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/296997
A Stable Foundation The pier and abutments feature a deep foundation system consisting o f 7 - i n . - d i a m e t e r m i c r o p i l e s e x t e n d i n g i n t o t h e c l a y a n d s i l t y s a n d s b e n e a t h t h e a q u e d u c t s u p p o r t i n g m o re t h a n 1 0 0 0 t o n s of water, concrete, and stone load. The 65-ft-long micropiles featured a concrete filled upper steel casing, w i t h a l o w e r 5 0 - f t - l o n g g ro u t e d bond zone. In addition to their high axial and lateral capacity, micropiles were ideally suited for this project site given the small footprint of the installation equipment, the ability to drill through potential obstructions, and the need to minimize vibrations o n t h e s u r r o u n d i n g m a s o n r y abutments. Bringing Back the Water On September 22, 2011, after a year of construction, the original canal system was restored and the waters of the Ohio & Erie Canal flowed once again over Tinkers Creek as they have done for the past 166 years. Unlike its predecessors, the new, all concrete aqueduct structure will provide Cuyahoga Valley National Park and its visitors with a functional piece of history well into the twenty-first century. ____________ Anthony Borrelli is the New York bridge division manager for Bergmann Associates in Rochester, N.Y., and the projectÕs engineer of record. F o r a d d i t i o n a l p h o t o g r a p h s o r information on this or other projects, visit www.aspirebridge.org and open Current Issue. A E S T H E T I C S C O M M E N T A R Y by Bradley C. Touchstone Sometimes the most valued historical assets are created to solve a specifc challenge in a clever and innovative way. Such is the case with the Ohio & Erie Canal Aqueduct over Tinkers Creek. It would be unreasonable and dishonest to rebuild the aqueduct as originally constructed. When restoration is not possible, the Advisory Council on Historic Preservation encour- ages us to create replacements that utilize current methods and materials to capture the essence of the original structure while avoiding mimicry. The new aqueduct design pays homage to the original structure through the use of form, scale, and texture. At the same time, the replacement is built using the latest construction techniques and materials in a manner that is clearly of its time. The use of concrete for the superstructure in lieu of the original materials makes perfect sense. Concrete has a unique ability to accommo- date requirements for span length, durability, and water tightness. Use of form liners to develop a rusticated pattern on the superstructure face further illustrates the fexibility of this material. The patterns used soften the appearance of the bridge and will allow the bridge to age in an elegant fashion. The resulting restoration project adheres to the guidance of the Advisory Council on Historic Preservation and subtlety and cleverly updates the original structure while maintaining the mystique of this entertaining and informative aqueduct for all who visit. Elevation view of the new aqueduct and fully reconstructed masonry pier. Photo: Henry G. Russell Inc. ASPIRE , Winter 2013 | 35 AspireBook_Win13.indb 35 12/28/12 11:40 AM