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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