EP0476638A2 - Process for the connection of timber elements and connection device for them - Google Patents
Process for the connection of timber elements and connection device for them Download PDFInfo
- Publication number
- EP0476638A2 EP0476638A2 EP91115915A EP91115915A EP0476638A2 EP 0476638 A2 EP0476638 A2 EP 0476638A2 EP 91115915 A EP91115915 A EP 91115915A EP 91115915 A EP91115915 A EP 91115915A EP 0476638 A2 EP0476638 A2 EP 0476638A2
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- European Patent Office
- Prior art keywords
- spindle
- bore
- ring
- face
- beams
- 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.)
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Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003822 epoxy resin Substances 0.000 claims abstract description 12
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 13
- 210000004556 brain Anatomy 0.000 claims description 11
- 230000002787 reinforcement Effects 0.000 description 5
- 239000002023 wood Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Images
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
- E04B1/48—Dowels, i.e. members adapted to penetrate the surfaces of two parts and to take the shear stresses
Definitions
- the invention relates to a method for connecting wooden parts, in particular for attaching a first wooden beam z.
- two beams are screwed together by means of a spindle passing through both beams, and for this purpose a hole is preferably made in each beam with a superimposed countersunk hole at the beginning, both holes being aligned with one another in the connecting position of the beams.
- the two beams are firmly pulled against each other and clamped together using nuts that are screwed onto both spindle ends and tightened. Therefore, high frictional forces arise at the contact surfaces, which counteract a displacement of the two beams in the connection plane.
- a ring is introduced into the contact surfaces of the beams in the connecting plane, which concentrically surrounds the spindle at a distance from it and supports the resistance of the connection against shear forces.
- this method can only be used for connecting beams in which the spindle completely penetrates the beams, so that nuts can be screwed onto the spindle ends on both sides to clamp the beams.
- the method is therefore only used where there are intersecting beams or those with their ends against each other beams to be fastened are to be connected.
- the holes extend transversely to the grain of the beams.
- a bore is made in the longitudinal and fiber direction through the end face of the first beam, a threaded spindle made of metal is inserted into the bore except for an end section projecting from the end face and into the bore attached in particular is glued into this, a ring surrounding the spindle is inserted through the end face of the first beam into the end of the brain, in the second beam in alignment with the bore in the first beam position a continuous bore for receiving the end portion of the spindle the two bars in the connection position are arranged one on top of the other, the end section of the spindle extending through the bore in the second beam and the two beams being fastened to one another by screwing and tightening a nut on the end section of the spindle.
- connection process can be carried out with very simple means, and it permits extensive prefabrication in the production plant or in the workshop with subsequent assembly on the construction site.
- Fastening elements inserted in a wooden part in the direction of the fibers usually do not allow tensile stress. Due to a complicated spatial state of tension, so-called split tensile forces arise when individual tensile forces are introduced into the wooden part, in particular in a glulam body. Due to the anisotropy of the material wood, these splitting tensile forces result in impermissibly high transverse tensile stresses, which can lead to a transverse tensile fracture, especially in the end grain section. These transverse tensile stresses are additionally superimposed by transverse tensile stresses from swelling and vibratory movements.
- the essence of the method according to the invention is that a threaded spindle or threaded rod made of metal is glued into a fiber hole in the brain end of a wooden body to introduce a single load and with the introduction of a ring surrounding the spindle a transverse reinforcement in the area of the brain end of the wooden body referred to above as the first beam is reached.
- the ring prevents the wooden body from splitting in the area of the brain end near the face or connecting surface, where the splitting tensile forces have their maximum. If the ring also engages in the contact surface of the second beam, it additionally brings about a substantial increase in the shear strength of the connection in a similar manner to the known connection mentioned at the outset, which, however, is based on the two wooden parts being pressed together between the ends of a spindle. Experiments have already shown that a significant increase in the load capacities can be achieved with the connection method according to the invention.
- the method according to the invention can also be applied to the known connecting method mentioned at the outset, in which the wooden parts are screwed together or onto one another between the spindle ends and are pressed, if these are beams with a crossing fiber direction and the first Beam through which the spindle extends in the direction of the grain, is also suitable for a continuous spindle in length. Because even in this case, pressing the brain end of the first beam against the contact surface of the second beam results in splitting tensile forces, which are counteracted in the form of a ring with the transverse tensile reinforcement according to the invention can be, if necessary, on both brain ends of the first bar.
