File:Railroad structures and estimates (1918) (14759314335).jpg

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English:

Identifier: railroadstructur00orro (find matches)
Title: Railroad structures and estimates
Year: 1918 (1910s)
Authors: Orrock, John Wilson, 1870-
Subjects: Railroads Railroads
Publisher: New York, Wiley
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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case where the muck pile was high enough thedrills were put straight into the face of the top heading as persketch C, but when the muck pile w^as not high enough for this,the drills were driven in from beneath, as in sketch D. Themethod principally used however was to first take out a top head-ing with a semi-circular roof 9 ft. high at the centier, forming thearch of the tunnel, sketches E, F and G, and then blast out thebench and remove by steam shovel. In the tunnel work 60 per cent dynamite was principally used,making less fumes and securing quicker ventilation of the tunnelthan was possible with the Judson powder; and 40 per centdjmamite was used on the outside rock work. The general cross sections of the tunnel construction both forwood and concrete as well as steel rib reinforcement are shown inFigs. 6, 7, 8 and 9 and may be taken as typical for this class ofwork. The approximate cost and quantities for the differentsections are given on pages 71, 72 and 73. TUNNEL DRIVING. 65
Text Appearing After Image:
66 TUNNEL DRIVING. A novel method adopted in the construction of the Connaughtdouble track tunnel on the C. P. R. consisted in driving fromeach end a pioneer tunnel parallel with the main tunnel butabout 50 ft. distant from it. From the pioneer tunnels, cross-cuts were driven to the center line of the main tunnel at intervalsof 1400 to 3000 ft. From each of these points the main tunnelheading was driven. The pioneer tunnels were merely a means of expediting thework by producing numerous points of attack and it is statedthat the cost of the work and rate of progress amply justified theauxiliary tunnel work. The main tunnel is 26,400 ft. long, 29 ft.wide at rail level with vertical sides and semi-circular roof 23 ft.above subgrade to crown. An isometric elevation and cross sections of the tunnel takenfrom Engineering News, Vol. 74, No. 20, is shown. Figs. 4 and 5. MountMacdonald

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Author Orrock, John Wilson, 1870-
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Flickr tags
InfoField
  • bookid:railroadstructur00orro
  • bookyear:1918
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Orrock__John_Wilson__1870_
  • booksubject:Railroads
  • bookpublisher:New_York__Wiley
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:80
  • bookcollection:library_of_congress
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014


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