Jack and Bore
Jack and Bore
(OP)
Does any have experience with jack and bore in very loose sandy soils, or have any good reference to jack and bore construction? This is in relation to jack and bore of a 42" pipe under a roadway. Total jacking length is expected to be less than 120ft.





RE: Jack and Bore
RE: Jack and Bore
RE: Jack and Bore
Take some intermediate borings if you can. I have been called in to projects where jacking hit unknown buried debris and caused substantial subsidence below mainline railroad tracks. Not a good time for the contractor!
If you anticipate unstable sandy conditions or groundwater problems, I know of a few projects where the soils along the pipe alignment were stabilized using jet grouting ahead of the main excavation activities.
Jeff
RE: Jack and Bore
RE: Jack and Bore
(ASCE Manuals and Reports on Engineering Practice No. 106) @ http://www.asce.org/bookstore/book.cfm?book=4561 may be of interest.
RE: Jack and Bore
RE: Jack and Bore
RE: Jack and Bore