EP4015732A1 - Élément d'appui pour une pièce préfabriquée en béton armé - Google Patents

Élément d'appui pour une pièce préfabriquée en béton armé Download PDF

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Publication number
EP4015732A1
EP4015732A1 EP21214178.2A EP21214178A EP4015732A1 EP 4015732 A1 EP4015732 A1 EP 4015732A1 EP 21214178 A EP21214178 A EP 21214178A EP 4015732 A1 EP4015732 A1 EP 4015732A1
Authority
EP
European Patent Office
Prior art keywords
reinforced concrete
anchoring
receiving element
concrete part
support
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.)
Pending
Application number
EP21214178.2A
Other languages
German (de)
English (en)
Inventor
Gonca Süleyman
Cornelis-Willem Klop
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 Holding GmbH and Co KG
Original Assignee
Pfeifer Holding GmbH and Co KG
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 Pfeifer Holding GmbH and Co KG filed Critical Pfeifer Holding GmbH and Co KG
Publication of EP4015732A1 publication Critical patent/EP4015732A1/fr
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members

Definitions

  • the invention relates to a support element for a precast reinforced concrete part, which has a steel girder with a support area or a support plate and the steel girder is integrally connected to a receiving element which carries an anchoring element protruding from the steel girder.
  • the invention relates to a precast reinforced concrete part with a support element and a method for producing a support element.
  • Prefabricated reinforced concrete parts with a longitudinal extension are known, which are placed on supporting components such as consoles or on supporting structures such as beams, columns, beams or the like.
  • the above-mentioned support elements are located at the ends of the precast reinforced concrete part and produce a mechanical connection between the precast reinforced concrete part and the supporting structure.
  • a generic support element is from the European patent application EP 685 608 A1 known. This document describes a support element for a prefabricated reinforced concrete part, which has a steel girder with a sleeve welded to its lower chord. An internal thread is cut on the open side of the sleeve.
  • An anchoring element rod which is a reinforcement rod with a welded-on anchor plate, has an external thread at its other end, via which it is screwed into the sleeve. So that a reinforcing bar can be used accordingly, it must first be prepared. In particular, the rod must be upset in one area. Then the ribs typical of the rebar are peeled off on the lateral surface in the area where the thread is to be applied.
  • the invention has set itself the task of proposing a support element whose production is cheaper and which is then easier to assemble on site.
  • the invention is based on a support element, as described above, and proposes that a receiving element is pressed onto the anchoring element.
  • the proposed press connection between the receiving element and the anchoring element increases safety in the production of precast reinforced concrete parts with such supporting elements.
  • the user no longer has to make a screw connection whose tightening torque must be checked with a suitable tool.
  • This proposal achieves the same viability as the prior art.
  • the receiving element is preferably designed as a sleeve.
  • a different body with an outer cross-section instead of a circle, such as a square or a polygon, instead of a pressed-on, rotationally symmetrical sleeve, in which the anchoring element is inserted and fastened in a bore.
  • the type of attachment can be welding or pressing or other form and adhesion. It is crucial that the reinforcement bar is not welded directly onto the steel girder, because this requires very thick and multi-layer weld seams in order to create the frictional connection over the entire surface.
  • the weld seam can be thinner and single-layered because it becomes longer. This means that less heat is introduced and the welding is significantly accelerated
  • the anchoring element is connected to the steel girder via the pressed-on receiving element, preferably by welding. Since the receiving element receives the anchoring element, the connection edge and the connection surface available for the welding are thereby increased. This facilitates the angular connection between the anchoring element and the steel beam.
  • a sleeve had to be welded to the steel girder first. Then an internal thread had to be cut into the sleeve. If a reinforcing bar was used as the anchoring element, it first had to be compressed, chamfered or peeled, i.e. the ribs in the area of the lateral surface that was to protrude into the sleeve had to be removed. After the peeling process, an external thread had to be applied to the rebar, and only then could the rebar be screwed into the internal thread of the sleeve while precisely controlling the tightening torque.
  • the method proposed according to the invention considerably shortens this complex process according to the prior art and therefore makes the production of a support element according to the invention considerably cheaper.
  • a further checking step for the correct rotational alignment of the end anchorage or the anchoring element on the support element is also omitted.
  • the receiving element is pressed onto the anchoring element and only then is the receiving element integrally connected to the pressed-on anchoring element on the steel girder, preferably welded.
  • the invention also encompasses a different method sequence.
  • the invention also includes a solution in which first a receiving element that is also relatively large, i.e. long in relation to the diameter (ratio of length to outer diameter greater than 2.5, preferably greater than 4, particularly preferably greater than 5) is welded onto the steel girder and only then the anchoring element is inserted into the welded-on receiving element and pressed with it.
