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Old sewer - Putting out of operation (securing of drainage capability)
- Cleaning
- Optical inspection
- Removal of roots, deposits and other drainage obstacles
- Probable sealing of groundwater infiltrations
- Measurement and calibration of the section that is to be rehabilitated
- Probable creation of an excavation for installation (dependent on nominal size)
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(Image: Cleaning)
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(Image: Inspection)
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(Image: Damages)
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Before inserting the liner, a thin PE foil hose, also called Preliner hose or Preliner is installed in most European countries as a basic measure .
(Image: Installation of the Preliner)
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(Video: Insituform process: Inversion of the preliner [FI-Insit])
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The object of this is to prevent, among others the - Ingress of un-hardened resins in soil and groundwater;
- Uncontrolled ingress of so-called "excess" resin into connection regions where it could lead …
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| Eversion (Inversion) (Image: Insertion of the liner hose by means as an example with the Insituform process)
Everted-in-place insertion:
Method whereby the impregnated liner is introduced by eversion to achieve simultaneous insertion and inflation [DINEN13566-4:2003]. | | Pulling-in process (Image: KM-Inliner process with reference to [FI-KMG] - Sketch of principle of pulling-in the liner [Image: S&P GmbH])
Winched-in-place insertion:
Method whereby the … |
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| EN 13566-1 / DWA-M 143-3 Curing:
Process of resin polymerisation, which may be initiated or accelerated by the use of heat or exposure to light [DINEN13566-4:2003]. | | (Image: Controlling and documenting the supply and return temperatures)
| (Image: Light source)
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Polymerization: Mounting of molecules by chemical bonds into a new substance. |
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The hardening of the soaked hose can be carried out depending on the cured-in-place liner system: - in environmental temperature (cold hardening),
- by adding heat (thermal hardening) or
- by UV-light (light hardening).
(Image: KM-Inliner process with reference to [FI-KMG] - Thermical hardening)
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(Image: Inpipe process with reference to [FI-Teerb] - Light hardening with UV heating lamps [Image: S&P GmbH])
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(Image: Sequence diagram in the renovation of sewers by means of site manufactured and hardened linings - cured-in-place process - finishing work)
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(Image: Connecting the liner into the entry manhole with reference to [FI-Insit] - View of the manhole connection [Image: S&P GmbH])
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(Image: Lateral connection by means of a top hat sleeve)
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- Manhole connections
- Fitting of the cured-in-place liner to the manhole channel
- Reconstruction of the inclusion of the laterals
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Open cut method: The integration of laterals to the cured-in-place lined sewer is carried out via small excavations. For that purpose the integration points in the sewer have to be measured accurately in advance. (Image: Sewer opening by means of core drilling in the open cut method)
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Trenchless method The connection region is relatively easy to recognise from inside. In this region the liner bulges outwards somewhat so that boring, cutting and milling … |
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(Image: Recreation of the branch connection [FI-Insit] - Packer and top hat sleeve)
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(Image: Recreation of the branch connection [FI-Insit] - Packer with inverted top hat sleeve before installation)
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(Image: Recreation of the branch connection - Description of the process with reference to [FI-Insit] [Image: S&P GmbH])
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(Image: Recreation of the branch connection - Description of the process with reference to [FI-Insit] [Image: S&P GmbH])
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- Check and documentation of the cleaning, inspection, measurement and calibration of the sewer section that is to be rehabilitated.
- Reception control of the hose.
- Protocol of the transportation- and storage temperature (dependent on procedure).
- Recording of the tensile force during the pulling-in of the preliner- and liner hose.
- The hardening procedure is to be observed from a metrological point of view and is to be documented in a protocol.
- Taking …
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- Construction site personnel 3-5 people
- Cooling box or light-proof box or soaking facility depending on the type of liner
- Heating aggregate, steam generator or light source
- Pulling-in- or eversion system (frame or drum)
- possibly lifting device
(Image: Equipment for lining with cured-in-place pipes) |
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(Image: Pros and cons) | - Short period of construction
- Installation above the manhole construction
- Independency from material and shape of the cross section
- Applicable in non-accessible and accessible area
- Adjustable to different chemical demands
- Bends and angular deflections can be rehabilitated
- Inclusion of side inlets possible in the trenchless method of construction
- Small reduction of the cross section
- No pipe joints
- Improvement of the structural …
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(Image: Pros and cons) | - It is necessary to take the sewer out of operation
- Development of folds in the case of severe alterations of dimension and angular deflections
- Inner outline of the cured-in-place liner is determined by the surface structure of the old pipe
- Ovalties of the old pipe reduce the structural load bearing capacity
- Unprofessional soaking can lead to leaks
- Handling of liquid resin on the construction site
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(Image: Pulling-in the stud hose)
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In the grouted-in-place lining process, one or several HD-PE-hoses prefabricated with regard to their length and cross section are pulled into the sewer section to be rehabilitated by means of a cable winch and pressed against the inner wall under pressure. | (Image: Attention!)
Purpose of studs: Spacers to keep the distance from the pipeline to be rehabilitated or from the pre-installed HD-PE-hose. |
(Image: Working steps in the grouted-in-place lining … |
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(Image: Grouted-in-place process - System variation of the TROLINING® process - Basic system with reference to [FI-Troli] [Image: S&P GmbH])
| (Image: Grouted-in-place process - System variation of the TROLINING® process - Preliner system with reference to [FI-Troli] [Image: S&P GmbH])
| (Image: Grouted-in-place process - System variation of the TROLINING® process - Controll system with reference to [FI-Troli] [Image: S&P GmbH])
| (Image: Grouted-in-… |
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(Image: Sequence of the renovation of sewers by means of lining with site manufactured and hardened pipes - Grouted-in-place lining process)
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This lecture is part of the series "Trenchless 101" and serves to provide an overview of trenchless renovation methods for gas, water and wastewater pipelines.
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