EP0137429B1 - Assembling knot for a three-dimensional framework, and three-dimensional framework comprising such a knot - Google Patents

Assembling knot for a three-dimensional framework, and three-dimensional framework comprising such a knot Download PDF

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Publication number
EP0137429B1
EP0137429B1 EP84111614A EP84111614A EP0137429B1 EP 0137429 B1 EP0137429 B1 EP 0137429B1 EP 84111614 A EP84111614 A EP 84111614A EP 84111614 A EP84111614 A EP 84111614A EP 0137429 B1 EP0137429 B1 EP 0137429B1
Authority
EP
European Patent Office
Prior art keywords
round tubes
joint
round
external threads
connection according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP84111614A
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German (de)
French (fr)
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EP0137429A2 (en
EP0137429A3 (en
Inventor
Erich Frantl
Peter Hofstätter
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BEER, MANFRED, DIPL.-ING.
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Individual
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Publication of EP0137429A3 publication Critical patent/EP0137429A3/en
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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
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19—Three-dimensional framework structures
    • E04B1/1903—Connecting nodes specially adapted therefor
    • E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
    • 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
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • 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
    • E04B1/19—Three-dimensional framework structures
    • E04B2001/1924—Struts specially adapted therefor
    • E04B2001/1927—Struts specially adapted therefor of essentially circular cross section
    • 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
    • E04B1/19—Three-dimensional framework structures
    • E04B2001/1957—Details of connections between nodes and struts
    • E04B2001/196—Screw connections with axis parallel to the main axis of the strut
    • 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
    • E04B1/19—Three-dimensional framework structures
    • E04B2001/1981—Three-dimensional framework structures characterised by the grid type of the outer planes of the framework
    • E04B2001/1984—Three-dimensional framework structures characterised by the grid type of the outer planes of the framework rectangular, e.g. square, grid

