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April 8, 2002: Look at the progress so far! This is
one of the anchorages on the Crockett side. It's going to have cables attached
to it to support the bridge. With the towers and the anchorage done, all
we need is the roadbed and the cables! Keep up the good work, bridge
builders! |
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April 8, 2002: This is a picture of Tower 2 (or as we
learned earlier, the tower closest to Crockett). You can't really tell
from this picture the work that was done from the last picture, but
there's a bit of a difference. Every time we go to see the bridges, we can
see how tall the towers are getting. They've even started to tower over
the old bridge. |
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April 8, 2002: This is Tower 3 or in other words, the
Vallejo Tower. The towers are so tall, we can see them from our windows in
our Glen Cove houses. You can also see the towers traveling up Glen Cove.
When the bridge is completed, Glen Cove dwellers will have a wonderful
view. |
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May, 19th: THE LAST CONCRETE WAS POURED ON THE SOUTH TOWER
TODAY! |
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June 17, 2002: If you click on the
picture and look at the larger view, you might be able to see the crane in
between the bridge towers. The crane had a cable attached to it, probably
beginning the connections between one tower to the other. When
cables are being run underwater, the waterway needs to be closed to boat
traffic. Just out of range of this picture, a Coast Guard boat was
patrolling to make sure no boat traffic would interrupt the work. |
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June 17, 2002: We took this picture at the Historical
Museum of Crockett. Look at the price! Right now it costs $2 to cross the
bridge. |
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June 17, 2002: This is the South tower (the one on
the Crockett side). Can you see the cables connecting to the anchorage?
You probably can't in this small picture but if you click on the picture
you can see a larger view and you can see the suspenders. |
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August 5, 2002:
The footbridge has been completed and cable is arriving on the
Vallejo side. The line of the bridge is visible and it really is
starting to look like a suspension bridge. Beginning the first or
second week of September, cable spinning will begin. Now they are
doing practice runs getting ready to spin the 5,084 individual cables that
will hold up the bridge. |
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August 5, 2002: On the top of the
south tower you can see that the cable guides have now been
installed. This picture was taken after we went on a tour to the top
of this tower. You can read all about our tour on our Tour
Page. |
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August 5, 2002: The other project
going on at the same time as the bridge is the Crockett interchange.
Sometimes work on the bridge has to be halted so that work can be done on
the roadway above. |
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September
17, 2002: Cable spinning ... HAS BEGUN!! Crews are spinning 24
hours a day. The spinning operation is managed on the Vallejo side. When
we took these pictures, however, the cable spinning was halted due to difficulties.
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September 17, 2002: It takes 232 wires
to make one strand, and 37 strands to make one main cable (there are two
main cables) -- that's 13 thousand miles of wire. The wire cable is made
of high-tensile steel and was made in England. |
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September 17, 2002: The cable is
carried across by the cable spinner (as shown here) or
"traveler." The traveler has the brightest paint of
any other equipment on the site. When it is moving, it is quite
visible up on the wires. When the cable is being spun the traveler goes
back and forth across the bridge span and it carries two strands on each
trip. Then the wire is spliced (connected) to make one long continuous
wire. A great place to learn about this process is in David Macauley's
book, Building Big. He has great diagrams of the cable
spinning process done on the Golden Gate Bridge. |
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September 17, 2002: Workers were on
the foot bridge checking the wire bundles. Below are pictures of cable
spinning equipment. Engineers are using the CTM (Control Tension
Method) of laying cable. It's a computerized method to control how much
tension is in each wire. The picture of the tower below is where the
counterweights are used to apply tension. All of the spinning equipment
was made in Norway and some engineers have come from there to manage this
part of the construction. |
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September 17, 2002: We were able
to look down into the anchorage on the north side where the cables are
attached. The inside of the anchorage is known as the "splay
chamber." Here is where the wires which have been bundled into
strands are now separated out and attached to the rods imbedded in the
concrete of the anchorage. By splaying the wires out, the tension
caused by supporting the bridge is distributed among all of the wires
equally. |
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September 17, 2002: This picture
shows the two old truss bridges in the background at about the level that
the roadbed on the new bridge will be. There will be a visitor's
overlook here and bicyclists and pedestrians will be able to cross over
the new bridge from this point. The 1927 bridge in the middle will
be demolished when the new bridge opens
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January
1, 2003 |
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The beginning of a new year...the cable
spinning process has been completed and the suspender cables are
beginning to be hung. You can see this on the following
pictures. The cable spinning went smoothly and the bridge project
is now slightly ahead of schedule with the bridge expected to be open to
traffic in late October or early November. Following the
completion of the cable spinning, the cable bundles were compressed with
a compaction machine which compressed them into a round shape.
They were then tied with metal bands at even intervals along the
cables. Eventually, they will be wrapped with one continuous
cable. The pictures immediately below were taken on the Vallejo
side at the dock of the Golden Bear, the white ship you see to the left
of the bridge. This ship is the training vessel for the California
Maritime Academy, a California State University which specializes in
maritime engineering, navigation, and other ocean sciences. The school
is located right there in Vallejo.
Click on the pictures to see them
larger. |
These pictures were taken from the
Crockett side of the bridge. The construction site was idle as
workers celebrated New Years Day--and all their hard work, of course.
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The separate project
going on at the same time as the bridge construction is the
major construction of the bridge off ramp and approach in
Crockett. Here, you can see the progress being made there. |
| Here you can see the support work
underneath the bridge approach. Work on both projects has
to be carefully coordinated so that workers are safe and don't
have tools and equipment dropping on them. |

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You can see from these shots that
the cables have been completed and are now attached to the
anchorages. |
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Imagine that the bridge deck is
attached to these cables. The deck will be parallel to the
deck of the existing bridges in the background. Remember
that the truss bridge closest in this picture will be
demolished, leaving two very different-looking bridges, one a
cantilever design, and one a suspension. |
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| January 25th Update: The suspender
cables have been hung and the next big phase of the bridge construction
is set to begin: the roadbed or deck is about to be suspended!!!
In fact, this morning, the first sections have arrived and crossed under
the Golden Gate Bridge. They made the long voyage across the
Pacific Ocean beginning on January 4th, when they left the docks in
Japan close to the construction site where they were built. The first of
the huge 120 by 95 foot sections is slated to be raised into place
January 30th. This first piece will be connected to the center of the
bridge. Jacks that are hanging from the main cables will be
attached to the deck section on the transport ship and a coiler will
lift it into place. Workers will then attach it to the suspender
cables. The deck will be made up of 24 sections in all, and will
come from Japan in 3 shipments. The next boat should arrive in
late February and the final one in March--three years after we began our
project at the groundbreaking ceremony.
You can view the draft plans for the deck sections by
following this link: Draft
Plans |
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January 29, 2003: The deck pieces
have arrived from Japan and the huge ship is docked off of the city of
Rodeo, waiting to make its way up the San Francisco Bay to the
construction site. The ship is carrying 8 sections of the bridge
deck as you can see. To get a sense of the size of the ship, to the left
of the flagpole, you can make out in the distance the Vallejo Ferry.
This ferry carries passengers between Vallejo and San Francisco every
day. The trip takes about 55 minutes. Many commuters get to
work this way, but many more will cross the new bridge and head into
congested traffic. |
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