Screed

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

Paver having a conveyor for loading a following paver

Abstract: A paver ( 1 ) with a chassis ( 2 ) at the front in the paving direction, with a hopper ( 11 ) for receiving material to be paved and, at the rear, with a floating screed ( 5 ), two centrally arranged longitudinal conveyor devices ( 9,10 ) guided through a shaft ( 8 ) being provided between the hopper ( 11 ) and a distributor auger ( 7 ) located in front of the screed ( 5 ) in the paving direction, the hopper ( 11 ) being open relative to the longitudinal conveyor devices ( 9,10 ) and an additional conveyor device ( 33 ) for loading a hopper ( 12 ) of a following paver ( 13 ) being provided. One of the longitudinal conveyor devices ( 10 ) extends from the rear outlet of the shaft ( 8 ), beyond the screed ( 5 ) and to the additional conveyor device ( 33 ) and has a discharge end ( 14 ) which is fixed or adjustable to an appropriate height for loading the hopper ( 12 ). The longitudinal conveyor devices ( 9,10 ) are partitioned off from each other by a vertical separating plate ( 20 ).

Convergent link system for connecting a screed to the traction unit of a paving machine

Abstract: An upper pair of arms is pivotally connected at its forward and rearward ends to the screed and to the rear portion of the traction unit. A lower pair of arms is pivotally connected at its forward and rearward ends to the screed and to the rear portion of the traction unit. Imaginary extensions of the upper and lower pairs of arms converge and intersect at points defining a transversely extending effective tow axis, which axis is disposed adjacent the subgrade and forwardly of the rearwardmost extremity of the traction means supporting the traction unit.

Floor-construction of a composting tunnel and a method for manufacturing it

Abstract: The invention concerns a floor construction for a composting tunnel, which includes main air ducts (11) set inside cast concrete, from which distribution air ducts (12) extend to the floor surface. According to the invention in question, the floor (1) is formed of prefabricated hollow-core slabs (5) that are as such known, the hollow cores (11) of which form the aforesaid main air ducts inside the floor. The invention also concerns a method for manufacturing the floor construction of a composting tunnel, in which method prefabricated units are used in the floor construction and in which the pipe networks and ducts are formed in the floor construction for feeding air to the material on the floor. According to the invention, hollow-core slabs (5) are used as the prefabricated units, the hollow cores (11) of which form the aforesaid main air ducts and at the aforesaid hollow cores (11) holes (18) are formed downwards. Finally a surface screed (9) is cast using casting supports (13) set in the aforesaid holes (18).

Operator platform adjusting mechanism for machines

Abstract: A paving machine is disclosed that includes a tractor, a screed, and an operator platform. The screed is coupled to the tractor and is located behind the tractor. The operator platform is movably coupled to the tractor and has a first position and a second position. In the first position, the operator platform is located at least partially above the screed, and in the second position, the operator platform is located behind the screed.

Process and apparatus for producing floating screeds

Abstract: The invention specifies a process for producing floating cement screeds, in which process first of all a pulverulent liquefier and a pulverulent stabiliser are added to the pulverulent cement. These additives are added to a part-volume of the cement and the entire cement quantity is rapidly mixed, using a turbine agitator, with the total amount of water required for the screed composition until a cement paste is formed. The cement paste is mixed in a further, separate mixer with the sand portion and the resulting free-flowing screed composition is pumped to the place of application and is levelled off on the building floor, essentially of its own accord, with a little low-frequency, mechanical assistance. An apparatus for producing the cement paste comprises a turbine agitator which runs around a vertical axis and the blades of which are restricted such that they press the material, which is to be mixed, against the base of the mixing trough which encloses the turbine agitator. A spiral pump for drawing off the cement paste is driven via an intermediate part which extends beneath the turbine agitator and through the mixing trough, has a non-round cross-section and thus, on the one hand, prevents the composition, which is to be mixed, from rotating with the turbine agitator and, at the same time, itself achieves a mixing action.