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WO1996002711A1 - Deck with composite action - Google Patents

Deck with composite action Download PDF

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Publication number
WO1996002711A1
WO1996002711A1 PCT/SE1995/000756 SE9500756W WO9602711A1 WO 1996002711 A1 WO1996002711 A1 WO 1996002711A1 SE 9500756 W SE9500756 W SE 9500756W WO 9602711 A1 WO9602711 A1 WO 9602711A1
Authority
WO
WIPO (PCT)
Prior art keywords
concrete
floor structure
composite floor
sheet
structure according
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.)
Ceased
Application number
PCT/SE1995/000756
Other languages
French (fr)
Inventor
Jan Strömberg
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.)
Plannja AB
Original Assignee
Plannja AB
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 Plannja AB filed Critical Plannja AB
Priority to AU29942/95A priority Critical patent/AU2994295A/en
Publication of WO1996002711A1 publication Critical patent/WO1996002711A1/en
Priority to DK199700035A priority patent/DK174207B1/en
Priority to NO970121A priority patent/NO308144B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
    • E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
    • E04B5/40—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element with metal form-slabs

Definitions

  • the present invention relates to a composite floor structure according to the preamble of Claim 1.
  • So-called composite floor structures are cast with the aid of a profiled plate as a working platform and permanent mould.
  • the profiled plate coacts with the concrete.
  • the profiled plate is not normally capable of supporting the load exerted by the wet concrete laid down in conjunction with concrete casting operations, making it necessary to support the structure from beneath.
  • the task of propping-up or likewise supporting a newly cast concrete floor structure is both expensive and time-consuming.
  • the building construction schedule as a whole is thus controlled essentially by the process of casting the concrete floor structures.
  • the object of the present invention is to provide a composite floor structure which in the concrete casting stage is able to withstand the same bearing stresses as the finished floor structure, so as to eliminate the need of supporting the structure from beneath.
  • This object is achieved with a composite floor structure that has the characteristic features set forth in the following Claims.
  • One advantage afforded by the invention is that it enables a building to be erected in a much more effective manner than was previously possible, due to the fact that it is no longer necessary to shore or prop-up the floor structure from beneath.
  • the invention enables the floor structures of a multi-storey building to be continued right up to the roof of the building, with all floor structures being cast sequentially in succession. The invention thus enables time to be saved and the work involved to be carried out in a more effective and efficient manner.
  • An inventive composite floor structure also requires less reinforcement and therewith provides gains by virtue of smaller material consumption.
  • Fig. 1 is a cross-sectional view of part of an inventive composite floor structure
  • Fig. 2 is a perspective view of the part of said floor structure shown in Fig. 1
  • Figs. 3 and 4 are cross-sectional views of parts of alternative embodiments of the inventive composite floor structure.
  • the invention first involves the construction of a floor structure from prefabricated sandwich elements which function as a mould and which are designed to coact with the concrete in a manner to obtain an ideal composite floor structure.
  • the sandwich elements are sufficiently strong and rigid to withstand short-term loads, the core material of said elements will contract or shrink with time, making the sandwich elements unsuitable for long-term floor structures.
  • Fig. 1 shows two juxtapositioned sandwich elements 1 which, although not shown, may be placed on a number of primary beams, and which are mutually connected along their long side-edges such as to form a casting platform.
  • the sandwich element 1 may be prefabricated and includes an upper sheet 2, made of sheet metal or steel plate, for instance, a core part 3 made of lightweight material, such as expanded polystyrene, polyurethane or mineral wool, and a bottom sheet 4 made of sheet metal or steel plate, for instance.
  • the sheets 2 and 4 are joined to the core 3 by gluing, heat-fusion or by adhesion.
  • An undercut 10 is provided along the longitudinal side edges of the core 3.
  • the longitudinal side edges of the bottom sheet 4 have an outwardly projecting part 11 which is terminated with an angled end-part 12 which includes concrete-engagement means in the form of holes 13, so as to obtain the best possible engagement of the element with the concret .
  • the top sheet 2 is provided along its longitudinally extending side edges with an outwardly projecting part 14 which is angled downwards slightly and which also includes concrete-engagement means in the form of holes 15, to obtain the best possible concrete engagement.
  • the sandwich elements 1 are placed on the primary beams and mutually joined together with the aid of a connecting strip 20 which is screwed firmly to the outwardly projecting parts 11 of juxtapositioned sandwich elements 1, as made apparent in Figs. 1 and 2.
  • a connecting strip 20 which is screwed firmly to the outwardly projecting parts 11 of juxtapositioned sandwich elements 1, as made apparent in Figs. 1 and 2.
  • the thus mutually connected sandwich elements 1 are then ready for the casting of concrete 90, optionally after laying-out further reinforcements (not shown) , this concrete filling-out the gaps between the cores 3 of juxtapositioned sandwich elements 1 to a level 91, indicated by a chain line in Fig. 1.
  • this concrete filling-out the gaps between the cores 3 of juxtapositioned sandwich elements 1 to a level 91, indicated by a chain line in Fig. 1.
  • Subsequent to casting the concrete 90 there is obtained a highly effective composite floor structure in which the concrete 90 engages with the outwardly projecting parts 11 of the bottom sheet 4 and in which the concrete 90 is also in engagement with the outwardly projecting parts 14 of the top sheet 2.
  • the bottom sheet takes-up tension forces of bending moments
  • the overlying concrete takes-up compression forces of bending moments
  • the concrete present between the sandwich elements transmits shear forces between the bottom sheet and the overlying concrete, optionally strengthened with shear reinforcements. Any tendency of the core 3 to settle is counteracted by virtue of the engagement of the concrete 90 with the undercuts 10 in the cores 3.
  • Fig. 3 illustrates an alternative embodiment in which the outwardly projecting parts 11' of the bottom sheets 4' are angled so as to enable mutually adjacent or contiguous sandwich elements 1' to be screwed together without using separate connecting strips.
  • the outwardly projecting parts 11' and 14' of this embodiment also include concrete engaging means in the form of holes 13' and 15' .
  • the concrete level 91 is shown by a chain line.
  • Fig. 4 shows an alternative embodiment in which the outwardly projecting parts 11" of the bottom sheets 4" are angled upwards so that the concrete engaging means/holes 13" will be located above the vertical level of the top sheet 2".
  • the outwardly projecting parts 14" of the top sheets 2" are all angled upwards such that the concrete engagement means/holes 15" will be located above the vertical level of the top sheet 2".
  • This embodiment enables tight abutment to be achieved between the longitudinally extending side-edges of respective sandwich elements 1" .
  • the concrete level 91 is shown by a chain line.
  • the Figure also shows reinforcement bars 80 extending through the holes 13". In the case of this embodiment, the outwardly folded bottom sheet takes-up the shear forces acting between the bottom sheet and the cast concrete.
  • top sheet, core and bottom sheet of the sandwich element may be comprised of materials other than those recited in the aforegoing, without departing from the scope of the invention.
  • the top sheet may also be given a profiled structure which enhances its ability to take-up pressure forces that prevail when concrete is being cast. If desired, the top sheet may be provided with embossments over the whole of its surface, with the intention of promoting the coaction between the components of the composite floor structure. If desired, the bottom sheet may also be given a profiled structure and provided with embossments, in addition to that exemplified in the Figures.
  • inventive composite floor structure may be further strengthened if necessary, by including reinforcement bars or some other appropriate reinforcement .

