EP0211256B1 - Anker zum Einbetonieren in schwere Lasten - Google Patents

Anker zum Einbetonieren in schwere Lasten Download PDF

Info

Publication number
EP0211256B1
EP0211256B1 EP86109331A EP86109331A EP0211256B1 EP 0211256 B1 EP0211256 B1 EP 0211256B1 EP 86109331 A EP86109331 A EP 86109331A EP 86109331 A EP86109331 A EP 86109331A EP 0211256 B1 EP0211256 B1 EP 0211256B1
Authority
EP
European Patent Office
Prior art keywords
anchor
saddle
flat
recess
flat bar
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 - Lifetime
Application number
EP86109331A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0211256A2 (de
EP0211256A3 (en
Inventor
Siegfried Fricker
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.)
Halfen & Co unistrut E GmbH KG
Original Assignee
Unistrut Europe PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Unistrut Europe PLC filed Critical Unistrut Europe PLC
Priority to AT86109331T priority Critical patent/ATE62049T1/de
Publication of EP0211256A2 publication Critical patent/EP0211256A2/de
Publication of EP0211256A3 publication Critical patent/EP0211256A3/de
Application granted granted Critical
Publication of EP0211256B1 publication Critical patent/EP0211256B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 an anchor consisting of solid material for concreting into heavy loads, such as precast concrete elements, according to the preamble of patent claim 1.
  • Transport anchors of this type are made of round steel or flat steel.
  • the round steel anchors have a raised round head and a flange-like foot to absorb the forces that occur when lifting.
  • Flat steel anchors have a recess in the head section for coupling the hoist.
  • the base part encased in concrete is provided with spreading lugs, which are formed by cutting the flat material in the base part and by bending apart the legs created by the cutting.
  • the dimensioning of the cross section of this has long been
  • known anchors depend on the size of the resistance moments that occur, because, depending on the load, there must always be a sufficient cross section of the anchor to prevent the spreading lugs from bending back under load and thus preventing the concrete-embedded anchor from being torn out.
  • Round anchors with a widened foot and flat anchors with expansion lugs must also be concreted into the precast concrete with a load-dependent minimum depth.
  • the installation depth of an anchor provided with base-side expansion lugs also depends on the approximately conical shape of the lines of force, which are determined by the saddle load and define the so-called breakout cone for the concrete of the precast element. This breakout cone should be as large as possible on the sides of the precast element to prevent the concrete from breaking out when the precast element is lifted.
  • flat anchors with expansion lugs require a relatively large overall length, since the spreading of the foot caused by separating the flat material affects its strength, especially since the incision must be relatively deep in order to avoid excessive deformation of the legs when bending.
  • two-hole anchors made of flat steel, which are intended to ensure that the load is introduced deeper into a thin precast concrete element (US Pat. No. 4,538,850).
  • the head part of such two-hole anchors is designed like flat anchors.
  • In the foot section there is a round or oval hole through which a so-called additional iron is threaded before concreting in.
  • the hole in the foot part of the two-hole anchor must have a correspondingly large amount of play.
  • the additional iron must have a sufficient length, which can be ten times the anchor length, in order to achieve secure anchoring.
  • the lifting anchor according to the preamble of claim 1 (US-A-4 580 378) consists of a flat iron with a recess provided in the anchor head for coupling the hoist and a round bolt which passes through a recess of the anchor base as an insert.
  • the round bolt is intended to prevent the cast-in anchor from tearing out when the precast concrete element is lifted. Its ends therefore form laterally approaches protruding the cross section of the anchor, the partially cylindrical surfaces of which absorb load forces resulting from the tensile force when the precast concrete element is lifted.
  • the flat anchor can only absorb relatively small load forces, and these lugs have a wedge effect under the tensile force, which can lead to the anchor being torn out under high load and resulting in an outbreak cone which is unfavorable in terms of position and size.
  • a round anchor intended for transporting precast concrete parts is also known (FR-A-2 102 100), which essentially consists of a fully embedded, open-ended sleeve with an internal thread for receiving a lifting element and can be solidly formed on the closed sleeve end. This end is reduced in diameter at the bottom, so that a flat part with its correspondingly large bore can be pushed on there. The flat part then lies with its main plane perpendicular to the axis of the sleeve and is held at its massive lower end in that an annular, aligned with the reduced end portion of the sleeve end extension is expanded like a full rivet.
  • the inserted flat part that completely surrounds the sleeve can absorb loads acting perpendicular to its main plane, which result from the tensile force, but the tensile force is only introduced into the flat part via the widened ring extension of the sleeve.
  • the forces occurring at this connection point can easily lead to a deformation of the ring approach, which engages under the flat part only with a conical widening, so that the flat part can tilt and the anchor sleeve can be pulled out of the bore of the flat part unintentionally when loaded.
  • the invention has for its object to design the flat anchor so that the side approaches can accommodate saddle loads without risk of tearing for the anchor and according to material, size, shape and location with little technical The effort must be adapted to a given load case.
  • the insert part which forms the lugs and is inserted into the recess of the anchor base is deformed in such a way that it is connected to the anchor base in a non-detachable manner and thus the risk of the anchor being torn out of the concrete is reliably prevented.
  • the existing saddle surfaces for the concrete due to the flat design of the lugs can absorb large loads without the lugs being able to detach from the flat iron.
  • These saddle surfaces can be designed to suit the respective load case and aligned with the flat iron, preferably in such a way that they are arranged symmetrically to the longitudinal median plane of the flat iron lying between them.
  • the manufacturing effort is low, since the anchor consists of only two simple parts, the flat iron, which forms the head, shaft and foot of the anchor, can be manufactured by punching and only a plug connection between the flat part and the plug-in part is necessary for assembly is then deformed.
  • the anchor 1 shows a known flat iron anchor 1 made of solid material.
  • the anchor has a head 3 with a recess 3 'for hanging the coupling part of a hoist, a shaft 4 and a foot 5.
  • the foot 5 has lugs 7 in the form of spread legs, which are created by cutting the foot and bending the legs apart.
  • the anchor base is concreted into a prefabricated concrete part 2 with the spread lugs 7; its surfaces facing the anchor head 3 form saddle surfaces 6.
  • the prefabricated concrete part 2 is raised by means of a lifting device acting on the anchor, the tensile forces act in a wedge shape in the concrete mass located above the saddle surfaces 6. This area is called the breakout cone.
  • Fig. 2 shows a well-known round anchor, which is embedded in a relatively thin precast concrete so that the anchor head 3 does not protrude beyond the upper edge 2 'of the precast.
  • a round anchor foot 5 adjoins the concreted-in anchor shaft 4, which forms a round attachment 7, which projects beyond the cross section of the shaft and has a saddle surface 6.
  • the fifth wheel load is distributed on all sides.
  • this has the disadvantage that the saddle forces enter the parallel surfaces 2a of the precast concrete element in a relatively short way.
  • the lines drawn show the relatively large breakout cone that occurs here and directly covers the side walls of the precast concrete part.
  • Embodiments of the anchor according to the invention are shown in FIGS. 3 to 6.
  • FIG. 3 to 3b show a flat iron anchor with anchor head 3 including receiving opening 3 'for the hoist, anchor shaft 4 and anchor base 5 concreted in precast concrete 2.
  • the head, shaft and foot of the anchor consist of a flat iron.
  • the anchor shaft 4 has, at a sufficient distance from its lower edge 10, a recess 8 lying transversely to its narrow sides in the form of a round hole which, like the recess 3 ', is punched out of the flat iron.
  • Fig. 4 shows a similar embodiment.
  • a separate from the flat iron 1 insert T is arranged, which is formed from a round bolt.
  • the insert T has over the cross section of the shaft 4 laterally projecting lugs 7 and 7 'or 7a and 7b, which with the anchor head 3 facing, flat, that is flat, saddle surfaces 6 and 6' or 6a and 6b after insertion of the round bolt are molded in a pressing process.
  • the middle section of this insert part T formed from the round bolt is held immovably in the recess 8 due to the broad, leaf-like design of the saddle surfaces 6 and 6 'or 6a and 6b.
  • a deformation of the lugs 7 and 7 'or 7a and 7b can be provided in such a way that on both sides of the recess 8 there is a compressed, bead-like widening 15 or 15 'is formed, which has the shape of an annular extension at least partially surrounding the recess 8.
  • the projections 7 and 7 'or 7a and 7b which protrude on both sides of the anchor foot 5 can be provided with saddle surfaces 6 and 6' or 6a and 6b, which in their geometric shape and in their inclined position the longitudinal center plane AA of the flat iron can be optimally designed with regard to the acting saddle forces, such that the position and size of the saddle forces and thus also the position and size of the breakup cone can be predetermined.
  • the surfaces 9 and 9 'or 9a and 9b of the lugs opposite the saddle surfaces 6 and 6' or 6a and 6b, ie facing the lower edge 10 of the armature can also be designed as flat, that is, flat surfaces.
  • the saddle surfaces are arranged symmetrically to the longitudinal center plane A-A of the armature lying between them, in order to enable precisely defined, uniform stresses on both sides of the armature 1.
  • each can be manufactured according to size and shape according to the design of the anchor so that the saddle forces can also be predetermined, ie defined.
  • the anchor according to the invention results in a widened, larger saddle surface and thus a considerably lower surface pressure.
  • the saddle surfaces 6 and 6 'or 6a and 6b are each advantageously inclined at an obtuse angle ⁇ with respect to the side surface of the anchor foot 5 parallel to the longitudinal center plane AA (FIGS. 3a and 4).
  • the saddle forces acting as normal forces perpendicular to the saddle surface can be via a larger spatial area and thus distributed over a larger concrete mass, which has a favorable effect when lifting the precast concrete part, since the concrete is less stressable than tensile stress.
  • the lugs 7 and 7 'or 7a and 7b can have in the section going through the longitudinal axis of the flat iron and perpendicular to the longitudinal center plane AA approximately the shape of a right-angled triangle or an approximate trapezoidal shape such that their cross section increases in the direction of the recess 8 and is largest near the recess.
  • the saddle surfaces 6a and 6b are each inclined to the side surface of the anchor foot 5 parallel to the longitudinal center plane A-A at an angle ⁇ which is larger than in the embodiment according to FIG. 3a.
  • the anchor according to the invention can thus be concreted into the precast concrete element with less rigidity and with less installation effort. 4, the anchor according to the invention can therefore have a particularly short overall length, which also results in a corresponding saving in material.
  • the design of the anchor according to the invention is particularly advantageous in the case of relatively narrow or thin precast concrete parts, since the mounting forces that occur can be directed in such a way that the lines of force, unlike in the case of, due to the definable position and shape of the mounting surfaces 6 and 6 'or 6a and 6b 2, run essentially near the longitudinal center plane AA of the anchor and are therefore predominantly in the middle of the narrow precast concrete part. As a result, the stress on the side walls of the precast concrete element shown in FIG. 2 is largely avoided.
  • the anchor in addition to the saddle surfaces 6a and 6b inclined at an angle ⁇ , the surfaces 9a and 9b of the projections 7a and 7b lying opposite them are inclined towards the side surfaces of the anchor foot 5 parallel to the longitudinal center plane AA, the planes of the surfaces 9a and 9b each form an angle ⁇ 'with the longitudinal center plane AA or the side surfaces of the anchor foot 5, which is smaller compared to the angle ⁇ .
  • the anchor can have an overall shorter overall length than the embodiment according to FIG. 3a with the same load capacity.
  • the same overall length corresponding to the larger angle of inclination ⁇ of the saddle surfaces 6a and 6b there is a higher load capacity and thus a functional increase in the installation depth of the armature.
  • an anchor 1 of the embodiment according to FIGS. 3 to 3b is installed in a relatively thin precast element 2.
  • the head 3 of the anchor is recessed into a recess in the precast concrete element, such that its upper edge 2, 2 'lies above the anchor head.
  • the recess 8 into which the round bolt is inserted symmetrically to the anchor foot, in such a way that the lugs 7 and 7 'projecting on both sides of the anchor 1 are of equal length with their saddle surfaces 6 and 6' (see FIG. 3a).
  • the saddle surfaces 6 and 6 ' have a precisely defined position in the prefabricated concrete part 2 and the saddle forces are due to the chosen large inclination of the saddle surfaces (angle ⁇ in Fig. 3a) essentially in the area of the anchor, which means a correspondingly large opening cone in the central area of the precast concrete part is concentrated.
  • the inclination of the saddle surfaces 6 and 6 'or 6a and 6b starting from the recess 8 also has the consequence that the lugs 7 and 7' or 7a and 7b lying transversely to the anchor 1 are subjected to less bending stress in comparison to Approaches whose surface lines of the load-bearing surfaces run at right angles to the longitudinal center plane of the anchor, or in which the saddle surfaces are concave (cf. FIG. 2).
  • 6, 6a and 6b show another embodiment of the flat anchor according to the invention. Instead of a central recess, there are two groove-like recesses 8 'and 8 "in the base 5 of this anchor, which lie opposite each other. One of two projections 7c and 7d, which are part of a deformed, originally square flat iron piece 11, are pressed into these recesses in a form-fitting manner. 6 and 6b), which forms the insert part T.
  • the flat iron piece 11 has a recess 12 which corresponds to the cross-section of the anchor foot 5 before the deformation and is delimited on its longitudinal sides by two middle sections 13 and 13 'of the flat iron piece the insertion and deformation of material of the flat iron piece 11 projecting on all sides beyond the outer contour of the anchor foot 5 forms saddle surfaces 6c, 6d, 6e and 6f.
  • the anchor according to FIGS. 6, 6a and 6b also has the advantage of a definable mounting surface.
  • the saddle surfaces 6c and 6d can be inclined downward, as in the embodiment of FIGS. 3 to 3b. With the alignment shown in FIGS. 6 to 6b perpendicular to the longitudinal center plane of the anchor, it can be achieved that the saddle forces run essentially parallel to the long sides of the precast concrete element, which is particularly useful in the case of narrow components, because forces directed transversely to these long sides, which can cause the precast concrete to break out sideways are largely avoided.
  • the saddle surfaces 6c, 6d, 6e and 6f surround the cross section of the flat iron forming the head, shaft and foot of the flat anchor 1 on all sides, the position and size of the saddle surfaces can be precisely determined depending on the specified load.
  • V-shaped deformation of the insert T in the direction of the lower edge 10 'of the armature in the region of the two opposite central sections 13 and 13' has the further advantage that the load force can be precisely specified in its direction.
  • the manufacture of the anchor according to the invention is simple and inexpensive because of the low material requirement and the simple processing.
  • the recess 8 or the recesses 8 'and 8 "should be at a distance from the lower edge 10 or 10' of the anchor which is sufficient to absorb the tensile forces occurring here with sufficient certainty on the base part of the anchor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Piles And Underground Anchors (AREA)
EP86109331A 1985-07-27 1986-07-08 Anker zum Einbetonieren in schwere Lasten Expired - Lifetime EP0211256B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86109331T ATE62049T1 (de) 1985-07-27 1986-07-08 Anker zum einbetonieren in schwere lasten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853526940 DE3526940A1 (de) 1985-07-27 1985-07-27 Anker zum einbetonieren in schwere lasten
DE3526940 1985-07-27

Publications (3)

Publication Number Publication Date
EP0211256A2 EP0211256A2 (de) 1987-02-25
EP0211256A3 EP0211256A3 (en) 1987-10-28
EP0211256B1 true EP0211256B1 (de) 1991-03-27

Family

ID=6276954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109331A Expired - Lifetime EP0211256B1 (de) 1985-07-27 1986-07-08 Anker zum Einbetonieren in schwere Lasten

Country Status (4)

Country Link
US (1) US4702045A (enrdf_load_stackoverflow)
EP (1) EP0211256B1 (enrdf_load_stackoverflow)
AT (1) ATE62049T1 (enrdf_load_stackoverflow)
DE (2) DE3526940A1 (enrdf_load_stackoverflow)

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DE3904772C1 (enrdf_load_stackoverflow) * 1989-02-17 1990-06-13 Unistrut Europe Plc, Bedford, Gb
FR2649738B1 (fr) * 1989-07-17 1993-06-11 Marcel Arteon Ancre notamment pour panneau de beton
FR2675528B1 (fr) * 1991-04-16 1995-07-07 Arteon Marcel Piece d'ancrage dans le beton arme.
US5596846A (en) * 1995-10-13 1997-01-28 The Burke Group Lifting anchor for embedment in concrete members
US5857296A (en) * 1996-05-16 1999-01-12 Dayton Superior Corporation Concrete sandwich panel erection anchor
US5809703A (en) * 1997-01-15 1998-09-22 Mmi Products, Inc. Slotted insert with increased pull-out capacity
USD398279S (en) 1997-02-07 1998-09-15 Wagner Products Co. Self embedding boat or other applications anchor
USD437063S1 (en) 2000-02-04 2001-01-30 Dayton Superior Corporation Concrete anchor including a pentagonal base
USD438649S1 (en) 2000-02-04 2001-03-06 Dayton Superior Corporation Concrete anchor including an octagonal base
USD437062S1 (en) 2000-02-04 2001-01-30 Dayton Superior Corporation Concrete anchor including a hexagonal base
USD438991S1 (en) 2000-02-04 2001-03-13 Dayton Superior Corporation Concrete anchor including an elliptical base
USD436674S1 (en) 2000-02-04 2001-01-23 Dayton Superior Corporation Concrete anchor
US7032354B2 (en) 2001-12-19 2006-04-25 Universal Form Clamp Co., Inc. Sandwich erection lift anchor with welding plate assembly
US20030213206A1 (en) * 2002-05-01 2003-11-20 Universal Form Clamp Co., Inc. Anchor for embedment in concrete members
US6647674B1 (en) 2002-05-08 2003-11-18 Dayton Superior Corporation Erection anchor for concrete panel
USD520649S1 (en) 2003-02-19 2006-05-09 Universal Form Clamp Co., Inc. Pass through concrete anchor
US7111432B2 (en) * 2003-02-19 2006-09-26 Universal Form Clamp Of Chicago, Inc. Passthrough concrete anchor
USD540657S1 (en) 2003-08-27 2007-04-17 Universal Form Clamp Of Chicago, Inc. W foot anchor
USD547524S1 (en) 2003-08-27 2007-07-24 Universal Form Clamp Of Chicago, Inc. Ring lift anchor
US20050044811A1 (en) * 2003-08-27 2005-03-03 Universal Form Clamp Co., Inc. Ring lift anchor
US20050055958A1 (en) * 2003-08-27 2005-03-17 Universal Form Clamp Co., Inc. W foot anchor
US7065925B2 (en) * 2004-02-11 2006-06-27 Universal Form Clamp Of Chicago, Inc. Concrete anchor
ATE521767T1 (de) * 2004-04-19 2011-09-15 Marcel Arteon Anker zum kippen und heben eines paneels aus härtbarem material, insbesondere beton
US20060248811A1 (en) * 2005-05-04 2006-11-09 Universal Form Clamp Co., Inc. Anchor positioning assembly
EP3009146B1 (en) 2005-06-27 2021-10-20 Pfizer Ireland Pharmaceuticals Immunogenic composition
US8171678B2 (en) * 2009-01-28 2012-05-08 Actuant Corporation Slab lift bracket
DK2940227T3 (da) * 2014-04-30 2021-07-26 Technische Hochschule Mittelhessen Flad komponent, tværkraftarmeringselement samt stålbeton-/ forspændbetonkomponent med en tværkraftarmering af sådanne tværkraftarmeringselementer
US9353535B2 (en) * 2014-06-19 2016-05-31 Mark A Borchardt Space saving anchor point for a concrete structure
US9359779B2 (en) * 2014-11-05 2016-06-07 Mark A. Borchardt Space saving anchor point for a concrete structure
US11549273B2 (en) * 2017-08-10 2023-01-10 ALP Supply, Inc. Lift anchor for precast concrete component
US11421431B1 (en) 2019-02-21 2022-08-23 ALP Supply, Inc. Erection anchor with coil legs
USD1022259S1 (en) * 2021-06-07 2024-04-09 Illinois Tool Works Inc. Anchor
USD1010160S1 (en) * 2021-07-14 2024-01-02 Illinois Tool Works Inc. Anchor
AU2021205063A1 (en) 2021-07-14 2023-02-02 Illinois Tool Works Inc. Anchor
US12247409B2 (en) * 2022-01-25 2025-03-11 ALP Supply, Inc. Lifting pin anchor with annular plate

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Also Published As

Publication number Publication date
EP0211256A2 (de) 1987-02-25
DE3678355D1 (de) 1991-05-02
US4702045A (en) 1987-10-27
DE3526940C2 (enrdf_load_stackoverflow) 1988-10-20
EP0211256A3 (en) 1987-10-28
ATE62049T1 (de) 1991-04-15
DE3526940A1 (de) 1987-02-12

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