对钻孔灌注桩进行抽芯检验时，可能因钻头切断钢筋而使桩基承载力下降甚至整根桩报废。本文提出的方法可对钻头遇到钢筋的孔内工况进行自动识别，声光报警，并给出遇钢筋的深度，以防切断钢筋。文中还介绍了判断钢筋笼歪斜情况的简易方法。 In the core-pulling inspection of bored piles, the bearing capacity of the pile may be reduced or the whole pile may be scrapped due to cutting of the steel by the drill bit. The method proposed in this paper can automatically recognize the working conditions in the hole where the drill bit meets the steel bar, sound and light alarm, and give the depth of the steel, to prevent cutting steel bar. The article also introduced a simple method for judging the skewness of steel cages.