Ground reinforcement work Σ-i method [Performance certification method]
Advanced pile-type ground reinforcement Σ-i method that has obtained architectural technical performance certification.
This is a highly reliable pile foundation reinforcement method for small-scale buildings, including residential structures. It features a new spiral-shaped tip wing integrated with four excavation blades at the tip, allowing it to penetrate the ground while rotating. The rotary insertion construction minimizes vibration and noise, and it establishes an environmentally friendly design that generates no excavated soil (residual soil) during construction. Furthermore, by adopting an improved tapered tip wing, it allows for the selection of several types of steel pipes for a single tip structure, successfully achieving dramatic cost reductions and economical design while maintaining high construction performance and safety.
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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S-i Method
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.
