S01 FORTH RAIL BRIDGE .pdf


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FORTH
H RAIL BR
RIDGE
The 2.5 km. (1
1.5 mile) Fortth Railway Bridge,
B
the w
world’s first
2.
1.
ajor steel
briidge, with itss gigantic giirder spans
o
of 521 m.
ma
(17
710 ft.) rankks as one off the great feats
f
of civillization. It
wa
as begun in 1
1883 and forrmally completed on 4 M arch 1890
3.
wh
hen HRH
Ed
dward Prince
e of Wales tapped into
o place a
‘go
olden’ rivet.
Tancred–Arrol, constructed
d the bridge,, robustly deesigned in
4.
e aftermath
of the Tay Bridge disasster by civil engineers
the
Sirr John Fow
wler and Benjamin
B
Ba
aker. The balanced
5.
can
ntilever prin
nciple was adopted. The main crossing
com
mprises tub
bular struts and lattice--girder ties in three
double-cantilevvers each connected
c
by
b 105 m. (345 ft.)
‘su
uspended’ girrder spans re
esting on the cantilever ends and
6.
seccured by ma
an-sized
pin
ns. The outsside double--cantilever
sho
oreward end
ds carry we
eights of ab
bout 1000 ttonnes to
cou
unter-balancce half the weight
w
of the
e suspended span and
live
e load.
This co
oncept is readily undersstood from Baker’s
B
‘hum
man
cantile
ever’ model with his aassistant Kaiichi Watana
abe
7.
representing the live
load. T
The pull in his supporte
ers
8.
in thhe ties and the
t push in the
t
arms indicates the tension
9.
s
the compression
inn the tubes.
lower struts
o the 110 m.
m (361 ft.) high double
e-cantileverss is
Each of
supporrted on we
ell-founded granite face
ed piers. The
T
bridge’s construction involved the employ
yment of 4,0
000
men at
a times, the
e use of 544,000 tonness of steel and
a
10.
driving
g 6,500,000 rivets.
Its ttotal cost was
w £3,200,0
000
(~£235,000,000 to
oday). Durinng operationss, rescue boa
ats
s
un
nder each caantilever sav
ving at leastt 8
were stationed
lives, but still 57 men lost thheir lives. The
T
continuo
ous
ng of its 18 ha. (45 acree) surface, fo
or the first 100
1
paintin
years using paint supplied
s
by C
Craig & Rose
e, is now beiing
u
a state
e-of-the-art ppaint regime with at least a
done using
20-yea
ar life.

In 1996 Railtra
ack (now Network Rail), at the requ
uest of the Health
H
& Saffety executivve, began a structural and
a
ult of this was the £40m refurbishmeent package which
w
began
n in
maintenance asssessment off the structure. The resu
98; this comp
prised steelw
work repairs, surface coatting, access improvemen
nts and an uppgrade of the floodlightin
ng.
199
The
e contractor undertaking
g this work le
eft site in 20
002 due to financial
f
prob
blems. Balfoour Beatty Ciivil Engineeriing
gain
ned the maintenance co
ontract in 200
02 (£10M peer annum un
ntil March 20
009). The cooating system
m employed for
the steelwork rrequires blast cleaning to
o bare metall; an applica
ation of zinc based primeer to prevent corrosion (35
(
oxy intermediate coat pro
oviding a barrier (400 microns);
m
andd, a polyuretthane gloss top
t
miccrons); a glass flake epo
coa
at to give an
n attractive “Forth

Bridge
e Red” finish
h (35 micron
ns) on all of its estimateed 400,000m
m². This syste
em
whiich has been
n tried and tested
t
in an offshore en
nvironment is designed to
t give a 200year life wh
hich means the
t
brid
dge may be ffree of its leg
gendary pain
nters after 20
009 for a sho
ort while!
Tod
day, the bridg
ge, Scotland
d’s biggest ‘listed’ buildin g, continuess to form a vital
v
artery inn Network Rail's
R
East Coast
railw
way system; it carries 18
80 - 200 train
n movementss per day.

Copyright © 200
04 Forth Bridges Visitors Centre Trust (a Registerred Charity). All rights res
served.

source:http://www.foorthbridges.org.uk/railbridgemain.htm

ENSAN
N - ANGLAIS - S011
R F TH
HOMAS

page 1 of 2

FORH RAIL BRIIDGE

FORTH RAIL BRIDGE

WORDS :

1.

IRON / STEEL / PLASTIC

2.

DISTANCES / SPANS / LENGTHS

3.

RHH / HRR / HRH

4.

AFTERMATH / UPSHOT / FOLLOWING

5.

BEAM / STRUCTURE / CANTILEVER

6.

MAN-SIZED / BIG / HUGE

7.

DEAD / LIVE / HUMAN

8.

COMPRESSION / TENSION

9.

COMPRESSION / TENSION

10. PINS / RIVETS / BOLTS

ENSAN - ANGLAIS - S01
R F THOMAS

page 2 of 2

FORH RAIL BRIDGE


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