Prevents lifting without damaging the manhole!
The "New Pola Hall PROTECT Method" is a liquefaction countermeasure technique that protects sewage and stormwater manholes with permeable manholes and backfills them with crushed stone. Our permeable concrete has a permeability coefficient of K=1.0 cm/sec or higher, allowing for the instantaneous collection of pore water pressure caused by liquefaction through the permeable manholes and its dispersion through crushed stone. 【Features】 ■ Effective for "rainwater infiltration" and "pressure infiltration" ■ Maintains permeability and breathability ■ Can be utilized as existing drainage ditches ■ Prevents uplift without damaging the manholes *For more details, please download the PDF or feel free to contact us.
Inquire About This Product
basic information
【Construction Procedure (for New Installations)】 1. Excavation, installation of drainage sheet, and bottom plate ring 2. Installation of the first stage of the collection manhole and construction procedure for crushed stone bedding 3. Installation of the bottom plate 4. Adhesion of the bottom plate to the pipe installation wall, typically for sewer and stormwater manhole construction 5. Installation of the pipe installation wall and the vertical and sloped walls 6. Installation of adjustment rings and height adjustment, installation of iron covers and mouth rings 7. Installation of the collection manhole and assembly of the manhole 8. Placement of crushed stone, compacting to a certain extent, protective construction method 9. Laying of drainage sheet 10. Backfilling and paving work 11. Completion *For more details, please download the PDF or feel free to contact us.
Price range
Delivery Time
Applications/Examples of results
For more details, please download the PDF or feel free to contact us.
catalog（1）
Download All Catalogs
Company information
Kokuka Corporation is a comprehensive manufacturer of secondary products made from permeable concrete, consistently engaged in research and development, manufacturing, and sales of various rainwater infiltration products. We are a professional group specializing in permeable concrete. We handle products such as permeable gutters KSU, KU, NFU, permeable boxes, permeable trench KT-1, and sports U-shaped gutters. Please feel free to contact us if you have any inquiries.