EP1398431B1 - Process for manufacturing a vertical scaffold element, and element obtained by using said process - Google Patents
Process for manufacturing a vertical scaffold element, and element obtained by using said process Download PDFInfo
- Publication number
- EP1398431B1 EP1398431B1 EP02292249A EP02292249A EP1398431B1 EP 1398431 B1 EP1398431 B1 EP 1398431B1 EP 02292249 A EP02292249 A EP 02292249A EP 02292249 A EP02292249 A EP 02292249A EP 1398431 B1 EP1398431 B1 EP 1398431B1
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- European Patent Office
- Prior art keywords
- star
- strip
- tubular portion
- recesses
- welded
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G7/00—Connections between parts of the scaffold
- E04G7/30—Scaffolding bars or members with non-detachably fixed coupling elements
- E04G7/302—Scaffolding bars or members with non-detachably fixed coupling elements for connecting crossing or intersecting bars or members
- E04G7/306—Scaffolding bars or members with non-detachably fixed coupling elements for connecting crossing or intersecting bars or members the added coupling elements are fixed at several bars or members to connect
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/30—Laterally related members connected by latch means, e.g., scaffold connectors
Definitions
- the present invention relates to the field of scaffolding, and more specifically it relates to improvements made to the vertical scaffolding elements consisting of a tubular section provided with a number of radially projecting bushings distributed peripherally in a star, intended for the attachment of a horizontal transom end of the scaffolding.
- the bushings are manufactured individually, from a metal plate bent in the form of a U-shaped stirrup, and then individually welded to the tubular section. Each edge of the U-shaped stirrup is welded to the tubular section both externally and possibly internally.
- the documents GB-A-2 207875 and FR-A-1,553,487 certainly show arrangements of scaffolding elements comprising a star-shaped part, defining radial sleeves for fastening sleepers.
- the document GB-A-2,207,875 discloses a device that can be manufactured by carrying out the method set forth in the preamble of claim 1.
- star parts disclosed in these documents have a geometric conformation that does not allow easy manufacture with simple equipment by a low-skilled workforce.
- the object of the invention is to remedy these drawbacks and to propose an improved solution that can simplify the manufacturing process, and make it shorter, simpler and therefore less expensive.
- the invention provides a method of manufacturing a vertical scaffolding element according to the preamble of claim 1, which method is characterized according to the invention by the steps set out in the part characterized in claim 1.
- the sleeves are no longer manufactured and individually secured to the tubular section by a large number of longitudinal welds; but they result from the realization of a star-shaped part; and moreover, this star piece is obtained by simple stamping and folding operations on an initially flat metal strip, which piece is then welded to the tubular section by a small number of arc welds that can be achieved quickly. with simple equipment, not requiring qualified personnel.
- the fingerprints are formed as open dihedral at an angle of 2 ⁇ / n .
- the stamped strip is folded so as to bring the lateral faces of two adjacent impressions in a substantially parallel mutual position.
- the number of fingerprints is four and for the angle ⁇ of opening of the dihedrons formed by the fingerprints to be approximately 90 °, thanks to which one obtains a vertical scaffolding element consisting of a tubular section equipped with four sockets arranged substantially in a cross.
- the metal strip is treated in such a way that said abutting ends of the strip which are welded are located outside the end of a socket, so that the weld seam does not interfere with the fastening of the members. complementary scaffolding on the socket.
- the welded abutting ends of the strip it will be advantageous for the welded abutting ends of the strip to be located in an area of the star-shaped part that bears against the tubular section, so that the upper and lower ends of the weld bead are remelted during the subsequent welding of the star piece on the tubular section.
- the invention proposes a vertical scaffolding element as defined in claim 9.
- FIGS. 1A to 1G taking more particularly into consideration a preferred embodiment with four bushings arranged substantially in cross, that is to say diametrically opposite two by two according to two perpendicular branches, because this is the configuration which, in practice, seems to have to find the most extensive application.
- n impressions 2 approximately dihedron with rounded edge 3 extending transversely to the extent of the strip 1.
- Two successive two fingerprints are separated by a flat zone 5, undeformed, of the strip 1.
- a short section 6 is pressed substantially perpendicularly to the wall 4a, 4b respectively, of the adjacent footprint 2.
- the bending or folding operation is performed in two steps.
- the star part 11 is in the form of a cross with opposite arms, offset by 90 °, as illustrated in FIG. 1D.
- the short sections 6 of the ends of the strip 1 are butted to form an end of one of the branches.
- the star piece 11 is terminated by welding the abovementioned ends 6 at 13, so that a monobloc star piece 11 consisting of a metal strip conforming to a closed contour of complex shape is obtained, as illustrated in FIG. 1E (here piece 11 has a cross section with four branches).
