. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . Fig. 137. — Ballast Experiments — Schubert. Stone resting on clay subgrade. the force transmitted through the tie has distributed itself nearly over theentire width of the box. Hence, the most favorable distribution of forces is accomplished by theuse of ballast of broken stone, with or without a foundation layer. The latteris, however, not suitable in a yielding subgi-ade, inasmuch as the stones pene-trate into the grade, and the yielding soil will swell into th
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . Fig. 137. — Ballast Experiments — Schubert. Stone resting on clay subgrade. the force transmitted through the tie has distributed itself nearly over theentire width of the box. Hence, the most favorable distribution of forces is accomplished by theuse of ballast of broken stone, with or without a foundation layer. The latteris, however, not suitable in a yielding subgi-ade, inasmuch as the stones pene-trate into the grade, and the yielding soil will swell into the spaces, thus makingthe drainage ineffective. The effect of overloading the subgrade is very clearly shown in Fig. 138. SUPPORTS OF THE RAIL 183 * The road department of the Pennsylvania Raihoad has installed aninteresting piece of apparatus on the grounds of the South Altoona foundryto test the bearing qualities of different kinds of roadway and ballast. The. Fig. 138. — Effect of Overloading the Subgrade. (Am. Ry. Eng. Assn.) particular ballast or subgrade to be tested is placed in three heavy boxes thatextend across the track and have sufficient depth to serve the purpose. Thetrack crosses this on a level and extends out on either side, terminating in a short
Size: 2067px × 1209px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidsteelrailsth, bookyear1913
