吉林省洮安县研究创制一种打井工具,能在深4米以下的水底挖掘砂、卵石、泥土,用它可以挖直径0.5～6米的井眼。由四个人在井上操作,每班8小时可从井底挖出泥、砂2.1立方米。用这种工具挖井,可以一边挖一边沉放砖砌井筒,防止塌眼。工具构造简单,全重只有60公斤左右,造价70～80元。操作容易,效率较高(编者按:这种 Dao’an County, Jilin Province, has researched and developed a drilling tool to dig sand, pebbles and earth under the water bottom of 4 meters in depth, and can use it to dig boreholes with a diameter of 0.5 to 6 meters. Operated by four people in the well, 8 hours per shift, the mud can be dug from the bottom of the well and the sand is 2.1 cubic meters. Digging wells with this tool, you can dig while digging a brick shaft to prevent collapses. Simple structure of the tool, the total weight of only about 60 kg, the cost of 70 to 80 yuan. Easy to operate, high efficiency (Editor’s note: This