The St-Rémi tunnel is showing significant signs of deterioration and the City of Montréal decided to have repair work done, under the supervision of The S.M. Group International Inc.’s. Bridge and Structures team. As expected, the concrete repair work done on the tunnel reduced the available vertical clearing space of the traffic lanes. It is important to know the new precise vertical clearance measurements in anticipation of the installation of the new lighting system inside the tunnel.
In order to obtain the maximum amount of information on the geometry and celling repair, and in the least amount of time in order to limit as much as possible traffic lane closures, our survey team of experts decided to opt for a 3D scanner. This state-of-the-art equipment not only allows for optimal ceiling modeling with high-precision detail readings using 1000 points per second measuring capacity, it also provides the exact areas where concrete spot repairs were done, perfectly delineates repair areas, and indicates area by area the excess thickness where spot repairs were made in relation to the tunnel structure.