Construction of small protective fortification structures – factory-produced cylindrical reinforced concrete dugouts

Abstract

Purpose. Design a dugout made in factory conditions for further implementation in the system of ensuring reliable protection of soldiers in combat conditions, taking into account quick installation and ease of use on the front line. Methods. Analysis and synthesis, generalisation, theory of probability, theory of decision-making. Results. Based on the analysis of foreign experience in the construction of fortifications, the construction of a cylindrical dugout made of reinforced concrete is presented, aimed at reducing the time of their deployment, increasing mobility and strength, ease of manufacture, and the possibility of multiple use in various places of hostilities. Scientific novelty. The structure of the dugout is a reinforced concrete pipe (barrel, container, bunker) with a diameter of 2.5÷3.0 m, a length of 4.0÷6.0 m and a wall thickness of 150÷200 mm with transverse walls at its edges that hold armoured doors . In the cavity of the pipe, a metal frame for fastening the shelves for rest is mounted, which can be turned in the pipe and fixed in the appropriate position using spacer screws. In a similar way, round armoured doors are turned and fixed in the transverse walls, around which 6÷8 holes with a diameter of 120-150 mm are provided for ventilation, lighting and observation. The further direction of the research is the formation of calculated combinations of forces for solving problems of dynamics in time, namely group D1 – calculation for emergency load, explosion, impact, failure of elements when calculating for progressive collapse with the help of LIRA-SAPR software. Practical significance. Implementation of the development results into the system of ensuring reliable protection of soldiers in combat conditions will allow to minimise losses among the military due to the use of reinforced concrete structures of cylindrical shape, manufactured in factory conditions.