track floating track bed

Abstract

The invention belongs to a railway track bed, and discloses a floating track bed. The floating track bed comprises floating slabs and elastic supporting elements. The adjacent floating slabs are connected through shearing force transmission devices. The elastic supporting elements are located between a base and the floating slabs. The floating slabs are supported on the elastic supporting elements. The floating track bed further comprises back pressure devices which comprise back pressure elastic elements and connecting pieces. One ends of the connecting pieces are fixed to the base, and the other ends of the connecting pieces are matched with the corresponding back pressure elastic elements. The floating track bed disclosed by the invention is simple in structure, system inherent frequency variation is reasonable and controllable, the vibration and noise levels are low, the vibration adsorbing and noise reducing performance is stable, the vibration isolating efficiency is high, the service life is long, the safety is better, and the floating track bed can be widely applied to track bed structures of different rail transit types including railways, metros, urban railways, elevated railways, high speed railways and the like and has wide market application prospects.

Description

technical field [0001] The invention belongs to a railway track bed, and in particular relates to a railway track structure, which can be a track bed for railways, subways, urban railways, elevated light rails, high-speed railways, and the like. Background technique [0002] Vibration and noise are recognized as the most widely affected public nuisances, and they are also an urgent problem to be solved in the development of rail transit in recent years. Among the existing vibration and noise reduction technologies for rail transit, the most successful practical application is the component floating technology, typically the floating track bed technology, which has high vibration isolation efficiency and stable working performance, which has become a consensus in the industry. In particular, the floating track bed of the new prefabricated short floating slab structure has been widely recognized by the market and users due to its advantages of fast construction speed and guara...

AI Technical Summary

Problems solved by technology

However, since multiple steel spring vibration isolators are often used in this type of vibration isolation system at the same time, and each steel spring vibration isolator may contain multiple steel spring elements, under the cumulative effect of various processing errors and assembly errors , the static load provided by the self-weight of the floating plate is often unable to make all or most of the steel spring elements enter the stage of linear change in which the external force they bear is proportional to their own compression displacement, even after the rail vehicle is operated by applying a dynamic load, due to the frequency When it is higher (for example, above 10Hz), the amplitude of the vibration of the floating plate is small, and it is still possible that a considerable part of the steel spring elements are completely or partially in the working stage of nonlinear changes

In this case, the natural frequency of the entire vibration isolation system is always in an uncertain state of change, and it cannot be guaranteed that the natural frequency parameters of the vibration isolation system are at the most reasonable level, and its vibration isolation effect cannot be optimal.

In addition, another problem with the floating ballast bed of the prefabricated short floating slab structure is that when the rail vehicle enters from one end, due to the lighter weight of the prefabricated short floating slab, there will be a seesaw effect, that is, the prefabricated short floating slab The other end of the slab tends to lift upwards. If it cannot be effectively controlled, the vibration isolator on the slanted side of the prefabricated short floating slab will have insufficient pressure. When this happens, it is easy to cause problems such as the displacement of the prefabricated short floating plate or the overturning of the elastic components in the vibration isolator, which brings safety hazards to daily operations

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