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Asphalt slab ballastless track sub-rail foundation structure and quasi-static design method thereof

A ballastless track and infrastructure technology, applied in the field of rail transit, can solve the problem of no clear structural design method for the asphalt concrete track bed structure, etc.

Inactive Publication Date: 2018-08-14
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] However, there is currently no clear structural design method for asphalt concrete trackbed structures

Method used

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  • Asphalt slab ballastless track sub-rail foundation structure and quasi-static design method thereof
  • Asphalt slab ballastless track sub-rail foundation structure and quasi-static design method thereof
  • Asphalt slab ballastless track sub-rail foundation structure and quasi-static design method thereof

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Embodiment Construction

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0032] The under-rail foundation structure of the asphalt slab ballastless track of the invention is located above the surface layer of the ballastless track below the steel rail, and includes a three-layer layered structure of track slab-asphalt concrete layer-hydraulic support layer.

[0033] In order to control the fatigue damage, the control indexes of the bottom horizontal tensile stress of the track slab, the bottom tensile stress of the asphalt concrete layer and the bottom tensile stress of the hydraulic support layer are proposed.

[0034] For example, the track slab is taken as a prefabricated unit slab, the length of the track slab is 5000mm, the width is 2400mm, and the thickness is 190mm for the CRTS I t...

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Abstract

The invention relates to an asphalt slab ballastless track sub-rail foundation structure and a quasi-static design method thereof. The asphalt slab ballastless track sub-rail foundation structure is positioned above the surface of a ballastless track foundation bed below a steel rail and comprises a three-layer structure of track slab-asphalt concrete layer-hydraulic bearing layer. In order to control fatigue damage, track slab bottom horizontal tensile stress, asphalt concrete layer bottom tensile stress and base (or bearing layer) slab bottom tensile stress control indexes are provided. Compared with the beam-slab theory of elastic foundations where CA (cement asphalt) mortar is considered as a linear spring with no bending moment considered, the asphalt slab ballastless track sub-rail foundation structure and the quasi-static design method thereof have the advantages that the asphalt concrete layer and the hydraulic bearing layer are considered as a double-layer slab for an elasticfoundation, and the bearing characteristics of subgrade slab track structure are better met.

Description

technical field [0001] The invention relates to a design method of a slab-type ballastless track bed structure supported by asphalt concrete, belongs to the field of rail traffic, and is suitable for urban rail traffic and main-line rail traffic. Background technique [0002] The high-speed train runs fast, and the corresponding track structure has strong vibration and noise. Therefore, it is necessary to set up vibration and noise reduction facilities in the track structure design—in CRTS I and II slab ballastless track structures, cement emulsified asphalt mortar (CA mortar for short) can play a certain role in vibration reduction. The stiffness and strength of CA mortar are higher than that of ordinary asphalt concrete, but lower than that of cement concrete. It is characterized by the combination of rigidity and softness, with flexibility as the mainstay and rigidity at the same time. CA mortar is filled between the track slab with a thickness of 50mm and the concrete ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E01B2/00
CPCE01B2/00G06F2119/06G06F30/20
Inventor 方明镜陈豪陈浩
Owner WUHAN UNIV OF TECH
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