TUNNEL TUBING RING FOR UNDERGROUND STRUCTURES OF SUBWAY Russian patent published in 2014 - IPC E21D5/10 

FIELD: construction.

SUBSTANCE: tunnel tubing ring comprises cast iron lining of a tunnel assembled from a row of joined metal tubings each made in the form of cylindrical segments connected to each other via holes by bolted joints. On the inner surface of the back of each segment there are internal round stiffening ribs that form internal caissons. The ring is equipped with a tray block made of a reinforced concrete part and a metal tray board made in the form of a box-shaped cast iron ingot of rectangular profile and a cast iron tubing. The cast iron tray board has a flat back of rectangular shape that changes into radial boards to form two internal caissons. In the boards of the specified caissons there are holes, via which the specified board is connected with the help of bolted joints with hydraulic insulation and pressing washers both with the cast iron tubings of its own ring and the tray board. On parallel and radial boards there are chased grooves for further sealing of board joints.

EFFECT: provision of tying of tubing rings, reduced labour intensiveness of horizontal section planning in a tunnel, improved hydraulic insulation of a tubing ring, simplified process of support assembly.

4 cl, 13 dwg