This is crucial because as load is applied to the top of the bridge, these stones are compressed into each other horizontally, locking them together and supporting the load of the bridge. This bridge will collapse because it has only the shear resistance of the blocks keeping it up over the arch.įigure 2 shows a bridge that is supported by an arch of stones, each of which is parallel to the radius of the imaginary circle that is an extension of your arc. 1 and fig 2:įigure 1 shows a bridge that is basically just a block wall that someone cut a hole out of. The way we do that is by creating an arch of squared off rocks that all run parallel to the radius of your arch. Stone has poor tensile and shear force resistance, but excellent compressive resistance: Like 28,000 pounds/sq. Stone bridges all have arches supporting them. and you'll need a bunch, depending on your project size.)ġ0) Basic concrete tools: a trowel $5, a shovel$12, and if you want, a grouting bag $5ġ1) Concrete for the bridge foundation ($100-$150 a ton if delivered by a truck) They are your bread and butter.) ($10 for a pack )ĩ) Mortar ($5/ bag. This will be the most expensive, but you will save a ton of time cutting stone.)Ģ) Household Tools: A hammer (preferably 2 or 3 pound in weight with a beveled end), a shovel, a drill, a circular saw, screws.)ģ) Masonry chisels: (at least one 3" wide and one 1.5" wide) ($10/ea)Ĥ) A rotary hammer drill with 9/16 bit (for drilling holes used to split stone I got mine at Harbor Freight for $80)ħ) 3/4" Plywood, 1/4" plywood, 2圆 boards ($100-$150)Ĩ) Plug and feathers (also called wedge and feather: by far the most specialty item, but available online. A third option is to buy pre-cut landscaping stone from a landscaping supply company.
Shot rock, purchased at your local quarry will take more time to cut, but will also work great. Preferably, use whatever stone you have on the property! It will look great and give you immense satisfaction to see your project built out of stone native to your land. The bridge I built spans roughly 10 ft and I probably used 5 tons of stone, harvested from the stream and the surrounding hillside. Assuming you have the household tools already, you're looking at $400-$800 in suppliesġ) Tons of stone (Like seriously, TONS. Much of this stuff is common household tools/supplies, but if you don't already have it, all can be purchased at your local hardware store (possible exception would be plug and feather which can be purchased on.
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