Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
BUILDING BIG Image with 5 links within the image
Bridge Basics
BUILDING BIG Home Page BUILDING BIG Site Map BUILDING BIG Labs BUILDING BIG Databank BUILDING BIG Glossary
Bridges
Domes
Skyscrapers
Dams
Tunnels
Buy the DVD
_  
Chesapeake Bay Bridge-Tunnel
Continuous span
beam bridge
_
The continuous span...
gives beam bridges the ability to span great distances. A single beam bridge rarely spans more than 250 feet. But, as in the Chesapeake Bay Bridge-Tunnel, several beam bridges can be linked together, creating what is called a continuous span.


Swing Bridge: George P. Coleman bridge
Swing bridge:
George P. Coleman Bridge
_
The movable bridge...
like the George P. Coleman Bridge, has a deck that moves. A swing bridge has a deck that rotates around a center point; a drawbridge has a deck that can be raised and lowered; a bascule bridge deck is raised with counterweights like a drawbridge; and the deck of a lift bridge is raised vertically like a massive elevator.


Back to Bridge Basics

  _
_