拱架现浇钢筋混凝土拱圈浇筑方案优化

Optimization of Pouring Scheme of Cast-in-place Reinforced Concrete Arch Ring

钢筋混凝土拱桥以其优美的造型及良好的受力特性广泛应用于山区桥梁工程中,拱架现浇法是山区拱桥常用的一种施工方法。拱圈浇筑程序的不同,影响着拱圈及拱架的受力和变形情况,以川坝大桥为背景工程,对钢筋混凝土拱圈浇筑方案进行了优化,并采用有限元软件对整个浇筑过程进行计算模拟,结果表明:拱圈浇筑方案优化后,使得拱架变形均匀,内力状态接近于拱圈满布荷载作用下工况,拱架弦杆始终受压,未出现拉应力,保证拱架不出现非弹性变形;浇筑过程中拱圈混凝土拉应力亦满足规范要求,可保证拱架及拱圈在浇筑过程中的安全性。

Reinforced concrete arch bridge is widely used in mountain bridge engineering because of its beautiful shape and good mechanical characteristics.Arch frame cast-in-place method is a common construction method for mountain arch bridge.The different pouring procedures of arch ring affect the stress and deformation of arch ring and arch frame.This paper takes Chuanba Bridge as the background project,optimizes the pouring scheme of reinforced concrete arch ring,and uses finite element software to calculate and simulate the whole pouring process.The results show that after the optimization of arch ring pouring scheme,the deformation of arch frame is uniform,and the internal force state is close to the working condition under the full load of arch ring.The chord of arch frame is always under pressure,and there is no tensile stress,so as to ensure that the arch frame does not have inelastic deformation.The tensile stress of the arch ring concrete during the pouring process also meets the requirements of the specification,which can ensure the safety of the arch frame and the arch ring during the pouring process.