Prestressed steel strand steering support of mixed tower and using method of prestressed steel strand steering support

Abstract

The invention relates to the technical field of wind tower buildings, and discloses a prestressed steel strand steering support of a mixed tower and a using method of the prestressed steel strand steering support, and the prestressed steel strand steering support comprises a tower wall and a steel strand arranged on the inner side of the tower wall; a steering adjusting mechanism is arranged between the tower wall and the steel strand and comprises a base fixed to the tower wall, a supporting frame arranged on one side of the base, a rotating shaft arranged on the supporting frame and a steering roller arranged on the rotating shaft, long-strip-shaped holes are formed in the four corners of the base, and bolts are arranged in the long-strip-shaped holes. Bolt sleeves are embedded in the positions, opposite to the bolts, of the tower wall, the bolts extend into the bolt sleeves and are used for limiting displacement between the tower wall and the base, headband hole pins are arranged on the supporting frames in a penetrating mode, the steering roller is arranged on the outer surfaces of the headband hole pins in a sleeving mode, and the steel strands make contact with the outer surfaces of the steering roller. The steering roller can reduce the stress loss at the turning position of the steel strand in the prestressed steel strand system and slow down the loss speed of the service life of the steel strand.

Description

Technical Field

[0001] The invention relates to the technical field of wind tower construction, and in particular to a prestressed steel strand turning support of a mixed tower and a use method thereof. Background Art

[0002] At present, with the prevalence of wind power industry in the world and my country, the construction scale and number of wind turbines are also increasing year by year. Since 2021, the domestic large-scale wind turbines with high power, long blades and high towers have been significantly accelerated. 5-6MW onshore wind turbines have gone from prototypes to batch production, and offshore 10MW wind turbines have also entered the hoisting and grid-connected stage. Larger wind turbines require higher heights to support them. As a key component of wind turbines, the tower shoulders the important mission of increasing the height of wind turbines and ensuring the safety of the units. The mainstream high tower solutions in China include all-steel flexible tower technology and hybrid tower technology.

[0003] For ultra-high towers above 160m, the all-steel flexible tower technology solution has a low self-vibration frequency. At the same time, the sharp rise in raw materials such as steel plates has further reduced the economic efficiency of the all-steel flexible tower technology solution. As the tower height continues to increase, the hybrid tower solution has greater overall structural rigidity and a larger damping coefficient than the flexible steel tower, ensuring that the unit has a small amplitude during installation and the entire life cycle, ensuring the windward angle of the impeller system is stable, the power generation is more stable, and the operation and maintenance costs are greatly reduced, making it an inevitable choice for increasing the height of the wind turbine and ensuring the reliable operation of the unit.

[0004] In the mixed tower structure, the prestressing system is an important component related to the structural safety. At present, most of the prestressing systems of mixed towers use external prestressing. In the prestressing system, the prestressed steel strands are not all perpendicular to the ground, but change along the shape of the tower structure. The performance of the steel strands makes it only straightened and cannot form a certain curve. For mixed towers that require a certain taper change, the steel strands form surface contact with the tower wall at the point where the taper changes, which increases the prestress loss and steel strand wear, and at the same time increases the force on the tower body itself.

[0005] The utility model patent with the patent number CN221168385U and the name of "A constraint and steering device for external prestressed steel strands of a wind power hybrid tower" discloses a constraint and steering device for external prestressed steel strands of a wind power tower cylinder, which is composed as follows: it includes a tower wall and a steel strand, a steel ring beam is provided at the turning point of the steel strand of the tower wall, the steel ring beam is pre-embedded in the tower wall through steel bar anchoring, the steel ring beam is provided with a notch, a steering constraint ring is provided on the steel ring beam, and the steering constraint ring is clamped with the steel ring beam; however, this method mainly adopts the form of a steel ring beam and a constraint ring. Although radial and circumferential constraints are achieved on the cable body, the allowable radial and circumferential offsets are small. In extreme cases, it may cause the cable body to be unable to be in the optimal state, resulting in excessive turning or excessive offset, causing damage to its strength. At the same time, this connection method has the risk of offset or falling off due to vibration during the operation of the hybrid tower. Summary of the invention

[0006] The present application provides a prestressed steel strand steering support for a mixed tower and a method of using the same, in order to solve the problem that the existing steering device has a small allowable offset in the radial and circumferential directions and causes damage to the strength of the steel strand.

