Adjustable air permeability fence

Abstract

The application belongs to the technical field of bridge engineering and provides a fence with adjustable ventilation rate, which comprises a railing and a lifting base, wherein the lifting base is arranged on a bridge and the railing is arranged on the lifting base; the fence with adjustable ventilation rate further comprises an anemograph; the lifting base comprises a base body and a lifting section, the lifting section is rotationally arranged on the base body and is used for stretching and retracting in the up-down direction, and the lifting section is provided with a ventilation device; the lifting section is rotated and / or retracted according to the wind speed detected by the anemograph, so that the lifting section reaches a preset rotation angle and / or a preset height, thereby changing the ventilation rate of the fence. The application has the beneficial effect that the ventilation rate of the whole lifting base is improved by controlling the rotation and / or retraction of the lifting section, so that the whole fence can adapt to multi-stage vortex vibration and effectively suppress the generation of large-amplitude vortex vibration in different locked wind speed zones.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a fence with adjustable ventilation rate. Background Technology

[0002] Vortex-induced vibration refers to the periodic shedding of vortices as airflow passes around a bluff body structure, generating periodically alternating vortex-induced forces. Due to the dense vertical bending modes in long-span bridges, multi-order vertical modal vortex-induced resonance is easily induced. The vortex-induced vibration problem of bridges has become a primary consideration in the construction of long-span bridges, especially the limitation of large amplitude of high-order vortices.

[0003] In the field of bridge engineering, there are two main approaches to suppressing vortex-induced vibration: one is to increase the overall structural damping of the bridge, and the other is to improve the aerodynamic shape of the bridge, such as by adding additional fairings. Regarding improving the aerodynamic shape of bridges, patent CN 106758774A discloses a vortex-suppressing grid device for controlling vortex-induced vibration in wide-span separated double-box girder bridges; patent CN 108035237A discloses a wing plate system and its control method for suppressing bridge flutter and vortex-induced vibration. Although these two patents suppress vortex-induced vibration by improving the shape of the box girder and adding wing plates, respectively, vortex-induced vibration is highly sensitive to the detailed structural details of the main girder section. Some bridges experience severe vortex-induced vibration simply by adding approximately 1.2m high water-filled barriers on both sides. Therefore, neither of these patents considers that fixed structures on the box girder, such as guardrails and guardrail bases, can also have a certain impact on the overall aerodynamics of the bridge. Currently, the railing bases for both the driving lanes and maintenance walkways on bridges are fixed installations. Once built, their shape and position cannot be changed. Although the existing railing bases may play a role in suppressing a certain type of vortex-induced vibration in a certain wind speed range, their effect on controlling other types of vortex-induced vibration is not good. They lack controllability and universality and cannot meet the needs of multi-stage vortex-induced vibration control in actual bridge engineering.

[0004] Therefore, there is still room for improvement in existing technologies. Summary of the Invention

[0005] An adjustable ventilation enclosure for installation on a bridge, comprising:

[0006] railing;

[0007] A lifting base is installed on the bridge, and railings are installed on the lifting base.

[0008] The adjustable ventilation enclosure also includes: an anemometer;

[0009] The lifting base includes: a base body;

[0010] The lifting section is rotatably mounted on the base body and is used for extension and retraction in the vertical direction. A ventilation device is provided on the lifting section.

[0011] The lifting joint is rotated and / or extended according to the wind speed detected by the anemometer, so that the lifting joint reaches a preset angle and / or preset height, thereby changing the air permeability of the ventilation device.

[0012] The lifting base also includes:

[0013] A rotary drive unit is connected to the base body;

[0014] The telescopic drive unit is connected to the rotary drive unit and rotates under the drive of the rotary drive unit;

[0015] The lifting section is connected to the telescopic drive unit and extends or retracts by being driven by the telescopic drive unit.

[0016] The lifting joint includes:

[0017] The top section has ventilation devices on each side along its axial direction, and the ventilation rates of the ventilation devices on each side along its axial direction are different.

[0018] The intermediate section and the top section are fitted inside the intermediate section. Ventilation devices are provided on each side of the intermediate section along the axial direction, and the ventilation rate of the ventilation devices on each side of the intermediate section along the axial direction is different.

[0019] The base section and the intermediate section are fitted inside the base section. Ventilation devices are provided on each side of the base section along the axial direction, and the ventilation rate of the ventilation devices on each side of the base section along the axial direction is different.

