在类刚性大直径水泥土旋搅桩中,制作混凝土灌注桩作为一种新型支护结构已率先在广州软土地区得到成功应用。以广东南沙区建滔广场基坑工程为实例,介绍了砼芯类刚性大直径水泥土旋搅桩组合支护体系的设计方法,一季宽大冠梁,环板撑栈桥内支撑体系的设计经验。结果表明:此种体系的支护设计方案能较好地控制基坑变形,有利于土方开挖外运及塔楼结构施工,具有施工工期和成本上的优越性,为软土地区基坑工程设计提供了相关参考和工程经验。 In the type of rigid large diameter cement soil rotary pile, the production of concrete piles as a new type of support structure has taken the lead in Guangzhou soft soil area has been successfully applied. Taking the construction of foundation pit in Kingtao Square, Nansha District, Guangdong as an example, the design method of combined support system of rotary grouted pile with large diameter concrete and reinforced concrete with large diameter concrete core is introduced. The results show that the support design of this system can control the deformation of the foundation pit well, facilitate the earthwork excavation and the construction of the tower structure, and has the advantages of construction duration and cost, and provides the foundation pit engineering design for the soft soil area Provided relevant reference and engineering experience.