EP2241700B1 - Dowel for connecting concrete panels - Google Patents
Dowel for connecting concrete panels Download PDFInfo
- Publication number
- EP2241700B1 EP2241700B1 EP10003730.8A EP10003730A EP2241700B1 EP 2241700 B1 EP2241700 B1 EP 2241700B1 EP 10003730 A EP10003730 A EP 10003730A EP 2241700 B1 EP2241700 B1 EP 2241700B1
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- European Patent Office
- Prior art keywords
- dowel
- concrete
- spiral
- teeth
- tooth
- Prior art date
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- 239000004567 concrete Substances 0.000 title claims description 111
- 239000000463 material Substances 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 2
- 239000011796 hollow space material Substances 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 description 9
- 239000011295 pitch Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/18—Spacers of metal or substantially of metal
Definitions
- the invention relates to a concrete plug for connecting concrete shells according to the preamble of claim 1.
- Concrete trays are used in prefabrication to produce a so-called precast slab. It is known to first produce an upper concrete shell and then leave a lower concrete shell and between the two concrete shells a corresponding cavity to fill this cavity with an insulating material.
- WO 2004/099520 A1 a concrete plug for connecting two concrete shells of a precast slab, which is anchored positively in the casting both in the one and in the other concrete shell, wherein the concrete dowel consists of a metal plate which extends across the cavity between the one and the other concrete shell, and that arranged in the metal plate recesses are forming in the metal plate facing each other and aligned with each other aligned teeth.
- the teeth are formed as tabs which engage in associated slots of arranged in the concrete shells corner flanges.
- the US 2 334 369 A discloses an elongated concrete plug surrounded by a pressure distribution body in the form of a helix.
- the CH 683933 A1 discloses a spacer bar for concrete reinforcing material having recesses, recesses and teeth.
- the DE 296 13 627 U1 describes a spacer for concrete construction, which has recesses and teeth.
- the invention has the object of providing a concrete plug of the type mentioned in such a way that it can be made particularly inexpensive and that it can be brought particularly favorable in a composite with the upper and lower concrete shell, without the risk that the Concrete in the area of the composite is attacked or even destroyed.
- the invention is characterized by a concrete plug with the features of claim 1.
- Such a pressure distribution body is formed in a first preferred embodiment is metal or plastic helix.
- a slotted tube or sleeve and the like body is used as the pressure distribution body.
- the teeth get a "muzzle”, so to speak, so that they no longer reach directly into the concrete, but accomplish this with the interposition of a pressure distribution body.
- the helix is formed continuously cylindrical over the entire axial length. It can also be used other helical shapes, such. B. conical coils or biconical coils, the z. B. cone-shaped or pyramid-shaped.
- the helix is formed in the middle longitudinal symmetry, that is, on its left side as well as the same geometric conditions as on the right side.
- the middle region can in this case have either larger spiral turns or even smaller spiral turns than the two end faces.
- the helix is provided only to provide a certain degree of compression for the purpose of mounting the helix on the opposite and mutually facing teeth.
- the coil must be compressed in the axial direction, to the extent that it fits in the recess between the two teeth and then spread apart resiliently, so that the one tooth in the one end of the helical winding engages and the other tooth in the other end.
- a tubular body is slotted in such a way that it has in each case radially end having slots on the front side, which are attached directly to the teeth. Even with such a non-axially compressible tubular body (pressure distribution body), it is possible to defuse the engagement of the teeth in the concrete material. It is therefore not necessarily necessary solution to the resilient compressibility of the coil, although this embodiment is preferred, because this is a simple assembly is given.
- articulated kinkable connecting rod and other connecting means can be used, such.
- FIG. 1 is generally shown that in a concrete upper shell 1 and a lower concrete shell 2, a concrete plug 3 is at least partially cast, the pouring process in the lower concrete shell 2 already completed, while the pouring process is completed only partially in the upper concrete shell to to show the engagement of the concrete plug 3 in the upper concrete shell 1.
- the concrete plug 3 consists of a metal plate 4, the lateral webs 6, 7, between which a central recess 5 is present, which is profiled approximately rectangular.
- This recess is used to pass lines and pipes when the two concrete shells 1, 2 are connected to each other and in the cavity specific lines and pipes to be performed.
- a pressure distribution body 11 is provided in the region between the teeth 9, 10, which consists of a coil 12 in the embodiment shown.
- Each recess 8 with the teeth 9, 10 carries such a coil 12, and there are shown only by way of example two such coils.
- the length of such a concrete plug 3 corresponds to the connection width between the concrete shells 1, 2 and has z.
- B a length of 6 to 15 m.
- the recesses 8 indicated there are arranged with the teeth 9, 10.
- FIG. 2 the influence of the helixes with different helical diameters and different pitches compressive strength of the concrete is shown, if - as shown - the helix 12 each covers a tooth 9, 10.
