Whether they span a body of water or grace the overhead of an entry, arches are an architecturally sophisticated element that is pleasing to the eye. If you want a refined addition to your home or yard, consider adding an arched wall or an arched entrance to the yard.
Build the sides of the wall out of cement blocks, to the desired height. Be sure to add metal ties to each wall for strength as you build.
Place a couple pieces of rebar between the rows of block, as you get to the top of the opening. Allow this rebar to stick out into the opening. You will be covering these rods with cement to build the arch.
Place a steel beam across the opening and continue to build the wall across the top of the opening to the desired height, joining the two walls together.
Rough out the arch shape with concrete. Keep adding concrete, until you get the arch spans to the size and shape you like. Cover the rebar and the steel beam completely using concrete. Allow to dry completely.
Cover the entire wall, including the arch, with a layer of chicken wire. Use plaster or stucco to cover the chicken wire and to give your arch a finished, timeless look.
To be aesthetically correct, the rise of the arch should be equal to 1/12 the span. For example, you need a four-inch rise for a four-foot opening.