. Details of riveted railroad truss bridges . diameters of the rollers varyfrom 3 to 5 inches. The larger the rollers the better, for asmall roller is easily clogged up by dirt and rust. In all types of bridges the bearing plate and pedestalare connected to the truss by means of pins in order to allowfor any sagging. These pins vary from 4 to 6 inches in pedestal may be made of angles*§,nd plates or cast former is the most common, Fig,83 shows a type of built uppedestal with rollers. The rollers should be incased in a boxin order to keep out the dirt. -48- shows a
. Details of riveted railroad truss bridges . diameters of the rollers varyfrom 3 to 5 inches. The larger the rollers the better, for asmall roller is easily clogged up by dirt and rust. In all types of bridges the bearing plate and pedestalare connected to the truss by means of pins in order to allowfor any sagging. These pins vary from 4 to 6 inches in pedestal may be made of angles*§,nd plates or cast former is the most common, Fig,83 shows a type of built uppedestal with rollers. The rollers should be incased in a boxin order to keep out the dirt. -48- shows a cast steel pedestal. The only advantageof the cast steel over the built up pedestal is that in the castpedestal the pin in the rocker transfers the load over the larg-er bearing surface than can be done in the built up pedestal. O 0 o o opop o o o ()c X)(X r-) As only one end of the bridge is on rollers some pro-vision for the other end must be made in order to avoid usingdifferent heights of supports, A common way to do this is to.
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