Naslov
Time study in the exploitation of mountainous thinnings by group labour

Autori
Zečić, Željko ; Poršinsky, Tomislav ; Šušnjar, Marijan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstracts "Emerging harvesting issues in technology transition at the end of century" / Horvat, Dubravko - Zagreb : Šumarski fakultet Sveučilišta u Zagrebu, 1999, 115-116

Skup
IUFRO Division 3 Meeting, RGs: 3.04.00 Operational planning and control; work study, 3.06.00 Forest operations under mountainous conditions, 3.07.00 Ergonomics

Mjesto i datum
Opatija, Hrvatska, 27.09.1999. - 01.10.1999

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
time study; cutting and processing; skidding; reception of wood; standardisation of time

Sažetak
Measuring group labour means measuring used time used of a larger number of workers simultaneously. One of the greater difficulties lies in the scattered positions of the workers and machinery in the stand and auxiliary storage. Therefore, it is impossible to measure their work from one location and with one recorder. This means that for simultaneous measuring of work for all the workers in a group a larger number of recorders is necessary regardless of the applied method of measurement (continuous timing, repetitive timing or work sampling). This study deals with the advantages and drawbacks of standard methods of measuring the time used for cutting, processing, extraction and reception of wood in a group labour effort. It also illustrates some of the results of the research. The study was conducted in a beech thinning, 55 years old in the mountainous region of the Central Pannonian Mountains at an altitude of 550 and 700 m above sea level. The mean breast height diameter of the cut trees was 21 cm and the mean volume was 0.30 m3. The working unit consisted of 5 workers: 2 cutters, 2 tractor operators and one worker at the auxiliary storage. The working unit was equipped with two tractors, three chainsaws, and other necessary equipment. The effective time of the cutters for cutting and processing, preparation and fastening of the load was 3.69 minutes per tree, i.e. 13.82 min/m3. The effective time of the workers during finishing and unloading the wood assortments at the auxiliary storage amounts to 20.69% of the total time. The effective time per one piece of roundwood is 0.99 minutes i.e. 6.21 min/m3. An Ecotrak V-11-1033F choker tractor was used for skidding. The skidding was conducted along a downhill slope. The average slope of the skidding line was 12%. For a skidding distance of 400 m the effective cycle time was 25.54 minutes. The standard time was 28.91 min/m3. The most time in a cycle is used by the tractor while working in the felling area and amounts to 46.8% of the total time, i.e. 59.4% of the effective time. The standard tractor time for a distance between 50 to 550 m ranges from 26.72 min/m3 to 39.06 min/m3. The standard time for cutting and processing together equals 14.78 min/m3. From the listed values it is possible to calculate the relation between the standard times for cutting and extraction, and according to this establish a dynamically ideal group organisation.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija

POVEZANOST RADA