(3rd Quarter 2003)
Building bridges is nothing new for Vecellio & Grogan. But building them from
the decks of other bridges is a span into new territory for the heavy/highway
contractor, which has been serving the Mid-Atlantic states for more than six
decades.
Using a construction technique increasingly favored by transportation and
environmental officials, Vecellio & Grogan will work from temporary platforms to
build four of the 10 bridges on its new I-540 construction project just
northeast of Raleigh, NC.
The platforms will minimize potential impact to the Neuse River and Beaverdam
Lake, two waterways within the project boundaries. Each waterway is receiving
twin bridges, one for each traffic direction.
“The platforms are essentially bridges themselves, with steel pilings, piers,
and wooden decks,” said Matt Farley, a member of Vecellio & Grogan’s engineering
and estimating team. “But they have to be built first, before we can construct
the bridges over the waterways.”
New Environmental Awareness
In the past, constructing bridges over water often included building a
causeway, or crushed-rock pad jutting into the water, as a base from which to
work. But heightened environmental awareness has led to stricter regulations,
making the use of temporary construction platforms a preferable alternative.
With a total price tag of $1.8 million, the platforms are not inexpensive.
But the cost is a small part of V&G’s $67 million contract, which covers new
construction of nearly eight miles of six-lane, divided highway, including
bridges and drainage. Moreover, the environmental benefit is considered well
worth it by transportation officials, who made the use of platforms a
requirement for the job.
“No equipment or temporary fill can be placed in the environmentally
sensitive waters,” said Rick Hertzer, Vecellio & Grogan’s Chief Engineer. “As a
result, the platforms are a critical part of the project, allowing us to
minimize impact to the wetlands.”
Platforms Built "From The Top Down"
In keeping with “green” construction techniques, the platforms themselves
will be very carefully built. Starting from the shore, the 30-ft.-wide platforms
will be built in small sections — with steel pilings driven, piers and cross
beams welded, and wooden beams laid for the deck of each section. Crews and
equipment will then move forward onto the completed surface to build the next
section.
When finished, one platform will be about 800 feet in length; the other, 600
feet. The platforms will be situated directly between the future twin bridges
over Neuse River and Beaverdam Lake. They will support the cranes and other
heavy equipment used to build the concrete-and-steel I-540 spans. Once the
bridges are finished, the platforms will be disassembled and removed.
I-540, also known as the Northern Wake Expressway, is a six-lane divided
highway handling outer beltway/bypass traffic on the northwest side of Raleigh,
NC. To extend its overall length, new segments are being added on the northeast
side. The 7.75-mile section under contract to Vecellio & Grogan will run from
east of US-1 (just south of Perry Creek Road) to US-64 (just east of
Knightdale).
Work is scheduled to begin in September, with completion by mid-April 2006.
The I-540 project is not far from another Vecellio & Grogan job in progress.
Under a contract awarded last year, the company is realigning a section of US-64
just east of Raleigh, connecting it to a new intersection on I-440, Raleigh’s
inner beltway.
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