Tunnel Shields and the Use of Compressed Air in Subaqueous Works
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Tunnel Shields and the Use of Compressed Air in Subaqueous Works

Tunnel Shields and the Use of Compressed Air in Subaqueous Works


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...necessity of closing the doors never arose at the St. Clair tunnel. To compensate for the weakening of the diaphragm by the openings for the rams, an extra plate M, 16 inches wide and inch thick, was rivetted all round the diaphragm, which was further strengthened by the gussets N, N, rivetted to the front of the diaphragm and to the cylindrical skin, and carrying the rams, twenty-four in number. The tail of each cylinder was fitted in a ring bolted to the gussets, and the head was flanged and bore against the main bulkhead. The rings are shown in the section G, H (Fig. 107), and the flanged heads are seen clearly in the detail drawing in Fig. 109. About 4 feet in front of the bulkhead, the shield was stiffened by three vertical and two horizontal girders 0, 0, 0, all of which served to stiffen the shield, and the latter of which formed working platforms. It will be seen from the section E, F, in Fig. 107, that by this arrangement an open space 4 feet wide was provided between the working platforms and the bulkhead, thus enabling the miners to cast the spoil from the face down into the invert in front of the doors in the bulkhead. A peculiar feature in the shield was the securing of the bulkhead to the vertical girders by straps of wrought iron P, P, P, 4 feet 9 inches long, 7 inches wide, and J inch thick. These were intended to support the bulkhead or diaphragm in the event of an inrush of water or material, when of course, if the doors in it were closed, the pressure to be sustained would be very great. The straps in question were useless as stiffeners of the shield: had the vertical girders been carried back to the main diaphragm or bulkhead, the shield would have been much stronger. It was found in actual work that these shields required, in addition t...


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Product Details
  • ISBN-13: 9781152088122
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 140
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1152088122
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 263 gr


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