EP1307326B1 - Dalle creuse en beton precontraint et son procede de fabrication - Google Patents

Dalle creuse en beton precontraint et son procede de fabrication Download PDF

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Publication number
EP1307326B1
EP1307326B1 EP01964841A EP01964841A EP1307326B1 EP 1307326 B1 EP1307326 B1 EP 1307326B1 EP 01964841 A EP01964841 A EP 01964841A EP 01964841 A EP01964841 A EP 01964841A EP 1307326 B1 EP1307326 B1 EP 1307326B1
Authority
EP
European Patent Office
Prior art keywords
concrete
cavities
slabs
strands
hollow
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
EP01964841A
Other languages
German (de)
English (en)
Other versions
EP1307326A2 (fr
Inventor
Alfred WELLHÖFER
Gerhard Rindle
Thomas Rieger
Rudolf Gerhards
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.)
Finger Immobilien & Co KG GmbH
Original Assignee
Finger Immobilien & Co KG GmbH
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Publication date
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Publication of EP1307326A2 publication Critical patent/EP1307326A2/fr
Application granted granted Critical
Publication of EP1307326B1 publication Critical patent/EP1307326B1/fr
Anticipated expiration legal-status Critical
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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
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/012—Discrete reinforcing elements, e.g. fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/523—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement containing metal fibres
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
    • E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
    • E04B5/043—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement having elongated hollow cores

