阅读说明：本技术 桥墩减震装置 (Pier damping device ) 是由 李元东 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种桥墩减震装置,包括基座、竖向减振机构、横向减振机构和顶板；所述竖向减振机构包括支撑座,设置于所述支撑座与基座之间的螺旋弹簧,设置于所述基座内、用于对所述支撑座沿竖直方向的振动施加阻尼作用的磁流变液阻尼器；所述横向减振机构包括位于所述顶板与支撑座之间的椭球状弹性滚子和用于对所述椭球状弹性滚子的转动施加阻尼作用的磁流变液旋转阻尼器；所述顶板的底部和支撑座的顶面形成有与所述椭球状弹性滚子配合的椭球面；本装置利用磁流变液阻尼器在冲击载荷下可以“智能”地调节自身刚度来改变结构的固有频率来抵抗冲击力和大变形,在桥梁受到冲击及振动的紧急时刻,能进一步通过调节磁流变液阻尼器的阻尼比去缓减冲击振动能量的传递并抑制墩-梁移位。(The invention discloses a pier damping device, which comprises a base, a vertical damping mechanism, a transverse damping mechanism and a top plate, wherein the base is provided with a vertical damping mechanism; the vertical vibration reduction mechanism comprises a supporting seat, a spiral spring arranged between the supporting seat and a base, and a magnetorheological fluid damper arranged in the base and used for damping the vibration of the supporting seat along the vertical direction; the transverse vibration reduction mechanism comprises an ellipsoidal elastic roller positioned between the top plate and the supporting seat and a magnetorheological fluid rotary damper for applying a damping effect on the rotation of the ellipsoidal elastic roller; ellipsoidal surfaces matched with the ellipsoidal elastic rollers are formed at the bottom of the top plate and the top surface of the supporting seat; the device utilizes the magnetorheological fluid damper to intelligently adjust the self rigidity under the impact load to change the natural frequency of the structure to resist the impact force and large deformation, and can further reduce the transmission of impact vibration energy and inhibit pier-beam displacement by adjusting the damping ratio of the magnetorheological fluid damper at the emergency moment when the bridge is impacted and vibrated.)

1. The utility model provides a pier damping device which characterized in that: the vibration damping device comprises a base, a vertical vibration damping mechanism, a transverse vibration damping mechanism and a top plate;

the vertical vibration reduction mechanism comprises a supporting seat, a spiral spring arranged between the supporting seat and a base, and a magnetorheological fluid damper arranged in the base and used for damping the vibration of the supporting seat along the vertical direction;

the transverse vibration reduction mechanism comprises an ellipsoidal elastic roller positioned between the top plate and the supporting seat and a magnetorheological fluid rotary damper for applying a damping effect on the rotation of the ellipsoidal elastic roller; and ellipsoidal surfaces matched with the ellipsoidal elastic rollers are formed at the bottom of the top plate and the top surface of the supporting seat.

2. The pier damping device according to claim 1, wherein: the magnetorheological fluid damper comprises a piston cylinder filled with magnetorheological fluid, a piston rod axially extending into the piston cylinder, a piston fixed on the piston rod and an electromagnetic coil wound outside the piston cylinder; and the piston is provided with a damping hole for the magnetorheological fluid to pass through.

3. The pier damping device according to claim 2, wherein: the magnetorheological fluid rotary damper comprises a shell, a rotatable damping plate, a connecting rod and an electromagnetic coil, wherein the shell is fixed with the supporting seat and filled with magnetorheological fluid, the damping plate is positioned in the shell and can rotate, the connecting rod is coaxially connected between the damping plate and the ellipsoidal elastic roller, and the electromagnetic coil is wound outside the shell.

4. The pier damping device according to claim 3, wherein: the supporting seat comprises a supporting plate and a supporting column integrally connected to the bottom of the supporting plate; the top of the piston cylinder is integrally provided with an installation sleeve in sliding fit with the support column; a plurality of diaphragm springs are arranged in the mounting sleeve in a stacked mode.

5. The pier damping device according to claim 4, wherein: honeycomb materials are filled between the piston cylinder and the inner wall of the base; the honeycomb material is filled with an energy-absorbing material.

6. The pier damping device according to claim 5, wherein: and when the supporting seat is in a natural state, the stacking height of the diaphragm spring is smaller than the vertical size of the installation space where the diaphragm spring is located.