[0020] The top section includes: a top section body, and a first locking lug connected to the top section body. The first locking lug is connected to the intermediate section and drives the intermediate section to move upward by the upward movement of the top section body. The top section body moves upward by the drive of the telescopic drive unit.

[0021] The intermediate segment includes: the intermediate segment body, and a second locking lug connected to the intermediate segment body. The second locking lug is connected to the basal segment and drives the basal segment to move upward by the upward movement of the intermediate segment body.

[0022] The apical section also includes:

[0023] The mounting section is located on the upper surface of the top section body and is used to connect the railing.

[0024] The rotary drive unit includes:

[0025] The base has a telescopic drive unit mounted on it.

[0026] And a drive motor, which is mounted on the base and is rotatably connected to the base.

[0027] The base body includes:

[0028] The protective cover and the lifting joint are connected to the protective cover;

[0029] And the bottom shell, which is detachably attached to the bottom of the protective cover.

[0030] The railings include:

[0031] At least two standard railing sections, with fixed connections between them;

[0032] The standard sections of the railing include:

[0033] Erect a pole;

[0034] There are at least two horizontal bars, one on each side of the upright;

[0035] And a lifting mechanism, which is built into the upright.

[0036] One end of the pole is provided with a bearing part, and the other end away from the bearing part is provided with a plug-in part, and the bearing part and the plug-in part are matched.

[0037] A method for controlling the lifting base of an adjustable ventilation enclosure includes:

[0038] Receive wind speed-direction data from an anemometer, determine whether the wind speed-direction data is within the locked wind speed range of the multi-order vortex-induced vibration, and obtain the preset height-angle parameters corresponding to the current vortex-induced vibration response.

[0039] Adjust the height and rotation angle of the lifting section according to the preset height-angle parameters so that the lifting section reaches the preset rotation angle and / or preset height.

[0040] The advantage of this invention is that it can change the aerodynamic shape and ventilation rate of the entire lifting base by controlling the height and rotation angle of the lifting section, so that the entire railing can suppress the generation of multi-stage large-amplitude vortex-induced vibrations under different locking wind speeds, and avoid resonance caused by the vortex shedding frequency being consistent with the frequency of the bridge structure in the locking wind speed range, which would affect the normal operation of the bridge. Attached Figure Description

[0041] Figure 1 An assembly drawing of an adjustable ventilation enclosure provided in an embodiment of this application;

[0042] Figure 2 This is a schematic diagram of the initial state of the enclosure assembly provided in an embodiment of this application;

[0043] Figure 3A schematic diagram of the enclosure assembly structure in the fully extended state of the telescopic part provided in an embodiment of this application;

[0044] Figure 4 A cross-sectional view of the pole provided in an embodiment of this application;

[0045] Figure 5 A structural schematic diagram of a standard section of a railing is provided for embodiments of this application;

[0046] Figure 6 This is a schematic diagram of the structure of the lifting base provided in the embodiments of this application;

[0047] Figure 7 This is a schematic diagram of the lifting joint provided in an embodiment of this application;

[0048] Figure 8 A schematic diagram of the top section provided in an embodiment of this application;

[0049] Figure 9 A structural schematic diagram of the apex section provided for this embodiment from another perspective;

[0050] Figure 10 A schematic diagram of the structure of an intermediate section provided in an embodiment of this application;

[0051] Figure 11 A schematic diagram of the basal segment provided in the embodiments of this application;

[0052] Figure 12 This is a schematic diagram of the direction control mechanism provided in an embodiment of this application.

[0053] 10. Railing; 11. Railing standard section; 111. Upright; 1111. Upper part; 1112. Lower part; 112. Receiving part; 113. Insertion part; 114. Horizontal bar; 115. Lifting mechanism; 20. Lifting base; 21. Lifting section; 211. Top section; 2111. Top section body; 2112. First hollow disc; 2113. First limiting groove; 2114. First locking lug; 2115. Cylindrical protrusion; 2116. Mounting part; 2117. Fixing bolt; 212. Intermediate section; 2121. Intermediate section body; 2122. Second Hollow disc; 2123, second limiting groove; 2124, second locking lug; 2125, second circular baffle; 2126, second circular hole; 213, base section; 2131, base section body; 2132, third hollow disc; 2133, third limiting groove; 2134, third circular baffle; 2135, third circular hole; 22, rotary drive unit; 221, drive motor; 222, base; 23, telescopic drive unit; 231, hydraulic cylinder; 232, disc; 233, positioning protrusion; 24, base body; 241, protective cover; 242, bottom shell. Detailed Implementation

[0054] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0055] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0056] To solve the above-mentioned technical problems, the present invention proposes a barrier with adjustable ventilation rate, which can be used as a barrier for bridge maintenance access or a barrier for driving lanes.

