EP2021557A1 - Wooden lattice beam for construction - Google Patents

Wooden lattice beam for construction

Info

Publication number
EP2021557A1
EP2021557A1 EP07722219A EP07722219A EP2021557A1 EP 2021557 A1 EP2021557 A1 EP 2021557A1 EP 07722219 A EP07722219 A EP 07722219A EP 07722219 A EP07722219 A EP 07722219A EP 2021557 A1 EP2021557 A1 EP 2021557A1
Authority
EP
European Patent Office
Prior art keywords
grooves
struts
pins
glued
straps
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
Application number
EP07722219A
Other languages
German (de)
French (fr)
Other versions
EP2021557B1 (en
Inventor
Artur Schwörer
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.)
Peri GmbH
Original Assignee
Peri GmbH
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 Peri GmbH filed Critical Peri GmbH
Publication of EP2021557A1 publication Critical patent/EP2021557A1/en
Application granted granted Critical
Publication of EP2021557B1 publication Critical patent/EP2021557B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • 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
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/26—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of wood
    • 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
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0486—Truss like structures composed of separate truss elements
    • E04C2003/0491—Truss like structures composed of separate truss elements the truss elements being located in one single surface or in several parallel surfaces

Definitions

  • the invention relates to a lattice girder made of wood for the construction sector with an upper belt and a lower belt, which are connected by struts, which each have at their ends pins, the
  • lattice girders are used, for example, as a carrier in a formwork of concrete structures to be concreted, in particular of concrete ceilings and walls.
  • Generic lattice girders are known for example from the publications DE 18 07 956 Bl or DE 18 17 718 Al.
  • these lattice girders there are grooves in the straps which extend in the longitudinal direction of the straps, the side surfaces of the grooves being aligned parallel to one another. These grooves are usually milled.
  • the pins are worked out of the ends of the struts. Since the struts in generic
  • Lattice girders usually oblique, with an angle of approximately 45% on the
  • the pins have a triangular basic shape in their plane parallel to the longitudinal direction of the struts.
  • the pins are thereby formed by introducing parallel to this longitudinal sections cuts in the ends of the struts. So they also have mutually parallel side surfaces.
  • US 3,452,501 discloses a lattice girder made of wood for the construction sector with an upper belt and a lower belt, which are connected by struts, which each have at their ends pins.
  • the pins are each one end of the struts in grooves of the upper belt, which run in the longitudinal direction of the upper belt, glued and the pins of each of the other end of the struts in grooves of the lower belt, which run in the longitudinal direction of the lower belt glued.
  • the grooves are not adapted in their length to the dimensions of the pins but extend along the entire length of the straps, in another embodiment, the grooves are adapted to the dimensions of the pins. These grooves have a diamond-shaped cross-section.
  • the grooves are executed with diamond-shaped cross-section.
  • these are very expensive to produce.
  • Even with a milling cutter, the grooves with diamond-shaped cross-section would be very difficult ausformbar.
  • the invention has for its object to provide a lattice girder and a method for producing the lattice girder, which avoids the disadvantages of the prior art, in particular a permanently strong connection between the straps and the struts is achieved in a wider tolerance range, with a simple production the lattice girder should be possible.
  • the lattice girder according to the invention made of wood for the construction sector has an upper belt and a lower belt, which are interconnected by struts on.
  • the struts have each at the ends of pins, wherein the pins of one end of the struts in grooves of the upper belt which extend in the longitudinal direction of the upper belt, glued and the pins of the other end of the struts in grooves of the lower belt, the run in the longitudinal direction of the lower belt, are glued.
  • the length of the grooves in the longitudinal direction of the straps at least substantially corresponds to the dimensions of the pin or pin inserted and glued into the respective groove, ie the grooves each extend only over a partial length of the straps.
  • the side surfaces each extending in the longitudinal direction of each of the grooves include an acute angle and with these
  • the pins are tapered by the inclusion of the acute angle from the side surfaces towards their ends and the width of the grooves perpendicular to the longitudinal direction of the straps decreases correspondingly towards their respective groove bottom.
  • the cross sections of the grooves are rectangular or substantially rectangular.
  • the cross sections of the pins inserted into the grooves are advantageously shaped accordingly so that a snug fit of the pins is achieved in the grooves. If several pins inserted into a groove, so is the cross section of the Spigot formed in the groove structure preferably preformed rectangular.
  • the pins can fill and seal the volume of the grooves in such a way that no contaminants can penetrate into the grooves.
  • the rectangular design of the cross sections of the grooves allows easy production of the lattice girder according to the invention, since such grooves can be easily prepared by means of circular saw blades. In this case, at least two circular saw cuts are introduced, each with an angle to each other angled cutting plane to form a groove in a respective belt. Thus, a cost-effective and rapid production of the lattice girder according to the invention is possible.
  • ends of the struts each have two pins, a construction with high load capacity is achieved without too high production costs for forming the structures to be glued.
  • This space can be the Leimmengen, the Assemble the struts with the straps are displaced by the pressing of the side surfaces of the pins on the side surfaces of the grooves record, so that insertion of the pins in the grooves is possible without resulting from these Leimmengen displacement resistance.
  • the grooves of the grooves in the longitudinal direction of the straps each have a semicircular profile
  • the grooves can be cut by means of several inclined saw blades successively in the rotating belt.
  • two adjacent struts are interlinked in the region of their ends glued in grooves of one of the straps. This allows power transmission from strut to strut. A transverse load can be better absorbed by the lattice girder according to the invention.
  • the glued ends are preferably interlocked with each other via a fine galvanizing of adjacent pins.
  • Fine galvanizing forms a high contact surface due to the zigzag shape of the surfaces to be joined formed by the fine galvanizing. When gluing such trained contact surfaces a great strength is achieved.
  • the mutually toothed ends in the longitudinal direction of the straps each form a semicircular profile.
  • the corresponding edges of the obliquely adjacent to each other Struts then have an elliptical shape together with the semicircular profile.
  • Such shaped toothed ends, or pins can be accurately positioned in correspondingly shaped grooves.
  • the contact surfaces to be bonded that is to say the side surfaces of the pins and the associated side surfaces of the grooves, are maximized in terms of their area, which leads to particularly strong gluing and thus to particularly stable lattice girders.