- the bore in the first beam in which the spindle is glued in is preferably carried out as a blind bore, which is consequently independent of the respective beam length.
- the spindle is preferably glued into the bore using epoxy resin. It is essential that the glue creates an absolutely firm connection with the bore wall and a positive connection with the thread of the spindle. In this way, tensile forces introduced via the spindle are evenly transmitted to the layers of the wooden part adjacent to the bore.
- the ring should preferably be arranged concentrically to the spindle in order to form a uniformly effective reinforcement.
- the diameter of the ring is to be dimensioned such that the wood core enclosed by the ring covers the area relevant for the strength of the connection and the splitting tensile forces acting beyond the ring cannot destroy the wood part under load.
- the ring is inserted into an annular groove in the end face of the first beam and glued in with epoxy resin. In this way, a positive connection between the ring and the surrounding layers of wood is brought about, so that a effective reinforcement is achieved.
- the ring is introduced with one half in the annular groove of the first beam and with the other half in an annular groove which is milled into the contact surface of the second beam concentrically with the bore. This significantly increases the shear strength of the connection. Prefabrication is also easily possible for this.
- the ring is preferably made of metal with a cross-sectional profile in the form of a rhombus. As a result, the ring can be easily inserted in any case, also driven in if necessary, and it has the strongest cross section in the connecting plane of the two wooden parts.
- the other half of the ring in the ring groove of the second beam can also be glued there in a form-fitting manner by means of epoxy resin in order to avoid the highest possible resistance to any displacement in the event of shear stresses.
- the free end of the spindle section is expediently arranged in the second bar by means of a counterbore. In this way, an invisible connection consisting exclusively of internal connecting elements is achieved if the counterbore is closed after the connection has been made.
- the invention also relates to a connection of wooden parts which can be produced by the above-mentioned and described method, specifically with the further training options shown above.
- a central bore 5 is made as a blind bore through the end face 7 of the beam 1 in the end of the brain.
- a steel and threaded spindle 6 is inserted and glued with epoxy resin 7 in the manner shown, so that an end portion 8 of the spindle 6 protrudes well beyond the end face 3.
- annular groove 9 is milled in a coaxial position at a significant distance from the bore 5 in the end face 3.
- an aluminum ring 10 with an approximately rhombic cross section is glued in such a way by means of epoxy resin 11 that one half of the ring is embedded and fastened in the annular groove 9 in a form-fitting manner, while the other half protrudes beyond the end face 3.
- a continuous bore 12 is guided through the beam 2 and is suitable for receiving the end section 12 of the spindle 6.
- the bore 12 On the side of the bar 2 facing away from the contact surface 4, the bore 12 overlaid by a counterbore 13, as shown.
- an annular groove 14 is milled out concentrically to the bore 12, which corresponds to the aforementioned annular groove 9.
- the annular groove 14 is provided with an epoxy resin filling 15 and the beam 2 is placed with its contact surface 4 on the end face 3 of the beam 1 so that the end portion 8 of the spindle 6 passes through the bore 12 and from which End face 3 protruding half of the ring 10 penetrates into the ring groove 14 filled with epoxy resin.
- a pressure ring 16 and a locking ring 17 are placed on the free end of the spindle 6, and a nut 18 is screwed on and tightened until a tension sufficient for the desired connection is reached.
- the epoxy resin filling 15 hardens, and the desired tensile, shear and pressure-resistant connection of the beams 1, 2 is achieved.
- the two beams 1, 2 connected to one another have mutually crossing fiber directions and the bore receiving the spindle runs in the fiber direction of the first beam 1. Nevertheless, the spindle can withstand high tensile loads without the split tensile forces leading to a transverse tensile break.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
- Rod-Shaped Construction Members (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Connections Arranged To Contact A Plurality Of Conductors (AREA)
- Connector Housings Or Holding Contact Members (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Verbinden von Holzteilen, insbesondere zum Befestigen eines ersten Balkens aus Holz z. B. eines Brettschichtholzkörpers an einem Zweiten Balken senkrecht zu diesem derart, daß der erste Balken mit der Stirnfläche seines Hirnendes an dem zweiten Balken anliegt.The invention relates to a method for connecting wooden parts, in particular for attaching a first wooden beam z. B. a glulam body on a second bar perpendicular to this such that the first bar rests with the end face of its brain end on the second bar.