[0057] Please see Figure 1 and Figure 2 The adjustable ventilation enclosure in this embodiment comprises four parts: an anemometer (not shown in the figure), a control unit (not shown in the figure), railings 10, and a lifting base 20. For ease of description, the combination of a single lifting base 20 and its corresponding railing 10 is defined as the enclosure assembly; the orientation of the upper surface of the top section 211 is defined as upward, and the vertical direction is defined as the axial direction. See details... Figure 2 The coordinate system in the middle.

[0058] The adjustable ventilation rate of the enclosure proposed in this invention can change the aerodynamic shape and ventilation rate of the entire enclosure by adjusting the lifting and lowering of the railing 10 and the lifting section 21 in the lifting base 20, thereby enabling the entire enclosure to suppress or eliminate the generation of multi-order large amplitude vortex-induced vibration under different wind speed conditions, so as to avoid fatigue damage to the bridge structure.

[0059] The anemometer in this invention is used to detect wind speed and direction and transmit wind speed-direction data to the control unit. Anemometers can be installed at multiple locations on the bridge, such as the bridge deck, to collect more detailed data. The anemometer can be a PC-2FB type wind speed alarm or a similar product.

[0060] The control unit receives wind speed-direction data from an anemometer and pre-stores data on the corresponding attitudes of the enclosure under different wind speeds and directions, as well as data on the locked wind speed range of multi-order vortex-induced vibrations, specifically the height parameters of the railing 10 and the height-angle parameters of the lifting section 21 under the corresponding wind speed-direction conditions. After acquiring the wind speed-direction data, it determines whether the data falls within the locked wind speed range of the multi-order vortex-induced vibrations, acquires the preset height-angle parameters corresponding to the current vortex-induced vibration response, and obtains the height parameters of the railing 10 and the height and angle parameters of the lifting section 21 based on these preset parameters. Then, it sends commands to the rotation drive unit 22 and the telescopic drive unit 23 to adjust the railing and lifting section 21 to the predetermined attitudes according to these parameters. The control unit consists of a microcomputer that stores attitude data of the enclosure with adjustable ventilation rate under different wind speeds and directions. This data can be obtained through computer simulation calculations (e.g., using Fluent software) or through wind tunnel simulation experiments. The control unit can be installed individually in each fence assembly, or a single control unit can be used to control all fence assemblies.

[0061] Example 1

[0062] Please see Figures 2 to 5 In this embodiment, the railing 10 is composed of at least two railing standard sections 11, wherein each railing standard section includes a vertical post 111, at least two horizontal posts 114 and a lifting mechanism 115.

[0063] The upright post 111 is columnar, and has a plug-in part 113 and a receiving part 112 for connecting other standard railing sections 11 or lifting bases 20. The plug-in part 113 is located at one end of the upright post 111, and the receiving part 112 is located at the end of the upright post 111 opposite to the plug-in part 113. The plug-in part 113 is a columnar protrusion, and the receiving part 112 is a columnar groove, which mates with the plug-in part 113. In this embodiment, the plug-in part 113 is located at the lower end of the upright post 111, and the receiving part 112 is located at the upper end of the upright post 111. During installation, the plug-in part 113 is first inserted into the receiving part 112, and then fixed with bolts.

[0064] The upright 111 has a cavity for accommodating the lifting mechanism 115. The upright 111 is divided into two parts in the vertical direction, namely the upper part 1111 and the lower part 1112. The distance between the upper part 1111 and the lower part 1112 is controlled by controlling the lifting mechanism 115, thereby realizing the adjustment of the distance between the horizontal bars 114.

[0065] The crossbar 114 is columnar and can be connected to both sides of the upright 111 by threaded connection, welding, or other connection methods. In this embodiment, the crossbar 114 is cylindrical. Preferably, the crossbar 114 can also be cuboid in shape. This allows the ventilation rate of the entire railing to be changed not only by altering the spacing between the crossbars 114, but also by changing the angle of the crossbar 114 relative to the horizontal plane.

[0066] The lifting mechanism 115 is built into the upright 111. In this embodiment, the lifting mechanism 115 is composed of an electric push rod. Of course, components or assemblies that can drive vertical movement, such as pneumatic cylinders or linear motors, can also be used to replace the hydraulic cylinder. The lifting mechanism 115 changes the spacing of the horizontal bars 114 of the entire lifting railing 10 by controlling the extension and retraction of the upright 111, thereby changing the ventilation rate of the entire enclosure.

