CN213173311U - Bridge and bridge vibration suppression structure - Google Patents

Abstract

The utility model discloses a bridge and bridge press down structure of shaking, wherein the bridge presses down the structure and locates the pontic of bridge, including control system, with control system electric connection and locate the acceleration sensor of pontic, install in the actuating mechanism of the pontic bottom surface that corresponds the position with acceleration sensor and with the supporting lower protruding piece that sets up of actuating mechanism, actuating mechanism will be protruding piece down under control system control and prop up and relative pontic bottom surface protrusion, lower protruding piece can be withdrawed and paste and lean on the pontic bottom surface. The acceleration sensor on the bridge body senses that the position of the bridge body has upward abnormal acceleration, the control system controls the driving mechanism to support the lower convex part downwards, so that the lower convex part forms a lifting surface positioned on the bottom surface of the bridge body, the pressure below the bridge body is smaller than that above the bridge body, and the pressure difference naturally exerts a downward force on the bridge body to inhibit the upward acceleration of the corresponding position of the bridge body, so that the vibration of the bridge body is inhibited, and the safety of the bridge is ensured.

Description

Bridge and bridge vibration suppression structure

Technical Field

The utility model relates to a can restrain bridge vibration press down structure and have this bridge that presses down structure that shakes.

Background

A bridge is generally a structure that is erected on a terrain such as a bay, a valley, or the like, and allows vehicles, pedestrians, or the like to smoothly pass through the bridge, and can effectively shorten a distance between two places separated by the terrain, thereby greatly facilitating traffic. However, since the surroundings of these terrains are generally open, bridges are often faced with harsher natural conditions, where the stability of the bridge structure is most critical with crosswinds.

The tacoma bridge built in the tacoma straits of the united states in 1940 invested in as much as $ 640 million, the third largest suspension bridge in the world that was second only to the jinmen bridge and george washington bridge at that time. In 11 months and 7 days in the same year, the Takoma bridge collapses when encountering medium-grade wind, and the fact that the bridge deck is severely twisted at that time can be clearly seen from the retained video data becomes a world famous bridge wind damage accident.

Abnormal flutter occurs in the bridge body of the Humen bridge from 5 months, 5 pm to the evening in 2020 due to 6-7 grade strong wind lasting for two hours. Through analysis, the phenomenon of causing the tremble of the Tiger gate bridge is called vortex-induced vibration. The vortex-induced vibration is vibration caused by vortex which alternately falls off after streaming passes through the section of the solid-web bridge under the action of average wind. The resonance wavelength of the bridge when the vortex vibration phenomenon occurs is related to the natural frequency thereof and the propagation speed of the surface wave of the bridge deck.

If the vortex vibration is allowed to continuously occur, normal traffic is affected, and a great potential hazard is likely to be caused to the safety of the bridge structure. Therefore, it is necessary to provide a vibration suppressing structure for suppressing the vibration of the bridge, so as to improve the safety of the bridge.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can restrain structure that shakes of bridge vibration to improve bridge security.

Another object of the utility model is to provide a bridge with this structure of shaking is pressed down.

In order to realize the above object, the utility model provides a bridge structure that shakes locates the pontic of bridge, including control system, with control system electric connection locates the acceleration sensor of pontic, install in with acceleration sensor corresponds the position actuating mechanism of pontic bottom surface and with the supporting lower protruding piece that sets up of actuating mechanism, actuating mechanism is in under the control system control will protruding piece props up and is relative down pontic bottom surface protrusion, protruding piece can be withdrawed and paste down the pontic bottom surface.

When the bridge has the tendency of generating vortex vibration, the acceleration sensor on the bridge body senses that the position of the bridge body has upward abnormal acceleration, and the control system obtains a sensing signal and controls the driving mechanism to downwards support the lower convex part, so that the lower convex part forms a lifting surface positioned on the bottom surface of the bridge body. At this time, the flow velocity of the crosswind passing through the lifting surface is greater than the flow velocity passing through the top surface of the bridge body, so that the pressure below the bridge body is smaller than the pressure above the bridge body, and the pressure difference naturally exerts a downward force on the bridge body to inhibit the upward acceleration of the corresponding position of the bridge body. The observable vibration of the bridge deck can be generated after multiple accumulated energy, and the accumulated conditions can be destroyed through the bridge vibration suppression structure, so that the vibration can be prevented from being gradually increased. When the acceleration sensor feeds back no abnormal acceleration, the lower convex piece is folded to be attached to the bottom surface of the bridge body and does not generate negative lift force any more. To sum up, compared with the prior art, the utility model discloses a bridge presses down vibration structure can effectively restrain the vibration of bridge, ensures bridge construction safety.

