International Symposium on Mitigative Measures against Snow ...
International Symposium on Mitigative Measures against Snow ...
International Symposium on Mitigative Measures against Snow ...
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<str<strong>on</strong>g>Internati<strong>on</strong>al</str<strong>on</strong>g> <str<strong>on</strong>g>Symposium</str<strong>on</strong>g> <strong>on</strong> <strong>Mitigative</strong> <strong>Measures</strong> <strong>against</strong> <strong>Snow</strong> Avalanches<br />
Egilsstaðir, Iceland, March 11–14, 2008<br />
3.3 Corrosi<strong>on</strong> protecti<strong>on</strong><br />
Avalanche protecti<strong>on</strong> measures are exposed to varying corrosive envir<strong>on</strong>ments. The<br />
corrosi<strong>on</strong> protecti<strong>on</strong> of the individual elements can be adapted to the prevailing situati<strong>on</strong> in<br />
order to achieve an adequate life expectancy of the structure. Standard galvanized products<br />
were selected for the planned life expectancy of the actual measures.<br />
4. COST AND CONTROL<br />
All together were nine light retenti<strong>on</strong> meshes varying in length from 5 to 18 metres, installed<br />
above the new tourist resort in Sirdal. Total length 84 metres. All foundati<strong>on</strong>s were in rock.<br />
The average cost per metre was 3000 and 3400 NOK, respectively for 2 m and 3 m high<br />
meshes (2005). This included the time the c<strong>on</strong>tractor needed to establish rati<strong>on</strong>al methods for<br />
producti<strong>on</strong> of posts as well as practical techniques for anchoring and installati<strong>on</strong> of the<br />
structures. Even so the cost was approximately <strong>on</strong>e fifth of a c<strong>on</strong>venti<strong>on</strong>al supporting<br />
structure of comparable height.<br />
The light run-proof mesh and simple c<strong>on</strong>structi<strong>on</strong> of the foundati<strong>on</strong> and posts, makes it easy<br />
to maintain the structure when necessary. The Norwegian Geotechnical Institute will carry<br />
out routine c<strong>on</strong>trol of the c<strong>on</strong>structi<strong>on</strong>s for some years to m<strong>on</strong>itor the performance and<br />
functi<strong>on</strong>ality of the new measure.<br />
ACKNOWLEDGEMENT<br />
The authors wish to thank the c<strong>on</strong>tractor Fjellrenovering AS for creative ideas, fruitful cooperati<strong>on</strong><br />
and documentati<strong>on</strong> of the installati<strong>on</strong>s.<br />
REFERENCES<br />
Fjellrenovering AS. Sinnes panorama. Rasforbygning. CD med bilder. (Avalanche c<strong>on</strong>trol<br />
structures. CD with photos.)<br />
NGI-Rapport 20041511-1. Sinnes, Øvre Sirdal. Sikring av utvidet planområde. (Protecti<strong>on</strong><br />
of expanded planning area.)<br />
NGI-Rapport 20041511-2. Sinnes, Øvre Sirdal. Teknisk beskrivelse av tiltak. (Technical<br />
descripti<strong>on</strong> of safety measures.)<br />
NGI Teknisk notat 20041511. Sinnes, Øvre Sirdal. Sluttbefaring av nybygde skredforbygninger.<br />
(Field c<strong>on</strong>trol of the new avalanche safety measures.)<br />
Hestnes and Valstad 57
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