Showing papers on "Screed published in 1992"

Polymer concrete paving machine

Abstract: A self-propelled paver that distributes, consolidates, places and finishes polymer concrete to rapidly resurface roadbeds. A mobile, wheeled chassis mounts an adjustable hopper that receives premixed polymer from a mixer truck that precedes the paver. A finishing assembly secured to the chassis has a distribution assembly for applying concrete transversely across the surface, and a trailing finishing screed that surfaces and densifies the concrete. An active, hydraulic suspension dynamically orients the chassis and the finishing assembly with the roadbed. Individual height adjusting cylinders can be extended or contracted by an automatic grade control that logically senses grade through an external string line. The distribution system comprises an open bottom exposing the surface to be paved, and an open top adapted to receive concrete from a trough extending from the hopper. A bidirectional auger is rotatably disposed within a distribution box for moving concrete upon the surface. The finishing screed comprises a rigid strike off that initially contacts uncompacted concrete laid by the distribution system. An intermediate pan extending between the strike off and a trailing bull float mounts a plurality of vibrators that facilitate concrete densification. The vertically displaceable hopper can be adjusted to an appropriate operative orientation relative to the mixing truck. When tested in place with a nuclear densitometer, resultant concrete density will meet or exceed standards established for all modern paving jobs. Ride quality as measured by a profilograph according to known procedures will meet all established standards.

Tow point for an asphalt paver

Abstract: A tow point (43) for an asphalt paver (15), which allows the operator to: (1) select either a fixed or sliding tow point connection; and (2) select from among several possible locations of each; thereby adjusting the distance between the screed (20) and transverse auger (30) of the paver (15). Combination of these features in a single machine makes it possible to lay down an asphalt mat of uniformly desired thickness, while optimizing use of the aggregate batch particles.

Extendable screed for an asphalt paver

Abstract: An extendable, including screed extensions (20) which extend, retract and pivot relative to the main screed (10). The screed extensions (20) are mounted to the main screed (10) with a zero clearance pivot joint (38). The disclosed pivot joint (38) permits the screed extension (20) to extend, retract and pivot relative to the main screed (10) while maintaining zero clearance at the pivot. The pivot joint (38) includes respective mounting plates (21,28) on the extension screed (20) and the main screed (10) which are adapted for substantial coextensive engagement with each other in a plane perpendicular to the longitudinal axis of the paver (5). A threaded fastener (38) is received in coaxial apertures (36,40) in the mounting plates (21,28) for defining the pivot axis (38) of the extension screed (20) thereby permitting slope adjustment of the extension screed (20) relative to the main screed (10). Tightening of the fastener (38) draws the mounting plates (21,28) in tight engagement with each other thereby establishing the zero clearance pivot joint. This zero clearance pivot joint (38) thereby improves alignment between the main screed sole plate (16) and the extension screed sole plate (24) during paving operations, resulting in a higher quality road surface.

Nelson stud screed post assembly

Abstract: A screed post assembly which may be easily and quickly interfaced to a Nelson stud extending upwardly from a horizontal support beam used in the construction of a building framework. The screed post serves as a support for a screed support system which is used to conduct a leveling operation for a concrete pour during the formation of a composite deck. The screed post assembly is also adapted to be extendable over a rebar member and used in the assembly of a protection device which covers the top, exposed ends of a plurality of linearly aligned, upwardly extending rebar members.

Trench paving device

Abstract: A trench paving device releasably secured to the lower lip of an earth moving bucket on a front end loader. The paving device has a pair of opposing vertically disposed and rearwardly converging side plates and a vertically adjustable screed supported between the rear end portions of the side plates. Skids carried by and projecting outwardly from the side plates support the paving device in straddling relation to a trench to be paved. The paving device moves with the bucket and relative to the front end loader in response to operation of a manually operable control system on the front end loader.

Asphalt finishing screed having rotary compactor

Abstract: An asphalt finishing screed is disclosed which is adapted to achieve essentially complete compaction of the asphalt mix over a range of finished mat thicknesses. The screed comprises a vertically adjustable strike off bar, a rotary compactor positioned immediately behind the bar, and a screed plate positioned immediately behind the rotary compactor. In one preferred embodiment, the rotary compactor comprises a rotor which includes a plurality of freely rotating rollers about the peripheral surface thereof. In operation, the adjustable strike off bar is set at an elevation so as to meter the material to the rotary compactor and to achieve the desired compaction for the particular thickness of the finished mat being laid. The rotary compactor then impacts the mat in an essentially vertical direction and so as to achieve complete compaction of the mix.

