市政宽幅空心板梁桥加固设计关键技术

针对当前普遍暴露出来的装配式空心板梁桥病害，以武汉市三环线地面层五座空心板梁桥维修加固工程为背景，进行维修加固设计，提出的主要设计方法包括：梁体横向分块依次整体顶升的施工方案；新支座垫块双层设计；可根据现场实际情况进行适时调整的三种不同的支座垫块与墩台帽梁连接方式；铰缝跨缝植筋处理。施工过程及运营情况表明，这些设计方法在增加了施工的便利性，缩短了工期的同时，起到了良好的加固效果，有效恢复并提高了结构的整体受力性能、恢复了结构耐久性。

Key Techniques for Reinforcement Design of Municipal Wide Hollow Slab Beam Bridge

Aiming at the diseases of assembled hollow slab beam bridges that are commonly exposed at present, the maintenance and reinforcement design is carried out against the background of the maintenance and reinforcement project of five hollow slab beam bridges on the ground floor of Ring III Line in Wuhan. The main design methods proposed include the construction schemes of integral jacking of the beam by transverse blocks in turn, double-layer design of new support pad, three different connection modes between the support pad and the pier coping beam able to be adjusted according to the actual field situation, and the treatment of rebar planting across hinge joint. The construction process and operation condition show that these design methods not only increase the convenience of construction and shorten the construction period, but also play a good reinforcement effect, which effectively restore and improve the overall force performance of the structure, and restore the durability of the structure.