PROCESS OF TUNNEL CONSTRUCTION Russian patent published in 1996 - IPC

FIELD: mining industry. SUBSTANCE: working of earth in face is carried out from erection chamber. In this chamber there are assembled power plant, pressure cross-piece and elements of support. Section of power stage which carries supporting fixture is placed inside element of support. Supporting fixture is mounted between butts of adjacent elements of support for interaction with rear butt of movable element of support. With movement of due element of support its front butt is placed closely to sealing element and with clearance relative to corresponding supporting fixture. Each section of power stage is manufactured in the form of spatial metal girder. When placed inside proper element of support it is mounted on base of the latter. After removal of power stage and supporting fixtures each space formed by butts of adjacent elements of support and inner surface of proper sealing element is built up. EFFECT: enhanced efficiency of tunnel construction. 2 cl, 7 dwg