Settlement correction work | High-precision horizontal repair of foundation settlement and cracks using steel pipe piles!
Subsidance correction work
Thoroughly solving local subsidence and cracking of fabric foundations caused by earthquakes and ground movement! A technology that performs millimeter-level horizontal restoration and structural reinforcement using steel pipe pile driving and high-precision measurement.
Local subsidence and cracks in the foundation caused by seismic shaking and consolidation changes in weak ground lead to significant tilting and a dramatic decrease in the seismic resistance of homes. The subsidence correction work carried out by Geotech resolves these issues using a steel pipe pile driving method, where steel pipe piles are driven into a hard support layer under the weight of the building, monitored in real-time to the millimeter with the latest laser measurement systems. Hydraulic jacks are linked to precisely lift the building without adding stress, correcting it to its original level at the time of construction. At the same time, high-adhesion epoxy resin is injected into the cracks of the damaged foundation to fully restore structural strength and waterproofing performance, while high-strength bubble mortar (air milk) is densely injected to fill the cracks and voids that have formed in the subfloor due to subsidence. The work can be done while residents are living in the home, with no need to move to temporary housing, and is completed in a short period with minimal noise and vibration. This simultaneously improves the building's seismic performance and ensures lasting structural stability.
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basic information
This construction method uses general structural carbon steel pipes conforming to the JIS G3444 STK400 standard (with an outer diameter of 114.3 mm or more and a wall thickness of 4.5 mm or more). While continuously monitoring minute displacements with a laser height measurement device, the steel pipe piles are pressed in using hydraulic jacks, with the weight of the building serving as the reaction force. The penetration depth is firmly anchored to a support layer with a thickness of 2 m or more and a converted N value of 10 or more, based on ground survey data. High-strength epoxy resin is used for crack repair, and air-entrained mortar is filled in underground voids, securing the foundation anchorage.
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Applications/Examples of results
It is used for structural repairs of single-family homes and small buildings that have developed cracks or local tilting in their fabric foundations due to earthquakes or differential settlement. It is ideal for sites where there is a desire to restore the seismic performance and waterproofing of the foundation itself, along with correcting floor irregularities. It meets the needs of homeowners who wish to carry out construction while living in the property, minimizing temporary housing rent and relocation costs. Additionally, it is widely utilized for earthquake countermeasures and secondary disaster prevention work in preparation for future major earthquakes or ground movements, backfilling and reinforcing voids in the subfloor ground, and comprehensive longevity renovation work for fabric foundations that have deteriorated over time.
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