Remotely Placed Concrete/Gravel Columns for Point Support with InnovativeConcrete Placement Device and a Pneumatic Feeder for Remote Sealing and Support of Abandoned Mines

摘要

This report covers three separate areas of abandoned mine subsidence abatementtechnology. The first is the development of a cost effective method of remote placement of point support columns in abandoned mines through boreholes. The second is the design and test of a twin screw pneumatic pipefeeder for metering fill material into a pipeline for stowing in abandoned mine entries. The third area is a demonstration task to fill an abandoned mine tunnel using the high-efficiency pneumatic ejector and the pneumatic pipefeeder.