Longitudinal avoidance type evacuation platform in rail transit system

The invention provides a longitudinal avoidance type evacuation platform in a rail transit system, and belongs to the technical field of rail transit safety. A steel support is arranged in a station turnout area after a tunnel or a viaduct is finished, the fixed platform plate and the turnover platform plate are laid on the steel support, continuity of an evacuation platform in a rail transit system is achieved, personnel evacuation is facilitated, meanwhile, the turnover platform plate is arranged at the disconnected position of a ballast bed concrete surface, and the turnover platform plate is arranged at the disconnected position of the ballast bed concrete surface. By means of the turnover platform plate, a user can open the broken position of the ballast bed concrete surface through the turnover platform plate, a switch machine installed in the broken position of the ballast bed concrete surface can be conveniently maintained and repaired, in addition, the turnover platform plate is locked through the lo