DK168830B1

DK168830B1 - Metal reinforcement for concrete

Info

Publication number: DK168830B1
Application number: DK565685A
Authority: DK
Inventors: Jean Albert Edouard Rene Corny
Original assignee: Montereau Acieries
Priority date: 1984-12-07
Filing date: 1985-12-06
Publication date: 1994-06-20
Also published as: EP0187075B1; PT81562B; PT81562A; AU5042285A; DK565685A; GR852916B; AU573927B2; JPS61191752A; DE3563864D1; HK77589A; ATE35836T1; BR8506091A; ES295972Y; ES295972U; ZA859048B; EP0187075A1; FR2574453B1; FR2574453A1; SG78688G; DK565685D0

Abstract

1. Metal reinforcement for reinforced concrete of the kind having a web with a convex polygonal section whose apices are slightly frustroconical with oblique ribs on its slightly convex faces and whose section is subtantially inscribed inside a circle, characterized in that the distance separating the most convex part of the ribs (4) and the centre of the web (1) is slightly less than that separating said center and said frustoconical apices (2).

Description

DK 168830 B1DK 168830 B1

Opfindelsen angår en metalarmering til armeret beton som angivet i krav 1's indledning.The invention relates to a metal reinforcement for reinforced concrete as set forth in the preamble of claim 1.

Man kender metalarmeringer til armeret beton, som er formgivet i varmen, og som har form som stænger med ovalt tværsnit med skrå ribber, som hver forløber over ca. 180e af stangens 5 periferi, idet hældningen af ribberne i forhold til aksen er ca. 60°.Metal reinforcements are known for reinforced concrete, which is shaped in the heat and has the shape of oval cross-sections with sloping ribs, each extending over approx. 180e of the periphery of the rod 5, the inclination of the ribs relative to the axis being approx. 60 °.

Som følge af fremstillingsmåden i varm tilstand leveres disse produkter til brugeren i form af spoler med deformerede viklingsomgange. Det er derfor nødvendigt at udrette disse viklingsomgange eller spiraler ved hjælp af specialmaskiner, så at man efter tilskæring i sektioner 10 opnår retlinede stænger, rektangler eller U-profiler.Due to the hot mode of manufacture, these products are supplied to the user in the form of coils with deformed winding turns. It is therefore necessary to align these winding turns or spirals with the aid of special machines, so that after cutting in sections 10 rectilinear bars, rectangles or U-profiles are obtained.

Man har konstateret, at de to ender af armeringeme efter bøjning ikke ligger i samme plan, men danner en betydelig vinkel indbyrdes, så at armeringeme ikke egner sig til udføring af den tilsigtede funktion.It has been found that the two ends of the reinforcements after bending do not lie in the same plane, but form a considerable angle to each other so that the reinforcements are not suitable for carrying out the intended function.

1515

Dette fænomen kan forklares ved, at omkredsen af et tværsnit i stangen på grund af ribberne forløber fra den ene ende til den anden uden nogen symmetriakse og ligger meget langt fra den ideelle kontur, nemlig den cirkulære.This phenomenon can be explained by the fact that the circumference of a cross section of the bar, due to the ribs, extends from one end to the other without any axis of symmetry and is very far from the ideal contour, namely the circular.

20 Ved passagen gennem maskinernes udretningsblokke underkaster valserne i disse maskiner derfor stangen vridningskræfter, som frembringer spændinger i stangen, og disse kræfter frigøres, når stangen senere underkastes en eller flere bukninger.Therefore, when passing through the straightening blocks of the machines, the rollers in these machines subject the rod to torsional forces which produce tension in the rod, and these forces are released when the rod is subsequently subjected to one or more bends.

