EP1307326A2 - Spannbetonhohlplatte und verfahren zur herstellung derselben - Google Patents
Spannbetonhohlplatte und verfahren zur herstellung derselbenInfo
- Publication number
- EP1307326A2 EP1307326A2 EP01964841A EP01964841A EP1307326A2 EP 1307326 A2 EP1307326 A2 EP 1307326A2 EP 01964841 A EP01964841 A EP 01964841A EP 01964841 A EP01964841 A EP 01964841A EP 1307326 A2 EP1307326 A2 EP 1307326A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- concrete
- cavities
- prestressed
- 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.)
- Granted
Links
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 hollow slab, in which a plurality of strands are clamped between supports, which are arranged at a distance from one another, individually or in groups parallel to one another and are encased in concrete in the extrusion process, cavities extending parallel to the strands between the concrete-covered strands remain.
- the hollow concrete slabs produced with such a method consist of an upper chord, a lower chord and webs extending between the lower chord and the upper chord, each of which delimit parallel cavities, prestressed strands being arranged in the concrete material parallel to the cavities, the strands at the Extrude the concrete to be embedded in this.
- the concrete must have a very high viscosity and a very pronounced green stability, i.e. it must have sufficient dimensional stability when it is pressed out of the extrusion openings so that the slab cross-section, including the flat upper and lower surfaces, and the cavity cross-sections are preserved remain and the plate does not deform, or at most subsequently deformed in a precisely controllable manner.
- the concrete has to harden completely before the strands can be separated at the two ends of the 100 to 120 m long cavity slab produced in this way. After the concrete has hardened, the strands remain in the prestressed state due to their firm connection to the concrete material.
- the long extruded sheets are usually cut to sections of a length desired for a specific construction project, usually in the order of a few meters and up to 15 m, and the sheets are placed next to one another to form a ceiling or floor. walls, foundations or beams. Since the slabs have a slightly trapezoidal cross-section in such a way that the upper chord is between 2 and 5 cm narrower than the lower chord, only the lower chords abut against each other along the longitudinal edges of adjacent slabs when the slabs are laid, and the joint formed between them is made of concrete and mortar or another binding agent or a grout.
- these plates have the disadvantage of only a low load-bearing capacity with loads in the transverse direction and, in particular, they cannot be loaded dynamically, so they are not suitable for driving on vehicles with forklifts or for setting up machines that generate vibrations. Due to the low transverse load-bearing capacity, the panels can only be manufactured in maximum widths of around 1.2 m. This affects the economic efficiency inherent in the use of such panels in the production of corresponding buildings, since accordingly more joints have to be filled between the panels laid next to one another, which is relatively labor-intensive.
- the object of the present invention is to improve the known hollow prestressed concrete slab and the method for its production in such a way that the economy when using such slabs in construction is further increased and the load-bearing capacity of the slabs, particularly in the transverse direction. is significantly improved so that it can be produced in larger widths.
- the object on which the invention is based is achieved in that a fiber concrete is used as the concrete material.
- the prestressed concrete hollow slab according to the invention is characterized in that the concrete material of this slab consists of fiber reinforced concrete, preferably at least 0.1% of the volume of the concrete consisting of fibers.
- Steel fibers are preferably used in an amount of approximately 60 kg / m 3 of concrete, which corresponds, for example, to a volume fraction of approximately 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 a minimum of 30 or 50 and 70 mm.
- steel fibers with a round cross-section and a diameter of approximately 0.5 mm and an average 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, but it has been shown that the individual parameters and the components of the concrete can be adjusted so that even one appropriate amount of fiber-containing concrete still to the desired sheet cross section is extrudable.
- the required green stability i.e. the dimensional stability of the concrete immediately after extrusion, is also sufficiently maintained.
- the minimum wall thicknesses of the top flange and bottom flange are increased slightly to values above 40 mm, in particular to at least 45 or approx. 50 mm.
