Looking for a ratio of internal vs external frictional capacity of driven pipe piles in a layered sand and clay. FHWA's Driven Pile Foundations has a blurb recommending 1/3 to 1/2 of the external capacity when a plug is not formed.
Thank you for your response, a test lift is a very good idea and can be built into the construction contract. upon a safe lift of maximum service load the crane can be checked for level and shimmed if needed.
The fill materials are known as "select fill", the exact gradation can vary...
The crane is actually set to sit on a group of footings on top of a frame (permanent structure), the frame will be shimed level before the crane is used. Most of the predicted settlement will occur before the crane is used (about 80% of it), the actual service loads that the crane will hoist are...
We are in the process of designing a crane footing (10ft. square)on controlled fill (20 ft of fill with footing embedment of 5 to 10ft). My primary concern is settlement since the applied loads are in the range of 2 tsf and bearing should not be an issue. I ran an analysis assuming a sandy soil...
