Road Kop - Speed Cushion Specifications
GENERAL
Design Specifications are based on Road
Kop preformed speed cushions as manufactured by Road Kare
International, 530 Jesse St., Grand Prairie, TX 75051.
In order to consistently meet the
following specifications, the cushions shall be manufactured in the USA
by an ISO 9002 approved company. Other manufacturers may be approved
with prior approval from architect/engineer.
DIMENSIONS
The speed cushions are modular in design
with the standard width being 6'6" and standard lengths being 6'8" and
10'0". Both width and length are easily adjustable by adding or
changing modules. The speed cushion has a flat top with a height of 3".
The entrance and exit ramp gradient is 1 in 10 (max.) and the side ramp
gradient is 1 in 4. The entrance, exit and side ramps provide a smooth
transistion to the pavement with the maximum "step" in this transistion
not to exceed 1/2".
MATERIAL
The speed cushion modules are made from
100% recycled rubber and polyurethane, making the speed cushion
impervious to motor fuels, oils, solvents, road salts and outdoor
environments. The rubber is obtained from recycled truck and
tractor tire treads which is all rubber. The rubber, in fiber form up
to 1/2" long, contains no rubber dust, granules or fly that will weaken
the product. They are compression molded and have the following
properties:
- Shore A Hardness - 65 minimum
- Specific Gravity - 1.13
- Skid Resistance - 89 (dry)
- Tensile Strength - 500 psi minimum
- Deform Rate - None (100% recovery after compression)
The speed cushions are black in color. The standard factory marking
(optional) is 2 white reflective arrows made of pavement marking tape
and molded into the rubber for long term durability. The standard
arrows are 16" wide by 27" high.
INSTALLATION
Modular sections of the speed cushion are linked together with metal
dowels to ensure stability and equally distribute stress loading.
Modular sections are fastened to the pavement using supplied 10 mm OD
stainless steel lag bolts 4 3/4" long and 10 mm stainless steel
washers. The standard size speed cushion (6' 6" wide x 6' 8"
long) fastens to the pavement with forty (40) lag bolts. The
extended size speed cushion (6' 6" wide x 10' 0" long) uses
fifty-four (54) lag bolts. Galvanized or electro-plated
fasteners shall not be accetable. The lag bolts are inserted
into pre-drilled 9/16" OD holes in the pavement that have been filled
with the two part quick-set resin just prior to insertion of the
high-density polyethylene pavement anchor that is 9/16" OD x 3/8"
ID x 4" long. The resin used must set quickly and cure
completely in 45 minutes or less at temperatures as low as 68°F (faster
at higher temperatures - slower at lower temperatures). This
allows the site to be opened to traffic immediately after
installation. Epoxy resin or similar products requiring cure
times in excess of 45 minutes shall not be acceptable. Each
hole in the modular section is then filled with a rubber cap after
installation to cover the bolt head.
All necessary bolts, washers, anchors, dowels, resin and rubber caps shall be supplied with each speed cushion.
ROAD KOP - SPEED CUSHION DIMENSIONS
