Experiment of an inflatable weir with steel gates - IZW · PDF file• The site was chosen...
Transcript of Experiment of an inflatable weir with steel gates - IZW · PDF file• The site was chosen...
![Page 1: Experiment of an inflatable weir with steel gates - IZW · PDF file• The site was chosen on an existing dam, where a first experiment of inflatable dam was conducted 20 years ago.](https://reader030.fdocument.pub/reader030/viewer/2022013014/5aac874a7f8b9a693f8d2ccd/html5/thumbnails/1.jpg)
Experiment of an inflatable weir with steel gates
Villers – devant – Mouzon
BAW- Symposium Inflatable dams19 June 2008
Timothée CHRETIEN – VNF DIR Nord-EstNicolas PICHON - Cetmef
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Presentation structure
• Experiment’s context ;• Construction spot selection ;• Obermeyer spillway gates ;• Experimental follow-up ;• First results.
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Context• An extensive rebuilding program
Aim : improving weirs’ exploitation by:– Providing a high reliability ;– Securing operations ; – reducing the painfulness ;– Guaranteeing a precise water level regulation.
• Explorate innovative technique(s) to:– cut dam building costs;– reduce construction durations.
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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The site of Villers devant Mouzon• The dam of Villers devant Mouzon is located on the river
Meuse (North-east of France) ;• The original dam is a needle dam ;
• The site was chosen on an existing dam, where a first experiment of inflatable dam was conducted 20 years ago.
• Context
• The site
• IDSG
• Experimental follow-up
• First results
![Page 5: Experiment of an inflatable weir with steel gates - IZW · PDF file• The site was chosen on an existing dam, where a first experiment of inflatable dam was conducted 20 years ago.](https://reader030.fdocument.pub/reader030/viewer/2022013014/5aac874a7f8b9a693f8d2ccd/html5/thumbnails/5.jpg)
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Obermeyer system
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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articulation
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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Ductil steel clamp
Anchor bolts
Panel with rib
Rubber hinge flap
Bolts linking gate to hinge
Bladder
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Some pictures...
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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Advantages• Anchor
– Efforts (water pressure) are linearly applied to the sill ;– No mechanical parts (without pivot) .
• Modular design– It can be very wide without intermediary piers ;– easy assembly and maintenance;– Transportation.
• Steel gates– Precise regulation of upstream water level ;– Protect the bladders of sediments, debris , UV and vandalism ;– An option allows relative movement of adjacent modules ;– An option allows to have several bladders for a single panel
>>> this option provides a high reliability in case of a bladdershould be out of order.
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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Limits
• Several concepts are patented ;• Difficulties to communicate with Obermeyer (type of
contract..) ;• Limited experiment feedback;• Vandalism ?
• Context
• The site
• IDSG
• Experimental follow-up
• First results
![Page 11: Experiment of an inflatable weir with steel gates - IZW · PDF file• The site was chosen on an existing dam, where a first experiment of inflatable dam was conducted 20 years ago.](https://reader030.fdocument.pub/reader030/viewer/2022013014/5aac874a7f8b9a693f8d2ccd/html5/thumbnails/11.jpg)
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The IDSG in Villers devant mouzon
• Dam's height is 2,00m , total width of 17,69m ;• 3 modules each 5.87m wide. Steel gates were made from a
plate 16mm thick. An epoxy coating protects the gates from corrosion ;
• 3 bladders (EPDM, chlorubutyle rubber, natural rubber reinforced with 4 layers of polyester fabric, an external layer of EXX-pro improves resistance to UV abrasion and chemical attacks). Each bladder weights 400 kg. Normal pressure is 1,4 bar ;
• 59 steel bolts connect the bladders to the sill.
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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The works in few numbers...
• 2 months : works’ duration ;• 2 days : mounting of IDSG ;• A gate weights 2,5 T ( dam’s heaviest part).
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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…some pictures.
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…civil works...
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…assembly
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Experimental follow-upGoals
• Understanding the different aspects of designing and building such dams ;
• Experiencing and analysing their mechanic and hydraulic behaviour ;
• Measuring their regulation capacity for navigation purposes ;
• Studying environmental impacts ;
• Estimating the standardization potential ;
• Analysing their operation and maintenance needs ;
• Evaluating their operation and maintenance costs ;
• Assessing their lifetime.
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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Tests on the bladders
• Aim : measure mechanical properties of the bladders ;
• Lab tests– Tension test ;– Creep test ;– Colorimetry ;– Hardness ;– Spectrometry...
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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19 june 2008 20
System tests
• Aim : test different simulated failures
• Events planned:– Power cuts ;– Leak in the air supply system ;– Gauge faults ;– …
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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19 june 2008 21
Puncture tests
Program planned:
• Test the case of different holes (different diameters) in the bladder ;
• Observe the efficiency of dam ;• Observe the evolution of holes ;• Evaluation ;
• Context
• The site
• IDSG
• Experimental follow-up
• First results
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First results
• in situ :faulty construction ?
– Problem of watertightness (between dam and abutments) ;
– tightening torque of bolts linking gate to hinge are heterogeneous ;
– One anchor bolt broke.• In functioning :
– A precise regulation of upstream water level ;– Some difficulties with gauges (water level,
inclinometer) ;– Problem of watertightness ( between the 2 different
modules) ;
• Context
• The site
• IDSG
• Experimental follow-up
• First results
![Page 23: Experiment of an inflatable weir with steel gates - IZW · PDF file• The site was chosen on an existing dam, where a first experiment of inflatable dam was conducted 20 years ago.](https://reader030.fdocument.pub/reader030/viewer/2022013014/5aac874a7f8b9a693f8d2ccd/html5/thumbnails/23.jpg)
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First results
Lab Tests:• Context
• The site
• IDSG
• Experimental follow-up
• First results
![Page 24: Experiment of an inflatable weir with steel gates - IZW · PDF file• The site was chosen on an existing dam, where a first experiment of inflatable dam was conducted 20 years ago.](https://reader030.fdocument.pub/reader030/viewer/2022013014/5aac874a7f8b9a693f8d2ccd/html5/thumbnails/24.jpg)
Vielen Dank fuer IhreAufmerksamkeit!
Voies Navigables de FranceFrench Waterways
www.vnf.fr
Centred'Études TechniquesMaritimes et Fluviales
CETMEF
CETMEFInstitute for Maritime andInland waterways
www.cetmef.equipement.gouv.fr
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