This architectural drawing is Construction detail of tunnel with detailing. The cutting can be done by two methods. One is bottom up method in which a tunnel is excavated under the surface using ground support. Another method is top-down method in which side support walls are constructed first by slurry walling method or contiguous bored piling. There are three basic types of tunnel construction in common use: Cut-and-cover tunnel, constructed in a shallow trench and then covered over. Bored tunnel, constructed in situ, without removing the ground above. Immersed tube tunnel, sunk into a body of water and laid on or buried just under its bed. For more details and information download the drawing file
