## 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.**