Precast jersey barrier as retaining structure
Precast jersey barrier as retaining structure
(OP)
It is proposed to use precast Jersey barrier to retain a pedestrian walkway. The walkway is leveled with the top of the barrier. The barrier will rest on a crushed stone base. The height of the barrier has to be around 36" +/-.
I found typical barrier (Type 1) at NJDOT which is 32" high:
http://w ww.state.n j.us/trans portation/ eng/CADD/v 8/v8Roadwa yDetails/p df/056_CD- 607-3Barri erCurb.pdf
The above detail shows the barrier is anchored to a concrete base which is not the case for my intended purpose. Rough calculations shows the 32" high barrier's weight is estimated around 450 lb/lf, and to retain same height of soil including L.L. surcharge of about 100 psf the barrier weight should be increased (about 550 lb/ lf). I think this could be achieved if the barrier's base is wider.
-Is there a standard barrier type that would provide the height/weight requirements?
- Is better to dowel the barriers together or place them loose?
Thanks
I found typical barrier (Type 1) at NJDOT which is 32" high:
http://w
The above detail shows the barrier is anchored to a concrete base which is not the case for my intended purpose. Rough calculations shows the 32" high barrier's weight is estimated around 450 lb/lf, and to retain same height of soil including L.L. surcharge of about 100 psf the barrier weight should be increased (about 550 lb/ lf). I think this could be achieved if the barrier's base is wider.
-Is there a standard barrier type that would provide the height/weight requirements?
- Is better to dowel the barriers together or place them loose?
Thanks





RE: Precast jersey barrier as retaining structure
RE: Precast jersey barrier as retaining structure
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RE: Precast jersey barrier as retaining structure
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RE: Precast jersey barrier as retaining structure
A "run of thumb" for a gravity wall is that it will be stable if the base is at least as wide and one third the height. The New jersey" barriers I have seen come close to that
What about railings? If you set them in the walkway slab, that places the "live loads" somewhat back from the wall.
Why New Jersey barrier? If cheap or free, yes. However, cheap walls can be made from reject concrete blocks at ready mix plants. They measure about 2 x 2 x 4 to 6 ft. and have more weight per ft. of height as compared to the barrier. These also look like stone on the fronts. A 4 ft. high wall easily meets the "rule of thumb". They key together along the line and have notched tops for geogrid anchoring for higher walls.
RE: Precast jersey barrier as retaining structure
I've not seen a safety barrier wall where the retained side was subject to a surcharge. But that is more likely due to seeing them where they're open for all, on the roadway. Typically, they hold back a slope with a 3 to 1 or steeper.
Also having them used as doublt duty (barrier and retaining wall) means that the barrier is at a roadway and so the resistance is enhanced with the moment slab that is referred to above.
As to heavier bases, there are a myriad of SBC out in industry and you need only talk to the contractors to find which is best for your project. If the barrier is long enough, the contractor will want to slip form this and so your going to be dependent on the type of slip form he has. If the barier is relaively short in length, then they will use forms and the forms are split so you can actually get what ever width you need.
Regards,
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