Support device for constructing continuous box girder bridge and elevation adjusting method

Abstract

The invention provides a support device for constructing a continuous box girder bridge and an elevation adjusting method. The continuous box girder bridge comprises an upper structure and a bridge pier bearing platform for bearing the upper structure; the upper structure on the sidespan of the continuous box girder bridge is provided with a concrete cast-in-place box girder; the support device supports the concrete cast-in-place box girder, and takes the bridge pier bearing platform of the constructed continuous box girder bridge as a stance of a steel tube holder in the support device to support the concrete cast-in-place box girder, and the safety of the cast-in-place section of the concrete box girder is ensured in the cast-in-place process; and the elevation adjusting method comprises a step of applying pre-jacking force on the concrete cast-in-place box girder through a jack to adjust the elevation of the concrete cast-in-place box girder, so that the control and adjustment of the altitude difference of the sidespan closure of prestressed concrete are facilitated.

Description

technical field [0001] The invention relates to the construction field of continuous box girder bridges, in particular to a support device and an elevation adjustment method for the construction of continuous box girder bridges. Background technique [0002] The long-span prestressed concrete continuous box girder bridge has been widely promoted and constructed in my country because of its low cost, convenient maintenance, and reasonable stress. For long-span prestressed concrete continuous box girder bridges, due to the requirements of cantilever construction technology in the construction of side-span concrete box girders, it is necessary to set up side-span cast-in-place sections, and the length of side-span concrete box girder cast-in-place sections is generally more than 6 meters. Because the concrete cast-in-place box girder is self-heavy, it must adopt the cast-in-place form of the bracket, and the structural form of the bracket and the internal force control during t...

AI Technical Summary

Problems solved by technology

[0003] At present, the support devices of concrete cast-in-place box girders mostly adopt floor scaffolding or steel pipe supports, etc., which use the ground to support the structure, and the foundation treatment at the support device must be carried out. However, due to the foundation settlement and the excessive internal force of the support during the construction process Safety accidents occur every year, and due to the accumulation of errors in the cantilever construction process, it is difficult to effectively control the height difference when the side spans are closed, which makes the height difference too large when the bridge is closed

Images