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Floor Finish (AREA)
  • Bridges Or Land Bridges (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

The present invention relates to a composite floor structure which includes a permanent mould and concrete (90) cast thereon, wherein the mould is comprised of a plurality of sandwich elements (1). Each sandwich element (1) includes a top sheet (2), a core (3) and a bottom sheet (4). The bottom sheet (4) has a part (11) which projects out from the core (3) along the longitudinal side-edges of the sheet and the outwardly projecting part (11) includes means (13) for engagement with the cast concrete (90).

Description

DECK WITH COMPOSITE ACTION
The present invention relates to a composite floor structure according to the preamble of Claim 1.
So-called composite floor structures are cast with the aid of a profiled plate as a working platform and permanent mould. When the casting compound/concrete has cured, the profiled plate coacts with the concrete. The profiled plate is not normally capable of supporting the load exerted by the wet concrete laid down in conjunction with concrete casting operations, making it necessary to support the structure from beneath. The task of propping-up or likewise supporting a newly cast concrete floor structure is both expensive and time-consuming. Furthermore, it is only possible to cast one floor, or deck, at a time, since it is necessary for an underlying floor to have obtained a certain degree of bearability or mechanical strength before it is able to withstand the forces that are exerted by an overlying floor and transmitted through the props or like supports used to support the same. The building construction schedule as a whole is thus controlled essentially by the process of casting the concrete floor structures.
The object of the present invention is to provide a composite floor structure which in the concrete casting stage is able to withstand the same bearing stresses as the finished floor structure, so as to eliminate the need of supporting the structure from beneath. This object is achieved with a composite floor structure that has the characteristic features set forth in the following Claims. One advantage afforded by the invention is that it enables a building to be erected in a much more effective manner than was previously possible, due to the fact that it is no longer necessary to shore or prop-up the floor structure from beneath. For instance, the invention enables the floor structures of a multi-storey building to be continued right up to the roof of the building, with all floor structures being cast sequentially in succession. The invention thus enables time to be saved and the work involved to be carried out in a more effective and efficient manner. An inventive composite floor structure also requires less reinforcement and therewith provides gains by virtue of smaller material consumption.
The invention will now be described with reference to an exemplifying embodiment thereof and also with reference to the accompanying drawings, in which Fig. 1 is a cross-sectional view of part of an inventive composite floor structure; Fig. 2 is a perspective view of the part of said floor structure shown in Fig. 1; and Figs. 3 and 4 are cross-sectional views of parts of alternative embodiments of the inventive composite floor structure.
The invention first involves the construction of a floor structure from prefabricated sandwich elements which function as a mould and which are designed to coact with the concrete in a manner to obtain an ideal composite floor structure. Although the sandwich elements are sufficiently strong and rigid to withstand short-term loads, the core material of said elements will contract or shrink with time, making the sandwich elements unsuitable for long-term floor structures. Fig. 1 shows two juxtapositioned sandwich elements 1 which, although not shown, may be placed on a number of primary beams, and which are mutually connected along their long side-edges such as to form a casting platform.
The sandwich element 1 may be prefabricated and includes an upper sheet 2, made of sheet metal or steel plate, for instance, a core part 3 made of lightweight material, such as expanded polystyrene, polyurethane or mineral wool, and a bottom sheet 4 made of sheet metal or steel plate, for instance. The sheets 2 and 4 are joined to the core 3 by gluing, heat-fusion or by adhesion.
An undercut 10 is provided along the longitudinal side edges of the core 3. The longitudinal side edges of the bottom sheet 4 have an outwardly projecting part 11 which is terminated with an angled end-part 12 which includes concrete-engagement means in the form of holes 13, so as to obtain the best possible engagement of the element with the concret . The top sheet 2 is provided along its longitudinally extending side edges with an outwardly projecting part 14 which is angled downwards slightly and which also includes concrete-engagement means in the form of holes 15, to obtain the best possible concrete engagement.
