Settlement correction work | Identification of localized settlement due to buried debris! Jacking up correction of the pressure-resistant slab.
Subsidance correction work
Precise investigation of localized subsidence of buried waste hidden in the gaps of survey points! Complete restoration of structural safety of the building through pressure plate jacking and high-viscosity resin injection.
Buried waste such as rubble and construction debris lurking in the gaps of ground investigation data can cause irregular ground softening due to aging and uneven load distribution, leading to significant localized subsidence where only parts of a building sink. Since representative point data from tests like SWS cannot capture this, sudden structural cracks or dangerous deformations may occur at specific locations of the shallow foundation. At Geotech, we conduct hand auger drilling and pinpoint subsurface exploration to accurately visualize the location and extent of buried waste as objective numerical data. In the repair process, we apply a space-saving jack-up method using pressure plates, synchronously driving small hydraulic jacks with the building's own weight as a reaction force, and performing precise horizontal adjustments in millimeter increments under constant high-precision laser monitoring. After the lift-up is completed, we inject high-flow air-entrained mortar (air milk) into the voids created under the floor to equalize the ground pressure over the area, while also pressurizing and sealing high-adhesion epoxy resin into the damaged shallow foundation structure to restore its integrity and structural strength beyond that of when it was newly built. Through Geotech's advanced subsidence correction construction menu, we establish lasting structural safety at the foundation level.
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basic information
The construction target is localized subsidence areas in single-family homes (wooden, lightweight steel, cloth foundation, slab foundation structures, etc.). Hand augers and probing rods will be used as survey instruments, and a high-precision digital laser level will be employed for level measurement. For subsidence correction, structural carbon steel plates (at least 12 mm thick and 500 mm square) or concrete pressure plates will be used, and precise lifting will be performed using a small multi-stage hydraulic jack and a linked control device. For foundation reinforcement, high-adhesion epoxy resin injection materials and U-cut seal materials will be used, and lightweight bubble mortar (air milk) will be densely injected to fill the voids at the bottom surface.
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Applications/Examples of results
It is utilized for the restoration of localized differential settlement in existing houses caused by buried garbage and construction debris, as well as for the horizontal restoration of shear cracks in strip foundations and floor inclinations. It is ideal for elucidating localized softening and ground imbalance factors that were not revealed by representative point data from ground surveys, and for quantitatively proving structural safety. It is suitable for situations where one wants to fundamentally restore foundation distortions and cracks and upgrade structural strength beyond that of new construction, as well as for securing the foundation in preparation for future earthquake risks. It is widely used as a high-durability structural reinforcement solution in Geotech's settlement correction construction menu.
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