11th Street Corridor Design/Build
Location: Washington, D.C.
Client: District Department of Transportation
Completed Phase I freeway bridge
JMT is the lead designer for the Contractor team for this $351
million Design/Build project, which is the largest construction
project in DDOT history.
Previously, no direct connection existed between the Southeast
Freeway (I-695) and the northern segment of the Anacostia Freeway
(DC 295/I-295). Because of this unfinished connection,
regional traffic was forced to neighborhood streets, resulting in
significantly increased traffic on local streets within the
Anacostia and Capitol Hill neighborhoods. The 11th Street
Corridor project will complete all freeway connections for regional
traffic between the Southeast Freeway and Anacostia Freeway,
providing maximum accessibility while separating local traffic from
regional traffic. The project also promotes job growth and
economic stimulus to the area as part of the greater Anacostia
Waterfront Framework Plan.
By utilizing innovative design techniques, JMT refined the
planning document alignments and interchanges to reduce costs and
environmental and community impacts. We estimate that our
Design/Build team saved the client $109 million from the
original engineers estimate through our Alternative Technical
Concepts.
Major components of this project include:
Highways & Bridges -
To allow for the efficient staging of the construction, JMT's
complex design includes three new major continuous steel
multi-girder bridge crossings of the Anacostia River and two
complex interchanges. Specifications on these bridges
include: a 5 span 866 foot long bridge, a 5 span 926 foot
long bridge and a 10 span 1,650 foot long bridge. Spans range
up to 234 feet for the main span over the Anacostia River. These
bridges provide a 16-foot shared use path connecting both sides of
the River and Anacostia Park and also include street car tracks and
provisions for catenary lines for DDOT's future Street Car
system.
Traffic Engineering - In such a large
metropolitan region, extensive traffic engineering plans and
analysis; and maintenance of traffic (MOT) is critical to keep
construction on schedule. All modeling for the local street
network to determine lane configurations was developed using
SYNCHRO. JMT developed traffic engineering for signals,
signing, marking and MOT. The extensive MOT phasing includes
layout of temporary signing, marking, channelization devices,
temporary pavement, temporary concrete barrier and detour
plans. Signing plans include the layout of all guides,
regulatory and warning signs.
Geotechnical Engineering - JMT managed and
provided interpretation of the subsurface exploration including
geotechnical evaluation for roadway construction as well as a
pre-cast arch structure, bridge foundations, culvert crossings,
slope stability and retaining wall design. During
construction, we were responsible for providing geotechnical
consultation related to roadway construction, bridge foundations,
slopes and retaining wall.
Environmental Monitoring/Regulatory Permitting
- JMT is responsible for all environmental compliance efforts and
environmental design and construction measures for this
Design-Build project including:
- Developing the project Environmental Compliance Plan and
subsequent updates; obtaining all environmental permits and/or
permit updates.
- Performing quarterly compliance audits, environmental
commitment tracking and database updates, daily compliance
inspections of erosion and sediment control elements.
- Overseeing water quality monitoring efforts to ensure that all
in-river activities, including pile driving of bridge piles, are
performed with adequate controls.
- Assisting project architects in obtaining approvals from the
National Capital Planning Commission and the Commission of Fine
Arts for aesthetic treatments of project elements.
- Providing training in environmental compliance to all employees
and subcontractors that work on the site.
Graphics - JMT's
in-house graphic artists provide support services for all public
involvement activities, including 3-D models of the proposed bridge
and overlook, and photo realistic renderings (before and after) of
the bridge and the surrounding roadway system for displays and
presentations.
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