engleski

Promotion of teamwork in mountain thinning stands of middle-aged broadleaf stands

The paper presents the research results and the optimisation of teamwork in the exploitation of broadleaf thinning stands in a hilly area. The field research was carried out in the forestry administration area of Bjelovar, the management unit of Ivanska Prigorska Šuma, with a team consisting of six workers. The research was focused on the following: cutting and limbing ; tractor skidding ; processing ; wood assortment delivery, and stacking of long timber by tractor crane on landing. The teamwork was carried out in a 66-year-old thinning beech stand. The work team consisted of two cutters, two tractor drivers, one cutter-customer, and one crane driver. The team is controlled daily by a foreman. All members of the team were surveyed by a regression chronometry method with the related wood volume. Based on the recorded time, time study analysis was made by individual jobs and totally. The structure of the single effective times and delays was determined, and the added time was formed. The cutters spent 38.14% and 48.73% respectively of the effective time out of the total time. Out of the total time, the cutter-customer spent 16.55%, and the tractor crane 25.12% of the effective time. The average added time factor of the cutters was 1.57, while the one of the tractor was 1.29. The respective values of the cutter-customer and the crane tractor were 1.88 and 1.87. Using the mathematical/statistical methods of a multiple linear regression, the data of the measured and calculated values were processed. The obtained mathematical models of the effective time calculation plus added time factor were used for the calculation of the time norm and the daily effect of each member of the team. Time norms and daily outputs were calculated in several variants for better modelling of the team. The total time norm of the sub team depends on the tractor skidding distance. With the distance of 150 m – 750 m, the time norm of one sub team ranged between 44.67 min/m3 and 59.10 min/m3, while the respective values of the second sub team were 47.78min/ m3 and 61.27min/m3. The daily output per team member may be achieved in the amount of between 10.23 m3/day at a distance of 150 m, and 5.38 m3/day at a distance of 650 m. The costs per product unit ranged between 83.91 kn/m3 (150m) and 159.52kn/m3 (650m).

Cutting and limbing; skidding; optimal team; productivity; costs

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