For finish grading Schneider Excavating used its John Deere 750K and John Deere 650K crawler bulldozers equipped with Topcon 3D-MC2 machine control systems for grading. The 3D-MC2 system uses Topcon's GX-60 control box, MC-G3 GPS antenna, and MC-R3 GPS receiver, which is all controlled by software designed to provide position updates up to 100 times per second. The MC2 inertial sensor combines gyros and accelerometers to measure the X, Y & Z position as well as the roll, pitch, yaw and acceleration of the dozer.
The grading tolerances were plus or minus 0.25 inches to provide a stable base for the landscape contractor to achieve the finished results that all are anticipating.
For the 2.5-acre Wildwood Island part of the project, Schneider Excavating built a temporary 600-foot bridge to reach it. They added 7,500 cubic yards to raise the island surface approximately two inches. They used the 650K bulldozer with the Topcon 3D-MC2 system to achieve a finish grade with a plus-minus 5 percent declining slope from its center peak down to the water. Additionally, a gravel bar was added around the island for anglers to stand while casting their lines out.
“We achieved the finish grade easily and completed our four-month portion of this three-year project ahead of schedule by eight days due in large part to our Topcon technology,” Ristow said. “Without the technology, we would have needed twice the crew and our costs would have risen 30 to 35 percent. And it would have taken longer to complete.”
Jeff Winke is a business and construction writer based in Milwaukee, Wis. He can be reached through www.jeffwinke.com.