Steering support for reducing abrasion of prestressed steel strand of mixed tower

Abstract

The utility model relates to the technical field of wind tower buildings, and discloses a steering support for reducing abrasion of a prestressed steel strand of a mixed tower, which 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 utility model relates to the technical field of wind tower building, especially to a steering support for reducing the abrasion of prestressed steel strand of mixed tower. BACKGROUND

[0002] At present, under the background of the prevalence of global and Chinese wind power industry, the construction scale and quantity of wind turbine also increase year by year. Since 2021, the new generation of large-scale wind turbine units with high power, long blades and high tower drum have been significantly accelerated in China, and 5-6MW level land wind turbines have gone from prototype to batch, and 10MW offshore wind turbines have entered the stage of hoisting and grid connection. Larger wind turbines require higher heights to support. As a key component of wind turbine units, the tower drum shoulders the important mission of improving the height of the wind turbine and ensuring the safety of the unit. The main high tower drum solutions in China include all-steel flexible tower technology and mixed tower technology.

[0003] For ultra-high tower drums above 160m, the natural frequency of the all-steel flexible tower technology solution is low, and at the same time, due to the substantial rise of raw materials such as steel plates, the economy of the all-steel flexible tower technology solution is further reduced. With the continuous increase of tower height, compared with flexible steel towers, the mixed tower solution has the advantages of large overall structural stiffness and damping coefficient, which ensures that the unit amplitude is small during installation and full life cycle operation, ensures the stability of the impeller system wind angle, and makes the power generation more stable and greatly reduces the operation and maintenance cost, etc., making it an inevitable choice to improve the height of the wind turbine and ensure the reliable operation of the unit.

[0004] In the mixed tower structure, the prestressed system is an important part of the structure safety. At present, the prestressed system of mixed tower mostly adopts external prestress. In the prestressed system, the prestressed steel strand is not perpendicular to the ground, but changes along with the change of the shape of the tower structure. The performance of the steel strand can only be straightened, and cannot form a certain curve. For mixed towers that require a certain taper change, the steel strand and the tower wall form a surface contact at the mixed tower taper change, which increases the prestress loss and the steel strand abrasion, and also increases the stress of the tower body itself.

[0005] The utility model discloses a wind power mixed tower body outer prestressed steel strand's constraint turning device, and its constitutes as follows: including tower wall and steel strand, the steel strand turning of tower wall is equipped with section steel ring beam, and section steel ring beam is embedded in the tower wall through the steel bar anchoring, and section steel ring beam is equipped with the gap, and the section steel ring beam is equipped with the turning constraint ring, and the clamping of turning constraint ring and section steel ring beam is between, but this kind of mode mainly adopts the form of section steel ring beam and constraint ring, although the radial and annular constraint of cable body is realized, but the allowable deviation is less in radial and annular, in extreme case, it is possible to cause cable body to be in the optimal state, lead to the turning of too big or deviation too much, cause the damage to its strength, and this kind of connecting mode has the risk of deviation or falling off in the mixed tower operation process due to vibration. Utility model content

[0006] The application provides a turning support for reducing the wear of a mixed tower prestressed steel strand to solve the problems of the existing turning device, i.e., less allowable deviation in the radial and annular directions and damage to the strength of the steel strand.

[0007] To solve the above technical problems, the application provides a turning support for reducing the wear of a mixed tower prestressed steel strand, which comprises a tower wall and a steel strand arranged on the inner side of the tower wall; a turning adjusting mechanism is arranged between the tower wall and the steel strand, the turning adjusting mechanism comprises a base fixed to the tower wall, a support frame arranged on one side of the base, a rotating shaft arranged on the support frame, and a turning roller arranged on the rotating shaft; four corners of the base are provided with long-hole holes, bolts are arranged in the long-hole holes, bolt sleeves are embedded in the tower wall at the relative positions of the bolts, the bolts extend into the bolt sleeves to limit the displacement between the tower wall and the base, a head-hole pin is arranged through the support frame, the turning roller is arranged on the outer surface of the head-hole pin, and the steel strand is in contact with the outer surface of the turning roller.

[0008] In some embodiments of the application, the support frame comprises a long-rib plate fixed to the side of the base away from the tower wall, ear plates arranged at the two ends of the long-rib plate in the length direction, and rib plates arranged on the outer sides of the long-rib plate and the ear plates, the long-rib plates are arranged at intervals and are two in number, and the extension end of the ear plate is provided with a through hole.

