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why the floor subsides

The cause is always the same — changes in the physical and mechanical properties of the soil beneath the slab or screed. However, there can be several contributing factors:

• soil saturation due to emergency water leaks;

• washing out of fine particles;

• insufficient compaction of the base during construction;

• technogenic loads (equipment, warehouse racks, transport);

• rising groundwater level.

Soil is not concrete — it is a living material. Its structure changes over time, especially under moisture conditions. When the deformation modulus decreases, the slab begins to move and eventually subsides.

The method is based on controlled injection of a mineral solution beneath the slab through small-diameter boreholes.

Technological scheme:

• drilling holes in the slab Ø 30–50 mm;

• installation of injectors;

• delivery of a cement-silicate solution under controlled pressure (up to 0.8 MPa);

• the solution fills voids, densifies the soil, and forms a rigid reinforced mass;

• due to volume expansion and base compaction, the slab is lifted to the design level.

As a result, a new geotechnical composite is formed — a dense mass with an increased deformation modulus. Within 28–30 days, the base reaches its design strength.

advantages of the method

✔ no floor dismantling

✔ no interruption of facility operation

✔ minimal openings — local intervention

✔ no vibration impact

✔ suitable for high groundwater levels

✔ controlled lifting of the structure

Unlike full slab replacement or installation of new piles, injection is a precise engineering solution with predictable results and significantly lower costs.

where floor lifting is applied

The method is effective for:

• industrial floors in warehouses and production facilities;

• shopping centers;

• parking structures;

• logistics complexes;

• private houses;

• administrative buildings.

Especially relevant for facilities with high point loads — racking systems, machinery, and equipment.

technical control and calculation

Before starting work, the following is carried out:

• engineering and geological analysis;

• assessment of structural condition;

• identification of weakened zones;

• calculation of injection volumes.

After completion, control may include:

• geodetic monitoring of settlement;

• static or dynamic probing;

• determination of the actual deformation modulus.

The goal is not only to lift the slab but to ensure long-term base stabilization.

why you shouldn’t delay repairs

Settlement is a cumulative process. If addressed early, the volume of injection works is minimal, and results are achieved faster. If delayed until cracks appear in load-bearing structures, the budget and complexity increase significantly.

Geotechnics does not tolerate delays. The soil is working every day, even when it is not visible.

Lifting and stabilization of sunken floors using injection technology is a modern engineering solution that restores load-bearing capacity, returns the floor to its design level, and prevents repeated deformations.

If level differences, cracks, or local failures appear on your site, it is a signal to conduct a technical inspection. A solution exists — and it is far more efficient than full-scale dismantling.