Definitions

  • the present invention relates to a prestressed concrete hollow slab and a method for producing a prestressed concrete slab in which a plurality of strands between spaced brackets are clamped individually or in groups parallel to each other and wrapped in concrete by extrusion, wherein extending parallel to the strands extending cavities between the concrete Strands remain.
  • the hollow concrete slabs produced by such a method consist of a top chord, a bottom chord and webs extending between the bottom chord and the top chord, each delimiting parallel extending cavities, wherein prestressed strands are arranged parallel to the voids in the concrete material, the strands being extruded during extrusion Betons are embedded in these.
  • a corresponding method for producing hollow concrete slabs and also the hollow concrete slabs produced therefrom are known from US Pat. No. 4,067,676.
  • the hollow concrete slabs made therefrom are simply made by cutting to length sections of the total one piece slab.
  • These plates are manufactured in plants in which the holders for tensioning the strands are spaced very far from e.g. 100 or 120 m and a corresponding extruding machine, which has a bucket for receiving concrete, travels along the tensioned strands and extrudes the concrete so that the strands are thereby embedded in certain desired cross-sectional areas, in the concrete, the extrusion openings are provided with tubes or pins which define the cavity cross-sections and are moved along with the machine, the machine leaves the extruded plate cross-section and the plate finally extends substantially between the two jigs.
  • the concrete in this case must have a very high viscosity and a very pronounced green strength, that is, he must already have a sufficient dimensional stability when pressed out of the extrusion, so that the plate cross-section, including the flat upper and lower surfaces and the cavity cross sections remain and the plate is not deformed or at best in a precisely controllable manner subsequently.
  • the concrete After extruding, the concrete must finally cure before the strands can be separated at the two ends of the thus prepared, approximately 100 to 120 m long cavity plate. After hardening of the concrete, the strands remain in the prestressed state due to their firm connection with the concrete material.
  • the long extruded sheets are cut to lengths of a desired length for a specific construction project, usually on the order of a few meters and up to 15 m, and to form a ceiling or a floor, the panels are placed side by side on supporting walls. Foundations or carriers launched. Since the plates have a slightly trapezoidal cross-section in such a way that the top chord between 2 and 5 cm is narrower than the bottom chord, when laying the plates, only the bottom chords along the longitudinal edges of adjacent plates abut each other and the gap formed therebetween with concrete, mortar or another binder or grout filled.
  • these plates have the disadvantage of only a low load capacity in the event of loads in the transverse direction and, in particular, they can not be loaded dynamically, ie they are not suitable for driving on vehicles with fork-lift trucks or for setting up machines which generate vibrations. Because of the low Quertragest the plates can be produced only in maximum widths of about 1.2 m. This impairs the economics inherent in the use of such panels in the manufacture of corresponding buildings, as there are accordingly more joints to be filled between the side-by-side panels, which is relatively labor intensive.
  • US Pat. No. 5,798,151 discloses a method and an apparatus for producing hydraulically settable mixtures, in particular concrete, and correspondingly produced articles, both continuous reinforcing strands and fibers being introduced into the material.
  • this document does not disclose the manufacture of prestressed concrete and the corresponding use and arrangement of tensioned strands during extrusion, but describes other shapes, e.g. a spiral insertion of strands into the concrete.
  • Natural fibers are given as preferred fibers, but metal fibers are also mentioned as discontinuous fibers to be incorporated.
  • the specific examples dealing with the use of fiber concrete do not provide any more detailed specifications of the fibers introduced and describe the use of a piston extruder for introducing the mixture into a mold.
  • the present invention seeks to improve the known prestressed concrete slab and the process for their production to the effect that the efficiency in the use of such plates under construction is further increased and the sustainability of the plates, especially in the transverse direction clearly is improved, so that it can be produced in larger widths.
  • the object underlying the invention is achieved in that a fiber concrete is used as the concrete material, fibers being used as fibers with a volume fraction of at least 0.1%, which have a cross section between 0.1 and 1 mm 2 and an average length between 20 and 100 mm.
  • the prestressed concrete hollow plate according to the invention is characterized in that the concrete material of this plate consists of fiber concrete, wherein the fibers are steel fibers with a cross section between 0.1 and 1 mm 2 and a length between 20 and 100 mm and at least 0.1% of the volume of Make out concrete.
  • Steel fibers are preferably used in an amount of about 60 kg / m 3 of concrete, which corresponds, for example, to a volume fraction of about 0.8%.
  • the fibers have a cross section between 0.1 and 1 mm and an average length between 20 and 100 mm, preferably between at least 30 or 50 and 70 mm.
  • steel fibers with a round cross-section and a diameter of about 0.5 mm and a mean length of 60 mm can be used.
  • the steel fibers have a considerable influence on the flowability of the concrete, which is much more difficult to process and extrude due to the fiber content, it has been shown that the individual parameters and the constituents of the concrete are quite so adjustable that the one corresponding amount of fibers still containing concrete to the desired plate cross section is extrudable.
  • the required green state stability that is to say the dimensional stability of the concrete immediately after the extrusion, is retained to a sufficient extent.
  • the minimum wall thicknesses of upper and lower flange are increased slightly to values above 40 mm, in particular to at least 45 or approximately 50 mm.
