Outline of 3S Segment Method

After assembling hard plastic segments with bolts and nuts on the inner surface of facilities such as circular pipes and rectangular culverts (pipe culverts, manholes), a cement-based filler is injected between the inner wall surface of the culvert facility and the segments. It is a construction method that integrates the pipe facility, filler, and segment, and enables the restoration of high-strength, super-large pipe facilities.


          Φ59" Construction Sample

     □185"×110" Construction Example

  1. High strength and life extension is possible because a rehabilitation pipe is newly installed inside the existing pipe.
  2. The grouting status can be clearly confirmed by using transparent segments.
  3. The resin material of the segment can be selected according to the application.
  4. Lightweight and easy to install because it is made of plastic.
  5. No need for large-scale and advanced machinery.
  6. Temporary construction interruption is possible.
  7. Can be installed while running water.
  8. Applicable not only to pipe rehabilitation but also to others (for secondary lining).
  9. Partial repair is possible.
  10. Finished inner diameter can be designed according to the condition of the pipeline.
  11. Gradient adjustable.
  12. Applicable to secondary lining of underground structures.


 ※ Pipeline Facility Where People Can Enter

Round Pipe

31” 157”

Culvert Pipe

39” x 39” 244” x 197”



Construction Examples

Round Pipe


Before Construction

After Construction

Box Culvert


Before Construction

After Construction


Before Construction

After Construction

Secondary Lining

φ 94"

Before Construction

AFter Construction

Certified by  Public Interest Incorporated Foundation Japan Sewerage New Technology Organization


            Construction Technology Examination Certificate


Certified by Public Interest Incorporated Association Japan Sewerage Association Class II Registered Materials

The pipe rehabilitation material for the 3S Segment Construction Method is a Class II Certified Material of the Japan Sewerage Association. The Ibaraki Kakioka Factory and Hiratsuka Factory are certified as equipment manufacturing factories.

Dated April 1, 2019