EP1918474A1 - Method for pouring a structural floor, a structural floor and a hollowcore concrete slab and a strip-shaped element for such a structural floor - Google Patents

Method for pouring a structural floor, a structural floor and a hollowcore concrete slab and a strip-shaped element for such a structural floor Download PDF

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Publication number
EP1918474A1
EP1918474A1 EP07119043A EP07119043A EP1918474A1 EP 1918474 A1 EP1918474 A1 EP 1918474A1 EP 07119043 A EP07119043 A EP 07119043A EP 07119043 A EP07119043 A EP 07119043A EP 1918474 A1 EP1918474 A1 EP 1918474A1
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EP
European Patent Office
Prior art keywords
strip
structural floor
hollowcore
concrete slabs
hollowcore concrete
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Withdrawn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
EP07119043A
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German (de)
French (fr)
Inventor
Anne Pieter Van Driesum
Hendrik Eelco Diepeveen
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Individual
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Individual
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Publication date
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Publication of EP1918474A1 publication Critical patent/EP1918474A1/en
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    • 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
    • E04B5/06—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement with beams placed against one another optionally with pointing-mortar
    • 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 invention relates to a method for pouring a structural floor, according to which hollowcore concrete slabs are placed at least substantially united onto beams, after which a space between the hollowcore concrete slabs is filled with a mortar.
  • the beams will be made of concrete or steel.
  • a beam never is completely rigid. For that reason the beam will always bend when loaded. The result of this bending is a pressure force, generated in the upper half of a hollowcore concrete slab. More in particular this pressure force is generated near beam. The force may become so big that near the beam the hollowcore concrete slab collapses. In practise, the beam is therefore constructed more rigid than strictly speaking would be necessary, which increases the costs.
  • the method according to the invention substantially obviates this disadvantage and is characterised in that before pouring the mortar at least near the beams, in the space between the hollowcore concrete slabs, a strip is inserted, made of a flexible material. In this way, a transfer of a pressure force from one hollowcore concrete slab to another hollowcore concrete slab is prevented, which in fact means that this pressure force will not come into being.
  • a further favourable realisation in which a minimum amount of strip may be used is characterised in that the strip is inserted only in an upper part of the space between the beams.
  • the computer model also shows that unacceptably high shearing forces may occur only for hollowcore concrete slabs which are situated on the beam near the columns.
  • a further favourable realisation is therefore characterised in that the strip is inserted only between hollowcore concrete slabs which are located near columns.
  • the invention also relates to a structural floor, comprising beams with hollowcore concrete slabs placed on it, as well as a filling material for filling a space between the hollowcore concrete slabs.
  • Structural floors of this type are known.
  • a problem with the known structural floors is that sometimes hollowcore concrete slabs become defective near the beams.
  • the structural floor according to the invention substantially obviates this disadvantage and is characterised in that the structural floor moreover comprises strip-shaped elements, made of a flexible material, inserted in the space between the hollowcore concrete slabs, near the beams.
  • a favourable embodiment of the inventive structural floor is characterised in that a strip-shaped element is made of a synthetic material or a rubber compound which may be embedded into the filling material.
  • the strip-shaped element is provided with means for attachment, made so that it may be suspended centrally in a space between two hollowcore concrete slabs, before the filling material is poured.
  • a favourable alternative embodiment is characterised in that at least near an extremity a hollowcore concrete slab is provided with a recess in which a strip-shaped element may be inserted.
  • the strip-shaped element forms in fact part of the hollowcore concrete slab.
  • the invention also relates to a hollowcore concrete slab, provided with a recess on at least one extremity in which a strip-shaped element may be inserted with a length of at least 200 millimetres, to be used as part of a structural floor as described in one of the previous paragraphs.
  • the invention also relates to a strip-shaped element made of a synthetic material or a rubber compound with a length of at least 300 millimetres, to be used as part of a structural floor as described in one of the previous paragraphs.
  • Fig. 1 schematically represents a possible embodiment of a structural floor in front view, consisting of beams 1, supported by columns 2, onto which beams 1 hollowcore concrete slabs 3 are placed, after which a concrete mixture is poured into the space between the hollowcore concrete slabs.
  • a solid beam is used, but of course one may also use integrated beams which are completely integrated in the floor.
  • Beam 1 is not rigid and will for that reason slightly bend. As a result of this bending, a pressure force is generated in an upper half of the hollowcore concrete slab. In the centre of the span length of support, the pressure force will be the largest and above columns 2 it will be practically zero. The change of the strength of the pressure force is the largest above columns 2 and in the centre of the span length of support it will be practically zero. The change of the pressure force is generated by shearing forces. These shearing forces, which act in a longitudinal direction of beam 1, must be passed through via the thin bridges between the channels 4 of the hollowcore concrete slabs.
  • the additional shearing forces which act in a direction perpendicular to the usual shearing force, may cause the bridges to collapse, which in fact means that a hollowcore concrete slab collapses.
  • the pressure force in the upper half of the hollowcore concrete slabs is passed via the spaces between the hollowcore concrete slabs, the so-called U-butt joints, which are filled with a concrete mixture. Therefore, according to the invention, prior to the pouring a strip, made of a flexible material is placed inside the U-butt joints, which effectively prevents the building-up of a pressure force.
  • Fig. 2 schematically represents this structural floor in top view, with beams 1, supported by columns 2, onto which beams 1 hollowcore concrete slabs 3 are placed.
  • strips 5 are placed in a number of selected spaces between hollowcore concrete slabs 3, which are made of a flexible, compressible synthetic material or rubber. In this way a local build-up of too large pressure forces is prevented.
  • the selected places are situated on both sides of beams 2, on both sides of columns 2, as without this measure the largest shearing forces would build-up on these locations.
  • Strips 5 have a length of about 500 millimetres and they are placed in for example 30% of the joints between the hollowcore concrete slabs.
  • Fig. 3A schematically represents in cross section two hollowcore concrete slabs 3 and a strip 5 placed in between.
  • strip 5 is suspended inside the U-butt joint between hollowcore concrete slabs 3 with the aid of a bracket 6 and forms an integral part of the structural floor after pouring.
  • the width of strip 5 may be much smaller than the thickness of hollowcore concrete slabs 3.
  • the width of a strip 5 amounts to for example 20-30% of the thickness of a hollowcore concrete slab 3.
  • Fig. 3B schematically represents in cross section two hollowcore concrete slabs 3, which are each provided with strips 5a,5b that form integral parts of the corresponding hollowcore concrete slab 3.
  • the width of strips 5a,5b may be much smaller than the thickness of hollowcore concrete slabs 3.
  • the width of strips 5a,5b amounts to for example 20-30% of the thickness of a hollowcore concrete slab 3. It is also possible to manufacture hollowcore concrete slabs 3 provided with only one strip. The disadvantage is that while the hollowcore concrete slabs 3 are placed, one has to pay attention to the orientation of the hollowcore concrete slabs.
  • Fig. 4A perspectively represents a strip 5 provided with fixation means 6.
  • Fixation means 6 are for example manufactured of metal plate or plastic and the dimensions are such that on a bottom side strip 5 is clamped, while on the top the wings 7a,7b have such a length that they may rest on two neighbouring hollowcore concrete slabs.
  • Fig. 4B perspectively represents a strip provided with two carrying brackets 8a,8b.
  • Carrying brackets 8a,8b are manufactured for example of steel wire and the dimensions are such that on a bottom side strip 5 is clamped, while on the top the ends have such a length that they may rest on two neighbouring hollowcore concrete slabs.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Floor Finish (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