  • the concrete is significantly easier to extrude, although it has a significantly higher toughness and poorer flowability than conventional concrete, which is normally used to extrude hollow slabs. has.
  • the prestressed concrete hollow slabs produced in this way have a significantly better load capacity with bending moments in the transverse direction and, moreover, can also be loaded dynamically.
  • the prestressed concrete hollow slabs according to the invention have already been produced in widths of up to 3 m, although, in principle, production in larger widths would also be possible, which, however, does not make sense in practice for reasons of poor transportability of such wide plates.
  • the advantageous properties of the panel according to the invention not only considerably extend the field of use of such prestressed concrete hollow panels, e.g. On ceilings in industrial buildings, which can even be used by forklifts, but also the installation of appropriate plates is considerably more economical, since the number of required for a ceiling plates when using 3 m wide plates compared to the conventional, a maximum of 1.2 m wide panels is reduced by a factor of 2.5 and thus also reduces the number of joints between the plates, which considerably accelerates the completion of corresponding ceilings and floors.
  • the plates need not be manufactured exclusively in widths of 3 m, but should preferably have a width of at least 1.2 m or more, the differences in the width dimensions between different plates preferably being 60 cm each.
  • plates in widths of 1.2 m which can of course also be produced as required by the method according to the invention and as prestressed concrete slabs with fiber concrete, so plates in widths of 1.8 m, 2.4 m and preferably 3 m should be prepared ,
  • plates of greater width could be produced, as far as they can be easily transported to their place of use.
  • the ridges remaining between two adjacent cavities should have a width of well over 40 mm, typically about 60 mm, as a minimum, and the ridges on the side plate edges may be slightly wider, e.g. be at least 70 mm or 80 mm wide.
  • the height of the cavities depends on the thickness of the plates, wherein the height of the cavities is dimensioned in the preferred embodiment so that the minimum thickness of the upper and lower belt above and below the respective cavities is 50 mm.
  • the basic shape of the cavities is either circular, elliptical or rectangular, but in the latter case with clearly rounded corners.
  • the cross-sectional shape of the cavities should be designed so that the minimum radius of curvature in cross section is 50 mm, preferably 60 to 100 mm.
  • the typical plate thicknesses are 265, 320 and 400 mm.
  • the cavities should each have approximately the same width even with different thicknesses, but of course have different heights at different plate thicknesses, so that there is the mentioned minimum flange thickness of the upper and lower chords.
  • the minimum web width of the webs connecting the upper and lower chords can remain the same for the different board thicknesses, since the width of the cavities and their positioning remain the same. This facilitates in particular the production by changing only the spacings of the upper and lower edges of the extrusion dies at different plate thicknesses on the extrusion dies and the tubes forming the cavities need to be replaced, but their position remains unchanged.
  • cavities are prepared by cutting with a high-pressure jet of dry ice. This method allows the walls of corresponding cavities to be made with sufficiently smooth surfaces. At the same time, however, in cavities extending over prestressed strands, these strands remain undamaged. Thus, after the cavities have been produced in the not yet hardened concrete by cutting with a dry ice jet, one can wait for the setting of the concrete and, if necessary, separate the strands which may be passing through the produced cavities.
  • the cutting by means of a dry ice jet can of course be applied to other types of concrete than fiber concrete and can be applied in particular to concrete and fiber concrete, which is not used for the production of prestressed concrete hollow slabs apply.
  • the cutting with dry ice has the advantage that the dry ice itself, namely CO 2 in solid form, leaves no residue and does not have to be eliminated, the process is also environmentally friendly, as the CO 2 used is previously deprived of air.
  • Figure 1 is a perspective view of a prestressed concrete hollow plate, which is generally designated 1 and which is traversed by parallel, tubular cavities, wherein in the example shown a total of ten cavities are provided and the plate has a width of about 3 m, from which a pitch between the cavities of slightly less than 30 cm, eg about 28 cm, results. Further details will be described in connection with the cross sections of three different prestressed concrete hollow slabs shown in FIG.
  • Each of the slabs consists of a top chord 4, ie the concrete layer which extends continuously above the cavities, a lower flange 5, namely the concrete layer extending below the cavities and the webs 6 which interconnect the upper flange 4 and the lower flange 5 between the individual cavities
  • the same width, but different heights, they have the basic shape of a rectangle with strongly rounded corners, with the radius of curvature of the corner areas of the order of 80 mm.
  • the webs 6 between the cavities 3 have a width of about 60 mm and the minimum thickness of the top and bottom chord is 45 mm, in some embodiments 50 or 55 mm, depending on the desired load capacity and other parameters.
  • the minimum thickness of the upper and lower chords and the same minimum width of the webs between the cavities results for the plate with the largest diameter and the largest ratio of the cross-sectional area of the cavities to the cross-sectional area of the concrete or the total cross-section of the plate, while this ratio at the thinnest plate becomes minimal.
  • Die.vorgespannten strands 2 are each in the gussets, that is arranged at the transition of the individual webs 6 to the upper flange 4 and lower flange 5. In the lower gusset, e.g.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Panels For Use In Building Construction (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Table Devices Or Equipment (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Claims (17)

