CN109930624A - A kind of embedding petrographic province blower foundation of offshore wind farm and construction method - Google Patents

Abstract

The invention discloses a kind of embedding petrographic province blower foundation of offshore wind farm and construction method, blower foundation includes piling bar, jacket, transformational structure；Jacket is more, and more jackets are fixedly connected by horizontal brace or diagonal brace；Piling bar is inserted in jacket；The lower end of piling bar is provided with overlap joint stem, embedding along stem；Transformational structure is set to the top of jacket and piling bar.The construction method of above-mentioned blower foundation, including Prefabricated steel construction product, decentralization jacket, piling, installation temporary construction platform and equipment, embedding rock, remove temporary construction platform and transformational structure is installed etc..The present invention drives piles mode after may be implemented by installing jacket in advance, has the advantages that construction is simple, easy to operate, duty cycle is short, can avoid underwater operation；The factory floor machine-shaping by land of all steel constructions significantly avoids on-site assembly construction, has significantly saved construction period；Temporary construction platform installation is simple and convenient and reuses after can dismantling.

Description

Fan foundation and construction method for offshore wind power rock-socketed area

technical field

The invention relates to a fan foundation and a construction method, in particular to a fan foundation and a construction method in an offshore wind power rock-socketed area.

Background technique

With the gradual expansion of offshore wind energy development, rock-socketed construction in rock geology has gradually become a core issue in offshore wind energy development. The selection of the fan base is particularly critical.

At present, the foundation forms of rock-socketed wind turbines for offshore wind power mainly include high pile cap foundation and single pile foundation. Among them, the high pile cap foundation generally contains 6-8 inclined piles. After the inclined piles are fixed, the core column rock-socketing construction is carried out at the bottom of the pile, and the upper part is poured with concrete cap. The number of rock-socketed piles used in the foundation of the fan is large, which leads to a large workload of offshore hole cleaning, drilling, and rock-socketed construction of the bottom core column. In addition, the upper part needs to be installed with steel casing and concrete capping, which requires many procedures. , the construction efficiency is low, and because the piles are inclined, not only the drilling efficiency is low, but also a stable pile platform is generally required. The construction period is quite long, and the requirements for the offshore weather window period are high.

The diameter of the single pile foundation is generally larger. With the increase of water depth and fan, the maximum pile diameter can reach 8m. Due to the large diameter of the single pile and the deep burial depth, the diameter of the drilling rig is required to be large, resulting in high engineering cost, and the single pile foundation generally needs to be drilled twice for rock sockets, that is, one drilling, secondary reaming, and construction. The efficiency is very low, the construction period is long, and the weather window period is demanding. In addition, the monopile foundation also needs to set up a special offshore construction platform and fix the drilling rig for drilling, which has the disadvantages of long construction period, high cost and shallow water depth in the application sea area.

In order to reduce the cost of offshore wind turbine foundations, shorten the construction period, improve the safety of offshore construction, and adapt to the development requirements of wind farms in deep seas under rocky foundation conditions, it is urgent to propose a new type of wind turbine foundation for offshore wind power in rock-socketed areas. Construction method.

SUMMARY OF THE INVENTION

In order to solve the shortcomings of the above-mentioned technologies, the present invention provides a fan foundation and a construction method in an offshore wind power rock-socketed area.

In order to solve the above technical problems, the technical scheme adopted in the present invention is: a fan foundation for offshore wind power rock-socketed area, including steel piles, and also includes jackets, conversion structures, overlapping core columns, and embedded core columns; Roots, multiple jackets are fixedly connected by horizontal braces or diagonal braces;

The steel pile is inserted into the jacket, and its upper end is welded with the upper end of the jacket through the connecting plate; the length of the steel pile is greater than that of the jacket;

The lower end of the steel pile is provided with a lapped core column; the lower end of the lapped core column is provided with an embedded core column; the conversion structure is arranged on the top of the jacket and the steel pile.

Further, the conversion structure includes a main column, a supporting leg, and a transition cone; there are multiple supporting legs, and the plurality of supporting legs are arranged radially along the outer wall of the main column; the lower ends of the supporting legs are all fixed with transition cones; The lower end of the pipe is provided with a cone tip structure, and the transition cone tube is inserted into the top end of the steel pile through the cone tip structure.

