Showing papers on "Screed published in 2001"

Exterior wall sealing system

Abstract: A system for sealing the gaps that occur along the perimeter of a building envelope, particularly along with installation of an exterior finish system channel, or screed, as occurs in the installation and application of stucco It is common to have gaps occur between the channel, base plate, and foundation of the building envelope The system utilizes a foam sealing element in combination with the channel, caulking, a fiberglass netting that is installed along the bottom of the channel and the face of the foundation, and, an adhesive sealant that seals and adheres the fiberglass netting to the foundation The system includes several embodiments for use in either new construction or as an aftermarket product

Paver having adjustable screed angle using a tamper bar

Abstract: A paver has a chassis and a trailing floating screed which is articulated on the chassis by a pair of tension arms. The setting angle of the screed relative to the ground is capable of being adjusted via actuating cylinders. The screed includes at least one tamper bar that is movable in upward and downward directions by a drive and having a variable number of strokes. Further, the screed has a bottom-side smoothing plate. At least one sensor configured for measuring the setting angle is provided in the vicinity of the rear end of the screed. The sensor is connected to an associated controller which is capable of adjusting the number of strokes or stroke rate of the tamper bar in order to adjust the setting angle of the screed to a predetermined desired value.

Method and apparatus for electrically heating a screed assembly in a paving machine

Abstract: A paving machine (20) employs an electrically heated screed assembly (30) to uniformly heat a screed plate (46) of the machine. Uniform heating is achieved by inserting a thermally conductive plate (62) between electrical heating elements (60) and the screed plate (46). An insulation layer (68) may be provided above the heating elements (60) to direct the heat downward into the thermally conductive plate (62). The heat spreads relatively uniformly throughout the termally conductive plate (62), thereby uniformly heating the screed plate (46). A clamping mechanism (74) is also provided that, when tightened, provides a compressive force, thereby holding the assembly in place. When released, the pressure is alleviated, thus permitting a heating element to be removed for repair or replacement without the need to remove the screed plate.

Streamlined weep screed

Abstract: A weep screed for use in exterior construction has a vertical member and upper and lower outwardly projecting flanges affixed to the vertical member. The vertical member is adapted to be form-fit to the base of a vertical wall overlying a concrete foundation. The upper outwardly projecting flange is coextensive with the length of the screed and has a plurality of apertures therein, the apertures being spaced from one another along the length of the weep screed to provide drainage for water accumulating on an upper surface of the upper outwardly projecting flange. The lower outwardly projecting flange, which is coextensive in length with the upper outwardly projecting flange, is impermeable to water. The lower flange collects water received from the upper member and directs the flow of such water outwardly, away from the vertical wall and foundation. The weep screed permits the placement of plaster, stucco or other siding material to be placed in contact with the weep screed both above and below the outwardly projecting flanges, leaving a streamlined gap therebetween. The weep screed directs water that penetrates a plaster layer of a wall to flow away from the wall above ground level. In addition, the weep screed can provide an expansion joint between a concrete foundation or slab and wood framing. The weep screed can be fabricated from any malleable water-impermeable material.

Apparatus for tamping paving material

Abstract: The present invention is directed to an apparatus that tampers paving material and distributes the paving material evenly across a screed plate before the paving material is leveled by the screed plate. The apparatus includes a tamper bar for compacting material, a drive connected to the tamper bar, and a biasing member. The drive intermittently forces the tamper bar downward into contact with the paving material at a desired speed and to a desired depth. The biasing member is connected to the tamper bar and biases the tamper bar upward against the drive such that the biasing member raises the tamper bar out of contact with the paving surface after the drive forces the tamper bar downward.

