Prefabricated helical escape structure for multiple storey buildings - is formed of concrete modules on steel supports with entrances on slide round central chimney

摘要

The structure is formed mainly of a plurality of prefabricated sections of precast concrete. Two identical upper sectional units and two identical lower units are arranged facing each other for each floor of the building. Complementary portions of the assembled units form opposite entrances on each floor leading to helical slides arranged about a central circular chimney. The units are provided with steel members which are connected together and secured to a steel framework. Additional chimneys within the corners of the units may be used as shoe drops.