Wind power mixed tower prestressed steel strand steering device

Abstract

The utility model discloses a wind power mixed tower prestressed steel strand steering device, including sliding plate, front plate, web, rib and backboard, backboard is installed on the wind power mixed tower tower barrel wall, and the side of front plate is connected with backboard through web and a plurality of rib, and sliding plate is installed on the other side of front plate and keeps the distance with the wind power mixed tower tower barrel wall for supporting steel strand, the utility model discloses discarded the complex structure form of needing to pre -buried ring beam, multi -component assembly in traditional scheme, adopts the integrated metal structure frame of front plate, web, rib and backboard welding and constitutes integral device with polytetrafluoroethylene sliding plate. The quantity of structural component is few, and the connection relation is definite, and the stress path is direct, and the structural complexity is reduced significantly, avoids the connection loose risk caused by multi -component assembly, improves the structural stability and overall reliability of device under the long -term alternating load effect.

Description

Technical Field

[0001] This utility model relates to the technical field of prestressed steel strand installation in wind power mixed towers, and in particular to a turning device for prestressed steel strand in wind power mixed towers. Background Technology

[0002] In current wind turbine hybrid tower structures, the tower body is typically constructed from precast concrete sections connected by prestressed steel strands to collectively bear external wind loads. The prestressed steel strands are arranged along the inner or outer wall of the tower and, after tensioning, tightly press the sections together to form a unified load-bearing system. However, due to slight rotations that may occur between adjacent sections during installation or under load, the prestressed steel strands may locally adhere to the inner or outer wall of the tower under tension. Under the alternating load transmitted by the wind turbine, relative slippage occurs between the steel strands and the tower wall, leading to friction with grout overflow or protruding structures at the joints of the sections. This friction easily damages the outer sheath of the steel strands, causes seal failure, leads to grease leakage, and consequently results in steel strand corrosion and prestress loss, severely impacting the structure's durability and load-bearing capacity.

[0003] To alleviate the aforementioned problems, some studies have attempted to employ steel strand steering devices to maintain a certain distance between the steel strands and the tower wall in the corner area, thus avoiding grout overflow areas and reducing frictional damage. For example, Chinese utility model patent CN221168385U discloses a constraint steering device for external prestressed steel strands in a wind turbine hybrid tower. This device involves setting a steel ring beam pre-embedded in the concrete wall at the tower's steering position, and installing a steering constraint ring with a notch on the ring beam. The steel strands are guided and positioned through a snap-fit ​​mechanism. While this device can achieve a certain degree of separation between the steel strands and the tower wall, it restricts the lateral slippage of the steel strands on the steering device. This results in the steel strands being laterally constrained after the hybrid tower is subjected to stress, leading to increased stress and a higher risk of failure. Furthermore, its structure is relatively complex, with high manufacturing and installation costs. Under long-term alternating loads, there is a risk of loosening or detachment of the connection between the constraint ring and the steel ring beam. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a prestressed steel strand turning device for wind power hybrid towers. This device simplifies the structural form of the steel strand turning device, making the construction simpler and more reliable, the installation more convenient, and the production cost lower.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: a prestressed steel strand turning device for a wind power hybrid tower, comprising a sliding plate, a front plate, a web plate, ribs, and a back plate; the back plate is installed on the tower wall of the wind power hybrid tower, one side of the front plate is connected to the back plate through the web plate and multiple ribs, and the sliding plate is installed on the other side of the front plate and maintains a preset distance from the tower wall of the wind power hybrid tower for supporting the steel strands.

[0006] Furthermore, the sliding plate is a polytetrafluoroethylene plate with a friction coefficient of no more than 0.1.

[0007] Furthermore, the sliding plate is adhered to the other side of the front plate by adhesive.

[0008] Furthermore, the device includes countersunk bolts; the sliding plate is provided with a plurality of through holes that match the nut end of the countersunk bolts, and the front plate is provided with a plurality of threaded holes that match the screw end of the countersunk bolts, and the through holes and the threaded holes are connected by countersunk bolts.

[0009] Furthermore, the four corners of the front plate are chamfered, and the width of the sliding plate is greater than that of the front plate to avoid stress concentration when it is in contact with the steel strand.

[0010] Furthermore, the left and right sides of the web are connected to the front plate and the back plate respectively, and multiple ribs are installed on the upper and lower sides of the web at equal intervals and are connected to the front plate and the back plate respectively.

[0011] Furthermore, the device includes connecting bolts; the back plate is provided with a plurality of waist-shaped bolt holes, which are connected to the wind power hybrid tower wall through connecting bolts, and epoxy adhesive is provided between the back plate and the wind power hybrid tower wall.

[0012] Furthermore, the front plate, web plate, rib plate, and back plate are all metal plates, and the surfaces of the front plate, web plate, rib plate, and back plate are all provided with a corrosion-resistant layer.

[0013] Furthermore, the front plate, web plate, rib plate, and back plate are all made of Q355B structural steel plate.