Further, the steel piles are connected with the wind turbine tower through the conversion structure.

Further, both the lapped core column and the embedded core column are formed by using a steel cage as a skeleton, and are formed by pouring concrete inside and outside; the lapped core column is arranged at the inner lower end of the steel pile.

Further, the lower end of the jacket is provided with an anti-sinking plate, which is used to prevent the jacket from sinking too much due to its own weight during the installation process.

Further, a wedge block is welded on the inner wall of the jacket to limit the horizontal position of the steel pile.

Further, a temporary construction platform is erected on the upper end of the jacket and the steel pile.

Further, the jacket is vertical. Alternatively, the jacket is inclined, and its inclination is 7:1 to 12:1.

A construction method for a wind turbine foundation in an offshore wind power rock-socketed area, comprising the following steps:

a. Prefabricate steel cages for jackets, steel piles, transition structures, temporary construction platforms, lapped core columns and embedded core columns in the onshore factory workshop;

b. Lower the jacket to the seabed of the working sea area, and the settlement of the jacket can be effectively controlled due to the function of the anti-sinking plate;

c. Carry out piling operation, drive the steel piles through the jacket and drive them to the bottom of the soil layer;

d. After the piling is completed, the connecting plate is welded so that the steel pile and the jacket are connected as a whole;

e. Cut the top of the steel pile to be flush, then install a temporary construction platform for drilling rock sockets, and install rock socketing equipment on the temporary construction platform;

f. Drill holes into the bedrock layer below the soil layer along the steel pile, and multiple drilling rigs can operate at the same time; after drilling to a predetermined depth, lower the reinforcement cage along the steel pile into the hole of the bedrock layer and the soil layer and pour concrete, complete rock socketing;

g. After the rock-socketing construction is completed, remove the rock-socketing equipment and temporary construction platform;

h. Install the conversion structure and complete the fan foundation construction.

The invention can realize the post-piling method by pre-installing the jacket, and has the advantages of simple construction, convenient operation, short operation period, and avoidance of underwater operation; Assembly and construction significantly saves the construction period; the temporary construction platform is simple and convenient to install and can be disassembled and reused.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention.

Figure 2 is a schematic structural diagram of the connection between the steel pile and the jacket through the connecting plate.

FIG. 3 is an enlarged schematic view of the conversion structure.

FIG. 4 is a schematic structural diagram of the connection between the steel pile and the jacket through a wedge block.

FIG. 5 is a schematic diagram of the installation state of the jacket on the seabed of the working sea area.

FIG. 6 is a schematic diagram of a pile driving state.

FIG. 7 is a schematic diagram of the installation state of the temporary construction platform.

FIG. 8 is a schematic diagram of the state of the rock-socketing operation.

FIG. 9 is a schematic diagram showing the state of dismantling the temporary construction platform after the rock-socketing operation is completed.

FIG. 10 is a schematic diagram of the installation process of the conversion structure.

FIG. 11 is an overall structural diagram of the fan foundation after the conversion structure is installed.

In the figure: 1. Conversion structure; 2. Jacket; 3. Connecting plate; 4. Diagonal brace; 5. Anti-sinking plate; 6. Steel pile; 7. Lap core column; 8. Embedded core column; 9. Wedge block; 10. Transition cone pipe; 11. Temporary construction platform; 12. Main column; 13. Support leg; 14. Soil layer; 15. Bedrock layer.

Detailed ways

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

A fan foundation in an offshore wind power rock-socketed area shown in Figure 1-2 includes steel piles 6, jackets 2, transition structures 1, lapped core columns 7, and embedded core columns 8; the jackets 2 are multiple , a plurality of jackets are fixedly connected by horizontal braces or diagonal braces 4;

The steel pile 6 is inserted into the jacket 2, and its upper end is welded with the upper end of the jacket 2 through the connecting plate 3; the length of the steel pile 6 is greater than that of the jacket 2, which is convenient for being inserted into the rock-socketing area for rock-socketing effect ;

The lower end of the steel pile 6 is provided with a lapped core column 7; the lower end of the lapped core column 7 is provided with an embedded core column 8; overlap.