  • the grooves in the straps in side view on circular and / or oval-shaped faces are adapted to the corresponding tine profiles of the struts.
  • the pins of the struts are glued into the grooves of the straps.
  • a first of the running in the longitudinal directions of the straps is produced by introducing a first circular saw cut formed.
  • the second of the side surfaces of this groove extending in the longitudinal directions of the straps is formed by inserting a second circular saw cut.
  • the cutting planes of the circular saw cuts are set according to the acute angle to be generated between the side surfaces of the groove.
  • FIG. 1a shows a section of a lattice girder according to the invention.
  • FIG. 1 b shows the section of the lattice girder according to the invention from FIG. 1 a in an exploded view.
  • FIG. 2 shows the section of the lattice girder according to the invention from FIGS. 1 in a side view.
  • FIG. 3 shows a strut of the lattice girder from FIGS.
  • FIG. 1a shows the section in an assembled state
  • FIG. 1b shows the section in an exploded view.
  • the lattice girder 1 has the dimensions that are common for such lattice girders in the construction sector.
  • the lattice girder 1 is a few meters long and its struts 2 and 4.5 straps are a few inches thick.
  • the lattice girder 1 has an upper belt 4 and a lower belt 5.
  • the straps 4,5 are connected to each other by struts 2.
  • the struts 2 are obliquely on the straps 4,5, wherein the struts 2 with the straps 4,5 approximately enclose an angle of 45 °.
  • the struts 2 each have at their ends two pins 7.
  • the straps 4,5 point in the longitudinal direction extending grooves 9, wherein in each case a groove 9 is associated with a pin 7.
  • a pin 7 is glued into the associated groove 9.
  • the pins 7 each one end of the struts 2 are thus glued into grooves 9 of the upper belt 4 and the pins 7 each of the other end of the struts 2 are glued into grooves 9 of the lower belt 5.
  • each of a groove 9 forms an acute angle
  • the surfaces 10 of the peg 7 glued into these respective side surfaces 12 enclose a corresponding acute angle.
  • the respective side surfaces 10,12 of the pin 7 and the grooves 9 are therefore not parallel to each other.
  • the pins 7 thereby taper towards their ends. Accordingly, the width of the grooves 9 decreases perpendicular to the longitudinal direction of the straps 4,5 in the direction of their groove bottom by the inclusion of the acute angle.
  • the pins 7 are glued in the grooves 9 with their respective side surfaces 10,12 fit. In each case two adjacent struts 2 are interlocked in the region of their glued in grooves 9 of the straps 4.5 ends.
  • the ends of the struts 2 and the pins 7 at their adjoining areas a fine galvanizing 14.
  • This fine galvanizing 14 consists in each case of a zigzag profiling of the regions formed on these regions, the profilings of the adjacent regions being complementary to one another in such a way that they intermesh with one another so that the corresponding lateral surfaces of the pins 7 and the struts 2 are respectively in a level.
  • the zigzag profiles of the Fei nverzin kung 14 can be seen in the figures in the adjacent to the pins 7 areas of the struts 2.
  • the groove bases of the grooves 9 each have a semicircular profile in the longitudinal direction of the straps 4, 5.
  • a corresponding semicircular profile 16 form the mutually toothed ends of the struts 2, or the toothed pin 7 in the longitudinal direction of the straps 4,5 respectively. That together with the associated edges of the struts 2 an ellipse shape is formed. As a result, the mutually glued side surfaces 10 are formed over a large area.
  • FIG. 2 shows a side view of the section of the lattice girder according to the invention from FIGS.
  • the dimensions of the pins 7, as they are positioned in the belts 4, 5 in the glued state, are indicated by semicircular dashed lines 20.
  • the semicircular profiles of the interlocking pin 7 and the groove bases correspond to these dashed lines 20 (simplified representation without tine play).
  • the dimension of the Feinverzinkungen 14 with respect to the depth of their mutual engagement in the respective adjacent strut 2 by two parallel dashed lines in the adjacent regions of the adjacent struts is shown.
  • FIG. 3 shows a single strut 2 of the lattice girder from FIGS. 1.
  • the tapering shape of the studs 7, which is formed by the formation of an acute angle through the respective lugs, can be clearly recognized
  • a lattice girder 1 made of wood for the construction sector with an upper belt 4 and a lower belt 5, which are connected by struts 2, each having at their ends pin 7, with each other, the pins 7 each end of the struts 2 in Grooves 9 of the upper belt 4, which extend in the longitudinal direction of the upper belt 4, are glued and the pins 7 each of the other end of the struts 2 in grooves 9 of the lower belt 5, which extend in the longitudinal direction of the lower belt 5, glued.
  • the side surfaces 12 extending in each of the longitudinal directions in each case one of the grooves 9 form an acute angle and the surfaces 10 of the peg 7 glued into these respective side surfaces 12 enclose a corresponding acute angle.
  • the invention is not limited to the embodiments given above. Rather, a number of variants are conceivable, which make use of the features of the invention even with fundamentally different type of execution.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

A wooden lattice beam (1) for construction is disclosed, comprising an upper beam (4) and a lower beam (5), connected to each other by struts (2), having tenons (7) at the ends thereof, the tenons (7) on one end of the struts (2) are glued into mortises (9) on the upper beam (4), running in the the longitudinal direction of the upper beam (4) and the tenons (7) on the other end of the struts (2) are glued into mortises (9) on the lower beam (5), running in the longitudinal direction of the lower beam (5). The lateral surfaces (12) of a mortise (9) running in the longitudinal direction thereof are arranged at an acute angle to each other and the surfaces (10) of the tenon (7) glued to said lateral surfaces (12) in said mortise (9) have a corresponding acute angle to each other.

