EP0282424B1 - Poutre à treillis, en bois et métal - Google Patents

Poutre à treillis, en bois et métal 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
Authority
EP
European Patent Office
Prior art keywords
metal
wood
wooden
bent
chords
Prior art date
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.)
Expired - Lifetime
Application number
EP88420071A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0282424A1 (fr
Inventor
Claude Ivorra
Claude Hissler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Possani Te St Orens-De-Gameville Frankrij
Original Assignee
Possani Robert
Phenol Engineering SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Possani Robert, Phenol Engineering SA filed Critical Possani Robert
Priority to AT88420071T priority Critical patent/ATE69850T1/de
Publication of EP0282424A1 publication Critical patent/EP0282424A1/fr
Application granted granted Critical
Publication of EP0282424B1 publication Critical patent/EP0282424B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Joining Of Building Structures In Genera (AREA)
EP88420071A 1987-02-26 1988-02-26 Poutre à treillis, en bois et métal Expired - Lifetime EP0282424B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88420071T ATE69850T1 (de) 1987-02-26 1988-02-26 Holz- und metallgittertraeger.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8703197 1987-02-26
FR8703197A FR2611857B1 (fr) 1987-02-26 1987-02-26 Poutre a treillis, en bois et metal

Publications (2)

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

Family

ID=9348756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420071A Expired - Lifetime EP0282424B1 (fr) 1987-02-26 1988-02-26 Poutre à treillis, en bois et métal

Country Status (6)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2197299C (en) * 1994-08-12 2006-05-16 Morris Nankin Structural beam and web
GB2354015B (en) * 1999-07-07 2003-07-09 Shelthire Ltd Load-bearing beam
SE520873C2 (sv) * 2001-12-17 2003-09-09 Benny Refond Skivformigt byggelement med förbindningsorgan bestående av lameller i ett sicksackmönster
DE102008010154B3 (de) * 2008-02-20 2009-10-08 Lothar Bitschnau Schalung

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 (fr) * 1957-06-14 1959-04-03 Profil Sa Ind Financ Le Poutrelle de construction
FR2209031B1 (el) * 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
ES2029063T3 (es) 1992-07-16
EP0282424A1 (fr) 1988-09-14
DE3866382D1 (de) 1992-01-09
FR2611857A1 (fr) 1988-09-09
ATE69850T1 (de) 1991-12-15
FR2611857B1 (fr) 1989-05-26
GR3003918T3 (el) 1993-03-16

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