Preferably, the lower convex part comprises a lifting part and two swinging parts positioned on two sides of the lifting part, the driving mechanism comprises a first driving component and a second driving component, wherein the first driving component enables the lifting part to lift, one end of the swinging part is hinged to the bridge body, the other end of the swinging part is adjacent to the end part of the lifting part, and the second driving component enables the swinging part to swing upwards to be close to the bottom surface of the bridge body. The lower convex part is composed of a lifting part and two swinging parts, so that the lifting part and the swinging parts can be controlled by the first driving component and the second driving component respectively. When the bridge body begins to shake abnormally, only the lifting piece is put down, the lifting piece only generates small negative lift force, when the bridge body has large acceleration, the two swinging pieces are quickly put down to form a complete lifting surface, and large negative lift force is generated to inhibit shaking accumulation.

Specifically, the swinging members are of a straight plate-shaped structure, the bottom surface of the lifting member is an arc-shaped surface or a plane, and when the two swinging members are obliquely and adjacently connected to the two ends of the lifting member relative to the horizontal plane, the lower convex member integrally presents an arc shape or a trapezoid shape protruding downwards. When the bottom surface of the lifting piece is an arc-shaped surface, the two swinging pieces are adjacent to the rear lower lifting piece and integrally present an arc shape, when the bottom surface of the lifting piece is a plane, the two swinging pieces are adjacent to the rear lower lifting piece and integrally present a trapezoid shape, and the two shapes can form a lifting surface on the bottom surface of the bridge body.

Specifically, first drive assembly includes two bracing pieces and two first cables, the upper end of bracing piece articulate in the pontic bottom surface and the lower extreme connect in with sliding in the piece that goes up and down, the one end of first cable connect in the first rolling up and unreeling device that sets up on the pontic, the other end of first cable connect in the bracing piece lower extreme. When the lower end of the supporting rod is pulled up by the first cable, the supporting rod slides on the lifting piece and drives the lifting piece to rise, and when the first cable is released, the supporting rod naturally swings downwards to enable the lifting piece to descend.

More specifically, the first driving assembly further comprises two second inhaul cables, the lower end of each supporting rod is connected with one of the first inhaul cable and one of the second inhaul cable, and the first inhaul cable and the second inhaul cable are respectively located on two sides of the supporting rod. Through connect first cable and second cable respectively in bracing piece both sides, the lower hem and the last pendulum of steerable bracing piece also can make the bracing piece more firm when propping up simultaneously.

More specifically, be equipped with the track groove on the lift piece, the lower extreme of bracing piece articulates there is a wheel seat, be equipped with a gyro wheel in the wheel seat, the wheel seat is spacing make in the track groove the bracing piece can be followed the track groove slides. The supporting rod slides in the track groove through the roller, and the wheel seat is hinged to the supporting rod, so that the supporting rod can swing relative to the wheel seat, and the purpose that the lifting piece can be driven to ascend or descend when the supporting rod swings upwards or downwards is achieved.

More specifically, the second driving assembly comprises an upper pulley and a lower pulley which are respectively arranged at the upper end and the lower end of the supporting rod, and a third inhaul cable which is connected among the upper pulley, the lower pulley and one end of the swinging piece, and the third inhaul cable is further connected with a second winding and unwinding device arranged on the bridge body. Through set up two pulleys on the bracing piece, can come the upper hem and the lower hem of control swinging piece through the third cable when the bracing piece is propped up.

Preferably, the acceleration sensor, the driving mechanism and the lower convex member form a vibration suppression mechanism, and the bridge vibration suppression structure comprises a plurality of vibration suppression mechanisms arranged at intervals along the length direction of the bridge body. The multiple groups of vibration suppression mechanisms are arranged, so that the vibration suppression can be simultaneously performed on multiple positions when the bridge body shakes.

