EP0255110A2 - Wooden supporting member for forms - Google Patents

Wooden supporting member for forms Download PDF

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Publication number
EP0255110A2
EP0255110A2 EP87110922A EP87110922A EP0255110A2 EP 0255110 A2 EP0255110 A2 EP 0255110A2 EP 87110922 A EP87110922 A EP 87110922A EP 87110922 A EP87110922 A EP 87110922A EP 0255110 A2 EP0255110 A2 EP 0255110A2
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EP
European Patent Office
Prior art keywords
formwork
reinforcing elements
bolt
rod
support according
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.)
Granted
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EP87110922A
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German (de)
French (fr)
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EP0255110A3 (en
EP0255110B1 (en
Inventor
Josef Umdasch
Ernst Röck
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Oesterreichische Doka Schalungstechnik Gesellschaf
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OSTERREICHISCHE DOKA SCHALUNGS- und GERUSTUNGSTECHNIK GmbH
OESTERR DOKA SCHALUNG
Osterreichische DOKA Schalungstechnik GmbH
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Application filed by OSTERREICHISCHE DOKA SCHALUNGS- und GERUSTUNGSTECHNIK GmbH, OESTERR DOKA SCHALUNG, Osterreichische DOKA Schalungstechnik GmbH filed Critical OSTERREICHISCHE DOKA SCHALUNGS- und GERUSTUNGSTECHNIK GmbH
Priority to AT87110922T priority Critical patent/ATE57415T1/en
Publication of EP0255110A2 publication Critical patent/EP0255110A2/en
Publication of EP0255110A3 publication Critical patent/EP0255110A3/en
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Publication of EP0255110B1 publication Critical patent/EP0255110B1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • 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

Definitions

  • the invention relates to a formwork beam made of wood with an upper and a lower flange and a solid wall or lattice web connecting them, which is connected to the belts by several tines engaging in them for gluing, the upper and lower flange each consisting of an unglued wooden beam exist, the ends of which are each provided with a protective arrangement.
  • formwork girders are not only exposed to the weather, but also to some extent to considerable mechanical loads (to a great extent impact or impact loads).
  • the ends of the straps which experience has shown to tear in the unprotected state, are particularly at risk, which affects the dimensional stability of the formwork girders.
  • formwork beams in the area of the belt ends are equipped with protective arrangements.
  • Protective arrangements of this type are formed, for example, in the form of corrugated sheets which are hammered into the end grain of the straps (cf. for example CH-PS 52 213).
  • a very effective protective arrangement is also provided by steel caps spanning the entire end face of the carrier (cf. for example brochure "Peri program overview”) or plastic caps (cf. brochure "Steidle overall program", page 1, point 2).
  • the object of the present invention is to develop a formwork girder of the type described at the outset in such a way that, on the one hand, the disadvantages of the corrugated sheet or cap arrangements are avoided and, on the other hand, the effort required for the formation of the protective arrangements is reduced.
  • the protective arrangement consists of at least one rod-like or bolt-like reinforcing element which passes through the ends of the straps perpendicular to the plane of the web.
  • the term "ends of the straps" does not only encompass the belt region directly adjoining the end face, but rather the entire end section or part of each belt.
  • the features according to the invention create a completely new type of protective arrangement with which tearing or splitting, in particular unglued belts, can be counteracted with surprisingly good results with little technical effort.
  • This protection arrangement results in a long service life despite the hard construction work.
  • the protective arrangement comprises two rod-like or bolt-like reinforcing elements at each end of the belt.
  • the protective arrangement comprises two rod-like or bolt-like reinforcing elements at each end of the belt.
  • rod-like or bolt-like reinforcing elements are provided at each end of the belt, these can be arranged either centrally and - seen in the longitudinal direction of the belt - side by side or off-center and - seen in the longitudinal direction of the belt - offset from one another.
  • the reinforcing elements are designed in the form of dowels.
  • the cross-section of the dowels is round. If necessary, however, dowels with a square, rectangular, square or slot-like cross section can also be used.
  • the reinforcing elements In order to prevent changes in the wood of the belts from swelling or shrinking impairing the holding force of the reinforcing elements, in particular the dowels, it is advantageous to anchor the reinforcing elements in the belts in a form-fitting manner.
  • a particularly advantageous form-fitting anchoring results if the reinforcing elements are equipped with form-fitting anchoring elements in the region of their ends.
  • Such anchoring elements are expediently designed as a widening or head. In the case of a head-like Design, it is advantageous to use a countersunk, cylinder, lens head or the like. to provide.
  • plastic proves to be particularly suitable and advantageous as a material for the rod-like or bolt-like reinforcing elements, in particular if they are designed as dowels with a round cross section. Due to the elasticity of the plastic, the anchoring elements can participate in the swelling and shrinking processes of the wood to a limited extent, which provides a particularly effective precaution against tearing the belt ends.
  • the rod-like or bolt-like anchoring elements can either be prefabricated or produced by pouring them into drill holes already provided in the belt. In the case of production by pouring, particularly good reinforcement results are achieved, since the reinforcing elements anchor themselves automatically in the unevenness of the borehole.
  • rod-like or bolt-like reinforcement elements made of plastic is that shocks, as they are unavoidable in rough construction site operations, can be absorbed in a particularly advantageous manner, since the elasticity of the plastic interacts well with the elasticity of the wood. It is also advantageous that the design of the widenings or the shape of the head can be chosen freely in the case of the use of plastic and can thus be specially adapted to the particular circumstances.
  • Rod-like or bolt-like reinforcing elements in particular in the form of dowels, can not only consist of plastic, but also of metal, wood or composite materials. Furthermore, the rod-like or bolt-like reinforcement elements can be one or two pieces. If plastic is used, the head can be prefabricated at one end of the rod-like or bolt-like reinforcement elements and the head can be formed at the other end after being inserted into the borehole by the action of heat or ultrasound. In addition, it is possible to weld or press together rod-like or bolt-like reinforcing elements consisting of two pieces after being arranged in the region of the belt ends. However, such a connection can also be made by gluing, screwing or by any other type of closure.
  • the reinforcing elements are each in the form of hollow rivets.
  • These hollow rivets are preferably made of aluminum.
  • the upper flange 1 and the lower flange 2 are connected to the solid wall web 3 by means of several prongs 4 of the web engaging in the belts by gluing.
  • the upper and lower chords 1, 2 each consist of an unglued wooden beam, while the web 3 is constructed from three layers of wood glued together.
  • both the upper chord 1 and the lower chord 2 are sharply chamfered towards both the side surfaces and the top and bottom.
  • rod-like or bolt-like reinforcing elements 5 are inserted into the ends of the belts 1 and 2 (see FIG. 2).
  • these rod-like or bolt-like reinforcement elements 5 are each in the form of a hollow rivet, each of which sits with its shank in a bore 7, which is arranged centrally in the belt end perpendicular to the central longitudinal plane of the web 3.
  • the bore 7 is each provided with a conical depression 8 in the region of its mouth edges, as can be seen in particular from FIG. 2.
  • the shaft of the hollow rivet 5 is in turn provided in the region of the ends with anchoring elements 6 which are positively located in the depressions 8 in the bore 7 and which are formed by conically widened regions of the shaft. These conically widened areas form a type of countersunk head on both ends of the shaft of the hollow rivet 5.
  • This configuration creates a tension force in the straps that counteracts cracking.
  • a completely new protective arrangement is created in this way, with which the tearing of the wood can be counteracted with surprisingly good results with little technical effort.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Tires In General (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Scissors And Nippers (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Abstract

