I doubt you'll be able to conjure up this magic, but perhaps your drive and determination will prove me wrong. Don't underestimate the great skills the master stone masons employed to build the bridge you saw.
You'll have a much easier time if you employ cement mortar as part of the project. All you have to do is draw the concentric arcs of the underside and topside of the bridge on the cardboard and then draw in the lines that represent the joints between each of the stones. You can determine the actual shape and angles of the trapezoids by making a scale drawing on a large sheet of cardboard. They'll not be simple rectangles like a normal brick. Photo Credit: Tim Carterīecause the stone arch is three-dimensional, the stones you cut will end up being trapezoidal in shape when you look at the sides. You can build a smaller version for foot and pony traffic. This bridge in southwest New Hampshire used to carry car and truck traffic. Fine-grained granite is the easiest to work with as you can get it to split creating a quite smooth face. Granite is such a stone and was used for the bridge you saw on your trip. You need to use very strong stone that will not crumble. To achieve success, you must take your time and cut the stones so they fit tightly against one another. The short answer is you can build a small version of a dry-laid stone arch bridge. Some of these stone arches have survived for nearly 2,000 years. These bridges rival the stone arched aqueducts built by the Romans. There are several of these dry-laid stone arch bridges in this part of New Hampshire, most built between 1835 and the 1850's.
Is this a crazy idea and even possible? What are the steps I need to take to get started? What's the biggest mistake that will lead to the collapse of the bridge? How much weight do you think it could support? Ann L., North Bend, OHĭEAR ANN: You may think I'm nuts, but I believe I know the exact bridge you saw! It's on Route 9 near Hillsborough, NH. It was so stunning I want to construct a much smaller version in my yard. The historical marker sign said that no mortar was used in the construction. Bridge Design, Planning, and Construction Outdoor | Outdoor Projects | Stone text: Tim CarterĭEAR TIM: I was traveling on a fall foliage road trip in southwest New Hampshire and saw a gorgeous double-arch bridge.
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