The invention relates to a method for pouring a structural floor, in the process of which hollowcore concrete slabs (3) are placed at least substantially united onto beams (1), after which the space between the hollowcore concrete slabs (3) is filled with a mortar. Before pouring, strips (5) made of a flexible material are placed in a number of selected spaces between the hollowcore concrete slabs (3).

Description

  • The invention relates to a method for pouring a structural floor, according to which hollowcore concrete slabs are placed at least substantially united onto beams, after which a space between the hollowcore concrete slabs is filled with a mortar. Usually, the beams will be made of concrete or steel.
  • A beam never is completely rigid. For that reason the beam will always bend when loaded. The result of this bending is a pressure force, generated in the upper half of a hollowcore concrete slab. More in particular this pressure force is generated near beam. The force may become so big that near the beam the hollowcore concrete slab collapses. In practise, the beam is therefore constructed more rigid than strictly speaking would be necessary, which increases the costs.
  • The method according to the invention substantially obviates this disadvantage and is characterised in that before pouring the mortar at least near the beams, in the space between the hollowcore concrete slabs, a strip is inserted, made of a flexible material. In this way, a transfer of a pressure force from one hollowcore concrete slab to another hollowcore concrete slab is prevented, which in fact means that this pressure force will not come into being.
  • The pressure forces generated in a hollowcore concrete slab and the additional shearing forces caused by it can be calculated with the aid of a computer model. It becomes clear then that there is a so called supporting length of the hollowcore concrete slab which amounts to about 500 millimetres. A favourable realisation of the inventive method is therefore characterised in that the strip is inserted over a length of 200-700 millimetres.
  • A further favourable realisation in which a minimum amount of strip may be used is characterised in that the strip is inserted only in an upper part of the space between the beams.
  • The computer model also shows that unacceptably high shearing forces may occur only for hollowcore concrete slabs which are situated on the beam near the columns. A further favourable realisation is therefore characterised in that the strip is inserted only between hollowcore concrete slabs which are located near columns.
  • The invention also relates to a structural floor, comprising beams with hollowcore concrete slabs placed on it, as well as a filling material for filling a space between the hollowcore concrete slabs. Structural floors of this type are known. A problem with the known structural floors is that sometimes hollowcore concrete slabs become defective near the beams. The structural floor according to the invention substantially obviates this disadvantage and is characterised in that the structural floor moreover comprises strip-shaped elements, made of a flexible material, inserted in the space between the hollowcore concrete slabs, near the beams.
  • A favourable embodiment of the inventive structural floor is characterised in that a strip-shaped element is made of a synthetic material or a rubber compound which may be embedded into the filling material. Preferably, the strip-shaped element is provided with means for attachment, made so that it may be suspended centrally in a space between two hollowcore concrete slabs, before the filling material is poured.
  • A favourable alternative embodiment is characterised in that at least near an extremity a hollowcore concrete slab is provided with a recess in which a strip-shaped element may be inserted. In this embodiment, the strip-shaped element forms in fact part of the hollowcore concrete slab.
  • The invention also relates to a hollowcore concrete slab, provided with a recess on at least one extremity in which a strip-shaped element may be inserted with a length of at least 200 millimetres, to be used as part of a structural floor as described in one of the previous paragraphs.
  • The invention also relates to a strip-shaped element made of a synthetic material or a rubber compound with a length of at least 300 millimetres, to be used as part of a structural floor as described in one of the previous paragraphs.
  • The invention will now be further explained with a reference to the following figures, in which:
    • Fig. 1
    schematically represents a possible embodiment of a structural floor in front view;
    Fig. 2
    schematically represents this structural floor in top view;
    Fig. 3A
    schematically represents in cross section two hollowcore concrete slabs and a strip placed in between;