Description

Gitterträger aus Holz für den Baubereich Lattice girders made of wood for the construction sector
Die Erfindung betrifft einen Gitterträger aus Holz für den Baubereich mit einem oberen Gurt und einem unteren Gurt, die durch Streben, die jeweils an deren Enden Zapfen aufweisen, miteinander verbunden sind, wobei dieThe invention relates to a lattice girder made of wood for the construction sector with an upper belt and a lower belt, which are connected by struts, which each have at their ends pins, the
■ Zapfen jeweils eines Endes der Streben in Nuten des oberen Gurts, die inPins each one end of the struts in grooves of the upper strap, which in
Längsrichtung des oberen Gurts verlaufen, verleimt sind und die Zapfen jeweils des anderen Endes der Streben in Nuten des unteren Gurts, die inRun longitudinally of the upper belt, glued and the pins of each of the other end of the struts in grooves of the lower belt, in
Längsrichtung des unteren Gurts verlaufen, verleimt sind. Derartige Gitterträger werden z.B. als Träger bei einer Schalung von zu betonierenden Betonstrukturen, insbesondere von Betondecken und - wänden, eingesetzt. Gattungsgemäße Gitterträger sind z.B. aus den Druckschriften DE 18 07 956 Bl oder DE 18 17 718 Al bekannt. Bei diesen Gitterträgern sind in den Gurten Nuten vorhanden, die in Längsrichtung der Gurte verlaufen, wobei die Seitenflächen der Nuten parallel zueinander ausgerichtet sind. Diese Nuten werden üblicherweise gefräst. Die Zapfen sind aus den Enden der Streben herausgearbeitet. Da die Streben bei gattungsgemäßenLength of the lower belt run, are glued. Such lattice girders are used, for example, as a carrier in a formwork of concrete structures to be concreted, in particular of concrete ceilings and walls. Generic lattice girders are known for example from the publications DE 18 07 956 Bl or DE 18 17 718 Al. In these lattice girders, there are grooves in the straps which extend in the longitudinal direction of the straps, the side surfaces of the grooves being aligned parallel to one another. These grooves are usually milled. The pins are worked out of the ends of the struts. Since the struts in generic
Gitterträgern üblicherweise schräg, mit einem Winkel von ca. 45% auf dieLattice girders usually oblique, with an angle of approximately 45% on the
Gurte stehen, haben die Zapfen eine Dreieckgrundform in ihrer Ebene parallel zur Längsrichtung der Streben. Die Zapfen sind dabei .durch Einbringen von zu dieser Längsrichtung parallelen Schnitten in die Enden der Streben ausgebildet. Sie weisen also auch parallel zueinander stehende Seitenflächen auf.Belts stand, the pins have a triangular basic shape in their plane parallel to the longitudinal direction of the struts. The pins are thereby formed by introducing parallel to this longitudinal sections cuts in the ends of the struts. So they also have mutually parallel side surfaces.
Beim Verleimen der Zapfen in den Nuten wird Holzleim auf die Seitenflächen der Zapfen und/oder der Nuten aufgebracht. Da die Zapfen und die Nuten, gemäß einer Nut- und Federverbindung auf Passung gearbeitet sind, wird der Leim beim Einschieben der Zapfen in die Nuten von den Seitenflächen in den Nutgrund verschoben. Bei schlechter Toleranzlage verbleibt daher häufig zu wenig Leim an den Seitenoberflächen, um eine dauerhaft feste Verleimung sicher zu stellen.When gluing the pins in the grooves, wood glue is applied to the side surfaces of the pins and / or the grooves. Since the pins and the grooves, worked according to a tongue and groove connection on fit, the glue is displaced during the insertion of the pins in the grooves of the side surfaces in the groove bottom. In the case of a poor tolerance position, therefore, there is often too little glue left on the side surfaces in order to ensure a permanently firm gluing.
Die US 3,452,501 offenbart einen Gitterträger aus Holz für den Baubereich mit einem oberen Gurt und einem unteren Gurt, die durch Streben, die jeweils an deren Enden Zapfen aufweisen, miteinander verbunden sind. Dabei sind die Zapfen jeweils eines Endes der Streben in Nuten des oberen Gurts, die in Längsrichtung des oberen Gurts verlaufen, verleimt und die Zapfen jeweils des anderen Endes der Streben in Nuten des unteren Gurts, die in Längsrichtung des unteren Gurts verlaufen, verleimt. In einer Ausführungsform der Nuten sind die Nuten in ihrer Länge nicht an die Abmessungen der Zapfen angepasst sondern verlaufen entlang der gesamten Länge der Gurte, ϊn einer anderen Ausführungsform sind die Nuten an die Abmessungen der Zapfen angepasst. Diese Nuten weisen einen rautenförmigen Querschnitt auf.US 3,452,501 discloses a lattice girder made of wood for the construction sector with an upper belt and a lower belt, which are connected by struts, which each have at their ends pins. In this case, the pins are each one end of the struts in grooves of the upper belt, which run in the longitudinal direction of the upper belt, glued and the pins of each of the other end of the struts in grooves of the lower belt, which run in the longitudinal direction of the lower belt glued. In one embodiment of the grooves, the grooves are not adapted in their length to the dimensions of the pins but extend along the entire length of the straps, in another embodiment, the grooves are adapted to the dimensions of the pins. These grooves have a diamond-shaped cross-section.
Die nicht an die Abmessungen der Zapfen aπgepassten Nuten haben den Nachteil, dass Verschmutzungen und/oder Wasser in die Nuten eindringen können. Letzteres kann zu einem frühzeitigen Lösen der Verleimung führen.The not aπgepaßt to the dimensions of the pin grooves have the disadvantage that dirt and / or water can penetrate into the grooves. The latter can lead to premature loosening of the glue.
Zur Vermeidung dieser Problematik können z.B. die Nuten mit rautenförmigem Querschnitt ausgeführt werden. Diese sind jedoch nur sehr aufwändig herstellbar. Selbst mit einer Fräse wären die Nuten mit rautenförmiger Querschnitt nur sehr schwer ausformbar.To avoid this problem, e.g. the grooves are executed with diamond-shaped cross-section. However, these are very expensive to produce. Even with a milling cutter, the grooves with diamond-shaped cross-section would be very difficult ausformbar.
Der Erfindung liegt die Aufgabe zugrunde, einen Gitterträger und ein Verfahren zur Herstellung des Gitterträgers bereitzustellen, welche die Nachteile des Standes der Technik vermeidet, insbesondere wobei eine dauerhaft feste Verbindung zwischen den Gurten und den Streben in einem größeren Toleranzbereich erreicht wird, wobei eine einfache Herstellung des Gitterträgers möglich sein soll.The invention has for its object to provide a lattice girder and a method for producing the lattice girder, which avoids the disadvantages of the prior art, in particular a permanently strong connection between the straps and the struts is achieved in a wider tolerance range, with a simple production the lattice girder should be possible.
