Variable stiffness elastic support used for a ballastless track

Abstract

The invention relates to the field of rail transportation and provides a variable stiffness elastic support used for a ballastless track, which is in a composite structure consisting of a middle resilient sleeper bearing (7), a face plate (8) and a bed plate (6), wherein the surface of the middle resilient sleeper bearing (7) is provided with a nail column or a groove, and the interior of the middle resilient sleeper bearing (7) can also be provided with a hole; when being pressed to deform, the elastic support has variation in stiffness via the variation of compression area and free deformation area; the face plate (8) is contacted with the track structure of the ballastless track; the bed plate (6) is a flat plate provided with anchoring weld legs (5) and is cast with the concrete structures such as round bosses, square concave and convex grooves, lateral stop blocks and the like into a whole body. The stiffness of the elastic support has greater variation along with the increase of reduction or the increase of bearing stress, and presents an obvious nonlinear characteristic, the transmission of the vibration and particularly the transverse vibration of the track structure to the limit concrete and a bridge can be effectively reduced, the sideslip and the displacement of the track structure can be effectively limited, and the stability and the line security of the track structure are ensured.

Description

technical field [0001] The invention relates to the field of rail transportation, and mainly relates to a variable stiffness elastic bearing for a ballastless track, which is mainly used for buffering, vibration isolation and position limiting of the track structure of the ballastless track. Background technique [0002] Ballastless track has the characteristics of long service life, low maintenance cost, and good track geometry. It is widely used in the construction of high-speed railways and passenger dedicated lines in my country. The commonly used ballastless tracks in China include CRTS I, II, and III slab type Ballast track, Rheda 2000 ballastless track, Schuplin ballastless track, etc. In the bridge area, the high-speed running and braking of the train, the shaking at start-up, the centrifugal force, etc., as well as the temperature load will exert lateral and longitudinal forces on the track, which will cause the track to have a horizontal and vertical displacement tr...

AI Technical Summary

Problems solved by technology

The advantage of the rubber slab is that when the load is small, the stiffness is low, which can effectively reduce the vibration and noise of the track structure to the limit concrete and the bridge. The disadvantage is that the stiffness is still low when the load is large, which increases the deviation trend of the track structure , there are certain potential safety hazards; the advantage of filling resin is that it has high rigidity, which can effectively prevent the deviation of the track structure, but the disadvantage is that it has poor vibration isolation ability, poor repeated impact resistance and fatigue performance

Whether it is a rubber plate or a filled resin, it is difficult to meet the dual requirements of vibration isolation and limit at the same time

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