The sandwich elements 1 are placed on the primary beams and mutually joined together with the aid of a connecting strip 20 which is screwed firmly to the outwardly projecting parts 11 of juxtapositioned sandwich elements 1, as made apparent in Figs. 1 and 2. When the sandwich elements are joined together, either by means of the connecting strips or by being screwed directly to one another, there is formed a rigid plate-like structure which stabilizes the whole framework until the concrete subsequently cast has obtained sufficient mechanical strength.
The thus mutually connected sandwich elements 1 are then ready for the casting of concrete 90, optionally after laying-out further reinforcements (not shown) , this concrete filling-out the gaps between the cores 3 of juxtapositioned sandwich elements 1 to a level 91, indicated by a chain line in Fig. 1. Subsequent to casting the concrete 90, there is obtained a highly effective composite floor structure in which the concrete 90 engages with the outwardly projecting parts 11 of the bottom sheet 4 and in which the concrete 90 is also in engagement with the outwardly projecting parts 14 of the top sheet 2. The bottom sheet takes-up tension forces of bending moments, the overlying concrete takes-up compression forces of bending moments, and the concrete present between the sandwich elements transmits shear forces between the bottom sheet and the overlying concrete, optionally strengthened with shear reinforcements. Any tendency of the core 3 to settle is counteracted by virtue of the engagement of the concrete 90 with the undercuts 10 in the cores 3.
Fig. 3 illustrates an alternative embodiment in which the outwardly projecting parts 11' of the bottom sheets 4' are angled so as to enable mutually adjacent or contiguous sandwich elements 1' to be screwed together without using separate connecting strips. The outwardly projecting parts 11' and 14' of this embodiment also include concrete engaging means in the form of holes 13' and 15' . The concrete level 91 is shown by a chain line. Fig. 4 shows an alternative embodiment in which the outwardly projecting parts 11" of the bottom sheets 4" are angled upwards so that the concrete engaging means/holes 13" will be located above the vertical level of the top sheet 2". The outwardly projecting parts 14" of the top sheets 2" are all angled upwards such that the concrete engagement means/holes 15" will be located above the vertical level of the top sheet 2". This embodiment enables tight abutment to be achieved between the longitudinally extending side-edges of respective sandwich elements 1" . This enables mutually contiguous or adjacent sandwich elements 1" to be screwed together at the outwardly projecting parts 11" in a region of their mutual abutment. The concrete level 91 is shown by a chain line. The Figure also shows reinforcement bars 80 extending through the holes 13". In the case of this embodiment, the outwardly folded bottom sheet takes-up the shear forces acting between the bottom sheet and the cast concrete.
There is obtained in accordance with the invention an ideal composite floor structure in which the overlying concrete takes- up pressure forces and the bottom sheet of respective sandwich elements takes-up tensile forces. The core of the sandwich element functions in principle as a lightweight pillar which enables a floor structure of appropriate thickness with regard to rigidity and strength to be obtained without being unnecessarily heavy.
It will be understood that it lies within the scope of the inventive concept to exclude the outwardly projecting parts and the engagement means on the top sheet. It will also be understood that the top sheet, core and bottom sheet of the sandwich element may be comprised of materials other than those recited in the aforegoing, without departing from the scope of the invention.
It will also be understood that it lies within the scope of the invention to vary the design of the outwardly projecting parts, with regard to both the bottom sheet and the top sheet. The design of the concrete-engagement means can also be varied, of course, and the illustrated holes may be replaced with tongues, tabs, embossments, fold-overs or the like, for instance.
The top sheet may also be given a profiled structure which enhances its ability to take-up pressure forces that prevail when concrete is being cast. If desired, the top sheet may be provided with embossments over the whole of its surface, with the intention of promoting the coaction between the components of the composite floor structure. If desired, the bottom sheet may also be given a profiled structure and provided with embossments, in addition to that exemplified in the Figures.
As will be understood, the inventive composite floor structure may be further strengthened if necessary, by including reinforcement bars or some other appropriate reinforcement .
The invention is therefore not restricted to the illustrated and described exemplifying embodiments thereof, since changes and modifications can be made within the scope of the following Claims.

