METHOD TO INSTALL BLAST EXPANSION ANCHOR Russian patent published in 2013 - IPC E21D20/00 

FIELD: mining.

SUBSTANCE: blast expansion anchor is inserted into a well head by serially connected sections of pipes and arranged on the section of potential caving of side rocks. A section of a detonating cord with a detonating cap of instant action is inserted into the cavity of the blast expansion anchor, a drilling head is installed. Then the section of the well between its head and the drilling head is filled with an explosive, installing a detonating cap of moderate action. The section of the detonating cord is exploded 1-2 seconds ahead of explosion of the explosive.

EFFECT: increased stability of underground mines due to increased thickness of rock layers fixed by blast expansion anchors of increased length and installed ahead of explosion of a well charge.

3 cl, 7 dwg