- FIG. 3 shows the expansion increase of the constricted concrete, if according to the invention a coil 12 between teeth 9, 10 is installed.
- This increase helps, in particular with the high concrete strength, also to ensure a similar elongation and thus to enable a ductile behavior.
- this technique differs from the use of high strength concrete in conjunction with concrete dowels with the use of helical reinforcement.
- FIG. 4 is shown schematically how a coil 12 according to the invention contributes to the distribution of pressure on the tooth 10.
- the tooth 10 deforms due to corresponding deformation stresses in the direction of arrow 13 and thus assumes its position 10 '(dashed line).
- the coil according to the invention which surrounds the tooth 10 at least partially with its turn 15, so that the shear stresses carried into the interior of the coil 12 in the arrow directions 17 in the Concrete material 14 of the helix are received and will not be carried to the outside.
- this is a reinforcement of the tooth 10 by the coil 12, and harmful shear stresses are not carried into the surrounding material, as was the case in the prior art.
- FIG. 5 shows as a further embodiment that it is sufficient only to pour a concrete plug 23 in an upper concrete shell 1 with the coil 12 according to the invention, the lower portion then remains free.
- a structure is z. B. used when the upper concrete shell is directly on the concrete dowel 3 on a corresponding bearing surface.
- FIG. 6 shows another embodiment of a dowel 23, which is designed as a double-T-carrier, wherein the upper plate 18 of the concrete plug 23 has the recesses 8 and in turn the teeth 9, 10 are formed, which are inventively covered by a respective coil 12 ,
- FIG. 6 shows that such a double-T-beam with its lower plate 19 can also be placed on a mounting plane, without it being necessary to pour the lower part in a lower concrete shell 2.
- anchor 23 as a double-T-carrier also on the lower plate 19, the recesses 8 shown on the upper plate 18 with the teeth 9, 10 and the coils 12 show.
- FIG. 7 shows as a further embodiment that a double-T-carrier according to the FIG. 6 is poured directly into an upper and lower concrete shell 1, 2 and in this case the coils 12 are provided both in the upper region and in the lower region.
- FIGS. 8 to 10 show as a pressure distribution body a slotted tube 22, which has distributed around the circumference arranged slots 20.
- frontal slots 20 so that they reach over the teeth to be reinforced 9, 10 and thus protect the teeth.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
Description
Die Erfindung betrifft einen Betondübel zur Verbindung von Betonschalen nach dem Oberbegriff des Patentanspruches 1.The invention relates to a concrete plug for connecting concrete shells according to the preamble of
Betonschalen werden im Fertigbau verwendet, um eine sogenannte Fertigteilplatte herzustellen. Hierbei ist es bekannt, zunächst eine obere Betonschale herzustellen sowie dann eine untere Betonschale und zwischen beiden Betonschalen einen entsprechenden Hohlraum zu belassen, um diesen Hohlraum mit einem Dämmmaterial auszufüllen.Concrete trays are used in prefabrication to produce a so-called precast slab. It is known to first produce an upper concrete shell and then leave a lower concrete shell and between the two concrete shells a corresponding cavity to fill this cavity with an insulating material.
Es besteht das Bedürfnis, dass man die obere und die untere Betonschale stellenweise fest miteinander verbindet, wozu besondere Betondübel verwendet werden. Es ist hierbei bekannt, zur Verbindung der oberen mit der unteren Betonschale zwecks Herstellung einer Fertigteilplatte die sogenannten Betondübel mit Kopfbolzen zu verwenden. Ein solcher Betonbolzen weist auf beiden Seiten angeordnete Kopfbolzen auf, die von einem Zwischenteil ausgehen und mit diesem befestigt sind. Die oberen Kopfbolzen sind jeweils in der oberen Betonschale eingegossen, und das Zwischenteil erstreckt sich durch den Hohlraum zwischen der oberen und der unteren Betonschale. In gleicher Weise sind auch die unten liegenden Kopfbolzen in der unteren Betonschale eingegossen.There is a need that one connects the upper and lower concrete shell in places firmly together, including special concrete dowels are used. It is known to use the so-called concrete dowels with headed bolts for the connection of the upper and the lower concrete shell for the purpose of producing a prefabricated slab. Such a concrete bolt has on both sides arranged head bolts, which emanate from an intermediate part and are secured thereto. The upper head bolts are each cast in the upper concrete shell, and the intermediate part extends through the cavity between the upper and lower concrete shell. In the same way, the lower head bolts are cast in the lower concrete shell.