Man har også konstateret, at ribbernes relief kun er meget svagt efter udretningen. Dette for-25 klares ved den omstændighed, at da hver række af ribber forløber over ca. 180°, sker kontakten med valserne praktisk taget i punkter, som befinder sig på toppen af ribberne. Til god medbringning af den stang, som skal rettes, er det derfor nødvendigt, at valserne udøver en meget stor kraft på ribberne.It has also been found that the relief of the ribs is only very weak after straightening. This is explained by the fact that as each row of ribs extends over approx. 180 °, the contact with the rollers is practically made at points which are at the top of the ribs. Therefore, in order to properly carry the rod to be straightened, it is necessary that the rollers exert a very large force on the ribs.

30 Fra FR-A-1 564 544 kendes et armeringsjem med en kærne med korsformet tværsnit, hvor fløjene er forbundet ved hjælp af skrå ribber, idet hele tværsnit kan indskrives i et kvadrat.30 FR-A-1 564 544 discloses a reinforcing knife having a cross-sectional core, the wings being joined by oblique ribs, the entire cross-section being inscribed in a square.

Et sådant armeringsjem har meget store variationer i tværsnittet, som frembringer torsionskræfter under udretningen.Such a reinforcing belt has very large cross-sectional variations which produce torsional forces during straightening.

3535

Fra FR-A-2 031 405 kendes ligeledes et armeringsjem med en kærne med konvekst polygonalt tværsnit og med skrå ribber, hvor tværsnittet kan indskrives i en cirkel, og hvor armeringsjemet er fremstillet ved koldbearbejdning af et rundt emne.From FR-A-2 031 405 there is also known a reinforcing yarn having a core with convex polygonal cross section and with sloping ribs, where the cross section can be inscribed in a circle and where the reinforcing yarn is made by cold working a circular workpiece.

2 DK 168830 Bl2 DK 168830 Bl

Under udretningen af dette armeringsjem vil valserne klemme ribberne flade.During the straightening of this reinforcing shaft, the rollers will squeeze the ribs flat.

Fra SE-A-414 065 kendes et armeringsjem med seglformede flanger, som ligeledes udsættes for deformation ved passage mellem udrettermaskinens valser.SE-A-414 065 discloses a reinforcing seal with seal-shaped flanges, which is also subjected to deformation when passing between the rollers of the straightening machine.

55

Armeringen ifølge opfindelsen, som afhjælper disse ulemper, er ejendommelig ved i krav 1's kendetegnende del anførte.The reinforcement according to the invention, which addresses these disadvantages, is characterized by the characterizing part of claim 1.

På denne måde foregår kontakten mellem armeringen og valserne med V-form eller lignende 10 indgrebsorganer på udretningsmaskinen ved vinkelspidseme, hvorved man undgår en deformation af ribberne.In this way, the contact between the reinforcement and the rollers has a V-shape or similar 10 engaging means on the straightening machine at the angular tips, thereby avoiding a deformation of the ribs.

Fordelagtige udførelsesformer er angivet i krav 1 og 2.Advantageous embodiments are set forth in claims 1 and 2.

15 Opfindelsen skal i det følgende forklares nærmere i forbindelse med tegningen, hvor fig. 1 viser et sidebillede af en armering ifølge opfindelsen, og fig. 2, 3 og 4 snit efter henholdsvis linierne Il-Il, lll-lll og IV-IV i fig. 1.The invention will now be explained in more detail in connection with the drawing, in which fig. 1 shows a side view of a reinforcement according to the invention, and FIG. 2, 3 and 4 are sectioned on the lines Il-II, III-III and IV-IV in FIG. First

20 Det fremgår af tegningen, at armeringen har en kæmedel 1, som i tværsnit har form som en firkant eller et kvadrat med afstumpede vinkelspidser 2, hvorved der dannes fire sideflader 3, som hver har ribber 4, som er skrå i forhold til armeringens akse X-X-j, og som strækker sig over lidt mindre end 90°. Vinklen mellem ribberne og aksen er af størrelsesordenen 25-45°.It can be seen from the drawing that the reinforcement has a chain means 1, which in cross section has the shape of a square or square with blunt angular tips 2, thereby forming four side faces 3, each having ribs 4, which are inclined with respect to the axis of the reinforcement. XXj, and extending over slightly less than 90 °. The angle between the ribs and the axis is of the order of 25-45 °.

