Ground reinforcement work | The Σ-i method generates reliable bearing capacity through calculations directly linked to survey data.
Directly calculate the allowable bearing capacity from SWS tests and ram soundings! The Σ-i method supports reliable structural design with clear technical basis and digital management.
To ensure the structural safety of buildings, it is essential to correctly evaluate the soil data and equivalent N values obtained from ground surveys and to select the optimal ground reinforcement work. If the foundation is laid while the ground strength is insufficient, uneven settlement can occur, leading to irreparable issues such as distortion of the structure and damage to the walls. The "Σ-i Method" (Sigma-i Method) provided by Geotech Co., Ltd. is a pile-type ground reinforcement technology that has established a rational method for calculating allowable bearing capacity using the results of SWS tests and automatic ram sounding tests. The four excavation blades at the tip of the steel pipe and the integrally formed spiral wings exhibit excellent penetration thrust, smoothly reaching the target bearing layer and acquiring significant tip bearing capacity. The rotary insertion method, which does not use cement-based solidifying materials, generates no construction waste (excess soil), thereby reducing disposal costs and on-site processing costs. It has obtained GBR-C performance certification from the Japan Building Comprehensive Testing Institute and provides highly transparent and reliable construction under a digital construction data management system.
basic information
The Σ-i method is a reliable technical specification that has obtained the Architectural Technical Performance Certification from the Japan Building Disaster Prevention Association (GBRC Performance Certification No. 10-13 Rev. 2). The main shaft diameter standards range from φ89.1 mm to φ165.2 mm, and the tip spiral wing diameter is available in a lineup from φ270 mm to φ400 mm. The maximum construction depth from the ground surface can accommodate up to 130 times the main shaft diameter. Applicable ground types include sandy soil (including gravelly soil) and cohesive soil. Objective allowable bearing capacity calculations can be performed based on the equivalent N values from SWS tests and dynamic cone penetration tests.
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Ground reinforcement work
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This construction method is optimal for small-scale buildings such as single-family homes, multi-family residences, and stores that are three stories or less, with a height of 13 meters or less, and a total floor area of 1,500 square meters or less (for single-story buildings, 3,000 square meters or less). It also accommodates foundation reinforcement for retaining wall structures with a height of 3.5 meters or less. Since it allows for design calculations that are directly linked to ground investigation data such as SWS tests, it is widely used at sites that aim for clear justification in building confirmation applications and structural calculations, as well as for rational and economical foundation reinforcement that minimizes excessive design.
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