part of the single-pile foundation is semi-exposed in the seabed;

and throwing the anti-scour counter weights to the periphery of the integrated single-pile foundation, and finishing construction.

Compared with the prior art, the invention has at least one of the following beneficial effects:

the single-pile foundation is simple in structure and suitable for deep sea areas; the rib plates are arranged on the periphery of the tubular pile and are designed into the right-angled trapezoid rib plate structure, so that the horizontal bearing capacity of the pile body is improved, the displacement and bending moment of the pile body are reduced, and the verticality of a single pile during construction is ensured; the right-angle trapezoidal rib plates form a conical part at the lower end of the tubular pile, so that the pile-soil contact pressure is increased, the penetration resistance is reduced, and the construction difficulty is reduced; in addition, the external cylindrical component is connected with the tubular pile to form an integrated structure, so that the bearing capacity and the anti-skid and anti-overturning stability of the single pile foundation are improved; meanwhile, the cylindrical part is sleeved on the outer wall of the rib plate, the integrity of the rib plate is improved, the cylindrical part is used as the skirt edge of the whole single pile and is half exposed outside the seabed, water flow impact can be dispersed, scouring is avoided, and stability and scouring resistance are improved. The structure aims at the complex marine environment of the offshore wind turbine, has multiple effects, has the characteristics of low construction difficulty and strong geological condition adaptability, reduces the possibility of accidents caused by the influence of the complex marine environments such as waves, sea wind and the like on the offshore wind turbine, and has wide application prospect in the marine wind turbine.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic structural view of a single pile foundation of an offshore wind turbine including a skirt and a rib according to a preferred embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a schematic structural view of a single pile foundation of an offshore wind turbine including a skirt and a rib according to a preferred embodiment of the present invention;

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a top view of FIG. 4;

FIG. 7 is a schematic diagram of a construction state of a single pile foundation of an offshore wind turbine including a skirt and a rib according to a preferred embodiment of the present invention;

the scores in the figure are indicated as: 1 is a tubular pile, 2 is a ribbed plate, 3 is a cylindrical component and 4 is a seabed.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

Referring to fig. 1, the structural schematic diagram of a single pile foundation of an offshore wind turbine with a skirt and ribs of the present invention is shown in fig. 2, and the diagram includes a pipe pile 1, a rib plate 2 and a cylinder part 3, and the pipe pile 1, the rib plate 2 and the cylinder part 3 form an integrated structure. Preferably, the tube pile 1, the rib 2 and the cylindrical member 3 are made of steel. Tubular pile 1 is first steel hollow cylinder as the pile body on single pile basis, and first steel hollow cylinder's diameter and wall thickness can be selected according to operating condition.

Tubular pile 1's lateral wall is equipped with a plurality of floor 2, and this floor 2 is located tubular pile 1's bottom, floor 2 is the right trapezoid floor, can adopt welded connection with the lower base of right trapezoid floor and tubular pile 1's lateral wall, and the wholeness is better, and sets up the acute angle of right trapezoid floor downwards, makes tubular pile 1's tip constitute toper portion, can increase stake soil contact pressure, reduces the penetration resistance, does benefit to during the construction and inserts in the marine soil body. A plurality of right trapezoid floor evenly lay and outwards be radial distribution along tubular pile 1's lateral wall along tubular pile 1 circumference. A plurality of right angle trapezoidal floor distributes and sets up with tubular pile 1 is perpendicular. Through set up floor 2 around tubular pile 1, improve the horizontal bearing capacity of steel pile, reduce the displacement and the moment of flexure of pile body, the straightness that hangs down of single pile when ensureing to construct has improved single pile basis bearing capacity and anti-skidding antidumping stability.

The cylindrical part 3 is a second steel hollow cylinder, the cylindrical part 3 is sleeved on the right-angled trapezoid rib plates, and the cylindrical part 3 is connected with the tubular pile 1 through the right-angled trapezoid rib plates, wherein the inner wall of the cylindrical part 3 and the lower bottom edges of the right-angled trapezoid rib plates can be connected in a welding mode, and the integrity of the rib plates 2 can be improved by adopting the welding connection mode; and the height of the cylinder member 3 matches the size of the right-angled trapezoidal rib.