[0007] In order to solve the above technical problems, the present application provides a prestressed steel strand steering support for a mixed tower, comprising: a tower wall and a steel strand arranged on the inner side of the tower wall; a steering adjustment mechanism is arranged between the tower wall and the steel strand, the steering adjustment mechanism comprises a base fixed on the tower wall, a support frame arranged on one side of the base, a rotating shaft arranged on the support frame, and a steering roller arranged on the rotating shaft, the four corners of the base are provided with long holes, bolts are arranged in the long holes, bolt sleeves are pre-embedded in the tower wall at the relative position of the bolts, the bolts extend into the bolt sleeves, and are used to limit the displacement between the tower wall and the base, a head band hole pin is pierced on the support frame, the steering roller is sleeved on the outer surface of the head band hole pin, and the steel strand contacts the outer surface of the steering roller.

[0008] In some embodiments of the present application, the support frame includes a long rib fixed to a side of the base away from the tower wall, ear plates arranged at both ends of the long rib in the length direction, and ribs arranged on the outside of the long rib and the ear plates, the long ribs are arranged to be spaced in two, and the extending ends of the ear plates are provided with through holes.

[0009] In some embodiments of the present application, an arc-shaped groove is provided on the outer periphery of the turning roller, which reduces the loss of the steel strand while completing the purpose of steering the steel strand. The actual situation of steel strands with different diameters can be coped with by replacing turning rollers of different sizes.

[0010] In some embodiments of the present application, a pin shaft is fixed to one end of the headband hole pin, a cotter pin is installed at the other end of the headband hole pin, and a large gasket is arranged between the pin shaft and the adjacent ear plate.

[0011] In some embodiments of the present application, an angle adjustment gasket is provided between the base and the tower wall, and the thickness of the angle adjustment gasket is 0.5 mm.

[0012] In some embodiments of the present application, the base is arranged in plurality along the inner side surface of the tower wall at intervals, and the number of the bases and the number of the steel strands are in a one-to-one correspondence.

[0013] In some embodiments of the present application, positioning sleeves are provided between the two sides of the steering roller and the ear plates to prevent lateral displacement of the steering roller.

[0014] In some embodiments of the present application, the steel strands are fitted to the outer surface of the arc-shaped groove, which can effectively reduce the wear of the steel strands.

[0015] In some embodiments of the present application, a method for using a prestressed steel strand turning support of a mixed tower is provided, and the specific steps of the method are as follows: Step 1, before installation, the base, the support frame and the turning roller are subjected to rust prevention treatment, and the base, the support frame and the turning roller are installed at the position of the embedded bolt sleeve according to the design requirements of the mixed tower frame of the wind turbine generator set, and the installation base is fixed by bolts to ensure that the connection between the base and the tower wall is firm and reliable;

[0016] Step 2: After the installation of the base, support frame and steering roller is completed, the components are debugged and inspected, the rotation state of the steering roller is tested, the stress of the base and support frame is checked, and the steering angle of the steel strand is fine-tuned by adding or reducing gaskets;

[0017] Step three, to ensure the long-term stable operation of the steel strand and steering adjustment mechanism, regular maintenance and care work should be carried out. During maintenance, dust and debris on the surface of the base and support frame should be cleaned, the wear of the steering roller should be checked, loose bolts should be tightened, rotating parts should be lubricated, and the anti-rust layer should be repaired to extend its service life.

[0018] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0019] The present invention utilizes a steering adjustment mechanism to reduce stress loss at the turning point of the steel strand in a prestressed steel strand system and slow down the rate of loss of steel strand life. The present invention has a simple and light structure and is installed on the wall of a mixed tower to reduce the stress on the mixed tower structure itself. The present invention adopts a detachable steering roller with an arc-shaped groove, which can cope with the situation of using steel strands of different specifications. By using corresponding rollers, the installation gap between the steel strand and the steering adjustment mechanism is reduced, and the stability of the steel strand is improved. The present invention adopts the installation form of a gasket group, and the radial position of the steering adjustment mechanism is used to achieve angle adjustment of the turning point of the steel strand, adapt to stress changes in the stress field, and ensure the stability of the structure. The present invention has a small size, a small amount of steel used, and a low manufacturing cost. Popularization and use can produce better results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the installation of the steering adjustment mechanism and the steel strand according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the three-dimensional structure of the steering adjustment mechanism according to an embodiment of the present invention;

[0022] Figure 3 is a front view schematic diagram of a steering adjustment mechanism according to an embodiment of the present invention;

[0023] Figure 4 is a side view schematic diagram of a steering adjustment mechanism according to an embodiment of the present invention;

[0024] Figure 5 is a top view schematic diagram of a steering adjustment mechanism according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the installation of the steering adjustment mechanism according to an embodiment of the present invention;

[0026] Figure 7 It is a top view schematic diagram of the installation of the steering adjustment mechanism according to an embodiment of the present invention.

