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EP0607805B1 - Poutre en bois moulée et procédé pour sa fabrication - Google Patents

Poutre en bois moulée et procédé pour sa fabrication Download PDF

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Publication number
EP0607805B1
EP0607805B1 EP94100123A EP94100123A EP0607805B1 EP 0607805 B1 EP0607805 B1 EP 0607805B1 EP 94100123 A EP94100123 A EP 94100123A EP 94100123 A EP94100123 A EP 94100123A EP 0607805 B1 EP0607805 B1 EP 0607805B1
Authority
EP
European Patent Office
Prior art keywords
core
beam body
channel
wood
moulded
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
EP94100123A
Other languages
German (de)
English (en)
Other versions
EP0607805A1 (fr
Inventor
Karl Moser
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0607805A1 publication Critical patent/EP0607805A1/fr
Application granted granted Critical
Publication of EP0607805B1 publication Critical patent/EP0607805B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N5/00—Manufacture of non-flat articles
    • B27N5/02—Hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/28—Moulding or pressing characterised by using extrusion presses
    • 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
    • E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
    • E04C3/18—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with metal or other reinforcements or tensioning members
    • 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
    • E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
    • E04C3/18—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with metal or other reinforcements or tensioning members
    • E04C3/185—Synthetic reinforcements
    • 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

