. Railway track and track work . rst class heavy track, however, it will probably be supple-mented by a base support to the rails, as noted below. In some of the older joints, the outside bars extended along the side ofthe rail head, but this practice has been abandoned. The bars should be sodesigned and proportioned as to make the joint as strong and stiff as thebody of the rail, in which particular many joints are defective, especiallyas to the stiffness to resist slight deflections. The bars are usually of uni-form section throughout, but sometimes have the thickness of the web in-creased a
. Railway track and track work . rst class heavy track, however, it will probably be supple-mented by a base support to the rails, as noted below. In some of the older joints, the outside bars extended along the side ofthe rail head, but this practice has been abandoned. The bars should be sodesigned and proportioned as to make the joint as strong and stiff as thebody of the rail, in which particular many joints are defective, especiallyas to the stiffness to resist slight deflections. The bars are usually of uni-form section throughout, but sometimes have the thickness of the web in-creased at the middle by tapering from the ends or by offsets, as in theSamson bar. The flange sometimes extends only about %-in. beyond therail base, or barely enough to give a hold for the slot spikes, as in (B) , which spikes may be crowded out of position by a creeping track. It isbetter to have wide flanges with deep slots for the spikes, and some roadshavQ them wide enough for spike holes instead of slots, the spikes then re-. Fig. 30.—Sections of Splice Bars. sisting motion in every direction and the gage being more permanentlymaintained. The base of the flange is usually brought down level with thebottom of the rail, so as to take a bearing on the tie, as in Figs. 27, 29 and39. Many roads, however, keep the flange clear of the tie, as in Fig. 39 (C)and Fig. 41, but this practice is not to be recommended. The sections ofsplice bars vary very greatly, as shown in the illustrations, but one of thebest is the Sayre section, shown in Fig. 27. The heavy top chord makes anexceptionally stiff bar, with wide bearing surface for the rail head. Fig. 39(A) shows the Dudley design of bar of high-carbon steel for the 80-lb. railsof the New York Central Ry. The thick, narrow-flanged bar of the Penn-sylvania Ry. is shown at (B), while (C) is the bar of the Chicago, Burling- FASTENINGS AND JOINTS. 89 ton & Quincy Ry. At (D) and (E) are the heavily flanged bars of the At-chison, Topeka &
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