Specifically, the distance between two adjacent vibration suppression mechanisms is one tenth of the resonance wavelength of the bridge body. The arrangement position of the vibration suppression mechanism is related to the resonance wavelength of the bridge body, so that the optimal vibration suppression effect can be realized.

The utility model also provides a bridge, be equipped with foretell bridge on its pontic and press down the structure that shakes.

The utility model discloses a bridge also can realize restraining the effect of bridge vibration owing to set up foretell structure of shaking that presses down.

Drawings

Fig. 1 is a schematic structural diagram of the bridge vibration suppression structure during the supporting process.

FIG. 2 is a schematic view of the bridge vibration suppressing structure when retracted.

FIG. 3 is a schematic view of the principle of negative lift of a vibration suppressing structure of a bridge.

Fig. 4 is a schematic view of the bridge after the lifting member is lowered in the vibration damping structure.

FIG. 5 is a schematic view of the oscillating member beginning to sway down in the bridge damping structure.

FIG. 6 is a schematic view of the connection structure of the track groove and the support rod on the lifting member in the vibration damping structure of the bridge.

FIG. 7 is a schematic view of the arrangement of the vibration suppressing structures of the bridge along the length direction of the bridge.

FIG. 8 is a schematic view of a second embodiment of a bridge vibration suppressing structure.

FIG. 9 is a schematic view of a third embodiment of a bridge vibration suppressing structure.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the utility model provides a bridge vibration suppression structure, which is arranged on a bridge body 1 of the bridge and used for realizing the up-and-down vibration of the bridge body 1 caused by the phenomena of vortex-induced vibration and the like under the influence of medium and large level crosswind, wherein the cross section of the bridge body 1 is shown in fig. 1. The bridge vibration suppression structure comprises a control system, an acceleration sensor 2, a driving mechanism 3 and a lower convex part 4. The acceleration sensor 2 is mounted on the bridge body 1 for sensing whether the corresponding position of the bridge body 1 has abnormal acceleration in the up-down direction (especially upward direction), and is electrically connected with the control system. The control system is used for receiving the signal of the acceleration sensor 2 and controlling the driving mechanism 3 correspondingly, and the control system is conventional technology and is not shown and described in detail. The position of the acceleration sensor 2 is shown for illustration only and is not limited, and the acceleration sensor 2 may be arranged at any position of the bridge body 1, including being mounted on the surface of the bridge body 1 or being embedded in the bridge body 1.

The driving mechanism 3 is installed on the bottom surface of the bridge body 1 and the position of the driving mechanism along the length direction of the bridge body 1 corresponds to the installation position of the acceleration sensor 2, and it can be understood that when the acceleration sensor 2 is installed at a certain position on the top surface of the bridge body 1, the driving mechanism 3 is installed on the bottom surface of the bridge body 1 corresponding to the position. The lower convex part 4 is also arranged on the bottom surface of the bridge body 1 and is connected with the driving mechanism 3, and the driving mechanism 3 can jack the lower convex part 4 to be convex relative to the bottom surface of the bridge body 1 under the driving of the control system. The convex lower convex part 4 is equivalent to an inverted wing on the bottom surface of the bridge body 1 and plays a role in generating negative lifting force. The driving mechanism 3 can also retract the lower convex part 4 to be abutted against the bottom surface of the bridge body 1 under the control of the control system.

As shown in fig. 3, when the bridge has a tendency of generating vortex vibration, the acceleration sensor 2 on the bridge body 1 senses that the position of the bridge body 1 has an upward abnormal acceleration, and the control system obtains a sensing signal and controls the driving mechanism 3 to support the downward protruding part 4, so that the downward protruding part 4 forms a lifting surface on the bottom surface of the bridge body 1. At this time, the flow velocity of the crosswind passing through the lifting surface is greater than the flow velocity passing through the top surface of the bridge body 1, so that the pressure below the bridge body 1 is smaller than the pressure above the bridge body, and the pressure difference naturally exerts a downward force on the bridge body 1 to suppress the upward acceleration of the corresponding position of the bridge body 1. The observable vibration of the bridge deck can be generated after multiple accumulated energy, and the accumulated conditions can be destroyed through the bridge vibration suppression structure, so that the vibration can be prevented from being gradually increased. To sum up, compared with the prior art, the utility model discloses a bridge presses down vibration structure can effectively restrain the vibration of bridge, ensures bridge construction safety.