- the rounded edges 3 of the dihedral impressions 2 are all positioned on a cylindrical contour of revolution, the dimensions of the various deformed / folded parts of the strip 1 being chosen so that this cylindrical contour 12 (drawn in dashes in Figure 1D) possesses substantially the same diameter as the outside diameter of a tubular mounting section.
- the star piece 11 is put on and positioned on a metal tubular section 14 (FIG. 1F), the rounded edges 3 of the dihedrons formed by the initial impressions 2 bearing against the external face of the tubular section 14.
- the revolution cylinder 12 for positioning the rounded edges 3 is of a diameter slightly smaller than that of the outer face of the tubular section 14 so that the star piece 11 elastically clamps the tubular section 14 on which it is inserted: the star part 11 thus remains in place without other retaining means for the next operation.
- weld beads 15 are deposited, in two circular passes, on the upper and lower edges of the rounded edges 3, or in eight locations. in the example illustrated in Figure 1G.
- a vertical scaffolding element generally designated by the reference 16, which consists of a tubular section 14 provided with a number n (here four) of sockets 17 radially projecting distributed peripherally star, intended for attachment of a horizontal end of the scaffolding horizontal cross.
- n here four
- the configuration of the star part 11 and its welding on the tubular section 14 by welding seams 15 in upper and lower arcs are clearly visible in Figure 2.
- the method of the invention eliminates the disadvantages associated with the manufacture and joining of the individual sockets. It allows the manufacture of all sleeves 17 in integral form, the star part 11 can be obtained by implementing simple mechanical processes. In addition, its attachment to the tubular section requires two welding operations performed circularly, discontinuously, around the perimeter of the tubular section, and therefore under very simple conditions. These two welding operations can be performed in one pass by using two welding equipment, or in two successive passes.
- the invention is not limited to this single configuration and it is possible to envisage an implementation of the method of the invention to lead to a star part 11 'whose branches 17' have a different conformation , for example a tapered conformation as schematically illustrated in FIG. 3.
- the branches 17 ' may have convergent walls joined at their end by a flattened transverse portion 5' having a width less than the portion 5 provided for in FIGS. 1A to 1G and 2 Even the transverse portion 5 'can be reduced to nothing and the walls converge in a point-like manner. It suffices for this to adapt accordingly the stamping operation of Figure 1B (imprints 2 more or less close or even contiguous), and the folding operations of Figures 1C and 1D (approximation of the walls 4, 4b so that they converge without becoming parallel).
- FIG. 4 schematically illustrates the conformation of a vertical element 16 'incorporating a star-shaped part 11' defining three sockets 17 '' spaced apart by 120 °, with convergent side walls according to the arrangements of FIG.
- the abutting ends of the folded metal strip according to the method of the invention are located approximately on the end of a socket.
- the weld bead 13 solidarisant these ends may constitute an inconvenience for hanging on the bushing of scaffolding members. It may therefore be desirable to ensure that said butted ends are outside the end of the sleeve, for example laterally or even preferably in an area of the star part 11 which bears against the tubular section. (That is to say in the re-entrant angle separating two consecutive sockets) as is clearly illustrated in FIG. 5.
- the high and low ends of the weld 13 are re-melted during the welding of the part. in star 11 on the tubular section, which has a favorable influence on the quality of these welds.
- the rounded edges 3 may be shaped with their concavity facing outwards, so that these concave-shaped edges 18 better fit the cylindrical outline of the tubular section 14. on which they are applied and soldered.
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Abstract
Description
La présente invention concerne le domaine des échafaudages, et plus spécifiquement elle concerne des perfectionnements apportés aux éléments verticaux d'échafaudage constitués d'un tronçon tubulaire pourvu d'un certain nombre de douilles en saillie radiale, réparties périphériquement en étoile, destinées à l'accrochage d'une extrémité de traverse horizontale de l'échafaudage.The present invention relates to the field of scaffolding, and more specifically it relates to improvements made to the vertical scaffolding elements consisting of a tubular section provided with a number of radially projecting bushings distributed peripherally in a star, intended for the attachment of a horizontal transom end of the scaffolding.
Des éléments d'échafaudage du type considéré sont décrits et représentés par exemple dans le document
Dans les éléments d'échafaudage du type considéré utilisés actuellement, les douilles sont fabriquées individuellement, à partir d'une plaque métallique pliée sous forme d'un étrier en U, puis soudées individuellement sur le tronçon tubulaire. Chaque bord de l'étrier en U est soudé au tronçon tubulaire à la fois extérieurement et éventuellement intérieurement.In the scaffolding elements of the type considered currently used, the bushings are manufactured individually, from a metal plate bent in the form of a U-shaped stirrup, and then individually welded to the tubular section. Each edge of the U-shaped stirrup is welded to the tubular section both externally and possibly internally.
