Combined box-type subgrade without bottom plate and subgrade construction method

Abstract

The invention discloses a combined box-type subgrade without a bottom plate. The combined box-type subgrade comprises two bearing platforms, two lateral walls and a top plate, the top plate is a prefabricated concrete plate, and the lateral walls are prefabricated concrete walls; the two lateral walls are parallel to each other, the top plate is located on the bearing platforms, and the two vertical ends of both of the lateral walls are spliced with the two bearing platforms and the top plate correspondingly to form a hollow box body without the bottom plate. The invention further discloses asubgrade construction method. The subgrade construction method comprises the following steps: a foundation is treated, specifically, pipe piles or cast-in-situ bored piles are arranged in the foundation; the subgrade is laid, specifically, a first section of the subgrade is laid firstly, the concrete bearing platforms are poured on the foundation or the prefabricated bearing platforms are laid onthe foundation, the pile ends of the pipe piles or the pile ends of the cast-in-situ bored piles are anchored into the bottoms of the bearing platforms, then the lateral walls are connected with the bearing platforms, and then the top plate is fixed; and the subgrade laying step is repeated to lay other sections of the subgrade sequentially until laying is completed. According to the combined box-type subgrade without the bottom plate, land resources can be saved, the construction time of railway subgrade engineering can be shortened, and the construction cost of the railway subgrade engineering can be reduced.

Description

technical field [0001] The invention relates to a combined bottomless box-type roadbed and a roadbed construction method, belonging to the technical field of civil engineering. Background technique [0002] The current railway subgrade structure usually adopts a trapezoidal type, which is composed of the surface layer of the subgrade bed, the bottom layer of the subgrade bed and the subgrade body, and different standards of fillers are used in different parts for layered rolling treatment. The two sides of the subgrade structure are usually 1:1.5-1: The filling slope rate of 2 is sloped to the ground. This kind of railway subgrade structure has the advantages of safety and high operating comfort, and is currently the most widely used subgrade structure type at home and abroad. However, the width of this trapezoidal railway subgrade structure is several times the width of the subgrade surface, and it needs to occupy more land resources such as cultivated land and forest land...

AI Technical Summary

Problems solved by technology

However, the width of this trapezoidal railway subgrade structure is several times the width of the subgrade surface, and it needs to occupy more land resources such as cultivated land and forest land. Due to the lack of qualified fillers in plain areas, the fillers need to be transported over long distances, and the foundation soil The layer is generally deep and soft, and foundation treatment is required, resulting in a longer construction time and higher construction costs for railway embankment projects

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