Point laying periodic cushion layer vibration reduction ballast bed

Abstract

The invention provides a point laying periodic cushion layer vibration reduction ballast bed which comprises a periodic composite ballast bed plate and a concrete base arranged below the periodic composite ballast bed plate, the periodic composite ballast bed plate and the concrete base are limited through a limiting structure, and relative displacement is prevented. The periodic composite roadbed bed plate is formed by alternately arranging and solidifying concrete slabs and periodic cushion layers from top to bottom, and the projections of the concrete slabs in the vertical direction completely coincide. Each concrete slab and the adjacent periodic cushion layer below the concrete slab form a basic unit, and the number of periodic repetitions of the basic units in the vertical direction is not less than 2; and the periodic cushion layer is formed by regularly and discretely distributing square cushion plates along the driving direction. Elastic wave forbidden bands are formed in the vertical direction, the transverse direction and the longitudinal direction of the vibration reduction ballast bed, propagation of vibration in the three directions can be effectively controlled, the forbidden band range can be actively adjusted by changing the geometric dimension of the structure and material composition, and adjustability is high.

Description

Technical field[0001]The present invention relates to the field of track traffic damping noise reduction, and more particularly to a dotting cycle cushion damping bed.Background technique[0002]At present, the rail transformation measures widely adopted by the rail transit environment have exposed the following issues: (1) The principle of existing track damping is to reduce the stiffness of the support or increase the quality of the vibration, and may cause the wheel. Tracks from rails, resulting in fast abnormal injuries of equipment and components, increase wheel rail system maintenance and maintenance work, and even affect the stability and safety of driving; (2) long, high investment, with a long investment 30km Metro as an example, the increase in cost increase can reach 200 million yuan; (3) The passenger ride of the steel spring floating plate is seriously damaged.[0003]Solid physics studies have found that the incident waves cannot be propagated in the periodic medium when t...

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 periodical design of the structures involved in rail transit to realize the active regulation of vibration by using the forbidden band characteristics of periodic structures.

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