Technical Field

The invention relates to the field of bridges, in particular to a pier damping device.

Background

When the bridge is threatened by large load action such as earthquake, explosion, vehicle overload and impact, collision of a ship with a pier and the like, large impact destructive force and displacement are often generated at the pier-beam combination part, so that the pier-beam structure is damaged if the pier-beam structure is light, and collapse is caused if the pier-beam structure is heavy, thereby bringing harm to the life and property of people and the economic development of the nation. At present, the dynamic response of a pier-beam structure under a large impact load is reduced, and the buffering and vibration isolation capability of the pier-beam structure is improved, so that the pier-beam structure becomes a key problem to be solved urgently in the field of bridge structure impact protection engineering.

In order to improve the shock insulation and damping capacity of the bridge pier, a passive support (such as a steel support, a rubber support, a special anti-seismic support and the like) is usually arranged between a beam and a pier (platform) of the bridge, has higher vertical rigidity and lower horizontal elasticity (rigidity), and can reduce the destructive force of impact vibration on the upper structure of the bridge to a certain extent by prolonging the vibration period of the structure. Although the traditional passive support has good vibration isolation and reduction performance under the action of general vibration load, the traditional passive support cannot intelligently adjust the self rigidity and improve the vertical strength to resist impact force and large deformation under the impact of large load, and cannot generate larger damping/deformation to dissipate instantaneous large energy, so that destructive displacement can be generated under the action of large horizontal shearing force, the traditional passive support lacks good compatibility of impact resistance and vibration isolation, becomes the weakest link in a bridge structure safety system, often causes earthquake damage such as pier-beam displacement and beam falling, and brings great hidden danger to the impact protection of a pier-beam structure.

In order to solve the problem, a pier damping device is needed, the device utilizes the fact that the magnetorheological fluid damper can intelligently adjust the rigidity of the magnetorheological fluid damper under impact load to change the natural frequency of a structure to resist impact force and large deformation, and can further reduce the transmission of impact vibration force (energy) and inhibit pier-beam displacement by adjusting the damping ratio of the magnetorheological fluid damper at the emergency moment when a bridge is impacted and vibrated.

Disclosure of Invention

In view of the above, the invention provides a pier damping device, which is simple in structure, meets the damping requirement of a bridge, and improves the horizontal rigidity of the bridge.

The pier damping device comprises a base, a vertical damping mechanism, a transverse damping mechanism and a top plate;

the vertical vibration reduction mechanism comprises a supporting seat, a spiral spring arranged between the supporting seat and a base, and a magnetorheological fluid damper arranged in the base and used for damping the vibration of the supporting seat along the vertical direction;

the transverse vibration reduction mechanism comprises an ellipsoidal elastic roller positioned between the top plate and the supporting seat and a magnetorheological fluid rotary damper for applying a damping effect on the rotation of the ellipsoidal elastic roller; and ellipsoidal surfaces matched with the ellipsoidal elastic rollers are formed at the bottom of the top plate and the top surface of the supporting seat.

Furthermore, the magnetorheological fluid damper comprises a piston cylinder filled with magnetorheological fluid, a piston rod extending into the piston cylinder along the axial direction, a piston fixed on the piston rod and an electromagnetic coil wound outside the piston cylinder; and the piston is provided with a damping hole for the magnetorheological fluid to pass through.

Further, the magnetorheological fluid rotary damper comprises a shell, a rotatable damping plate, a connecting rod and an electromagnetic coil, wherein the shell is fixed with the supporting seat and filled with magnetorheological fluid, the damping plate is arranged in the shell and can rotate, the connecting rod is coaxially connected between the damping plate and the ellipsoidal elastic roller, and the electromagnetic coil is wound outside the shell.

Further, the supporting seat comprises a supporting plate and a supporting column integrally connected to the bottom of the supporting plate; the top of the piston cylinder is integrally provided with an installation sleeve in sliding fit with the support column; a plurality of diaphragm springs are arranged in the mounting sleeve in a stacked mode.

Further, a honeycomb material is filled between the piston cylinder and the inner wall of the base; the honeycomb material is filled with an energy-absorbing material.

Further, under the natural state of the supporting seat, the stacking height of the diaphragm spring is smaller than the vertical size of the installation space where the diaphragm spring is located.

