EP4108844B1 - Système de construction et connecteur correspondant - Google Patents

Système de construction et connecteur correspondant Download PDF

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Publication number
EP4108844B1
EP4108844B1 EP22179433.2A EP22179433A EP4108844B1 EP 4108844 B1 EP4108844 B1 EP 4108844B1 EP 22179433 A EP22179433 A EP 22179433A EP 4108844 B1 EP4108844 B1 EP 4108844B1
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EP
European Patent Office
Prior art keywords
connector
plates
plug
key
leaves
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.)
Active
Application number
EP22179433.2A
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German (de)
English (en)
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EP4108844A1 (fr
Inventor
Maxime Calderaro
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Individual
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Individual
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Publication date
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Publication of EP4108844A1 publication Critical patent/EP4108844A1/fr
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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
    • E04B1/38—Connections for building structures in general
    • E04B1/61—Connections for building structures in general of slab-shaped building elements with each other
    • E04B1/6108—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together
    • E04B1/612—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces
    • E04B1/6179—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces with protrusions and recesses on each frontal surface
    • 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
    • E04B1/02—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped 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
    • E04B1/38—Connections for building structures in general
    • E04B1/61—Connections for building structures in general of slab-shaped building elements with each other
    • E04B1/6108—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together
    • E04B1/612—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces
    • E04B1/6125—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces with protrusions on the one frontal surface co-operating with recesses in the other frontal surface
    • E04B1/6141—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces with protrusions on the one frontal surface co-operating with recesses in the other frontal surface the connection made by an additional locking key
    • 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
    • E04B1/61—Connections for building structures in general of slab-shaped building elements with each other
    • E04B1/6108—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together
    • E04B1/612—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces
    • E04B1/6145—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces with recesses in both frontal surfaces co-operating with an additional connecting element
    • E04B1/6162—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces with recesses in both frontal surfaces co-operating with an additional connecting element the connection made by an additional locking key
    • 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
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2463—Connections to foundations
    • 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
    • E04B1/2604—Connections specially adapted therefor
    • E04B2001/2664—Connections specially adapted therefor using a removable key
    • 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
    • E04B1/2604—Connections specially adapted therefor
    • E04B2001/268—Connection to foundations

