EP0282424B1 - Wood-and-metal truss girder - Google Patents

Wood-and-metal truss girder Download PDF

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Publication number
EP0282424B1
EP0282424B1 EP88420071A EP88420071A EP0282424B1 EP 0282424 B1 EP0282424 B1 EP 0282424B1 EP 88420071 A EP88420071 A EP 88420071A EP 88420071 A EP88420071 A EP 88420071A EP 0282424 B1 EP0282424 B1 EP 0282424B1
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EP
European Patent Office
Prior art keywords
metal
wood
wooden
bent
chords
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Expired - Lifetime
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EP88420071A
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German (de)
French (fr)
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EP0282424A1 (en
Inventor
Claude Ivorra
Claude Hissler
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Robert Possani Te St Orens-De-Gameville Frankrij
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Possani Robert
Phenol Engineering SA
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Priority to AT88420071T priority Critical patent/ATE69850T1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
    • E04B1/5837—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form
    • E04B1/5843—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form with ends provided with protuberances
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/292—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being wood and metal

Definitions

  • the present invention relates to a lattice beam, made of wood and metal, with two wooden frames joined to one another by a lattice of metal oblique bars, constituted by a metal tube bent in a zig-zag, the successive sections of which constitute the oblique bars, the elbows of the metal tube bent in a zig-zag having flattenings which are joined alternately to the two wooden frames.
  • the two wooden frames are joined to each other by a metal wire of sinusoidal shape.
  • the bases and tops of the "waves" formed by the metal wire are embedded and glued into the wood of the frames. Due to the small dimensions of the trellis consisting of a simple metal wire, this beam structure has poor buckling resistance. Such a beam structure can only be envisaged with dimensions and in particular reduced spans, which greatly limits its applications.
  • the realization of this type of truss is dependent on the quality of the bonding of the metal wire on the wooden frames, and from this point of view it requires very careful manufacturing therefore expensive.
  • a "wood + metal” composite beam the two wooden frames are joined to one another by lateral metal connectors, in the shape of a "V", which are applied and fixed against the lateral faces. of the two members.
  • the connectors are fixed to the members by stapling, and the mechanical properties of the beam are here dependent on the quality of the stapling.
  • the members must be made of high quality wood, therefore expensive, in particular a wood with a low knot rate.
  • Metal connectors require special preparation including a drawing operation to form the stapling pins.
  • the lateral position of the connectors does not allow a distribution of the forces transmitted over the entire width of the members, and this arrangement reduces the accessibility to the lateral faces of the members, therefore complicates the assembly operations of this type of beam with d other elements.
  • the mesh of metal oblique bars is constituted by a metal tube bent in a zig-zag, the successive sections of which constitute the oblique bars of the mesh.
  • the bends of the metal tube bent in a zig-zag have flattenings which are joined alternately to the two wooden frames.
  • the flattened parts of the tube bent in a zig-zag are assembled by welding to longitudinal profiles of "U" section, which receive the wooden pieces of the frames, the profiles in "U” being linked in only a few points to wooden parts.
  • the present invention aims to eliminate all the drawbacks of the currently known embodiments, in particular by providing a truss beam in which all the longitudinal faces of the two wooden frames remain accessible, and in which the metal parts and the wooden parts are married so intimate, for an optimal transmission of the forces between the trellis and the members, while preserving for the trellis an economic realization from an initially rectilinear tube, flattened at regular intervals and bent in zig-zag.
  • connection of the metal tube bent in a zig-zag with the two wooden frames is carried out by means of collars each embracing one of the frames wood and a flattened area of the metal tube bent in a zig-zag.
  • the metal tube bent in a zig-zag, has an oval section whose largest dimension extends transversely to the general plane of the beam; the oval section facilitates the flattening operation of the tube, and it frees up maximum space for the crossing of the beam by other elements, such as pipes.
  • the flattened zones of the metal tube, bent in a zig-zag have a width substantially equal to the width of each. members.
  • the flattened areas of the metal tube allow a simple mechanical connection that is resistant to the "knots" of the structure, thanks to the collars which each embrace one of the frames and a flattened area of the metal tube bent in a zig-zag.
