The Nevada Department of Transportation (NDOT) utilizes several types of concrete barriers. For permanent installations NDOT typically calls for slip formed or cast-in-place concrete barriers that do not require connecting or base pins. However, for portable precast concrete barrier rails, NDOT utilizes a design that does require barrier connecting rods and anchoring pins. Connecting rods are a galvanized, high strength ASTM A449 forged head design. Anchor pins are a modified version of the standard barrier connecting rod.
Barrier Connecting Rod – PB Part #18358
The Nevada barrier connecting rod is a 1″ galvanized high-strength ASTM A449 design featuring a washer head forged as an integral part of the rod and a horizontal hole through the head or a larger lip on the head for easy removal. It also features a hole drilled through the pin to accommodate a cotter pin and washer that serve to secure the rod in place. Alternatively, a circular washer fillet welded to a rod may be used in place of the forged head as long as all of the dimensions of the rod and washer conform to the forged design shown. An optional 1/2″ bevel may be added to the bottom for ease of installation. Details of both options can be seen on Nevada Standard Drawing Spec #502 Detail Number RB-47B.
Anchor Pins – PB Part #18356
To secure barriers to the ground, a modified version of the standard barrier connecting rod is utilized as an anchor pin. Like the barrier connecting rods, the anchor pins are galvanized high-strength ASTM A449 steel. The only difference is that the anchor pins are not required to have the lower horizontal hole drilled through the pin, nor the cotter pin and washer that would be installed there. These anchor pins are installed horizontally with two anchor rods in each end of each barrier section. An optional 1/2″ bevel may be added to the end of the anchor pins to aid in placement, but the anchor pins must be installed in pre-drilled 1” diameter holes per Note 8. Details of the anchor pins and their use can be found on Nevada Standard Drawing R-8.7.11 (502).