August 18, 2022 1:00 pm
James Fu, P.E., State Bridge Engineer, Hawaii Department of Transportation; Eric Y. Matsumoto, S.E., Vice President, KSF, Inc.; and Gary T. Iwamoto, Director of Construction Services, KSF, Inc.
Description: The 100-year-old historic Waikoko Bridge was severely damaged during a storm event in 2018 that produced floods and extensive damage throughout the area. The bridge along with the nearby Waipa Bridge required replacement. Access through this route was severely impacted, with resident access limited to certain hours of the day. KSF, Inc. proposed a two-precast-girder solution with precast deck, placed during a single weekend closure, to meet the Hawaii DOT’s need for an innovative way to replace the bridges while work continued throughout the area to repair flood damage. All time-consuming work was done without affecting travel on the existing single-lane bridge. Once the micropile foundations were completed, the precast girders and deck units were placed nearby to facilitate placement. The roadway was then closed and the bridge replaced over the weekend. The Waipa Bridge was similarly completed. This method eliminated a costly temporary bypass bridge and the significant ecological effects the temporary bridge would have had on the wetlands adjoining the existing bridges. Design and construction details and lessons learned will be discussed.
James Fu, P.E.
State Bridge Engineer
Hawaii Department of Transportation
James has worked for the Hawaii Department of Transportation in the Bridge Design Section for over 30 years and has been the State Bridge Engineer since 2017.
Eric Y. Matsumoto, S.E.
Eric is a bridge designer for KSF, Inc. in Honolulu, Hawaii. He graduated with a BSCE and MSCE from the University of Hawaii. For 29 years, Eric has worked on various infrastructure projects throughout the State of Hawaii. In recent years, he has worked closely with the local contractors in the design, fabrication and erection of precast members.
Gary T. Iwamoto
Director of Construction Services
Gary has over 40 years of experience in bridge construction and engineering and has worked on a variety of bridges throughout the State of Hawaii, including bridges in H-1, H-2, and H-3, as well as having extensive experience with work on neighbor islands that have a large inventory of bridges along two-lane roads that do not have alternate routes.