Horizontal elastic limiting and longitudinal hydraulic fusing damping combined support system

Abstract

The invention discloses a horizontal elastic limiting and longitudinal hydraulic fusing damping combined support system. A hydraulic fusing damping support is utilized to achieve longitudinal restraining, a limiting height-adjusting rubber support is utilized to achieve horizontal restraining, the hydraulic fusing damping support is arranged on the same midspan side between the top of a first main pier and the bottom of a girder, the limiting height-adjusting rubber support is arranged between the inner side of an arch springing and the outer side of the girder, and a second main pier opposite to the first main pier is provided with a bidirectional movable spherical steel support. The longitudinal restraining is in a locked state in normal situation to guarantee that the longitudinal restraining can be achieved under the action of brake force and the action of track force in an application period. When earthquake happens, the longitudinal restraining is unlocked to have a damping function. The longitudinal restraining is also in the locked state after the earthquake. The horizontal restraining can guarantee horizontal limiting in the application period, prevent the support from being hung in the air and reduce horizontal earthquake force. In earthquake or rare-occurrence earthquake, pier bodies and a foundation can work in an elastic range, so that the resistance of a bridge to the earthquake intensity is improved, traffic smoothness at key traffic nodes is maintained, and significance in earthquake relief work is achieved.

Description

technical field [0001] The invention relates to a bridge support system, in particular to a main girder support system applied to highway and railway arch bridges, cable-stayed bridges and suspension bridges. Background technique [0002] The bridge support system is used to restrain the bridge longitudinally and laterally. Usually, the longitudinal restraint system and the transverse restraint system are used together to ensure the normal use of the bridge. [0003] Common longitudinal restraint systems and their disadvantages are as follows: [0004] 1. The main pier is equipped with two longitudinal fixed supports: most of the vertical force of the beam is transmitted to the arch rib through the suspender, and the type of the support on the top of the pier is small. This kind of support cannot withstand the seismic horizontal force of the entire beam body. Under strong earthquakes, the support is often sheared, resulting in damage to the bridge structure or even falling ...

AI Technical Summary

Problems solved by technology

This kind of support cannot withstand the seismic horizontal force of the entire beam body. Under strong earthquakes, the support is often sheared, resulting in damage to the bridge structure or even falling beams;

[0005] 2. Velocity lockers are installed at the two main piers: during an earthquake, the velocity lockers of the two main piers equally share the seismic force of the beam, which can appropriately reduce the seismic force borne by a single point, but cannot play the role of vibration reduction

As the earthquake force continues to increase, the steel box girder will be damaged and difficult to repair

In addition, the type of speed locker on long-span bridges is large and the cost is high;

[0006] 3. Longitudinally set (shearable) shear clamps at the centerline of the bridge: Due to the braking force and fatigue strength, the shear force of the shear clamps should not be too small, otherwise the "shear" isolation effect will not be obvious. At the same time, the steel box girder A strong stiffening structure needs to be set up, resulting in a complex structure and high cost of the steel box girder;

[0007] The above three types of support systems need to be operated by the top beam due to the damage of the support or the damage of the beam after the earthquake. Maintenance and repair after the earthquake are difficult, the repair time is long, and the cost is high.

[0008] 4. Viscous dampers are arranged at the main pier: because they do not meet the requirements for longitudinal fixation of the main girder under the action of temperature and braking force, they are generally only used in bridges with stay cables or other longitudinal constraints on the girders of long-span cable-stayed bridges. , a narrow range of applications

[0011] 2. Ordinary rubber bearings are arranged horizontally: when the width of the bridge deck is wide, under the action of cooling and lateral force, the bearings are often easy to fall out of the air frequently, causing the bearings to damage the bridge deck and track displacement, which cannot meet the lateral limit of train traffic Require

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