Showing papers on "Screed published in 1986"

Extensible screed assembly for a bituminous paver

Abstract: An extensible screed assembly for a bituminous paver incorporates a pair of screed extensions which are movable laterally outwards of the paver in order to pave roadway widths greater than that of the main screed. The screed extensions feature means by which the attack angle of each extension can be adjusted relative to the attack angle of the main screed and by which the alignment of each extension can also be adjusted relative to that of the main screed.

Variable width material distribution system for asphalt pavers and the like

Abstract: An asphalt paver, of the type having a power extendable floating screed, is provided with a power extendable auger-like material distribution mechanism, such that the width of the distribution mechanism can be varied with the width of the screed. The variable width distribution mechanism is structurally independent of the floating screed, so as not to impart its reaction forces to the screed. A variable width panel arrangement is incorporated into the power extendable distribution mechanism and is extendable and retractable along with the latter to provide for proper confinement of the paving material during lateral distribution.

Self-adjusting, self-leveling tandem screed

Abstract: A tandem screed for use with a paving machine for compacting and smoothing asphalt paving composition includes a front screed mounted at the end of a towing arm and a rear screed mounted to the rear of the front screed and laterally extensible with respect thereto A rear screed hydraulic cylinder is hooked up in series with a tow point hydraulic cylinder such that as the tow point is lowered, the rear screed is lowered with respect to the front screed; and as the tow point is raised, the rear screed is raised with respect to the front screed The rear screed is thereby maintained at the same elevation as the front screed as the tow point is raised or lowered, thus avoiding bumps and irregularities in the pavement surface In addition, self-leveling circuitry actuated by the stopping and restarting of the paving machine automatically brings the screeds to a level orientation with respect to the mat as the paving machine is stopped, and returns the screeds to their original angle of attack as the paving machine is restarted In this manner, bumps in the mat resulting from stopping and restarting the paving machine are eliminated

Vibratory screed including a laterally displaceable oscillating strike-off

Abstract: A vibratory concrete screed includes a frame having first and second ends and a length equal to or greater than the width of plastic concrete to be finished. A screed blade is coupled to the screed frame and engages the full width of the plastic concrete. Vibration generating structure is coupled to the screed for vibrating the screed blade. An oscillating strike-off is positioned in front of the vibrating screed blade to level, smooth and compact the plastic concrete surface before engagement by the vibrating screed blade. The oscillating strike-off includes a strike-off blade having a vertically oriented front face and a horizontally oriented lower face. Suspension means maintains the desired orientation of the front and lower faces of the strike-off blade, maintains the strike-off blade at a fixed vertical position with respect to the screed blade, and enables the strike-off blade to be laterally displaced within a horizontal plane. Means is provided to laterally reciprocate the strike-off blade with respect to the stationary, vibrating screed blade.

Extendable screed and method for paving non-coplanar road surface

Abstract: An improved extendable screed for paving non-coplanar road surfaces with a screed having discontinuous strike plate portions which can be adjusted to define two planes of road surface. The screed is divided into two portions, each comprised of two parts reversibly held together with bolts. The portions may be lengthened by insertion of an extension section in one or both portions. A support system is provided which will allow the support arms of the screed and the pulling vehicle to be connected even though the extended screed is wider than the tractor. The screed and associated support system may be used in a method for paving non-coplanar roads by orienting the screed division-line in line with the center-line of the crown of the road while the center-line of the tractor, corresponding to the center-line of the screw-augers which distribute the paving material to the screed, is oriented with the center-line of the screed, so the augers more evenly draw paving material from each of the paver feeders.

Cement screed tool

Abstract: A cement screed tool includes bracket clamps designed to be attached at each end of a long two-man screed, with pivotable handles being attached to each of the clamps. Operators can grip each combined handle and bracket assembly with both hands while standing sideways to the screed, inasmuch as the pivotable handle arrangement includes a pair of spaced-apart hand grips. One of the hand grips is positioned above and the other hand grip is positioned rearwardly of the screed, with selective pivoting of the handles then being permitted by the operators. The specific positioning of the hand grips relative to the screed board facilitates an accurate and efficient control of the screed by an operator.

Method of producing a cavity floor

Abstract: The invention relates to a method of producing a cavity floor by using prefabricated shuttering units which are supported on the underfloor and are intended for applying a screed composition, which is temporarily flowable and can harden later, onto these units. Since, as a result of the unit spacing of the shuttering units, gaps often appear between the outer units of the shuttering assembly and the side walls of the room, the invention proposes to fill the gaps by means of shaped parts consisting of a material which can be easily cut through. Since the shaped-part material can be easily worked, the shaped parts can be easily produced in the required dimensions on the building site, and cutouts can also be provided in the shaped parts for subsequently passing installations, laid in the cavity, to the side walls of the room.

