Belled Caisson Construction
Belled Caisson Construction
(OP)
For belled, end bearing caissons, I am interested in obtaining opinions concerning the taper angle from the shaft (at the top a of bell reamed at the base of a pile boring) to the bottom (bearing surface)of the bell. The soils of interest are clays and clay tills with working end bearing capacities of 200 to 500 kPa. I have seen various structural details showing differing tapers. Belling tools used by most local contractors will produce a taper of about 1V:1H to 1.5V:1H when the wings are fully extended.





RE: Belled Caisson Construction
RE: Belled Caisson Construction
RE: Belled Caisson Construction
In my practice, I recommend a maximum 45 degree angle (usually 3:1 bell:shaft ratio) unless I am concerned about the bell collapsing. Under those circumstances, I will limit the bell to a 60 degree angle - or recommend the use of straight shafts.
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Belled Caisson Construction
RE: Belled Caisson Construction