深基坑拉锚式围护结构的优化设计及工程应用

The Optimum Design and Engineering Application of the Pulling and Arching Supporting Structure in Deep Foundation Pit Projects

深基坑拉锚式围护结构由于其经济可靠而且施工快速简便 ,已经在许多深基坑工程得到了迅速推广应用。本文结合北京站扩能改造深基坑工程实例 ,通过分析工程场地周边环境与工程地质条件 ,经方案比较后 ,采用拉锚式围护方案 ,着重阐述了拉锚式支护方案设计与施工要点。工程实施效果及技术经济评价表明 ,该方案有效地保证了基坑施工期间的安全与稳定 ,且经济效益十分明显 ,拉锚式围护体系在该工程中显示了其独特的优势。

The pulling and arching supporting structure in deep foundation pit has been used widely in many deep foundation pit projects due to its economy, reliability, speed and simplicity. Based on the character of the engineering geological condition and surrounding of the Beijing Metro enlarging project, the pulling and arching supporting structure was designed for it. This paper expounds the design scheme and construction techniques in a detailed way. The project practice and technical and economical appraisals indicate that the design scheme is feasible and economical as well and that this structure can ensure the safety and stability in deep foundation pit projects with its unique advantage.