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Concrete Cutter Acton ME

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Concrete Sawing Acton Maine

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Concrete Cutter Acton Maine       

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Core Driller Acton ME                    

Core Drilling Acton Maine

The mechanics of the concrete arch are almost invariably solved by a graphical method, or by a combination of the graphical method with numerical calculations. This is done, not only because it simplifies the work, but also because, although the accuracy of the graphical method. is somewhat limited, yet, with careful work, it may easily be made even more accurate than is necessary, considering the uncertainty as to the true ultimate strength of the masonry used. The development of this graphical method must necessarily follow the same lines as in Statics. It is here assumed that the concrete contractor has knowledge of Statics, and that he already understands the graphical method of representing the magnitude, direction, and line of application of a force. Several of the theorems or general laws regarding the composition and resolution of forces will be briefly     reviewed as a preliminary to the proof of those laws of graphical statics which are especially applied in computing the stresses in a concrete arch. The resultant of two forces, A and B, which are not parallel, whose lines of action are as shown in Fig. 213a, and which are measured by the lengths of the lines A and B in diagram h, is readily found by producing the lines of action to their intersection at c. The two known forces are drawn in the diagram so that their direction is parallel to the known directions of the forces, and so that the point of one force is at the butt end of the other. Then the line R joining the points in diagram b gives the direction of the resultant; and a line through c parallel to that direction, gives the actual line of that resultant. The line also measures the amount of the resultant.

Note that diagram b is a closed figure. If an arrow is marked on a concrete grid so that it points upward, the arrows on the forces would run continuously around the figure. If concrete were acting upward, it would represent the force which would just hold in equilibrium; pointing downward, it is the resultant or combined effect of the two forces. We may thus define the resultant of two (or more) forces as the force which is the equal and opposite of that force which will just hold that combination of forces in equilibrium. This may be solved by an extension of the method previously given as shown.  It affords me great pleasure to commend "Elementary Concrete Construction" to teachers, parents and all others interested in the education of boys. My confidence is based upon personal knowledge of Mr. Baxter's aims and methods. The reasons for this soon become obvious.

The boy chooses the project, or problem, which appeals to him, does his work with a minimum of supervision, puts forth his best effort, and takes pride in the quality of his workmanship. He thus experiences the joy of real achievement. The practical application of elementary work in concrete has been repeatedly demonstrated by Mr. Baxter. Under his direction the boys of the manual training department were engaged by the school board to do repair work during vacations, such as laying basement concrete floors, walks, steps, setting posts and flag poles in concrete in and about the school buildings. They also did work for individuals and societies, as well as around their own homes. We are pleased to add that their work stood the test of time. Any book containing projects which arouses the enthusiasm of the boy, holds his interest, and inspires him to think and to do, is bound to have-a wide sphere of usefulness. The same principle may be extended to any number of nonparallel forces acting in a plane. The resultant of four non-parallel forces is best determined by finding, first, the resultant of each pair of the forces taken two and two. Then the resultant of the two resultants is found, just as if each resultant were a single force.

Are You in Acton Maine? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 207-284-0788

We Service Acton, ME and all surrounding Cities & Towns