Process for jacking continuous box girder incapable of releasing constraints at two ends at the same time

Abstract

The invention discloses a process for jacking a continuous box girder incapable of releasing constraints at two ends at the same time. The process comprises the following steps: 1, releasing constraint at one end of the continuous box girder and setting a plurality of jacking points at the lower part of the continuous box girder; 2, arranging a jacking mechanism capable of performing jacking separately at each jacking point; 3, calculating and determining the jacking height of each jacking point, wherein the jacking heights H1, H2, H3, Hn-1 and Hn of the jacking points form a proportional linear relationship; 4, starting the jacking mechanisms, wherein the jacking points at the lower part of one end, with constraint, of the continuous box girder are not jacked and the other jacking points are correspondingly jacked to the heights H1, H2, H3, Hn-1 and Hn; 5, replacing or maintaining half or more of supporting seats close to one end, without constraint, of the continuous box girder and then resetting the jacking mechanisms and the continuous box girder; and 6, releasing constraint at the other end of the continuous box girder and repeating the steps. According to the process, the continuous box girder incapable of releasing the constraints at the two ends at the same time can be jacked and the supporting seats can be maintained or replaced, so that the safety of a continuous box girder structure is effectively protected.

Description

technical field [0001] The invention relates to a jacking process for a continuous box girder, in particular to a jacking process for a continuous box girder that cannot release constraints at both ends at the same time. Background technique [0002] Nowadays, overpass bridges are used in large-scale transportation hubs to save plane space and maximize traffic functions. However, after the overpass has been used for a period of time, the bearings below the continuous box girder of the overpass will age or be damaged. Once the bearings are aged or damaged, the bridge needs to be repaired to ensure traffic safety. The existing maintenance method is to lift the continuous box girder of the overpass , Replace the support or repair the support to reset the continuous box girder. [0003] Most of the traditional continuous box girder jacking adopts the synchronous jacking process, because most of the continuous box girders can release the constraints at both ends at the same time...

AI Technical Summary

Problems solved by technology

However, in some existing urban overpasses, the bridge structure is complex, and the maintenance of the bridge is often restricted by the adjacent bridges. For the situation where the constraints at both ends of the continuous box girder cannot be released at the same time, the synchronous jacking process cannot be applied; It is a difficult problem in the current engineering field to lift the continuous box girder whose constraints cannot be released at the same time, and then to replace the support and maintain it.

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