Screed assembly with improved sensitivity and response to varying surface conditions

Abstract: A screed assembly for use with a prime mover adapted to be moved over a surface to distribute material on the surface. The assembly comprises a prime mover, a screed platform having a screed plate forming a bottom surface thereof and first and second sets of tow arms operably coupled between the prime mover and the screed platform. The tow arms of each set are pivotally coupled with the prime mover and the screed platform and the pivotal coupling of one arm is vertically spaced from the pivotal coupling of the other arm of the same set. Depending upon the dynamics of the paving operation being performed, the tow arms of each set may be in a crossed or a non-crossed orientation to provide positive control of the angle of attack of the screed plate relative to the tow angle. A method of maintaining a substantially uniform depth of a material being spread over a surface by a screed is also contemplated by the invention.

Screed for a paver

Abstract: A paver screed has a main screed with two outer side walls, at least one of the side walls being provided with insertion orifices for the releasable mounting of at least one lateral screed extension by means of fastening elements capable of being inserted through the insertion orifices. A screed extension has fastening elements that comprise hydraulic cylinders which each have a piston that is spring-biased into an initial, retracted position. The cylinders are actuated by hydraulic fluid to displace or extend the piston against the biasing action of the spring. Preferably, the hydraulic cylinders are connected a hydraulic circuit of the main screed. The piston of each hydraulic cylinder carries a shank capable of being inserted through a proximal insertion orifice and which are preferably provided with an abutment element configured for attaching the cylinder to the sidewall of the main screed.

Paving thickness controlling device of asphalt finisher and asphalt finisher and paving execution system

Abstract: PROBLEM TO BE SOLVED: To detect a paving thickness with high accuracy without being influence on work environment to ensure a useful and a predetermined paving thickness. SOLUTION: An asphalt finisher adjusting the paving thickness by changing a height and an inclination of a screed 3 provided backward of the body 1 includes a plurality of electro-optical distance measurement devices 18 and 19 provided along the traveling direction of at least one side of the screed at a predetermined interval and the paving thickness adjusting section 10 adjusting the height and the inclination of the screed so that the paving thickness can be calculated from a difference of the distance to the ground surface obtained by the electro-optical distance measurement devices and that the calculated paving thickness can become a predetermined value. COPYRIGHT: (C)2003,JPO

A general description of flow-applied floor screeds-an important application for complex formulations based on CAC

Abstract: This paper gives a general description of flow-applied screeds, where and how they are used, the performance requirements, and a description of how typical flow applied screeds are formulated. A screed is defined as a layer of well-compacted material applied in-situ to a structural base, or other substrate, finished to a designated level. One of its primary functions is to provide a flat, smooth, sound surface at the correct level to receive another flooring material such as carpet, vinyl, and tiles. This can be achieved using many different types of screed. However in recent years, particularly in Europe, flow-applied screeds have largely replaced traditional screeding methods and materials. These are self levelling, self smoothing screeds that provide the important benefit of speed and ease of application. Many flow-applied screeds are formulated on calcium aluminate cement (CAC) based binders. The formulation of these products, however, is complex and these products will often contain greater than ten components in order to achieve the requisite properties. This paper describes by way of background the function and requirements of floor screeds and in more detail covers the different components used to formulate flow-applied screeds and identifies the performance properties affected.

Motor grader having material distribution attachment

Abstract: A motor grader can be adapted for laying down a layer of granular material such as base rock or cold mix asphalt by mounting a dispensing hopper attachment onto the front of the motor grader and a spreading and leveling screed onto the moldboard. As the motor grader advances, it pushes a dump truck that continuously loads materials into the hopper. Those materials are in turn continuously discharged at a metered rate of flow through the bottom of the hopper and onto the roadbed. The resulting swath of materials passes between the front wheels of the grader as the grader continues to advance, whereupon the screed engages the swath and spreads the materials in opposite lateral directions while leveling them to the desired depth. The screed has swept-back wings that may be extended as necessary to adjust the overall width of the screed, and outboard shields on the outermost ends of the wings confine the spread materials to the roadbed and prevent their accidental discharge into ditches and the like alongside the roadbed. The crown of the deposited layer can be varied by tipping the nose of the screed upwardly or downwardly to the extent necessary or desired.