[0009] In some embodiments of the application, the outer periphery of the turning roller is provided with an arc-shaped groove, the turning roller reduces the wear of the steel strand while achieving the purpose of turning the steel strand, and different sizes of turning rollers can be replaced to cope with the actual situation of steel strands of different diameters.

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

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

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

[0013] In some embodiments of the application, a positioning sleeve is arranged between the two sides of the turning roller and the ear plate, which can prevent the lateral displacement of the turning roller.

[0014] In some embodiments of the application, the steel strand is attached to the outer surface of the arc-shaped groove, which can effectively reduce the abrasion of the steel strand.

[0015] In some embodiments of the application, a method for using a turning support for reducing the abrasion of a mixed tower prestressed steel strand is provided, and the specific steps of the method are as follows: Step one, rust-proof treatment is performed on the base, the support frame and the turning roller before installation, the base, the support frame and the turning roller are installed at the positions of the embedded bolt sleeves according to the design requirements of the mixed tower of the wind turbine generator system, 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 two, after the installation of the base, the support frame and the turning roller is completed, the components are debugged and inspected, the rotation state of the turning roller is tested, the stress condition of the base and the support frame is checked, and the turning angle of the steel strand is fine-tuned by increasing or reducing the gaskets.

[0017] Step three, in order to ensure the long-term stable operation of the steel strand and the turning adjusting mechanism, regular maintenance and maintenance work is performed, the dust and debris on the surface of the base and the support frame are cleaned, the abrasion condition of the turning roller is checked, the loose bolts are tightened, the rotating parts are lubricated, and the rust-proof layer is repaired to prolong the service life.

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

[0019] The utility model discloses a steering adjusting mechanism can reduce the stress loss of steel strand turning place in prestressed steel strand system, slow down the loss speed of steel strand life, the utility model discloses simple and light structure is installed on the mixed tower wall, reduces the stress of mixed tower structure body itself, the utility model discloses the steering roller with arc groove of detachable, can cope with the case of using different specifications steel strand, through the corresponding roller of using to reach the purpose of reducing the installation gap of steel strand and steering adjusting mechanism, improve the stability of steel strand, the utility model discloses the installation form of gasket group is through the radial position of steering adjusting mechanism, realizes the angle adjustment of steel strand turning place, adapts the stress change in stress field, guarantees the stability of structure, the utility model discloses small, the steel consumption is little, and the production cost is low, and the popularization and use can produce better effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the steering adjusting mechanism and steel strand installation schematic drawing of the utility model embodiment;

[0021] Figure 2 It is the three-dimensional structure schematic drawing of the utility model embodiment steering adjusting mechanism;

[0022] Figure 3 It is the main view schematic drawing of the utility model embodiment steering adjusting mechanism;

[0023] Figure 4 It is the side view schematic drawing of the utility model embodiment steering adjusting mechanism;

[0024] Figure 5 It is the overhead schematic drawing of the utility model embodiment steering adjusting mechanism;

[0025] Figure 6 It is the arrangement schematic drawing of the utility model embodiment steering adjusting mechanism;

[0026] Figure 7 It is the arrangement overhead schematic drawing of the utility model embodiment steering adjusting mechanism.

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

[0028] The specific implementation of the utility model is described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0029] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the 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 particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0031] In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] As Figures 1-5 As shown in the figure, according to some embodiments of the present application, a diversion support for reducing the wear of prestressed steel strand of a mixing tower, comprising: a tower wall 100 and a steel strand 200 arranged inside the tower wall 100; a diversion adjusting mechanism 300 is arranged between the tower wall 100 and the steel strand 200, the diversion adjusting mechanism 300 comprises a base 310 fixed to the tower wall 100, a support frame 320 arranged on one side of the base 310, a rotating shaft 330 arranged on the support frame 320, a diversion roller 340 arranged on the rotating shaft 330, long holes 350 are arranged at the four corners of the base 310, bolts 360 are arranged in the long holes 350, bolt sleeves 400 are embedded in the tower wall 100 at the relative position of the bolts 360, the bolts 360 extend into the bolt sleeves 400, for limiting the displacement between the tower wall 100 and the base 310, a head belt hole pin 500 is arranged through the support frame 320, the diversion roller 340 is sleeved on the outer surface of the head belt hole pin 500, and the steel strand 200 contacts the outer surface of the diversion roller 340.