In the above embodiment, the inner wall of the cylindrical member 3 is integrally formed with the upper bottom edge of the rectangular rib; the lower bottom edge of the right trapezoid rib plate and the outer side wall of the tubular pile 1 can be integrally formed. During specific construction, the cylindrical component 3 is semi-exposed outside the seabed 4, and the sandstone is laid, so that the stability of the sandstone is improved. The cylinder member 3 may be made of a steel material. The relative position of the cylindrical part and the tubular pile is determined according to the required piling depth, the cylindrical part is driven into the seabed, and part of the cylindrical part is exposed out of the seabed surface.

The structure aims at the complex marine environment of the offshore wind turbine, has multiple effects and has wide application prospect in marine wind power. In the specific implementation, four or eight ribs 2 can be provided, and other numbers can be adopted. Referring to fig. 1 and 2, four ribs 2 are uniformly distributed on the outer side wall of the tubular pile 1. Referring to fig. 3 and 4, eight rib plates 2 are uniformly distributed on the outer side wall of the tubular pile 1.

As a preferred embodiment, on the basis of the above embodiment, the offshore wind turbine monopile foundation with a skirt and a rib further comprises: the conical cover body is positioned above the right-angled trapezoidal rib plate; the conical cover body is positioned above the cylindrical component 3, the small end of the conical cover body is connected to the outer side wall of the tubular pile 1, and the large end of the conical cover body is connected with the upper end of the cylindrical component 3. The connection among the conical cover body, the cylindrical part 3 and the tubular pile 1 is smooth transition.

A cavity is formed among the conical cover body, the cylindrical part 3 and the tubular pile 1, the right-angle end of the right-angle trapezoidal rib plate is positioned in the cavity, and the acute-angle end of the right-angle trapezoidal rib plate is positioned below the cavity. As shown in the figure, the upper part of the conical cover body is a circular open end, the inner wall of the circular open end of the conical cover body is connected with the outer side wall of the tubular pile 1 in a welding mode, the bottom of the conical cover body can be connected with the circumferential surface of the upper end of the cylindrical component 3 in a welding mode, the outer diameter of the bottom surface of the conical cover body is matched with the outer diameter of the cylindrical component 3, and the conical cover body and the cylindrical component can also be connected in a welding mode. The height of the conical cover body extending along the tubular pile 1 is generally less than the height of the cylindrical part 3 extending along the tubular pile 1. Preferably, the circular open end of the conical cover body and the outer side wall of the tubular pile 1 are integrally formed, and the bottom of the conical cover body and the circumferential surface of the upper end of the cylindrical part 3 are integrally formed. The conical cover body can be made of steel.

In other partially preferred embodiments, the right-angled trapezoidal rib has a first through hole, and the first through hole penetrates through the thickness direction of the right-angled trapezoidal rib. The conical cover body is uniformly provided with second through holes along the circumferential direction, the second through holes penetrate through the thickness direction of the conical cover body, and the right-angled trapezoidal rib plates and the conical cover body form a communicating vessel structure through the first through holes and the second through holes, so that steel piles can be conveniently driven into a seabed. The second through hole and the first through hole may have the same or different diameters. Preferably, the rib 2 is provided with a plurality of first through holes, which are uniformly distributed along the length direction of the rib 2. The second through holes are uniformly distributed on the conical cover body. During the process of sinking and driving the single-pile foundation into the seabed, seawater can be communicated through the first through hole and the second through hole, so that the marine scouring of soil bodies around the pile is reduced, the stability is improved, and the inclination of the pile is promoted to cause accidents.

In other preferred embodiments, the height of the right-angle trapezoidal rib is less than the height of the tubular pile 1, and can be adjusted according to practical situations, for example, the height (i.e. the length of the lower bottom) of the right-angle trapezoidal rib occupies 1/4-1/2 of the height of the tubular pile 1.

In the other part of the preferred embodiment, the right-angle end of the right-angle trapezoidal rib plate is connected with the tubular pile 1, and the upper ends of the right-angle trapezoidal rib plate and the cylindrical component 3 are flush; the acute angle of the acute angle end of the right-angled trapezoidal rib plate is adjusted according to the penetration resistance of the pile body into the seabed 4, generally, the smaller the acute angle is, the more favorable the penetration resistance is, but the smaller the acute angle is, the stability is influenced to a certain extent. The acute angle end of angle trapezoidal plate is lieing in 1 lower extreme of tubular pile and forms the toper portion, is favorable to inserting in the marine soil body, and trapezoidal floor 2 has increased stake soil contact pressure, reduces the penetration resistance.