Il en résulte, pour un élément d'échafaudage équipé de quatre douilles disposées en croix, la nécessité de réaliser huit lignes de soudure linéaires d'étendue longitudinale. De plus, la réalisation des soudures intérieures est complexe et nécessite un matériel spécifique apte à être engagé à l'intérieur des douilles.As a result, for a scaffolding element equipped with four sockets arranged in a cross, the need to produce eight linear weld lines of longitudinal extent. In addition, the realization of the inner welds is complex and requires specific equipment capable of being engaged inside the sockets.
La fabrication de ce type de matériel se révèle difficile, longue et coûteuse.The manufacture of this type of material is difficult, long and expensive.
Les documents
En particulier, le document
Toutefois, les pièces en étoile divulguées dans ces documents présentent une conformation géométrique qui ne permet pas une fabrication aisée avec un matériel simple par une main d'oeuvre peu qualifiée.However, the star parts disclosed in these documents have a geometric conformation that does not allow easy manufacture with simple equipment by a low-skilled workforce.
L'invention a pour but de remédier à ces inconvénients et de proposer une solution perfectionnée propre à simplifier le processus de fabrication, et à le rendre moins long, plus simple, et donc moins coûteux.The object of the invention is to remedy these drawbacks and to propose an improved solution that can simplify the manufacturing process, and make it shorter, simpler and therefore less expensive.
A ces fins, selon un premier de ses aspects, l'invention propose un procédé de fabrication d'un élément vertical d'échafaudage selon le préambule de la revendication 1, lequel procédé se caractérise selon l'invention par les étapes énoncées dans la partie caractérisante de la revendication 1.For these purposes, according to a first of its aspects, the invention provides a method of manufacturing a vertical scaffolding element according to the preamble of
Grâce à l'invention, les douilles ne sont plus fabriquées et solidarisées individuellement au tronçon tubulaire par un nombre élevé de soudures longitudinales ; mais elles résultent de la réalisation d'une pièce en étoile ; et de plus, cette pièce en étoile est obtenue par des opérations simples d'emboutissage et de pliage sur une bande métallique initialement plane, laquelle pièce est ensuite soudée au tronçon tubulaire par un nombre peu élevé de soudures en arc de cercle réalisables de façon rapide avec un matériel simple, ne nécessitant pas un personnel qualifié.Thanks to the invention, the sleeves are no longer manufactured and individually secured to the tubular section by a large number of longitudinal welds; but they result from the realization of a star-shaped part; and moreover, this star piece is obtained by simple stamping and folding operations on an initially flat metal strip, which piece is then welded to the tubular section by a small number of arc welds that can be achieved quickly. with simple equipment, not requiring qualified personnel.
Le coût de fabrication d'un élément d'échafaudage par mise en oeuvre du procédé de l'invention est considérablement abaissé, en même temps que l'élément est fabriqué en un laps de temps beaucoup plus court.The cost of manufacturing a scaffolding element by carrying out the process of the invention is considerably reduced, at the same time as the element is manufactured in a much shorter period of time.
On notera également un avantage considérable touchant à la sécurité. Si une douille vient à être arrachée - c'est-à-dire que ses soudures au tronçon tubulaire sont brisées - par exemple sous l'effet d'un effort trop élevé, la douille arrachée continue à faire corps avec le reste de la pièce qui, elle, reste solidarisée au tronçon tubulaire par ses autres soudures. On évite ainsi la chute d'une traverse s'appuyant sur la douille arrachée, comme ce serait le cas avec des douilles individuelles.There will also be a significant safety benefit. If a socket is torn off - that is to say, its welds to the tubular section are broken - for example under the effect of a force too high, the torn sleeve continues to be one with the rest of the piece which, it remains secured to the tubular section by its other welds. This avoids the fall of a cross member resting on the torn sleeve, as it would be the case with individual sockets.
De façon simple, on prévoit que les empreintes sont formées sous forme de dièdres ouverts sous un angle de 2π/n.In a simple way, it is expected that the fingerprints are formed as open dihedral at an angle of 2π / n .
Egalement, de façon avantageuse, la bande emboutie est pliée de manière à amener les faces latérales de deux empreintes adjacentes dans une position mutuelle sensiblement parallèle.Also, advantageously, the stamped strip is folded so as to bring the lateral faces of two adjacent impressions in a substantially parallel mutual position.
Dans un mode de réalisation préféré qui semble devoir constituer l'application pratique la plus courante de l'invention, on peut prévoir que le nombre des empreintes soit de quatre et que l'angle α d'ouverture des dièdres formés par les empreintes soit d'environ 90°, ce grâce à quoi on obtient un élément vertical d'échafaudage constitué d'un tronçon tubulaire équipé de quatre douilles disposées sensiblement en croix.In a preferred embodiment which seems to be the most common practical application of the invention, it is possible to provide for the number of fingerprints to be four and for the angle α of opening of the dihedrons formed by the fingerprints to be approximately 90 °, thanks to which one obtains a vertical scaffolding element consisting of a tubular section equipped with four sockets arranged substantially in a cross.