Method and apparatus for heating an asphalt paving screed

Abstract: Heat exchange tubes are mounted on the upper face of the sole plates of the main screed and screed extenders on an asphalt paving machine. Hot oil is circulated through the heat exchange tubes to preheat the sole plates. The heating system for the oil includes a pressure drop across a flow restrictor. The heating oil is pressurized by a pump driven by a hydraulic motor supplied with pressurized oil in a second hydraulic circuit from the tractor of the paver. This second circuit is also used to operated the vibratory mechanisms on the screeds after the screeds are preheated.

Paving machine with midline dowel bar insertion

Abstract: A paving machine having a medially located dowel bar feeder positioned in front of a dowel bar inserter. The machine has a screw or paddle for spreading the concrete and a front strike-off to allocate a proper amount of unconsolidated concrete beneath the machine. Next in line, internal vibrators are mounted to the machine to perform a preliminary consolidation of the concrete, followed by a screed to meter out a correct volume of consolidated concrete for a finished concrete slab. To the rear of the screed, the dowel bar feeder drops dowel bars in a predetermined pattern on the top surface of the consolidated concrete. The dowel bar inserter is mounted to the paving machine behind the dowel bar feeder and is adapted to travel between a forward position and a rear position and includes a plurality of vibrating forks which descend to engage the dropped dowel bars and insert the dowels into the unhardened concrete. Behind the dowel bar inserter, the machine includes a center bar inserter, a tube vibrator, a tamping bar, an extrusion pan and a float pan. The paving machine may be adapted to insert dowel bars for transverse joints in a straight or a skewed pattern. In the case of the straight pattern, all the dowel bars for each transverse joint are dropped at the same time. For the skewed pattern, the dowel bars for each transverse joint are dropped one at a time.

Screed assembly for an asphalt paving machine

Abstract: In accordance with one aspect of the present invention, a modular screed assembly attachment for an asphalt paving machine having a main screed unit, includes a support assembly that is detachably connectable to the main screed unit, a movable carriage slidably mounted on the support assembly, and a platform assembly movably connected to the movable carriage. The modular screed assembly attachment also includes means for moving the carriage between a position adjacent the main screed unit and a position spaced from the main screed unit, and means for selectively positioning the platform assembly elevationally with respect to the carriage.

Improvements in or relating to supports for building structures

Abstract: A building method avoiding the use of traditional excavated foundation comprises placing primary support members (10) into the ground in which the structure is to be built at predetermined intervals, spanning the gap between support members (10) by pre-cast reinforced concrete beams (14) of generally inverted T-shape and predetermined length and building, for example, a double skin wall (42,44) on the outer flange (22) and top of the beam while the inner flange (22) supports a floor slab of beams (40) blocks (46) and screed (48) and abuts the inner face (31) of the upright of the beam to resist inward lateral movement thereof.

Positive locking concrete screed rail

Abstract: A screed rail assembly for use in the construction of concrete slabs includes an elongated rail having a plurality of locking members that extend outward from the sides of the rail. The locking members provide a positive mechanical connection between the concrete slab and the screed rail, preventing structural damage due to external forces exerted against the slab. An elongated protective strip extends along the top surface of the elongated rail, further protecting the junction between the slab and the rail from damage due to external forces.

Landscape levelling and raking apparatus

Abstract: A landscape leveling and raking apparatus has a frame, a handle protruding upwardly from the frame, a rake pivotally coupled to the frame to protrude downwardly and rearwardly therefrom, a screed fixed to the frame forwardly of the rake, a plurality of tiller blades rotatably mounted along a forward, open end of the frame, a motor which rotatably drives the tiller blades, and a mechanism for raising or lowering the tiler ,blades relative to the frame. As the blades rotate, they till the soil and propel the apparatus forward. The frame is open along its front edge. This allows soil to accumulate within the frame as the apparatus moves forward. The soil gradually escapes from the frame by passing beneath a screed fixed along the lower rear edge of the frame. The screed levels the soil before it is raked by the tines of the rake.

