Highway73/20 interchange overpass

Designed for Quebec’s harsh weather conditions, the laboratory tests performed for this overpass seismic isolators were a first in Quebec.

Built in the middle of the Highway 73/20 interchange in Lévis, the A-ramp overpass is a structure that highlighted CIMA+’s engineers expertise. With a total length of 331 m and a 270 m curve, this overpass required seismic isolators to be tested in a laboratory to verify their effectiveness at temperatures below -30 °C, a first in northern regions. Installed under the structure, seismic isolators allow for dissociating overpass pillars from ground movements in the event of an earthquake. Furthermore, using them allowed to reduce costs and construction delays.