[0067] When making adjustments, it is first necessary to collect wind speed and wind direction data. The wind speed and wind direction data are obtained through an anemometer and transmitted to the control unit. The control unit then obtains the height parameters of the railing under the wind speed and wind direction conditions based on the above data and the data stored in the system, and transmits a signal to the lifting mechanism 115 to adjust the entire railing 10 to the predetermined height.

[0068] The ventilation rate of the entire enclosure can be adjusted by adjusting the spacing between the horizontal bars 114 to cope with different locked wind speed ranges, so that the entire adjustable ventilation rate enclosure can effectively suppress the generation of large amplitude of multi-order vortex-induced vibration or eliminate vortex-induced vibration in different locked wind speed ranges.

[0069] In addition, the crossbars 114 between adjacent enclosure assemblies can be connected together by a snap-fit ​​mechanism (not shown in the figure).

[0070] Example 2

[0071] Please see Figure 2 , Figure 6 as well as Figure 12 The lifting base 20 includes four parts: lifting section 21, rotation drive unit 22, telescopic drive unit 23, and base body 24.

[0072] The base body 24 includes two parts: a protective cover 241 and a bottom shell 242. During installation, the entire lifting base 20 can be directly embedded in the ground or exposed above the ground, but the protective cover 241 should not be completely exposed above the ground.

[0073] The protective cover 241 is tubular; in this embodiment, it is a square tubular shape, but other shapes are also possible. The protective cover 241 has an opening at the top and a baffle with a central opening at the bottom to support the lifting section 21. For ease of description, the lifting section 21 being fully retracted is defined as the initial state. When the entire lifting base 20 is retracted, the entire lifting section 21 is embedded within the protective cover 241. The lower surface of the lifting section 21 abuts against the baffle below the protective cover 241, and the upper surface of the lifting section 21 is flush with the upper edge of the protective cover 241, or it may be slightly higher. In the initial state, the lifting section 21 completely fills the upper opening of the protective cover 241. By placing the lifting section 21 inside the protective cover 241, direct contact between the lifting section 21 and the ground is avoided, preventing damage to the lifting section 21.

[0074] To facilitate the lifting and lowering of the lifting section 21, the lifting section 21 and the protective cover 241 are connected by a clearance fit. A silicone ring can be installed in the gap between the lifting section 21 and the protective cover 241 to improve waterproof performance; other waterproofing methods can also be used.

[0075] The bottom shell 242 is barrel-shaped, with its opening facing the lower surface of the baffle of the protective cover 241 and connected to the bottom of the protective cover 241. It can be connected by a detachable method such as snap-fit, threaded connection or bolt fixation, or it can be directly welded to the protective cover 241.

[0076] Please see Figure 12 The rotary drive unit 22 is disposed inside the base body 24 and fixed on the bottom shell 242 to drive the rotation of the lifting section 21. In this embodiment, the rotary drive unit 22 consists of a drive motor 221 and a base 222. The drive motor 221 is disposed at the bottom of the bottom shell 242, and the drive motor 221 and the base 222 are connected by a gear set. Of course, other transmission methods, other components or mechanisms that can output torque can be selected to replace the drive motor 221.

[0077] The telescopic drive unit 23 is mounted on the base and is used to control the extension and retraction of the lifting section 21. The telescopic drive unit 23 includes a hydraulic cylinder 231 and a disc 232. One end of the hydraulic cylinder 231 is fixed to the base 222, and the disc 232 is fixed at the end of the hydraulic cylinder 231 away from the base 222. At least one positioning protrusion 233 is provided around the disc 232. The telescopic drive unit 23 is connected to the lifting section 21 through the positioning protrusion 233. In this embodiment, four positioning protrusions 233 are provided, and all positioning protrusions 233 are arranged around the disc 232 at 90° intervals.

[0078] When it is necessary to control the lifting section 21 to rise, the disc 232 is connected to the lifting section 21, and the hydraulic cylinder 231 pushes the disc 232 to rise, thereby driving the entire lifting section 21 to rise. When it is necessary to control the lifting section 21 to fall, the hydraulic cylinder 231 slowly retracts, and due to the loss of support, the lifting section 21 will fall along with the disc 232 under the action of gravity. When it is necessary to control the direction of the lifting section 21, the drive motor 221 of the rotary drive unit 22 drives the base 222 to rotate, and the power is transmitted by the telescopic drive unit 23. Specifically, the positioning protrusion 233 on the disc 232 is used to drive the lifting section 21 to rotate.

