Showing papers on "Screed published in 1995"

Paving machine having automatic metering screed control

Abstract: A paving machine having a sensor-controlled concrete metering screed. The machine includes hydraulic cylinders which move the metering screed to various elevations to control the depth of concrete being metered out by the screed. At least one ultrasonic sensor is slide-mounted to the machine above and behind the metering screed to provide measurements of the distance between the sensor and the surface of the concrete just behind the screed. A control system compares the sensor measurements with a tolerance range of distances corresponding to the desired depth of concrete. When the sensor measurements are out of tolerance, the control system moves the metering screed up or down to bring the distance, and the metered depth of concrete, back within tolerance.

Screed control system for an asphalt paver and method of use

Abstract: In one aspect of the present invention, a control system for a floating screed assembly for an asphalt paving machine is disclosed. The screed assembly includes a main screed and extension screed unit. An electrohydraulic device extends and retracts, as well as, raises and lowers the extension screed unit relative to the main screed unit. The electrohydraulic device additionally pivots the extension screed unit relative to the main screed unit about a horizontal axis. Position sensors produce position signals in response to the position of the extension screed unit. A controller receives the position signals and produces command signals to control the extending, retracting, and pivoting of the extension screed unit to a desired position.

Portable vibratory wet screed

Abstract: An extremely light-weight, portable floating power vibratory concrete "Wet Screed", which is hand operated by a single finisher in order to strike off, tamp and smooth freshly poured concrete using only perimeter slab forms or curbs. The unique angular design of the enclosed hollow screed blade allows the operator to lower the handle and effectively use the rear 60 degree angled surface of the screed blade to cut down the height of the concrete to the desired grade, or raise the handle to effectively use the front 60 degree angled surface of the screed blade to float and maintain the desired grade. The flat aluminum bottom extending from the front angled surface to the rear angled surface of the screed blade functions to produce a smooth, near final finish while the vibratory action tamps the rock down and works the fat to the concrete surface, thereby substantially increasing the finishing time while making the finisher's job much easier. With the new invention, it is possible to "Wet Screed" and then finish, in one day, twice the amount now possible by hand and with less labor.

Universal weep screed

Abstract: A weep screed for use in exterior construction has a vertical member, an outwardly projecting member, and an inwardly projecting member which is susceptible of being form-fit to a concrete foundation. The inwardly projecting member has a plurality of grooves or notches running along the length of the weep screed to provide tear strips, to permit adjustability of the length of the inwardly projecting member by allowing it to be torn off, or to permit bending of the inwardly projecting member for a form fit with the foundation where a flush fit occurs at a point in between tear strips.

Offset screed system and quick connect mounting therefore

Abstract: A laser controlled automatic grade control system for finishing plastic concrete mounts the finishing tool behind the support towers to resist furrowing. The system functions with a variety of elongated, multi-section concrete finishing tools such as triangular truss screeds or the like, all of which can be quick connected or disconnected from the tower system. Skis that support the device facilitate sliding, winch-driven movement over and through plastic concrete. Spaced apart, vertically upwardly extending towers support the device along the length of the finishing tool. The towers are cylinder-adjustable in length. Cylinder extension and retraction are governed by a sensor-controlled system that is laser operated. The sensors respond to a preestablished laser beacon to control finishing tool elevation as the device traverses the pour in response to its winches.

Apparatus and method for controlling the material feed system of a paver

Abstract: An apparatus for controlling a material feed system of a paver is disclosed. The material feed system includes a feeder conveyor and a spreader auger. The apparatus includes a sensor that monitors the amount of material at the edge of the screed and responsively produces an actual material height signal. A rotary switch produces a desired material height signal indicative of a desired amount of material at the edge of the screed. A controller receives the actual and desired material height signals, determines a desired rotational speed of the auger in response to the difference between the signal magnitudes, and produces a command signal to rotate the auger at the desired speed. An electrohydraulic system receives the command signal and rotates the auger at the desired rotational speed.

