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November 17, 2015

Metallizing from A to Zinc

Metallizing from A to Zinc

Since turn of the 20th century, thermal spray coatings, more commonly known as metallizing, have been used in a broad range of applications. However, this corrosion protection technology has not been widely used in the bridge industry until more recently because of more competitive pricing and updated technologies. Using current technology and modern application techniques, metallized bridge coatings have expected lifespans of at least 20 to…

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October 26, 2015

Slip-Critical Connections and Turn-of-Nut Pretensioning: Practical Specs for Bridge Applications

Slip-Critical Connections and Turn-of-Nut Pretensioning: Practical Specs for Bridge Applications

As explained in our article published on July 23, 2015, entitled Slip-Critical Connections: Use of the Turn-of-Nut Method, this pretensioning method is based on the relative rotation between the nut and bolt head in order to develop the necessary preload tension force in the bolt. This preloading generates a normal force between the faying surfaces and as a result, the required frictional resistance in…

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July 23, 2015

Slip-Critical Connections: Use of the Turn-of-Nut Method

Slip-Critical Connections: Use of the Turn-of-Nut Method

Bolted connections in bridge structures are almost all installed using a torque-controlled tightening method. The use of controlled tightening enables the development of friction force between the plates of the bolted connections; they are therefore slip-critical connections. The resulting friction force allows for an enhanced performance of connections in fatigue conditions, reduces deflections in the structure and prevents bolts from loosening when subjected to impact…

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June 18, 2015

Case Study: The Burgoyne Bridge

Case Study: The Burgoyne Bridge

The Burgoyne Bridge is a new 1,090-ft (333-meter) structure that’s being built over Highway 406 and the Twelve Mile Creek River in St. Catharines, Ontario, which is located in the Niagara Region. The two-lane structure will replace the existing bridge that was built over 95 years ago. The new structure features two lines of 16 box girders, the longest of which measures 84 ft. (25.5…

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April 16, 2015

Metallizing: A Choice Solution for Corrosion Protection of Steel

Metallizing: A Choice Solution for Corrosion Protection of Steel

Steel bridge surfaces are subjected to harsh environmental conditions and therefore require suitable corrosion protection in order to preserve structural integrity in the long term. Several methods are typically used to protect steel components against corrosion, including: Fabrication from a corrosion-resistant alloy (weathering steel) Protection with a coating Combination of both methods Among the different types of protective coatings in use, painting and galvanization are commonly utilized. Another…

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March 19, 2015

Case Study: Memorial Bridge

Case Study: Memorial Bridge

The Memorial Bridge is a first-of-its kind structure that features an innovative and highly-efficient structural design. The bridge crosses the Piscataqua River between Kittery, Maine, and Portsmouth, New Hampshire, and consists of three spans of 300 ft. (91 m) each, with the center span being a movable lift span. This new bridge replaced the structure built in 1922. The old bridge had a long…

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October 16, 2014

Case Study: Gilbert River Bridge

Case Study: Gilbert River Bridge

Built in the scope of the Highway 73 extension project in the Beauce region, the Gilbert River Bridge is a 1,070-ft. (326-meter) structure that was erected 170 feet (52 meters) over the Gilbert River and 34th Street in Notre-Dame-des-Pins, Quebec. The new bridge features eight lines of 11 girders, with each component measuring 11 feet (3.4 meters) tall and weighing up to 48 tons…

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September 2, 2014

Seismic Isolation of Bridge Footings

Seismic Isolation of Bridge Footings

In 2013, Canam-Bridges supplied structural steel components for the reconstruction of an overpass for the Highway 20/73 Interchange rehabilitation project in Lévis, Quebec. This 1,040-ft. (317-meter) curved bridge is supported by five piers that straddle the two highways; each of the deck spans is comprised of six steel girders. The structure was designed by a consortium formed by CIMA+ and Dessau, and the project…

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July 16, 2014

Orthotropic Steel Deck: a Solution for Sustainable Development

Orthotropic Steel Deck: a Solution for Sustainable Development

Orthotropic steel deck is being used more and more in Canada, and the reasons for choosing this solution are many. While professionals opt for this method mainly because of its cost-saving advantages, the benefits extend even further. Orthotropic deck is composed of a steel plate that’s covered by a shop-installed roadway surface. The bottom of the plate is simply stiffened using components that are sized…

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June 4, 2014

Launched-Girder Erection: A Cost and Time-Effective Technique

Launched-Girder Erection: A Cost and Time-Effective Technique

Canam-Bridges participated in the construction of a bridge over the Natashquan River that now links two municipalities in the province of Quebec, Kegaska and Pointe-Parent, which are located approximately 620 miles (1,000 km) north of Quebec City. Until the bridge opened in fall 2013, Kegaska residents had relied on other means, including boat, plane and snowmobile, to meet their transportation needs. This project was executed in…

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June 4, 2014

New Launching Technique Using Counterweights

New Launching Technique Using Counterweights

In recent years, Canam-Bridges has elaborated an innovative bridge erection technique: a launched-girder erection system using counterweights. This method was put to use during the construction of the North Channel Bridge, which connects the City of Cornwall and Cornwall Island in Ontario, Canada and the State of New York in the U.S. Spanning the St. Lawrence Seaway, over 120,000 commercial vehicles and 2,300,000…

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June 4, 2014

Welcome to the Canam-Bridges Blog

Welcome to the Canam-Bridges Blog

In the present day and age where everything is going ever faster and our time is carefully tallied, we all want to quickly obtain answers to our questions. We are now proposing a solution that will help you to find the information you’re looking for, right at your very fingertips. Canam-Bridges has created a blog that, we hope, will become an ally in the execution of your…

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