分段微差爆破技术在桥梁人工挖孔桩中的应用

Application of Manual Hole Digging Pile Millisecond Blasting Technique on Bridge Pile Foundation

桥梁灌注桩基础成孔方法一般采用人工挖孔和机械挖孔两种,在某些复杂特殊地质条件下的人工挖孔桩施工中,采用微差爆破技术具有独特优势,尤其适应缺水、缺黄粘土以及地势陡峭设备无法调运地区。本文结合吉茶高速公路团结3号桥桩基人工挖孔实践,详细阐述了浅孔分段微差爆破技术在桥梁桩基人工挖孔施工中的应用,该成果可供具有类似地质条件下的桩基施工参考。

The manual digging filling pile and machine drilling one are usually used as the bridge pile foundation.In the mountain area,the millisecond blasting technology has unique advantages under the complicated geological conditions,especially in the water shortage and lake of yellow clay condition.Combined with Ji-cha highway engineering practice,the millisecond blasting technology in the construction of manual hole digging pile is introduced in this paper.The construction experience can be served as a reference to similar projects.