Definitions

  • the present invention relates to the field of structural engineering with embodiments concerning the construction of buildings and homes, in particular the construction of homes including structural wooden elements.
  • the present invention proposes a construction system based on a connector system that is conceived to join a large variety of structural elements.
  • the structural elements themselves may be wooden beams and sheets, or prefabricated panels comprising an assemblage of wooden beam planks, and sheets.
  • the structural elements are more preferably realized of engineered wood, such as plywood, oriented strand board, laminated timber, cross-laminated timber, and the like. These are not essential features of the invention, however, and the construction system disclosed herein can be also applied to other materials, including synthetic, metallic, composite, masonry and concrete materials.
  • DE 23 52 801 A1 and FR 2 874 947 A1 show examples of connectors used for joining structural elements in buildings.
  • the system of the invention is configured to join two or three structural elements in a simple and standard manner, with a minimal employ of tool, and in a reversible fashion.
  • two of the structural elements involved will be side-by-side or in an angled configuration and may be embodied by two vertical panels forming a section of a wall or a corner of the same, while a third element lies above or below the first and second elements, which may be embodied by a beam, a sill or a joist. All these elements are preferably modular and prefabricated, such that the amount of labour on the construction site is reduced.
  • the first and second elements forming wall sections may take the form of closed parallelepiped bodies, with a peripheral frame closed on both sides by rigid panels, or open lattices of studs and braces, to be finished once the framing is complete.
  • the wall sections may include a preinstalled insulating layers and/or channels for plumbing, electrical wiring, air conditioning, heating, ventilation, and so on. Where required, the wall sections will include openings for doors and windows.
  • the first and/or the second structural elements need not be full-height wall sections rising from floor to ceiling. They may be also reduced-height elements such as lintels and other horizontal elements, for example for creating a window or a door.
  • the system of the invention may be used for peripheral walls as well as for internal partitions of a building.
  • the system of the invention comprises, in embodiments, a connector for joining three structural elements having four components: a first and a second components are essentially identical or compatible plates and are configured to be affixed to the aforesaid first and second structural elements, in such a way that the first and second element can be joined side-by-side with the first and second components are sandwiched between the first and second structural element one against the other in a symmetric mirror configuration.
  • the plates constituting the first and second component have a trough open to one side such that, when they are so symmetrically juxtaposed the two troughs meet and leave an opening that is accessible from below or from above and allows the insertion of a third components.
  • the third component is a plug whose outer shape fits in the opening mentioned above and may be essentially cylindrical or prismatic.
  • the plug is configured to be affixed to the aforesaid third structural element.
  • the fourth element of the connector is a flat key that can be inserted through a free space between the first and second structural elements to lock the two plates and the plug together.
  • the plates have each a central leaf that runs parallel and slightly aside the centre axis of the trough and rises orthogonal to the general plane of the plate.
  • the corresponding leaves are adjacent in loose contact, or slightly separated.
  • the leaves have a central opening each for the passage of the key.
  • the plug has slots that are designed to accept the leaves of the two plates, and side openings to allow the passage of the key.
  • the first, second and third elements are freely engageable with one another until the key is inserted.
  • the key is configured with a wedge angle
  • the side openings of the and the central opening in the leaves have internal surfaces disposed along the wedge angle such that the key may be inserted partway with firm hand pressure to achieve a temporary connection, easily undone when needed, or driven home with a hammer to achieve a permanent connection.
  • the key will be entirely below the surface of the first and second structural element and can be hidden completely in the wall finish.
  • the plugs have a bored bottom for affixing to the horizontal structural element below or above by means of a suitable fastener.
