CN112127383A - Offshore wind power foundation with separated bins in barrel top dense beam barrel and single-column negative pressure barrel - Google Patents

Abstract

The invention relates to an offshore wind power foundation with a bin-dividing single-column negative pressure cylinder in a dense beam cylinder at the top of a cylinder, which comprises a single column and a negative pressure cylinder, wherein the bottom of the single column is connected with the top plate of the negative pressure cylinder through a T-shaped ring beam, and an inclined support is arranged between the single column and the negative pressure cylinder; the inclined supports comprise a plurality of inclined columns, vertical plates and horizontal beams which are uniformly arranged along the circumferential direction, and the inclined columns, the vertical plates and the horizontal beams are connected in a pairwise mode through straight sections in an intersecting or arc transition mode; be equipped with the girder between the adjacent horizontal beam, the girder is along radially welding on the roof, is equipped with the secondary beam between girder and the horizontal beam, and the secondary beam is arranged along the roof hoop. The inclined support and the negative pressure cylinder top plate are connected to form a whole, and the load borne by the single column is effectively transmitted to the negative pressure cylinder. The invention combines the advantages of simple construction of single pile foundation, definite force transfer, good stability of cylindrical foundation, convenient installation on the sea and the like, and solves the problems that the traditional pile type foundation needs large equipment for piling at the sea, and the rock-socketed construction has large difficulty, long construction period, high construction cost and the like.

Description

Offshore wind power foundation of single-column negative pressure cylinder with single-column negative pressure cylinder

technical field

The invention relates to an offshore wind power base structure, in particular to an offshore wind power base of a single-column negative pressure cylinder with a single-column negative pressure cylinder in a dense beam at the top of a cylinder.

Background technique

Due to the geological conditions such as silt, silt soil, clay, sand and so on in the offshore area of my country, in order to meet the requirements of foundation bearing capacity and foundation deformation, pile-type foundations such as single pile and jacket are usually used, which requires large hoisting ships and piling. Ship-assisted construction, through hammering, drive the bottom of the pile into a better bearing layer. This traditional pile foundation has high cost and long construction period. For example, in Fujian, Guangdong and other sea areas, it is mostly a rock foundation with a shallow cover. , If the pile foundation needs to be rock-socketed construction, it is difficult, the construction period is long, and the project cost is high.

With the increase of the single-unit capacity of offshore wind turbines, the use of traditional monopiles and jacket foundations needs to increase the size and material consumption of the foundations. Large-diameter monopiles and rock sockets are limited by large offshore construction equipment and become insurmountable problems. The risks are high, the construction period is long, and the project cost is high.

With the continuous advancement of technology, in order to solve the above problems, the industry has carried out continuous exploration. like:

The composite cylindrical foundation (patents CN107761755A, CN106759445) has been used in the negative pressure sinking installation method of offshore wind power and cylindrical foundations (patent CN105926661A), which can avoid offshore piling and rock-socketing operations, but the foundation is suitable for shallow water depth and weighs up to 5000 tons, the available construction equipment resources are few, and it is difficult to manufacture, transport and hoist.

An offshore wind power composite cylindrical foundation (patent CN207567801U) can avoid offshore piling and rock-socketing operations, but the stress concentration at the connection between the single column in the middle of the foundation and the steel pipe diagonal brace is very obvious, which is not conducive to the fatigue and punching of the foundation, and consumes steel. Large quantity; reinforced concrete needs to be installed on the top plate of the cylinder, and concrete needs to be poured into the interior of the diagonal bracing. The construction process is many and complicated, and the weight of the foundation is large, which is not conducive to the production, transportation and hoisting of the foundation; the project cost is high.

The offshore fan monopile-suction cylinder combined foundation and its construction method (patent CN 110016930A) can avoid offshore piling and rock-socketing operations. The connection of the cylinder is too weak, the roof of the cylinder has no effective support system, and the rigidity is weak, which cannot effectively transmit the fan load borne by the single pile in the middle to the cylinder.