Asphalt fume reduction system

Abstract: A paver or other apparatus used to convey paving material is provided with a conduit including a hood and a duct for directing fumes from the paving material to a fume processor. A paver having an extendable screed or other moving parts is equipped with a roll of screen material. The screen material is unrolled and fastened over the extended screed to contain and direct the fumes to the conduit. The fumes are burned in an engine of the paver or otherwise processed to remove or reduce noxious components thereof.

Screed bar attachment

Abstract: An attachment for a screed bar which is used to level concrete in concrete forms wherein the screed bar is operated by two individuals who place the bar on the concrete forms and then move it back and forth along the forms to level the concrete after it has been freshly poured into the forms, the attachment comprising an inverted U-shaped member attached adjacent each end of the screed bar, each member having a pair of parallel plates extending outwardly and upwardly therefrom at an angle of about 70° with respect to the vertical, a handle pivotally connected between each pair of parallel plates and extending outwardly and pivotally from each member, whereby the individuals can grasp the handles and move the screed bar over the forms and the concrete therein without having to stoop over.

Apparatus for supporting a tile counter cap

Abstract: In a tile covered structure, the improvement being a corner tile support strip attached between the vertical surface and the vertical leg sections of the corner tiles which includes an "L-shaped" first main body screed and an elongated rectangular stress barrier member with the stress barrier member being attached to the screed by caulking.

Hand-held screed for sidewalks

Abstract: A hand-held screed for use in making a sidewalk includes a rectangular plate. The plate has a bottom edge suitable for subgrading and for levelling concrete, and a top edge opposite the bottom edge. At either end of the plate, a projection extends beyond the top edge. A handle is affixed to one of the major surfaces of the plate and is braced by a pair of struts. The plate has a width, as measured between the top and bottom edges, equal to the intended depth of the sidewalk. The plate further has a length equal to the intended width of the sidewalk. A form is erected and the area within the form is subgraded using the bottom edge of the plate. The plate is oriented with its length dimension running widthwise of the form. When the top edge of the plate is flush with the top edges of the form, the depth of the area within the form equals the intended depth of the sidewalk. Concrete is now poured into the form and the wet concrete is subsequently levelled using the bottom edge of the plate. The plate is again oriented with its length dimension running widthwise of the form. After levelling, the plate is inverted and control joints are laid using the projections.

Method and apparatus for automatically controlling the temperature of an asphalt paver screed

Abstract: In one aspect of the present invention, an automatic screed temperature control is disclosed. The control senses the screed temperature and compares the screed temperature to a lower set point. In response to the screed temperature being less than the lower set point, the control causes fuel to dispense into the combustion chamber and subsequently causes the fuel to ignite in order to heat the screed. The screed is heated until the screed temperature becomes greater than an upper set point.

Triple roller tube concrete finisher

Abstract: A triple roller tube concrete finisher that uses rotating tubes to strike-off, screed and finish concrete. The machine rides upon concrete forms and comprises a box-like, generally parallelepiped, frame supported by a plurality of rotary rollers. The frame houses an engine, cleaning system and a hydraulic system. The engine powers the hydraulic system that rotates the rollers. Two of the rollers provide locomotion to the machine while simultaneously screeding and finishing concrete the machine moves over. Preferably, these drive rollers are bidirectional to facilitate forward and rearward movement of the finishing machine. One of the rollers functions like a strike-off to prevent ride up. This roller rotates counter to the drive rollers to grade and displace excess unlevel concrete away from the leading edge of the machine. Preferably, the vertical height of the strike-off roller and its axis of rotation may be adjusted to vary the resulting depth of the concrete passing thereunder. A pivoting housing attaches the strike-off roller to the frame and permits the vertical displacement of the roller. The strike-off roller moves the excess concrete away from the frame, forming an intermediate zone. The drive rollers then compress and screed the intermediate zone to yield a finished slab of compacted concrete. A hydraulically displaceable leg depends from the frame and may be selectively actuated to lift the drive rollers off the forms. An operator controls the rollers and a steering system from a central location.

