狭小场地条件下地下连续墙桩式配筋设计与应用研究

Design and Application of Pile-Style Reinforcement for Underground Diaphragm Wall under Narrow Site Condition

为克服狭小场地条件下地下连续墙钢筋笼施工困难的问题,提出一种新型地下连续墙配筋形式,并将其命名为“桩式墙”。首先,通过公式推导对桩式墙进行设计;然后,对其施工过程进行数值模拟,并将数值模拟结果与监测结果进行对比分析;最后,形成桩式墙结构的设计方法,并以抗弯性能为切入点对比桩式墙结构、传统地下连续墙结构及支护桩结构的优缺点。研究结果表明:与传统地下连续墙结构相比,同等情况下应用桩式墙结构需使用1.27~1.58倍的纵向钢筋,但可使施工期间的灵活性大幅提升,可在狭小或复杂场地深基坑围护结构设计与施工中应用。

To realize reinforcing cage construction of underground diaphragm in narrow and complex construction site,a new type of underground diaphragm wall reinforcement is put forward,which is named as pile-wall.In this paper,the formula of the pile-wall design method is deduced,the construction process is simulated and compared with the monitoring results.Finally,the design method of pile-wall structure is formed,and the advantages and disadvantages of pile-type wall structure,traditional underground diaphragm structure,and shelter pile structure are comparatively analyzed in terms of bending capacity.The results show that compared with the traditional underground diaphragm structure,the pile-wall structure needs 1.27~1.58 times of steel bars,which ensures a significant improvement in flexibility during construction and provides guidance and reference for the design and construction of deep foundation pit retaining structure in narrow or complex sites.