Post Installed Concrete Anchors with Existing Shallow Conc. Slab
Post Installed Concrete Anchors with Existing Shallow Conc. Slab
(OP)
Hello all,
I have a grand stand bleacher project with an existing 3" concrete slab, the details are showing post installed anchors to secure the angle frame bleacher.
I am running Hilti Profis software and it seems like I can't get a structural anchor to work with less than 3.25" slab. Any ideas or tips?
Thank you,
Jon
I have a grand stand bleacher project with an existing 3" concrete slab, the details are showing post installed anchors to secure the angle frame bleacher.
I am running Hilti Profis software and it seems like I can't get a structural anchor to work with less than 3.25" slab. Any ideas or tips?
Thank you,
Jon





RE: Post Installed Concrete Anchors with Existing Shallow Conc. Slab
Jeff
Pipe Stress Analysis Engineer
www.xceed-eng.com
RE: Post Installed Concrete Anchors with Existing Shallow Conc. Slab
Alternatively if you have a slab on grade, could you cast concrete piers on the slab or use drilled piers through the slab to provide additional anchor depth and cover?
RE: Post Installed Concrete Anchors with Existing Shallow Conc. Slab
RE: Post Installed Concrete Anchors with Existing Shallow Conc. Slab
I appreciate the comments.
RE: Post Installed Concrete Anchors with Existing Shallow Conc. Slab
RE: Post Installed Concrete Anchors with Existing Shallow Conc. Slab
1) Ignore the minor difference, accept as-is.
2) Add a few more holes and Hilti's. (One or two per bleacher frame or row.) More
threaded rods = less force per rod needed = 3 inch becomes an acceptable engagement depth.
3) Drill each all the way through (many places the nominal concrete will be deep enough to be acceptable. Use stainless rods and glue (epoxy) them in to withstand corrosion from below slab water.
4) Drill all the way though and use pull-back (through wall) type Hilti's. You will get better capacity per bolt.
5) SLightly increase the diameter on each rod. You will increase the pull-out force on each because there is greater circumference for the epoxy to grip, so your 3 inch to 3.25 length difference becomes less important.
RE: Post Installed Concrete Anchors with Existing Shallow Conc. Slab
RE: Post Installed Concrete Anchors with Existing Shallow Conc. Slab
Dave
Thaidavid