多跨连续-刚构桥梁施工的高程及应力控制——以新疆克其克苏布台大桥为例

为实现桥梁施工精度的准确控制,保证桥梁施工质量符合设计要求,对某多跨连续-刚构桥梁的施工控制进行了计算分析。首先,通过理论计算桥梁的预拱度,并在施工过程中采取相应的高程及应力控制措施;其次,通过现场实测,对施工过程中的高程及应力进行实时监测,将监测值与控制值进行比较,以评价控制效果。实例检验结果表明:在高程控制方面,最终合龙高程误差不超过8mm,满足了桥梁的线型要求;在应力控制方面,主梁和墩身应力均为压应力,且远小于规范限值,满足设计要求。因此,在桥梁施工过程中,通过理论计算与施工控制相结合的方法,能够实现桥梁高程及应力的有效控制,达到预期效果。桥梁施工控制措施的有效性在研究中得到了验证,可为类似桥梁施工提供参考。

Elevation and stress control of multi span continuous rigid frame bridge construction: Taking Xinjiang Keqike Subu bridge as example

In order to realize the accurate control of bridge construction accuracy and ensure the quality of bridge construction complying with the design requirements, the construction control of a multi span continuous rigid frame bridge is calculated and analyzed. First of all, the bridge camber is calculated through theoretical calculation, and corresponding control measures for elevation and stress in construction process is adopted; secondly, through field test, real-time monitoring of the elevation and stress is conducted in the construction process, and the monitoring value and control value are compared, so as to evaluate the control effect. The results show that, in the elevation control, final closure height error is less than 8 mm, which meets the linetype requirements of the bridge; in stress control, the main girder stress and the pier stress are all compressive stress, which are far less than the specification limits and meet the design requirements. So in the process of bridge construction, by combining the theoretical calculation and the construction control, effective control of stress and the elevation of the bridge can be achieved, namely the desired effect can be achieved. The effectiveness of the suggested bridge construction control measures is verified which provides a reference for the construction of similar bridges.