Side span cast-in-place section less-excavation structure and construction method

Abstract

The invention relates to a side span cast-in-place section less-excavation structure. The side span cast-in-place section less-excavation structure comprises a box girder, a concrete cushion layer, side slope upper and lower steps, a bridge abutment, a sand cushion layer, a side span bridge abutment and a box girder bottom manhole, wherein the box girder is arranged at the upper portion of the bridge abutment; the concrete cushion layer and the sand cushion layer are sequentially laid on a bottom form of an unexcavated slope at the bottom of the box girder; the box girder bottom manhole is formed in the position, close to the side span bridge abutment, of the bottom of the box girder and located above an excavation channel; one side of the excavation channel is provided with a reserved unexcavated surface; and side slopes are excavated on the two sides of the box girder and provided with the side slope upper and lower steps. The side span cast-in-place section less-excavation structure has the beneficial effects that a side span cast-in-place section is subjected to less-excavation construction so that the construction period can be greatly shortened, and meanwhile, the original appearance of a mountain is protected, and the virtuous circle of the green construction ecological environment and the sustainable development concept of the social environment are guaranteed while resource waste is reduced; and it can be guaranteed that internal inspection of a bridge and support replacement are convenient, and design and maintenance of a manhole channel are more convenient and faster.

Description

technical field [0001] The invention relates to the technical field of construction of side span cast-in-place sections of bridges in mountainous areas, in particular to a structure with less excavation at the bottom of the side-span cast-in-place sections of road cuttings and a construction method. Background technique [0002] The traditional construction of the cast-in-place section of the side span of the cutting generally adopts the construction method of slotting and deep digging the bottom formwork of the support. Allow space for seat maintenance and replacement. When the excavation depth is deep, the slope excavation and the reserved construction work surface on both sides are considered at the same time, resulting in a substantial increase in the amount of earth and stone excavated in the mountain, which requires a lot of manpower and material resources, especially due to the complexity of the construction technology and the limitation of the work surface Double im...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a side-span cast-in-place section with less excavation structure and construction method in view of the problems of large excavation surface, large engineering quantity and serious damage to the original mountain body in the general excavation method of high side and steep slope in mountainous areas.

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