The invention has the beneficial effects that: according to the pier damping device, when the main beam or the pier vibrates in the vertical direction, the supporting seat and the base move relatively in the vertical direction, and the impact between the supporting seat and the base is reduced by the aid of the spiral spring between the supporting seat and the base; in the process, the piston of the magnetorheological fluid damper slides in the piston cylinder in a reciprocating manner along the axial direction, and the magnetorheological fluid in the piston cylinder repeatedly flows through the damping hole on the piston, so that the damping of the vibration energy is realized; on the other hand, an ellipsoidal elastic roller is arranged between the top plate and the supporting seat, and when the beam body or the pier horizontally vibrates, the roller can rotate to and fro to a certain degree, so that the vibration between the main beam and the bridge section is isolated; when the ellipsoidal roller rotates, the damping effect exerted by the magnetorheological fluid rotary damper is exerted, and the reduction of the vibration energy is realized. In the embodiment, the viscosity of the magnetorheological fluid in the damper can be controlled by controlling the current in the magnetorheological fluid damper or the magnetorheological fluid rotary damper, and finally the adaptive adjustment of the damping action of the damper is realized. The bridge pier and the main beam can be provided with sensors for detecting the vibration amplitude of the bridge pier and the main beam, the vibration amplitude of the bridge pier or the main beam is collected through the sensors, and the electrified current of the magnetorheological fluid damper or the magnetorheological fluid rotary damper is controlled, so that the main beam or the bridge pier can intelligently adjust the self rigidity under the impact load to change the inherent frequency (vibration period) of the structure, and the impact force and large deformation are resisted.

Drawings

The invention is further described below with reference to the figures and examples.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the magnetorheological fluid rotary damper of the present invention

1-magnetorheological fluid rotary damper 2-top plate 3-ellipsoidal elastic roller 4-supporting seat 5-spiral spring 6-diaphragm spring 7-honeycomb material 8-base 9-piston cylinder 10-guide seat 11-piston rod 12-piston 13-connecting rod 14-bearing 15-damping plate 16-shell.

Detailed Description

Fig. 1 is a schematic structural view of the present invention, as shown in the figure: the pier damping device comprises a base, a vertical damping mechanism, a transverse damping mechanism and a top plate;

the vertical vibration reduction mechanism comprises a supporting seat 4, a spiral spring 5 arranged between the supporting seat 4 and a base 8, and a magnetorheological fluid damper arranged in the base 8 and used for applying a damping effect on the vibration of the supporting seat 4 along the vertical direction; the transverse vibration reduction mechanism comprises an ellipsoidal elastic roller 3 positioned between the top plate 2 and the supporting seat 4 and a magnetorheological fluid rotary damper 1 for applying a damping effect on the rotation of the ellipsoidal elastic roller 3; and ellipsoidal surfaces matched with the ellipsoidal elastic rollers 3 are formed at the bottom of the top plate 2 and the top surface of the supporting seat 4.

In the embodiment, the base 8 can be arranged on a pier stud, the top plate 2 supports the main beam, when the main beam or the pier vibrates in the vertical direction, the supporting seat 4 and the base 8 move relatively in the vertical direction, and the impact between the two is reduced by the aid of the spiral spring 5 between the two; in the process, the piston 12 slides in the cylinder 9 of the piston 12 in a reciprocating manner along the axial direction, and the magnetorheological fluid in the cylinder 9 of the piston 12 repeatedly flows through the damping hole on the piston 12, so that the damping of the vibration energy is realized; on the other hand, an ellipsoidal elastic roller 3 is arranged between the top plate 2 and the supporting seat 4, and when the beam body or the pier generates horizontal vibration, the roller generates reciprocating rotation to a certain degree, so that the vibration between the main beam and the bridge section is isolated; when the ellipsoidal roller rotates, the damping effect exerted by the magnetorheological fluid rotary damper 1 is exerted, and the reduction of the vibration energy is realized. In this embodiment, by controlling the magnitude of the current in the magnetorheological fluid damper or the magnetorheological fluid rotary damper 1, the viscosity of the magnetorheological fluid in the damper can be controlled, and finally the adaptive adjustment of the damping action of the damper is realized. The bridge piers and the main beams can be provided with sensors for detecting the vibration amplitudes of the bridge piers and the main beams, the vibration amplitudes of the bridge piers or the main beams are collected through the sensors, and the electrified current of the magnetorheological fluid damper or the magnetorheological fluid rotary damper 1 is controlled, so that the main beams or the bridge piers can intelligently adjust the self rigidity under the impact load to change the inherent frequency (vibration period) of the structure, and impact force and large deformation are resisted.

