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Laboratory tests and analysis of CIPP epoxy-resin internal liners used in pipelines – part I: comparison of tests and engineering calculations

Abel Tomasz

Studia Geotechnica et Mechanica

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2021

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Vol. 43, nr 2

169--180

EN

Tests that were carried out in order to obtain knowledge of the actual values of strength parameters obtained by CIPP liners that are used to repair pipelines. Specimens of liners made of high quality polyester felt cured with epoxy resin were subjected to tests. The scope of the performed studies corresponded with the scope of acceptance tests, which are carried out in the investment process during quality control of renovation works. Specimens of liners taken from sewers with 3 different diameters, i.e. 200mm, 350mm and 500mm were selected as representative for underground sewage networks. The obtained results enabled the calculations carried out in the course of design work to be verified, and differences between the model values of the strength parameters obtained from the calculations, and real values that are burdened with irregularities resulting from the conditions prevailing at a construction site and which were obtained for specimens taken from their built-in locations to be compared. The tests confirmed that it is possible to renovate - using CIPP liners - sewers with a lot of structural and material damage that negatively affects a liner‘s geometry. The implementation of the reinforcing internal coating in a sewer enables its further safe operation. The direct application value of the research involves the enlargement and clarification of knowledge concerning the actual load-bearing capacity of CIPP liners.

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Laboratory tests and analysis of CIPP epoxy resin internal liners used in pipelines – part II: comparative analysis with the use of the FEM and engineering algorithms

Abel Tomasz

Studia Geotechnica et Mechanica

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2021

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Vol. 43, nr 3

307--322

EN

In the case of underground network infrastructure it can be seen that objects functioning in the second technical condition, according to DWA-ATV 143-2, and subjected to rehabilitation with the use of close-fit trenchless technologies are capable of withstanding external loads. The main external load that is taken into account in engineering calculations in the case of conduits in the second technical condition is external groundwater pressure. In order to compare design parameters obtained with the use of various calculation methods, a comparative analysis was conducted in order to determine the values of critical pressure. The calculations were carried out using popular engineering algorithms. In addition, analyses using the Finite Element Method and Abaqus software as a computational tool were carried out for the purpose of verifying laboratory tests. This paper aims to broaden knowledge concerning the possibility of performing control numerical analyses for close-fit liners installed in pipelines that are in the second technical condition according to DWA-ATV 143-2. The analyses were carried out on ten 3D models. The models were parameterized in order to reflect the CIPP samples in the most accurate way. The computational models were built based on assumptions, which are commonly used in this type of scientific analysis, regarding material parameters and their interactions. The direct value of the performed engineering calculations and numerical analyses is the extension of knowledge in the field of strength parameters that are obtained by various material groups of close-fit liners. Comparative analysis of the results of laboratory tests and numerical analyses, and the conclusions that result from them, constitute the basis for the optimization of the design process and the individual approach to issues related to the use of liners that strengthen underground pipelines.

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NO-DIG Award 2003: trenchless sewer rehabilitation in Marianskie Lazne Spa

Karous M. R., Lovecky S., Pecek J., Bezrouk J.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Budownictwo

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2005

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Z. 44

179-182

EN

In the paper the trenchless sewer rehabilitation in Marianskie Lazne Spa has been presented. The total length of the reconstructed sewer pipelines represents 11,4 kilometres, trenchless techniques participated in total of 67% of whole length.

PL

W artykule przedstawiono, nagrodzony nagrodą NO-DIG, projekt renowacji kanałów w Mariańskich Łaźniach. Projekt ten obejmował renowację przewodów kanalizacyjnych o łącznej długości 11,4 km, przy czym 67% długości odnawianych przewodów wykonano technikami bezwykopowymi.

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Simulating structural and hydraulic decline of sewer networks

Baur R., Schulz N., Hoeft S.

Prace Naukowe Instytutu Inżynierii Lądowej Politechniki Wrocławskiej. Konferencje

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2005

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Vol. 53, nr 20

30-39

EN

The structural condition of sewer pipelines is well documented by CCTV inspection. Recent research projects funded within the EU 5th framework programme, (e.g. the project CARE-S) aim at the interpretation of structural and hydraulic decline of urban drainage systems in order to better understand consequences of deteriorated systems and to forecast future rehabilitation needs. This case study combines structural deterioration and hydraulic simulation modelling for the development of a pro-active rehabilitation programme. Structural ageing of the sewer pipe network is simulated by a network deterioration model, whereas for the hydraulic simulation of the defect system, a model based on structural decline of single pipes is used. In addition, the effects of a reduction of infiltration into the network are calculated for a simplified network by an integrated model.

PL

Stan techniczny przewodów kanalizacyjnych jest dobrze udokumentowany wynikami inspekcji CCTV. Ostatnie badania wspomagane przez Piąty Program Ramowy (np. projekt CARE-S) mają na celu interpretację pogarszania się parametrów konstrukcyjnych i hydraulicznych miejskich sieci w celu lepszego zrozumienia konsekwencji starzenia się systemów i możliwości przewidzenia przyszłych potrzeb renowacyjnych. Prezentowany przykład praktyczny łączy modelowanie starzenia się konstrukcyjnego i hydraulicznego i ma na celu wypracowanie proaktywnego programu rehabilitacji. Strukturalne starzenie się przewodów sieci kanalizacyjnej symulowane były przy użyciu globalnego sieciowego modelu starzenia, podczas gdy pogarszanie się parametrów hydraulicznych symulowane było przez system defektów dla pojedynczych przewodów. Ponadto wzięto pod uwagę efekt redukcji infiltracji dla uproszczonej sieci Przy pomocy zintegrowanego modelu.

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Deterioration models for sewer networks

Schmidt T.

Prace Naukowe Instytutu Inżynierii Lądowej Politechniki Wrocławskiej. Konferencje

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2005

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Vol. 53, nr 20

363-373

EN

Sewers deteriorate sooner or later. Two types of models have been developed recently for modelling this deterioration process, using CCTV-inspection results. They are based on methods of survival analysis and Markov processes. These approaches are introduced and described. Examples illustrate the calibration of theses models and interpretation of their results. Potential problems of the two approaches are shown and discussed. The paper concludes with an introduction of further applications of the resulting deterioration model for individual sewer networks.

PL

Kanały sanitarne w trakcie eksploatacji ulegają nieuchronnemu procesowi pogarszania się ich stanu technicznego. W ostatnim czasie opracowano dwa modele opisujące proces pogarszania się stanu technicznego kanałów, bazujące na rezultatach inspekcji telewizyjnych. Podstawą tych modeli są metody matematyczne analizy niezawodności oraz procesu Markowa. Ujęcia rozpatrywanego zagadnienia zostały wprowadzone i opisane. Przykłady zawarte w pracy ilustrują kalibrację modeli oraz interpretację wyników. Wskazane zostały problemy związane z aplikacją prezentowanych modeli starzenia kanałów. W podsumowaniu pracy zaprezentowano możliwości zastosowania opisywanych modeli starzenia do określania przyszłego stanu technicznego konkretnych kanałów.