A combined structural transfer structure for steel-concrete tower of wind turbine

Abstract

The present invention discloses a combined structural transfer structure for a steel-concrete tower of a wind turbine generator set, which relates to the technical field of wind power generation, and is characterized in that the system comprises an outer truncated cone steel pipe, an inner truncated cone steel pipe, a vertical inner partition, concrete, bolts, annular compression steel bars, annular tension steel bars, radial steel bars, a forged flange, prestressed bars, a steel tower, a concrete tower, and a reinforced concrete cushion. The upper end of the outer truncated cone steel pipe is welded with a forged flange and bolted to the upper steel tower, and bolts are arranged on the inner surface of the outer truncated cone steel pipe and the outer surface of the inner truncated cone steel pipe, and vertical inner partitions are evenly arranged along the annular direction. Annular steel bars and radial steel bars are arranged on the upper and lower sections between the outer truncated cone steel pipe and the inner truncated cone steel pipe, and concrete is poured. Prestressed channels are evenly arranged along the annular direction inside the concrete, and after the adapter ring is installed and aligned, prestressing is performed from the bottom of the foundation of the lower concrete tower to the upper surface of the concrete inside the adapter ring.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation. Background Art

[0002] Developing 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 speeds and increase power generation, high-power, high-tower wind turbines have become a development trend. In order to save material costs and improve the tower's mechanical performance, a hybrid tower with a steel tower on the top and a concrete tower on the bottom came into being.

[0003] The hybrid tower has the advantages of good stability, high bearing capacity, and good fatigue resistance, but the transition device between the concrete tower and the steel tower is crucial to the stress performance of the hybrid tower. The traditional reinforced concrete transition ring has a large number of steel bars, complex layout, and is difficult to process and manufacture. The reinforced concrete structure is large and difficult to hoist. Compared with the traditional concrete transition ring, the total material cost of the new steel-concrete composite transition ring is reduced by 22,500 (12.5%), and the total weight is reduced by 20.8 tons (27.9%). At the same time, the new steel-concrete composite transition ring uses less steel bars, saves manpower, has a fast processing speed, and does not require formwork; it eliminates the two steel pads and long screws in the traditional concrete transition ring; on-site installation only requires one grouting and leveling of the transition ring and the top of the hybrid tower, and the installation speed is fast, with obvious advantages in promotion and application. Summary of the invention

[0004] The present invention proposes a combined structural transition structure for a steel-concrete tower of a wind turbine generator set, which consists of an outer truncated cone steel pipe, an inner truncated cone steel pipe, a vertical inner partition, concrete, a pad, a corrugated pipe, bolts, annular compressive steel bars, annular tensile steel bars, radial steel bars, a forged flange, prestressed bars, a steel tube concrete cushion, anchors and bolts.

[0005] A forged flange is welded on the upper end of the outer truncated cone steel pipe, and the forged flange is connected to the upper steel cylinder by bolts. Studs are arranged on the inner surface of the outer truncated cone steel pipe and the outer surface of the inner truncated cone steel pipe. Vertical inner partitions are evenly arranged along the circumference between the outer truncated cone steel pipe and the inner truncated cone steel pipe. Rectangular holes are left on the upper and lower sides of the inner partitions to allow the circumferential compression steel bars and circumferential tension steel bars to pass through. The outer truncated cone steel pipe is 500 to 800 mm higher than the inner truncated cone steel pipe for easy flange connection. A circular hole is left in the middle of the vertical inner partition for easy concrete pouring. The diameter of the circular hole is 1 / 3 to 1 / 2 of the partition width. Concrete is poured between the outer truncated cone steel pipe and the inner truncated cone steel pipe, and a prestressed channel is reserved with a corrugated pipe. Short steel pipes are used to reinforce the inner truncated cone steel pipe corresponding to the position where the prestressed tendons pass through. The wall thickness of the short steel pipe is 1 to 2 mm, the diameter is the same as the diameter of the corrugated pipe, and the length is 5 to 6 times the thickness.

