采用后支点挂篮施工的双边箱主梁混凝土斜拉桥设计

Design of Double Side-box Main-beam Concrete Cable-stayed Bridge Constructed by Rear-fulcrum Form Traveler

某大桥主桥是一座主跨250 m的三跨双塔双索面斜拉桥,采用预应力混凝土双边箱主梁形式,桥面宽36.5 m,采用后支点挂篮悬浇施工,与国内常规的采用前支点挂篮悬浇施工的双边箱混凝土斜拉桥不同,后支点挂篮施工可减少斜拉索索力调整次数,施工监控难度较低,且能有效节省施工工期。结合施工单位的施工机具选择不同的施工方案,可节约工程造价。

A main bridge is a three-span double-pylon double-plane cable-stayed bridge with a main 250-m span.The pre-stressed concrete double side-box main-beam form is used.Its deck is 36.5 m wide.The rear-fulcrum form traveler cantilever pouring method is used in its construction.Different from the double side-box concrete cable-stayed bridges constructed by the front-fulcrum form traveler cantilever pouring method conventionally in China,the rear-fulcrum form traveler construction method can decrease the adjustment times of stayed cable force,the control difficulty of construction is lower and the construction period can be effectively saved.Combined with the construction equipment of construction unit,the selection of the different construction schemes can save the engineering cost.