Straw bale wall vent box and venting system

Abstract: A straw bale wall vent box is provided in a wall joinery system comprising a lower member, a substantially planar top member, and a plurality of rebar disposed through the top member and a bottom side of the lower member. The lower member can further include insulation, a drainage floor sloping downwardly from an exterior side, and a trim piece extending from the bottom side towards the plaster screed. In some embodiments the trim piece joins the plaster screed. In those embodiments in which the trim piece joins the plaster screed, both sides of the lower member can each include at least one aperture. Additional embodiments are directed to a straw bale wall vent system comprising a plurality of wall vent boxes placed side by side so that the first and second sides of adjacent vent boxes are substantially in contact.

Height control arrangement for a strike-off plate

Abstract: A height control arrangement for a strike-off plate of an asphalt paver screed assembly is disclosed. The screed assembly has at least one main screed unit and at least one screed extension unit mounted in front of the main screed unit. The height control arrangement includes an actuator connected with the strike-off plate mounted in front of the main screed unit at a position ahead of the screed extension unit. A sensor measures the amount of material built up behind the strike off plate and sends an input signal to a controller responsive to the amount of material. The controller sends a control signal to the actuator to adjust the height of the strike off plate responsive to the magnitude of the input signal.

Control method for pavement thickness and apparatus using the same for simultaneous paving of a plurality of layers

Abstract: PROBLEM TO BE SOLVED: To easily detect the exact pavement thickness of an upper layer in a pavement work of paving a plurality of layers simultaneously in order to reduce the loss of pavement materials for the upper layer, thus reducing material costs and improving the finishing work of the pavement in spite of a complicated pavement design and an inferior construction environment SOLUTION: Two layers consisting of the upper layer and a lower layer are paved during one paving process using a screed 40 for the upper layer and a screed 60 for the lower layer In the pavement work, the height of the screed 60 from a base line is detected, and the height difference between the pavement surface of the screed 40 and that of the screed 60 is detected Then, the position of the screed 60 is adjusted to a prescribed height, and the position of the screed 40 is adjusted so that the value of the above height difference becomes a prescribed one

A reduced thickness underfloor heating system and a method of installing the same

Abstract: An underfloor heating system 2 has an impervious insulating base layer 4 for laying on a substrate, pipe retention means 14 on the base layer, one or more pipes 8 secured to the base layer and a screed layer 18 overlying the base layer and pipes. The base layer may be formed of interconnectable sections and the pipes may be routed through upstanding nodules provided at spaced apart intervals on the base layer. The screed may be of anhydrite, and may be pumped onto the base layer. A leak proof edging in the form of a polythene flap or foam strip (40, fig 4) may be used to retain the pumped screed within the required area.

Apparatus and method for cold paving

Abstract: An apparatus for spreading, screeding and/or compacting cold paving material to a surface to be paved including a frame of a width substantially equal to the width of the surfaced to be paved. The frame has first and second sides that define the width of the frame. The apparatus includes a pile breaker that has one or more pile breaking rollers that are shorter than the full width of the frame and are connected to the frame. Behind the pile breaker, there is a height-adjustable screed roller for screeding the paving material. There may also be a compacting roller behind the screeding roller to compact the paving material. The cold paving material can be cold asphaltic mixture or similar material, Portland cement concrete or similar material or other paving material at ambient temperature.

Burner assembly for heating a screed plate of a paving machine

Abstract: A burner assembly for heating a screed plate of a screed assembly connected to a frame of a paving machine. The screed assembly includes a heating chamber adjacent to the screed plate. The burner assembly includes a blower that moves air into the heating chamber, and a fuel injection system including a fuel valve. The fuel injection system introduces fuel to the heating chamber. The burner assembly further includes an igniter that ignites the fuel to produce a flame, a thermocouple positioned within an expected flame path, and a controller. The thermocouple generates a thermocouple voltage having a relationship to a temperature surrounding a junction of the thermocouple, and the controller operates the fuel valve based in part on the thermocouple voltage.

