We have extensive experience providing structural engineering for all types of transportation structures. Bridges, interchange ramps, retaining walls, sign structures, and stormwater management and drainage structures are all part of our project portfolio.
J.E.B. Stewart Trail Bridge, M-NCPPC
MD 147 Pedestrian Bridge, Baltimore, Maryland
RJM Engineering provided final design for the M-NCPPC park bridge over Little Monocacy Tributary along J.E.B. Stewart Trail. This was a concrete arch structure with special architectural features to enhance bridge aesthetics. Structural design of the bottomless arch was designed to accommodate HS20 loads, with provisions for access by farm equipment. Parallel bridge abutments were used to minimize environmental impacts and improve bridge aesthetics.
Services also included preparation of a floodplain study using HEC-RAS modeling. The existing topographic survey information was processed, and 18 cross sections were generated to build four HEC-RAS models for analyzing the 100-year floodplain upstream and downstream of the bridge in existing condition, proposed condition and temporary diversion condition. RJM prepared floodplain reports, erosion/sediment control plans and joint federal/state permit documentation, and provided coordination with the U.S. Army Corps of Engineers, Maryland Department of the Environment, and Montgomery County DPS staff.
This project consisted of preparation of preliminary and final design plans, bidding phase support and construction phase services for the Becca Lilly Park pedestrian bridge replacement. The replacement bridge is a new 30’ long and 6’ wide steel/concrete pedestrian bridge that replaced the old plastic bridge destroyed by floodwaters.
During the preliminary phase, RJM Engineering, Inc. developed preliminary structural plans showing two alternative bridge decks. These alternative options included alternative span configuration, abutment details and waterway hydraulic opening, which was maintained or slightly improved. The proposed preliminary concepts included sufficient details to prepare comparative construction estimates. The existing concrete abutments of the old bridge were evaluated and modified for the new bridge to support heavier loads.
In the permitting phase RJM coordinated and obtained environmental permits from Montgomery County DPS, Maryland Department of Environment (MDE), and Army Corps of Engineers (USACE).
Final design phase services included abutment modification details, design of superstructure showing structural details and reinforced concrete deck, construction cost estimates, bidding documents and project specifications. Design of the replacement bridge complied with federal, state and local standards and guidelines, and applicable ADA standards. Throughout the design and construction phases of the project, work was fully coordinated with M-NCPPC staff and other public agencies.
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RJM Engineering provided final design and construction phase services for two retaining walls for M-NCPPC. Engineering services included design for a 150’ long retaining wall along Sligo Creek. In order to minimize excavations, Sligo Creek retaining wall was designed as a top-down retaining wall, with stone surface finish.
RJM also provided design for the replacement of an existing damaged retaining wall with a new wall in Lake Needwood Park. This retaining wall was designed as a block MSE wall, and incorporated an opening for an existing boat ramp, as well as special surface finishes to match existing bridge abutments.
The designs included geotechnical investigations, scour analysis and traffic control plans. RJM prepared flood plain permits, erosion/sediment control plans and joint federal/state permit documentation, and conducted field meetings with the U.S. Army Corps of Engineers, Maryland Department of the Environment, and Montgomery County DPS staff.
RJM also provided construction phase services for both sites, consisting of support to M-NCPPC during the bidding phase, shop drawing review and support to address construction-related issues.
