The Darwin Bridge, on Îles-des Soeurs, is an infrastructure that enables Île-des-Soeurs Boulevard to cross over a bicycle path. This project was the subject of various articles during its construction, namely for the innovative concrete used for its construction. These same characteristics are found in the arrangement located between elements of the infrastucture, and in which prefabricated concrete products were used elegantly and efficiently.

The architects created a set of 51 prefabricated concrete pieces with curved shapes to create a dynamic interweaving of elements forming landings that integrate plants and trees. As each piece is unique, the precaster had to prepare 51 molds of different sizes and angles – one for each piece.

The molds were built using a 5-head CNC machine to obtain unprecedented dimensional precision. These molds were placed horizontally on production tables, with the largest section cast horizontally (laid piece). In architectural concrete, it is essential to have a low concrete slump and controlled casting techniques so that the distribution of aggregates is uniform, without sliding on the inclined wall.

Measures were taken on site before producing the small end-walls so that they fit properly with the lateral structure.