  • These fasteners may include anchor bolts for fastening the plug to an underlying concrete foundation, and round-head square-neck bolts to fasten the plug to a joist.
  • the nut lies on the bottom of the plug, and can be tightened from an above aperture of the plug with a socket wrench. In the latter, the nut is normally accessible from the opposite side of the joist.
  • the plugs are not, because their side openings change in consideration of the wedge angle of the key and they must be mounted considering the direction from which the key is inserted. Accordingly, the plugs are preferably keyed and installed in pre-cut sockets on the horizontal structural element fashioned such that only the correct orientation is possible.
  • the key may be held into place by simple friction and may have roughened or textured faces to increase its hold. It may have a hole to insert a hook and extract the key from the assembly by strong pulling, thereby freeing the assembly. Where a stronger, irreversible hold is required, the key may nave notches that engage with corresponding edges in the leaves such that it is positively held in place and is essentially not dismountable.
  • the connector of the invention plates, plugs and keys, can be manufactured in steel simply and economically, for example by punching, bending and welding of sheet metal,
  • the plugs are manufacturable by bending or else by machining of drawn tubes. Other manufacturing processes are possible, however.
  • the steel grade can be chosen to provide connectors of increased resistance, without altering the dimensions.
  • the connector of the invention brings several advantages to the process of home building and can be usefully employed in other domains as well.
  • the standardised connectors can be manufactured economically in large numbers, yet they can be applied to most connections relevant to home building.
  • the structural elements can be equipped with the connectors at the factory, and their dimension and mass are such that they can be transported and moved easily by one or two people, in most cases.
  • the opposed parts of the connectors mate together easily, with simple movement, such that the operation of assembly and erection are simplified.
  • Another advantage of the system of the invention is that the metallic connectors are embedded inside a thick wooden structural element and in this way offer a superior resistance against fire.
  • the plates of the invention 5, 5' are identical and symmetrically arranged when in place.
  • Each plate has a generally flat face and a trough open to the lower end.
  • the trough is divided approximatively in the middle plane by a leaf 3, 3' rising orthogonal to the flat face, but slightly shifted to the side so that, when two plates are joined, the leaves do not interfere and arrange themselves side by side, in loose contact or separated by a slight space.
  • the leaves 3, 3' have a central aperture 33 for the passage of the key 4 , as shown in this drawing and in the following ones.
  • the shape of the plates 5, 5' is preferably such that they can be fabricated with ordinary metal-bending techniques from a flat sheet.
  • the leaves can be advantageously manufactured as separated pieces and welded in the slots foreseen for that purpose.
  • the plug 2 also has side apertures 25, 25' for the passage of the key 4 .
  • the bottom of the key has a bore, as it will be disclosed more clearly in the following, for the passage of a fastener 8 , in this case an anchor bolt for fastening the plug to a concrete foundation.
  • Figure 2 shows one plate 5 fastened to a wall section B1.
  • the fastening is achieved by screws 51 , but other fastening means may be foreseen.
  • the wall section is a solid element and may be prefabricated as a peripheral frame closed on both sides by rigid panels, or as an open lattice including vertical studs and diagonal braces and has preferably the plate 5 permanently pre-installed at the manufacturing site.
  • Engineered wood for example laminated timber for the frame and oriented strand boards for the side panels, is preferred because of its dimensional stability, but other materials can be used.
  • Figure 2 shows a slot in the construction element B1 that allows the insertion of the key 4 into the connector to lock it, as it will be explained later.
  • the key 4 disappears below the surface of the wall section B1 when the connector is locked.
  • the plug 2 is screwed on a sill F2 by an anchor 8 that reaches the underlying concrete foundation.
  • Other fasteners may be used in different situations, of course.
  • the plug lies in a milled recess of the sill F2 and is preferably keyed, as it will be clearer later, to ensure the correct positioning and orientation.
  • the sill F2 is prefabricated with the recesses for lodging the plugs already prepared.
  • the plug 2 is better visible from figure 3 .
  • the body is cylindrical and corresponds to the sections of the troughs in the plates 5 . Nevertheless, this is not an essential feature of the invention and plugs and plates may have prismatic shapes as well. Cylindrical plugs can be manufactured conveniently from section of steel tube.
