English to French Tech/Engineering Mechanics / Mech Engineering Ponts

If built over water, the water is diverted in the watercourse bed in order for the gravel to be replaced by a strong material.
Arch barrels are built and filled with rubble.
2.
The abutments are erected to the base of the arches (springing).
5.
A road or railway line is built on the bridge.
3.
The arch frames are built.
They are either raised at the same time or individually if the abutments are wide enough.
6.
Parapet walls are built to protect bridge traffic.


* I am trying to find a glossary EN/FR