Construction Manager General Contractor, Innovative Delivery Model for a Bridge Project in Ontario

摘要

The Construction Manager, General Contractor (CMGC) is a new alternative contract delivery model for the Ministry of Transportation Ontario (Ministry). The intent of CMGC is to form a collaborative team, between the owner, designer and a contractor, which begins in design and continues throughout construction. During design the contractor provides construction expertise and constructability input into the design with the intent to become the general contractor during construction. In 2011, MTO initiated its first CMGC project, the Cayuga Bridge replacement project. The Cayuga Bridge constructed in 1924 is a five span, 190 m long, steel through truss bridge is at the end of its' life. This Grand River crossing provides access to the community of Cayuga and carries gas and telephone utilities. With no alternative crossing nearby, closing the bridge to accommodate construction for two years is not a viable option. Adding to the complexity of the project, the Grand River provides habitat for many endangered aquatic species, and the west banks of the Grand River are identified to be a significant archaeological site with artifacts dating back to 8000 BC. Through the collaborative CMGC team approach, an innovative construction staging design was completed that minimized environmental and archaeological impacts while maintaining traffic and utility services throughout construction. This paper will include the rationale for selecting the CMGC model, an overview of how the model works and how the work has unfolded on the Cayuga Bridge project.