A aing attending at the Hwy. 99/Broadway Avenue arch by the Minnesota Department of Transportation showed accretion bane but no analytical issues.
The assay led to the all-embracing activity actuality downgraded from fair to poor, but MnDOT admiral said inspectors didn’t acquisition annihilation acute actual action. A decline to poor is one of the triggers for backup or rehabilitation, but this arch is already on the slate for rehabilitation in the 2017 architecture season.
The analysis address will comedy a role in aing year’s project, said Jed Falgren, District 7 arch engineer.
“We’ll booty the advice from this inspection, accompany it to the designers and ask them, ‘Are there any updates from the 2016 analysis to make?’” he said.
The basics of the almost $4 actor rehabilitation plan won’t change, but some accommodation might. Crews will aish crumbling concrete, sandblast backpack blight on the steel, reinforce bandage beams and repaint the arch to a aphotic green, which was the accepted blush for bridges in the 1930s, the time of the bridge’s aboriginal construction. The accurate accouter will be relaid and crews will alter the ablaze standards, or posts and lights.
The arch was originally appointed for rehabilitation in 2014, but the activity got pushed aback afterwards an affair with bids.
The bridge, which is on the National Register of Celebrated Places, is on a account of bridges inspected every added year by an Oakdale MnDOT team. The bridges are advised breach critical, acceptation that it has elements were they to fail, the arch is in crisis of collapse.
“In bridges we architecture now, there is a primary way of captivation them up and there’s additionally a bombastic way that would additionally authority the arch up if the primary agency were to fail,” Falgren said.
These bridges get a closer, added complex inspection. Drivers apparently noticed the inspection, which bound cartage to one lane at a time on May 16 and 17. While best MnDOT inspections booty a brace of agents a brace of days, the Hwy. 99 arch had bristles inspectors attractive at it for about three days.
The better aberration is that the inspectors use accelerated animate array testers. Blight wears through steel, abrasion it. The crews did acquisition abrasion and some baby holes in some animate beams acknowledging the bridge.
“There are a few places with baby holes,” said Falgren afterwards reviewing the Twin Cities’ aggregation address May 26. “It’s absolutely about corrosion.”
The crews did accept a few challenges because of the abnormal arch structure. For example, it was difficult to get some of the accessories to ability beneath the bridge, which “comes with the territory” for celebrated bridges.
While there were not analytical issues that appropriate actual changes to Hwy. 99 bridge, Falgren said the District 7 and Twin Cities arch agents would abide to attending at photos to see if any amount brake changes are needed.
“We accept some restrictions on abundant cartage already, but we could abate the amount capacity,” he said.
And there may be some aliment on the banal sidewalk side.
Falgren said the bane issues are allotment of a accustomed activity aeon for bridges.
“It isn’t abundant of a surprise,” he said. “Ongoing abasement will abide to happen.”
Reach Associate Editor Nancy Madsen at 507-931-8568 or chase her on Twitter.com @SPHnancy.
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