EP0034820B1 - Poutre en treillis en bois collée et coffrage construit à l'aide de cette poutre - Google Patents

Poutre en treillis en bois collée et coffrage construit à l'aide de cette poutre Download PDF

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Publication number
EP0034820B1
EP0034820B1 EP81101224A EP81101224A EP0034820B1 EP 0034820 B1 EP0034820 B1 EP 0034820B1 EP 81101224 A EP81101224 A EP 81101224A EP 81101224 A EP81101224 A EP 81101224A EP 0034820 B1 EP0034820 B1 EP 0034820B1
Authority
EP
European Patent Office
Prior art keywords
truss
booms
cross
glued
posts
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
Application number
EP81101224A
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German (de)
English (en)
Other versions
EP0034820A2 (fr
EP0034820A3 (en
Inventor
Günter Knop
Norbert Peters
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.)
STREIF AG
Original Assignee
STREIF AG
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 STREIF AG filed Critical STREIF AG
Publication of EP0034820A2 publication Critical patent/EP0034820A2/fr
Publication of EP0034820A3 publication Critical patent/EP0034820A3/de
Application granted granted Critical
Publication of EP0034820B1 publication Critical patent/EP0034820B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48—Supporting structures for shutterings or frames for floors or roofs
    • E04G11/50—Girders, beams, or the like as supporting members for forms
    • 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
    • E04C3/16—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with apertured web, e.g. trusses

