A Tokyo-based joint
venture is the apparent low bidder for construction of the
centerpiece of the Federal Highway Administrations Hoover
Dam Bridge project. Obayashi Corp. and P.S. Mitsubishi Construction
Co. Ltd., beat three other teams with a $114-million low bid
for the 1,905-ft-long single-arch bridge to be built 1,500
ft downstream from the dam.
Although 15.6% above engineers
estimate, the A+B bid is still $12.9 million below the runner-up
team of Peter Kiewit Sons' Inc., Omaha, and Flatiron Construction
Corp., Longmont, Colo. "Its an extremely volatile
market in terms of steel and concrete," says F. Dave
Zanetell, FHWA project manager. He anticipates a project award
by months end.
The $21.4-million, 1.8-mile-long
Arizona approach, being built by R.E. Monks Construction Inc.,
Fountain Hills, Ariz., with Chino Valley, Ariz.-based Vastco
Inc., is scheduled to finish in November. Edward Kraemer &
Sons Inc., Plain, Wisc., should wrap up the $30.1-million,
2.2-mile-long Nevada approach by Oct. 2005. Both bids came
in at 10% to 15% below engineers estimate, creating
a financial cushion for the $234-million bridge, Zanetell
Construction of the concrete-and-steel
composite main span poses daunting challenges due to the canyon's
sheer walls and a climate where temperatures routinely reach
120° F. Designed by an HDR Inc., Omaha-led team, the structure
will rise 890 ft over the Colorado River and will be North
Americas longest single concrete span.
FHWA has proposed two erection
sequences: using dual towers with tiebacks to cast the span
in place, or place precast bridge segments with cranes. The
choice will be made after the contract is awarded.
Delayed reauthorization of
the federal highway bill pushed project completion back a
year to 2008 (ENR 7/12 p. 12). Arizona and Nevada have committed
$50 million each in Grant Anticipation Revenue Vehicle bonds.