A point-laid period cushion vibration-reducing ballast bed

Abstract

The invention provides a spot-laid periodic cushion vibration-reducing track bed, which includes a periodic compound track bed slab and a concrete base arranged below it, and the space between the periodic compound track bed slab and the concrete base is limited by a limiting structure to prevent Relative displacement, wherein, the periodic composite track bed slab is formed by alternately arranging and consolidating concrete slabs and periodic cushions from top to bottom, and the projections of the concrete slabs in the vertical direction are completely coincident; each concrete slab is adjacent to its lower The periodic cushion layer constitutes a basic unit, and the number of periodic repetitions of the basic unit along the vertical direction is not less than 2; the periodic cushion layer is discretely distributed according to the law along the driving direction by a square cushion plate. The vibration-damping ballast bed forms elastic wave forbidden bands in the vertical direction, transverse direction and longitudinal direction, which can effectively control the propagation of vibration in three directions, and can actively adjust the forbidden band range by changing the structural geometric size and material composition, and has strong adjustability.

Description

technical field [0001] The patent of the present invention relates to the field of vibration reduction and noise reduction of rail transit, in particular to a vibration-reduction ballast bed laid with periodic cushion layers. Background technique [0002] At present, the rail vibration reduction measures widely used in the environmental vibration control of rail transit have exposed the following problems: (1) The principle of existing rail vibration reduction is to reduce the support stiffness or increase the vibration mass. Excessive vibration reduction or improper vibration reduction may cause wheel The abnormal wear of the rails will cause rapid and abnormal damage to equipment and parts, increase the workload of maintenance and repair of the wheel-rail system, and even affect the stability and safety of driving; (2) The vibration reduction section is long and the investment is high. Taking a 30km subway as an example, the cost increase caused by track vibration reductio...

AI Technical Summary

Problems solved by technology

[0002] At present, the rail vibration reduction measures widely used in the environmental vibration control of rail transit have exposed the following problems: (1) The principle of existing rail vibration reduction is to reduce the support stiffness or increase the vibration mass, and excessive vibration reduction or improper vibration reduction may cause wheel vibration. The abnormal wear of the rails will cause rapid and abnormal damage to equipment and parts, increase the workload of maintenance and repair of the wheel-rail system, and even affect the stability and safety of driving; (2) The vibration reduction section is long and the investment is high. Take the 30km subway as an example, the cost increase caused by track vibration reduction may reach 200 million yuan; (3) Passenger ride comfort is seriously damaged in the section paved with steel spring floating slabs

[0004] At present, there is no report on the periodic design of the structures involved in rail transit and the active regulation of vibration by using the forbidden band characteristics of periodic structures.

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