Monitoring study on anchor tension of deep excavation engineering of Wangjing A1-C-4 Project
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摘要: 在北京地区深基坑工程是比较常见的,目前深基坑工程相关的监测和理论研究不太成熟。通过对望京A1区C组团#4地项目基坑支护工程中锚杆拉力的监测研究可知：本工程极具特点,两排锚杆的拉力变化趋势截然相反,在一定程度上反映出现行规范的不尽详细之处,也反映了基坑工程较强的地域特点;工程中应加入桩身位移监测,即保证工程安全,又提供详细数据进行设计优化和减少少造价、工期;建议今后有新进场施工的张拉机具时,先采用锚杆轴力计对其锁定时的预应力损失进行量化,并以此为依据适当优化施工参数;由此可知目前的基坑工程存在很大的优化空间。研究结论也可为类似工程设计提供参考和依据。Abstract: Deep-excavated foundation engineering is common in Beijing area, while the related monitoring and theoretical researches are not quite sound. Through the monitoring and researches on pulling force of bolts in the supporting project of foundation pit at Land No. 4 Group C, Wangjing A1 District, it is deducible that the project is quite distinctive as the change tendency of pulling force of the two lines of bolts are opposite. It is reflected by the incompleteness of the current regulations and the strong geographical characteristics of excavation projects. The displacement monitoring of piles should be introduced into the project so to ensure its safety and to provide detailed data for its design optimization and cost reduction. It’s recommended that when the pulling machines in construction are available, axial force meters of bolts should be used firstly to quantify the pre-stressing loss locked so as to optimize the construction parameters properly in accordance. Therefore, it follows that there exists vast room for the optimization for the current excavated foundation engineering. The research results may provide reference and foundation for similar engineering design.
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Keywords:
- deep excavation engineering /
- pile-anchor support /
- anchor tension /
- monitoring study
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