. Railway track and track work . s with flanges about 3 ins. wider than usual. Thebars are heated, and the middle portion of the broad flange is pressed downvertically to project about 2% ins. below the base of the rail, thus giving ad-ditional stiffness. The bars are not cut or notched for bending, but theflat ends of the bars are punched with two spike holes in each. The sec-tion of the upper part of the bar is similar to that of the Sayre bars. TheThomson joint is somewhat similar, but the bottom webs are inclined in-ward at an angle of 45°, and extend 3% ins. below the base of the
. Railway track and track work . s with flanges about 3 ins. wider than usual. Thebars are heated, and the middle portion of the broad flange is pressed downvertically to project about 2% ins. below the base of the rail, thus giving ad-ditional stiffness. The bars are not cut or notched for bending, but theflat ends of the bars are punched with two spike holes in each. The sec-tion of the upper part of the bar is similar to that of the Sayre bars. TheThomson joint is somewhat similar, but the bottom webs are inclined in-ward at an angle of 45°, and extend 3% ins. below the base of the webs are only 7 ins. long, the ties being set about 22 ins. c. to c. Thebars are 31 ins. long, With six bolts, and for 100-lb. rails they have an areaof sq. ins., with a weight of lbs. per pair. Breakage of Angle Bars.—The irregular manner in which splice bars frac-ture is due to the very varying conditions of load and support. The jointties may be loose from the rails or loose from the ballast, and the transfer. Plan. sf- =* Ew,. News. Fig. 40.—Bonzano Rail Joint; Pennsylvania Ry. of the load from one rail to the other effects a reversion of strains in theangle bar at each wheel passage. Breaking of the angle bars from the bot-tom is often due to carelessness in raising track, the joints being raised toohigh before the centers or quarters are raised, instead of. maintaining aproper surface in raising. With a wheel on each side of a supported joint,the tendency is to throw the joint up, the top of the bars being then in ten-sion. With a suspended joint, the bars gradually get a deflection at themiddle, and when the joint is raised, the tension strain is transferred fromthe bottom to the top of the bar. It has already been shown that the en-tering rail receives from each wheel a severe blow a few inches back fromthe end, which tends to loosen and drive down the shoulder tie of a sus-pended joint, unless it is kept well tamped. If this tie is allowed to be-come
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
