Small Radius Hadicap ramps?
Small Radius Hadicap ramps?
(OP)
In the small town that I am City Engineer in, we have a lot of older neighborhoods that 5' radius corners. We have a grant to install sidewalk in some of these areas. However, he grant does not include money for purchase of additional right-of-way. Because it is federal funds, we have to install handicap ramps on the corners where we are installing new sidewalk.
Has anyone seen a design for a handicap ramp that meets ADA requirement for small radius corners? If so, where can I get a look at it?
Thanks,
C. Alan
Has anyone seen a design for a handicap ramp that meets ADA requirement for small radius corners? If so, where can I get a look at it?
Thanks,
C. Alan





RE: Small Radius Hadicap ramps?
RE: Small Radius Hadicap ramps?
Clifford H Laubstein
FL PE 58662
RE: Small Radius Hadicap ramps?
http://www.buildersbooksource.com/cgi-bin/booksite/20010.html
If you post your fax #, I will send you a drawing out of CALDAG that might work.
RE: Small Radius Hadicap ramps?
By the way, it does not matter if federal funds are involved, any time work is done on street or sidewalk a compliant handicap ramp must be installed. There is no option. The city were I work is installing about 130 new ramps this year.
RE: Small Radius Hadicap ramps?
Thanks! That publication is great. Just yesterday, I was in a meeting with a town engineer and we were discussing handicapped ramps. In his experience, the typical details we tend to cut and paste aren't constructed to be code-compliant. He had great solutions for the design - and there are even more in that publication. Also, the report has photos and sketches, which make things much clearer than what is shown in the ADA regs.
Thanks for the great tip!
Kate
RE: Small Radius Hadicap ramps?
That publication looks great. I did find a CALTRANS standard ramp that looks like I could modify it to go on a corner. The ramps are here: http://www.dot.ca.gov/hq/esc/oe/project_plans/highway_plans/stdplans_metric_99/viewable_pdf/a88a.pdf
I am dealing with Case 'c'. I have no avalible ROW behind the corner, so the normal 4' landing behind the ramp is not possible. This ramp design appears to meet the ADA requirments. It has the 8.33% max slope, but this tends to make for very long approach ramps. I think that if I bump the maximum slope up to 9.00% I still will be in within the design peramiters.
gtrainor: My fax# is 661 758 7239 I would love to take a look a the CALDAG design.
Thanks, C. Alan
RE: Small Radius Hadicap ramps?
http://www.pbase.com/caw18/ramp_design
Comments are welcome.
Thanks,
C. Alan
RE: Small Radius Hadicap ramps?
Comments on your design:
The tactile surfaces should have the long dimension parallel to the crosswalk. Angling them like that may lead blind pedestrians to cross diagonally into the middle of the intersection.
The bottom of the ramp will leave wheelchairs up on two wheels, and make them want to rock. Disconcerting and difficult for the user.
RE: Small Radius Hadicap ramps?
RE: Small Radius Hadicap ramps?
It looks like I should put the 8.33% slopes back in.
If the truncated dome surface section should be parallel to traffic, where on the design shoud the truncated surface be?
Thanks,
--C. Alan
RE: Small Radius Hadicap ramps?
RE: Small Radius Hadicap ramps?
RE: Small Radius Hadicap ramps?
http://www.fhwa.dot.gov/environment/bikeped/dwm.htm
RE: Small Radius Hadicap ramps?
http://www.pbase.com/caw18/ramp_design
Thanks for your help!
-C. Alan
RE: Small Radius Hadicap ramps?
I have a few questions about your design. I designed
a few parking lots and we where told that ADA could only
be 2% Maximum.
1) If this is so, why do you have 8.33% in the
two corners?
2) Shouldn't the grade from 2% to 8% be a gradual
increase it looks like a retaining wall might be
required along the sidewalk.
Are designs for sidewalks and parking lots could not
exceed 3.5% unless we had a manhole near a steep grade.
Can you please clarify. I am kinda new in this
department.
RE: Small Radius Hadicap ramps?
C Alan, your design looks fine to me. But there is still some question about the domes being even in the flat section. It seems that there is some contradiction in the CalDag. Please see the lower note on fig 28. It states that domes are still needed on the flat area if adjoined to vehicular traffic. I don't know what that means. You may want to consult with ADA directly.
RE: Small Radius Hadicap ramps?
CadAndy:
I think the 8.33% slopes are allowed on handicap ramps because of the limited space avalible in the street right-of-way. Most streets have 6" curbs, and the corner areas are limited.
Yes, I am going to have to put in a retaining curb along the backside of the sidewalk.
Ideally, the transition from 8.33% to 2% should be gradual, however, the use of the truncated domes may make this difficult. That stuff is rigid plastic.
RE: Small Radius Hadicap ramps?
Thanks guys. Its always good to get
other ideas on different designs.