. Railway age . neat line, 11,27() cu. yds.; ma-sonry above neat line, 4,274 cu. yds.; granitecoping, GtiO cu. yds. The proportions inwhich the concrete was mixed were 1-2-5. The entire length of the structure is:From face of south bridge seat to center lineof rest pier, 9:J6 ft.; from face of northbridge seat to center line of rest pier, ; draw span, center to center of rest piers,331 ft.; total, 2,919 ft. The length of theold draw was 472 ft. The fenders for pivot and rest piers are built of 12 by .supported on piling. That of the pivot pier is built in with
. Railway age . neat line, 11,27() cu. yds.; ma-sonry above neat line, 4,274 cu. yds.; granitecoping, GtiO cu. yds. The proportions inwhich the concrete was mixed were 1-2-5. The entire length of the structure is:From face of south bridge seat to center lineof rest pier, 9:J6 ft.; from face of northbridge seat to center line of rest pier, ; draw span, center to center of rest piers,331 ft.; total, 2,919 ft. The length of theold draw was 472 ft. The fenders for pivot and rest piers are built of 12 by .supported on piling. That of the pivot pier is built in with 4 by 8-in. diagonal bracing between piles, 6 by and 4 by 8-in. bracing, all of yellow pine, and bolted with1-in. and lV4-in. bolts. The sheathing is 5-in. yellow pine placedvertically and carried by three 12 by 12-in. stringers. The bentsnext the pier itself, on each side, where pile support is imprac-ticable on account of the pier foundation, have six 12 by in iihu-e of tluci>.. Elevation and Floor System of Girder Spans. SLTEIISTBUCTLRE. The superstructure, which was erected by the PennsylvaniaSteel Company, presents no features of special Interest beyond ageneral appearance of sul)stantiality. With the exception of thedraw, all spans are plate deck girders, 8 ft. 6 in. deep; four spanslat the south end and 11 at the north end being 88 ft. long, theabutment spans 81 ft., the intervening spans 100 ft., and the drawspan, as stated, 331 ft. The plate girders amount to al>out 4,000tons of steel and the draw span to about 1,200 tons.
Size: 2019px × 1238px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