De préférence, la bande métallique est traitée de telle manière que les susdites extrémités aboutées de la bande qui sont soudées se situent en dehors de l'extrémité d'une douille, de manière que le cordon de soudure ne gêne pas l'accrochage des organes complémentaires de l'échafaudage sur la douille. Avantageusement, on aura intérêt à ce que les extrémités aboutées soudées de la bande se situent dans une zone de la pièce en étoile qui est en appui contre le tronçon tubulaire, de telle manière que les extrémités haute et basse du cordon de soudure soient refondues lors de la soudure subséquente de la pièce en étoile sur le tronçon tubulaire.Preferably, the metal strip is treated in such a way that said abutting ends of the strip which are welded are located outside the end of a socket, so that the weld seam does not interfere with the fastening of the members. complementary scaffolding on the socket. Advantageously, it will be advantageous for the welded abutting ends of the strip to be located in an area of the star-shaped part that bears against the tubular section, so that the upper and lower ends of the weld bead are remelted during the subsequent welding of the star piece on the tubular section.
Selon un second de ses aspects, l'invention propose un élément vertical d'échafaudage tel que défini dans la revendication 9.According to a second of its aspects, the invention proposes a vertical scaffolding element as defined in
L'invention sera mieux comprise à la lecture de la description détaillée qui suit de certains modes de réalisation donnés à titre purement illustratif. Dans cette description, on se réfère aux dessins annexés sur lesquels :
- les figures 1A à 1G illustrent des étapes successives de fabrication d'un mode de réalisation préféré d'un élément vertical d'échafaudage conformément à l'invention ;
- la figure 2 est une vue en perspective d'un élément vertical d'échafaudage constitué conformément à l'invention ;
- les figures 3 et 4 sont, respectivement, deux vues schématiques de variantes de réalisation de la pièce en étoile de la figure 1E ; et
- la figure 5 est une vue en perspective analogue à celle de la figure 2, montrant une variante préférée de réalisation.
- FIGS. 1A to 1G illustrate successive steps of manufacturing a preferred embodiment of a vertical scaffolding element in accordance with the invention;
- Figure 2 is a perspective view of a vertical scaffolding element formed in accordance with the invention;
- Figures 3 and 4 are respectively two schematic views of alternative embodiments of the star part of Figure 1E; and
- Figure 5 is a perspective view similar to that of Figure 2, showing a preferred embodiment.
Le procédé de l'invention va maintenant être expliqué en référence aux figures 1A à 1G, en prenant plus particulièrement en considération un mode de réalisation préféré à quatre douilles disposées sensiblement en croix, c'est-à-dire diamétralement opposées deux à deux selon deux branches perpendiculaires, car il s'agit là de la configuration qui, en pratique, semble devoir trouver l'application la plus étendue.The method of the invention will now be explained with reference to FIGS. 1A to 1G, taking more particularly into consideration a preferred embodiment with four bushings arranged substantially in cross, that is to say diametrically opposite two by two according to two perpendicular branches, because this is the configuration which, in practice, seems to have to find the most extensive application.
On commence par former une bande métallique plane 1 de longueur prédéterminée (figure 1A, sur laquelle, ainsi que sur les figures suivantes, la bande métallique 1 est représentée sans épaisseur, par un trait simple, par souci de clarté).We begin by forming a
On procède ensuite au poinçonnage des logements de verrous de diagonale, ce poinçonnage s'effectuant ainsi à plat, dans de bonnes conditions.Punching of the diagonal locks is then done, this punching thus being carried out flat, under good conditions.
Puis, on emboutit ladite bande 1 à plat en n (ici quatre) emplacements régulièrement espacés de manière à former n empreintes 2 approximativement en dièdre à arête 3 arrondie s'étendant transversalement à l'étendue de la bande 1.Then, said
De préférence, les empreintes 2 en forme de dièdre sont ouvertes selon un angle α=2π/n, soit dans le cas illustré sous un angle d'environ 90°.Preferably, the
Comme on le voit à la figure 1B, chaque empreinte 2 en forme de dièdre est donc délimitée par deux parois 4a, 4b sensiblement planes qui sont mutuellement inclinées sous le susdit angle α=2π/n et qui sont raccordées par l'arête arrondie 3. Deux empreintes 2 successives sont séparées par une zone plate 5, non déformée, de la bande 1. Aux extrémités de la bande 1, un court tronçon 6 est embouti sensiblement perpendiculairement à la paroi 4a, respectivement 4b, de l'empreinte 2 adjacente.As seen in Figure 1B, each
On effectue ensuite , sur la bande ainsi emboutie avec ses empreintes 2, une opération de cambrage ou pliage de la bande en pliant la bande métallique aux raccordements des extrémités des faces 4a, 4b des empreintes avec les zones plates intermédiaires 5 de manière à rapprocher l'une de l'autre les faces latérales successives 4a, 4b appartenant respectivement à deux empreintes adjacentes qui sont situées de part et d'autre d'une zone plate 5.Then carried out on the tape and pressed with its
Dans l'exemple à quatre empreintes pris en considération ici, on effectue l'opération de cambrage ou pliage en deux étapes.In the four-cavity example considered here, the bending or folding operation is performed in two steps.
