Seismic reduction and isolation support for railroad bridge in near-field seismic area

Abstract

The invention discloses a seismic reduction and isolation support for a railroad bridge in a near-field seismic area. The upper surface of a longitudinal upper base plate is a plane, and the lower surface of the longitudinal upper base plate is a longitudinal concave cylindrical surface; the upper surface of a longitudinal middle base plate is a longitudinal convex cylindrical surface matched withthe lower surface of the longitudinal upper base plate, and the lower surface of the longitudinal middle base plate is a longitudinal concave cylindrical surface; the upper surface of a cross-shapedbase plate is a longitudinal convex cylindrical surface matched with the lower surface of the longitudinal middle base plate; the lower surface of the cross-shaped base plate is a transverse convex cylindrical surface; cylindrical surface bosses A are arranged on the two longitudinal sides of the lower portion of the cross-shaped base plate respectively; the upper surface of the transverse middlebase plate is a transverse concave cylindrical surface matched with the lower surface of the cross-shaped base plate; the lower surface of the transverse middle base plate is a transverse convex cylindrical surface; and the upper surface of the transverse lower base plate is a transverse concave cylindrical surface matched with the lower surface of the transverse middle base plate, so that normaloperation of railroad bridges in near-field areas is met, line smoothness is kept, earthquake reduction and isolation are realized, displacement after earthquake is small, and the functional requirements of vertical earthquake' beam jumping 'tension resistance, self-resetting after earthquake and the like are met.

Description

technical field [0001] The invention belongs to the technical field of bearings, in particular to a shock-absorbing and isolating bearing for railway bridges in near-field earthquake areas. Background technique [0002] With the continuous increase of my country's railway construction, it is inevitable that railway bridges must cross the near-fault seismic zone. For example, the railway project in the southwest mountainous area has the characteristics of high seismic intensity (up to 9 degrees), long seismic vibration period, and obvious vertical vibration. Railway bridges in near-field earthquake areas often adopt shock-absorbing and isolation designs. At present, most of the shock-absorbing and isolation designs use separate schemes in which shock-absorbing and isolating bearings and tensile devices are used together. [0003] The shock-absorbing and isolating bearings mostly use convex-concave spherical-type shock-isolating bearings. The equivalent radius of curvature of t...

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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides a shock-absorbing and isolation bearing for railway bridges in near-field earthquake areas, which can meet the requirements of maintaining track smoothness during normal operation of railway bridges in near-field areas, shock-reduction and isolation under earthquakes, and small displacement after earthquakes. Meet the functional requirements of vertical earthquake "jumping beam" tension resistance and post-earthquake self-resetting to solve the problems existing in the existing bridge seismic isolation bearings

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