Truss screed with covered vibrator shaft

Abstract: A truss screed includes a shaft guard that covers the screed's exciter shaft to protect it from concrete and debris and that protects the surroundings from the rotating exciter shaft. The shaft guard includes a plurality of tubing sections that surround the shaft and that are supported on joints disposed between the guard sections. In a first preferred embodiment of the shaft guard, each joint includes a resilient spring ring, a support cup that receives the spring ring and an end of an associated tubular section, and a bearing that engages the support cup and that supports the joint and a portion of the exciter shaft on the screed's frame. In a second preferred embodiment, each joint includes a support cup that supports an end of the associated tubular section, a bearing, and a U-shaped bracket that couples the support cup to the bearing. The bearing and/or the bracket have elongated slots therethrough for accommodating misalignment of joint components. Joints located at a juncture between adjacent screed sections also include a cup guide that bears the associated support cup while permitting limited tilting movement of the support cup relative to the bearing. Hence, both types of joint accommodate component misalignment, provide an at least limited seal, and permit adjustment of the angular orientation of adjacent screed sections relative to one another.

Concrete placing, leveling, and compacting device

Abstract: PROBLEM TO BE SOLVED: To provide a device capable of automatically placing, leveling, and compacting concrete. SOLUTION: A hopper 21 for holding concrete is provided at the rear of a vehicle 1. A screw conveyor device 3 is disposed at the lower part of the discharge port of the hopper 21. A screed base 22 having a vibrator or a tamper device 23 is provided at the rear of the screw conveyor device 3. The vehicle 1 is moved forward, and the screw conveyor device 3 and the vibrator or tamper device 23 are driven to continuously input concrete into the hopper 21. The screw conveyor device 3 places and uniforms concrete by spreading in the direction orthogonal to the advancing direction, and the concrete is compacted by the vibrating screed base. As a result, the concrete is deposited in band shape. By continuously inputting concrete in the hopper 21, a concrete depositing placed, spread, and compacted automatically can be performed.

Apparatus and method for finishing concrete during a leveling process

Abstract: A method and apparatus for leveling and smoothing the surface of wet concrete mix to provide a smooth finish surface relatively unobstructed by pebbles and the like, in which a screed blade is first pulled over the wet mix, a perforated drum or roller is pulled behind the screed blade, and both the blade and the drum are concurrently vibrated in a vibratory motion.

Control system and method for controlling a screed head

Abstract: A control system controls movement of individual hydraulically moveable ends of a screed head carried by a boom of a machine so as to maintain a selected elevational position between each end of the screed head and a reference in a concrete paving application. One of a pair of elevation receivers is mounted at each end of the screed head, providing a first and second signals indicating the position of the first and second ends of the screed head in relation to the reference. A sensor, mounted on the screed head, senses the orientation of the screed head along its length from the first end to the second end and providing a third signal indicating such orientation. A control circuit, responsive to the elevation receivers and to the sensor, controls the hydraulically moveable ends of the screed head using the first and second signals from the elevation receivers when the first and second signals are available, and controls the hydraulically movable ends of the screed head using the third signal from the sensor and one of the first and second signals from the elevation receivers when the other of the first and second signals is not available.

Screed plate interlock

Abstract: The screed assembly includes a screed plate and a screed frame. The screed plate includes a notch and the screed frame includes a tab that is inserted into the notch on the screed frame such that only screed plates and screed frames which include proper mating notches and tabs may be assembled together on road paving machines. In a preferred form of the invention, the width of the tab is approximately equal to the width of the notch to prevent lateral movement of the screed plate with respect to the screed frame when the screed plate is subjected to lateral impacts and forces during operation of the road paving machine.

