Engineers and Engineering Volume 14

Engineers and Engineering Volume 14

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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. 1897 edition. Excerpt: ...load on a small area, every precaution must be taken to secure a sound foundation, and to have the walls plumb. In one instance, a building, twenty-six stories high, is entirely supported on jackscrews, by which any settlement in the foundation can be compensated. In some parts of New York City, bed-rock lies a considerable distance below water-line. To reach bed-rock in such cases, caissons have been sunk. Difficulty has been frequently encountered in digging for foundations, when adjoining buildings were underpinned with needles in the ordinary manner. The superincumbent weight of the buildings caused the soil to flow from under them into the excavation. In one instance, the attempt to attain the required depth had to be abandoned, as the soil rose almost as fast as it was excavated, and to prevent serious danger to the adjoining building, the floor of the excavation was rapidly and heavily cemented over. A comparatively new method, which avoids this danger and has been successfully applied in New York, is the underpinning of walls before any excavation is made by driving piles of iron pipe to bed-rock. These are sunk in short sections, screwed together, and then filled with cement, thus forming columns, on which the wall rests. Thus the support of the wall is entirely independent of the surrounding soil, which is not the case with ordinary underpinning. Mr. Richards.--I recall a case in our practice, in which rock foundations could not be had short of one hundred feet below the surface of the ground, wooden piles were driven to an intermediate stratum of about four feet of sand. They were then cut off four feet below surface, capped with timbers and brick buildings erected thereon, which have stood remarkably well. The sand strata more

Product details

  • Paperback
  • 189 x 246 x 6mm | 200g
  • United States
  • English
  • black & white illustrations
  • 123676160X
  • 9781236761606