Hapa mambo ni MATATU
1. Excavate deeper to stable ground
2. Suspend the whole structure with columns
3. Do a raft foundation.
Structural Engineer kama hakufika site kufanya trial pits before aanze foundation design, redesign lazima ifanywe ama nyumba iketi.
Contractor kama hakuquote vizuri for substructure works, he'll see bad things unless a-raise variation order na client akubali kulipa.
Client kama alikuwa anawork na a very tight budget, mjengo inastall kwa foundation phase.
Final Thought:
Always do a site previsit before the designs are done.
@briankaligaye@cenas_j Maybe it's easier and cheaper to dig for columns that it it's fir the whole foundation. Surely there must be a hard layer somewhere, how much of excavation is what governs whether to give all in or just columns.
@Andrew02571145@akibaru@ignyharaz2 You'd need a around a 12 M long 12∅ rebar, plus a a few 8∅ links, plus concrete that's composed of cement, aggregates na cement. So it's quite costly already, then think of labour which includes excavating, making of pad foundations na hizo zote. So kitu kama upwards of 4k