Engineering contracts and specifications . eneral for all Materials,structures. Wrought iron will be used for loop-welded rods. Cast steel will be used for wedges,gearing, couplings and other important details of 460 COMPLETE SPECIFICATIONS. StandardDesigns. Guage ofTrack. Clear Cross-Section. TrussBridges. drawbridge machinery. Cast iron will be used forminor details of drawbridge machinery, and forother work when expressly stipulated. 2. Rolled-beam bridges and plate-girderbridges will in general conform to the PennsylvaniaRailroad standard drawings. The Rail-road Company will furn
Engineering contracts and specifications . eneral for all Materials,structures. Wrought iron will be used for loop-welded rods. Cast steel will be used for wedges,gearing, couplings and other important details of 460 COMPLETE SPECIFICATIONS. StandardDesigns. Guage ofTrack. Clear Cross-Section. TrussBridges. drawbridge machinery. Cast iron will be used forminor details of drawbridge machinery, and forother work when expressly stipulated. 2. Rolled-beam bridges and plate-girderbridges will in general conform to the PennsylvaniaRailroad standard drawings. The Rail-road Company will furnish diagrams showing thegeneral dimensions of all truss bridges and of suchspecial girder spans as are not covered by standarddrawings, 3. Gauge of track is 4 feet SJ inches. Dis-tance from centre to centre of double track is 12 feet2 inches unless otherwise specified. 4. A section as per accompanying diagrammust be kept clear in single-track through to be proportionately increased for two ormore tracks^ and for curved * SECTION 2.—DATA FOR CALCULATION. AssumedDimensions. 5. As a basis for calculation assume the fol-lowing general dimensions:-—A—Length:— (i.) Trusses.—Distance from centre tocentre of end pins. SPECIFICATIONS FOR STEEL RAILROAD BRIDGES. 461 (2.) Riveted girders.—Distance from cen-tre to centre of bearings. (3.) Floor beams.—Distance from centreto centre of trusses. (4.) Track stringers.—Distance from cen-tre to centre of floor —Depth :— (i.) Pin-connected trusses.—Distance from centre to centre of chord pins. (2.) Riveted trusses.—Distance betweencentres of gravity of chords. (3.) Riveted girders.—Distance betweencentres of gravity of flanges, or dis-tance from back to back of flangeangles if the latter dimension is thesmaller of the two. 6. In estimating the dead load the weight of ^^g^J^^timber shall be taken at 4-J pounds per foot B. M. 7. The dead load shall be assumed as uni- Dead Load,formly dis
Size: 1604px × 1558px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1900, bookpublishernp, bookyear1902
