the millau viaduct by anurag das
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MILLAU
VIADUCT
MILLAU
VIADUCT
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The Millau Viaduct is a cable-stayed bridge that spans the
valley of the iver Tarnnear Millau insouthern !rance "
It is the #$th highest bridgedec% in the &orld"
It &as built to reduce tra'c
of s(all to&n Millau as the
I+T,DUCTI,+
The Millau Viaduct is a cable-stayed bridge that spans thevalley of the iver Tarnnear Millau in southern !rance"It has the #$th highest bridge
dec% in the &orld"
It &as built to reduce tra'c of
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MA, .+/I+..I+/
C0ALL.+/.*
#1 2UILD T0. TALL.*T 2ID/.)I.* I+ T0. 3,LD"
$1 )UT 45666 T,+ !..3A7 ,+
T,) ,! IT"
41 ..CT 8 *T..L )7L,+*
0U+D.D* ,! M.T. A2,V. T0.
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*).CI!ICATI,+*
MILLAU VIADUCTCrosses 9 iver Tarn
Design 9 Cable-stayedbridge
Total length 9 $": %( long
3idth 9 4$ (Longest span 9 4;$ (
0ighest pier 9 $;: (
Curved radius 9 constant $6 %(
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Construction of
piers
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.ach pier is treated as a&or%site in its o&n right sothat construction of all the
seven bridges can ta%e placeindependently"
The geo(etry of the piers
varies fro( one pouring stepto the follo&ing pouring stepand is tapering entire &ay
up"
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The shape of the (ould &aschanged at every ;( height
to
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The installation of the dec%
by successive launchingoperations re>uires theerection of 8 te(porarypiers"
These piers consists of a(etal fra(e&or% of a s>uaresection of #$(?#$( &hose(e(bers are tubes of#@6#5(( dia(eter"
They introduced this piersbet&een the t&o pillers asthe span bet&een the t&opiers &as large and dec%
could not support itself"
Te(porary piers
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*teel Dec%sThey opted for steeldec% over theconventional concretebloc%@as it is notecono(ical and safeto lift concrete oversuch heights"
!abrication of thedec% section &as donein steel factory "Around $$66
sections each
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Launching the
dec%8 te(porarypiers help
support the&eight of thedec%@as thelongest dec%
could support&as half thespan"
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0ydraulic
launchersCo(puteriBedlaunchers push the
pre-fabricated dec%seg(ents on to thepiers".ach cycle (ovesthe dec% 566 (("Total of :666 cyclesre>uired"The cycle is
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+,*.
.C,V.7
3eight of steel bo?
girder dec% sags asspan is co(pleted"+ose recovery syste(attached to raise the
dec% to the level ofthe ne?t pier"This aligns the dec%for the level andcurvature of the ne?tpier"The precision carried
out in the noserecover s ste( is
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)7L,+
C,+*TUCTI,+
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After the dec% construction &as
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!or placing the pylons steel
engineer Marc 2uono(o used atechni>ue &hich &as practicedin the ancient .gypt"
In this .gyptian (ethod thepylons &ere lifted slo&ly usinga hydraulic (achine"
As they &ere being lifted they&ere also (ade to pivot by t&ote(porary steel to&ers@both of
the( secured by a cable"
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Connection bet&een pylon@ dec% and thepierAn inverted 7shape has beenadopted for thepylons@&hich are(etal@and &hich areoriented
longitudinally ase?tensions of thesplit shafts of thepiers"
This arrange(ent
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ATTAC0M.+T ,!
CA2L.*
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3ith all seven pylons in place it&as ti(e to attach the cables staysthat &ould straighten the ripplingdec% and give it the strength toendure the tra'c load"
The road&ay &eighs over ;6666tonnes and the #:; cable staysshould prevent it fro( sagging or
collapsing"These cable stays are (ade of #individual steel strands and have
brea%ing strength of $:666 tonnes"
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SURFACE
To allo& for defor(ations of the (etal dec% under
ra'c@ a special surface of (odi
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3I+D*C..+
A i h d i lf
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An issue that presented itselfafter the bridge &as co(pleted&as the fact that the &ind speed
at the level of the bridge &asFupto #:# %(GhrH@&hich issigni
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/ADI+/ ,!MAT.IAL*
The dec% and thepylons@entirely of (etal@are(ade of steel of grade *4::and *;56"
The piers are constructed in256 concrete"This concrete &as chosen
(ore for its durability than for
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http://www.leviaducdemillau.com/http://www.enerpac.com/html/Projects/Millau/Millau_Launching_Systems.htmlhttp://www.enerpac.com/html/Projects/Millau/Millau_Launching_Systems.htmlhttp://www.fosterandpertners.com/projects/millau-viaducthttp://www.fosterandpertners.com/projects/millau-viaducthttp://www.fosterandpertners.com/projects/millau-viaducthttp://www.fosterandpertners.com/projects/millau-viaducthttp://www.enerpac.com/html/Projects/Millau/Millau_Launching_Systems.htmlhttp://www.enerpac.com/html/Projects/Millau/Millau_Launching_Systems.htmlhttp://www.leviaducdemillau.com/