In the embodiment, the "support" and "jack-up" for the bridge vibration suppression structure and the lower protruding member 4 are relative to the bottom surface of the bridge body 1, and the "support" and "jack-up" are actually lowered rather than raised for the absolute position of the lower protruding member 4 itself.

Referring to fig. 4 and 5, the lower protrusion 4 includes a lifting member 5 and two swinging members 6, and in the cross-sectional direction of the bridge 1, the lifting member 5 is located in the middle and the two swinging members 6 are located on two sides of the lifting member 5. The bottom surface of the lifting piece 5 can be an arc surface or a plane, the lifting piece can ascend or descend relative to the bottom surface of the bridge body 1, the swinging piece 6 is of a straight plate-shaped structure, one end, far away from the lifting piece 5, of the swinging piece 6 is hinged to the bottom surface of the bridge body 1, so that the swinging piece can swing upwards to be close to the bridge body 1 or swing downwards to be adjacent to the lifting piece 5, and the adjacent connection can be in contact connection or can be provided with a certain gap. When the lifting member 5 is lowered and the two swinging members 6 abut against the two ends of the lifting member 5, the whole lower convex member 4 forms a complete lifting surface. In this embodiment, the bottom surface of the lifting member 5 is arc-shaped, so the lower protruding member 4 is also arc-shaped. When the bottom surface of the lifting piece 5 is a plane, the two swinging pieces 6 are obliquely arranged relative to the horizontal direction after swinging downwards, so that the lower convex piece 4 is trapezoidal.

The lower protruding part 4 is divided into three parts, so that the middle lifting part 5 descends at a slow speed before an emergency state occurs, and the swinging parts 6 on the two sides can quickly swing downwards to be in place at a high speed when the vibration is sudden, so that a lifting surface is quickly formed to inhibit the vibration, and the bridge body 1 is prevented from being damaged due to untimely formation of the lifting surface.

The driving mechanism 3 includes a first driving component and a second driving component, wherein the first driving component enables the lifting member 5 to lift, and the second driving component enables the swinging member 6 to swing up or down.

Specifically, first drive assembly includes two bracing pieces 31 and two first cables 32, and two bracing pieces 31 arrange respectively in the both ends of lift 5 near the edge, and two first cables 32 cooperate with two bracing pieces 31 respectively. The upper end of the support rod 31 is hinged to the bottom surface of the bridge body 1, the lower end is slidably connected to the lifting member 5, one end of the first cable 32 is connected to a first winding and unwinding device (not shown) arranged on the bridge body 1, and the other end of the first cable 32 is connected to the lower end of the support rod 31. The first winding and unwinding device is used for winding or unwinding the first cable 32, and belongs to a conventional device and is not described in detail. In fig. 4, the two support rods 31 are in the down state, so that the lifting element 5 is in the down state, when the first winding and unwinding device winds the first cable 32, the support rods 31 gradually swing upwards, and the lifting element 5 connected with the support rods 31 rises along with the support rods 31 until the state of being attached to the bottom surface of the bridge body 1 shown in fig. 2 is reached. When the first takeup and retraction device pays out the first cable 32, the support rod 31 gradually swings down, and the lifting member 5 is lowered again to the state shown in fig. 4.

As shown in fig. 6, the lifting member 5 is provided with a track groove 51 extending along the transverse direction of the bridge body 1, the track groove 51 has a structure with a large opening inside, the lower end of the support rod 31 is hinged with a wheel seat 61, a roller 62 is arranged in the wheel seat 61, the wheel seat 61 is limited in the track groove 51, and the roller 62 can drive the wheel seat 61 and the support rod 31 to slide in the track groove 51. The structure arrangement enables the support rod 31 to slide on the lifting piece 5 when pulled by the first cable 32, and can swing relative to the lifting piece 5, thereby realizing the purpose of driving the lifting piece 5 to lift. Of course, the connecting structure between the supporting rod 31 and the lifting member 5 is not limited thereto, and any structure that can drive the lifting member 5 during the swinging process of the supporting rod 31 is within the scope covered by the concept of the present disclosure.

