摘要
城市临湖基坑多为软弱土层,地下水丰富,土方开挖属于危险性较大的分部分项工程,土方挖运速度直接影响深基坑施工安全和后期主体结构施工进度,设置合理的栈桥结构,不仅可减少内支撑数量,还可显著提高土方开挖与外运施工效率。以武汉市南湖北岸某超大基坑为例,该基坑采用冠梁支撑梁+格构柱+钢构造体系+加强板+混凝土桥面板组成的十字栈桥体系,加快了土方挖运速度,确保了基坑安全,实施效果良好,可供后续类似工程借鉴。
Most urban lakeside foundation pits are soft soil layers with abundant groundwater.Earth excavation is a dangerous divisional and subdivisional project.The speed of earth excavation and transportation directly affects the construction safety of deep foundation pit and the construction progress of later main structure.Setting a reasonable trestle structure can not only reduce the number of internal supports,but also significantly improve the efficiency of earth excavation and outward transportation.Taking a super large foundation pit on the North Bank of Nanhu in Wuhan as an example,the foundation pit adopts a cross trestle system composed of crown beam support beam+lattice column+steel structure system+reinforcing plate+concrete bridge deck,which speeds up the speed of earthwork excavation and transportation,ensures the safety of the foundation pit,and has a good implementation effect,which can be used as a reference for subsequent similar projects.
作者
吕远
LYU Yuan(Wuhan Municipal Construction Group Co.,Ltd.,Wuhan,Hubei,430000,China)
关键词
临湖
基坑
土方挖运
支撑
栈桥
near the lake
foundation pit
earth excavation and transportation
support
trestle