Screed unit for asphalt paving machine

Abstract: A floating screed for asphalt paving machines has the front edge of its sole plated and bullnose sloping rearwardly from the center to assist lateral flow of the hot asphalt material in front of the main screed and to the front of screed extenders. The bullnose for the sole plate is separate from the sole plate and consists of a pair of bullnose pieces. The construction is such that adjustment of the controlled dishing and warping of the sole plate can be more easily performed.

Finishing method of precast concrete board

Abstract: PURPOSE:To improve workability and productivity by levelling a surface through a screed means and a vibration means to the surface of concrete immediately after concrete is placed in forms, primarily finishing the surface by disc means and secondarily finishing the surface by turning a plurality of blades. CONSTITUTION:When a surface plate 3, to which forms W are fixed, is carried to the section of a concrete placing means 4 in a production line 1, a fixed quantity of kneaded muddy concrete are placed in the forms W. When the surface plate 3 is carried to the section of a levelling means 5, levelling operation is conducted to concrete C placed in the forms W through a screed means 11 and a vibration means 12. A disc 18 for finishing is abutted against the surface of concrete C by specified pushing force in a primary finishing means 7, and the disc 18 for finishing is turned at high speed and the surface of concrete C is primarily finished. A blade disc 20 for finishing is abutted against the surface of concrete C by specified pushing force in a secondary finishing means 8 at the same time, and the blade disc 20 for finishing is rotated at high speed and a surface is secondarily finished.

Heat and sound insulating foamed plastic floor-to-wall edging strip - includes deformable insert pref. of low elasticity plastic, to hold strip close to wall corners, avoiding bulging and damage from floor screed

Abstract: Heat or sound insulating edging strips of foamed plastic, for use between building floor screed and walls, contg. a deformable insert (2), esp. of low elasticity plastic (not further specified). The insert may be in the form of a mesh or cords - the latter permits several adjacent profiles or rods. Alternatively to extrusion, the prepd. insert may be embedded in the strip during foaming or laid between two foam strips, which may then be welded by infra red or hot air heating and pressure. USE/ADVANTAGE - Insert, when bent, prevents significant recovery (straightening) of the strip and holds edging strip close to corners in walls, without bulging, avoiding penetration of the strip by the screed or inadequate levelling of the screed. Compared with known cross-slitting of the foam edging strip, which reduces the flex resistance of the strip so that it conforms to corners, the insert increases the flex resistance, to hold the strip in the bent position. The pref. plastics insert has the advantage over metal that it can be extruded simultaneously with the strip foaming process.

Heating mat for floors - uses flexible matrix carrying heating wires embedded within screed upon hard foam base with water barrier

Abstract: The heating mat consists of a porous flexible carrier (4) e.g. a glass fibre mat with a heating wire (5) mounted within it. The carrier is laid upon an insulating layer of hard foam (1) which is provided with a thin water barrier (1') on its upper side, and then covered on top with finishing material (3) like screed. This is allowed to penetrate the carrier to envelop the heating wire before it finally cures. Another form has the heating wire embedded in a glue layer upon which flagstones can be laid for direct floor heating. ADVANTAGE - Uniform heat dissipation; requires no separate mounting plate.

Apparatus for pre-finishing precast concrete plate

Abstract: PURPOSE:To improve workability and productivity by hanging a vibrator means and a screed means which are capable of moving up and down in parallel each other along a side of a fixed board and above a frame laid on the fixed board to make a smooth surface and form a surface layer comprising uniformized fine particles as the pre-finish. CONSTITUTION:Concrete C is cast into a frame W on a fixed board T, and the driving motors 10 and 27 of a vibrator means 3 and a screed means 4 are driven to cause a vibrator base 17 and a screed base 39 set on the lower part thereof to descend and respectively mount on concrete C along one side of the frame W. A vibrating motor 24 is driven to provide the fine vibration in an up-and-down direction to the vibrator base 17 which is hung by a rod 21 having a second bracket 15 equipped with a compressed spring 23. A driving motor 43 is driven, thereupon an eccentric disk 44 is rotated to cause a connecting rod 46 to shuttle, and the screed base 39 is shuttled horizontally in a longitudinal direction by the sliding guide of a guide shaft 34 and a second bracket 40.

