Concrete Cutting Coring Barre MA Mass Massachusetts

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For flat segmental concrete arches, or even for elliptical concrete arches where the concrete arch is very much thickened at each end so that the virtual concrete abutment of the concrete arch is at a considerable distance above the nominal springing line, such a method is sufficiently accurate, and it has the advantage of simplicity of computation; but where the concrete arch has a very considerable rise in comparison with its span, the pressure on the extrados, which is presumably perpendicular to the concrete surface of the extrados, has such a large horizontal component that the horizontal forces cannot be ignored. The method of determining the amount and direction of the force acting on each concrete, is illustrated. The reduced load line, found as previously described, is indicated in the figure. A trapezoid represents the loading resting on the concrete ac. The line represents, at some scale, the amount of this vertical loading. Drawing the line de perpendicular to the extrados ac, we may complete the rectangle on the line, and obtain the horizontal component, while the equivalent normal pressure on the concrete is represented by de. Drawing a vertical line through the center of gravity of the concrete, and producing it (if necessary) until it intersects at the point v, we may lay off to represent, at the same scale, the weight of the concrete.

Making the line equal to de, we find the variable as the resultant of the forces; and it therefore measures, according to the scale chosen, the amount and direction of the resultant of the forces acting on that concrete. Although the figure apparently shows the line de as though it passed through the center of gravity of the concrete, and although it generally will do so very nearly, it should be remembered that de does not necessarily pass through the center of gravity of the concrete. A practical graphical method of lying off the line to represent the actual resultant force is as follows: The reduced load line, drawn as previously described, gives the line for a loading of solid stone, which would be the equivalent of the actual load line. If this loading has a unit-value of, say, 160 pounds per cubic foot, and if the horizontal distance is made 2 feet for the load over each concrete , then each foot of height (at the same scale at which represents 2 feet) of the line represents 320 pounds of loading. If the concrete were actually a rectangle, then its area would be equal to that of the dotted parallelogram vertically under ac, and its area would equal and in such a case, would represent the weight of that concrete and the force could be scaled directly equal to the center, without further computation. The accuracy of this method, of course, depends on the equality of the dotted triangle below c and that below a. For concrete which are near the crown of the concrete arch, the error involved by this method is probably within the general accuracy of other determinations of weight; but near the concrete abutment of a full-centered concrete arch, the inaccuracy would be too treat to be tolerated, and the area of the concrete  should be actually computed.

We shall therefore draw the extrados with a radius of 20 feet, the center point being determined by measuring 20 feet down from the top of the keystone. We shall likewise assume that this concrete arch is one of a series resting on piers which are 4 feet thick at the springing line. By drawing a portion of the adjoining concrete arch, we find that its extrados intersects the extrados of the concrete arch considered at a point about 7 feet 6 inches above the pier. By drawing a line from this point toward the center for joints, which is about midway between the center for the extrados and the center for the intrados, we have the line for the joint which is virtually the skewback joint and the concrete abutment of the concrete arch. The center of the pier is precisely 17 feet from the center of the concrete arch.

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

We Are Your Local Concrete Cutting Company

Call 508-283-3135

We Service all surrounding Cities & Towns.