三塔斜拉桥上部结构施工监控技术

Construction Monitoring Technology of Superstructure of Three-Tower Cable-Stayed Bridge

摘要: 斜拉桥施工控制是保证成桥达到理想受力状态的重要环节。本文以沣邑大桥为研究对象，模拟计算施工全过程并获得各施工阶段的理想状态，对索塔应力及线形、拉索索力、主梁应力及线形、大气及结构温度进行实时检测，通过实测结果分析与理论计算结果对比，分析施工误差状态并及时进行安全度评估及有效调整，保证结构的受力和变形始终处于安全的范围内，使成桥后的主梁线形与结构内力接近设计的理想状态。

Abstract: The construction control of cable-stayed bridge is an important link to ensure that the bridge reaches the ideal stress state. In this paper, the Fengyi Bridge is taken as the research object, the whole construction process is simulated and calculated, and the ideal state of each construction stage is obtained, and the stress and alignment of the cable tower, the cable force, the stress and alignment of the main beam, the atmosphere and the structural temperature are detected in real time, and the construction error state is analyzed through the comparison of the measured results and the theoretical calculation results, and the safety assessment and effective adjustment are carried out in time to ensure that the force and deformation of the structure are always within the safe range, so that the linear shape of the main beam and the internal force of the structure after the bridge is close to the ideal state of the design.