Arts and Sciences; Or, Fourth Division of "The English Encyclopedia" Volume 6

Arts and Sciences; Or, Fourth Division of "The English Encyclopedia" Volume 6

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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. 1867 edition. Excerpt: ... is sought, in cases where these precautions are taken, to render the whole of the foundation homogeneous, and to guard against any lateral displacement by the piles turning over on their lower external edges, an accident which often occurs when a lofty quay wall is built upou a compressible subsoil; and although the precautions may be costly, the result of the works executed in many of our own, and in many foreign, sea-ports, proves that they cannot safely be dispensed with. PILE-ENGINE. The machinery used for the purpose of driving piles is rather varied; but it is only within a very few years that it hag assumed anything like a scientific character, or has admitted the application of any mechanical power other than mere brute strength. The pile-engines which are still used in countries behind the spirit of the age in the development of the mechanical arts, such as Holland, Germany, Spain, or Italy, are the old-fashioned ringing engine, in which a monkey, or a large hammer, is raised by means of a pulley and a rope, the latter buing connected with a. great number of corda, which are pulled in unison by an equal number of men. The weight of the monkey of these machines is usually about 10 or 12 cwt., and the fall is only from 4 feet to 4 feet 8 inches; and in practice it is found that the dynamical force, thus brought to bear upon the piles, is not sufficient to drive them through grounds of any notable degree of resistance; the ringing engines, moreover, require so much space, and so great a number of men, as to render their use extremely inconvenient when numerous piles have to be driven in a small area. In England and in France the pile-engines generally used consist of n vertical frame of about 24 feet, or at times 3U feet, in height, more

Product details

  • Paperback | 860 pages
  • 189 x 246 x 43mm | 1,506g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236575148
  • 9781236575142