深基坑提前拆除钢筋混凝土支撑后的稳定性检算

Check on Stability of Deep Foundation Pit after the Reinforced Concrete Support Removed in Advance

支撑体系是深基坑施工过程中安全性的必要保证,而作为临时结构的支撑,当施工进展到一定阶段后,将对主体结构顶部钢筋混凝土施工存在干扰,需要拆除支撑结构才有利于展开施工。主要介绍青岛北客站地铁站深基坑顶部钢筋混凝土支撑拆除的两种计算方式,分理论计算和根据现场实测值计算。两种计算方法的分析结果表明,基坑稳定性都满足要求。该站采用对钢筋混凝土支撑"隔一拆一"的施工方案,改善了操作空间,保证了施工质量。

Support system is necessary security for construction of deep foundation pit; however, as the support of temporary structures, when the construction enters into certain phase, it would be removed in favor of the construction due to the interference in the reinforced concrete construction on top of the main structure. This paper introduces two methods calculating removal of the reinforced concrete support on top of the deep foundation pit in the metro station at North Qingdao Passenger Station based on theoretical rationale and on-site measured value. The results of calculation analysis show that the stability of the deep foundation pit meets the requirement and the construction scheme of ＂ removing one support at one support interval＂ improves the operating space and ensures the construction quality.