Piezo Loop Piezo Installation

Install Loop

• 1

  Place the pull box three feet from the shoulder of the road, measuring from the edge of the asphalt. Toward the center line of the road, measure eight inches from the edge of the asphalt and spray paint a dot. Drill a hole at a 45-degree angle through the asphalt toward the pull box. Leave the bit in the asphalt and dig down at the edge of the asphalt until you discover it in order to expose the hole.

• 2

  Spray paint a 6-foot by 6-foot square in the center of the lane. First, measure the width of the lane and subtract six feet. Divide the remaining distance by two for your sum. Put a dot a distance equal to the sum from the edge of the asphalt and another of equal length from the center line of the road toward the pull box.

• 3

  Lay the 6-foot, 2-inch by 4-inch board parallel to the center line with the edge of the board bisecting the dot. Spray along the edge of the board. Bisect the dot next to the edge of the asphalt, adjust the board until each end is six feet from the corresponding end of the sprayed line running parallel to the center line. Spray along the edge of the board. Connect the ends of both sprayed lines by laying the board between the corresponding ends and spray painting a straight edge between them.

• 4

  Saw along the spray painted lines with a concrete saw. Saw at least three and a half inches deep. Saw a groove from the 45-degree hole to the square. Place one lead of the loop cable--an end--next to the pull box. Feed the cable up through the 45-degree hole. Pull all but three feet through the hole. Lay the cable in the saw groove. Lay four loops of cable in the square, then feed it back through the hole and put the other lead next to the pull box.

• 5

  Lay backer rods on top of the loop cable around the entire square. Mix the epoxy grout in a five-gallon bucket according the the manufacturer's specifications. Pour the epoxy in the grooves over the backer rods and cable. Trowel the epoxy smooth and allow it to cure.

Install Piezos

• 6

  Drill two holes in the shoulder of the road. Drill one on each side of the loop shoulder hole. Drill each one eight inches from the edge of the asphalt, each one nine feet from the loop shoulder hole. Leave the bit in the ground each time and dig it up with a shovel to expose your hole.

• 7

  Spray a straight line from the holes to the center line of the road. Saw 3 1/2-inch grooves along the lines. Feed the piezo leads through the holes, pull the cables through to the center lines and lay them in the groove. Put backing rods on top of the cables and grout the grooves.

• 8

  Connect the leads of the piezos and the loop to the pull box. Connect the pull box to a power source. Turn on the pull box and adjust the settings to the manufacturer's specifications.