旋挖钻机成孔灌注桩技术在龙青高速公路中的应用

摘要

旋挖钻成孔核心技术为通过旋挖钻底部带有活门的桶式钻头，利用钻杆的扭矩力将钻头压入土体回转破碎岩土，并将其装入钻头内，提出孔外卸土，往复循环达到成孔目的。%The core technology of rotary drilling is using drill pipe rotary torque force to press the barrel drill which is located on the bottom of the rotary drilling and with a valve into the rock and soil , and then rotate the drilling to break the rock and soil , make the barrel full with fragments ,then pull the drill out to pour them out , repeat several times until the hole forming .