1. Wooden formwork beam with upper and lower chords (1, 2) and a solid-panel or latticework web (3) connecting them, which is connected to the chords (1, 2) by several tongues (4) engaging in them for glueing, wherein the upper and lower chords (1, 2) each consist of a wooden beam, the ends of which are in each case provided with a protective arrangement, characterised in that the protective arrangement consists of at least one rodlike or boltlike reinforcing element (5) which passes through the ends of the chords (1, 2) perpendicularly to the plane of the web (3).

Description

Die Erfindung betrifft einen Schalungsträger aus Holz mit einem Ober- und einem Untergurt und einem diese verbindenden Vollwand- oder Gittersteg, der mit den Gurten über mehrere in diese eingreifende Zinken zum Verleimen verbunden ist, wobei der Ober- und der Untergurt aus je einem unverleimten Holzbalken bestehen, dessen Enden jeweils mit einer Schutzanordnung versehen sind.The invention relates to a formwork beam made of wood with an upper and a lower flange and a solid wall or lattice web connecting them, which is connected to the belts by several tines engaging in them for gluing, the upper and lower flange each consisting of an unglued wooden beam exist, the ends of which are each provided with a protective arrangement.

Im rauhen Baustellenbetrieb sind Schalungsträger nicht nur der Witterung, sondern auch zum Teil erheblichen mechanischen Belastungen (in starkem Maße stoß- oder Schlagbeanspruchungen) ausgesetzt. Besonders gefährdet sind dabei die Enden der Gurte, welche im ungeschützten Zustand erfahrungsgemäß zum Einreißen neigen, wodurch die Maßhaltigkeit der Schalungsträger beeinflußt wird. Um dieses Einreißen zu vermeiden, werden Schalungsträger im Bereich der Gurtenden mit Schutzanordnungen ausgestattet.In rough construction site operation, formwork girders are not only exposed to the weather, but also to some extent to considerable mechanical loads (to a great extent impact or impact loads). The ends of the straps, which experience has shown to tear in the unprotected state, are particularly at risk, which affects the dimensional stability of the formwork girders. In order to avoid this tearing, formwork beams in the area of the belt ends are equipped with protective arrangements.

