Ramp railing anchor plates

[archlvf]

I'm designing an ADA ramp, with steel guardrail. I'd prefer to surface mount the posts with a large-ish anchor plate. To avoid blowing out the slab edge, I'm setting the anchors in-board a bit. wondering how worried I need to be about the height of the plates and associated bolts? Would they need to meet the 1/2" max rise (with 1/4" bevel)?

 

[Mr. Inspector]

If in the accessible route yes.

 

[archlvf]

If in the accessible route yes.

the width of the ramp is wider than needed for ADA. (IE, the accessible path width fits between the mount plates). but I'd assume there's a rule about how far away the handrail could be from the accessible path...?

 

[tbz]

I'm designing an ADA ramp, with steel guardrail. I'd prefer to surface mount the posts with a large-ish anchor plate. To avoid blowing out the slab edge, I'm setting the anchors in-board a bit. wondering how worried I need to be about the height of the plates and associated bolts? Would they need to meet the 1/2" max rise (with 1/4" bevel)?

Welcome to the forum,

first off you noted between the guards, so my question is where are the handrails in relation to the guards?

Are these 34"-38" high handrails with infill below, or are these truly 42" high guards with 34"-38" high handrails offset to the inside of the guards?

If these are the later, offset inwards, then as long as, the inside edge of the handrail plumbs down to be further inward than the plates you should be fine.

If this is the former, then they should be beveled for safety, just because the width between the handrails is proposed to be larger than 36", this does not change the use of the handrail and possibility of conflict in clear space.

JMO

 

[Paul Sweet]

I think that any projection inside the handrail would be considered in the accessible path. Some people have to stay close to the rail to keep their balance.

 

[Mark K]

In response to the original question, you need an engineer. There are provisions in the IBC that an engineer can use to design the anchorage of the post.

 

[Jean Tessmer-HI]

I'm designing an ADA ramp, with steel guardrail. I'd prefer to surface mount the posts with a large-ish anchor plate. To avoid blowing out the slab edge, I'm setting the anchors in-board a bit. wondering how worried I need to be about the height of the plates and associated bolts? Would they need to meet the 1/2" max rise (with 1/4" bevel)?

It sounds like you are welding the steel handrail and mounting plates? Can you offset the plate so more of the plate is on the outside of the ramp?
Since the handrails are required to be on saddle straps and those protrude about 3 inches into the accessible route, you might be able to line up the support mounts with the 3 inch protrusion of the handrails and can even mount the required edge protector above the mounting plate. Or have your mounts high enough to be in the detectable zone but still clear of the minimum 36 inches between the inside faces of the handrails.

 

[ADAguy]

1. Don't forget the continous wheel guide requirement
2. if drilling into the concrete beware of popouts it too close to the edge.
3. Horizontal load min. 200lbs.
4. are you an architect or a fabricator?