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Sheet Pile to Existing Concrete Retaining Wall Transition 1

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JoelTXCive

JoelTXCive

Civil/Environmental
Jul 24, 2016
923
Does anyone have a good detail or idea on the easiest way to transition from steel sheet piles to a concrete retaining wall?

Please see below image. We have an existing concrete retaining wall and we are going to be butt-ing up proposed sheet piles to it. The walls are located at the edge of a drainage channel and retain ~10ft of dirt. They permanently have ~8ft of fresh water in front of them.

How can I connect the two?

I'm thinking I can drill & epoxy a vertical angle to the end of the concrete wall. Then, I can bolt or field-weld the sheet pile to the outstanding leg of the angle? (Bolting seems better since I assume the sheet pile wall and concrete will be moving at different rates. I'm thinking the connection needs to be a little loose, but not loose enough that dirt leaks. We could put filter fabric on the back side.

What do you think?

Thank you,
Joel

Plan_View_Ret_Wall_oduwjw.jpg
 
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use horizontal HP steel beam welded from Sheet-piles side to the side of RC wall, concrete wall could be drilled and anchorage threaded Bars (equally spaced horizontal @ 20-24")
 
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Cut a sheet pile, saving the interlock and some flange. Using a diver, bolt the cut sheet pile to the concrete wall. Drive remaining sheet piles starting at the bolted-on, partial, sheet pile.

 
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PEinc: I heard from CMs that they have seen crack and separation at the sheet pile to concrete connection. Their observations were that it was caused by deflection compatibility issues ie the sheet piles moves more than the concrete. I never saw any photos but I tend to believe them. Either way I have avoided bolted connection but I could see it working well. Maybe oversize the connection holes and use washer plates. Thoughts?
 
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So what did the CM's expect when connecting a flexible SSP wall to a rigid concrete wall? Maybe use one or more extra-stiff SSP doubles coming off the bolted connection.

 
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Their advice was to not rigidly connection cantilever SSP to concrete so expansion joint as I had shown. Other approaches were king piles at the concrete wall (a la what you said about stiff SSP), use tiebacks at the SSP near the concrete, or concrete mat on the exposed face of the SSP to limit the length of the SSP (special circumstances needed for this to work like no dredging, etc.).

I was just curious about your experience. A simple bolted connection is definitely more cost effective. It could work if SSP deflection is low or you have a slip joint of some kind.
 
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