Columbus+ Method: Ground Replacement Technique Resistant to Liquefaction

basic information

【Unique Liquefaction Countermeasures】 Ground liquefaction occurs primarily in saturated loose sandy soils during significant earthquakes. It is a phenomenon where sand behaves like a liquid. The Columbus+ method mitigates the impact on the ground by removing heavy soil beneath the foundation and replacing it with lightweight and compression-resistant "Geofoam." Additionally, by installing a drainage material called "Foamed Drainage Material" in appropriate locations, it adjusts and dissipates the excess pore water pressure caused by liquefaction. 【What is Foamed Drainage Material?】 ○ It is made of the same foamed resin body as Geofoam, with a void ratio of about 30% and drainage functionality. ○ When liquefaction occurs, the foamed drainage material separates the soil and water, allowing only water to be discharged, thereby suppressing the outflow of soil. ○ It has cushioning properties equal to or greater than those of Geofoam. ○ The entire surface is sealed with a thin non-woven fabric, preventing clogging and the intrusion of soil or sand. 【Results of On-Site Investigation in Urayasu City】 The damage from differential settlement was suppressed compared to other buildings. Detailed materials are available, so please inquire. 【Scope and Conditions for Application】 ○ Building weight: 6t/m² or less (suitable for wooden to steel structures, approximately 3 to 4 stories of reinforced concrete) ○ Must have a flat foundation. ○ Can accommodate an N value of 0.

Price information

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Delivery Time

Applications/Examples of results

【Uses】 ○ Different sinking countermeasures ○ Earthquake countermeasures (vibration reduction) ○ Traffic and factory machinery vibration countermeasures ○ Liquefaction countermeasures ○ When it is difficult to bring in large equipment in narrow spaces ○ When piles cannot be driven due to underground obstacles ○ When wanting to avoid troubles with buried objects like piles during or after the return of 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 feel free to 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.