CN112112767A - Combined structure switching structure for wind turbine generator system steel-concrete tower cylinder - Google Patents

Abstract

The invention discloses a composite structure switching structure for a wind turbine generator system steel-concrete tower, which relates to the technical field of wind power generation and is characterized in that: the system comprises an outer circular truncated cone-shaped steel pipe, an inner circular truncated cone-shaped steel pipe, a vertical inner partition plate, concrete, a stud, an annular steel bar compression steel bar, an annular tension steel bar, a radial steel bar, a forging flange, a prestressed bar, a steel tower cylinder, a concrete tower cylinder and a reinforced concrete cushion layer. The upper end of the outer side circular truncated cone-shaped steel pipe is welded and forged with a flange and is connected with the upper steel tower barrel through bolts, studs are uniformly arranged on the inner surface of the outer side circular truncated cone-shaped steel pipe and the outer surface of the inner side circular truncated cone-shaped steel pipe, and vertical inner baffles are uniformly arranged along the circumferential direction. And circumferential reinforcing steel bars and radial reinforcing steel bars are arranged on the upper and lower parts of the cross section between the outer side circular truncated cone-shaped steel pipe and the inner side circular truncated cone-shaped steel pipe, and concrete is poured. Prestressed ducts are uniformly distributed in the concrete along the circumferential direction, and after the adapter ring is installed and aligned, prestressed tensioning is carried out from the bottom of the foundation of the lower concrete tower tube to the upper surface of the concrete in the adapter ring.

Description

A combined structure transfer structure for steel-mixed towers of wind turbines

technical field

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

Background technique

The development of wind power is one of the important ways to transform the national energy strategy. In recent years, wind power resources have been rapidly developed and utilized. In order to obtain higher wind speed and increase power generation, high-power, high-tower wind turbines have become a development trend. In order to save the cost of materials and improve the mechanical performance of the tower, a hybrid tower with a steel tower in the upper part and a concrete tower in the lower part came into being.

The hybrid tower has the advantages of good stability, high bearing capacity and good fatigue resistance, but the transfer device between the concrete tower and the steel tower is very important for the mechanical performance of the hybrid tower. The traditional reinforced concrete adapter ring has a large number of steel bars, complex arrangement, difficult processing and manufacturing, and the reinforced concrete structure is bulky and difficult to hoist. Compared with the traditional concrete transfer ring, the total material cost of the new steel-concrete composite transfer ring is reduced by 22,500 (12.5%), and the total weight is reduced by 20.8 tons (27.9%). Small consumption, labor saving, fast processing speed, and template-free; two steel backing plates and long screws in the traditional concrete adapter ring are omitted; on-site installation only needs to perform grouting and leveling on the adapter ring and the top of the mixing tower, and then install The speed is fast, and the promotion and application advantages are obvious.

SUMMARY OF THE INVENTION

The invention proposes a combined structure transfer structure for a steel-mixed tower of a wind turbine. Circumferential compression steel bars, circumferential tension steel bars, radial steel bars, forged flanges, prestressed bars, concrete filled steel tube cushions, anchors and bolts.

The upper end of the outer circular truncated steel pipe is welded with a forged flange, and the forged flange is connected with the upper steel cylinder by bolts. Bolts are arranged on the inner surface of the outer circular truncated steel pipe and the outer surface of the inner circular truncated steel pipe, vertical inner partitions are evenly arranged in the circumferential direction between the outer circular truncated steel pipe and the inner circular truncated steel pipe, and rectangular holes are left on the upper and lower sides of the inner The outer conical steel pipe is 500-800mm higher than the inner conical steel pipe, which is convenient for flange connection. A circular hole is left in the middle of the vertical inner partition to facilitate concrete pouring, and the diameter of the circular hole is 1/3 to 1/2 of the width of the partition. Concrete is poured between the outer circular truncated steel pipe and the inner circular truncated steel pipe, and bellows are used to reserve prestressed holes. The inner circular truncated steel pipe is reinforced with a short steel pipe corresponding to the passing position of the prestressing bar. The wall thickness of the short steel pipe is 1-2 mm, the diameter is the same as that of the corrugated pipe, and the length is 5-6 times the thickness.

