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Concrete Cutting Sawing Chester NH New Hampshire

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“We Specialize in Cutting Doorways and Windows in Concrete Foundations”

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Concrete Cutting Chester NH      

Concrete Cutter Chester NH        

Concrete Coring Chester NH       

Core Drilling Chester NH              

Concrete Sawing Chester NH

Concrete Sawing Chester New Hampshire

Concrete Cutting Chester New Hampshire       

Concrete Cutter Chester New Hampshire         

Concrete Coring New Hampshire           

Core Driller Chester NH                

Core Drilling Chester New Hampshire               

We core drill perfectly round holes and offer coring in Chester, NH.

When a very soft soil extends to a depth of several feet, concrete piles are usually driven at uniform distances over the area, and a grillage is constructed on top of the concrete piles. This method of constructing a foundation is discussed in the section on "Concrete piles." The three requirements of a footing course are:

(1) That the area shall be such that the total load divided by the area shall not be greater than the allowable unit-pressure on the subsoil.

(2) That the line of pressure of the concrete wall (or pier) shall be directly over the center of gravity (and hence the center of upward pressure) of the base of the footings.

(3) That the footing shall have sufficient structural strength so that it can distribute the load uniformly over the subsoil. When it has been determined with sufficient accuracy how much pressure per square foot may be allowed on the subsoil and when the total load of the structure has been computed, it is a very simple matter to compute the width of continuous footings or the area of column footings. The second requirement is very easily fulfilled when it is possible to spread the footings in all directions as desired, as shown in Fig. 43. A common exception occurs when putting up a building which entirely covers the width of the lot. The walls are on the building line; the footings can expand inward only. The lines of pressure do not coincide, as shown in Fig. 40. A construction as shown in the figure will almost inevitably result in cracks in the building, unless some special device is adopted to prevent them. One general method is to introduce a tie of sufficient strength from the concrete.  The other general method is to introduce cantilever concrete beams under the basement, which either extend clear across the building or else carry the load of interior columns so that the center of gravity of the combined loads will coincide with the central pressure line of the upward pressure of the footings.

The third requirement practically means that the thickness of the footing (be, Fig. 41) shall be great enough so that the footing can resist the transverse stresses caused by the pressure of the subsoil on the area between c and d. When the thickness must be made very great on account of the wide offset, material may be saved by cutting out the rectangle e k m 1. The thickness m o is computed for the offset y o, just as in the first case; while the thickness k m of the second layer may be computed from the offset k J. Where the footings are made of stone or of plain concrete, whose transverse strength is always low, the offsets are necessarily small; but when using timber, reinforced concrete, or steel I-concrete beams, the offsets may be very wide in comparison with the depth of the footing. The method of calculation is to consider the offset of the footing as an inverted cantilever which is loaded with the calculated upward pressure of the subsoil against the footing. If Fig. 41 is turned upside down, the resemblance to the ordinary loaded cantilever will be more readily apparent. Considering a unit-length (1) of the concrete wall and the amount of the offset o (= d c in Fig. 41), and calling P the unit-pressure from the subsoil, we have P o 1 as the pressure on that area, and its lever-arm about the point c is I o. Therefore its moment = P o2 1. If t represents the thickness b c of the footing, the moment of resistance of that section = R1t2, in which R = the unit-compression (or unit-tension) in the section. We therefore have the equation: The fraction is the ratio of the offset to its thickness. The solution of the above equation, using what are considered to be conservatively safe values for R for various grades of stone and concrete, is given in equal forms. The load on a concrete wall has been computed as 19,000 pounds per running foot of the wall, which has a thickness of 18 inches just above the footing.

Are You in Chester New Hampshire? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 603-622-4441

We Service Chester NH and all surrounding Cities & Towns