News & Resources

The Michels Insider

What's New at Michels

Curved tunnel extends limits of microtunneling

Congratulations to our crew and project partners for extending the limits of microtunneling technology. Michels completed an exceptional 470-foot drive under the Tualatin River in Tualatin, OR in less than a month. The 84-inch diameter tunnel features a vertical “U” curve with a 650-foot radius – a North American record for the tightest curve radius at this diameter.

Michels used a new Herrenknecht AVN 1800 machine with double-steering articulation to navigate the radius of the curve and a jacking system to install a specialized reinforced concrete pipe.

The microtunneling drive is part of a design-build project being executed with Mortenson for Clean Water Services.

Share!
Enjoy the article so far? Recommend it to your friends and peers.

Michels Corporation 
Copyright © 2018

Individual commitment to a group effort - that is what makes a team work, a company work, a society work, a civilization work.

Vince Lombardi

Great teamwork can do great things.

Contact Us