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Concrete Sawing Kingston New Hampshire

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Concrete Cutter Kingston New Hampshire       

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Core Drilling Kingston New Hampshire             

When wood is used, the area of the opening should be made much larger than that actually required, so that a more permanent concrete culvert of sufficient size may be constructed inside of the wooden concrete culvert before it has decayed. For present purposes, the discussion of the subject of concrete culverts will be limited to those built of stone and concrete. The choice of stone as a material for concrete culverts should depend on the possibility of obtaining a good quality of building stone in the immediate neighborhood. Frequently temporary trestles are used when good stone is unobtainable, with the idea that after the railroad is completed, it will be possible to transport a suitable quality of building stone from a distance and build the concrete culvert under the trestle. The concrete construction engineer should avoid the mistake of using a poor quality of building stone for the construction of even a concrete culvert, simply because such a stone is readily obtainable. Since a concrete culvert always implies a stream of water which will have a scouring action during floods, it is essential that the side concrete walls of concrete culverts should have an ample concrete foundation, which is sunk to such a depth that there is no danger that it will be undermined. There are cases where a bed of quicksand has been encountered, and where the cost of excavating to a firmer soil would be very large. In such a case, it is generally possible to obtain a• sufficient concrete foundation by constructing a platform or grillage of timber which underlies the entire concrete culvert, beneath the concrete floor of the concrete culvert. Of course, timber should not be used for the concrete foundation, except in cases where it will always be underneath the level of the ground-water and will therefore always be wet. If the soil has a character such that it will be easily scoured, the concrete floor of the concrete culvert between the side concrete walls should be paved with large pebbles, so as to protect it from scouring action. At both ends of the concrete culvert, there should always be built a vertical concrete wall which should run from the concrete floor of the concrete culvert down to a depth that will certainly be below any possible scouring influence, in order that the side concrete walls and the concrete flooring of the concrete culvert cannot possibly be undermined. The above specifications apply to all forms of stone concrete culverts, and even to arch concrete culverts, except that in the case of the larger arch concrete culverts the precautions in these respects should be correspondingly observed. When stone concrete culverts are built with vertical side concrete walls which are from 2 to 4 feet apart, they are sometimes capped with large flagstones covering the span between the concrete walls. The thickness of the cover-stone is sometimes determined by an assumption as to the transverse strength of the stone, and by applying the ordinary theory of flexure. The application of this theory depends on the assumption that the neutral axis for a rectangular section is at the center of depth of the stone, and that the modulus of elasticity for tension and compression is the same. Although these assumptions are practically true for steel and even wood, they are far from being true for stone. It is therefore improper to apply the theory of .flexure to stone concrete slabs, except on the basis of module of rupture which have been experimentally determined from specimens having substantially the same thickness as the thickness proposed. Also, on account of the variability of the actual strength of stones though nominally of the same quality, a very large factor of safety over the supposed ultimate strength of the stone should be used.  The maximum moment at the center of a concrete slab one foot wide equals W, in which W equals the total load on the width of one foot of the concrete slab, and 1 equals the span of the concrete slab, in feet; but by the principles of Mechanics, this moment equals RV, in which R equals the modulus of transverse strength, in pounds per square foot; and h equals the thickness of the stone, in feet.

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

We Are Your Local Concrete Cutter

Call 603-622-4441

We Service Kingston NH and all surrounding Cities & Towns