  • It may be, in particular, metal collars made for example from a strip, which are closed on themselves by a weld.
  • the welding of each collar is carried out between the ends of the two oblique bars ending in the flattened zone of the tube entwined by this collar. In this way, the welding is carried out entirely in contact with and in the vicinity of metal parts, therefore without the risk of burning the wood of the members. This welding is possible by any process, such as "laser” or "micro-plasma".
  • the necklaces are put in place by making local crushing of the two wooden frames.
  • the meeting of the metal tube bent in a zig-zag with the members is accompanied by a compression of the wood, locally increasing its density and its resistance.
  • the local crushing of the wood of the frames is such that the collars take place inside the initial volume of the frames, which thus retain faces without protrusion, practically smooth, facilitating the assembly of the beam to neighboring parts. In this way, a real embedding is obtained, which intimately combines the wooden parts and the metal parts.
  • the "nodes" of the truss object of the invention are preferably made, by a suitable choice of the length of the flattened areas of the tube, so that the respective axes of two oblique bars, constituted by two successive sections of the metal tube bent in a zig-zag, compete at a point located on the axis of a wooden frame, therefore on the neutral fiber of this frame.
  • the truss shown in Figure 1, comprises two frames 1 and 2 made of wood, which in the example considered are rectilinear, parallel and of the same length.
  • the two wooden frames 1 and 2 each have a rectangular section - see also Figure 2.
  • the two members 1 and 2 are joined to one another by oblique bars 3, constituting the trellis of the beam.
  • this trellis is metallic and consists of a tube 4, bent in a zig-zag so that each straight section of this bent tube 4 constitutes one of the oblique bars 3.
  • the upper elbows of the bent tube 4 are joined to the upper wooden frame 1 by metal collars 5.
  • the lower elbows of the bent tube 4 are joined to the lower wooden frame 2 by metal collars 6.
  • the metal tube 4 has an oval section - see Figure 2.
  • the largest dimension of the oval section of the tube 4 is oriented transversely to the general plane of the beam.
  • Figures 2 and 3 show more precisely a "knot" of the beam, that is to say the part where two oblique bars 3 consecutive are joined to one of the members 2, by means of a collar 6.
  • the tube 4 has a flattening, as indicated in 7.
  • the collar 6 embraces the frame 2 and the flattened area 7 of the tube 4, which has a width substantially equal to that of the frame 2.
  • This collar 6 is closed on itself by a longitudinal weld 8, produced in its upper part between the ends of the two bars 3.
  • the width of the collar 6 corresponds to the length of the flattened area 7 of the tube 4.
  • the establishment of the collar 6 is carried out by carrying out, as indicated by arrows 9 and 10, a crimping which leads to a local crushing, on the surface, of the wooden frame 2.
  • the collar 6 takes place at the inside the initial volume of the member 2, so that in the final state of the beam member 2 retains substantially smooth faces.
  • the compression obtained by means of the collar 6 ensures the solidity of the assembly and the distribution of the forces.
  • the respective axes 11 and 12 of the two consecutive oblique bars 3 compete at a point situated on the axis 13, therefore on the neutral fiber of the frame 2.
  • the wooden and metal truss beam previously described, is applicable to the production of various structures, in particular in the field of building and civil engineering.
  • This beam can be used alone or with other similar beams, to form two-dimensional or three-dimensional structures.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Composite Materials (AREA)
  • Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

The girder comprises two wooden flanges (1,2) joined together by metallic oblique bars (3). These bars are formed by successive sections of a metallic tube (4) folded in a zig-zag manner. The elbows of the folded tube (4) have flattened regions and are joined together alternately to the two flanges (1,2) by means of brackets (5,6). This beam is applicable for producing diverse structures. <IMAGE>

Description

La présente invention concerne une poutre à treillis, en bois et métal, avec deux membrures en bois réunies l'une à l'autre par un treillis de barres obliques métalliques, constitué par un tube métallique plié en zig-zag, dont les tronçons successifs constituent les barres obliques, les coudes du tube métallique plié en zig-zag présentant des aplatissements qui sont réunis alternativement aux deux membrures en bois.The present invention relates to a lattice beam, made of wood and metal, with two wooden frames joined to one another by a lattice of metal oblique bars, constituted by a metal tube bent in a zig-zag, the successive sections of which constitute the oblique bars, the elbows of the metal tube bent in a zig-zag having flattenings which are joined alternately to the two wooden frames.

