What is DT CT on the stairs?
DT: Elevator CT: Cap
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DT represents the upper and lower elevators, CT represents the platform
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the stairs are buildings as a vertical traffic between the floor components. Used for traffic links between floors and large differences. In the multi-storey and high-rise buildings with elevators and escalators as the main vertical means of transport, stairs should also be provided. High-rise buildings, despite the use of elevators as the main vertical means of transport, but still have to keep the stairs for fire when the escape. The stairs consist of successive steps (also known as ladders), platforms (rest platforms) and enclosures. The lowest level of the staircase and the highest level of step-by-step horizontal projection distance for the staircase, the total height of the staircase is high. During the Warring States period, the image of the heavy house on the bronze was engraved with stairs. 15 to 16th century Italy, the indoor staircase from the traditional closed space in the liberation, making it a change in shape with a decorative part of the building.
