TOM PETRAY, P.E. - Chief Engineer

Major Assignments (back)
BridgesOther Marine StructuresPorts & HaborsStructural Engineering

Bridges (top)
  • Johnson Street Bascule Bridge, Victoria, B.C.
    Lead designer for a large, modular, lift-in, float-in cofferdam. Primary design components included modular precast concrete form slabs, a cast-in-place concrete bottom slab, modular wall panels, and a sophisticated lowering system. The cofferdam was constructed by suspending the components from the production drilled shaft piles and then lowered into place and grouted to the piles. This cofferdam eliminate the need for a 18 foot thick seal slab which would have been required for a conventional cofferdam at great savings to the owner and contractor. See Johnson Street Bridge paper in Publications and Project Reference Sheet for further details.
  • SR-520 Floating Bridge, Seattle, WA.
    Lead designer of a unique, 1,200-ton capacity T-Lift-Pontoon that fit between pairs of supplemental bridge pontoons for float-out in the Port of Tacoma. The weight of the supplemental pontoons varied from 2,500 to 2,800-tons each and the T-Lift-Pontoon reduced the draft by 4 feet so they could be cast in a shallow basin. See Project Reference Sheet for further details.
  • Tilikum Crossing Transit Bridge, Portland, OR
    Assisted in design and analysis of in-water pier caps for a 1560 foot long main span cable-stay bridge on drilled shaft foundation. Also, involved in alternate design for drilled shaft foundation to reduce number and size of shafts and decreased pile cap size. See Project Reference Sheet for further information.
  • Tellico Canal Crossing, Knoxville, TN
    Lead designer for a large, modular, float-in cofferdam. Primary design components included modular precast concrete floating slab, modular wall panels, and a lowering system. The cofferdam was constructed by supporting the components on a barge during construction, lowering the cofferdam from the production drilled shaft piles and grouting the cofferdam to the piles for uplifting resistance. This cofferdam concept eliminate the need for a 12 foot thick seal slab which would have been required for a conventional cofferdam and therefore greatly reduced seismic loadings and provided significant savings to the owner and contractor.
  • Manette Bridge, Bremerton, WA
    Provided construction engineering of a 1550 foot long precast concrete spliced girder bridge at the Port Washington Narrows. Primary role consisted of developing innovative girder erection methods and falsework design, which eliminated all in-water temporary falsework and facilitated an accelerated construction schedule. See Project Reference Sheet for further information.
  • Four Bears Bridge, New Town N.D.
    Construction engineering for a 4500 foot long precast concrete segmental bridge (balanced cantilever) across the Missouri River. Primary role consisted of foundation construction engineering including cofferdam and driving template design of precast segment erection equipment.
  • Veterans' Glass City Skyway, Toledo, OH
    Construction engineering for 1,225 foot long main span, precast concrete segmental cable stayed bridge, with 7,300 foot approaches. Role included assistance in design of the 105-foot diameter footing cofferdam for the main pylon and design of falsework for main pylon construction.
Other Marine Structures (top)
  • WTP#4 - Lake Travis Raw Water Intake, Austin, TX
    Lead designer for extensive falsework, drilling platforms, pile driving, and heavy lifting operations. Falsework design minimized under-water activities in water depths exceeding 100 ft. This falsework design allowed an accelerated construction schedule and resulted in extensive cost savings to the contractor. See Project Reference Sheet for further information.
  • IHNC Floodgate Cofferdams, New Orleans, LA
    Mr. Petray assisted with design and analysis of confferdams for 3 separate floodgates as part of 100-year storm surge protection barrier for the City of New Orleans. Project required cofferdams totaling over 80,000 square feet for construction of floodgate structure. Primary role was in design of sheet pile walled cofferdams with steel bracing and concrete tremie seal slabs. See Project Reference Sheet for further information.
  • Ruskin Dam, Vancouver, BC, Canada
    Design of temporary float-in bulkhead cofferdam spanning 130 feet to replace the up to 3 tainter gates at one time. The bulkhead was required to be movable so that it could be used in 3 different stages and support 30 feet of water head. Mr. Petray's primary role consisted of structural analysis and connection design for the bulkhead framing and lifting/sliding systems. See Project Reference Sheet for further information.
  • Elliot at Seawall Project, Seattle, WA
    Mr. Petray designed the temporary containment system and shoring systems for construction of 3/4 mile of replacement seawall along the Seattle waterfront. Mr. Petray was the lead designer for multiple shoring solutions including post and lagging, sheet pile, open cut, cantilevered and anchored shoring systems.
Ports & Harbors (top)
  • Port of Los Angeles Berth 200-214 Repairs, Los Angeles, CA
    Mr. Petray was the lead designer for innovative falsework systems, and pile driving template. For reconstruction of the Port of LA. The falsework system was cantilevered, modular, and re-usable for multiple configurations while providing an open area for construction.
  • Port of Los Anchorage, Anchorage, AK
    Mr. Petray was the lead designer for specialty pile lifting device and pile tipping frame. The piles for the project were 6-foot diameter, 250 feet long and more than 50 tons. The devices and tipping bed allowed for safe picking and tipping the horizontal large diameter pile to the vertical position for driving operations.
  • Port of Tacoma Pier 4 Expansion, Tacoma, WA
    Mr. Petray was the lead designer for extension falsework systems, fall protection systems, and electrical systems foundations. The projects consists of reconfiguring and expanding Pier 4 at the Port of Tacoma to provide for the new generation of mega-ships to dock at the port. The falsework systems made extensive use of pile friction collars and readily available materials that the contractor already had on hand for maximum economic value.
Structural Engineering (top)
As a design engineer with KYSE-Structural Engineers, Mr. Petray was involved with structural analysis and design of several buildings in the central US, including:
  • Cornerstone St. Francis Center - Denver, CO
  • Campbell County Field House and Recreation Center - Gillette, WY
  • St. Francis Medical Center/Cancer Hospital - Cape Girardeau, MO
  • Infinity Park Conference Center - Glendale, CO