The invention relates to an
underwater concrete sampler of an
engineering stake, which comprises a hand rocking
handle, a measurement
rope box, a measurement
rope, a depth coder, a suspension ring, an iron ring, reinforcing steel bars, a
chassis, etc. When the sampler is used for sampling, a
drill is first used for drilling to reach designed depth, and then concrete is perfused to reach the depth of the stake top of a designed
engineering stake. Next, a
pulley is arranged at the edge of the
drill, and the measurement
rope is put on the
pulley. Then, the sampler is put on the mouth of the
drill, and the jointing point of the suspension ring and the measurement rope is used as the start depth of zero. Meanwhile, a zero position is ensured to be parallel to the ground. After that the hand rocking
handle is rocked, scales of the depth on the depth coder or on the measurement rope can be observed as the measurement rope is put downwards. When the jointing point of the suspension ring and the measurement rope reaches the designed concrete surface or the stake top of the
engineering stake, the measurement rope is lifted and then is put downwards, at last the sampler is lifted. If carpolites of the concrete are in an iron cage, the concrete is proved to exist on the jointing point of the suspension ring and the measurement rope. Thus, the sampler has the advantages of simple operation and accurate judgments.