Project updates
Presidential
library becoming a reality
 A
crane-mounted drilled pier rig prepares to install 300, 35-foot-long
drilled piers for the new
Abraham Lincoln Presidential Library and Museum in Springfield,
Ill. Hanson is providing geotechnical, structural, civil and land
acquisition services for the design and construction of the library
and museum as a consultant to HOK Inc.
Hanson assists on Nigeria tank project
The
Chicago Bridge & Iron Co. (CB&I) selected Hanson
to provide geotechnical consulting services for the design and construction
of a 22-million-gallon liquefied natural gas (LNG) tank on Bonny
Island off the coast of Nigeria.
The
tank will be supported on more than 300 feet of geologically recent
alluvial and marine deposits. The 200-foot diameter, 120-foot-tall
prestressed reinforced concrete tank will contain an insulated steel
lining designed to store the liquefied natural gas at negative 270
degrees Fahrenheit.
During
this project, Hanson worked as an extension of CB&I's staff,
evaluating the subsurface exploration program and laboratory testing
previously conducted by a French firm and the geotechnical analysis
and foundation recommendations provided by a British firm contracted
to the facility owner. In addition to this project, Hanson has provided
services to CB&I across the United States and abroad.
For
more information, contact Dan Whalen at (217) 747-9315 or
click here to e-mail
him.
Construction begins at Homme Dam
Hanson
is providing construction services to the U.S. Army Corps of
Engineers, St. Paul District, at the Homme Dam in North Dakota.
Construction of a new 210-foot-wide concrete chute spillway began
in 2000 and is scheduled for completion in 2003. The project also
involves constructing a stilling basin and walls, placing riprap
downstream of the new stilling basin, and demolishing the dam's
existing 150-foot-wide, 52-year-old ungated chute spillway.
Evaluation to help airport determine expansion plans
Hanson
conducted an airport evaluation at the Monroe
County Airport in Bloomington, Ind., to assess the presence
of sinkholes on property owned by the airport. We are currently
preparing the airport evaluation report, which the airport will
use to assess the feasibility of future expansion.
Design of I-74 underway
Hanson
is providing design services for a portion of the $320 million reconstruction
of Interstate 74 through Peoria, Ill. Hired by the Illinois
Department of Transportation in 1999, Hanson is responsible
for designing a new section of I-74 through the heart of downtown
Peoria that includes 10 bridge overpasses, 1.5 miles of multi-lane
interstate highway, and numerous improvements to the local street
and highway access network. Hanson’s geotechnical group is
responsible for designing the retaining walls immediately adjoining
the interstate highway and connecting ramps that total almost 16,000
lineal feet (4,900 meters) in length.
The
design of the retaining walls is a challenging task because of the
confined working space posed by available right-of-way in the downtown
area and the need to protect existing properties and structures
along the highway’s alignment. Hanson was chosen for this assignment
because of its reputation as a structural/geotechnical firm and
its past experience in developing solutions for similar soil-structure
interaction problems.
Because
of the restricted space for construction, much of the downtown area
requires atypical non-gravity cantilevered or anchored wall design.
These types of walls incorporate an exposed height over which soil
and adjacent properties are retained by vertical and facing elements
and a lower vertical element embedded below the roadway that provides
lateral support. The design is additionally complicated by the need
to incorporate deflection control criteria to protect adjacent properties
and structures rather than using more conventional stress-controlled
design. The soil behavior providing support along the embedded depths
of the walls is modeled with non-linear p-y (load-deflection) curves
that are dependent upon soil type, presence of free water and applied
loadings. Specified design loadings are applied to the soil-structure
model. Deflection, shear, bending moment, and soil response along
the wall are then calculated and the wall elements sized.
Hanson’s
geotechnical group is currently completing its designs for the walls
in the first of three contracts. The project schedule calls for
all wall designs and contract documents to be completed by early
2003.
Firm uses tunnel vision
Hanson
has provided design and geotechnical exploration services for various
tunnel and underground projects nationwide. Here are highlights:
The
Red Line Subway extension, Cambridge, Mass. — This 3.2-mile,
$600 million extension included constructing two tunnel sections
for the Massachusetts
Bay Transportation Authority in Cambridge. Hanson provided design
and consultation services for this project.
The
Center City Commuter Rail Connection, Philadelphia, Pa. —
Hanson provided structural services during the redesign of a relocated
subway surface trolley in Philadelphia, which included relocating
a 400-foot section of underground trolley line. The line was moved
16 feet from the path of a new four-track tunnel. The project was
part of the $67 million, 1,700-foot-long Center City Commuter Rail
Connection.
Washington
Metropolitan Area Transit Authority Rapid-Rail System, Washington,
D.C. — As part of the ongoing rapid transit system work
in the nation’s capital, Hanson designed earth support systems
to facilitate subway construction. We were also hired to develop
solutions to retain earth, support utilities and keep streets open
while the subway was being constructed.
Light
Rail Transit System, Pittsburgh, Pa. — The light rail transit
system in Pittsburgh is a 10.5-mile system that links outlying suburban
areas with the heart of the city. For this phase of the $480 million
project, a 1,600-foot tunnel and loop turnaround station were constructed.
Hanson designed and prepared detailed plans and specifications for
the lateral earth support construction, and served as a consultant
to the contractor’s field engineers to address field problems
and procedures during construction.
Boston
Central Artery, Boston, Mass.—Hanson assisted in preparing
bids for construction of two approach roadway sections of the Third
Harbor Tunnel for this $500 million project. Work included evaluating
subsurface conditions along the alignment, determining allowable
lateral earth pressures for design of temporary support walls and
evaluating excavation stability conditions.
Atlanta
Metropolitan Rapid Transit System design, Atlanta, Ga.—Hanson
designed a permanent underpinning system for an alignment for the
transit system in downtown Atlanta, and we provided the structural
and soils engineering required to bring the value engineering underpinning
scheme to reality.
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