Die Verwendung eines Betondübels mit Kopfbolzen hat sich bewährt. Es hat sich jedoch rausgestellt, dass die Montage eines solchen Betondübels außerordentlich aufwändig ist, und es entstehen hohe Kosten bei der Montage und beim Eingießen in der oberen und unteren Betonschale.The use of a concrete plug with headed bolts has proven itself. However, it has been found that the installation of such a concrete dowel is extremely complex, and there are high costs for installation and pouring in the upper and lower concrete shell.
Als nächstliegender Stand der Technik offenbart die
Die
Die
Die
The
The
Der Erfindung liegt die Aufgabe zugrunde, einen Betondübel der eingangs genannten Art so weiterzubilden, dass er besonders kostengünstig hergestellt werden kann und dass er besonders günstig in einen Verbund mit der oberen und der unteren Betonschale gebracht werden kann, ohne dass die Gefahr besteht, dass der Beton im Bereich des Verbundes angegriffen oder gar zerstört wird.The invention has the object of providing a concrete plug of the type mentioned in such a way that it can be made particularly inexpensive and that it can be brought particularly favorable in a composite with the upper and lower concrete shell, without the risk that the Concrete in the area of the composite is attacked or even destroyed.
Zur Lösung der gestellten Aufgabe ist die Erfindung durch einen Betondübel mit den Merkmalen des Anspruchs 1 gekennzeichnet.To achieve the object, the invention is characterized by a concrete plug with the features of
Mit der gegebenen technischen Lehre ergibt sich der wesentliche Vorteil, dass es nunmehr vorgesehen ist, nicht mehr die nackten Zähne des Betondübels in dem Betonmaterial der einen und möglicherweise auch der anderen Betonschale zu verankern, sondern dass diese Zähne mit einem Druckverteilungskörper bewehrt werden.With the given technical teaching, there is the significant advantage that it is now planned not to anchor the bare teeth of the concrete anchor in the concrete material of one and possibly the other concrete shell, but that these teeth are reinforced with a pressure distribution body.
Dies hat den wesentlichen Vorteil, dass nun durch die Anordnung eines Druckverteilungskörpers es nicht mehr möglich ist, dass bei entsprechender Bewegungsbelastung der Zähne diese sozusagen in den Beton hineinknabbern und den Beton in dem Eingriffsbereich, in den sie hineingreifen, zerstören oder "anknabbern".This has the significant advantage that now by the arrangement of a pressure distribution body, it is no longer possible that with a corresponding movement load of the teeth sober it into the concrete and destroy the concrete in the engagement area in which they reach into, or "nibble".
Durch die Verwendung eines Druckverteilungskörpers werden die Druckspitzen, die von den Zähnen des Betondübels in den Beton eingetragen werden, entfernt, verteilt und großflächig auf den umgehenden Beton übertragen, wodurch es deshalb nicht mehr zu einem "Anknabbern" der Zähne in das Betonmaterial der Betonschale kommt.By using a pressure distribution body, the pressure peaks, which are registered by the teeth of the concrete anchor in the concrete, removed, distributed and transferred over a large area on the surrounding concrete, which therefore no longer "nibbling" the teeth in the concrete material of the concrete shell ,
Ein solcher Druckverteilungskörper ist in einer ersten bevorzugten Ausführungsform is Metall- oder Kunststoffwendel ausgebildet.Such a pressure distribution body is formed in a first preferred embodiment is metal or plastic helix.
Es handelt sich also um eine spiralförmige Wendel, wobei die eine Windung formschlüssig auf dem einen Zahn aufsitzt, sodass der Zahn in den Wendelinnenraum dieser Wendel eingreift, und in gleicher Weise greift auch der gegenüberliegende Zahn des Betondübels in den Innenraum der Wendel ein.It is therefore a helical coil, wherein the one turn is positively seated on the one tooth, so that the tooth engages in the helical interior of this helix, and in the same way engages the opposite tooth of the concrete anchor in the interior of the helix.
Damit sind die Zahnangriffsflächen, die ansonsten in den Beton hineingreifen würden, "entschärft" und sie greifen vielmehr in den Innenraum der Wendel hinein. Dadurch kommt es zu einer Druckverteilung, wenn die beiden Zähne aufgrund einwirkender Druckspannungen sich gegeneinander bewegen, denn sie bewegen sich in den Innenraum der Wendel hinein und das dort eingegossene Betonmaterial gerät unter Druckspannung, sodass das Betonmaterial sich radial verteilt und ausweicht, ohne dass es zu einer lokalen Zerstörung des Betonmaterials in diesem Bereich kommt.Thus, the tooth attack surfaces, which would otherwise reach into the concrete, "defused" and they rather engage in the interior of the helix. This results in a pressure distribution when the two teeth move against each other due to acting compressive stresses, because they move into the interior of the coil inside and there poured concrete material is under compressive stress, so that the concrete material spreads radially and evades without it a local destruction of concrete material in this area comes.
