Forced closure construction method for vault of steel tube arch bridge mounted in cable-stayed buckling and cantilevered assembly mode

Abstract

The invention discloses a forced closure construction method for the vault of a steel tube arch bridge mounted in a cable-stayed buckling and cantilevered assembly mode, which comprises the steps thatit is determined that closure is conducted within a time period with the relatively stable temperature by observing the temperature and the change condition of the size of a closure opening for consecutive days; and the size of the closure opening at the set temperature is comprehensively researched and determined through the structural stress state monitored on site in combination with a software simulation calculation result and design requirements. Firstly, the overall line shape before closure is adjusted through a buckling system in a large cantilever state; then a closure opening fine adjustment device is adopted for forcibly and accurately adjusting the size of the closure opening, and a temporary locking device is adopted for locking part of the closure opening in time; then closure short steel pipes are mounted and welded on the unlocked part; and finally, the temporary locking device is detached, and closure short steel pipes are mounted on the rest part. Forced closure canbe achieved through a simple device and field operation, it is guaranteed that the stress state of the arch bridge after closure is matched with a design target, the closure is guaranteed to be in a bridge line shape, and the long-term service life of the bridge is prolonged.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a construction method for forced closure of the vault top of a steel pipe arch bridge installed with cable-stayed buckles and hangers, which is mainly used for steel pipes with multiple main chords that are constructed symmetrically with cable-stayed buckles and hangers on both banks The arch bridge is forced to be closed at the top of the vault. Background technique [0002] With the development and construction of the country, more and more steel pipe arch bridges have been built in recent years, especially the long-span arch bridges with poor construction conditions. In the past, the closing process of the arch roof was relatively rough, and the size of the closing opening was simply cut and installed directly according to the actual measurement on site, ignoring the long-term influence of factors such as the stress state of the arch ribs and temperature changes on the struc...

AI Technical Summary

Problems solved by technology

In the past, the closing process of the arch roof was relatively rough, and the size of the closing opening was simply cut and installed directly according to the actual measurement on site, ignoring the long-term influence of factors such as the stress state of the arch ribs and temperature changes on the structure during closing, and the final construction effect is often different from the design. Large deviation from target

In order to improve the influence of residual stress caused by the traditional closing process on the structure and improve the long-term service life of the bridge, it is necessary to explore a new closing method to solve such problems

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