CN112627221B

CN112627221B - A prestressed hollow sandwich steel tube concrete lattice hybrid jacket

Info

Publication number: CN112627221B
Application number: CN202011231959.8A
Authority: CN
Inventors: 王宇航; 仇逍逸; 周绪红; 王滨; 高山
Original assignee: Chongqing University; PowerChina Huadong Engineering Corp Ltd
Current assignee: Chongqing University; PowerChina Huadong Engineering Corp Ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2025-09-12
Anticipated expiration: 2040-11-06
Also published as: CN112627221A

Abstract

The present invention discloses a prestressed hollow sandwich steel tube concrete lattice hybrid conductor frame, which relates to the field of offshore wind power generation technology. The system consists of a wind turbine, a steel tower, a switching device, a lattice conductor frame and steel piles. The corner columns of the lattice conductor frame are connected to the steel piles by flanges; the switching device is arranged on the top of the conductor frame; the steel tower and the upper part of the switching device are connected by flanges; the wind turbine is arranged on the steel tower; the lattice conductor frame can be triangular or quadrilateral, and the corner columns are all made of prestressed hollow sandwich steel tube concrete; the diagonal rods in the lattice conductor frame are made of ordinary steel pipes, and the cross nodes are poured with concrete. The main components of the lattice conductor frame are made of hollow sandwich steel tube concrete and ordinary steel pipes, which reduces the amount of steel and concrete, and applies continuous prestressing to the main supporting rods, which can improve the tensile performance of the structure and prevent concrete cracking. It is a new form of offshore wind power conductor frame.

Description

Prestressed hollow sandwich steel pipe concrete lattice type mixed jacket

Technical Field

The invention relates to the technical field of offshore wind power generation.

Background

Wind power has recently been attracting attention as a clean energy source. Compared with the common wind power, the offshore wind power has the remarkable advantages of larger wind speed, more stable operation and longer available time, and the offshore wind power plant is close to a large and medium-sized city with dense population and huge power consumption, so the offshore wind power plant becomes blue sea in the wind power industry and has huge potential.

The duct frame type fan foundation is a foundation form which is used more by the current offshore wind power structure, and can be applied to the fields of large fans and deep sea. The foundation of the offshore wind power structure not only bears hydrodynamic load during operation, but also can bear long-term action of pneumatic load, and frequent alternating stress in the structure can possibly cause fatigue damage of the nodes. The traditional jacket adopts a lattice type steel pipe jacket, has high requirements on positioning and horizontal precision, and is difficult to level. The on-site assembling, grouting and hoisting periods are too long, the underwater grouting quality requirement is high, and the difficulty in controlling the construction process and design parameters is high.

Therefore, in order to effectively utilize abundant offshore wind power resources in China, simplify engineering implementation procedures and processes, improve construction quality, shorten installation and construction time, reduce fatigue damage at nodes, and develop jacket forms with optimal performance, cost and quality by improving the structural form of the traditional jacket.

Disclosure of Invention

The invention comprehensively provides a prestressed hollow sandwich steel pipe concrete lattice type mixed jacket, wherein the upper part is a steel tower cylinder, the lower part is a lattice type jacket, and the wind load and the wave load on the jacket are obviously reduced while the size of a component is reduced. Each rod piece in the lattice jacket mainly bears axial force, and the strength of the material is fully exerted. The corner posts of the lattice jacket adopt prestressed hollow sandwich steel pipe concrete, the consumption of steel and concrete is reduced while the rigidity is increased, the weight of each component is reduced, the transportation and the hoisting are convenient, the sandwich concrete part is provided with pretensioning prestressed tendons, the whole tensioning is carried out along the height, and the stability and the tensile property of the structure are improved. And the diagonal support member adopts a crossed node to pour a concrete steel pipe, so that the fatigue performance of the node is improved. The structure is simple, the vertical and the overall stability are good, and the fan jacket is a brand new fan jacket form. The structural system is all built in an assembled mode, and all components are produced in engineering or on-site standardized mode, so that the construction efficiency is obviously improved, the construction quality is ensured, and the construction measure cost is reduced.

The technical scheme of the invention is as follows:

The structure comprises a fan, a steel tower barrel, a switching device, a lattice type jacket and a steel pile. The steel pile is positioned in advance, the pile is sunk, the stiffening flange is arranged on the upper portion of the pile, the corner posts of the lattice type jacket are connected with the steel pile through bolts, the top of the lattice type jacket is connected with the switching device, the attachment device is connected with the steel tower, and the steel tower is connected with the fan.

The middle corner column of the lattice jacket adopts prestressed hollow interlayer steel pipe concrete, and the interlayer concrete part is provided with pretensioned prestressing tendons. The diagonal rod adopts ordinary steel pipe, fills concrete in the intersection node department, and diagonal rod tip is opened the hole and is connected with steel pipe run-through in the corner post, and the junction sets up trompil ring baffle and vertical stiffening rib, prestressing tendons pass in the hole.

