Lattice type underground diaphragm wall for large-span arch bridge in thick covering layer area and construction method

Abstract

The invention discloses a lattice type underground diaphragm wall for a large-span arch bridge in a thick covering layer area and a construction method. The lattice type underground diaphragm wall comprises a pair of underground diaphragm walls and a connecting beam connecting the two underground diaphragm walls, each underground diaphragm wall comprises a rectangular wall body defined by an outer transverse wall and a longitudinal wall, an inner transverse wall is further arranged in each underground diaphragm wall, a longitudinal bearing platform is arranged on the upper portion of each underground diaphragm wall, an arch support is arranged on each longitudinal bearing platform, and each underground diaphragm wall is filled with a rock-soil body. The characteristics that the underground diaphragm wall is excellent in bearing performance, high in rigidity and good in anti-overturning stability are fully played, meanwhile the bearing performance of the soil body in the lattice type underground diaphragm wall is reasonably utilized after the soil body is restrained in the circumferential direction, and therefore, the foundation form can meet the strict requirements of the large-span arch bridge on the bearing performance, the stability and the deformation of the foundation form along rivers and in the upper deep and thick covering layer area where bedrocks are deeply buried.

Description

technical field [0001] The invention belongs to the field of long-span bridge foundation engineering, and in particular relates to a lattice-type underground continuous wall and a construction method for large-span arch bridges in areas with thick covering layers. Background technique [0002] The abutments of traditional long-span arch bridges mostly adopt the form of open-cut gravity enlarged foundation to bear the huge vertical load and horizontal thrust transmitted by the superstructure of long-span arch bridges. horizontal and vertical displacements. At present, in order to meet the needs of engineering construction, there are more and more engineering projects to build long-span arch bridges along the river and along the river where the bedrock layer is buried deep. foundation, it will inevitably increase the difficulty of construction, increase the cost of the project, and prolong the construction period; and because of the geological conditions of the deep overburde...

AI Technical Summary

Problems solved by technology

At present, in order to meet the needs of engineering construction, there are more and more engineering projects to build long-span arch bridges along the river and along the river where the bedrock layer is buried deep. foundation, it will inevitably increase the difficulty of construction, increase the cost of the project, and prolong the construction period; and because of the geological conditions of the deep overburden in the area along the river and along the river, the stratum in the arch seat area is mostly hydraulically connected with the river and the river system. If the selected foundation form does not have Better anti-seepage and anti-seepage capabilities will bring many hidden dangers to the foundation construction and later service safety

[0003] As a structural form with anti-seepage, soil retaining and load-bearing functions, the underground diaphragm wall foundation has good adhesion to the soil, high construction efficiency, With the advantages of low construction noise and strong adaptability to different soil properties and lithology, the multi-wall underground diaphragm wall foundation and lattice underground diaphragm wall foundation have been widely used in Japan's cross-sea bridges, railways, highways and municipal bridge foundation projects. However, this kind of underground diaphragm wall foundation used in practical projects mostly utilizes its good vertical bearing capacity, and seldom takes advantage of its high rigidity and good anti-overturning stability.

Images