Derartige Schutzanordnungen werden beispielsweise in Form von Wellenblechen ausgebildet, die in das Stirnholz der Gurte eingeschlagen werden (vgl. beispielsweise CH-PS 52 213). Eine sehr wirksame Schutzanordnung stellen auch die gesamte Trägerstirnfläche überspannende Stahlkappen (vgl. beispielsweise Prospekt "Peri-Programmübersicht") oder Kunststoffkappen (vgl. Prospekt "Steidle-Gesamtprogramm", Seite 1, Punkt 2) dar.Protective arrangements of this type are formed, for example, in the form of corrugated sheets which are hammered into the end grain of the straps (cf. for example CH-PS 52 213). A very effective protective arrangement is also provided by steel caps spanning the entire end face of the carrier (cf. for example brochure "Peri program overview") or plastic caps (cf. brochure "Steidle overall program", page 1, point 2).

Bewährt haben sich auch Schutzanordnungen, welche aus einer die Stirnfläche der Gurte jeweils lediglich in ihrem mittleren Bereich überdeckenden Stahlkappe bestehen; und die sich an die Stahlkappe anschließenden, unüberdeckten Bereiche der Gurtenden sind dabei abgeschrägt (vgl. Prospekt PERI, Gitterträger T 7O V).Protective arrangements, which consist of a steel cap which only covers the end face of the belts in each case only in its central region, have also proven successful; and the uncovered areas of the belt ends adjoining the steel cap are chamfered (see brochure PERI, lattice girder T 7O V).

Bei den beschriebenen Schutzanordnungen besteht jedoch das Problem, daß sich die Wellenbleche bzw. die Kappen durch Schlagbeanspruchung oder stärkere Belastung, durch Quellen bzw. Schwinden des Holzes o.dgl. Einflüsse lockern und lösen können, wodurch in der Folge die Gefahr besteht, daß sie beim weiteren Einsatz der Träger verloren gehen und deshalb keine Schutzwirkung mehr gegeben ist. Da sie den äußeren Kräften zudem direkt ausgesetzt sind, treten bei Schlagbeanspruchungen häufig auch Deformationen oder Beschädigungen auf. Beschädigte oder abstehende Kappen aus Metall stellen jedoch erfahrungsgemäß eine erhebliche Verletzungsgefahr für die Arbeiter dar.In the protective arrangements described, however, there is the problem that the corrugated sheets or the caps or the like due to impact stress or greater stress, swelling or shrinking of the wood. Can loosen and loosen influences, which consequently runs the risk that they will be lost when the carrier is used further and therefore there is no longer any protective effect. As they are also directly exposed to the external forces, deformation or damage often occurs in the event of impact loads. Experience has shown that damaged or protruding metal caps pose a considerable risk of injury to workers.

Es ist auch bereits bekannt, die Enden der Gurte durch an das Vollholz angeschlossene separate Abschnitte zu armieren, die aus mehreren miteinander verleimten, sich kreuzenden Holzschichten bestehen (vgl. beispielsweise DE-OS 34 32 654). Von Vorteil ist bei derartigen Schutzanordnungen, daß kein zusätzlicher Montageaufwand für spezielle Teile der Schutzanordnung, wie Wellenblechen, Kappen oder dergleichen erforderlich ist, da die Armierungsmaßnahmen für die Trägerenden voll in den Herstellungsprozeß des Holzträgers mit eingebunden werden können, d.h. ausschließlich Holz und kein "artfremdes" Material verarbeitet werden muß. Für diese Einbindung in den Herstellungsprozeß ist jedoch ebenso ein gewisser zusätzlicher Aufwand erforderlich, der sich auf die Herstellungskosten auswirkt.It is also already known to reinforce the ends of the belts by separate sections connected to the solid wood, which consist of several glued, intersecting layers of wood (see, for example, DE-OS 34 32 654). It is advantageous in such protective arrangements that no additional assembly work for special parts of the protective arrangement, such as wave plates, caps or The same is necessary because the reinforcement measures for the beam ends can be fully integrated into the manufacturing process of the wood beam, ie only wood and no "foreign" material has to be processed. For this integration in the manufacturing process, however, a certain additional effort is also required, which affects the manufacturing costs.

