Screed

About: Screed is a research topic. Over the lifetime, 1899 publications have been published within this topic receiving 11118 citations.

Apparatus for screening and trowelling concrete

Abstract: Disclosed is an apparatus for screeding or trowelling concrete or similar materials. The apparatus has a turret, mounted on a mobile frame. A telescopic boom is mounted in cantilevered fashion on the turret. A machine head, mounted on the distal end of the boom, is rotatable about a vertical axis. An attachment, such as a screed or a trowel, is attached to the machine head. The level and angle of the frame can be set to a selected elevation relative to a rotating laser beam by raising or lowering three hydraulic legs. The machine head can raise or lower the attachment to set the attachment at a selected elevation.

Road paver-finisher with a combination of axles with steering wheels and crawler units

Abstract: Road paver-finisher comprising a screed unit (11) and a tractor unit (10), the latter comprising a hopper (13), one or more feeders or conveyors (14), one or more augers (15), a main frame (12), a combination of one or more axles with steering wheels (12'') and one or more crawler units (12'''), the latter comprising a crawler belt (50), a driving wheel or sprocket (51), a stretcher wheel (52) and a multitude of supporting rollers (54).

Screed heating arrangement

Abstract: A screed heating arrangement is provided for a screed assembly that is towed behind a paving machine. The screed heating arrangement includes at least one electric heater bonded to an upper surface of a screed plate.

Hot-in-place asphalt recycling machine

Abstract: A process and device for the recycling of asphalt including at least one preheater unit. The preheater having a heater, scarifying rakes, and a bin to dispense aggregate. Also include is a recycling machine having a heater, scarifying rakes, a plurality of extension mills, a main mill, as well as a pug mill having first and second downwardly rotating rotors, the pug mill mixes asphalt and liquid additives together to form a homogenous mix; and at least one screed for laying the homogeneously mixed asphalt to grade.

Apparatus and method for controlling laser guided machines

Abstract: A guidance system and method for increasing the accuracy of laser guided machines such as screeds, graders, earth movers, floor saws and floor finishing machines. The system includes a laser beam receiver for sensing a laser reference beam provided off the machine. The laser receiver signals an electrical circuit when the laser beam is sensed in both centered and off-center regions. The electrical circuit operates a controller such as a solenoid operated fluid valve which controls a power source such as a fluid cylinder to move a machine element in one direction, such as raising a concrete screed, when the beam is sensed in the centered region, and in the other direction, such as lowering the screed, when the beam is sensed off-center. The method includes controlling the power source to continuously cycle the machine element between centered and off-centered regions to reduce the dead band, i.e., nonactive tolerance range, of the system.