Original scientific paper
Workload Benefits of Using a Synthetic Rope Strawline in Cable Yarder Rigging in Norway
Giovanna Ottaviani
orcid.org/0000-0001-8357-4971
; Norwegian Institute for Forest and Landscape Section for Forest Technology and Economics Høgskoleveien 8, 4132 Ås NORWAY
Bruce Talbot
orcid.org/0000-0003-1935-5429
; Norwegian Institute for Forest and Landscape Section for Forest Technology and Economics Høgskoleveien 8, 4132 Ås NORWAY
Morten Nitteberg
; Norwegian Institute for Forest and Landscape Section for Forest Technology and Economics Høgskoleveien 8, 4132 Ås NORWAY
Karl Stampfer
; University of Natural Resources and Applied Life Sciences Vienna Institute of Forest Engineering Peter Jordan Strasse 82 1190 Vienna AUSTRIA
Abstract
This study examined the difference in workload brought about by exchanging a 3.5mm steel rope with a 4.0 mm synthetic fiber rope when dragging a strawline up a 300 m corridor in setting up a new cable-yarding line. Physiological workload was monitored through heart rate measurement, while the physical forces acting on the subject (rope mass and friction) were quantified using a dynamometer attached to a belt. While there was a substantial difference in force between rope types at full extent (140 N vs. 40 N), the result was less significant when seen against the total work required in moving the subjects own body mass up the slope. The direction of the resultant force vector appears to play an important role in the way that strain is experienced. It was discovered that 300 m was the maximum hauling distance for a single person using this rigging method with a steel wire strawline, whereas for the synthetic rope, the same tensile force would only be reached at 1200 m. This alone has important implications for labor saving amongst small cable logging teams.
Keywords
cable logging; workload; heart rate; synthetic rope
Hrčak ID:
72658
URI
Publication date:
15.9.2011.
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