Connecting device for steel-concrete transition section of externally-wrapped formwork type tower drum

Abstract

The invention relates to an externally-wrapped formwork type tower tube reinforced concrete transition section connecting device, a steel tube section is arranged above a concrete tube section, the steel tube section is erected on the concrete tube section through the device, the device comprises a transition section connecting part, the transition section connecting part comprises an end plate and a wall plate, and the end plate and the wall plate are connected through a connecting piece. The upper surface and the cylinder wall of the top of the concrete cylinder section are coated with an end plate and a wall plate respectively, the steel cylinder section is erected on the end plate, a perforated plate is arranged below the end plate and is embedded in the concrete cylinder section, and a steel bar penetrates through the bottom of the steel cylinder section and the device and extends into the concrete cylinder section. Compared with the prior art, the connecting strength of the tower drum reinforced concrete transition section is improved, the stability of the structure is improved, and buckling deformation of the structure is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of super-high tower construction and relates to an external template type tower tube steel-concrete transition section connection device. Background Art

[0002] The power generation efficiency of wind turbine towers is positively correlated with the tower height. With the development of my country's energy engineering, wind turbine towers are gradually developing towards super-high towers. However, as the height increases, the structural characteristics of the tower itself also change towards a tall structure. The overall stiffness decreases while the load on the structure increases, resulting in wind damage and overturning of the tower itself. For this reason, super-high towers mostly use steel with lighter weight and higher mechanical strength on the upper layer, and a steel-concrete composite structure with concrete on the lower layer. Among them, the steel-concrete interface strength of the composite structure becomes the biggest factor affecting the structural safety and durability.

[0003] The existing steel-concrete joint section connection method is to cast in situ reinforced concrete, with a reserved steel pipe running through the prestressed steel bar, and the prestressing provides connection strength. This method requires the laying of formwork and on-site pouring, which has the characteristics of cumbersome construction procedures and long construction period. At the same time, the prestressed steel bar is an internal embedded part, and the construction quality is difficult to detect, which is not conducive to later operation and maintenance and replacement.

[0004] Patent CN108266330A discloses a prestressed steel-concrete tower of a wind turbine, wherein the bottom end of the top steel tower is provided with a flange structure, and the flange structure includes a flange plate, a stiffening plate and a pad; the prestressed steel strand passes through the flange plate, the pad, and the concrete tower conversion section, the upper end of the prestressed steel strand is anchored to the upper surface of the flange plate through a lock, and the lower end is connected to the disc-shaped foundation of the wind turbine steel-concrete tower; the flange plate and the pad are annular steel plates, the flange plate, the steel tower and the stiffening plate are welded to each other, and the annular pad is pre-buried at the top of the concrete tower conversion section as a concrete protection device; the flange plate and the pad are provided with a corresponding number of bolt holes and prestressed steel strand casing perforations. However, the patent adopts a structure of flange plate welding and pad pre-buried, and the connection interface is a steel plate-concrete connection. The connection strength needs to be provided by tensioning the 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.

[0005] Patent CN112832122A discloses a steel pier bottom consolidation structure for a small- and medium-span rigid frame bridge, including a steel pier and a foundation cap, wherein the lower end of the steel pier is consolidating with the foundation cap, and a steel shoe component is arranged at the bottom of the steel pier, wherein the steel shoe component is connected to one end of a slow-bonding prestressed steel strand, and the other end of the slow-bonding prestressed steel strand is embedded and fixed in the foundation cap, that is, the bottom of the steel pier is consolidating with the foundation cap through a plurality of slow-bonding prestressed steel strands. However, the steel shoe structure of the patent is an outsourced component, and in order to maintain the durability of the structure, the structural size must be increased on the basis of the original structure, resulting in a sudden change in the structural cross section. Summary of the invention

[0006] The purpose of the present invention is to overcome at least one defect of the above-mentioned prior art and to provide an externally wrapped template type tower steel-concrete transition section connection device, which increases the connection strength of the tower steel-concrete transition section, improves the stability of the structure, and prevents structural buckling and deformation.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] One of the technical solutions of the present invention is to provide a steel-concrete transition section connection device for an externally wrapped formwork tower, wherein the steel cylinder segment is arranged above the concrete cylinder segment, and the steel cylinder segment is mounted on the concrete cylinder segment through the device to realize the connection between the steel cylinder segment and the concrete cylinder segment.

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

[0010] A number of perforated plates are arranged at equal intervals under the end plate. The 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 steel bars in the concrete cylinder segment. The perforated plates ensure that the tensile force of the concrete cylinder segment is transmitted to the transition section connection.

[0011] Several steel bars are evenly spaced through the bottom and device of the steel cylinder segment and extend into the concrete cylinder segment. The steel bars are anchored at the lower end of the steel cylinder segment and penetrate the concrete cylinder segment to ensure the overall connection of the transition section connection, enhance the integrity of the structure, and avoid being limited by the difficulties of on-site prestressing caused by the full-height prestressed steel strands.

