Ready, section of the Interurban in Santa Fe

After five months of work, the civil work of the bridge that was built over La Hondonada, in Santa Fe, was ready.

It is only a 220 linear meter section of the elevated viaduct of the Mexico-Toluca Interurban Train, but that, due to the irregularity of the terrain, required a construction procedure known as double cantilever, which is rare to be used in the infrastructure of the Mexico City.

The double cantilever involves assembling the bridge from above, more than 60 meters high, without using conventional cranes, because the irregularity of the terrain does not allow them to be supported correctly.

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For this construction method, two cars mounted at the top of the viaduct were used, which support and accommodate the concrete segments that weigh up to 200 tons.

The first voussoirs to be placed were those closest to the three support columns known as “starter voussoirs”, They are the largest and heaviest since they reach 200 tons.

Then, more voussoirs are placed, which move away from the support columns so they become “overhead”.

The further away the voussoirs are from the support columns, their size and weight is reduced; the last ones to be installed are about 60 tons.

The voussoirs are placed simultaneously on both sides of the support columns, hence the name “double cantilever”.

Currently, the procedure is being carried out to place the last two segments known as “closing” segments.

In total, 43 voussoirs were placed to form the bridge that crossed the La Hondonada ravine, which is located next to Prolongación Reforma and the Mexico-Toluca highway.

This part of the elevated train viaduct is located between the stations Santa Fe and Vasco de Quiroga.

UNCOMMON CONSTRUCTION

Israel Domínguez, spokesperson for the Ministry of Works and Services (Sobse), indicated that this is a special work worthy of appreciation by the capital's residents, because it is not common in Mexico City to build in ravines or ravines.

The complexity of the maneuvers to place the monumental concrete pieces is high, since they must be exact, which is an engineering challenge.

It is a challenge, it is a technique or a procedure that we will very rarely see in Mexico City, if they pass through the area it is a work worth appreciating,” he considered.

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