Zum Verbinden von zwei Holzteilen insbesondere Balken in senkrecht gegeneinander stoßender Lage sind eine Reihe von Verfahren bekannt, von denen diejenigen Verfahren im Zusammenhang mit der Erfindung von Interesse sind, bei denen innenliegende Verbindungselemente verwendet werden.A number of methods are known for connecting two wooden parts, in particular beams in a mutually perpendicular position, of which those methods are of interest in connection with the invention in which internal connecting elements are used.
Bei einem dieser bekannten Verfahren werden zwei Balken mittels einer beide Balken durchsetzenden Spindel miteinander verschraubt, und hierfür wird in jedem Balken eine Bohrung vorzugsweise mit einer überlagerten Senkbohrung am Anfang angelegt, wobei beide Bohrungen in der Verbindungslage der Balken miteinander fluchten. Mittels auf beiden Spindelenden aufgeschraubter und festgespannter Muttern werden die beiden Balken fest gegeneinander gezogen und miteinander verspannt. An den Kontaktflächen entstehen deshalb hohe Reibkräfte, die einer Verschiebung der beiden Balken in der Verbindungsebene entgegenwirken. Zusätzlich wird in der Verbindungsebene ein Ring in die Kontaktflächen der Balken eingebracht, der die Spindel im Abstand von dieser konzentrisch umgibt und den Widerstand der Verbindung gegen Scherkräfte unterstützt.In one of these known methods, two beams are screwed together by means of a spindle passing through both beams, and for this purpose a hole is preferably made in each beam with a superimposed countersunk hole at the beginning, both holes being aligned with one another in the connecting position of the beams. The two beams are firmly pulled against each other and clamped together using nuts that are screwed onto both spindle ends and tightened. Therefore, high frictional forces arise at the contact surfaces, which counteract a displacement of the two beams in the connection plane. In addition, a ring is introduced into the contact surfaces of the beams in the connecting plane, which concentrically surrounds the spindle at a distance from it and supports the resistance of the connection against shear forces.
Dieses Verfahren ist jedoch nur zum Verbinden von Balken anwendbar, bei denen die Spindel die Balken vollständig durchsetzt, so daß beidseitig Muttern auf die Spindelenden zum Verspannen der Balken aufschraubbar sind. Deshalb wird das Verfahren auch nur dort angewendet, wo einander kreuzende Balken oder solche mit ihren Enden aneinander zu befestigende Balken zu verbinden sind. Die Bohrungen erstrecken sich quer zur Faserrichtung der Balken.However, this method can only be used for connecting beams in which the spindle completely penetrates the beams, so that nuts can be screwed onto the spindle ends on both sides to clamp the beams. The method is therefore only used where there are intersecting beams or those with their ends against each other beams to be fastened are to be connected. The holes extend transversely to the grain of the beams.
Besondere Probleme entstehen, wenn an der Stirnseite eines ersten Balkens ein Zweiter Balken senkrecht zu dem ersten befestigt werden muß, und zwar derart, daß auch Zuglasten, die die beiden Balken voneinander zu trennen streben, von der Verbindung aufgenommen werden. Denn in Faserrichtung der Balken lassen sich bekanntlich keine belastbaren Schraubverbindungen oder dergleichen herstellen. Hier müssen folglich beispielsweise seitliche Verbindungslaschen, die beide Balken überbrücken, angeschraubt werden, wobei die Schrauben quer zur Faserrichtung, in die Balken eingeschraubt werden. Oder es werden die Balken umgreifende Klammern gesetzt und an den Balken festgeschraubt.Particular problems arise when a second beam has to be fastened to the end face of a first beam perpendicular to the first, in such a way that tensile loads which tend to separate the two beams from one another are also absorbed by the connection. Because, as is well known, no robust screw connections or the like can be produced in the fiber direction of the beams. Here, for example, lateral connecting brackets that bridge both beams must be screwed on, the screws being screwed into the beams at right angles to the grain. Or brackets encompassing the bars are placed and screwed onto the bars.
