. Railway maintenance engineering, with notes on construction . m =3O w 13O OP O1=1 o3o bflO o o I—I .f^,^? SHOPS AND ENGINE HOUSES 273 roof; and 3, the walls, which will be considered in the ordernamed. For the foundations and pits concrete is generally used, andif it is necessary to employ a deep foundation to get solid groundthe concrete may profitably be reinforced. Ventilator Roof Collar. C. Smoke Jack. (Dickinson.)Fig. 150.—Round Houses. Steel, on account of the corrosion of this material, due tothe engine gases, should not be used in the roof unless protectedby concrete. Many engineers
. Railway maintenance engineering, with notes on construction . m =3O w 13O OP O1=1 o3o bflO o o I—I .f^,^? SHOPS AND ENGINE HOUSES 273 roof; and 3, the walls, which will be considered in the ordernamed. For the foundations and pits concrete is generally used, andif it is necessary to employ a deep foundation to get solid groundthe concrete may profitably be reinforced. Ventilator Roof Collar. C. Smoke Jack. (Dickinson.)Fig. 150.—Round Houses. Steel, on account of the corrosion of this material, due tothe engine gases, should not be used in the roof unless protectedby concrete. Many engineers prefer the reinforced concrete roofto the wood roof on account of the fireproof constructionobtained. As much window space as possible should be allowed in the 274 RAILWAY MAINTENANCE walls. This leaves very little space to fill in except between thewindow sill and the floor. Brick or concrete is generally usedfor the walls, although in a wooden house the walls may bebuilt of wood. The end walls and fire walls are usually builtof the same material as used for the outer walls. The American Railway Engineering Association recommendsthe following: * (a) The material used in construction should be non-corrosive,unless proper care be taken to prevent corrosion. (6) Reinforced concrete should be used below the floor when it ischeaper than plain concrete. (c) The additional security against
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