大跨度预应力混凝土刚构-连续梁桥悬臂施工工艺研究

东明黄河公路大桥全长4142.14m,其中,主桥为大跨度预应力混凝土刚构-连续梁组合体系,1联长990m,箱梁跨度为120m.该桥具有规模大、施工技术复杂和难度高等特点,为了保证该桥梁的顺利施工,本文给出了桥梁悬臂施工工艺,按照该工艺进行施工,实现了桥梁跨度120m无强迫合拢,合拢高程误差仅3mm,桥轴线误差仅5mm,箱梁悬浇施工周期平均为6d,做到了高速度、高精度、安全施工.本文所给出的主桥上部箱梁悬臂浇注工艺可为其它类似桥梁的施工提供参考.

Study on Cantilever Construction Technology in Long Span Prestressed Concrete Rigid Continuous Compound System Bridge

The full-length of Dongming Yellow River Highway Bridge is 4142.14m.In the meanwhile,the main bridge is a long span prestressed concrete rigid continuous compound system bridge.One long unit of the bridge is 990m and the span of the box beam is 120m.It has particular features such as large scale,complex construction and difficulty.In order to construct the bridge,cantilever construction technology and the main skill craft of the long span prestressed concrete rigid continuous compound system bridge have been given.Following the construction technology,no compulsive folding in 120m of the bridge,altitude error of the folding only 3mm and axial line error only 5mm have been realized.And the cantilever construction cyclic of the box beam is only 6 days.High speed,high precision and safe construction have been achieved.In a word,the cantilever construction technology of the box beam can offer the related data to such bridge's construction.