Caisson Design Standards/ Guidelines for Sinking Procedure
Caisson Design Standards/ Guidelines for Sinking Procedure
(OP)
I am looking for a good reference or design standards for circular caisson reinforcement and sinking procedures. Specifically looking for guidelines for prevention of tipping during the sinking sequence.
Wanting to sink a 30 ft diameter concrete caisson to approximately 90 ft, but there is a possiblity of an unbalanced load, which could lead to excessive tipping and possibly create a dangerous situation if not prevented or mitigated.
Any suggestions?
Wanting to sink a 30 ft diameter concrete caisson to approximately 90 ft, but there is a possiblity of an unbalanced load, which could lead to excessive tipping and possibly create a dangerous situation if not prevented or mitigated.
Any suggestions?





RE: Caisson Design Standards/ Guidelines for Sinking Procedure
I will check my bookshelf tonight to see if there is anything useful.
Are you precasting sections or casting in situ as you sink? It will depend on the soil conditions but in general I would suggest sinking in 3m lifts.
Are you using bentonite against the excavation face? It all depends on the soils but probably you will need a cutting shoe at the base which is thicker than the shaft wall. Then you can fill the anulus with bentonite to help overcome the friction.
Why do you think there is a danger of tipping. If you keep to 3m lifts and use a guide ring at the surface there shouldn't be a problem.
RE: Caisson Design Standards/ Guidelines for Sinking Procedure
This is my first caisson sinking project so I have be doing quite a bit of research and looking at case studies. I was told about a project similar to this where the caisson tilted just above the clay layer. Apparently the sand on one side flowed under the cutting edge causing the caisson to tip.
We are working with an experienced contractor, but I would like to find some good references on procedure so I am aware of these potential problems.
RE: Caisson Design Standards/ Guidelines for Sinking Procedure
RE: Caisson Design Standards/ Guidelines for Sinking Procedure
RE: Caisson Design Standards/ Guidelines for Sinking Procedure