CN208250896U - A kind of hydraulicdriven accelerating quality damping system - Google Patents

Abstract

The utility model provides a hydraulic transmission acceleration mass damping system. The hydraulic transmission acceleration mass damping system includes tuning masses, hydraulic actuators, springs and connectors, which can effectively reduce the longitudinal displacement of the main girder generated by the earthquake force, thereby reducing the bending moment of the bridge pier. A connecting piece is set at the bottom of the main girder to connect with the hydraulic actuator on the pier; the hydraulic actuator is two oil cylinders of different diameters connected together, the large diameter piston is connected to the main girder, and the small diameter piston is connected to the mass block ; A mass block moving vertically is set at the bridge pier, which is connected with a hydraulic actuator by a steel wire rope; the lower end of the mass block is connected with a spring. The kinetic energy obtained by the main beam during an earthquake is transmitted to the tuning mass through the hydraulic actuator. The hydraulic actuator can amplify the speed of the mass and make the mass absorb more kinetic energy, thereby reducing the kinetic energy of the main beam and achieving shock absorption. Purpose.

Description

An accelerated mass damping system for hydraulic transmission

technical field

The utility model belongs to the technical field of passive control of bridge structures, relates to the damping technology of bridges, and particularly relates to a hydraulic transmission acceleration mass damping system.

Background technique

When a long-span bridge undergoes an earthquake, the longitudinal displacement of the main girder is large, and the inertial force of the main girder will be transmitted to the piers, abutments or cable towers, causing these structures to bear large bending moments. At present, the usual shock absorption methods are: (1) using viscous dampers between the main girder and bridge piers, bridge abutments or cable towers; (2) using anti-seismic bearings. Although the conventional tuned mass damper (TMD) has a certain shock absorption function, it takes enough time to consume the kinetic energy of the earthquake, and the kinetic energy in the earthquake will be transferred to the structure in a short time, so the tuned mass damper The seismic damping effect applied to bridges is not obvious.

Utility model content

The utility model provides a hydraulic transmission acceleration mass damping system, which comprises a tuning mass block, a hydraulic transmission device, a spring and a connecting piece. The advantage of the utility model is that it can effectively control the vibration of the main girder, thereby reducing the damage to structures such as bridge piers, bridge abutments and cable towers caused by earthquakes. The utility model is also convenient to be placed in the existing bridge structure and convenient for construction.

Technical scheme of the utility model:

An accelerated mass damping system for hydraulic transmission, including a main beam 1, a hydraulic actuator 2, a spring 3, a mass block 4, a slideway 5 and a connecting piece 6; the bottom or end of the main beam 1 is connected to one end of the connecting piece 6, and the The other end of the piece 6 is connected to the hydraulic actuator 2, and the vibration of the bridge is transmitted to the hydraulic actuator 2 through the connecting piece 6; the hydraulic actuator 2 can amplify the effect in the process of transmitting the movement, and then connects to the mass block through the spring 3 4. The mass block 4 vibrates in the slideway 5, absorbs the kinetic energy transmitted from the main beam, and plays a role in controlling the vibration of the main beam; the hydraulic actuator 2 is two oil cylinders of different diameters connected together, and the large diameter piston and The main beam 1 is connected, and the small-diameter piston is connected with the mass block 4 .

The effect and benefit of the utility model are: the vibration in the horizontal direction of the main girder is transmitted to the hydraulic actuator through the transmission connecting rod. Since the diameters of the oil cylinders of the hydraulic actuator are different, the mass block can generate a higher speed, and the direction of the speed It can be transformed into the vertical direction, and the mass block absorbs the kinetic energy of the main beam to play an obvious damping effect and is not coupled with the direction of the earthquake.

Description of drawings

Fig. 1 is a schematic diagram of an accelerated mass damping system of a hydraulic transmission.

In the figure: 1 main girder; 2 hydraulic actuator; 3 spring; 4 mass block; 5 slideway; 6 connecting piece; 7 pier.

Detailed ways

The specific embodiment of the utility model is described in detail below in conjunction with technical scheme and accompanying drawing.

Example

The span of the bridge is arranged as a three-span continuous connection of 3×40 meters, with a width of 21 meters, and the main girder is a steel box girder. A horizontal connector 6 is set at the end of the main girder 1 to connect with the fixed hydraulic actuator 2; when the bridge vibrates under the action of an earthquake, the vibration will be transmitted to the hydraulic actuator 2 through the connector 6; the hydraulic actuator 2 is two Two oil cylinders of different diameters connected together, the large diameter piston is connected with the main beam, and the small diameter piston is connected with the mass block, the area ratio of the two pistons is the transmission ratio of the mechanism, which is taken as 4 here; In the process of transmitting motion, the effect can be amplified, and then connected to the mass block 4 through the spring 3; a mass block 1 that moves vertically is set at each beam end, and each mass block 1 weighs 5 tons; The block 1 vibrates in the vertical direction along the slideway 5; thus, it has the effect of controlling the vibration of the main beam.

Claims (2)

1. An accelerated mass damping system of a hydraulic transmission, characterized in that the hydraulic transmission accelerated mass damping system comprises a main beam (1), a hydraulic actuator (2), a spring (3), a mass block (4), a slideway (5), connector (6) and pier (7); one end of the main girder (1) bottom connection connector (6), the other end of the connector (6) and the hydraulic actuator (2) on the pier (7) ) connection, the vibration speed of the bridge is transmitted to the hydraulic actuator (2) through the connecting piece (6); the hydraulic actuator (2) transmits the received speed to the mass block (4), and the lower part of the mass block (4) A spring (3) is provided to assist the mass (4) to vibrate in the vertical direction along the slideway (5). 2. The accelerated mass damping system of hydraulic transmission according to claim 1, characterized in that, the hydraulic actuator (2) is two connected oil cylinders of different diameters, the large diameter piston and the main beam (1 ) are connected, the small-diameter piston is connected with the mass block (4), and the gear ratio should be greater than 4.