著者

山田 胖

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.74, no.842, pp.461-468, 1958-08-25 (Released:2011-07-13)

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Endless rope railways have heretofore been widely utilized for haulage of ore or broken stone in many mines but the method was considered suitable only for short distances of about 1 kilometer or less.The writer, at the Okutama Limestone Quarry under his management, has installed an endlessrope- traction railroad of five-kilometer length for efficient haulage of large quantities of crushed limestone. This system was adopted in order to avoid the huge construction costs that would have been entailed had normal railroad been constructed over the craggy mountainous topography of the projected route.Construction costs were about half that of a regular narrow gauge railway, while after several years of operation it has been found that the running expenses come to less than half those of a railway line.(Improvement Features)A completely automatic cable clip was devised, permitting a rope speed more than double that of ordinary endless rope railway.In designing and selecting the route, deflections were possibly avoided and curve radii were kept at more than 200m. Grade is downward throughout the entire line and at the point of change of grade vertical curve of large radius were used, thus permitting extremely smooth coursing and rotation of rope for efficient high-speed operation with surprisingly low consumption of power.

著者

野坂 和彦

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.103, no.1193, pp.417-424, 1987-07-25 (Released:2011-07-13)

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Kanouyama limestone quarry is the latest developed one in Japan, of which construction project was embarked on in June 1980 and accomplished in December 1984, and which has enabled Chichibu Cement Co., Ltd to secure a long term supply source of the raw material for its cement.Kanouyama quarry is located in the Kanouyama mountain which is 1, 106 meters high from the sea level, in the southwest area of the Gunma prefecture and at its border to the Saitama prefecture.The annual production copacity of the quarry is 3 million metric tonnes of crushed limestone.The quarry introduced a remote control operational system with the adoption of the high-tech communication control with optical fiber cables and television that enables them to operate machines in the pit from the control room outside it.Another feature of the quarry is its belt-conveyors transport system which consists of three spans of the belt-conveyors set between the quarry and the cement plant, which goes 22.7 kilo-meters through one city, two towns and one village.The longest in the three spans of the belt-conveyors is 14.089 kilo-meters and a new record in the world of its kind.

著者

中村 元

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.81, no.920, pp.10-17, 1965-01-25 (Released:2011-07-13)

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The limestone resources in Akiyoshi district are biggest in Japan, and the quality of limestones is very high. We are now exploitating the biggest mine (300, 000t per month) in Japon. The principalproblem, therefore, is how to transport the limestones from mine to port economically. According to our study, the continuous transportation by conveyors is adopted. The total length of these comreyers is 16.5kms andwirll be a record in the world.

著者

三沢 清扶

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.95, no.1093, pp.131-136, 1979-03-25 (Released:2011-07-13)

参考文献数

7

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An experiment to break or weaken rocks by micro wave was performed. The output power of the micro wave has 20-80kW with 915MHz, which was applied in order to generate thermal stress in some kinds of rocks and concrete owing to temperature increase in the rocks according to the principle of “Dielectric Heating”en, the followings were obtained within this experiment.1) The temperature increase is approximately in proportion to the output power.2) The temperature increase is approximately in inverse proportion to the distance between aperture face of electric/magnetic horn and rock surface.3) The temperature increase becomes higher as aperture area of micro wave horn is smaller in constant output power.4) Main factor to crush the rock specimen by heating is to generate the thermal stress by rock heating.5) The rock with hither water content tends to have higher temperature increase in same rock tvne.6) The penetration depth of applied micro wave depends on dielectric constant and dielectric loss of the material.

著者

奥村 六郎

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:03694194)

巻号頁・発行日

vol.60, no.714, pp.323-326, 1944-10-22 (Released:2011-07-13)

著者

阿部 敬二郎

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.72, no.817, pp.387-393, 1956-07-25 (Released:2011-07-13)

被引用文献数

1 1

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Ônoura Coal Mine locats at the central district of Chikuho Coal Field, and has five pits, the Sin-Sugamuta, the 2nd, the 5th, the west 5th and 6th, being the Sin-Sugamuta pits shaft system and others incline system.Ônoura Coal Mine dated at 1884, and producing now about a million tons in a year. The vertical shafts in the Sin-Sugamuta are equipped with the skip winding and thecage winding, wich are operating automatically.The Ônoura's coal measures have eight workable seams between 23 meters high, so its are mined by pocket system and the goat is packed by hydraulic stowing. In this paper, I reports onthe mining method, the hydraulic stowing, the automatie skip-winding, the dressing and etc. in Ônoura.

著者

井上 健一 有田 健三 堀川 次男

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.74, no.845, pp.942-948, 1958-11-25 (Released:2011-07-13)

著者

折居 正美

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.85, no.976, pp.733-735, 1969-08-25 (Released:2011-07-13)

著者

兼子 次郎

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.87, no.1005, pp.916-919, 1971-11-25 (Released:2011-07-13)

著者

山口 梅太郎 宮崎 道雄

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.86, no.986, pp.346-351, 1970-05-25 (Released:2011-07-13)

参考文献数

15

被引用文献数

5 9

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There has been a rapid increase of interest to unconventional methods of fracturing rocks.Particularly, mechanics of thermal fracture, either by the application of direct heat or electrothermal conversion, are most favourable for practice.In this paper, the authors reported their experiments to measure the strength changes of rocks heated to high temperatures and the thermal fracture.From the experiments, several fracturing mechanisms of rocks heated to high temperatures were found. Which are;a) Thermal elastic stresses induced in rock.b) Transformation of crystal form of the constituting minerals of rock.c) Decomposition of the constituting minerals.d) Melting.e) Thermal expansion of the constituting minerals.f) Others.Neverthless these mechanisms are all affecting to thermal fracturing of rock, one of them is a dominant factor to fracture a particular kind of rock by heat, for example b) to granite and c) to limestone.

