EP0765967A1 - Method for making a shearload dowel and dowel produced by this method - Google Patents

Method for making a shearload dowel and dowel produced by this method Download PDF

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Publication number
EP0765967A1
EP0765967A1 EP96810578A EP96810578A EP0765967A1 EP 0765967 A1 EP0765967 A1 EP 0765967A1 EP 96810578 A EP96810578 A EP 96810578A EP 96810578 A EP96810578 A EP 96810578A EP 0765967 A1 EP0765967 A1 EP 0765967A1
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EP
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Prior art keywords
core
jacket
stainless steel
steel
shear force
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Granted
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EP96810578A
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German (de)
French (fr)
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EP0765967B1 (en
Inventor
Erich Müller
Gottfried Breuer
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Pecon AG
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Pecon AG
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Priority claimed from AU15026/97A external-priority patent/AU729030B2/en
Publication of EP0765967A1 publication Critical patent/EP0765967A1/en
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
    • E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
    • E01C11/14—Dowel assembly ; Design or construction of reinforcements in the area of joints
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49798—Dividing sequentially from leading end, e.g., by cutting or breaking

Definitions

  • the present invention relates to a method for producing a transverse force mandrel consisting of a steel core and a jacket made of stainless steel, and a transverse force mandrel produced by this method.
  • Shear force pins are used for horizontal connection and power transmission between two components.
  • they are used in the expansion joint area of two adjacent floor slabs and to support stair pedestal panels with adjoining components.
  • the shear force mandrels are supported on both sides of the expansion joint in corresponding bearing sleeves. While the horizontal stretching movement must be allowed, the relative vertical movement should be prevented.
  • shear force mandrels are inevitably subject to environmental conditions in the expansion joint area and can therefore corrode. Accordingly, many providers have switched to shear force mandrels made entirely of high-quality stainless steel to manufacture. Such shear force mandrels are preferably made of chromium-nickel-molybdenum steel. This is extremely expensive and still cannot meet security requirements in certain areas of application. According to recent findings, rods made entirely of stainless steel tend to become hydrogen embrittlement, which reduces the strength of the material.
  • the outer dimension of the core and the inner dimension of the jacket have a tolerance field.
  • the outer dimension of the casing has a tolerance field and such a tolerance field also has the inner dimension of the bearing sleeve in which the transverse force mandrel is mounted. As previously mentioned, all of these tolerances can add up.
  • the game thus obtained thus gives a certain freedom of movement in the vertical direction between two horizontal components which are connected to one another by means of transverse force mandrel connections. The vibrations occurring in the building therefore lead to vertical movements, which lead to corresponding crack formation in the Guide the area of the transverse force mandrel connections.
  • the tolerance field between the lateral force mandrel and the bearing sleeve in which the lateral force mandrel is stored is also reduced.
  • the shear force mandrel produced by the above-mentioned process can either be closed with a plastic plug or stainless steel rondelles can be inserted into the open jacket ends and welded therein.
  • the starting material for the production of a transverse force mandrel according to the method according to the invention is, on the one hand, a core 1 consisting of a steel rod and, on the other hand, a jacket 2 consisting of a stainless steel tube.
  • the core 1 can be made of a conventional structural steel. While the steps a) to c) to be described below mostly take place in appropriately equipped steelworks, the following steps d) to h) can be carried out in any company that manufactures technical construction products. In steps a) to c) the semi-finished product is manufactured, so to speak, while the subsequent steps d) to h) relate to the order-specific assembly.
  • a first step a the aforementioned jacket made of stainless steel pipe is drawn onto a correspondingly dimensioned steel rod 1 according to known technology, so that the steel rod then forms the core 1.
  • the core 1 itself acts as a calibration mandrel, which means that the desired approximate freedom of play is guaranteed.
  • the outer dimensions of the stainless steel jacket can be calibrated simultaneously or directly afterwards.
  • step b) a corresponding calibration tool is shown purely schematically.
  • the core 1 is drawn into the jacket 2 using commercially available rod material of several meters in length.
  • the extremely precise and at least approximately backlash-free pulling in of the steel core is carried out by adding an oil that is particularly suitable for this purpose.
  • the semifinished product thus obtained, shown in c) is delivered to a plant for the manufacture of technical construction products.
  • the receiver operation of the semi-finished product cuts the rod material 3 into corresponding rod sections 4 from step d). This is symbolically represented by the saw blade 30.
  • the core 1 is now pressed out of the casing 2 by a distance a. This protruding section 5 is then cut off flush with the jacket end, as shown in f). Thanks to the oil used in the drawing-in, the core 1 can be pressed out of the jacket 2 by means of corresponding hydraulic machines without any remaining deformations being found.
  • FIG. 2 shows a transverse force mandrel 10 produced according to the invention. While one half of the transverse force mandrel 10 is closed with a plastic plug 7, the other end is closed with a stainless steel rondelle inserted into the open jacket end 6.
  • Plastic plugs 7 are very suitable for certain applications, particularly in the interior of the building. The required tightness is achieved by appropriate sealing lips 8 on the plastic plug 7.
  • Insert dimensionally accurate Rondelle 9 made of stainless steel and finally weld them to the jacket 2.
  • the welding can be designed only point by point or as a circumferential weld seam 11. The somewhat increased strength does not result so much from a load-bearing effect of the rondelle 9, but rather from the absolutely fixed core 1 in the jacket 2. This results in a high-strength sandwich construction.
  • the strength of such a sandwich construction is higher than that of a one-piece shear force mandrel made from a solid bar. Accordingly, shear force mandrels with a smaller diameter can be used for dimensioning. This is not only a financial advantage, but also leads to a reduction in the size of the bearing sleeve of the transverse force mandrel and consequently to an increased concrete coverage of the bearing sleeve, which again has structural advantages.
  • the wall thickness of the jacket 2 in a certain relation to the diameter of the steel core 1. In general, however, it can be traced back to surprisingly small wall thicknesses of the jacket. Usual dimensions of the wall thickness of the stainless steel tube from which the jacket 2 is made are between 0.4 and 5.0 mm. The relatively small wall thickness of the casing 2 made of stainless steel naturally brings financial advantages again.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forging (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

