富水砂层地区地下连续墙套铣接头与工字钢接头工艺对比分析  

Comparative Analysis of Sleeve Milling and I-Steel Beam Joints Methods in Diaphragm Wall Installation in Saturated Sandy Layers

作　　者：黄书行 HUANG Shuhang(CCCC First Highway Engineering Group Co.Ltd.,Beijing 100024)

机构地区：[1]中交一公局集团有限公司,北京100024

出　　处：《土工基础》2023年第3期354-357,共4页Soil Engineering and Foundation

摘　　要：广州市轨道交通十二号线南航新村站位于广州市白云区,为地下两层岛式车站,长185.4m,开挖深度为19.7~22.2m。地层以富水砂层和强风化粉砂质泥岩为主,地层内存在断裂带、岩溶发育,因此对围护结构的施工要求较高。南航新村站采用地连墙+内支撑的支护体系,西侧基坑采用工字钢接头形式,东侧基坑的连续墙在施工期间由工字钢接头变更为套铣接头。通过对比西侧基坑地下连续墙的工字钢接头形式和东侧基坑地下连续墙的套铣接头形式,发现套铣接头工艺更适用于富水砂层地质,并且套铣接头工艺有着施工难度低、经济性高、止水效果好的优点。套铣接头比工字钢接头更适用于渗漏要求高的深基坑工程,在富水砂层地区,宜优先选用套铣接头。The Nanhang Xincun Station of Guangzhou rail transit Line No.12is in Baiyun District,Guangzhou.The subsurface condition is mainly composed of saturated sandy layers and strongly weathered silty mudstone.There are fault zones,and the karst formations are well-developed,so there are strong requirements for the construction of the supporting structure.The support system of diaphragm wall plus internal support is adopted for the deep excavation project.By comparing the I-steel joint form of the west foundation pit diaphragm wall and the sleeve milling joint form of the east foundation pit diaphragm wall,it is found that the sleeve milling joint process is more suitable for the geology of the saturated sandy layers,and the sleeve milling joint process has the advantages of low construction difficulty,more cost effective and a good waterproof effect.

关 键 词：富水砂层 地下连续墙 套铣接头 工字钢接头 对比分析 

分 类 号：TU476[建筑科学—结构工程]