Screed device of paving vehicle such as asphalt finisher or the like

Abstract: PROBLEM TO BE SOLVED: To eliminate a dragging trouble on a pavement face in the construction work and prevent the asphalt component in an asphalt mixture which has intruded into the slide face of the screed plate from sticking to the pavement face and further, prevent a screed device of a paving vehicle such as a finisher or the like from becoming vertically immovable when restarting by making it possible to heat a tamper edge or a pressure bar. SOLUTION: A screed plate 2 is heated by hot air heated by a burner. The front and rear ends of the screed plate 2 are vertically separated from the front and rear ends of the screed frame 1 and connected to each other by bolts 3. The space between the ends of the screed plate 2 and the screed frame 1 is hermetically sealed by a flat bar 12 or the like to form a space through which the hot air passes to the front and rear ends of the screed plate 2 and make it possible to uniformize the temperature difference in the front and rear directions of the screed plate 2 from the font end to the rear end. Further, the tamper edge 4 and the pressure bar can be heated by the thermal conduction.

Material anti-segregation curtain for a paver

Abstract: An anti-segregation device (10) for preventing segregation of paving material (P) that is applied to a road bed (7) by a paving vehicle (1). The anti-segregation device (10) includes a first end (14) that is connected with the frame (2) of the paving vehicle (1) and an opposing end (16) proximal to the road bed (7). The anti-segregation device (10) is configured to substantially contain paving material (P) between the anti-segregation device (10) and a screed (3) on the paving vehicle (1). The anti-segregation device (10) substantially prevents larger material particles from falling, rolling or otherwise moving forwardly from the remainder of the paving material head (H) so as to generally prevent material segregation.

Screed device for road paving vehicle

Abstract: PROBLEM TO BE SOLVED: To facilitate adjustment of a gap between a molded board and a road face when the pavement width of a screed device of a road paving vehicle is changed and avoid suspension of a paving workand secure safety in the adjusting work. SOLUTION: An edge 24 is attached in the vicinity of the lower end of a molded board 22 so as to be vertically movable, and a bar 31 is provided on the upper part of the molded board 22 so as to be transferable breadthwise. A plate 33 rotatable around a pin 32 is pivoted. One end of the plate 33 is connected to the bar 31 by a pin 35, and the other end of the plate 33 is connected to an arm 24a in the edge by a pin 36. When shifting the bar 31 breadthwise, the plate 33 is rotated and the edge 24 is vertically moved, hence, the gap between the edge 24 and the road face can be adjusted.

Method of surfacing a road

Abstract: of EP0693591A 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.

Metering and leveling screed device

Abstract: The present invention is directed to a screed assembly that includes a strike-off. This strike-off is directly connected to a screed plate such that the strike-off is able to bend or twist along with movement of the screed plate which occurs during a paving operation. The strike-off in the screed assembly of the present invention is simpler and less costly to manufacture than corresponding devices in existing screed assemblies. Connecting the strike-off directly to the screed establishes a shearing height prior to mounting the screed assembly to the paving machine in set up of the screed assembly faster and easier to accomplish.

Paving method and device for finisher and also slope

Abstract: PROBLEM TO BE SOLVED: To provide a paving method and device for a finisher and also a slope which prevents a level difference between the level of a pavement made at the front side by a screed and the lever of a pavement made at the rear side by the screed even when there is a big change in longitudinal gradient in pavement sections and which prevents uneven compaction density in slope pavement. SOLUTION: This finisher 1 comprises a screed 11 consisting of a body screed 11a towed by a vehicle body and an expansible screed 11b provided in parallel behind the body screed for movement in the cross direction, an expansible screed moving means for moving the expansible screed in the cross direction, a level measuring means (ultrasonic level sensor 12) for measuring the level of a pavement plane made by the body screed, an inclination measuring means (inclinometer 13) for measuring the inclination of the pavement plane, and a levelling means 14 for adjusting the level and working angle of the expansible screed at a real time in accordance with the measurement results of the level measuring means and the inclination measuring means.

Dynamics Analysis of Screeding Unit for Asphalt Paver

Abstract: The paving process of asphalt paver and the action between mixture and screed are analyzed in order to solve the problems in kinematics model of screeding unit. The touching area of the screed is not always the whole plate, may be parts of the plate. So it is changeable. Based on the fact, the dynamics model is deduced.