  • the receiving element is welded to the steel girder or is welded to it.
  • the welding is preferably carried out with a fillet weld (encircling the circumference of the receiving element).
  • a one-piece connection is also made by another joining process such as flash butt welding, laser welding or friction welding.
  • the anchoring element does not protrude as far as the steel girder, less heat is dissipated during welding. At the same time, the lower heat input also minimizes the risk of damage to the cold-formed pressing area and thus misalignment. Furthermore, through the "insulation effect" or the lower heat input due to the arrangement of the free space avoids a temperature-related, negative effect on the press connection.
  • Such a configuration is achieved in that, in the method proposed according to the invention, the receiving element is not pushed completely onto the anchoring element, but rather a free space remains above the end face of the anchoring element in the receiving element.
  • the pressed-on section of the receiving element is as long as or shorter than the insertion length of the anchoring element in the receiving element. It has been found that it is sufficient that a press connection is not necessary over the entire standing length of the anchoring element in the receiving element, but that a smaller part is already sufficient to achieve a stable connection.
  • the standing length is 50-80%, preferably 60-70%, of the axial length.
  • the length of the pressed-on section of the receiving element is approximately 45-75%, preferably 50-60%, of the axial length.
  • the pressed-on section is designed in such a way that the end region of the anchoring element (for example a reinforcing bar) protruding into the receiving element is not pressed.
  • the press connection or the pressed-on section, is preferably located on the side of the receiving element facing away from the steel girder. As a result, the pressing is not directly exposed to the heat input during welding and is thermally protected in particular by the free space. The pressing remains sufficiently mechanically resilient even after welding.
  • the anchoring element is inserted into a bore and fastened, as the receiving element instead of a pressed-on, rotationally symmetrical sleeve.
  • the type of attachment can be welding or pressing or other form and adhesion. It is crucial that the reinforcement bar is not welded directly onto the steel girder, because this requires very thick and multi-layer weld seams in order to create the frictional connection over the entire surface. If there is an intermediate piece between the rebar and the steel beam that has a larger circumference for welding, the weld seam can be thinner and single-layered because it becomes longer. This means that less heat is introduced and the welding is significantly accelerated.
  • the anchoring element is designed as a bar, in particular as a reinforcing bar or as a bar with ribs on the lateral surface.
  • the ribs on the lateral surface of a rebar considerably improve the anchoring of the anchoring element in the concrete of a prefabricated reinforced concrete part.
  • the ribs also significantly improve the hold of the anchoring element in the pressed-on receiving element.
  • the pressing forces used are so high that the material of the receiving element is plastically deformed and rests against the surface of the anchoring element around the ribs, thus resulting in a form-fitting bond, similar to the bond in concrete.
  • the anchoring element has an end anchorage at its end remote from the receiving element.
  • a plate, hook, anchor plate or washer is provided as the end anchorage, for example, which is welded or upset onto the anchoring element.
  • the steel girder has an upper chord and a lower chord and the anchoring element preferably projects at right angles to the lower chord.
  • the anchoring element preferably projects at right angles to the lower chord.
  • the steel girder as a profile product, in particular as an I; T-; Double-; U-; Double U or rectangular profile is formed.
  • the invention is very variable and versatile in the selection of the profile of the steel beam.
  • the steel girder has a longitudinal extension and the support area or the support plate is provided at one end of the longitudinal extension.
  • the proposal advantageously provides for the support plate to be welded to the steel girder, in particular to the bottom chord of the steel girder. This serves to center the load away from the edge in the area of support on the supporting structure, such as a beam or bracket. This avoids force peaks on the edge of a support element. If necessary, the support plate is made wider than the steel girder or the lower chord of the steel girder, in order to reduce the compressive load on the concrete.
  • the support element is designed as a built-in steel part.
  • the steel component is inserted into the formwork and mechanically connected to the other reinforcement elements of the precast reinforced concrete part in a suitable manner.
  • the anchoring element is arranged in a connection area of the steel girder, which is located approximately in the middle of the steel girder.
  • the length of the connection area is preferably about 10-25%, preferably about 12-20% of the length of the support element.
  • the invention also includes a precast reinforced concrete part with a longitudinal extension, with a support element as described above being arranged at least at one longitudinal end of the precast reinforced concrete part, which is held in the precast reinforced concrete part by concreted-in anchoring elements.
  • the advantages described at the outset for the support element proposed according to the invention also relate in an analogous manner to a precast reinforced concrete part according to the invention which is equipped with such a support element.