Device for ventilating rooms

Abstract: A description is given of a device for ventilating rooms, having a fresh-air supply in the region of the floor. The floor is designed as a so-called double floor, that is to say the screed layer (4) is supported via feet (3) on a basic floor structure (1). Between the feet there are cavities (6) which are connected to one another over the entire floor surface. Fresh air is supplied through the cavities to the room above the floor. For this purpose, the expansion strips between the screed layer and the adjoining room wall (2) are provided with passages for the fresh air. The expansion strips comprise a film band (7) and vertical foam strips (8) which are arranged at a mutual distance from each other, with the result that they form ducts for the passage of air.

Heat insulation between a floor screed layer and its underlying surface

Abstract: A description is given of a heat insulation between a screed layer (2), designed on the underside with cavities, of a floor and a basic floor structure (1) serving as underlying surface for the screed layer. The cavities (4) are formed between feet (3) which are located on the underside of the screed layer and are distributed over the surface of the screed layer. At least one foil (6) is provided which is impermeable to air and, in the region of the cavities, forms an air cushion between itself and the basic floor structure. The foil is braced between the feet of the screed layer and the basic floor structure. In the region of the cavities, it is arched upwards and it possesses sufficient stability for it to be at least self-supporting.

Process for producing a flooring on an uncovered wood joist floor

Abstract: Summary: a thin, elastic insulating layer consisting of foam, rigid polystyrene foam or rubber is laid out on the uncovered wood joist floor. Strips which are the same thickness as the mould-weighting plates are connected to one another in the form of a grid on said insulating layer. These casting moulds are covered with a sheet and filled with a suitable weighting material. Any chosen screed structure is then provided on the weighting plates.

Floating screed floor

Abstract: The floating screed floor, which can be assembled from prefabricated screed-floor slabs (10), has a screed layer (24) of non-uniform thickness which is produced by projections (17) and depressions (22) on the upper side of a textured insulating slab (15) onto which the screed layer (24) is applied. As a result of the varying thickness of the screed layer (24) and the distribution of the thickness regions of this layer, the edges of the screed floor are prevented from bending during setting and drying-out of the screed layer (24).

Apparatus for producing flowing screed

Abstract: A mixing machine which can be filled with ready-made dry mortar from a silo via a conveying means has a mixing container on which a water-metering means is connected and which is equipped with a level indicator which, when a predetermined level has been reached, stops the conveying means which supplies the ready-made dry mortar As a result, even when the supply of ready-made dry mortar is not constant with respect to time and without complex weighing, the water/ready-made dry mortar value, which is decisive for the quality of the flowing screed, remains constant with a very low tolerance

Surface heating system

Abstract: A heating system, which is operated using electrical power, for concrete surface structures is described, in the case of which the heating conductors are not laid in the screed as in the past, but are embedded in the surface concrete. In the case of construction as a floor heating system, the heat-insulating layer is arranged underneath the surface concrete, on a lost shell. In this way, the fantastically large storage capability of the concrete can be utilised so that the consumption of electricity can largely be limited to the low-tariff times, and a flat heating curve is achieved so that it is possible to operate at temperatures which are only slightly above the desired room temperature. Further advantages include a low connected load and a virtually unlimited life of the heating conductors.

Rapid plastering screed

Abstract: The invention is constituted by a rapid plastering screed with the aid of which walls can be plastered more rapidly and precisely than without screeds of this type. It differs from other rapid plastering screeds in that it comprises a lower part and an upper part, and in that the upper part can be separated from the lower part. As a result, it is possible to pull the upper part out of the wall, after plastering the wall, and to cover the lower part with plastering mortar. Moreover, broken plaster edges with corner protection can be produced by means of the lower part, when the latter is fitted diagonally.

Innovations in variable width asphalt paving

Abstract: The self-extending screed is a significant breakthrough in asphalt paving. It provides a more economic benefit by eliminating the costly task of adding and removing hard, rigid screed extension for most paving widths. It also provides new job flexibility by affording instant, infinitely variable width changes in addition to easy extension sloping, maximizing the versatility of the asphalt paver. Above all, the heated, vibrated extensions produce a quality end product with the same texture and uniform compaction as provided by hard extensions. While affording these positive advantages, there is a need to develop a better understanding of the self-extending screed's operating characteristics so that this innovative, new tool can be fully utilized to its maximum potential. It is hoped that this paper has led to a better understanding of some of the self-extending screed's functions and that it hopefully has answered some questions, or better, raised some new questions that can be further explored. (TRRL/Author)