A concrete-filled steel tube cushion is set between the lower part of the conversion structure and the top surface of the concrete tower. The concrete-filled steel tube cushion can be prefabricated in the factory to realize the conversion of circular section to any section.

This structure solves the shortcomings of the traditional transfer ring, such as the large number of steel bars, the complex arrangement, the difficulty in processing and manufacturing, the large volume of the reinforced concrete structure, and the difficulty in hoisting. The performance and the restraint performance of the steel pipe to the concrete, the mechanical performance is superior, the combined structural performance is adopted, the material consumption and the structural volume are reduced, the transportation is convenient, the construction period is short, the comprehensive benefit is high, and it has a broad engineering application prospect.

The technical scheme of the present invention is as follows:

A composite structure transfer structure for a steel-mixed tower of a wind turbine, the structure includes an outer circular truncated steel pipe, an inner circular truncated steel pipe, a vertical inner partition, concrete, a backing plate, a corrugated pipe, a stud, a circumferential receiving Compression bars, hoop tension bars, radial bars, forged flanges, prestressed bars, CFST cushions, short steel tubes, anchors and bolts.

This structure is mainly used to connect steel towers and concrete towers. The upper end of the outer circular truncated steel pipe is welded with a forged flange, which is connected with the upper steel tower by bolts. The inner surface of the outer circular truncated steel pipe and the inner surface of the inner circular truncated steel pipe are arranged with studs, and the studs are arranged in a plum blossom shape. This structure mainly bears vertical compressive stress, and the lateral stress is relatively small, so the horizontal spacing is 1.5 to 2 of the vertical spacing. times.

Vertical inner partitions are evenly arranged in the circumferential direction between the outer circular truncated steel pipe and the inner circular truncated steel pipe, and rectangular holes are left on the upper and lower sides of the inner partition, so that the circumferential compression steel bars and the circumferential tension steel bars can pass through. Concrete is filled between the cone-shaped steel pipe and the inner cone-shaped steel pipe. The outer circular truncated steel pipe is 500-800mm higher than the inner circular truncated steel pipe, which reserves space for the upper flange connection. The height of the concrete pouring and the height of the vertical inner partition are the same as the height of the inner circular truncated steel pipe.

The transfer structure is installed and aligned with the concrete tower through the concrete-filled steel tube cushion, and the prestressed tendons are stretched from the concrete tower foundation to the concrete top of the structure. destroy. When the prestressing passes through the inner truncated steel tube, the short steel tube is used for stiffening. The prestressed tendons in the body make the concrete tower and the transfer structure in a state of full-section compression, which increases the overall performance of the concrete tower. At the same time, placing the prestressed tendons inside can effectively slow down the corrosion of the prestressed tendons.

The present invention has the following beneficial effects with respect to the prior art:

(1) The steel tower and the concrete tower are connected by bolts and prestressed bars through the transfer structure. Compared with the traditional concrete transfer ring, the steel backing plate and the long screw are omitted, and the amount of steel bars in the new transfer structure is reduced. Small, save manpower, fast processing speed, save template.

(2) In this structure, studs and vertical inner partitions are arranged between the outer circular truncated steel pipe and the inner circular truncated steel pipe to give full play to the combined effect between the steel plate and the concrete. The inner concrete mainly bears compressive stress, and the prestress and the steel plate Confining stress on concrete has the advantages of high bearing capacity, good stability, material saving and low cost.

(3) The structure adopts the construction method of factory prefabrication and on-site assembly. On-site installation only needs to perform grouting and leveling on the adapter ring and the top of the mixing tower. The installation speed is fast, and the steel-concrete composite structure is used to reduce the structural weight and facilitate Transport and hoisting.

(4) The transfer structure is installed and aligned with the lower concrete tower through the concrete-filled steel tube cushion to realize the transformation of the circular section to any section.

