Showing papers on "Screed published in 1970"

Expansible reveal with frontal tear strip for plaster walls

Abstract: An extruded generally T-shaped separator or screed is tacked along the wall base with the center leg projecting outwardly. Plaster is applied to the wall base to interlock opposite sides of the screed leg. The screed leg is itself hollow, the frontal exposed side being a tear strip finally removed to form a reveal, and the rearward side being bowed or sinuous to form an expansion mechanism. As the plaster expands and contracts transversely to the screed leg, the reveal opens and closes correspondingly without any separation of the leg sides from the respective sections of the cast wall.

Modular building construction and method

Abstract: An improved building construction and method of assembly from modular components, each modular component including (as erected) a pair of parallel horizontal Tee channels with the legs of the Tees facing each other, two or more vertical steel pipes suitably slotted and connected at their ends to the legs of the Tee channels, panels of lightweight plastic insulation filling the rectangular spaces formed by the foregoing members and suitably slotted to be received over the legs of the Tee channels, reinforcing wire screen surrounding the pipe sections and both surfaces of the insulation panels and a layer of concrete gunned onto both sides of the insulation material against the wire screens and level with the screed line formed by the outer edges of the Tee channels.

Proportional screed control for a finisher

Abstract: A finishing machine, or paver, employs a proportional control system for controlling the disposition of a floating screed with respect to both grade and slope of the supporting surface. The apparatus for controlling grade includes a device for sensing grade with respect to a reference and an amplifier and switch unit for operating a grade control actuator in response to the sensed changes in grade. The slope control apparatus is generally the same as the grade control apparatus and further includes a variable remote set point unit for establishing a reference indicative of the desired slope.

An improved roof vent

Abstract: 1,204,571. Roof vent. PERMANITE Ltd. 28 March,. 1969 [11 April, 1968], No. 17678/ 68. Heading E1W. A roof vent for removing moisture from roof structures comprises a body 28 of porous material (e.g. block, rod or tube of porous clay) extending with clearance into a tubular member which is closed at its top end 23 and which has at least one air outlet adjacent the top and at least one air inlet between the ends of the tubular member. The tubular member may be in three parts:-a base 12 with a fixing flange 14; a middle part 13 fixed to base 12 by lugs 18 and screws 20 and defining inlet 22 with base 12; a top 23 fitting on the middle 13 and defining outlet 26 with middle 13. The body 28 may be placed in screed 10, the tubular member is placed with flange 14 on the screed and mastic asphalt or felt 11 may be layed thereon. The inlet and outlet may be downwardly directed to avoid ingress of water &c.

Improvements in Road Carpeting Machines

Abstract: 1,196,432. Road making machines. HUDSWELL CLARKE & CO. Ltd. 21 March, 1968 [5 April, 1967], No.15608/67. Heading E1G. In a road-paving machine material (asphalt, concrete, &c) from a front hopper 4 on a wheeled chassis 31 is fed rearwardly by two parallel scraper conveyers 17, 18 and deposited on the ground in front of a trailing screed and spreader plate assembly 7 carried by a sulb-chassis 6 extending rearwardly from a horizontal pivot 5. The two conveyers are independently driven through infinitely variable speed drives controlled from an operators station 32. The assembly 7 rests on the deposited material and is suspended by adjustable hangers 46 and rods 47 from the subchassis 6. When not in use, the sub-chassis 6 may be raised by a ram and lost motion link (not shown). The machine also includes independent variable-speed hydraulic drives for two reversible distributing augers 35, 36 and for a tamper plate 52. The screed plate 51 and spreader plate 51 a form part of a centrally-split box 45 provided with chain-coupled adjusting screws 67 whereby the plate 51 may be shaped to form a central crown. Lateral extension boxes 60 may be swung into line with the box 45, and extension augers may be coupled to the hollow shafts of augers 35, 36-Fig. 6 (not shown). In the inoperative position shown the boxes 60 may be held raised by cam tracks 62 or by jack bolts. The screed heater 59 may be provided. The front wheels 2 are steerable. The wheels 3 are chain driven from half shafts connected through a lockable differential gear and hydrostatic transmission 10 to an engine 8. Each conveyer, Fig. 4 (not shown), comprises a fixed horizontal plate (19) over which material is swept by transverse slats (26) carried by underlying endless chains (21). Rollers 85 adjacent the front hopper 4 can bear against the wheels of a loading truck to allow loading during advance. In a modified machine, for confined conditions, the hopper 4 is replaced by a long narrow hopper which can be swung about a vertical axis for side loading.

