Bridges classifications(According to courses from "Public Works' Special School of Paris" - Teachers : Mr Deloupe et Honoré 1939)
Depending on the point of view of their importance , Bridges are subdivided into:
"Culverts,"
bridges , viaducts
and
aqueducts.
- A"culvert
"
is a very small arch bridge
of less 4m of opening, comprising only two supports
and usually built on a small ravine, a brook etc. -A
bridge is a work sometimes very important, but
having for object the crossing of only one obstacle (river, railway,
road...) They can be classified in the following way:
- Fixed bridges, allowing a continuous circulation.
- The moving bridges (swinging or travelling or lifting...), established at a given point in order to be able to stop circulation temporarily, to be able to leave passage to the boats, trains or other vehicles, according to the nature of the way crossed by these bridges .
-- the "flying bridges" which one can move at will...
- A
viaduct is a structure sometimes considerable,
composed of arches or spans many and raised, sometimes on several stages of
vaults, and intended to cross great spaces, valleys, large ravines etc -An
aqueduct is a work of weak opening, which is
used only in the passing of water. According to
whether one considers them from the point of view of the nature
of the ways to which they give access, one divides them into:
Highway-bridges,
passage of ways, roads and motorways...
Railway
bridges, intended for the passages of superior, railroad or inferior
according to whether the served way passes to the top or the lower part of
the railway...
Bridges
channels and aqueducts, when a work must
give passage to derived or collected water...
- Because of the nature of the
materials which constitute them, the bridges can be divided into:
Stone bridges
and masonry
Wood bridges
Metal bridges
Concrete bridges
Bridges
out of composite materials...
...Lastly, relative with their form, the
bridges are still called
Straight-bridges
"Oblique
bridges
Arch bridges
Suspension bridges
Cable stayed bridges
Beam bridges
mixed etc.
Amazing picture, showing
three different bridges near Disentis- Switzerland .
(Postcard- phot. Decurtins, ed E.Seglio-Monn)
Highway-bridges:
Shimanani sea side Highway Japan 1998
My classification was carried out primarily according
to the types of representations met on the stamps and philatelic documents
found with the wire of my research. Consequently It borrows a little
from each one of these classifications, in a strict didactic preoccupation
of clearness and balance...
References of the stamps: The
majority correspond to N° of the French catalogue Yvert and Tellier
(Yt)
but also with the American catalogue Scott (Sc)
and also with the German catalogue Michel (Michel)
Rebuilding of the
Mostar Bridge 2004