Des poutres composites "bois + métal" sont déjà connues, sous les trois formes suivantes:Composite "wood + metal" beams are already known, in the following three forms:

Dans une première réalisation connue, les deux membrures en bois sont réunies l'une à l'autre par un fil métallique de forme sinusoïdale. Les bases et les sommets des "ondes" formées par le fil métallique sont noyés et collés dans le bois des membrures. En raison des faibles dimensions du treillis constitué par un simple fil métallique, cette structure de poutre possède une mauvaise résistance au flambement. Une telle structure de poutre n'est envisageable qu'avec des dimensions et notamment des portées réduites, ce qui en limite fortement les applications. De plus, la réalisation de ce type de poutre à treillis est tributaire de la qualité du collage du fil métallique sur les membrures en bois, et de ce point de vue elle nécessite une fabrication très soignée donc coûteuse.In a first known embodiment, the two wooden frames are joined to each other by a metal wire of sinusoidal shape. The bases and tops of the "waves" formed by the metal wire are embedded and glued into the wood of the frames. Due to the small dimensions of the trellis consisting of a simple metal wire, this beam structure has poor buckling resistance. Such a beam structure can only be envisaged with dimensions and in particular reduced spans, which greatly limits its applications. In addition, the realization of this type of truss is dependent on the quality of the bonding of the metal wire on the wooden frames, and from this point of view it requires very careful manufacturing therefore expensive.

Dans une deuxième réalisation connue de poutre composite "bois+métal", les deux membrures en bois sont réunies l'une à l'autre par des connecteurs latéraux métalliques, en forme de "V", qui sont appliqués et fixés contre les faces latérales des deux membrures. La fixation des connecteurs aux membrures est réalisée par agrafage, et les propriétés mécaniques de la poutre sont ici tributaires de la qualité de l'agrafage. Ainsi, les membrures doivent être constituées en un bois de haute qualité, donc onéreux, notamment un bois avec un faible taux de noeuds. Les connecteurs métalliques nécessitent, quant à eux, une préparation particulière comprenant une opération d'emboutissage pour former les picots d'agrafage. Par ailleurs, la position latérale des connecteurs ne permet pas une répartition des efforts transmis sur toute la largeur des membrures, et cette disposition réduit l'accessibilité aux faces latérales des membrures, donc complique les opérations d'assemblage de ce genre de poutres avec d'autres éléments.In a second known embodiment of a "wood + metal" composite beam, the two wooden frames are joined to one another by lateral metal connectors, in the shape of a "V", which are applied and fixed against the lateral faces. of the two members. The connectors are fixed to the members by stapling, and the mechanical properties of the beam are here dependent on the quality of the stapling. Thus, the members must be made of high quality wood, therefore expensive, in particular a wood with a low knot rate. Metal connectors require special preparation including a drawing operation to form the stapling pins. Furthermore, the lateral position of the connectors does not allow a distribution of the forces transmitted over the entire width of the members, and this arrangement reduces the accessibility to the lateral faces of the members, therefore complicates the assembly operations of this type of beam with d other elements.

Dans une troisième réalisation, connue par le document FR-A-1176026, le treillis de barres obliques métalliques est constitué par un tube métallique plié en zig-zag, dont les tronçons successifs constituent les barres obliques du treillis. Les coudes du tube métallique plié en zig-zag présentent des aplatissements qui sont réunis alternativement aux deux membrures en bois.In a third embodiment, known from the document FR-A-1176026, the mesh of metal oblique bars is constituted by a metal tube bent in a zig-zag, the successive sections of which constitute the oblique bars of the mesh. The bends of the metal tube bent in a zig-zag have flattenings which are joined alternately to the two wooden frames.