Diese Aufgabe wird durch den Gitterträger und dessen Herstellungsverfahren nach den unabhängigen Ansprüchen gelöst. Die abhängigen Ansprüche stellen bevorzugte Ausführungsformen der Erfindung dar. Der erfindungsgemäße Gitterträger aus Holz für den Baubereich weist einen oberen Gurt und einen unteren Gurt, die durch Streben miteinander verbunden sind, auf. Die Streben weisen jeweils an deren Enden Zapfen auf, wobei die Zapfen jeweils eines Endes der Streben in Nuten des oberen Gurts , die in Längsrichtung des oberen Gurts verlaufen, verleimt sind und die Zapfen jeweils des anderen Endes der Streben in Nuten des unteren Gurts, die in Längsrichtung des unteren Gurts verlaufen, verleimt sind. Dabei entspricht jeweils die Länge der Nuten in Längsrichtung der Gurte den Abmessungen der oder des in die jeweilige Nut eingesetzten und verleimten Zapfens zumindest im Wesentlichen, d.h. die Nuten erstrecken sich jeweils lediglich über eine Teillänge der Gurte.This object is achieved by the lattice girder and its manufacturing method according to the independent claims. The dependent claims represent preferred embodiments of the invention. The lattice girder according to the invention made of wood for the construction sector has an upper belt and a lower belt, which are interconnected by struts on. The struts have each at the ends of pins, wherein the pins of one end of the struts in grooves of the upper belt which extend in the longitudinal direction of the upper belt, glued and the pins of the other end of the struts in grooves of the lower belt, the run in the longitudinal direction of the lower belt, are glued. In this case, in each case the length of the grooves in the longitudinal direction of the straps at least substantially corresponds to the dimensions of the pin or pin inserted and glued into the respective groove, ie the grooves each extend only over a partial length of the straps.
Die in den Längsrichtungen verlaufenden Seitenoberflächen jeweils einer der Nuten schließen einen spitzen Winkel ein und die mit diesenThe side surfaces each extending in the longitudinal direction of each of the grooves include an acute angle and with these
Seitenoberflächen verleimten Oberflächen des in die jeweilige Nut verleimten Zapfens schließen einen entsprechenden spitzen Winkel ein.Side surfaces glued surfaces of the pin glued into the respective groove include a corresponding acute angle.
Die Zapfen verjüngen sich durch das Einschließen des spitzen Winkeis von den Seitenoberflächen in Richtung ihrer Enden und die Breite der Nuten senkrecht zur Längsrichtung der Gurte verringert sich in Richtung ihres jeweiligen Nutgrundes entsprechend.The pins are tapered by the inclusion of the acute angle from the side surfaces towards their ends and the width of the grooves perpendicular to the longitudinal direction of the straps decreases correspondingly towards their respective groove bottom.
Erfindungsgemäß sind die Querschnitte der Nuten rechteckförmig oder im Wesentlichen rechteckförmig ausgeführt. Auch die Querschnitte der in die Nuten eingesetzten Zapfen sind vorteilhaft entsprechend ausgeformt damit ein passgenauer Sitz der Zapfen in den Nuten erreicht wird. Sind mehrere Zapfen in eine Nut eingesetzt, so ist der Querschnitt der von den Zapfen ausgebildeten in die Nut eingesetzten Struktur bevorzugt entsprechend rechteckförmig ausgeführt.According to the invention, the cross sections of the grooves are rectangular or substantially rectangular. The cross sections of the pins inserted into the grooves are advantageously shaped accordingly so that a snug fit of the pins is achieved in the grooves. If several pins inserted into a groove, so is the cross section of the Spigot formed in the groove structure preferably preformed rectangular.
So wird auf die Seitenoberflächen aufgebrachter Leim nicht, oder nur unwesentlich, beim Einschieben der Zapfen in die Nuten in Richtung der Nutgründe verschoben. Der Leim verbleibt an den Oberflächen, wodurch ausreichend Leim zu einer festen und dauerhaften Verleimung der Seitenoberflächen an Ort und Stelle verbleibt. Durch die längenangepasste Ausformung der Nuten können die Zapfen das Volumen der Nuten derart ausfüllen und abdichten, dass keine Verschmutzungen in die Nuten eindringen können. Die rechteckförmige Ausbildung der Querschnitte der Nuten ermöglicht eine einfache Herstellung des erfindungsgemäßen Gitterträgers, da derartige Nuten einfach mittels Kreissägeblättern hergestellt werden können. Dabei werden zumindest zwei Kreissägeschnitte mit jeweils zueinander abgewinkelter Schnittebene zur Ausbildung einer Nut in einen jeweiligen Gurt eingebracht. So ist eine kostengünstige und rasche Herstellung des erfindungsgemäßen Gitterträgers möglich.Thus, glue applied to the side surfaces is not displaced, or only insignificantly, when the pins are inserted into the grooves in the direction of the groove bottoms. The glue remains on the surfaces, leaving sufficient glue for a firm and permanent gluing of the side surfaces in place. Due to the length-adapted shaping of the grooves, the pins can fill and seal the volume of the grooves in such a way that no contaminants can penetrate into the grooves. The rectangular design of the cross sections of the grooves allows easy production of the lattice girder according to the invention, since such grooves can be easily prepared by means of circular saw blades. In this case, at least two circular saw cuts are introduced, each with an angle to each other angled cutting plane to form a groove in a respective belt. Thus, a cost-effective and rapid production of the lattice girder according to the invention is possible.
Wenn die Enden der Streben jeweils zwei Zapfen aufweisen, wird eine Konstruktion mit hoher Tragfähigkeit erreicht, ohne dass zu hoher Herstellungsaufwand zur Ausformung der zu verleimenden Strukturen entsteht.If the ends of the struts each have two pins, a construction with high load capacity is achieved without too high production costs for forming the structures to be glued.
