When the Ministère des Transports Quebec (MTQ) required a temporary detour solution for their bridge replacement project on Autoroute 40, near Berthierville, a Mabey Delta Bridge System from Algonquin Bridge filled the gap.
Cantilevered launch from one side without lifting equipment
The design and launch sequence of Mabey Modular Panel Bridges are innovations that date back to the original Bailey Bridges of WWII. The launch was executed from one side using a fully-cantilevered sequence with a 10-bay launch nose. When all was ready, on-site equipment nudged the structure across the river to the opposite side (see video at end of article).
First of many deployments for the MTQ
The contractor, Roxboro Excavation Inc., erected and launched the bridge with guidance from Algonquin’s on-site advisors. The steel decking and parapet systems were installed prior to launch, in order to reduce the amount of work done over the river.
The MTQ will own the Delta system after this deployment, and will be able to reconfigure and redeploy it for future projects. It is designed with a minimum life of 25 years with an average traffic of 13,000 vehicles per day at a speed of 70 km/h.
Pre-cambered truss system for longer-term or permanent highway applications
Able to achieve clear spans of up to 90 m, the Mabey Delta Bridge system uses the innovative 4.5 m long ‘Delta’ panels. The panels are bolted to top and bottom chord members to form the side trusses, carrying the applied loads between abutments and/or intermediate piers. Delta trusses are provided with a positive pre-camber to counter the effects of dead load deflection.
Project Name: MTQ P-09806 Detour Bridge
Location: Berthierville, QC
Owner: Ministère des Transports Québec
Designer (Consortium): CIMA+ / Dessau
Contractor: Roxboro Excavation Inc.
Application: River Crossing Product: Modular Panel Mabey Detour Bridge, Delta (single span)
Dimensions: span 67.5 m, width 8 m (two-lane)