Screed

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

Powered roller screed

Abstract: A powered rotary screed provides a powered strike tube that rotates to provide a finish to wet concrete during screeding and a drive tube that provides motive power to the screed to assist with the difficult task of removing excess concrete from a poured pad, or other horizontal concrete surface. No framework or other supporting structure extends between ends of the screed thereby making the screed more portable than comparable screeds having a structure that supports the roller tubes and extends the length of the screed. Handles are pivotally coupled to plates at each end of the screed to maneuver and control the screed during operation. Because the handles are pivotally mounted, they can be pivoted outward to permit the screed to maneuver close to obstacles located near the pad. Additionally, the combination of the handles, strike tube, and drive tube permit the handles to be used as levers to control the effective motive power of the drive tube, thereby providing substantial control to the screed operators.

Screed extender speed control

Abstract: A control system for an extendable screed includes a first input device configured to set a speed limit for the extendable screed, a second input device configured to vary a speed of the extendable screed within the speed limit The controller further includes, a third input device configured to govern a relationship between a speed of the extendable screed and a relative position of the second input device The control system further includes a controller configured to receive inputs from the first, the second, and the third input devices and output a command signal to move the extendable screed relative to the main screed

Screed device in a road-paving vehicle such as asphalt finisher

Abstract: A screed device in a road-paving vehicle such as an asphalt finisher, enabling the width of pavement to be steplessly changed up to about three times the width of the main screed through a simple operation. The screed device is so constituted that a pair of extensible screeds 15, 16 having a width nearly equal to the width of a main screed 7 are arranged back and forth in the direction of progress of the main screed, wherein supports 27, 28 are allowed to move in the direction of width of pavement being supported by support portions 23, 24 provided on both sides at the rear upper portions of the main screed 7, said extensible screeds 15, 16 are supported by said supports 27, 28 so as to be freely moved in the direction of width of pavement, and the extensible screeds 15, 16 are moved by the feeding devices such as hydraulic cylinders in the directions of width of pavement but opposite to each other from the rear positions of the main screed 7.

Control for screed heaters

Abstract: A screed for a paving machine has at least a base portion having an associated heating element connected to a heating element controller. An extension screed portion is connector to the base screed portion and has a respective heating element connectable to the heating element controller. A temperature sensor is associated with each of the base and extension screed portions and a device is adapted to controllably connect selected ones of the base and extension screed temperature sensors to the heating element controller.

Screed bar for vibratory screed

Abstract: A screed bar for a vibratory concrete screed is formed from a long hollow extrusion having generally flat enclosing walls and defining in cross section two triangular sections that share a common interior wall.