A connection tool for single-column and composite cylinder combined foundation (CN 110607802 A) can avoid offshore piling and rock-socketing operations, only the upper ring plate is provided at the connection between the foundation diagonal brace and the middle single column, where the stress is concentrated It will be obvious, unfavorable for fatigue, and large steel consumption; the diameter of the single column in the middle extends into the cylinder to form a middle compartment, because its diameter is smaller than that of the cylinder, it is easy to produce a soil plug effect during the negative pressure sinking process, which may cause the sinking failure; due to the small diameter of the single column in the middle, the length of other sub-silo boards in the cylinder is greatly increased, and buckling damage is likely to occur during transportation and sinking; the project cost is high.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides an offshore wind power foundation of a single-column negative-pressure cylinder with a single-column sub-silo and a dense beam at the top of the cylinder.

The technical scheme adopted in the present invention is as follows: an offshore wind power foundation for offshore wind power with a single-column negative pressure cylinder of a single column in a sub-silo and a dense beam at the top of the cylinder, comprising a single column arranged vertically and a negative pressure cylinder arranged at the bottom of the single column, and the top of the single column is provided with a negative pressure cylinder. It is connected with the bottom flange of the fan, and is characterized in that: the bottom of the single column is connected with the top plate of the negative pressure cylinder through a T-ring beam, and an oblique support is provided between the single column and the negative pressure cylinder;

The oblique support includes a plurality of oblique columns, vertical plates and horizontal beams uniformly arranged in the circumferential direction, and the upper part of the oblique columns is connected by a circular ring plate and a single column; the horizontal beams penetrate radially through the negative pressure cylinder , connected with the top plate of the negative pressure cylinder; the vertical plate is connected with the single pile along the height direction of the single pile, and the inclined columns, the vertical plates and the horizontal beams are connected by a straight section or arc transition; adjacent to the horizontal There is a main beam between the beams, the main beam is welded on the top plate along the radial direction, one end is welded on the T-ring beam, and the other end is welded on the outer cylinder wall of the negative pressure cylinder; the main beam and the horizontal beam A secondary beam is arranged therebetween, and the secondary beam is arranged circumferentially along the top plate. The oblique support is connected with the top plate of the negative pressure cylinder to form a whole, which effectively transmits the load borne by the single column to the negative pressure cylinder.

Preferably, the cross-section of the inclined column is I-shaped, box-shaped or cross-shaped, and the height is 1.0-5m; the cross-section of the vertical plate is T-shaped; the cross-section of the horizontal beam is T-shaped, and the height is 0.3-2m.

Preferably, the inner diameter of the connecting ring plate is equal to the outer diameter of the single column, and the connection between the connecting ring plate and the upper part of the inclined column is connected by a straight section or an arc transition.

Preferably, the cross-sections of the main beam and the secondary beam are I-shaped or T-shaped, and the height is 0.3-2 m.

Preferably, the negative pressure cylinder includes a top plate, an outer cylinder wall, an outer sub-silo plate and an inner sub-silo plate, and the outer and inner sub-silo plates, the top plate and the outer cylinder wall enclose a plurality of compartments.

Further, the top plate is provided with a drain and exhaust valve which is in one-to-one correspondence with the cabins.

Further, the diameter of the drainage and exhaust valve is 20mm˜300mm.

Preferably, the single column has an equal diameter circular section.

Preferably, gravel and concrete are laid on the top plate of the negative pressure cylinder; or the single column is filled with water to increase the weight of the foundation and facilitate the sinking of the foundation.

The beneficial effects obtained by the present invention are:

1. The horizontal beam at the bottom of the oblique support runs through the top of the cylinder. The top of the cylinder adopts a dense beam structure. The main beam and the secondary beam are set to shorten the calculation span of the top plate of the cylinder. , to increase the fundamental frequency.

2. The single column does not extend into the cylinder, and the bottom is connected to the top plate of the cylinder through a T-ring beam. The middle part of the cylinder adopts a polygonal or circular cabin with a larger space, and the compartments in the cylinder are more uniform, and soil will not be formed during the sinking process. At the same time, it can reduce the calculated length of other sub-silo plates in the cylinder, and enhance the ability to resist buckling instability. The thickness of the sub-silo plates is reduced from 35mm to 20mm, reducing steel consumption.

