一、苍溪元坝桥: 为3×60+35m,全长250m预应力钢筋混凝土桁架拱桥,桥面净7+2×0.75m,载重汽-20,挂-100。每孔二片桁架,中距5.5m,上铺预应力空心板,现浇混凝土桥面。桁架的斜杆、实腹段,桥面横向均以四级(?)25钢筋建立预应力,冷轧丝纹,螺帽锚具,用yc-60千斤顶外加自动上螺帽附加器 First, Cangxi Yuanba Bridge: 3 × 60 +35 m, full-length 250m prestressed concrete truss arch bridge, the bridge deck net 7 +2 × 0.75m, load steam -20, hang -100. Two trunks per hole, at a distance of 5.5m, pre-stressed hollow slabs, cast-in-place concrete decks. Trusses truss, the actual section, the bridge deck are transverse to the four (?) 25 steel to establish prestressed, cold-rolled silk, nut anchorage, with yc-60 jack plus automatic cap attachment