Dies ist ein wesentlicher Vorteil gegenüber dem Stand der Technik, bei dem es noch nicht bekannt war, zwischen den Zähnen eines Betondübels einen Druckverteilungskörper anzuordnen.This is a significant advantage over the prior art, where it was not yet known to place a pressure distribution body between the teeth of a concrete plug.
In einer zweiten bevorzugten Ausführungsform der Erfindung wird als Druckverteilungskörper ein geschlitztes Rohr oder eine Büchse und dergleichen Körper verwendet.In a second preferred embodiment of the invention, a slotted tube or sleeve and the like body is used as the pressure distribution body.
Wichtig ist nur, dass der Kraftangriffspunkt, den der jeweilige Zahn unmittelbar in den Beton entfaltet, nunmehr dadurch entschärft wird, dass im Bereich dieses Kraftangriffspunktes ein Druckverteilungskörper angeordnet ist, der seinerseits mit dem Betonmaterial befüllt ist.It is only important that the force application point, which unfolds the respective tooth directly into the concrete, is now defused by the fact that in the region of this force application point a pressure distribution body is arranged, which in turn is filled with the concrete material.
Die Zähne bekommen sozusagen einen "Maulkorb", sodass sie also nicht mehr direkt in den Beton hineingreifen, sondern dies unter Zwischenschaltung eines Druckverteilungskörpers bewerkstelligen.The teeth get a "muzzle", so to speak, so that they no longer reach directly into the concrete, but accomplish this with the interposition of a pressure distribution body.
Man muss deshalb den lokalen Bereich, mit dem der Zahn in den Beton eingreift, entschärfen.It is therefore necessary to defuse the local area with which the tooth intervenes in the concrete.
Für die Ausbildung der Wendel ist es nicht lösungsnotwendig, dass die Wendel durchgehend über die gesamte axiale Länge zylindrisch ausgebildet ist. Es können auch andere Wendelformen verwendet werden, wie z. B. konische Wendeln oder doppelkonische Wendeln, die z. B. kegelförmig oder pyramidenförmig ausgebildet sind.For the formation of the helix, it is not necessary for the solution that the helix is formed continuously cylindrical over the entire axial length. It can also be used other helical shapes, such. B. conical coils or biconical coils, the z. B. cone-shaped or pyramid-shaped.
Vorteilhaft ist es, wenn die Wendel mittenlängssymmetrisch ausgebildet ist, dass heißt, an ihrer linken Seite genauso die gleichen geometrischen Verhältnisse aufweist wie auf der rechten Seite.It is advantageous if the helix is formed in the middle longitudinal symmetry, that is, on its left side as well as the same geometric conditions as on the right side.
Der Mittenbereich kann hierbei dann entweder größere Wendelwindungen oder auch kleinere Wendelwindungen als die beiden Stirnseiten aufweisen.The middle region can in this case have either larger spiral turns or even smaller spiral turns than the two end faces.
Wichtig hierbei ist, dass die Wendel nur deshalb vorgesehen ist, um einen gewissen Zusammendrückungsgrad zwecks Montage der Wendel auf den einander gegenüberliegenden und gegeneinander gerichteten Zähnen vorzusehen. Zu diesem Zweck (zum Zweck der Montage) muss deshalb die Wendel in axialer Richtung zusammengedrückt werden, und zwar soweit, dass sie in die Ausnehmung zwischen den beiden Zähnen passt und dann federnd auseinander gespreizt wird, sodass der eine Zahn in die eine Stirnseite der Wendelwindung eingreift und der andere Zahn in die andere Stirnseite.It is important here that the helix is provided only to provide a certain degree of compression for the purpose of mounting the helix on the opposite and mutually facing teeth. For this purpose (for the purpose of assembly), therefore, the coil must be compressed in the axial direction, to the extent that it fits in the recess between the two teeth and then spread apart resiliently, so that the one tooth in the one end of the helical winding engages and the other tooth in the other end.
Wenn man auf eine federnde Wendel verzichten will, gibt es noch andere Möglichkeiten für die Ausbildung als Druckverteilungskörper. Es kann vorgesehen sein, dass ein Rohrkörper derart geschlitzt ist, dass er jeweils stirnseitig radial aufweisende Schlitze aufweist, die direkt auf die Zähne aufgesteckt werden. Auch mit einem solchen, nicht axial zusammendrückbaren Rohrkörper (Druckverteilungskörper) ist es möglich, den Eingriff der Zähne in das Betonmaterial zu entschärfen. Es kommt also nicht unbedingt lösungsnotwendig auf die federnde Zusammendrückbarkeit der Wendel an, obwohl diese Ausführungsform bevorzugt wird, weil hierdurch eine einfache Montage gegeben ist.If you want to do without a resilient coil, there are other opportunities for training as a pressure distribution body. It can be provided that a tubular body is slotted in such a way that it has in each case radially end having slots on the front side, which are attached directly to the teeth. Even with such a non-axially compressible tubular body (pressure distribution body), it is possible to defuse the engagement of the teeth in the concrete material. It is therefore not necessarily necessary solution to the resilient compressibility of the coil, although this embodiment is preferred, because this is a simple assembly is given.