Construction control of rigid pavement roughness

Abstract: PAVING PROCEDURES WERE MONITORED AND PERFORMANCE SURVEYED FOR 5 YEARS ON 108 PORTLAND CEMENT CONCRETE PAVEMENT PROJECTS TO DETERMINE THE FACTORS AFFECTING AS-BUILT SURFACE ROUGHNESS. THE CALIFORNIA PROFILOGRAPH WAS REPORTED EARLIER IN THIS INVESTIGATION TO BE A FAST, ACCURATE, AND REPRODUCIBLE METHOD OF MEASURING ROUGHNESS WITHIN A FEW HOURS AFTER PAVING. BY CONTRAST, CONSCIENTIOUS INSPECTION WITH A 10-FT STRAIGHT EDGE AND CORRECTION OF OUT-OF-TOLERANCE BUMPS DURING CONSTRUCTION DO NOT ASSURE SMOOTH-RIDING PAVEMENT. SLIP-FORM PAVING GENERALLY PRODUCES A MUCH SMOOTHER SURFACE THAN PAVING WITH CONVENTIONAL FIXED SIDE-FORMS. ALTHOUGH GOOD RESULTS CAN BE ACHIEVED BY EITHER METHOD, NEITHER ASSURES SMOOTHNESS. AMONG THE FACTORS FOUND TO AFFECT THE RESULTS FOR SIDE-FORM PAVEMENT ARE PAVING MACHINE BACKUP, PAN FLOATS, NUMBER OF SCREEDS, NIGHT JOINTS, PAVING EQUIPMENT CONDITION, AND PAVEMENT ALIGNMENT AND CROSS-SLOPE. FOR SLIP-FORM PAVING, THE MOST IMPORTANT ARE CONDITION OF THE FINE GRADE AND SUBGRADE, MESH PLACEMENT, NIGHT JOINTS, AND CHANGES IN CONCRETE SLUP. THE CLARY SCREED ALSO SHOWS PROMISE AS A MEANS OF REDUCING PAVEMENT ROUGHNESS WITH SLIP-FORM PAVING. GENERAL REQUIREMENTS FOR A SPECIFICATION TO ASSURE CONSTRUCTION OF SMOOTH PAVEMENT ARE ALSO DISCUSSED.

Improvements in or relating to Prestressed Concrete Structures

Abstract: 1,181,804. Roof or floor structure. GILBERT-ASH Ltd. 12 Sept., 1967 [12 Sept., 1966], No. 40692/66. Heading E1W. A floor or roof structure comprises downwardly flanged concrete slabs 6, Fig. 7 each having reinforcement wholly contained therein, spanning between reinforced or prestressed concrete primary beams 4 and resting on seatings 5 on the beams, steel connecting bars 10, Fig. 2 embedded in concrete cast between the flanges 7 of the slabs and spanning across the primary beams, steel lacer bars 20, extending longitudinally above the primary beams 4 and embedded in concrete cast above the beams and further steel lacer bars 19 extending continuously at right angles to the bars 20 and also embedded in the concrete between the flanges 7 of the slabs. A screed may be laid over the slabs and joints therebetween. The beams 4 may be apertured to receive some of the bars 10. The flanges of the slabs may be recessed at 7a to key with the cast concrete