[0027] In the figure, 100, tower wall; 200, steel strand; 300, steering adjustment mechanism; 310, base; 320, support frame; 321, long rib; 322, ear plate; 323, rib; 330, rotating shaft; 340, steering roller; 350, long hole; 360, bolt; 400, bolt sleeve; 500, head band hole pin; 510, pin shaft; 520, cotter pin; 530, large gasket; 600, angle adjustment gasket; 700, positioning sleeve. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0031] In the description of this application, 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 this application can be understood according to specific circumstances.

[0032] like Figure 1-5 As shown, according to some embodiments of the present application, a prestressed steel strand steering support of a mixed tower includes: a tower wall 100 and a steel strand 200 arranged on the inner side of the tower wall 100; a steering adjustment mechanism 300 is arranged between the tower wall 100 and the steel strand 200, and the steering adjustment mechanism 300 includes a base 310 fixed on the tower wall 100, a support frame 320 arranged on one side of the base 310, a rotating shaft 330 arranged on the supporting frame 320, and a steering roller arranged on the rotating shaft 330 340, the four corners of the base 310 are provided with long holes 350, and bolts 360 are arranged in the long holes 350. The tower wall 100 at the relative position of the bolt 360 is pre-embedded with a bolt sleeve 400. The bolt 360 extends into the bolt sleeve 400 to limit the displacement between the tower wall 100 and the base 310. The support frame 320 is pierced with a head band hole pin 500, and the steering drum 340 is sleeved on the outer surface of the head band hole pin 500, and the steel strand 200 contacts the outer surface of the steering drum 340.

[0033] According to some embodiments of the present application, the support frame 320 includes a long rib 321 fixed to the side of the base 310 away from the tower wall 100, ear plates 322 arranged at both ends of the long rib 321 in the length direction, and ribs 323 arranged on the outside of the long rib 321 and the ear plate 322, the long rib 321 is arranged in two at intervals, and the extending end of the ear plate 322 is provided with a through hole.

[0034] According to some embodiments of the present application, an arc-shaped groove is provided on the outer circumference of the turning drum 340 .

[0035] According to some embodiments of the present application, a pin shaft 510 is fixed to one end of the headband hole pin 500 , a cotter pin 520 is installed to the other end of the headband hole pin 500 , and a large gasket 530 is arranged between the pin shaft 510 and the adjacent ear plate 322 .

[0036] According to some embodiments of the present application, an angle adjusting gasket 600 is arranged between the base 310 and the tower wall 100. The thickness of the angle adjusting gasket 600 is 0.5 mm. The angle adjusting gasket 600 is set to be multiple as needed. By adjusting the number of the angle adjusting gaskets 600 and controlling the thickness of the gasket group, the position of the base 310 can be controlled, and the turning angle of the steel strand 200 can be adjusted. For each increase or decrease of an angle adjusting gasket 600, the turning angle of the steel strand 200 can increase or decrease by 0.2°.

[0037] According to some embodiments of the present application, the base 310 is made of Q355 material, the steering roller 340 is made of 42CrMo material, and a flexible protective lining is pasted on the outside of the steering roller 340 to protect the 200PE sheath of the steel strand, the sleeve and the positioning sleeve 700 are made of Q355 material, the headband hole pin 500 is of model GB / T882 and uses 45# material, the large gasket 530 is of model GB / T96.2-2002, 200Hv, the open pin 520 is of model GB / T91-2000, and the angle adjustment gasket 600 is made of Q355 material.

[0038] According to some embodiments of the present application, a plurality of bases 310 are arranged at intervals along the inner side surface of the tower wall 100 .

[0039] According to some embodiments of the present application, positioning sleeves 700 are disposed between both sides of the turning roller 340 and the ear plates 322 .

