ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.
Issue link: http://www.aspiremagazinebyengineers.com/i/306189
F O C U S 8 | ASPIRE , Fall 2011 Contractors usually call on McNary Bergeron & Associates only when the going gets tough—and that's just the way the company's engineers like it. The firm specializes in taking complex d e s i g n s a n d m a k i n g t h e m m o re constructible, ensuring the owner and designer's vision becomes reality. That has led the 8-year-old company into some high-profile and extremely challenging concrete projects. "We usually get involved in projects that are complex," says Scott McNary, a principal in the Broomfield, Colo.-based construction engineering firm. "We work on the problem children, the projects that are difficult to build. And we enjoy those challenges." The company's goal is simple, adds Principal Jim Bergeron, who heads the firm's other office in Old Saybrook, Conn. "Our niche is to help contractors and designers be successful. We can bridge the gap between design and construction because we speak both languages." The firm was founded in 2003 by McNary and Bergeron along with Jeremy Johannesen. All three had experience with large engineering firms prior to partnering. "We wanted to get back to our roots of working directly with contractors to help them with the construction of complex bridges," Bergeron says. Since easily designed projects seldom need construction engineering support, the engineers u s u a l l y a re w o r k i n g o n c o m p l e x projects. Those often involve concrete construction—or ones that become concrete during the value-engineering process, says Johannesen. "We do some designing, especially when value engineering is required," he says. "But 90% of our work is construction engineering of existing designs to make them more efficient to build." Fast Start with Hoover Dam M o s t c o m m i s s i o n s r e s u l t f r o m r e l a t i o n s h i p s w i t h d e s i g n e r s o r contractors with whom the partners h a v e w o r k e d o n p a s t p r o j e c t s , McNary explains. Those connections helped them become part of a high- profile project shortly after the firm was created: The Hoover Dam Bypass Colorado River Bridge in Nevada and Arizona. The company provided construction engineering services for the cast- i n - p l a c e a rc h s t r u c t u re a n d t h e temporary stay-cable system used to support it. That work included design of the anchorages, towers, and cable construction for the arch ribs as well as the rib shop drawings and an independent review of the form-traveler design. "There were many challenges involved in bringing that design to fruition," says Johannesen. "We basically worked with the contractor to create a tower and anchorage system that would streamline the concrete construction. The end result worked extremely well." The company's expertise in arch work paid off when it became involved in the Covered Bridge over the Kennebec River in Norridgewock, Maine, which has just been completed. The project f e a t u re s a c a s t - i n - p l a c e c o n c re t e tied arch spanning 300 ft. McNary Bergeron provided construction analysis for the new arch and erection plans and procedures, as well as design of the temporary arch shoring and a demolition plan for the existing arches. (See the article on this bridge on page 34.) by Craig A. Shutt Bridging the Gap McNary Bergeron provided construction engineering for the cast-in-place arch structure and temporary stay-cable system used to support the Hoover Dam Bypass Colorado River Bridge. It was one of the first high-profile projects for the company, which was founded in 2003. All photos: McNary Bergeron & Associates Inc. McNary Bergeron's construction engineering work helps ensure efficient and cost-effective construction Book_Fall11.indb 8 9/29/11 11:59 AM