Concrete Cutting Sawing Taunton MA Mass Massachusetts

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Following the line concrete beams of 10-foot span, it is found that a concrete beam 8 inches deep and 5 inches wide (853 X 5 = 4,265) would support the load of 4,000 pounds, and the deflection would be 1.24 8 = .16 inch. A second solution would be to use a concrete beam 12 inches deep and 2 inches wide (1,920 >< 2 = 3,840); but according to the table, this concrete beam would not be quite strong enough, as it would only support a load of 3,840 pounds. The values given in Table XXII are based on the formula mentioned. If a concrete column 10 feet long is required to support a load of 20,000 pounds, what would be the size of the concrete column required if short-leaf yellow pine was used? Dividing the length of the concrete beam in inches by the assumed least diameter, 6 inches, we have 120 ± 6 = 20, which gives the ratio of the length to the diameter. By the table it is shown that 2,857 pounds is the ultimate strength for a concrete column of short-leaf pine, when I ~ d = 20.

Assuming a factor of safety of 5, and dividing 2,857 by 5, the working load is found to be 571 per square inch. Dividing 20,000 by 571, it is found that a concrete column whose area is 35 square inches is required to support the load. The square root of 35 is 5.9. Therefore a concrete column of short-leaf yellow pine 6 inches square will support the load. In constructing the 175th Street Arch in New York City, the forms were built so that they could be easily moved. The arch is elliptical and is built of hard-burned brick and faced with granite. The span of the arch is 66 feet; the rise is 20 feet; the thickness of the arch-ring is 40 inches and 48 inches at the crown and springing line, respectively; and the arch is built on a 9-degree skew. The total length of this arch is 800 feet. This arch is constructed in sections, the centering being supported on 11 trusses placed perpendicular to the axis of the arch and having the form and dimensions shown in Fig. 170. The trusses are placed 5 feet on centers, and are supported at the ends and middle by three lines of 12 by 12-inch yellow pine caps.

The caps are supported by 12 by 12-inch posts spaced five feet center to center, and rest on timber sills on concrete foundations. The upper and lower chord members of the trusses are of long-leaf yellow pine, but the diagonals and verticals are of short-leaf yellow pine. The lagging is 23 by 6-inch long-leaf yellow pine plank. The connections of the timbers are made by means of -inch steel plates and i-inch bolts arranged as shown in the illustration. As it was absolutely necessary to have the forms alike, so that they could be moved along the arch and at all times fit the brickwork, they were built on the ground from the same pattern, and hoisted to their place by two guyed derricks with 70-foot booms. On the 12 by 12-inch cap was a 3 by 8-inch timber, on which the double wedges were placed. When it was necessary to move the forms, the wedges were removed, the forms rested on the rollers, and there was then a clearance of about 21 inches between the brickwork and the lagging.

The timber on which the rollers ran was faced with a steel plate I inch by 4 inches. The forms were moved forward by means of the derricks. The settlement of the forms under the first section constructed was I inch; and the settlement of the arch-ring of that section after the removal of forms was 1 inch. The details of the centering used in erecting one of the 106-foot 8-inch spans of a reinforced-concrete bridge over the Tuscarawas River at Canal Dover, Ohio, are shown in Figs. 171a and 171b. Besides this span, the bridge consisted of two other spans of 106 feet 8 inches each, and a canal span of 70 feet. The centering for the canal span was built in six bents, each bent having seven concrete piles.

Are You in Taunton Massachusetts? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 781-519-2456

We Service Taunton MA and all surrounding Cities & Towns