Aufgabe der vorliegenden Erfindung ist es, einen Schalungsträger der eingangs beschriebenen Art derart weiterzubilden, daß zum einen die Nachteile der Wellenblech- oder Kappenanordnungen vermieden werden und zum anderen der für die Ausbildung der Schutzanordnungen erforderliche Aufwand reduziert wird.The object of the present invention is to develop a formwork girder of the type described at the outset in such a way that, on the one hand, the disadvantages of the corrugated sheet or cap arrangements are avoided and, on the other hand, the effort required for the formation of the protective arrangements is reduced.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Schutzanordnung aus mindestens einem stab- ­oder bolzenartigen Verstärkungselement besteht, das die Enden der Gurte senkrecht zur Ebene des Steges durchsetzt. Der Begriff "Enden der Gurte" umfaßt dabei nicht allein den unmittelbar an die Stirnfläche anschließenden Gurtbereich, sondern den gesamten endseitigen Abschnitt bzw. Teil jedes Gurtes.This object is achieved in that the protective arrangement consists of at least one rod-like or bolt-like reinforcing element which passes through the ends of the straps perpendicular to the plane of the web. The term "ends of the straps" does not only encompass the belt region directly adjoining the end face, but rather the entire end section or part of each belt.

Durch die erfindungsgemäßen Merkmale ist eine vollkommen neuartige Schutzanordnung geschaffen, mit der mit geringem technischem Aufwand einem Einreißen bzw. Spalten, insbesondere unverleimter Gurte mit überraschend guten Ergebnissen entgegengewirkt wird. Dabei ergibt diese Schutzanordnung eine lange Standzeit trotz des harten Baubetriebs.The features according to the invention create a completely new type of protective arrangement with which tearing or splitting, in particular unglued belts, can be counteracted with surprisingly good results with little technical effort. This protection arrangement results in a long service life despite the hard construction work.

Weiterverbesserte Ergebnisse werden erzielt, wenn die Schutzanordnung an jedem Gurtende zwei stab- oder bolzenartige Verstärkungselemente umfaßt. Für spezielle Fälle kann es jedoch auch zweckmäßig sein, drei oder mehrere stab- oder bolzenartige Verstärkungselemente pro Gurtende vorzusehen.Further improved results are achieved if the protective arrangement comprises two rod-like or bolt-like reinforcing elements at each end of the belt. For special cases, however, it can also be expedient to provide three or more rod-like or bolt-like reinforcing elements per belt end.

Für den Fall, daß zwei oder mehrere stab- oder bolzenartige Verstärkungselemente je Gurtende vorgesehen sind, können diese entweder mittig und - ­in Gurtlängsrichtung gesehen - nebeneinander oder außermittig und - in Gurtlängsrichtung gesehen - ­gegeneinander versetzt angeordnet werden.In the event that two or more rod-like or bolt-like reinforcing elements are provided at each end of the belt, these can be arranged either centrally and - seen in the longitudinal direction of the belt - side by side or off-center and - seen in the longitudinal direction of the belt - offset from one another.

Besonders vorteilhafte Ergebnisse werden erzielt, wenn die Verstärkungselemente in Form von Dübeln ausgebildet sind. Für die Fertigung ist es zweckmäßig, wenn der Querschnitt der Dübel rund ist. Im Bedarfsfalle können jedoch auch Dübel mit quadratischem, rechteckigen, viereckigem oder langlochartigen Querschnitt eingesetzt werden.Particularly advantageous results are achieved if the reinforcing elements are designed in the form of dowels. For production, it is useful if the cross-section of the dowels is round. If necessary, however, dowels with a square, rectangular, square or slot-like cross section can also be used.

Um zu verhindern, daß Veränderungen im Holz der Gurte durch Quellen bzw. Schwinden die Haltekraft der Verstärkungselemente, insbesondere der Dübel beeinträchtigen, ist es vorteilhaft, die Verstärkungselemente in den Gurten formschlüssig zu verankern. Eine besonders vorteilhafte formschlüssige Verankerung ergibt sich, wenn die Verstärkungselemente im Bereich ihrer Enden mit formschlüssigen Verankerungselementen ausgestattet sind. Derartige Verankerungselemente sind zweckmäßigerweise als Verbreiterung oder Kopf ausgestaltet. Im Falle einer kopfartigen Ausgestaltung ist es vorteilhaft, einen Senk-, Zylinder-, Linsenkopf o.dgl. vorzusehen.In order to prevent changes in the wood of the belts from swelling or shrinking impairing the holding force of the reinforcing elements, in particular the dowels, it is advantageous to anchor the reinforcing elements in the belts in a form-fitting manner. A particularly advantageous form-fitting anchoring results if the reinforcing elements are equipped with form-fitting anchoring elements in the region of their ends. Such anchoring elements are expediently designed as a widening or head. In the case of a head-like Design, it is advantageous to use a countersunk, cylinder, lens head or the like. to provide.