Es besteht daher die Aufgabe, ein Verfahren zum Verbinden von senkrecht auf- bzw. gegeneinander stoßenden Holzteilen vorzugsweise Balken zu schaffen, mit dem eine zug- und scherfeste Verbindung von Balken, insbesondere auch mit kreuzender Faserrichtung sowie mit einfachen Mitteln, erreichbar ist.It is therefore an object of the invention to provide a method for connecting vertically abutting or mutually abutting wooden parts, preferably beams, with which a tensile and shear-resistant connection of beams, in particular also with a crossing fiber direction and with simple means, can be achieved.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß durch die Stirnfläche des ersten Balkens hindurch eine Bohrung in diesem in dessen Längs- und Faserrichtung angelegt wird, eine mit Gewinde versehene Spindel aus Metall bis auf einen von der Stirnseite vorstehenden Endabschnitt in die Bohrung eingeführt und in dieser befestigt insbesondere in diese eingeleimt wird, ein die Spindel mit Abstand umgebender Ring durch die Stirnfläche des ersten Balkens hindurch in das Hirnende eingebracht wird, in dem zweiten Balken in mit der Bohrung im ersten Balken fluchtender Lage eine durchgehende Bohrung zur Aufnahme des Endabschnitts der Spindel angelegt wird, die beiden Balken in der Verbindungslage aufeinander angeordnet werden, wobei sich der Endabschnitt der Spindel durch die Bohrung in dem zweiten Balken erstreckt und die beiden Balken durch Aufschrauben und Festziehen einer Mutter auf dem Endabschnitt der Spindel aneinander befestigt werden.This object is achieved in that a bore is made in the longitudinal and fiber direction through the end face of the first beam, a threaded spindle made of metal is inserted into the bore except for an end section projecting from the end face and into the bore attached in particular is glued into this, a ring surrounding the spindle is inserted through the end face of the first beam into the end of the brain, in the second beam in alignment with the bore in the first beam position a continuous bore for receiving the end portion of the spindle the two bars in the connection position are arranged one on top of the other, the end section of the spindle extending through the bore in the second beam and the two beams being fastened to one another by screwing and tightening a nut on the end section of the spindle.
Mit dieser erfindungsgemäßen Lösung wird erstmalig eine zug-, scher- und biegefeste Verbindung zwischen zwei senkrecht aufeinanderstehenden Balken oder anderweitigen Holzteilen mit innenliegenden Verbindungselementen erreicht, obwohl die Balken einander kreuzende Faserrichtungen haben. Das Verbindungsverfahren ist mit sehr einfachen Mitteln durchführbar, und es gestattet eine weitgehende Vorfertigung im Produktionsbetrieb bzw. in der Werkstatt mit anschließender Montage auf der Baustelle.With this solution according to the invention, for the first time a tensile, shear and bending-resistant connection between two perpendicular beams or other wooden parts with internal connecting elements is achieved, although the beams have mutually crossing fiber directions. The connection process can be carried out with very simple means, and it permits extensive prefabrication in the production plant or in the workshop with subsequent assembly on the construction site.
Trotz der außergewöhnlichen Festigkeit der Verbindung handelt es sich dabei um eine lösbare Schraubverbindung so daß die beiden miteinander verbundenen Holzteile im Bedarfsfall auch wieder voneinander getrennt und ggf. ein weiteres Mal miteinander verbunden werden können.Despite the exceptional strength of the connection, this is a detachable screw connection so that the two wooden parts connected to one another can also be separated from one another if necessary and connected again if necessary.
In einem Holzteil in Faserrichtung eingebrachte Verbindungselemente erlauben gewöhnlich keine Zugbeanspruchung. Aufgrund eines komplizierten räumlichen Spannungszustandes entstehen vielmehr bei der Einleitung von einzelnen Zugkräften in dem Holzteil, insbesondere in einem Brettschichtholzkörper, sogenannte Spaltzugkräfte. Bedingt durch die Anisotropie des Werkstoffes Holz ergeben sich aus diesen Spaltzugkräften unzulässig hohe Querzugspannungen, die vor allem bei einem Hirnholzendabschnitt zu einem Querzugbruch führen können. Überlagert werden diese Querzugspannungen noch zusätzlich durch Querzugspannungen aus Quellund Schwingbewegungen.Fastening elements inserted in a wooden part in the direction of the fibers usually do not allow tensile stress. Due to a complicated spatial state of tension, so-called split tensile forces arise when individual tensile forces are introduced into the wooden part, in particular in a glulam body. Due to the anisotropy of the material wood, these splitting tensile forces result in impermissibly high transverse tensile stresses, which can lead to a transverse tensile fracture, especially in the end grain section. These transverse tensile stresses are additionally superimposed by transverse tensile stresses from swelling and vibratory movements.
