A kind of outer package formwork type tower cylinder steel mixed transition section connecting device

Abstract

The present application relates to a kind of outer package template type tower cylinder steel mixed transition section connecting device, steel cylinder section is set in the upper of concrete cylinder section, steel cylinder section is set on concrete cylinder section by device, the device includes transition section connecting portion, and the transition section connecting portion includes end plate and wallboard, the top of concrete cylinder section is covered with end plate and wallboard respectively in upper surface and cylinder wall, steel cylinder section is set on end plate, the end plate is provided with perforated plate, and the perforated plate is embedded in concrete cylinder section, steel bar passes through the bottom of steel cylinder section and device, and it is inserted into concrete cylinder section.Compared with prior art, the present application increases the connecting strength of tower cylinder steel mixed transition section, improves the stability of structure, prevents structure buckling deformation.

Description

Technical Field

[0001] This invention belongs to the field of ultra-high tower construction technology and relates to a connecting device for the steel-concrete transition section of an externally enclosed template-type tower. Background Technology

[0002] The power generation efficiency of wind turbine towers is positively correlated with their height. With the development of energy engineering in my country, wind turbine towers are gradually moving towards ultra-high towers. However, as the height increases, the structural characteristics of the tower itself also change towards taller structures. While the structural load increases, the overall stiffness decreases, leading to wind damage and overturning of the tower. Therefore, ultra-high towers mostly adopt a steel-concrete composite structure with a lighter, higher mechanical strength upper layer and a reinforced concrete lower layer. Among these, the strength of the steel-concrete interface in the composite structure becomes the most significant factor affecting structural safety and durability.

[0003] The existing method for connecting steel-concrete composite sections involves cast-in-place reinforced concrete with pre-reserved reinforcing ducts running through the prestressed steel bars, and prestressing to provide connection strength. This method requires the installation of formwork and on-site pouring, resulting in a complex construction process and a long construction period. Furthermore, since the prestressed steel bars are internally embedded components, construction quality is difficult to inspect, and it is also inconvenient for later maintenance and replacement.

[0004] Patent CN108266330A discloses a prestressed reinforced concrete tower for wind turbines. The bottom of the top steel tower section has a flange structure, which includes a flange plate, a stiffening plate, and a gasket. Prestressed steel strands pass through the flange plate, gasket, and the concrete tower transition section. The upper end of the prestressed steel strands is anchored to the upper surface of the flange plate via a lock head, and the lower end is connected to the disc-shaped foundation of the wind turbine's reinforced concrete tower. The flange plate and gasket are annular steel plates, and the flange plate, steel tower section, and stiffening plate are welded together. The annular gasket serves as a concrete protection device and is pre-embedded at the top of the concrete tower transition section. The flange plate and gasket have a corresponding number of bolt holes and perforations for the prestressed steel strand sleeves. However, this patent uses a structure of welded flange plates and pre-embedded gaskets, with a steel plate-concrete connection interface. The connection strength needs to be provided by tensioning prestressed steel strands throughout the entire tower height. As the tower height increases, the increased length of the steel strands presents a construction problem of difficulty in on-site prestressing tensioning.

[0005] Patent CN112832122A discloses a bottom-fixed structure for steel piers of small-to-medium span rigid frame bridges, including a steel pier and a foundation cap. The lower end of the steel pier is fixed to the foundation cap. A steel shoe component is provided at the bottom of the steel pier, and one end of the steel shoe component is connected to a loosely bonded prestressed steel strand. The other end of the loosely bonded prestressed steel strand is pre-embedded and fixed in the foundation cap. That is, the bottom of the steel pier is fixed to the foundation cap by several loosely bonded prestressed steel strands. However, the steel shoe structure of this patent is an external component. In order to maintain the durability of the structure, the structural dimensions must be increased on the basis of the original structure, resulting in abrupt changes in the structural cross-section. Summary of the Invention

[0006] The purpose of this invention is to overcome at least one of the defects of the prior art and provide an external template-type tower steel-concrete transition section connection device. This invention increases the connection strength of the tower steel-concrete transition section, improves the stability of the structure, and prevents structural buckling deformation.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] One of the technical solutions of this invention is to provide an externally packaged template-type tower steel-concrete transition section connection device, wherein the steel cylinder segment is arranged above the concrete cylinder segment, and the steel cylinder segment is erected on the concrete cylinder segment through the device to achieve the connection between the steel cylinder segment and the concrete cylinder segment.