Definitions

  • the invention relates to a node connection for bar structures according to the introductory parts of independent claims 1 and 8.
  • the invention also relates to a bar structure which is produced with the node connections.
  • Known node connections of this type have the advantage that the rods introduce the tensile and compressive forces only mathematically precisely into the middle of the node pieces.
  • the round tubes serving as rods end on welded truncated cones with an axial bore.
  • a screw bolt protrudes through the bore, which is supported with its head inside the tube on the truncated cone and can be screwed into a bore of a knot piece made of solid material with its thread arranged at the front end.
  • a pipe or socket part is arranged, through which the screw bolt with its shaft passes.
  • the sleeve part is connected to the shaft of the bolt in such a way that the shaft slides in the sleeve part, but cannot rotate relative to it.
  • the screw bolt By turning the sleeve part, the screw bolt can be rotated and thus the screw connection between the round pipe and the node piece can be made or loosened.
  • the node connection described has many disadvantages. It is complex because of the large number of metal parts to be processed.
  • the welded connection between the round tube and the truncated cone is a weak point and the strength of the round tubes cannot therefore be exploited.
  • the high-strength bolts themselves are subject to notch stresses and do not create a rigid, but rather an articulated connection between the bars and the knot parts, since their core cross-sections act as flow joints when the bars are buckled.
  • the full buckling length up to the thread at the front end of the bolt must be taken into account.
  • the inherent rigidity of the framework is low. To insert the screw bolts, mounting holes are necessary in the pipes, which in turn make opposite drainage holes necessary and thus locally weaken the pipe cross-section.
  • the inner walls of the pipe are uncontrollably at risk of corrosion and it is hardly possible to protect the pipes from the effects of heat in the event of a fire.
  • the fire resistance is therefore not sufficient, in particular for the construction of halls in which people are staying or where planes are parked.
  • GB-A-395 931 shows a construction element in which the ends of bars connected with a knot are connected to one another by bar-shaped tensioning elements.
  • the tensioning elements are tensioned by nuts which are held in balls and which are screwed onto the external thread on thickened end sections of the tensioning elements.
  • the invention has for its object to provide a rigid node connection without weakening the more than two rods connected in a node and without the disadvantages mentioned and with less manufacturing effort.
  • the invention consists in a knot connection of the type mentioned above in that the core diameter of the external threads provided at the ends of the round tubes is at least as large as the outer diameter of the round tubes, that the cross-sectional area and the bending stiffness of the round tubes in the area of the external threads are at least the same size as in the remaining part of the round tubes, that the inside diameter of the union nuts is at least as large as the outside diameter of the round tubes, so that they can be pushed or rotated over the round tube, and that the length of the thread of the union nuts is substantially equal to the sum of the lengths the external thread is at the lugs and at the ends of the round tubes.
  • a filling of the cavities of the round tubes communicating via the node pieces is filled with liquid, e.g. B. water with the addition of corrosion protection and possibly antifreeze and the use of the liquid for heating, cooling and / or extinguishing in the event of fire, storage of solar heat od. Dgi. possible.
  • liquid e.g. B. water with the addition of corrosion protection and possibly antifreeze and the use of the liquid for heating, cooling and / or extinguishing in the event of fire, storage of solar heat od. Dgi. possible.
  • the knot piece is hollow and that the approaches of the knot piece have a continuous opening.
  • the connection between the round tube and the node piece is sealed to the outside and the flow through the tube system formed by the round tubes can be influenced.
  • the knot connection is used for liquid-filled rod structures, it can be provided that between the end of the round tube, which has the external thread, and the end of the neck, which has the external thread, of the node piece, a sealing ring which may act as a cross-section-reducing throttle (orifice) is arranged.
  • the openings in the approaches of the knot pieces have with The advantage is a diameter that is at least as large as the inside diameter of the round tubes.
  • the external threads at the ends of the round tubes can be deformed by plastic deformation, e.g. B. pressing, upsetting and / or rolling.
  • the external thread can, however, also be cut into the ends of the round tubes which are thickened by upsetting.
  • the core diameter of the external threads provided at the ends of the round tubes is at least as large as the outer diameter of the round tubes, that the cross-sectional area and the bending stiffness of the round tubes in the area of the external threads are at least the same size is, as in the rest of the round tubes, that the union nuts with the external threads provided on them are screwed into the internal thread of the attachment of the node piece and the round tubes are screwed into the internal thread provided in the union nuts, and that the internal thread and the external thread of the nut die have the same pitch and are arranged concentrically to each other and that the external threads at the ends of the round tubes, the threads of the union nuts and the threads in the approaches are essentially of the same length.
  • This embodiment is assembled by successively inserting the ends of the round tubes, on the threadless section of which the union nuts are arranged, into the corresponding approaches of two knot pieces to be connected by the round tube. Then the union nuts are screwed onto the external thread of the round tubes and into the internal thread of the lugs.
  • the internal thread and the external thread of the union nuts are arranged in the same longitudinal section thereof and that the round tubes extend into the knot piece.
  • union nuts have proven itself, which is characterized in that the union nuts are designed as sleeves with a helical, wavy cross section.
  • the union nuts designed as sleeves have at one end an outwardly projecting ring which lies against the end face of the attachment of the node piece via an outer sealing ring, and that an inner sealing ring is arranged between the internal thread of the union nuts and the round tubes is.
  • the union nuts are designed as a screw helix, the space between the screw turns in the area in which the round tube extends into the knot wrench being filled with a sealing compound.
  • a sealed connection between the node piece and the round tube is achieved.
  • the union nuts can also be used as sleeves with recesses, e.g. B. cast helix.
  • the helix can also be composed of two differently profiled wire halves in cross section.
  • a framework with node connections according to the invention according to claims 1 to 7 or 8 to 13 is advantageously communicating via the node pieces with a liquid, for. B. water, filled and connected to a liquid circuit.
  • the node pieces and / or the round tubes can be equipped with a valve that opens due to excess pressure and / or excess temperature.
  • the source of the fire and the framework can be sprayed with water, similar to a sprinkler system.
  • the pipe wall is cooled by the resulting flow in the pipe.
  • FIG. 1 shows a rod structure in an oblique view from above
  • FIG. 2 shows a knot piece in a simplified representation
  • FIG. 3 to 6 shows different embodiments of ends of round tubes adjoining the knot piece according to FIG. 2
  • FIG. 7 shows a knot connection in cross section
  • 8 shows another embodiment of a knot connection in cross section
  • FIG. 9 shows an embodiment of a union nut for the knot connection according to FIG.
  • a rod structure in the form of a typical two-layer space framework which consists of node pieces 1 and rods formed by round tubes 2, is shown in simplified form. With their cavities, the node pieces 1 and the round tubes 2 form a communicating fluid system.
  • the liquid system is connected via supply lines 3 arranged at the corners of the space framework and return lines 4 located in the center of the space framework to a liquid circuit in which a liquid container 5, a branch valve 6 and a pump 7 are located. Via a bypass line leading from the branch valve 6 to the pump 7, a heat exchanger 8 serving for heating, cooling or solar energy generation can be charged.
  • the pump 7 can in the case of heating via a heating control and in the event of fire via a fire alarm system or a float switch at Wasserver pleasure by opening one of the temperature and pressure-dependent valves in the network. Losses in the liquid system can be supplemented from the local water supply network via an automatic valve 9 controlled by the level of the liquid container 5. Water, to which an anticorrosive and an antifreeze agent has been added, can be used as the liquid.
  • FIG. 2 shows one of the node pieces designated 1 in FIG. 1.
  • FIG. 3 to 6 show the ends of round tubes 2 which have an external thread 10 and which are connected to the node piece 1.
  • the external thread 10 of FIG. 3 is formed by pressing, the external thread 10 of FIG. 4 by upsetting and rolling or by cutting into the previously swaged pipe end.
  • the external thread 10 shown in FIG. 5 is produced by cladding on the end of the round tube 2. 6, the external thread 10 is welded onto the end of the round tube 2 in the form of a helical coil as a profile wire, for. B. by resistance pressure welding.
  • the core diameter di of the external thread 10 is at least as large as the external diameter D of the round tube 2 and the tube cross section is therefore not weakened.
  • a node connection is shown in cross section on a larger scale. From Fig. 7 it can be seen how the end of a round tube 2 provided with an external thread 10 is attached to the node piece 1. On the external thread 10, a (screwable) union nut 11, which can be pushed over the round tube 2, is screwed with an internal thread 12. The union nut 11 with the front section of its internal thread 12 is simultaneously screwed onto an attachment of the node piece 1 which has a corresponding external thread 13. A sealing ring 14 is arranged in the gap between the ends of the round tube 2 and the shoulder of the node piece 1 which has the external thread 13. One of the sealing rings 14 shown in FIG. 7 is designed as a cross-section-restricting throttle for influencing the system flow. A valve 15 is connected to the node piece 1. The valve 15 is used for venting or is designed as an overpressure or overtemperature valve shown in more detail in FIG. 8.
  • FIG. 8 shows another embodiment of the node connection according to the invention, whereby two union nuts 16 and 17 are used.
  • the union nut 16 or 17 is screwed with an external thread 18 or 19 provided on it into the attachment of the node piece 1 having a corresponding internal thread 20 or 21.
  • the internal thread 22 or 23 and the external thread 18 or 19 of the union nut 16 or 17 are arranged with the same pitch and concentrically and along the same longitudinal section of the union nut 16 or 17.
  • a particularly firm connection results from the fact that the round tubes 2 connected to form a knot extend into the knot piece 1.
  • the union nut 16 shown in FIG. 8 is designed as a sleeve with a helical, wavy cross section. It has a radially outwardly projecting ring 24 at its rear ends. The ring 24 presses via an outer sealing ring 25 against the end of the attachment of the knot piece 1 formed with the internal thread 20. In addition, an inner sealing ring 26 seals between the internal thread 22 of the union nut 16 and the round tube 2.
  • the union nut 17 shown above in FIG. 8 is designed as a helical screw. After screwing the union nut 17, which is designed as a helical screw, into the space between the internal thread 21 in the attachment of the node piece 1 and the external thread 10 of the round tube 2, the space between the turns of the union nut 17 is filled by injecting a sealing compound 26.
  • Fig . 9 shows a further exemplary embodiment of a union nut 27, which is designed as a sleeve with a screw spiral 28 cast into it.
  • the helical coil 28 can also be composed of two differently profiled wire halves in cross section.
  • the node pieces 1 are hollow and are formed with openings 30 passing through in the direction of the axes of the round tubes 2 adjoining them.
  • the openings 30 have a diameter which is at least equal to the inner diameter d of the round tubes 2.
  • valve 15 connected to a round tube 2 is shown in more detail.
  • a valve tube 31 is screwed into the round tube 2 and contains a valve body 33 loaded by a compression spring 32.
  • the compression spring 32 presses at the other end onto a fusible link plate 34, which at a correspondingly high temperature clears the way for the compression spring 32 and the valve body 33, so that water can flow out through the valve tube 31.
  • the valve tube 31 also has side openings 35 through which the water can escape not only when the plate 34 melts, but also when the pressure in the liquid system takes on such a high value that the valve body 33 counteracts the force of the compression spring 32 is pressed up to the openings 35.
  • a throttle 36 orifice which narrows in cross section and is inserted into the round tube 2 replaces the sealing ring 14 of FIG. 7, which acts as a throttle.
  • the node connection according to the invention can be used for all types of frameworks, in particular for spatial frameworks, multi-chord truss girders, truss girders, barrels and trusses, single-layer and multilayer truss domes, framework trusses, bar grate and surface structures.

