漂、卵石层大直径钻孔碎岩技术应用研究

Fragmentation Technique of Large Diameter Drilling for the Large Floating Rock and Screed Stratum

结合长春市某桥梁钻孔灌注桩基础施工实例,介绍了大漂石和卵石地层的筒钻法钻进原理、潜孔锤钻进工艺、岩心聚能爆破工艺、以及筒钻回转切石工艺等。工程实践表明,筒钻法对大漂石和卵石地层钻进成孔是非常有效的,这为该类地层的顺利成孔积累了成功的经验。

Taking bored pile construction of bridge engineering in Changchun as a sample, uns paper introduces the drilling principle, down - the - hole hammer drilling technique, shaped - charge explosion technology and cutting rock technology about tubular drill. Engineering practice shows that tubular drill is a high efficient drilling method, which has accumulated experience on all right drilling hole for the large floating rock and screed stratum.