Berlin wall
SEFI-INTRAFOR
used for excavations in urban areas.
The method consists of :
Drilling regularly spaced boreholes in which metal beams are sunk
Installing cladding (wood, shotcrete, steel plates) between the beams as the excavation
progresses
The stability of the retaining wall is temporarily provided by struts or anchors except in shallow
excavations where the wall may be self-supporting.