The steel core (1) consisting of a non-rust-resistant steel bar inside a tubular casing (2) made of stainless steel. The bar thereby formed is cut off into the required lengths. The core is partially ejected from the casing, and the ejected part cut off. The core is then pushed back by half the distance of the ejected and cut off part. The open casing ends (6) are closed by inserting stainless steel round discs (9) which are welded in, alternatively, the open casing ends are closed by a plastics plug (7).

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Querkraftdornes bestehend aus einem Stahlkern und einem Mantel aus rostfreiem Stahl, sowie einen Querkraftdorn hergestellt nach diesem Verfahren.The present invention relates to a method for producing a transverse force mandrel consisting of a steel core and a jacket made of stainless steel, and a transverse force mandrel produced by this method.

Querkraftdorne dienen der horizontalen Verbindung und Kraftübertragung zwischen zwei Bauelementen. Insbesondere werden sie eingesetzt im Dehnfugenbereich zweier benachbarter Bodendeckenplatten sowie zur Auflage von Treppenpodestplatten mit anschliessenden Bauelementen. Die Querkraftdorne lagern beidseitig der Dehnfuge in entsprechenden Lagerhülsen. Während die horizontale Dehnbewegung zugelassen werden muss, soll die relative vertikale Bewegung unterbunden werden.Shear force pins are used for horizontal connection and power transmission between two components. In particular, they are used in the expansion joint area of two adjacent floor slabs and to support stair pedestal panels with adjoining components. The shear force mandrels are supported on both sides of the expansion joint in corresponding bearing sleeves. While the horizontal stretching movement must be allowed, the relative vertical movement should be prevented.

Die Querkraftdorne sind im Dehnfugenbereich unweigerlich Umweltbedingungen unterworfen und können daher korrodieren. Entsprechend sind viele Anbieter dazu übergegangen, Querkraftdorne vollständig aus hochwertigem rostfreiem Stahl zu fertigen. Vorzugsweise sind solche Querkraftdorne aus Chrom-Nickel-Molybdän-Stahl gefertigt. Dies ist ausserordentlich teuer und vermag trotzdem in gewissen Anwendungsbereichen den Sicherheitsvorstellungen nicht zu entsprechen. Gemäss neueren Erkenntnissen neigen vollständig aus rostfreiem Stahl gefertigte Stäbe zur Wasserstoffversprödung, welche die Festigkeit des Materials reduziert.The shear force mandrels are inevitably subject to environmental conditions in the expansion joint area and can therefore corrode. Accordingly, many providers have switched to shear force mandrels made entirely of high-quality stainless steel to manufacture. Such shear force mandrels are preferably made of chromium-nickel-molybdenum steel. This is extremely expensive and still cannot meet security requirements in certain areas of application. According to recent findings, rods made entirely of stainless steel tend to become hydrogen embrittlement, which reduces the strength of the material.

