EP0122521B1 - Anchor insert for the manipulation of prefabricated elements - Google Patents

Anchor insert for the manipulation of prefabricated elements Download PDF

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Publication number
EP0122521B1
EP0122521B1 EP84103413A EP84103413A EP0122521B1 EP 0122521 B1 EP0122521 B1 EP 0122521B1 EP 84103413 A EP84103413 A EP 84103413A EP 84103413 A EP84103413 A EP 84103413A EP 0122521 B1 EP0122521 B1 EP 0122521B1
Authority
EP
European Patent Office
Prior art keywords
anchor
bends
tie
rod
shaped
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84103413A
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German (de)
French (fr)
Other versions
EP0122521A2 (en
EP0122521A3 (en
Inventor
Peter Ing. Grad. Hoyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PFEIFER SEIL- UND HEBETECHNIK GMBH & CO.
Original Assignee
Pfeifer Seil- und Hebetechnik & Co GmbH
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Filing date
Publication date
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Application filed by Pfeifer Seil- und Hebetechnik & Co GmbH filed Critical Pfeifer Seil- und Hebetechnik & Co GmbH
Priority to AT84103413T priority Critical patent/ATE26009T1/en
Publication of EP0122521A2 publication Critical patent/EP0122521A2/en
Publication of EP0122521A3 publication Critical patent/EP0122521A3/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • E04G21/142—Means in or on the elements for connecting same to handling apparatus

Definitions

  • the invention relates to a transport anchor for precast concrete parts, consisting of a threaded part for connecting the transport anchor to a hoist and a rod-shaped anchor part, which carries the threaded part at one straight end, and has wavy bends in the vicinity of its other end.
  • a transport anchor of the aforementioned type has become known, for example, from DE-A 1 434 518.
  • the transport anchor described in this document consists of rod material which has many bends essentially distributed over its entire length. The radius of the bends becomes smaller and smaller, with the narrowest bend at the inner end of the lifting anchor.
  • the known transport anchor is relatively expensive to manufacture. This is due to the large number of turns and the fact that each turn has a different shape. In particular, when applying the bend with the smallest radius, the application of heat is essential if damage to the rod material due to excessive deformation is to be avoided.
  • the complex manufacture of the known anchor is in conflict with the fact that the anchor is essentially only required once, namely when the precast concrete is transported from the manufacturing site to the installation site.
  • Such an anchor is a consumable part that should be able to be manufactured as cheaply as possible.
  • the invention proposes a transport anchor of the type described in the introduction that the bends obtained by cold deformation consist only of a single shaft with two adjoining arches, the arc adjoining the straight region of the rod-shaped anchor part being relatively short, and the adjoining bow pointing to the other side has a length such that the end of the anchor part projects over the other side of the transport anchor.
  • the arrangement of a single shaft at the inner end of the anchor part ensures that the anchor is not pulled out of the surrounding concrete when the anchor is overloaded, but that an anchor cone is formed by the anchor.
  • the size of this breakout cone is crucial for the transfer of the holding forces.
  • the invention thus eliminates the need to arrange a variety of turns. It is also only necessary to keep the bar length large enough that the breakout cone is of sufficient size. As a result, the manufacturing outlay, namely both the material-related and the processing-related manufacturing outlay, is minimal.
  • the space requirement in the lateral direction is also small in the anchor according to the invention.
  • the anchor can therefore also be arranged in thin precast concrete parts.
  • the bends have a lateral dimension that corresponds approximately to one to two times the diameter of the anchor part.
  • the transport anchor shown consists of the threaded part 10 and the anchor part 9.
  • the threaded part is formed by a continuous sleeve which, in one part, has an internal thread 11 which is used for connection to a hoist.
  • the other part 12 of the inner bore serves for connection to the anchor part 9, which is connected to the threaded part by an external radial pressure.
  • the shown threaded part can also by other threaded parts, for example screw-like designs or similar constructions are replaced.
  • the press connection in the inner bore part 12 is advantageous for the invention, but can also be replaced by other connecting means, for example by welding or the like.
  • the anchor part 9 is made of a straight reinforcing steel rod, which has on its surface the ribs 13, which are obtained, for example, by rolling. As is known per se, the anchoring in the concrete is improved by these ribs 13. However, the invention can also be applied to anchor parts whose outer surface is relatively smooth or which have a different profile. By means of the ribs 15, the connection to the threaded part is also improved.
  • a short curve 5 is formed on the straight region 2 by cold deformation.
  • the associated center of curvature is designated by 15.
  • the short curve 1 is followed by a longer curve 5, the center of curvature of which is designated by 15. In this way, the end 7 reaches the side 8 of the transport anchor, while the main part of the bends 1 runs on the opposite side 4.
  • the end 7 protrudes only slightly onto the side 8, while the bend on the side 4 is approximately one and a half times the diameter of the anchor part. It was found that such a design fully meets all requirements. Of course, it is possible to make the space required on both sides 4 and 8 the same size. However, an additional rod length at the end 7 no longer has any significant advantages since the size of the breakout cone is not significantly improved thereby.
  • the wavy bends are arranged in a single plane, which is generally sufficient for the purposes according to the invention. However, it is also possible to provide the wavy bends in several planes.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Surgical Instruments (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Dowels (AREA)
  • Piles And Underground Anchors (AREA)
  • Lubricants (AREA)

