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某公铁两用大桥是双塔双索面钢桁梁斜拉桥,2号桥塔墩钻孔施工桩附近的地质情况较为复杂,具有岩面倾斜裸露、岩层软硬不均,基岩裂隙发育等特点,在钻孔施工中开孔采用冲击钻,之后钢护筒及时地跟进,最后成孔运用气举反循环钻机,这一系列方式的配合实现了钻孔桩每天成孔速度为2米;再加上钢筋笼、整体吊装、导管预拼接、整体吊住、储料斗方法灌注等一系列的成桩工艺,深水钻孔桩施工速度飞快,平均每4天就能够成一根桩。某公铁两用大桥的实际施工应用说明了钻孔桩快速施工方法的可行性。
A certain type of railway bridge is a double-tower double-cable face steel truss cable-stayed bridge. The geological conditions near the pier 2 of the tower pier in No. 2 bridge are complex. There are slopes exposed, uneven rock and soft, Development and other characteristics of the hole in the drilling construction using impact drill, and then follow up the steel casing in a timely manner, the final hole using air lift reverse circulation drilling rig, this series of ways to achieve a daily rate of drilling piles into 2 meters; Coupled with a series of pile-forming techniques such as steel cage, integral hoisting, pre-splicing of pipelines, overall hanging, and method of storing hopper, deep-water drilling pile construction is fast and can form an average pile every 4 days. The practical application of a railway bridge shows the feasibility of the rapid construction method of bored pile.