旋挖两次成孔大直径钢筋混凝土灌注桩施工

Construction technology of large-diameter steel reinforced concrete bored pile with rotary drilling and second time well completion method

简述了旋挖钻机两次成孔的工艺原理,从施工测量、钢筋笼制作、灌注施工、成桩等方面,介绍了旋挖两次成孔大直径钢筋混凝土灌注桩施工的操作要点,并阐明了施工中关键材料的选用原则,指出旋挖钻机两次成孔工艺降低了钻进阻力,加快了钻进速度,应用前景十分广阔。

With a brief introduction of technological principles of rotary drilling and second time well completion method,starting from aspects of construction measurement,steel reinforcement cage fabrication,casting construction and pile forming,the paper introduces the construction operation points of large-diameter steel reinforced concrete bored pile with rotary drilling and second time well completion method,illustrates its critical materials selecting principles in construction,and finally points out that： rotary drilling and second time well completion technology reduces drilling resistance,and speeds up drilling speed. Therefore,it has wide application prospect.