预应力混凝土转体T形刚构桥施工监控

Control of Rotation Construction for Prestressed Concrete T-shaped Rigid Frame Bridges

研究目的:转体T构桥梁在施工过程中的受力和变形情况复杂,尽管在设计时已经考虑施工中可能出现的情况,但是实际施工中出现的诸多因素事先难以精确估计,因此有必要对施工过程进行实时监控。本文以石家庄某桥梁为例,通过在施工中对桥梁结构进行实时监测及施工模拟分析,以达到结构的变形、内力及线形符合设计要求的目的;同时收集相关数据,以期为同类结构的施工提供可借鉴的资料。研究结论:(1)通过合理的监控方案实施,将基于Midas civil软件计算的理论值与现场实测值进行对比分析后,可得知主梁标高与预测标高偏差很小,在施工过程中主梁控制截面测点应力均满足规范要求,主桥线形流畅,预拱度设置合理;(2)转体称配重试验提供的参数也确保了桥梁转体施工的安全;(3)现场采集到的相关数据可作为桥梁运营期间技术管理和技术评估的依据;(4)本研究结论可为类似转体桥梁的设计与施工提供参考。

Research purposes： During the rotation construction process for T - shaped rigid frame bridges, stress and deformation of bridges is a complex condition. Many factors of the construction are difficult to accurately estimate in advance, although the most possible situation has been considered by designer, so it is necessory to monitor the construction process in real time. This paper takes the bridge in Shijiazhuang city as an example. In the construction process, the bridge structure is controlled in real time, and the control parameters are adjusted according to the control results, in order to make the deformation, internal force and linear shape of the structure meet the design requirements. Relevant data are collected to provide reference for the construction of similar structure. Research conclusions： （ 1 ） Through implementation of the reasonable control program, the theoretical values based on calculation of Midas civil software are compared with the measured values, we can see that the main beam elevation is closed to the predicted elevation, the key section stress of the main beam meet the specification requirements in the construction process, the bridge has a smooth linearity and reasonable pre -camber. （2） The parameters provided by test of weighing and bob -weight also ensure the safety of the bridge rotation construction. （3） The relevant data collected at the site can be used as the basis for technical management and technical evaluation during the operation of the bridge. （4） The research results can provide references for the design and construction of similar bridges.