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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)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Bridges Or Land Bridges (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

1. Joint connection for frameworks, especially of steel constructions with more than two rods, which are formed as round tubes (2) and are connected together in a joint by means of screw connections arranged on the tube axes, wherein the ends of the round tubes (2) converging to a joint have an external thread (10) and are fixed to a joint piece (1) by means of sleeve nuts (11) on projections of the joint piece (1) with external threads (13), characterized in that the root diameter (d1 ) of the external threads (10) provided at the ends of the round tubes (2) is at least as large as the outer diameter (D) of the round tubes (2), in that the cross-sectional surface and the bending stiffness of the round tubes (2) in the region of the external threads (10) of the same is at least as large as in the remaining part of the round tubes (2), in that the clear width of the sleeve nuts (11) is at least as large as the outer diameter (D) of the round tubes (2), so that they are slidable over or rotatable on the round tube (2), and in that the length of the thread (12) of the sleeve nut (11) is substantially equal to the sum of the lengths of the external threads (13; 10) on the projections and on the ends of the round tubes (2).

Description

Die Erfindung betrifft eine Knotenverbindung für Stabwerke nach den einleitenden Teilen der unabhängigen Ansprüche 1 und 8. Die Erfindung betrifft auch ein Stabwerk, das mit dem Knotenverbindungen hergestellt ist.The invention relates to a node connection for bar structures according to the introductory parts of independent claims 1 and 8. The invention also relates to a bar structure which is produced with the node connections.

Bekannte derartige Knotenverbindungen haben den Vorteil, daß die Stäbe die Zug- und Druckkräfte ausschließlich mathematisch genau in die Mitte der Knotenstücke einleiten. Hierbei enden die als Stäbe dienenden Rundrohre an aufgeschweißten Kegelstümpfen mit einer axialen Bohrung. Durch die Bohrung ragt ein Schraubenbolzen nach außen, der sich mit seinem Kopf im Rohrinneren am Kegelstumpf abstützt und mit seinem am vorderen Ende angeordneten Gewinde in eine Bohrung eines aus Vollmaterial bestehenden Knotenstückes eingeschraubt werden kann. Zwischen dem Kegelstumpf und dem Knotenstück ist ein Rohr- bzw. Muffenteil angeordnet, durch den der Schraubenbolzen mit seinem Schaft hindurchgeht. Der Muffenteil ist mit dem Schaft des Bolzens derart verbunden, daß der Schaft im Muffenteil gleiten, sich jedoch gegenüber diesem nicht verdrehen kann.Known node connections of this type have the advantage that the rods introduce the tensile and compressive forces only mathematically precisely into the middle of the node pieces. The round tubes serving as rods end on welded truncated cones with an axial bore. A screw bolt protrudes through the bore, which is supported with its head inside the tube on the truncated cone and can be screwed into a bore of a knot piece made of solid material with its thread arranged at the front end. Between the truncated cone and the node piece, a pipe or socket part is arranged, through which the screw bolt with its shaft passes. The sleeve part is connected to the shaft of the bolt in such a way that the shaft slides in the sleeve part, but cannot rotate relative to it.

Durch Verdrehen des Muffenteiles kann der Schraubenbolzen gedreht und somit die Schraubenverbindung zwischen dem Rundrohr und dem Knotenstück hergestellt bzw. gelöst werden.By turning the sleeve part, the screw bolt can be rotated and thus the screw connection between the round pipe and the node piece can be made or loosened.

Die beschriebene Knotenverbindung hat aber viele Nachteile. Sie ist wegen der großen Zahl der zu bearbeitenden Metallteile aufwendig. Die Schweißverbindung zwischen Rundrohr und Kegelstumpf ist eine Schwachstelle und die Festigkeit der Rundrohre kann daher nicht ausgenützt werden. Die hochfesten Schraubenbolzen selbst unterliegen Kerbspannungen und stellen keine starre, sondern gewissermaßen eine gelenkige Verbindung zwischen den Stäben und den Knotenteilen her, da ihre Kernquerschnitte bei Stabknickung als Fließgelenke wirken. Bei der Bemessung der Stäbe muß die volle, bis zum Gewinde am vorderen Ende der Schraubenbolzen reichende Knicklänge in Rechnung gestellt werden. Die Eigensteifigkeit des Stabwerkes ist gering. Zum Einführen der Schraubenbolzen sind in den Rohren Montagelöcher notwendig, die wiederum gegenüberliegende Entwässerungslöcher notwendig machen und somit den Rohrquerschnitt örtlich schwächen. Die Rohrinnenwände sind unkontrollierbar korrosionsgefährdet und ein Schutz der Rohre vor Hitzeeinwirkung im Brandfall ist kaum möglich. Der Feuerwiderstand ist daher insbesondere für den Bau von Hallen, in denen sich Menschen aufhalten oder Flugzeuge abgestellt werden, nicht ausreichend.The node connection described has many disadvantages. It is complex because of the large number of metal parts to be processed. The welded connection between the round tube and the truncated cone is a weak point and the strength of the round tubes cannot therefore be exploited. The high-strength bolts themselves are subject to notch stresses and do not create a rigid, but rather an articulated connection between the bars and the knot parts, since their core cross-sections act as flow joints when the bars are buckled. When dimensioning the rods, the full buckling length up to the thread at the front end of the bolt must be taken into account. The inherent rigidity of the framework is low. To insert the screw bolts, mounting holes are necessary in the pipes, which in turn make opposite drainage holes necessary and thus locally weaken the pipe cross-section. The inner walls of the pipe are uncontrollably at risk of corrosion and it is hardly possible to protect the pipes from the effects of heat in the event of a fire. The fire resistance is therefore not sufficient, in particular for the construction of halls in which people are staying or where planes are parked.

Aus der FR-A-2 317 711 ist eine Knotenver- . bindung der im einleitenden Teil der Ansprüche 1 und 8 genannten Art bekannt. Die an den Enden der Rundrohre vorgesehenen Außengewinde haben einen Kerndurchmesser, der kleiner ist als der Außendurchmesser der Rundrohre. Dadurch ist die Querschnittsfläche und die Biegesteifigkeit im kritischen Anschlußbereich verringert.From FR-A-2 317 711 there is a node connection. Binding known in the introductory part of claims 1 and 8. The external threads provided at the ends of the round tubes have a core diameter that is smaller than the outer diameter of the round tubes. This reduces the cross-sectional area and the bending stiffness in the critical connection area.

Die GB-A-395 931 zeigt ein Konstruktionselement, bei dem die Enden von mit einem Knotenstück verbundenen Stäben miteinander durch stabförmige Spannelemente verbunden sind. Die Spannelemente werden durch Muttern gespannt, die in Kugeln aufgenommen sind und die auf Außengewinde an verdickten Endabschnitten der Spannelemente geschraubt sind.GB-A-395 931 shows a construction element in which the ends of bars connected with a knot are connected to one another by bar-shaped tensioning elements. The tensioning elements are tensioned by nuts which are held in balls and which are screwed onto the external thread on thickened end sections of the tensioning elements.

Der Erfindung liegt die Aufgabe zugrunde, eine biegesteife Knotenverbindung ohne Schwächung der mehr als zwei in einem Knoten verbundenen Stäbe und ohne die erwähnten Nachteile und mit einem geringeren Aufwand der Herstellung bereitzustellen.The invention has for its object to provide a rigid node connection without weakening the more than two rods connected in a node and without the disadvantages mentioned and with less manufacturing effort.

