EP0577857A1 - Elément de construction - Google Patents

Elément de construction Download PDF

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Publication number
EP0577857A1
EP0577857A1 EP92110693A EP92110693A EP0577857A1 EP 0577857 A1 EP0577857 A1 EP 0577857A1 EP 92110693 A EP92110693 A EP 92110693A EP 92110693 A EP92110693 A EP 92110693A EP 0577857 A1 EP0577857 A1 EP 0577857A1
Authority
EP
European Patent Office
Prior art keywords
reinforcement element
reinforcement
concrete
prestressed
tensile
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Withdrawn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
EP92110693A
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German (de)
English (en)
Inventor
Franz Bucher
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP92110693A priority Critical patent/EP0577857A1/fr
Publication of EP0577857A1 publication Critical patent/EP0577857A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • E04C3/26—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 prestressed
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/065—Light-weight girders, e.g. with precast parts

Definitions

  • the invention relates to a component made of reinforced concrete that can be subjected to bending and a method for its production.
  • Such components are known in various designs. In general, two groups can be distinguished, namely components in which a slack reinforcement is arranged and components whose reinforcement is prestressed.
  • Components with prestressed reinforcement can absorb higher loads due to the high-tensile prestressing steel used, although the cross-section of the concrete is a decisive criterion for the load-bearing capacity, since it is stressed by the prestressing forces. Components with prestressed reinforcement are therefore not used where specified concrete cross-sections cannot be increased, for example, ceiling girders and the like, since the higher load-bearing capacity can only be partially used and the production of the components is anyway more difficult due to the necessary clamping devices.
  • At least one prestressed and at least one pressed reinforcement element is provided as reinforcement for the tensile zone
  • components with prestressed reinforcement can be produced with small concrete cross sections, since the pressure absorption capacity of the concrete, which is thus also pressure-reinforced, is increased by more than 50% in this way.
  • Components can thus be produced whose concrete cross-section corresponds to the conventional components reinforced with slack, but whose load-bearing capacity is significantly increased.
  • the load bearing capacity is not to be enlarged, the concrete cross-section should be reduced. The latter is particularly important in the case of ceiling beams and the like, since the transport and assembly weight is reduced, the deflection behavior is improved and larger assembly support distances can be achieved.
  • the load capacity of the component according to the invention is even greater than in the case of prestressed reinforcement by the combination of prestressed and compressed reinforcement alone, since as soon as the tensile forces exceed the prestressing forces, the pressed reinforcement becomes effective as additional tensile reinforcement.
  • a preferred embodiment of such a component provides for the use of sheet metal formwork as a pressed reinforcement element, which is filled with concrete, in which the prestressed reinforcement element runs eccentrically at the lowest possible point.
  • Components according to the invention can be rationally produced by prestressing at least a first reinforcement element of the tensile zone and at least a second reinforcement element of the tensile zone being arranged slack parallel to it, that concrete is poured in, and that after the concrete has hardened, the tensile forces are released, whereupon the components are cut to length will. This can be done, for example, in a fitted bed with a length of several hundred meters.
  • the abscissa shows the strain values in the usual way, and the ordinate shows the stress values ⁇ of a high-tensile, prestressable reinforcement element 2. If the prestressed reinforcement element 2 is concreted in, the origin then shifts A in point B as the origin of a new coordinate system.
  • At least one prestressed reinforcement element 2 which is arranged eccentrically in the tension zone, and at least one pressed reinforcement element 3.
  • the manufacture of such a reinforcement element takes place, for example in a fitted bed, at the two ends of which clamping devices for prestressing each reinforcement element 2 are arranged.
  • the fitted bed preferably has a length of several hundred meters.
  • at least one reinforcement element 3 is furthermore slack, which consists of commercially available reinforcement steel, the tensile strength of which is, for example, one third of the tensile strength of the prestressing steel.
  • the entered tensile force which for example comprises two thirds of the yield strength, is given off to the concrete 1, the pressure absorption capacity of which is considerably increased due to the slack, now pressed reinforcement element 3.
  • the components can now be any or desired Length can be cut. Bars, flat bars etc. are used as slack reinforcement elements 3, whereby, as shown in FIGS. 1 to 3, a reinforcement element 3 can form the concrete formwork.
  • the extended characteristic curve initially applies to the shifted origin B, in which the tensile forces exerted by the tensioning devices in the prestressed reinforcement element 2 are again achieved by the external bending loads, and in which the first pressed reinforcement element 3 is essentially free of forces again.
  • the stress values ⁇ v of the prestressed and the stress values ⁇ s of the slack reinforcement elements therefore correspond to each other, as do the associated strain values.
  • Both reinforcement elements 2, 3 are thus used to absorb the tensile stresses from external stresses. This can be taken into account when calculating the concrete component insofar as the pressed reinforcement can be included as tensile reinforcement.
  • FIGS. 1 to 6 have reinforcement elements 4 in the form of individual bars, single brackets or loop coils, which are provided in the concrete only in the tension zone 1 and which are provided for delivery in in-situ concrete and, if necessary, by additional longitudinal bars which form a top chord. are connected.
  • FIG. 7 shows a precast member with an I cross section, the one above which is the zero plane 6 lying part is also reinforced.
  • a reinforcement element can have a prestress and another reinforcement element 9 can serve as pressure reinforcement.
EP92110693A 1992-06-26 1992-06-26 Elément de construction Withdrawn EP0577857A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92110693A EP0577857A1 (fr) 1992-06-26 1992-06-26 Elément de construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92110693A EP0577857A1 (fr) 1992-06-26 1992-06-26 Elément de construction

