Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie Number 12/2019

Presented in the article solution of the problem of the actual driving forces test in the shaft hoist is a method of accelerometric testing of these forces based on the assumption that the weight of a gin tub in the driving forces is a parameter dependent on the frequency of horizontal acceleration measured at the gin tub. For this reason essence of this method is to convert gin tub acceleration into driving forces taking into account the frequency of acceleration. Thus, the driving forces test rule allows the determination of real driving forces with an error not exceeding 12%. On the basis of the test results it has been stated, that perforations of the upper walls of the expander byatt in shaft V haven’t significant impact on the safety of the tracing tracks of gin tub in the shaft. In the case of slider walls and byatt wear equal to 50% of the initial thickness of their web the smallest excess of the calculated value of the tracing tracks safety factor of the testing shaft, in relations to the required value of this factor is approximately 67%. This statement indicated that with the current technical condition of the byatts and sliders of the shaft V there is possible to maintain the required safety of the track gin tub during the renovation of the reinforcement with the increased wear of byatts and sliders greatest then 50%.

The finishing of mining operations is regulated by two different instruments. In the final operation plan, the mining contractor must present all measures to close operations, eliminate mining hazards and submit them to the relevant mining authority for testing and approval. The end of the mining supervision, on the other hand, occurs by law, if the necessary conditions are met. The mining authority has to examine and establish this. In the article is given an overview of the procedures, explained by examples.

In mines, rescue operations are often performed in excavations filled with smoke and with the use of breathing apparatus. Such excavations may only be entered when rescue lines are used, while any activities connected with rescue line fastening should be performed quickly and effectively to avoid the separation of the rescue team. In 2018, tests involving rescue lines were performed at the Bytom – Zabrze District Mine Rescue Station. The objective of the tests was to determine the time required to fasten and detach such lines and to determine how rescue teams move in the W-70 breathing apparatus both in test chamber excavations filled with smoke and in such excavations without smoke. Three rescue teams from three mines participated in the tests. Three types of rescue lines were used: a reflective one with a length of 10 m, of GL087 Protekt type with a length of 8.5 m, and a line with fastening hooks 5.5 m long. During the tests, the rescuers performed exercises in three stages, in different and specific places of the test chamber. All stages involved the time required to perform exercises by individual rescue teams. The tests revealed that each line was successful in its purpose.  At any stage rescue teams did not separate and the line did not detach accidentally. Nevertheless, all exercise stages were completed the fastest with a 5.5 metre rescue line with fastening hooks.