[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 panel is 1 / 5-1 / 3 of the height of the concrete cylinder segment connected to the top of the steel cylinder segment, and is 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 panels include inner wall panels and outer wall panels, and the top of the concrete cylinder segment is covered with end plates, inner wall panels and outer wall panels on the upper surface, the inner wall of the cylinder and the outer wall of the cylinder respectively. The end plates, inner wall panels and outer wall panels of the transition section connection portion serve as permanent formwork for casting the concrete cylinder segment, transferring the full-section stress of the concrete cylinder segment to the steel cylinder segment, thereby 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, and the outer diameter gradually decreases from bottom to top, so that the cross-sectional size of the concrete cylinder segment forms a gradual change, thereby reducing the sudden change of 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 not greater than 120°. The angle design ensures the bonding strength between the steel interface and the concrete, and improves the tensile and shear strengths.

[0016] Furthermore, the bottom of the wall of the steel cylinder segment is vertically connected to the base, the base is arranged on the inner side of the steel cylinder segment, the steel cylinder segment is mounted on the end plate through the base, and the base reserves space for opening holes in the steel cylinder segment and passing steel bars.

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

[0018] Furthermore, a washer is provided at the anchor head end of the steel bar to reduce friction, and a protective cap is screwed on the outside to prevent rust.

[0019] Furthermore, a plurality of sleeves are arranged at equal intervals under the end plate, and the sleeves are buried in the concrete cylinder segment. The inner surface of the sleeves is provided with threads, and the steel bars pass through the sleeves. The inner threads of the sleeves fix the direction of the steel bars, thereby ensuring that the stress of the steel bars is evenly and continuously transmitted to the concrete cylinder segment through the perforated plate.

[0020] Furthermore, perforated plates are provided on both sides of the sleeve, and the perforated plates are arranged along the radial direction of the tower, perpendicular to the end plates and the wall plates, so as to increase the radial rigidity of the structure and prevent the structure from being bent and deformed by wind-induced bending moment.

[0021] As a preferred technical solution, the transition section connection composed of a steel structure is assembled from prefabricated steel plates in a factory. The end plates, inner wall plates, outer wall plates, perforated plates and sleeves are all made of steel, and the steel should be treated to prevent rust.

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

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

[0024] (2) The present invention adopts a steel plate splicing structure, which has a simple structure, and the quality can be directly inspected by external appearance inspection in the later stage, and has the advantages of being detachable, easy to replace and easy to maintain;

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

[0026] (4) The present invention adopts an external steel structure connection, which can be used as a permanent template for prefabricated concrete segments, reducing the construction process and construction difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the transition section connecting portion in an embodiment of the present invention.

[0030] Description of the markings in the figure:

[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—perforated plate, 35—sleeve, 4—reinforcement bar, 5—protective cap, 6—washer. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, which only refer to different instances of the same object, and are not intended to imply that the objects described in this way must adopt a given order, whether in time, space, order or any other way.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example:

[0036] An external formwork tower steel-concrete transition section connection device is used for the combined transition connection of the steel cylinder segment 1 and the concrete cylinder segment 2 of the wind power tower, such as Figures 1 to 3 As shown, the steel cylinder segment 1 is arranged above the concrete cylinder segment 2, and the steel cylinder segment 1 is mounted on the concrete cylinder segment 2 through a device to realize the connection between the steel cylinder segment 1 and the concrete cylinder segment 2.

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

[0038] A number of perforated plates 34 are arranged at equal intervals under 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 steel bar 4 in the concrete cylinder segment 2. The perforated plates 34 ensure that the tensile force of the concrete cylinder segment 2 is transmitted to the transition section connection portion 3.

[0039] A number of steel bars 4 are evenly spaced through the bottom and the device of the steel cylinder segment 1 and extend into the concrete cylinder segment 2. The steel bars 4 are anchored at the lower end of the steel cylinder segment 1 and penetrate the concrete cylinder segment 2 to ensure the overall connection of the transition section connection 3, thereby enhancing the integrity of the structure and eliminating the difficulty of on-site prestressing caused by the full-tower high prestressed steel strands.

[0040] The size of the end plate 31 is the same as that of the upper surface of the concrete cylinder segment 2. The height of the covering area of ​​the wall plate is 1 / 3 of the height of the concrete cylinder segment 2 connected to the top of 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 panels include an inner wall panel 32 and an outer wall panel 33. The top of the concrete cylinder segment 2 is covered with an end panel 31, an inner wall panel 32 and an outer wall panel 33 on the upper surface, the inner wall and the outer wall of the cylinder respectively. The end panel 31, the inner wall panel 32 and the outer wall panel 33 of the transition section connection portion 3 serve as permanent formwork for pouring 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 of the steel-concrete connection interface.