Definitions

  • the invention relates to a glued timber truss, which is particularly intended for formwork construction, and to a formwork formed using the same.
  • a carrier for construction purposes is known, the structure of which is outlined in the preamble of claim 1.
  • This carrier has a one-piece upper chord and a parallel one-piece lower chord.
  • the upper and lower chords are connected to each other via diagonal bars and vertical posts, which are embedded in several parallel layers in the upper and lower chords with a rectangular cross-section and are connected by gluing.
  • the shorter sides of the rectangular cross section from the upper and lower chord run parallel to the beam height.
  • the diagonal bars and the vertical posts converge at their ends to form nodes in the upper and lower chord.
  • the distance between knot points forms a compartment.
  • Triangular compartments are formed in connection with the rising and falling diagonal bars.
  • the stiffening of the longitudinal member formed by the diagonal bars rising and falling is interrupted by sections which are delimited by vertical posts and are free of diagonal bars.
  • the carrier In the area of these sections, the carrier can later be subdivided into individual carrier sections in such a way that end constructions are present at the ends of the carrier sections obtained in this way, forming the carrier end compartments in which the straps have an overhang.
  • the vertical posts of these sections are expediently connected to each other for stiffening by a web plate or the vertical posts are arranged close to one another.
  • the sections delimited by vertical posts and free of diagonal bars are only arranged in the longitudinal direction of the beam at those points at which later cutting to achieve a predetermined length of a beam section appears expedient, and these sections are less resilient in cross-section as a result of the interruption in the stiffening due to the absence of diagonal bars the other girder cross-sections if the vertical posts of these sections are not connected to one another by a web plate.
  • DE-A No. 2821907 describes a wooden girder construction in which the upper and lower chords are in two parts, so that the wooden girder construction has an open cross-section with three layers, the two outer layers consisting only of belts and the middle layer of diagonal bars is formed, the ends of which are glued together to form a knot with the two parts of the upper chord and lower chord using a plywood-based intermediate layer.
  • the longer cross-sectional side of the upper and lower flange with a rectangular cross-section is aligned parallel to the beam height.
  • the rule for truss structures is to push the bars into the knots without eccentricity. In this way, additional stresses in the bars are avoided. If the bars are knocked off center in the truss, misalignment moments occur which result in additional stress. Therefore, the goal, in order to construct economically, is to keep the eccentricity - if not avoidable - as small as possible.
  • the invention aims to provide a glued timber truss girder which, while overcoming the difficulties and disadvantages of the prior art, has a uniform and sufficient bending stiffness and in particular has a compact design, is easy to manufacture and is suitable for formwork construction with other parts, such as cross members , can be connected using simple connecting means.
  • the wooden truss has an open cross-section, which comprises at least three layers.
  • the filler rods in the invention are not brought together to form a node, but are at a predetermined distance from one another.
  • the outer layers in the elevation level consist of belts, which are preferably divided into two, and vertical posts, which are divided into four and have a relatively large eccentricity to the imaginary junction.
  • the middle i.e. The position between the vertical posts, on the other hand, is formed only by a diagonal bar, which is arranged off-center both to the intersection of the bar axis belt posts and to the imaginary node to be set. The diagonal bars do not touch each other, but leave a space free.
  • a diagonal bar is provided in each compartment, apart from possibly the end compartments, with a relatively large eccentricity in relation to the junction point that is intended to be applied, so that misalignment moments occur in the wooden truss beam according to the invention.
  • These offset moments are accepted in the invention because a number of advantages are achieved thereby. Because the straps have rectangular cross-sections, the longer cross-section being parallel to the beam height, the additional moments resulting from the offset are absorbed.
  • the glued timber truss girder according to the invention is designed in such a way that, particularly due to its resolved cross-section, fastening means can be attached to almost any point on the upper and lower chord without having to drill. Holes weaken the belt. This advantage is particularly noticeable when formwork is attached to the formwork (can be supported on the top chord), several girders are assembled (girder joints can easily be realized on the protruding girdle ends in the area of the end compartments), supports are to be attached and suspension scaffold structures are to be attached. As a result of the use of thin wooden cross sections, the production is generally less expensive.
  • a formwork in particular large slab formwork, is formed using the timber truss girder according to the invention in that the spaces formed by the post expansion can be used to connect the crossbeams used in the spaces using, for example, squared timber. It can be seen from this that stable large-panel formwork with a high load-bearing capacity, which have a low overall height, can be assembled with the timber truss girder according to the invention. This not only improves the stability of the large panel formwork, it also saves space on the work platform of a wall formwork.
  • the wooden truss has upper and lower chords 1 and 2 with a rectangular cross section.
  • the resolved cross section of the timber truss shown in FIG. 2 has three layers.
  • the outer layers consist of belts 1 and 2 and vertical posts 3.
  • the middle layer comprises only diagonal bars 4 arranged upwards and downwards between the belts 1 and 2 Posts 3 of two successive compartments r are at a distance a from one another, so that a square free space 5 is formed between the belts 1 and 2 by the expansion of the posts 3.
  • All vertical posts 3 of the wooden truss are parallel arranges and glued in the belts 1 and 2 galvanized.
  • other design forms of connections for the vertical posts 3 on the straps 1 and 2 are possible, for example using dowels.
  • the alternately rising and falling diagonal bars 4 do not meet at their ends, but are glued between the straps 1 and 2 in such a way that a free space 6 is formed in that the ends of the diagonal bars 4 are at a distance d from one another.
  • a free space 6 is formed in that the ends of the diagonal bars 4 are at a distance d from one another.
  • the length of the wooden truss is an integral multiple of the compartment r. Therefore, the wooden truss can be cut to smaller lengths if necessary.
  • the upper and lower chords 1 and 2 are designed in two parts (see Fig. 2) and each part has a rectangular cross section. This rectangular cross-section is arranged in the timber frame girder in such a way that the longer cross-sectional side h in FIG. 2 runs parallel to the girder height. As a result, the straps 1 and 2 have sufficient flexural rigidity.
  • the wooden truss is designed such that the straps 1 and 2 protrude at its ends, namely by half the distance a between adjacent posts 3 of two successive compartments r. These protrusions facilitate the formation of a beam joint.
  • fastening means 13, 14 can be attached to almost any point on the upper and lower chord, which are used for connecting a formwork, for fastening formwork supports, for struts, Hanging frame or the like are determined. These fasteners 13, 14 can be easily carried out and attached by spreading the layers of the belts 1 and 2.
  • the cross sections of the straps 1, 2 are rectangular, i.e. that the ratio of the cross-sectional sides h to b is greater than 1.
  • the diagonal bars 4 in the embodiment shown in FIG. 2 have the same width b as the belts 1 and 2 and the posts 3. If the resolved cross-section of the timber frame girder comprises more than three layers, the diagonal bars 4 are expediently wider than the belts 1 and 2. If, for example, crosswise arranged diagonal bars are provided, which is not shown in the drawing, a smaller width for the diagonal bars is also possible.
  • FIG. 5 shows, for example, a large panel formwork element which has a plurality of wooden truss girders as primary elements in accordance with the design according to FIG. 1.
  • the same or similar parts as in Figs. 3 and 4 are given the same reference numerals in Fig. 5.
  • parallel squared timbers 7 and cross-distributing cross members 8 are shown.
  • the crossbeams 8 extend through the free spaces 5 (FIG. 1) of the timber frame girder and in this way a stable flat girder with a reinforced top chord is formed for large-area formwork.
  • the large-area formwork formed in this way has a low weight and a low static usable height, because the linings 11 are used to introduce the loads into the upper chords 1. Regardless of the use of large-area formwork as vertical wall formwork or horizontal ceiling formwork, such a compact construction with such a small height brings surprising advantages with large-panel formwork.
  • FIG. 6 shows an enlarged view of one end of a timber truss girder from FIG. 1. From this it can be seen that the upper and lower chords 1 and 2 protrude% a above the last vertical post 3. Also shown in Fig. 6 in broken line is a going through the belt 1 and glued into the post 3 round rod 12 through which the daytime forces are introduced into the post 3. Since the pressures that can be absorbed by the belts 1, 2 are only small across the fiber, round rods are expediently glued in, so that the bearing surface is kept small. High support forces can also be absorbed by gluing a pane of plywood, chipboard and / or metal plates in place of the diagonal bar 4 in the support area of the wooden truss girder. Of course, combinations of glued-in round bars 12 and designs of the diagonal bar 4 in the support area as a disk are also possible, wherein the vertical posts 3 can also be provided twice in this support area.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Claims (7)

