Novel tower beam damping device for large-span bridge

Abstract

The utility model relates to a novel tower beam damping device for a large-span bridge, and the device comprises a kinetic energy conversion mechanism which comprises a rack connected to the bottom of a main beam, and a step-up gear box which is fixed on a bridge tower cross beam and is in transmission connection with the rack, and the step-up gear box converts the linear motion of the rack into rotary motion; and the vibration reduction damping mechanism comprises a rotary motion damper and an inertia element which are connected with the output shaft of the step-up gear box, and the inertia element and the rotary motion damper are coaxially connected to the step-up gear box or connected to the step-up gear box in parallel. When the main beam is subjected to the dynamic load effect, large longitudinal displacement occurs, the beam bottom fixing rack axially moves along with movement of the main beam, a gear train in the step-up gear box is driven to rotate, an inertia element connected with the step-up gear box is driven to rapidly rotate, huge equivalent mass is provided, and energy consumption is enhanced; meanwhile, the step-up gear box can be connected with the rotary motion damper in parallel, large enough damping is provided for the whole device, and the purposes of energy consumption, vibration reduction and displacement reduction are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of vibration reduction control of bridge structures, and in particular to a novel tower-beam vibration reduction device for large-span bridges. Background Art

[0002] Large-span cable-supported bridges have the characteristics of large span, flexible structure, and low damping. They are sensitive to dynamic effects such as wind, earthquake, and vehicle loads, and are prone to large longitudinal displacement under the effects of wind, earthquake, and vehicle loads, which seriously affects the safety and normal operation of the bridge. In order to suppress the longitudinal vibration of large-span cable-supported bridges, longitudinal damping vibration reduction devices are usually added between the towers and beams.

[0003] Common longitudinal dampers include lead extrusion dampers, steel dampers, friction dampers, and viscous dampers, and viscous dampers are most widely used in long-span bridge structures. By setting the technical parameters of the viscous damper, the damper can meet the vibration reduction and energy dissipation requirements of the bridge under dynamic loads.

[0004] The results of theoretical research show that the addition of viscous dampers to bridge structures can only improve the structural damping ratio or vibration reduction performance to a limited extent. Furthermore, in actual engineering applications, due to limitations such as aesthetics and maintenance issues, the installation position of the longitudinal viscous damper is restricted, resulting in a reduction in the movement stroke of the viscous damper, which affects the vibration reduction effect. Summary of the invention

[0005] The embodiment of the present application provides a novel tower-beam vibration reduction device for a large-span bridge, so as to solve the problem in the related art that the movement stroke of the viscous damper is reduced, thus affecting the vibration reduction effect.

[0006] The embodiment of the present application provides a novel tower-beam vibration reduction device for a long-span bridge, comprising:

[0007] A kinetic energy conversion mechanism, the kinetic energy conversion mechanism comprising a rack connected to the bottom of the main beam, and a speed-increasing gearbox fixed to the bridge tower crossbeam and drivingly connected to the rack, the speed-increasing gearbox converts the linear motion of the rack into rotational motion;

[0008] The vibration reduction and damping mechanism comprises a rotational motion damper and an inertial element connected to the output shaft of the speed increasing gearbox. The inertial element is coaxially connected to the rotational motion damper or connected in parallel to the speed increasing gearbox.

[0009] In some embodiments: the speed increasing gearboxes are provided with two groups, the two groups of speed increasing gearboxes are symmetrically arranged along the axis of the rack, and the input shafts of the two groups of speed increasing gearboxes are connected with driven gears;

[0010] An input wheel set is meshedly connected between the rack and the driven gear, and the input wheel set includes a large gear meshedly connected to the rack, and small gears coaxially fixed on both sides of the large gear and meshedly connected to the driven gear.

[0011] In some embodiments: the rack is a helical rack, and the large gear is a helical gear that cooperates with the helical rack.

[0012] In some embodiments: the width of the rack is greater than the width of the gear.

