– 0 – – 0 –
MAINTENANCE AND MONITORING OF PROTECTION WORKS FOR TORRENT CONTROL IN AUSTRIA
Jürgen Suda1, Martin Jenni2, Florian Rudolf-Miklau3
A lot of protection works for torrent control were built in the Austrian Alps since the nineteenth century, to protect human settlements and infra-structure (streets, railway lines,…) against floods, debris flows and avalanches. The first buildings have been erected using materials like timber, boulders and building blocks. In the end of the sixties of the twentieth century concrete and reinforced concrete barriers replaced traditional construction techniques.
At the current state there are a lot of different types of protection works (e.g. barriers, dams, sills, ramps) in different condition levels in Austrian torrents. At this time the number of new construction decreases while the amount of maintenance and rebuilding measures increases.
For all these activities the limited public funds of the communities, federal states and the republic on the one hand and the statutory provisions on the other hand have to be considered.
A fundamental task is the periodic monitoring of existing measures concerning their condition and effectiveness. This task is mainly the duty of the protection works holder (communities, beneficiaries, water cooperatives,…), who are supported by the Austrian Torrent and Avalanche Control Service. Until now no standardised procedures for periodic monitoring, assessment and maintenance of torrential barriers are available in Austria. By using an area- wide monitoring concept with adjusted decision tools, the public funds could be used more efficiently and a long-term planning of maintenance measures would be possible (based on life-cycle costs). This was the reason for the development of an Austrian Standard Rule (ONR).
MONITORING CONCEPT
The monitoring concept, developed for the above mentioned Austrian standard, is divided in two parts, the inspection and the measurement or intervention part (Fig.1). The main target of the inspection part is to assess the condition in a comprehensive manner. This is guaranteed by the comparison of the actual state with a reference state. The aim of the inspection is to classify the structure in one of six condition levels. Level 1-buildings are new or as good as new, level 6 - building are completely destroyed. To identify the actual condition,
1 Research Scientist, Institute of Structural Engineering Department of Civil Engineering and Natural Hazards University of Natural Resources and Applied Life Sciences (BOKU), Austria; (juergen.suda@boku.ac.at / Phone: +43-1-47654-5256; Fax:-5299)
2 Torrent Control Engineering Expert, Austrian Service for Torrent and Avalanche Control, Departement for Vorarlberg, Austria (martin.jenni@die-wildbach.at; +43-1- 05552/62006)
3Torrent Control Engineering Expert, Federal Ministry for Agriculture, Forestry, Environment and Water Management, Department for Torrent and Avalanche Control, Vienna, Austria (florian.rudolf-
miklau@lebensministerium.at)
MAINTENANCE AND MONITORING OF PROTECTION WORKS FOR TORRENT CONTROL IN AUSTRIA
Jürgen Suda1, Martin Jenni2, Florian Rudolf-Miklau3
A lot of protection works for torrent control were built in the Austrian Alps since the nineteenth century, to protect human settlements and infra-structure (streets, railway lines,…) against floods, debris flows and avalanches. The first buildings have been erected using materials like timber, boulders and building blocks. In the end of the sixties of the twentieth century concrete and reinforced concrete barriers replaced traditional construction techniques.
At the current state there are a lot of different types of protection works (e.g. barriers, dams, sills, ramps) in different condition levels in Austrian torrents. At this time the number of new construction decreases while the amount of maintenance and rebuilding measures increases.
For all these activities the limited public funds of the communities, federal states and the republic on the one hand and the statutory provisions on the other hand have to be considered.
A fundamental task is the periodic monitoring of existing measures concerning their condition and effectiveness. This task is mainly the duty of the protection works holder (communities, beneficiaries, water cooperatives,…), who are supported by the Austrian Torrent and Avalanche Control Service. Until now no standardised procedures for periodic monitoring, assessment and maintenance of torrential barriers are available in Austria. By using an area- wide monitoring concept with adjusted decision tools, the public funds could be used more efficiently and a long-term planning of maintenance measures would be possible (based on life-cycle costs). This was the reason for the development of an Austrian Standard Rule (ONR).