Referring back to fig. 4 and 5, the number of the second driving assemblies is two, and the two second driving assemblies respectively drive the two swinging members 6. The second driving assembly comprises an upper pulley 34 and a lower pulley 35 respectively arranged at the upper end and the lower end of the supporting rod 31, and a third cable 36 connected between the upper pulley 34, the lower pulley 35 and one end of the swinging piece 6, wherein the third cable 36 is further connected to a second winding and unwinding device (not shown) arranged on the bridge body 1. When the second reeling and unreeling device drives the third cable 36 to move towards one side of the upper pulley 34, the swinging piece 6 swings upwards, and when the second reeling and unreeling device drives the third cable 36 to move towards one side of the lower pulley 35, the swinging piece 6 swings downwards. The second reeling and unreeling device drives the third inhaul cable 36 at a higher speed, so that the swinging piece 6 can swing downwards or upwards quickly.

When the requirement of the swinging speed of the swinging member 6 is not considered, the second driving component can also be a driving mechanism which is arranged at the hinged position of the swinging member 6 and comprises a motor and a gear, and can also drive the swinging member 6 to swing.

The working process of the bridge vibration suppression structure in the scheme is as follows: under normal conditions, the lower convex part 4 is in a retracted state as shown in fig. 2, when the acceleration sensor 2 detects that the bridge body 1 starts to generate directional acceleration, the first coiling and uncoiling device releases the first cable 32 to enable the support rod 31 to gradually swing downwards, the lifting part 5 descends to a state shown in fig. 4, at the moment, transverse wind passes through the lifting part 5 from top to bottom, and a small lifting surface only brings small negative lifting force to the bridge body 1. When the acceleration sensor 2 detects that the bridge body 1 starts to shake abnormally, that is, the upward acceleration is large, the two swinging members 6 are pulled down quickly by the two second driving assemblies to form a complete lifting surface, and at the moment, as shown in fig. 3, a large negative lifting force is generated, so that the vibration of the bridge body 1 is effectively inhibited.

Referring to fig. 7, the utility model discloses it is corresponding still to provide a bridge, is equipped with foretell bridge on its pontic 1 and presses down the structure that shakes, and other structures of bridge outside the pontic 1 are omitted. Specifically, the acceleration sensor 2, the driving mechanism and the lower convex part 4 form a vibration suppression mechanism, and the bridge vibration suppression structure comprises a plurality of vibration suppression mechanisms which are arranged at intervals along the length direction of the bridge body 1. The multiple vibration suppression mechanisms are provided, and when the bridge body 1 shakes, shaking suppression can be simultaneously performed for multiple positions. Specifically, the distance d between two adjacent vibration suppressing mechanisms is one tenth of the resonance wavelength of the bridge body 1. The arrangement position of the vibration suppression mechanism is related to the resonance wavelength of the bridge body 1, so that the state of the vibration suppression mechanism can be adjusted in real time when the resonance wave is transmitted along the bridge body 1, and the optimal vibration suppression effect is realized.

As shown in fig. 8, in the second embodiment of the present invention, the first driving assembly further includes two second cables 38, a first cable 32 and a second cable 38 are connected to the lower end of each supporting rod 31, and the first cable 32 and the second cable 38 are respectively located at two sides of the supporting rod 31. By adding the second cable 38, the support rod 31 can be pulled to swing downwards by using the second cable 38, and after the support rod 31 swings downwards to the proper position, the position of the lifting piece 5 can be kept stable by pulling in the first cable 32 and the second cable 38. Furthermore, the number of the first pulling cables 32 and the second pulling cables 38 connected to each supporting rod 31 may be two, and the two first pulling cables 32 and the two second pulling cables 38 are respectively in a branched structure, so as to further stabilize the lifting member 5.