Description of drawings

Fig. 1 is the overall schematic diagram of the present invention;

Fig. 2 is the top schematic diagram of the combined structure transfer structure of the present invention;

3 is a schematic diagram of the bottom surface of the combined structure transfer structure of the present invention;

4 is a schematic cross-sectional view of the combined structure transfer structure 1-1 of the present invention;

5 is a schematic cross-sectional view of the combined structure transfer structure 2-2 of the present invention;

6 is a schematic diagram of the arrangement of pins in the combined structure transfer structure of the present invention;

7 is a schematic diagram of a concrete-filled steel tube cushion in the combined structure transfer structure of the present invention;

FIG. 8 is a schematic diagram of the connection between the steel tower and the concrete tower by the composite structure conversion structure of the present invention.

In the picture: 1- Outer circular truncated steel pipe, 2- Inner circular truncated steel pipe, 3- Vertical inner diaphragm, 4- Concrete, 5- Backing plate, 6- Bellows, 7- Stud, 8- Circumferential compression Steel bars, 9-circumferential tension steel bars, 10-forged flanges, 11-prestressed tendons, 12-anchors, 13-steel towers, 14-concrete towers, 15-bolts, 16-rectangular reserved holes, 17- On-site grouting leveling, 18- Short steel pipe, 19- Vertical inner partition opening, 20- Radial steel bar, 21- Spiral steel bar, 22- Steel tube concrete cushion, 23- Outer steel pipe, 24- Inner steel pipe, 25 - Internal stiffeners.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, a composite structure connection structure for a steel-concrete tower of a wind turbine, the structure is used to connect a steel tower (13) and a concrete tower (14), and the forged flange (10) at the upper end of the connection structure is connected. ) is connected to the steel tower (13) with bolts (15).

As shown in Figure 2, a forged flange (10) is welded on the upper end of the outer circular truncated steel pipe (1), and a vertical inner baffle ( 3), a circular hole (19) is opened at the height of the middle of the vertical inner clapboard to ensure the quality of concrete pouring, and the diameter of the opening (19) of the vertical inner clapboard is 1/3~ 1/2.

As shown in Figure 3, concrete (4) is poured between the outer truncated truncated steel pipe (1) and the inner truncated truncated steel pipe (2), and a bellows (6) is used inside the concrete (4) to reserve prestressed tendons (11) holes. The short steel pipe (18) is used for reinforcement at the position where the prestress passes through the inner circular truncated steel pipe (2).

As shown in Figure 4, rectangular reserved holes (16) are reserved at the upper and lower ends of the vertical inner partition plate (4) so that the hoop compression reinforcement (8) and the hoop tension reinforcement (9) can pass through, and the hoop compression The steel bars (8) are equipped with radial steel bars (20) to form a steel mesh to withstand prestressed local compressive stress, and the force is evenly transmitted to the lower concrete (4) through the lower spiral steel bars (21).

As shown in Fig. 5, studs are arranged on the inner surface of the outer circular truncated steel pipe (1) and the outer surface of the inner circular truncated steel pipe (2).

As shown in Figure 6, the studs arranged on the inner surface of the outer circular truncated steel pipe (1) and the outer surface of the inner circular truncated steel pipe (2) are arranged in a plum-shaped arrangement, and the horizontal spacing is 1.5 to 2 times the vertical spacing. The pouring height of concrete (4) and the height of the vertical inner partition plate (3) are consistent with the height of the inner circular truncated steel pipe (2).

As shown in Figure 7, the diameter of the inner steel pipe (24) of the concrete filled steel tube cushion (22) corresponds to the diameter of the lower part of the inner circular truncated steel pipe (2), and the inner stiffener (25) and the vertical inner partition plate (3) have the same diameter. The positions correspond to the same, and concrete (4) is filled between the inner and outer steel pipes.

As shown in Figure 8, on-site grouting and leveling (17) are used between the adapter ring and the concrete tower. Prestress is applied to the surface, so that the concrete tower (14) is integral with the transfer structure.