  1. Procédé de fabrication de panneaux creux en béton précontraint (1), dans lequel plusieurs torons (2) sont tendus en parallèle, individuellement ou en groupes, entre deux supports distants l'un de l'autre et sont enveloppés de béton dans une opération d'extrusion, des espaces (3) qui s'étendent parallèlement aux torons étant ménagés entre les torons enveloppés de béton, caractérisé en ce que le béton utilisé est un béton à adjuvent fibreux, les fibres utilisés étant des fibres d'acier dans un pourcentage en volume d'au moins 0,1% qui ont une section comprise entre 0,1 et 1 mm2 et une longueur moyenne comprise entre 20 et 100 mm.
  2. Procédé selon la revendication 1, caractérisé en ce que le béton à adjuvant fibreux est fabriqué avec un pourcentage en volume d'au moins 1 à 3 dm3 de fibres par mètre cube de béton, avantageusement au moins 5 à 10 dm3 de fibres par mètre cube de béton.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il est ajouté au béton des fibres dans une quantité d'au moins 30 kg/m3, avantageusement entre 40 et 80 kg/m3, de béton à adjuvant fibreux.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que les fibres ont une longueur moyenne comprise entre 30 et 70 mm.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que les panneaux sont fabriqués dans une largeur d'au moins 1,2 m ou plus, avantageusement dans des largeurs de 1,8 m, 2,4 m et 3 m.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que les panneaux sont fabriqués en ménageant, indépendamment de l'épaisseur des panneaux, des espaces présentant entre eux une distance modulaire moyenne comprise entre 20 et 40 cm, avantageusement entre 25 et 35 cm et en particulier entre 28 et 30 cm.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que les espaces ménagés dans les panneaux ont une section sensiblement rectangulaire et des coins arrondis.
  8. Procédé selon la revendication 7, caractérisé en ce que le rayon de courbure des coins est d'au moins 50 mm, avantageusement est compris entre 60 et 100 mm.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la membrure supérieure et la membrure inférieure des panneaux creux, tout comme les nervures s'étendant entre la membrure supérieure et la membrure inférieure et séparant les espaces les uns des autres, sont extrudées avec une épaisseur de paroi de plus de 40 mm, avantageusement de plus de 45 mm et en particulier de 50 mm environ.
  10. Panneau creux en béton précontraint (1), constitué d'une membrure supérieure (4), d'une membrure inférieure (5) et de nervures (6), s'étendant entre la membrure inférieure et la membrure supérieure, qui limitent des espaces (3) s'étendant en parallèle, des torons précontraints (2) étant disposés parallèlement aux espaces dans le béton et les panneaux étant fabriqués par extrusion de béton le long des torons précontraints (2), caractérisé en ce que le béton contient un pourcentage en volume d'au moins 0,1 % de fibres d'acier qui ont une section comprise entre 0,1 et 1 mm2 et une longueur moyenne comprise entre 20 et 100 mm.
  11. Panneau creux en béton précontraint selon la revendication 10, caractérisé en ce que les fibres sont des fibres d'acier qui sont contenues dans le béton à adjuvant fibreux dans une quantité d'au moins 30 kg/m3, avantageusement dans une quantité comprise entre 40 kg/m3 et 80 kg/m3.
  12. Panneau creux en béton précontraint selon la revendication 10 ou 11, caractérisé en ce que les membrures supérieures, les membrures inférieures et les nervures s'étendant entre lesdites membrures ont des épaisseurs de paroi au moins supérieures à 40 mm, avantageusement supérieures à 45 mm et notamment égales à 50 mm environ.
  13. Panneau creux en béton précontraint selon l'une des revendications 10 à 12, caractérisé en ce que les espaces (3) ont une section ronde respectivement elliptique ou rectangulaire avec des régions arrondies dans les coins.
  14. Panneau creux en béton précontraint selon la revendication 13, caractérisé en ce que le rayon de courbure minimum des sections d'espace est d'au moins 50 mm, avantageusement est compris entre 60 et 100 mm.
  15. Panneau creux en béton précontraint selon l'une des revendications 10 à 14, caractérisé en ce que le panneau a une largeur d'au moins 1,2 m ou plus, avantageusement une largeur comprise entre 1,8 et 3 m, notamment une largeur de 1,8 m, de 2,4 m ou de 3 m.
  16. Panneau creux en béton précontraint selon l'une des revendications 10 à 15, caractérisé en ce que la distance modulaire entre les espaces (3) est indépendante de la largeur et de l'épaisseur des panneaux et est comprise entre 26 et 30 cm environ, notamment est égale à 28 cm environ.
  17. Panneau creux en béton précontraint selon l'une des revendications 10 à 16, caractérisé en ce que la section des panneaux a une forme essentiellement trapézoïdale, la membrure supérieure (4) ayant une largeur inférieure d'environ 5 cm à celle de la membrure inférieure (5).
EP01964841A 2000-08-03 2001-07-14 Dalle creuse en beton precontraint et son procede de fabrication Expired - Lifetime EP1307326B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10037766 2000-08-03
DE10037766A DE10037766A1 (de) 2000-08-03 2000-08-03 Spannbetonhohlplatte und Verfahren zur Herstellung derselben
PCT/DE2001/002720 WO2002012649A2 (fr) 2000-08-03 2001-07-14 Dalle creuse en beton precontraint et son procede de fabrication

