近年来，我国大中桥基础普遍采用钻孔灌注桩．对穿越细砂层的嵌岩桩，目前国内最有效的作法是用钢管桩、预应力混凝土管桩或用钢（混凝土）护简穿越软弱松散层，然后钻孔成桩．黄石长江公路大桥北引桥基础，在松散深覆盖的地质条件下设置浅护筒，用反循环钻机、冲击锥和上钻下冲三种方法造孔，完成了预期任务。 In recent years, the foundation of Dazhong Bridge in our country generally use bored piles. At present, the most effective method for socketed piles crossing the fine sand layer is to use steel pipe piles, prestressed concrete pipe piles or steel (concrete) piles to penetrate the soft and loose layers and then drill into piles. Huangshi Yangtze River Bridge North Approach Bridge foundation, the shallow depth of cover in the setting of shallow shell under the geological conditions, with reverse circulation drilling machine, impact cone and downhole drilling three ways to make a hole, to complete the desired task.