Abstract

The invention relates to an anchor tie member for use in carrying prefabricated concrete components, comprising a threaded portion for connecting the tie member to a lifting device and a tie rod having two end portions the first of which is secured to said threaded portion and the second of which is shaped so as to form at least one undulation therein. The arcuate shapes may be produced by a cold forming method and the presence of the undulation prevents the anchor tie from tearing out of the concrete while it is being transported and ensures a large breakout cone such that considerable forces may be withstood.

Description

Die Erfindung betrifft einen Transportanker für Betonfertigteile, bestehend aus einem Gewindeteil zur Verbindung des Transportankers mit einem Hebezeug und einem stabförmigen Ankerteil, der an seinem einen geraden Ende den Gewindeteil trägt, und in der Nähe seines anderen Endes wellenförmige Abbiegungen aufweist.The invention relates to a transport anchor for precast concrete parts, consisting of a threaded part for connecting the transport anchor to a hoist and a rod-shaped anchor part, which carries the threaded part at one straight end, and has wavy bends in the vicinity of its other end.

Ein Transportanker der vorgenannten Gattung ist beispielsweise bekanntgeworden durch die DE-A 1 434 518. Der in dieser Druckschrift beschriebene Transportanker besteht aus Stangenmaterial, das im wesentlichen über seine ganze Länge verteilt viele Abbiegungen aufweist. Der Radius der Abbiegungen wird dabei fortlaufend kleiner, wobei sich die engste Abbiegung am inneren Ende des Transportankers befindet.A transport anchor of the aforementioned type has become known, for example, from DE-A 1 434 518. The transport anchor described in this document consists of rod material which has many bends essentially distributed over its entire length. The radius of the bends becomes smaller and smaller, with the narrowest bend at the inner end of the lifting anchor.

Bei diesem Transportanker wird offenbar von der Überlegung ausgegangen, daß es wichtig ist, die Kräfte über die ganze Länge des Transportankers verteilt in das Betonfertigteil einzuleiten. Jede der Abbiegungen leitet daher einen Teil der Kräfte in den Beton ein.With this lifting anchor, it is obviously assumed that it is important to distribute the forces into the precast concrete over the entire length of the lifting anchor. Each of the turns therefore transfers some of the forces into the concrete.

Der bekannte Transportanker ist in seiner Herstellung verhältnismäßig aufwendig. Dies ist bedingt durch die Vielzahl der Abbiegungen und durch den Umstand, daß jede Abbiegung eine andere Gestalt besitzt. Insbesondere ist bei der Anbringung der Abbiegung mit dem kleinsten Radius die Anwendung von Wärme unerläßlich, wenn eine Beschädigung des Stabmaterials wegen übermäßiger Verformung vermieden werden soll.The known transport anchor is relatively expensive to manufacture. This is due to the large number of turns and the fact that each turn has a different shape. In particular, when applying the bend with the smallest radius, the application of heat is essential if damage to the rod material due to excessive deformation is to be avoided.

Die aufwendige Herstellung des bekannten Ankers steht im Widerspruch zu dem Umstand, daß der Anker im wesentlichen nur einmal, nämlich beim Transport des Betonfertigteiles von der Herstellungsstelle zur Einbaustelle benötigt wird. Ein derartiger Anker ist ein Verbrauchsteil, das möglichst billig herstellbar sein sollte.The complex manufacture of the known anchor is in conflict with the fact that the anchor is essentially only required once, namely when the precast concrete is transported from the manufacturing site to the installation site. Such an anchor is a consumable part that should be able to be manufactured as cheaply as possible.