  • the arrangement is selected in such a way that the support element protrudes laterally beyond the concreted area of the precast reinforced concrete part, but at least the underside of the steel beam protrudes from the precast reinforced concrete part (e.g. if the upper side is concreted over) in order to be able to place it on a supporting structure.
  • the arrangement of the bearing plate ensures that after it has been placed on a support beam, the actual beam of the steel beam is at a distance from the support element and that the steel beam is completely protected against corrosion attacks and is embedded in the concrete and covered by overconcreting and underflow.
  • the anchoring element extends in a web of the precast reinforced concrete part.
  • Prefabricated reinforced concrete parts according to the invention are often realized in a T-like section.
  • the part that is vertically oriented in the installation situation is referred to as the web.
  • the advantages of the invention are fully apparent. Since the end anchoring of the anchoring element is precisely positioned on the steel girder of the support element due to the exact positioning of the anchoring element, thin webs of prestressed single or double T-girders can also be realized with the proposal according to the invention.
  • the correct positioning of the anchoring element that is possible with the invention allows the invention to also be used in prefabricated reinforced concrete parts with narrow tension strand webs.
  • the anchoring element only extends over part of the web height of the precast reinforced concrete part.
  • the support element 1 according to the invention is shown.
  • the steel beam 3 which is designed as profiled goods and has a longitudinal extent 32.
  • the cross-sectional shape of the steel beam 3 is very variable, in figure 1 an I beam is known for this purpose, which has an upper chord 30 and a lower chord 31 .
  • the steel girder 3 has a support area 40, via which the steel girder 3 and the prefabricated reinforced concrete part accommodating the steel girder 3 are supported on a supporting structure (not shown).
  • a support plate 41 is welded onto the underside of the steel girder 3, the bottom chord 31.
  • the weld is marked as a short tack weld with 43.
  • the support plate 41 is preferably welded diagonally to the lower chord 31 .
  • the steel girder 3 has a central axis 38 around which a connecting area 39 extends on both sides. In the direction of the longitudinal extension 32 of the steel girder 3, this connection area 39 has a length of approx. 10-35% of the total length of the support element 1 or the steel girder 3.
  • the central axis 38 coincides with the central axis 78 of the receiving element 7.
  • the receiving element 7 is arranged as a sleeve together with the anchoring element 6 exactly in the middle of the steel girder 3.
  • the anchoring element 6 is designed as a reinforcing bar 62 or reinforcing steel and has a longitudinal extension that is described by the central axis 68 .
  • the reinforcing bar 62 has on its lateral surface 64 a multiplicity of transverse or oblique ribs 63 which, as is customary in concrete construction, result in a bond with the concrete of the precast reinforced concrete part which is as form-fitting as possible.
  • the reinforcing bar 62 projects into the sleeve 7 over a length 61 .
  • the sleeve 7 is pressed onto the anchoring element 6 , here the rod 62 .
  • the central axis 68 of the rebar 62 is aligned with the central axis 78 of the sleeve 7.
  • This pressed area is in figure 1 characterized by the section 71 and is characterized by a reduced outer diameter compared to the section of the sleeve 7, which faces the steel beam 3.
  • the sleeve 7 is on the underside of the steel girder 3, here the bottom chord 31, welded.
  • the weld seam here a circumferential fillet seam, is marked with the reference number 36 .
  • the rebar 62 protrudes only partially into the sleeve 7, i.e. its insertion length 61 is less than the axial sleeve length of the sleeve 7. Therefore, between the end face 60 (or end face) of the rebar 62, which is inserted into the sleeve 7 , a free space 70 to the steel girder 3.
  • This free space 70 improves the overall quality of the weld. Since the reinforcing bar 62 does not protrude to the steel beam 3, less heat is dissipated during the welding and therefore the risk of compression deterioration and deformation and thus misalignment is also minimized at the same time. In the area of free space 70, there is also no compression, i.e. diameter reduction of sleeve 7, which benefits in particular the dimensional stability of sleeve 70 and its end facing steel girder 3, and facilitates the exact alignment of sleeve 7 in the welded joint by fillet weld 36.
  • the pressed-on section 71 of the sleeve 7, as shown here, is shorter than the insertion length 61 of the anchoring element 6, here the reinforcing bar 62.
  • the pressed section 71 extends from that which faces away from the steel girder 3 end of the sleeve 7 in the direction of the steel beam 3.
  • This end anchorage 8 is designed, for example, as a hook, plate, anchor plate or washer.
  • the end anchorage 8 is fastened in a variety of ways to the reinforcement rod 62 or the anchoring element 6, so that it can be subjected to mechanical loads in a stable manner. In figure 1 and 2, for example, a weld with a fillet weld 80 is shown. However, it is also possible to provide a mechanical forming process for fixing the end anchorage 8 on the anchoring element 6 . This includes, for example, upsetting or bending over of the end area of the anchoring element 6. It is also possible to connect the end anchoring by friction welding or flash butt welding.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Rod-Shaped Construction Members (AREA)
EP21214178.2A 2020-12-15 2021-12-13 Élément d'appui pour une pièce préfabriquée en béton armé Pending EP4015732A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020133632.2A DE102020133632A1 (de) 2020-12-15 2020-12-15 Auflageelement für ein Stahlbetonfertigteil