A la figure 1C, on commence par plier les deux extrémités de la bande en faisant pivoter (flèche 8) l'empreinte extrême respective 2 et la zone plate 5 adjacente autour du raccordement 7 de ladite zone plate 5 avec l'empreinte 2 adjacente.In Figure 1C, it begins by folding the two ends of the strip by pivoting (arrow 8) the
Puis, sur la pièce intermédiaire ainsi obtenue (figure 1C), on procède à un pliage des deux parties entourant la zone plate 5 centrale par pivotement (flèche 9) autour des raccordements 10 desdites parties avec ladite zone plate 5 centrale.Then, on the intermediate piece thus obtained (FIG. 1C), the two parts surrounding the central
Ensuite de quoi, on obtient une pièce en étoile 11 pourvue de n branches mutuellement écartées angulairement de 2π/n. Dans l'exemple considéré ici, la pièce en étoile 11 est en forme de croix à bras opposés, décalés de 90°, comme illustré à la figure 1D. Les courts tronçons 6 des extrémités de la bande 1 sont aboutés pour former une extrémité d'une des branches.Then, we obtain a
On termine la pièce en étoile 11 en soudant en 13 les extrémités 6 précitées bord à bord, de sorte qu'on obtient une pièce en étoile 11 monobloc, constituée d'une bande métallique épousant un contour fermé de forme complexe comme illustré à la figure 1E (ici la pièce 11 a une section droite en croix à quatre branches).The
Au surplus, on notera que les arêtes arrondies 3 des empreintes 2 en forme de dièdre sont toutes positionnées sur un contour cylindrique de révolution, les dimensions des diverses parties déformées/pliées de la bande 1 étant choisies de manière que ce contour cylindrique 12 (dessiné en tirets à la figure 1D) possède sensiblement le même diamètre que le diamètre extérieur d'un tronçon tubulaire de montage.In addition, it will be noted that the
Puis, on enfile et on positionne la pièce en étoile 11 sur un tronçon tubulaire métallique 14 (figure 1F), les arêtes arrondies 3 des dièdres formés par les empreintes initiales 2 étant en appui contre la face externe du tronçon tubulaire 14. On peut souligner ici qu'il y a un intérêt à ce que le cylindre de révolution 12 de positionnement des arêtes arrondies 3 soit d'un diamètre très légèrement inférieur à celui de la face externe du tronçon tubulaire 14 de manière que la pièce en étoile 11 enserre élastiquement le tronçon tubulaire 14 sur lequel elle est insérée : la pièce en étoile 11 reste ainsi en place sans autre moyen de retenue en vue de l'opération suivante.Then, the
Enfin, on procède au soudage de la pièce en étoile 11 sur le tronçon tubulaire 14 : des cordons de soudure 15 (figure 1G) sont déposés, en deux passes circulaires, sur les bords supérieur et inférieur des arêtes arrondies 3, soit en huit emplacements dans l'exemple illustré à la figure 1G.Finally, the
Ensuite de quoi, on obtient, comme illustré à la figure 2, un élément vertical d'échafaudage, désigné dans son ensemble par la référence 16, qui est constitué d'un tronçon tubulaire 14 pourvu d'un nombre n (ici quatre) de douilles 17 en saillie radiale réparties périphériquement en étoile, destinées à l'accrochage d'une extrémité de traverse horizontale de l'échafaudage. La configuration de la pièce en étoile 11 et sa soudure sur le tronçon tubulaire 14 par des cordons de soudure 15 en arcs de cercle supérieurs et inférieurs sont bien visibles à la figure 2.Then, as illustrated in FIG. 2, there is obtained a vertical scaffolding element, generally designated by the
Le procédé de l'invention écarte les inconvénients liés à la fabrication et à la solidarisation des douilles individuelles. Il permet la fabrication de l'ensemble des douilles 17 sous forme intégrale, la pièce en étoile 11 pouvant être obtenue par mise en oeuvre de processus mécaniques simples. De plus, sa fixation sur le tronçon tubulaire nécessite deux opérations de soudure effectuées circulairement, de façon discontinue, sur le pourtour du tronçon tubulaire, et donc dans des conditions très simples. Ces deux opérations de soudure peuvent être effectuées en une seule passe en mettant en oeuvre deux appareillages de soudure, ou bien en deux passes successives.The method of the invention eliminates the disadvantages associated with the manufacture and joining of the individual sockets. It allows the manufacture of all
Dans l'exemple envisagé plus haut en regard des figures 1A à 1G et 2, on a supposé que les douilles avaient des faces latérales sensiblement parallèles, les opérations de pliage (figures 1C et 1D) étant menées en conséquence.In the example envisaged above with reference to FIGS. 1A to 1G and 2, it was assumed that the bushings had substantially parallel lateral faces, the folding operations (FIGS. 1C and 1D) being carried out accordingly.
