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Mar 20, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Deformation Process

In this group of processes, the respective plastic continuous pipes of PE or PVC specially modified for this process are predeformed into a U- or C-shape by supplying heat at the site or immediately before being pulled in so that, depending on the string diameter compared to the original cross section, a cross-sectional reduction of up to 40% [FI-Rehau] is achieved.

(Image: Deformation process – lining pipe pre-deformed) (Image: Deformation process - …

Mar 20, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Deformation Process

(Image: Limiting conditions)
(Table: Area of application for lining with continuous pipe without annular space - deformation process [FI-Steina])

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Deformation Process

HD-PE-pipes have a specific internal structure due to their chemical and physical composition.

Stresses are deliberately integrated into the pipe by predeforming it, and thus a new structure is created.

The quick cooling of the deformed pipe serves to freeze this new structure.

 (Image: Structural change during deformation)

By re-heating the predeformed pipe, it changes back to a preferably stress-free state, namely the round shape before the folding …

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Deformation Process

Factory-predeformed lining pipes are delivered to the construction site on pipe drums.

The continuous pipe is directly pulled in by the drum or by the coiled bundle (only with shorter rehabilitation sections).

(Image: Pulling-in excavation for deformation processes [DVGWGW320-2])

Should a pulling-in excavation be necessary during the deformation process, the dimensions depend on the minimum bending radii of the predeformed pipes.

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Deformation Process

(Image: Subline process [FI-Subte] - Predeformed continuous pipe)

In the Subline process developed in Great Britain, the deformation of the continuous pipe is integrated into the insertion process, i.e. it is carried out in-situ with the aid of a hydraulically acting deforming and insertion device. When leaving the device, the temporary C-form of the PE continuous pipe is held by manually applied, thin, PP straps so that a cross sectional reduction …

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Deformation Process

After the pulling-in of the predeformed lining pipes, the pipe ends are sealed and the pipes are set up

  • by superheated steam and/or
  • internal pressure
  • by using a calibre tool, if necessary.
(Image: Compact pipe process with reference to [FI-Wavin] - Depiction of principle of the steam and pressure introduction to the liner [Image: S&P GmbH]) (Image: NuPipe process [FI-NUPip] - Reverting the liner with the aid of an expander body driven by steam, …

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Deformation Process

Working steps for redeformation by means of superheated steam under internal pressure:

  • Heating of the predeformed lining pipe up to the temperature that is required for the material while the internal pressure is slightly increased.
  • Increase of the internal pressure while the temperature is slowly reduced.
  • Maintenance of the maximum internal pressure until the lining pipe is sufficiently recooled.
(Image: Deformation process - Steam generator and …

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Deformation Process

(Image: Compact pipe process [FI-Wavin] - Welding on the pull head) (Image: Compact pipe process [FI-Wavin] - Pipe drum positioned at the starting manhole)
(Image: Compact pipe process [FI-Wavin] - Pulling-in the continuous pipe into the manhole) (Image: Compact pipe process [FI-Wavin] - Closing the continuous pipe for the introduction of steam)

Mar 20, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Reduction Process

In contrast to the deformation process, the outside diameter of the HD-PE plastics continuous pipe is thermally and/or mechanically reduced by about 10% immediately before the insertion process while the circular cross section is maintained, and it is expanded again until it clings to the inner wall of the sewer by using the material's own "memory effect".

Swage-Lining
Thermo-mechanical deformation of continuous pipe

(Image: Reduction process with …

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Reduction Process

(Image: Limiting conditions)
(Table: Area of application for lining with continuous pipe without annular space - Reduction process [FI-Steina])

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Reduction Process

(Image: Attention!)

In order to guarantee a smooth and continuous reduction, the external welding beads must be removed within the range of the welded joints.

(Image: Welding bead)

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Reduction Process

In the reduction process, the length of the excavation depends on the bending radii of PE-pipes recommended by the pipe manufacturers.

In this connection, the temperature-dependent change of the permissible bending radii must be considered (cp. lining with continuous pipes with annular space).

(Formula: Calculation of the length of the pulling-in excavation for reduction process [DVGWGW320-2])
(Image: Pulling-in excavation for reduction process […

Mar 20, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Sewage-Lining

The temporary diameter reduction is thermally and mechanically carried out in a die. This basically consists of a firing chamber, a heating section and a die plate.

 (Image: Reduction process with thermal-mechanical diameter reduction (Swagelining) with reference to [FI-Teerb] - View on the starting excavation [Image: S&P GmbH])
(Image: Reduction process with thermal-mechanical diameter reduction (Swagelining) with reference to [FI-Teerb] - View …

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Sewage-Lining

(Image: Reduction process with thermal-mechanical diameter reduction (Swagelining) [FI-Teerb] - View on the starting excavation - Pulling in the swaged pipe)
(Image: Reduction process with thermal-mechanical diameter reduction (Swagelining) [FI-Teerb] - View on the starting excavation - Pulling in the swaged pipe)
(Image: Reduction process with thermal-mechanical diameter reduction (Swagelining) [FI-Teerb] - Predeformed pipe)

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Sewage-Lining

Within 20 to 24 hours after the ending of the insertion and release of the tensile force, the continuous pipe reverts back to its original size because of the stress condition caused by heat deformation, and presses itself, without any helping measures, tightly against the inner wall of the sewer to be rehabilitated .

(Image: Attention!)

Finishing work, such as the restoration of connections, can only be carried out 20 to 24 hours after completing …

Mar 20, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Rolldown Process

(Image: Reduction process with mechanical diameter reduction (Rolldown process) with reference to [FI-Klug] - Sketch of the principle [Image: S&P GmbH])

In the rolldown process, the temporary diameter reduction of the prefabricated continuous pipe is achieved mechanically with the aid of a hydraulically driven gripper mechanism and two - or for larger nominal sizes three - hemispherical roller pairs set at 90° to each other .

(Image: Deformation …

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Rolldown Process

(Image: Reduction process with mechanical diameter reduction (Rolldown process) [FI-Klug] - Mechanical reduction of the continuous pipe diameter by means of semicircular shaped roller pairs) (Image: Reduction process with mechanical diameter reduction (Rolldown process) [FI-Klug] - Mechanical reduction of the continuous pipe diameter by means of semicircular shaped roller pairs)

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Rolldown Process

(Image: Attention!)

As a result of the reduction in diameter, there is a lengthening of the continuous pipe by approx. 4% and an increase of the wall thickness of the pipe by approx. 6%. The former is to be taken into account in the shortening of the continuous pipe when it again enlarges [Köstr88].

For the reversion, i.e., the enlarging of the lining pipe to its original size, locking pieces, e.g. welding necks made of HD-PE with loose flangers, …

Mar 20, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Comparison of Methods

(Table: Comparison of method variants of lining with continuous pipes without annular space [FI-Steina])

Mar 20, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Mar 21, 2006

Modules

Renovation: Lining with Continuous Pipes - Part IV - Method Variants without Annular Space

Finishing Works

(Image: Sealing of the annular space using a link chain - Installation)
(Image: Lining with contiuous pipe - Rohrstrangverfahren - Adapting the liner to the manhole channels)
(Image: Connecting a lateral to the liner by means of a welded-in plastics pipe and shrink socket with reference to [WRC83] [Image: S&P GmbH])

The finishing work comprises in addition to testing :

  • Manhole connection;
  • Adapting the liner to the manhole channels;
  • Restoring …

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