[0013] In some embodiments: a center hole is opened on the input wheel set, a support shaft is coaxially rotatably connected in the center hole, and both ends of the support shaft are fixedly connected to brackets that fix the input wheel set on the bridge tower beam.

[0014] In some embodiments: the axis of the rack is parallel to the length direction of the main beam, and the rack is connected to the bottom of the main beam by welding or fasteners;

[0015] A support for fixing the speed-increasing gearbox is provided on the top of the bridge tower crossbeam, and the speed-increasing gearbox is fixedly connected to the support via fasteners.

[0016] In some embodiments: the rotational motion damper is an eddy current rotational motion damper, the eddy current rotational motion damper comprises a stator and a rotor, one end of the rotor is connected to the output shaft of the speed increasing gearbox;

[0017] The inertial element is fixedly connected to the output shaft of the rotor, and the inertial element is a disc-shaped flywheel.

[0018] In some embodiments: a dustproof shell is also included, the speed increasing gearbox and the vibration damping mechanism are both located in the dustproof shell, a long strip avoidance groove is opened on the top of the dustproof shell, and the long strip avoidance groove is located directly below the rack.

[0019] In some embodiments: the speed increasing gearbox and the vibration reduction and damping mechanism are provided in multiple groups, and the multiple groups of the speed increasing gearbox and the vibration reduction and damping mechanism are sequentially spaced apart along the length direction of the rack.

[0020] The beneficial effects of the technical solution provided by this application include:

[0021] An embodiment of the present application provides a new type of tower-beam vibration reduction device for a large-span bridge. Since the new type of tower-beam vibration reduction device for a large-span bridge of the present application is provided with a kinetic energy conversion mechanism, the kinetic energy conversion mechanism includes a rack connected to the bottom of the main beam, and a speed-increasing gearbox fixed on the bridge tower crossbeam and connected to the rack for transmission, the speed-increasing gearbox converts the linear motion of the rack into rotational motion; a vibration reduction and damping mechanism, the vibration reduction and damping mechanism includes a rotational motion damper connected to the output shaft of the speed-increasing gearbox and an inertia element, the inertia element and the rotational motion damper are coaxially connected or connected in parallel to the speed-increasing gearbox.

[0022] Therefore, the new tower-beam vibration reduction device for large-span bridges of the present application adopts a mid-bearing gear rack structure design, which greatly reduces the length of the damper and increases the effective stroke of the damper exponentially. At the same time, inertial elements and vibration reduction damping mechanisms can be added on both sides of the rack, and the vibration reduction efficiency is significantly increased. When the main beam is subjected to dynamic loads, a large longitudinal displacement occurs, and the fixed rack at the bottom of the beam moves axially with the movement of the main beam, driving the gear system in the speed-increasing gearbox to rotate, and the inertial element connected to the speed-increasing gearbox rotates rapidly, providing a huge equivalent mass and enhancing energy consumption; at the same time, the speed-increasing gearbox can be connected in parallel to the rotational motion damper to provide sufficiently large damping for the entire device, achieving the purpose of energy consumption and vibration reduction and displacement reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic structural diagram of an embodiment of the present application from a longitudinal bridge perspective;

[0025] Figure 2 This is a schematic diagram of the structure of an embodiment of the present application from a transverse bridge perspective;

[0026] Figure 3 This is a schematic diagram of the connection between the speed increasing gearbox and the vibration damping mechanism in an embodiment of the present application.

[0027] Reference numerals:

[0028] 1. Bridge tower crossbeam; 2. Main beam; 3. Support; 4. Dustproof casing; 10. Kinetic energy conversion mechanism; 11. Rack; 12. Speed ​​increasing gearbox; 13. Input wheel set; 14. Large gear; 15. Small gear; 16. Driven gear; 17. Fastener; 18. Bracket; 20. Vibration reduction and damping mechanism; 21. Rotational motion damper; 22. Inertial element. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] The embodiment of the present application provides a novel tower-beam vibration reduction device for a large-span bridge, which can solve the problem in the related art that the movement stroke of the viscous damper is reduced, thereby affecting the vibration reduction effect.

