"We see how far we will mill, so we can finish milling and Rea can finish paving, all at a happy medium," Moore says. "We also have to figure in cutter tooth changes, and that will slow us down a little. Right now we do a complete cutter tooth change every 1,000 to 1,100 feet; the more efficiently we can change the 130 milling teeth, and install new ones, the faster we can get back to work."
Lane's complete tooth change using Wirtgen quick-change toolholders will take about 15 minutes.
Hydro-sweeping and infrared drying
Following the W 2200, a standard street sweeper was cleaning the milled surface, followed by a contract hydrovacuum truck which was water-blasting any remaining material off the surface, and vacuuming it into a tank for disposal.
"We're picking up the heavy stuff with the sweeper, and then we have a 36,000 psi-capable hydrovac truck clean the pavement with sprayed water, and vacuum up the water and any fines," Moore says. "This surface has to be totally spotless before we apply our tack coat."
And because the surface has to be bone-dry before the tack coat - and not much time in which to dry - Lane was using an infrared heater truck with generator to dry the milled surface prior to tack and overlay. "The truck has two 195-mph blower fans which blow off any standing water, and heating coils which evaporate any remaining moisture."
Lane's W 2200 with full-lane width drum was giving Lane the power and reliability it needed to keep this project on schedule and in budget.
Moore was finding that the new Eco-Cutter drum from Wirtgen was keeping the job moving along with accrued savings from use of fewer teeth. "This is the first application for which we've used this full-lane drum," Moore says. "This application is nice for the full-lane drum because it's one lane, one way, without having to back up and go. And the drum has a coarser pattern to it. My feeling is, 'the coarser, the better', because the asphalt can hold tighter in the voids than it can in a smoother surface."
Fewer cutting tools on the new Eco-Drum means less resistance to cutting and a higher rate of advance, with lower tool costs per milled cubic yard. These drums, with smaller number of point attack tools, make sure work proceeds more quickly and cost-efficiently.
Despite the fact that the standard-width Eco-Cutter may equipped with only 114 cutting tools, its performance with 1-inch tool spacing is roughly 20 percent higher than that of a standard milling drum with 0.6-inch tool spacing when working in hard asphalt and at a milling depth of 8 inches.
About the Wirtgen W 2200
W 2200 lets users mill large projects in a short period of time.
The W 2200 has a standard cutting width of 87 inches, four large D-6 crawler tracks, a milling drum with a high-efficiency mechanical belt drive, and an efficient front-loading system. It has a mechanically driven milling drum and two-part slewing front-end discharge conveyor of variable height. The machine travels on crawler tracks. Robust welded construction with mounts for the individual function modules and superstructures. The tanks for diesel fuel and water are integrated into the chassis. The hydraulic fluid tank forms a separate unit.
Its maximum cutting depth is 14 inches and with the optional Flexible Cutter System, can cut up to 14 feet 1 inch wide. The W 2200 has an operating weight of 96,342 pounds with a 900-hp power plant.
The walk-through operator's platform with access ladder on each side is located in the middle part of the machine. It is equipped with two identical control consoles which can be pivoted and vertically adjusted. Both control consoles and the right-hand driver's seat can be displaced outwards beyond the edge of the machine. The steering and feed control operate with electrical proportional action and are controlled via joysticks.
The Wirtgen information and diagnosis system - called the WIDIS 32 - provides the driver with comprehensive up-to-the-minute information on the current status of the engine and hydraulic system and generates visual and acoustic alarms when necessary. The crawler tracks are suspended from the chassis via round cylinders, the height of which can be adjusted hydraulically. The height of each crawler track can be adjusted individually. The height required for the milling depth is adjusted via the two cylinders at the front, while the rear crawler tracks form a full floating axle. The large lift ensures considerable ground clearance simplifying such difficult maneuvers as reversing or loading and unloading the machine from a low-bed truck.