In this embodiment, the magnetorheological fluid damper includes a piston 12 cylinder 9 filled with magnetorheological fluid, a piston rod 11 axially extending into the piston 12 cylinder 9, a piston 12 fixed on the piston rod 11, and an electromagnetic coil wound outside the piston 12 cylinder 9; the piston 12 is provided with a damping hole for the magnetorheological fluid to pass through; in this embodiment, the upper end of piston rod 11 is connected with supporting seat 4 bottom through the screw, the lower extreme of piston rod 11 and the guide holder 10 sliding fit who sets up in piston 12 section of thick bamboo 9 bottom, piston 12 is fixed in the middle part of piston rod 11, piston 12 separates the inner chamber of whole piston 12 section of thick bamboo 9 for last cavity and lower cavity, when pier or girder take place vertical vibration, will drive piston 12 and slide from top to bottom, magnetorheological suspensions will flow back and forth between last cavity and lower cavity through the damping hole on piston 12 to produce the damping effect.

In this embodiment, the magnetorheological fluid rotary damper 1 includes a housing 16 fixed to the support base 4 and filled with magnetorheological fluid, a rotatable damping plate 15 located in the housing 16, a connecting rod 13 coaxially connected between the damping plate 15 and the ellipsoidal elastic roller 3, and an electromagnetic coil wound outside the housing 16; damping holes are also distributed on the damping plate 15, one end of the connecting rod 13 extends into the shell 16 from a through hole at the end part of the shell 16 to be fixedly connected with the damping plate 15, and a bearing 14 can be installed in the through hole of the connecting rod 13 so as to support the connecting rod 13 to rotate; certainly, a sealing ring is also arranged between the connecting rod 13 and the through hole of the shell 16 to avoid leakage of the magnetorheological fluid; the connecting rod 13 is connected with the roller through the flexible coupling, so that certain deviation between the axis of the connecting rod 13 and the axis of the roller is allowed when the magnetorheological fluid rotary damper 1 is installed, and the installation difficulty is reduced.

In this embodiment, the supporting seat 4 includes a supporting plate and a supporting pillar integrally connected to the bottom of the supporting plate; the top of the cylinder 9 of the piston 12 is integrally provided with a mounting sleeve in sliding fit with the supporting column; a plurality of diaphragm springs 6 which are arranged in a stacked mode are arranged in the mounting sleeve. The diaphragm spring 6 has the advantage of smaller axial size, and has high support rigidity and stronger bearing capacity; in addition, the elastic body formed by stacking the plurality of diaphragm springs 6 has an elastic supporting function even if one or a plurality of diaphragm springs 6 are broken, and thus has extremely high reliability.

In the embodiment, a honeycomb material 7 is filled between the cylinder 9 of the piston 12 and the inner wall of the base 8; the energy-absorbing material is filled in the honeycomb material 7, the honeycomb material 7 can be a honeycomb plate made of high polymer material, and the energy-absorbing material such as sand particles and the like is filled in a cavity inside the honeycomb plate; during vibration, friction and collision among sand particles reduce the transmission of vibration, and the effect of noise elimination and vibration reduction is achieved.

In this embodiment, in a natural state of the support seat 4, the stacking height of the diaphragm spring 6 is smaller than the vertical dimension of the installation space where the diaphragm spring is located; that is, when the girder or pier does not vibrate, the support seat 4 is supported only by the coil spring 5; when the main beam or the bridge pier vibrates to enable the distance between the supporting seat 4 and the base to be smaller than a set value, the diaphragm spring 6 starts to work, and due to the fact that the rigidity of the deformation initial section of the diaphragm spring 6 is large, when the main beam or the bridge section vibrates in a small amplitude, if the diaphragm spring 6 is used for supporting, a good vibration isolation effect cannot be achieved, and by adopting the structure, when the main beam or the bridge section vibrates in a small amplitude, the diaphragm spring 6 does not support, and only the supporting seat 4 is supported by the spiral spring 5, so that a good energy dissipation effect can be achieved, rigid collision is avoided, and a good protection effect is achieved on vibration isolation objects; when the amplitude is large, the supporting seat 4 is supported by the spiral spring 5 and the diaphragm spring 6 together after the diaphragm spring 6 is extruded by the supporting seat 4, and the supporting rigidity and reliability are improved.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.