The switching device is 1 conical combined shell. The switching device is prefabricated in the mill and consists of an outer layer steel plate, an inner layer steel plate and concrete, wherein studs are welded at certain intervals on the inner side of the outer layer steel plate and the outer side of the inner layer steel plate, and then the concrete is poured. The concrete may be ordinary concrete or lightweight aggregate concrete. The upper part and the lower part are respectively connected with the tower barrel and the jacket through flanges.

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

(1) The jacket adopts multi-gasket flange connection with the steel pile, can adjust the horizontal deviation that produces when sinking the stake, improves on-the-spot efficiency of construction.

(2) All components are prefabricated in advance in factories and are directly assembled on site, so that the construction efficiency is obviously improved, the construction quality is ensured, and the construction measure cost is reduced. The components are connected by adopting dry connection, the construction process is simple and convenient, the construction period is shortened, and the environmental pollution is less.

(3) And each rod piece in the lattice jacket adopts standardized size, so that the production and processing efficiency is improved. The structure is simple and convenient to install. The prestressed hollow sandwich steel pipe concrete is adopted, the whole section of the steel pipe concrete is pressed by the prestress, the steel pipe forms a constraint effect on the concrete, and the strength and the ductility of the concrete are improved. The part of the cross joint is filled with concrete, so that the fatigue performance of the joint can be effectively improved, the fatigue life is prolonged, the self weight is less increased, and the material is saved.

(4) And the pretensioning method is adopted to stretch the prestressed tendons, an anchor is not needed, and the site construction efficiency is improved.

Drawings

FIG. 1 is an overall schematic of the present invention;

FIG. 2 is a schematic illustration of a multi-gasket flange connection;

FIG. 3 is a schematic diagram of a lattice jacket;

FIG. 4 is a schematic view of diagonal rod crossover nodes;

FIG. 5 is a schematic view of a corner post connection node;

FIG. 6 is a schematic view of a ring separator;

FIG. 7 is a schematic diagram of a switching device;

In the figure, a 1-fan, a 2-steel tower cylinder, a 3-switching device, a 4-lattice jacket, a 5-steel pile, a 6-corner column, a 7-diagonal rod, a 10-gasket, 11-prestressed tendons, 13-ring separators, 14-inner steel pipes, 15-outer steel pipes, 16-inner steel plates, 17-outer steel plates and 20-corbels are arranged.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, a prestressed hollow sandwich steel pipe concrete lattice type mixed jacket relates to the technical field of offshore wind power generation. The system comprises a fan (1), a steel tower (2), a switching device (3), a lattice jacket (4) and a steel pile (5). The steel pile (5) is positioned and sunk in advance, a corner post (6) in the lattice type jacket (4) is connected with the steel pile (5), the lattice type jacket can be designed into a quadrilateral lattice type jacket or a triangular lattice type jacket, the switching device (3) is connected with the lattice type jacket (4), the lower end of the steel tower (2) is connected with the switching device (3), and the fan (1) is arranged at the upper end of the steel tower (2);

As shown in fig. 2, after the steel pile (5) is positioned and sunk, flanges are respectively arranged at the top of the steel pile (5) and the bottom of the corner post (6), 4 stiffening ribs are arranged, a plurality of gaskets (10) with the thickness of 0.1-2 mm are arranged in the middle of the flanges, and a screw rod penetrates through the gaskets to connect the corner post (6) of the lattice jacket (4) with the steel pile (5).

As shown in fig. 3, the lattice jacket (4) is composed of corner posts (6) and diagonal rods (7). The steel pipes are all purchased with threaded steel pipe finished products, the steel strength grades are Q390, Q420 and Q460, the concrete strength grade is C50-C80, and the steel pipe thickness is 8-16 mm. The corner posts are all perpendicular to the ground, the diameter of the bottom corner post is 1-1.5 m, and the diameter of the steel pipe and the thickness of the steel pipe are gradually reduced along with the rise of the height.

As shown in fig. 4, the diagonal rods (7) in the lattice jacket (4) are made of common steel pipes, concrete is partially poured at the crossing nodes, and the length of the concrete is 3-5 times the diameter of the diagonal rods (7). The end of the inclined rod is provided with a hole, and the prestressed tendons (11) pass through the hole.

As shown in fig. 5, the corner posts (6) in the lattice jacket (4) are made of prestressed hollow sandwich steel pipe concrete, the outer layer steel pipes (15) are provided with holes, and the diagonal rods (7) penetrate through the holes and extend into the corner posts (6) to be connected with the inner layer steel pipes (14). 2 ring separators (13) are arranged above and below the connection node.

As shown in fig. 6, 6-10 holes and 6-10 stiffening ribs are uniformly distributed in the annular direction of the annular partition plate (13), the prestressed ribs penetrate through the annular partition plate (13) and the holes at the end parts of the inclined rods (7), and the prestressed ribs (11) are distributed along the through length.

