The Tower Bridge; Its History and Construction from the Date of the Earliest Project to the Present Time

The Tower Bridge; Its History and Construction from the Date of the Earliest Project to the Present Time

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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. 1894 edition. Excerpt: ...irons of sufficient width to take a double line of rivets, and which also served to support the timber frames used for staging the skin above each of the horizontal joints. These frames were composed of 14in. pitch pine timbers, with diagonal struts at each of the corners. The temporary caisson was similar to the upper portion of the permanent one, but somewhat lighter, the skin plates diminishing from gin. at the bottom to Jin. at the top. The timber frames were also reduced from 14in. square to half-timbers 12in. by Gin. The water-tight joint between the temporary and permanent caissons was made by a small strip of indiarubber jin. diameter, as shown in Fig. 30. As an additional precaution a second strip of india-rubber, 3in. in diameter, was laid outside the skin plates between two angle irons, but the joints proved so water-tight, that after the first five caissons had been sunk, this extra strip was omitted in the remaining cases. As the Tower Bridge Act provided that the piers should not exceed 70ft. in width within a depth of 34ft. below Trinity high-water mark, the highest level for the joint between the temporary and permanent caisson was necessarily fixed. For facility of erection and removal, the temporary caisson was divided horizontally into four sections. As previously mentioned, all the caissons were sunk so that there was a space of 2ft. between each adjoining pair. For the purpo3e of connecting them together after sinking, two angle irons were riveted on at each corner--see Fig. 29--so as to form grooves extending from the top of the temporary to the bottom of the permanent caisson. After the caissons had been sunk, piles were driven between them within these grooves, thus closing these narrow spaces. The first pile was...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236574044
  • 9781236574046