Die Erfindung besteht bei einer Knotenverbindung der eingangs genannten Art darin, daß der Kerndurchmesser der an den Enden der Rundrohre vorgesehenen Außengewinde wenigstens gleich groß ist wie der Außendurchmesser der Rundrohre, daß die Querschnittsfläche und die Biegesteifigkeit der Rundrohre im Bereich der Außengewinde derselben wenigstens gleich groß ist wie im übrigen Teil der Rundrohre, daß die lichte Weite der Überwurfmuttern wenigstens gleich groß ist wie der Außendurchmesser der Rundrohre, so daß diese über das Rundrohr schiebbar bzw. drehbar sind, und daß die Länge des Gewindes der Überwurfmuttern im wesentlichen gleich der Summe der Längen der Außengewinde an den Ansätzen und an den Enden der Rundrohre ist. Es entsteht so ein biegesteifer Anschluß der Rundrohre an den Knotenstücken. Im Übrigen ist eine Füllung der über die Knotenstücke kommunizierend verbundenen Hohlräume der Rundrohre mit Flüssigkeit, z. B. Wasser unter Beimengung von Korrosionsschutz und gegebenenfalls Frostschutzmittel und der Einsatz der Flüssigkeit zum Beheizen, Kühlen und/oder Löschen im Brandfall, Speichern von Solarwärme od. dgi. möglich.The invention consists in a knot connection of the type mentioned above in that the core diameter of the external threads provided at the ends of the round tubes is at least as large as the outer diameter of the round tubes, that the cross-sectional area and the bending stiffness of the round tubes in the area of the external threads are at least the same size as in the remaining part of the round tubes, that the inside diameter of the union nuts is at least as large as the outside diameter of the round tubes, so that they can be pushed or rotated over the round tube, and that the length of the thread of the union nuts is substantially equal to the sum of the lengths the external thread is at the lugs and at the ends of the round tubes. This creates a rigid connection of the round tubes to the node pieces. Incidentally, a filling of the cavities of the round tubes communicating via the node pieces is filled with liquid, e.g. B. water with the addition of corrosion protection and possibly antifreeze and the use of the liquid for heating, cooling and / or extinguishing in the event of fire, storage of solar heat od. Dgi. possible.

Das Anschließen der Rundrohre an das Knotenstück ist einfach, da die auf die Enden der Rundrohre zu schraubenden Überwurfmuttern auf den gewindelosen Teil der Rundrohre geschoben werden können und so das Ausrichten der Rundrohre gegenüber den Ansätzen der Knotenstücke nicht behindern.It is easy to connect the round tubes to the knot piece, since the union nuts to be screwed onto the ends of the round tubes can be pushed onto the unthreaded part of the round tubes and thus do not hinder the alignment of the round tubes with the approaches of the knot pieces.

In einer vorteilhaften Ausführungsform der erfindungsgemäßen Knotenverbindung ist vorgesehen, daß das Knotenstück hohl ausgebildet ist und daß die Ansätze des Knotenstückes eine durchgehende Öffnung aufweisen. So wird die Verbindung zwischen dem Rundrohr und dem Knotenstück nach außen abgedichtet und die Durchströmung des durch die Rundrohre gebildeten Rohrsystems kann beeinflußt werden.In an advantageous embodiment of the knot connection according to the invention it is provided that the knot piece is hollow and that the approaches of the knot piece have a continuous opening. Thus, the connection between the round tube and the node piece is sealed to the outside and the flow through the tube system formed by the round tubes can be influenced.

Wenn die Knotenverbindung für flüssigkeitsgefülfte Stabwerke verwendet wird, kann vorgesehen sein, daß zwischen dem das Außengewinde aufweisenden Ende des Rundrohres und dem Ende des das Außengewinde aufweisenden Ansatzes des Knotenstückes ein gebenenfalls als querschnittsverengende Drossel (Blende) wirkender Dichtungsring angeordnet ist. Die Öffnungen in den Ansätzen der Knotenstücke haben mit Vorteil einen Durchmesser, der mindestens gleich groß ist wie der Innendurchmesser der Rundrohre.If the knot connection is used for liquid-filled rod structures, it can be provided that between the end of the round tube, which has the external thread, and the end of the neck, which has the external thread, of the node piece, a sealing ring which may act as a cross-section-reducing throttle (orifice) is arranged. The openings in the approaches of the knot pieces have with The advantage is a diameter that is at least as large as the inside diameter of the round tubes.

Die Außengewinde an den Enden der Rundrohre können durch plastische Verformung, z. B. Pressen, Stauchen und/oder Rollen, angeformt sein.The external threads at the ends of the round tubes can be deformed by plastic deformation, e.g. B. pressing, upsetting and / or rolling.

Das Außengewinde kann aber auch in die durch Aufstauchen verdickten Enden der Rundrohre eingeschnitten sein.The external thread can, however, also be cut into the ends of the round tubes which are thickened by upsetting.

Es ist auch möglich, das Außengewinde an den Enden der Rundrohre durch Schweißen, z. B. Auftragschweißen oder Widerstandspreßschweißen eines schraubenförmigen Profildraht-stückes zu befestigen.It is also possible to screw the external thread at the ends of the round tubes, e.g. B. surfacing or resistance pressure welding of a helical profile wire piece to attach.

Bei einer anderen, sehr vorteilhaften Ausführungsform der erfindungsgemäßen Knotenverbindung ist vorgesehen, daß der Kerndurchmesser der an den Enden der Rundrohre vorgesehenen Außengewinde wenigstens gleich groß ist wie der Außendurchmesser der Rundrohre, daß die Querschnittsfläche und die Biegesteifigkeit der Rundrohre im Bereich der Außengewinde derselben wenigstens gleich groß ist wie im übrigen Teil der Rundrohre, daß die Überwurfmuttern mit an ihnen vorgesehenen Außengewinden in das Innengewinde des Ansatzes des Knotenstückes eingeschraubt und die Rundrohre in Innengewinde, die in den Überwurfmuttern vorgesehen sind, geschraubt sind, und daß das Innengewinde und das Außengewinde der Mutter die gleiche Steigung aufweisen und zueinander konzentrisch angeordnet sind und daß die Außengewinde an den Enden der Rundrohre, die Gewinde der Überwurfmuttern und die Gewinde in den Ansätzen im wesentlichen gleich lang sind. Diese Ausführungsform wird zusammengebaut, indem die Enden der Rundrohre, auf deren gewindelosen Abschnitt die Überwurfmuttern angeordnet sind, nacheinander in die entsprechenden Ansätze von zwei durch das Rundrohr zu verbindenen Knotenstücke eingeführt werden. Dann werden die Überwurfmuttern auf das Außengewinde der Rundrohre und in die Innengewinde der Ansätze geschraubt.In another, very advantageous embodiment of the knot connection according to the invention it is provided that the core diameter of the external threads provided at the ends of the round tubes is at least as large as the outer diameter of the round tubes, that the cross-sectional area and the bending stiffness of the round tubes in the area of the external threads are at least the same size is, as in the rest of the round tubes, that the union nuts with the external threads provided on them are screwed into the internal thread of the attachment of the node piece and the round tubes are screwed into the internal thread provided in the union nuts, and that the internal thread and the external thread of the nut die have the same pitch and are arranged concentrically to each other and that the external threads at the ends of the round tubes, the threads of the union nuts and the threads in the approaches are essentially of the same length. This embodiment is assembled by successively inserting the ends of the round tubes, on the threadless section of which the union nuts are arranged, into the corresponding approaches of two knot pieces to be connected by the round tube. Then the union nuts are screwed onto the external thread of the round tubes and into the internal thread of the lugs.

