2011
INTERNATIONAL MINING FORUM 2011
52
Heinz Dwuletzki, Burkhard Pfaender – CARL BECHEM GMBH, HAGEN Germany, Karel Niemczyk, LUBRICANT s.r.o.
Czech Republic
New Fire-resistant Hydraulic Fluids Type HFA for Mining Use – Critical Analysis.
Fire-resistant hydraulic fluids of type HFA form a very important subgroup within the hydraulic fluids H. Both water mixa-
ble species are used for underground mining; type HFA-S (solutions) and type HFA-E (emulsions) are discussed in de-
tail. Test procedures according to various requirements need to be fulfilled: The 7th Luxemburg report (1994) describes
most of the tests followed by the requirements of OE-Manufacturers and end users. Ecological properties and technical
requirements are discussed and compared with the chemical formulation of different species of HFA-fluids.
Marek Płonka, Sylwester Rajwa – Główny Instytut Górnictwa, Katowice, Poland
Assessment of powered support loadings in plow and shearer longwalls in regard
to the pressure measurements in props
The results of static pressure measurements in the space under props pistons of powered support, performed during
mining of seams in five longwalls with roof caving were presented. Measuring systems, and methods of data collection
and storage were characterized. The results of measurements were presented in the form of plots of pressure variations
and the support load-bearing capacity. Sample of statistical analysis of the recorded data were presented.
Dr inż. Zbigniew Rak, Ph.D, Jerzy Stasica, Ph.D. – AGH University of Science and Technology, Krakow, Poland
Maintaining of the tail gate behind the exploitation face in difficult geological and
mining conditions in LW „Bogdanka” mine
The increasing costs of driving longwall headings result in systematic research concerning their maintenance behind the
exploitation face in Polish coal mines. This paper describes the results of such attempts which were undertaken in relati-
vely difficult conditions in LW “Bogdanka” mine in the 80s. of 20th century and - after a long break – in 2010. The article
gives detailed description of the technology designed to protect the tail gate 1/VI in the seam 385/2 maintained behind
the exploitation face in the conditions of LW “Bogdanka” mine. The method of securing the tail gate from the beginning
of its drive until the last reinforcements built-in behind the longwall face. Previous results of the attempts to maintain the
heading in one-sided surrounding of gobs were also described.
GŁUCH Piotr, Ph.D., Silesian University of Technology, Faculty of Mining and Geology, Poland
Design of bolting support for maintenance of longwall headings for plough lon-
gwalls
The article discusses the design of bolting support for the maintenance of longwall headings for plough longwalls when
such factors like: difficult geological and mining conditions, significant depth of exploitation, long panel lengths or the
necessity to keep large corss-section area of the excavation have to be taken into account. In the proposed solutions
attention was paid to use bolting systems with high preliminary tension and support systems with high preliminary sup-
porting capacity. In LW „Bogdanka” mine the heading maintained behind the longwall exploitation face may be used
for storage of gangue and for ventilation purposes as well as for driving new secondary heading for the next longwall.
Independent bolting support may be built in longwall cross-cuts, liquidation or technological drifts.
Mirosław Masiakiewicz – Lubelski Węgiel „Bogdanka” S.A., Poland
Prospects of using the MR 620 roadheader with advanced mechanical bolting system
in the Bogdanka mine
The article presents a new unique solution for the system for driving roadways developed for the conditions existing
in the mine of Lubelski Węgiel “Bogdanka” S.A. The purpose of the presented organisation and technical project is to
increase the progress rate of driving roadways within arch-shaped bolt support. The system will comprise a high power
roadheader, a mechanized platform for installing gallery support frames, and a double boom bolting machine. The new
face system will enable simultaneous performance of certain basic operations of the engineering cycle, such as mining
and bolting, which will bring a significant increase of the driving progress rate. The system involves building a support
system in the face to ensure fast support of the rock mass by means of mechanical lining, using containers filled with a
fast-setting binding material under pressure, and bolting, in order to reinforce the rock mass behind the roadheader.
Abstracts of the conference papers