| Summary: | オーストリアMAYR-MELNHOF FORSTTECHNIK 社製WANDERFALKE U-AM-2to（以下WF と略記）とIHI 建機社製NR301（以下NR）の作業観測を行い，その労働生産性と作業費用，最適路網密度について分析した。最大集材距離が長くなるほど労働生産性は下がるが，WF とNR を比較すると，サイクルタイムの影響を受けて最大集材距離が長くなるほどWF の方が労働生産性が高く，また荷掛け材積が大きくなるほど両者の差は大きくなった。WF はNRに比べて機械価格が高く，架設撤去に時間を要したため，最大集材距離が123m 以下の列状間伐と最大集材距離が88m 以下の皆伐ではNR が費用面で有利と計算された。タワーヤーダを導入して作業費用を低減するには，長期にわたって路網をくり返し使用し，1 回当りの荷掛け材積を大きくするのが有用である。 The productivity, operational cost and optimal forest road network density for WANDERFALKE U-AM-2to (WF) and NR301 (NR) industrial tower yarders were analyzed. The results showed clearly that productivity decreased as the yarding distance increased. The productivity of the WF became greater than that of the NR as the yarding distance increased because of the effect of the cycle time. This difference increased as the load volume increased. As the WF yarder had a higher purchase price and it took more time to set up compared to the NR, the NR yarder became advantageous (yen/m3) when the maximum yarding distance was less than 123 m in strip-thinning and 88 m in clear-cutting. Therefore, in order to introduce tower yarders to achieve cost reduction, it is effective to increase the load volume during operations and to utilize the road network repeatedly for a long period. 論文 departmental bulletin paper
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