Es ist auch bekannt, stabförmige Anker ohne Abbiegungen und in einer solchen Länge zu verwenden, daß eine sichere Kraftübertragung in dem Beton erfolgen kann. Die dafür notwendigen verhältnismäßig großen Stablängen bringen wiederum einen erheblichen Aufwand mit sich. Auch ist es schwierig, für solche Anker die notwendigen Einsatzstellen am Betonfertigteil zu finden.It is also known to use rod-shaped anchors without bends and in such a length that safe power transmission can take place in the concrete. The relatively large rod lengths required for this in turn involve considerable effort. It is also difficult to find the necessary locations on the precast concrete for such anchors.

Es ist auch schon vorgeschlagen worden, bei stabförmigen Ankern am inneren Ende eine tellerartige Verdickung, oder eine hakenartige Umbiegung anzuordnen. Hierdurch läßt sich die erforderliche Stablänge zwar verringern, weil die Halterung im Beton verbessert wird. Die Anordnung einer Verdickung oder einer Umbiegung ist jedoch ebenfalls verhältnismäßig aufwendig. Auch nimmt der Platzbedarf des Ankers in seitlicher Richtung zu, so daß er in dünnwandigen Betonfertigteilen nicht verwandt werden kann.It has also been proposed to arrange a plate-like thickening or a hook-like bend at the inner end of rod-shaped anchors. As a result, the required rod length can be reduced because the mounting in the concrete is improved. However, the arrangement of a thickening or a bend is also relatively expensive. The space requirement of the anchor increases in the lateral direction, so that it cannot be used in thin-walled precast concrete parts.

Es ist Aufgabe der Erfindung, einen Transportanker der eingangs beschriebenen Art derart auszubilden, daß bei möglichst geringem Materialverbrauch und Herstellungsaufwand eine sichere Verbindung des Gewindeteils mit dem Betonfertigteil erhalten wird, daß jedoch der Platzbedarf rechtwinklig zur Längsachse des stabförmigen Ankerteils gering bleibt.It is an object of the invention to design a transport anchor of the type described in the introduction in such a way that a secure connection of the threaded part with the precast concrete part is obtained with the lowest possible material consumption and production expenditure, but that the space requirement perpendicular to the longitudinal axis of the rod-shaped anchor part remains small.

Zur Lösung dieser Aufgabe schlägt die Erfindung einen Transportanker der eingangs beschriebenen Art vor, daß die durch Kaltverformung gewonnenen Abbiegungen nur aus einer einzigen Welle mit zwei aneinander anschließenden Bögen bestehen, wobei der sich an den geraden Bereich des stabförmigen Ankerteils anschließende Bogen verhältnismäßig kurz ist, und der sich daran anschließende, zur anderen Seite weisende Bogen eine solche Länge aufweist, daß das Ende des Ankerteils auf die andere Seite des Transportankers hinüberragt.To achieve this object, the invention proposes a transport anchor of the type described in the introduction that the bends obtained by cold deformation consist only of a single shaft with two adjoining arches, the arc adjoining the straight region of the rod-shaped anchor part being relatively short, and the adjoining bow pointing to the other side has a length such that the end of the anchor part projects over the other side of the transport anchor.

Die Anwendung einer Kaltverformung ist bei der Erfindung deshalb möglich, weil bei der Erfindung auch bei vergleichsweise großen Krümmungsradien eine sichere Verankerung im Betonfertigteil erhalten werden kann.The use of cold forming is possible with the invention because in the invention, even with comparatively large radii of curvature, secure anchoring in the precast concrete part can be obtained.

Die Anordnung einer einzigen Welle am inneren Ende des Ankerteils sorgt dafür, daß bei Überlastung des Ankers nicht der Anker aus dem umgebenden Beton ausgerissen wird, sondern daß durch den Anker ein Ausbruchskegel entsteht. Die Größe dieses Ausbruchskegels ist für die Übertragung der Haltekräfte entscheidend. Die Erfindung spart auf diese Weise die Notwendigkeit, eine Vielzahl von Abbiegungen anzuordnen. Es ist auch nur notwendig, die Stablänge so groß zu halten, daß der Ausbruchskegel eine ausreichende Größe besitzt. Dadurch wird der Herstellungsaufwand, nämlich sowohl der materialmäßige, als auch der bearbeitungsmäßige Herstellungsaufwand minimal.The arrangement of a single shaft at the inner end of the anchor part ensures that the anchor is not pulled out of the surrounding concrete when the anchor is overloaded, but that an anchor cone is formed by the anchor. The size of this breakout cone is crucial for the transfer of the holding forces. The invention thus eliminates the need to arrange a variety of turns. It is also only necessary to keep the bar length large enough that the breakout cone is of sufficient size. As a result, the manufacturing outlay, namely both the material-related and the processing-related manufacturing outlay, is minimal.