As shown in FIG. 3 , the conversion structure 1 includes a main column 12 , a support leg 13 , and a transition cone 10 ; the fan tower can be arranged on the upper end of the main column 12 ; the steel pile 6 is connected to the fan tower through the conversion structure 1 . There are multiple support legs 13, and the multiple support legs are arranged radially along the outer wall of the main column 12; the lower ends of the support legs 13 are fixedly provided with a transition cone tube 10; the lower end of the transition cone tube 10 is provided with a cone tip structure, and the transition cone The tube 10 is inserted into the top end of the steel pile 6 through the cone-tip structure.

Both the lapped core column 7 and the embedded core column 8 are formed by using a steel cage as a skeleton, and are formed by pouring concrete inside and outside;

The lower end of the jacket 2 is provided with an anti-sinking plate 5, which is used to prevent the jacket from sinking too much under the action of its own weight during the installation process.

As shown in FIG. 4 , a wedge block 9 is welded on the inner wall of the jacket 2 , which is only used to limit the horizontal position of the steel pile 6 without transmitting vertical force and bending moment.

A temporary construction platform 11 is erected on the upper ends of the jacket 2 and the steel pile 6 .

The jacket 2 is of a vertical type or an oblique type, and when it is an oblique type, its inclination is 7:1 to 12:1.

A construction method for a wind turbine foundation in an offshore wind power rock-socketed area, comprising the following steps:

a. The jacket 2, the steel pile 6, the transition structure 1, the temporary construction platform 11, the lapped core column 7 and the embedded core column 8 are prefabricated with steel cages in the onshore factory workshop;

b. Lower the jacket 2 to the seabed of the working sea area. Due to the function of the anti-sinking plate 5, the settlement of the jacket 2 is effectively controlled, as shown in Figure 5;

c. Carry out the piling operation, pass the steel pile 6 through the jacket 2 and drive it to the bottom end of the soil layer, as shown in Figure 6;

d. After the piling is completed, the connecting plate 3 is welded, so that the steel pile 6 is connected with the jacket 2 as a whole;

e, cut the top end of the steel pile 6 to be flush, then install the temporary construction platform 11 (shown in Figure 7) for drilling rock-socketed, and install the rock-socketing equipment on the temporary construction platform 11;

f. Drill holes into the bedrock layer below the soil layer along the steel pile 6, and multiple drilling rigs can operate at the same time; after drilling to a predetermined depth, lower the reinforcement cage along the steel pile 6 to the hole in the bedrock layer and the soil layer and cast concrete , to complete the rock-socketing effect (as shown in Figure 8);

g. After the rock-socketing construction is completed, remove the rock-socketing equipment and the temporary construction platform 11 (as shown in Figure 9);

h. Install the conversion structure 1 and complete the fan foundation construction (as shown in Figure 10 and Figure 11).

Compared with the prior art, the present invention has the following advantages:

1) Compared with the current common first piling method, the present invention can realize piling after, that is, install the jacket before piling and rock socketing, and has the advantages of simple and convenient construction, short cycle, and avoiding underwater operation;

2) All steel structures are processed and formed in the onshore factory workshop, which greatly avoids on-site assembly and construction, and significantly saves the construction period;

3) The connection between the jacket and the fan tower is realized through the upper conversion structure, and the lower end of the conversion structure has a cone-tip structure, which can play a guiding role during connection, and is convenient for welding and simple operation;

4) The jacket and the steel pile are welded together by connecting plates, and a wedge block is arranged between the jacket and the steel pile, which can realize the horizontal limit of the steel pile and avoid the traditional grouting operation;

5) The lower end of the jacket is provided with an anti-sinking plate, which can prevent the jacket from sinking too much due to its own weight during the installation process;

6) A temporary construction platform can be set at the top of the jacket for rock-socketing, which reduces the workload of setting up a rock-socketed platform at sea by traditional methods; in addition, after the rock-socketing is completed, the temporary construction platform can be removed and transferred reuse.