MONITORING CONCEPT
The monitoring concept, developed for the above mentioned Austrian standard, is divided in two parts, the inspection and the measurement or intervention part (Fig.1). The main target of the inspection part is to assess the condition in a comprehensive manner. This is guaranteed by the comparison of the actual state with a reference state. The aim of the inspection is to classify the structure in one of six condition levels. Level 1-buildings are new or as good as new, level 6 - building are completely destroyed. To identify the actual condition,
1 Research Scientist, Institute of Structural Engineering Department of Civil Engineering and Natural Hazards University of Natural Resources and Applied Life Sciences (BOKU), Austria; (juergen.suda@boku.ac.at / Phone: +43-1-47654-5256; Fax:-5299)
2 Torrent Control Engineering Expert, Austrian Service for Torrent and Avalanche Control, Departement for Vorarlberg, Austria (martin.jenni@die-wildbach.at; +43-1- 05552/62006)
3Torrent Control Engineering Expert, Federal Ministry for Agriculture, Forestry, Environment and Water Management, Department for Torrent and Avalanche Control, Vienna, Austria (florian.rudolf-
miklau@lebensministerium.at)
MAINTENANCE AND MONITORING OF PROTECTION WORKS FOR TORRENT CONTROL IN AUSTRIA
Jürgen Suda1, Martin Jenni2, Florian Rudolf-Miklau3
A lot of protection works for torrent control were built in the Austrian Alps since the nineteenth century, to protect human settlements and infra-structure (streets, railway lines,…) against floods, debris flows and avalanches. The first buildings have been erected using materials like timber, boulders and building blocks. In the end of the sixties of the twentieth century concrete and reinforced concrete barriers replaced traditional construction techniques.
At the current state there are a lot of different types of protection works (e.g. barriers, dams, sills, ramps) in different condition levels in Austrian torrents. At this time the number of new construction decreases while the amount of maintenance and rebuilding measures increases.
For all these activities the limited public funds of the communities, federal states and the republic on the one hand and the statutory provisions on the other hand have to be considered.
A fundamental task is the periodic monitoring of existing measures concerning their condition and effectiveness. This task is mainly the duty of the protection works holder (communities, beneficiaries, water cooperatives,…), who are supported by the Austrian Torrent and Avalanche Control Service. Until now no standardised procedures for periodic monitoring, assessment and maintenance of torrential barriers are available in Austria. By using an area- wide monitoring concept with adjusted decision tools, the public funds could be used more efficiently and a long-term planning of maintenance measures would be possible (based on life-cycle costs). This was the reason for the development of an Austrian Standard Rule (ONR).
MONITORING CONCEPT
The monitoring concept, developed for the above mentioned Austrian standard, is divided in two parts, the inspection and the measurement or intervention part (Fig.1). The main target of the inspection part is to assess the condition in a comprehensive manner. This is guaranteed by the comparison of the actual state with a reference state. The aim of the inspection is to classify the structure in one of six condition levels. Level 1-buildings are new or as good as new, level 6 - building are completely destroyed. To identify the actual condition,
1 Research Scientist, Institute of Structural Engineering Department of Civil Engineering and Natural Hazards University of Natural Resources and Applied Life Sciences (BOKU), Austria; (juergen.suda@boku.ac.at / Phone: +43-1-47654-5256; Fax:-5299)
2 Torrent Control Engineering Expert, Austrian Service for Torrent and Avalanche Control, Departement for Vorarlberg, Austria (martin.jenni@die-wildbach.at; +43-1- 05552/62006)
3Torrent Control Engineering Expert, Federal Ministry for Agriculture, Forestry, Environment and Water Management, Department for Torrent and Avalanche Control, Vienna, Austria (florian.rudolf-
miklau@lebensministerium.at)
MAINTENANCE AND MONITORING OF PROTECTION WORKS FOR TORRENT CONTROL IN AUSTRIA
Jürgen Suda1, Martin Jenni2, Florian Rudolf-Miklau3
A lot of protection works for torrent control were built in the Austrian Alps since the nineteenth century, to protect human settlements and infra-structure (streets, railway lines,…) against floods, debris flows and avalanches. The first buildings have been erected using materials like timber, boulders and building blocks. In the end of the sixties of the twentieth century concrete and reinforced concrete barriers replaced traditional construction techniques.
At the current state there are a lot of different types of protection works (e.g. barriers, dams, sills, ramps) in different condition levels in Austrian torrents. At this time the number of new construction decreases while the amount of maintenance and rebuilding measures increases.
For all these activities the limited public funds of the communities, federal states and the republic on the one hand and the statutory provisions on the other hand have to be considered.
