Bridge Pin

Bridge Pin

The zip Coronado Bridge

The Coronado Bridge is a bridge to five lanes with a zipper running down the aisle concrete. While residents Coronado residents and visitors to take a bit of yourself is really a feat of engineering.

History

The zip has installed over a weekend in April 1993 by designers, Barrier Systems Inc. and held its first race April 8, 1993 during a ceremony.

The cost of materials for sealing, installation and cost of the transfer of two machines that compress zip and unzip totaled nearly $ 8 billion.

Statistics

• The transfer of machines weigh 25 tons each and cost $ 500,000 each.
· They are equipped with tires of 900 pounds taken to remove the bulldozers.
· They are powered by engines 350 hp Cummins diesel.
· They travel at about 3 mph.
• The closing consists of 1.6 miles of concrete segments.
• Each segment of the 3-feet for $ 250 and weighs 1400 pounds.
· The concrete segments of the grid has a total weight of over 3.5 million pounds.
• Changing lanes is completed by 12 feet of 25-45 minutes.

Pull the rack:

The closure is formed by segments of concrete 2 feet wide by 3 meters long, each linked to adjacent segments with large steel pins. These segment-specific "zip" and "unzipped" by two machines Transfer working in tandem.

Five days a week twice a day, transfer machines work their magic on the fence. The machine moves cons segments six meters wide and the center lane and the second machine to move another 6 feet to complete the lane change direction.

Within each transfer machine, the dashboard looks like a simple version of an aircraft cabin. There is also a television monitor showing the view of the machine behind. The machines automatically guided by radio cables embedded in concrete.

Although there is an autopilot on green button, pilots have to control the speed of the machine in fractions miles per hour. They also adjust the amount of tension or drag on the wheels winch 3 feet "under the machine to keep the segments of the barrier section of ups and downs.

About the Author

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