Construction method of simply supported-continuous switching system of negative moment beam prestressed precast box beam

Abstract

The invention discloses a construction method of a simply supported-continuous switching system of a negative moment beam prestressed precast box beam, sequentially comprising the following procedures of construction preparation, cap beam position line putting, installation of a rubber vibration isolating support and a beam bottom steel plate, manufacture and installation of a temporary support, box beam shipping emplacement installation, beam end reinforcement connection, negative moment beam prestressed pipe connection and penetration, construction of a cross beam, negative moment beam prestress penetration tensioning and hole grouting, longitudinal wet joint construction and disassembly of the temporary support. According to the construction method disclosed by the invention, by adopting negative moment beam prestressed pipe connection, negative moment beam prestressed pipes have high compression strength and smooth surfaces, can bear pressure of the box beam and transfer the pressure to a cap beam, is beneficial to ensuring the engineering quality and increases the safety coefficients; with the adoption of the construction method, standard technical operation is beneficial to implementing, a construction period is shortened, a box beam continuous system has large rigidity, less expansion joints, is small in deformation and is comfortable in car driving, the safety and reliability of system switching are improved, and beam body quality control and safe and civilized construction management are convenient; and the construction method is economic and applicable.

Description

technical field [0001] The invention relates to the processing method of the bridge structure of the international patent classification E01D, especially the construction method of the negative moment bundle prestressed prefabricated box girder first simply supported and then continuously converted. Background technique [0002] In the known technology, the prefabricated box girder first simply supported and then continuous bridge structure system is widely used in highway bridges. However, in the prior art, the construction method of the prefabricated box girder first simply supported and then continuously converted system is rarely disclosed. Representative technologies such as patent applications No. 201010223159 discloses the construction method that the bridge is first simply supported and then forms a continuous beam and then removes the temporary dielectric steel support. The simply supported temporary support is first set, and the prefabricated beam is erected on the ...

AI Technical Summary

Problems solved by technology

[0003] On the basis of continuous engineering actual construction management and technical discussions, many important defects in the aforementioned existing construction methods have been gradually discovered. For example, pouring concrete at the ends of the two corresponding prefabricated beams directly forms a connecting body that cannot adapt to structural stress. These research results are also reflected in the promulgation and implementation of the new JTG D60-2004 "General Code for Design of Highway Bridges and Culverts" and JTG D62-2004 "Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts". Obviously, The original construction method of simple support first and then continuous conversion system can no longer meet some requirements of the new code, and the better construction method improvement technology that is urgently needed has not yet been made public

Images