Publications (1)

Publication Number Publication Date
EP4015732A1 true EP4015732A1 (fr) 2022-06-22

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ID=78851230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21214178.2A Pending EP4015732A1 (fr) 2020-12-15 2021-12-13 Élément d'appui pour une pièce préfabriquée en béton armé

Country Status (2)

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EP (1) EP4015732A1 (fr)
DE (1) DE102020133632A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685608A1 (fr) 1994-05-31 1995-12-06 Pfeifer Seil- und Hebetechnik GmbH & Co. Elément de construction préfabriqué en béton armé
DE19943979A1 (de) * 1999-09-14 2001-04-19 Deha Ankersysteme Hülsenstabanker für Betonteile
DE102004038381A1 (de) * 2004-08-06 2006-03-16 Pfeifer Holding Gmbh & Co. Kg Anschlagmittel sowie hülsenartiges Element und Herstellungsverfahren hierfür

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685608A1 (fr) 1994-05-31 1995-12-06 Pfeifer Seil- und Hebetechnik GmbH & Co. Elément de construction préfabriqué en béton armé
DE19943979A1 (de) * 1999-09-14 2001-04-19 Deha Ankersysteme Hülsenstabanker für Betonteile
DE102004038381A1 (de) * 2004-08-06 2006-03-16 Pfeifer Holding Gmbh & Co. Kg Anschlagmittel sowie hülsenartiges Element und Herstellungsverfahren hierfür

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DE102020133632A1 (de) 2022-06-15

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