Der Kern des erfindungsgemäßen Verfahrens besteht darin daß zur Einleitung einer Einzellast eine mit Gewinde versehene Spindel oder Gewindestange aus Metall in eine in Faserrichtung verlaufende Bohrung im Hirnende eines Holzkörpers eingeklebt wird und mit dem Einbringen eines die Spindel mit Abstand umgebenden Ringes eine Querzugbewehrung im Bereich des Hirnendes des vorstehend als erster Balken bezeichneten Holzkörpers erreicht wird.The essence of the method according to the invention is that a threaded spindle or threaded rod made of metal is glued into a fiber hole in the brain end of a wooden body to introduce a single load and with the introduction of a ring surrounding the spindle a transverse reinforcement in the area of the brain end of the wooden body referred to above as the first beam is reached.
Der Ring verhindert ein Spalten des Holzkörpers im Bereich des Hirnendes nahe der Stirn- bzw. Verbindungsfläche, wo die Spaltzugkräfte ihr Maximum haben. Wenn der Ring gleichzeitig auch in die Kontaktfläche des zweiten Balkens greift, bewirkt er zusätzlich eine wesentliche Erhöhung der Scherfestigkeit der Verbindung in ähnlicher Weise wie bei der eingangs genannten bekannten Verbindung, die allerdings auf einem Zusammenpressen der beiden Holzteile zwischen den Enden einer Spindel beruht. Versuche haben bereits gezeigt, daß mit dem erfindungsgemäßen Verbindungsverfahren eine deutliche Steigerung der Traglasten erreichbar ist.The ring prevents the wooden body from splitting in the area of the brain end near the face or connecting surface, where the splitting tensile forces have their maximum. If the ring also engages in the contact surface of the second beam, it additionally brings about a substantial increase in the shear strength of the connection in a similar manner to the known connection mentioned at the outset, which, however, is based on the two wooden parts being pressed together between the ends of a spindle. Experiments have already shown that a significant increase in the load capacities can be achieved with the connection method according to the invention.
Es bedarf keiner besonderen Erwähnung, daß das erfindungsgemäße Verfahren auch auf das eingangs genannte bekannte Verbindungsverfahren anwendbar ist, bei dem die Holzteile zwischen den Spindelenden aneinander bzw. aufeinander geschraubt und - gepreßt werden, wenn es sich dabei um Balken mit kreuzender Faserrichtung handelt und der erste Balken durch den sich die Spindel in Faserrichtung erstreckt, sich von der Länge her noch für eine durchgehende Spindel eignet. Denn auch in diesem Falle ergeben sich durch das Anpressen des Hirnendes des ersten Balkens an die Kontaktfläche des zweiten Balkens Spaltzugkräfte, denen mit der erfindungsgemäßen Querzugbewehrung in Ringform entgegengewirkt werden kann, ggf. an beiden Hirnenden des ersten Balkens. Bisher sind solche Balkenverbindungen, bei denen sich die Gewindespindel in Faserrichtung erstreckt, überhaupt nicht herstellbar gewesen, ohne daß unzulässig, hohe Querzugspannungen entstehen, es sei denn, man hat eine äußere Bewehrung angebracht, die das Hirnende des Balkens unter Spannung einfaßt.There is no need to mention that the method according to the invention can also be applied to the known connecting method mentioned at the outset, in which the wooden parts are screwed together or onto one another between the spindle ends and are pressed, if these are beams with a crossing fiber direction and the first Beam through which the spindle extends in the direction of the grain, is also suitable for a continuous spindle in length. Because even in this case, pressing the brain end of the first beam against the contact surface of the second beam results in splitting tensile forces, which are counteracted in the form of a ring with the transverse tensile reinforcement according to the invention can be, if necessary, on both brain ends of the first bar. So far, such beam connections, in which the threaded spindle extends in the direction of the fibers, could not be produced at all without inadmissible, high transverse tensile stresses, unless an external reinforcement has been attached which holds the brain end of the beam under tension.
Die Bohrung in dem ersten Balken, in dem die Spindel eingeklebt wird, wird vorzugsweise als Blindbohrung ausgeführt, die folglich unabhängig von der jeweiligen Balkenlänge ist.The bore in the first beam in which the spindle is glued in is preferably carried out as a blind bore, which is consequently independent of the respective beam length.
