METHOD TO ELIMINATE INFLOWS IN TUNNELS WITH LINING FROM HIGH-PRECISION BLOCKS Russian patent published in 2011 - IPC E21D11/38 

FIELD: mining.

SUBSTANCE: method to eliminate inflows via lining in collectors from high-precision units consists in elimination of water inflow in coupling units of assembly elements of structure by means of sealing gaps and cracks between blocks by installation of injector and injection of sealing compound into seams between blocks. Injection is made in joint of coupling planes of assembly elements. At the same time previously specified area of water inflow is confined by drilling of at least two key holes in plane of coupled joints for depth of block sealant location at the distance from each of key holes to area of injection equal to 1.0-1.5 of distance from surface of block to block sealant. Then sealing keys are installed with material having bearing strength of at least 5 MPa/cm² into each of key holes, afterwards sealing compound is injected.

EFFECT: increased strength of injected joints and reduced consumption of expensive hydraulic insulation material.

8 cl, 1 dwg