Pile and Lagging Walls
Pile and Lagging Walls
(OP)
I am looking for any references for the design of pile and lagging walls.
We are doing preliminary estimating for a project that involves a cut retaining wall to support poor quality native limestone (RQD = 0 -5). The cut structure will be just a few feet of of the property line, thus our first thought is a pile and lagging wall would be the best option.
We will be supporting limestone, with piles embedded in the smae limestone. Wall forces should not be that great, but weathering and deterioration of a cut face is the main concern.
Any ideas or references for rough design?
Thanks
We are doing preliminary estimating for a project that involves a cut retaining wall to support poor quality native limestone (RQD = 0 -5). The cut structure will be just a few feet of of the property line, thus our first thought is a pile and lagging wall would be the best option.
We will be supporting limestone, with piles embedded in the smae limestone. Wall forces should not be that great, but weathering and deterioration of a cut face is the main concern.
Any ideas or references for rough design?
Thanks





RE: Pile and Lagging Walls
Good luck.
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Pile and Lagging Walls
RE: Pile and Lagging Walls
Thanks for the input. I agree with your comments. We will not be providing a design for this wall at this time - only providing rough feasability info to the client. As such we are just trying to get a grip on some ball park costs that might be associated with this structure. If these costs look o.k., the client will release us to put the "expert eyes" onsite and provide a detailed design.
Gpave, you mentioned a potentially cheaper alternative? I'd welcome your thoughts along that line. Our main constraint is the location of the wall & property line. Our wall is a cut, located approx. 5' from the property line. This eliminated MSE, and tieback walls, which are our usual preference from a cost standpoint.
Thanks for your help!
RE: Pile and Lagging Walls
RE: Pile and Lagging Walls
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Pile and Lagging Walls
RE: Pile and Lagging Walls
The potential problem that I see with your situation is that you face to unappealing choices. First you provide a high estimate to stabilize the cut, you protect your self from being low, but in the process you price the project out of economic viability. The second is that you provide a best guess, the actual cost is much greater and the client is mad at you for being wrong.
This is the problem with providing estimates when not enough is know about the situation prior to making the estimate. Depending on your relationship with the client you may be able to sit down with them and discuss the problem and either get the go ahead to do more engineering on the potential solutions or they may just want the worst case.
RE: Pile and Lagging Walls
Depending on the height of your cut and space constraints, you may want to consider the use of a gabion basket retaining structure. These systems can be very cost effective in cut situations.