Die Spindel wird vorzugsweise mittels Epoxidharz in der Bohrung eingeklebt. Es ist wesentlich, daß der Kleber eine absolut feste Verbindung mit der Bohrungswandung herstellt und eine formschlüssige Verbindung mit dem Gewinde der Spindel eingeht. Auf diese Weise werden über die Spindel eingeleitete Zugkräfte gleichmäßig auf die an die Bohrung angrenzenden Schichten des Holzteils übertragen.The spindle is preferably glued into the bore using epoxy resin. It is essential that the glue creates an absolutely firm connection with the bore wall and a positive connection with the thread of the spindle. In this way, tensile forces introduced via the spindle are evenly transmitted to the layers of the wooden part adjacent to the bore.
Der Ring soll vorzugsweise konzentrisch zu der Spindel angeordnet sein, um eine gleichmäßig wirksame Bewehrung zu bilden. Der Durchmesser des Ringes ist so zu bemessen., daß der von dem Ring eingefaßte Holzkern den für die Festigkeit der Verbindung maßgeblichen Bereich erfaßt und die jenseits des Ringes wirksamen Spaltzugkräfte das Holzteil unter Last nicht zerstören können.The ring should preferably be arranged concentrically to the spindle in order to form a uniformly effective reinforcement. The diameter of the ring is to be dimensioned such that the wood core enclosed by the ring covers the area relevant for the strength of the connection and the splitting tensile forces acting beyond the ring cannot destroy the wood part under load.
Erfindungsgemäß ist weiterhin vorgesehen, daß der Ring in eine Ringnut in der Stirnfläche des ersten Balkens eingesetzt und mit Epoxidharz eingeklebt wird. Auf diese Weise wird ein Formschluß zwischen dem Ring und den umgebenden Holzschichten herbeigeführt, so daß eine wirksame Bewehrung erreicht wird.According to the invention it is further provided that the ring is inserted into an annular groove in the end face of the first beam and glued in with epoxy resin. In this way, a positive connection between the ring and the surrounding layers of wood is brought about, so that a effective reinforcement is achieved.
Eine wesentliche erfindungsgemäße Weiterbildung besteht darin, daß der Ring mit einer Hälfte in der Ringnut des ersten Balkens und mit der anderen Hälfte in einer Ringnut eingebracht wird, die konzentrisch zu der Bohrung in die Kontaktfläche des zweiten Balkens eingefräst wird. Hierdurch wird die Scherfestigkeit der Verbindung wesentlich erhöht. Auch hierfür ist eine Vorfertigung ohne weiteres möglich.An essential development according to the invention is that the ring is introduced with one half in the annular groove of the first beam and with the other half in an annular groove which is milled into the contact surface of the second beam concentrically with the bore. This significantly increases the shear strength of the connection. Prefabrication is also easily possible for this.
Der Ring besteht vorzugsweise aus Metall mit einem Querschnittsprofil in der Form eines Rhombus. Dadurch läßt sich der Ring in jedem Falle leicht einsetzen,notfalls auch eintreiben, und er weist in der Verbindungsebene der beiden Holzteile den stärksten Querschnitt auf.The ring is preferably made of metal with a cross-sectional profile in the form of a rhombus. As a result, the ring can be easily inserted in any case, also driven in if necessary, and it has the strongest cross section in the connecting plane of the two wooden parts.
Die andere Hälfte des Ringes in der Ringnut des zweiten Balkens kann dort ebenfalls formschlüssig mittels Epoxidharz eingeklebt sein, um einen möglichst hohen Widerstand gegen jegliche Verschiebung im Falle von Scherbeanspruchungen zu vermeiden.The other half of the ring in the ring groove of the second beam can also be glued there in a form-fitting manner by means of epoxy resin in order to avoid the highest possible resistance to any displacement in the event of shear stresses.
Das freie Ende des Spindelabschnitts ist in dem zweiten Balken zweckmäßig mittels einer Senkbohrung angeordnet. Auf diese Weise erreicht man eine ausschließlich aus innenliegenden Verbindungselementen bestehende unsichtbare Verbindung, wenn die Senkbohrung nach Herstellung der Verbindung verschlossen wird.The free end of the spindle section is expediently arranged in the second bar by means of a counterbore. In this way, an invisible connection consisting exclusively of internal connecting elements is achieved if the counterbore is closed after the connection has been made.
Gegenstand der Erfindung ist auch eine Verbindung von Holzteilen, die nach dem vorgenannten und beschriebenen Verfahren herstellbar ist, und zwar mit den oben aufgezeigten Weiterbildungsmöglichkeiten.The invention also relates to a connection of wooden parts which can be produced by the above-mentioned and described method, specifically with the further training options shown above.
