Project: Tennis court (sports facility)
Location: Switzerland
Year: 2011
Duration: 2 days
Technology: SLAB LIFTING
The 80 m2 of sunk area has been raised by an average of 50 mm
Problem
Deformation of the surface of some court areas
Solution
Filling voids and leveling floor structures
Problem
The Taverna tennis school, operating since 2006, has 4 outdoor courts and 3 courts in a large indoor hall. Over time, the foundation of the covering on some sections of the indoor courts “sank”, leading to depressions incompatible with the correct and safe use of the courts. According to the customer, this happened due to a violation of the floor covering technology and water ingress under the slab.
Goals
The goal was to compact the foundation over approximately 80 m² of flooring distributed across 3 sections, restoring the original flatness and level. The work was not to cause any unwanted (excessive) lifting of the floor level, nor was it to significantly impede the functioning and use of the structure.
Goals
The goal was to compact the foundation over approximately 80 m² of flooring distributed across 3 sections, restoring the original flatness and level. The work was not to cause any unwanted (excessive) lifting of the floor level, nor was it to significantly impede the functioning and use of the structure.
The project in detail
Technology applied:
Using URETEK slab lifting technology, technicians filled voids under the floor slab by injecting expanding geopolymers developed specifically for this type of work.
The chemical polymerisation reaction time is very short. This feature allows the material to remain in the work area closest to the injection point, without dispersing too far. This allows precise lifting of structures to within 1 mm. The load‑bearing layer of the foundation soil was found at a depth of 0.10 m from the bottom of the floor slab. The holes, drilled with a diameter of less than 8 mm, were made in the floor and extended to a depth of 0.80 m, and were spaced at equal distances. Thus, it was possible to accurately fill the entire volume of voids and compact the loosened foundation. At the end of drilling, injection tubes were placed into the holes using a perforator. Injections were carried out at two different depth levels, starting from the uppermost. Injections were made at levels of 0.20 m and 0.80 m from the bottom of the floor.
Using URETEK slab lifting technology, technicians filled voids under the floor slab by injecting expanding geopolymers developed specifically for this type of work.
The chemical polymerisation reaction time is very short. This feature allows the material to remain in the work area closest to the injection point, without dispersing too far. This allows precise lifting of structures to within 1 mm. The load‑bearing layer of the foundation soil was found at a depth of 0.10 m from the bottom of the floor slab. The holes, drilled with a diameter of less than 8 mm, were made in the floor and extended to a depth of 0.80 m, and were spaced at equal distances. Thus, it was possible to accurately fill the entire volume of voids and compact the loosened foundation. At the end of drilling, injection tubes were placed into the holes using a perforator. Injections were carried out at two different depth levels, starting from the uppermost. Injections were made at levels of 0.20 m and 0.80 m from the bottom of the floor.
Solution
As they expanded, the polymers strengthened the foundation in the injection area, restoring contact between the foundation and the floor. Moving to the second phase of injections, it was possible to precisely lift the settled sections. The vertical lift of the floor is an indicator of the project’s effectiveness. The expansion process of the materials essentially causes soil compaction in different directions. During the work, vertical movements of the floor covering were monitored using laser instruments with millimetre accuracy. The average lift was 50 mm. The work, which levelled about 80 m² of area, was completed in two working days.
NAVIGATION
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