Self-levelling fluid mortar including calcium sulphate and lime

Abstract: A self-levelling fluid mortar including calcium sulphate, aggregates, lime, water and either a silica and an alumina-containing compound, or a pozzolana, as well as a screed prepared from said fluid mortar, are disclosed. The combined use of lime and either a silica and an alumina-containing compound, or a pozzolana, for increasing the mechanical strength of a screed and reducing its water sensitivity, is also disclosed.

Method and apparatus for discharging paving materials on top of distributing auger

Abstract: A paving machine discharges HMA or other paving materials directly on top of a distributing auger located between the paving material storage hopper and the screed. The distributing auger is then capable of remixing any partially segregated paving materials and of uniformly distributing the paving materials directly adjacent a previously-paved segment. Materials may be discharged on top of the distributing auger from a discharge opening of a gravity feed hopper located adjacent the distributing auger or from an inclined conveyor delivering materials from a more standard hopper mounted near the front end of the paving machine.

Holding rail intended for heating pipes of a floor heating system (underfloor heating system)

Abstract: In the case of shallow screed, the openings for receiving the heating pipes would have to come closer than hitherto customary to the web of the holding rail. The finishing of an initially extruded holding rail is all the more difficult the closer the openings for receiving the heating pipes come to the web of the holding rail, because when the openings are punched out the abutment belonging to the punching tool might break off. The new holding rail is to be designed in such a way that there is no risk whatsoever of damage to the abutment when the openings are punched out. The openings (27; 37) reach as far as the web (11) of the holding rail (10) and are substantially rectangular in cross-section. The openings exhibit a narrowing in their region remote from the web (11) by way of protruding holding lugs (29; 39). Compared with what is known, the holding rail (10) has the advantages that the punching-out of the openings (27; 37) for receiving the heating pipes (15) is readily possible without an abutment belonging to the punching tool possibly breaking off, since there is no abutment necessary at all in the region of the openings (27; 37) for the punching-out. There is, however, also no risk of the plastic material on the holding rail (10) breaking off.

Paving machine for paving thin layer of resin system color pavement material

Abstract: PURPOSE:To increase workability by laminating a non-adhesive board at a specified position, providing a heating means to prevent the paved material from adhering, and also providing a stamping and a sizing means. CONSTITUTION:A board of ultra-high polymer polyethylene, etc. is laminated on a hopper 3, a feeder 4, and a screw scraper 5 to prevent adhesive resin system color pavement material 20 from adhering, and the material 20 is fed smoothly to make it even. Next the material 20 is stamped by a screed plate 8 excited by an exciting machine 21 to a specified thickness. Also the paved thickness is specified mechanically by the height of a sky 22 of the plate 8, and falling out of the material in lateral direction is also prevented by the sky 22. Then a roller is provided at the rear of the plate 8 to eliminate the material 20 adhered to the rear end of the plate 8 and finish the paved surface by rubbing. In addition, the plate 8 is kept at a specified temperature to lower the adhesiveness of the material 20. Thus the material can be made scraped even, and a series of operations can be mechanized to save labor.

Self-leveling fluid mortar including calcium sulfate and lime

Abstract: The invention relates to a self-levelling fluid mortar including calcium sulphate, granulates, lime, water and either a silica and a compound containing alumina or a pozzuolana, and to a screed obtained from said fluid mortar. It also relates to the combined use of lime and either of a silica and of a compound containing alumina or a pozzuolana to increase the mechanical strength and reduce the water sensitivity of a screed.

Screed device for paving machine and the like

Abstract: PURPOSE:To make a maximum paving width twice or more the width of a main screed by a simple operation in a screed device of a paving machine. CONSTITUTION:At least two telescopic screeds 16, 16-which are extendible and retractable in left and right directions with respect to a main screed 12 and wherein the width of each of the screeds is made 1/2 or less times as large as the width of the main screed 12 are provided in each direction. The screeds 16, 16' are extended or retracted by operating a hydraulic cylinders 18, 18' at least in two stages so that a screed width thereof can be made twice or more as large as the width of the screed 12 in a maximumly extended state. Even if the maximum screed width is larger than twice as large as the width of the screed 12, the screeds 16, 16' in retracted state can be put within the width of the screed 12, and hence a large-sized railor is not needed in transportation so that transportation cost can be reduced.

