排桩+斜撑组合支撑系统的换撑技术研究

Support replacement technology of bracing system with oblique bracing + piles in row

排桩斜支撑的组合支护结构用于深基坑大面积开挖时,有明显的优越性,但是由于有关斜撑拆除的研究相对滞后,使该支撑形式的推广受到一定的限制。结合具体工程实例,从设计和施工的角度研究该类支护形式的拆撑方法及换撑过程中的内力转移及变形问题,并通过实测加以验证,发现该类斜撑的拆除,须借助支撑系统的空间协调作用,利用协同计算的方法,进行分区分段拆除,并得出了一些有意义的结论,可以为今后该类支护形式的拆撑设计和施工提供依据和借鉴。

The bracing system with piles and oblique bracing has obvious advantages in excavation of large and deep foundation pits.Since the studies on removal of oblique bracing are rare,the use of this system is limited.The transfer of internal forces and deformation issues in the process of exchanging support is studied through an example from the design and construction,and the results will be verified through the measurement.The results show that the removal of such bracing shall tack the coordinating role of space in account,and use the collaborative computing method to remove the obligue bracing in several subregions and sections.Some conclusions are drawn,and they can provide reference for the design and construction of similar projects.