WJE PROJECTS

On-Call Engineering Services

 
CLIENT
Washington State Department of Transportation
LOCATION
Various Locations, WA

Mechanical Inspection, Rehabilitation Design, and Balance Testing

WJE’s Stafford Bandlow Engineering division (SBE) has provided on-call mechanical and electrical engineering movable and floating bridge engineering services beginning in April 2002 until the present as part of two on-call servi­ce contracts with the State of Washington. For the most recent contract (March 2006 – present), WJE has provided mechanical and electrical inspection services and mechanical and electrical construction support services.


BACKGROUND

The Washington State Department of Transportation operates seventeen movable bridges on state routes throughout the state, including the I-5 Interstate Bridge, SR99; First Avenue South Bridge; SR101- Houquiam River Bridges; SR101 - Chehalis River Bridges,; SR104 - Hood Canal Bridge; SR513 - Montlake Bridge; SR529 - Snohomish River Bridges; US12 - Heron Street Bridge, US12 - Wishkah Street Bridge; US12 - Snake River Bridge; and several floating and retractable bridges, including the Lacey V. Murrow Memorial Bridge, Hood Canal Bridge, and the Homer M. Hadley Bridge.

SOLUTION

Mechanical and electrical inspection services were provided on nine movable and floating bridges as part of the recent contract. The inspections included two random electrical inspections, three specialty inspections and four in-depth mechanical and electrical inspections. The in-depth inspection of the Wishkah River Bridge included span balance testing using the strain gage method. All balance testing and analysis was conducted using in-house personnel.

Construction services provided under this contract included mechanical and electrical support during the rehabilitation of the Simpson Avenue and Heron Street bridges. Simpson Avenue was a major rehabilitation of a double-leaf Straus trunnion bascule bridge and included rehabilitation of counterweight trunnion machinery, span drive machinery span lock machinery, live load supports, and electrical power and control systems. SBE provided full time on-site inspection of the mechanical and electrical work during critical closure periods and inspected manufactured components at the point of manufacture.

WJE is currently providing engineering services for the rehabilitation of SR99 - Duwamish River Bridge (First Avenue South). The rehabilitation of the double leaf hydraulic cylinder drive bascule bridge includes trunnion stabilization, span lock mechanical and hydraulic rehabilitation, live load support rehabilitations, and minor electrical modifications.