[0014] Furthermore, the thickness of the sliding plate is 5mm.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] 1. This utility model abandons the complex structural form of traditional solutions that require pre-embedded ring beams and multi-component assembly. It adopts an integrated metal structural frame welded from a front plate, web plate, rib plate, and back plate, combined with a polytetrafluoroethylene sliding plate to form an overall device. The number of structural components is small, the connection relationships are clear, and the force path is direct. This significantly reduces structural complexity, avoids the risk of loose connections caused by multi-component assembly, and improves the structural stability and overall reliability of the device under long-term alternating loads.

[0017] 2. The front plate, web plate, ribs, and back plate are made of Q355B ordinary structural steel, which is low in material cost, widely available, and has mature welding technology, enabling mass production and factory prefabrication. The PTFE sliding plate is machined from standard sheet metal, with controllable processing precision and low cost.

[0018] 3. The back plate features oblong holes, allowing for positional adjustment to accommodate deviations in the joint positions of the cylinder sections and on-site installation errors. The connection method, employing back plate bonding and bolt anchoring, eliminates the need for on-site welding or high-precision positioning, simplifying installation, reducing on-site installation time, and significantly improving construction efficiency.

[0019] 4. The sliding plate and the front plate are fixed by a dual method of adhesive bonding and mechanical anchoring with countersunk bolts to prevent the adhesive layer from detaching due to aging or impact load.

[0020] 5. The PTFE sliding plate is 5mm thick. Combined with the thickness of the steel structure, this allows the centerline of the steel strand to be raised at least 80mm above the cylinder wall surface. The dry friction coefficient of PTFE is less than 0.1, far lower than that between the steel strand and concrete, significantly reducing frictional resistance during relative sliding. This effectively prevents grease leakage and wire corrosion, ensuring the long-term sealing and mechanical properties of the prestressed system.

[0021] 6. The device has a standardized structure, and its main dimensions can be modularly adjusted according to different tower diameters and steel strand arrangement angles. It is suitable for various wind power hybrid tower models, has good versatility and replicability, and is conducive to achieving standardized production of products. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a top view of the structure of this utility model.

[0024] Figure 3 This is a side view of the structure of this utility model.

[0025] Figure 4 This is a schematic diagram of the installation structure of the sliding plate and the front plate.

[0026] Figure 5 This is a schematic diagram of the chamfered structure of the front panel.

[0027] Figure 6 This is a schematic diagram of the back panel structure. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Example 1

[0031] See Figures 1 to 6 As shown, the wind power hybrid tower prestressed steel strand turning device provided in this embodiment includes a sliding plate 10, countersunk bolts 11, front plate 20, web plate 30, stiffening ribs 40, back plate 50, and back plate connecting bolts 51, forming an integral structure. It is suitable for hybrid towers with a diameter of 5621mm and is installed in the joint area of ​​concrete tower sections to guide the prestressed steel strands to turn smoothly and avoid direct friction between them and the tower wall.

[0032] The sliding plate 10 is made of pure polytetrafluoroethylene (PTFE) sheet, with a thickness of 5mm, a length of 490mm, and a width of 150mm. The sliding plate 10 has through holes that match the nut end of the countersunk bolt 11. The through holes have a trapezoidal cross-section for installing the countersunk bolt 11. The surface where the sliding plate 10 connects to the front plate 20 is ground to improve the bonding strength with the adhesive.

[0033] The front plate 20, web plate 30, rib plate 40, and back plate 50 are all made of Q355B hot-rolled steel plate with a thickness of 6mm. The front plate 20 is a rectangular plate with dimensions of 490mm × 100mm; the web plate 30 connects the front plate and the back plate, with a height of 63mm, and serves to transmit force; the rib plate 40 is a trapezoidal rib, symmetrically arranged on both sides of the web plate, used to enhance the bending stiffness of the web plate; the back plate 50 has dimensions of 505mm × 150mm, and has four 20mm diameter slotted bolt holes with a major diameter of 50mm in the longitudinal direction, used for the installation and adjustment of M16 connecting bolts 51.

[0034] All steel components are welded together using manual arc welding or CO2 gas shielded welding to achieve full penetration. The weld height is not less than 8mm. After welding, visual inspection and ultrasonic testing are performed to ensure there are no defects such as incomplete penetration or slag inclusions. After welding, the entire steel structure is sandblasted to Sa2.5 grade and then painted for rust prevention.

[0035] The sliding plate 10 is bonded to the front surface of the front plate 20 using a two-component epoxy structural adhesive, with the adhesive layer thickness controlled between 0.3 and 0.5 mm. After the adhesive has initially cured, an M6 stainless steel countersunk bolt 11 is passed through the through hole of the sliding plate and screwed into the M6 ​​threaded hole of the front plate to achieve mechanical anchoring.

[0036] Before installation, the back of the back plate 50 is locally ground and rust-removed to a roughness Ra≥50μm to enhance its adhesion to the concrete surface. During installation, after positioning the device, four M16 connecting bolts 51 are passed through the oblong bolt holes and anchored in the pre-reserved sleeve in the concrete cylinder wall.