[0033] According to some embodiments of the present application, the support frame 320 comprises long rib plates 321 fixed to the base 310 away from the tower wall 100, ear plates 322 arranged at both ends of the long rib plates 321 in the length direction, and rib plates 323 arranged outside the long rib plates 321 and the ear plates 322, and the long rib plates 321 are arranged in two, and the extension 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 arranged on the outer periphery of the turning roller 340.

[0035] According to some embodiments of the present application, a pin shaft 510 is fixed to one end of the head hole pin 500, an open pin 520 is installed at the other end of the head 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 0.5mm, the angle adjusting gasket 600 is arranged as multiple according to the need, the thickness of the gasket group is controlled by adjusting the number of the angle adjusting gaskets 600, the position of the base 310 is controlled, the turning angle of the steel strand 200 is adjusted, and the turning angle of the steel strand 200 can be increased or decreased by 0.2° for each increase or decrease of the angle adjusting gasket 600.

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

[0038] According to some embodiments of the present application, the base 310 is arranged in multiple along the inner side of the tower wall 100.

[0039] According to some embodiments of the present application, the positioning sleeve 700 is arranged between the two sides of the turning roller 340 and the ear plate 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 application, a method for reducing the wear of a diversion support of a prestressed steel strand of a hybrid tower, the specific steps of the method are as follows: Step one, before installation, the base 310, support frame 320 and diversion roller 340 are treated for rust prevention, and the base 310, support frame 320 and diversion roller 340 are installed at the positions of the pre-buried bolt sleeve 400 according to the design requirements of the hybrid tower of the wind turbine generator system, and the installation 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 two, after the installation of the base 310, support frame 320 and diversion roller 340 is completed, the components are debugged and inspected, the rotation state of the diversion roller 340 is tested, the stress condition of the base 310 and support frame 320 is checked, and the diversion angle of the steel strand 200 is fine-tuned by increasing or decreasing the gasket;

[0043] Step three, to ensure the long-term stable operation of the steel strand 200 and the diversion adjusting mechanism 300, regular maintenance and maintenance work is carried out, the dust and debris on the surface of the base 310 and support frame 320 are cleaned, the wear condition of the diversion roller 340 is checked, the loose bolts 360 are tightened, the rotating parts are lubricated, and the rust-proof layer is repaired to prolong its service life.

[0044] According to some embodiments of the application, the angle-adjusting gasket 600 can be replaced by a plurality of nuts, the thicknesses of the plurality of nuts are consistent, the plurality of nuts correspond to the bolts 360 one by one, the thicknesses of the nuts are adjusted according to the diversion angle of the steel strand, or the change of the diversion angle of the steel strand is realized by the combination of the nuts and the gaskets.

[0045] According to some embodiments of the application, the structure of the diversion adjusting mechanism 300 is analyzed, in the prestressed steel strand 200 system, after the prestressed tensioning work of the steel strand 200 is completed, the steel strand 200 has a certain prestress. At the diversion roller 340, after the diversion work of the steel strand 200 is completed, there is a certain angle at the diversion, so the stress of 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, which is as follows: assuming that the initial tension of the steel strand 200 is 2000kN and the turning angle is 1°, then the stress of the diversion device N = 2000*sin1 = 35kN, and the diameter d of the pin shaft 510 is 20mm, the hole diameter d0 of the ear plate 322 is 22mm, the thickness t1 of the connecting vertical plate I is 16mm, the thickness t2 of the connecting vertical plate II is 16mm, the net edge distance a of the connecting vertical plate is 26mm, and the net edge distance b of the connecting vertical plate is 26mm, so:

[0046] 1. Pin shaft hole net section vertical plate tensile strength verification:

[0047]

[0048] Where f is the tensile strength design value, f = 250 N / mm 2

[0049] σ = 55.24 N / mm 2 ≤ 250 N / mm 2

[0050] 2. Tensile strength check of the bottom of the vertical plate:

[0051]

[0052] Where f is the tensile strength design value, f = 250 N / mm 2

[0053] σ = 93.78 N / mm 2 ≤ 250 N / mm 2

[0054] 3. Shear strength check of the bottom of the vertical plate:

[0055]

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

[0057] τ = 30.06 N / mm 2 ≤ 145 N / mm 2

[0058] 4. Bearing strength check of the pin shaft:

[0059]

[0060] Where is the bearing strength design value,

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

[0062] 5. Bearing strength check of the pin shaft:

[0063]

[0064] Where is the bearing strength design value,

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

[0066] 6. The bending strength of the pin shaft is checked:

[0067]

[0068] Wherein f b The design value of the bearing strength is f b = 300 N / mm 2

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

[0070] The experience calculation check, the design selection meets the requirement.