Bevorzugt liegt zwischen dem nutgrundseitigen Ende der Zapfen und dem Nutgrund der Nut, in den der jeweilige Zapfen verleimt ist, ein Zwischenraum. Dieser Zwischenraum kann die Leimmengen, die beim Zusammenfügen der Streben mit den Gurten durch das Anpressen der Seitenoberflächen der Zapfen an die Seitenoberflächen der Nuten verdrängt werden, aufnehmen so dass ein Einschieben der Zapfen in die Nuten ohne einen von diesen Leimmengen entstehenden Verdrängungswiderstand möglich ist.Preferably lies between the nutgrundseitigen end of the pin and the groove bottom of the groove into which the respective pin is glued, a gap. This space can be the Leimmengen, the Assemble the struts with the straps are displaced by the pressing of the side surfaces of the pins on the side surfaces of the grooves record, so that insertion of the pins in the grooves is possible without resulting from these Leimmengen displacement resistance.
Wenn die Nutgründe der Nuten in Längsrichtung der Gurte jeweils ein Halbkreisprofil aufweisen, können die Nuten mittels mehrerer geneigter Sägeblätter nacheinander in die des rotierenden Gurtes eingeschnitten werden.If the grooves of the grooves in the longitudinal direction of the straps each have a semicircular profile, the grooves can be cut by means of several inclined saw blades successively in the rotating belt.
Vorteilhaft sind jeweils zwei benachbarte Streben im Bereich ihrer in Nuten eines der Gurte verleimten Enden miteinander verzahnt. Dadurch wird eine Kraftübertragung von Strebe zu Strebe ermöglicht. Eine Querbelastung kann dadurch vom erfindungsgemäßen Gitterträger besser aufgenommen werden.Advantageously, two adjacent struts are interlinked in the region of their ends glued in grooves of one of the straps. This allows power transmission from strut to strut. A transverse load can be better absorbed by the lattice girder according to the invention.
Dabei sind die verleimten Enden bevorzugt über eine Feinverzinkung aneinandergrenzender Zapfen miteinander verzahnt. Eine Feinverzinkung bildet durch die von der Feinverzinkung ausgebildete Zickzackform der zu verbindenden Oberflächen eine hohe Kontaktfläche aus. Bei einer Verleimung derart ausgebildeter Kontaktflächen wird eine große Festigkeit erreicht.The glued ends are preferably interlocked with each other via a fine galvanizing of adjacent pins. Fine galvanizing forms a high contact surface due to the zigzag shape of the surfaces to be joined formed by the fine galvanizing. When gluing such trained contact surfaces a great strength is achieved.
Besonders bevorzugt bilden die miteinander verzahnten Enden in Längsrichtung der Gurte jeweils ein Halbkreisprofil aus. Die entsprechenden Kanten der schräg aufeinander stehenden benachbarten Streben weisen dann zusammen mit dem Halbkreisprofil eine Ellipsenform auf. Derartig ausgeformte verzahnte Enden, bzw. Zapfen, können passgenau in entsprechend ausgeformten Nuten positioniert werden. Durch die Halbkreisprofilierung werden die zu verleimenden Kontaktflächen, also die Seitenoberflächen der Zapfen und die zugehörigen Seitenoberflächen der Nuten, hinsichtlich ihrer Fläche maximiert, was zu einer besonders festen Verleimung und damit zu besonders stabilen Gitterträgern führt.Particularly preferably, the mutually toothed ends in the longitudinal direction of the straps each form a semicircular profile. The corresponding edges of the obliquely adjacent to each other Struts then have an elliptical shape together with the semicircular profile. Such shaped toothed ends, or pins, can be accurately positioned in correspondingly shaped grooves. As a result of the semicircular profiling, the contact surfaces to be bonded, that is to say the side surfaces of the pins and the associated side surfaces of the grooves, are maximized in terms of their area, which leads to particularly strong gluing and thus to particularly stable lattice girders.
In einer anderen Ausführungsform der Erfindung weisen die Nuten in den Gurten in Seitenansicht kreis- und/oder ovalförmige Teilflächen auf, an die entsprechende Zinkenprofile der Streben angepasst sind.In another embodiment of the invention, the grooves in the straps in side view on circular and / or oval-shaped faces, are adapted to the corresponding tine profiles of the struts.
Zur Herstellung von erfindungsgemäßen Gitterträgem werden die Zapfen der Streben in die Nuten der Gurte verleimt. Dabei wird zur Anfertigung der Nuten bevorzugt mittels eines Kreissägeblattes eine erste der in den Längsrichtungen der Gurte verlaufenden SeitenoberfläcFfen jeweils einer Nut, durch Einbringen eines ersten Kreissägeschnitts, ausgebildet. Dann wird die zweite der in den Längsrichtungen der Gurte verlaufenden Seitenoberflächen dieser Nut durch Einbringen eines zweiten Kreissägeschnitts ausgebildet. Die Schnittebenen der Kreissägeschnitte werden entsprechend des zu erzeugenden spitzen Winkels zwischen den Seitenoberflächen der Nut eingestellt.To produce lattice girders according to the invention, the pins of the struts are glued into the grooves of the straps. In this case, for the production of the grooves preferably by means of a circular saw blade, a first of the running in the longitudinal directions of the straps SeitenoberfläcFfen each of a groove, by introducing a first circular saw cut formed. Then, the second of the side surfaces of this groove extending in the longitudinal directions of the straps is formed by inserting a second circular saw cut. The cutting planes of the circular saw cuts are set according to the acute angle to be generated between the side surfaces of the groove.
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnungen näher erläutert. Figur Ia zeigt einen Abschnitt eines erfindungsgemäßen Gitterträgers.The invention will be explained in more detail using an exemplary embodiment with reference to the drawings. FIG. 1a shows a section of a lattice girder according to the invention.
Figur Ib zeigt den Abschnitt des erfindungsgemäßen Gitterträgers aus Figur Ia in einer Explosionsdarstellung.FIG. 1 b shows the section of the lattice girder according to the invention from FIG. 1 a in an exploded view.
Figur 2 zeigt den Abschnitt des erfindungsgemäßen Gitterträgers aus den Figuren 1 in einer Seitenansicht.FIG. 2 shows the section of the lattice girder according to the invention from FIGS. 1 in a side view.
