Source:JASE-W Japanese Smart Energy Products & Technologies

https://www.jase-w.eccj.or.jp/technologies/index.html

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Keywords

Y3

equipment or facility

Z5water

E18

plastic products

Sekisui Chemical Co., Ltd.

SPR Method (a Trenchless Sewage Pipeline Renewal Method)
Features
SPR method rehabilitates an old sewage pipeline into a strong and solid composite pipeline composed of theexisting pipe, a rehabilitation pipe and backfill material. The rehabilitation pipe is constructed by winding rigid
polyvinyl chloride (PVC) profile inside the existing pipe and the backfill material is applied in the space
between the existing and rehabilitation pipes.
The main characteristics of the method are as follows:
1) Executable without excavating roads: SPR is a trenchless method executed without road excavation, as
all the materials and equipment required are transported from manholes to the inside of pipeline. As it istrenchless method, waste such as earth and sand is not generated at all.
2) Excellent water-tightness: The rehabilitation pipe has excellent water-tightness against internal andexternal water pressure because it is manufactured with the fusion of poly-ethylene resin (PE method) orinterlocking of polyvinyl chloride (PVC) profile mixed with water proof seal (IL method).
3) Excellent corrosion resistance - no fear of corrosion: As the material of the surface of profile is either poly ethylene(PE) or PVC, the profile has excellent corrosion-resistance and it will not be corroded by hydrogen sulfide.
4) Discharge capacity after the rehabilitation equivalent to or better than the capacity before therehabilitation: Because the coefficient of roughness of either material of the rehabilitation pipe is excellent(0.01), the rehabilitation pipe should have the flow rate equivalent to or larger than the rate in the existing
pipe despite the fact that the diameter of the former is smaller than that of the latter.
5) Winding machine transportable through a small-diameter working hole: Since the winding machine canbe disassembled for transportation, it can be transported into a sewage system from a manhole
regardless of its shape so long as it has a diameter of approx. 600 mm.
6) Executable without interrupting the service: Rehabilitation can be executed while sewage is flowing in a sewer pipe.
7) Little influence on social activities: As this method requires no excavation at all, it has little impact onsocial activities such as traffic and it requires no measures against odor or noise. Therefore, it is easy toobtain approval of the people for the implementation of the work.

Basic Concept or Summary
A new pipeline will be constructed by manufacturing a pipe by interlocking and fusing rigid PVC or PE material andfilling the space between the new and existing pipes with such material as mortar inside the existing pipeline. It ispossible to execute this work with sewage flowing in the existing pipeline if its flow rate is small. While slightdeviation of joint on an existing pipe can be accommodated by making the diameter of a rehabilitation pipe
smaller, unevenness or meandering of an existing pipe will be recreated when a new pipe is installed, in principle.
<Implementation procedure>(1) Preliminary survey
To survey inside a sewer pipeline to decide whether SPR method can be applied to the pipeline or not(2) Decision on the diameter of a rehabilitation pipe
On the basis of the result of the preliminary survey, the diameter of a rehabilitation pipe shall be determined. Inprinciple, a diameter which shall make the flow rate in the new pipeline equivalent to that in the existing one shall be
the standard for the diameter of a new pipeline. The actual diameter of a new pipeline can be determined inaccordance with the actual conditions, including unevenness, meandering and step-like gaps, of an existing pipeline.
(3) Piping
Two types of piping systems, the externally driven system and the self-propelling system, are used for the piping.
Profile drum

Externally driven system

Power unit
Winding machine forpipeline rehabilitation
Existing pipe

Drum feeding profile
from its inside(applicable to an existing pipeline witha diameter between 250 mm and 1,500 mm)

Rehabilitation pipe

Self-propelling system(applicable to an existing pipeline witha diameter between 900 mm and 5,000 mm)
Generator
truck

Rehabilitation Self-propellingpipe
winding machine Hydraulic unit(4) For a rehabilitation pipe with a diameter of less than 800 mm, metal chain shall be installed inside the pipe andit shall be filled with sewage or water supplied from a water truck to prevent it from floating when backfilling material is applied. For a rehabilitation of a larger pipe, supports shall be installed inside the pipe to prevent floating anddeformation of the pipe when backfilling material is applied.
(5) Application of backfill material: Backfill mortar specifically developed for this method shall be applied.
Outlets of collecting sewers shall be installed before the application.
Backfilling mortar
application device

Existing pipe
Backfilling mortar
Rehabilitation pipe
Rehabilitation pipe
Backfilling mortar Existing pipe

Stop valve
with syphon

Air compressor

Air vent(6) Drilling of collecting sewer outlets: Collection sewer outlets shall be drilled
to connect collecting sewers to an existing collection sewer.
1. Device for drilling from a collecting sewer
The outlet shall be created by inserting a driller in an existing collecting
sewer from a pit, expanding the drill bits with air and rotating the bits.
2. Device for finishing from inside an existing pipeline
If an outlet on an existing pipeline is uneven, the outlet shall be finishedfrom inside the pipeline.
(7) Finishing of the ends of a main and inverts: The work shall be completedwith the finishing of the ends of a main and inverts.

Operating unit
Flexible shaft
Collection sewer
Driller

Effects or Remar ks
No waste generation: Generation of industrial waste can be minimized as a new pipeline is created by rehabilitating an existing one.
The execution without excavation reduces CO2 emission.
Installation in Practice or Schedule
Domestic

Total
lengthOverseas

Contact:

Sekisui Chemical has rehabilitated more than 800 km of sewage pipeline with its original
trenchless sewage pipeline rehabilitation method in 42 countries in the world including:1) Asia and Oceania: Japan, Australia, Singapore, South Korea, Hong Kong, Taiwan, Malaysia, etc.
2) North America: USA, Canada
3) Europe: Germany, France, UK, the Netherlands, Russia, Spain, etc.

Sekisui Chemical Co., Ltd.
Overseas Pipeline Renewal Division, Urban Infrastructure & Environmental Products Company
Tel:+81-3-5521-0574 Fax:+81-3-5521-0557
http://www.sekisui.com/ e-mail: nakai013@seksiui.com

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