Aufgrund obiger Ueberlegungen ging man dazu über, Zug- oder Druckstäbe aus korrodierendem Stahl zur Verbindung zweier Betonelemente so zu gestalten, dass zumindest im Fugenbereich der Stab von einer Hülse aus korrosionsbeständigem Material umschlossen war und der Zwischenraum zwischen Hülse und Stahl mit einer aushärtenden Masse ausgegossen wurde. Während sich diese Lösung gemäss der DE-A-38 01 121 für Verankerungsstäbe bewährt hat, konnte sich dieses System für Querkraftdorne aus verschiedenen Gründen nicht durchsetzen.Based on the above considerations, it was decided to design tension or compression rods made of corrosive steel to connect two concrete elements so that at least in the joint area the rod was enclosed by a sleeve made of corrosion-resistant material and the space between the sleeve and steel was poured out with a hardening compound . While this solution has proven itself for anchoring rods in accordance with DE-A-38 01 121, this system has not been able to establish itself for transverse force mandrels for various reasons.

Die wesentlichsten Probleme stellten sich bei der exakten Einbettung des Kernes in der Hülse und andererseits in der Fertigung solcher Querkraftdorne ein. Die Anmelderin ging daher dazu über, Hülsen aus rostfreiem Stahl abzulängen, diese als Mantel zu verwenden, in die kürzere korrodierende Stahlstäbe als Kern eingeschoben werden, und die offenen Enden mit einem Kunststoffstopfen zu verschliessen. Diese Lösung ergab Querkraftdorne, die sich bezüglich den Materialeigenschaften ausgezeichnet bewährt haben.The most important problems arose with the exact embedding of the core in the sleeve and, on the other hand, with the manufacture of such shear force mandrels. The applicant therefore went to cutting sleeves made of stainless steel, using them as a jacket, into which shorter corrosive steel rods are inserted as the core, and sealing the open ends with a plastic stopper. This solution resulted in shear force mandrels that have proven themselves in terms of material properties.

Wie bereits eingangs erwähnt, sollte die Verbindung zwischen zwei horizontalen Bauelementen, die mittels den Querkraftdornen hergestellt wird, Bewegungen in der vertikalen Richtung relativ zueinander praktisch unterbinden. Es hat sich jedoch gezeigt, dass die bezüglich der materiellen Zusammensetzung optimalen Querkraftdorne der letztgenannten Art diese Bedingung nicht genügend zu erfüllen vermögen. Das Einschieben eines Stahlkerns in einen Mantel aus rostfreiem Stahl bedingt ein gewisses Spiel. Aus wirtschaftlichen Gründen ist es nicht möglich, sämtliche Komponenten einer Querkraftdornverbindung aus kalibrierten Bestandteilen zu fertigen. Und auch dann ist ein spielfreies Einschieben eines Kerns in einen Mantel rein technisch nicht möglich. Bei der bekannten Lösung ergeben sich aus fertigungstechnischen Gründen daher mehrere Toleranzfelder, die sich im ungünstigsten Fall summieren können. Zum einen weist das Aussenmass des Kernes sowie das Innenmass des Mantels ein Toleranzfeld auf. Zum andern weist das Aussenmass des Mantels ein Toleranzfeld auf und ein solches Toleranzfeld weist auch das Innenmass der Lagerhülse auf, in welcher der Querkraftdorn lagert. Wie bereits erwähnt, können sich all diese Toleranzen summieren. Das so erhaltene Spiel ergibt somit eine gewisse Bewegungsfreiheit in vertikaler Richtung zwischen zwei horizontalen Bauelementen, die mittels Querkraftdornverbindungen miteinander verbunden sind. Die auftretenden Schwingungen im Baukörper führen daher zu Vertikalbewegungen, die zu entsprechender Rissbildung im Bereich der Querkraftdornverbindungen führen.As already mentioned at the beginning, the connection between two horizontal components, which is produced by means of the transverse force mandrels, should practically prevent movements in the vertical direction relative to one another. However, it has been shown that the shear force mandrels of the latter type which are optimal with regard to the material composition cannot adequately meet this condition. Pushing a steel core into a stainless steel jacket requires a certain amount of play. For economic reasons, it is not possible to manufacture all components of a transverse force mandrel connection from calibrated components. And even then a play-free insertion of a core into a jacket is not technically possible. In the known solution, there are therefore several tolerance fields for manufacturing reasons, which can add up in the worst case. On the one hand, the outer dimension of the core and the inner dimension of the jacket have a tolerance field. On the other hand, the outer dimension of the casing has a tolerance field and such a tolerance field also has the inner dimension of the bearing sleeve in which the transverse force mandrel is mounted. As previously mentioned, all of these tolerances can add up. The game thus obtained thus gives a certain freedom of movement in the vertical direction between two horizontal components which are connected to one another by means of transverse force mandrel connections. The vibrations occurring in the building therefore lead to vertical movements, which lead to corresponding crack formation in the Guide the area of the transverse force mandrel connections.