Figur 3 zeigt eine Strebe des Gitterträgers aus den Figuren 1.FIG. 3 shows a strut of the lattice girder from FIGS.
Die Figuren der Zeichnungen zeigen den erfindungsgemäßen Gegenstand stark schematisiert und sind nicht maßstäblich zu verstehen. Die einzelnen Bestandteile des erfindungsgemäßen Gegenstandes sind so dargestellt, dass ihr Aufbau gut gezeigt werden kann.The figures of the drawings show the subject matter of the invention in a highly schematic manner and are not to scale. The individual components of the article according to the invention are shown so that their structure can be well shown.
In den Figuren 1 ist ein Abschnitt eines erfindungsgemäßen Gitterträgers 1 dargestellt. Figur Ia zeigt den Abschnitt in zusammengefügtem Zustand und Figur Ib zeigt den Abschnitt in einer Explosionsdarstellung. Der Gitterträger 1 hat die Abmessungen, die für derartige Gitterträger im Baubereich üblich sind. Der Gitterträger 1 ist einige Meter lang und dessen Streben 2 und die Gurte 4,5 sind einige Zentimeter stark. Der Gitterträger 1 weist einen oberen Gurt 4 und einen unteren Gurt 5 auf.. Die Gurte 4,5 sind durch Streben 2 miteinander verbunden. Die Streben 2 stehen schräg auf die Gurte 4,5, wobei die Streben 2 mit den Gurten 4,5 ca. einen Winkel von 45° einschließen. Die Streben 2 weisen jeweils an deren Enden zwei Zapfen 7 auf. Die Gurte 4,5 weisen in deren Längsrichtung verlaufende Nuten 9 auf, wobei jeweils eine Nut 9 einem Zapfen 7 zugeordnet ist. Im zusammengefügten Zustand ist jeweils ein Zapfen 7 in die zugehörige Nut 9 verleimt. Die Zapfen 7 jeweils eines Endes der Streben 2 sind also in Nuten 9 des oberen Gurts 4 verleimt und die Zapfen 7 jeweils des anderen Endes der Streben 2 sind in Nuten 9 des unteren Gurts 5 verleimt. Die in den Längsrichtungen verlaufenden Seitenoberflächen 12 jeweils einer Nut 9 schließen einen spitzen Winkel ein und die mit diesen Seitenoberflächen 12 verleimten Oberflächen 10 des in die jeweilige Nut 9 verleimten Zapfens 7 schließen einen entsprechenden spitzen Winkel ein. Die jeweiligen Seitenoberflächen 10,12 der Zapfen 7 bzw. der Nuten 9 stehen also nicht parallel zueinander. Die Zapfen 7 verjüngen sich dadurch in Richtung ihrer Enden. Entsprechend nimmt die Breite der Nuten 9 senkrecht zur Längsrichtung der Gurte 4,5 in Richtung ihres Nutgrundes durch das Einschließen des spitzen Winkels ab. Im zusammengefügten Zustand sind die Zapfen 7 in den Nuten 9 mit deren jeweiligen Seitenoberflächen 10,12 passgenau verleimt. Jeweils zwei benachbarte Streben 2 sind im Bereich ihrer in Nuten 9 eines der Gurte 4,5 verleimten Enden miteinander verzahnt. Dazu weisen die Enden der Streben 2 und die Zapfen 7 an ihren aneinander angrenzenden Bereichen eine Feinverzinkung 14 auf. Diese Feinverzinkung 14 besteht aus jeweils einer an diesen Bereichen ausgebildeten Zickzackprofilierung der Bereiche, wobei die Profilierungen der benachbarten Bereiche zueinander derart komplementär ausgebildet sind, dass diese auf Passung ineinander verzahnen, so dass die sich entsprechenden seitlichen Oberflächen der Zapfen 7 und der Streben 2 jeweils in einer Ebene verlaufen. Die Zickzackprofilierungen der Fei nverzin kung 14 sind in den Figuren in den an die Zapfen 7 angrenzenden Bereichen der Streben 2 erkennbar.In the figures 1, a portion of a lattice girder 1 according to the invention is shown. FIG. 1a shows the section in an assembled state and FIG. 1b shows the section in an exploded view. The lattice girder 1 has the dimensions that are common for such lattice girders in the construction sector. The lattice girder 1 is a few meters long and its struts 2 and 4.5 straps are a few inches thick. The lattice girder 1 has an upper belt 4 and a lower belt 5. , The straps 4,5 are connected to each other by struts 2. The struts 2 are obliquely on the straps 4,5, wherein the struts 2 with the straps 4,5 approximately enclose an angle of 45 °. The struts 2 each have at their ends two pins 7. The straps 4,5 point in the longitudinal direction extending grooves 9, wherein in each case a groove 9 is associated with a pin 7. In the assembled state, in each case a pin 7 is glued into the associated groove 9. The pins 7 each one end of the struts 2 are thus glued into grooves 9 of the upper belt 4 and the pins 7 each of the other end of the struts 2 are glued into grooves 9 of the lower belt 5. The side surfaces 12 extending in the longitudinal directions, each of a groove 9, form an acute angle, and the surfaces 10 of the peg 7 glued into these respective side surfaces 12 enclose a corresponding acute angle. The respective side surfaces 10,12 of the pin 7 and the grooves 9 are therefore not parallel to each other. The pins 7 thereby taper towards their ends. Accordingly, the width of the grooves 9 decreases perpendicular to the longitudinal direction of the straps 4,5 in the direction of their groove bottom by the inclusion of the acute angle. In the assembled state, the pins 7 are glued in the grooves 9 with their respective side surfaces 10,12 fit. In each case two adjacent struts 2 are interlocked in the region of their glued in grooves 9 of the straps 4.5 ends. For this purpose, the ends of the struts 2 and the pins 7 at their adjoining areas a fine galvanizing 14. This fine galvanizing 14 consists in each case of a zigzag profiling of the regions formed on these regions, the profilings of the adjacent regions being complementary to one another in such a way that they intermesh with one another so that the corresponding lateral surfaces of the pins 7 and the struts 2 are respectively in a level. The zigzag profiles of the Fei nverzin kung 14 can be seen in the figures in the adjacent to the pins 7 areas of the struts 2.
