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"The fight is never about grapes or lettuce. It is always about people." Cesar Chavez |
:: Monday, May 17, 2004 ::
Bridge girder falls to I-70, killing 3 people in SUV By Steve Lipsher Jeffrey Leib and Brittany Anas, The Denver Post
Girders like the one installed on the C-470 bridge are tall, have a narrow base and are "inherently unstable" until the final bridge deck is installed on top of the structure, said Taka Kimura, a structural engineer and a bridge expert with the Colorado chapter of the American Society of Civil Engineers.
The 100-foot girder that fell Saturday was 6 feet high and 2 feet wide at its base, which sits on concrete supports, according to CDOT.
To stabilize single girders during bridge construction, it is necessary to brace them adequately onto existing structures or attach them to other new girders that are installed as part of the bridge work, Kimura said. A crane can also be used for support.
The girder was temporarily braced to the existing bridge with five metal bars spaced along the 100-foot length. The bracings, fastened to the bridge with 8- to 10-inch bolts, came loose as the girder collapsed.------------------------------------------- posted 6:41 AM :: reference link ::
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