The above-mentioned embodiments are not intended to limit the present invention, and the present invention is not limited to the above-mentioned examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the technical solutions of the present invention also belong to the present invention. the scope of protection of the invention.

Claims (10)

1. a kind of embedding petrographic province blower foundation of offshore wind farm, including piling bar (6), it is characterised in that: further include jacket (2), conversion Structure (1) overlaps stem (7), is embedding along stem (8)；The jacket (2) is more, and more jackets are by horizontal brace or tiltedly Support (4) is fixedly connected；

The piling bar (6) is inserted in jacket (2), and the upper end is mutually welded by connecting plate (3) and the upper end of jacket (2)； The length of the piling bar (6) is greater than the length of jacket (2)；

The lower end of the piling bar (6) is provided with overlap joint stem (7)；The lower end of overlap joint stem (7) is provided with embedding along stem (8)；The transformational structure (1) is set to the top of jacket and piling bar.

2. the embedding petrographic province blower foundation of offshore wind farm according to claim 1, it is characterised in that: transformational structure (1) packet Include head tree (12), supporting leg (13), transition Taper Pipe (10)；The supporting leg (13) is more, and more supporting legs are along head tree (12) outer wall radially arranges；The lower end of the supporting leg (13) is fixedly installed transition Taper Pipe (10)；The transition The lower end of Taper Pipe (10) is provided with cone structure, and transition Taper Pipe (10) is inserted in the top of piling bar (6) by cone structure.

3. the embedding petrographic province blower foundation of offshore wind farm according to claim 2, it is characterised in that: the piling bar (6) is by turning Structure (1) is changed to be connected with blower fan tower barrel.

4. the embedding petrographic province blower foundation of offshore wind farm according to claim 1 or 2, it is characterised in that: the overlap joint stem (7), it is embedding along stem (8) using steel reinforcement cage as skeleton, inside and outside casting concrete and form；The overlap joint stem (7) is set to steel The interior lower end of stake (6).

5. the embedding petrographic province blower foundation of offshore wind farm according to claim 4, it is characterised in that: under the jacket (2) End is provided with mud mat (5), for preventing jacket in installation process excessive because settling under Gravitative Loads.

6. the embedding petrographic province blower foundation of offshore wind farm according to claim 5, it is characterised in that: the jacket (2) it is interior Welding is provided with wedge (9) on wall, for carrying out Horizontal limiting to piling bar (6).

7. the embedding petrographic province blower foundation of offshore wind farm according to claim 6, it is characterised in that: the jacket (2) and steel The upper end frame of stake (6) is equipped with temporary construction platform (11).

8. the embedding petrographic province blower foundation of offshore wind farm according to claim 7, it is characterised in that: the jacket (2) is straight It is vertical.

9. the embedding petrographic province blower foundation of offshore wind farm according to claim 7, it is characterised in that: the jacket (2) is oblique Formula, gradient are 7:1~12:1.

10. a kind of construction method of the embedding petrographic province blower foundation of offshore wind farm as claimed in claim 7, it is characterised in that: described Method the following steps are included:

A, by land factory floor to jacket (2), piling bar (6), transformational structure (1), temporary construction platform (11), overlap joint stem (7) and it is embedding pre-formed with steel reinforcement cage along stem (8)；

B, jacket (2) are transferred to working sea area sea bed, because playing the role of mud mat (5), the sedimentation of jacket (2) is obtained Effectively control；

C, piling work is carried out, piling bar (6) are passed through into jacket (2) and is squeezed into the bottom end of soil layer；

D, after piling, welded connecting plate (3), so that piling bar (6) is connected as one with jacket (2)；

E, the top of piling bar (6) is cut to concordantly, then installation drills embedding rock with temporary construction platform (11), and applies temporarily Embedding rock equipment is installed on work platform (11)；

F, along piling bar (6) to below soil layer horizon d punch, can more bench drill machines operate simultaneously；After punching to predetermined depth, Steel reinforcement cage and casting concrete are transferred into the hole of horizon d and soil layer along piling bar (6), completes embedding rock effect；

G, after embedding rock construction, embedding rock equipment and temporary construction platform (11) are removed；

H, transformational structure (1) is installed, completes blower foundation construction.