“先梁后拱”方法在南门关大桥中的应用分析

Analysis on Application of "Pre-beam and Post-arch" Method in Nanmenguan Bridge

近些年,钢管混凝土拱桥作为一种重要桥型,在现代桥梁建设事业中得到了广泛应用,其中下承式钢管混凝土拱桥尤其适用于不良地质。南关门大桥桥址区不良地质现象为泥石流和左岸冰水堆积体被泥石流冲刷坡脚后产生局部的塌方,经综合考虑决定采用下承式钢管混凝土简支系杆拱桥,并具体分析了"先梁后拱"的施工方法,可供参考。

In recent years, the concrete-filled steel tube arch bridge is an important bridge, and is widely used in the construction of modern bridge, in which the through concrete-filled steel tube arch bridge is especially suitable for the poor geology. The poor geological phenomenon at the location of Nanmenguan Bridge is the local collapse caused by the debris flow and left shore ice water accumulation body after the debris flow washes the foot of slope. The comprehensive consideration determines to use the through concrete-filled steel tube simple-supported bowstring arch bridge. The "per-beam and post-arch" construction method is analyzed in detail for reference.