  • the plug has side openings 25, 25' for the key, and slots 22, 22' leaving a free space for the leaves.
  • the side openings 25, 25' are different to account for the wedge angle of the key and, therefore, the plug must be inserted in a determined orientation to work. This is achieved by the protrusion 27 that engages in a corresponding slot in the horizontal structural element to which the plug is connected.
  • the bottom hole 28 allows the passage of the bolt, which may be a square-neck bolt, tightened from below, or an anchor with a nut contained in the plug, tightened from above.
  • the drawing shows two openings 25, 25' with different dimensions, the opening from which the key is inserted being the larger to account for the increasing height of the key 4 .
  • the openings 25, 25' may be identical and aligned to simplify the manufacturing.
  • Figure 4 is a cross-section of one plate 5 , the plug 2 and the key 4 in position.
  • a symmetrical plate is normally present but has not been drawn to simplify.
  • the key 4 can be inserted by applying a force on the side 47 and extracted by pulling through the hole 43 with a suitable tool. According to the amount of force (hand pressure or tapping with a hammer) the connection may be loose or tight, temporary or permanent.
  • the key acts on the upper edges of the side openings 25, 25' in the plug 2 , and on the lower edge of the centre opening of the leaves 3 .
  • the side opening 25, 25' have an angled upper edge matching the wedge angle between the faces 41 and 42 of the key 4 .
  • the key When the key is driven home it acts by pulling the plates downwards and the plug upward with an opposite force.
  • Figure 5 shows a cross section of the connector.
  • the central openings 33, 33' have a curved edge that interferes with the sides of the key 4 such that the plates 5, 5' are pulled one against the other.
  • the tip of the key 4 has preferably converging surfaces 53, 54 to ease the insertion.
  • Figures 6 and 7 show the action of locking the inventive connector by inserting the key 4 .
  • the wall section B1 rests on the sill F2 loosely, and the adjacent section (not drawn) can move independently.
  • the key 4 is inserted forcefully ( figure 9 )
  • it applies a downward force to the leaves 3 which in turn push down the plates 5 and the wall section B1 against the sill F2 .
  • the wall section B1 is firmly anchored in place and cannot move.
  • the key 4 has features to improve its hold in the connector.
  • the key 4 may have roughened or textured surfaces 49 that increase the friction against the centre openings to the point that accidental disconnection is not possible.
  • the key may have two notches 48, 48' (visible in figure 9 ) that interlock with the curved sides of the centre openings in the leaves.
  • the connector is essentially non-dismountable and cannot be opened without deforming permanently the key or the plates.
  • Figures 10 and 11 show an example of application of the system of the invention with two wall sections that are fixed in position side by side by the connectors of the invention between two horizontal elements F2 .
  • the wall element B1 has two pair of plates according to the invention placed on opposite sides at the lower and upper end.
  • the connector plates at the lower end can be engaged in a connector plate of an adjacent module by a slightly slanted motion, allowing to slide the leaf of one plate in the trough of the corresponding opposite plate.
  • the mating of the connector plates at the upper end is easier because the upper plugs are not in place and can be achieved by a simple vertical sliding movement.
  • the wall sections are dimensioned to be portable and, therefore, a small team of workers can easily erect a whole floor of a house by aligning the required wall section side by side at the positions that are defined by the plugs already in place on the lower horizontal element F2, temporarily stabilizing the construction by inserting the keys 4 in the connector by hand, or by side bracing if necessary, capping the floor with the upper joist F1 where the plugs are already in place, and finally locking all the connectors by tapping the keys in place with a hammer.
  • Figures 12 and 13 show that the construction system of the invention is not limited to full-height wall sections but can accommodate also partial-height elements such as a lintel.
  • the lintel will have only a pair of plates that interact with opposed plates at the upper end of adjacent wall sections. Even if it is not represented in the drawing, the informed readers will understand readily that the construction system of the invention may include other structural elements such as corner posts, with connector plates at right angles, middle posts to start a partition wall, and many more, always using the inventive connector described herein.

