Japan Platform for Redesign: Sustainable Infrastructure (JPRSI)

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Verty liner construction method

Technology / Service Summary

This is a "self-supporting manhole rehabilitation method" that rehabilitates concrete corrosion and aged manholes caused by hydrogen sulfide.


Reconstruction and extension of service life of aged and damaged manholes.


① Self-supporting type that does not require the strength of existing manholes
② If there is no problem with the finished shape after construction and rehabilitation, there is no need to repair the cross section.
③ Integrated rehabilitation of slanted and straight walls
④ Corresponding to earthquake resistance level 1 and 2


Reconstruction and life extension of aged and damaged manholes.
Acid-resistant glass fiber and photo-curing resin are used as the rehabilitation material, forming a high-strength rehabilitation manhole in a short period of time.
The thickness of FRP reclaimed material can be designed according to site conditions.

Controlled Substance

Applicable Regions / Countries

  • Japan


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Locations for inspection

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Related SDGs Goals

  • 6. Clean Water and Sanitation
  • 11. Sustainable Cities and Communities
  • 13. Climate Action
  • 14. Life Below Water

Verty liner construction method