J. For. Sci., 2002, 48(9):408-414 | DOI: 10.17221/11901-JFS

A contribution to the detection of sliding resistance and calculation of critical slope inclination at timber dragging by horseOriginal Paper

S. Navrátil, A. Skoupý
ALLWOOD, a.s., Zlín, Czech Republic
1 Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology,
2 Brno, Czech Republic

The paper deals with the determination of sliding resistance at dragging timber by horse and with the calculation of critical slope inclination in situations of threatening spontaneous movement of timber. These are reasons why the horse should not be used in such conditions. Different conditions of skidding trail surface are considered in winter and summer periods of the year. Sliding resistance was determined by using an original methodology in which the acting forces are measured by strain gauges directly at the timber dragging by horse. It was found out that the coefficient of sliding resistance cannot be determined as one concrete figure but rather as an interval of values since it is considerably variable with the character of terrain and character of the surface of dragged log. This is why the critical slope inclination should be determined in a certain interval, too, in order to include the measure of acceptable risk. The measure of acceptable risk is defined by using an auxiliary coefficient of safety whose value should range in the interval from 0.5 to 1.0 as a value indirectly proportional to the magnitude of sliding resistance coefficient.

Keywords: forest technology; timber dragging; horse; sliding resistance; critical slope inclination

Published: September 30, 2002  Show citation

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Navrátil S, Skoupý A. A contribution to the detection of sliding resistance and calculation of critical slope inclination at timber dragging by horse. J. For. Sci. 2002;48(9):408-414. doi: 10.17221/11901-JFS.
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    References

    1. BECK W., 1989. Zum Einsatz von Pferden im Ruckeprozess. Sozial.-Forstwirtsch., 39: 109-111.
    2. DRÁPELA K., ZACH J., 2000. Statistické metody II. Brno, MZLU: 144.
    3. FAO 2, 1997. Planning Forest Roads and Harvesting Systems, FAO Forestry Paper 2, Rome: 148.
    4. HEINRICH R., 1987. Appropriate Wood Harvesting Techniques in Mountain Forestry in Developing Countries, Role of Forest Research in Solving Socio-economic Problems in the Himalayan Region. IUFRO, Pakistan: 178-193.
    5. HOFFMAN V., 1992. Untersuchung physischer Beanspruchungen des Pferdes bei Rückearbeiten. [Diplomarbeit.] Göttingen, Fachhochschule Hildesheim/Holzminden Fachbereich Forstwirtschaft in Göttingen: 68.
    6. LETOURNEAU L.R., 1987. Selection of logging systems and machinery. In: FAO 78-Appropriate wood harvesting in plantation forests, Training material from the FAO/Finland Training Course, FAO Forestry Paper 78, Rome: 266.
    7. NAVRÁTIL S., 2002. Posouzení vybraných limitujících faktorů ovlivňujících soustřeďování dříví koňmi. [Doktorská dizertační práce.] Brno, MZLU: 127.
    8. RADVAN J., 1990. Kůň v lesním hospodářství, příručka pro kočí režijních potahů. Praha, SZN: 229.
    9. RODRIGUEZ E.O., MAYER A., 1986. Wood extraction with oxen and agricultural tractors. FAO Forestry Paper 49, Rome: 92.
    10. SIMANOV V., 1993/1994. Osnovy přednášek k předmětu těžba a technologie lesní výroby.
    11. STREHLKE B., 1987. Safety in logging, in ergonomics applied to logging. FTP, 18, Helsinki: 87-94.
    12. WATERSON J., 1994. The draught horse in UK forestry. Quart. J. For., 88: 309-313.

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