The Timberman Volume 18

The Timberman Volume 18

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...impractical to tunnel a slide which usually is creeping constantly and therefore one would be forced to circle it by exterior excavation and accept the inevitable cost of removing every slide which may come down. In order to lessen this possibility by slides, it is always advisable to wall up the high sides of the cut and reduce the angle of repose as much as possible. As an example of this condition I cite the shell rock point on the Oregon-Washington Railway & Navigation Company, opposite Wind Mountain on the Columbia River. 2. Supposing the canyon wall is perpendicular or nearly so and solid rock. There are here but two alternatives. Either to tunnel or suspend a bridge from the wall proper. The Denver & Rio Grande Railroad in the Royal Gorge has utilized this latter manner of overcoming the difficulty rather than tunneling. and thereby 'saves much expense as well as curvature in the ine. 3.' Take the example of a canyon wall on 60 degree slope. It may be advisable here to ex COMMON GEOLOGICAL FORMATIONS. ILLUSTRATTNG DIFFERENT TYPES OF FAULTS. AND HOW THEY MAY BE OVERCOME IN CONSTRUCTION WORK. The chief reason for tunneling is to reduce grade and length of line. It may also prove the least expensive way of advancing the grade and the least costly to maintain. Even when the tunnel is not forced for topographic reasons, it may be good business to tunnel in preference to circling the point. Under some conditions tunnels are expensive to drive and it is always good judgment to prospect thoroughly the ground through which a tunnel must be driven. In order that you may have some idea of the cost of driving a tunnel and under varying conditions. the following examples are cited: 1. McCormick Lumber Company, McCormick, ...show more

Product details

  • Paperback | 126 pages
  • 189 x 246 x 7mm | 240g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236971698
  • 9781236971692