Taking an offshore wind power project in the sea area of Guangdong as the calculation background, the wind power foundation of the present invention can save more than 30% of the steel consumption compared with the existing wind power foundation, and at the same time, it can reduce the lifting weight level of the offshore floating crane construction ship and reduce the usage cost of construction equipment. , comprehensively considering the technology of the present invention, the cost of the basic project can be reduced by more than 25%.

To sum up, the wind power foundation of the present invention can be applied to a water depth of 5-50 m, has a simple structure and is convenient to manufacture, can avoid offshore piling and rock-socketing operations, and can shorten the construction period; less steel consumption, light weight, and relatively high requirements for offshore construction equipment. Lower, which can reduce the cost of basic engineering by more than 25%.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the elevation view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is the structural schematic diagram of oblique support;

Fig. 5 is the elevation view of Fig. 4;

Fig. 6 is a schematic diagram of the distribution of the roof beam system of the negative pressure cylinder;

Fig. 7 is a schematic diagram of the structure of some warehouses in the negative pressure cylinder;

Reference signs: 1. Single column; 2. Diagonal bracing system; 3. Negative pressure cylinder (a, top plate; b, outer cylinder wall; c, outer sub-silo board; d, inner sub-silo board); 4. Connecting ring Plate; 5. T-ring beam; 6. Inclined column; 7. Vertical plate; 8. Horizontal beam; 9. Arc transition; 10. Main beam; 11. Secondary beam; 12. Drain and exhaust valve; 13. Horizontal Beam intersection transition connection member; 14. Thick-walled steel pipe; 15. Solid casting.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-7, a single-column negative-pressure cylinder offshore wind power foundation of the present invention includes a single-column 1 and a negative-pressure cylinder 3, the single-column 1 is vertically arranged, and the single-column 1 The top is flanged to the bottom of the fan, and the bottom is fixedly connected to the top plate a of the negative pressure cylinder 3 . The single column 1 is fixedly connected to the negative pressure cylinder 3 through the oblique support 2, and the oblique support 2 is fixedly connected to the top plate a of the negative pressure cylinder 3 to form a whole, which effectively transmits the load borne by the single column 1 to the negative pressure cylinder 3. The present invention utilizes the negative pressure system to discharge the water and gas in the negative pressure cylinder 3 to form a negative pressure, the foundation is sunk into the topsoil, and the top of the negative pressure cylinder 3 is in contact with the seabed surface. The soil layer can also be cleared of a certain depth of soft soil first, and then the foundation is installed. The invention combines the advantages of simple construction of a single pile foundation, clear force transmission, good stability of the cylindrical foundation, and convenient installation at sea. The foundation requires large-scale equipment for offshore piling operations and rock-socketed construction is difficult, long construction period and high cost.

In this embodiment, the single column 1 is a steel pipe, which is rolled and welded by a steel pipe of equal section, with a diameter of 5 to 20 m and a wall thickness of 30 to 200 mm. The diameter of the upper part matches the diameter of the bottom of the tower. 2 Welding, the bottom is welded with the top plate a of the negative pressure cylinder 3 through the T-ring beam 9.

2-5, in this embodiment, the inclined support 2 includes a plurality of inclined columns 6, vertical plates 7 and horizontal beams 8 evenly arranged in the circumferential direction, and a single inclined column 6 and the corresponding vertical plates 7 and horizontal beams 8 The beams 8 are connected by arc transitions 9 to form a triangular-like structure; a plurality of triangular-like structures are connected to each other by the horizontal beams 8 to form a hollow diagonal bracing system, and the horizontal beams 8 are connected by horizontal beams. Intersecting transition connection members 13 (solid casting 15 or thick wall steel pipe 14) transition connection. The upper part of the inclined column 6 is fixedly connected to the single column 1 through the circular connecting ring plate 4, and the bottom end of the inclined column 6 can either be arranged on the edge of the top plate a of the negative pressure cylinder 3, or can be retracted, and is arranged on the diameter of the top plate a of the negative pressure cylinder 3. The horizontal beam 8 penetrates radially through the negative pressure cylinder 3 and is fixedly connected to the top plate a of the negative pressure cylinder 3; the vertical plate 7 is connected to the single pile 1 along the height direction of the single pile 1. In this embodiment, the inclined columns 6 are H-shaped steels with a height of 1.0-5 m; the horizontal beams 14 are H-shaped steels with a height of 0.3-2 m.