Thermo-controller for the installation of a floor heating

Abstract: The "thermal controller" invention relates to a method and a device for implementing an automatic control system for drying out underfloor heating coatings so that no damage occurs to floor coverings or bulges in the screed surfaces. A control and measurement electronic device, which is protected and installed in an aluminium box to prevent manipulation, is in this case fitted to the heating system instead of the standard controller, an electronic controller (microprocessor) controlling the preliminary temperature actual value, by controlling the circulation pump and the mixer motor, via the difference between the desired value of the heating and cooling curve and the respective actual value of the preliminary temperature, in such a manner that the entire process of heating and cooling is carried out in accordance with the instructions and is documented with respect to time using a printer. To this extent, it is possible to limit the residual balancing moisture in the case of cement and anhydride coatings in accordance with the instructions by means of an automatic control system, optimum certainty being provided, in particular, by means of a record being produced over the entire sequence.

Screed initializing method for even-paving machine

Abstract: PURPOSE:To eliminate failure of pavement work by starting pavement with a program set according to various conditions on pavement in which a screed is automatically set to a pavement thickness and with a screed cylinder locked, sensing a lift, and raising it to a set value. CONSTITUTION:A hopper 2, a feeder 3 for feeding asphalt base material B rearward, a screw 4 for spreading it in both right and left directions, and a screed 5 for even-paving are provided. Also, the screed 5, which is suspended at the rear of a levelling arm 7 provided so that it can be swung up and down around a pivot shaft 6, is automatically set to a height of pavement thickness. Then the speed, thickness, and surface pressure value for the pavement, kinds of base material B, etc., are inputted into a control unit 30 to set a program, a lift of the screed 5 which is started to pave with a screed cylinder 9 locked is detected by its hydraulic pressure and, when it reaches a set value, the cylinder 9 is set free. Thus transfer to normal pavement can be speeded up.

Paving thickness controlling method for grader

Abstract: PURPOSE:To construct a continuous pavement as flat as practicable and without interruption by making paving work so that the thickness lies within a reference range as specified CONSTITUTION:A vehicle 1 is equipped with a pair of height sensors 13, 14, an inclination sensor 15, and a calculating device 30 A guide sensor 19 is mounted on a screed 5 supported by a leveling arm 6, which rotates up and down round a supporting shaft 7 as fulcrum This guide sensor 19 moves along the reference line 25 consisting of curb stones etc, and a pivot cylinder 8 moving the supporting shaft 7 up and down is controlled so that the asphalt mix material is laid and graded while the screed 5 is kept with a certain level difference to the reference line 25 The guide sensor 19 is moved up and down by a vertical motion device 10 relative to the screed 5 The calculating device 30 calculates the paving thickness on the basis of the results from measuring made by the height sensors 13, 14 and inclination sensor 15, also calculates the difference of the mean paved thickness from the target thickness, operates the vertical motion device 10 on the basis of the difference obtained, and moves the guide sensor 19 up and down

Method and apparatus for paving road

Abstract: PURPOSE:To pave road effectively and safely by preventing the increase in the whole length of construction as well as by avoiding damage to road by rutting by a method in which a paving machine is provided with a bitumen spreader and a leveler to supply paving material in flat form. CONSTITUTION:A paving material W is charged into a hopper 31 by damp truck 13 from the front of a paving machine 1, and the machine 1 is advanced with small speeds. During the advancing period, a panel 26 is operated, a variable valve 44 is opened, and a bitumen L is supplied through a pipe 42 to spreaders 43 and 43' through a tube 42 from a tank 41 to spread it over the front road G. The paving material W is sent to the road widthwise direction by a set of screw conveyers 33 and 33' to contribute it in an even thick form. The surface is leveled off flatly by a screed 34 set in a position variable way on the rear to form a paved layer (g) and compacted by the following load roller D. The construction section area can thus be shortened and the construction cost can be reduced.

Heating cable, intended for direct heating by radiation

Abstract: The cable is mounted on a thermally insulating layer and enclosed in a concrete slab or a mortar screed of a floor. It comprises only two cores (1 and 2) made of an electrically resistive material, enclosed in one and the same electrical insulator (3) consisting of a material which is a good conductor of heat. The two cores (1 and 2) are in a vertical plane when the cable is normally mounted on the insulating layer. It is enclosed in the slab or the screed which constitutes the floor. The two cores are twisted.