Toutefois, dans la réalisation selon le document FR-A-1176026, les parties aplaties du tube plié en zig-zag sont assemblées par soudage à des profilés longitudinaux de section en "U", qui reçoivent les pièces en bois des membrures, les profilés en "U" étant liés en quelques points seulement aux pièces en bois.However, in the embodiment according to document FR-A-1176026, the flattened parts of the tube bent in a zig-zag are assembled by welding to longitudinal profiles of "U" section, which receive the wooden pieces of the frames, the profiles in "U" being linked in only a few points to wooden parts.

Ces profilés recouvrent ainsi trois des quatre faces longitudinales des pièces en bois, et l'on retrouve ici le problème de l'accessibilité aux faces latérales des membrures, nécessaire par les opérations d'assemblage de la poutre avec d'autres éléments. Par ailleurs, la réalisation selon le document FR-A-1176026 ne réalise pas une liaison intime entre les parties métalliques de la poutre et ses parties en bois.These sections thus cover three of the four longitudinal faces of the wooden parts, and here we find the problem of accessibility to the lateral faces of the members, necessary by the operations of assembling the beam with other elements. Furthermore, the embodiment according to document FR-A-1176026 does not produce an intimate connection between the metal parts of the beam and its wooden parts.

La présente invention vise à éliminer tous les inconvénients des réalisations actuellement connues, notamment en fournissant une poutre à treillis dans laquelle toutes les faces longitudinales des deux membrures en bois restent accessibles, et dans laquelle les parties métalliques et les parties en bois sont mariées de façon intime, pour une transmission optimale des efforts entre le treillis et les membrures, tout en conservant pour le treillis une réalisation économique à partir d'un tube initialement rectiligne, aplati à intervalles réguliers et plié en zig-zag.The present invention aims to eliminate all the drawbacks of the currently known embodiments, in particular by providing a truss beam in which all the longitudinal faces of the two wooden frames remain accessible, and in which the metal parts and the wooden parts are married so intimate, for an optimal transmission of the forces between the trellis and the members, while preserving for the trellis an economic realization from an initially rectilinear tube, flattened at regular intervals and bent in zig-zag.

A cet effet, dans la poutre à treillis en bois et métal, objet de l'invention, la liaison du tube métallique plié en zig-zag avec les deux membrures en bois est réalisée au moyen de colliers enlaçant chacun l'une des membrures en bois et une zone aplatie du tube métallique plié en zig-zag.To this end, in the wooden and metal truss beam, object of the invention, the connection of the metal tube bent in a zig-zag with the two wooden frames is carried out by means of collars each embracing one of the frames wood and a flattened area of the metal tube bent in a zig-zag.

Avantageusement, le tube métallique, plié en zig-zag, possède une section ovale dont la plus grande dimension s'étend transversalement au plan général de la poutre; la section ovale facilite l'opération d'aplatissement du tube, et elle libère un maximum d'espace pour la traversée de la poutre par d'autres éléments, tels que des tuyaux.Advantageously, the metal tube, bent in a zig-zag, has an oval section whose largest dimension extends transversely to the general plane of the beam; the oval section facilitates the flattening operation of the tube, and it frees up maximum space for the crossing of the beam by other elements, such as pipes.

Dans le cas d'une poutre avec deux membrures en bois de section rectangulaire, les zones aplaties du tube métallique, plié en zig-zag, possèdent une largeur sensiblement égale à la largeur de chacune des membrures.In the case of a beam with two wooden members of rectangular section, the flattened zones of the metal tube, bent in a zig-zag, have a width substantially equal to the width of each. members.

