
Germans
in France - St. Quentin cathedral Germans
in France 
Reims
cathedral
Cambrai
cathedral 
Soissons
cathedral
Arras
cathedral 
Gustave
Eiffel’s first work: the Eiffel passerelle, Bordeaux

a
dream unfulfilled - the transporter bridge [pont transbordeur],
Bordeaux 
a
fifth bridge coming to Bordeaux: pont Bacalan-Bastide,
a new vertical lift bridge 
the
6th bridge at Rouen: Pont Gustave Flaubert,
new vertical lift bridge
Ile
de France, Paris: in the context of Abelard and of French
cathedrals 
France’s
western isles: Ile de Ré
France’s
western iles: Ile d’Oleron
on
first arriving in France - driving
France
is not England

Marianne
- a French national symbol, with French definitive stamps
the
calendar of the French Revolution
la
belle époque 
Grand
Palais, Paris


Pic
du Midi - observing stars clearly, A64 
Carcassonne,
A61: world heritage fortified city 
Futuroscope
Vulcania
Space
City, Toulouse
the
French umbrella & Aurillac
50
years old:
Citroën DS
the
Citroën 2CV:
a
French motoring icon
the
forest as seen by francois mauriac, and today 
places
and playtime 
roundabout
art of Les Landes
Hermès scarves

bastide towns
mardi gras! carnival in Basque country
what a hair
cut! m & french pop/rock
country
life in France: the poultry fair

short
biography of Pierre (Peter) Abelard |
14 October 2010: The
271-metre high and 579-metre long Hoover
Dam Canyon Bridge is dedicated and opened to traffic.
The Hoover
or Boulder Dam, when it opened in 1935 included a
scenic route to cross from one side of the dam to the
other, from Nevada to Arizona or visa versa, by a road
along the top of the dam.
Over
the decades, this narrow, two-lane road and its hairpin
approach roads has become a bottleneck and safety hazard,
so a solution had to be found. To compound the problems,
multiple check points were placed on the road after the
terrorist attacks of 9-11 in 2001.
This has resulted in another spectacular construction
project, the dam itself being the first.
Officially titled the Mike O’Callaghan-Pat
Tilman Memorial Bridge, this bridge is also known as the
Hoover Dam Bypass, or the Colorado River Bridge. Regarding
the other proposed name for this bridge, Mike O’Callagan
was an Army veteran and the 23rd Governor of Nevada, while
Pat Tillman was a former NFL player and Army veteran.
constructing
the hoover dam bridge
Under
construction, the twin concrete arch sections being supported
by cable stays.
Photo:
hooverdambypass.org

The twin-rib arches almost completed,
but still supported by cable stays.
Photo: FHWA/CFLHD
Although the roadbed of this bridge will be supported
by a twin-rib arch, it started life as a cable-stayed
suspension bridge - the concrete sections of the bridge
being supported by cable stays from temporary pylons until
the twin-rib arch was completed and self-supporting.

The supporting stays removed and
the supports for the roadbad being added.
Photo: FHWA/CFLHD

The new Hoover Dam bridge, or Mike
O’'Callaghan-Pat Tilman Memorial Bridge, in July
2010. Photo: Hoover
Dam Bypass Project

Google satellite image, showing the
road bed being laid on the new Hoover Dam bridge.

artist’s impression of the
completed bridge. Image: Nevada Dept of Transportation
structural
statistics and other interesting facts
-
- bridge type: composite concrete deck arch bridge
- arch: concrete in compression, placed using a
form traveler system
upper structure: steel
twin arch ribs connected by steel struts
- height above Colorado river: 890 ft/271 m
- total length: 1,900 ft/579 m
- arch span: 1,060 ft/323 m
- bridge arch rise: 277 ft/84.5 m
-
- twin-rib arch:
- •106 pieces—53 per arch—mostly
cast-in-place 24 ft/7.3 m at a time, using a temporary
form traveler system
- • last section placed in position on 10
August 2009
• stay removal completed on 27 August 2009,
the arch then being self-supporting
- length of Hoover Dam Bypass: 3.5 miles
- road : four lanes
- roadbed support: eight vertical steel piers supporting
thirty six, 50-ton steel girders
- estimated traffic load: 17,000 trucks and cars daily
- location relative to the Hoover Dam: approx. 1,500
feet south
- consruction started: 2005
- predicted opening date: September 2010
- bypass open for traffic: November 2010
- cost: $240 million
- master design: HDR Engineering, Inc.
- bridgedesign: T. Y. Lin International
- approach design: Sverdrup Civil, Inc
- There is no toll for this new bypass road and bridge
-
- the bridge components include:
- • 16,000,000 pounds of steel
- • 30,000 cubic yards of concrete
• 2,000,000 yards of cable
other amazing bridges:
Highest,
longest : the Viaduct de Millau
the
6th bridge at Rouen: Pont Gustave Flaubert, new vertical
lift bridge
Pont Bacalan-Bastide Bordeaux, a new vertical lift bridge
Gustave
Eiffel’s first work: the Eiffel passerelle, Bordeaux
transborder
bridges around the world
- Some reference keywords/tags:
-
end
notes
- The Hoover Dam holds back water
in Lake Mead. The lake is is 110 miles long and took
six years to fill.
There was much debate over the name for this dam as
it was built. Other suggested names were Black Canyon
Dam, Boulder Dam and Boulder Canyon Dam. The dam’s
name was changed definitively in 1947.
The Herbert Hoover administration changed the name from
Boulder Dam to Hoover Dam in 1930 as a political move.
In 1933, the Franklin Roosevelt administration changed
it back to Boulder Dam, and under Harry Truman, the
permanent name of Hoover Dam was restored.

- Some reference keywords/tags:
- Boulder Dam,Black Canyon Dam,Mike O'Callaghan-Pat
Tilman Memorial Bridge,composite concrete deck arch
bridge,cable-stayed suspension,Hoover Dam Canyon Bridge,Nevada,Arizona,Hoover
Dam,twin-rib concrete arch
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