武汉罗家港互通主桥总体设计

武汉罗家港互通主桥采用85 m下承式简支桁架拱，为双向6车道城市桥梁。桁架拱桥横向布置2片拱肋，间距29.4 m，拱肋矢高16.9 m，矢跨比为1/6；拱肋、系杆及腹杆均采用带板式加劲肋的焊接箱型截面，拱肋间设置3道箱型截面风撑；桥面系采用密布横梁的正交异性板；桥墩采用m型门式墩，基础采用钻孔灌注桩群桩；拱桥采用支架拼装、顶推施工。

Overall Design of Main Bridge of Luojiagang Interchange in Wuhan

The main bridge of Wuhan Luojiagang Interchange is a double-way six-lane urban bridge with the 85-m through simple-support truss arch. Two arch ribs are arranged horizontally, the spacing is 29.4 m, the rise of arch rib is 16.9 m and a rise span ratio is 1/6. Arch ribs, tie bars and web members adopt the welded box sections with plate-type stiffening ribs, and three box section wind braces are set between arch ribs. The bridge deck system adopts the orthotropic slabs with dense beams. The pier is m-type portal pier, and the foundation is constructed of cast-in-situ bored pile group. The arch bridge is constructed by support assembly and incremental launching method.