Circular drill rod internal expansion type fisher for drill dropping in full-hydraulic drilling hole of cast-in-place pile

The utility model relates to a round drill rod internal expansion type fisher for drill dropping in a full-hydraulic drilling hole of a cast-in-place pile. A fishing rod is aligned with a drill bit, and a sliding block slides from top to bottom along a sliding rail distributed on the periphery of the fishing rod until the sliding block abuts against the drill bit, so that a fishing body is connected with the drill bit; an external driving device fills out the fishing rod with the drill bit through the connecting body, so that the fallen drill bit is fished out of the drill hole, and the whole fishing process is safe, convenient and reliable. 本实用新型涉及一种灌注桩全液压钻进孔内掉钻圆形钻杆内胀式打捞器，通过将打捞杆对准钻头，滑块沿着分布于打捞杆外周的滑轨自上而下滑动直至滑块抵接于钻头以实现打捞体与钻头的连接，外界驱动装置通过连接体将携有钻头的打捞杆捞出，从而将脱落的钻头自钻孔内捞出，整个打捞过程安全、便捷、可靠。