[0006] A steel tube concrete cushion is arranged between the lower part of the conversion structure and the top surface of the concrete tower. The steel tube concrete cushion can be prefabricated in a factory to realize the conversion from a circular cross-section to an arbitrary cross-section.

[0007] This structure solves the shortcomings of traditional transfer rings, such as a large number of steel bars, complex layout, difficulty in processing and manufacturing, large reinforced concrete structure volume, and difficulty in lifting. It can realize fully prefabricated construction with factory prefabrication and on-site assembly, give full play to the compressive properties of concrete and the restraint performance of steel pipes on concrete, have excellent mechanical properties, adopt combined structural performance, reduce material consumption and structural volume, facilitate transportation, short construction period, high comprehensive benefits, and has broad engineering application prospects.

[0008] The technical solution of the present invention is as follows:

[0009] A combined structural transition structure for a steel-concrete tower of a wind turbine generator set, comprising an outer truncated cone steel pipe, an inner truncated cone steel pipe, a vertical inner partition, concrete, a pad, a corrugated pipe, bolts, annular compression steel bars, annular tension steel bars, radial steel bars, a forged flange, prestressed bars, a steel tube concrete cushion, a short steel pipe, an anchor and bolts.

[0010] This structure is mainly used to connect steel towers and concrete towers. A forged flange is welded on the upper end of the outer truncated cone steel pipe, which is connected to the upper steel tower by bolts. Studs are arranged on the inner surface of the outer truncated cone steel pipe and the outer surface of the inner truncated cone steel pipe. The studs are arranged in a plum blossom shape. This structure mainly bears vertical compressive stress, and the transverse stress is relatively small. Therefore, the transverse spacing is 1.5 to 2 times the vertical spacing.

[0011] Vertical inner partitions are evenly arranged along the circumference between the outer truncated cone steel pipe and the inner truncated cone steel pipe. Rectangular holes are left on the upper and lower sides of the inner partitions to allow the circumferential compression steel bars and the circumferential tension steel bars to pass through. Concrete is filled between the outer truncated cone steel pipe and the inner truncated cone steel pipe. The outer truncated cone steel pipe is 500 to 800 mm higher than the inner truncated cone steel pipe to reserve space for the upper flange connection. The height of the concrete pouring and the height of the vertical inner partition are consistent with the height of the inner truncated cone steel pipe.

[0012] The transfer structure is installed in alignment with the concrete tower through the steel tube concrete cushion layer. The prestressed tendons are tensioned from the concrete tower foundation to the top of the concrete inside the structure. When tensioning the prestressed tendons, a pad needs to be placed on the top of the concrete to prevent local compression damage. When the prestress passes through the inner truncated cone steel tube, a short steel tube is used for reinforcement. The prestressed tendons in the body put the concrete tower and the transfer structure in a full-section compression state, 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.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The steel tower and the concrete tower are connected by bolts and prestressed tendons through a transition structure. Compared with the traditional concrete transition ring, the steel plate and long screw are eliminated. In addition, the new transition structure uses less steel bars, saves manpower, speeds up processing, and saves formwork.

[0015] (2) In this structure, bolts and vertical inner partitions are arranged between the outer truncated cone steel tube and the inner truncated cone steel tube to give full play to the combined effect between the steel plate and the concrete. The internal concrete mainly bears compressive stress, and the prestressing force and the steel plate produce constrained stress on the concrete. It has the advantages of high bearing capacity, good stability, material saving and low cost.

[0016] (3) The structure is prefabricated in the factory and assembled on site. On-site installation only requires grouting and leveling of the adapter ring and the top of the concrete tower. The installation speed is fast, and the steel-concrete composite structure is adopted to reduce the weight of the structure and facilitate transportation and lifting.

