| 摘要 |
An apparatus for pivoting a screed assembly during screeding of placed and/or poured, uncured concrete or like loose, spreadable materials to maintain proper screeding contact by the screeding assembly with the concrete or like material by maintaining the predetermined levels of concrete or other like material acting against the screed assembly as it is moved along the concrete. The apparatus requires a support preferably of the self-propelled type, having a boom and a boom mount. The axis of the pivot extends generally perpendicularly to the screeding direction in which the screed assembly is moved. A power source, such as a fluid cylinder rotates the screed about the pivot axis, preferably in response to a leveling sensor mounted on the screed. The lateral incline of the screed perpendicular to the screeding direction may also be separately controlled. A power operated elevation control is preferably responsive to a fixed laser beam reference plane positioned externally of the screed assembly. The screed preferably includes a novel lightweight and is vibrated electrically rather than mechanically vibration assembly is vibrationally isolated from the remainder of the screed for smoothing the concrete.
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