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  5. Site and ground investigation
  6. Site Investigation | Prevention of Settlement Defects in Uneven Ground at the Site of a Demolished Wooden Apartment Building

Site Investigation | Prevention of Settlement Defects in Uneven Ground at the Site of a Demolished Wooden Apartment Building

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Site investigation

last updated:Sep 10, 2026

ジオテック
ジオテック
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Quantify the risk of uneven ground subsidence lurking in the site of a demolished structure through multi-point penetration tests, in order to prevent accidents and defects after the handover of wooden apartments.

This technology is a ground diagnosis service that precisely identifies the risk of uneven ground subsidence lurking in the demolition site of wooden apartment buildings, preventing uneven subsidence accidents and defect liability issues after handover. In the demolition site of old structures, insufficient compaction of backfill soil and underground obstacles can easily lead to significant strength discrepancies within the site, raising concerns about tilting incidents occurring after the building's completion. This service employs multi-point screw weight penetration tests (SWS tests) to meticulously measure penetration resistance values at various depths, visualizing uneven strata structures and localized weak areas. By calculating and simulating the estimated deformation angles (building tilt) from the resistance differences between measurement points, we quantitatively verify the impact on the structure. By providing objective and highly reliable ground data along with detailed analysis reports, we facilitate the smooth passage of third-party ground guarantee reviews and dramatically reduce after-risk for business owners and builders. We protect the asset value and business reliability of the completed apartments over the long term.

    Site and ground investigationGeological Survey CompanyGeological Survey
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Site Investigation | Prevention of Settlement Defects in Uneven Ground at the Site of a Demolished Wooden Apartment Building

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  • Related Link - https://www.jiban.co.jp/service/survey/boring.htm
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basic information

This survey method adopts the Screw Weight Sounding Test (SWS test) in accordance with JIS A 1221, and precisely measures the penetration resistance values at multiple locations throughout the site. The measurement depth corresponds to a maximum of 10 meters below the foundation, and the incremental load application (25 kg to 100 kg) and half rotations are accurately recorded. In data analysis, the Inada method for converting N values is applied to calculate the allowable bearing capacity according to the characteristics of cohesive and granular soils. Furthermore, a strict assessment based on a unique three-item, eight-element criterion (strength, shrinkage, deformation, etc.) is conducted, and a ground assessment report is issued and bound.

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Applications/Examples of results

It is used primarily in new construction and rebuilding projects on the sites of demolished wooden apartments to prevent differential settlement accidents and defect compensation troubles after completion. It serves as a technical basis for determining the suitability of direct foundations such as slab foundations and strip foundations on construction sites where the ground hardness has become uneven after demolition work, as well as for assessing the necessity of surface ground improvement and columnar improvement. It is widely used as evidence materials when construction companies and real estate developers apply for third-party ground guarantee systems, as well as a safety certification tool for apartment owners.

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Site Investigation | Measurement Method for Settlement Risk of Uneven Ground at the Site of Demolished Wooden Apartment Buildings and After Compensation Prevention through Compliance with Guarantee Review | Geotech

Site Investigation | Measurement Method for Settlement Risk of Uneven Ground at the Site of Demolished Wooden Apartment Buildings and After Compensation Prevention through Compliance with Guarantee Review | Geotech

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Ground investigation service "Standard Penetration Test"

Ground investigation service "Standard Penetration Test"

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Ground Investigation | Uneven Ground Settlement Asset Preservation Analysis and Optimal Foundation Design to Ensure Long-term Structural Safety at the Site of a Demolished Wooden Apartment | Geotech

Ground Investigation | Uneven Ground Settlement Asset Preservation Analysis and Optimal Foundation Design to Ensure Long-term Structural Safety at the Site of a Demolished Wooden Apartment | Geotech

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