[0079] Please see Figure 7 In this embodiment, the lifting section 21 consists of three parts: a top section 211, a middle section 212, and a base section 213. These three parts have similar shapes but different dimensions. When the telescopic part is in the retracted state, the top section 211 is fitted inside the middle section 212 and can rotate within it. The middle section 212 is fitted inside the base section 213 and can rotate within it. A ventilation device is provided on the side of the lifting section 21, and its principle for suppressing large-amplitude vortex-induced vibrations is as follows:

[0080] By changing the height of the lifting section 21, the aerodynamic shape of the entire lifting base 20 can be changed, suppressing the generation of vortices. In addition, the side of the lifting section 21 is also provided with a ventilation device, so that part of the air blowing towards the lifting base 20 will flow out from the lifting section 21 and will not be completely blocked by the entire lifting base 20, further suppressing the generation of large vortices, thereby avoiding or eliminating the generation of large amplitude vortex-induced vibration.

[0081] When it is necessary to adjust the lifting section 21, the control unit first determines whether the wind speed-direction data is within the locked wind speed range of the multi-stage vortex vibration based on the wind speed-direction data transmitted by the anemometer. Then, it obtains the height-angle parameters of the lifting section 21 based on the vortex vibration response data. Subsequently, it controls the rotation drive unit 22 and the telescopic drive unit 23 to adjust the lifting section 21 according to the preset height-angle parameters.

[0082] Please see Figure 8 and Figure 9In this embodiment, the top section 211 includes a top section body 2111, a first hollow disc 2112, and a mounting part 2116. The top section body 2111 is tubular, specifically square tubular, with its upper end sealed by a solid disc. In this embodiment, the top section body 2111 is generally square tubular. Ventilation devices are provided on all four axial sides of the top section body 2111, and ventilation holes are provided on all four sides. The size and density of the ventilation holes on the four sides are different, which makes the ventilation rate of the ventilation devices on the four sides different. In this way, the entire enclosure can reduce the vortex vibration amplitude by changing the aerodynamic shape of the entire lifting base 20 by controlling the lifting of the lifting section 21. Furthermore, after the lifting section 21 is extended, the ventilation rate of the windward side of the lifting section 21 can be changed to further reduce the vortex vibration amplitude or eliminate vortex vibration.

[0083] The bottom of the top section body 2111 is connected to a first hollow disc 2112. The inner ring of the first hollow disc 2112 is provided with a first limiting groove 2113 that matches the positioning protrusion and whose number and arrangement are corresponding to the positioning protrusion 233. The axial depth of the first limiting groove 2113 should be greater than or equal to the axial thickness of the positioning protrusion 233. The outer ring of the first hollow disc 2112 is provided with a first locking lug 2114 for connecting the intermediate section 212 and driving the intermediate section 212 to rise. When it is necessary to control the top section 211 to rise, the control unit first controls the rotary drive unit 22 to rotate, so that the positioning protrusion 233 aligns with the first limiting groove 2113. Then, the telescopic drive unit 23 is controlled to extend, so that the positioning protrusion matches the first limiting groove 2113, connecting the disc and the top section 211. Then, the rotary drive unit 22 is controlled to rotate again, and according to the wind speed-direction data transmitted from the anemometer, a suitable windward surface or a suitable windward angle is selected. Then, the telescopic drive unit 23 is controlled to extend, driving the top section 211 to rise, and transporting the top section 211 to the predetermined position according to the wind speed-direction data. When it is necessary to lower the top section 211, simply control the telescopic drive unit 23 to retract slowly, and the top section 211 will descend together with the telescopic drive unit 23 under the action of gravity. It should be noted that it is also possible to first control the top section 211 to rise or fall to the predetermined position, and then adjust the direction of the top section 211. The upper surface of the top section body 2111 is provided with a mounting portion 2116. In this embodiment, the mounting portion 2116 is a mounting groove that can mate with the insertion portion 113 on the upright 111. Of course, it is easy to imagine that the mounting portion 2116 can also be set as a protruding structure that can mate with the receiving portion 112 of the upright 111. A hollow cylindrical protrusion 2115 is provided on the upper surface of the top section body 2111. The bottom of the mounting portion 2116 has a hole that mates with the cylindrical protrusion 2115. During installation, the mounting portion 2116 is first inserted through the cylindrical protrusion 2115. The mounting part 2116 is installed on the top section 211, and then the mounting bolt 2117 is used to fix the mounting part 2116 to the top section 211. This ensures that after the entire fence is installed (i.e., after the crossbars 114 of different fence assemblies are connected), even if the top section 211 rotates, the railing will not rotate with the top section 211. It is worth noting that during assembly, appropriate lubrication measures should be taken between the mounting part 2116 and the cylindrical protrusion 2115, and between the nut of the fixing bolt 2117 and the mounting part 2116, to ensure smoother rotation between the mounting part 2116 and the top section 211. In this embodiment, the upright 111 and the mounting part 2116 are fixedly connected by bolts.

