This raft is mainly used in areas of either mining activity or soft alluvial deposits where a stiffened beam is required on the main load lines. The tying of the ground ﬂoor slab into the beams prevents lateral distortions of the beam and evens out any local differential settlements. This type of raft is more economic than the cellular form and is used where conditions are not as severe.
Fig. 9.28 Beam strip raft.