[0017] (4) The transition structure is installed in alignment with the lower concrete tower through the steel tube concrete cushion layer to achieve the transformation of the circular cross-section into any cross-section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the top surface of the combined structure transfer structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the bottom surface of the combined structure transfer structure of the present invention;

[0021] Figure 4 It is a cross-sectional schematic diagram of the combined structure transfer structure 1-1 of the present invention;

[0022] Figure 5 It is a cross-sectional schematic diagram of the combined structure transfer structure 2-2 of the present invention;

[0023] Figure 6 It is a schematic diagram of the arrangement of the pegs in the combined structure transfer structure of the present invention;

[0024] Figure 7 It is a schematic diagram of a steel tube concrete cushion layer in the combined structure transfer structure of the present invention;

[0025] Figure 8 It is a schematic diagram of the connection between the steel tower and the concrete tower of the combined structural conversion structure of the present invention.

[0026] In the figure: 1-outer truncated cone steel pipe, 2-inner truncated cone steel pipe, 3-vertical inner partition, 4-concrete, 5-pad, 6-corrugated pipe, 7-stud, 8-circumferential compression steel bar, 9-circumferential tension steel bar, 10-forged flange, 11-prestressed tendons, 12-anchor, 13-steel tower, 14-concrete tower, 15-bolt, 16-rectangular reserved hole, 17-on-site grouting and 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 stiffening rib. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings.

[0028] like Figure 1 As shown, a combined structural connection structure for a steel-concrete tower of a wind turbine generator set is used to connect a steel tower (13) and a concrete tower (14). A forged flange (10) at the upper end of the connection structure is connected to the steel tower (13) by bolts (15).

[0029] like Figure 2 As shown, a forged flange (10) is welded to the upper end of the outer truncated cone steel pipe (1), and a vertical inner partition (3) is evenly arranged along the circumferential direction between the outer truncated cone steel pipe (1) and the inner truncated cone steel pipe (2). A circular hole (19) is opened at the middle height of the vertical inner partition to ensure the quality of concrete pouring, and the diameter of the hole (19) of the vertical inner partition is 1 / 3 to 1 / 2 of the width of the vertical inner partition (3).

[0030] like Figure 3 As shown, concrete (4) is poured between the outer truncated cone steel pipe (1) and the inner truncated cone steel pipe (2), a corrugated pipe (6) is used inside the concrete (4) to reserve a channel for prestressed tendons (11), and a short steel pipe (18) is used to reinforce the position where the prestress passes through the inner truncated cone steel pipe (2).

[0031] like Figure 4 As shown, rectangular reserved holes (16) are reserved at the upper and lower ends of the vertical inner partition (4) to allow the annular compressive steel bars (8) and the annular tensile steel bars (9) to pass through, and radial steel bars (20) are arranged at the positions of the annular compressive steel bars (8) to form a steel mesh to withstand the local compressive stress of the prestressing, and the force is evenly transmitted to the lower concrete (4) through the lower spiral steel bars (21).

[0032] like Figure 5 As shown, bolts are arranged on the inner surface of the outer truncated cone steel pipe (1) and the outer surface of the inner truncated cone steel pipe (2).

[0033] like Figure 6As shown, the studs arranged on the inner surface of the outer truncated cone steel pipe (1) and the outer surface of the inner truncated cone steel pipe (2) are arranged in a plum blossom shape, and the horizontal spacing is 1.5 to 2 times the vertical spacing. The pouring height of the concrete (4) and the height of the vertical inner partition (3) are both consistent with the height of the inner truncated cone steel pipe (2), and the outer truncated cone steel pipe (1) is 500 to 800 mm higher than the inner truncated cone steel pipe (2).

[0034] like Figure 7 As shown, the diameter of the inner steel tube (24) of the steel tube concrete cushion layer (22) corresponds to the lower diameter of the inner truncated cone-shaped steel tube (2), the position of the internal stiffening rib (25) corresponds to the position of the vertical inner partition (3), and concrete (4) is filled between the inner and outer steel tubes.

[0035] like Figure 8 As shown, on-site grouting and leveling (17) is adopted between the adapter ring and the concrete tower. After the installation of the adapter structure is completed, prestress is applied from the foundation of the concrete tower (14) to the top surface of the concrete (4) in the adapter structure, so that the concrete tower (14) and the adapter structure form a whole.