[0084] Furthermore, during the process of controlling the lifting section 21 to rise and fall, the positioning protrusion 233 is always in contact with the first limiting groove 2113.

[0085] Please see Figure 10In this embodiment, the shape and structure of the intermediate section 212 are similar to those of the top section 211. The intermediate section 212 includes an intermediate section body 2121, a second hollow disk 2122, and a second circular baffle 2125. Ventilation devices are provided on the four axial sides of the intermediate section body 2121, and ventilation holes are provided on the four sides. The size and density of the ventilation holes on the four sides are different, which makes the ventilation rate of the ventilation devices on the four sides of the intermediate section body 2121 different. Its principle of suppressing or eliminating large-amplitude vortex vibration is similar to that of the top section 211. The second hollow disc 2122 is disposed at the bottom of the intermediate section body 2121 to receive the top section 211. When the lifting section 21 is in the initial state, the lower surface of the top section 211 abuts against the second hollow disc 2122. The inner ring of the second hollow disc 2122 is provided with a second limiting groove 2123, which matches the positioning protrusion 233. The number and arrangement of the two are exactly the same. The outer ring of the second hollow disc 2122 is provided with a second locking lug 2124 to drive the base section 213 to move. The upper surface of the intermediate section 212 is provided with a second circular baffle 2125, which has a second circular hole 2126. The size of the second circular hole 2126 is the same as the size of the disc on the upper surface of the top section body 2111.

[0086] When adjustment of the intermediate section 212 is required, the control unit first determines whether the wind speed-direction data is within the locked wind speed range of the multi-stage vortex-induced vibration based on the wind speed-direction signal transmitted by the anemometer. The control unit has a built-in preset height-angle parameter corresponding to the vortex-induced vibration response, and obtains the height-angle parameter of the intermediate section 212 at this time. The control unit first controls the telescopic drive unit 23 to extend and connect the lifting section 21, so that the positioning protrusion 233 simultaneously mates with the first limiting groove 2113 and the second limiting groove 2123. Then, the control unit controls the rotation drive unit 22 to adjust the intermediate section 212 and the top section 211 to the position of the intermediate section 212. 2. At a predetermined angle, the telescopic drive unit 23 is driven to extend again, causing the positioning protrusion 233 to separate from the second limiting groove 2123. Finally, the top section 211 of the rotary drive unit 22 is adjusted to a predetermined angle, and the telescopic drive unit 23 is adjusted to a predetermined height. After the top section 211 is fully extended from the protective cover 241, the telescopic drive unit 23 pushes the top section 211 to continue to rise. The first locking lug 2114 will abut against the second circular baffle 2125 and drive the middle section 212 to rise until the middle section 212 rises to a predetermined height, thereby controlling the entire lifting section 21 to rise to a predetermined height.

[0087] Please see Figure 11In this embodiment, the base section 213 comprises three parts: the base section body 2131, the third hollow disk 2132, and the third circular baffle 2134. Ventilation devices are provided on all four axial sides of the base section body 2131, and ventilation holes are provided on each of the four sides. The size and density of the ventilation holes on the four sides are different, resulting in different ventilation rates for the ventilation devices on the four sides of the base section body 2131. The principle for suppressing or eliminating large-amplitude vortex-induced vibration is similar to that of the top section 211.

