Different subsidence countermeasures: Ground replacement method "Columbus+"

basic information

【N value = 0 ultra-soft ground support】 There is a method called "floating foundation method," which is fundamentally the same concept as the Columbus+ method. It is designed so that the total weight of the building matches the weight of the excavated soil from the basement and foundation area. The Columbus+ method also reduces the weight of the building acting on the ground by excavating the soil beneath the foundation, replacing it with geofoam, and thus lightening the building's weight on the ground. As a result, the amount of settlement is significantly reduced. 【What is geofoam?】 ○ It is a lightweight fill material formed using materials such as expanded polystyrene (EPS) and expanded polypropylene through an in-mold foaming method. ○ It is extremely lightweight, weighing 1/100 of soil, yet possesses a compressive strength of 35KN/m² to 90KN/m². It is referred to as geofoam, including those with excellent oil and chemical resistance. ○ It has been confirmed to be durable, with no issues related to corrosion from microorganisms in the soil or damage from termites. ○ The size of geofoam blocks can be up to 1m x 2m x 0.5m thick, making them transportable even in narrow sites. 【Application range and conditions】 ○ Building weight: 6t/m² or less (suitable for wooden to RC structures up to 3 or 4 stories) ○ Must be a flat foundation. ○ Can accommodate N value = 0.

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Applications/Examples of results

【Uses】 ○ Different sinking countermeasures ○ Earthquake measures (vibration reduction) ○ Traffic and factory machinery vibration countermeasures ○ Liquefaction countermeasures ○ When it is difficult to bring in large equipment in a small area ○ When piles cannot be driven due to underground obstacles ○ When wanting to avoid troubles with buried objects like piles at the time of return or after return in a leased land ○ Energy-saving foundation insulation (frost heave prevention effect) ○ When wanting to avoid excavation surveys in designated archaeological areas If you have any difficulties where other methods are hard to apply, please contact us. 【Track Record】 ○ General residences ○ Commercial facilities ○ Nursery schools and kindergartens ○ Public institutions ○ Medical and welfare facilities ○ Factories and offices ○ Apartment buildings, etc. A total of 4,000 cases nationwide (as of August 2020) For more details, please contact us.