Analysis of requirements correctness and methods for testing of block pulley used in systems of individual protection against falling from height in construction industry

Introduction. According to the Ministry of Labour and Social Protection of the Russian Federation, annually for the period from 2018 to 2022 in the organizations out of the total number of accidents with severe consequences, the share of accidents as a result of falling at height and depth differences was 23 %. The main reasons for this are non-compliance with the rules on labour protection when working at height, falling objects from height, conscious non-use of personal protective equipment (PPE) against falls from height, violation of work techniques at height, misuse of PPE or improper use of components of safety systems, lack of collective protection equipment (guardrails, safety catch nets).

Purpose. Increase of safety during rescue and evacuation measures of the victim, who is suspended after a fall, in the means of personal protection against falls from height.

Objectives. 1. To consider the process of the block pulley certification for compliance with the requirements of TR CU 019/2011, the requirements and methods used in the verification of the block pulley. 2. To analyze the correctness of the block pulley certification when using standards to verify the quality of the product. 3. To determine the safety margin, dynamic characteristics of the block pulley by experimentation. 4. To determine the necessary requirements for the block pulley and develop methods of testing the product to introduce another class of product in GOST EN 1496–2020.

Analytical part. The paper analyses the group of standards according to which rescue and evacuation devices are certified in the Customs Union countries. The paper also considers the European experience of certification and verification of technical requirements for the block pulley.
The standards used to verify the technical requirements of TR CU 019/2011 to identify deficiencies and correctness of methods were analyzed.
The authors conducted research tests of the block pulley for various characteristics with the subsequent development of requirements and test methods for these devices.

Conclusions. In the course of the work the criteria of requirements with regard to the characteristics of the block pulley and the methods of testing dynamic and static strength were developed. Functionality check of the free end of the rope used in the block pulley was realized. A term defining a block pulley used in rescue and evacuation and positioning systems was proposed.

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