    Fig. 3B
    schematically represents in cross section two hollowcore concrete slabs provided with strips;
    Fig. 4A
    perspectively represents a strip provided with fixation means;
    Fig. 4B
    perspectively represents a strip provided with two carrying brackets.
  • Fig. 1 schematically represents a possible embodiment of a structural floor in front view, consisting of beams 1, supported by columns 2, onto which beams 1 hollowcore concrete slabs 3 are placed, after which a concrete mixture is poured into the space between the hollowcore concrete slabs. In the embodiment shown here, a solid beam is used, but of course one may also use integrated beams which are completely integrated in the floor.
  • Beam 1 is not rigid and will for that reason slightly bend. As a result of this bending, a pressure force is generated in an upper half of the hollowcore concrete slab. In the centre of the span length of support, the pressure force will be the largest and above columns 2 it will be practically zero. The change of the strength of the pressure force is the largest above columns 2 and in the centre of the span length of support it will be practically zero. The change of the pressure force is generated by shearing forces. These shearing forces, which act in a longitudinal direction of beam 1, must be passed through via the thin bridges between the channels 4 of the hollowcore concrete slabs. The additional shearing forces, which act in a direction perpendicular to the usual shearing force, may cause the bridges to collapse, which in fact means that a hollowcore concrete slab collapses. The pressure force in the upper half of the hollowcore concrete slabs is passed via the spaces between the hollowcore concrete slabs, the so-called U-butt joints, which are filled with a concrete mixture. Therefore, according to the invention, prior to the pouring a strip, made of a flexible material is placed inside the U-butt joints, which effectively prevents the building-up of a pressure force.
  • Fig. 2 schematically represents this structural floor in top view, with beams 1, supported by columns 2, onto which beams 1 hollowcore concrete slabs 3 are placed. Before the structural floor is poured, strips 5 are placed in a number of selected spaces between hollowcore concrete slabs 3, which are made of a flexible, compressible synthetic material or rubber. In this way a local build-up of too large pressure forces is prevented. The selected places are situated on both sides of beams 2, on both sides of columns 2, as without this measure the largest shearing forces would build-up on these locations. Strips 5 have a length of about 500 millimetres and they are placed in for example 30% of the joints between the hollowcore concrete slabs.
  • Fig. 3A schematically represents in cross section two hollowcore concrete slabs 3 and a strip 5 placed in between. In this embodiment, strip 5 is suspended inside the U-butt joint between hollowcore concrete slabs 3 with the aid of a bracket 6 and forms an integral part of the structural floor after pouring. As pressure forces due to the bending of the supporting beam only develop in the upper part of hollowcore concrete slabs 3, the width of strip 5 may be much smaller than the thickness of hollowcore concrete slabs 3. The width of a strip 5 amounts to for example 20-30% of the thickness of a hollowcore concrete slab 3.
  • Fig. 3B schematically represents in cross section two hollowcore concrete slabs 3, which are each provided with strips 5a,5b that form integral parts of the corresponding hollowcore concrete slab 3. As pressure forces due to the bending of the supporting beam only develop in the upper part of hollowcore concrete slabs 3, the width of strips 5a,5b may be much smaller than the thickness of hollowcore concrete slabs 3. The width of strips 5a,5b amounts to for example 20-30% of the thickness of a hollowcore concrete slab 3. It is also possible to manufacture hollowcore concrete slabs 3 provided with only one strip. The disadvantage is that while the hollowcore concrete slabs 3 are placed, one has to pay attention to the orientation of the hollowcore concrete slabs.
  • Fig. 4A perspectively represents a strip 5 provided with fixation means 6. Fixation means 6 are for example manufactured of metal plate or plastic and the dimensions are such that on a bottom side strip 5 is clamped, while on the top the wings 7a,7b have such a length that they may rest on two neighbouring hollowcore concrete slabs.
  • Fig. 4B perspectively represents a strip provided with two carrying brackets 8a,8b. Carrying brackets 8a,8b are manufactured for example of steel wire and the dimensions are such that on a bottom side strip 5 is clamped, while on the top the ends have such a length that they may rest on two neighbouring hollowcore concrete slabs.

