Ground reinforcement work Σ-i method [Performance certification method]

basic information

This is a reliable specification backed by the "Building Technology Performance Certification" (Performance Certification No. 10-13 Revised) from the Japan Architectural Comprehensive Testing Institute, a general incorporated foundation. The tip wing diameter (Dw) accommodates a variety of combinations ranging from 270mm to 400mm, and the steel pipe shaft diameter (DP) ranges from 89.1mm to 165.2mm. The diameter of the wing section is designed to be 2.5 to 4.0 times the diameter of the steel pipe shaft, providing strong support capacity. The long-term allowable support capacity (Ra) is set at one-third of the ultimate vertical support capacity (Ru) and is calculated in accordance with the support capacity calculation formula Ru = αsw・N'・Ap (support capacity coefficient αsw=125). The tip wings are managed by lot numbers, and a strict consistent management system is established by "design and construction management engineers."

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Applications/Examples of results

This is a highly versatile reinforcement method suitable for various ground conditions, including sandy, gravelly, and cohesive soils. It is accurately designed based on in-situ investigation data from Swedish sounding tests and dynamic cone penetration tests. Its main applications include ground reinforcement measures for three-story wooden houses, small concrete buildings, L-shaped retaining walls, and buildings close to retaining walls. Due to its high penetration driving force, it can be easily embedded into hard bearing layers, and it has a wealth of application experience even in tight sites with limited adjacent environments, using small construction machinery such as crawler-type pile drivers.