体外横张预应力技术在混凝土旧桥加固改造中的应用探索

Applied exploration of the external vertically tensioned prestress in the reinforcement and reconstruction of old bridge

针对目前在役桥梁病害,在分析常规体外预应力技术优、缺点的基础上,提出了应用体外横张预应力技术对旧桥加固改造的新构思,并以调控连续刚构桥运营期中跨跨中下挠为例,进行了论证分析,对其预应力束横向张拉空间和布束方案进行了探索性研究。

For the disease of existing bridge,the scheme of using vertically tensioned prestressed techniques to reinforce and reconstruct of old bridge is proposed according to the features of external prestress on the basis of analysis of its advantages and disadvantages.Take regulating the mid-span deflection of rigid frame bridge for example,the method of strand arrangement and stretching space were investigated and demonstrated.