. American engineer and railroad journal . beproportioned for a rolling load of 62 lbs. per square foot,or of a train of loaded wagons weighing six tons per axle. The plan adopted has an arch of parabolic form, havinga span of ft. and a rise of ft. The arch is com-posed of two riveted trusses resting on masonry abutmentson either side ; these trusses are ft. deep at the abut-ments and ft. at the center. The trusses are inclinedtoward each other, being ft. apart at the abutmentsand ft. at the crown of the arch. The roadway issupported by vertical struts which are
. American engineer and railroad journal . beproportioned for a rolling load of 62 lbs. per square foot,or of a train of loaded wagons weighing six tons per axle. The plan adopted has an arch of parabolic form, havinga span of ft. and a rise of ft. The arch is com-posed of two riveted trusses resting on masonry abutmentson either side ; these trusses are ft. deep at the abut-ments and ft. at the center. The trusses are inclinedtoward each other, being ft. apart at the abutmentsand ft. at the crown of the arch. The roadway issupported by vertical struts which are carried on Ihe arch ;a few of them on either side are beyond the arch and rest VoL LXVI, No. 2.] ENGINEERING JOURNAL. 79 on foundations made in tlie rock. These uprights arespaced ft. apart. The trusses of the arch are thor-oughly braced l)y a system of cross-bracing. They rest atthe ends on cast-iron shoes secured to the masonry. Thetotal weight of the britlge is 204,480 lbs. Very little masonry was retjuired, as the rocky sides of. the gorge furnished foundations everywhere, only requir-,ing work enough to make level beds for the abutmentsand supports. In erecting the bridge advantage was taken of thepeculiar section of the gorge to erect scaffolding, as shown
Size: 1641px × 1523px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