[0009] The device includes a transition section connecting part, which includes an end plate and a wall plate. The top of the concrete cylinder segment is covered with the end plate and the wall plate, respectively, and the steel cylinder segment is mounted on the end plate.

[0010] Several perforated plates are evenly spaced below the end plate, and these perforated plates are embedded in the concrete cylinder segment to provide connection strength between the end plate and the concrete cylinder segment. The height of the perforated plates is the anchorage length of the reinforcing bars in the concrete cylinder segment. The perforations ensure that the tensile force of the concrete cylinder segment is transferred to the transition section connection.

[0011] Several reinforcing bars are passed through the bottom of the steel cylinder segment and the device at equal intervals, and extend into the concrete cylinder segment. The reinforcing bars are anchored at the lower end of the steel cylinder segment and pass through the concrete cylinder segment, ensuring the overall connection of the transition section and enhancing the integrity of the structure. It also avoids the difficulties of on-site prestressing tensioning caused by the full-length prestressed steel strands of the tower.

[0012] Furthermore, the size of the end plate is the same as the size of the upper surface of the concrete cylinder segment, and the height of the covering area of ​​the wall plate is 1 / 5 to 1 / 3 of the height of the uppermost concrete cylinder segment connected to the steel cylinder segment, and not less than the wall thickness of the concrete cylinder segment. The height design ensures the bonding strength between the steel interface and the concrete, and improves the tensile and shear strength.

[0013] Furthermore, the wall panel includes an inner wall panel and an outer wall panel. The top of the concrete cylinder segment is covered with an end plate, an inner wall panel, and an outer wall panel on its upper surface, inner wall, and outer wall, respectively. The end plate, inner wall panel, and outer wall panel of the transition section connection serve as permanent templates for the concrete cylinder segment casting, transferring the stress of the entire cross-section of the concrete cylinder segment to the steel cylinder segment, increasing the overall stiffness of the structure, and preventing shear failure at the steel-concrete connection interface.

[0014] Furthermore, the inner diameter of the top of the concrete cylinder segment remains unchanged, while the outer diameter gradually decreases from bottom to top, resulting in a gradual change in the cross-sectional dimensions of the concrete cylinder segment and reducing abrupt changes in cross-sectional stress.

[0015] Furthermore, the end plate is vertically connected to the inner wall plate, and the end plate is connected to the outer wall plate at an angle of no more than 120°. The angle design ensures the bonding strength between the steel interface and the concrete, and improves the tensile and shear strength.

[0016] Furthermore, the bottom of the wall of the steel cylinder segment is vertically connected to the base, which is located inside the steel cylinder segment. The steel cylinder segment is supported on the end plate by the base, and the base provides space for the steel cylinder segment to have holes for reinforcing bars.

[0017] Furthermore, screw holes are provided in both the base and the end plate. The reinforcing bars pass through the screw holes in the base and the end plate and are anchored to the base and the end plate by anchor bolts to ensure the connection strength between the transition section and the steel cylinder segment.

[0018] Furthermore, washers are provided at the anchorage ends of the reinforcing bars to reduce friction, and protective caps are screwed on to prevent rust.

[0019] Furthermore, several sleeves are arranged at equal intervals under the end plate. The sleeves are embedded in the concrete cylinder segment. The inner surface of the sleeve is threaded. The reinforcing bars pass through the sleeves. The internal thread of the sleeve fixes the direction of the reinforcing bars, ensuring that the stress of the reinforcing bars is uniformly and continuously transmitted to the concrete cylinder segment through the perforated plate.