1. Poutre en treillis en bois collée, en particulier pour construire des coffrages, comportant des membrures parallèles (1, 2), des montants verticaux (3) et des barres diagonales (4), de section rectangulaire, qui comprend dans le sens de la longueur plusieurs treillis (r), représentant la distance entre les noeuds du treillis, et dont les membrures présentent une saillie dans les panneaux terminaux, des sections délimitées par des montants verticaux respectifs et dépourvues de barres diagonales étant présentes à des endroits déterminés dans la direction longitudinale de la poutre, caractérisée en ce que la section décomposée de la poutre en treillis en bois comprend au moins trois couches, les deux couches extérieures comprenant des membrures (1, 2) et les montants verticaux (3) de la section décomposée avec un écartement (a), c'est-à-dire avec une distance entre montants verticaux (3) voisins de deux treillis (r) successifs, les noeuds du treillis devant être, en regardant chaque fois dans la direction longitudinale de la poutre, géométriquement au centre de l'écartement (a) dans la membrure supérieure (1 ) ou la membrure inférieure (2), en ce qu'en outre dans tous les treillis (5), éventuellement à l'exception des treillis terminaux, la couche centrale entre montants verticaux (3) n'est formée que de barres diagonales (4) qui sont collées à plat dans la zone des membrures (1,2) entre les parties de membrure et présentent une distance mutuelle (d) inférieure à l'écartement (a), en ce que les grands côtés (h) de la section rectangulaire des membrures (1, 2) sont parallèles à la hauteur de la poutre, en ce que chaque treillis (r) ne comprend, en coupe longitudinale, éventuellement à l'exception des treillis terminaux, qu'une barre diagonale (4), et en ce que les treillis (r) sont tous réalisés à une même longueur.
2. Poutre en treillis en bois selon la revendication 1, caractérisée en ce que sa section décomposée comprend cinq couches, dont trois couches constituées par des membrures et les montants verticaux entre lesquelles est placé chaque fois une couche formée uniquement par des barres diagonales (4).
3. Poutre en treillis en bois selon la revendication 1, caractérisée en ce que les membrures (1,2), les montants (3) et les barres diagonales (4) ont. des sections identiques.
4. Poutre en treillis en bois selon l'une des revendications 1 à 3, caractérisée en ce que les barres diagonales (4) des treillis terminaux sont conformées en rondelles présentant une structure à plusieurs couches comprenant des panneaux de stratifié, d'aggloméré et/ou de métal.
5. Poutre en treillis en bois selon l'une des revendications 1 à 4, caractérisée en ce que les montants (3) sont reliés aux membrures (1, 2) par collage avec assemblage en queue d'aronde et/ou au moyen de barres rondes (12) encollées, en bois dur, en acier pour barre ronde, ou en une matière analogue, qui traversent la membrure (1, 2) et pénètrent dans le bois frontal du montant (3) en affleurant avec la surface, ou en ce que les montants (3) sont reliés aux membrures (1,2) par des vis cylindriques autotaraudeuses encollées.
6. Coffrageforméàl'aided'unepoutreentreillis selon l'une des revendications précédentes, caractérisé en ce que plusieurs poutres en treillis sont disposées en parallèle, et la membrure supérieure est renforcée par une plaque, et en ce que des traverses (8) passent par les espacements (5) formés par l'écartement (a).
7. Coffrage selon la revendication 6, caractérisé en ce qu'il comporte un bois de chant (7) placé sur les traverses (8) à la place d'une poutre en treillis sur deux et d'une poutre en treillis sur trois disposées parallèlement.
EP81101224A 1980-02-21 1981-02-20 Poutre en treillis en bois collée et coffrage construit à l'aide de cette poutre Expired EP0034820B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3006404 1980-02-21
DE19803006404 DE3006404A1 (de) 1980-02-21 1980-02-21 Geleimter holzfachwerk-schalungstraeger

