Flexible base structure for ballastless track of high-speed railway and its paving method

Abstract

The invention discloses a flexible foundation structure for high-speed railway ballastless track and a paving method thereof, which comprises an asphalt base and an asphalt surface arranged sequentially from bottom to top. The asphalt base is a composite structure, including at least three layers of modified epoxy asphalt concrete layers, and the different modified epoxy asphalt concrete layers are bonded by an internal bonding layer; a lower bonding layer is arranged on the lower surface of the asphalt base, An upper bonding layer is arranged on the upper surface of the asphalt surface layer. The flexible basic structure provided by the invention has sufficient strength, durability and other performances. At the same time, the basic structure is better than the rigid basic structure using cement concrete in lateral resistance, elastic coefficient, vibration and noise reduction effect, waterproof and frost resistance.

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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