As shown in fig. 7, the adapter device (3) is composed of an outer layer steel plate (17), an inner layer steel plate (16) and concrete. And welding studs at certain intervals on the inner side of the outer layer steel plate (17) and the outer side of the inner layer steel plate (16), and then pouring concrete. The upper part of a corner post (6) of the lattice jacket (4) is provided with 2 stiffening ribs which are connected with the lower part of the switching device (3) through screws. The upper part of the switching device (3) is connected with the lower part of the steel tower cylinder (2) through a flange, and the screw rod extends into the lower part of the bracket (20) in the switching device (3).

The specific production and installation method is as follows:

the method comprises the steps of prefabricating steel piles (5) in a factory, purchasing spiral steel pipe products, completing welding work of a switching device (3), inclined rods (7), flanges, stiffening ribs, annular partition plates (13) and bolts, completing tensioning and fixing of prestress ribs (11) in the factory, pouring hollow interlayer steel pipe concrete and inclined rod (7) components, completing manufacturing of corner posts (6) and inclined rods (7) in a lattice jacket (4), hoisting the lattice jacket (4) after positioning and pile sinking of the steel piles, performing bolt connection after leveling through multi-gasket flange connection, enabling the corner posts (6) to keep plumb installation, hoisting the switching device (3) after the lattice jacket is pressed, enabling the switching device (3) to be in bolt connection with the corner posts (7), hoisting a steel tower (2), enabling the lower portion of the steel tower (2) to be in bolt connection with the switching device (3), and finally installing a fan (1) of the steel tower (2).

Claims

1. A prestressed hollow sandwich steel tube concrete lattice hybrid jacket, characterized in that it comprises a wind turbine (1), a steel tower (2), a switching device (3), a lattice jacket (4), steel piles (5) and prestressed tendons (11); the steel piles (5) are pre-positioned and sunk; the corner columns (6) in the lattice jacket (4) are connected to the steel piles (5), and the corner columns (6) are all installed with plumb bobs; the switching device (3) and the lattice jacket (4) are connected to each other. connected; the lower end of the steel tower (2) is connected to the adapter (3); the corner column (6) is a prestressed hollow sandwich steel tube concrete, and 6 to 10 prestressed tendons are arranged in the sandwich concrete part. The pre-tensioning method is adopted, and the pre-tensioned prestressed tendons (11) are arranged in the circumferential direction in the sandwich concrete of the corner column (6) and arranged vertically along the length of the corner column (6); the fan (1) is arranged at the upper end of the steel tower (2); the centers of all corner columns (6) are connected in sequence to form a square or a triangle;

The diagonal rods (7) and corner columns (6) in the lattice-type jacket (4) are connected by welds. Holes are opened in the outer steel pipes (15) of the corner columns. The diagonal rods (7) extend into the interior of the corner columns and are connected to the inner steel pipes (14). Holes are opened at the ends of the diagonal rods (7). Prestressed tendons (11) pass through the holes. Concrete 3 to 5 times the diameter of the diagonal rods (7) is poured at the intersection nodes of the diagonal rods (7).

2. The prestressed hollow sandwich steel tube concrete lattice hybrid conductor frame according to claim 1 is characterized in that: the steel piles (5) and the corner columns (6) are connected by flange screws, 4 stiffening ribs are evenly arranged along the circumference of the steel piles and the corner columns, the screws are covered with multiple gaskets (10), and the gasket thickness is 0.1-2 mm; the length of the corner columns (6) in the lattice conductor frame (4) is between 15 meters and 25 meters, the cross-sectional diameter of the corner columns and the thickness of the steel pipe gradually decrease along the height, and the diameter change rate does not exceed 10%, the prestressed tendons (11) use prestressed steel strands, which are tensioned before pouring concrete in the factory; the diagonal rods (7) in the lattice conductor frame (4) all use ordinary steel pipes; the transition device (3) uses a steel tube concrete composite shell, bolts (18) are welded inside the steel plate, and then concrete is poured, and a bracket (20) is set at the end of the steel tube concrete composite shell, which is connected to the lower flange of the steel tower (2) through a screw.

3. The prestressed hollow sandwich steel tube concrete lattice hybrid jacket according to claim 2 is characterized in that: a flange is provided at the end of the corner column (6) in the lattice jacket (4), and four stiffening ribs are evenly arranged along the circumferential direction, and are connected to the lower part of the adapter (3) through screws, and the adapter (3) is provided with four stiffening ribs at the screw connection.

4. The prestressed hollow sandwich steel tube concrete lattice hybrid jacket according to claim 3 is characterized in that: the corner columns (6) in the lattice jacket (4) are evenly arranged with hole ring partitions (13) at the upper and lower ends of the connection nodes, the number of holes is 6 to 10, the prestressed tendons (11) pass through the holes, and 6 to 10 stiffening ribs are evenly arranged along the circumference of the hole ring partitions.

5. The prestressed hollow sandwich steel tube concrete lattice hybrid jacket according to claim 3 is characterized in that: the lattice jacket (4), the adapter (3), the hole ring partition (13) and the gasket (10) are all completed in the factory; and the screw connection is completed on site.