Rock Products Volume 18, No. 12

Rock Products Volume 18, No. 12

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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. 1916 edition. Excerpt: ... built on the North American continent. The loading for the arch rings includes a uniform load of 200 pounds per square foot for the central 17' of the bridge, 150 pounds for the remainder of the roadway and 150 pounds for the sidewalks. The total width of the structure is 05'. Two 8' sidewalks are to be cantilevered from the roadway, provision being made for two street car tracks, and there are in addition to the foregoing, two 14' roadways. The fencing on either side of the bridge, when completed, will consist of a concrete fence of spindle and pedestal type design. A pneumatic concrete mixer and conveying machine was used in the construction of the bridge, the concrete being conveyed into the arches through pipes. The mixing plant was used to place all concrete after August, 1914, until cold weather set in. It is remarkable that in December a record for yardage on concrete placed was established. During the first fortnight that the plant was in operation this mixer placed over 2,600 cubic yards, and a single arch ring, aggregating 500 cubic yards, was concreted in seventeen and one-half hours of operating time. With the delivery end of the pipe line 375' from the mixer, an average of fifty batches an hour was maintained, and at 1,000' thirty-five batches an hour was the output over a lengthy running period. Near to the mixer was placed a steel receiver of 125 cubic feet capacity, acting as a reservoir, under a working pressure of 110 pounds to a square inch. It has been found that only about 5,000 cubic yards of concrete can be placed through spiral-riveted and lock-joint steel pipe before leakage develops, but that English seamless steam pipe will deliver 10,000 to 15,000 cubic yards; while the life of oil well casing may be measured...show more

Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236964608
  • 9781236964601