A fundamental task is the periodic monitoring of existing measures concerning their condition and effectiveness. This task is mainly the duty of the protection works holder (communities, beneficiaries, water cooperatives,…), who are supported by the Austrian Torrent and Avalanche Control Service. Until now no standardised procedures for periodic monitoring, assessment and maintenance of torrential barriers are available in Austria. By using an area- wide monitoring concept with adjusted decision tools, the public funds could be used more efficiently and a long-term planning of maintenance measures would be possible (based on life-cycle costs). This was the reason for the development of an Austrian Standard Rule (ONR).
MONITORING CONCEPT
The monitoring concept, developed for the above mentioned Austrian standard, is divided in two parts, the inspection and the measurement or intervention part (Fig.1). The main target of the inspection part is to assess the condition in a comprehensive manner. This is guaranteed by the comparison of the actual state with a reference state. The aim of the inspection is to classify the structure in one of six condition levels. Level 1-buildings are new or as good as new, level 6 - building are completely destroyed. To identify the actual condition,
1 Research Scientist, Institute of Structural Engineering Department of Civil Engineering and Natural Hazards University of Natural Resources and Applied Life Sciences (BOKU), Austria; (juergen.suda@boku.ac.at / Phone: +43-1-47654-5256; Fax:-5299)
2 Torrent Control Engineering Expert, Austrian Service for Torrent and Avalanche Control, Departement for Vorarlberg, Austria (martin.jenni@die-wildbach.at; +43-1- 05552/62006)
3Torrent Control Engineering Expert, Federal Ministry for Agriculture, Forestry, Environment and Water Management, Department for Torrent and Avalanche Control, Vienna, Austria (florian.rudolf-
miklau@lebensministerium.at)
– 0 – – 0 –
MONITORING of Torrential Barriers
measurement - attendance
- corrective maintenance MAINTENANCE condition assessment
CONDITION ASSESSMENT - condition levels
CONDITION FORECAST -model simulations
INSPEKTION
measurement - rebuilding of components - rebuilding of structure
REBUILDING
measurement - enlargement - modification - adaption
CHANGING
MEASUREMENT
IDENTIFICATION
CONDITION ASSESSMENT DATACOLLECTION - Level 1 Inspection - Level 2 Inspection - Level 3 Inspection DOCUMENTATION - control minutes - inventory sheet
MAINTENANCESTRATEGY
Fig. 1: Configuration of the maintenance concept for protection works
standardized instruments are developed. These instruments can be splitted in the operational instruments, the instruments of documentation and the instruments of assessment.
OPERATIONAL INSTRUMENTS The three control levels consider the economic limits. In level 1 all structures will be periodically inspected e.g. by lumbermen during the annual inspection of the Austrian torrents (task of the community due to the Forest Act). If a damage on a structure is identified a competent expert will do a level 2 inspection. If there is no chance of assessing the structures actual condition a level 3 inspection will be held. Level 1 and 2 are done with visual inspection methods. For a level 3 inspection complex engineering methods are used, e.g. analyses of material samples, measuring systems, static and hydraulic simulations. Ideally this inspection level is carried out by an interdisciplinary expert team.
INSTRUMENTS OF DOCUMENTATION AND ASSESSMENT
A consistent and comparable description of the structures’ damages is assured by well developed control minutes and a damage catalogue for torrent protection works. This catalogue is based on the experience of practitioner and on researchers theoretical background. The catalogue contents a classification of damages and detailed descriptions for several types of damages. The classification scheme divides the damage-types in those with relations to the ultimate limit state, to the serviceability limit state and to the durability limit state (terms in according to EUROCODE 0). In addition the classification considers the type of structure and the design material. These developed instruments enable effective decisions regarding type and timing of measures and enable a realistic assessment of the structure condition, too.
The collected data will be stored in a data base of the so called torrent and avalanche cadastre (WLK), which will be used for maintenance planning and inspection planning to get a precise and efficient maintenance management. It can also be used as base for simulations of further developments depending on different maintenance scenarios, to optimise life-cycle costs.
Keywords: structural mitigation measures, monitoring, maintenance, torrential barriers, protection works, structure condition
MONITORING of Torrential Barriers
measurement - attendance
- corrective maintenance MAINTENANCE condition assessment
CONDITION ASSESSMENT - condition levels
CONDITION FORECAST -model simulations
INSPEKTION
measurement - rebuilding of components - rebuilding of structure
REBUILDING
measurement - enlargement - modification - adaption
CHANGING
MEASUREMENT
IDENTIFICATION
CONDITION ASSESSMENT DATACOLLECTION - Level 1 Inspection - Level 2 Inspection - Level 3 Inspection DOCUMENTATION - control minutes - inventory sheet
MAINTENANCESTRATEGY
Fig. 1: Configuration of the maintenance concept for protection works
standardized instruments are developed. These instruments can be splitted in the operational instruments, the instruments of documentation and the instruments of assessment.