Publications (1)

Publication Number Publication Date
EP0577857A1 true EP0577857A1 (fr) 1994-01-12

Family

ID=8209744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92110693A Withdrawn EP0577857A1 (fr) 1992-06-26 1992-06-26 Elément de construction

Country Status (1)

Country Link
EP (1) EP0577857A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2190744A1 (es) * 2001-10-25 2003-08-01 Sanchez Jaime Enrique Jimenez Viga pretensada autoportante para construccion de viviendas y su procedimiento de fabricacion.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH443619A (fr) * 1964-11-25 1967-09-15 Union Tech Interprofessionnell Elément de construction en béton armé et procédé pour sa fabrication
DE1909306A1 (de) * 1969-02-25 1970-09-10 Aloys Bastgen Stahlbetonbalken- und Plattenbalken mit Stahlleichttraegern als Lehrgeruest,Schalung und Bewehrung
AT286583B (de) * 1970-01-23 1970-12-10 Johann Meier Stahlbetonträger
DE2203126B2 (de) * 1972-01-24 1974-02-28 Polensky & Zoellner, 5000 Koeln Verfahren zum Herstellen von Spannbetonbauteilen
DE2626980A1 (de) * 1975-06-19 1977-01-13 Raphael Lipski Traeger aus beton und stahl
BE904131A (fr) * 1986-01-29 1986-05-15 Entpr S Sbbm Et Six Construct Procede de realisation de poutres composees de poutrelles en acier et de beton et poutres obtenues selon ce procede.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH443619A (fr) * 1964-11-25 1967-09-15 Union Tech Interprofessionnell Elément de construction en béton armé et procédé pour sa fabrication
DE1909306A1 (de) * 1969-02-25 1970-09-10 Aloys Bastgen Stahlbetonbalken- und Plattenbalken mit Stahlleichttraegern als Lehrgeruest,Schalung und Bewehrung
AT286583B (de) * 1970-01-23 1970-12-10 Johann Meier Stahlbetonträger
DE2203126B2 (de) * 1972-01-24 1974-02-28 Polensky & Zoellner, 5000 Koeln Verfahren zum Herstellen von Spannbetonbauteilen
DE2626980A1 (de) * 1975-06-19 1977-01-13 Raphael Lipski Traeger aus beton und stahl
BE904131A (fr) * 1986-01-29 1986-05-15 Entpr S Sbbm Et Six Construct Procede de realisation de poutres composees de poutrelles en acier et de beton et poutres obtenues selon ce procede.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2190744A1 (es) * 2001-10-25 2003-08-01 Sanchez Jaime Enrique Jimenez Viga pretensada autoportante para construccion de viviendas y su procedimiento de fabricacion.

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