Underneath light roadbed structure passing operation bridge and design and construction methods thereof

Abstract

The invention discloses an underneath light roadbed structure passing an operation bridge and design and construction methods thereof. The structure comprises double rows of long piles, short piles, alight body, a U-shaped light groove and drainage ditches. Double rows of long piles are respectively arranged at two ends of a roadbed; the double-row long piles are longitudinally arranged at intervals along a line and are close to a bridge foundation relative to the short piles. The short piles are arranged at the bottom of the roadbed inside the long piles; the light body is arranged on the pile tops of the long piles and the short piles, the U-shaped light groove is formed in the top of the light body and filled with soil fillers, connecting steel bars are anchored into the upper portionsof the long piles and the upper portions of the short piles, and steel bar layers having net structures are arranged on the tops of the long piles and the tops of the short piles and are fixedly connected with the connecting steel bars. The light soil material is low in density, high in pressure resistance, upright and attractive, the purpose of underneath passing through a bridge to build a roadbed can be achieved, the normal use function of a bridge structure can be guaranteed, safe operation of various vehicles on the bridge is guaranteed, land can be saved for local economic construction,and ecological environment damage can be reduced.

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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