In einer anderen Ausführungsform ist vorgesehen, daß das Innengewinde und das Außengewinde der Überwurfmuttern im selben Längsabschnitt derselben angeordnet sind und daß die Rundrohre bis in das Knotenstück hineinreichen.In another embodiment it is provided that the internal thread and the external thread of the union nuts are arranged in the same longitudinal section thereof and that the round tubes extend into the knot piece.

Bewährt hat sich eine Ausführung der Überwurfmuttern, die dadurch gekennzeichnet ist, daß die Überwurfmuttern als Hülsen mit schraubenförmig verlaufendem, wellenförmigem Querschnitt ausgebildet sind.An embodiment of the union nuts has proven itself, which is characterized in that the union nuts are designed as sleeves with a helical, wavy cross section.

In einer Ausführungsform ist vorgesehen, daß die als Hülsen ausgebildeten Überwurfmuttern an einem Ende einen nach außen vorstehenden Ring aufweisen, der über einen äußeren Dichtring gegen die Endfläche des Ansatzes des Knotenstücks anliegt, und daß zwischen dem Innengewinde der Überwurfmuttern und den Rundrohren ein innerer Dichtring angeordnet ist. Auf diese Weise wird im fall der Verwendung der Knotenverbindung für ein flüssigkeitsgefülftes Stabwerk eine dichte Verbindung zwischen dem Ansatz des Knotenstückes und dem Rundrohr erreicht.In one embodiment it is provided that the union nuts designed as sleeves have at one end an outwardly projecting ring which lies against the end face of the attachment of the node piece via an outer sealing ring, and that an inner sealing ring is arranged between the internal thread of the union nuts and the round tubes is. In this way, if the knot connection is used for a liquid-filled rod structure, a tight connection between the attachment of the knot piece and the round tube is achieved.

In einer anderen Ausführungsform ist vorgesehen, daß daß die Überwurfmuttern als Schraubenwendel ausgebildet sind, wobei der Zwischenraum zwischen den Schraubenwindungen in dem Bereich, in dem das Rundrohr in das KnotensWck reicht, durch eine Dichtungsmasse gefüllt ist. Auch hier wird eine abgedichtete Verbindung zwischen dem Knotenstück und dem Rundrohr erzielt.In another embodiment it is provided that the union nuts are designed as a screw helix, the space between the screw turns in the area in which the round tube extends into the knot wrench being filled with a sealing compound. Here too, a sealed connection between the node piece and the round tube is achieved.

Die Überwurfmuttern können auch als Hülsen mit in diese eingelassener, z. B. eingegossener Schraubenwendel ausgebildet sein. Dabei kann die Schraubenwendel im Querschnitt auch aus zwei verschieden profilierten Drahthälften zusammengesetzt sein.The union nuts can also be used as sleeves with recesses, e.g. B. cast helix. The helix can also be composed of two differently profiled wire halves in cross section.

Ein Stabwerk mit erfindungsgemäßen Knotenverbindungen nach den Ansprüchen 1 bis 7 oder 8 bis 13 ist vorteilhaft über die Knotenstücke kommunizierend mit einer Flüssigkeit, z. B. Wasser, gefülft und an einen Flüssigkeitskreislauf angeschlossen.A framework with node connections according to the invention according to claims 1 to 7 or 8 to 13 is advantageously communicating via the node pieces with a liquid, for. B. water, filled and connected to a liquid circuit.

Die Knotenstücke und/oder die Rundrohre können dabei mit einem Ventil ausgerüstet sein, welches durch Überdruck und/oder Ubertemperatur öffnet. So kann im Brandfall ähnlich wie bei einem Sprinklersystem der Brandherd und das Stabwerk mit Wasser besprüht werden. Weiters wird durch die dabei entstehende Strömung im Rohr die Rohrwand gekühlt.The node pieces and / or the round tubes can be equipped with a valve that opens due to excess pressure and / or excess temperature. In the event of a fire, the source of the fire and the framework can be sprayed with water, similar to a sprinkler system. Furthermore, the pipe wall is cooled by the resulting flow in the pipe.

Die Erfindung wird an Hand von in der Zeichnung dargestellten Ausführungsbeispielen erfindungsgemäßer Knotenverbindungen bzw. eines damit hergestellten Stabwerkes näher erläutert.The invention is explained in more detail on the basis of exemplary embodiments of node connections according to the invention shown in the drawing or of a rod structure produced therewith.

Es zeigt Fig.1 ein Stabwerk in Schrägansicht von oben, Fig. 2 ein Knotenstück in vereinfachter Darstellung, Fig. 3 bis 6 verschiedene Ausführungsformen von an das Knotenstück nach Fig. 2 anschließenden Enden von Rundrohren, Fig. 7 eine Knotenverbindung im Querschnitt, Fig. 8 eine andere Ausführungsform einer Knotenverbindung im Querschnitt und Fig. 9 eine Ausführungsform einer Überwurfmutter für die Knotenverbindung nach Fig. 8.1 shows a rod structure in an oblique view from above, FIG. 2 shows a knot piece in a simplified representation, FIG. 3 to 6 shows different embodiments of ends of round tubes adjoining the knot piece according to FIG. 2, FIG. 7 shows a knot connection in cross section, 8 shows another embodiment of a knot connection in cross section, and FIG. 9 shows an embodiment of a union nut for the knot connection according to FIG.

