Figure 3 - uploaded by Vladimir Čebašek
Content may be subject to copyright.
Schematic representation of the wedge and its position while testing specific cut resistance in the primary method
Source publication
Lack of geomechanical parameters for the digging force in underwater mining conditions was noticed during analyzing the available technical documentation at preparatory phase for the revitalization of the vessel bucket wheel excavator "Kovin" vital parts. This fact has caused the need for the implementation of relevant research program that will de...
Contexts in source publication
Context 1
... this purpose we used specially designed wedge that was used for wedging the coal specimens. The wedge has lateral sides slopes of 17 o to the longitudinal axis, a blunter tip of width b = 5 mm and the wedge length l = 65 mm, figure 3. At the original method the wedge for testing is being installed into a suitable hydraulic press which is used for vertical force applying. ...
Context 2
... same pressure conditions are required for performing the digging force test in defined terms. In existing triaxial cell for the maximum specimen diameter of d = 150 mm is additionally installed wedge for digging force testing according to the method that has been proposed by the company Orenstein und Koppel, in Figure 3. The appearance of modified testing equipment is shown in Figure 7. Figure 6. ...
Citations
In May 2019 the Thyssen Schachtbau GmbH was commissioned to construct two shafts (DN = 3.50 m, depth = 122 m and 106 m) in a limestone quarry for a TITAN Cement Group in Serbia. The raise-boring method was used for shaft construction, excavated material removed by LHD. After completion of the excavation, a hoisting system was installed, consisting of a shaft frame, main winch for the working platform and an emergency winch with emergency cage. In the first step the hoisting system was required to install the temporary rock support (top down), later to install the final shaft lining (bottom up) in form of steel tube lining in the lower, concrete lining in the upper part. A base ring in the tunnel provided a foundation for the shaft lining. The hoisting equipment was certified on the basis of the Serbian regulations in line with the German and European regulations. The Serbian HSEQ requirements, specifications of the international client and internal guidelines had to be taken into account in order to implement the project in a solution-oriented and thus successful manner. Training of Serbian specialist personnel and local subcontractors for working in the shaft was an additional success for the project.
55 INTRODUCTION e cement marls deposit "Filijala" is the main source of the basic raw material for the cement factory today. It has been known since 1838, and its exploitation works began in 1869 where the open-pit mine "Filijala" was developed. is deposit consists of three mining areas of unequal size and degree of exploitation called: "Severno polje", "Srednje polje" or "Međupolje" i "Južno polje"(Ganić M. et al., 2012). The cement marl basic technology of exp-loatation is continuous with the use of a bucket wheel excavator. Due to the conditions in the deposit, especially due to the quality of marl, it is not possible to apply exclusively continuous technology, so the discountinu-ous exploitation technology is used as well. Discontinuous technology is used for the exploitation in parts of deposits where the bucket wheel excavator can't operate, as well as for simultaneous excavation from both technologies in order to homogenize the quality of the Abstract: Since 1976 cement marl excavation at open-pit mine "Filijala" is carried out by continuous exploitation technology using bucket wheel excavator SH 400 manufactured by Orenstein und Koppel (O & K) company. Due to the bucket wheel excavator time-worn and high operating cost it was necessary to replace it with new one. In order to test the new bucket wheel excavator and prove its capacity a testing zone was defined as test block for excavation, in which the bucket wheel excavator testing will be conducted. In the test block area detailed investigations were carried out which included laboratory testing in order to determine the value of material cutting resistance.