Versuche haben ergeben, daß sich als Werkstoff für die stab- oder bolzenartigen Verstärkungselemente, insbesondere dann, wenn sie als Dübel mit rundem Querschnitt ausgebildet sind, Kunststoff als besonders geeignet und vorteilhaft erweist. Aufgrund der Elastizität des Kunststoffes können die Verankerungselemente im beschränkten Umfang Quell- ­und Schwindvorgänge des Holzes mitmachen, wodurch eine besonders wirksame Vorsorge gegenüber einem Einreißen der Gurtenden getroffen ist. Im Falle des Einsatzes von Kunststoff können die stab- oder bolzenartigen Verankerugselemente entweder vorgefertigt sein oder durch Eingießen in bereits im Gurt vorgesehene Bohrlöcher hergestellt werden. Im Falle der Herstellung durch Eingießen werden besonders gute Armierungsergebnisse erzielt, da sich die Verstärkungselemente in den Unebenheiten des Bohrloches selbsttätig verankern.Tests have shown that plastic proves to be particularly suitable and advantageous as a material for the rod-like or bolt-like reinforcing elements, in particular if they are designed as dowels with a round cross section. Due to the elasticity of the plastic, the anchoring elements can participate in the swelling and shrinking processes of the wood to a limited extent, which provides a particularly effective precaution against tearing the belt ends. In the case of the use of plastic, the rod-like or bolt-like anchoring elements can either be prefabricated or produced by pouring them into drill holes already provided in the belt. In the case of production by pouring, particularly good reinforcement results are achieved, since the reinforcing elements anchor themselves automatically in the unevenness of the borehole.

Ein weiterer Vorteil von stab- oder bolzenartigen Verstärkungselementen aus Kunststoff besteht darin, daß Stöße, wie sie im rauhen Baustellenbetrieb unvermeidbar sind, in besonders vorteilhafter Weise aufgefangen werden können, da die Elastizität des Kunststoffes mit der Elastizität des Holzes gut zusammenwirkt. Von Vorteil ist ferner, daß die Ausbildung der Verbreiterungen bzw. der Kopfform im Falle des Einsatzes von Kunststoff frei gewählt werden und damit an die jeweiligen Gegebenheiten speziell angepaßt werden kann.Another advantage of rod-like or bolt-like reinforcement elements made of plastic is that shocks, as they are unavoidable in rough construction site operations, can be absorbed in a particularly advantageous manner, since the elasticity of the plastic interacts well with the elasticity of the wood. It is also advantageous that the design of the widenings or the shape of the head can be chosen freely in the case of the use of plastic and can thus be specially adapted to the particular circumstances.

Stab- oder bolzenartige Verstärkungselemente, insbesondere in Form von Dübeln, können jedoch nicht nur aus Kunststoff, sondern auch aus Metall, Holz oder aus Verbundmaterialien bestehen. Ferner können die stab- oder bolzenartigen Verstärkungselemente ein- oder zweistückig sein. Im Falle der Verwendung von Kunststoff kann der Kopf am einen Ende der stab- ­oder bolzenartigen Verstärkungselemente vorgefertigt und der Kopf am anderen Ende nach dem Einsetzen in das Bohrloch durch Wärmeeinwirkung oder Ultraschall gebildet werden. Darüber hinaus ist es möglich, aus zwei Stücken bestehende stab- oder bolzenartige Verstärkungselemente nach dem Anordnen im Bereich der Gurtenden miteinander zu verschweißen oder zu verpressen. Eine derartige Verbindung kann jedoch auch durch Verleimen, Verschrauben oder durch jede andere Verschlußart hergestellt werden.Rod-like or bolt-like reinforcing elements, in particular in the form of dowels, can not only consist of plastic, but also of metal, wood or composite materials. Furthermore, the rod-like or bolt-like reinforcement elements can be one or two pieces. If plastic is used, the head can be prefabricated at one end of the rod-like or bolt-like reinforcement elements and the head can be formed at the other end after being inserted into the borehole by the action of heat or ultrasound. In addition, it is possible to weld or press together rod-like or bolt-like reinforcing elements consisting of two pieces after being arranged in the region of the belt ends. However, such a connection can also be made by gluing, screwing or by any other type of closure.

Bei einem bevorzugten Ausführungsbeispiel der Erfindung sind die Verstärkungselemente jeweils in Form von Hohlnieten ausgebildet. Diese Hohlnieten bestehen vorzugsweise aus Aluminium.In a preferred embodiment of the invention, the reinforcing elements are each in the form of hollow rivets. These hollow rivets are preferably made of aluminum.

Im folgenden wird zur weiteren Erläuterung und zum besseren Verständnis ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben.