Process for striking off plaster applied on door or window reveals, and guide therefor

Abstract: The invention relates to a process for striking off plaster applied on door or window reveals, a guide being fastened on that surface of the frame of the door or of the window which is directed towards the reveal, and a screed being guided, during the striking-off operation, along said guide by means of an end-side region of its striking-off edge; and to a guide for guiding a screed in the region of door and/or window reveals, comprising a profile with a first, planar surface for resting against the frame of a door or of a window and with a surface which is approximately at right angles to said first, planar surface and is intended for guiding the screed.

Surfacing apparatus and method

Abstract: A road-surfacing vehicle comprises means for applying a surfacing composition to the road as the vehicle moves, and a screed (2) that essentially defines the contour of the surface, wherein the screed (2) is movable relative to the vehicle and opposite to the vehicle's direction of movement during application.

Device for constructing semi-flexible pavement

Abstract: PURPOSE:To improve a filling factor of cement milk by scattering cement milk directly before a first screed to immediately perform the filling thereof by means of a plate-shaped vibrator and drawing out air successively. CONSTITUTION:Infiltrative cement milk having been mixed by a grout mixer is fed to an agitator 4. A tractor 1 is advanced. And the infiltrative cement milk is scattered directly before a first screed 10 from a delivery port 8. Immediately thereafter, filling of the cement milk is performed by means of a plate- shaped vibrator 14. At the same time, air in the voids of asphalt concrete being a base body is drawn out successively in an advancing direction. Even if the cement milk having been filled flows transversely due to the cross slope of a road, the cement milk having flowed out is scraped up toward the center of the road by a lateral scraper 16. Excessive cement milk after the filling is collected by a rear scraper to be recovered to the agitator 4.

Screed device for paver

Abstract: PURPOSE:To lighten the burden imposed on workers and to improve working efficiency, by a method wherein a side frame for an extendable widener is connected to one end of a piston rod and is positioned so that a deflector for the widener is shifted along the front side of a deflector for an extendable screed. CONSTITUTION:When an extendable widener 58 is extended, an extendable screed 54 is shifted outward in the direction of width together with the extendable widener 58 by an extending or retracting device and is positioned at a specified position. Hydraulic oil compressed is supplied to one chamber in a hydraulic cylinder 64 for the screed 54, and a piston rod 62 is extended outward in the direction of the width. A side frame 76 for the widener 58 is shifted outward in the direction of the width, a member 79 to be guided for the widener 58 is shifted along a guide groove 68 for a guide member 66 of the screed 54, and rod members 80, 82, 84 to be guided for the widener 58 are respectively shifted along corresponding guide members 70, 72, 74 of the screed 54. A deflector 78, of which one end is connected to the side frame 76, is shifted outward in the direction of the width, along the front surface of a deflector 17 for the screed 54, and a slide plate member 90 is also shifted together with the side frame 76 and the rod member 84.

Holding device for heating pipes (tubes)

Abstract: For the installation of a central-heating system in a building, heating pipes are laid on the unfinished floor of the structure and in each case led up to the radiator concerned from below. Until now, it has been possible for the heating pipes to become bent during the laying of the screed. A novel holding device for heating pipes is to be suitable for all distances of radiator connections occurring and various screed heights. A holding bracket (5; 91) has a base part (9; 99) and a rail (8; 98) pointing away therefrom and having a number of openings (10; 100) provided on it in grid fashion. The holding bracket includes a sleeve (12; 102) having at least one or more holding elements (pegs 15; 95) insertable, at the appropriate place as required, into the openings (10; 100) on the rail (8; 98). The rail has either a V-shaped or a substantially rectangular cross-section or is of flat design. it runs substantially perpendicularly to the base part (9; 99). The holding device is suitable for any radiator and any screed height, with the result that its storage is simplified and the selection of a given holder for a given radiator and a given screed height is dispensed with.