3-6, in this embodiment, a main beam 10 is provided between adjacent horizontal beams 8, the main beam 10 is welded on the top plate a along the radial direction, and one end of the main beam 10 is welded on the T-ring beam 5, The other end is welded on the outer cylinder wall b of the negative pressure cylinder 3; a plurality of secondary beams 11 are arranged between the main beam 10 and the horizontal beam 8, and the secondary beams 11 are arranged circumferentially along the top plate a, and the same main beam 10 and the horizontal beam 8 The distance between two adjacent secondary beams 11 is 0.5-4.0m. The main beam 11 and the secondary beam 10 are T-shaped steels with a height of 0.3 to 2 m. The main beam 10 , the secondary beam 11 and the horizontal beam 8 are fixedly connected to each other to form the top beam system of the negative pressure cylinder 3 .

In this embodiment, the connecting ring plate 4 and the inclined column 6 are connected by a straight section or arc transition, and the connecting ring plate 4 is welded to the top of the inclined column 6 along the circumferential direction. production.

In conjunction with Fig. 7, in this embodiment, the negative pressure cylinder 3 includes a top plate a, an outer cylinder wall b, an outer sub-silo board c and an inner sub-silo board d, the outer sub-silo board c and the inner sub-silo board d and the top plate a and the outer sub-silo board d. The cylinder wall b is enclosed into a plurality of compartments (5 to 11 compartments). The outer cylinder wall b is rolled and welded by steel pipes, the diameter of the cylinder is 10-50m, and the cylinder height is 5-30m; the outer silo plate c and the inner silo plate d are made of steel plates with a thickness of 10-60mm, which are welded to the outer cylinder. Inside the wall b, the inside of the negative pressure cylinder 3 is divided into 7 compartments; the top plate a is composed of a plurality of steel plates, which are welded to the outer sub-silo board c, the inner sub-silo board d and the top of the outer cylinder wall b to form the negative pressure cylinder 3, The top plate a is provided with a drainage and exhaust valve 12 that communicates with each cabin in a one-to-one correspondence.

The construction method of the above foundation includes the following steps:

a. The factory completes the basic prefabrication;

The basic prefab steps are as follows:

(1) A single column 1 is formed by rolling and welding a steel pipe of equal section;

(2) The inclined column 6 is H-shaped steel, the vertical plate 7 is T-shaped steel, the horizontal beam 8 is T-shaped steel, and the intersection of the horizontal beam 8 is connected by a solid casting or thick-walled steel pipe 14, and the welding points are scattered. The plate 7 and the horizontal beam 8 are connected by the arc transition 9 to form the oblique support 2;

(3) The outer cylinder wall b is rolled and welded by steel pipes, the outer sub-silo plate c and the inner sub-silo plate d are composed of steel plates and welded on the inner side of the outer cylinder wall b, and the inside of the negative pressure cylinder 3 is divided into 7 compartments, The top plate a is composed of a plurality of steel plates, which are welded to the outer sub-silo plate c, the inner sub-silo plate d and the top of the outer cylinder wall b to form a negative pressure cylinder 3;

(4), the connecting ring plate 4 is welded with the top of the inclined column 6 along the circumferential direction;

(5), hoist the oblique support 2 system to the top of the negative pressure cylinder 3 and weld it to the top plate a;

(6), the bottom T-ring beam 9 is welded with the top plate a;

(7), the single column 1 passes through the reserved hole in the middle of the inclined support 2, the bottom is welded with the T-ring beam 9, and the middle is welded with the inclined column 6 and the connecting ring plate 4;