  • Fig. 1 zeigt in einer perspektivischen Ansicht ein Stirnende eines aus Obergurt-, Vollwandsteg und Untergurt bestehenden Schalungsträgers, und
  • Fig. 2 zeigt einen Querschnitt durch den Obergurt und einen Teil des Vollwandsteges in der Ebene II-II der Fig. 1.
In the following an embodiment of the invention will be described with reference to the accompanying drawings for further explanation and for better understanding.
  • Fig. 1 shows a perspective view of an end face of a formwork girder consisting of top flange, solid wall web and bottom flange, and
  • FIG. 2 shows a cross section through the upper chord and part of the solid wall web in the plane II-II of FIG. 1.

Bei dem in den Fig. 1 und 2 dargestellten Schalungsträger sind der Obergurt 1 und der Untergurt 2 mit dem Vollwandsteg 3 über mehrere in die Gurte eingreifende Zinken 4 des Stegs durch Verleimen verbunden. Der Ober- und der Untergurt 1, 2 bestehen dabei jeweils aus einem unverleimten Holzbalken, während der Steg 3 aus drei miteinander verleimten Holzschichten aufgebaut ist.1 and 2, the upper flange 1 and the lower flange 2 are connected to the solid wall web 3 by means of several prongs 4 of the web engaging in the belts by gluing. The upper and lower chords 1, 2 each consist of an unglued wooden beam, while the web 3 is constructed from three layers of wood glued together.

Bei dem dargestellten Ausführungsbeispiel sind die Enden sowohl des Obergurtes 1 als auch des Untergurtes 2 sowohl zu den Seitenflächen als auch zur Ober- bzw. Unterseite hin stark abgeschrägt.In the illustrated embodiment, the ends of both the upper chord 1 and the lower chord 2 are sharply chamfered towards both the side surfaces and the top and bottom.

In unmittelbarer Nähe dieser Abschrägungen sind in die Enden der Gurte 1 und 2 jeweils stab- oder bolzenartige Verstärkungselemente 5 eingesetzt (vgl. Fig. 2). Diese stab- oder bolzenartigen Verstärkungselemente 5 sind im vorliegenden Ausführungsbeispiel jeweils in Form einer Hohlniet ausgebildet, welche jeweils mit ihrem Schaft in einer Bohrung 7 sitzt, die senkrecht zur Mittenlängsebene des Steges 3 jeweils mittig im Gurtende angeordnet ist. Die Bohrung 7 ist im Bereich ihrer Mündungsränder jeweils mit einer kegelförmigen Einsenkung 8 versehen, wie dies insbesondere aus Fig. 2 ersichtlich ist. Der Schaft der Hohlniet 5 wiederum ist im Bereich der Enden mit formschlüssig in den Einsenkungen 8 der Bohrung 7 liegenden Verankerungselementen 6 ausgestattet, welche von kegelig aufgeweiteten Bereichen des Schaftes gebildet sind. Durch diese kegelig aufgeweiteten Bereiche wird eine Art Senkkopf an beiden Enden des Schaftes der Hohlniet 5 gebildet.In the immediate vicinity of these bevels, rod-like or bolt-like reinforcing elements 5 are inserted into the ends of the belts 1 and 2 (see FIG. 2). In the present exemplary embodiment, these rod-like or bolt-like reinforcement elements 5 are each in the form of a hollow rivet, each of which sits with its shank in a bore 7, which is arranged centrally in the belt end perpendicular to the central longitudinal plane of the web 3. The bore 7 is each provided with a conical depression 8 in the region of its mouth edges, as can be seen in particular from FIG. 2. The shaft of the hollow rivet 5 is in turn provided in the region of the ends with anchoring elements 6 which are positively located in the depressions 8 in the bore 7 and which are formed by conically widened regions of the shaft. These conically widened areas form a type of countersunk head on both ends of the shaft of the hollow rivet 5.

Durch diese Ausgestaltung wird eine Spannkraft in den Gurten ausgebildet, die einer Rißbildung entgegenwirkt. In Kombination mit den abgeschrägten Kanten der Gurte im Bereich der Stirnflächen wird auf diese Weise eine vollkommen neuartige Schutzanordnung geschaffen, mit der mit geringem technischen Aufwand einem Einreißen des Holzes mit überraschend guten Ergebnissen entgegengewirkt wird.This configuration creates a tension force in the straps that counteracts cracking. In combination with the bevelled edges of the straps in the area of the end faces, a completely new protective arrangement is created in this way, with which the tearing of the wood can be counteracted with surprisingly good results with little technical effort.