[0020] Furthermore, perforated plates are provided on both sides of the sleeve. These perforated plates are arranged radially along the tower cylinder and perpendicular to the end plate and wall plate, which increases the radial stiffness of the structure and prevents the structure from bending and deforming due to wind.

[0021] As a preferred technical solution, the transition section connecting part composed of steel structure is assembled from prefabricated steel plates in the factory. The end plate, inner wall plate, outer wall plate, perforated plate and sleeve are all made of steel and the steel should be rust-proofed.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention transforms the connection between steel and concrete into a connection between steel and steel by using an external template-type steel structure connection device, thereby increasing the connection strength and improving the stability of the structure;

[0024] (2) The present invention adopts a steel plate splicing structure, which is simple in structure and the quality can be directly inspected by external appearance test. It has the advantages of being detachable, easy to replace and easy to repair.

[0025] (3) The present invention uses an embedded perforated plate as a connector to improve the bonding between the steel connection device and the concrete and prevent structural buckling deformation.

[0026] (4) The present invention uses an external steel structure connection, which can be used as a permanent formwork for precast concrete segments, reducing construction procedures and construction difficulty. Attached Figure Description

[0027] Figure 1 This is a side view of the external template-type tower steel-concrete transition section connection device in an embodiment of the present invention;

[0028] Figure 2 This is a front view structural schematic diagram of the external template-type tower steel-concrete transition section connection device in an embodiment of the present invention;

[0029] Figure 3 This is a three-dimensional structural diagram of the transition section connection part in an embodiment of the present invention.

[0030] Explanation of markings in the diagram:

[0031] 1—Steel cylinder segment, 2—Concrete cylinder segment, 3—Transition section connection, 31—End plate, 32—Inner wall plate, 33—Outer wall plate, 34—Opening plate, 35—Sleeve, 4—Reinforcing bar, 5—Protective cap, 6—Washer. Detailed Implementation

[0032] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and do not imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Example:

[0036] An externally packaged template-type steel-concrete transition section connection device for wind turbine towers is applied to the combined transition connection of steel cylinder segment 1 and concrete cylinder segment 2, such as... Figures 1 to 3 As shown, steel cylinder segment 1 is positioned above concrete cylinder segment 2, and the steel cylinder segment 1 is connected to the concrete cylinder segment 2 by means of a device.

[0037] The device includes a transition section connection part 3, which includes an end plate 31 and a wall plate. The top of the concrete cylinder section 2 is covered with the end plate 31 and the wall plate on its upper surface and cylinder wall, respectively. The steel cylinder section 1 is mounted on the end plate 31.

[0038] Several perforated plates 34 are evenly spaced below the end plate 31. The perforated plates 34 are embedded in the concrete cylinder segment 2 to provide connection strength between the end plate 31 and the concrete cylinder segment 2. The height of the perforated plates 34 is the anchorage length of the reinforcing bars 4 in the concrete cylinder segment 2. The perforations ensure that the tensile force of the concrete cylinder segment 2 is transferred to the transition section connection part 3.

[0039] Several reinforcing bars 4 are equally spaced through the bottom of the steel cylinder segment 1 and the device, and extend into the concrete cylinder segment 2. The reinforcing bars 4 are anchored at the lower end of the steel cylinder segment 1 and penetrate the concrete cylinder segment 2, ensuring the overall connection of the transition section connection 3, enhancing the integrity of the structure, and avoiding the difficulties of on-site prestressing tensioning caused by the full-length prestressed steel strands of the tower.

[0040] The size of the end plate 31 is the same as the size of the upper surface of the concrete cylinder segment 2. The height of the covered area of ​​the wall plate is 1 / 3 of the height of the uppermost concrete cylinder segment 2 connected to the steel cylinder segment 1, and is not less than the wall thickness of the concrete cylinder segment 2. The height design ensures the bonding strength between the steel interface and the concrete, and improves the tensile and shear strength.

