ETP-G method for ground reinforcement using steel pipe with advanced wings that has obtained GBRC performance certification.
This is an environmentally friendly ground reinforcement method using advanced winged steel pipes, which has obtained the architectural technical performance certification from the Japan Architectural Comprehensive Testing Institute (GBRC Performance Certification No. 09-19 Revision 5). It employs steel pipe piles equipped with disc-shaped wings at the ends, enhancing penetration by providing 30mm notches above and below the wings, and effectively suppressing deviation during construction with the aid of a drilling assist bit at the tip. Ground surveys are typically conducted using the Screw Weight Penetration Test (SWS Test), and in cases where the supporting layer is deep or the ground is difficult to penetrate, a large dynamic cone penetration test (SRS Test) can be accurately employed. This method offers a clean, environmentally friendly solution with low vibration, low noise, and no generation of residual soil.
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basic information
There are seven types of pile diameters ranging from 89.1mm to 216.3mm, and a rich variety of 45 types of wings, allowing for economical and appropriate design. The applicable soil types include sandy soil (including gravelly soil) and cohesive soil. The long-term allowable vertical bearing capacity is accurately calculated based on the strength index (average value $\overline{N}'$) obtained from SWS tests or SRS tests, using the bearing capacity calculation formula $LRa=\frac{1}{3}\alpha_{sw}\cdot\overline{N}'\cdot Ap$ (with a bearing capacity coefficient $\alpha_{sw}=140$). The maximum construction depth is specified as 130 times the pile diameter and 19.2m during SWS testing, and 130 times the pile diameter during SRS testing. In accordance with the ETP-G construction standards, reliable construction is carried out even in limited spaces using small pile drivers and construction vehicles.
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It is optimal for ground reinforcement in small-scale buildings with three stories or fewer and a height of 16 meters or less. Furthermore, it can be widely applied to foundation reinforcement and ground improvement works for small structures such as retaining walls under 3.5 meters in height, as well as septic tanks and billboards, where consideration for the environment and landscape is required. The machinery used for construction, such as small pile drivers and pole erectors, allows for completion of work without causing a sense of pressure on the surrounding area, even in narrow sites or densely populated residential areas. The vibration and noise generated during construction are extremely low, and there are no disposal costs for surplus soil that would become industrial waste, making it highly effective in tight urban development projects that require a high level of consideration for neighboring properties and the surrounding environment.
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