Les zones aplaties du tube métallique permettent de réaliser une liaison mécanique simple et résistante aux "noeuds" de la structure, grâce aux colliers qui enlacent, chacun, l'une des membrures et une zone aplatie du tube métallique plié en zig-zag. Il peut s'agir, notamment, de colliers métalliques réalisés par exemple à partir d'un feuillard, qui sont fermés sur eux-mêmes par une soudure. De préférence, la soudure de chaque collier est réalisée entre les extrémités des deux barres obliques aboutissant à la zone aplatie du tube enlacée par ce collier. De cette manière, la soudure est réalisée entièrement au contact et au voisinage de parties métalliques, donc sans risque de brûler le bois des membrures. Cette soudure est réalisable par tout procédé, tel que "laser" ou "micro-plasma".The flattened areas of the metal tube allow a simple mechanical connection that is resistant to the "knots" of the structure, thanks to the collars which each embrace one of the frames and a flattened area of the metal tube bent in a zig-zag. It may be, in particular, metal collars made for example from a strip, which are closed on themselves by a weld. Preferably, the welding of each collar is carried out between the ends of the two oblique bars ending in the flattened zone of the tube entwined by this collar. In this way, the welding is carried out entirely in contact with and in the vicinity of metal parts, therefore without the risk of burning the wood of the members. This welding is possible by any process, such as "laser" or "micro-plasma".

Avantageusement, les colliers sont mis en place en réalisant un écrasement local des deux membrures en bois. Ainsi, la réunion du tube métallique plié en zig-zag avec les membrures s'accompagne d'une mise en compression du bois, augmentant localement sa densité et sa résistance. De préférence l'écrasement local du bois des membrures est tel que les colliers prennent place à l'intérieur du volume initial des membrures, qui conservent ainsi des faces sans saillie, pratiquement lisses, facilitant l'assemblage de la poutre à des pièces voisines. On obtient de cette manière un véritable encastrement, qui marie intimement les parties en bois et les parties métallique.Advantageously, the necklaces are put in place by making local crushing of the two wooden frames. Thus, the meeting of the metal tube bent in a zig-zag with the members is accompanied by a compression of the wood, locally increasing its density and its resistance. Preferably the local crushing of the wood of the frames is such that the collars take place inside the initial volume of the frames, which thus retain faces without protrusion, practically smooth, facilitating the assembly of the beam to neighboring parts. In this way, a real embedding is obtained, which intimately combines the wooden parts and the metal parts.

Les "noeuds" de la poutre à treillis objet de l'invention sont de préférence réalisés, par un choix convenable de la longueur des zones aplaties du tube, de telle sorte que les axes respectifs de deux barres obliques, constituées par deux tronçons successifs du tube métallique plié en zig-zag, concourent en un point situé sur l'axe d'une membrure en bois, donc sur la fibre neutre de cette membrure.The "nodes" of the truss object of the invention are preferably made, by a suitable choice of the length of the flattened areas of the tube, so that the respective axes of two oblique bars, constituted by two successive sections of the metal tube bent in a zig-zag, compete at a point located on the axis of a wooden frame, therefore on the neutral fiber of this frame.

On notera que la longueur des zones aplaties du tube doit aussi correspondre à la largeur des colliers.Note that the length of the flattened areas of the tube must also correspond to the width of the collars.

De toute façon, l'invention sera mieux comprise à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme d'exécution de cette poutre à treillis:

  • Figure 1 est une vue de face d'une poutre à treillis, en bois et métal, conforme à la présente invention;
  • Figure 2 est une vue partielle en perspective, montrant un détail de la poutre de figure 1;
  • Figure 3 est une vue en coupe longitudinale de la partie de poutre visible à la figure 2.
In any case, the invention will be better understood with the aid of the description which follows, with reference to the appended diagrammatic drawing representing, by way of nonlimiting example, an embodiment of this truss beam:
  • Figure 1 is a front view of a truss, wooden and metal, according to the present invention;
  • Figure 2 is a partial perspective view showing a detail of the beam of Figure 1;
  • FIG. 3 is a view in longitudinal section of the beam part visible in FIG. 2.

