We have completed Inspection and Maintenance on the Cathodic Protection Systems on several ODOT bridges. Most of the work was accessed using a Snooper or a Crane. We tested the reference electrodes to determine if they were still operational and to see what the current corrosion potential was for each zone. The zinc coating in each zone was inspected for cracks or disbonding. As needed, we also repaired system negative connections and installed an upgrade to various J-Boxes so that the testing in the future may be conducted without removing the cover on each box. When each bridge is complete, the data is organized and submitted to ODOT with a full report on the status of each zone and each reference electrode.
In the 1980’s we had a project with the City of Portland, Oregon to re-arch and stiffen several under-deck floor beams on the Broadway Bridge. The bridge is a multi-lane structure which had to remain open at all times. The challenge was to get materials, men and equipment safely in place. The project involved steel preparation, fabricating fitting, welding, and coating.
This was a difficult fix for a salmon hatchery dam because the foot print of the dam sets on a sliding fault where the rock hillside actually moves approximately 4” per year. The dam project was a design and build request to devise a plan that constructed the dam gates in such a way that they could be shortened as necessary as the mountain moved towards the stationary fish ladder area. This would protect the integrity of the gate system and still not jam up and bust during high water-flow times. We also installed a zinc coating as a passive cathodic protection system rather than galvanizing the ladder and gate.
We have been involved in several railroad projects and have a close working relationship with the Port of Tillamook Bay. We have repaired several tunnels and bridges, both steel and wooden trestles. We also installed suspension systems to support fiberoptic cable along 57 railroad bridges and bury it in 10 tunnels.
We were also involved in some emergency tunnel repairs to be done along the Port of Tillamook Bay Railroad. We inspect the tunnel; design and sketch repair measures, and perform the repairs. The repairs on this particular tunnel involve designing a series of arches out of structural steel wide flange and filling in the area with heavy timbers.
In late 1997, we had a project with the City of Rockaway Beach, Oregon to rehabilitate two city blocks of their failing public sanitary sewer system. The system needed to remain in operation during the entire process. The challenge on this particular project was that there was a creek affected by tide fluctuations that ran 8 feet wide and up to 6 feet deep that needed to be diverted and de-watered continually to allow the below-grade pipeline and man-holes to be installed, compacted, and tested. The project involved excavation, pvc and concrete pipe installation, concrete man-hole installation and sealing of over 2000 feet of 6” through 10” pvc pipe and 36” concrete man-holes.