Lightweight subgrade structure, design and construction method of underpassing bridges in operation

Abstract

The invention discloses the structure, design and construction method of the light subgrade of the bridge under the operation. Long piles, double rows of long piles are arranged longitudinally along the line and close to the bridge foundation relative to the short piles. The quality trough is set on the top of the light body, and the U-shaped light trough is filled with soil filler. The upper part of the long pile and the short pile is anchored into the connecting steel bar. Structure, the reinforcement layer is fixedly connected with the connection reinforcement. Lightweight soil materials have low density, strong compressive capacity, and upright appearance. This method can achieve the purpose of building subgrades under bridges, ensure the normal use of bridge structures, and ensure the safe operation of various vehicles on the bridge. Local economic construction saves land and can also reduce ecological environment damage.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a lightweight subgrade structure, design and construction method of a bridge passing under operation. Background technique [0002] In recent years, with the rapid development of rail transit, it is inevitable that new (structure) buildings and existing buildings (structure) will cross influence, and the relationship between the two includes close adjacency, overspan, underpass, etc. Under the additional load of new (structure) buildings, the existing buildings (structure) may have uneven settlement, tilt instability, crushing and fracturing and other diseases, and even cause major safety accidents. [0003] At present, in the process of rail transit construction, it is unavoidable to construct subgrade works under the operating bridges. The new construction may have engineering disturbance effects on the operating bridges. If the load of the newly built subgrade...

AI Technical Summary

Problems solved by technology

Under the additional load of new (structure) buildings, existing buildings (structures) may have uneven settlement, tilt instability, crushing and fracturing and other diseases, and even cause major safety accidents

[0003] At present, in the process of rail transit construction, it is unavoidable to construct subgrade works under the operating bridges. The new construction may have engineering disturbance effects on the operating bridges. If the load of the newly built subgrade structure is too large, it is easy to cause uneven deformation or lateral deformation of the operating bridges. Displacement affects the normal function of the bridge, especially for high-speed railway bridges with millimeter-level deformation control. Deformation exceeding the limit will affect the comfort of high-speed train operation, and may even cause the train to derail

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