25 Som det fremgår af fig. 2, kan midterdelen praktisk taget indskrives i en cirkel, hvor vinkelspidseme 2 har afstumpet eller afrundet form.25 As can be seen from FIG. 2, the center portion can be practically inscribed in a circle where the angular tips 2 have blunt or rounded shape.

Ifølge opfindelsen er afstanden D1 mellem armeringens centrum C og toppunktet af ribben lidt mindre end afstanden D2 mellem centrum C og kæmedelens vinkelspids 2. På denne måde 30 foregår kontakten mellem armeringen og valserne med V-form eller lignende indgrebsorganer på udretningsmaskinen ved vinkelspidserne 2, hvorved man undgår en deformation af ribberne.According to the invention, the distance D1 between the center C of the reinforcement and the apex of the rib is slightly less than the distance D2 between the center C and the angular tip of the chewing agent 2. In this way, the contact between the reinforcement and the rollers with V-shape or similar engagement means takes place on the straightening machine at the angular tips 2, a deformation of the ribs is avoided.

Ifølge en udførelsesform er ribberne i to naboflader forbundet parvis, så at toppunktet i hver 35 ribbe på en flade ligger i en skrå plan, som passerer toppunktet i ribben på den anden flade. Projektionssporet for en af disse planer er vist som Y-Y-j i fig. 1.According to one embodiment, the ribs in two adjacent surfaces are connected in pairs so that the apex of each 35 ribs on one surface lies in an oblique plane passing the vertex of the ribs on the other surface. The projection trace for one of these planes is shown as Y-Y-j in FIG. First

Ribberne i de to andre flader (vist punkteret i fig. 1) runder i modsat retning.The ribs in the other two surfaces (shown punctured in Fig. 1) round in the opposite direction.

DK 168830 B1 3 Kærnedelens flader er svagt udadhvælvet.DK 168830 B1 3 The core of the core part is slightly outwards.

Som det fremgår af fig. 2-4, er armeringens tværsnit praktisk taget ens og indskrivelige i en cirkel.As shown in FIG. 2-4, the cross sections of the reinforcement are practically similar and inscrutable in a circle.

55

Det har ved forsøg vist sig, at armeringen ifølge opfindelsen passerer udretningsmaskinen uden at foretage nogen rotation omkring sin akse. Man har også konstateret, at ved en senere bukning forbliver de to ender af armeringen i den plan, hvori bukningen udføres.It has been found by experiment that the reinforcement according to the invention passes the straightening machine without making any rotation about its axis. It has also been found that at a later bending, the two ends of the reinforcement remain in the plane in which the bending is performed.

10 Det vil forstås, at armeringsstangen kan have polygontværsnit med n sider, som bestemmer n flader, som alle eller for en dels vedkommende har ribber i lighed med ribberne 4.It will be appreciated that the reinforcing bar may have polygon cross sections with n sides defining n surfaces all or partly having ribs similar to the ribs 4.

Claims

1. Reinforcement for reinforced concrete of the kind in which there is a chewing agent (1) of polygonal cross-section, the angular tips of which are slightly blunted and where on the slightly curved surfaces 5 of the reinforcement there are inclined ribs, the cross-section of the core part (1) being practically capable of is inscribed in a circle, characterized in that the distance (D1) between the most vaulted part of a rib (4) and the center (C) of the core part (1) is slightly less than the distance (D2) between the center (C) and the core. the blunted angular tips (2) of the part (1).

Reinforced concrete metal reinforcement according to claim 1, characterized in that the cross-section of the core part (1) is square or square.

Metal reinforcement for reinforced concrete according to claims 1-2, characterized in that the blunt angle tips (2) are rounded. 15