Toutefois, l'invention n'est pas limitée à cette seule configuration et il est possible d'envisager une mise en oeuvre du procédé de l'invention propre à conduire à une pièce en étoile 11' dont les branches 17' possèdent une conformation différente, par exemple une conformation effilée comme illustré schématiquement à la figure 3. Les branches 17' peuvent avoir des parois convergentes réunies à leur extrémité par une partie transversale 5' aplatie ayant une largeur moindre que la partie 5 prévue aux figures 1A à 1G et 2. Voire la partie transversale 5' peut être réduite à néant et les parois convergent en se réunissant en pointe. Il suffit pour cela d'adapter en conséquence l'opération d'emboutissage de la figure 1B (empreintes 2 plus ou moins rapprochées, voire accolées), ainsi que les opérations de pliage des figures 1C et 1D (rapprochement des parois 4a, 4b de manière qu'elles convergent sans devenir parallèles).However, the invention is not limited to this single configuration and it is possible to envisage an implementation of the method of the invention to lead to a star part 11 'whose branches 17' have a different conformation , for example a tapered conformation as schematically illustrated in FIG. 3. The branches 17 'may have convergent walls joined at their end by a flattened transverse portion 5' having a width less than the
De plus l'invention n'est pas limitée à la fabrication d'éléments verticaux d'échafaudage équipés de quatre douilles. On peut, par le procédé de l'invention, fabriquer des éléments ayant un nombre n quelconque de douilles espacées angulairement de 2π/n; dans ce cas, les empreintes 2 sont formées, à l'étape d'emboutissage de la figure 2, avec des parois latérales 4a, 4b faisant entre elles un angle de 2π/n. A titre d'exemple, la figure 4 illustre schématiquement la conformation d'un élément vertical 16' incorporant une pièce en étoile 11" définissant trois douilles 17" espacées de 120°, avec des parois latérales convergentes selon les dispositions de la figure 3.In addition the invention is not limited to the manufacture of vertical scaffolding elements equipped with four sockets. It is possible, by the method of the invention, to manufacture elements having any number n of sockets angularly spaced by 2π / n ; in this case, the
Dans les exemples de réalisation qui viennent d'être décrits et qui sont illustrés aux figures 1A-1G et 2 à 4, les extrémités aboutées de la bande métallique repliée conformément au procédé de l'invention se situent approximativement sur l'extrémité d'une douille. Le cordon de soudure 13 solidarisant ces extrémités risque de constituer une gêne pour l'accrochage sur la douille d'organes d'échafaudage. Il peut donc s'avérer souhaitable de faire en sorte que lesdites extrémités aboutées se situent en dehors de l'extrémité de la douille, par exemple latéralement, voire préférentiellement dans une zone de la pièce en étoile 11 qui est en appui contre le tronçon tubulaire (c'est-à-dire dans l'angle rentrant séparant deux douilles consécutives) comme cela est clairement illustré à la figure 5. Dans un tel agencement, les extrémités haute et basse de la soudure 13 sont refondues lors des soudures de la pièce en étoile 11 sur le tronçon tubulaire, ce qui influe favorablement sur la qualité de ces soudures.In the embodiments which have just been described and which are illustrated in FIGS. 1A-1G and 2 to 4, the abutting ends of the folded metal strip according to the method of the invention are located approximately on the end of a socket. The
Enfin il peut s'avérer particulièrement intéressant, comme illustré à la figure 6, que les arêtes arrondies 3 soient conformées avec leur concavité tournée vers l'extérieur, de sorte que ces arêtes à conformation concave 18 épousent mieux le contour cylindrique du tronçon tubulaire 14 sur lequel elles sont appliquées et soudées.Finally, it may be particularly interesting, as illustrated in FIG. 6, for the
Claims (9)
- A method of manufacturing a vertical scaffolding element (16, 16') consisting of a tubular portion (14) to which is welded a star-shaped part (11) defining a number n of radially projecting sockets (17, 17', 17"), distributed peripherally in a star arrangement, intended for the attachment of one end of a horizontal crosspiece of the scaffolding, said process comprising the following steps:a) to stamp flat a plane metal strip (1) of a predetermined length at n regularly spaced locations so as to form n recesses (2) approximately in a dihedral arrangement (4a, 4b) with a rounded ridge (3) transverse to the length of the strip,b) then to fold said so shaped strip at the joins (7, 10) of the ends of the faces (4a, 4b) of the dihedrals with the intermediate regions (5) of the strip so as to bring closer to each other the lateral faces (4a, 4b) of two adjacent recesses (2) which are located on each side of an intermediate region (5) of the strip and so as to position the rounded ridges (3) of the recesses (2) on an axisymmetric cylindrical outline (12) having substantially the same diameter as the external diameter of the tubular portion (14) in order to close said strip on itself with free ends thereof being abutted and so to form a star-shaped member (11),c) to position said star-shaped member on said tubular portion with rounded ridges (3) of dihedrals formed by recesses (2) resting against the external surface of the tubular portion (14), andd) finally to weld said star-shaped member (11) to this latter,characterized in that- after step b) of forming the star-shaped member (11) and before step c), both abutted ends (6) of the strip are welded (13) to each other so as to obtain an integral star-shaped member, and- during step d), said integral star-shaped member (11) is secured to the tubular portion (14) only by discontinuous circular welds (15) made on the upper and lower edges of the rounded ridges (3) resting on the tubular portion (14).