Es ist daher die Aufgabe der vorliegenden Erfindung, ein Verfahren zur Herstellung eines Querkraftdornes bestehend aus einem Stahlkern und einem Mantel aus rostfreiem Stahl zu schaffen, bei dem die derart hergestellten Querkraftdorne die vorgenannten Nachteile weitgehend nicht mehr aufweisen.It is therefore the object of the present invention to provide a method for producing a transverse force mandrel consisting of a steel core and a jacket made of stainless steel, in which the transverse force mandrels produced in this way largely no longer have the aforementioned disadvantages.

Diese Aufgabe löst ein Verfahren mit den Merkmalen des Patentanspruches 1.This object is achieved by a method having the features of patent claim 1.

Führt man während des Einziehens des Stahlkerns in den Mantel eine Kalibrierung des Aussenmasses des Mantels durch, so wird auch das Toleranzfeld zwischen Querkraftdorn und Lagerhülse, in der der Querkraftdorn lagert, reduziert.If the outer dimension of the jacket is calibrated while the steel core is being pulled into the jacket, the tolerance field between the lateral force mandrel and the bearing sleeve in which the lateral force mandrel is stored is also reduced.

Je nach Anwendungsbereich und entsprechenden Anforderungen kann der nach dem obgenannten Verfahren hergestellte Querkraftdorn entweder mit einem Kunststoffpfropfen verschlossen werden oder man kann in die offenen Mantelenden Rondellen aus rostfreiem Stahl einschieben und darin verschweissen.Depending on the area of application and the corresponding requirements, the shear force mandrel produced by the above-mentioned process can either be closed with a plastic plug or stainless steel rondelles can be inserted into the open jacket ends and welded therein.

In der anliegenden Zeichnung ist schematisch der Herstellungsablauf des erfindungsgemässen Verfahrens dargestellt sowie zwei Ausführungsbeispiele des nach diesem Herstellungsverfahren hergestellten Querkraftdornes. Es zeigt:

Figur 1 -
die verschiedenen Schritte der Herstellung von a) bis h) und
Figur 2 -
einen fertigen nach oben gezeigtem Verfahren hergestellten Querkraftdorn mit zwei verschiedenen Ausfertigungen des Endverschlusses.
The attached drawing schematically shows the production sequence of the method according to the invention and two exemplary embodiments of the transverse force mandrel produced using this production method. It shows:
Figure 1 -
the different steps of the preparation from a) to h) and
Figure 2 -
a finished shear force mandrel manufactured according to the method shown above with two different versions of the end closure.

