今年4月,我省参加交通部召开的钻孔灌注桩技术鉴定会议以后,厅领导对此新工艺极为重视,认为在我省有很大发展前途,必须认真学习推广。马上组成了设计、科研,施工三结合小组,确定进行试点。现将试点工作情况和初步体会介绍如下: 一、操作方法钻孔灌注桩的直径60厘米,桩长17米,钢筋骨架长13米。主要的设备规格和操作方法是:护筒直径70厘米,高1.0～1.5米两种;常用锥头为内黄锥,钻杆用直径为75毫米、壁厚为8毫米的无缝钢管制成的, In April this year, after the province participated in the technical appraisal meeting for bored piles held by the Ministry of Communications, the leadership of the department attaches great importance to this new technology and believes that there is a great future for development in our province. We must conscientiously study and promote it. Immediately formed a design, research, construction three combined group, to determine the pilot. Now the pilot work and the initial experience described below: First, the method of operation Bored pile diameter of 60 cm, pile length of 17 meters, 13 meters long steel skeleton. The main equipment specifications and methods of operation are: Shell diameter 70 cm, 1.0 to 1.5 meters high two; commonly used conical head for the inner cone, drill pipe diameter of 75 mm, wall thickness of 8 mm made of seamless steel pipe of,