All Show and All Substance in Tilburg, NL
May 25, 2009
Efficient Relining with HOBAS NC Line® Wins No Dig Award: The sewer in Sint Josephstraat, The Netherlands, is part of the Tilburg main sewer and is an important link in the system of the waste water treatment plant and the rainwater overflow at the Wilhelmina Channel. Designed in 1927 and installed one year later, it consists of a concrete base with a masonry arch. Its transversal section is that of a reversed egg profile, with 1.90 m maximal width and 2.15 m height.
To find the cause for the cracks in the sewer, drill samples were taken from the line. Each sample was strength tested. The masonry proved to be of excellent quality: strength > 60 N/m2. The quality of the concrete base, however, did not exceed class B10 and calculations proved that the cracks evolved due to an overload on the structure.
The gravity and scope of damage had to be evaluated in order to determine which measures were to be taken and what should be prioritized. Sewer renovations ask for tailormade solutions where local circumstances play an important role. Since repairs did not solve the problem, relining or the replacement of the sewer had to be taken into consideration. The latter option would have called for the destruction of the complete existing line in open trench whereas with relining the old structure would remain. The idea of replacing the sewer was soon set aside for it posed technical as well as implementation problems. Moreover it would have been the most costly method.
The number of suppliers for non circular pipe segments that are manufactured in advance is limited. Tilburg soon selected sliplining and HOBAS NC Line Systems. Most important criteria were the guaranteed product quality, provided technical know-how for the implementation, tested and certified homogeneous pipe material and high strength with a relatively small reduction in flow volume.
Preparing the implementation, the contractor had to prove that the design meets all specified requirements. The pipe strength was classified with an FEM (finite elements method) calculation which is based on the German directive ATVDVWK- A-127 and particularly ATV-M-127-2.
Year of Construction: 2008
Duration: 5 month
Total Length of Pipe: 860 m
Pressure Class: PN 1
Diameter: 2150/1900 mm
Installation method: open trench
Application: SewerLine®, NC Line®
Client: Community Tilburg
Contractor: Heijmans Infra techniek BV
Advantages: made to measure profiles, complete leak tight system, high quality, small loss in relining diameter
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Contact
HOBAS Engineering GmbH
9020 Klagenfurt, Österreich
Phone:
+43.463.482424
Fax:
+43.463.482121