11th Street Corridor Design/Build
Location: Washington, D.C.
Client: District Department of Transportation
JMT is the lead designer for the Contractor team for this $260
million Design/Build project, which is the largest construction
project in DDOT history.
Previously, no direct connection existed between the Southeast
Freeway and the northern segment of the Anacostia Freeway.
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 we saved the
client $80 million off of the original engineers estimate ($340
million for 85% of the engineer's estimate) through our Alternative
Technical Concepts for this Design/Build project.
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.
« Go Back