摘要
沪通长江大桥主航道桥为(140+462+1 092+462+140)m双塔连续钢桁梁斜拉桥,桥墩均采用沉井基础,其中下部钢沉井采用船坞内制造,整体出坞、浮运至墩位处的施工方案。浮态钢沉井最大锚泊力为6 940kN,锚泊系统采用大直径钢桩锚碇系统,该锚碇系统由主锚碇、边锚碇、钢缆绳等组成。边锚碇为钢筋混凝土结构,单重约900t,在桥址附近的船厂内预制,用1 800t浮吊起吊装船,4 000t驳船运输。采用1 000t(1 300t)浮吊吊起边锚碇后,通过绞锚移船,调整浮吊船位和船身的扭角来使边锚碇锚位和棘爪方向满足要求,浮吊松主钩,将边锚碇放到河床上,150t浮吊在水面上摘钩。抛设8只边锚碇共用时7d。
The main navigational bridge of Hutong Changjiang River Bridge is a two-pylon continuous steel truss girder cable-stayed bridge with span arrangement of（140＋462＋1 092＋462＋140）m.Lower parts of the steel caissons that serve as pier foundations were fabricated in the dock,moved out of the dock monolithically and floated to the pier sites.The buoyant steel caisson demands an anchoring force of 6 940 k N.The anchoring system adopts the large-diameter steel pile anchorage scheme,the predominant components of which include the main and side anchor blocks and steel ropes.The side anchor block weighing about 900 tis a reinforced concrete structure,prefabricated in the shipyard near the bridge site,hoisted and lowered to the boat by the floating crane with a capacity of 1 800 t and transported by the tugboats of 4 000 t capacity.The floating crane with a capacity of 1 000t（1 300t） was used to hoist the side anchor block,then the twist anchor was used to move the boats and adjust the position of the floating crane and the twisting angle of the boat to make the mooring position of the anchor block and the direction of the pawls meet the requirements.Then the main hooks of the 150 t floating crane were loosed to lower the anchor block to the river bed,and the hooks were removed over the river.The mooring of all the eight side anchor blocks took seven hours.
出处
《世界桥梁》
北大核心
2016年第4期30-34,共5页
World Bridges
关键词
公路铁路两用桥
斜拉桥
钢沉井
锚碇系统
边锚碇
施工
rail-cum-road bridge
cable-stayed bridge
steel caisson
anchoring system
side anchor block
construction
