Bucking of conifers using the woody H60 processor on the Syncrofalke 3 T cable yarder in Alpine foothills

Marenče, Jurij (author), Vadnjal, Jernej (author), Košir, Boštjan (author)

V članku obravnavamo strojno krojenje iglavcev s procesorjem na žičnici na objektu v predalpskem hribovju. Predstavljamo natančnost izmere posameznih sortimentov in njen vpliv na njihovo tržno vrednost. Posamezna drevesa so podrli z motorno žago in jih nato z žičnim žerjavom s stolpom Syncrofalke, na katerem je bil montiran procesor Woody H 60, z drevesno metodo spravili do stojišča žičnega žerjava. Na stojišču žičnice so opravili dodelavo. Natančnost merjenja dolžin smo ponazorili s pomočjo njihove frekvenčne porazdelitve in modusa. Izračun deleža sortimentov znotraj 5 cm širokega intervala, v sredini katerega je bil modus porazdelitve (the best five), je znašal 54,3 %. Zaradi razlike med dejansko dolžino hloda in minimalno zahtevano dolžino smo ugotovili izgubo v višini 4,38 % od vrednosti sortimentov. Ugotovili smo, da je v prvi četrtini debla 64 % njegove celotne vrednosti. Tako smo že ob prvem prerezu dosegli skoraj 50 % skupne izgube, pri drugem prerezu pa že več kot 80 %. To so zgolj izgube, ki so nastale zaradi prevelike ali premajhne nadmere pri določenem sortimentu, torej zaradi premalo natančne izmere dolžin posameznih sortimentov.

• Language: English
• Keywords: krojenje, iglavci, glava za izdelavo, žični žerjavi, Slovenija
• Work type: Scientific work
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Year: 2009
• Number of pages: Str. 3-10
• Numbering: Št. 88
• PID: 20.500.12556/RUL-28771
• UDC: 630*32
• ISSN on article: 0351-3114
• COBISS.SI-ID: 2467494
• Publication date in RUL: 11.07.2014

Record is a part of a journal

• Title: Zbornik gozdarstva in lesarstva. forest and wood science & technology
• Shortened title: Zb. gozd. lesar.
• Publisher: Gozdarski inštitut Slovenije, Biotehniška fakulteta, Oddelek za gozdarstvo in obnovljive gozdne vire, Biotehniška fakulteta, Oddelek za lesarstvo
• ISSN: 0351-3114
• COBISS.SI-ID: 6206978

Secondary language

• Language: English

Abstract

The paper investigates mechanized bucking of conifers with a processor mounted on a cable crane system in the mountain conditions of the Alpine foothills. It analyses the measurement accuracy of various log types and explains its effect on the market price of these products. In the studied area, trees were felled by chain saw and the full-tree method was used to skid the felled trees to the cable yarder site using the Syncrofalke cable crane with a mounted Woody H 60 processor head. Further wood processing operations were carried out at the yarder site. Length measurement accuracy was illustrated through the frequency distribution and the modus of various lengths. The share of logs within a 5 cm interval - modus - (the best five) was 54.3%. The difference between the nominal log length and the minimum required length resulted in a loss of 4.38% of the total log value. Further more, it was established that the first quarter of the stem actually contained 64% of the total stem value. This means that the first cross-cut was responsible for nearly 50% of the total loss and the second crosscut pushed the figure to 80%. The present research only considered the losses incurred either by positive or negative cross-cut allowance or by insufficiently accurate length measurement of a certain log type.