Strategien zur Zustandserfassung von Kanalisationen

Regarding a future expected inspection in the whole country in a range of about 30,000 km/a, it is required a suitable strategy which ensures the economic feasibility of such a commitment. Due to this municipality providers should generate solutions, bearing in mind if and under which conditions, single sewers should be investigated through predictive procedures, which nowadays are well-defined with constant fixed intervals. Nevertheless, it’s important as well to take into account a substantial improvement to sanitation needs, concerning a concrete implementation and the assigned boundary conditions from such strategy.This uncertain situation with respect to the implementation and use of different inspection strategies and its associated repercussions are the reason why this should be investigated, by clearing very punctual questions through a deep analysis and evaluation of such different strategies.This work includes an overview to the state of the art concerning optical sewer inspections. Several technical systems for optical condition gathering were analyzed from the literature regarding benefit-cost relationships. From there it is now possible to establish possible boundary conditions and their best operation scenarios.Together with the choice of suitable technical procedures as regards to inspection strategies, is to be clarified as well, when a sewer should be inspected within its normal life cycle. Such inspections can be developed through fixed intervals by means of conventional area-covering strategies, or by means of forecasting strategies. Last ones stand out, since the inspection of a sewer will depend on expected conditions, which could be estimated with statistical methods. Hereby, a mathematical foundation towards the concrete implementation of such personalized strategies will be attained.Afterwards, an evaluation is to be performed, taking into account the structural conditions from sewers, the associated error by the estimation from such conditions, the hold-up time from single sewers particularly during critical conditions and the yearly-based inspection rate. For this particular purpose a numerical method was developed and applied, which allows to simulate the development of sewer conditions under the influence of inspection strategies very close to reality.Every single strategy will be analyzed separately, in order to be able to judge the effects from several case scenarios and their implementations with respect to success potentials. Furthermore, a comparison of such strategies under the logistic and economical aspects is as well to be considered.Due to the huge observation periods in decades, a calibration between the real model and the applied numerical method is not possible. But from the significant effects of the different strategies concerning the formulated target, and since such a model tends to overvalue the potentials of success within conventional area-covering inspection strategies, it is possible for personalized strategies, to state recommendations regarding reasonable implementations with an adequate accuracy.Recapitulating, it will be proved with this work, that there are efficient alternatives from area-covered or partially first inspected sewers if applicable, as far as the expected reiterative area-covering inspections are based on fixed intervals. With such personalized strategies conditions from sewers can be gathered at an inexpensive and quite accurate way. Moreover, such personalized strategies contribute in a better way to the positive development of sewer conditions than conventional inspection strategies. There are many advantages from such strategies even for small sewage systems in municipalities with 10,000 up to 20,000 inhabitants. Such advantages tend to increase with bigger sewages. Additionally, it is also possible based on the conclusions of this paper and under the considerations of local conditions, depending on the committed target, to state recommendations for a particular inspection strategy and to estimate the potential savings compared to the contemplated strategy costs.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2005

Author dc:creator

• Müller, Karsten Paul

Contributors dc:contributor

• Dohmann, Max

• info:eu-repo/classification/ddc/620
• Ingenieurwissenschaften
• Inspektion
• Strategie
• Eigenkontrollverordnung
• Selbstüberwachungsverordnung
• Entwässerungssystem
• Instandhaltung
• Kanalisation

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121735%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:60002