|Owner||Réseau Ferré de France - RFF| |Design||G Eiffel, M
Koechlin, L Boyer| |Where||South of France| |Latitude||N 44 58'
25"| |Longitude||E 03 10' 25"| |Why||Crosses River Truyere
linking railway between Clemont-Ferand and Beziers| |Overall
type||Arch Truss with 2 hinges| |Main span||165 m.| |Rise of
arch||52 m.| |Height of rail track above river level||122
m.||Materials||Wrought iron| |Erection||The arch was built out
from both sides using a 'semi-arch' method. Cranes, at the end
of each growing section of arch, worked on extending the arch
piece by piece. The ends were held in place by back stays to the
towers. In turn the towers were also held by back stays to the
rest of the bridge and the ground. Eventually the two halves of
the arch were joined and the stays removed. The deck girders
were launched out onto the arch from both ends.| |How to read a
bridge||Read more about trusses..... Read more about modern
arches..... Read more about the book metaphor.....