Settlement correction work | Repairing cracks in the foundation and local settlement with steel pipe piles to restore value!
Subsidance correction work
Fundamental solution for local subsidence and cracks in the foundation! A structural repair that utilizes the building's own weight to drive steel pipe piles into the supporting layer, protecting asset value.
Localized subsidence and cracking occurring in the foundation of residential buildings are significant structural issues caused by uneven ground subsidence and localized softening. If left unaddressed, the tilt of the building will further increase, leading to a substantial decrease in asset value and reduced seismic resistance. The subsidence correction work provided by Geotech utilizes the building's own weight as jack reaction force and employs a steel pipe pile pressing method, where high-strength steel pipe piles are driven deep into a hard support layer. Piles are precisely anchored at the locations of localized subsidence, and accurate leveling is restored through precise jacking. Additionally, epoxy resin injection is applied to the cracks in the foundation concrete to restore structural strength, and high-density filling of air bubble mortar is used to raise the ground bearing capacity in areas of subsidence and underground voids. Construction can be carried out while residents are living in the home, minimizing noise and vibration, and compressing the construction period and costs to a minimum. We will permanently protect the structural safety and asset value of your important home.
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basic information
This construction method uses general structural carbon steel pipes (with an outer diameter of 114.3 mm or more and a wall thickness of 4.5 mm or more) according to the JIS G3444 STK400 standard. The weight of the building is used as a reaction force to press-fit the steel pipe piles with a small hydraulic jack, securing them into a hard support layer with a thickness of 2 m or more and a converted N value of 10 or more based on SWS test data. For crack repair, a high-durability epoxy resin injection method is employed, and lightweight foamed mortar (air milk) is used to fill voids and subsided areas in the subfloor ground. The pile bearing capacity and the safety factor of the foundation anchorage are secured and fixed based on structural calculations.
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Applications/Examples of results
It is used for correcting local subsidence of cloth foundations in single-family homes, small stores, and apartments, as well as for correcting uneven corners and reinforcing foundation cracks. It is ideal for structural reinforcement work aimed at repairing inspection items identified during the sale of used homes and for reattaching residential ground guarantees. It is widely applicable for subsidence repairs in occupied homes where temporary relocation is difficult, reinforcement work in narrow sites where large machinery cannot enter, and foundation renovation work aimed at preventing future differential settlement and extending the lifespan of buildings.
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