Raise boring equipment TON Mining and Rock
methods Pilot drilling Conventional raise boring begins with the drilling of a pilot hole. It is drilled using a roller bit with sealed bearings, together with hollow drill for the raise borer’s transport, drill string handling and rod changing are the greatest non-productive aspects of raise boring, and have also traditionally been the Raise boring slots: a modern mining technique
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Considerations for large-diameter raiseboring
Raiseboring is a method to develop vertical openings using a drilling machine from an upper level. It requires access to a top location (either surface or underground) and a bottom 2 天之前Epiroc’s range of raise boring machines includes models for both conventional raise and boxhole boring as well as down reaming and it covers diameters from 0,5 Raise Boring Rigs Raise Boring Drilling and Mining
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Empirical Performance Prediction for Raise Boring Machines
The flexibility in different angles//gradients//inclinations (from horizontal to vertical) and diameters (up to around 6–7 m) is a great advantage of the raise boring Diameter. 0.3–8m. The Herrenknecht Raise Boring Rig: Powerfull technology for shafts with depths of up to 2,000 meters. The Raise Boring Rig (RBR) developed by Herrenknecht is Raise Boring Rig (RBR) Herrenknecht AG
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Raise bored slot raises: A modern mining technique
Figure 1. Two slot raises in one stope. Slot raises refer to relief holes within a stope, intended to provide void space (or burn-cuts) for blasting, thereby allow PDF This study presents the concept of shaft constructed by raise boring in underground mines, and the idea of inverse construction can be extended to Find, read and cite all the research...Key technologies of drilling process with raise
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Raise boring slots: a modern mining technique
the highly mobile RHINO 100HM raise borer took over in July 2014, and the conventional long-hole top-hammer drill rigs were assigned to other tasks. The RHINO 100HM raise borer includes a comfortable, safe, quiet and ergonomic operating cabin. To further assist the operator, the most advanced controls are installed:The second case history deals with the failure of raise borer drill rods. Although reamer stems and stabilisers fail occasionally, drill pipe failures are rarely experienced. During 1976 a number of drill rod failures were experienced both in R.S.A. and elsewhere, which led to a series of investigations.METALLURGICAL FAILURES IN THE MINING INDUSTRY
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Raise bored slot raises: A modern mining technique
Mobile raise borer produced 100 raises and 2329 meters during 15 months in the WA mine site1. Rhino 100 production will be more than 5000 meters in that same mine in the same period2. Figure 5. Rhino 100 changing drill sites in Western Australia. Slot drilling operation Conventional raise borer Mobile raise 2 borer1 Rhino 100 Highly mobileCannon 31R raise drill was used for drilling a 17 Calweld-Smith Company introduced the first blind hole or box-hole raise borer in about 1967. In this machine rotational and thrust forces for the cutterhead provided via the drill string through the power unit located in the mine floor at the foot of raise. Robbins designed their 81R machineSome contributions on the estimation of performance and
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Raise boring equipment TON Mining and Rock
blind boring. It drills the pilot hole and reams out the raise at the same time. The head is rotated and pushed upward. The cuttings fall out of the hole by gravity. Normal blind raise diameters are from 0.6 to 1.8 m. Since the drill string is under compression during blind boring, special large-diameter stabilizers are needed to support The Agnico Eagle Kittilä goldmine, a two-hour ride north of the Arctic circle in Finnish Lapland, is a 4,000-tonne-per-day operation that expects to produce around 200,000 ounces of gold in 2016. It uses the Rhino 100HM raise borer for slot hole drilling in production and also for drilling shafts for the mine infrastructure.Borers: raising the game Engineer Live
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Drilling Enhances Shaft Safety E & MJ
Shaft-boring Systems. In addition to its three-model raise-borer range, Herrenknecht offers two types of shaft-boring machines, a shaft-drilling jumbo and a box-hole boring machine. The TY shaft borer drills up to 2,000 m into hard rock, and is capable of creating shaft diameters of 10 m–12 m. Its cutting wheel also acts as a means ofchallenge is to make raise boring an appealing alternative. “To utilise the benefits of conventional raise boring while also addressing the drawbacks, it soon became obvious that an entirely new type of highly mobile, self-contained raise borer for underground produc-tion drilling had to be built,” notes Salo. This new unit had to include18 UNDERGROUND DRILLING RHINO raise boring
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Empirical Performance Prediction for Raise Boring Machines
The basic aim of this study is to develop empirical models for predicting performances of pilot hole drilling and reaming for raise boring operations using rock properties and pilot hole drilling operational parameters for classified raise inclinations [vertical (90°) and inclined (70°)] that could be used in feasibility and operational stages This mean, indentation index test may be used to calculate penetration and thrust force of raise boring machines. The measured penetration rate in field was 2.21 mm/rev. The later value based on indentation experiment was estimated as 1.29 mm/rev. The net thrust was measured as 1312 kN and estimated value as 1017 kN.Predicting Performance of Raise Boring Machines Using
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Raise Boring Rigs Raise Boring Drilling and Mining
2 天之前Epiroc’s range of raise boring machines includes models for both conventional raise and boxhole boring as well as down reaming and it covers diameters from 0,5 meters up to over 6 meters. The boring drills are used in both civil engineering and mining applications for drilling shafts for ventilation, drainage, ore passes, back fills, hoistingThis research evaluates the chief shaft in the Azad Dam hydroelectric power plant in Iran using a raise borer machine (RBM). Core samples were taken from the exploratory boreholes of the 210-m-long pressurized shaft. This study aims to determine new experimental models using linear and nonlinear regression approaches to estimate An Efficient Experimental Model to Estimate the
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Key technologies of drilling process with raise boring method
The raise boring method is a construction process to excavate shafts by bottom-up reaming the pilot hole using drill rigs (Liu & Meng, 2015), which mainly includes two operational stages (see FigRaise borer were first introduced in mines of western countries in 1962, and at present 300 raise borer are in use throughout the world. The method of raise drilling consists essentially of drilling a pilot hole,230 mm to 300 mm diameter, between two levels at the site of and in direction of the proposed raise. made of round steel SpecialRaise Boring In Underground excavation PDF SlideShare
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Handling the blockades while excavating the surge shaft at
With raise borer, a 280 mm diameter pilot hole was drilled from top to entire depth of 164 m. During drilling of this hole, substantial water loss was observed at four locations and this was tackled by cement grouting. Thereafter, reaming of 280 mm hole to 1.8 m diameter pilot shaft was done from bottom to top (Goyal and Khazanchi, 2003).Fig. 2-Raise-drill diameter and depth capacities An early concept in raise drilling is the pilot-hole 'up drilling-down reaming' method shown in Fig. 5. This method employs all the same components as those used by the standard raise drill. All the drilling forces are transmitted through the drill string. This feature has been offered as anRaise and shaft drilling, a continuing development
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5m long drill steel drilling a 23m deep hole in order to
5m long drill steel drilling a 23m deep hole in order to achieve a 20m advance from MINING 1008 at University of South Africa. Upload to Study. Expert Help. Study Resources. Log in Join. 5m long drill steel drilling a 23m deep hole in order. Doc Preview. Pages 100+ Total views 25.It can comfortably execute raises of up to 500 m at 2.4 m diameter and larger ones up to 4.1 m diameter (of shorter depths). It has a maximum pilot drilling torque of 42,000 Nm, a reaming torque of up to 209,000 Nm and breakout to 236,000 Nm. The maximum down thrust force is 665 kN with up thrust being 4,150 kN.The Raiseboring Revolution E & MJ
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