Ausgangsmaterial für die Herstellung eines Querkraftdornes nach dem erfindungsgemässen Verfahren ist einerseits ein Kern 1 bestehend aus einem Stahlstab und andererseits ein Mantel 2 bestehend aus einem Rohr aus rostfreiem Stahl. Der Kern 1 kann dabei aus einem herkömmlichen Baustahl gefertigt sein. Während die nachfolgend zu beschreibenden Schritte a) bis c) meist in entsprechend ausgerüsteten Stahlwerken erfolgen, können die nachfolgenden Schritte d) bis h) in jeder Firma, die technische Bauprodukte herstellt, durchgeführt werden. In den Schritten a) bis c) wird sozusagen das Halbfabrikat gefertigt, während die nachfolgenden Schritte d) bis h) die auftragsspezifische Konfektionierung betreffen.The starting material for the production of a transverse force mandrel according to the method according to the invention is, on the one hand, a core 1 consisting of a steel rod and, on the other hand, a jacket 2 consisting of a stainless steel tube. The core 1 can be made of a conventional structural steel. While the steps a) to c) to be described below mostly take place in appropriately equipped steelworks, the following steps d) to h) can be carried out in any company that manufactures technical construction products. In steps a) to c) the semi-finished product is manufactured, so to speak, while the subsequent steps d) to h) relate to the order-specific assembly.

In einem ersten Schritt a) wird der erwähnte Mantel aus rostfreiem Stahlrohr gemäss bekannter Technologie auf einen entsprechend dimensionierten Stahlstab 1 aufgezogen, so dass der Stahlstab dann den Kern 1 bildet. Beim Enziehverfahren wirkt der Kern 1 selber als Kalibrierdorn, wodurch die angestrebte annähernde Spielfreiheit gewährleistet ist. Je nach Herstellungswerk kann gleichzeitig oder direkt anschliessend das Aussenmass des Mantels aus rostfreiem Stahl kalibriert werden. Rein schematisch ist in Schritt b) mit 20 ein entsprechendes Kalibrierwerkzeug dargestellt. Das Einziehen des Kerns 1 in den Mantel 2 erfolgt mit handelsüblichem Stangenmaterial von mehreren Metern Länge. Das ausserordentlich massgenaue und mindestens annähernd spielfreie Einziehen des Stahlkernes erfolgt mittels Beigabe eines hierzu besonders geeigneten Oeles. Das so erhaltene, in c) dargestellte Halbfabrikat wird an ein Werk für die Fertigung von technischen Bauprodukten geliefert.In a first step a), the aforementioned jacket made of stainless steel pipe is drawn onto a correspondingly dimensioned steel rod 1 according to known technology, so that the steel rod then forms the core 1. In the drawing process, the core 1 itself acts as a calibration mandrel, which means that the desired approximate freedom of play is guaranteed. Depending on the manufacturing plant, the outer dimensions of the stainless steel jacket can be calibrated simultaneously or directly afterwards. In step b), a corresponding calibration tool is shown purely schematically. The core 1 is drawn into the jacket 2 using commercially available rod material of several meters in length. The extremely precise and at least approximately backlash-free pulling in of the steel core is carried out by adding an oil that is particularly suitable for this purpose. The semifinished product thus obtained, shown in c), is delivered to a plant for the manufacture of technical construction products.

Der Empfängerbetrieb des Halbfabrikates längt das Stangenmaterial 3 in entsprechende Stababschnitte 4 ab-Schritt d). Dies wird symbolisch dargestellt durch das Sägeblatt 30. Wie unter e) schematisch angedeutet, wird nunmehr der Kern 1 um eine Distanz a aus dem Mantel 2 hinausgepresst. Dieser vorstehende Abschnitt 5 wird danach bündig dem Mantelende abgetrennt, wie dies f) zeigt. Dank dem beim Einziehen verwendeten Oel lässt sich der Kern 1 mittels entsprechenden hydraulischen Maschinen aus dem Mantel 2 hinauspressen, ohne dass verbleibende Verformungen festgestellt wurden.The receiver operation of the semi-finished product cuts the rod material 3 into corresponding rod sections 4 from step d). This is symbolically represented by the saw blade 30. As indicated schematically under e), the core 1 is now pressed out of the casing 2 by a distance a. This protruding section 5 is then cut off flush with the jacket end, as shown in f). Thanks to the oil used in the drawing-in, the core 1 can be pressed out of the jacket 2 by means of corresponding hydraulic machines without any remaining deformations being found.