Tubular, longitudinally changeable supports which can be fitted in clearances of shuttering slabs of cavity floors

Abstract: Tubular, length-changeable supports which can be fitted in clearances of shuttering slabs of cavity floors and can be filled, via the clearances, with screed which is to be applied on to the shuttering slabs are intended, on the one hand, to be stable, in the non-filled state, under footstep loading and, on the other hand, to be capable of compensating for unevennesses in the unfinished floor on to which the shuttering slabs are laid. For this purpose, the downwardly free end of the supports is provided in each case with a centring collar and an axial stop for the correctly fitting plugging-on of a lengthening sleeve or cap. In each case one deformable region may be provided in the support itself or in the plug-on lengthening sleeve. At least one zone of higher elasticity is arranged within the deformable region. This zone of higher elasticity is stretched out in elongate form in the initial state and can be compressed to a predeterminable minimal longitudinal extent. In this compressed state, which determines the desired distance of the shuttering slab from the unfinished floor, the support can be loaded in an essentially deformation-free manner.

Power crown on asphalt screed

Abstract: A power crown adjustment apparatus for an asphalt screed includes first and second screed subassemblies movable with respect to each other, power apparatus for moving the subassemblies with respect to each other to alter the crown and control apparatus for automatically preventing the first and second screed subassemblies from moving beyond the predetermined range of movement.

Threshold (doorway) strip for floor coverings

Abstract: Single-piece profile section designed to make the connection between two floor coverings, of the threshold strip type. The invention consists of a method for fastening a profile section to the ground using basic products required for laying floor covering, that is to say adhesive or making-good layer of screed. It is composed of a sole which is striated on its underside (1), and designed to be embedded in the making-good screed or the adhesive, positioned in the door casing, of a central body (2) and of two cap-shaped flanges (3-4-5) serving to cover the floor coverings of different heights, set into the cavities (6-7) on either side of the central body. This profile section finds its application in building and renovation work.

Straightedge for the precise alignment of the step height when applying screed or a levelling composition on staircases which have been constructed with concrete or brickwork in a non-uniform manner

Abstract: Straightedge for the precise alignment of the step height when applying screed or a levelling composition on steps which have been constructed with concrete or brickwork in a non-uniform manner. By virtue of individually height-adjustable feet (5, 6) and at least one extension part (4) which can be drawn laterally out of a main part (1), the straightedge can be aligned in the horizontal and/or set to the respective position of the steps.

Vibrating filling plate for road finishing machine

Abstract: PURPOSE: To provide a vibratory screed for a road finisher capable of very strongly compress a material without lifting the rear side of a screed when a specially thin screed layer is formed. CONSTITUTION: In a vibratory screed for a road finisher equipped with a vibratory device 4 having a large-area base plate 16 and provided with a vibration element 17 connected to a vibration drive 19 and a guide plate 12 positioned obliquely towards the base plate 16, a vibration strip 24 is positioned between the guide plate 12 and the base plate 16 provided in the vibration device 4. The vibration strip 24 is connected to the vibration drive 19, and the vibration strip 24 is provided with a run-in slope.

Self-levelling fluid mortar comprising calcium sulphate and lime

Abstract: A self-levelling fluid mortar including calcium sulphate, aggregates, lime, water and either a silica and an alumina-containing compound, or a pozzolana, as well as a screed prepared from said fluid mortar, are disclosed. The combined use of lime and either a silica and an alumina-containing compound, or a pozzolana, for increasing the mechanical strength of a screed and reducing its water sensitivity, is also disclosed.

Refuse-recycling building material

Abstract: To accomplish cost-effectively the recovery of plastics refuse and of other types of refuse which are difficult to put to further use (for instance composite materials), the material of no value and causing storage costs is optimally used as building material. For this purpose, it is often necessary for the refuse to be compacted for it to be able to be used as building material. This compacting could be performed by screening out the smaller parts. Or the material could be reduced in its volume by heat or pressure. Mechanical comminution is often most useful in order for it to be possible to add the refuse to concrete, mortar, wall or ceiling plaster, screed, building blocks, cast stone, road surfacings, asphalt, building slabs, cement, lime or other building material, for it to be re-used for building structures or other objects.