Elastic vibration-reduction ballast bed system

Abstract

The invention discloses an elastic vibration-reduction ballast bed system, which comprises a concrete ballast bed and a low-frequency vibration isolator installed in the concrete ballast bed. An elastic mechanism in the low-frequency vibration isolator consists of a positive stiffness elastic element made of metal rubber or the positive stiffness elastic element and a negative stiffness elastic element which are connected in parallel. The positive stiffness elastic element is a disc spring, a spiral spring, the metal rubber, a metal rubber-spring armour, a metal rubber-lead core composite spring or any series-parallel combination of the disc spring, the spiral spring, the metal rubber, the metal rubber-spring armour and the metal rubber-lead core composite spring. The negative stiffness elastic element is a disc spring or a diaphragm spring. The elastic vibration-reduction ballast bed system can meet requirements of middle-high-grade vibration reduction and has a simple structure. The site construction process is simple and convenient, and consumed materials of the ballast bed are relatively reduced. Therefore, the elastic vibration-reduction ballast bed system is low in construction cost and suitable for popularization and application in the whole line.

Description

technical field [0001] The invention belongs to a railway track bed, and in particular relates to a track structure of a railway, specifically an elastic damping track bed system used in railways, high-speed railways, urban railways, subways and elevated light rails. Background technique [0002] In recent years, my country is gradually increasing the investment and construction of high-speed railways and urban rail transit (subway, urban railway, elevated light rail, etc.). High-speed railways shorten the travel time of passengers, and are energy-saving, environmentally friendly, safe and reliable. In big cities with traffic congestion, convenient and fast urban rail transit is more and more popular and has become the first choice for people to travel. Subsequently, the vibration and noise problems caused by rail transit that affect the surrounding environment of the line and residents' life and health have attracted more and more attention from researchers at home and a...

AI Technical Summary

Problems solved by technology

However, the steel spring floating slab track bed also has some shortcomings: (1) In order to achieve the designed vibration isolation effect, the concrete floating slab is bulky, heavy, and expensive, resulting in high engineering costs, and can only be used for special The required vibration reduction section cannot be promoted across the board; (2) The construction content is many, the process is complicated, and the cycle is long; (3) The damping ratio is a fixed value, which cannot meet the different requirements for the damping ratio of the resonance area and the vibration isolation work area at the same time

However, in practice, the stiffness and mass of the system are subject to certain constraints and cannot be arbitrarily reduced or increased

If the rigidity is reduced, the vertical deformation of the rail will be too large, which will reduce the lateral stability of the system and affect the driving safety; and the mass is limited by the structure and space, so it cannot be too large, such as the "Cologne egg" and elastic boots. , the vibration quality has been fixed and cannot be changed; for the steel spring floating slab ballast bed vibration damping system, although the vibration isolation effect can be improved to a certain extent by simply increasing the weight of the concrete floating slab, it will lead to excessive structural size. A series of problems such as large size, substantial increase in cost, and lengthened construction period make the economy worse

[0006] Therefore, the existing rail vibration reduction measures are difficult to achieve for the low-cost, relatively simple construction process, and the 15-40dB mid-to-high-end vibration reduction requirements that are suitable for full-line promotion.

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