大亜ソイル List of Products and Services

The "NS Eco Pile" is a revolutionary rotary-driven steel pipe pile developed by Nippon Steel Corporation (formerly known as Nippon Steel & Sumitomo Metal Corporation). It is a steel pipe pile with spiral wings welded to the tip, allowing for construction with no soil displacement, low noise, and low vibration by rotating and driving the steel pipe using a full rotary machine. <Features> ■ No soil displacement… No mud or residual soil is generated. ■ Low noise and low vibration… Achieves low noise and low vibration construction through the rotary driving method. ■ Usable with general machinery… Construction can be performed using general machinery such as three-point support pile drivers and full rotary machines. ■ Retrievable… The pile can be extracted and removed by rotating it in reverse. This is effective for temporary construction. *For more details, please download the PDF or feel free to contact us.

• Special Construction Method

During concrete placement, protect the hole walls from horizontal holes, drainage ditches, and other underground water. This prevents collapse and the inclusion of soil and impurities, enabling the construction of high-quality piles. By covering the pile shell with a Resophon net, it is possible to prevent concrete runoff even in soft ground such as peat layers and landfill sites, as well as in ground with flowing water. The pile shell is covered with a Resophon net, which helps prevent hole wall collapse. <Features> ■ Versatile use… Applicable to various methods such as earth drilling, all casing methods, and underground continuous wall methods. ■ Over 200 successful projects… Extensive experience in public works such as those by the Ministry of Land, Infrastructure, Transport and Tourism, as well as in private construction. ■ Simple construction method… Uses a permeable synthetic fiber (made of polyethylene) mesh fabric. In addition to being economical, it is lightweight and easy to handle. *For more details, please download the PDF or feel free to contact us.

• Special Construction Method

Bored concrete piles using steel pipes with protrusions (welded molded protrusions) that excel in integration with concrete on the inner surface of the steel pipe. The protrusions can be selected from two types: one located at the lower part of the steel pipe and the other at the upper and lower parts. They can be chosen according to design conditions, achieving low cost and high quality. Acquired evaluation from the Japan Building Center, a general incorporated foundation: - BCJ F-560 (July 31, 1990) - BCJ Evaluation-FD0416-03 (January 29, 2016) <Features> ■ Earthquake resistance… High bending resistance and holding capacity. Excellent safety during earthquakes. ■ Economic efficiency… High design flexibility allows for the selection of structural types according to design conditions. ■ Environmental consideration… The pile diameter can be slimmed down, reducing the amount of excavated soil. *For more details, please download the PDF or feel free to contact us.

• Earthquake-resistant construction method

The "HND method" is a construction technique that involves using an earth drill excavator's drilling bucket to excavate the shaft of a pile to a specified depth in the bearing layer, and then using a bell-shaped bucket to expand the excavation in a conical shape, creating a cast-in-place concrete pile with a larger tip area. As a result, it achieves bearing capacity equivalent to that of a straight pile, and compared to straight piles with the same load-bearing capacity, it significantly reduces the amount of excavated soil and concrete, allowing for not only a shortened construction period but also cost savings. 【Features】 ■ By using a belled pile, equivalent bearing capacity can be achieved even with a smaller shaft diameter. ■ Reduction in concrete volume and excavated soil volume. ■ Reduced environmental impact. *For more details, please download the PDF or feel free to contact us.

• Ground foundation construction method
• Pile and foundation work