The time study of timber skidding in fir forest with forestry skider Bijol BWS 160

Leta 2016 je slovensko podjetje Bijol na trgu ponudilo nov izdelek, zgibni traktor Bijol BWS 160. Stroj so kupili tudi v podjetju SiDG, kjer je nastala potreba po študiju dela na tem gozdarskem zgibniku. Delo smo opravljali v gozdnogospodarski enoti Javornik. V raziskavi smo ugotavljali strukturo delovnega dne pri spravilu iglavcev in učinke spravila glede na različne smeri spravila, razdalje vlačenja, naklone vlak in razdalje zbiranja. V petih snemalnih dneh smo izmerili 1300,20 minute delovnega časa, 1030,8 minute produktivnega časa, opravili smo 38 ciklov spravila lesa, v katerih smo pospravili 191,4 m3 sortimentov. Ugotovili smo, da je v povprečnem delavniku 65,22 % produktivnega časa, delež neproduktivnega pa 34,78 %. Povprečno breme v naši raziskavi je znašalo 5,04 m3, največje 8,04 m3, najmanjše pa 1,37 m3 pri povprečni spravilni razdalji 311 m in povprečni razdalji zbiranja 28,6 m. Ugotovljeni povprečni dnevni učinek je bil 36,37 t oziroma 38,28 m3, medtem ko je povprečna učinkovitost dela v produktivnem času znašala 5,38 min/m3, v delovnem času pa 6,82 min/m3. Učinek dela najbolje pojasnimo s spremenljivkami razdalja vlačenja, razdalja zbiranja, masa bremena ter število kosov v bremenu.Slovenian producer Biol premiered the new Bijol BWS160 cable skidder to international market in 2016. The skidder was also bought in the Slovene state forests (SiDG), where the need for workstudies was soon evident. The case study took place in the forest management unit Javornik, where the structure of worktime, and efficiency of skidding was determined for skidding of conifers. The study aimed at controlling skidding direction, skidding distance, winching distance and inclination of skid trails. In five days of studies 1300,2 minutes of worktime, and 1030 minutes of productive time were measured. During that time 38 cycles were observed, in which 191,4 m3 of timber were skidded to the forest road. It was determined that in the average workday the productive time takes 66,22% of time, while the non-productive time takes 34,78%. The average skidder load in our research was 5,04 m3, with the range from 8,04 to 1,37 m3, while the average skidding distance amounted to 311 m, and the average distance to load was 28,6 m. The average daily efficiency was 36,37t or 38,28 m3, while the average productivity in productive time amounted to 5,38 min/m3, and to 6,82 min/m3 in worktime. Efficiency can be explained best with variables: skidding distance, distance to load, mass of load and number of logs in the load