Plastic liners are optimum additionfor concrete jacking pipes

Interior polythene (PE) liners have been used successfully for many years in concrete water and sewage pipes with diameters from 200 mm to several meters. The liners are attached to the concrete using anchors and/or studs creating a composite material which ideally combines the benefits of concrete with those of PE. While the rigidity of the concrete absorbs mechanical stresses the PE liner acts as corrosion proofing and a permanent seal. The PE interior liner also exhibits an excellent friction coefficient and minimal flow resistance. Ultimately the thermoplastic inner layer optimises and guarantees the long service life of the pipework (>100 years). The benefits of the PE interior liner have been unarguably demonstrated using systematic analyses and comparisons with other lining systems. In corrosion tests PE has been found to be the best solution even with aggressive sewage, providing long term protection for concrete unmatched by other systems. Further mechanical experiments have shown that PE permanently seals the pipework system even if the concrete is already cracked. So-called bionic surface structures offer further benefits in preventing deposits on the base of the sewer. Concrete protection inliners can be fitted during the manufacture of concrete pipes. These can then be installed extremely economically using the trenchless pipe-jacking method. The PE inliners of the individual pipes can then be welded together to produce a watertight pipework system and long-term corrosion protection for the concrete pipes.

---