Manche Stahlwerken arbeiten beim Einziehen jedoch ohne Beigabe eines Oeles. In diesen Fällen wird man die abgelangten Stababschnitte 4 vor dem Auspressen von aussen kurzzeitig erwärmen, wodurch der Mantel 2 sich mehr aufwärmt als der Kern 1. Dies führt zu minimen Dehnungsdifferenzen, die das Auspressen des Kernes aus dem Mantel erleichtern.However, some steelworks work without adding an oil when pulling in. In these cases, one will be cut off Briefly heat rod sections 4 from the outside before pressing, as a result of which the jacket 2 heats up more than the core 1. This leads to minimal expansion differences, which facilitate the pressing of the core out of the jacket.

Anschliessend an die Abtrennung des ausgestossenen Teiles 5 des Kernes 1 wird mittels derselben hydraulischen Presse von der Seite des abgetrennten Kernes her der Stahlkern 1 diesmal um die halbe Länge des abgetrennten Teiles 5, also um a/2, zurück in den Mantel 1 hineingepresst. Diese Situation ist in der Figur 1 g) dargestellt. Auf diese Weise erhält man einen Stab mit einem Stahlkern 1 und einem Mantel 2, wobei die offenen Mantelenden 6 den Stahlkern 1 beidseitig überragen. Im letzten Arbeitsgang gemäss Figur 1 h) werden nunmehr die offenen Mantelenden 6 verschlossen. So erhält man schliesslich den fertigen Querkraftdorn 10.Subsequent to the separation of the ejected part 5 of the core 1, the steel core 1 is pressed by the same hydraulic press from the side of the separated core, this time by half the length of the separated part 5, i.e. by a / 2, back into the casing 1. This situation is shown in Figure 1 g). In this way, a rod with a steel core 1 and a jacket 2 is obtained, the open jacket ends 6 projecting over the steel core 1 on both sides. In the last step according to FIG. 1 h), the open jacket ends 6 are now closed. This is how you finally get the finished shear force mandrel 10.

In der Figur 2 ist ein erfindungsgemäss hergestellter Querkraftdorn 10 dargestellt. Während die eine Hälfte des Querkraftdornes 10 mit einem Kunststoffpfropfen 7 verschlossen ist, ist das andere Ende mit einer in das offene Mantelende 6 eingelegten Rondelle aus rostfreiem Stahl verschlossen. Für gewisse Anwendungen, insbesondere im Gebäudeinnern, eignen sich Kunststoffpfropfen 7 sehr gut. Die erforderliche Dichtigkeit wird erreicht durch entsprechende Dichtlippen 8 am Kunststoffpfropfen 7. Für Anwendungen mit besonders hoher Tragkraft wird man in das offene Mantelende 6 eine möglichst massgenaue Rondelle 9 aus rostfreiem Stahl einlegen und diese schliesslich mit dem Mantel 2 verschweissen. Je nach gewünschter Dichtigkeit kann die Verschweissung nur punktweise oder als umlaufende Schweissnaht 11 gestaltet sein. Die hierbei etwas erhöhte Festigkeit ergibt sich nicht so sehr durch eine tragende Wirkung der Rondelle 9, sondern vielmehr durch den absolut fixierten Kern 1 im Mantel 2. Dies ergibt eine hochfeste Sandwichkonstruktion.FIG. 2 shows a transverse force mandrel 10 produced according to the invention. While one half of the transverse force mandrel 10 is closed with a plastic plug 7, the other end is closed with a stainless steel rondelle inserted into the open jacket end 6. Plastic plugs 7 are very suitable for certain applications, particularly in the interior of the building. The required tightness is achieved by appropriate sealing lips 8 on the plastic plug 7. For applications with a particularly high load capacity, one is in the open jacket end 6 as possible Insert dimensionally accurate Rondelle 9 made of stainless steel and finally weld them to the jacket 2. Depending on the desired tightness, the welding can be designed only point by point or as a circumferential weld seam 11. The somewhat increased strength does not result so much from a load-bearing effect of the rondelle 9, but rather from the absolutely fixed core 1 in the jacket 2. This results in a high-strength sandwich construction.

