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GOLDEN GATE BRIDGE (strands; JM (cable band (suspension ropes / shortened…
GOLDEN GATE BRIDGE
strands; JM
go through a big tube (splay collar)
on top / crimping machine is fastened around every table
strands are pressed together
are covered with a 3 feet cable
cable band
clamped every 50 meters
suspenders are hang over cable ties
suspension ropes / shortened to length
for right height of the street
floor beam
support smaller bars (stringers)
stringers / support roadway
towers; DR
each has two legs
crossbracing against force of wind
identical
two towers
build up from clusters of steel tubes
cells
made of angels and plates rivted together
3.5 feet square
distribute weight on thick steel plates
prevent concrete from crushing
pinned in place with long dowels
45 feet tall
lifted into place with creeper derrick
towers on certain height
creeper derrick is hoisted up between them
on top two stiff legged derricks
marin tower was simpler to build
counterpart across gate much harder
marin tower was faster completed
cable system; DR
saddle
each sattle is lifted in three pieces because of weight
finished cables rest in there
shaped seat with grooves
special designed structur
traveler is fixed to a hauling rope
when signal given
rope starts moving
carrying traveler and cargo up to the top of tower
end of wire looped arround strand shoe
temporarily clamped on strand shoe
fed through a counterweight
ensure the tension
before passes a wheel called traveler
arrives at side on large reels
temporary bridges; DR
surface of footbridges
panels of red wood planking
rest on steel ropes
were used by workers
in spinning and prepering the man cables
temporary footbridge from anchorage to anchorage
guide wire
hangs in percise sag of finished cables
cable is made of 61 seperate strands
three foot above feet bridge
concrete piers; MB
fender
eliptical concrete ring
20feet into wather / 15feet over wather
protection pier / coffer dam
pier
central point
receive the forces
steel angle irons
space between pier/fender
eventuell floded
Marin Pier
shallow water
coverdam
heavy timber-boxes with stones
connected with land
steel sheet piling
solid footing
construction; JW
constant remain
25-foot-trusses
two along the roadway
one hold them together - windtruss
minimize bending
towers
lead the Forces in the water
cables
concrete deck
railing
streetlights
steelelements
temperature movement
control the movements - not prevent
Ends of the roadway are hinged to the tower
rotate slightly on horizontal plane
rocker arms
conclusion; JW
architect: Strauss and Clifford Paine
construction took less than 5 years
most famous bridge
was the longest bridge
New leader: Akashi Kaikyo Bridge in Japan
anchorages; MB
base block
keyed into bedrock
anchor block
keyed into base
eye bars
cables attached to
heavy girders
back of the bars
weight block
pushing down
new bridges; JW
dimension
larger bridges
larger Suspension
new ideas
new shapes
aerodynamically shaped
new technologies
less steel than used at the GGB
sophisticated devices insteed thick walls
bridge information; DS
California 1930
not enough ferries
waiting for hours- sometimes even days
too many cars
Ing. Joseph Strauss take on the challenge
suspension bridge
main part
the towers
the cables
the roadway
the cable anchorages
the high at the center of the midspan 220 feet
and at the two towers is 210 feet
the main turned out to be 4200 feet
roadway structure 30 feet
towers sunk 20 feet into bedrock
curvature of the cable 4200 feet
90 feet was chosen for the road
wires; JM
carried 4 wires
carried 6 wires
1) in the middle / the pulled together
2) wire loops / removed again
3) wheel / picks up new wire loop
4) opposite / pulled as well
strand / made of 500 miles
spool runs out / new is connected
wires / connected with anchoring
strand shoe / looped hermetically
anchorages / enclosed with high walls