Studies on Pasture Facilities in the Snowy Area : II. Deterioration of pasture fence materials

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Other Title
  • 積雪寒冷地における放牧施設に関する研究 : II.牧柵材料の耐久性状について
  • 積雪寒冷地における放牧施設に関する研究-2-牧柵材料の耐久性状について
  • セキセツ カンレイチ ニ オケル ホウボク シセツ ニ カンスル ケンキュウ

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The deterioration of steel materials was made clear by investigating pasture fences which were constructed in the snowy highland of Iwate Prefecture in 1976-1979. These fences were composed V-shaped steel posts with over 450g/m^2 zinc coating and 4-barbed wire made of # 14 wire with over 22g/m^2 zinc coating. The rust on the surface of post was not found except on a part of the post's head which was hit at the time of fence construction, and a part of which the small hooks of post were broken by the snow settling load. The rust of the barbed wire was found much more on which the wire was older and on the upper step of the wire (Fig.1). The breaking of the barbed wire was found more in the second and third wire from the top than in the top or the bottom on 4-wire fence (Fig.2). Above 70% of these breaking occured within 20cm of the post (Fig.3). It is surmised that the breaking of the wire occured mainly by the snow settling load than a lowering of wire strength with the rust because of a low correlation between the rate of the wire's rust and the percentage of the wire's breaking. From the maintenance stanpoint for pasture fences in the snowy area, the useful life of the barbed wire needs more zinc coating. As the management of fences to decrease the breaking of the wire, it is necessary to develop the fence construction method which the wire is not loosened, and to plan how to hang the wire on the post and how to fix up the loosened wire.

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