Designing Liners for fully deteriorated sewers

  • In the German design code ATV-M 127-2, three host pipe states are differentiated: State I for leaky sewers without cracks, state II for sewers with longitudinal cracks but a stable soil pipe system, and state III for cracked pipes with larger deformations and considerable risk of collapse in the near future. State II sewers that are close to the traffic surface must be calculated as a state III situation. On the other hand, the US Standard ASTM F 1216 defines two states: structurally safe and fully deteriorated sewers. This paper examines the common aspects and differences between the two codes. A simple non-linear numerical approach is presented to evaluate the actual safety of the host pipe-soil system based on the following parameters: 1. the pipe material (e. g. age, corrosion depth, state of the contact zones), 2. the measured or estimated pipe deformations, 3. the soil group, stiffness, and possible voids occurring next to the springlines of the pipe, 4. the loading to be applied on the deteriorated pipe-soil system. Using stability and ultimate stress criteria, the safety of the system can be defined in a rational way. Missing parameters have to be introduced into the algorithm conservatively. Case studies are presented to demonstrate safe estimations for the host pipe state. The consequences on the required wall thickness of a lining and the application of non-circular linings are shown. The wall thicknesses resulting from a design for the fully deteriorated state as defined by the design codes in both the USA and Germany are compared and discussed.
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https://doi.org/10.25974/fhms-75

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Author:Bernhard Falter, Sonja Hildebrand, Martin Wolters
URN:urn:nbn:de:hbz:836-opus-2372
DOI:https://doi.org/10.25974/fhms-75
Parent Title (German):The North American Society (NASTT) and the International Society for Trenchless Technology (ISTT): International No-Dig Show 2009, Paper D-3-01
Publisher:The North American Society (NASTT) and the International Society for Trenchless Technology (ISTT)
Document Type:Conference Proceeding
Language:German
Date of Publication (online):2009/04/16
Year of first Publication:2009
Provider of the Publication Server:FH Münster - University of Applied Sciences
Release Date:2009/04/16
Tag:Druckzonen; Kanal; Liner; Verkehrslast
fully deteriorated gravity pipe; liner; pressure zones; sewer; traffic load
Faculties:Bauingenieurwesen (BAU)
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Licence (German):License LogoZweitveroeffentlichung