In Fig. 1 ist ein Stabwerk in Form eines typischen zweilagigen Raumfachwerkes, das aus Knotenstücken 1 und aus von Rundrohren 2 gebildeten Stäben besteht, vereinfacht dargestellt. Die Knotenstücke 1 und die Rundrohre 2 bilden mit ihren Hohlräumen ein kommunizierendes Flüssigkeitssystem. Das Flüssigkeitsystem ist über an den Ecken des Raumfachwerks angeordnete Vorlaufleitungen 3 und in der Mitte des Raumfachwerks befindliche Rücklaufleitungen 4 an einen Flüssigkeitskreislauf angeschlossen, in dem ein Flüssickeitsbehäfter 5, ein Zweigventil 6 und eine Pumpe 7 liegen. Über eine vom Zweigventil 6 zur Pumpe 7 führende Bypassleitung kann ein zur Heizung, Kühlung oder Solarenergiegewinnung dienender Wärmetauscher 8 beaufschlagt werden. Die Pumpe 7 kann im Fall der Beheizung über eine Heizungssteuerung und im Brandfall über eine Brandmeldeanlage oder durch einen Schwimmerschalter bei Wasserverlust dürch Öffnen eines der temperatur- und druckabhängigen Ventile im Netz in Betrieb gesetzt werden. Verluste im Flüssigkeitssystem können aus dem Wasserleitungs-Ortsnetz über ein automatisches, vom Niveau des Flüssigkeitsbehälters 5 gesteuertes Ventil 9 ergänzt werden. Als Flüssigkeit kann Wasser, dem ein Korrosionsschutz- und ein Frostschutzmittel zugesetzt ist, verwendet werden.In Fig. 1, a rod structure in the form of a typical two-layer space framework, which consists of node pieces 1 and rods formed by round tubes 2, is shown in simplified form. With their cavities, the node pieces 1 and the round tubes 2 form a communicating fluid system. The liquid system is connected via supply lines 3 arranged at the corners of the space framework and return lines 4 located in the center of the space framework to a liquid circuit in which a liquid container 5, a branch valve 6 and a pump 7 are located. Via a bypass line leading from the branch valve 6 to the pump 7, a heat exchanger 8 serving for heating, cooling or solar energy generation can be charged. The pump 7 can in the case of heating via a heating control and in the event of fire via a fire alarm system or a float switch at Wasserver pleasure by opening one of the temperature and pressure-dependent valves in the network. Losses in the liquid system can be supplemented from the local water supply network via an automatic valve 9 controlled by the level of the liquid container 5. Water, to which an anticorrosive and an antifreeze agent has been added, can be used as the liquid.

Fig. 2 zeigt eines der in Fig. 1 mit 1 bezeichneten Knotenstücke.FIG. 2 shows one of the node pieces designated 1 in FIG. 1.

Die Fig. 3 bis 6 zeigen die mit dem Knotenstück 1 verbundenen Enden von Rundrohren 2, die ein Außengewinde 10 aufweisen. Das Außengewinde 10 der Fig. 3 ist durch Pressen, das Außengewinde 10 der Fig. 4 durch Stauchen und Rollen oder durch Einschneiden in das vorher aufgestauchte Rohrende angeformt. Das in Fig. 5 gezeigte Außengewinde 10 ist durch Auftragschweißen auf dem Ende des Rundrohres 2 hergestellt. Gemäß Fig. 6 ist das Außengewinde 10 auf das Ende des Rundrohres 2 in form einer Schraubenwendel als Profildraht aufgeschweißt, z. B. durch Widerstandspreßschweißen. In allen Fällen ist der Kerndurchmesser di des Außengewindes 10 mindestens gleich groß wie der Außendurchmesser D des Rundrohres 2 und der Rohrquerschnitt somit nicht geschwächt.3 to 6 show the ends of round tubes 2 which have an external thread 10 and which are connected to the node piece 1. The external thread 10 of FIG. 3 is formed by pressing, the external thread 10 of FIG. 4 by upsetting and rolling or by cutting into the previously swaged pipe end. The external thread 10 shown in FIG. 5 is produced by cladding on the end of the round tube 2. 6, the external thread 10 is welded onto the end of the round tube 2 in the form of a helical coil as a profile wire, for. B. by resistance pressure welding. In all cases, the core diameter di of the external thread 10 is at least as large as the external diameter D of the round tube 2 and the tube cross section is therefore not weakened.

In Fig. 7 ist in größerem Maßstab eine Knotenverbindung im Querschnitt gezeigt. Aus Fig. 7 ist ersichtlich, wie das mit einem Außengewinde 10 versehene Ende eines Rundrohres 2 am Knotenstück 1 befestigt ist. Auf das Außengewinde 10 ist eine, über das Rundrohr 2 schiebbare (schraubbare) Überwurfmutter 11 mit einem Innengewinde 12 geschraubt. Dabei ist die Überwurfmutter 11 mit dem vorderen Abschnitt ihres Innengewindes 12 gleichzeitig auf einen ein entsprechendes Außengewinde 13 aufweisenden Ansatz des Knotenstückes 1 geschraubt. Im Spalt zwischen den Enden des Rundrohres 2 und dem das Außengewinde 13 aufweisenden Ansatz des Knotenstückes 1 ist ein Dichtungsring 14 angeordnet. Einer der in Fig. 7 gezeigten Dichtungsringe 14 ist als querschnittsverengende Drossel zur Beeinflussung der Systemdurchströmung ausgebildet. An das Knotenstück 1 ist ein Ventil 15 angeschlossen. Das Ventil 15 dient der Entlüftung oder ist als in Fig. 8 genauer dargestelltes Überdruck- bzw. Übertemperaturventil ausgebildet.In Fig. 7, a node connection is shown in cross section on a larger scale. From Fig. 7 it can be seen how the end of a round tube 2 provided with an external thread 10 is attached to the node piece 1. On the external thread 10, a (screwable) union nut 11, which can be pushed over the round tube 2, is screwed with an internal thread 12. The union nut 11 with the front section of its internal thread 12 is simultaneously screwed onto an attachment of the node piece 1 which has a corresponding external thread 13. A sealing ring 14 is arranged in the gap between the ends of the round tube 2 and the shoulder of the node piece 1 which has the external thread 13. One of the sealing rings 14 shown in FIG. 7 is designed as a cross-section-restricting throttle for influencing the system flow. A valve 15 is connected to the node piece 1. The valve 15 is used for venting or is designed as an overpressure or overtemperature valve shown in more detail in FIG. 8.

Fig. 8 zeigt eine andere Ausführungsform der erfindungsgemäßen Knotenverbindung, wobei zweierlei Überwurfmuttern 16 bzw. 17 Anwendung finden. In beiden Fällen ist die Überwurfmutter 16 bzw. 17 mit einem an ihr vorgesehenen Außengewinde 18 bzw. 19 in den ein entsprechendes Innengewinde 20 bzw. 21 aufweisenden Ansatz des Knotenstückes 1 geschraubt. Das Innengewinde 22 bzw. 23 und das Außengewinde 18 bzw. 19 der Überwurfmutter 16 bzw. 17 sind mit gleicher Steigung sowie konzentrisch und entlang deren selben Längsabschnittes der Überwurfmutter 16 bzw. 17 angeordnet. Eine besonders feste Verbindung ergibt sich dadurch, daß die zu einem Knoten verbundenen Rundrohre 2 bis in das Knotenstück 1 hineinreichen.FIG. 8 shows another embodiment of the node connection according to the invention, whereby two union nuts 16 and 17 are used. In both cases, the union nut 16 or 17 is screwed with an external thread 18 or 19 provided on it into the attachment of the node piece 1 having a corresponding internal thread 20 or 21. The internal thread 22 or 23 and the external thread 18 or 19 of the union nut 16 or 17 are arranged with the same pitch and concentrically and along the same longitudinal section of the union nut 16 or 17. A particularly firm connection results from the fact that the round tubes 2 connected to form a knot extend into the knot piece 1.