[0071] In conclusion, the utility model relates to the technical field of wind tower building, disclose a kind of steering support for reducing the abrasion of mixed tower prestressed steel strand, it include: tower wall and the steel strand being set in the inside of the tower wall;Steering adjusting mechanism is arranged between the tower wall and steel strand, the steering adjusting mechanism includes the base fixed on tower wall, the support frame being set in one side of base, the rotating shaft being set on the support frame, the steering drum being set on the rotating shaft, long hole is arranged in the four corners of the base, bolt is arranged in the long hole, bolt sleeve is embedded in the relative position of tower wall of bolt, bolt extends into bolt sleeve, for limiting the displacement between tower wall and base, head hole pin is threaded on the support frame, the steering drum is sleeved on the outer surface of head hole pin, the steel strand is contacted on the outer surface of steering drum, steering drum can reduce the stress loss at the bending place of prestressed steel strand system, slow down the loss speed of steel strand life.

[0072] The above is only preferred embodiment of the utility model, it should be pointed out, for ordinary skilled person in the art, without departing from the technical principle of the utility model, under the premise, can make several improvements and substitutions, these improvements and substitutions also should be regarded as the protection range of the utility model.

Claims

1. A steering support for reducing wear on prestressed steel strands in mixed-strain towers, comprising: A tower wall (100) and steel strands (200) disposed on the inner side of the tower wall (100); characterized in that a steering adjustment mechanism (300) is provided between the tower wall (100) and the steel strands (200), the steering adjustment mechanism (300) including a base (310) fixed on the tower wall (100), a support frame (320) disposed on one side of the base (310), a rotating shaft (330) disposed on the support frame (320), a steering roller (340) disposed on the rotating shaft (330), and four corners of the base (310) are provided with An elongated hole (350) is provided, and a bolt (360) is provided in the elongated hole (350). A bolt sleeve (400) is pre-embedded in the tower wall (100) opposite to the bolt (360). The bolt (360) extends into the bolt sleeve (400) to limit the displacement between the tower wall (100) and the base (310). A headband pin (500) is provided on the support frame (320). The steering roller (340) is sleeved on the outer surface of the headband pin (500). The steel strand (200) contacts the outer surface of the steering roller (340).

2. A steering support for reducing wear of prestressed steel strands in a mixed-strain tower according to claim 1, characterized in that, The support frame (320) includes a long rib plate (321) fixed to the side of the base (310) away from the tower wall (100), ear plates (322) disposed at both ends of the long rib plate (321) along its length, and rib plates (323) disposed on the outside of the long rib plate (321) and ear plates (322). The long rib plate (321) is spaced in pairs, and the extended end of the ear plate (322) is provided with a through hole.

3. A steering support for reducing wear of prestressed steel strands in a mixed-strain tower according to claim 2, characterized in that, The outer periphery of the steering roller (340) is provided with an arc-shaped groove, and the steel strand (200) is attached to the outer surface of the arc-shaped groove. Positioning sleeves (700) are provided between the two sides of the steering roller (340) and the ear plate (322).

4. A steering support for reducing wear of prestressed steel strands in a mixed-strain tower according to claim 1, characterized in that, One end of the headband pin (500) is fixed with a pin (510), and the other end of the headband pin (500) is fitted with a cotter pin (520). A large washer (530) is provided between the pin (510) and the adjacent ear plate (322).

5. A steering support for reducing wear of prestressed steel strands in a mixed-strain tower according to claim 1, characterized in that, An angle-adjusting shim (600) is provided between the base (310) and the tower wall (100), and the thickness of the angle-adjusting shim (600) is 0.5mm.

6. A steering support for reducing wear of prestressed steel strands in a mixed-strain tower according to claim 1, characterized in that, The base (310) is provided in multiple intervals along the inner side of the tower wall (100).

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