PEInc...I see what you're saying, but I think it's a misprint on the call-out on the Unbonded Zone Detail where it says "bare strand". The strands in the unbonded zone have to be sheathed in plastic. That's the way the suppliers priced it.
Agreed, the 40 ft. bond zone is way overkill...
PEInc, the designer's sequence states to drill an 8" diameter hole 30 ft into rock, place grout in the hole, and plunge a 6.625" O.D. casing into the grouted hole. I guess the intent is for this 30 ft rock socket to resist the 172 kips. Remember, I'm just the 'dumb' contractor.
Thanks for the input guys/gals, the job is on Mount Washington in Pittsburgh. I think you're right, they want to avoid cracking the precast lagging.
Here are a few more details.
https://res.cloudinary.com/engineering-com/image/upload/v1706110889/tips/Latent_Anchor_Drwgs_2_dp1y13.pdf
I think I figured it out.
Attached is the installation sequence. The permanent casing is socketed 30 ft. into rock. As shown in the anchor head detail, the casing is welded directed to the bearing plate, i.e. no "trumpet" is used. The strand anchor is pre-stressed against the casing, not the...
I work for a heavy/ highway contractor. We are bidding a job with an anchored soldier pile/ precast lagging wall. The designer has termed the rock anchors as "latent anchors". What is meant by "latent" in this context? Thanks.
