. Railroad structures and estimates . d Fig. 6. Concrete Tunnel Lining with Steel Rib Reinforcement, C. C. & O. Ry. The steel reinforcement used on the C. C. & 0. Ry., Fig. 6,consists of 12 I beam ribs at 2 to 3 ft. centers, in two curvedsections spliced together just above the springing line of the arch,at the most dangerous points the ribs are placed 12 centers, theribs being carried down to the floor of the tunnel only on the sidefrom which the pressure occurs. 70 TUNNEL PORTALS. The A. R. E. A. recommend that concrete be used for the per-manent tunnel Uning except where local conditions wi
. Railroad structures and estimates . d Fig. 6. Concrete Tunnel Lining with Steel Rib Reinforcement, C. C. & O. Ry. The steel reinforcement used on the C. C. & 0. Ry., Fig. 6,consists of 12 I beam ribs at 2 to 3 ft. centers, in two curvedsections spliced together just above the springing line of the arch,at the most dangerous points the ribs are placed 12 centers, theribs being carried down to the floor of the tunnel only on the sidefrom which the pressure occurs. 70 TUNNEL PORTALS. The A. R. E. A. recommend that concrete be used for the per-manent tunnel Uning except where local conditions will injurethe concrete before there is time for it to harden. In the event that a brick lining be used, that portion of thearch for a horizontal distance of five feet on each side of the centerhne of each track should be laid with vitrified brick in rich Port-land cement mortar. Copinj to hire 3 pitchtowud face of w&U,6* Figures 14 hiih and depressed Face to be finbhed with 1 of cement mortir1:2 applied as forms are fllled. FACE OF PORTAL
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