The Impact of the Streching Road Grade on the Costs of the Forest Roads Construction
DOI:
https://doi.org/10.54652/rsf.2008.v38.i1.177Keywords:
forest truck road, road gradeAbstract
UDK 630*38:625.725
630*38:657.471
Designing of the forest truck roads by establishing an adequate balance between technical, economical and environmental factors is a very complex task for designers. It is very difficult to design the road which will have the best technical elements, maximum adjustment to the terrain conditions, minimum construction costs and the best exploitation results at the same time. The significant factor in these analyses is the longitudinal slope of the road grade of the forest truck roads. In this paper three variants of the road grade of the forest truck roads has been given. After the analysis was carried out the results indicated that more streched road grades with more suitable longitudinal slopes (variant 1) obviously require an increase in the terrain works scope:
- cut in from 4,44 m3 to 5,48 m3 per meter of length
- filled from the existing 3,75 m3 to 4,84 m3 per meter of
The road grade with better adjustment to the terrain, frequent vertical curves of smaller radii and higher longitudinal slopes (variant 2 in this paper) has been characterized by smaller scope of the terrain works in comparison with other proposed variants.
During the design works of the road grade longitudinal slope of the forest truck roads it is necessary to take into consideration the following elements significant in the road exploitation: velocity, safety, maintenance costs, long-term exploitation of the road, etc. Because of that, in the situations when these factors are dominant we shall have to design the road grade with a longitudinal slope which fulfils the requirements in the road exploitation (in this paper – the road grade proposed in variant 1). On the other hand, if the best adjustment to the terrain conditions and minimum construction costs are expected from the forest truck road, the solution will be the road grade of forest truck road, in principle, the road grade which has been proposed in variant 2 in this paper.
References
BAJRIĆ, M., 1997: Uporedna analiza korekcije nivelete na šumskom kamionskom putu, Diplomski rad, Šumarski fakultet, Sarajevo.
BAJRIĆ, M., 2005: Mogućnost konverzije glavnih traktorskih puteva nagiba do 12 % u prilazne kamionske puteve, Magistarski rad, Šumarski fakultet, Sarajevo.
FAO, 1998: A Manual for the planning, design and construction of forest roads in steep terrain, p. 1 – 188.
PIČMAN, D., 1993: Utjecaj konfiguracije terena i hidrografskih prilika na ekonomsku opravdanost izgradnje optimalne mreže šumskih prometnica, Disertacija, Šumarski fakultet Zagreb.
PIČMAN, D., 2007: Šumske prometnice, sveučilišni udžbenik. Šumarski fakultet Sveučilišta u Zagrebu, str. 1-460.
POTOČNIK, I., 1996: Mnogonamenska raba gozdnih cest kot kriterij za njihovo kategorizacijo. Disertacija, Universa v Ljubljani, Biotehniška fakulteta, Odelek za gozdarstvo, str. 1 - 241.
Privremeni tehnički propisi za projektovanje šumskih puteva u BiH, 1957.
SOKOLOVIĆ, DŽ., 2008: Uticaji nagiba terena na pravilan izbor vrste šumskog transportnog sredstva, Disertacija, Šumarski fakultet, Sarajevo
ŠIKIĆ, D., BABIĆ, B., AT ALL 1989: Tehnički uvjeti za gospodarske ceste, Znanstveni savjet za promet JAZU, Zagreb.
Glavni projekat šumskog kamionskog puta „Radonjičko raskršće - odjel 94“, Šumsko gazdinstvo „Jahorina“ Pale.
