大跨度T构桁架梁桥维修加固设计与施工

Maintenance and Reinforcement Design and Construction of Long Span T-shaped Truss Beam Bridge

以武汉市某T构桁架梁桥维修加固项目为背景,介绍了桥梁的现状、病害情况。结合维修加固目标,制定了拆除原挂孔混凝土T梁、更换为工字型钢板叠合梁、粘贴钢板法加固牛腿等加固措施,减小了桥梁结构恒载,增强了桥梁的结构安全性能。桥梁施工监控可实现24 h不间断应力监测,实测值远小于理论值,确保施工过程结构安全。

Taking the maintenance and reinforcement project of a T-shaped truss beam bridge in Wuhan as the background,the current situation and disease situation of the bridge were introduced.Based on the maintenance and reinforcement objectives,reinforcement measures such as dismantling the original hanging hole concrete T-beams,replacing them with I-shaped steel plate composite beams,and pasting steel plates to reinforce the brackets have been formulated,reducing the dead load of the bridge structure and enhancing the structural safety performance of the bridge.Bridge construction monitoring can achieve 24-hour uninterrupted stress monitoring,and measured values were far less than theoretical values to ensure structural safety during the construction.