broj: 3/1995
pdf (8,7 MB) 

ORIGINAL SCIENTIFIC PAPERS  
Krpan, A. P. B., Ivanović, Ž.  UDK 630*377.2 001  
Yarding Pedunculate Oak logs with the Steyr KSK 16 Cable Crane pdf HR EN  75  
Conclusions: This paper is a study on the possibilities of using the KSK 16 cable crane in hauling the pedunculate oak logs under the conditions of highly moist lowland forest soils. Broad studies of work and time were done within the field research, resulting in the survey of 339 circles by the stopwatch study, according to the previously detailed time classification and whole day work surveys. The average load was 2,55 m3 counting 2,18 pes of logs. The volume of the mean log is 1,17 m3 length 4,9 m, peeledlogdiameter 55 cm. The biggest log diameter was 90 cm, length 9,2 m, the biggest volume 4,2 m3. Out of the 49,7% of the whole surveyed time, 15,7% was spent on full wagon drive, 15,0% on loading, 12,1% on empty drive and6,9% on unloading. Of the total surveyed time, 50,3% was spent on the general times. The major part of the general time, 62,9% refers to technical breaks. Mealbreaks took 26,6% from the general times, 7,5% from occasional jobs and 2,1 %from preparatory finishing time. Additional time was 23,9% of the effective time. During cable crane survey the average output was 67,42 m3/day. Effective circle time is 9,03 minutes; total circle time together with the chosen additional time: 11,19 min. Average time standard is 4,39 min/m3, and the average expected daily output 102,5 m3. The average speed of empty wagon drive is 2,68 m/s, full wagon 2,06 m/s. The surveyed times of full and empty wagon drive were equalized with the straightline equation. They grow with the increase of the haul distance, the more inclined growth being up to 300 m distance. The average line pull speed with chokers is 0,57m/s, side haul 1,14 m/s, the ratio being 1:2. The average line pull and haul distance is 17,5 m. Time input for the two operations proportionally increases with the increased distance, the haul speed behaving similarly. The line pull speed grows up to 25 m and drops afterwards. Time standard is equally proportional, and the daily output is a conversely proportional value, to haul distance. Time standard for 75 m is 2,95 min/m3, and 5,53 min/m3 for 575 m. The daily output for 75 m is 152,54 m3, 81,37 m3 for 575m. The output decrease factor shows that the 350 moutput is by 30%, the one of 500 m by 40% lower when compared to the 100 moutput. The working time of the cable crane takes 72,3% of the efficient time or 35,8% of the total surveyed time. By reducing the general times down to the level of the additional times, the working time would amount to 58,3% in re alation to the total time. Key words: cable crane; lowland; work and time study; time standard; producibility  
Pičman, D., Tomaz, I.  UDK 630*373.3 001  
Determination of the Compartment Centre by the Application of a Personal Computer for the Purpose of Working out the Medium Distance for Dragging pdf HR EN  91  
PROFESSIONAL PAPERS  
Starčević, T.  UDK 630*432.0+232  
Selection of Damaged Trees and Remediation PDF  105  