Definitions

  • the invention relates to a method for producing a shaped wood beam, the molded body of which is molded from wood particles and binder, in particular extruded, in its longitudinal direction contains at least one channel extending essentially over the entire length of the beam.
  • the essentially rectangular cross-section of the beam body of the known molded wood beams is covered with solid wood boards on opposite sides and has a continuous channel in the middle, which on the one hand should reduce the total weight of the molded wood beam and on the other hand should accelerate the drying and curing process in the manufacture of the beam body .
  • a profile element which comprises a profile body with one or more hollow chambers.
  • the profile body is made of a plastic-fiber mixture, whereby wood fibers can be used.
  • Cores made of metal or a fiber material are inserted into the hollow chambers of the profile body.
  • the spaces between the cores and the inner walls of the hollow chambers are filled with a plastic-fiber mixture.
  • the cores are not pretensioned. They are only subjected to tension when the profile element is bent transversely to its longitudinal direction. Both the fillings and the cores serve to increase the strength and resilience of the profile element.
  • the cores are made of a material with higher bending and tensile strength in relation to the beam body.
  • the object of the invention is to provide a method which can be carried out in a simple manner and with which a shaped wood beam of the type mentioned at the outset can be produced with increased bending and tensile strength.
  • this object is achieved in that the core is anchored to the beam body in the region of its ends essentially without a preload of the core or with a preload smaller than a preload desired for the application, and in that the moisture content of the beam body is then increased.
  • the core is preferably anchored to the beam body only in the region of its ends.
  • tension anchors for example in the form of end plates, or screw bolts extending transversely through the beam body and the core can be used.
  • the ends of the core in particular if this is a wooden component, can also be glued to the inner wall of the channel.
  • the core is expediently installed immediately after its strand formation, during which the moisture content is greatly reduced during curing. During subsequent storage in a normal climate, the moisture content increases, which leads to a considerable change in length (up to 11%). If the core is therefore installed immediately after the manufacturing process of the beam body, it is automatically prestressed by the subsequent swelling process. The degree of pre-tension can be regulated via the initial moisture content of the beam body.
  • the core which preferably extends essentially in one piece over the entire length of the beam, can consist of metal or plastic.
  • the core is arranged essentially loosely in the channel of the beam body. Conveniently it even has a certain play in the channel transversely to its longitudinal direction in order to be able to absorb moisture-dependent dimensional changes in the beam body (swelling or shrinking).
  • the cross section of the core can also be smaller than the cross section of the channel, and the space thus created between the core and the inner wall of the channel can be filled with a filler material.
  • the filling material can have elastic properties, for example be foamed, or it can produce a firm adhesive connection between the core and the inner channel wall.
  • the core can be made to end at a distance from the ends of the channel.
  • the regions of the channel that extend beyond the ends of the core in this way form pockets for receiving connecting pieces for connecting adjacent ends of two beam bodies.
  • This type of connection is particularly advantageous in wall panel construction, since the connecting piece which can be moved in the pockets can be used for fastening to struts or the like which run transversely to the beam and at the same time compensates for changes in length of the shaped wood beams when swelling or shrinking.
  • the channel and the core preferably have an elongated, in particular substantially rectangular cross-section, the longitudinal direction of which lies in the bending plane of the beam body determined by the application. This increases the bending strength of the shaped wood beam, in particular if the beam body contains a plurality of channels with cores arranged therein which are essentially parallel to one another with respect to their cross-sectional longitudinal directions.
  • the wall element shown in Fig. 1 is formed by a plurality of horizontally extending, one above the other shaped wooden beams 1, which are supported with connecting plates 3 on vertically extending supports 5, for example made of reinforced concrete.
  • Each of the shaped wood beams 1 has an elongated beam body 7, which is essentially rectangular in cross section and has a groove 9 running in the longitudinal direction of the beam on its underside and a rib 11 aligned with it on its top.
  • the ribs 11 engage in the grooves 9 of the beam bodies 7 lying above them.
  • Elastic sealing strips 13 inserted into the grooves 9 seal joints between the superimposed beam bodies 7.
  • the connection plates 3 are nailed or screwed onto the shaped wooden beams 1 and engage behind with a head 15 the edges of a vertically extending, for example dovetail-shaped groove 17 in the support 5.
  • the beam body 7 is extruded from wood particles, for example wood shavings or the like, which have been mixed with a binder, as described, for example, in DE-C-29 32 406.
  • the beam body 7 contains at least one, here two, longitudinally extending channels 19, which accelerate the hardening during the manufacturing process.
  • the channels 19 have an elongated, approximately rectangular cross-section and extend with their cross-sectional long side transversely to the plane of the wall formed by the shaped wooden beams 1.
  • the channels 19 are arranged one above the other in the wall plane and run parallel to one another, also with regard to their cross-sectional longitudinal direction.
  • each of the core rods 21 consists of laminated veneer lumber with a comparatively high number of veneer layers running along the channels 19 and parallel to their longitudinal cross-sectional direction, the wood fibers of which are indicated at 25 in FIG. 2 run approximately in the longitudinal direction of the beam body 7.
  • the game 23 allows the bar body 7 to shrink with changes in temperature and humidity, without internal stresses stressing the bar body to the point of bursting.
  • the game 23 is, however, only so great that initial bending loads on the beam body 7, for example due to a wind load or the like, lead to a play compensation and to an increased support of the beam body 7 on the core rods 21 even at a comparatively low load.
  • the shaped wooden beams 1 can also be realized from the shaped wooden beams 1.
  • the shaped wood beams can also be used as construction elements for supports, struts or the like.
  • the core rods 21 can also consist of a material other than laminated veneer lumber, for example of plastic or metal.
  • FIGS. 1 and 2 Variants of shaped wood beams are explained below. Components having the same effect are designated by the reference numerals of FIGS. 1 and 2 and provided with a letter to distinguish them. For explanation, reference is made to the above description, in particular FIGS. 1 and 2.
  • the shaped wood beam 1 a shown in FIG. 3 again contains core rods 21 a consisting of laminated veneer lumber in the channels 19 a of its beam body 7 a.
  • the spaces between the inner wall of the channel 19a and the core rod 21a arranged therein are essentially filled to the entire length of the beam body 7a by an at least limited elastic material 27.
  • the material 27, which can be an adhesive, connects the core rods 21a to the beam bodies 7a. This measure increases the bending strength of the shaped wood beam 1a.
  • FIG. 4 shows a shaped wood beam 1b, in which the core rod 21b arranged in the channel 19b is fixedly connected to the beam body 7b exclusively in the region of the ends of the core rod 21b (only one end is shown).
  • the core rod 21b runs loosely movable between the ends, preferably with a clearance 23b, in the channel 19b.
  • the ends of the core rod 21b are firmly connected to the bar body 7b by adhesive 27b, in such a way that the core rod 21b is installed under prestress.
  • an anchor bolt 29 penetrating both the bar body 7b and the end of the core rod 21b can also be provided for the attachment.
  • the preload can be introduced into the core rod 21b by means of suitable pulling devices acting on the core rod 21b during the installation.
  • the core rod 21b is preferably introduced by lengthening the bar body 7b by swelling due to moisture.
  • the wood portion is dried out very much, which causes the extrusion material to shrink.
  • the core rod 21b is inserted immediately after the extrusion process in the channel 19b and anchored at the end to the beam body 7b.
  • the beam body 7b swells, its length changing considerably and tensioning the core rod 21b.
  • Fig. 5 shows a variant of a wall element, which are also constructed with horizontally arranged shaped wooden beams 1c and are held on vertical supports 5c.
  • the shaped wood beams 1c can be one of the beams explained above, wherein each shaped wood beams 1c in turn contains core rods 21c arranged in channels 19c.
  • the core rods 21c end at a distance from the end of the beam body 7c.
  • the portion of the channel 19c remaining in the region of the end of the beam body 7c forms a pocket 31 for receiving a connecting piece 33 which is located opposite one another in the pockets 31 Beam body 7c engages.
  • the beam bodies 7c overlap the support 5c, but end at a distance from one another.
  • a fastening element for example a nail or a screw 35, holds the connecting element 33 between the ends of adjacent beam bodies 7c on the support 5c.
  • the depth of penetration of the connecting element 33 into the pockets 31 is less than their total depth. This dimensioning, in conjunction with the distance between opposite ends of adjacent beam bodies 7c, ensures that the beam bodies 7c can expand as a function of temperature and moisture.
  • the connecting piece 33 clamps the beam body 7c against the support 5c. However, its transverse dimensions are dimensioned so that expansion compensation is also possible here.
  • the passage hole for the screw 35 in the connecting element 33 is also designed as an elongated hole in order to ensure expansion compensation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (6)