(8) An exhaust and drain valve 12 is provided at the opening corresponding to the roof a and each cabin;

b. The foundation is transported to the designated installation site by barge or floating;

c. Lift the foundation off the barge by the floating crane (floating by discharging the water and gas in the negative pressure cylinder) and sink it to the seabed surface;

d. It sinks to a certain depth below the seabed by the dead weight of the foundation;

e. By discharging the water and gas in the negative pressure cylinder, a downward negative pressure is formed, and the foundation sinks the top surface of the cylinder to be in close contact with the seabed surface through negative pressure sinking. Negative pressure controls the installation slope of the foundation within a reasonable range.

The basic principles and main structural features of the present invention have been shown and described above. The present invention is not limited by the above examples, and without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. An offshore wind power foundation of a single-column negative pressure cylinder with a single-column negative pressure cylinder in a sub-silo at the top of a dense beam and a cylinder, comprising a single-column (1) arranged vertically and a negative-pressure cylinder (3) arranged at the bottom of the single-column (1), the The top of the single column (1) is flanged to the bottom of the fan. (1) An inclined support (2) is provided between the negative pressure cylinder (3); The oblique support (2) includes a plurality of oblique columns (6), vertical plates (7) and horizontal beams (8) uniformly arranged along the circumferential direction, and the upper part of the oblique columns (6) passes through the circular annular plate and the single beam. The column (1) is connected; the horizontal beam (8) penetrates radially along the negative pressure cylinder (3), and is connected with the top plate (a) of the negative pressure cylinder (3); the vertical plate (7) is along the single pile (1) ) is connected to the single pile (1) in the height direction, and the inclined columns (6), the vertical plates (7) and the horizontal beams (8) are connected by straight sections or arc transitions; the adjacent horizontal beams ( 8) There is a main beam (10) between, the main beam (10) is welded on the top plate (a) along the radial direction, one end is welded to the T-ring beam (5), and the other end is welded to the negative pressure cylinder (3) on the outer cylinder wall (b); a secondary beam (11) is arranged between the main beam (10) and the horizontal beam (8), and the secondary beam (11) is circumferentially arranged along the top plate (a). ; The inner diameter of the connecting ring plate (4) is equal to the outer diameter of the single column (1), and the upper connecting part of the connecting ring plate (4) and the inclined column (6) is intersected by a straight section or connected by a circular arc transition; The negative pressure cylinder (3) comprises a top plate (a), an outer cylinder wall (b), an outer sub-silo board (c) and an inner sub-silo board (d), the outer sub-silo board (c) and the inner sub-silo The plate (d), the top plate (a) and the outer cylinder wall (b) are enclosed to form a plurality of compartments; the top plate (a) is provided with a drain and exhaust valve (12) that communicates with the compartments in a one-to-one correspondence. 2. The single-column negative pressure cylinder offshore wind power foundation of the single-column negative pressure cylinder of the top of the cylinder according to claim 1, characterized in that: the cross-section of the inclined column (6) is I-shaped, box-shaped or cross-shaped, and the height The cross-section of the vertical plate (7) is T-shaped; the cross-section of the horizontal beam (8) is T-shaped, and the height is 0.3-2m. 3. The offshore wind power foundation of single-column negative pressure cylinder with single-column negative pressure cylinders in a single-column negative pressure cylinder at the top of the cylinder according to claim 1, characterized in that: the cross-section of the main beam (10) and the secondary beam (11) are I-shaped or T-shaped Type, height is 0.3 ~ 2m. 4 . The offshore wind power foundation of single-column negative pressure cylinders with single-column negative pressure cylinders on top of dense beams and cylinders according to claim 1 , wherein the diameter of the drainage and exhaust valve ( 12 ) is 20mm to 300mm. 5 . 5 . The single-column negative pressure cylinder offshore wind power foundation according to claim 1 , wherein the single-column (1) has an equal-diameter circular section. 6. The single-column negative pressure cylinder offshore wind power foundation of claim 1, characterized in that: gravel and concrete are laid on the top plate (a); or the single-column (a). 1) Fill with water.

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