Claims (17)

1. Schalungsträger aus Holz mit eiem Ober- und einem Untergurt (1, 2) und einem diese verbindenden Vollwand- oder Gittersteg (3), der mit den Gurten (1, 2) über mehrere in diese eingreifende Zinken (4) zum Verleimen verbunden ist, wobei der Ober- und der Untergurt (1, 2) aus je einem Holzbalken bestehen, dessen Enden jeweils mit einer Schutzanordnung versehen sind, dadurch gekennzeichnet, daß die Schutzanordnung aus mindestens einem stab- oder bolzenartigen Verstärkungselement (5) besteht, das die Enden der Gurte (1, 2) senkrecht zur Ebene des Steges (3) durchsetzt.1. Wooden formwork girder with an upper and a lower flange (1, 2) and a full wall or lattice web (3) connecting them, which is connected to the belts (1, 2) by means of several tines (4) engaging in them for gluing is, the upper and lower chords (1, 2) each consist of a wooden beam, the ends of which are each provided with a protective arrangement, characterized in that the protective arrangement consists of at least one rod-like or bolt-like reinforcing element (5) which forms the The ends of the straps (1, 2) penetrate perpendicular to the plane of the web (3). 2. Schalungsträger nach Anspruch 1, dadurch gekennzeichnet, daß die Schutzanordnung an jedem Gurtende zwei stab- oder bolzenartige Verstärkungselemente (5) umfaßt.2. Formwork support according to claim 1, characterized in that the protective arrangement comprises two rod-like or bolt-like reinforcing elements (5) at each end of the belt. 3. Schalungsträger nach Anspruch 1 oder 2, mit mindestens zwei stab- oder bolzenartigen Verstärkugselementen je Gurtende, dadurch gekennzeichnet, daß die Verstärkungselemente (5) im Gurtende mittig und nebeneinander angeordnet sind.3. Formwork beam according to claim 1 or 2, with at least two rod-like or bolt-like reinforcing elements per belt end, characterized in that the reinforcing elements (5) are arranged centrally and next to one another in the belt end. 4. Schalungsträger nach Anspruch 1 oder 2, mit mindestens zwei stab- oder bolzenartigen Verstärkungselementen je Gurtende, dadurch gekennzeichnet, daß die Verstärkungselemente (5) im Gurtende außermittig und gegeneinander versetzt angeordnet sind.4. Formwork beam according to claim 1 or 2, with at least two rod-like or bolt-like reinforcing elements per belt end, thereby characterized in that the reinforcing elements (5) are arranged eccentrically and offset in the belt end. 5. Schalungsträger nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Verstärkungselemente (5) in Form von Dübeln ausgebildet sind.5. formwork support according to one or more of claims 1 to 4, characterized in that the reinforcing elements (5) are designed in the form of dowels. 6. Schalungsträger nach Anspruch 5, dadurch gekennzeichnet, daß der Querschnitt der Dübel rund ist.6. Formwork beam according to claim 5, characterized in that the cross section of the dowels is round. 7. Schalungsträger nach Anspruch 5, dadurch gekennzeichnet, daß der Querschnitt der Dübel quadratisch, rechteckig, viereckig oder langlochartig hergestellt ist.7. formwork support according to claim 5, characterized in that the cross section of the dowels is made square, rectangular, square or oblong. 8. Schalungsträger nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die stab- oder bolzenartigen Verstärkungselemente (5) in den Gurten formschlüssig verankert sind.8. formwork support according to one or more of claims 1 to 7, characterized in that the rod-like or bolt-like reinforcing elements (5) are positively anchored in the straps. 9. Schalungsträger nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die stab- oder bolzenartigen Verstärkunselemente (5) im Bereich ihrer Enden mit formschlüssigen Verankerungselementen (6)ausgestattet sind.9. formwork support according to one or more of claims 1 to 8, characterized in that the rod-like or bolt-like reinforcing elements (5) are equipped in the region of their ends with form-fitting anchoring elements (6). 1O. Schalungsträger nach Anspruch 9, dadurch gekennzeichnet, daß die Verankerungselemente (6) als Verbreiterungen oder Kopf ausgebildet sind.1O. Formwork support according to claim 9, characterized in that the anchoring elements (6) are designed as widenings or heads. 11. Schalungsträger nach Anspruch 1O, dadurch gekennzeichnet, daß der Kopf als Senkkopf, Zylinderkopf, Linsenkopf o.dgl. ausgebildet ist.11. Formwork beam according to claim 1O, characterized in that the head or the like as a countersunk head, cylinder head, lens head or the like. is trained. 12. Schalungsträger nach einem oder mehreren der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die stab- oder bolzenartigen Verstärkungselemente (5) aus Kunststoff bestehen.12. formwork support according to one or more of claims 1 to 11, characterized in that the rod-like or bolt-like reinforcing elements (5) consist of plastic. 13. Schalungsträger nach einem oder mehreren der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die stab- oder bolzenartigen Verstärkunselemente aus Holz oder Metall bestehen.13. Formwork beam according to one or more of claims 1 to 11, characterized in that the rod-like or bolt-like reinforcing elements consist of wood or metal. 14. Schalungsträger nach den Ansprüchen 8 bis 13, dadurch gekennzeichnet, daß die stab- oder bolzenartigen Verstärkungselemente (5) und die Verankerungselemente (6) einstückig ausgebildet sind.14. Formwork beam according to claims 8 to 13, characterized in that the rod-like or bolt-like reinforcing elements (5) and the anchoring elements (6) are integrally formed. 15. Schalungsträger nach Anspruch 8 und 9, dadurch gekennzeichnet, daß die Verstärkungselemente (5) jeweils in Form einer Hohlniet ausgebildet sind.15. formwork support according to claim 8 and 9, characterized in that the reinforcing elements (5) are each in the form of a hollow rivet. 16. Schalungsträger nach Anspruch 15, dadurch gekennzeichnet, daß die Hohlniet aus Aluminium besteht.16. Formwork beam according to claim 15, characterized in that the hollow rivet consists of aluminum. 17. Schalungsträger nach einem oder mehreren der vorhergehenden Ansprüche 1 bis 16, dadurch gekennzeichnet, daß die Kanten der Gurte (1,2) im Bereich der Stirnflächen abgeschrägt sind.17. Formwork beam according to one or more of the preceding claims 1 to 16, characterized in that the edges of the straps (1,2) are chamfered in the region of the end faces.
EP87110922A 1986-07-28 1987-07-28 Wooden supporting member for forms Expired - Lifetime EP0255110B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87110922T ATE57415T1 (en) 1986-07-28 1987-07-28 FORMWORK BEAM MADE OF WOOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8620170U 1986-07-28
DE8620170U DE8620170U1 (en) 1986-07-28 1986-07-28 Formwork beams made of wood

