等应力束技术的设计与施工

文章首先介绍了等应力束技术的工程背景及特点;然后结合东洋河大桥升级加固工程,介绍了等应力束技术设计中的关键技术如总体张拉工艺、纵向张拉设备、纵向张拉端、横向张拉设备及装置、预应力钢束的起弯点和落弯点处的构造等;介绍了应力束技术施工及施工过程中出现的问题和应对措施,如精确控制钢束张拉应力,单点张拉和双点张拉的差别,首孔横张顺序对预应力效果的影响等。

Design and construction of equal stress beam technology

This paper first introduces the engineering background and characteristics of the equal stress beam technology. Then, according to the upgrading and strengthening project of Dongyang River Bridge, the key technologies in the design of equal stress beam technology are introduced, such as the overall tensioning process, longitudinal tensioning equipment, longitudinal tensioning end, transverse tensioning equipment and devices, and the structure of bending point and bending point of prestressed steel beam. This paper introduces the problems and countermeasures in the construction of the stress beam technology, such as the precise control of the tension stress of the steel beam, the difference between single point tension and double point tension, and the influence of the transverse tension sequence of the first hole on the prestressing effect.