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我队在水井工程施工过程中，扫浮塞时不慎把一异径接箍扫坏，将外径为275mm，长为57m的铸铁井管掉入159m深的井内。并且井管头部管内被浮塞堵塞，井管上端倒入井壁，用木锥卡取法已不奏效。为此，我科设计了一种活门式卡捞工具，一次打捞成功。该工具承受了20多吨的拉力没有发生任何问题。实践证明，这种工具具有加工简单、使用安全可靠、打捞有效的特点，现介绍如下。
During the construction of the well, the team inadvertently wrecked a collapsible coupling while cleaning the floating plug. The cast-iron tubular casing with an outer diameter of 275mm and a length of 57m was dropped into a well of a depth of 159m. And the tube head pipe was plugged plug, well tube into the top of the shaft wall, wood cone method has not worked. To this end, our department designed a valve-type fishing tools, a successful recovery. The tool withstands more than 20 tons of tension without any problems. Practice has proved that this tool has a simple processing, the use of safe and reliable, effective salvage features are presented below.