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一、工程概况 北京地铁永安里一大北窑区间隧道全长576.4m,在里程B242+71.37位置设双层区间通风道一座。通风道拱顶距地面7.2m,其地面为繁华的建外大街,施工时由南向北横穿建外大街与区间隧道相接。通风道暗挖结构断面为拱型双层结构,总长61.243m,结构外宽6.58m,全高11.29m,风道内泵房是本段区间隧道的最低点。该部位总高13.74m。区间风道端部设施工竖井,地面以上将续建通风塔楼。详见图1《区间风道平面布置图》
I. Project Overview A total length of 576.4m tunnels of a large northern kiln in the Yong’anli subway in Beijing is provided with a double section air duct at a distance of B242 + 71.37. Ventilation tunnel roof 7.2m from the ground, the ground for the bustling Jianwai Avenue, construction from south to north across the Avenue built outside the tunnel with the tunnel. Ventilation channel undercut structure section arch double structure, total length 61.243m, structure width 6.58m, full-height 11.29m, duct in the tunnel is the lowest point of this section of the tunnel. The total height of the site 13.74m. The end of the section of the air duct facilities shaft, ground above the ventilation tower will be built. See Figure 1 “Interval duct layout plan”