- Method according to Claim 1, characterized in that the recesses (2) are formed as dihedrals (4a, 4b) which are open over an angle of 2π/n.
- Method according to Claim 1 or 2, characterized in that the stamped strip (1) is folded so as to bring the lateral faces (4a, 4b) of two adjacent recesses (2) into a substantially parallel mutual position.
- Method according to anyone of claims 1 to 3, characterized in that the number of recesses (2) is four and in that the angle α of opening of the dihedrals (4a, 4b) formed by the recesses (2) is about 90°, whereby a vertical scaffolding element (16) is obtained, consisting of a tubular portion (14) equipped with four sockets (17, 17') placed substantially in a cross arrangement.
- Method according to anyone of claims 1 to 4, characterized in that the metal strip is treated such that said abutted ends of the strip which are welded are located on the end of a socket.
- Method according to anyone of claims 1 to 5, characterized in that the metal strip is treated such that the said abutted ends of the strip which are welded are located away from the end of a socket.
- Method according to Claim 6, characterized in that the welded abutted ends of the strip are located in a region of the star-shaped member (11) which bears against the tubular portion (14).
- Method according to anyone of claims 1 to 7, characterized in that rounded ridges (3) are formed with their concavity turned outwards, so that these ridges can be applied tightly against the tubular portion (14).
- A vertical scaffolding element manufactured by implementing the method according to anyone of claims 1 to 8, said element consisting of a tubular portion (14) to which is welded a star-shaped part (11) defining a number n of radially projecting sockets (17, 17', 17"), distributed peripherally in a star arrangement, intended for the attachment of one end of a horizontal crosspiece of the scaffolding, said star-shaped part consisting of a stamped metal strip (1) which is folded and closed on itself with ends thereof being abutted and welded to each other, said star-shaped part having rounded ridges (3) on an axisymmetric cylindrical outline (12) having substantially the same diameter as the external diameter of the tubular portion (14), said star-shaped member (11) being secured to said tubular portion (14) only by discontinuous circular welds (15) made on the upper and lower edges of the rounded ridges (3) resting on the tubular portion (14).
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0104245A FR2822734B1 (en) | 2001-03-29 | 2001-03-29 | METHOD FOR MANUFACTURING A VERTICAL SCAFFOLDING ELEMENT, AND ELEMENT THUS OBTAINED |
| DE60221393T DE60221393T2 (en) | 2001-03-29 | 2002-09-13 | Process for the preparation of a vertical structural element, and element produced by the use of this process |
| ES02292249T ES2290260T3 (en) | 2001-03-29 | 2002-09-13 | MANUFACTURING PROCEDURE OF A VERTICAL ANDAMIAJE ELEMENT, AND ITEM SO OBTAINED. |
| DK02292249T DK1398431T3 (en) | 2001-03-29 | 2002-09-13 | Process for manufacturing a vertical scaffold element and the element thus obtained |
| EP02292249A EP1398431B1 (en) | 2001-03-29 | 2002-09-13 | Process for manufacturing a vertical scaffold element, and element obtained by using said process |
| AT02292249T ATE368159T1 (en) | 2001-03-29 | 2002-09-13 | METHOD FOR PRODUCING A VERTICAL SCAFFOLDING ELEMENT, AND ELEMENT PRODUCED BY USING THIS METHOD |
| PT02292249T PT1398431E (en) | 2001-03-29 | 2002-09-13 | Process for manufacturing a vertical scaffold element, and element obtained by using said process |
| US10/244,613 US7090052B2 (en) | 2001-03-29 | 2002-09-17 | Method of manufacturing a vertical scaffolding element, and element thus obtained |
| BR0203888-9A BR0203888A (en) | 2001-03-29 | 2002-09-25 | Manufacturing process of a vertical scaffolding element, and element thus obtained |
| JP2002284271A JP4125574B2 (en) | 2001-03-29 | 2002-09-27 | Method for producing vertical scaffold member and member obtained thereby |