Leveling device for trench

Abstract: PURPOSE:To level off a trench having a smaller width than the lateral width of the screed of a finisher by a method in which a fixed screed and a movable screed are attached to a device detachably connected to the rear of a finisher. CONSTITUTION:A screw bar 30 is turned to vertically move a slide part 22, and a fixed screed 34 and a movable screed 36 are set at given levels to fix the bar 30. The positions of the screeds 34 and 36 are finely adjusted by position regulators 94 and 96. When the width of the trench is greater than the lateral width of the screed 34, the shaft 92 is turned to move the screed 36 sidewards to pull it out. Heated asphalt mixture is leveled off by the screeds 34 and 36, and after the operation, a cylinder device 120 is operated to move the screeds 34 and 36 from the road face. The trench of smaller width than the lateral width of the screed of the finisher can thus be leveled off.

Concrete floor leveler

Abstract: PURPOSE:To eliminate concentrated places of weight and to save man-power without requiring any rail by constituting a leveler of a horizontal multi- articulated wheel type link beam having one end connected to a truck and a leveling section connected to the other end thereof. CONSTITUTION:A truck 1 is fixed, the pressure-feed of concrete is started by a concrete pumping car P, the pulsation of concrete is reduced by an accumulator 4 through a concrete pressure-feed pipe 5, and it is discharged to a box-like screed plate 25 of a body 23 of a leveler 20 from the opening end 15a of a pressure-feed pipe 15. After that, the body 23 is kept in a specific constant level through a laser light receiving apparatus 27 and a level adjusting actuator 22, and concrete is consolidated with a bar-shaped vibrator 26 while turning moving it toward the truck 1 as indicated by arrow B. Aggregate is sunk by a concrete tamper 29, and the concrete is leveled with the screed plate 25 to form a horizontal concrete floor.

Automatic control condition setting method for even-paving machine

Abstract: PURPOSE:To increase the speed of condition setting by feeding asphalt base material in a hopper through a feeder, spreading it by a screw, setting the operating conditions for paving and evening it by a screed beforehand, and setting the conditions into a control unit by means of a recording medium such as IC card, etc. CONSTITUTION:A crawler type travelling vehicle 1 is provided with a hopper 2 and a feeder 3, and asphalt base material B supplied is spreaded evenly on both right and left sides of the vehicle by a screw 4. Also, the material B is paved evenly by a pair of screeds 5 which is moved up and down by the operation of a screed cylinder 9 around a pivot shaft 6. Then a machine for paving and evening asphalt base material B is used according to the operating conditions set in a control unit 30, and the operating conditions are set in the control unit 30 by means of a recording medium such as IC card, etc. Thus the operating conditions such as pavement thickness, etc., can be set rapidly and accurately into the control unit.

Under-floor duct system

Abstract: The floor shaft (12) has a shaft body (13) which consists of plastic and has lateral connections (15) to which duct elements (11) can be connected. Once the floor shaft (12) and the duct elements (11) have been laid, the duct structure is covered with screed, the floor shaft projecting out of the screed. The projecting region, which has a closed top wall (19), is subsequently cut off flush with the screed, using a tool.

Method of manufacturing a burial (funerary) vault made of concrete

Abstract: Method of manufacturing a burial vault made of concrete, consisting in spraying liquid concrete onto a framework (11) laid on a concrete screed (13) poured beforehand, the framework (11) resting in the concrete after it has set. The framework (11) may consist of a metal mesh (trellis) fixed temporarily to a demountable internal formwork (1), which is withdrawn after the setting of the concrete or of prefabricated concrete slabs (20) joined together by iron bars (3) associated with ties (31).

Pavement controlling method for paving machine

Abstract: PURPOSE:To quickly grasp the correct quantity of asphalt pavement mixture necessary for the remaining pavement by a method wherein the necessary quantity for the remaining work is obtained by computation, based on the width of the pavement already made, the quantity of the pavement mixture already used, and the width and the distance for the remaining pavement, and the result of the computation are displayed on a display unit. CONSTITUTION:As a vehicle 1 is made to travel, asphalt pavement mixture B in a hopper 2 is supplied rearward with a feeder 3, and is spread to the right and the left and after this, the mixture is laid and rolled with a screed 5. Then a computing unit obtains by computation the quantity of the pavement mixture necessary for the remaining pavement, based on the distance of the pavement inputted from an odometer, the width of the pavement already made, the quantity of the pavement mixture B already used that are inputted with an input device, and the width and the distance for the remaining pavement. Each of the above-mentioned inputted data and the quantity of the pavement mixture necessary for the remaining pavement are displayed on the screen of a display unit 36.