柳州红光大桥北岸锚碇逆作拱圈支护设计

Design of Arch Ring Lagging Built with Top-Down Method for North Anchorage of Hongguang Bridge in Liuzhou

柳州红光大桥北岸锚碇开挖深度达20m,紧挨坑边即为7～9层住宅楼,本工程因地制宜采用了土钉+逆作拱圈支护的方式进行支护,拱圈直径达44.4m,目前国内拱圈实例较小,将其设计过程提出以供参考。

The excavation depth of the north anchorage pit of Hongguang Bridge in Liuzhou is down to 20 m, and closely adjacent to the pit are the residential buildings of 7～9 stories. During excavation of the pit, the soil anchors plus an arch ring, 44.4 m in diameter, to be built with topdown method were selected for use in the light of the conditions available at the site. The size of the same kind of structure having been used currently elsewhere in China is fairly small. In this paper, the design process of the arch ring lagging is presented for reference.