METHOD FOR BLASITNG UNDER PROTECTIVE COVER OF VEHICLE TIRES Russian patent published in 2008 - IPC F42D5/45 

FIELD: blasting.

SUBSTANCE: invention relates to the field of hard rock mining in a space-limited environment. A method for blasting under a protective cover made of vehicle tires consists in drilling blast boreholes, loading thereof and placing on the shelf a protective cover formed as a mat of vehicle tires connected together; attaching the mat using wire ropes or thin chains with anchors installed into short boreholes; mounting a firing circuit and blasting the rock. The protective cover has a two-layer structure. A vehicle tire is laid above each borehole of the first layer by aligning the vehicle tire hole being with the borehole centreline, the borehole is loaded and stemmed and an initiating pulse conductor is placed into the vehicle tire through this hole. Additional vehicle tires are placed between the laid vehicle tires or with a little offset and the adjacent vehicle tires are connected together using connectors. A protective cover for the next rows of the boreholes is formed in the same manner and connected to the previously laid cover. After loading the blasting boreholes and connecting the vehicle tires together to form a single mat, the latter is covered with a net overlapping the extreme vehicle tires and tied to the vehicle tire connectors. The net lap over the mat edges is soil padded or covered with additional vehicle tires, and the firing circuit is mounted above the net.

EFFECT: improving the safety of blasting operations due to complete prevention of rock fragments dispersion by using a gas permeable protective cover with a net.

4 cl, 6 dwg