Related Links: Time-Lapse Video of Skagit Bridge Replacement Oregon Bridge Truss Travels On Teflon-Coated Tracks Time was of the essence: It was even built into the bidding process as a key factor in the $8.5-million project to replace the collapsed Interstate 5 bridge over the Skagit River in northwest Washington state.On Sunday, Sept. 15, crews from winning contractor Max J. Kuney Co., Spokane, made good on the firm's bidding commitment by sliding into place the state's first lightweight concrete bridge, with a 19-hour closure of the four-lane interstate connecting Seattle to Vancouver, B.C.Everything about the project was fast-tracked following a
Image Courtesy of Trimet Special cable-stayed design calls for permanent stays to connect to every other bridge segment and continuously run through the pylon, a tactic that allows for a slender cross section. Image Courtesy of Trimet New Willamette River crossing in Oregon will be nation's first to bar private vehicles. Related Links: Light-Rail Bridge Job Awarded Portland-Milwaukie Light Rail Bridge There's no wiggle room in Portland, Ore., regarding the aesthetics and geometry of the new cable-stayed Willamette River bridge that, at 1,750 ft, will be the country's longest mass-transit, non-car commuter crossing. All 78 of the 16-ft-long, cast-in-place bridge
Barnhart/Dawn Paul Barnhart's modular lift tower placed the TBM's 745-ton cutterhead on May 31. Related Links: Bertha to Dig This Summer Follow Bertha on Twitter Lowering a 7,000-ton tunnel-boring machine piece by piece into an 80-ft-deep launch pit sloped 3° forced Barnhart Crane and Rigging to think outside the boom. The subcontractor working at the Alaskan Way Viaduct in Seattle opted to use a modular lift tower instead of a conventional crawler crane, saving millions of dollars and valuable site space.The largest tunneling machine built for North America, Bertha—a 57.5-ft-dia unit—will this summer bore a 1.7-mile-long tunnel to replace the
Photo and Rendering Courtesy of WSDOT Officials are scrambling to replace part of a bridge that collapsed after an oversized-load truck struck it. Carrying Interstate 5 in northern Washington state, the bridge is one of thousands that lack redundancy in their critical members. Fast-track construction methods will be used for both temporary and permanent fixes to restore Washington state's main north-south connector, from Seattle to Canada, after the May 23 collapse of an Interstate 5 bridge span into the Skagit River.Washington State Dept. of Transportation officials took less than 72 hours to announce that a temporary structure will be in
Related Links: Planned Coal Export Terminals Spur Opposition in Northwest Coal Facilities Face Challenges Three of six Washington and Oregon coal-port proposals are dead. Three plans remain: two along the Columbia River—one in Oregon, the other in Washington——and another near Canada, north of Bellingham, Wash.Proposals in Grays Harbor, Wash., Coos Bay, Ore., and, most recently, St. Helens, Ore., have all been killed.Houston-based energy giant Kinder Morgan is the latest to drop out, suspending coal-terminal plans at the Port Westward Industrial Park at the Port of St. Helens. The $200-million project—still in a due-diligence phase prior to permitting—was yanked because site
Photo Courtesy of Goldieblox Inc. GoldieBlox (above) makes learning about engineeringincluding how a belt drive worksfun for girls, says its Stanford U. engineering grad developer Debra Sterling. Photo Courtesy of Goldieblox Inc. Related Links: Goldieblox Official Website National Academy of Engineering's Engineer Girl Don't let the GoldieBlox story confuse you.The toy isn't just about a ballerina music box—it's about ripping the box apart and putting it back together. It's about building a spinning machine to develop spatial skills.But it's also about a female engineering grad from Stanford University who aims to make the engineering field more appealing to young girls.
Photo Courtesy of Port of Anchorage Expansion plan features U-shaped cells backfilled with earth and gravel to create new land. Related Links: Port of Anchorage Homepage Port of Anchorage Info from World Port Source The $700-million Port of Anchorage expansion project is stalled in court, where the engineer says its design is not to blame.PND Engineers Inc., a Seattle-based firm with offices in Alaska, designed the 135-acre expansion using the open-cell sheet-pile style to limit corrosion and persistent ice buildup on pile-supported docks. The design drives steel sheets into U-shaped cells, which are backfilled with earth and gravel to create
Related Links: Cracks Delay Floating Bridge Project Test Pontoon Prepares Team For Real-Time Construction Flaws in the design led to cracks during post-tensioning of the first four concrete pontoons built for the replacement of the world's longest floating bridge in Seattle, says the Washington State Dept. of Transportation. The fix could cost tens or even hundreds of millions of dollars and potentially delay the $4.13-billion project.In detailing a report from a blue-ribbon review panel, state Transportation Secretary Paula Hammond maintained that the pontoons—designed to a 75-year life cycle—are structurally sound. But the report revealed that five cracks up to .03
Photo Courtesy of Omega Morgan A 3,400-ton truss bridge slid onto a beam setup and traveled in an arc at a painstaking pace to avoid hitting nearby homes. Photo Courtesy of Omega Morgan Related Links: Vermont Bridge Slides Into Future A Bridge Slips And Slides Into Place Cleveland Crossing's Smooth Slide Massive Truss Rolls Into Place About eight inches per push—that is how the 3,400-ton Sellwood Bridge moved forward on Jan. 19 in Portland, Ore. The owner, Multnomah County, moved the 87-year-old, 1,100-ft-long steel truss 66 ft to the north using the span as a detour bridge, while a joint