[0037] Example 2

[0038] See Figures 1 to 6 As shown, unlike Example 1, the wind power hybrid tower prestressed steel strand turning device provided in this example is suitable for hybrid towers with a diameter of 6929mm.

[0039] The sliding plate 10 is made of pure polytetrafluoroethylene (PTFE) sheet, with a thickness of 5mm, a length of 626mm, and a width of 150mm. It has through holes on its surface that match the nut end of the countersunk bolt 11 for installation. The surface where the sliding plate 10 connects to the front plate 20 is polished to improve the bonding strength with the adhesive.

[0040] The front plate 20, web plate 30, rib plate 40, and back plate 50 are all made of Q355B hot-rolled steel plate with a thickness of 6mm. The front plate 20 is a rectangular plate with dimensions of 626mm × 100mm; the web plate 30 connects the front plate and the back plate, with a height of 63mm, and serves to transmit force; the rib plate 40 is a trapezoidal rib, symmetrically arranged on both sides of the web plate, used to enhance the bending stiffness of the web plate; the back plate 50 has dimensions of 641mm × 150mm, and has four 20mm diameter slotted bolt holes with a major diameter of 50mm in the longitudinal direction, used for the installation and adjustment of M16 back plate connecting bolts 51.

[0041] All steel components are welded together using manual arc welding or CO2 gas shielded welding to achieve full penetration. The weld height is not less than 8mm. After welding, visual inspection and ultrasonic testing are performed to ensure there are no defects such as incomplete penetration or slag inclusions. After welding, the entire steel structure is sandblasted to Sa2.5 grade and then painted for rust prevention.

[0042] The sliding plate 10 is bonded to the front surface of the front plate 20 using a two-component epoxy structural adhesive, with the adhesive layer thickness controlled between 0.3 and 0.5 mm. After the adhesive has initially cured, an M6 stainless steel countersunk bolt 11 is passed through the through hole of the sliding plate and screwed into the M6 ​​threaded hole on the front plate to achieve mechanical anchoring.

[0043] Before installation, the back of the back plate 50 is locally ground and rust-removed to a roughness Ra≥50μm to enhance its adhesion to the concrete surface. During installation, after positioning the device, four M16 connecting bolts 51 are passed through the oblong bolt holes and anchored in the pre-reserved sleeve in the concrete cylinder wall.

[0044] The above-described embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all changes made in accordance with the shape and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A wind power hybrid tower prestressed steel strand steering device, characterized in that: It includes a sliding plate, a front plate, a web plate, ribs, and a back plate; the back plate is installed on the tower wall of the wind turbine hybrid tower, one side of the front plate is connected to the back plate through the web plate and multiple ribs, and the sliding plate is installed on the other side of the front plate and maintains a preset distance from the tower wall of the wind turbine hybrid tower for supporting the steel strands.

2. The wind turbine hybrid tower prestressed steel strand turning device according to claim 1, characterized in that: The sliding plate is made of polytetrafluoroethylene (PTFE) and has a coefficient of friction of no more than 0.

1.

3. The wind power hybrid tower prestressed steel strand turning device according to claim 1, characterized in that: The sliding plate is attached to the other side of the front plate with adhesive.

4. A wind power hybrid tower prestressed steel strand turning device according to claim 3, characterized in that: It includes countersunk bolts; the sliding plate is provided with multiple through holes that match the nut end of the countersunk bolts, and the front plate is provided with multiple threaded holes that match the screw end of the countersunk bolts. The through holes and the threaded holes are connected by countersunk bolts.

5. A wind turbine hybrid tower prestressed steel strand turning device according to claim 1, characterized in that: The four corners of the front plate are chamfered, and the width of the sliding plate is greater than that of the front plate to avoid stress concentration when it is in contact with the steel strand.

6. A wind turbine hybrid tower prestressed steel strand turning device according to claim 1, characterized in that: The left and right sides of the web are connected to the front plate and the back plate, respectively. Multiple ribs are installed on the upper and lower sides of the web at equal intervals and are connected to the front plate and the back plate, respectively.

7. A wind turbine hybrid tower prestressed steel strand turning device according to claim 1, characterized in that: Includes connecting bolts; the back plate is provided with multiple waist-shaped bolt holes, which are connected to the wind power hybrid tower wall through connecting bolts, and epoxy adhesive is provided between the back plate and the wind power hybrid tower wall.

8. A wind turbine hybrid tower prestressed steel strand turning device according to claim 1, characterized in that: The front plate, web plate, rib plate and back plate are all metal plates, and the surfaces of the front plate, web plate, rib plate and back plate are all provided with a corrosion-resistant layer.

9. A wind turbine hybrid tower prestressed steel strand turning device according to claim 8, characterized in that: The front plate, web plate, rib plate, and back plate are all made of Q355B structural steel plate.

10. A wind turbine hybrid tower prestressed steel strand turning device according to claim 1, characterized in that: The thickness of the sliding plate is 5mm.

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