A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention discloses a cable-stayed bridge steel box girder pushing construction method which comprises the following steps: determining a bottom plate design vertical curve of a steel box girder at a mounting position according to a design drawing; carrying out pre-camber superposition to obtain a theoretical assembling curve of the steel box girder bottom plate at the mounting position and thus establishing a pushing curve with the minimum replacement workload of the steel box girder cushion block to serve as a field bottom plate actual splicing curve; and then, carrying out segmented splicing and pushing on the steel box girder atone end of the bridge, and keeping a supporting point at the top of pushing equipment jack or the top of a bearing girder to be attached to the bottom of the steel box girder all the time by ascending the pushing equipment jack or adding a cushion block above the bearing girder. And the steel box girder is completely pushed to a position above the mounting position. And the steel box girder is integrally dropped onto the permanent support of the pier by adopting a replacement method to finish the pushing construction of the steel box girder. According to the cable-stayed bridge steel box girder pushing construction method with the bottom plate being the vertical curve, the application range of steel box girder pushing is enlarged, stress is evenin the steel box girder pushing process, structural deformation damage is avoided, and construction is safe and reliable.
本发明公开了一种斜拉桥钢箱梁顶推施工方法，首先，根据设计图纸确定钢箱梁在安装位置处的底板设计竖曲线；叠加预拱度，得到安装位置处的钢箱梁底板理论拼装曲线，以此建立钢箱梁垫块更换工作量最小的顶推曲线，作为现场底板实际拼装曲线，然后，钢箱梁在桥梁一端分段拼装和顶推，通过顶推设备千斤顶上升或在垫梁上方增加垫块来保持顶推设备千斤顶顶部支撑点或垫梁顶部始终与钢箱梁底贴合。钢箱梁全部顶推到安装位置上方。采用“置换法”将钢箱梁整体落梁到桥墩的永久支座上，完成钢箱梁的顶推施工。该方案对底板为竖曲线的斜拉桥钢箱梁顶推施工方法扩大了钢箱梁顶推的应用范围，钢箱梁顶推过程中受力均匀，不发生结构变形破坏，施工安全可靠。
The invention discloses a cable-stayed bridge steel box girder pushing construction method which comprises the following steps: determining a bottom plate design vertical curve of a steel box girder at a mounting position according to a design drawing; carrying out pre-camber superposition to obtain a theoretical assembling curve of the steel box girder bottom plate at the mounting position and thus establishing a pushing curve with the minimum replacement workload of the steel box girder cushion block to serve as a field bottom plate actual splicing curve; and then, carrying out segmented splicing and pushing on the steel box girder atone end of the bridge, and keeping a supporting point at the top of pushing equipment jack or the top of a bearing girder to be attached to the bottom of the steel box girder all the time by ascending the pushing equipment jack or adding a cushion block above the bearing girder. And the steel box girder is completely pushed to a position above the mounting position. And the steel box girder is integrally dropped onto the permanent support of the pier by adopting a replacement method to finish the pushing construction of the steel box girder. According to the cable-stayed bridge steel box girder pushing construction method with the bottom plate being the vertical curve, the application range of steel box girder pushing is enlarged, stress is evenin the steel box girder pushing process, structural deformation damage is avoided, and construction is safe and reliable.
本发明公开了一种斜拉桥钢箱梁顶推施工方法，首先，根据设计图纸确定钢箱梁在安装位置处的底板设计竖曲线；叠加预拱度，得到安装位置处的钢箱梁底板理论拼装曲线，以此建立钢箱梁垫块更换工作量最小的顶推曲线，作为现场底板实际拼装曲线，然后，钢箱梁在桥梁一端分段拼装和顶推，通过顶推设备千斤顶上升或在垫梁上方增加垫块来保持顶推设备千斤顶顶部支撑点或垫梁顶部始终与钢箱梁底贴合。钢箱梁全部顶推到安装位置上方。采用“置换法”将钢箱梁整体落梁到桥墩的永久支座上，完成钢箱梁的顶推施工。该方案对底板为竖曲线的斜拉桥钢箱梁顶推施工方法扩大了钢箱梁顶推的应用范围，钢箱梁顶推过程中受力均匀，不发生结构变形破坏，施工安全可靠。
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