| CY20071101244T CY1107604T1 (en) | 2002-09-13 | 2007-09-27 | METHOD OF PRODUCTION OF A CAPITAL CONSTRUCTION TEMPERATURE DATA AND HIS TEMPORARILY ITEM |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0104245A FR2822734B1 (en) | 2001-03-29 | 2001-03-29 | METHOD FOR MANUFACTURING A VERTICAL SCAFFOLDING ELEMENT, AND ELEMENT THUS OBTAINED |
| EP02292249A EP1398431B1 (en) | 2001-03-29 | 2002-09-13 | Process for manufacturing a vertical scaffold element, and element obtained by using said process |
| US10/244,613 US7090052B2 (en) | 2001-03-29 | 2002-09-17 | Method of manufacturing a vertical scaffolding element, and element thus obtained |
| BR0203888-9A BR0203888A (en) | 2001-03-29 | 2002-09-25 | Manufacturing process of a vertical scaffolding element, and element thus obtained |
| JP2002284271A JP4125574B2 (en) | 2001-03-29 | 2002-09-27 | Method for producing vertical scaffold member and member obtained thereby |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1398431A1 EP1398431A1 (en) | 2004-03-17 |
| EP1398431B1 true EP1398431B1 (en) | 2007-07-25 |
Family
ID=32719525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02292249A Expired - Lifetime EP1398431B1 (en) | 2001-03-29 | 2002-09-13 | Process for manufacturing a vertical scaffold element, and element obtained by using said process |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US7090052B2 (en) |
| EP (1) | EP1398431B1 (en) |
| JP (1) | JP4125574B2 (en) |
| AT (1) | ATE368159T1 (en) |
| BR (1) | BR0203888A (en) |
| DE (1) | DE60221393T2 (en) |
| DK (1) | DK1398431T3 (en) |
| ES (1) | ES2290260T3 (en) |
| FR (1) | FR2822734B1 (en) |
| PT (1) | PT1398431E (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2638365C (en) * | 2008-07-29 | 2011-07-12 | Peter J. Rogers | Twist lock coupling spigot |
| CN102367701A (en) * | 2011-11-28 | 2012-03-07 | 张雪山 | Quick connecting piece for scaffolds |
| JP5753620B1 (en) * | 2014-09-11 | 2015-07-22 | 竜也 近藤 | Construction of temporary scaffold for construction |
| CN115182571A (en) * | 2022-07-29 | 2022-10-14 | 北京建筑大学 | Double cross disc buckle type scaffold connecting node structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1521232A (en) * | 1966-04-29 | 1968-04-12 | Kwikform Ltd | Improvements made to scaffolding used in construction |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1553487A (en) * | 1968-02-09 | 1969-01-10 | ||
| FR2376275A1 (en) * | 1976-12-31 | 1978-07-28 | Self Lock Echafaudages | Connector for tubular scaffolding elements - uses square metal units with concave bent sides pitting against posts |
| GB2207875A (en) * | 1987-08-12 | 1989-02-15 | Homestead | Socket cluster for use in scaffolding |
-
2001
- 2001-03-29 FR FR0104245A patent/FR2822734B1/en not_active Expired - Fee Related
-
2002
- 2002-09-13 DE DE60221393T patent/DE60221393T2/en not_active Expired - Lifetime
- 2002-09-13 AT AT02292249T patent/ATE368159T1/en not_active IP Right Cessation
- 2002-09-13 DK DK02292249T patent/DK1398431T3/en active
- 2002-09-13 EP EP02292249A patent/EP1398431B1/en not_active Expired - Lifetime
- 2002-09-13 PT PT02292249T patent/PT1398431E/en unknown
- 2002-09-13 ES ES02292249T patent/ES2290260T3/en not_active Expired - Lifetime
- 2002-09-17 US US10/244,613 patent/US7090052B2/en not_active Expired - Fee Related
- 2002-09-25 BR BR0203888-9A patent/BR0203888A/en not_active Application Discontinuation
- 2002-09-27 JP JP2002284271A patent/JP4125574B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1521232A (en) * | 1966-04-29 | 1968-04-12 | Kwikform Ltd | Improvements made to scaffolding used in construction |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60221393T2 (en) | 2008-04-03 |
| JP2004116237A (en) | 2004-04-15 |
| US20040050622A1 (en) | 2004-03-18 |
| ATE368159T1 (en) | 2007-08-15 |
| JP4125574B2 (en) | 2008-07-30 |
| DK1398431T3 (en) | 2007-11-12 |
| ES2290260T3 (en) | 2008-02-16 |
| BR0203888A (en) | 2004-05-25 |
| EP1398431A1 (en) | 2004-03-17 |
| FR2822734B1 (en) | 2003-08-08 |
| PT1398431E (en) | 2007-10-08 |
| FR2822734A1 (en) | 2002-10-04 |
| US7090052B2 (en) | 2006-08-15 |
| DE60221393D1 (en) | 2007-09-06 |
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