. Details of railroad truss-bridges . ( X )( )( ). to the roller-nest. The rollers for railroad bridges should be not less thansix Inches in diameter. If smaller rollers are used,the nest isliable to become clogged with rust and become useless. The size andrequired number of rollers depend upon the amount of stress trans- 27. mitted by the shoe-plate. In long-span bridges a large number of rollers are neces-sary to give sufficient bearing area. Segmental rollers are usuallyemployed to reduce the size of the bearing plates and pedestals,A common type of segmental roller nest i
. Details of railroad truss-bridges . ( X )( )( ). to the roller-nest. The rollers for railroad bridges should be not less thansix Inches in diameter. If smaller rollers are used,the nest isliable to become clogged with rust and become useless. The size andrequired number of rollers depend upon the amount of stress trans- 27. mitted by the shoe-plate. In long-span bridges a large number of rollers are neces-sary to give sufficient bearing area. Segmental rollers are usuallyemployed to reduce the size of the bearing plates and pedestals,A common type of segmental roller nest is shown in Thedistance between the centers of the rollers is usually about one-half of their height. Contact between the parallel sides of therollers prevent them from tipping over; but an additional provisionagainst tipping is afforded by means of side engage instud-bolts screwed Into the ends of the rollers. The clearance be-tween the hooK of the upper plate and the square ends of the lowerplate should be great enough to a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1910
