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  • Author: Marek Kalita x
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The following stages of a designing process of the toothed haulage segment are presented in the article. The toothed segment, developed within the framework of the KOMTRACK project, is an element of an innovative haulage system for highly productive longwall complexes. The project, according to the Contract No. POIR.04.01.04-00-0068/17, realized by the consortium: KOMAG, AGH University of Science and Technology, Foundry Institute, Specodlew Innovative Enterprise of Foundry Engineering, Ltd. and Polish Mining Group, J.S.C., is co-financed with the means of the European Regional Development Fund. The toothed bar, made of toothed segments of the haulage system, works together with the track wheel of a shearer haulage unit. A distinguishing feature of the newly designed haulage system, in relation to the system used at present, is its flexibility enabling individual toothed segments to adapt to longitudinal and transverse curvatures of the longwall conveyor track, which guarantees a correct cooperation with the track wheel.


The method of unconventional solid rock loosening with undercutting anchors and the literature analysis of the problem are presented. The tests and test results of the rocks loosening process with a fixed undercutting anchor are described. The tests were carried out within the RODEST project, OPUS 10 competition No. 2015/19/B/ST10/02817, financed by the National Science Centre. Numerical modeling process as well as a series of laboratory and in situ tests were carried out. The test stand equipment and methodology for the in situ tests are presented. The tests were conducted in four mines, which allowed to obtain and determine the following characteristics:

  1. loosening force as a function of anchoring depth (for a given type of rock),
  2. the range of rock loosening in a function of anchoring depth (for a given type of rock), and
  3. loosened rock volume as a function of anchoring depth (for a given type of rock).

The in situ test results are compared with the concrete capacity design (CCD) model used for the calculation of anchor load capacity in concrete.