Roeder Avenue Bridge Construction Administration

Roeder Avenue Bridge Construction Administration City of Bellingham

Central Avenue Improvements

Central Avenue Improvements City of Bellingham

Inspection, Load Rating and Bridge Rehabilitation

Inspection, Load Rating and Bridge Rehabilitation City of Bellingham

Old 99 (Riverside Drive) Improvements

Old 99 (Riverside Drive) Improvements Cities of Mount Vernon & Burlington

I-405 South Bellevue Design/Build Project

I-405 South Bellevue Design/Build Project WSDOT

Middle Fork Bridge Rehabilitation Construction

Middle Fork Bridge Rehabilitation and Construction Management, City of Bellingham

  • Sound Transit Lakewood Layover Yard

    Friday, 23 September 2011 00:00
  • Broadway Avenue Bridge Replacement

    Thursday, 22 September 2011 00:00
  • Roeder Avenue Bridge Construction Administration

    Thursday, 15 September 2011 06:46
  • Central Avenue Improvements

    Thursday, 15 September 2011 06:40
  • Inspection, Load Rating and Bridge Rehabilitation

    Thursday, 15 September 2011 04:29
  • Old 99 (Riverside Drive) Improvements

    Thursday, 15 September 2011 03:55
  • I-405 South Bellevue Design/Build Project

    Thursday, 15 September 2011 03:47
  • Middle Fork Bridge Rehabilitation Construction

    Thursday, 15 September 2011 03:22

Old 99 (Riverside Drive) Improvements

Old 99 (Riverside Drive) Improvements
Cities of Mount Vernon & Burlington

TranTech staff, Kash Nikzad, Jim King and Theo Trochalakis were the Project Manager and Senior Structural Engineers on this project for the Cities of Mount Vernon and Burlington to provide preliminary study, design, and environmental services for widening 1.6 miles of the Riverside Drive/South Burlington Boulevard corridor including a replacement bridge to span the Skagit River. South Burlington Boulevard is a two-lane concrete roadway to be overlaid and widened to five lanes. The old bridge was an existing two-lane steel truss bridge built in 1938.

The preliminary engineering phase included evaluation of several structural types, including concrete and steel to determine the most viable crossing. A precast concrete bridge based on the use of the new supergirders with main spans of 180-feet was chosen to be advanced to final design. A Value Engineering study was conducted prior to the preparation of PS&E documents. Critical considerations in the selection of the bridge type, span arrangements, etc. were: construction cost; river hydraulics; scour and debris accumulation at the piers; bridge aesthetics; constructability; horizontal and vertical clearances; and maintenance of traffic during construction and demolition.

The new bridge is an 850-feet long, 5-span, post-tensioned, state-of-the-art, four-lane facility widening to five lanes on the south side. It incorporates provisions for pedestrian and bicycle traffic on both sides of the bridge. The approaches on the Mount Vernon and Burlington sides are upgraded to include widening, signal modifications, sidewalks and landscape amenities.

For the first time nationwide, 177-foot long precast W95PT supergirders, weighing 122 tons each, were transported to the construction site over a temporary work bridge, and were erected over the piers in one piece at 9-foot on centers with no intermediate falsework.

Other aspects of the project included: preparation of right-of-way and environmental documents including a Biological Assessment, permitting, utility relocations, soil/foundations and field surveys in addition to the bridge and approach roadway engineering. Numerous agencies were involved in the engineering, permitting and environmental elements. These agencies include: Washington State Department of Transportation, the U.S. Coast Guard, as the senior permitting agency, with Corps of Engineers taking a secondary role, as well as several state and local agencies.

The structure is a very prominent feature along the Skagit River. Recreational amenities are located upstream and downstream. The bridge is considered a “gateway” linking the cities. The highway corridor is highly developed commercially. As the principal linkage between the cities, traffic volumes are in excess of 20,000 vehicles per day.

 
Services

TranTech Bridge Projects Requiring Overcrossing BNSF Railway Tracks

Structural Engineering:
TranTech's structural engineering group provides comprehensive services for structural design of bridges; highways and other industrial facilities. We also provide services in the areas of seismic retrofit, structural condition inspection and load rating of bridges.

Civil Engineering:
TranTech’s civil engineers provide comprehensive services for roadway design; drainage & stormwater treatment; traffic signals and illumination design.

Construction Management:
TranTech’s construction administration team provides services in the areas of contract administration, construction inspection and materials testing coordination and management, resident engineering, contractor work coordination.