La poutre à treillis, représentée à la figure 1, comprend deux membrures 1 et 2 réalisées en bois, qui dans l'exemple considéré sont rectilignes, parallèles et de même longueur. Les deux membrures en bois 1 et 2 possèdent, chacune, une section rectangulaire ― voir aussi figure 2.The truss, shown in Figure 1, comprises two frames 1 and 2 made of wood, which in the example considered are rectilinear, parallel and of the same length. The two wooden frames 1 and 2 each have a rectangular section - see also Figure 2.

Les deux membrures 1 et 2 sont réunies l'une à l'autre par des barres obliques 3, constituant le treillis de la poutre. Selon l'invention, ce treillis est métallique et constitué par un tube 4, plié en zig-zag de sorte que chaque tronçon rectiligne de ce tube plié 4 constitue l'une des barres obliques 3. Les coudes supérieurs du tube plié 4 sont réunis à la membrure en bois supérieure 1 par des colliers métalliques 5. De même, les coudes inférieurs du tube plié 4 sont réunis à la membrure en bois inférieure 2 par des colliers métalliques 6.The two members 1 and 2 are joined to one another by oblique bars 3, constituting the trellis of the beam. According to the invention, this trellis is metallic and consists of a tube 4, bent in a zig-zag so that each straight section of this bent tube 4 constitutes one of the oblique bars 3. The upper elbows of the bent tube 4 are joined to the upper wooden frame 1 by metal collars 5. Similarly, the lower elbows of the bent tube 4 are joined to the lower wooden frame 2 by metal collars 6.

Dans l'exemple représenté au dessin, le tube métallique 4 possède une section ovale ― voir figure 2. La plus grande dimension de la section ovale du tube 4 est orientée transversalement au plan général de la poutre.In the example shown in the drawing, the metal tube 4 has an oval section - see Figure 2. The largest dimension of the oval section of the tube 4 is oriented transversely to the general plane of the beam.

Les figures 2 et 3 montrent plus précisément un "noeud" de la poutre, c'est-à-dire la partie où deux barres obliques 3 consécutives sont réunies à l'une des membrures 2, au moyens d'un collier 6. Dans cette partie, le tube 4 présente un aplatissement, comme indiqué en 7. Le collier 6 enlace la membrure 2 et la zone aplatie 7 du tube 4, laquelle possède une largeur sensiblement égale à celle de la membrure 2. Ce collier 6 est fermé sur lui-même par une soudure longitudinale 8, réalisée dans sa partie supérieure entre les extrémités des deux barres 3. La largeur du collier 6 correspond à la longueur de la zone aplatie 7 du tube 4.Figures 2 and 3 show more precisely a "knot" of the beam, that is to say the part where two oblique bars 3 consecutive are joined to one of the members 2, by means of a collar 6. In this part, the tube 4 has a flattening, as indicated in 7. The collar 6 embraces the frame 2 and the flattened area 7 of the tube 4, which has a width substantially equal to that of the frame 2. This collar 6 is closed on itself by a longitudinal weld 8, produced in its upper part between the ends of the two bars 3. The width of the collar 6 corresponds to the length of the flattened area 7 of the tube 4.

La mise en place du collier 6 est effectuée en réalisant, comme indiqué par des flèches 9 et 10, un sertissage qui conduit à un écrasement local, en surface, de la membrure en bois 2. Ainsi, le collier 6 prend place à l'intérieur du volume initial de la membrure 2, de sorte que dans l'état définitif de la poutre la membrure 2 conserve des faces pratiquement lisses. La compression obtenue au moyen du collier 6 assure la solidité de l'assemblage et la répartition des efforts. A ce sujet, on note que dans une disposition préférentielle, les axes respectifs 11 et 12 des deux barres obliques 3 consécutives concourent en un point situé sur l'axe 13, donc sur la fibre neutre de la membrure 2.The establishment of the collar 6 is carried out by carrying out, as indicated by arrows 9 and 10, a crimping which leads to a local crushing, on the surface, of the wooden frame 2. Thus, the collar 6 takes place at the inside the initial volume of the member 2, so that in the final state of the beam member 2 retains substantially smooth faces. The compression obtained by means of the collar 6 ensures the solidity of the assembly and the distribution of the forces. In this regard, it is noted that in a preferred arrangement, the respective axes 11 and 12 of the two consecutive oblique bars 3 compete at a point situated on the axis 13, therefore on the neutral fiber of the frame 2.

