임도 시설상태에 따른 대형 목재운송차량의 주행속도 분석

황진성*, 이관희, 지병윤

(국립산림과학원 산림기술경영연구소)

Analysis of the Traveling Speed of Large Logging Trucks

by the Conditions of the Forest Road

Jin-Sung Hwang*, Kwan-Hee Lee, Byong-Yun Ji

(Forest Technology and Management Research Center, National Institute of Forest Science)

요약: 최근 목재 운송비용 절감을 위해 점차 대형 목재운송차량(25톤 규모)의 활용이 증가하고 있다. 이에 본 연구에서는 목재운송에 적합한 임도 선형 개선 방안 마련을 위해 기설 간선임도 4개 노선(총 11.3km)을 대상으로 25톤 카고트럭(목재 21.8톤 적재)의 통행시험을 실시하였으며, 임도 구조별 운송속도를 조사ㆍ분석하였다. 분석결과, 주요 통행저해는 곡선부 확폭 또는 완화구간이 미확보된 구간에서 발생하였으며, 운송속도 또한 평균 3.8km/h로 양호구간의 약 46% 수준인 것으로 나타났다. 선형별 운송속도는 종단기울기의 경우 5% 미만 7.9km/h, 5～10% 8.3km/h, 10% 이상 7.6km/h였으며, 직선부의 구간거리별로는 50m 미만 8.5km/h, 50～100m 8.3km/h, 100～150m 9.8km/h, 150m 이상 9.3km/h인 것으로 나타났다. 곡선구간에서는 통행시 진행방향에 대한 가시거리 확보가 양호한 계곡부의 운송속도가 높은 것으로 나타났으며, 진출입각 및 곡선반지름은 커질수록 운송속도가 증가하는 것으로 나타났다. 본 연구는 향후 목재생산시대에 생산성을 높일 수 있는 임도 구조개선의 기초자료로 활용할 수 있을 것으로 판단된다.

Abstract: Recently, the utilization of large logging trucks (25 tons) has gradually increased to reduce the cost for transporting lumber. Therefore, this study conducted the transit of a 25-ton cargo truck (loading 21.8 tons of lumber) with four routes of the established main forest roads (a total of 11.3km) to prepare measures for the improvement of the forest road alignment appropriate for lumber transportation. We also investigated and analyzed the transporting speed by the structure of the forest road. As a result of the analysis, the major transit impediment took place in the sections with curvature widening or without transition distance, and the transporting speed too was 3.8km/h on average, which was about 46% of fine sections. For the transporting speed by the alignment, the longitudinal slope was less than 5% in 7.9km/h; 5∼10%, in 8.3km/h; and more than 10%, in 7.6km/h. By the distance of routes in the straight-line areas, less than 50m was in 8.5km/h; 50∼100m, in 8.3km/h; 100∼150m, in 9.8km/h; and more than 150m, in 9.3km/h. In curved sections, the transporting speed was high in the valley areas, since there are good for securing visible range in the direction of progress in transit, and the more the entry/exit angles and radius of curvature. It is judged that this study can be utilized as the baseline data for the improvement of forest roads and increase productivity for lumber production era in the future.