Overhead roadbed structure, roadbed assembly, roadbed system and construction method

Abstract

The invention belongs to the field of geotechnical engineering, in particular to an overhead roadbed structure, a roadbed assembly, a roadbed system and a construction method. The overhead roadbed structure comprises a bearing plate, a foundation bed surface layer is filled between the two retaining walls; a plurality of joists are arranged at the bottom of the bearing plate, at least two pile foundations are connected to the bottom of each joist in the length direction of the joist at intervals, track structure foundations are arranged on the surface layer of the foundation bed, buffer layersare compacted between the track structure foundations and the retaining wall, and when the number of the track structure foundations is at least two, buffer layers are also compacted between the adjacent track structure foundations. In the overhead roadbed structure, not only is the foundation treatment work amount is small, the occupied area is small, the use amount of filler is small, the construction quality is more controllable, the environment-friendly property is realized, the construction cost is lower, but also the dynamic stress, the dynamic displacement and the fatigue effect of thehigh-speed rail train on the bearing plate and the lower structure can be reduced, and meanwhile later operation and maintenance of the rail structure and the bearing plate are facilitated.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to an overhead roadbed structure, a roadbed component, a roadbed system and a construction method. Background technique [0002] High-speed railways have particularly high requirements for post-construction settlement of subgrades. In order to control post-construction settlements and meet the requirements for safe operation and comfort of high-speed railways, strong foundation treatment measures are often required for existing railway subgrades, especially for filled subgrade sections. The embankment filling section of high-speed railway mostly adopts trapezoidal type, and the two sides are sloped to the ground, and foundation treatment is done on the ground, such as "Buried Joist Pile-Slab Structure" (CN103397656A), "A Four-Line Ballastless Track Subgrade Pile-slab structure" (CN204644799U), "A construction method and subgrade structure for strengthening and tre...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to: in view of the roadbed structure of "filling soil + foundation treatment" in the prior art, the foundation treatment area is large, the land occupation width is large, a large amount of roadbed filler is required, and the construction cost is high; The railway will impose a lot of dynamic stress, dynamic displacement and fatigue stress on the grid, which will have a certain impact on the safety of the grid, which is inconvenient for the operation and maintenance of the track structure and the grid structure in the later stage. An elevated subgrade structure is provided , subgrade components, subgrade systems and construction methods, not only the amount of foundation treatment is small, the floor area is small, the amount of filler is less, the construction quality is more controllable, environmentally friendly and the construction cost is lower, and it can reduce the impact of high-speed trains on the bearing plate. And the dynamic stress, dynamic displacement and fatigue of the substructure, and also facilitate the later operation and maintenance

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