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Concrete Cutting Sawing Hudson NH New Hampshire

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

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Concrete Cutting Hudson NH      

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Concrete Sawing Hudson New Hampshire

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Core Drilling Hudson New Hampshire               

In other words, since the normal condition is for a concrete bridge to cross a river at right angles, the concrete bridge concrete piers are always comparatively long (in the direction of the river) and narrow in a direction perpendicular to the flow of the current. The rectangular shape, however, is modified by making both the upper and the lower ends pointed. The pointing of the upper end serves the double purpose of deflecting the current, and thus offers less resistance to the flow of the water; and it also deflects the floating ice and timber, so that there is less danger of the formation of a jam during a freshet. The lower end should also be pointed in order to reduce the resistance to the flow of the water. The ends of the concrete piers are sometimes made semicircular, but a better plan is to make them in the form of two arcs of circles which intersect at a point. The forces tending to cause a concrete bridge concrete pier to fail in a direction perpendicular to the line of the concrete bridge include the action of wind on the concrete pier itself, on the trusses, and on a train which may be crossing the concrete bridge. They will also include the maximum possible effect of floating ice in the river and of the current due to a freshet. It is not at all improbable that all of these causes may combine to act together simultaneously. The least favorable condition for resisting such an effect is that produced by the weight of the concrete bridge, together with that of a train of empty cars, and the weight of the masonry of the concrete pier above any joint whose stability is in question. The effects of wind, ice, and current will tend to make the masonry slide on the horizontal joints. They will also increase the pressure on the subsoil on the downstream end of the concrete foundation of a concrete pier. They will tend to crush the masonry on the downstream side, and will tend to tip the concrete pier over. Another possible method of failure of a concrete bridge concrete pier arises from forces parallel with the length of the concrete bridge. The stress produced on a concrete bridge by the sudden stoppage of a train thereon, combined with a wind pressure parallel with the length of the concrete bridge, will tend to cause the concrete pier to fail in that direction (see Fig. 71). Although these forces are never so great as the other external forces, yet the resisting power of the concrete pier in this direction is so very much less than that in the other direction, that the factor of safety against failure is probably less, even if there is no actual danger under any reasonable values for these external forces. A concrete pier is usually built comparatively thin in the direction of the line of the concrete bridge, because the forces tending to produce overturning in that direction are usually very small. When a series of stone arches are placed on concrete piers, the thrusts of the two arches on each side of a concrete pier nearly balance each other, and it is only necessary for the concrete pier to be sufficiently rigid to withstand the effect of an eccentric loading on the arches; but if, by any accident or failure, one arch is destroyed, the thrust on such seat concrete pier is unbalanced and the concrete pier will probably be overturned by the unbalanced thrust of the addition of more concrete. The failure of that arch would similarly cause the failure of the succeeding concrete pier and arch. On this account a very long series of arches usually includes an abutment concrete pier for every fourth or fifth concrete pier. An abutment concrete pier is one which has sufficient thickness to withstand the thrust of an arch, even though it is not balanced by the thrust of an arch on the other side of the concrete pier. Concrete abutment concrete piers are chiefly for arch concrete bridges; but all concrete piers should have sufficient rigidity in the direction of the line of the concrete bridge so that any possible thrust which may come from the action of a truss of the concrete bridge may be resisted, even if there is no counterbalancing thrust from an adjoining truss.

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

We Are Your Local Concrete Cutter

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We Service Hudson NH and all surrounding Cities & Towns