Stopping the subsidence of Riga tramway, restoring its bearing capacity and re-levelling the concrete slabs

Riga authorities decided that during the renovation of the tramway tracks the heating system pipeline that was running under the tracks had to be replaced as well. As the location of the pipeline changed after the construction of the technical line, it was decided that the pipeline was to be installed by way of boring. Unfortunately, boring operations resulted in decreased density and settlement of the ground, which in turn led to uneven settlement of slabs under the tracks.

URETEK’s team performed the works at night, when the trams were not operating. First and foremost the settled area was identified, following which cavities in the ground were filled by injections of geopolymer resin.

When the ground surface was stabilised and its loadbearing capacity restored, the slabs and tracks were again raised to their initial height. The entire work process took 4 hours, and this method was the most efficient way to solve the given problem.