Ground reinforcement work | Establishing a foundation design based on evidence using the DM method of GBRC performance certification.
Ground reinforcement work
DM method for obtaining GBRC performance certification. High-reliability ground reinforcement that meets building confirmation applications and design reviews, supported by clear calculation basis and bolt connection technology.
GeoTech Co., Ltd. offers the "DM Method (Double Metal Method)," a ground reinforcement technique using small-diameter steel pipe piles that provides high structural reliability based on technical certification from public institutions. In ground reinforcement work aimed at constructing safe foundation structures, this method has obtained the GBRC performance certification (No. 10-01) from the Japan Building Disaster Prevention Association, allowing for clear design justification in application and design review processes. By employing a unique structure that bolts large wings made of ductile cast iron (3.0 to 3.5 times the diameter of the steel pipe) to the tip of the pipe, it completely eliminates the uncertainties of on-site welding, ensuring reliable tip support strength. The use of a no-dirt, cement-free rotary penetration method prevents the generation of excess soil disposal costs and noise issues. Through rigorous quality control inspections at our own factory, a nationwide construction network, and a real-time penetration torque and depth tracking system using construction management devices, we ensure high transparency and traceability, delivering the highest quality and peace of mind ground guarantees to our clients.
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basic information
The Japan Architectural Comprehensive Testing Institute has obtained GBRC performance certification (No. 10-01). The used steel pipe has a diameter of 101.6mm (STK400), and the tip is constructed by joining an enlarged wing (290mm/350mm) made of ductile cast iron (FOD450A) with fixed bolts. The applicable ground consists of sandy soil and clay with an average equivalent N value of 5 to 15, and the maximum construction depth can accommodate up to 130 times the diameter (13.2m). Based on the SWS test, it is possible to reliably calculate the allowable strength of the reinforcement materials.
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It is ideal for single-family homes, apartments, and stores with three floors or fewer, a height of 13 meters or less, an eaves height of 9 meters or less, and a total floor area of 500 square meters or less, as well as for the foundation reinforcement of retaining walls and structures with a height of 3.5 meters or less. It is recommended for architectural projects that require public design justification during structural evaluations and administrative confirmation applications, as well as for small-scale structures in large-scale subdivision developments and public-related construction that undergo strict reviews. With clear technical specifications and thorough construction data management, it strongly supports the practical work of design offices and housing manufacturers.
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