La poutre à treillis en bois et métal, précédemment décrite, est applicable à la réalisation de structures diverses, notamment dans le domaine du bâtiment et du génie civil. Cette poutre est utilisable seule ou avec d'autres poutres similaires, pour former des structures bidimensionnelles ou tridimensionnelles.The wooden and metal truss beam, previously described, is applicable to the production of various structures, in particular in the field of building and civil engineering. This beam can be used alone or with other similar beams, to form two-dimensional or three-dimensional structures.

Comme il va de soi, l'invention ne se limite pas à la seule forme d'exécution de cette poutre à treillis qui a été décrite ci-dessus, à titre d'exemple; elle en embrasse, au contraire, toutes les variantes de réalisation et d'application respectant le même principe tel que défini par les revendications. En particulier, l'on ne s'éloignerait pas du cadre de l'invention:

  • ― en prévoyant des membrures en bois 1 et 2 de longueurs différentes, notamment une membrure inférieure 2 plus courte pour la réalisation d'une poutre en "bateau";
  • ― en modifiant la section des membrures en bois 1 et 2, notamment en prévoyant pour ces membrures une section de forme générale rectangulaire avec des angles arrondis, autour desquels s'enroulent les colliers 5 et 6 qui réunissent ces membrures 1 et 2 aux zones aplaties 7 du tube métallique 4 plié en zig-zag, ce qui peut faciliter la mise en place des colliers;
  • ― en modifiant la section du tube métallique 4 ou les angles d'inclinaison des barres obliques 3 formées par ce tube;
  • ― en réalisant tous aménagements aux extrémités de la poutre, en vue de son appui, de son assemblage ou de son encastrement.
It goes without saying that the invention is not limited to the sole embodiment of this truss beam which has been described above, by way of example; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle as defined by the claims. In particular, we would not depart from the scope of the invention:
  • - by providing wooden members 1 and 2 of different lengths, in particular a lower member 2 shorter for the realization of a beam in "boat";
  • - by modifying the section of the wooden frames 1 and 2, in particular by providing for these frames a generally rectangular section with rounded angles, around which the collars 5 and 6 are wound which join these frames 1 and 2 to the flattened areas 7 of the metal tube 4 bent in a zig-zag, which can facilitate the fitting of the collars;
  • - By modifying the section of the metal tube 4 or the angles of inclination of the oblique bars 3 formed by this tube;
  • - by making all arrangements at the ends of the beam, with a view to supporting it, assembling it or fitting it in.

Claims (10)

