Reasons for the collapse of ceilings during the construction of monolithic buildings

Abstract

Construction works, as a rule, differ in complexity and hazards of works. Nowadays, cases of collapses of a formwork of the cast concrete section of a building under construction in the course of concreting became frequent. Accidents entail death of people and significant material losses. Purpose of the research: the purpose of the research is to study accidents occurred during installation of in-situ concrete floors of buildings and to reveal the typical causes of a formwork system collapse. The initial materials were the data on the causes of accidents at construction sites obtained on the basis of the analysis of statistical materials on injuries, as well as data on the identified violations of the requirements for safe work practices in capital construction and reconstruction of buildings and structures. A total of 148 accidents at construction sites from 1997 to 2019 were considered. The paper systematizes some main errors and violations of technologies committed in the course of in-situ concrete works. Typical causes common for all formwork collapses during concrete works for in-situ floor slabs installation are revealed. Among the objective causes of accidents and high injury rate in this type of construction works the following should be highlighted: the lack of method statements and construction plans; lack of supervision of the correct and safe execution of works; shortcomings in the organization of training and testing of labor protection knowledge; violation of technological regulations and safety rules.