tubular closure lost to drill holes.

摘要

device for closing tubular lost to drill holes for the injection of fluids such as, for example, the appropriate resin injection.mainly to strengthen the land.the device is mainly composed of a filling tube (1) is equipped at its end with a non-return valve (5) in fire safety,and a flexible element (2) in the elastic material surrounding the filling tube.the device is characterized in that the opening (9) in the fill tube (1) is provided with an additional valve (31).