A kind of track subgrade structure and construction method thereof

Abstract

The invention discloses a track bed structure and a construction method for the same. The track bed structure comprises a bed base layer, a leveling layer and sleeper frames, wherein the bed base layer is laid on a bottom layer; the leveling layer is laid on the bed base layer; the sleeper frames are embedded to a set depth in the leveling layer, and are sequentially arranged along a line direction; each sleeper frame comprises a plate body and two columns of rail supporting platforms arranged on the two sides of the upper surface of the plate body; the rail supporting platforms are used for fixing a pair of parallel steel rails respectively; each rail supporting platform in each column of rail supporting platforms is used for fixing the steel rail on the rail supporting platform through fasteners; the length of each sleeper frame along the line direction is longer than a rail distance between the parallel steel rails; the leveling layer is used for limiting the sleeper frames along the line direction and a direction perpendicular to the line direction. According to the technical scheme, filled layers are laid between the sleeper frames and the leveling layer to eliminate the non-uniform settlement of the track bed structure and a foundation base; moreover, the track bed structure is simplified, and the non-uniform settlement of the track bed structure or the foundation base can be retarded or the influence of the non-uniform settlement can be reduced.

Description

technical field [0001] The invention relates to the field of rail transportation, in particular to a rail subgrade structure and a construction method thereof. Background technique [0002] With the development of the economy and the deepening of the urbanization process, the traffic pressure on ordinary roads in many large and medium-sized cities is increasing. Therefore, rail transit with high traffic efficiency (such as subways and urban railways) is deployed more and more widely. Effectively alleviate the pressure of ordinary road traffic. [0003] The track subgrade structure of the existing rail transit, the schematic cross-sectional view perpendicular to the direction along the line is as follows figure 1 As shown, it generally includes: a subgrade base 100 , a leveling layer 101 , a support layer 102 , a ballast bed 103 , a sleeper plate 104 and a steel rail 105 . The construction process of the existing track subgrade structure, such as figure 2 As shown, the sp...

AI Technical Summary

Problems solved by technology

[0027] In practical application, the inventors of the present invention found that the existing track subgrade structure built by the existing construction method will directly cause the displacement of the steel rail in the direction parallel or perpendicular to the horizontal plane when uneven settlement occurs along the line direction , or deformation occurs, which leads to the deterioration of the smoothness of the rail

And between the support layer 102 and the ballast bed 103 in the existing track subgrade structure, and between the ballast bed 103 and the sleeper plate 104, all are connected by steel bars. position, the ballast bed 103 defines the position of the sleeper plate 104 in the directions parallel and perpendicular to the horizontal plane; therefore, when the structure or its base produces uneven settlement, it is impossible to eliminate the uneven settlement by adjusting the track subgrade structure

Once the smoothness of the rails deteriorates beyond the specified range, it will seriously threaten the safety of trains

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