Work at Height

The double alpine butterfly is safe enough clipping cowstail even if one of the loops is damaged

Poškození oka horolezeckého motýlka a jeho vliv na bezpečnost lezce: poznatky z testů

Článek přehledně analyzuje výsledky testů poškozených ok horolezeckého motýlka provedených v roce 2021 a hodnotí, zda lze takto poškozené oko bezpečně použít k zajištění lezce při překonávání uzlu. Zjištění ukazují, že samotné uvázání uzlu snižuje pevnost lana více než provozní poškození. Největší vliv na pevnost má poškození ve vrcholu oka, přesto i poškozené oko často splňuje normové požadavky některých osobních ochranných prostředků.

Průběh experimentu - zavěšení figuríny

The risks related with fall arrest

The article deals with the issue of injury risks arising from fall arrest in a harness when working at heights. It analyses the forces impacting on the human’s body when a fall is arrested in a full-body harness and the acceleration of the head. It points out that rather than relying on fall arrest system, it is more advantageous to prevent a fall altogether, for example by using a work positioning system.

Falls from a height and their sorting in terms of risk prevention

The article deals with the issue of falls from a height. It defines basic terms such as fall, fall distance, fall from a height and into depth and fall clearance. It provides basic information on the mechanics and consequences of a fall. It explains the sorting of falls according to biomechanics, to the OSRI (VÚBP), to the consequences of a fall and to the OHS risk prevention. These are sorted into completed falls, incomplete (arrested) falls and pendulum falls, including subgroups.

Pohľad na polohu modelu tela poškodenej na začiatku simulácie sprava (vľavo) a spredu (vpravo)

Issue of falling of a human subject from height with emphasis on railing height

The presented paper describes a forensic biomechanical reconstruction of a human fall from a hotel balcony, with special emphasis on the effect of railing height. The reconstruction integrates methods from forensic engineering, criminal science, biomechanics, numerical simulation, and 3D documentation. By using a multibody simulation in PC-Crash combined with a metrically accurate 3D model of the scene derived from a point cloud, the study enables an objective, quantitative evaluation of the incident dynamics. The paper compares the reconstructed fall trajectory with legislative standards for railing height, highlighting potential safety deficiencies. The findings demonstrate how scientifically based numerical reconstruction can support expert opinions in legal proceedings and contribute to the design of preventive measures in construction, thereby reducing the risk of human falls from height due to insufficient structural design of building elements.

Strength tests of the Polish knot

Although the Polish knot is often used for anchoring in rope access, rope rescue and caving due to its advantages, there is a lack of information about its strength. The article deals with the strength and efficiency of the Polish knot, both when loading the front and rear strands of the rope coming out of the knot. It shows that the difference between the individual strands is insignificant. And although the Polish knot shows lower strength than the figure-eight loop, it offers other advantages.

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