Auxiliary tool for construction of cast-in-place concrete pile foundation

The auxiliary tool comprises a spiral drill bit, a water pipe is arranged in the spiral drill bit, one end of the water pipe is connected with a water tank, the other end of the water pipe is connected with a spray head, and the horizontal height of the spray head is slightly larger than that of the end of the drill bit. By means of the device, water can be sprayed through the spray head while drilling is conducted, a layer of protective film is formed in a hole, geological collapse can be effectively prevented from being formed in the drilled hole, and the drilling effect can be effectively improved. 本方案公开了钻孔灌注桩技术领域的混凝土灌注桩基础施工用辅助工具，包括螺旋钻头，螺旋钻头内部设有水管，水管一端连接有水箱，水管另一端连接有喷头，喷头的水平高度略高于钻头端部的水平高度。通过上述装置可在钻孔的同时，通过喷头喷水，在孔内形成一层保护膜，可有效避免钻好的孔内形成地质坍塌，可有效提高钻孔效果。