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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)

Claims (15)

  1. Connecteur pour un système de construction comprenant deux plaques (5, 5'), chaque plaque (5, 5') ayant une rainure ouverte sur un côté et une feuille centrale (3, 3') s'étendant parallèlement à un axe central de la rainure et décalée par rapport à l'axe central, s'élevant orthogonalement au plan général des plaque de telle sorte que les plaques (5, 5') puissent être jointes symétriquement en sorte que leurs rainures respectives se joignent et laissent une ouverture accessible contenant les feuilles centrales (3, 3') l'une à côté de l'autre, le connecteur comprenant un bouchon (2) insérable dans l'ouverture et une clé plate (4) insérable dans des ouvertures latérales (25, 25') du bouchon (2) et dans des ouvertures centrales (33, 33') des feuilles (3, 3') pour bloquer les plaques (5, 5') et le bouchon (2) dans une liaison rigide.
  2. Connecteur selon la revendication précédente, dans lequel les feuilles (3, 3') sont configurées de telle sorte que, lorsque deux plaques sont couplées, les feuilles correspondantes (5, 5') sont adjacentes.
  3. Connecteur selon l'une quelconque des revendications précédentes, dans lequel le bouchon (2) comporte des fentes (22) configurées pour accepter les feuilles (3, 3') des deux plaques (5, 5').
  4. Connecteur selon l'une quelconque des revendications précédentes, dans lequel la clé (4) est configurée avec un angle en coin, les ouvertures latérales (25, 25') du bouchon et les ouvertures centrales (33, 33') dans les feuilles ayant des des surfaces internes disposées le long de l'angle du coin de telle sorte que la clé, lorsqu'elle est insérée, est maintenue en place par friction et exerce une force vers le bas sur les plaques (5, 5') et une force opposée sur le bouchon (2).
  5. Connecteur selon l'une quelconque des revendications précédentes, dans lequel le bouchon (2) possède un fond percé pour recevoir un boulon d'ancrage ou un boulon à tête ronde et à col carré.
  6. Connecteur selon l'une quelconque des revendications précédentes, dans lequel le bouchon (2) est claveté pour déterminer une orientation préférée.
  7. Connecteur selon l'une quelconque des revendications précédentes, dans lequel la clé (4) a des faces ou des encoches rugueuses ou texturées s'engageant avec les bords correspondants dans les feuilles, et/ou un trou pouvant s'engager avec un crochet pour le retrait.
  8. Connecteur selon l'une quelconque des revendications précédentes, dans lequel les ouvertures centrales (33, 33') des feuilles (3, 3') ont un côté incurvé configuré pour toucher la clé (4) lorsqu'elle est insérée.
  9. Système de construction comprenant une pluralité de connecteurs identiques, chaque connecteur ayant deux plaques de connexion (5, 5'), chaque plaque (5, 5') ayant une rainure ouverte sur un côté et une feuille centrale (3, 3') s'étendant parallèlement à un axe central de la rainure et décalée par rapport à l'axe central, s'élevant orthogonalement au plan général des plaque de telle sorte que les plaques (5, 5') puissent être jointes symétriquement en sorte que leurs rainures respectives se joignent et laissent une ouverture accessible contenant les feuilles centrales (3, 3') l'une à côté de l'autre, le connecteur comprenant un bouchon (2) insérable dans l'ouverture et une clé plate (4) insérable dans des ouvertures latérales (25, 25') du bouchon (2) et dans des ouvertures centrales (33, 33') des feuilles (3, 3') pour bloquer les plaques (5, 5') et le bouchon (2) dans une liaison rigide, dans lequel les bouchons (2) sont fixés à des éléments horizontaux (F2), les plaques (5, 5' ) sont fixées aux éléments de construction (B1) de telle sorte que lorsque deux éléments de construction sont placés côte à côte, les plaques se rejoignent entre les éléments de construction (B1), et une ouverture latérale est disponible pour insérer la clé (4), joignant ainsi de manière rigide les éléments de construction (B1) aux éléments horizontaux (F2).
  10. Système de construction selon la revendication précédente, dans lequel les éléments de construction (B1) comprennent des sections de paroi pleine hauteur ayant deux paires superposées de plaques de connexion opposées, une paire à une extrémité inférieure et une paire à une extrémité supérieure.
  11. Système de construction selon l'une des revendications 9 et 10, dans lequel les éléments de construction (B1) comprennent des sections de mur ou des linteaux de hauteur réduite ayant une paire de plaques de connexion opposées au même niveau.
  12. Système de construction selon l'une quelconque des revendications 9 à 11, dans lequel les éléments de construction (B1) comprennent des poteaux d'angle ayant deux paires superposées de plaques de connexion à angle droit, une paire à une extrémité inférieure et une paire à une extrémité supérieure.
  13. Système de construction selon l'une quelconque des revendications 9 à 12, dans lequel les éléments de construction (B1) ont une couche d'isolation et/ou des canaux pour le passage de la plomberie, du câblage, de la ventilation, du chauffage ou de la climatisation.
  14. Système de construction selon l'une quelconque des revendications 9 à 13, dans lequel les éléments de construction (B1) sont constitués de bois d'oeuvre ou de bois d'ingénierie.
  15. Système de construction selon l'une quelconque des revendications 9 à 14, dans lequel la clé (4) est configurée pour disparaître sous un côté d'un élément de construction lorsque le connecteur est verrouillé.
EP22179433.2A 2021-06-24 2022-06-16 Système de construction et connecteur correspondant Active EP4108844B1 (fr)

Applications Claiming Priority (1)

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US202163214543P 2021-06-24 2021-06-24

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EP4108844B1 true EP4108844B1 (fr) 2024-03-20

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2352801A1 (de) * 1973-10-20 1975-04-30 Bosch & Wuestenrot Strukturbau Vorrichtung zum befestigen von wandelementen auf fusspunktteilen
FR2874947B1 (fr) * 2004-09-09 2006-11-10 Vincent Elian Aprin Procede d'assemblage et de jonction pour panneaux composites
AT519093B1 (de) * 2016-09-30 2018-04-15 Univ Wien Tech Verbindungsvorrichtung zur Verbindung von dünnwandigen Fertigteilen und damit ausgestattete Fertigteile

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