Die Nutgründe der Nuten 9 weisen in Längsrichtung der Gurte 4,5 jeweils ein Halbkreisprofil auf. Ein entsprechendes Halbkreisprofil 16 bilden die miteinander verzahnten Enden der Streben 2, bzw. die verzahnten Zapfen 7 in Längsrichtung der Gurte 4,5 jeweils aus. D.h. zusammen mit den zugehörigen Kanten der Streben 2 wird eine Ellipsenform ausgebildet. Dadurch sind die miteinander verleimten Seitenoberflächen 10 großflächig ausgebildet.The groove bases of the grooves 9 each have a semicircular profile in the longitudinal direction of the straps 4, 5. A corresponding semicircular profile 16 form the mutually toothed ends of the struts 2, or the toothed pin 7 in the longitudinal direction of the straps 4,5 respectively. That together with the associated edges of the struts 2 an ellipse shape is formed. As a result, the mutually glued side surfaces 10 are formed over a large area.
In Figur 2 ist der Abschnitt des erfindungsgemäßen Gitterträgers aus den Figuren 1 in einer Seitenansicht dargestellt. Dabei sind die Abmessungen der Zapfen 7, wie diese in den Gurten 4,5 im verleimten Zustand positioniert sind, mit halbkreisförmigen gestrichelten Linien 20 eingezeichnet. Die Halbkreisprofile der miteinander verzahnten Zapfen 7 und der Nutgründe entsprechen diesen gestrichelten Linien 20 (vereinfachte Darstellung ohne Zinkenspiel). Weiter ist die Abmessung der Feinverzinkungen 14 hinsichtlich der Tiefe ihres gegenseitigen Eingreifens in die jeweils benachbarte Strebe 2 durch jeweils zwei parallel verlaufende gestrichelte Linien in den angrenzenden Bereichen der benachbarten Streben dargestellt.FIG. 2 shows a side view of the section of the lattice girder according to the invention from FIGS. The dimensions of the pins 7, as they are positioned in the belts 4, 5 in the glued state, are indicated by semicircular dashed lines 20. The semicircular profiles of the interlocking pin 7 and the groove bases correspond to these dashed lines 20 (simplified representation without tine play). Further, the dimension of the Feinverzinkungen 14 with respect to the depth of their mutual engagement in the respective adjacent strut 2 by two parallel dashed lines in the adjacent regions of the adjacent struts is shown.
Figur 3 zeigt eine einzelne Strebe 2 des Gitterträgers aus den Figuren 1. Gut zu erkennen ist die sich verjüngende Form der Zapfen 7, die durch das Ausbilden eines spitzen Winkels durch die jeweiligenFIG. 3 shows a single strut 2 of the lattice girder from FIGS. 1. The tapering shape of the studs 7, which is formed by the formation of an acute angle through the respective lugs, can be clearly recognized
Seitenoberflächen 10 eines jeden Zapfens 7 ausgebildet wird. Weiter ist die Ausformung der Feinverzinkung 14 im Bereich der an ihre Nachbarstrebe angrenzenden Bereiche der Enden der Strebe 2 und die zugehörige Zickzackprofilierung 30 dargestellt. Jeweils eine Zacke 31 einer jeweiligen Zickzackprofilierung 30 eines Endes der Strebe 2 ist über die gesamte Länge jeweils eines Zapfens 7 geführt.Side surfaces 10 of each pin 7 is formed. Next is the shape of the fine galvanizing 14 in the area at their Neighboring strut adjacent areas of the ends of the strut 2 and the associated zigzag profiling 30 shown. In each case a tine 31 of a respective zigzag profiling 30 of one end of the strut 2 is guided over the entire length of a respective pin 7.
Vorgeschlagen wird ein Gitterträger 1 aus Holz für den Baubereich mit einem oberen Gurt 4 und einem unteren Gurt 5, die durch Streben 2, die jeweils an deren Enden Zapfen 7 aufweisen, miteinander verbunden sind, wobei die Zapfen 7 jeweils eines Endes der Streben 2 in Nuten 9 des oberen Gurts 4, die in Längsrichtung des oberen Gurts 4 verlaufen, verleimt sind und die Zapfen 7 jeweils des anderen Endes der Streben 2 in Nuten 9 des unteren Gurts 5, die in Längsrichtung des unteren Gurts 5 verlaufen, verleimt sind. Die in den Längsrichtungen verlaufenden Seitenoberflächen 12 jeweils einer der Nuten 9 schließen einen spitzen Winkel ein und die mit diesen Seitenoberflächen 12 verleimten Oberflächen 10 des in die jeweilige Nut 9 verleimten Zapfens 7 schließen einen entsprechenden spitzen Winkel ein.Proposed is a lattice girder 1 made of wood for the construction sector with an upper belt 4 and a lower belt 5, which are connected by struts 2, each having at their ends pin 7, with each other, the pins 7 each end of the struts 2 in Grooves 9 of the upper belt 4, which extend in the longitudinal direction of the upper belt 4, are glued and the pins 7 each of the other end of the struts 2 in grooves 9 of the lower belt 5, which extend in the longitudinal direction of the lower belt 5, glued. The side surfaces 12 extending in each of the longitudinal directions in each case one of the grooves 9 form an acute angle and the surfaces 10 of the peg 7 glued into these respective side surfaces 12 enclose a corresponding acute angle.
Die Erfindung beschränkt sich nicht auf die vorstehend angegebenen Ausführungsbeispiele. Vielmehr ist eine Anzahl von Varianten denkbar, welche auch bei grundsätzlich anders gearteter Ausführung von den Merkmalen der Erfindung Gebrauch machen. The invention is not limited to the embodiments given above. Rather, a number of variants are conceivable, which make use of the features of the invention even with fundamentally different type of execution.

