Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie Number 12/2007

The article is a continuation of the series of publications on hygiene at work in mining. It presents the analysis of incidence of occupational diseases in Poland and in mining in 2006. The analysis comprises the structure of incidence in national economy as well as in the individual branches of mining. The assessment of development of hygiene at work in mining is also presented.

The interpretation of the results of predicting surface deformations, caused by underground mining i.e. the assessment of the threat to the area and objects on the surface, depends (among others) on reliable imaging of these results on situation-height maps. Such images are usually made with SURFER programme (by Golden Software Inc.), processing the forecast results in GRID/Data segment. The most important in the processing results is choosing the proper method of the interpolation (gridding) of the values of deformation indexes from the set making a forecast result and the establishment of a proper grid, where the interpolation is carried out. The conducted studies showed that the best results can be obtained by the following methods of gridding: Kriging, Shepard’s Method and Radial Basic Function. Too dense grid makes unfavourable waving of isolines showing deformation indexes. Dilution of the grid makes isolines similar to the lines consisted of straight sections.

Emission of mechanical and aerodynamic noise that is produced by drilling rigs accompanies oil drilling. The article presents the noise density distribution in the surrounding environment of the drilling rig. The density values were obtained through measurements carried out according to the suitable procedure, then they were compared with admissible values. Measurement and calculation results, on the basis of the mathematical model of spatial noise exposition level distribution and a programme pointing the safe zones in the surrounding area, were presented in the form of maps referring to the examined area. Taking into account the technical development and the application of measures decreasing noise in the design of drilling rig, one may conclude that the hazard resulting from the noise emission should be considerably reduced, particularly at the source.

The article acquaintances with current technologies of shotcrete used in construction and mining in the world. It shows recent experiences from that field and broad possibilities of use of the discussed technology. It reveals new trends in use of dry and wet methods of spray with concrete. The article also presents the most recent devices for spray with concrete that make the technology more efficient, safe and friendly for the environment

Wet-bulb globe temperature (WBGT) index is a function of four factors affecting environmental heat stress: dry-bulb temperature Ta, wet-bulb temperature Tm, radiant temperature Tr and velocity of air va. This index combines in enclosed environment the measurement of two parameters, natural wet-bulb temperature and the globe temperature. Several mathematical formulas are available for predicting WBGT from the environmental factors. W.Turkiewicz (1986) recommended a new one, which called temperature conform of climate TZK: TZK = 0.6Tm + 0.4Ta – va. Unfortunately, values of TZK are unequal WBGT for the same environment parameters. In comparison with C.D.Sullivan & R.L.Gorton’s (1976) formula TZK get values smaller than WBGT. It is known that WBGT is not extremely sensitive to air velocity and that sensitivity decays at higher velocities. For the same environmental parameters be obtained the value of TZK which is references for high metabolic rate and the value of WBGT which is proper for moderate or low metabolic.

The article presents the technical possibilities in the field of applied equipment of the high voltage electroenergetic system that allows for considerable improvement of system operation comfort and of economic effects of its exploitation with simultaneous safety improvement

Roman Riger (1870 -1947) discovered in 1905 a vibrating chute leaning on rollers rolling on a road floor. It was a first in the world mining device enabling mechanical supply of mined rock from lower faces. This epoque – making discovery of Polish mining engineer was patented in 1908 – 1909 by Emperor - Royal Patent Office in Vienna, Royal Patent Office in Brussels, Emperor – Royal Patent Office in Bucharest as well as by Royal Patent Office in London. The chute based on the idea of Riger found recognition in the world mining and was used in mining plants for 50 years.