As shown in fig. 9, in the third embodiment of the present invention, the lower protrusion 7 is a whole, the driving mechanism 8 is composed of three connecting rods, and it forms a parallelogram structure with the bottom surface of the bridge body 1, when the driving mechanism 8 swings down, the lower protrusion 7 is jacked up, and when the driving mechanism 8 swings up, the lower protrusion 7 can be retracted. For the convenience of being supported and retracted, the lower protruding member 7 is preferably made of flexible material or elastic material, such as canvas, nylon cloth, or other material with excellent mechanical properties.

The above disclosure is only a preferred embodiment of the present invention, and the function is to facilitate the understanding and implementation of the present invention, which is not to be construed as limiting the scope of the present invention, and therefore, the present invention is not limited to the claims.

Claims (10)

1. The utility model provides a bridge structure that shakes is located the pontic of bridge which characterized in that: the bridge comprises a control system, an acceleration sensor, a driving mechanism and a lower convex piece, wherein the acceleration sensor is electrically connected with the control system and arranged on a bridge body, the driving mechanism is arranged at a position corresponding to the acceleration sensor, the bottom surface of the bridge body is provided with the driving mechanism, the lower convex piece is matched with the driving mechanism, the driving mechanism is used for supporting the lower convex piece under the control of the control system to protrude relative to the bottom surface of the bridge body, and the lower convex piece can be retracted to be attached to the bottom surface of the bridge body.

2. The bridge vibration suppressing structure of claim 1, wherein: the lower convex part comprises a lifting part and two swinging parts positioned on two sides of the lifting part, the driving mechanism comprises a first driving component and a second driving component, the first driving component enables the lifting part to lift, one end of the swinging part is hinged to the bridge body, the other end of the swinging part is adjacent to the end part of the lifting part, and the second driving component enables the swinging part to swing upwards to be attached to the bottom surface of the bridge body.

3. The bridge vibration suppressing structure of claim 2, wherein: the swinging pieces are of a straight plate-shaped structure, the bottom surface of the lifting piece is an arc-shaped surface or a plane, and when the two swinging pieces are obliquely adjacent to the two ends of the lifting piece relative to the horizontal plane, the lower convex piece integrally presents an arc shape or a trapezoid shape which is convex downwards.

4. The bridge vibration suppressing structure of claim 2, wherein: the first driving assembly comprises two supporting rods and two first inhaul cables, the upper ends of the supporting rods are hinged to the bottom surface of the bridge body, the lower ends of the supporting rods are connected to the lifting piece in a sliding mode, one ends of the first inhaul cables are connected to a first winding and unwinding device arranged on the bridge body, and the other ends of the first inhaul cables are connected to the lower ends of the supporting rods.

5. The bridge vibration suppressing structure of claim 4, wherein: the first driving assembly further comprises two second inhaul cables, the lower end of each supporting rod is connected with one of the first inhaul cable and the second inhaul cable, and the first inhaul cable and the second inhaul cable are located on two sides of the supporting rod respectively.

6. The bridge vibration suppressing structure of claim 4, wherein: the lifting piece is provided with a track groove, the lower end of the supporting rod is hinged with a wheel seat, a roller is arranged in the wheel seat, and the wheel seat is limited in the track groove to enable the supporting rod to slide along the track groove.

7. The bridge vibration suppressing structure of claim 4, wherein: the second driving assembly comprises an upper pulley, a lower pulley and a third inhaul cable, wherein the upper pulley and the lower pulley are respectively arranged at the upper end and the lower end of the supporting rod, the third inhaul cable is connected between the upper pulley and the lower pulley and one end of the swinging piece, and the third inhaul cable is further connected with a second winding and unwinding device arranged on the bridge body.

8. The bridge vibration suppressing structure of claim 1, wherein: the acceleration sensor, the driving mechanism and the lower convex piece form a vibration suppression mechanism, and the bridge vibration suppression structure comprises a plurality of vibration suppression mechanisms which are arranged at intervals along the length direction of the bridge body.

9. The bridge vibration suppressing structure of claim 8, wherein: the distance between two adjacent vibration suppression mechanisms is one tenth of the resonance wavelength of the bridge body.

10. A bridge, characterized in that: the bridge body is provided with a bridge vibration suppression structure according to any one of claims 1 to 9.

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