Construction is possible only on the inside of the manhole! Inner weight method.
The "Inner Weight Method" can be constructed only from the inside of the manhole, making it relatively easy to implement even on busy main roads and in urban areas with many surrounding buried utilities. It is based on the simple principle of increasing the weight of the manhole, making its apparent specific gravity nearly equal to the unit weight of liquefied ground. The simplicity of the principle and design makes it easier for sewer operators, road managers, and local residents to understand, facilitating smooth project advancement. 【Features】 ■ Construction is possible only from the inside of the manhole ■ The apparent specific gravity of the manhole is increased to be nearly equal to the unit weight of liquefied ground *For more details, please download the PDF or feel free to contact us.
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**Function and Performance** ■ Function: It can be used for floating prevention measures for existing and newly constructed assembly manholes from circular size 0 to size 5 according to the Sewer Association standards (A-11). The installation of the floating prevention device does not compromise the original performance of the assembly manhole. ■ Performance: The method of increasing the weight inside the manhole has been confirmed to have excellent effects on floating prevention through model vibration experiments. (The experiments were conducted in collaboration with Professor Koji Kunio of the Soil Mechanics Laboratory at Chuo University’s Faculty of Science and Engineering.) *For more details, please download the PDF or feel free to contact us.*
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The Floating Prevention Manhole Industrial Association is an industry organization that develops and promotes methods for preventing the floating of sewer manholes due to liquefaction. Please feel free to consult us when considering floating prevention measures.