[0088] The base section body 2131 is provided with a third circular baffle 2134 at the top. The third circular baffle 2134 has a third circular hole 2135 of the same size as the second circular baffle 2125. The base section 213 is provided with a third hollow disk 2132 at the bottom. The inner ring of the third hollow disk 2132 is provided with a third limiting groove 2133 that matches the positioning protrusion 233 and whose number and arrangement are the same as the positioning protrusion 233. When the base section 213 also needs to extend the protective cover 241, taking the lifting section 21 in its initial state as an example, the control unit first determines whether the wind speed-direction data is within the locked wind speed range of the multi-order vortex-induced vibration based on the wind speed-direction data. Then, it obtains the height-angle data of the lifting section 21 based on the preset height-angle parameters corresponding to the vortex-induced vibration response. Next, the control unit controls the telescopic drive unit 23 to extend, causing the positioning protrusion 233 to abut against the first limiting groove 2113, the second limiting groove 2123, and the third limiting groove 2133. Subsequently, it controls the rotation drive unit 22 to rotate, causing the entire lifting section 21 to rotate to the predetermined angle of the base section 213. Then, it controls the telescopic drive unit 23 to continue extending, causing the positioning protrusion 233 to abut against the first limiting groove 2113, the second limiting groove 2123, and the third limiting groove 2133. Block 233 separates from the third limiting groove 2133, and the rotary drive unit 22 continues to rotate, rotating the top section 211 and the middle section 212 together to the predetermined angle of the middle section 212. Then, the telescopic drive unit 23 is extended again, so that the positioning protrusion 233 separates from the second limiting groove 2123, that is, the positioning protrusion 233 only matches the first limiting groove 2113. At this time, the rotary drive unit 22 is rotated for the last time, rotating the top section 211 to the predetermined position. Finally, the telescopic drive unit 23 is controlled to continue to rise, driving the entire lifting section 21 to the predetermined height. During this process, the second locking lug 2124 will abut against the third circular baffle 2134 and drive the base section 213 to rise.

[0089] To facilitate the rotation of the lifting section 21 controlled by the disc, the preferred ratio between the groove depths of the first limiting groove 2113, the second limiting groove 2123, and the third limiting groove 2133 and the thickness of the positioning protrusion 233 is 3:2:1:1.5. To achieve more precise adjustment, the range of wind speeds that the lifting base 20 can adapt to can also be increased by increasing the number of intermediate sections 212.

[0090] The advantages of this invention are that the adjustable ventilation rate of the enclosure proposed in this application can change the ventilation rate of the entire enclosure by adjusting the spacing of the crossbars 114, the height of the lifting base 20, or by simultaneously adjusting the crossbars 114 and the lifting base 20. By changing the ventilation rate, the generation or elimination of large-amplitude vortex-induced vibration can be suppressed. In addition to adjusting the height, the lifting base 20 can also adjust the direction of the lifting section 21, control the cross-sectional shape and ventilation rate of the windward side of the lifting base 20, thereby adjusting the aerodynamic shape and ventilation rate of the entire enclosure, further improving the adjustment accuracy and range of the ventilation rate of the entire enclosure, so that the enclosure can adapt to different vortex-induced vibration wind speed ranges. Based on the wind speed-direction data, it is determined whether the wind speed-direction data is within the locked wind speed range of vortex-induced vibration. Based on the preset height-angle parameters corresponding to the vortex-induced vibration response, the height of the railing and the height-angle of the lifting section 21 are adjusted in real time to suppress or eliminate the generation or elimination of large-amplitude vortex-induced vibration. Furthermore, compared to traditional methods of suppressing large-amplitude vortex-induced vibration by increasing weight or by adding aerodynamic measures such as deflectors, the solution provided by this invention only requires replacing the existing barriers, resulting in minimal changes to the bridge. The original maintenance access barriers and driving lane barriers on the bridge can be replaced with the barriers provided by this invention, thus minimizing the increase in bridge weight and preventing excessive weight gain from increasing the bridge's construction costs.

[0091] Based on the above-mentioned adjustable ventilation rate fence, the present invention also proposes a control method for the lifting base 20 of the above-mentioned adjustable ventilation rate fence, the control method comprising the following steps:

[0092] S100: Receive wind speed-direction data from the anemometer, determine whether the wind speed-direction data is within the locked wind speed range of the multi-order vortex vibration, and obtain the preset height-angle parameters corresponding to the current vortex vibration response.

[0093] S200. Adjust the height and rotation angle of the lifting section 21 according to the preset height-angle parameters so that the lifting section 21 reaches the preset rotation angle and / or preset height.

[0094] There are prerequisite steps before step S200:

[0095] S110, Control the lifting section 21 to return to its initial state.

[0096] Specifically, step S110 includes:

[0097] S111, Control the rotation drive unit 22 to rotate the top end section 211, so that the first limiting groove 2113 is aligned with the second limiting groove 2123;

[0098] S112, Control the telescopic drive unit 23 to retract, so that the positioning protrusion 233 simultaneously abuts against the first limiting groove 2113 and the second limiting groove 2123;

[0099] S113, control the rotation drive unit 22 to rotate the top section 211 and the middle section 212 to align the first limiting groove 2113, the second limiting groove 2123 and the third limiting groove 2133.

