Roman Bridge Pier
The
Romans were able to use concrete to develop piers for bridges.
Builders drove long pieces of wood into a river bottom in two circles.
They then laced wicker between the pieces of wood and filled the space in between with clay.
After this temporary wall was built, the water would be bailed out of the center and the river bottom would be dug out till they reached firm ground. They would then pour concrete into the area. They then had a pier to Support a bridge in the river.
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