Abstract: A screed with a trussed beam having a cross-section in the geometrical shape of an equilateral triangle used to support tools for working plastic concrete. The beam is supported between spaced apart, wheeled carriages riding forms bounding the plastic concrete. The beam is oriented such that the cross-sectional triangle is inverted with the wide base at the screed top and the apex at the bottom. The inverted triangular truss beam has sufficient space to suspend working tools substantially within the peripheral edges of the beam. The screed uses upstanding integral outriggers so that the pitch at the center of the screed can be adjusted exteriorly to the pour site. A rotary spreader displaces concrete forwardly without deleteriously compressing it as the screed moves forwardly.

Abstract: A screed with a trussed beam having a cross-section in the geometrical shape of an equilateral triangle used to support tools for working plastic concrete. The beam is supported between spaced apart, wheeled carriages riding forms bounding the plastic concrete. The beam is oriented such that the cross-sectional triangle is inverted with the wide base at the screed top and the apex at the bottom. The inverted triangular truss beam has sufficient space to suspend working tools substantially within the peripheral edges of the beam. The screed uses upstanding integral outriggers so that the pitch at the center of the screed can be adjusted exteriorly to the pour site.

Abstract: The screed includes an elongated blade vibrated by a centrally located, eccentric weight. The blade is supported by an elongated shaft extending to a power source that drives the weight. An associated operator handle facilitates convenient manipulation of the screed. A unique vibration dispersion system enables the centrally located weight to effectively vibrate the entire blade length. The dispersion system includes an elongated, rigid integral brace extending the entire blade length. The brace secures to the eccentric weight via a vibratory housing. Vibrations from the housing force the blade to vibrate violently to consolidate the plastic concrete. As the screed is drawn across wet plastic concrete, it simultaneously consolidates the concrete by vibrating it thoroughly throughout the monolith while also striking off and levelling the top layer of the concrete.