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EP0255110A2 true EP0255110A2 (en) 1988-02-03
EP0255110A3 EP0255110A3 (en) 1988-09-14
EP0255110B1 EP0255110B1 (en) 1990-10-10

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ID=6796873

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Application Number Title Priority Date Filing Date
EP87110922A Expired - Lifetime EP0255110B1 (en) 1986-07-28 1987-07-28 Wooden supporting member for forms

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EP (1) EP0255110B1 (en)
AT (1) ATE57415T1 (en)
DE (2) DE8620170U1 (en)
ES (1) ES2017973B3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT409013B (en) * 1993-02-13 2002-05-27 Peri Gmbh HOLZGURTTRÄGER
US8225580B2 (en) 2003-02-11 2012-07-24 Doka Industrie Gmbh Formwork support with filler material in recesses of top and bottom chords and having end-face protectors overlying ends of the top and bottom chords

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8620170U1 (en) * 1986-07-28 1986-11-06 Österreichische Doka Schalungs- und Gerüstungstechnik GmbH, Amstetten Formwork beams made of wood

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1953361U (en) * 1965-12-10 1967-01-12 Louis Risi-Hess FORMWORK BEAM.
DE3432654A1 (en) * 1984-09-05 1986-03-13 Österreichische Doka Schalungs- und Gerüstungstechnik GmbH, Amstetten Wooden shuttering girder
DE3443283A1 (en) * 1984-11-28 1986-05-28 Hünnebeck GmbH, 4030 Ratingen Wooden girder
DE8620170U1 (en) * 1986-07-28 1986-11-06 Österreichische Doka Schalungs- und Gerüstungstechnik GmbH, Amstetten Formwork beams made of wood

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1953361U (en) * 1965-12-10 1967-01-12 Louis Risi-Hess FORMWORK BEAM.
DE3432654A1 (en) * 1984-09-05 1986-03-13 Österreichische Doka Schalungs- und Gerüstungstechnik GmbH, Amstetten Wooden shuttering girder
DE3443283A1 (en) * 1984-11-28 1986-05-28 Hünnebeck GmbH, 4030 Ratingen Wooden girder
DE8620170U1 (en) * 1986-07-28 1986-11-06 Österreichische Doka Schalungs- und Gerüstungstechnik GmbH, Amstetten Formwork beams made of wood

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT409013B (en) * 1993-02-13 2002-05-27 Peri Gmbh HOLZGURTTRÄGER
US8225580B2 (en) 2003-02-11 2012-07-24 Doka Industrie Gmbh Formwork support with filler material in recesses of top and bottom chords and having end-face protectors overlying ends of the top and bottom chords

Also Published As

Publication number Publication date
DE8620170U1 (en) 1986-11-06
DE3765494D1 (en) 1990-11-15
EP0255110A3 (en) 1988-09-14
EP0255110B1 (en) 1990-10-10
ATE57415T1 (en) 1990-10-15
ES2017973B3 (en) 1991-03-16

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