Publications (3)

Publication Number Publication Date
EP0034820A2 EP0034820A2 (fr) 1981-09-02
EP0034820A3 EP0034820A3 (en) 1981-10-07
EP0034820B1 true EP0034820B1 (fr) 1984-05-09

Family

ID=6095130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101224A Expired EP0034820B1 (fr) 1980-02-21 1981-02-20 Poutre en treillis en bois collée et coffrage construit à l'aide de cette poutre

Country Status (2)

Country Link
EP (1) EP0034820B1 (fr)
DE (2) DE3006404A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2527065A (en) * 2014-06-10 2015-12-16 Hl Plastics Ltd Improvements in or relating to door and window assemblies

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2576346A1 (fr) * 1985-01-18 1986-07-25 Gay Pierre Dispositif de supportage et de stabilisation des combles par une structure en bois massif
FR2786796B1 (fr) * 1998-12-03 2001-01-26 Jean Luc Sandoz Systemes structurels triangules en bois, tels que charpentes , ponts, planchers
AU2012203009A1 (en) * 2011-06-03 2012-12-20 Australian Engineered Solutions Pty Ltd Composite Timber Components

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1372078A (en) * 1919-09-18 1921-03-22 John C Mckeown Lattice-truss
FR1224534A (fr) * 1959-05-15 1960-06-24 éléments d'assemblage, bois et métal, à usages multiples
DE1969269U (de) * 1967-06-19 1967-09-28 Eugen Endele Profiltraeger aus vollholz.
DE2318720A1 (de) * 1973-04-13 1974-10-17 Omega Gerueste & Baugeraete Traeger nach art eines vierendeeltraegers
DE2507755A1 (de) * 1975-02-22 1976-08-26 Karl Ditsch Spartraeger aus holz
US4177968A (en) * 1977-08-29 1979-12-11 Acrow (Engineers) Limited Concrete formwork soldier
DE2821907A1 (de) * 1978-05-19 1979-11-22 Pentti Teodor Purontakanen Holztraegerkonstruktion mit adhaesivverbindungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2527065A (en) * 2014-06-10 2015-12-16 Hl Plastics Ltd Improvements in or relating to door and window assemblies

Also Published As

Publication number Publication date
DE3006404A1 (de) 1981-08-27
EP0034820A2 (fr) 1981-09-02
DE3163449D1 (en) 1984-06-14
EP0034820A3 (en) 1981-10-07

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