Framed sleeper unit

Abstract

A framed sleeper unit comprises two longitudinal sleepers and a plurality of horizontal sleepers. The horizontal sleepers are arranged between the longitudinal sleepers to form the frame sleeper unit. Two ends of each longitudinal sleeper are provided with joint structures to link two adjacent framed sleeper units. The frame sleeper units are laid on a granular-mixture ballast bed or a concrete ballast bed along a railway track direction, and rails are placed on a rail bed and connected with the sleepers through a fastening system. The framed sleeper unit has the advantages that under wheel load action, crushing never occurs to the rail seat; contact areas of the sleepers and the ballast bed are expanded, pressure applied to the top face of the ballast bed is reduced, and stability of the rail structure is improved; influence of wheel rail impact load to the ballast bed is reduced; rail support uniformity is enhanced, and rail surface dynamic harshness is maintained; maintenance of the ballast track of a high-speed railway is facilitated, and maintenance cost is lowered.

Description

Technical field [0001] The invention belongs to the technical field of railway transportation, and relates to track structures, and is particularly suitable for sleepers for high-speed railways, urban rail transportations and general railway station sections in severe cold and frozen soil areas. Background technique [0002] Track is one of the main structures of railway infrastructure. To ensure the normal operation of high-speed railway, the deformation of track structure must be controlled. High-speed railways often use ballastless track structures. In some seasonally frozen soil subgrade sections, the track structure is subject to freezing and thawing, which causes the track surface to sink. In severe cases, high-speed trains are restricted or suspended. The railway public works department has to maintain and repair the line, especially the ballastless track structure is designed for less maintenance or maintenance-free requirements. In this way, the railway public works depa...

AI Technical Summary

Problems solved by technology

The railway works department has to maintain and repair the line, especially the ballastless track structure is designed according to the requirements of less maintenance or no maintenance. In this way, the railway works department can only renovate the roadbed after removing the track structure of this section. The cost of maintenance and repair is much more than that of ballasted track

In addition, the uneven settlement of urban rail transit tunnel structures along the line direction will inevitably lead to bad track surface irregularities. In order to control the track surface irregularities caused by the uneven settlement of these lines, a new type of sleeper is objectively needed

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