  1. Procédé de fabrication d'une poutre en bois moulé, dont le corps de poutre (7b) formé par pressage, en particulier par extrusion, à partir de particules de bois et de liant contient dans sa direction longitudinale au moins un canal s'étendant sur toute la longueur de la poutre, canal dans lequel est inséré une âme (21b) constituée d'un matériau ayant une résistance à la flexion et à la traction supérieure à celle du corps de poutre (7b), caractérisé en ce que l'âme (21b) est ancrée au niveau de ses extrémités au corps de poutre (7b), pour l'essentiel sans précontrainte de l'âme (21b) ou avec une précontrainte plus faible qu'une précontrainte souhaitée pour l'application concernée, et en ce que la teneur en humidité du corps de poutre (7b) est alors augmentée.
  2. Procédé selon la revendication 1, caractérisé en ce que l'âme (21b) est insérée dans le corps de poutre (7b) et ancrée sur celui-ci pendant que la teneur en humidité du corps de poutre (7b) est maintenue à une valeur qui est inférieure à une valeur normale s'établissant dans le cas d'application, et en ce que la teneur en humidité du corps de poutre (7b) est augmentée jusqu'à la valeur normale.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on utilise une âme s'étendant d'un seul tenant sensiblement sur toute la longueur de la poutre.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que, pour l'âme (21), on utilise une barre en bois couché, en particulier en bois de placage.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'âme (21) est insérée dans le canal (19) avec du jeu transversalement à sa direction longitudinale.
  6. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la section transversale de l'âme (21a) est plus petite que la section transversale du canal (19a) et l'espace entre l'âme (21a) et la paroi intérieure du canal (19a) est remplie par un matériau de remplissage (27).
EP94100123A 1993-01-18 1994-01-05 Poutre en bois moulée et procédé pour sa fabrication Expired - Lifetime EP0607805B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4301153 1993-01-18
DE4301153A DE4301153C1 (de) 1993-01-18 1993-01-18 Formholzbalken und Verfahren zu seiner Herstellung

Publications (2)

Publication Number Publication Date
EP0607805A1 EP0607805A1 (fr) 1994-07-27
EP0607805B1 true EP0607805B1 (fr) 1997-04-23

Family

ID=6478396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94100123A Expired - Lifetime EP0607805B1 (fr) 1993-01-18 1994-01-05 Poutre en bois moulée et procédé pour sa fabrication

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EP (1) EP0607805B1 (fr)
AT (1) ATE152030T1 (fr)
DE (2) DE4301153C1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012215151A1 (de) * 2012-08-27 2014-02-27 Areva Gmbh Trägeranordnung sowie damit errichtete Konstruktion

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1147746B (de) * 1958-10-30 1963-04-25 Georges Masse Verfahren und Vorrichtung zur kontinuierlichen Herstellung einer mit Verstaerkungseinlagen armierten Spanholz-pressplatte fuer Behaelter
DE2932406C2 (de) * 1979-08-09 1983-06-23 Anton 8892 Kühbach Heggenstaller Verfahren und Vorrichtungen zum Strangpressen eines Gemenges auf pflanzlichen Kleinteilen und Bindemitteln
DE3150577C2 (de) * 1981-12-21 1983-12-29 Anton 8892 Kühbach Heggenstaller Vorrichtung zum Beschicken des Füllraumes einer horizontalen Kolben-Strangpresse mit einem Gemisch aus pflanzlichen Kleinteilen und Bindemittel zur Herstellung hohlprismatischer Strangpreßprofile
DE3321307C2 (de) * 1983-06-13 1986-06-19 Anton 8892 Kühbach Heggenstaller Verfahren zur Herstellung von Tragriegeln, Profilstäben, Balken u.dgl. aus gepreßten pflanzlichen Kleinteilen
DE3507640A1 (de) * 1985-03-05 1986-09-11 Hubert 5778 Meschede Möller Verfahren zur herstellung verstaerkter profilteile
DE3605066C1 (de) * 1986-02-18 1987-08-13 Hubert Moeller Hohlprofil aus einer Kunststoff-Fasermischung
DE8625692U1 (de) * 1986-09-26 1986-11-27 Anton Heggenstaller AG, 86556 Kühbach Tragendes, balkenförmiges Bauteil

Also Published As

Publication number Publication date
EP0607805A1 (fr) 1994-07-27
DE59402464D1 (de) 1997-05-28
DE4301153C1 (de) 1994-02-10
ATE152030T1 (de) 1997-05-15

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