[0031] See also Figures 1 to 3 As shown, the embodiment of the present application provides a novel tower beam vibration reduction device for a long-span bridge, comprising:

[0032] The kinetic energy conversion mechanism 10 includes a rack 11 connected to the bottom of the main beam 2, and a speed-increasing gearbox 12 fixed on the bridge tower crossbeam 1 and transmission-connected to the rack 11. The speed-increasing gearbox 12 converts the linear motion of the rack 11 in the transverse or longitudinal direction of the main beam 2 into rotational motion. The speed-increasing gearbox 12 amplifies the rotation speed of the input shaft through a gear system.

[0033] The vibration reduction and damping mechanism 20 includes a rotational motion damper 21 and an inertial element 22 connected to the output shaft of the speed increasing gearbox 12. The inertial element 22 is coaxially connected to the rotational motion damper 21 or connected in parallel to the speed increasing gearbox 12. When the speed increasing gearbox 12 drives the rotational motion damper 21 and the inertial element 22 to rotate, the rotational motion damper and the inertial element 22 generate a damping force to reduce the longitudinal vibration of the main beam 2 under the action of the dynamic load.

[0034] The new tower-beam vibration reduction device for large-span bridges in the embodiment of the present application adopts a mid-bearing gear rack structure design, which greatly reduces the length of the damper and increases the effective stroke of the damper exponentially. At the same time, inertial elements 22 and vibration reduction damping mechanisms can be added on both sides of the rack 11, and the vibration reduction efficiency is significantly increased.

[0035] When the main beam 2 is subjected to dynamic load, a large longitudinal displacement occurs, and the rack 11 fixed at the bottom of the beam moves axially with the movement of the main beam 2, driving the gear system in the speed-increasing gearbox 12 to rotate, and the inertial element 22 connected to the speed-increasing gearbox 12 rotates rapidly, providing a huge equivalent mass and enhancing energy consumption; at the same time, the speed-increasing gearbox 12 can be connected in parallel to the rotational motion damper 21 to provide sufficiently large damping for the entire device, thereby achieving the purpose of energy consumption, vibration reduction, and displacement reduction.

[0036] The principle of the rotational motion damper 21 is that when the conductor mass cuts the magnetic flux lines during movement, an induced electromotive force is generated in the conductor according to the Faraday electromagnetic induction principle, forming eddy currents, which convert the vibration energy into heat of the conductor, thereby achieving vibration control. The advantages of the rotational motion damper 21 are: there is no direct contact between the magnet and the conductor, no friction damping and wear; it is not affected by the environment such as temperature; there is no oil leakage, etc., it is easy to maintain and has good durability.

[0037] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides a new tower-beam vibration reduction device for a large-span bridge. The new tower-beam vibration reduction device for a large-span bridge has two groups of speed-increasing gearboxes 12. The two groups of speed-increasing gearboxes 12 are symmetrically arranged along the axis of the rack 11, and the input shafts of the two groups of speed-increasing gearboxes 12 are connected with driven gears 16.

[0038] An input wheel set 13 is meshedly connected between the rack 11 and the driven gear 16, and the input wheel set 13 includes a large gear 14 meshedly connected to the rack 11, and a small gear 15 coaxially fixed on both sides of the large gear 14 and meshedly connected to the driven gear 16. The rack 11 is preferably, but not limited to, a helical rack, and the large gear 14 is a helical gear matched with the helical rack. The width of the rack 11 is greater than the width of the large gear 14.

[0039] In some alternative embodiments: See Figures 1 to 3 As shown, an embodiment of the present application provides a new tower-beam vibration reduction device for a large-span bridge, wherein a center hole is provided on the input wheel group 13 of the new tower-beam vibration reduction device for a large-span bridge, a support shaft is coaxially rotatably connected in the center hole, and both ends of the support shaft are fixedly connected with brackets 18 which fix the input wheel group 13 on the bridge tower crossbeam 1.

