Ground reinforcement work | Trust in GBR-C performance certification and high-quality ETP-G method
Ground reinforcement work
Reliable technical expertise in obtaining GBRC performance certification! The ETP-G method protects buildings with rational calculations based on SWS testing and an ISO-compliant quality management system.
To ensure the long-term safety of buildings, the selection of objective and reliable ground reinforcement methods is essential. The ETP-G method provided by Geotech is a highly reliable rotary driven steel pipe pile method that has obtained the Building Technology Performance Certification (GBRC Performance Certification No. 09-19) from the General Incorporated Foundation Japan Building Disaster Prevention Association. This method allows for the calculation of allowable vertical bearing capacity using clear formulas based on standard ground survey results such as SWS tests and SRS tests, enabling evidence-based safe foundation design. Its unique structure, featuring a disc-shaped enlarged wing at the tip and an excavation auxiliary bit, simultaneously exhibits high penetration capability and tip bearing capacity, robustly supporting small-scale buildings with three stories or fewer and a total floor area of 1,500 square meters or less, as well as retaining walls. The non-displacement construction method that does not use cement eliminates the need for soil disposal, achieving reduced environmental impact through low noise and low vibration. Furthermore, our company provides a high-precision construction system that reliably prevents differential settlement by having the construction management technology department conduct internal controls in accordance with the ISO 9001-compliant quality management system, and by ensuring thorough on-site construction management and pre-start inspections and quality checks by qualified personnel.
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basic information
The ETP-G method is equipped with reliable technical specifications that comply with performance certification from third-party organizations. The outer diameter of the shaft steel pipe ranges from φ89.1mm to φ216.3mm (a total of 7 types), with a wall thickness of 3.2mm to 12.7mm, and materials used include STK400 and STK490. The disc-shaped enlarged wings at the tip come in 45 variations with diameters ranging from 223mm to 620mm (thicknesses of 12mm to 22mm, material SM490A, etc.). Applicable ground types include sandy soil (including gravelly soil) and clayey soil, with precise calculation formulas applied based on SWS test and SRS test results. The maximum construction depth is 19.2m (less than 130 times the pile diameter).
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This construction method is ideal for building projects that require public standards and reliable support strength evidence. It targets small structures with three stories or fewer, 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), as well as retaining walls, septic tanks, billboards, and other structures that are 3.5 meters or less in height. Since it has obtained a technical performance certification from a public agency (GBRC performance certification), the application for confirmation and technical explanations can proceed smoothly. Additionally, because it is a non-excavation, low-noise, and low-vibration rotary penetration method, it is widely used for ground reinforcement work in sites where excavated soil cannot be removed and in educational facilities and densely populated residential areas where environmental considerations are emphasized.
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