Jurmala city sewerage collection well stabilization and hydro isolation

THE PROBLEM

An extensive sewerage network was built in 2016 as commissioned by the city of Jurmala. In the course of the works, sewerage collection wells of up to 8 meters in depth were also installed. During the installation work, one of the sewerage collection wells had been badly damaged, as a result of which groundwater penetrated through the well´s wall, constantly filling the collection well with water. Consequently, the sewerage collection wells had to be emptied much more frequently than originally envisioned by the city management. This, in turn, caused the sewerage collection wells´ maintenance costs to be considerably higher than planned.

Furthermore, relevant examinations revealed that the load bearing capacity of the soil was not correctly assessed during installation work, and by that time the collection well´s load bearing plate had begun to subside. This situation put the long-term use of the sewerage collection well under a serious doubt.

During a consultation, URETEK Baltic engineering team immediately proposed to the heads of the city of Jurmala a viable solution in the form of URETEK technology, and the work was completed quickly within a few days. Relevant sewage collection wells served the residents of several multi-story buildings on account of which these buildings could not be switched over to another sewerage route.

URETEK Baltic team set very clear goals – the work must be performed quickly and professionally, while failure is not an option.

WORK PROCESS WITH URETEK TECHNOLOGY

First, the sewerage collection well was emptied and washed in order to carry out a more detailed inspection. URETEK Baltic technical team then stabilized the subsoil under the well’s load bearing plate to stop further subsidence. Until the leakage stopped, the surface behind the leaks was injected through the collection well´s wall.

THE RESULT

The same procedure was replicated for all leaks until the desired result was obtained. The work was carried out successfully on two separate days in four-hour work cycles to ensure uninterrupted sewerage use for the multi-story buildings.