大建 List of Products and Services

"Tametotto" is an underground rainwater storage tank that collects large amounts of rainwater with a quality comparable to drinking water through a simple construction process over a short period. The rainwater is purified in the gravel layer inside the tank, allowing it to be used safely in a state almost equivalent to drinking water quality. Additionally, this tank has been recognized for its advanced initiatives and has received requests from the United Nations Human Settlements Programme (Habitat). 【Features】 ■ Easy installation, capable of being completed in a short period ■ Can be used safely in a state almost equivalent to drinking water quality ■ Microorganisms living in the gravel purify the water in about two weeks, maintaining a stable quality comparable to drinking water (alkaline) ■ The impact on construction and material costs due to variations in void ratio is minimal ■ Water temperature remains stable around 20°C for almost the entire year *For more details, please refer to the PDF document or feel free to contact us.

• Rainwater tank

The "NCZ Method" developed by our company is a construction method that enhances the seismic resistance and liquefaction resistance of houses while providing a comfortable underground space. By connecting the foundations of the house with an artificial ground, it creates a large "solid foundation" that is strong against earthquakes and liquefaction. Additionally, due to the large underground structure, it can maintain a stable condition regardless of the soil conditions. [Features] - High seismic resistance and liquefaction resistance, strong against disasters - Underground construction costs are about half or less compared to conventional underground houses *For more details, please download the PDF or feel free to contact us.

• Ground foundation construction method
• Earthquake-resistant construction method
• Housing structure technology/long-term superior housing technology