Concrete thickness of basement floor: the mystery of elevator, civil air defense and overall planning

The concrete thickness of basement floor is an important problem in basement construction, which is related to the normal operation and safety of elevators, as well as to the decoration and use of basements. This paper will reveal the related problems of concrete thickness of basement floor from three aspects: elevator room, civil air defense area and overall planning.

elevator shaft

In order to ensure the normal operation and safety of the elevator, the depth of the elevator foundation pit must not be less than1.75m.. At the same time, in order to facilitate the decoration, the concrete thickness of the basement floor should be controlled within a reasonable range to ensure that the basement floor will not be higher than the floor outside the elevator room and the floor of the computer room.

Civil air defense zone

According to the height of explosion-proof floor drain and threshold, the basement floor of civil air defense door should keep a certain distance from the civil air defense threshold. Fully enclosed civil air defense door, the basement floor is lower than the civil air defense threshold150 mm. The concrete surface at the threshold of other types of civil air defense doors shall not exceed the top of the threshold.

Macro layout

First determine the thickness of the lowest point, and then find the slope according to the demand. Ensure that the average thickness of concrete is about 100mm, and adjust the local thickness flexibly according to the actual situation.