CLOSE PROGRAM - http://www.columbus.gov/close
Description
ADA Curb and Ramps refers to the removal and installation of curbs, sidewalks, and ramps at a ramp intersection. Inspectors should check ramp submittals and GIS drawings for details on ramps, if there is a conflict between the ramp list in the plans and the GIS drawings, default to the drawings for the proper ramp type and locations. For each ramp, when sidewalk or curb is removed, the inspector will pay for ADA maintaining traffic. All ADA ramps are required to have temporary patches for any lip exceeding a quarter of an inch. If there is an inlet at the corner, curb and gutter will be installed between the two ramps to allow for proper drainage.
If a stop or yield sign are removed due to ramp construction they must be re-erected immediately. However, if a street name sign is removed due to ramp construction, record the intersection in your report. New post installation will not be paid until the city sign shop installs the sign.
Specific terminology for a ramp is described below along with a picture “ADA Ramp Pic” to give a demonstration for allowed ramp dimensions. Each ramp will have a detectable warning that will be placed over top of it. If the ramp type is an R4 or R5, the detectable warnings should not be paid until after it is installed. Inspectors should provide a drawing of the intersection in their report for clarity.
When pouring concrete, there is a 90 minute batch time, if a load has exceeded this time it is to be rejected. All concrete is to be tested once per week unless it will be under traffic, then it will have to be tested before the area is opened. Placement of topsoil and seeding and mulching will also be paid for when placing concrete, calculations can be determined by using the Earthwork Calculations Worksheet found in the forms subheading. Ramp quantity worksheets should be entered in the Resurfacing google drive under the concrete calculations for each individual project.
Information regarding specific pay items:
ADA Ramp Terminology
Ramp – Access route from street to landing. Max running slope is 8.3%, cross slope is 2% and cannot be longer than 15ft.
Landing – Max slope in all directions not to exceed 2% and must be of minimal dimension of 4ft by 4ft
Transition – Basically another ramp that bridges the landing to the access route (existing sidewalk.) Max slopes and cross-slopes same as ramp.
Flare – Used to taper sides of a ramp. Can be short or long, varies based on ramp type. Short flares are 1ft at widest point, Long flares vary in dimension based on existing curb height but should not exceed 10% slope.
Counter-Slope – Grade at bottom of ramp at road surface. Cannot exceed 5%.
Detectable Warning – A raised and textured surface mat at bottom of ramp. Should be positioned no less than 6”, and no more than 8” behind face of curb.
PAR (pedestrian access route) – Route required for handicap access to ramp and landing. Must be minimum of 4ft width (exceptions can be made.)
Ramp Type – General configuration of ramp design. See standard drawings for details
Specifications & Supplements
Item 202: Removal of Structures and Obstructions
Item 608: Walks, Curb Rumps, and Steps
Item 609: Curbing, Concrete Medians, and Traffic Islands
Item 610: Cellular Retaining Walls
Item 614: Maintaining Traffic
Item 630: Traffic Signs and Sign Supports
Item 653: Topsoil Furnished and Place
Item 659: Seeding and Mulching
Supplemental Spec 1550: Curb Ramps
Supplemental Spec 1551: Detectable Warnings
Supplemental Spec 1630: Installation of Ground Mounted Signs and Sign Supports
Standard Drawing 2000: Curb, Straight 18"
Standard Drawing 2010: Combined Curb and Gutter, Type Standard
Standard Drawing 2020: Combined Curb and Gutter, Type Special 8”
Standard Drawing 2030: Combined Curb and Gutter, Type Mountable
Standard Drawing 2185: Street Name Sign
Standard Drawing 2300: Sidewalk
Standard Drawing 2301: Brick Sidewalk
Standard Drawing 2303: 8” Concrete Walk at an Intersection with an Arterial Street
Standard Drawing 2319: Curb Ramps
Standard Drawing 2320: Pipe Roof Drain
Standard Drawing 2328: Concrete Steps
Standard Drawing 2331: Concrete Median
Typical Pay Items
Item 201 – ADA Tree Removed (Each)
Item 202 – ADA Curb and Gutter Removed (Linear Feet)
Item 202 – ADA Curb Removed (Linear Feet)
Item 202 – ADA Walk Removed (Square Feet)
Item 203 – ADA Excavation (Cubic Yards)
Item 604 – ADA Inlets Adjusted to Grade (Each)
Item 608 – ADA Concrete Walk, 4” (Square Feet)
Item 608 – ADA Concrete Walk, 8” (Square Feet)
Item 608 – ADA Curb Ramps (Each)
Item 608 – ADA Detectable Warnings, Type D (Each)
Item 608 – ADA Detectable Warnings, Type E (Each)
Item 609 – ADA Combination Curb and Gutter, Type Standard (Linear Feet)
Item 609 – ADA Curb – Straight 18” (Linear Feet)
Item 610 – ADA Cellular Retaining Wall (Square Feet)
Item 614 – ADA Law Enforcement Officer, Without Patrol Car (Hours)
Item 614 – ADA Maintaining Traffic, As Per Plan (Each)
Item 630 – ADA Removal of Ground Mounted Sign and Storage, Re-Erection (Each)
Item 653 – ADA Topsoil Furnished and Place (Cubic Yards)
Item 659 – ADA Seeding and Mulching (Square Yards)
Item 807 – ADA Valve Boxes Adjusted to Grade (Each)
Item SPEC – ADA Concrete Curb 12” Behind Walk (Linear Feet)
Forms
Curb Ramp Compliance Checklist
Ramp Quantity Worksheet
Earthwork Calculations
ADA Concrete Agreed Quantity Form
Photos
ADA Ramp Terminology Picture