In another embodiment, a construction method of a single pile foundation of an offshore wind turbine with a skirt and a rib is provided, which comprises the following steps:

standard and integrated production of the tubular pile, the rib plate and the cylindrical component is completed on land, and the tubular pile, the rib plate and the cylindrical component are installed and welded into a whole on land to form an integrated single-pile foundation and complete prefabrication of the single-pile foundation;

lifting the single-pile foundation, driving the integrated single-pile foundation into the seabed through the pile gripper, penetrating the lower end part of the single-pile foundation into the deep sea area below the seabed 4 by a certain depth, inserting the ribbed slab 2 of the single-pile foundation into the seabed 4, and exposing the cylindrical component 3 on the seabed 4, as shown in fig. 7, the verticality of the single-pile foundation needs to be ensured in the installation process.

And finally, throwing the anti-scour counter weights to the periphery of the foundation, and finishing construction.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims

1. The utility model provides a contain marine wind turbine single pile basis of shirt rim area rib which characterized in that includes:

the pipe pile is a first steel hollow cylinder;

the cylindrical part is a second steel hollow cylinder and is connected with the tubular pile through the right-angled trapezoid rib plate, the inner wall of the cylindrical part is welded with the upper bottom edge of the right-angled trapezoid rib plate, and the length of the cylindrical part is the same as that of the upper bottom edge of the right-angled trapezoid rib plate;

the conical cover body is used for dispersing water flow impact, the conical cover body is positioned above the cylindrical component, the small end of the conical cover body is connected to the outer side wall of the tubular pile, and the large end of the conical cover body is connected with the upper end of the cylindrical component; the conical cover body, the cylindrical part and the tubular pile are connected in a smooth transition manner;

a cavity is formed among the conical cover body, the cylindrical part and the tubular pile, the right-angle end of the right-angle trapezoidal rib plate is positioned in the cavity, and the acute-angle end of the right-angle trapezoidal rib plate is positioned below the cavity;

the right-angle trapezoidal rib plate is provided with a plurality of first through holes, and the first through holes penetrate through the thickness direction of the right-angle trapezoidal rib plate; a plurality of second through holes are formed in the conical cover body, and the second through holes penetrate through the conical cover body in the thickness direction; the right-angle trapezoidal rib plate and the conical cover body form a communicating vessel structure which is convenient for the pile body to be driven into the seabed through the first through hole and the second through hole;

the upper portion that the cone cover body is circular open end, the inner wall of circular open end with welded connection is adopted to the lateral wall of tubular pile, the bottom that the cone cover body with welded connection is adopted to the periphery of cylinder part upper end, just the external diameter of the bottom surface that the cone cover body was covered with the external diameter size phase-match of cylinder part, the cone cover body is followed highly being less than that the tubular pile extends the cylinder part is followed the height that the tubular pile extends.

2. The offshore wind turbine mono-pile foundation with the skirt and the rib of claim 1, wherein when the right-angle trapezoidal rib plate is provided with a plurality of first through holes, the plurality of first through holes are uniformly distributed along the length direction of the rib plate.

3. The offshore wind turbine mono-pile foundation with the skirt and the rib as recited in claim 1, wherein when the tapered cover body is provided with the second through holes, the second through holes are uniformly distributed along the axial direction of the tapered cover body.

4. The offshore wind turbine mono-pile foundation with the skirt and the rib as recited in any one of claims 1 to 3, wherein the acute angle end of the right-angle trapezoidal rib plate is adjusted according to the penetration resistance of the pile body into the seabed.

5. The offshore wind turbine single pile foundation with the skirt and the rib as recited in any one of claims 1 to 3, wherein a plurality of right-angled trapezoidal rib plates are uniformly arranged circumferentially around the lower end of the tubular pile, and the tapered portion is formed at the lower end of the tubular pile.

6. A construction method of a single pile foundation of an offshore wind turbine containing a skirt with ribs as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps: