EP0051769A1 - Anchor for concrete - Google Patents

Anchor for concrete Download PDF

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Publication number
EP0051769A1
EP0051769A1 EP81108675A EP81108675A EP0051769A1 EP 0051769 A1 EP0051769 A1 EP 0051769A1 EP 81108675 A EP81108675 A EP 81108675A EP 81108675 A EP81108675 A EP 81108675A EP 0051769 A1 EP0051769 A1 EP 0051769A1
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EP
European Patent Office
Prior art keywords
anchor
area
concrete
flat steel
precast concrete
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.)
Withdrawn
Application number
EP81108675A
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German (de)
French (fr)
Inventor
Siegfried Fricker
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Individual
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Individual
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Publication date
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Publication of EP0051769A1 publication Critical patent/EP0051769A1/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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/388—Separate connecting elements

Definitions

  • the invention relates to a concrete anchor made of a flat steel part for precast concrete parts with an anchoring area in the precast concrete part and a connection area lying in the surface area of the precast concrete part.
  • Such an anchor is known as a set-up and transport anchor from DE-AS 27 04 435.
  • the anchoring area is designed in such a way that the lower end of the anchor is slotted in the middle and the two halves are bent apart in opposite directions, so that expansion legs are created.
  • the object of the invention is to improve its load-bearing capacity without increasing the manufacturing outlay.
  • the anchoring area is formed from a hook-like, alternate bend at the end of the flat steel part from the longitudinal direction of the anchor, so that at least two support areas lying essentially transverse to the direction of stress are created on both sides of the longitudinal axis of the anchor.
  • the loading point is at the same tie-in depth of the anchor in this embodiment of the anchoring area lower than in the above-mentioned anchor according to the prior art of the technique.
  • the distance between the stress point and the surface of the precast concrete element is included in the calculation of the load-bearing capacity of an anchor.
  • the offset of the load areas in the tie-in depth also leads to a favorable distribution of the load.
  • the supporting areas running according to the invention also allow a better introduction of force into the surrounding concrete of the precast concrete element (reduction of splitting tensile stress) while at the same time lower surface pressure, since compared to the anchor according to the prior art, the supporting area has twice the anchoring area (in the projection direction) and in that of the Anchor side immediately adjacent area, which is crucial for the load-bearing capacity.
  • An embodiment of the invention provides that the curvature of the flat steel part in the anchoring area is selected such that a reinforcing bar can be inserted.
  • This configuration enables a far-reaching introduction of force into the precast concrete part and thus improves the structural properties of the anchor.
  • Another embodiment provides that the end face of the end of the anchoring area has a complementary shape to the end face of the end of the connection area. This has the advantage that no material loss occurs, since several anchors can be separated from a corresponding flat steel rod by a cutting tool.
  • the design according to the invention of the anchoring area of the anchor means that there are no restrictions for the required design of the coupling area as it is is proposed for example in the above-mentioned DE-AS.
  • the anchor 10 consists of a flat steel part which is embedded in a prefabricated concrete part 20.
  • it essentially consists of a connection area protruding from this precast concrete part 20 and an anchoring area lying in the precast concrete part 20.
  • This anchoring area is designed according to the invention so that two support areas 11 and 12 are formed, which lie on both sides of the anchor axis aa and take the load of the precast concrete part 20. It has been shown that the point of maximum stress on the concrete lies approximately at the level of the lower supporting area 12, and thus reaches the lowest point imaginable, in other words: practically the entire embedment depth L of the anchor 10 can be included in corresponding calculations for the dimensioning of the load-bearing capacity.
  • this hook-like bend in the anchoring area can be carried out in one operation simply by cold working the flat steel part.
  • a reinforcing bar 15 is inserted into the inner curvature of the resulting hook.
  • the maximum lateral dimensions x and y of the two treg regions 11 and 12 are selected to be of the same size (exemplary embodiment in FIGS. 1 and 2).
  • the coupling area of the anchor in question has a roof-shaped configuration or a configuration such as is given in the above-mentioned DE-AS, it is advantageous to give the negative shape of the end face 14 of the coupling area to the end face 13 of the anchoring area, since then only one Cutting tool to separate the anchors from a flat steel rod is required.
  • the total length of the armature 10 can then be determined such that the projection area of the two support areas 11 and 12 are of the same size despite the specially shaped end faces 13.
  • the anchor according to the invention thus combines the advantages of simplest manufacture with a favorable load-bearing capacity.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

A concrete anchor made of flat-steel iron is bent in a hook-like manner at its lower end, specifically so that two supporting regions (11, 12) arranged transversely to the direction of stress are obtained symmetrically in relation to the longitudinal axis of the concrete anchor. This design results in a high supporting capacity in relation to the bonding depths of the anchor (Fig. 1). <IMAGE>

Description

Die Erfindung betrifft einen Betonanker aus einem Flachstahlteil für Betonfertigteile mit einem Verankerungsbereich im Betonfertigteil und einem im Oberflächenbereich des Betonfertigteils liegenden Anschlußbereich.The invention relates to a concrete anchor made of a flat steel part for precast concrete parts with an anchoring area in the precast concrete part and a connection area lying in the surface area of the precast concrete part.

Ein derartiger Anker ist als Aufstell- und Transportanker aus der DE-AS 27 04 435 bekannt. Dort ist der Verankerungsbereich derart ausgebildet, daß das untere Ende des Ankers mittig geschlitzt und die beiden Hälften gegenläufig auseiaandergebogen sind, sodaß Spreizschenkel entstehen.Such an anchor is known as a set-up and transport anchor from DE-AS 27 04 435. There, the anchoring area is designed in such a way that the lower end of the anchor is slotted in the middle and the two halves are bent apart in opposite directions, so that expansion legs are created.

Gegenüber diesem bekannten Anker hat die Erfindung zur Aufgabe, dessen Tragfähigkeit ohne Erhöhung des Herstellungsaufwandes zu verbessern.Compared to this known anchor, the object of the invention is to improve its load-bearing capacity without increasing the manufacturing outlay.

Dies löst die Erfindung dadurch, daß der Verankerungsbereich aus einer hakenartigen, wechselseitigen Abbiegung am Ende des Flachstahlteils aus der Längsrichtung des Ankers gebildet ist, sodaß mindestens zwei im wesentlichen quer zu Beanspruchungsrichtung liegende Tragbereiche beidseitig der Längsachse des Ankers entstehen. Infolge des im wesentlichen quer zur Beanspruchungsrichtung verlaufenden Tragbereichsliegt der Beanspruchungspunkt bei gleicher Einbindetiefe des Ankers bei dieser Ausgestaltung des Verankerungsbereichs tiefer als beim oben genannten Anker gemäß dem Stand der Technik. Der Abstand des Beanspruchungspunktes zur Oberfläche des Betonfertigteils geht aber im Quadrat in die Berechnung der Tragfähigkeit eines Ankers ein.This is achieved by the invention in that the anchoring area is formed from a hook-like, alternate bend at the end of the flat steel part from the longitudinal direction of the anchor, so that at least two support areas lying essentially transverse to the direction of stress are created on both sides of the longitudinal axis of the anchor. As a result of the supporting area running essentially transversely to the direction of loading, the loading point is at the same tie-in depth of the anchor in this embodiment of the anchoring area lower than in the above-mentioned anchor according to the prior art of the technique. However, the distance between the stress point and the surface of the precast concrete element is included in the calculation of the load-bearing capacity of an anchor.

Die Versetzung der Tragbereiche in der Einbindetiefe führt außerdem zu einer günstigen Aufteilung der Traglast.The offset of the load areas in the tie-in depth also leads to a favorable distribution of the load.

Die erfindungsgemäß verlaufenden Tragbereiche gestatten auch eine bessere Krafteinleitung in den umgebenden Beton des Betonfertigteils (Verringerung von Spaltzugbeanspruchung) bei gleichzeitig geringerer Flächenpressung, da gegenüber dem Anker gemäß dem Stand der Technik der Tragbereich insgesamt die doppelte Verankerungsfläche (in Projektionsrichtung) aufweist und zwar in dem der Ankerseite unmittelbar benachbarten Bereich, der für die Tragfähigkeit entscheidend ist.The supporting areas running according to the invention also allow a better introduction of force into the surrounding concrete of the precast concrete element (reduction of splitting tensile stress) while at the same time lower surface pressure, since compared to the anchor according to the prior art, the supporting area has twice the anchoring area (in the projection direction) and in that of the Anchor side immediately adjacent area, which is crucial for the load-bearing capacity.

Eine Ausgestaltung der Erfindung sieht vor, daß die Krümmung des Flachstahlteils im Verankerungsbereich derart gewählt ist, daß ein Bewehrungsstab eingelegt werden kann.An embodiment of the invention provides that the curvature of the flat steel part in the anchoring area is selected such that a reinforcing bar can be inserted.

Diese Ausgestaltung ermöglicht eine weitreichende Krafteinleitung in das Betonfertigteil und verbessert damit die Trageingeschaften des Ankers.This configuration enables a far-reaching introduction of force into the precast concrete part and thus improves the structural properties of the anchor.

Eine weitere Ausgestaltung sieht vor, daß die Stirnseite des Endes des Verankerungsbereichs eine komplementäre Form zur Stirnseite des Endes des Anschlußbereichs hat. Dies hat den Vorteil, daß keinerlei Materialverlust entsteht, da mehrere Anker durch ein Schnittwerkzeug von einem entsprechenden Flachstahlstab abgetrennt werden können. Die erfindungsgemäße Ausgestaltung des Verankerungsbereichs des Ankers bedeutet, also keinerlei Einschränkungen für die erforderliche Ausgestaltung des Kupplungsbereichs, wie sie beispielsweise in der oben genannten DE-AS vorgeschlagen ist.Another embodiment provides that the end face of the end of the anchoring area has a complementary shape to the end face of the end of the connection area. This has the advantage that no material loss occurs, since several anchors can be separated from a corresponding flat steel rod by a cutting tool. The design according to the invention of the anchoring area of the anchor means that there are no restrictions for the required design of the coupling area as it is is proposed for example in the above-mentioned DE-AS.

Die Verwendung von Flachmaterial bringt im übrigen gegenüber anderen bekannten Ankern, die aus anderen Profilmaterialien gefertigt sind, den Vorteil der leichteren Verarbeitung.The use of flat material brings the advantage of easier processing compared to other known anchors that are made of other profile materials.

Zwei Ausführungsbeispiele werden nun anhand von Figuren näher erläutert. Es zeigen:

  • Figur 1 einen Längsschnitt durch ein erstes Ausführungsbeispiel des Ankers,
  • Figur 2 eine Draufsicht in Richtung des Pfeiles A der Figur 1 auf dieses erste Ausführungsbeispiel des Ankers und
  • Figur 3 eine Draufsicht auf ein zweites Ausführungsbeispiel des Ankers mit komplementär ausgebildeten Stirnseiten.
Two exemplary embodiments are now explained in more detail with reference to figures. Show it:
  • FIG. 1 shows a longitudinal section through a first exemplary embodiment of the armature,
  • Figure 2 is a plan view in the direction of arrow A of Figure 1 of this first embodiment of the anchor and
  • Figure 3 is a plan view of a second embodiment of the anchor with complementary end faces.

Der erfindungsgemäße Anker 10 besteht aus einem Flachstahlteil, das in einem Betonfertigteil 20 eingebettet ist. Er besteht bei den gewählten Ausführungsbeispielen im wesentlichen aus einem aus diesem Betonfertigteil 20 herausragenden Anschlußbereich und einem im Betonfertigteil 20 liegenden Verankerungsbereich.The anchor 10 according to the invention consists of a flat steel part which is embedded in a prefabricated concrete part 20. In the selected exemplary embodiments, it essentially consists of a connection area protruding from this precast concrete part 20 and an anchoring area lying in the precast concrete part 20.

Dieser Verankerungsbereich ist erfindungsgemäß so ausgebildet, daß zwei Tragbereiche 11 und 12 entstehen, die beidseitig der Ankerachse a-a liegen und die Last des Betonfertigteils 20 aufnehmen. Es hat sich gezeigt, daß der Punkt maximaler Beanspruchung des Betons etwa in Höhe des unteren Tragbereichs 12 liegt, und damit den denkbar tiefsten Punkt erreicht, anders ausgedrückt: praktisch die gesamte Einbindetiefe L des Ankers 10 kann für die Dimensionierung der Tragfähigkeit in entsprechende Berechnungen einbezogen werden.This anchoring area is designed according to the invention so that two support areas 11 and 12 are formed, which lie on both sides of the anchor axis aa and take the load of the precast concrete part 20. It has been shown that the point of maximum stress on the concrete lies approximately at the level of the lower supporting area 12, and thus reaches the lowest point imaginable, in other words: practically the entire embedment depth L of the anchor 10 can be included in corresponding calculations for the dimensioning of the load-bearing capacity.

Die Herstellung dieser hakenartigen Abbiegung im Verankerungsbereich ist einfach durch Kaltverformung des Flachstahlteils in einem Arbeitsgang durchführbar. Für besondere Anwendungsbereiche, z.B. Beton mit geringerer Festigkeit als üblich, ist in die Innenkrümmung des entstandenen Hakens ein Bewehrungsstab 15 eingelegt.The production of this hook-like bend in the anchoring area can be carried out in one operation simply by cold working the flat steel part. For special areas of application, e.g. Concrete with lower strength than usual, a reinforcing bar 15 is inserted into the inner curvature of the resulting hook.

Zur Erreichung eines statischen Gleichgewichtes sind die maximalen seitlichen Ausdehnungen x und y der beiden Tregbereiche 11 und 12 gleich groß gewählt (Ausführungsbeispiel der Figuren 1 und 2).To achieve a static equilibrium, the maximum lateral dimensions x and y of the two treg regions 11 and 12 are selected to be of the same size (exemplary embodiment in FIGS. 1 and 2).

Wenn der Kupplungsbereich des betreffenden Ankers jedoch eine dachförmige Ausgestaltung hat oder eine Ausgestaltung, wie sie bei der oben genannten DE-AS gegeben ist, ist es vorteilhaft, die Negativform der Stirnseite 14 des Kupplungsbereiches der Stirnseite 13 des Verankerungsbereichs zu geben, da dann lediglich ein Schneidwerkzeug zu Abtrennen der Anker aus einem Flachstahlstab erforderlich ist. In diesem Fall kann dann die Gesamtlänge des Ankers 10 so bestimmt werden, daß die Projektionsfläche der beiden Tragbereiche 11 und 12 trotz der speziell geformten Stirnseiten 13 gleich groß sind. Der erfindungsgemäße Anker vereinigt also in sich die Vorzüge einfachster Herstellung mit günstiger Tragfähigkeit.However, if the coupling area of the anchor in question has a roof-shaped configuration or a configuration such as is given in the above-mentioned DE-AS, it is advantageous to give the negative shape of the end face 14 of the coupling area to the end face 13 of the anchoring area, since then only one Cutting tool to separate the anchors from a flat steel rod is required. In this case, the total length of the armature 10 can then be determined such that the projection area of the two support areas 11 and 12 are of the same size despite the specially shaped end faces 13. The anchor according to the invention thus combines the advantages of simplest manufacture with a favorable load-bearing capacity.

Claims (5)

1. Betonanker aus einem Flachstahlteil für Betonfertigteile mit einem Verankerungsbereich im Betonfertigteil und einem im Oberflächenbereich des Betonfertigteils liegenden Anschlußbereich, dadurch gekennzeichnet, daß der Verankerungsbereich aus einer hakenartigen, wechselseitigen Abbiegung am Ende des Flachstahlteils aus der Längsrichtung (a-a) des Ankers (10) gebildet ist, sodaß mindestens zwei im wesentlichen quer zur Beanspruchungsrichtung liegende Tragbereiche (11,12) beidseitig der Längsachse (a-a) des Ankers (10) entstehen.1. Concrete anchor made of a flat steel part for precast concrete parts with an anchoring area in the precast concrete part and a connection area lying in the surface area of the precast concrete part, characterized in that the anchoring area is formed from a hook-like, alternating bend at the end of the flat steel part from the longitudinal direction (aa) of the anchor (10) , so that at least two support regions (11, 12) lying essentially transversely to the direction of stress arise on both sides of the longitudinal axis (aa) of the armature (10). 2. Betonanker nach Anspruch 1, dadurch gekennzeichnet, daß die Krümmung des Flachstahlteils im Verankerungsbereich derart gewählt ist, daß ein Bewehrungsstab (15) eingelegt werden kann.2. Concrete anchor according to claim 1, characterized in that the curvature of the flat steel part in the anchoring area is selected such that a reinforcing bar (15) can be inserted. 3. Betonanker nach Anspruch 1, dadurch gekennzeichnet, daß die maximale seitliche Ausdehnung (x,y) der beiden Tragbereiche (11,12) gleich groß ist.3. Concrete anchor according to claim 1, characterized in that the maximum lateral extent (x, y) of the two support areas (11, 12) is the same size. 4. Betonanker nach Anspruch 1, dadurch gekennzeichnet, daß die Stirnseite (13) des Endes des Verankerungsbereichs eine komplementäre Form zur Stirnseite (14) des Endes des Anschlußbereichs hat.4. Concrete anchor according to claim 1, characterized in that the end face (13) of the end of the anchoring area has a complementary shape to the end face (14) of the end of the connection area. 5. Betonanker nach Anspruch 1, dadurch gekennzeichnet, daß er als Aufstell- und Transportanker ausgebildet ist, bei dem der Anschlußbereich eine Öffnung zum Durchgriff eines Hebezeuges oder Kupplungskopfes aufweist.5. Concrete anchor according to claim 1, characterized in that it is designed as a set-up and transport anchor in which the connection area has an opening for the passage of a hoist or coupling head.
EP81108675A 1980-11-10 1981-10-22 Anchor for concrete Withdrawn EP0051769A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803042329 DE3042329A1 (en) 1980-11-10 1980-11-10 CONCRETE ANCHOR
DE3042329 1980-11-10

Publications (1)

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EP0051769A1 true EP0051769A1 (en) 1982-05-19

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EP81108675A Withdrawn EP0051769A1 (en) 1980-11-10 1981-10-22 Anchor for concrete

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EP (1) EP0051769A1 (en)
JP (1) JPS5789042A (en)
KR (1) KR830007991A (en)
DE (1) DE3042329A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878596A1 (en) * 1997-05-13 1998-11-18 Heinz-Werner Hermanns Transport anchor embedded in porous-concrete panels

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3904772C1 (en) * 1989-02-17 1990-06-13 Unistrut Europe Plc, Bedford, Gb
KR100916672B1 (en) * 2008-08-08 2009-09-08 국제산업렌탈 (주) Mast fixation of construction lift embed anchor and spatial-temporal method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1487283A (en) * 1965-07-24 1967-06-30 Device for handling concrete elements, in particular prefabricated elements for walls, floors and ceilings
AU3259868A (en) * 1968-12-10 1970-06-18 Guest, Keen & Nettlefolds (Aust. Limited Anchorages for use inform moulded concrete articles
FR2159706A5 (en) * 1971-11-09 1973-06-22 Lenne Marcel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS525092Y2 (en) * 1973-05-28 1977-02-02

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1487283A (en) * 1965-07-24 1967-06-30 Device for handling concrete elements, in particular prefabricated elements for walls, floors and ceilings
AU3259868A (en) * 1968-12-10 1970-06-18 Guest, Keen & Nettlefolds (Aust. Limited Anchorages for use inform moulded concrete articles
FR2159706A5 (en) * 1971-11-09 1973-06-22 Lenne Marcel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878596A1 (en) * 1997-05-13 1998-11-18 Heinz-Werner Hermanns Transport anchor embedded in porous-concrete panels

Also Published As

Publication number Publication date
DE3042329A1 (en) 1982-06-03
KR830007991A (en) 1983-11-09
JPS5789042A (en) 1982-06-03

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