著者

矢野 寿文 渡辺 千典 紫雲 千鶴雄 赤祖父 辰夫 鳥栖 四郎 佐藤 俊一 佐藤 久 寺田 義久 末広 正己 倉山 俊 村尾 尚彦 岩沢 栄 河口 琢逸 岸 功 須賀 清勝 川内野 隆 渡部 稔 立山 正 久保 藤雄 武安 義勝 木村 伊和夫 安永 哲雄 野見山 栄 野上 辰之助

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.74, no.843, pp.669-714, 1958-09-25 (Released:2011-07-13)

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One of the essential problems of the Japanese coal mining industry is how to elevate its productivity. This is why we have been exerting ourselves to proceed concentration of working places.places. It goes without saying that the most important way to concentrate working places is to improve transportation services.This report was intended to show recent development of transportation equipment in and out of Japnanese coal mines. It will also give a forcast what type of development in future.All the transportation equipment which are refferrel to in this report show the top level techniques of this country.As a whole, it may be said that the Japanese transportation devices have been taking and will eakea straight way toward larger scale and automation running.

著者

小林 良二 酒井 昇 松木 浩二

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.99, no.1140, pp.81-86, 1983-02-25 (Released:2011-07-13)

参考文献数

12

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It is well known that rocks are more or less deteriorated by sudden cooling after being heated. Furthermore, by repeating the cycle of heating-cooling, rocks might be expected to be weakened more severely.In this paper, measuring the changes of the physical and mechanical properties of rocks including apparent specific gravity, P-wave velocity, Young's modulus and uniaxial compressive strength, the thermal fatigue process of rocks is characterized for four kinds of rocks, namely, OGINO tuff, EMOCHI welded tuff, AKIYOSHI marble and INADA granite. The cylindrical specimens are suddenly submerged into water after being heated and the cycle is automatically repeated in the testing machine.The maximum temperature and the maximum cycles in the experiment are 600°C and 54, respectively.The main results obtained are as follows:(1) The main failure mechanism is different between the crystalline rock and the sedimentary rock. The failure of the former takes place by the thermal interaction between minerals and that of the latter by the transient thermal stresses. As the result, crystalline rocks collapse to be particles or powders and sedimentary rocks are fractured initiating regular thermal cracks (Fig.6).(2) The strengths of the rocks except welded tuff decrease remarkably within 5 cycles if the temperature is sufficiently high and the cooling time is larger enough (Fig.3).(3) The strengths of the rocks except marble decrease as the cooling time increases. However, the additional effect is very small if the cooling time is larger than that needed for the specimens to be perfectly cooled (Fig.4).(4) The cycles at which the specimens collapse exponentially increase as the temperature decreases (Fig.5).

著者

大類 一久

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.85, no.976, pp.576, 1969-08-25 (Released:2011-07-13)

著者

北尾 久勝

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.87, no.1005, pp.845-850, 1971-11-25 (Released:2011-07-13)

著者

佐々木 高之助

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:03694194)

巻号頁・発行日

vol.52, no.615, pp.516-520, 1936-07-22 (Released:2011-07-13)

著者

坂市 太郎

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:03694194)

巻号頁・発行日

vol.34, no.403, pp.844-852, 1918-09-22 (Released:2011-07-13)

著者

守田 良太耶

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:03694194)

巻号頁・発行日

vol.52, no.615, pp.450-455, 1936-07-22 (Released:2011-07-13)

著者

上村 敏夫

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.80, no.913, pp.584-590, 1964-07-25 (Released:2011-07-13)

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Due io it's natural conditions the original exploiting features in Akabira Coal Mine were as follows.1. Combination of shaft and belt conveyor.2. Expansion of adjacent area by means of blind inclined shaft system.3. Origination of special car-coupler which can be used for both shaft and inclined shaft.Besides, many preceding technical rationalization and adoption of the new calculating method of stondard amount of labour. Now, we have fully acomplished the rationalization of operation. The present capacity of productioin is 2, 000, 000 tons/year and it's efficiency is 60 tons/head/month.

著者

西島 直己

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:03694194)

巻号頁・発行日

vol.58, no.684, pp.274-275, 1942-04-22 (Released:2011-07-13)

著者

今井 正修 四谷 禎三

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.71, no.806, pp.405-410, 1955-08-25 (Released:2011-07-13)

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Heiwa No.2 Coal Mine was opened in 1947, and begun to operate in August 1954, and now it's production is about 600 t per day of high calorie caking coal. The new epuipments were adopted to this mine, especially the incline haulage by skip-cars is mechanically and electrically going into effect for the consequence of following.1. The Tandem Winding mashines of 2 motors system are equipped with no mechanical connection between 2 drums.2. The railway is a single track, and 2 skip-cars are drived alternately on this railway.3. The measuring conveyor system is used for the loading to the skip-car.4. The heavy type skip-tippler is equipped at slope in 20 degree.5. Winding mashine, loading mashine, skip-cars and skip-tippler are drived all together with automatic control.