Claims (10)

  1. Method for pouring a structural floor, according to which hollowcore concrete slabs are placed at least substantially united onto beams, after which a space between the hollowcore concrete slabs is filled with a mortar, characterised in that before pouring the mortar at least near the beams, in the space between the hollowcore concrete slabs, a strip is inserted, made of a flexible material.
  2. Method according to claim 1, characterised in that the strip is inserted over a length of 200-700 millimetres.
  3. Method according to claim 1 or 2, characterised in that the strip is inserted only in an upper part of the space between the beams.
  4. Method according to claim 1,2 or 3, characterised in that the strip is inserted only between hollowcore concrete slabs which are located near columns.
  5. Structural floor, comprising beams with hollowcore concrete slabs placed on it, as well as a filling material for filling a space between the hollowcore concrete slabs, characterised in that the structural floor moreover comprises strip-shaped elements, made of a flexible material, inserted in the space between the hollowcore concrete slabs, near the beams.
  6. Structural floor according to claim 5, characterised in that a strip-shaped element is made of a synthetic material or a rubber compound.
  7. Structural floor according to claim 5, characterised in that a strip-shaped element is provided with means for attachment, made so that it may be suspended centrally in a space between two hollowcore concrete slabs.
  8. Structural floor according to claim 5, characterised in that at least near an extremity a hollowcore concrete slab is provided with a recess in which a strip-shaped element may be inserted.
  9. Hollowcore concrete slab, provided with a recess on at least one extremity in which a strip-shaped element may be inserted with a length of at least 200 millimetres, to be used as part of a structural floor according to one of the claims 5 to 8.
  10. Strip-shaped element made of a synthetic material or a rubber compound with a length of at least 300 millimetres, to be used as part of a structural floor according to one of the claims 5 to 8.
EP07119043A 2006-10-31 2007-10-23 Method for pouring a structural floor, a structural floor and a hollowcore concrete slab and a strip-shaped element for such a structural floor Withdrawn EP1918474A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1032778A NL1032778C1 (en) 2006-10-31 2006-10-31 Method for pouring a system floor, system floor, as well as a channel plate and a strip-shaped element for such a system floor.

Publications (1)

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EP1918474A1 true EP1918474A1 (en) 2008-05-07

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EP07119043A Withdrawn EP1918474A1 (en) 2006-10-31 2007-10-23 Method for pouring a structural floor, a structural floor and a hollowcore concrete slab and a strip-shaped element for such a structural floor

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB538101A (en) * 1940-01-19 1941-07-21 Alfred George Rowse Improvements in the construction of concrete floor or roofing structures
FR2383283A2 (en) * 1977-03-10 1978-10-06 Saret Lightweight composite floor panel - consists of section with girders of concrete, with cellular filling material and reinforcements
FR2540161A1 (en) * 1983-02-01 1984-08-03 Bouygues Sa Method and elements for constructing a reinforced concrete building floor
US20050204671A1 (en) * 2004-03-16 2005-09-22 The Cretex Companies, Inc. Concrete section joint apparatus and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB538101A (en) * 1940-01-19 1941-07-21 Alfred George Rowse Improvements in the construction of concrete floor or roofing structures
FR2383283A2 (en) * 1977-03-10 1978-10-06 Saret Lightweight composite floor panel - consists of section with girders of concrete, with cellular filling material and reinforcements
FR2540161A1 (en) * 1983-02-01 1984-08-03 Bouygues Sa Method and elements for constructing a reinforced concrete building floor
US20050204671A1 (en) * 2004-03-16 2005-09-22 The Cretex Companies, Inc. Concrete section joint apparatus and method

Also Published As

Publication number Publication date
NL1032778C1 (en) 2008-05-06

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