. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . l features required for a fit are (1) the angles(of the upper and lower surfaces of the bar where they fit againstthe rail, and (2) the height of the bar. The bolt-holes in thebar and rail must also correspond. The holes in the angle-barsare elongated or made oval, so that the track-bolts, which aremade of corresponding shape immediately under the head, willnot be turned by jarring or vibration. The holes in the rail
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . l features required for a fit are (1) the angles(of the upper and lower surfaces of the bar where they fit againstthe rail, and (2) the height of the bar. The bolt-holes in thebar and rail must also correspond. The holes in the angle-barsare elongated or made oval, so that the track-bolts, which aremade of corresponding shape immediately under the head, willnot be turned by jarring or vibration. The holes in the rails 318 RAILROAD CONSTRUCTION. §284. are made of larger diameter (by about 3^) than the bolts, so asto allow the rail to expand with temperature. In Table XXIV and in Fig. 124 are shown the angles and<dimensions for angle-bars to fit the standard rail sections shownin § 267. Note that the dimension a for the angle-bar corre-sponds with dimension F for the rail and that Ri and the angle a arethe same for both for each type of rail. These dimensions werecopied from the 1916 Handbook of the Carnegie Steel they correspond perfectly with the rail standards of the. ^. Fig. 124.—Standard Angle Bar. A. R. E. A., that association has not yet adopted any suchdefinite standard dimensions for a rail-joint. The standard drilling for bolt-holes in angle-bar, as adoptedby the A. R. E. A. in 1914, is as follows: For 6-bolt sphces, 5 spaces of 5| 4-bolt splices, 3 spaces of 5| inches. No definite recommendation was made by the Association asto the total length of angle-bars, but the committee recom-mended that, on the basis of the abo\ e spacing of holes, 24 inchesis a satisfactory length for a 4-bolt splice and 32 inches for a6-bolt splice, in both cases using suspended joints. On thisbasis, the spacing from the center of the last hole to the end ofthe bar would be 3| inches for the 4-bolt splice and 2$ inches forthe 6-bolt splice. In Plate VII are shown some of the
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
