Public/Private Facilities: Proposal for Pipe-in-Sleeve Flood Prevention by Design Company

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<Specifications> ●Waterproof performance and test value (smooth inner pipe) 0.1MPa × 72 hours (This product does not guarantee complete waterproofing.) ●Composition - Sleeve material: Rigid polyvinyl chloride pipe (JIS K 6741) VU or VP - Sleeve penetration pipe: Underground buried electric wire protection pipe, Furukawa Electric Co., Ltd. Eflex (or flame-retardant Eflex) - Sealing material: Curing waterproof material filled in 2 locations 'Why is the waterproof performance of the pipe-in-sleeve set to "3 days"?' ◆ Local governments state that "the flooding depth due to floods is 1 to 3 meters, and the duration of flooding is generally half a day to 1 day, but it may last from 1 to 3 days depending on the location." ◆ Emergency power supply systems in hospitals and other facilities are recommended to operate continuously for "more than 72 hours (3 days)" according to laws and guidelines. ◆ The time until the restoration of lifelines during a disaster and the supply system for relief supplies is assumed to be 72 hours. ◆ Time limit for rescue operations: The time during which the survival rate significantly decreases for rescues from collapsed buildings is within "72 hours (the golden 72 hours)."

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*R2.6 Publication of National Transportation Document "Guidelines for Flood Prevention Measures for Electrical Equipment in Buildings" *R3.4 (Public Foundation) Japan Sewerage New Technology Organization "Promotion of Waterproofing (Final Version)" The adoption of these measures in construction work is rapidly increasing. "Pipe-in-Sleeve (abbreviated as PIS)" <Public Facilities / Adoption Records Excerpt> (Statistics from January to April 2026) - Osaka Prefecture, ●● City: Communication equipment and other construction work associated with the expansion of ●●●● - Shizuoka Prefecture, ●● City: Electrical equipment construction for the (tentative name) ●● District Center in fiscal year 7 - Kyoto Prefecture, ●● City: Electrical equipment construction associated with the new building construction of ●● City Hospital (Section 1) - Kanagawa Prefecture, ●● City: Electrical equipment construction for the expansion of ●● Elementary School building No. 1 - ●● Prefecture: Electrical equipment construction for the new building of ○○ Special Needs School Due to the recent shortage of construction workers and skilled labor, there are materials/methods that allow for "easy installation" but underestimate waterproof performance, leading to an increasing trend in leakage problems with underground beams. To prevent leakage accidents from resulting in large-scale repair work later, we advocate for the adoption of Pipe-in-Sleeve (abbreviated as PIS), which combines both "labor-saving at construction sites" and "the soundness of waterproof performance in buildings," as well as the Pipe-in-Sleeve T type (abbreviated as PIS-T), which features a "drainage flange" on the outer circumference of the sleeve.

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