Performance of Buried Large Diameter Structured Wall PE Pipes [PE]
Andtbacka, Bjorklund, Lofmark, Thorstensson
# 2004 Milan
The performance of buried large diameter structured wall PE pipes has been studied by
following the development of the deflection in four different large diameter PE pipes installed
in Finland and Sweden. The pipes studied have had an internal diameter of 2000-2400 mm
and a ring stiffness of 4-8 kN/m2. Two of the above pipes are road culverts and one a culvert
under a railway, all installed in Sweden. The fourth pipe is installed for testing purposes in
Finland, exposed to heavy traffic with only 0.6 m of cover on top of the pipe. The ground
water table can be read from a stand pipe inside the pipe. The maximum vertical deflection
three years after installation has been found less than 4 % for all four installations. Only a
very limited increase in deflection has been noted over the years studied. The major part of
the deflection (70-90 %) has been achieved during installation and a few weeks thereafter, and
after two years the deflection has almost declined. The increase in deflection during the third
year after installation was insignificant (<0.2 %) for all pipe installations studied. A varying
deflection of up to 7 mm (0.3 %) has been measured at the test installation in Finland, mainly
due to temperature variation in the ground.
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In the late nineties a study of the behavior of buried thermoplastics pipes was carried
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Author(s) : Anders Andtbacka, Frans Alferink, Peter Sejersen
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