[0040] The axis of the rack 11 is parallel to the length direction of the main beam 2, and the rack 11 is connected to the bottom of the main beam 2 by welding or fasteners 17; the top of the bridge tower crossbeam 1 is provided with a support 3 for fixing the speed-increasing gearbox 12, and the speed-increasing gearbox 12 is fixedly connected to the support 3 by fasteners 17, so that the device can provide motion damping when the main beam 2 is displaced along the longitudinal direction of the bridge.

[0041] In some alternative embodiments: See Figures 1 to 3 As shown, an embodiment of the present application provides a novel tower-beam vibration reduction device for a large-span bridge. The rotational motion damper 21 of the novel tower-beam vibration reduction device for a large-span bridge is preferably, but not limited to, an eddy current rotational motion damper. The eddy current rotational motion damper includes a stator and a rotor. One end of the rotor is connected to the output shaft of the speed-increasing gearbox 12. An inertial element 22 is fixedly connected to the output shaft of the rotor. The inertial element 22 is a disc-shaped flywheel. The inertial element 22 generates a huge equivalent mass when performing circular motion.

[0042] Rotational motion damper 21 Those skilled in the art may also select viscous rotational motion damper, magnetorheological rotational motion damper, friction rotational motion damper. When a long-span bridge vibrates, the vibration frequency is high and the speed is fast, and the speed-related damper quickly reduces vibration with good effect; when the vibration speed is slow and the displacement is very small, the speed-related damper cannot play a big role, and the friction rotational motion damper is very suitable for vibration reduction in this case.

[0043] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides a novel tower-beam vibration reduction device for a large-span bridge, which also includes a dustproof shell 4, a speed increasing gearbox 12 and a vibration reduction and damping mechanism 20 are both located in the dustproof shell 4, and a long avoidance groove is opened on the top of the dustproof shell 4, and the long avoidance groove is located directly below the rack 11 for partially exposing the input wheel group 13.

[0044] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides a new tower-beam vibration reduction device for a large-span bridge, wherein the speed increasing gearbox 12 and the vibration reduction and damping mechanism 20 of the new tower-beam vibration reduction device for a large-span bridge are provided with multiple groups, and the multiple groups of speed increasing gearboxes 12 and the vibration reduction and damping mechanism 20 are arranged in sequence and spaced apart along the length direction of the rack 11 to increase the vibration reduction and damping force of the main beam 2.

[0045] How it works

[0046] The embodiment of the present application provides a new tower-beam vibration reduction device for a large-span bridge. Since the new tower-beam vibration reduction device for a large-span bridge of the present application is provided with a kinetic energy conversion mechanism 10, the kinetic energy conversion mechanism 10 includes a rack 11 for connecting to the bottom of the main beam 2, and a speed-increasing gearbox 12 for fixing on the bridge tower crossbeam 1 and transmission connected to the rack 11, the speed-increasing gearbox 12 converts the linear motion of the rack 11 into rotational motion; a vibration reduction and damping mechanism 20, the vibration reduction and damping mechanism 20 includes a rotational motion damper 21 connected to the output shaft of the speed-increasing gearbox 12 and an inertial element 22, the inertial element 22 is coaxially connected to the rotational motion damper 21 or connected in parallel to the speed-increasing gearbox 12.

[0047] Therefore, the new tower-beam vibration reduction device for large-span bridges of the present application adopts a mid-bearing gear rack structure design, which greatly reduces the length of the damper and increases the effective stroke of the damper exponentially. At the same time, inertial elements 22 and vibration reduction damping mechanisms can be added on both sides of the rack 11, and the vibration reduction efficiency is significantly increased. When the main beam 2 is subjected to a dynamic load, a large longitudinal displacement occurs, and the fixed rack 11 at the bottom of the beam moves axially with the movement of the main beam 2, driving the gear system in the speed-increasing gearbox 12 to rotate, and the inertial element 22 connected to the speed-increasing gearbox 12 rotates rapidly, providing a huge equivalent mass and enhancing energy consumption; at the same time, the speed-increasing gearbox 12 can be connected in parallel to the rotational motion damper 21 to provide a sufficiently large damping for the entire device, achieving the purpose of energy consumption and vibration reduction and displacement reduction.