Auch der Platzbedarf in seitlicher Richtung ist beim erfindungsgemäßen Anker gering. Der Anker kann daher auch in dünnen Betonfertigteilen angeordnet werden.The space requirement in the lateral direction is also small in the anchor according to the invention. The anchor can therefore also be arranged in thin precast concrete parts.

Es wurde gefunden, daß es bei der Erfindung genügt, wenn die Abbiegungen ein seitliches Maß aufweisen, daß etwa dem ein- bis zweifachen Maß des Durchmessers des Ankerteils entspricht.It has been found that it is sufficient in the invention if the bends have a lateral dimension that corresponds approximately to one to two times the diameter of the anchor part.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt.In the drawing, an embodiment of the invention is shown schematically.

Der gezeigte Transportanker besteht aus dem Gewindeteil 10 und dem Ankerteil 9. Der Gewindeteil ist im gezeigten Ausführungsbeispiel durch eine durchgehende Hülse gebildet, die im einen Teil ein Innengewinde 11 aufweist, das zur Verbindung mit einem Hebezeug dient. Der andere Teil 12 der Innenbohrung dient der Verbindung mit dem Ankerteil 9, das durch eine äußere radiale Pressung mit dem Gewindeteil verbunden ist. Wenn auch die gezeigte Ausbildung des Gewindeteils die vorzugsweise Anwendungsform der Erfindung darstellt, so kann der gezeigte Gewindeteil doch auch durch andere Gewindeteile, beispielsweise schraubenartige Ausbildungen oder ähnliche Konstruktionen ersetzt werden. Die Pressverbindung im Innenbohrungsteil 12 ist für die Erfindung von Vorteil, jedoch ebenfalls durch andere Verbindungsmittel ersetzbar, beispielsweise durch eine Schweißung od.dgl.The transport anchor shown consists of the threaded part 10 and the anchor part 9. In the exemplary embodiment shown, the threaded part is formed by a continuous sleeve which, in one part, has an internal thread 11 which is used for connection to a hoist. The other part 12 of the inner bore serves for connection to the anchor part 9, which is connected to the threaded part by an external radial pressure. Even if the shown design of the threaded part represents the preferred form of application of the invention, the shown threaded part can also by other threaded parts, for example screw-like designs or similar constructions are replaced. The press connection in the inner bore part 12 is advantageous for the invention, but can also be replaced by other connecting means, for example by welding or the like.

Der Ankerteil 9 ist aus einem geraden Betonstahlstab gefertigt worden, der auf seiner Oberfläche die Rippen 13 besitzt, die beispielsweise durch Walzung gewonnen sind. Durch diese Rippen 13 wird, wie an sich bekannt, die Verankerung im Beton verbessert. Die Erfindung kann aber auch bei solchen Ankerteilen angewandt werden, deren Außenfläche relativ glatt ist oder die ein anderes Profil aufweisen. Mittels der Rippen 15 wird auch die Verbindung mit dem Gewindeteil in verbesert.The anchor part 9 is made of a straight reinforcing steel rod, which has on its surface the ribs 13, which are obtained, for example, by rolling. As is known per se, the anchoring in the concrete is improved by these ribs 13. However, the invention can also be applied to anchor parts whose outer surface is relatively smooth or which have a different profile. By means of the ribs 15, the connection to the threaded part is also improved.

Aus dem geraden, stabförmigen Ankerteil, dessen ursprüngliche Gestalt mit strichpunktierten Linien 14 angedeutet ist, ist durch kalte Verformung ein kurzer Bogen 5 an den geraden Bereich 2 angeformt. Der zugehörige Krümmungsmittelpunkt ist mit 15 bezeichnet. An den kurzen Bogen 1 schließt sich ein längerer Bogen 5 an, dessen Krümmungsmittelpunkt mit 15 bezeichnet ist. Auf diese Weise gelangt des Ende 7 auf die Seite 8 des Tranportankers, während der Hauptteil der Abbiegungen 1 auf der gegenüberliegenden Seite 4 verläuft.From the straight, rod-shaped anchor part, the original shape of which is indicated by dash-dotted lines 14, a short curve 5 is formed on the straight region 2 by cold deformation. The associated center of curvature is designated by 15. The short curve 1 is followed by a longer curve 5, the center of curvature of which is designated by 15. In this way, the end 7 reaches the side 8 of the transport anchor, while the main part of the bends 1 runs on the opposite side 4.