Wie die Messresultate erster Versuche gezeigt haben, ist die Festigkeit einer solchen Sandwichkonstruktion höher als bei einem einstückigen Querkraftdorn aus einem Vollstab. Entsprechend kann bei der Dimensionierung auf Querkraftdorne mit kleinerem Durchmesser zurückgegriffen werden. Dies ist nicht nur ein finanzieller Vorteil, sondern führt ebenso zu einer Massreduktion bei der Lagerhülse des Querkraftdornes und damit folglich zu einer erhöhten Betonüberdeckung der Lagerhülse, was abermals baustatische Vorteile hat.As the measurement results of initial tests have shown, the strength of such a sandwich construction is higher than that of a one-piece shear force mandrel made from a solid bar. Accordingly, shear force mandrels with a smaller diameter can be used for dimensioning. This is not only a financial advantage, but also leads to a reduction in the size of the bearing sleeve of the transverse force mandrel and consequently to an increased concrete coverage of the bearing sleeve, which again has structural advantages.

Prinzipiell wird man die Wandstärke des Mantels 2 in einer gewissen Relation zum Durchmesser des Stahlkerns 1 wählen. Generell kann dabei jedoch auf erstaunlich geringe Wandstärken des Mantels zurückgegangen werden. Uebliche Dimensionen der Wandstärke des rostfreien Stahlrohres, aus dem der Mantel 2 gefertigt ist, liegen zwischen 0,4 und 5,0 mm. Die relativ geringe Wandstärke des Mantels 2 aus rostfreiem Stahl bringt selbstverständlich nochmals finanzielle Vorteile.In principle, one will choose the wall thickness of the jacket 2 in a certain relation to the diameter of the steel core 1. In general, however, it can be traced back to surprisingly small wall thicknesses of the jacket. Usual dimensions of the wall thickness of the stainless steel tube from which the jacket 2 is made are between 0.4 and 5.0 mm. The relatively small wall thickness of the casing 2 made of stainless steel naturally brings financial advantages again.

Claims (7)

Verfahren zur Herstellung eines Querkraftdornes bestehend aus einem Stahlkern (1) und einem Mantel (2) aus rostfreiem Stahl, gekennzeichnet durch folgende Schritte: - massgenaues, spielfreies Einziehen eines Stahlkerns (1) bestehend aus einem Stahlstab aus nichtrostfreiem Stahl in einem als Mantel (2) dienenden Rohr aus rostfreiem Stahl; - Ablängung des so gebildeten Stabes in den gewünschten Querkraftdorngrössen; - teilweises Ausstossen des Kernes aus dem Mantel und Abtrennen des ausgestossenen Teiles des Kernes; - Rückstossen des Kernes um die halbe Distanz des ausgestossenen und abgetrennten Teiles; - Verschliessen der offenen Mantelenden. Method for producing a shear force mandrel consisting of a steel core (1) and a casing (2) made of stainless steel, characterized by the following steps: - Dimensionally accurate, play-free retraction of a steel core (1) consisting of a steel rod made of stainless steel in a stainless steel tube serving as a jacket (2); - Cutting the rod thus formed in the desired shear force mandrel sizes; - Partially ejecting the core from the jacket and severing the ejected part of the core; - recoil of the core by half the distance of the ejected and separated part; - Closing the open jacket ends. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die offenen Mantelenden (6) mit einem Kunststoffpfropfen (7) verschlossen werden.A method according to claim 1, characterized in that the open jacket ends (6) are closed with a plastic plug (7). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die offenen Mantelenden (6) mit in die offenen Enden hineingeschobenen Rondellen (9) aus rostfreiem Stahl verschlossen und verschweisst werden.A method according to claim 1, characterized in that the open jacket ends (6) are closed and welded with stainless steel rondelles (9) pushed into the open ends. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während des Einziehens das Aussenmass des Mantels (2) kalibriert wird.A method according to claim 1, characterized in that the outer dimension of the jacket (2) is calibrated during the drawing. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor dem teilweisen Ausstossen des Kernes aus dem Mantel die abgelangten Stäbe kurzzeitig von aussen erwärmt werden.A method according to claim 1, characterized in that before the core is partially ejected from the jacket, the bars which have been cut are briefly heated from the outside. Querkraftdorn hergestellt nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Kern (1) kürzer als der Mantel (2) ist.Shear force mandrel produced according to one of claims 1 to 5, characterized in that the core (1) is shorter than the jacket (2). Querkraftdorn nach Anspruch 5, dadurch gekennzeichnet, dass die Dicke des Mantels (2) aus rostfreiem Stahl zwischen 0,4 und 5,0 mm beträgt.Shear force mandrel according to claim 5, characterized in that the thickness of the casing (2) made of stainless steel is between 0.4 and 5.0 mm.
EP96810578A 1995-09-29 1996-09-03 Method for making a shearload dowel and dowel produced by this method Expired - Lifetime EP0765967B1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
CH2752/95 1995-09-29
CH275295 1995-09-29
AU15026/97A AU729030B2 (en) 1997-02-28 1997-02-28 Method of producing a transverse force bolt and transverse force bolt produced by this method
JP06090097A JP4017700B2 (en) 1995-09-29 1997-03-14 Method for manufacturing inter-component connecting member and inter-component connecting member manufactured by this method
CA002200905A CA2200905A1 (en) 1995-09-29 1997-03-25 Method of producing a transverse force bolt and transverse force bolt produced by this method
CN97104929A CN1194341A (en) 1995-09-29 1997-03-26 Lateral stressed bolt and its producing method
US08/826,140 US5852863A (en) 1995-09-29 1997-03-27 Method of producing a transverse force bolt and transverse force bolt produced by this method