OPERATIONAL INSTRUMENTS The three control levels consider the economic limits. In level 1 all structures will be periodically inspected e.g. by lumbermen during the annual inspection of the Austrian torrents (task of the community due to the Forest Act). If a damage on a structure is identified a competent expert will do a level 2 inspection. If there is no chance of assessing the structures actual condition a level 3 inspection will be held. Level 1 and 2 are done with visual inspection methods. For a level 3 inspection complex engineering methods are used, e.g. analyses of material samples, measuring systems, static and hydraulic simulations. Ideally this inspection level is carried out by an interdisciplinary expert team.
INSTRUMENTS OF DOCUMENTATION AND ASSESSMENT
A consistent and comparable description of the structures’ damages is assured by well developed control minutes and a damage catalogue for torrent protection works. This catalogue is based on the experience of practitioner and on researchers theoretical background. The catalogue contents a classification of damages and detailed descriptions for several types of damages. The classification scheme divides the damage-types in those with relations to the ultimate limit state, to the serviceability limit state and to the durability limit state (terms in according to EUROCODE 0). In addition the classification considers the type of structure and the design material. These developed instruments enable effective decisions regarding type and timing of measures and enable a realistic assessment of the structure condition, too.
The collected data will be stored in a data base of the so called torrent and avalanche cadastre (WLK), which will be used for maintenance planning and inspection planning to get a precise and efficient maintenance management. It can also be used as base for simulations of further developments depending on different maintenance scenarios, to optimise life-cycle costs.
Keywords: structural mitigation measures, monitoring, maintenance, torrential barriers, protection works, structure condition
MONITORING of Torrential Barriers
measurement - attendance
- corrective maintenance MAINTENANCE condition assessment
CONDITION ASSESSMENT - condition levels
CONDITION FORECAST -model simulations
INSPEKTION
measurement - rebuilding of components - rebuilding of structure
REBUILDING
measurement - enlargement - modification - adaption
CHANGING
MEASUREMENT
IDENTIFICATION
CONDITION ASSESSMENT DATACOLLECTION - Level 1 Inspection - Level 2 Inspection - Level 3 Inspection DOCUMENTATION - control minutes - inventory sheet
MAINTENANCESTRATEGY
Fig. 1: Configuration of the maintenance concept for protection works
standardized instruments are developed. These instruments can be splitted in the operational instruments, the instruments of documentation and the instruments of assessment.
OPERATIONAL INSTRUMENTS The three control levels consider the economic limits. In level 1 all structures will be periodically inspected e.g. by lumbermen during the annual inspection of the Austrian torrents (task of the community due to the Forest Act). If a damage on a structure is identified a competent expert will do a level 2 inspection. If there is no chance of assessing the structures actual condition a level 3 inspection will be held. Level 1 and 2 are done with visual inspection methods. For a level 3 inspection complex engineering methods are used, e.g. analyses of material samples, measuring systems, static and hydraulic simulations. Ideally this inspection level is carried out by an interdisciplinary expert team.
INSTRUMENTS OF DOCUMENTATION AND ASSESSMENT
A consistent and comparable description of the structures’ damages is assured by well developed control minutes and a damage catalogue for torrent protection works. This catalogue is based on the experience of practitioner and on researchers theoretical background. The catalogue contents a classification of damages and detailed descriptions for several types of damages. The classification scheme divides the damage-types in those with relations to the ultimate limit state, to the serviceability limit state and to the durability limit state (terms in according to EUROCODE 0). In addition the classification considers the type of structure and the design material. These developed instruments enable effective decisions regarding type and timing of measures and enable a realistic assessment of the structure condition, too.
The collected data will be stored in a data base of the so called torrent and avalanche cadastre (WLK), which will be used for maintenance planning and inspection planning to get a precise and efficient maintenance management. It can also be used as base for simulations of further developments depending on different maintenance scenarios, to optimise life-cycle costs.
Keywords: structural mitigation measures, monitoring, maintenance, torrential barriers, protection works, structure condition