- the concrete can be extruded much more easily, although compared to conventional concrete, as is normally used for extruding hollow panels, it has a significantly higher toughness and poorer flowability due to the fiber content.
- the hollow prestressed concrete slabs produced in this way have a significantly better load capacity with bending moments in the transverse direction and are also dynamically loadable.
- the prestressed hollow concrete 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, but this is not practical in practice solely because of the poor transportability of such wide slabs.
- the advantageous properties of the slab according to the invention not only considerably expand the area of use of such prestressed hollow concrete slabs, e.g. on ceilings in industrial buildings that can even be driven by forklift trucks, but also the installation of appropriate panels becomes considerably more economical, since the number of panels required for a ceiling when using 3 m wide panels compared to the conventional, a maximum of 1.2 m wide slabs is reduced by a factor of 2.5 and thus the number of joints between the slabs is reduced accordingly, which considerably speeds up the completion of appropriate ceilings and floors.
- steel fibers can be used as fibers, but optionally also natural fibers or other metal fibers, which can vary considerably in cross-section and length compared to the preferred steel fibers.
- the plates do not have to be produced 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 in each case.
- panels in widths of 1.2 m which of course can also be produced using the method according to the invention and as hollow prestressed concrete panels with fiber concrete
- panels in widths of 1.8 m, 2.4 m and preferably 3 m should also be produced
- the method according to the invention could also be used to produce panels of greater width insofar as these can be transported to their place of use without any problems. While panels with a width of 1.2 m preferably have only four cavities, panels with a width of 1.8 m should have six cavities, panels with 2.4 m eight cavities and panels with a width of 3 m should have ten cavities. This results in a typical grid size between the cavities in the order of 30 cm or slightly below.
- the webs remaining between two adjacent cavities should have a width of significantly more than 40 mm, typically about 60 mm as the minimum dimension, and the webs on the side plate edges can be somewhat wider, for example at least 70 mm or 80 mm wide.
- the height of the cavities depends on the thickness of the plates, the height of the cavities being dimensioned in the preferred embodiment such that the minimum thickness of the upper chord and the lower chord is 50 mm above and below the respective cavities.
- the basic shape of the cavities is either circular, elliptical or rectangular, in the latter case, however, with clearly rounded corner areas.
- the cross-sectional shape of the cavities should preferably be designed such that the minimum radius of curvature in cross-section is 50 mm, preferably 60 to 100 mm.
- the typical panel 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 with different panel thicknesses, so that the minimum flange thickness of the upper and lower chords mentioned results.
- the minimum web width of the webs connecting the upper and lower chords can always remain the same with the different panel thicknesses, since the width of the cavities and their positioning also remain the same. This makes production easier, in particular, because with different plate thicknesses on the extrusion tools, only the distances between the upper and lower edges of the extrusion nozzles are changed and the tubes forming the cavities need to be replaced, but the position remains unchanged.
- Recesses often have to be made in appropriate plates. While this is relatively simple in the case of conventional hollow prestressed concrete slabs in the concrete material which has not yet set, in the present case the applicant has developed a method with which cavities are produced according to the invention by cutting with a high-pressure jet of dry ice. This method enables the walls of corresponding cavities to be produced with sufficiently smooth surfaces. At the same time, however, these strands remain undamaged in the case of cavities which extend over prestressed strands. After the voids have been produced in the concrete that has not yet set by cutting with a dry ice jet, the concrete can be waited for and, if necessary, the strands that may have passed through the voids now separated.
- Cutting by means of a dry ice jet can of course also be used on types of concrete other than fiber concrete and can also be used in particular on concrete and fiber concrete which is not used for the production of hollow prestressed concrete slabs.
- Cutting with dry ice has the advantage that the dry ice material itself, namely C0 2 in solid form, does not leave any residues and does not have to be removed, the method also being environmentally compatible insofar as the C0 2 used is previously removed from the air.
- Figure 1 is a perspective view of a portion of a manufactured according to the invention
- Prestressed concrete slab and Figure 2 shows the cross section of three slabs with a width of 3 m, but with different heights between approx. 265 and approx. 400 mm.
