DBM Saves Money for Oregon DOT Project

Job Location: US 26:Cornell Rd.-OR 217 Section Sunset Highway, Beaverton, OR

Project Owner: Oregon Department of Transportation (ODOT)

Project Description: DBM Contactors Inc. provided a value-engineered design-build solution that saved the Oregon DOT in excess of $150,000 on its $1.15 million portion of the $34 million highway improvement project. DBM utilized a non-reticulated micropile wall instead of traditional drilled shafts for the 617 lineal-foot retaining wall on US-26, Cornell Road in Beaverton, Ore.

The permanent earth retention wall was directly adjacent to the westbound lanes on a busy four-lane highway. Lane closures were not permitted during the project requiring DBM and the general contractor, Mowat Construction Company, to provide traffic maintenance facilities in order to utilize the existing shoulder for construction staging. Despite winter weather conditions and heavy traffic the job was completed on schedule.

DBM crews drilled 230 micropiles at approximately two-feet to four-feet on center. The micropiles consisted of roughly seven and one half inch diameter steel casing with a one and three fourths inch central reinforcing steel bar, and extended up to 30 feet deep. Ninety eight permanent tieback anchors were installed at a steeply inclined angle from horizontal in order to remain within the existing right-of-way. The anchors and micropiles were tied together with a reinforced concrete grade beam to complete the retaining wall structure.

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