著者

岡本 泰彦 川畑 雅樹 正代 知幸 辻本 康平

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.136, no.6, pp.52-63, 2020-06-30 (Released:2020-06-30)

参考文献数

7

---

Ube Industries' Isa Cement Factory introduced a rock cutting machine“2500SM”capable of continuous excavation by rotating a drum equipped with a cemented carbide bit from the viewpoint of effective recovery limestoneresources. Because it can excavate with low vibration and low noise, it can reduce the distance from the surrounding private houses that have been secured in consideration of the effect of blasting, and in order not to loosen the excavated surface, the bench angle of the excavated surface is steeply inclined and berm is minimized. It was because it was judged that the minable amount could be expanded by minimizing the berm. In the early stages of the introduction, cutting bits were broken unexpectedly, and the frequency of replacement increased, resulting in a decrease in mining efficiency. In addition, the excavation slope using a rock cutting machine“2500SM” has a smoother surface and no large cracks. In addition, in the evaluation using methods of elastic wave exploration, ground penetrating radar and infrared camera, the slope of excavation is compared with that by blasting. It was confirmed that the soundness was high. The effects of cutting bit improvements was evaluated, the expected excavation area, the soundness and safety of the rock slope, and the expansion of the minable amount that were expected when the rock cutting machine “2500SM” was introduced. In this paper,we repot the evaluation results.