Withstanding groundwater pressure

The floor of an underground car park was found to be unable to withstand groundwater pressure, leading to significant cracks and deformations of the floor of this car park.

As the floor was located at a depth of 4 metres below groundwater level, a solution was anything but obvious.

Future Foundations worked out a detailed implementation method based on micro piles subjected to tensile loads, which were then finished watertight. Future Foundations' solution was selected by the engineering firms and experts involved. The work was thoroughly prepared and then carried out using electric crawler drills suitable for working in confined spaces.

Next up, Future Foundations was also responsible for the injection and waterproofing works to re-dry the car park.

A one-component polyurethane injection resin was used to seal wet cracks, while a two-component polyurethane resin, which cures without the presence of water, was used for dry cracks. Moreover, openings in the floor were sealed with swell seals and kicker plates to ensure durable waterproofing.

The execution was fully in line with the agreed planning and quality requirements and led to the predetermined result.