PROTECTIVE SHIELD CREATION METHOD Russian patent published in 2013 - IPC E21D9/04 E21D11/04 

FIELD: mining.

SUBSTANCE: protective shield creation method at driving of a tunnel under earth fill consists in stepped forcing of tubular sections and excavation of rock from them. Prior to the next section forcing, a sector is cut out in the preceding section from its inner cavity by the value of a forcing step and the forces section is installed in the above cut-out. Each section is made in the form of tubes with cut-out sectors within 90÷120 degrees and connected to each other on edges of the cut-out sectors.

EFFECT: improvement of hygienic and sanitary operating conditions of a shield in the section at simultaneous reduction of metal consumption for a process.

7 dwg