Monolithic track bed construction process for remodeling ballast track subgrade into ballastless track

Abstract

A monolithic track bed construction process for remodeling a ballast track subgrade into a ballastless track is characterized by comprising the following steps that a monolithic track bed is cast in place under an auxiliary girder; a track supporting platform mounting groove and a line pipe reserved pipe are reserved during casting; after the monolithic track bed is cast to reach the design strength, the auxiliary girder and an existing track are removed; a track supporting platform is mounted in the track supporting platform mounting groove; and after the track is finely adjusted and fixed, a grouting material is grouted to fix the track supporting platform, wherein the grouting material for fixing the track supporting platform is a high strength non-shrinkage grouting material. The monolithic track bed construction process for remodeling the ballast track subgrade into the ballastless track, provided by the invention is advantaged in that the construction time is greatly reduced, the cost is reduced, resources are saved, the track bed does not need to be integrally pushed and the process is safe and reliable because the monolithic track bed is cast in place under the auxiliary girder. And meanwhile, as the high strength non-shrinkage grouting material is adopted, the grouting operation can be finished within one skylight point and the use strength can be reached to open the line directly within one skylight point.

Description

technical field [0001] The invention relates to a railway track bed construction process, in particular to an integral track bed construction process for transforming a ballasted track subgrade into a ballastless track. Background technique [0002] In the existing design and construction plan, when the ballasted track subgrade is transformed into a ballastless track, a convenience beam is erected above the existing ballasted track, a box-shaped culvert is poured outside the convenience beam, and the top plate of the box-shaped culvert is used as a whole After the ballastless track bed is poured into shape, the box-shaped culvert is pushed into the existing excavated foundation of the ballast track. Since the culvert wall and floor cannot be reused after completion, the design and construction of the jacking culvert is supported by the top and back walls, which will waste a lot of construction resources, and the jacking operation needs to install jacks and other jacking devi...

AI Technical Summary

Problems solved by technology

Since the culvert wall and bottom plate cannot be reused after completion, the design and construction of the jacking culvert is supported by the top and back walls, which will waste a lot of construction resources, and the jacking operation needs to install jacks and other jacking devices in advance, and the jacking process cannot be carried out in a skylight Complete construction work within a point

At the same time, the pouring concrete of the existing rail bearing platform needs a 7-day curing period, the blockage time is long, and the vehicle transportation scheduling cannot be adjusted, which brings great inconvenience to the opening to traffic

The original jacking scheme has extremely high requirements on the overall flatness accuracy of the ballastless track bed, and the error is required to be within 1mm. The control of the jacking track construction is extremely difficult, and it is very likely to cause abandoned projects and bring inconvenience to the construction.

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