超大直径岩石桩水钻取芯成孔的施工技术

OA251悬灌桥施工为一援外项目，位于阿尔及利亚某地山脉峡谷处，地质多变、地形复杂、施工场地狭小，且受铁路、公路限制不能实施爆破。根据实际情况且考虑工期和成本的因素，在超大直径嵌岩桩基施工中，选取了人工挖孔、水钻法施工的方法，取得了巨大的成功，为在地形条件差、岩石坚硬的地区施工大直径桩基提供了很好的技术参考。

Construction Method of Coring for Pore Water Drilling of Super-diameter Forming Based on Rock Pile

OA251 cordillera tion field of Algeria, is narrow, cantilever casting bridge is a foreign where the geological condition is mutable, and the blasting can not be implemented aid project. It is located in some the terrain is complex, the construcdue to the limitation of railway and highway. According to practical condition and considering the construction period and cost, manual pore digging and water drilling method are adopted in super-diameter rock-socketed loose foundation construction. The practice is greatly successful, which provides perfect technical reference for the super-diameter pile foundation construction in the areas with bad terrain condition and stiff rock.