In einer anderen Ausgestaltung kann es vorgesehen sein, dass nur auf jeder Zahnseite einige wenige Windungen einer Wendel vorhanden sind und dass diese Windungen durch einen gelenkig abknickbaren Stab miteinander verbunden sind.In another embodiment, it may be provided that only a few turns of a coil are present on each side of the tooth and that these turns are connected to each other by a rod bendable articulated.
Hierbei ist ebenfalls eine leichte Montage möglich, denn es reicht aus, zur Montage den mittigen Verbindungsstab abzuknicken und die beiden Windungen auf die Zähne aufzusetzen, um dann den Stab zu spreizen und in eine gestreckte Spannlage zu bringen, welche dafür sorgt, dass die beiden Windungen aus dem einen und dem anderen Zahn lagenrichtig befestigt sind.Here, also easy assembly is possible, because it is sufficient to bend the central connecting rod for mounting and put the two turns on the teeth, then to spread the rod and bring in a stretched clamping position, which ensures that the two turns from one and the other tooth are fixed correctly.
Statt eines solchen gelenkig knickbaren Verbindungsstabes können auch andere Verbindungsmittel verwendet werden, wie z. B. ein Verbindungsdämpfer oder eine Verbindungsfeder.Instead of such articulated kinkable connecting rod and other connecting means can be used, such. B. a connection damper or a connecting spring.
Der Erfindungsgegenstand der vorliegenden Erfindung ergibt sich nicht nur aus dem Gegenstand der einzelnen Patentansprüche, sondern auch aus der Kombination der einzelnen Patentansprüche untereinander.The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.
Alle in den Unterlagen, einschließlich der Zusammenfassung offenbarten Angaben und Merkmale, insbesondere die in den Zeichnungen dargestellte räumliche Ausbildung, werden als erfindungswesentlich beansprucht, soweit sie einzeln oder in Kombination gegenüber dem Stand der Technik neu sind.All information and features disclosed in the documents, including the abstract, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are novel individually or in combination with respect to the prior art.
Im Folgenden wird die Erfindung anhand von mehrere Ausführungswege darstellenden Zeichnungen näher erläutert. Hierbei gehen aus den Zeichnungen und ihrer Beschreibung weitere erfindungswesentliche Merkmale und Vorteile der Erfindung hervor.In the following, the invention will be explained in more detail with reference to drawings illustrating several execution paths. Here are from the drawings and their description further features essential to the invention and advantages of the invention.
Es zeigen:
- Figur 1:
- schematisiert im Teilschnitt eine erste Ausführungsform eines teilweise in die Betonschalen eingebauten Betondübels
- Figur 2:
- die Abhängigkeit der Druckfestigkeit des Betons in Abhängigkeit von dem Wendeldurchmesser bezogen auf verschiedene Ganghöhen der Wendelbewehrung
- Figur 3:
- der Dehnungszuwachs im umschnürten Beton, der mit einer Wendel bewehrt ist
- Figur 4:
- schematisiert die Druckverhältnisse eines wendelbewehrten Zahnes
- Figur 5:
- eine zweite Ausführungsform eines Betondübels
- Figur 6:
- eine dritte Ausführungsform eines Betondübels
- Figur 7:
- eine vierte Ausführungsform eines Betondübels
Figuren 8 bis 10:- eine fünfte Ausführungsform eines Betondübels mit einem Druckverteilungskörper als geschlitztes Rohr
- FIG. 1:
- schematized in the partial section of a first embodiment of a partially built into the concrete shells concrete dowel
- FIG. 2:
- the dependence of the compressive strength of the concrete as a function of the helical diameter relative to different pitches of the helical reinforcement
- FIG. 3:
- the increase in expansion in the constricted concrete, which is reinforced with a helix
- FIG. 4:
- schematizes the pressure conditions of a spiral-reinforced tooth
- FIG. 5:
- a second embodiment of a concrete plug
- FIG. 6:
- a third embodiment of a concrete plug
- FIG. 7:
- a fourth embodiment of a concrete plug
- FIGS. 8 to 10:
- a fifth embodiment of a concrete plug with a pressure distribution body as a slotted tube
In
Der Betondübel 3 besteht aus einer Metallplatte 4, die seitliche Stege 6, 7 aufweist, zwischen denen eine mittige Ausnehmung 5 vorhanden ist, die etwa rechteckförmig profiliert ist.The
Diese Ausnehmung dient zum Hindurchführen von Leitungen und Rohren, wenn die beiden Betonschalen 1, 2 miteinander verbunden sind und im Hohlraum noch bestimmte Leitungen und Rohre geführt werden sollen.This recess is used to pass lines and pipes when the two