[0040] According to some embodiments of the present application, the steel strand 200 is attached to the outer surface of the arc-shaped groove.

[0041] According to some embodiments of the present application, a method for using a prestressed steel strand turning support of a mixed tower is provided, and the specific steps of the method are as follows: Step 1, before installation, the base 310, the support frame 320 and the turning roller 340 are subjected to rust prevention treatment, and the base 310, the support frame 320 and the turning roller 340 are installed at the position of the embedded bolt sleeve 400 according to the design requirements of the mixed tower frame of the wind turbine generator set, and the installed base 310 is fixed by bolts 360 to ensure that the connection between the base 310 and the tower wall 100 is firm and reliable;

[0042] Step 2: After the installation of the base 310, the support frame 320 and the steering drum 340 is completed, the components are debugged and inspected, the rotation state of the steering drum 340 is tested, the stress conditions of the base 310 and the support frame 320 are checked, and the steering angle of the steel strand 200 is fine-tuned by adding or reducing gaskets;

[0043] Step three, to ensure the long-term stable operation of the steel strand 200 and the steering adjustment mechanism 300, regular maintenance and care work is performed. During maintenance, dust and debris on the surface of the base 310 and the support frame 320 are cleaned, the wear of the steering roller 340 is checked, the loose bolts 360 are tightened, the rotating parts are lubricated, and the anti-rust layer is repaired to extend its service life.

[0044] According to some embodiments of the present application, the steering adjustment mechanism 300 is structurally analyzed. In the prestressed steel strand 200 system, after the prestressing tensioning work of the steel strand 200 is completed, the steel strand 200 has a certain prestress. At the steering roller 340, after the steering work of the steel strand 200 is completed, there is a certain angle at the steering position, so the force on the support frame 320 and the base 310 should be the component force of the prestress in the steel strand 200 along the turning angle, as follows: Assuming that the initial tension of the steel strand 200 is 2000kN and the turning angle is 1°, then the steering device is subjected to a force N=2000*s in1=35kN, and the pin 510 diameter d=20mm / ear plate 322 through hole aperture d0=22mm / connecting vertical plate I thickness t1=16mm / connecting vertical plate II thickness t2=16mm / connecting vertical plate net margin a=26mm / connecting vertical plate net margin b=26mm, then:

[0045] 1. Calculation of tensile strength of the vertical plate with net cross section of the pin hole:

[0046]

[0047] Where f is the design value of tensile strength, f = 250N / mm 2

[0048] σ=55.24N / mm 2 ≤250N / mm 2

[0049] 2. Calculation of tensile strength of the bottom of the vertical plate:

[0050]

[0051] Where f is the design value of tensile strength, f = 250N / mm 2

[0052] σ=93.78N / mm 2 ≤250N / mm 2

[0053] 3. Calculation of shear strength at the bottom of the vertical plate:

[0054]

[0055]

[0056] where f v is the design value of shear strength, f = 250N / mm 2

[0057] τ=30.06N / mm 2 ≤145N / mm 2

[0058] 4. Calculation of the bearing strength of the pin:

[0059]

[0060] in is the design value of compressive strength,

[0061] σ c =106.25N / mm 2 ≤400N / mm 2

[0062] 5. Calculation of the bearing strength of the pin:

[0063]

[0064] in is the design value of compressive strength,

[0065] τ b =54.14N / mm 2 ≤175N / mm 2

[0066] 6. Calculation of bending strength of pin:

[0067]

[0068] where f b is the design value of compressive strength, f b =300N / mm 2

[0069] σ b =46.78N / mm 2 ≤300N / mm 2

[0070] Based on empirical calculation and verification, the design selection meets the requirements.

