Transcript
TOWER BRIDGETOWER BRIDGE
When?
in 1886 the construction of tower bridge began.
work began 22nd April 1886. Divers prepared the riverbed for massive
construction. It must Have been a scary job! After all it was in the older days and they
didn't have modern equipment. The divers wore leather suits with metal helmets, And they were connected to the surface with air
tubes.
Why?
London's big question was which bridge design would allow tall ships and other water traffic to go under the
design as well as allowing transport cross over it.
Horace Jones solved the mystery with suggesting building a Bascule bridge
(French for see saw)
How?In the case of tower bridge you start deep down on the Tames seabed exactly 10m
under the under the surface. But they then have to sink Caissons 9 meters into the
London clay. 24 caissons were
constructed.Then when they were
con structed they were filled with concrete.
As extra support they put steel
pliers inside the concrete. This
would strengthen the peers and
support the towers. This took 4years to consruct the peers
Piers
How?
The steel was created by William Arrol and company in Scotland. the steel was then shifted up
the river on barges from Scotland. As it was needed.
towers
slowly but shorly the steel
construction arose from the river thems like
a black skeleton.
Fun fact
Two massive piers, containing o 70,000 tons of concrete, were sunk into the
riverbed to support the construction. Over 11,000 tons of steel provided the
framework for the towers and walk ways. This was then
clad in Cornish granite and Portland stone, both to protect the underlying
steelwork and to give the bridge a pleasing
appearance.
The special feature that tower bridge ownes is its
bascule design.
fun fact
when they were building the high level walk ways they did not have safety net which
meant that extra care was evolved so they would not drop any tools on other builders
heads below.
Tower Bridge has become a symbol of London and for the Olympics + Paralympics the rings were lit hung on Tower
Bridge....... And David Beckoms went under tower
bridge with the rings lit up on Tower Bridge.
Extra
Questionsplease
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