[0041] The wall panel includes an inner wall panel 32 and an outer wall panel 33. The top of the concrete cylinder segment 2 is covered with an end plate 31, an inner wall panel 32, and an outer wall panel 33 on its upper surface, inner wall, and outer wall, respectively. The end plate 31, inner wall panel 32, and outer wall panel 33 of the transition section connection part 3 serve as permanent templates for the pouring of the concrete cylinder segment 2, transferring the stress of the entire cross section of the concrete cylinder segment 2 to the steel cylinder segment 1, increasing the overall rigidity of the structure, and preventing shear failure at the steel-concrete connection interface.

[0042] The inner diameter of the top of the concrete cylinder segment 2 remains unchanged, while the outer diameter gradually decreases from bottom to top, thus creating a gradual change in the cross-sectional dimensions of the concrete cylinder segment 2 and reducing abrupt changes in cross-sectional stress.

[0043] The end plate 31 is vertically connected to the inner wall plate 32, and the end plate 31 is connected to the outer wall plate 33 at an angle of 108°. The angle design ensures the bonding strength between the steel interface and the concrete, and improves the tensile and shear strength.

[0044] The bottom of the wall of the steel cylinder segment 1 is vertically connected to the base. The base is located inside the steel cylinder segment 1. The steel cylinder segment 1 is supported on the end plate 31 through the base. The base is a reserved space for the steel cylinder segment 1 to open holes and pass through the reinforcing bars 4.

[0045] Both the base and the end plate 31 are provided with screw holes. The reinforcing bar 4 passes through the screw holes of the base and the end plate 31. The reinforcing bar 4 is anchored to the base and the end plate 31 by anchor bolts to ensure the connection strength between the transition section connection part 3 and the steel cylinder section 1.

[0046] A washer 6 is provided at the anchor head end of the reinforcing bar 4 to reduce friction, and a protective cap 5 is screwed on to prevent rust.

[0047] Several sleeves 35 are arranged at equal intervals under the end plate 31. The sleeves 35 are embedded in the concrete cylinder section 2. The inner surface of the sleeves 35 is threaded. The reinforcing bar 4 passes through the sleeves 35. The internal thread of the sleeves 35 fixes the direction of the reinforcing bar 4, ensuring that the stress of the reinforcing bar 4 is uniformly and continuously transmitted to the concrete cylinder section 2 through the perforated plate 34.

[0048] The sleeve 35 is provided with perforated plates 34 on both sides. The perforated plates 34 are arranged radially along the tower tube and perpendicular to the end plate 31 and the wall plate, which increases the radial stiffness of the structure and prevents the structure from bending and deforming due to wind.

[0049] The transition section connection part 3, which is composed of steel structure, is assembled from prefabricated steel plates in the factory. The end plate 31, inner wall plate 32, outer wall plate 33, perforated plate 34 and sleeve 35 are all made of steel. The steel is Q335 or higher grade. In this embodiment, Q335 steel is preferred. The steel should be rust-proofed.

[0050] The steel bar 4 is made of HRB400 or higher grade steel, and in this embodiment, HRB400 steel is preferred.

[0051] In this invention, the perforated plate 34, end plate 31, inner wall plate 32 and outer wall plate 33 form a steel structure cell, which is combined with the top of the concrete cylinder segment 2 to enhance the overall rigidity of the structure. This prevents the structure from buckling in the radial direction, which would cause the transition section connection 3 to open and fail, and also prevents the structure from being subjected to torque in the circumferential direction, which would cause the structure to twist and deform.

