DIN EN 13566

Lining with continuous pipes

Lining with continuous pipes:
Lining with pipe made continuous for the length of the section to be renovated prior to insertion, and which has not been shaped to give it a cross-sectional diameter smaller than its final diameter after installation [DINEN13566-1:2003].

Conventional sliplining process

Corrugated pipe process

The lining with continuous pipes with annular space requires the following equipment:

• Staff of 4-6 persons on construction site
• Possibly devices and machines for installing and securing the excavation (e.g. excavator, supporting elements)
• Heating element butt welding equipment and power set
• Winch with corresponding tensile strength
• Pulling head
• Roller blocks
• Lifting device
• Compulsory …

Old sewer

• Taking 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 process variant and nominal size)

To secure the drainage capability within the scope of the employment of cured-in-place lining processes, the following possibilities are at hand:

• Interruption of the drainage capability by limiting backwater in the sewer above the section that is to be rehabilitated
• Maintaining the drainage capability by measures external of the sewer that is to rehabilitated

The following aspects are to be considered during inspection:

• Deviations in the inner diameter
• Direction changes
• Displaced joint
• Laterals
• Ground water infiltrations
• Flow obstacles
• Deformations
• Cracks, fragments, break

Obstacle elimination

Pipe reductions, expansions or slight direction changes are obstacles that do not necessarily impede the installation of a lining pipe or put the operating safety at risk. The contracting parties have to agree on whether a correction is needed or not [RSV3].

Calibration

For the correct use of lining processes, it is necessary to obtain …

The length of the pulling-in excavation is determined by the permissible pipe bending radii.

If a plastic pipe is bent, the outer fibres of the outside pipe are strained. When the pipe is pulled-in, it is additionally strained by the tensile strength.

The DVS-guideline 2205-1 provides deformation limits for different plastics that apply for an unoriented condition that is free of residual stress.

The complete extension of outer fibres (pulling in plus bending) should not exceed 3.0% with HD-PE-pipes.

Taking into account possible operational axial extensions as a result of internal pressure for non-grouted pressure pipes or bending extensions for curved pipes, the extension ε_tension during the pulling-in should not exceed a limit of 2.0%.

If an extension of 2 % is permitted during pulling-in, then the permissible extension caused by bending in the region of the curve is still approx. 1 to 2 %.