Laser Screeds are self-propelled four wheel drive, four wheel steer units. It has a 20' telescoping boom with a 12' wide placement head. The screed head itself consists of 3 parts: the plow, the auger, and the vibrator. The plow disperses the concrete evenly, the auger removes the excess material to finished grade, and the vibrator smoothes the surface.The screed has an on board computer system. This system is able to determine the correct elevation height and provide commands for to the head for elevation control.
The machine's automatic laser control system ensures an accurate level finish through the use of electro-hydraulic controls. Laser receivers mounted at each end of the screed head receive a signal from a transmitter multiple times per second providing totally automatic control to finished floor level. A single laser transmitter controls up to 1000 ft enabling the screeds to work to a tolerance of 1/8th of an inch or better.
Concrete is discharged in strips to match the size of the machine approximately 1" higher than final grade. The Laser Screed moves into position and the telescopic boom extended over the discharged concrete. The screeding/compacting head is then lowered to the grade established by the laser-level transmitter. Retraction of the boom causes the screed head to be drawn across the fresh concrete which is leveled and compacted in a single pass. Once a pass is completed, the machine is repositioned to the right with some overlap on the previously screeded concrete. The operation is repeated, ensuring optimum finished level tolerances are attained across the whole floor area.