Claims (3)

1. The utility model provides a integrated configuration switching structure for wind turbine generator system steel-concrete tower section of thick bamboo, relates to wind power generation technical field, characterized by: the system comprises an outer-side truncated cone-shaped steel pipe (1), an inner-side truncated cone-shaped steel pipe (2), a vertical inner partition plate (3), concrete (4), a base plate (5), a corrugated pipe (6), a stud (7), a circumferential steel bar compression steel bar (8), a circumferential tension steel bar (9), a forging flange (10), a prestressed rib (11), an anchorage device (12), a steel tower cylinder (13), a concrete tower cylinder (14), a bolt (15), a short steel pipe (18), a radial steel bar (20), a spiral steel bar (21) and a steel pipe concrete cushion layer (22); the upper part of the switching structure is connected with a steel tower barrel (13), and the lower part of the switching structure is connected with a concrete tower barrel (14).

2. The composite structure transfer construction for the wind turbine steel-concrete tower according to claim 1, characterized in that: the upper end of the outer circular truncated cone-shaped steel pipe (1) is welded with a forging flange (10), and the upper end of the forging flange (10) is connected with an upper steel tower tube (13) through a bolt (15); the inner surface of the outer side circular truncated cone-shaped steel pipe (1) and the outer surface of the inner side circular truncated cone-shaped steel pipe (2) are uniformly provided with studs (7), 6-12 vertical inner partition plates (3) are uniformly arranged along the circumferential direction, in order to ensure the concrete pouring quality, the middle of each vertical inner partition plate (3) is provided with a hole, and the diameter of each hole is 1/3-1/2 of the width of each vertical inner partition plate (3); annular steel bar compression steel bars (8) and annular tension steel bars (9) are respectively arranged at the upper part and the lower part of the section between the outer side circular truncated cone-shaped steel pipe (1) and the inner side circular truncated cone-shaped steel pipe (2); a rectangular preformed hole (16) is reserved in the position, corresponding to the steel bar, of the vertical inner partition plate (3); concrete (4) is poured between the outer side circular truncated cone-shaped steel pipe (1) and the inner side circular truncated cone-shaped steel pipe (2), and corrugated pipes (6) are uniformly arranged in the concrete along the circumferential direction and used for reserving a prestressed tendon (11) hole channel; the diameter of an inner steel pipe (24) of the steel pipe concrete cushion layer (22) is consistent with the diameter of the lower end of an inner side circular truncated cone-shaped steel pipe (2) in the transfer structure, the positions of an internal stiffening rib (25) and a vertical inner partition plate (3) in the transfer structure are correspondingly consistent, the section of an outer steel pipe (23) can be triangular, quadrangular, hexagonal, chamfered triangular or chamfered quadrangular according to the structural form of a lower concrete tower tube (14), and the height of the steel pipe concrete cushion layer (22) is generally 1.5-2 times of the side length of the outer steel pipe (23).

3. The composite structure transfer construction for the wind turbine steel-concrete tower according to claim 2, characterized in that: a steel pipe concrete cushion layer (22) is arranged between the bottom surface of the switching structure and the lower concrete tower tube (14), conversion from a circular section to an arbitrary section is realized, on-site grouting leveling (17) is adopted, after alignment is carried out, integral prestressed tendons (11) are tensioned from the bottom of the foundation of the lower concrete tower tube (14) to the upper surface of concrete (4) in the switching ring, a base plate (5) is placed below an anchorage device (12) during tensioning, radial reinforcing steel bars (20) are arranged on the upper side of the concrete, the radial reinforcing steel bars (20) and annular stressed reinforcing steel bars (8) jointly bear local compressive stress of the prestressed tendons (11), and the force is uniformly transmitted to the lower concrete through lower spiral reinforcing steel bars (21); the pegs (7) are arranged in a quincunx manner, and the transverse spacing is 1.5-2 times of the vertical spacing; the outer side circular truncated cone-shaped steel tube (1) is 500-800 mm higher than the inner side circular truncated cone-shaped steel tube (2); the pouring height of the concrete (4) and the height of the vertical inner partition plate (3) are consistent with the height of the inner side circular truncated cone-shaped steel pipe (2); the anchor hole of the prestressed rib (11) of the inner side circular truncated cone-shaped steel pipe (2) is reinforced by a short steel pipe, the diameter of the steel pipe is the same as that of the corrugated pipe (6), the thickness of the steel pipe is 1-2 mm, and the length of the steel pipe is 5-6 times of the thickness of the corrugated pipe.

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