Ein Ausführungsbeispiel der Erfindung wird nachstehend mit Bezug auf die Zeichnung näher erläutert. In der Zeichnung ist ein Beispiel einer Verbindung von zwei Holzteilen mit kreuzender, d. h. einander durchsetzender Faserrichtung dargestellt.An embodiment of the invention is explained below with reference to the drawing. In the drawing is an example of a connection of two wooden parts with crossing, i.e. H. interpenetrating fiber direction shown.
Ein erster Balken 1, bestehend aus einem dreischichtigen Brettschichtholzkörper, wird mit einem quer hierzu verlaufenden zweiten Balken 2, der ebenfalls in dem gewählten Ausführungsbeispiel aus einem dreischichtigen Brettschichtholzkörper besteht, verbunden, so daß die Stirnfläche 3 des Balkens 1 fest gegen die Kontaktfläche 4 des Balkens 2 gezogen ist.A first beam 1, consisting of a three-layer glulam body, is connected to a
Durch die Stirnfläche 7 des Balkens 1 wird in dessen Hirnende eine zentrale Bohrung 5 als Blindbohrung ausgeführt. In diese Bohrung 5 wird eine aus Stahl bestehende und mit einem Gewinde versehene Spindel 6 eingeführt und mit Epoxidharz 7 in der dargestellten Weise eingeklebt, und zwar so, daß ein Endabschnitt 8 der Spindel 6 weit über die Stirnfläche 3 hinaus vorsteht.A
Eine Ringnut 9 wird in koaxialer Lage in deutlichem Abstand von der Bohrung 5 in der Stirnfläche 3 ausgefräst. In die Ringnut 9 wird ein aus Aluminium bestehender Ring 10 mit einem etwa rhombusförmigen Querschnitt derart mittels Epoxidharz 11 eingeklebt, daß die eine Ringhälfte in der Ringnut 9 formschlüssig eingebettet und befestigt ist, während die andere Hälfte über die Stirnfläche 3 hinaus vorsteht.An
Durch den Balken 2 wird eine durchgehende Bohrung 12 geführt, die zur Aufnahme des Endabschnitts 12 der Spindel 6 geeignet ist. An der der Kontaktfläche 4 abgewandten Seite des Balkens 2 wird die Bohrung 12 von einer Senkbohrung 13, wie dargestellt, überlagert. In der Kontaktfläche 4 wird konzentrisch zu der Bohrung 12 eine Ringnut 14 ausgefräst, die der vorgenannten Ringnut 9 entspricht.A
Zum Verbinden der beiden Balken 1, 2 wird die Ringnut 14 mit einer Epoxidharzfüllung 15 versehen und der Balken 2 so mit seiner Kontaktfläche 4 auf die Stirnfläche 3 des Balkens 1 aufgelegt, daß der Endabschnitt 8 der Spindel 6 die Bohrung 12 durchsetzt und die aus der Stirnfläche 3 vorstehende Hälfte des Ringes 10 in die mit Epoxidharz gefüllte Ringnut 14 eindringt. Wenn die Kontaktfläche 4 auf der Stirnfläche 3 aufliegt, wird auf das freie Ende der Spindel 6 ein Druckring 16 und ein Sicherungsring 17 aufgesetzt sowie eine Mutter 18 aufgeschraubt und festgezogen, bis eine für die gewünschte Verbindung ausreichende Zugspannung erreicht wird. Die Epoxidharzfüllung 15 härtet aus, und die gewünschte Zug-, scher- und druckfeste Verbindung der Balken 1, 2 ist erreicht.To connect the two
Die Wirkung und Vorteile der so hergestellten Verbindung zwischen den Balken 1, 2 sind bereits im ersten Teil der Beschreibung eingehend erläutert worden, so daß auf eine Wiederholung an dieser Stelle verzichtet wird.The effect and advantages of the connection thus established between the
Abschließend wird jedoch mit Bezug auf die Zeichnung noch einmal darauf hingewiesen , daß die beiden miteinander verbundenen Balken 1, 2 einander kreuzende Faserrichtungen haben und die die Spindel aufnehmende Bohrung in Faserrichtung des ersten Balkens 1 verläuft. Dennoch ist die Spindel mit hohen Zuglasten belastbar, ohne daß die Spaltzugkräfte zu einem Querzugbruch führen können.Finally, however, with reference to the drawing, it is again pointed out that the two
Claims (10)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4029726A DE4029726A1 (en) | 1990-09-20 | 1990-09-20 | METHOD FOR JOINING WOODEN PARTS AND JOINING WOODEN PARTS |
| DE4029726 | 1990-09-20 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0476638A2 true EP0476638A2 (en) | 1992-03-25 |
