Construction sequence Arch bridge

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workflow on roman bridge @ limyra: falsework moved opening lower arch rib had been completed



where arches founded in watercourse bed (on piers or banks) water diverted gravel can first excavated , replaced footing (of strong material). these, foundation piers erected/raised height of intended base of arches, point known springing.
falsework centering (in british english: arch frame) fabricated, typically timbers , boards. since each arch of multi-arch bridge impose thrust upon neighbors, necessary either arches of bridge raised @ same time, or wide piers used. thrust end arches taken earth substantial (vertical) footings @ canyon walls, or large inclined planes forming in sense ramps bridge, may formed of arches.
the several arches (or single arch is) constructed on centering. once each basic arch barrel constructed, arches (or arch is) stabilized infill masonry above, may laid in horizontal running bond courses (layers). these may form 2 outer walls, known spandrels, infilled appropriate loose material , rubble.
the road paved , parapet walls protectively confine traffic bridge.






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