Ballastless track structure

Abstract

The invention relates to a ballastless track structure, which aims at effectively meeting the requirements of a high-speed railway on the smoothness and the comfort of the ballastless track, facilitating the construction of track slabs, reducing the maintenance and repair of the track structure and prolonging the service life of the track structure. The ballastless track structure comprises a bearing layer (10), track slabs (20) lengthwise paved along a line and an adjustment layer positioned between the bearing layer (10) and the track slabs (20), wherein the adjustment layer is a self-compact concrete layer (30), the track slabs (20) and the self-compact concrete layer (30) are connected into a whole by connecting members, and the bearing layer (10) is provided with a spacing structure acting on the self-compact concrete layer (30).

Description

technical field [0001] The invention relates to a railway ballastless track, in particular to a ballastless track structure for a high-speed railway. Background technique [0002] The ballastless track structure is mainly composed of structural layers such as track slab, adjustment layer and bearing layer. The track slab adopts a prestressed reinforced concrete structure, and the bearing layer is laid on the underground foundation. Among them, the adjustment layer is a key structural layer for the elastic adjustment and force transmission support of the ballastless track structure, which directly affects the fast and safe operation of the high-speed train. In the existing ballastless track structure, the track slab usually adopts a prestressed reinforced concrete structure. In order to avoid cracking of the slab body, multiple groups of prestressed steel rods are evenly distributed in the horizontal direction of the slab body. The track slab is laid longitudinally on the ad...

AI Technical Summary

Problems solved by technology

Its disadvantage is that after the line runs for a period of time, the track slab and the asphalt mortar adjustment layer will peel off, and the longitudinal end of the track slab is prone to warping, which will undoubtedly affect the stability, comfort and track structure of the train. adversely affect the lifespan of

There is also a longitudinally connected slab ballastless track structure, but its connection type is basically the same as that of longitudinal prestressed steel bars, the connection structure is complicated, and the construction is more cumbersome

In addition, cement-asphalt mortar (CA mortar) is generally used for the adjustment layer. The advantage of the CA mortar adjustment layer is that it can be easily repaired and replaced. However, due to the low strength of the CA mortar material, it is difficult to withstand long-term fatigue loads, and the construction process of CA mortar is cumbersome. , must be equipped with special mixing and pouring equipment, and the cement hardening time is long, and the strength rises slowly, which has a great impact on the construction progress

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