| EP0476638A3 EP0476638A3 (en) | 1992-05-27 |
| EP0476638B1 EP0476638B1 (en) | 1995-04-26 |
Family
ID=6414570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91115915A Expired - Lifetime EP0476638B1 (en) | 1990-09-20 | 1991-09-19 | Process for the connection of timber elements and connection device for them |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0476638B1 (en) |
| AT (1) | ATE121810T1 (en) |
| DE (2) | DE4029726A1 (en) |
| DK (1) | DK0476638T3 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1028126C2 (en) * | 2005-01-26 | 2006-07-27 | Venster Techniek B V | Connection method for wooden window frame post and lower horizontal frame member, comprises securing plug inside post cavity and securing fastener to plug and horizontal frame member |
| US7849647B2 (en) | 2000-01-06 | 2010-12-14 | Trussed, Inc. | Shear wall construction |
| CZ302525B6 (en) * | 2010-05-07 | 2011-06-29 | Ceské vysoké ucení technické v Praze, Fakulta stavební | Removable semi-rigid connection or joint of load-bearing bar construction wooden bars |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT399838B (en) * | 1993-07-20 | 1995-07-25 | Wirglauer Gottfried | WOOD JOINT FOR BLUNT BUTTING TWO BEAMS |
| DE20001250U1 (en) * | 2000-01-25 | 2001-05-31 | Sfs Ind Holding Ag Heerbrugg | Fastening element for connecting adjoining or abutting wooden profiles |
| DE20001249U1 (en) * | 2000-01-25 | 2001-05-31 | Sfs Ind Holding Ag Heerbrugg | Connection of adjacent or abutting wooden profiles |
| WO2022212861A1 (en) * | 2021-04-01 | 2022-10-06 | Simpson Strong-Tie Company, Inc. | System for filling voids in glued-in-rod structures |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2378550A (en) * | 1943-04-02 | 1945-06-19 | Frederic R Harris | Connector ring groove centering device |
| DE2220201A1 (en) * | 1972-04-25 | 1973-11-08 | Rudolf Wolter | WOOD JOINT |
| EP0072139A1 (en) * | 1981-08-10 | 1983-02-16 | Ensphere Concept International Inc. | A connector for a structural member |
| EP0263350A2 (en) * | 1986-10-06 | 1988-04-13 | Peter Bertsche | Connector for timber work |
-
1990
- 1990-09-20 DE DE4029726A patent/DE4029726A1/en not_active Withdrawn
-
1991
- 1991-09-19 AT AT91115915T patent/ATE121810T1/en not_active IP Right Cessation
- 1991-09-19 DE DE59105305T patent/DE59105305D1/en not_active Expired - Fee Related
- 1991-09-19 DK DK91115915.0T patent/DK0476638T3/en active
- 1991-09-19 EP EP91115915A patent/EP0476638B1/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2378550A (en) * | 1943-04-02 | 1945-06-19 | Frederic R Harris | Connector ring groove centering device |
| DE2220201A1 (en) * | 1972-04-25 | 1973-11-08 | Rudolf Wolter | WOOD JOINT |
| EP0072139A1 (en) * | 1981-08-10 | 1983-02-16 | Ensphere Concept International Inc. | A connector for a structural member |
| EP0263350A2 (en) * | 1986-10-06 | 1988-04-13 | Peter Bertsche | Connector for timber work |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7849647B2 (en) | 2000-01-06 | 2010-12-14 | Trussed, Inc. | Shear wall construction |
| NL1028126C2 (en) * | 2005-01-26 | 2006-07-27 | Venster Techniek B V | Connection method for wooden window frame post and lower horizontal frame member, comprises securing plug inside post cavity and securing fastener to plug and horizontal frame member |
| CZ302525B6 (en) * | 2010-05-07 | 2011-06-29 | Ceské vysoké ucení technické v Praze, Fakulta stavební | Removable semi-rigid connection or joint of load-bearing bar construction wooden bars |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE121810T1 (en) | 1995-05-15 |
| DE4029726A1 (en) | 1992-03-26 |
| EP0476638A3 (en) | 1992-05-27 |
| DK0476638T3 (en) | 1995-10-02 |
| EP0476638B1 (en) | 1995-04-26 |
| DE59105305D1 (en) | 1995-06-01 |
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