Wichtig ist nun, dass im Eingussbereich der oberen und unteren Betonschale 1, 2 der Betondübel 3 eine Anzahl von im Abstand voneinander angeordneten etwa C-förmig profilierten Ausnehmungen 8 aufweist, sodass sich im Bereich der Ausnehmung zwei einander gegenüberliegende und gegeneinander gerichtete Zähne 9, 10 ausbilden.It is important now that in the run-off of the upper and lower
Wichtig ist nun, dass zur Erreichung eines besseren Verbundes eines solchen Metalldübels erfindungsgemäß nun ein Druckverteilungskörper 11 im Bereich zwischen den Zähnen 9, 10 vorgesehen ist, der im gezeigten Ausführungsbeispiel aus einer Wendel 12 besteht.It is important that in order to achieve a better bond of such a metal dowel according to the invention now a
Jede Ausnehmung 8 mit den Zähnen 9, 10 trägt eine solche Wendel 12, und es sind nur lediglich beispielhaft zwei solcher Wendeln dargestellt.Each
Die Länge eines solchen Betondübels 3 entspricht der Verbindungsbreite zwischen den Betonschalen 1, 2 und hat z. B. eine Länge von 6 bis 15 m.The length of such a
In Abständen von etwa 40 cm sind die dort angegebenen Ausnehmungen 8 mit den Zähnen 9, 10 angeordnet.At intervals of about 40 cm, the
In
Der Einfluss einer Umschnürung mit einer Wendelbewehrung auf die Druckfestigkeit und die Dehnfähigkeit kann rechnerisch erfasst werden. Die folgenden Einflussparameter bestimmen den Zuwachs an Festigkeit und zugehöriger Dehnung:
- Durchmesser der Umschnürung dc
- Durchmesser der Wendelbewehrung Øw
- Ganghöhe der Wendelbewehrung sw
- Fließspannung der Wendelbewehrung fy
- Diameter of the strap d c
- Diameter of spiral reinforcement Ø w
- Pitch of helical reinforcement s w
- Yield stress of helical reinforcement f y
Dabei ist folgender Einfluss feststellbar. Mit der Steigerung der Fließspannung der Wendelbewehrung steigt der Zuwachs an Festigkeit und Dehnung für den Beton. Je geringer die Abmessungen des umschnürten Bereichs desto markanter ist die Steigerung der Materialeigenschaften. Mit geringer werdender Ganghöhe nimmt die Druckfestigkeit und zugehörige Dehnfähigkeit zu. Mit dem Durchmesser der Wendelbewehrung nehmen ebenfalls die Materialeigenschaften zu.The following influence is noticeable. As the yield stress of the helical reinforcement increases, the increase in strength and elongation for the concrete increases. The smaller the dimensions of the strapped area, the more prominent the increase in material properties. With decreasing pitch increases the compressive strength and associated elasticity. With the diameter of the helical reinforcement also increase the material properties.
In dem Diagramm der
- Betondruckfestigkeit Ausgangsbeton fc = 30.0 N/mm2
- Dehnung bei Erreichen dieser Druckfestigkeit eo = 2.0 0/00
- Stahlfestigkeit fy = 500 N/mm2
- Durchmesser des umschnürten Bereichs Ø = 60 mm
- Concrete compressive strength starting concrete fc = 30.0 N / mm2
- Elongation on reaching this compressive strength eo = 2.0 0/00
- Steel strength fy = 500 N / mm2
- Diameter of the strapped area Ø = 60 mm
Dargestellt sind die Ergebnisse im Zuwachs der Betondruckfestigkeit für verschiedene Wendeldurchmesser Øw = 0, 2, 4, 6 mm (o - als Referenz ohne Wendel). Die Ganghöhe wurde im Abstand von 25 mm variiert, beginnend bei 25, 50, 75, 100 mm. Es zeigt sich, dass die Betondruckfestigkeit von einem Ausgangswert von fco = 30 N/mm2 bei einem Wendeldurchmesser von Øw = 6 mm und einer Ganghöhe von sw = 25 mm auf den Wert von fc1 = 105 N/mm2 (Faktor 3.5) gesteigert werden kann. Die Werte für Wendeldurchmesser und Wendelganghöhe sind in der praktischen Ausführung umsetzbar.The results are shown in the increase of the concrete compressive strength for different spiral diameters Øw = 0, 2, 4, 6 mm (o - as reference without helix). The pitch was varied at intervals of 25 mm, starting at 25, 50, 75, 100 mm. It is found that the concrete compressive strength increased from an initial value of f co = 30 N /
Ferner zeigt die
Die zugehörigen Dehnungen im umschnürten Beton werden ebenfalls massiv gesteigert, jedoch in einem Maße, welches noch größer ist als bei der Festigkeit. Für die vorgenannten Parameter ist in dem nachstehenden Diagramm in
Analog zu dem Zuwachs der Betondruckfestigkeit ist für einen Wendeldurchmesser von Øw = 6 mm und einer zugehörigen Ganghöhe von 25 mm eine Steigerung der Dehnung von 2.0 ○/○○ für den Ausgangsbeton auf 27.0 ○/○○ (Faktor 13.5) zu erwarten.Analogous to the increase in concrete compressive strength is for a helix diameter of Øw = 6 mm and an associated pitch of 25 mm an increase of the elongation of 2.0 ○ / ○○ for the starting concrete to 27.0 ○ / ○○ (factor 13.5) is to be expected.
