Flexible basic structure for high speed railway ballastless track and laying method of track

Abstract

The invention discloses a flexible basic structure for a high speed railway ballastless track and a laying method of the track. The structure comprises an asphalt base layer and an asphalt surface layer, wherein the asphalt base layer and the asphalt surface layer are sequentially arranged from bottom to top, the asphalt base layer is bonded with the asphalt surface layer through a middle binding layer, the asphalt base layer is of a composite structure and comprises at least three modified epoxy asphalt concrete layers, and the different modified epoxy asphalt concrete layers are bonded through internal binding layers; a lower binding layer is arranged on the lower surface of the asphalt base layer, and an upper binding layer is arranged on the upper surface of the asphalt surface layer. The flexible basic structure has enough strength and durability and other performance, and meanwhile transverse resistance, elastic coefficients, vibration attenuation and noise reduction effects and waterproof and anti-freeze performance of the basic structure are superior to those of a rigid basic structure of cement concrete.

Description

technical field [0001] The invention relates to a flexible foundation structure for a ballastless track of a high-speed railway and a paving method thereof, belonging to the high-speed railway construction engineering technology. Background technique [0002] Under the long-term load of high-speed trains, the traditional ballasted track will have problems such as rapid accumulative deformation of the ballast bed, serious ballast pulverization, mud turning, and compaction sinking. These problems will increase the maintenance cost of the high-speed railway. At the same time, it will pose a threat to the safety of high-speed railways. Therefore, high-speed railways need ballastless tracks that can ensure high stability, high ride comfort and high reliability of their lines. [0003] Ballastless track generally uses cement concrete as the rigid foundation structure. However, a large number of practical engineering application experience shows that due to the high brittleness an...

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Problems solved by technology

However, since asphalt concrete is directly affected by the cyclic impact of rails and sleepers and the change of external temperature, it must have sufficient strength, durability, high temperature stability and low temperature crack resistance, otherwise it will cause deformation and local thinning of asphalt concrete , the upper part of the sleeper is embedded, the lower part is stretched and cracked, and the waterproof function is lost. However, concrete such as emulsified asphalt cannot meet the above requirements. Cushion material on cement concrete base and surface layer material on cement concrete track bed of ballastless track, etc., but cannot be used as the whole flexible foundation structure material of ballastless track

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