[0048] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0049] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A new tower-beam vibration reduction device for a long-span bridge, characterized in that: include: A kinetic energy conversion mechanism (10), the kinetic energy conversion mechanism (10) comprising a rack (11) connected to the bottom of a main beam (2), and a speed-increasing gearbox (12) fixed to a bridge tower crossbeam (1) and drivingly connected to the rack (11), the speed-increasing gearbox (12) converting the linear motion of the rack (11) into rotational motion; A vibration damping mechanism (20) comprising a rotational motion damper (21) connected to the output shaft of the speed increasing gearbox (12) and an inertial element (22), wherein the inertial element (22) is coaxially connected to the rotational motion damper (21) or connected in parallel to the speed increasing gearbox (12).

2. A novel tower-beam vibration reduction device for a long-span bridge as claimed in claim 1, characterized in that: The speed increasing gearbox (12) is provided with two groups, the two groups of speed increasing gearbox (12) are symmetrically arranged along the axis of the rack (11), and the input shafts of the two groups of speed increasing gearbox (12) are connected with driven gears (16); An input gear set (13) is meshedly connected between the rack (11) and the driven gear (16), and the input gear set (13) comprises a large gear (14) meshedly connected to the rack (11), and a small gear (15) coaxially fixed on both sides of the large gear (14) and meshedly connected to the driven gear (16).

3. A novel tower-beam vibration reduction device for a long-span bridge as claimed in claim 2, characterized in that: The rack (11) is a helical rack, and the large gear (14) is a helical gear matched with the helical rack.

4. A novel tower-beam vibration reduction device for a long-span bridge as claimed in claim 2, characterized in that: The width of the rack (11) is greater than the width of the large gear (14).

5. A novel tower-beam vibration reduction device for a long-span bridge as claimed in claim 2, characterized in that: The input wheel set (13) is provided with a central hole, a support shaft is coaxially rotatably connected in the central hole, and brackets (18) are fixedly connected at both ends of the support shaft for fixing the input wheel set (13) on a bridge tower crossbeam (1).

6. A novel tower-beam vibration reduction device for a long-span bridge as claimed in claim 1, characterized in that: The axis of the rack (11) is parallel to the length direction of the main beam (2), and the rack (11) is connected to the bottom of the main beam (2) by welding or fasteners (17); A support (3) for fixing the speed-increasing gearbox (12) is provided on the top of the bridge tower crossbeam (1), and the speed-increasing gearbox (12) is fixedly connected to the support (3) via a fastener (17).

7. A novel tower-beam vibration reduction device for a long-span bridge as claimed in claim 6, characterized in that: The rotational motion damper (21) is an eddy current rotational motion damper, comprising a stator and a rotor, one end of the rotor being connected to the output shaft of the speed increasing gearbox (12); The inertial element (22) is fixedly connected to the output shaft of the rotor, and the inertial element (22) is a disc-shaped flywheel.

8. The novel tower-beam vibration reduction device for a long-span bridge according to claim 1, characterized in that: It also includes a dustproof housing (4), the speed increasing gearbox (12) and the vibration reduction and damping mechanism (20) are both located in the dustproof housing (4), and a long strip avoidance groove is provided on the top of the dustproof housing (4), and the long strip avoidance groove is located directly below the rack (11).

9. The novel tower-beam vibration reduction device for a long-span bridge according to claim 1, characterized in that: The speed increasing gearbox (12) and the vibration reduction and damping mechanism (20) are provided in multiple groups, and the multiple groups of the speed increasing gearbox (12) and the vibration reduction and damping mechanism (20) are sequentially arranged at intervals along the length direction of the rack (11).

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