Bridges are used to span gaps of different lengths and sizes. The various kinds of bridges include suspension bridges, arch bridges and beam bridges. Suspension bridges are designed to span the largest of gaps; beam bridges are designed to only span the shortest of gaps. An example of a suspension bridge is the Golden Gate Bridge in San Francisco, Calif. An example of a beam bridge is a wooden log placed over a small creek.
Things You'll Need
- Two 4-feet x 6-inch x 6-inch wooden blocks
- Eight 2-feet x 6-inch wooden planks
- Powered miter saw
- 32 nails
Cut two thick wooden blocks so that they are long enough to go across the gap you want to span with your bridge. For example, if you are trying to span a 2-foot gap that is part of a garden pond, or a small creek, cut the blocks so that they are about 4 feet long by about 6 inches wide and 6 inches thick. Use a powered miter saw to make the cuts. These will be the beam of your simple beam bridge.
Cut eight wooden planks so that they are 2 feet long by 6 inches wide. These will be the planks for your simple beam bridge.
Place the two beams 2 feet apart from each other, running parallel to each other.
Attach one of the 2 x 1/2-foot planks to the edge of the two beams so that the edges of the plank are flush with the outer edges of the beams. The plank should be perpendicular to the two beams. Hammer in two nails on each side to attach the plank to the beams.
Attach another 2 x 1/2-foot planks to the beams, flush with the first 2 x 1/2-foot plank, in the same way in which you attached the first plank. Repeat this step until you have attached all eight of the planks to the beams.
Place the beam bridge over the gap you are looking to span. The bridge should not be too heavy to easily lift and maneuver over the gap.
- Photo Credit sunny waterfall, lazarevskoe, sochi, russia image by Denis Babenko from Fotolia.com
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