Street bubbles/balloons

Street bubbles/balloons 

The street bubble design is going to work as the fire escape/ street entranceway to the underground. Each of them will work as the stairwell and also something else such as a bike storage area.

Drawing of the ideas 

Spider diagram showing what else it could be used for

3D view, sections, and plans of my bubble designs.

The images which helped me to come up with the idea