- FIG. 1 a perspective view of a prestressed concrete hollow slab, which is denoted overall by 1 and which is traversed by parallel, tubular cavities, in the example shown a total of ten cavities being provided and the slab having a width of approximately 3 m, from which it can be seen a grid dimension between the cavities of a little less than 30 cm, e.g. about 28 cm. Further details are described in connection with the cross sections of three different prestressed concrete hollow slabs shown in FIG.
- Each of the slabs consists of an upper chord 4, that is to say the concrete layer, which extends continuously above the cavities, a lower flange 5, namely the concrete layer each extending below the cavities and the webs 6, which connect the upper flange 4 and the lower flange 5 between the individual cavities.
- the cavities 3 have the different plates consistently the same width, but different height.They have the basic shape of a rectangle with strongly rounded corner areas, the radius of curvature of the corner areas being of the order of 80 mm.
- the webs 6 between the cavities 3 have a width of approximately 60 mm and the minimum thickness of the upper flange and lower flange is 45 mm, in some embodiments 50 or 55 mm, depending on the desired load capacity and other parameters.
- the largest ratio of the cross-sectional area of the cavities to the cross-sectional area of the concrete or to the total cross-section of the plate also results for the slab with the largest diameter, while this ratio becomes minimal with the thinnest plate.
- the prestressed strands 2 are each arranged in the gussets, that is to say at the transition from the individual webs 6 to the upper chord 4 or lower chord 5.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Panels For Use In Building Construction (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Table Devices Or Equipment (AREA)
- Producing Shaped Articles From Materials (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Description
Claims
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 (de) | 2000-08-03 | 2001-07-14 | Spannbetonhohlplatte und verfahren zur herstellung derselben |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1307326A2 true EP1307326A2 (de) | 2003-05-07 |
EP1307326B1 EP1307326B1 (de) | 2006-03-29 |
Family
ID=7651140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01964841A Expired - Lifetime EP1307326B1 (de) | 2000-08-03 | 2001-07-14 | Spannbetonhohlplatte und verfahren zur herstellung derselben |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1307326B1 (de) |
AT (1) | ATE321638T1 (de) |
AU (1) | AU2001285681A1 (de) |
DE (3) | DE10037766A1 (de) |
WO (1) | WO2002012649A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011034420A1 (en) * | 2009-09-15 | 2011-03-24 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Hollow core slab with improved fire resistance |
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 |
EP2955294A1 (de) | 2014-06-13 | 2015-12-16 | Elbe Spannbetonwerk GmbH & Co. KG | Spannbetonhohlplatte |
Family Cites Families (10)
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. |
-
2000
- 2000-08-03 DE DE10037766A patent/DE10037766A1/de not_active Withdrawn
-
2001
- 2001-07-14 EP EP01964841A patent/EP1307326B1/de not_active Expired - Lifetime
- 2001-07-14 AT AT01964841T patent/ATE321638T1/de not_active IP Right Cessation
- 2001-07-14 DE DE10193177T patent/DE10193177D2/de not_active Expired - Lifetime
- 2001-07-14 AU AU2001285681A patent/AU2001285681A1/en not_active Abandoned
- 2001-07-14 WO PCT/DE2001/002720 patent/WO2002012649A2/de active IP Right Grant
- 2001-07-14 DE DE50109390T patent/DE50109390D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0212649A3 * |
Also Published As
Publication number | Publication date |
---|---|
DE50109390D1 (de) | 2006-05-18 |
WO2002012649A2 (de) | 2002-02-14 |
DE10037766A1 (de) | 2002-02-14 |
ATE321638T1 (de) | 2006-04-15 |
WO2002012649A3 (de) | 2002-04-18 |
AU2001285681A1 (en) | 2002-02-18 |
WO2002012649A8 (de) | 2002-06-06 |
EP1307326B1 (de) | 2006-03-29 |
DE10193177D2 (de) | 2003-07-03 |
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