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(10 m) band of vertical information,” Brian Lingobardo, System Manager for Topcon, explains.
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“We use a rotating laser type of technology which actually puts out a 33-ft. The lasers are set up over an established survey point that is included in the control file to ensure the elevation accuracy of the curb and gutter. The mmGPS lasers are used to control elevation, and long and cross slope are controlled by GOMACO’s G+ control system. The GPS antennas on the GT-3600 are used to track the machine’s movement and calculate its position and heading. On the GT-3600, hardware was added including an integrated GPS antenna and mmGPS receiver, a dual GPS receiver, a GPS antenna and a GX-60 control box which is Topcon’s user interface using their 3DMC software. That, as much as anything, is going to save me a lot of overtime.” Configured for Curb and GutterĮngland’s Topcon 3D equipment inventory now includes three mmGPS laser transmitters, a GPS base station and a GPS rover used to check grade. And at the end of the day, after we’re done pouring, we didn’t have any stakes or stringline to pick up. “It would have probably taken us a day and a half to string, then a day of pouring, so 2.5 days for 16 islands. “We figure about 25 stakes per island and with 16 islands, that’s 400 stakes that have to be set,” England explains. Without the 3D system, he would have still been setting stringline with no concrete on the ground. On the first day with the new system, England slipformed 16 islands. “We’ve had 20 years of looking at stringline on our pours and then there’s none there,” England comments. The curb and gutter profile was an 18 in. (457 mm) wide, 6-in. (152 mm) tall gutter with a 6-in. (152 mm) curb. The contractor had approximately 15,000 ft. (4572 m) of curb and gutter to slipform, including 43 islands with 2.5 to 4 ft. England put his new system to work on a parking lot project recently in Murfreesboro, TN. A Big Change with Big ResultsĮngland has worked closely with the GOMACO 3D controls group, Topcon and Billy Price from Roper Laser, the local authorized Topcon dealer. After watching it work, England was convinced he needed 3D on his projects, too. After researching the 3D systems, the company went and watched another GT-3600 at work in Tennessee with a Topcon mmGPS system. Vinnie Miller, GOMACO’s Southeast District Manager, pitched the concept to England. In 2013, England Contracting added another new GT-3600 to its inventory and was introduced to the concept of 3D stringless paving for curb and gutter. Some we’ve used one time and will never use again and some that I trade every three years because we wear them out.” We have probably 30 different molds in our inventory. “I prefer an auger over a conveyor mainly because it will carry a little bit more concrete through a radius. “The GT-3600 is the only thing I’ve ever run and I know pretty much everything there is to know about them and if it has a problem, I can troubleshoot it,” Scott England, owner and GT-3600 operator for England Contracting, says. More specifically, they specialize in tight radius island paving and other parking lot challenges with their GOMACO GT-3600 curb and gutter machine. England Contracting LLC, based out of Murray, KY, specializes in curb and gutter.