Experimental investigation of the technical characteristics of the ventilation duct fragment of the exhaust smoke ventilation system of the construction version of transport tunnels structurally combined with a deformation seam

The article presents the problems of engineering systems that ensure fire safety in transport tunnels, in particular smoke ventilation systems. Taking into account the peculiarities of the architectural and structural design, transport tunnels are a source of increased threat to human life and health in the case of fire. At the same time, the efficiency of smoke ventilation systems directly depends on the design of the components and assemblies of these systems (fans of supply and exhaust systems, ventilation ducts, fire valves, etc.), as well as on their interaction with each other.

Also, the article considers the need to study the behavior of duct structures of exhaust smoke ventilation systems in construction used in transport tunnels, their compliance with the requirements of regulatory documents. The relevance of the article is that the problem of the technical design of ventilation ducts of construction design in road tunnels has not been studied properly, which may adversely affect the functioning of smoke ventilation systems in general.

In addition, the article provides an analysis of an experimental study of a ventilation duct fragment of a construction version of an exhaust smoke ventilation system of a construction version of transport tunnels structurally combined with a deformation seam (hereinafter referred to as a fragment of a ventilation duct with a deformation seam). The dictating characteristic during the experiment was the tightness of the sample, characterized by the tightness class “B” according to SP 7.13130.2013. The test sample was mounted on a special stand, in accordance with the established technical characteristics. During the experiment the sample was subjected to a double effect: the creation of a temperature test bench in the fire chamber according to GOST 30247.1; creating the maximum possible pressure drop on the sample. During the experiment, the maximum condition of the sample for tightness was reached at 45 minutes. The obtained results of the experiment indicate that there is a further need to study the behavior of ventilation duct structures of construction design in a tunnel ventilation system under thermal influence, in order to increase their fire-technical characteristics and to improve the efficiency of smoke ventilation systems as a whole.