[0042] The inner diameter of the top of the concrete cylinder segment 2 remains unchanged, and the outer diameter gradually decreases from bottom to top, so that the cross-sectional size of the concrete cylinder segment 2 changes gradually, thereby reducing the sudden change of 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, which is arranged on the inner side of the steel cylinder segment 1. The steel cylinder segment 1 is mounted on the end plate 31 through the base, and the base reserves space for opening a hole in the steel cylinder segment 1 to pass the steel bar 4;

[0045] Screw holes are provided in the base and the end plate 31, and the steel bars 4 pass through the screw holes of the base and the end plate 31. The steel bars 4 are 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 segment 1;

[0046] The steel bar 4 is provided with a washer 6 at the anchor head end to reduce friction, and a protective cap 5 is screwed on the outside to prevent rust;

[0047] A number of sleeves 35 are arranged at equal intervals under the end plate 31. The sleeves 35 are embedded in the concrete cylinder segment 2. The inner surface of the sleeves 35 is provided with threads. The steel bars 4 pass through the sleeves 35. The inner threads of the sleeves 35 fix the direction of the steel bars 4 to ensure that the stress of the steel bars 4 is evenly and continuously transmitted to the concrete cylinder segment 2 through the perforated plate 34.

[0048] Perforated plates 34 are provided on both sides of the sleeve 35. The perforated plates 34 are arranged along the radial direction of the tower and are perpendicular to the end plates 31 and the wall plates to increase the radial rigidity of the structure and prevent the structure from being flexed and deformed by the bending moment caused by wind.

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

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

[0051] In the present invention, the perforated plate 34, the end plate 31, the inner wall plate 32 and the 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, preventing the structure from being subjected to radial bending and buckling, which may cause the transition section connection part 3 to be opened and fail, and also preventing the structure from being subjected to circumferential torque, which may cause torsional deformation of the structure.

[0052] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and 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 present invention should be within the scope of protection of the present invention.

Claims

1. An external formwork tower steel-concrete transition section connection device, characterized in that: The steel cylinder segment (1) is arranged above the concrete cylinder segment (2). The steel cylinder segment (1) is mounted on the concrete cylinder segment (2) through a device. The device comprises a transition section connection part (3). The transition section connection part (3) comprises an end plate (31) and a wall plate. The top of the concrete cylinder segment (2) is covered with the end plate (31) and the wall plate on the upper surface and the cylinder wall respectively. The steel cylinder segment (1) is mounted on the end plate (31). A perforated plate (34) is arranged under the end plate (31). The perforated plate (34) is embedded in the concrete cylinder segment (2). The steel bars (4) pass through the bottom of the steel cylinder segment (1) and the device and extend into the concrete cylinder segment (2).

2. The external formwork tower steel-concrete transition section connection device according to claim 1 is characterized in that: The size of the end plate (31) is the same as that of the upper surface of the concrete cylinder segment (2), and the height of the covering area of ​​the wall plate is 1 / 5-1 / 3 of the height of the 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).

3. The external formwork tower steel-concrete transition section connection device according to claim 1 is characterized in that: The wall panels include an inner wall panel (32) and an outer wall panel (33); the top of the concrete cylinder segment (2) is covered with an end panel (31), an inner wall panel (32) and an outer wall panel (33) on the upper surface, the inner wall and the outer wall of the cylinder respectively; the end panel (31), the inner wall panel (32) and the outer wall panel (33) of the transition section connection portion (3) serve as permanent formwork for pouring the concrete cylinder segment (2).

4. The external formwork tower steel-concrete transition section connection device according to claim 3 is characterized in that: The inner diameter of the top of the concrete cylinder segment (2) remains unchanged, and the outer diameter gradually decreases from bottom to top, so that the cross-sectional size of the concrete cylinder segment (2) forms a gradual change.

5. The external formwork tower steel-concrete transition section connection device according to claim 4 is 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°.

6. The external formwork tower steel-concrete transition section connection device according to claim 1 is characterized in that: The bottom of the wall of the steel cylinder segment (1) is vertically connected to the base, the base is arranged on the inner side of the steel cylinder segment (1), and the steel cylinder segment (1) is mounted on the end plate (31) through the base.

7. The external formwork tower steel-concrete transition section connection device according to claim 6 is characterized in that: Screw holes are provided in the base and the end plate (31), and the steel bars (4) pass through the screw holes of the base and the end plate (31). The steel bars (4) are anchored to the base and the end plate (31) by anchor bolts.

8. The external formwork tower steel-concrete transition section connection device according to claim 7 is characterized in that: A washer (6) is provided at the anchor head end of the steel bar (4), and a protective cap (5) is screwed on the outside.

9. The external formwork tower steel-concrete transition section connection device according to claim 1, characterized in that: A sleeve (35) is arranged under the end plate (31), and the sleeve (35) is embedded in the concrete cylinder segment (2). The inner surface of the sleeve (35) is provided with a thread, and the steel bar (4) passes through the sleeve (35).

10. The external formwork tower steel-concrete transition section connection device according to claim 9, characterized in that: Perforated plates (34) are arranged on both sides of the sleeve (35). The perforated plates (34) are arranged along the radial direction of the tower and are perpendicular to the end plates (31) and the wall plates.

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