深基坑冠梁支护竖向位移水准观测方法优化

Optimization of Horizontal Observation Method for Vertical Displacement of Crown Beam Support in Deep Foundation Pit

精密水准测量目前仍然是基坑在施工环境下进行冠梁竖向位移观测的主要方法之一。但城市中大型深基坑工程监测点间距小、监测频率高,常规水准观测方法易造成路线增长、测站增多从而造成累积误差增大、效率反而降低的情况。基于冠梁点位水准路线特点并结合误差传播规律,分析出在不影响监测精度的情况下,采用直接上点法优化观测路线能大幅提升观测效率的结论,适用于基坑监测工程。

At present,the precise leveling is still one of the main methods to observe the vertical displacement of crown beam in the construction environment of foundation pit.However,due to the small distance between monitoring points and high monitoring frequency of large and medium-sized deep foundation pit projects in cities,the conventional leveling observation method is easy to cause the increase of route and stations,resulting in the increase of cumulative error and the decrease of efficiency.According to the characteristics of the leveling route of the crown beam point and the law of error propagation,it is concluded that without affecting the monitoring accuracy,using the direct up point method to improve the observation route can greatly improve the observation efficiency,which is suitable for foundation pit monitoring engineering.