1. A lattice girder of wood and metal, having two wooden chords (1, 2) joined together by a lattice of oblique metal bars (3), constituted by a metal tube (4) bent into a zigzag, of which the successive sections constitute the oblique bars (3), the elbows of the metal tube (4) bent into a zigzag having flattened areas (7) which are alternately joined to the two wooden chords (1, 2), characterised in that the connection of the metal tube (4) to the two wooden chords (1, 2) is effected by means of collars (5, 6) each encircling one of the wooden chords (1, 2) and a flattened area (7) of the metal tube (4) bent into a zigzag.
2. A lattice girder of wood and metal according to Claim 1, characterised in that the metal tube (4) bent into a zigzag has an oval section of which the largest dimension extends transversely to the general plane of the girder.
3. A lattice girder of wood and metal according to Claim 1 or Claim 2, having two wooden chords (1, 2) of rectangular section, characterised in that the flattened areas (7) of the metal tube (4), bent into a zigzag, have a width substantially equal to the width of each of the chords (1, 2).
4. A lattice girder of wood and metal, according to any one of Claims 1 to 3, characterised in that the collars (5, 6) joining the wooden chords (1, 2) to the flattened areas (7) of the metal tube (4) bent into a zigzag, are metal collars closed on themselves by welds (8).
5. A lattice girder of wood and metal according to Claim 4, characterised in that the weld (8) of each collar (5, 6) is made between the ends of the two oblique bars (3) ending at the flattened area (7) of the tube (4) encircled by this collar (5, 6).
6. A lattice girder of wood and metal according to any one of Claims 1 to 5, characterised in that the length of the flattened areas (7) of the tube (4) correspond to the width of the collars (5, 6).
7. A lattice girder of wood and metal according to any one of Claims 1 to 6, characterised in that the collars (5, 6) are positioned by effecting a local crushing of the two wooden chords (1, 2).
8. A lattice girder of wood and metal according to Claim 7, characterised in that the local crushing of the wood of the chords (1, 2) is such that the collars (5, 6) are positioned within the initial volume of the chords (1, 2).
9. A lattice girder of wood and metal according to any one of Claims 1 to 8, characterised in that the respective axes (11, 12) of the two oblique bars (3) constituted by the successive sections of the metal tube (4) bent into a zigzag, converge at a point located on the axis (13) of a wooden chord (1, 2).
10. A lattice girder of wood and metal according to any one of Claims 1 to 9, characterised in that the two wooden chords (1, 2) have a section of generally rectangular shape, with rounded angles which are encircled by the collars (5, 6) which join these chords (1, 2) to the flattened areas (7) of the metal tube (4) bent into a zigzag.
EP88420071A 1987-02-26 1988-02-26 Wood-and-metal truss girder Expired - Lifetime EP0282424B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88420071T ATE69850T1 (en) 1987-02-26 1988-02-26 WOOD AND METAL LATTICE CARRIER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8703197 1987-02-26
FR8703197A FR2611857B1 (en) 1987-02-26 1987-02-26 LATTICE, WOOD AND METAL BEAM

Publications (2)

Publication Number Publication Date
EP0282424A1 EP0282424A1 (en) 1988-09-14
EP0282424B1 true EP0282424B1 (en) 1991-11-27

Family

ID=9348756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420071A Expired - Lifetime EP0282424B1 (en) 1987-02-26 1988-02-26 Wood-and-metal truss girder

Country Status (6)

Country Link
EP (1) EP0282424B1 (en)
AT (1) ATE69850T1 (en)
DE (1) DE3866382D1 (en)
ES (1) ES2029063T3 (en)
FR (1) FR2611857B1 (en)
GR (1) GR3003918T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996005385A1 (en) * 1994-08-12 1996-02-22 Techtruss Holdings Pty. Ltd. Structural beam and web
GB2354015B (en) * 1999-07-07 2003-07-09 Shelthire Ltd Load-bearing beam
SE520873C2 (en) * 2001-12-17 2003-09-09 Benny Refond Disc shaped building element with connecting members consisting of slats in a zigzag pattern
DE102008010154B3 (en) * 2008-02-20 2009-10-08 Lothar Bitschnau Formwork, particularly sliding framework for producing concrete bodies, has frame work panel and two girders arranged spatially from each other, where girders have longitudinal sides extending into longitudinal direction

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544278A (en) * 1940-09-12 1942-04-07 Max Fiedler Means for the mounting of clamps on wooden objects
FR1176026A (en) * 1957-06-14 1959-04-03 Profil Sa Ind Financ Le Construction beam
FR2209031B1 (en) * 1972-12-06 1976-10-29 Dolleans Const Expl Agri
GB1602959A (en) * 1977-05-04 1981-11-18 Wemyss G A Connection means for tubular members

Also Published As

Publication number Publication date
DE3866382D1 (en) 1992-01-09
FR2611857B1 (en) 1989-05-26
GR3003918T3 (en) 1993-03-16
EP0282424A1 (en) 1988-09-14
ES2029063T3 (en) 1992-07-16
ATE69850T1 (en) 1991-12-15
FR2611857A1 (en) 1988-09-09

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