Diese Steigerung hilft insbesondere bei der hohen Betonfestigkeit, auch eine ebenso große Dehnung zu gewährleisten und damit ein duktiles Verhalten zu ermöglichen. Damit unterscheidet sich diese Technik mit dem Einsatz einer Wendelbewehrung von der Verwendung von hochfestem Beton in Verbindung mit Betondübeln.This increase helps, in particular with the high concrete strength, also to ensure a similar elongation and thus to enable a ductile behavior. Thus, this technique differs from the use of high strength concrete in conjunction with concrete dowels with the use of helical reinforcement.
Aufgrund der vorgängigen Bestimmung der Betondruckfestigkeiten lässt sich nun der Widerstand des Betons bei der Verwendung von Betondübeln vorherbestimmen. Die Ergebnisse der Versuche zeigen auch, dass eine weitere Steigerung des Betonwiderstandes durch die Verwendung von Wendeln aus Stahl S500 und einem Wendeldurchmesser von 6 mm gegenüber den jetzigen Ergebnissen noch möglich ist. Damit wird wahrscheinlich zukünftig der Stahl für den Versagensmechanismus maßgeblich.Based on the previous determination of the concrete compressive strengths, the resistance of the concrete can now be predicted when using concrete anchors. The results of the tests also show that a further increase in concrete resistance through the use of S500 steel coils and a helix diameter of 6 mm is still possible compared to the present results. This will probably be the steel of the failure mechanism in the future.
Die möglichen großen Dehnungen bei umschnürtem Beton finden sich auch bei den Versuchen wieder, wie die bleibenden großen Verformungen aus den Stahlzähnen dokumentieren.The possible large strains in the case of reinforced concrete can also be found in the experiments, as documented by the permanent large deformations from the steel teeth.
In
Der Zahn 10 verformt sich aufgrund von entsprechenden Verformungsspannungen in Pfeilrichtung 13 und nimmt damit seine Stellung 10' (gestrichelte Darstellung) ein. Der Berührungspunkt 16, der in das Betonmaterial 14 eingreift, verschiebt sich somit an die Stellung 16'. Hierdurch entstehen erhebliche Schubspannungen, die in Pfeilrichtung 17 in das Betonmaterial 14 hineinreichen und versuchen, dieses Betonmaterial zu zerstören.The
Dazu dient nun die erfindungsgemäße Wendel, die mit ihrer Windung 15 den Zahn 10 mindestens teilweise umgibt, so dass die in das innere der Wendel 12 hineingetragenen Schubspannungen in den Pfeilrichtungen 17 in dem Betonmaterial 14 der Wendel aufgenommen werden und nicht nach außen weitergetragen werden. Damit handelt es sich also um eine Bewehrung des Zahnes 10 durch die Wendel 12, und schädliche Schubspannungen werden nicht in das umgebende Material hineingetragen, so wie dies beim Stand der Technik der Fall war.For this purpose, the coil according to the invention, which surrounds the
Die
Die
Die
Selbstverständlich kann auch diese besondere Form des Dübels 23 als Doppel-T-Träger auch an der unteren Platte 19 die an der oberen Platte 18 gezeigten Ausnehmungen 8 mit den Zähnen 9, 10 und den Wendeln 12 zeigen.Of course, this particular form of the
Die
Die
Es sind stirnseitige Schlitze 20 vorhanden, so dass diese über die zu bewehrenden Zähne 9, 10 hinübergreifen und so die Zähne schützen.There are
Im Innenraum des Schlitzrohres 22 ist hierbei wiederum das Betonmaterial 14 eingefüllt, so dass deshalb wiederum die Druckspannung, die von den Zähnen 9, 10 in den Innenraum des Schlitzrohres 22 eingetragen wird, von dem dortigen Betonmaterial 14 gemäß
- 11
- obere Betonschaleupper concrete shell
- 22
- untere Betonschalelower concrete shell
- 33
- Betondübelconcrete anchors
- 44
- Metallplattemetal plate
- 55
- Ausnehmungrecess
- 66
- Stegweb
- 77
- Stegweb
- 88th
- Ausnehmungrecess
- 99
- Zahntooth
- 1010
- Zahn 10'Tooth 10 '
- 1111
- DruckverteilungskörperPressure distribution body
- 1212
- Wendelspiral
- 1313
- Pfeilrichtungarrow
- 1414
- Betonmaterialconcrete material
- 1515
- Windungconvolution
- 1616
- Berührungspunkt 16'Touch point 16 '
- 1717
- Pfeilrichtungarrow
- 1818
- Platte obenPlate above
- 1919
- Platte untenPlate below