Claims

1. A combined structural transition structure for a steel-concrete tower of a wind turbine generator set, the transition structure being used to connect a steel tower (13) and a concrete tower (14), wherein: The transition structure comprises an outer truncated cone steel pipe (1), an inner truncated cone steel pipe (2), a vertical inner partition (3), concrete (4), a pad (5), a corrugated pipe (6), a bolt (7), annular compression steel bars (8), annular tension steel bars (9), a forged flange (10), a prestressed bar (11), an anchor (12), a bolt (15), a short steel pipe (18), radial steel bars (20), a spiral steel bar (21), and a steel pipe concrete cushion (22); the upper part of the outer truncated cone steel pipe (1) is connected to a steel tower (13), and the lower part is connected to a concrete tower (14); A forged flange (10) is welded to the upper end of the outer truncated cone steel pipe (1), and the upper end of the forged flange (10) is connected to the upper steel tower (13) by bolts (15); bolts (7) are arranged on the inner surface of the outer truncated cone steel pipe (1) and the outer surface of the inner truncated cone steel pipe (2), and 6 to 12 vertical inner partitions (3) are evenly arranged along the circumferential direction. In order to ensure the quality of concrete pouring, a hole is opened in the middle of the vertical inner partition (3), and the diameter of the hole is 1 / 3 to 1 / 2 of the width of the vertical inner partition (3); annular steel compression steel bars (8) and annular tensile steel bars (9) are arranged above and below the cross section between the outer truncated cone steel pipe (1) and the inner truncated cone steel pipe (2); rectangular reserved holes are reserved at the corresponding steel bar positions of the vertical inner partition (3). (16); concrete (4) is poured between the outer truncated cone steel tube (1) and the inner truncated cone steel tube (2), and a corrugated tube (6) is evenly arranged in the circumferential direction inside the concrete to reserve a channel for the prestressed tendons (11); the diameter of the inner steel tube (24) of the steel tube concrete cushion layer (22) is consistent with the diameter of the lower end of the inner truncated cone steel tube (2) in the transition structure, the internal stiffening rib (25) corresponds to the position of the vertical inner partition (3) in the transition structure, the cross-section of the outer steel tube (23) can be a triangle, a quadrilateral, a hexagon, a chamfered triangle or a chamfered quadrilateral according to the structural form of the lower concrete tower (14), and the height of the steel tube concrete cushion layer (22) is generally 1.5 to 2 times the side length of the outer steel tube (23); A steel tube concrete cushion layer (22) is arranged between the bottom surface of the transition structure and the lower concrete tower (14) to achieve the transformation from a circular cross section to an arbitrary cross section. On-site grouting and leveling (17) are adopted. After installation and alignment, the overall prestressed tendons (11) are tensioned from the bottom of the foundation of the lower concrete tower (14) to the upper surface of the concrete (4) in the transition ring. During tensioning, a pad (5) is placed under the anchor (12), and radial steel bars (20) are arranged on the upper side of the concrete. The radial steel bars (20) are arranged at the position of the annular compressive steel bars (8). The radial steel bars (20) and the annular compressive steel bars (8) jointly bear the prestressed tendons (11). ) and uniformly transmits the force to the lower concrete through the lower spiral reinforcement (21); the bolts (7) are arranged in a plum blossom shape, and the horizontal spacing is 1.5 to 2 times the vertical spacing; the outer frustum-shaped steel pipe (1) is 500 to 800 mm higher than the inner frustum-shaped steel pipe (2); the pouring height of the concrete (4) and the height of the vertical inner partition (3) are consistent with the height of the inner frustum-shaped steel pipe (2); the anchor hole of the prestressed tendon (11) of the inner frustum-shaped steel pipe (2) is reinforced with a short steel pipe, the diameter of the steel pipe is the same as the diameter of the corrugated pipe (6), the thickness is 1 to 2 mm, and the length is 5 to 6 times the thickness.

Images