Topic
Screed
About: Screed is a research topic. Over the lifetime, 1899 publications have been published within this topic receiving 11118 citations.
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Patent•
22 Jun 2006
TL;DR: In this paper, a back pressure changing mechanism of screed lift cylinders for a road paving machine, which ensures the flatness of a pavement surface and the uniformity of pavement density even if a paving width of a screed is changed during execution of paving work, is presented.
Abstract: PROBLEM TO BE SOLVED: To provide a back pressure changing mechanism of screed lift cylinders for a road paving machine, which ensures the flatness of a pavement surface and the uniformity of pavement density even if a paving width of a screed is changed during execution of paving work. SOLUTION: The back pressure changing mechanism is formed of a paving width detecting means 17 for detecting the paving width of the expandable screed 6, and a back pressure adjusting means for adjusting the back pressure of the lift cylinders 7, 8 so as to be increased/decreased depending on increase/decrease of the paving width detected by the paving width detecting means 17. COPYRIGHT: (C)2006,JPO&NCIPI
7 citations
7 citations
Patent•
24 Feb 1981
TL;DR: An arrangement and method for laying concrete floors includes precast concrete, combination concrete-forming and screed-guiding beams as discussed by the authors, where the beams are shaped to provide screed slide faces, anchorage flanges, and as desired, reinforcement bracket projections and dowel opening.
Abstract: An arrangement and method for laying concrete floors includes precast concrete, combination concrete-forming and screed-guiding beams. The beams are shaped to provide screed slide faces, anchorage flanges, and as desired, reinforcement bracket projections and dowel opening. The beams are located, leveled and anchored, in a spaced pattern of sections. Concrete reinforcements and dowels are used in the floor area to be laid, as desired. Concrete may be poured in all the sections defined by the beam pattern, and screeded, with the screeds being supported on the beams. The beams are not removed, but hardened into the floor with the poured concrete, eliminating such past, costly practices as temporary screed guide placement and removal, and the required work stoppage and overnight wait for some sections to harden, until adjacent sections can be poured.
7 citations
Patent•
27 Apr 1995
TL;DR: In this paper, a new holding rail is designed in such a way that there is no risk whatsoever of damage to the abutment when the openings are punched out, and the openings reach as far as the web (11) of the holding rail (10).
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.
7 citations
Patent•
27 Jun 2017
TL;DR: In this paper, a construction method of a crack-resisting concrete-stabilized base course is presented, which consists of three-to-five percent of water and 3-5% of cement.
Abstract: The invention discloses a construction method of a crack-resisting cement stabilized crushed stone base course. The problems that at present, contraction fissures of a traditional cement stabilized crushed stone are many, the surface is prone to loosening after freeze-thaw, the defects of the construction mode exist in the construction side, and therefore large-area cracks and freeze-thaw are generated in the subsequent process of the road surface are solved. According to the key points of the technical scheme, the construction method comprises the following steps that (a), the crack-resisting cement stabilized crushed stone base course comprises a collected material, 3%-5% of cement and water, the curve of the screen hole size of the collected material and the passing percentage is in an S shape; (b), a mixture is mixed; (c), the mixture is conveyed; (d), the mixture is paved, specifically, square timber cushion blocks are put under a paver screed plate in advance, and mixture paving adopts two pavers to synchronously operate in an echelon formation mode; (e), the mixture is grinded; and (f), curing is conducted, specifically, a curing film or geotechnical cloth is covered to conduct hydrating curing, so that the surface of the cement stabilized course keeps a moist state all the time, and the cement stabilized crushed stone base course with the crack-resisting property being obviously improved is obtained.
7 citations