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Publication Number Publication Date
EP0765967A1 true EP0765967A1 (en) 1997-04-02
EP0765967B1 EP0765967B1 (en) 1998-07-08

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EP96810578A Expired - Lifetime EP0765967B1 (en) 1995-09-29 1996-09-03 Method for making a shearload dowel and dowel produced by this method

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EP (1) EP0765967B1 (en)
JP (1) JP4017700B2 (en)
CN (1) CN1194341A (en)
AT (1) ATE168153T1 (en)
CA (1) CA2200905A1 (en)
DE (1) DE59600321D1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999025934A1 (en) 1997-11-17 1999-05-27 Pecon Ag Shear-load chuck holder
US6517277B2 (en) * 1998-09-22 2003-02-11 Kansas State University Research Foundation Expansion and crack joint coupler
CN102941447A (en) * 2012-11-22 2013-02-27 河南航天精工制造有限公司 Manufacture machining process of bolt

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6794688B2 (en) * 2016-07-14 2020-12-02 日本製鉄株式会社 Wall panel connection structure

Citations (2)

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Publication number Priority date Publication date Assignee Title
GB836125A (en) * 1955-05-31 1960-06-01 Vernon Russell Powell Apparatus and method for forming close tolerance tubing and articles therefrom
EP0119652A2 (en) * 1983-03-16 1984-09-26 Heinz Witschi Connection and stress repartition element for concrete parts

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Publication number Priority date Publication date Assignee Title
CH666932A5 (en) * 1987-02-19 1988-08-31 Bau Box Ewiag TENSION OR PRESSURE BAR TO CONNECT TWO CONCRETE PARTS.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB836125A (en) * 1955-05-31 1960-06-01 Vernon Russell Powell Apparatus and method for forming close tolerance tubing and articles therefrom
EP0119652A2 (en) * 1983-03-16 1984-09-26 Heinz Witschi Connection and stress repartition element for concrete parts

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999025934A1 (en) 1997-11-17 1999-05-27 Pecon Ag Shear-load chuck holder
US6471441B1 (en) 1997-11-17 2002-10-29 Pecon Ag Shear-load chuck holder
US6517277B2 (en) * 1998-09-22 2003-02-11 Kansas State University Research Foundation Expansion and crack joint coupler
CN102941447A (en) * 2012-11-22 2013-02-27 河南航天精工制造有限公司 Manufacture machining process of bolt
CN102941447B (en) * 2012-11-22 2015-09-16 河南航天精工制造有限公司 A kind of manufacturing processing technic of bolt

Also Published As

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CN1194341A (en) 1998-09-30
ATE168153T1 (en) 1998-07-15
US5852863A (en) 1998-12-29
DE59600321D1 (en) 1998-08-13
EP0765967B1 (en) 1998-07-08
CA2200905A1 (en) 1998-09-25
JPH10263742A (en) 1998-10-06
JP4017700B2 (en) 2007-12-05

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