Die in Fig. 8 gezeigte Überwurfmutter 16 ist als Hülse mit schraubenförmig verlaufendem, wellenförmigem Querschnitt ausgebildet. Sie weist an ihrem hinteren Enden einen radial nach außen vorstehenden Ring 24 auf. Der Ring 24 drückt über einen äußeren Dichtring 25 gegen das Ende des mit dem Innengewinde 20 ausgebildeten Ansatzes des Knotenstückes 1. Außerdem dichtet ein innerer Dichtring 26 zwischen dem Innengewinde 22 der Überwurfmutter 16 und dem Rundrohr 2 ab.The union nut 16 shown in FIG. 8 is designed as a sleeve with a helical, wavy cross section. It has a radially outwardly projecting ring 24 at its rear ends. The ring 24 presses via an outer sealing ring 25 against the end of the attachment of the knot piece 1 formed with the internal thread 20. In addition, an inner sealing ring 26 seals between the internal thread 22 of the union nut 16 and the round tube 2.

Die in Fig. 8 oben gezeigte Überwurfmutter 17 ist als Schraubenwendel ausgebildet. Nach dem Einschrauben der als Schraubenwendel ausgebildeten Überwurfmutter 17 in den Zwischenraum zwischen dem Innengewinde 21 im Ansatz des Knotenstückes 1 und dem Außengewinde 10 des Rundrohres 2 wird der Zwischenraum zwischen den Windungen der Überwurfmutter 17 durch Einspritzen einer Dichtungsmasse 26 gefüllt.The union nut 17 shown above in FIG. 8 is designed as a helical screw. After screwing the union nut 17, which is designed as a helical screw, into the space between the internal thread 21 in the attachment of the node piece 1 and the external thread 10 of the round tube 2, the space between the turns of the union nut 17 is filled by injecting a sealing compound 26.

Fig. 9 zeigt ein weiteres Ausführungsbeispiel einer Überwurfmutter 27, wobei diese als Hülse mit einer in dieser eingegossenen Schraubenwendel 28 ausgebildet ist. Dabei kann die Schraubenwendel 28 im Querschnitt auch aus zwei verschieden profilierten Drahthälften zusammengesetzt sein.Fig . 9 shows a further exemplary embodiment of a union nut 27, which is designed as a sleeve with a screw spiral 28 cast into it. The helical coil 28 can also be composed of two differently profiled wire halves in cross section.

Bei den Knotenverbindungen der Fig. 7 und 8 sind die Knotenstücke 1 hohl und mit in Richtung der Achsen der an sie anschließenden Rundrohre 2 durchgehenden Öffnungen 30 ausgebildet. Die Öffnungen 30 haben einen Durchmesser, der mindestens gleich dem Innendurchmesser d der Rundrohre 2 ist.7 and 8, the node pieces 1 are hollow and are formed with openings 30 passing through in the direction of the axes of the round tubes 2 adjoining them. The openings 30 have a diameter which is at least equal to the inner diameter d of the round tubes 2.

In Fig. 8 ist das an ein Rundrohr 2 angeschlossene Ventil 15 näher dargestellt. In das Rundrohr 2 ist ein Ventilrohr 31 eingeschraubt, in dem sich ein durch eine Druckfeder 32 belasteter Ventilkörper 33 befindet. Die Druckfeder 32 drückt am anderen Ende auf ein Schmelzlotplättchen 34, das bei einer entsprechend hohen Temperatur den Weg für die Druckfeder 32 und den Ventilkörper 33 freigibt, so daß Wasser durch das Ventilrohr 31 ausströmen kann. Das Ventilrohr 31 hat außerdem seitliche Öffnungen 35, durch die das Wasser nicht nur im Fall des Schmelzens des Plättchens 34, sondern auch dann austreten kann, wenn der Druck im Flüssigkeftssystem einen so hohen Wert annimmt, daß der Ventilkörper 33 gegen die Kraft der Druckfeder 32 bis zu den Öffnungen 35 gedrückt wird. Eine in das Rundrohr 2 eingesetzte, querschnittsverengende Drossel 36 (Blende) ersetzt bei dieser Ausführungsform den als Drossel wirkenden Dichtungsring 14 der Fig. 7.In Fig. 8, the valve 15 connected to a round tube 2 is shown in more detail. A valve tube 31 is screwed into the round tube 2 and contains a valve body 33 loaded by a compression spring 32. The compression spring 32 presses at the other end onto a fusible link plate 34, which at a correspondingly high temperature clears the way for the compression spring 32 and the valve body 33, so that water can flow out through the valve tube 31. The valve tube 31 also has side openings 35 through which the water can escape not only when the plate 34 melts, but also when the pressure in the liquid system takes on such a high value that the valve body 33 counteracts the force of the compression spring 32 is pressed up to the openings 35. In this embodiment, a throttle 36 (orifice) which narrows in cross section and is inserted into the round tube 2 replaces the sealing ring 14 of FIG. 7, which acts as a throttle.

Die erfindungsgemäße Knotenverbindung ist für Stabwerke aller Art, insbesondere für räumliche Stabwerke, mehrgurtige Fachwerksträger, Fachwerksscheiben, -tonnen und -faftwerke, ein-und mehrlagige Fachwerkskuppeln, Stabwerkskuppeln, Stabrost- und Flächentragwerke einsetzbar.The node connection according to the invention can be used for all types of frameworks, in particular for spatial frameworks, multi-chord truss girders, truss girders, barrels and trusses, single-layer and multilayer truss domes, framework trusses, bar grate and surface structures.

Claims (15)