[0052] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A connecting device for a steel-concrete transition section of an externally encased template-type tower, characterized in that, The steel cylinder segment (1) is positioned above the concrete cylinder segment (2). The steel cylinder segment (1) is mounted on the concrete cylinder segment (2) via a device to connect the steel cylinder segment (1) and the concrete cylinder segment (2). The device includes a transition section connection (3), which includes an end plate (31) and a wall plate. The top of the concrete cylinder section (2) is covered with the end plate (31) and the wall plate on its upper surface and cylinder wall, respectively. The steel cylinder section (1) is mounted on the end plate (31). Several perforated plates (34) are provided at equal intervals under the end plate (31). The perforated plates (34) are embedded in the concrete cylinder section (2) to provide the connection strength between the end plate (31) and the concrete cylinder section (2). The height of the perforated plates (34) is the anchorage length of the reinforcing bars (4) in the concrete cylinder section (2). The perforations ensure that the tensile force of the concrete cylinder section (2) is transmitted to the transition section connection part (3). Several reinforcing bars (4) pass through the bottom of the steel cylinder segment (1) and the device at equal intervals, and extend into the concrete cylinder segment (2). The reinforcing bars (4) are anchored at the lower end of the steel cylinder segment (1) and pass through the concrete cylinder segment (2) to ensure the overall connection of the transition section (3), enhance the integrity of the structure, and are not limited by the difficulty of on-site prestressing tensioning caused by the full-length prestressed steel strand. The size of the end plate (31) is the same as the size of the upper surface of the concrete cylinder segment (2). The height of the covering area of ​​the wall plate is 1 / 5 to 1 / 3 of the height of the uppermost concrete cylinder segment (2) connected to the steel cylinder segment (1), and is not less than the wall thickness of the concrete cylinder segment (2). The height design ensures the bonding strength between the steel interface and the concrete, and improves the tensile and shear strength. The inner diameter of the top of the concrete tube segment (2) remains unchanged, while the outer diameter gradually decreases from bottom to top. The cross-sectional dimensions of the concrete tube segment (2) gradually change, reducing the sudden change in cross-sectional stress. By using an embedded perforated plate (34) as a connector, the bond between the steel connection device and the concrete is improved, and the buckling deformation of the structure is prevented.

2. The external template-type steel-concrete transition section connection device for towers according to claim 1, characterized in that, The wall panel includes an inner wall panel (32) and an outer wall panel (33). The top of the concrete cylinder segment (2) is covered with an end plate (31), an inner wall panel (32), and an outer wall panel (33) on the upper surface, the inner wall, and the outer wall, respectively. The end plate (31), the inner wall panel (32), and the outer wall panel (33) of the transition section connection part (3) serve as permanent templates for the pouring of the concrete cylinder segment (2).

3. The external template-type steel-concrete transition section connection device for towers according to claim 2, characterized in that, The end plate (31) is vertically connected to the inner wall plate (32), and the end plate (31) is connected to the outer wall plate (33) at an angle not greater than 120°.

4. The external template-type steel-concrete transition section connection device for towers according to claim 1, characterized in that, The bottom of the wall of the steel cylinder segment (1) is vertically connected to the base. The base is located inside the steel cylinder segment (1). The steel cylinder segment (1) is mounted on the end plate (31) through the base.

5. The external template-type steel-concrete transition section connection device for towers according to claim 4, characterized in that, Both the base and the end plate (31) have screw holes. The reinforcing bar (4) passes through the screw holes of the base and the end plate (31) and is anchored to the base and the end plate (31) by anchor bolts.

6. The external template-type steel-concrete transition section connection device for towers according to claim 5, characterized in that, The reinforcing bar (4) is provided with a washer (6) at the anchor head end, and a protective cap (5) is screwed on the outside.

7. The external template-type steel-concrete transition section connection device for towers according to claim 1, characterized in that, A sleeve (35) is arranged under the end plate (31). The sleeve (35) is embedded in the concrete cylinder section (2). The inner surface of the sleeve (35) is threaded, and the reinforcing bar (4) passes through the sleeve (35).

8. The external template-type steel-concrete transition section connection device for towers according to claim 7, characterized in that, The sleeve (35) is provided with perforated plates (34) on both sides. The perforated plates (34) are arranged radially along the tower and perpendicular to the end plate (31) and the wall plate.

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