THE CONCRETE BRIDGE MAGAZINE

SPRING 2017

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/806277

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FOCUS DELIVERING CONCRETE INNOVATIONS Cianbro has adapted to new delivery methods, technologies, and design techniques to construct complicated projects on tight schedules and budgets by Craig A. Shutt Cianbro Corporation has built a reputation for taking on challenging projects and producing cost-efficient bridges that are completed on time. As new delivery methods have developed, the general contractor has thrived, becoming well known for its work in several specific types of concrete bridge projects that often provide signature designs. “Cianbro is a one-hundred-percent employee-owned company, and that commitment aids our drive to deliver on time, with high quality, and on budget,” says Kaven Philbrook, senior project manager for infrastructure at the Pittsfield, Maine-based company. “We have become known in the industry for undertaking very unique, difficult projects where schedule is of the utmost importance.” Founded in 1949, Cianbro has long worked in the railroad industry, gaining experience with a variety of accelerated bridge construction (ABC) techniques as well as skill in constructing efficient movable bridges. Its work with concrete bridges has led to expertise with such specialized structure types as segmental bridges, cable-stayed designs, and arched substructures. “We have become known for doing these projects from Florida to Maine,” says Philbrook. Segmental Designs Segmental concrete bridges have become a key part of the company’s work and offer significant benefits in the right circumstances. “We’re very selective about which segmental projects we take on,” Philbrook says. “If the project presents unique challenges, especially in having aggressive schedules, we are very competitive.” Concrete segmental designs can provide benefits to designs for both superstructures and substructures, says Brenda Nichols, Cianbro’s senior design engineer. Her presentation at the 2016 Construction Practices Seminar, sponsored by the American Segmental Bridge Institute (ASBI) and featured in the Fall 2016 issue of ASPIRETM, outlined benefits of concrete segmental substructure components, such as footings, pier caps, and column units. Benefits accrue similarly for segmental superstructure components, she noted, including speed of erection, reduced user costs, better quality and durability, and improved safety. Philbrook is currently working on a major segmental project, the $170-million Sarah Mildred Long Bridge, a joint venture between New Hampshire and Maine to replace what was reported to be the number-one red-listed bridge in New Hampshire. The new two-level precast concrete segmental box-girder structure connects Kittery, Maine, to Portsmouth, N.H., across the Piscataqua River. When it opens later this year, the upper level will carry vehicles while the lower level will provide rail access. It will include a 300-ft-long movable lift span supported by four 194-ft-tall concrete lift towers.

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