[0071] In summary, the present invention relates to the technical field of wind tower construction, and discloses a prestressed steel strand steering support of a mixed tower and a method of using the same, comprising: a tower wall and a steel strand arranged on the inner side of the tower wall; a steering adjustment mechanism is arranged between the tower wall and the steel strand, and the steering adjustment mechanism comprises a base fixed on the tower wall, a support frame arranged on one side of the base, a rotating shaft arranged on the support frame, and a steering roller arranged on the rotating shaft, and the four corners of the base are provided with long holes, and bolts are arranged in the long holes. Bolt sleeves are pre-embedded in the tower wall at the relative position of the bolts, and the bolts extend into the bolt sleeves to limit the displacement between the tower wall and the base, and a head band hole pin is pierced on the support frame, and the steering roller is sleeved on the outer surface of the head band hole pin, and the steel strand contacts the outer surface of the steering roller, and the steering roller can reduce the stress loss at the turning point of the steel strand in the prestressed steel strand system, and slow down the loss rate of the life of the steel strand.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A prestressed steel strand turning support for a mixed tower, comprising: The invention relates to a tower wall (100) and a steel strand (200) arranged on the inner side of the tower wall (100); characterized in that a steering adjustment mechanism (300) is arranged between the tower wall (100) and the steel strand (200), and the steering adjustment mechanism (300) comprises a base (310) fixed on the tower wall (100), a support frame (320) arranged on one side of the base (310), a rotating shaft (330) arranged on the supporting frame (320), and a steering roller (340) arranged on the rotating shaft (330), and the four corners of the base (310) are provided with A long hole (350) is provided, a bolt (360) is arranged in the long hole (350), a bolt (360) sleeve is pre-embedded in the tower wall (100) at a position opposite to the bolt (360), the bolt (360) extends into the bolt (360) sleeve, and is used to limit the displacement between the tower wall (100) and the base (310), a head band hole pin (500) is passed through the support frame (320), the steering roller (340) is sleeved on the outer surface of the head band hole pin (500), and the steel strand (200) contacts the outer surface of the steering roller (340).

2. The prestressed steel strand turning support of a mixed tower according to claim 1, characterized in that: The support frame (320) comprises a long rib plate (321) fixed to a side of the base (310) away from the tower wall (100), ear plates (322) arranged at both ends of the long rib plate (321) in the length direction, and rib plates (323) arranged on the outside of the long rib plate (321) and the ear plates (322), the long rib plates (321) are arranged at intervals of two, and the extended ends of the ear plates (322) are provided with through holes.

3. The prestressed steel strand turning support of a mixed tower according to claim 1, characterized in that: The outer circumference of the turning roller (340) is provided with an arc-shaped groove.

4. The prestressed steel strand turning support of a mixed tower according to claim 2, characterized in that: A pin shaft (510) is fixed to one end of the headband hole pin (500), a cotter pin (520) is installed to the other end of the headband hole pin (500), and a large gasket (530) is arranged between the pin shaft (510) and the adjacent ear plate (322).

5. The prestressed steel strand turning support of a mixed tower according to claim 1, characterized in that: An angle adjustment gasket (600) is provided between the base (310) and the tower wall (100), and the thickness of the angle adjustment gasket (600) is 0.5 mm.

6. The prestressed steel strand turning support of a mixed tower according to claim 1, characterized in that: A plurality of bases (310) are arranged at intervals along the inner side surface of the tower wall (100).

7. The prestressed steel strand turning support of a mixed tower according to claim 2, characterized in that: Positioning sleeves (700) are arranged between the two sides of the turning roller (340) and the ear plates (322).

8. The prestressed steel strand turning support of a mixed tower according to claim 3, characterized in that: The steel strand (200) is attached to the outer surface of the arc-shaped groove.

9. The method for using the prestressed steel strand turning support of a mixed tower according to any one of claims 1 to 8, characterized in that: The specific steps of the method are as follows: Step 1, before installation, the base (310), the support frame (320) and the steering roller (340) are subjected to rust prevention treatment, and the base (310), the support frame (320) and the steering roller (340) are installed at the position of the pre-embedded bolt (360) sleeve according to the design requirements of the wind turbine generator hybrid tower frame itself, and the installation base (310) is fixed by the bolt (360) to ensure that the connection between the base (310) and the tower wall (100) is firm and reliable; Step 2: After the installation of the base (310), the support frame (320) and the steering roller (340) is completed, the components are debugged and inspected, the rotation state of the steering roller (340) is tested, the stress conditions of the base (310) and the support frame (320) are checked, and the steering angle of the steel strand (200) is fine-tuned by adding or reducing gaskets; Step 3: To ensure the long-term stable operation of the steel strand (200) and the steering adjustment mechanism (300), regular maintenance and servicing are performed. During maintenance, dust and debris on the surface of the base (310) and the support frame (320) are cleaned, the wear of the steering roller (340) is checked, loose bolts (360) are tightened, rotating parts are lubricated, and the anti-rust layer is repaired to extend their service life.

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