The Viaduct Works' Handbook
Forfatter: Henry N. Maynard
År: 1868
Forlag: E. And F. N. Spon
Sted: London
Sider: 108
UDK: 624.3
Being A Collection Of Examples From Actual Practice Of Viaducts, Bridges, Roofs, And Other Structures In Iron; Together With Tables Of Prices, Weights, And Other Information Useful To Engineers In Design And Estimating Wrought And Cast-Iron Work
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77
ordinary crossing is represented in Fig. 1 of the accompanying illus-
tration of double-headed rails, solid welded V part, and on cast-iron
chairs. Fig 2 is a similar crossing ; but with bolted V part : average
price about £10 per set complete. Fig. 3 represents crossings of
either flange rail or bridge rail, rivetted to wrought-iron plates. Fig.
4 is an obtuse crossing for over road, and may be made of either of
the sections shown.
Points and Crossings.—Ordinary Crossing, Narrow Gauge :—
Length from point to crossing . = 75 feet
Total length from point to point . = 165 „
Radius ........................................= 600 „
Angle of crossing . . . . = 1 in 10
Length of inner switch . . . = 10 feet
Ditto of outer switch . . . = 15 „
Throw of ditto, at point . . = 4 inches
Clearance of ditto, at point . . = 82 »
Length of guard rail . . . = 8 feet
Clearance of ditto . . . . = 1% inches.