Surface Preparation and Painting of Quebec Bridge
Quebec City, Quebec
The Québec bridge the longest cantilever, steel railway bridge in the world. The bridge was constructed in 1919, and spans the St. Lawrence River between the cities of Charny and Sainte-Foy close to Québec City.
During the initial construction, two catastrophes occurred. In 1907, the south anchor arm and a portion of the center span failed. The resulting design changes significantly increased the weight of the structure. Further in 1910, the pre-fabricated center span fell, while being raised into position. The Québec Bridge is considered a fragile structure.
The project entailed the surface preparation and repainting of the existing steel structure. The project extended to six phases over a period of 10 years. The total cost of the project was estimated at $60 million.
Originally the project specified sand blasting operations; this method of surface preparation proved too costly and an alternate method, consisting of water jetting was used, producing a substantial savings.
The first phase of the project was estimated at $8.2 million, taking place during the 1999 and 2000 construction seasons. Engineering and financial resources are a great challenge. When considering a lead removal project there are two main concerns; the environment and the containment.
Challenges to this project included:
- Designing scaffolding on a fragile structure.
- Designing containment to hold the water from the water jetting operations.
- Protecting the environment.
- Performing the work within a stringent budget, as both environmental protection and containment entail increased costs.
Revay and Associates was mandated by the general contractor to prepare an expert report on the delays incurred during the execution of the contract.