NEW YORK The California
Department of Transportation (Caltrans) is investigating the
cause of damage to 32 steel rods on the San Francisco-Oakland
Bay Bridge that had been supplied by Painesville, Ohio-based
Construction workers tensioning
96 steel rods for bridge contractors American Bridge Co.,
Coraopolis, Pa., and Fluor Corp., Irving, Texas, in early March
found evidence of fracturing on one-third of the rods.
Dyson was contracted for 288
threaded steel rods ranging in length from 9 to 17 feet for the
bridge, a spokesman for San Franciscos Metropolitan
Transportation Commission (MTC) told AMM. Ninety-six
rods were manufactured and installed in 2008, of which 32
showed evidence of fracturing. The remaining 192 rods were
installed in 2010, he said.
"It has not yet been determined
whether the presence of excess hydrogen (that may have caused
the damage) is due to something in the manufacturing process or
something in the galvanizing process," the spokesman told
Caltrans is currently
investigating Dysons possible culpability, and the MTC
spokesman said authorities dont know yet if the company
had made the product from start to finish.
"It hasnt been determined
whether galvanizing was done by Dyson itself or a
subcontractor," he said. Dyson Corp. and Caltrans didnt
return calls for comment.
The fasteners were supplied for the bridges
$6.4-billion reconstruction project on its eastern span, which
started in 2002, according to the San Francisco-Oakland Bay