[0100] S114. Control the telescopic drive unit 23 to retract, so that the positioning protrusion 233 simultaneously abuts against the first limiting groove 2113, the second limiting groove 2123 and the third limiting groove 2133.

[0101] Step S200 specifically includes:

[0102] S210, control the extension drive unit 23 to extend, so that the positioning protrusion 233 abuts against the first limiting groove 2113, the second limiting groove 2123 and the third limiting groove 2133.

[0103] S220, Control the rotation drive unit 22 to rotate the lifting section 21 to the base section 213 at a preset angle;

[0104] S230, the telescopic drive unit 23 extends, causing the positioning protrusion 233 to separate from the third limiting groove 2133;

[0105] S240, Control the rotation drive unit 22 to rotate the top section 211 and the middle section 212 to a preset angle of the middle section 212;

[0106] S250, the telescopic drive unit 23 extends, causing the positioning protrusion 233 to separate from the second limiting groove 2123;

[0107] S260, Control the rotary drive unit 22 to rotate the top end section 211 to a preset angle of the top end section 211;

[0108] S270, the telescopic drive unit 23 extends to raise the lifting section 21 to a predetermined height.

Claims

1. A fence with adjustable ventilation rate for installation on bridges, characterized in that, include: railing; A lifting base is provided on the bridge, and the railing is provided on the lifting base; The adjustable ventilation enclosure also includes: an anemometer; The lifting base includes: a base body; the base body includes: a protective cover, the lifting section being connected to the protective cover; and a bottom shell, the bottom shell being detachably connected to the lower part of the protective cover; The lifting base further includes: a rotary drive unit connected to the base body; a telescopic drive unit connected to the rotary drive unit and rotated by the rotary drive unit; a lifting section connected to the telescopic drive unit and extended or retracted by the telescopic drive unit; the rotary drive unit includes: a base, the telescopic drive unit disposed on the base; and a drive motor disposed on the base body and rotatably connected to the base. The rotary drive unit is located inside the base body and is fixed to the bottom shell to drive the rotation of the lifting section; the telescopic drive unit is located on the base to control the extension and retraction of the lifting section. The telescopic drive unit includes a hydraulic cylinder and a disc. One end of the hydraulic cylinder is fixed to the base, and the disc is fixed at the end of the hydraulic cylinder away from the base. At least one positioning protrusion is provided around the disc. The telescopic drive unit is connected to the lifting section through the positioning protrusion. A lifting section, rotatably mounted on the base body, is used for vertical extension and retraction, and is equipped with a ventilation device. The lifting section includes: a top section, with the ventilation device located on each axial side of the top section, and the ventilation rates of the ventilation devices on each axial side of the top section are different; an intermediate section, with the top section fitted inside the intermediate section, and the ventilation device located on each axial side of the intermediate section, and the ventilation rates of the ventilation devices on each axial side of the intermediate section are different; and a base section, with the intermediate section fitted inside the base section, and the ventilation device located on each axial side of the base section, and the ventilation rates of the ventilation devices on each axial side of the base section are different. The lifting section is rotated and / or extended / retracted according to the wind speed detected by the anemometer, so that the lifting section reaches a preset angle and / or preset height, thereby changing the air permeability of the ventilation device.

2. The adjustable ventilation enclosure according to claim 1, characterized in that, The top section includes: a top section body, and a first locking lug connected to the top section body. The first locking lug is connected to the middle section and drives the middle section to move upward by the upward movement of the top section body. The top section body moves upward by the drive of the telescopic drive unit. The intermediate section includes: an intermediate section body, and a second locking lug connected to the intermediate section body. The second locking lug is connected to the base section and drives the base section to move upward by the upward movement of the intermediate section body.

3. The adjustable ventilation enclosure according to claim 2, characterized in that, The top section also includes: The mounting part is disposed on the upper surface of the top section body and is used to connect the railing.

4. The adjustable ventilation enclosure according to claim 1, characterized in that, The railing includes: At least two standard railing sections are fixedly connected to each other. The standard section of the railing includes: Erect a pole; At least two horizontal bars are provided on both sides of the upright; And a lifting mechanism, which is built into the upright.

5. The adjustable ventilation enclosure according to claim 4, characterized in that, One end of the pole is provided with a bearing portion, and the other end away from the bearing portion is provided with a plug portion, wherein the bearing portion and the plug portion are matched.

Images