In recent weeks, the closing segment of span 3 of the Double Cantilever Viaduct for Western access to the Vasco de Quiroga Station, on the Mexico-Toluca interurban railway, has been executed.

With the execution of the closing segments in each of the spans, the deck stops behaving structurally as a double cantilever embedded in central piers and becomes a continuous beam embedded in the central piers and simply supported on the two abutments.

We address an execution phase of special relevance in this type of construction processes by advancing in double cantilever, where the importance of correct monitoring and adjustment of the deflections of the two cantilevers that connect with the closing segments to give continuity to the deck.

The length of concrete viaduct is 191.70 m. It is divided in 3 spans of 58.7+85+48 meters and it is executed with a double balanced cantilever construction system. The deck section is a single cell box, 11.5 m wide and variable depht, starting at 5.5 m in the surroundings of the columns and reducing to 3.45 m in the center of the main clearing. For the execution of segments, 4 formwork travellers supplied by VSL International Ltd. are being used.

The original project of the Viaduct has been developed by Sener. IDEAM | A TYLin Company is collaborating with OHLA with the technical assistance during the execution, especially in the camber definition and checking both the deformed deck and the instrumentation, while executing the sections and the instrumentation.