1. Joint connection for frameworks, especially of steel constructions with more than two rods, which are formed as round tubes (2) and are connected together in a joint by means of screw connections arranged on the tube axes, wherein the ends of the round tubes (2) converging to a joint have an external thread (10) and are fixed to a joint piece (1) by means of sleeve nuts (11) on projections of the joint piece (1) with external threads (13), characterized in that the root diameter (di) of the external threads (10) provided at the ends of the round tubes (2) is at least as large as the outer diameter (D) of the round tubes (2), in that the cross-sectional surface and the bending stiffness of the round tubes (2) in the region of the external threads (10) of the same is at least as large as in the remaining part of the round tubes (2), in that the clear width of the sleeve nuts (11) is at least as large as the outer diameter (D) of the round tubes (2), so that they are slidable over or rotatable on the round tube (2), and in that the length of the thread (12) of the sleeve nut (11) is substantially equal to the sum of the lengths of the external threads (13; 10) on the projections and on the ends of the round tubes (2).
2. Joint connection according to claim 1, characterized in that the joint piece (1) is formed hollow and in that the projections of the joint piece (1) have a through opening (30).
3. Joint connection according to claim 2, characterized in that a sealing ring (14), if desired acting as a cross-section reducing throttle (stop), is arranged between the end of the round tube (2) with the external thread (10) and the end of the projection of the joint piece (1) with the external thread (13).
4. Joint connection according to claim 2 or 3, characterized in that the openings (30) in the projections of the joint piece (1) have a diameter which is at least as large as the inner diameter (d) of the round tubes (2).
5. Joint connection according to one of claims 1 to 4, characterized in that the external threads (10) on the ends of the round tubes (2) is formed by plastic deformation, e.g. pressing, upsetting and/or rolling.
6. Joint connection according to one of claims 1 to 4, characterized in that the external threads (10) are cut in the ends of the round tubes (2) thickened by upsetting.
7. Joint connection according to one of claims 1 to 4, characterized in that the external threads (10) on the ends of the round tubes (2) are fixed on by welding, e.g. build-up welding or resistance welding of a helical profiled wire piece.
8. Joint connection for frameworks, especially of steel constructions, with more than two rods, which are formed as round tubes (2) and are connected together in a joint by means of screw connections arranged on the tube axes, wherein the ends of the round tubes (2) converging to a joint have an external thread (10) and are fixed to a joint piece (1) by means of sleeve nuts (16, 17, 27) on a projection of the joint piece (1) with threads (20, 21), characterized in that the root diameter (di) of the external threads (10; provided at the ends of the round tubes (2) is at least as large as the outer diameter (D) of the round tubes (2), in that the cross-sectional surface and the bending stiffness of the round tubes (2) in the region of the external threads (10) of the same is at least as large as in the remaining part of the round tubes (2), in that the sleeve nuts (16, 17, 27) are screwed into the internal thread (20, 21) of the projection of the joint piece (1) through external threads (18, 19) provided thereon and the round tubes (2) are screwed into internal threads (22, 23) which are provided in the sleeve nuts (16, 17, 27), in that internal threads (22, 23) and the external threads (18, 19) of the nuts (16, 17, 27) have the same pitch and are arranged concentric with one another and in that the external threads (10) on the ends of the round tubes (2), the threads (22, 23, 18, 19) of the sleeve nuts (16, 17, 27) and the threads (20, 21) in the projections are substantially the same length.
9. Joint connection according to claim 8, characterized in that the internal thread (22, 23) and the external thread (18, 19) of the sleeve nuts (16, 17, 27) are arranged in the same longitudinal section of the same and in that the round tubes (2) extend into the joint piece (1).
10. Joint connection according to claim 8 or 9, characterized in that the sleeve nuts (16) are formed as a sleeves with a waveformed cross-section running in screw form.
11. Joint connection according to claim 10, characterized in that the sleeve nuts (16) formed as a sleeves has an outwardly projecting ring (24) at one end, which bears through an outer sealing ring (25) against the end surface of the projection of the joint piece (1), and in that an inner sealing ring (26) is arranged between the internal thread (22) of the sleeve nuts (16) and the round tubes (2).
12. Joint connection according to claim 8 or 9, characterized in that the sleeve (17) are formed as a screw coil, wherein the space between the screw turns is filled with a sealing mass (26) in the region in which the round tube (2) extends into the joint piece (1).
13. Joint connection according to claim 8 or 9, characterized in that the sleeve nuts (27) are formed as a sleeve with a screw coil incorporated therein, e. g. cast in.
14. Framework with joint connections according to one of claims 1 to 7 or one of claims 8 to 13, characterized in that it is filled with a fluid, e. g. water, communicating via the joint piece (1) and is connected to a fluid circuit.
15. Framework according to claim 14, characterized in that the joint pieces (1) and/or the round tubes (2) are equipped with a valve (15), which opens under excess pressure and/or excess temperature.
EP84111614A 1983-10-10 1984-09-28 Assembling knot for a three-dimensional framework, and three-dimensional framework comprising such a knot Expired - Lifetime EP0137429B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3605/83 1983-10-10
AT0360583A AT379190B (en) 1983-10-10 1983-10-10 NODE CONNECTION FOR RODWORKS AND RODWORK WITH SUCH NODE CONNECTIONS

Publications (3)

Publication Number Publication Date
EP0137429A2 EP0137429A2 (en) 1985-04-17
EP0137429A3 EP0137429A3 (en) 1987-03-11
EP0137429B1 true EP0137429B1 (en) 1990-03-21

Family

ID=3552831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111614A Expired - Lifetime EP0137429B1 (en) 1983-10-10 1984-09-28 Assembling knot for a three-dimensional framework, and three-dimensional framework comprising such a knot

Country Status (6)

Country Link
EP (1) EP0137429B1 (en)
JP (1) JPS60238548A (en)
AT (2) AT379190B (en)
CA (1) CA1251321A (en)
DE (1) DE3481721D1 (en)
ZA (1) ZA847862B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199865B (en) * 1985-08-16 1989-09-06 Garry Randall Hart Adjustable space frames
DE3629135A1 (en) * 1986-08-27 1988-03-10 Grimm Friedrich Bjoern NODE ROD SYSTEM
DE4228238C2 (en) * 1992-08-25 1996-08-14 Ges Innenhochdruckverfahren Truss with hollow parts, process for its production and its use
CN103184768A (en) * 2013-01-22 2013-07-03 北京工业大学 Screw thread sleeve joint for detachable grid structure
CN103898991A (en) * 2014-04-10 2014-07-02 北京工业大学 Sleeve-type pipe node
CN107953059B (en) * 2018-01-04 2024-05-07 中建二局安装工程有限公司 Intersecting line rod piece angle adjusting device and pipe truss embedded rod piece construction method
CN113404164A (en) * 2021-06-30 2021-09-17 郑州宝冶钢结构有限公司 Method for installing steel pipe truss through pipe fitting through sleeve
CN113788164B (en) * 2021-09-14 2022-09-02 哈尔滨理工大学 Space truss connecting device with bidirectional locking function
CN113914460A (en) * 2021-09-28 2022-01-11 山东经典建筑研究院有限公司 Large-span repairable assembly type node and assembly method
CN115853119B (en) * 2022-12-17 2023-07-28 杭州旭翔实业有限公司 Prefabricated assembled light steel structure factory building

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB395931A (en) * 1932-11-30 1933-07-27 Alexander Herman A metal frame-unit for constructional purposes
US2578364A (en) * 1945-03-28 1951-12-11 Jr Glenway Maxon Hinged tubular joint
FR1009812A (en) * 1948-06-28 1952-06-04 Coupling device without screws for structural metal parts
DE850946C (en) * 1948-11-16 1953-01-29 Kurt Thomas Nodal formation of lattice structures
DE2428524C3 (en) * 1974-06-13 1979-05-03 Mannesmannroehren-Werke Ag, 4000 Duesseldorf Spatial framework
FR2317717A1 (en) * 1975-07-11 1977-02-04 Menabe Edme Multielement frame assembly mechanical joint - has several tubular screwed arms which can be used to terminate tubes of frame

Also Published As

Publication number Publication date
CA1251321A (en) 1989-03-21
AT379190B (en) 1985-11-25
EP0137429A2 (en) 1985-04-17
DE3481721D1 (en) 1990-04-26
ATA360583A (en) 1985-04-15
ATE51260T1 (en) 1990-04-15
ZA847862B (en) 1985-06-26
EP0137429A3 (en) 1987-03-11
JPS60238548A (en) 1985-11-27

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