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Concrete Cutter Hollis NH

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Concrete Sawing Hollis New Hampshire

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Concrete Cutter Hollis New Hampshire 

Concrete Coring New Hampshire           

Core Driller Hollis NH                    

Core Drilling Hollis New Hampshire                   

We perform concrete cutting, core drilling and coring in Hollis New Hampshire.

The recognition of this principle has sometimes resulted in designing retaining concrete walls on the principle illustrated in Fig. 69, which is somewhat similar to a. section of an arch set on end. Such curved outlines, of course, are more expensive, and are sometimes inconvenient, and for that reason are but seldom adopted. A detail which is frequently adopted in the design of retaining concrete walls is to use what is virtually a batter to the rear face of the concrete wall, but to accomplish this by a series of steps on the rear of the concrete wall. This not only permits the use of rectangular concrete blocks of stone and the employment of vertical joints, but also adds considerably to the stability of the concrete wall, since the vertical pressure of the earth on the horizontal steps adds considerably to the resistance to overturning. In Fig. 70 is shown a design for a retaining concrete wall made to support a railway embankment in a location where the natural surface was so steep that the embankment would not readily obtain sufficient support. Although this use of a retaining concrete wall is somewhat special, the general outline of the design not only conforms to the standards on that railroad, but represents good practice and is an illustration of many of the points referred to above. It should be noted that in this case the total width of the base of the concrete wall is nearly one-half the height. The outline design of a long concrete bridge which requires several spans, involves many considerations: (1) if the river is navigable, at least one deep and wide channel must be left for navigation. The placing of concrete piers, the clear height of the spans above high water, and the general plans of all concrete bridges over navigable rivers, is subject to the approval of the United States Government. (2) A long concrete bridge always requires a solution of the general question of few concrete piers and long spans, or more concrete piers and shorter spans. No general solution of the question is possible, since it depends on the required clear height of the spans above the water, on the required depth below the water for a suitable concrete foundation, and on several other conditions (such as swift current, etc.) which would influence the relative cost of additional concrete piers or longer spans. Each case must be decided according to the particular circumstances of the case. (3) Even the general location of the line of the concrete bridge is often determined by a careful comparison, not only of several plans for a given crossing, but even a comparison of the plans for several locations. The requirements for the concrete bridge seats for the ends of the two spans resting on a concrete pier are usually such that a concrete pier with a top as large as thus required, and with a proper batter to the faces, will have all the strength necessary for the external forces acting on the concrete pier. For example, the channel concrete pier of one of the large railroad concrete bridges crossing the Mississippi River was capped by a course of stonework 14 feet wide and 29 feet long, besides two semicircles with a radius of 7 feet. The footing of this concrete pier was 30 feet wide by 70 feet long, and the total height from subsoil to top was about 170 feet. This concrete pier, of course, was unusually large. For trusses of shorter span, the concrete bridge seats are correspondingly smaller. The elements which affect stability are so easily computed that it is always proper, as a matter of precaution, to test every concrete pier designed to fulfill the other usual requirements to see whether it is certainly safe against certain possible methods of failure. This is especially true when the concrete piers are unusually high. The requirements for supporting the truss are, fortunately, just such as give the concrete pier the most favorable formation so that it offers the least obstruction to the flow of the current in the river.

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

We Are Your Local Concrete Cutter

Call 603-622-4441

We Service Hollis NH and all surrounding Cities & Towns