For an existing 50 year old 6" diameter cast iron drain pipe suspended at 5 foot centres from a structural slab above, how should the force on the hangers due to the soil on top of the pipe be calculated? The soil above the pipe is fill underlain by sandy silt till of 12 blows per foot. The soil below the pipe is also sandy silt till of 12 blows per foot, but vastly improves at several feet below the pipe to 60 blows per foot. I am estimating because the nearest borehole (done in 1965) was 50 feet away from the location I am currently interested in. The situation of suspending a pipe below a structural basement floor (the floor is supported on drilled piers down to good soil) is fairly common, so there must be an accepted way of calculating the hanger load, but so far I have not found it. Perhaps there are tables for different soil conditions that give the hanger load. Any geotechnicalengineers who can help me?
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