Contract Volume 80

Contract Volume 80

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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. 1910 edition. Excerpt: ... safe bottom or give support to the timbering or sidewalls. In any stretch of the tunnel that is wholly in rock the Contractor will not be required to place concrete lining before the completion of the tunnel excavation unless it becomes necessary to do so in order to fulfil the provisions in Article VI for completion of the work, or unless the rock at any place is such as to make it advisable to line it promptly to prevent deterioration or falling. Measurement Sect. I7.q Whatever the quantity of concrete actually and payment., '. placed m grade tunnel, the quantity of concrete to be paid for under Item 17 shall be (a) the actual quantity of concrete placed in linings of earth tunnel of all types; (b) the ideal quantity of concrete in linings of tunnel of Types A and B measured, with deductions for timber, except wedges and blocking, to the " B line," or a line 13 inches outside of the "A trimming line,"' to the top of the 9-inch arch in Type A, and the arch as shown in Type B, or to the ordered position of the inside of permanent lagging as the case may be; (c) the actual quantity of concrete placed in earth portions of Type C, plus the ideal quantity in the rock portions measured in a manner similar to that described above under (b); (d) all concrete placed under the provisions of Section 17.5 above the 9-inch arch in Type A, and the T2-inch arch in Type B, the 1 in 4 slope, produced if necessary, constituting a division line at the sides; and (e) concrete in hitches for temporary timbering, as provided in Section 18.2. The division between concrete in grade tunnel and open cut is described in Section 62 and shown on the drawings. MISCELLANEOUS TUNNEL ITEMS TEMPORARY TIMBERING Item 18 Sect. 18.1 Temporary timbering...show more

Product details

  • Paperback | 50 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236748530
  • 9781236748539