Strengthening and reinforcing measure for existing bridge during shield underpassing of high-speed railway bridge

Abstract

The invention belongs to the field of bridge reinforcing, and relates to a strengthening and reinforcing measure for an existing bridge during shield underpassing of a high-speed railway bridge. Pilefoundations are supplemented in the mode of newly building cast-in-situ bored piles, the influence of construction of the newly-arranged piles on an existing structure is reduced, the new pile foundations share the load of a bearing table, the load of original pile foundations is reduced, and the bearing ability of the bridge pile foundations is improved; meanwhile, the bearing table is expanded through an open-cut method, the stability of the bearing table is improved, the vertical load of the original pile foundations is reduced, and the structural stability is improved; pier body reinforcing is further conducted through a method of increasing the bridge pier area, light bridge piers are treated to become the solid bridge piers, the stiffness of the bridge piers is improved, the load transmitted to the bearing table by the bridge piers is reduced, the bearing force of the foundations is increased, the stability of the foundations is improved, and the influence of shield constructionon the existing high-speed railway bridge piers is reduced. The method has the characteristics that the construction period is short, the influence on the original high-speed railway bridges is small,and the new structure and the old structure bear force jointly; and the influence of shield underpassing on the bridge is reduced while safety operation of an existing line is ensured.

Description

technical field [0001] The application relates to a reinforcing measure for an existing bridge when a shield tunnel passes through a high-speed railway bridge, and belongs to the field of bridge reinforcement. Background technique [0002] With the continuous development of my country's economy, high-speed rail has become an important part of transportation, and its position in transportation is particularly important. Bridges are an important part of high-speed rail, and the safety and stability of bridges play a decisive role in the operation safety of high-speed rail. Faced with so many bridges, more and more bridges and new constructions are intersecting or running parallel to each other, and the construction of new constructions will have a certain impact on the existing high-speed railway bridges to a certain extent, thus bringing new problems to the operation of high-speed railways. to hidden dangers. Therefore, the reinforcement of the old bridge has become an indi...

AI Technical Summary

Problems solved by technology

However, due to the high speed of high-speed trains, the requirements for settlement are also higher, and most of the existing technologies cannot control the deformation within the required range.

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