Im gezeigten Ausführungsbeispiel ragt das Ende 7 nur knapp auf die Seite 8 hinüber, während die Abbiegung auf der Seite 4 etwa das Eineinhalbfache des Durchmessers des Ankerteils beträgt. Es wurde gefunden, daß eine solche Bauform allen Forderungen voll gerecht wird. Selbstverständlich ist es möglich, den Platzbedarf nach beiden Seiten 4 und 8 gleich groß zu gestalten. Eine zusätzliche Stablänge am Ende 7 bringt jedoch keine wesentlichen Vorteile mehr, da die Größe des Ausbruchkegels hierdurch nicht nennenswert verbessert wird.In the exemplary embodiment shown, the end 7 protrudes only slightly onto the side 8, while the bend on the side 4 is approximately one and a half times the diameter of the anchor part. It was found that such a design fully meets all requirements. Of course, it is possible to make the space required on both sides 4 and 8 the same size. However, an additional rod length at the end 7 no longer has any significant advantages since the size of the breakout cone is not significantly improved thereby.

Im gezeigten Ausführungsbeispiel sind die wellenförmigen Abbiegungen in einer einzigen Ebene angeordnet, was für die erfindungsgemäßen Zwecke in der Regel ausreicht. Es ist aber auch möglich, die wellenförmigen Abbiegungen in mehreren Ebenen vorzusehen.In the exemplary embodiment shown, the wavy bends are arranged in a single plane, which is generally sufficient for the purposes according to the invention. However, it is also possible to provide the wavy bends in several planes.

Claims (2)

1. An anchor tie member for use in carrying prefabricated concrete components, comprising a threaded portion (10) for connecting the tie member to a lifting device and a tie rod (9) having a thread at its linear end portion and undulated- shaped bends (1) close to the other end portion said bends being shaped by cold forming consisting of one single undulation with two neighbouring arcs, said neighbouring arc (5) located next to linear portion (2) of the tie rod (9) is relatively short and the second neighbouring arc (6) directing to the other side (8) has such a length that end portion (7) of the tie rod extends to the other side (8) of the anchor tie member.
2. Anchor tie member according to claim 1 said bends (1) having a lateral dimension being one or two times the diameter of the tie rod (9).
EP84103413A 1983-04-07 1984-03-28 Anchor insert for the manipulation of prefabricated elements Expired EP0122521B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84103413T ATE26009T1 (en) 1983-04-07 1984-03-28 TRANSPORT ANCHOR FOR PRECAST CONCRETE ELEMENTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3312458 1983-04-07
DE19833312458 DE3312458A1 (en) 1983-04-07 1983-04-07 TRANSPORT ANCHORS FOR PRECAST CONCRETE PARTS

Publications (3)

Publication Number Publication Date
EP0122521A2 EP0122521A2 (en) 1984-10-24
EP0122521A3 EP0122521A3 (en) 1985-01-09
EP0122521B1 true EP0122521B1 (en) 1987-03-18

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ID=6195645

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Application Number Title Priority Date Filing Date
EP84103413A Expired EP0122521B1 (en) 1983-04-07 1984-03-28 Anchor insert for the manipulation of prefabricated elements

Country Status (8)

Country Link
US (1) US4655015A (en)
EP (1) EP0122521B1 (en)
AT (1) ATE26009T1 (en)
AU (1) AU568845B2 (en)
DE (2) DE3312458A1 (en)
DK (1) DK157567C (en)
ES (1) ES286973Y (en)
HU (1) HU188619B (en)

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WO2019210968A1 (en) 2018-05-04 2019-11-07 B.T. Innovation Gmbh Transverse force anchor

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Publication number Priority date Publication date Assignee Title
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US11486131B2 (en) 2018-05-04 2022-11-01 B.T. Innovation Gmbh Shear force anchor

Also Published As

Publication number Publication date
DK157567C (en) 1990-06-11
AU568845B2 (en) 1988-01-14
EP0122521A2 (en) 1984-10-24
US4655015A (en) 1987-04-07
DK180484A (en) 1984-10-08
AU2641084A (en) 1984-10-11
DK157567B (en) 1990-01-22
HU188619B (en) 1986-04-28
EP0122521A3 (en) 1985-01-09
ES286973U (en) 1986-01-16
ES286973Y (en) 1986-09-16
DK180484D0 (en) 1984-04-06
ATE26009T1 (en) 1987-04-15
DE3462706D1 (en) 1987-04-23
DE3312458A1 (en) 1984-10-11

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