Structural Details, or Elements of Design in Heavy Framing

Structural Details, or Elements of Design in Heavy Framing

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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. 1909 edition. Excerpt: ...the sticks cannot be placed in contact, since moisture would collect between them and start decay. To avoid this they are spaced from one to two inches apart, although sometimes the clear distance is even greater. The spacing is secured by cast-iron separators or spools, or by wooden packing blocks. The iron devices are preferable as they are not so liable to gather moisture. Numerous forms of separators and spools are employed, Figs. 39/7, b, and c, showing one form of spools and two forms of separators. A substitute for a separator consists of two washers with their larger flat sides against the timbers and the smaller ones in contact. Fig. 73 shows the plan of a steel packing plate which also serves as a splice plate to aid in holding together the ends of the stringers. The plate is separated from the timbers by thin cast-iron separators. A packing splice is also indicated in Fig. 39/. When no bolsters are used, it extends below the stringers and is notched over the cap to hold the stringer in place. Four 3-inch bolts are usually employed at each joint. Timber packing blocks are objectionable on account of holding moisture and promoting wet rot in the adjacent sticks. When it is possible to secure the timber of the requisite length, the sticks composing the string-FlG.3gd. Packing of stringers, ers should extend over two spans and break joints over the caps of the bents. The arrangement of the bolts shown in Fig. 39/ is such that when used with steel splice plates the stringers have been known to carry a train in safety when one supporting bent was washed out. The lower part of the splice plate is in tension in such an emergency, and hence the lower bolts are placed farther apart to give a larger resistance to shearing or splitting in the ends...
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Product details

  • Paperback | 90 pages
  • 189 x 246 x 5mm | 177g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236578260
  • 9781236578266