Abstract: In current studies, scholars usually only consider a single constraint condition of shortest path in the research of fire path planning, and do not consider the impact of multiple constraints on path query, which brings some limitations to the evacuation. This paper will study the indoor fire path query method based on a variety of constraints, that is, integrating distance constraints, number constraints of fire-fighting facilities and number constraints of dangerous areas. Extract the data and fire information in the indoor mixed road network through BIM technology, and build the comprehensive fire road network data; then through the design function, adjust the coefficients in the function, determine the fire comprehensive road network under the specific multiple constraints, and then call the Dijkstra algorithm to generate K paths satisfying multiple constraints, and provide more path selection for evacuation, so that the fire path is more humane and personalized. Finally, the feasibility and practicability of the proposed method are verified by experiments and three-dimensional display.

Key words: fire safety; BIM technology; evacuation; multiple constraints; path query