Claims

Patentansprüche claims
1. Gitterträger (1) aus Holz für den Baubereich mit einem oberen Gurt (4) und einem unteren Gurt (5), die durch Streben (2), die jeweils an deren Enden Zapfen (7) aufweisen, miteinander verbunden sind, wobei die Zapfen (7) jeweils eines Endes der Streben (2) in Nuten (9) des oberen Gurts (4), die in Längsrichtung des oberen Gurts (4) verlaufen, eingesetzt und verleimt sind und die Zapfen (7) jeweils des anderen Endes der Streben (2) in Nuten (9) des unteren Gurts1. lattice girder (1) made of wood for the construction sector with an upper belt (4) and a lower belt (5), which by struts (2), each having at their ends pins (7) are interconnected, wherein the Pins (7) in each case one end of the struts (2) in grooves (9) of the upper belt (4) extending in the longitudinal direction of the upper belt (4) are inserted and glued and the pins (7) respectively of the other end of the Struts (2) in grooves (9) of the lower belt
(5), die in Längsrichtung des unteren Gurts (5) verlaufen, eingesetzt und verleimt sind, wobei die Länge der Nuten in Längsrichtung der Gurte den Abmessungen der darin eingesetzten Zapfen entsprechen oder im Wesentlichen entsprechen, und wobei die in den Längsrichtungen verlaufenden Seitenoberflächen (12) jeweils einer der Nuten (9) einen spitzen Winkel einschließen und die mit diesen Seitenoberflächen (12) verleimten Oberflächen (10) des in die jeweilige Nut (9) verleimten Zapfens (7) einen entsprechenden spitzen Winkel einschließen, dadurch gekennzeichnet, dass die Querschnitte der Nuten rechteckförmig oder im Wesentlichen rechteckförmig ausgeführt sind.(5) which run in the longitudinal direction of the lower belt (5), are inserted and glued, wherein the length of the grooves in the longitudinal direction of the straps correspond to or substantially correspond to the dimensions of the pins inserted therein, and wherein the side surfaces extending in the longitudinal directions ( 12) in each case one of the grooves (9) enclose an acute angle and the surfaces (10) of the peg (7) glued into the respective groove (9) with these side surfaces (12) enclose a corresponding acute angle, characterized in that Cross sections of the grooves are rectangular or substantially rectangular.
2. Gitterträger nach Anspruch 1, dadurch gekennzeichnet, dass die Enden der Streben (2) jeweils zwei Zapfen (7) aufweisen. 2. lattice girder according to claim 1, characterized in that the ends of the struts (2) each have two pins (7).
3. Gitterträger nach mindestens einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass zwischen dem nutgrundseitigen Ende der Zapfen (7) und dem Nutgrund der Nut (9), in den der jeweilige Zapfen (7) verleimt ist, ein Zwischenraum liegt.3. lattice girder according to at least one of claims 1 to 2, characterized in that between the nutgrundseitigen end of the pin (7) and the groove bottom of the groove (9), in which the respective pin (7) is glued, a gap.
4. Gitterträger nach mindestens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Nutgründe der Nuten (9) in Längsrichtung der Gurte (4,5) jeweils ein Halbkreisprofil (20) aufweisen.4. lattice girder according to at least one of claims 1 to 3, characterized in that the groove bases of the grooves (9) in the longitudinal direction of the straps (4,5) each have a semicircular profile (20).
5. Gitterträger nach mindestens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Nuten (9) in den Gurten (4,5) in Seitenansicht kreis- und/oder ovalförmige Teilflächen aufweisen und dass die entsprechenden5. lattice girder according to at least one of claims 1 to 4, characterized in that the grooves (9) in the straps (4,5) in side view circular and / or oval-shaped faces and that the corresponding
Zinkenprofile der Streben entsprechend an diese Teilflächen angepasst sind.Tine profiles of the struts are adapted accordingly to these faces.
6. Gitterträger nach mindestens einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass jeweils zwei benachbarte Streben (2) im Bereich ihrer in Nuten (9) eines der Gurte (4,5) verleimten Enden miteinander verzahnt sind.6. lattice girder according to at least one of claims 1 to 5, characterized in that in each case two adjacent struts (2) in the region of their in grooves (9) of one of the straps (4.5) glued ends are interlocked.
7. Gitterträger nach Anspruch 6, dadurch gekennzeichnet, dass die verleimten Enden über eine Feinverzinkung (14) aneinandergrenzender Zapfen (7) miteinander verzahnt sind. 7. lattice girder according to claim 6, characterized in that the glued ends on a fine galvanizing (14) adjacent pins (7) are interlocked with each other.
8. Gitterträger nach mindestens einem der Ansprüche 6 bis 7, dadurch gekennzeichnet, dass die miteinander verzahnten Enden in Längsrichtung der Gurte jeweils ein Halbkreisprofil ausbilden.8. lattice girder according to at least one of claims 6 to 7, characterized in that the mutually toothed ends in the longitudinal direction of the belts each form a semicircular profile.
9. Verfahren zur Hersteilung eines Gitterträgers nach mindestens einem der Ansprüche 1 bis 8, wobei die Zapfen (7) der Streben (2) in die Nuten (9) der Gurte (4,5) verleimt werden, dadurch gekennzeichnet, dass mittels eines Kreissägeblattes eine erste der in den Längsrichtungen der Gurte (4,5) verlaufenden Seitenoberflächen (12) jeweils einer Nut (9) durch Einbringen eines ersten Kreissägeschnitts ausgebildet wird und die zweite der in den Längsrichtungen der Gurte (4,5) verlaufenden Seitenoberflächen (12) der Nut (9) durch Einbringen eines zweiten Kreissägeschnitts ausgebildet wird, wobei die Schnittebenen der Kreissägeschnitte entsprechend des zu erzeugenden spitzen Winkels zwischen den Seitenoberflächen (12) der Nut (9) eingestellt werden. 9. A method for producing a lattice girder according to at least one of claims 1 to 8, wherein the pins (7) of the struts (2) in the grooves (9) of the straps (4,5) are glued, characterized in that by means of a circular saw blade a first of the in the longitudinal directions of the straps (4,5) extending side surfaces (12) in each case a groove (9) is formed by introducing a first circular saw section and the second of the in the longitudinal directions of the straps (4,5) extending side surfaces (12) the groove (9) is formed by inserting a second circular saw cut, the cutting planes of the circular saw cuts being set according to the acute angle to be generated between the side surfaces (12) of the groove (9).
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DE102006021731A1 (en) 2007-11-22
KR20080106591A (en) 2008-12-08

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