- 2020
- Schlitzslot
- 2121
- 2222
- Schlitzrohrslotted tube
- 2323
- Dübeldowel
Claims (7)
- Dowel (3) for connecting two concrete shells (1, 2) of a prefabricated slab, which is anchored in form-locking manner in both the first and the second concrete shell (1, 2) during the casting process, wherein the dowel (3) consists of a metal plate (4) or a double T member (23) which extends transversely through the hollow space between the upper concrete shell (1) and the lower concrete shell (2), and arranged in the dowel (3) there are recesses (5) which form teeth (9, 10) which face one another in the dowel (3) and point towards one another in alignment, wherein at least one pressure distributing element (11) is arranged in the region between the teeth (9, 10) of the dowel (3), characterised in that
the pressure distributing element (11) is either embodied in the form of a spiral (12) and at least one turn (15) of the spiral (12) is seated in form-locking manner on one tooth (9, 10), and the tooth (9, 10) engages in the interior of the spiral (12), and in that the opposing tooth (9, 10) of the dowel (3) engages in the interior of the spiral (12) in the same way,
or it is embodied in the form of a slit tube (22) or sleeve, wherein the slits (20) engage over the teeth (9, 10) to be sheathed and protect the teeth (9, 10). - Dowel (3) according to claim 1, characterised in that the recesses (8) are profiled with a C-shape.
- Dowel (3) according to claims 1 or 2, characterised in that the pressure distributing element (11) is embodied such that the concrete material is distributed radially and escapes.
- Dowel (3) according to claims 1 to 3, characterised in that the spiral (12) is embodied in the form of a conical spiral or a double-conical spiral.
- Dowel (3) according to claims 1 to 4, characterised in that a few turns (15) of the spiral (12) are present on each side of the tooth and in that these turns (15) are connected with one another by a connecting rod which can be bent like a hinge.
- Dowel (3) according to claim 5, characterised in that instead of a connecting rod which can be bent like a hinge use is made of a connecting damper or a connecting spring.
- Dowel (3) according to claims 1 to 6, characterised in that when the dowel (3) is embodied in the form of a double T member (23) at least one plate (18) of the dowel (3) has the recesses (8) and again in this case teeth (9, 10) are formed which are respectively covered by a spiral (12).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910016691 DE102009016691A1 (en) | 2009-04-07 | 2009-04-07 | Concrete dowels for connecting concrete shells |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2241700A2 EP2241700A2 (en) | 2010-10-20 |
EP2241700A3 EP2241700A3 (en) | 2015-06-24 |
EP2241700B1 true EP2241700B1 (en) | 2016-11-09 |
Family
ID=42144966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10003730.8A Active EP2241700B1 (en) | 2009-04-07 | 2010-04-07 | Dowel for connecting concrete panels |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2241700B1 (en) |
DE (1) | DE102009016691A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2334369A (en) * | 1941-03-20 | 1943-11-16 | Ralph D Yankee | Apparatus for supporting and spacing reinforcing devices |
CH683933A5 (en) * | 1991-06-13 | 1994-06-15 | Tegoma Ag Chur | Concrete reinforcement distance holder bar - has recesses with vertical sidewalls to hold the reinforcement material |
DE29613627U1 (en) * | 1996-08-07 | 1996-09-26 | Degen, Paul, 77830 Bühlertal | Multi-purpose spacer for concrete construction |
SE526311C2 (en) * | 2003-05-05 | 2005-08-23 | Christopher Nilsen | A consumable unit for forming a concrete wall structure, a concrete wall structure formed with the unit and a side plate for use in the unit |
-
2009
- 2009-04-07 DE DE200910016691 patent/DE102009016691A1/en not_active Ceased
-
2010
- 2010-04-07 EP EP10003730.8A patent/EP2241700B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
DE102009016691A1 (en) | 2010-10-14 |
EP2241700A3 (en) | 2015-06-24 |
EP2241700A2 (en) | 2010-10-20 |
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