Publications (2)

Publication Number Publication Date
EP1307326A2 EP1307326A2 (fr) 2003-05-07
EP1307326B1 true EP1307326B1 (fr) 2006-03-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01964841A Expired - Lifetime EP1307326B1 (fr) 2000-08-03 2001-07-14 Dalle creuse en beton precontraint et son procede de fabrication

Country Status (5)

Country Link
EP (1) EP1307326B1 (fr)
AT (1) ATE321638T1 (fr)
AU (1) AU2001285681A1 (fr)
DE (3) DE10037766A1 (fr)
WO (1) WO2002012649A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2955294A1 (fr) 2014-06-13 2015-12-16 Elbe Spannbetonwerk GmbH & Co. KG Plaque de serrage creuse en béton

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011034420A1 (fr) * 2009-09-15 2011-03-24 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Dalle à cœur creux avec résistance au feu améliorée
CN102267183B (zh) * 2011-08-25 2013-10-02 张自明 一种能够调整厚度的预应力混凝土板推挤成型机

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146508A (en) * 1959-11-03 1964-09-01 Henry A Berliner Apparatus for extruding reinforced members
US3143781A (en) * 1961-02-13 1964-08-11 Kalns Arvids Concrete slab forming machine
US3181222A (en) * 1962-09-27 1965-05-04 Percy W Palmer Machine for manufacture of prestressed concrete conduit
BE793744A (fr) * 1973-01-08 1973-07-09 Bekaert Sa Nv Gewapend bouwpaneel
US4067676A (en) * 1974-12-19 1978-01-10 Hewitt Frederick M Apparatus for extruding reinforced concrete
DE2504122C3 (de) * 1975-01-31 1978-09-07 Hochtief Ag Fuer Hoch- Und Tiefbauten Vormals Gebr. Helfmann, 4300 Essen Im Spannbett vorgespanntes Bauteil aus Stahlbeton
FI67320C (fi) * 1983-05-09 1985-03-11 Partek Ab Foerfarande och glidgjutanordning foer gjutning av betongstycken
GB8531919D0 (en) * 1985-12-31 1986-02-05 Alphair Ventilating Systems Auger construction for concrete slabs
US5545297A (en) * 1992-08-11 1996-08-13 E. Khashoggi Industries Methods for continuously placing filaments within hydraulically settable compositions being extruded into articles of manufacture
CH688033A5 (de) * 1993-12-08 1997-04-30 Stahlton Ag Verfahren fuer die Herstellung von Bauteilen aus faserverstaerkten mineralisch gebundenen Baustoffen.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2955294A1 (fr) 2014-06-13 2015-12-16 Elbe Spannbetonwerk GmbH & Co. KG Plaque de serrage creuse en béton

Also Published As

Publication number Publication date
DE10037766A1 (de) 2002-02-14
WO2002012649A8 (fr) 2002-06-06
AU2001285681A1 (en) 2002-02-18
WO2002012649A2 (fr) 2002-02-14
ATE321638T1 (de) 2006-04-15
WO2002012649A3 (fr) 2002-04-18
EP1307326A2 (fr) 2003-05-07
DE50109390D1 (de) 2006-05-18
DE10193177D2 (de) 2003-07-03

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