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The URETEK DEEP INJECTIONS technology was developed to stabilize and compact soils under foundations and slabs. The DEEP INJECTIONS technology is capable of compacting subsoils and filling voids to many meters of depth in order to stabilize the structure, without having to wreck the foundation or any part of it and without major excavations. The stabilization of the sunken structure is controlled throughout the injection process.
Unlike the URETEK SLAB LIFTING technology the purpose of URETEK DEEP INJECTIONS technology is not the lifting of the structure, but the compaction of deeper soil layers. The process can be used directly under the structure, down to 7 m of depth. In specialized cases even deeper layers can be handled.
Once the resin has been injected into the ground it begins to expand in all directions like the roots of tree. Naturally this expansion is greater in the direction of less resistance - more material penetrates there. Therefore the weaker soils are automatically compressed first and only thereafter the more compacted soils - less material penetrates there. This feature of the technology guarantees that every void is filled and every weak soil zone is stabilized.
The effect of the resin expansion is measurable in close proximity regions (soil dependent 70-150 cm), even where the resin is not physically present, since the injected resin generates a pressure in the soil, which results in compaction. When the compactness of the soil is enough to support the pressure from the building, then the expansion of the resin will lift the structure by a small amount (0.1 - 0.3 mm). This reaction is measurable at every injection point and assures the the injection was successful. We measure the lifting of the structure with an instrument during the injections. The method is patented internationally.
Contrary to traditional methods, the URETEK injections do not require part of building to be wrecked or excavation of ditches to be performed. Therefore we can work safely. In many cases only the sidewalk or floors are drilled through. The URETEK technology is many times faster then traditional methods. In general weeks or months can be saved with this method.
In order to plan the injection - to determine the injection zones, a dynamic soil density test is needed in most cases. In more complicated cases a full geotechnical and structural report will be required for the planning.
In almost all cases we prepare the injection holes with hand tools. Therefore the method can be use in hard to access basements and pits also. The bore holes prepared at a distance of 1-2 meters do not weaken the structure in a measurable way, because in most cases the bore holes are 16-40 mm in diameter and normally the rebars are not cut. The injection is performed through thin pipes, one per layer, up to the planned depth. The whole technology is closed system.
The technology can be used in almost all types of soils. However the application has some limitations for soils where the organic content is significant or where the expansive clays are present. When the damage is caused by the the soil sliding in a horizontal direction, the intervention has to be planned with care. Normally in these cases the URETEK injections can only be done along with other stabilizing interventions, with common technical supervision required.
The specially developed URETEK resins have a high compressive strength, which adjusts to the surrounding requirements. The resins are water resistant and do not absorb water and do not diminish due to the elements naturally found in the soil. The URETEK DEEP INJECTIONS method can be applied for every type of foundation and building type, from family dwelling to large industrial plants. Massive buildings like historical monuments, apartment buildings and churches do not represent an obstacle to the URETEK technologies.
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