Claims

1. A composite floor structure comprising a permanent concrete mould and concrete (90) cast on the mould, characterized in that the mould comprises a plurality of sandwich elements (1; 1' ; 1") .
2. A composite floor structure according to Claim 1, characterized in that respective sandwich elements (1; 1'; 1") include a top sheet (2; 2'; 2"), a core (3; 3'; 3") and a bottom sheet (4; 4' ; 4") .
3. A composite floor structure according to Claim 2, characterized in that the bottom sheet (4; 4'; 4") includes a part (11; 11'; 11") which projects out along the longitudinally extending side-edges of said sheet from the core (3; 3'; 3"); and in that the outwardly projecting part includes means (13; 13' ; 13") for engagement with the cast concrete (90) .
4. A composite floor structure according to Claim 2 or Claim 3, characterized in that the top sheet (2; 2'; 2") includes a part (14; 14'; 14") which projects out from the core (3; 3'; 3") along the longitudinally extending side-edges of said top sheet; and in that the outwardly projecting part includes means (15; 15' ; 15") for engagement with the cast concrete (90) .
5. A composite floor structure according to any one of Claims 2-4, characterized in that the bottom sheets (4; 4' ; 4") of juxtapositioned sandwich elements (1; 1' ; 1") are mutually joined by fastener means.
6. A composite floor structure according to any one of Claims 2-5, characterized in that the core (3; 3') has an undercut (10; 10') along its longitudinally extending side-edges.
7. A composite floor structure according to any one of Claims 3-6, characterized in that the outwardly projecting part (11; 11') of the bottom sheet (4; 4') is terminated with an angled end-part (12; 12' ) .
8. A composite floor structure according to any one of Claims 3-7, characterized in that the concrete engagement means on the bottom sheet (4; 4'; 4") have the form of holes (13; 13'; 13") .
9. A composite floor structure according to any one of Claims 4-8, characterized in that the concrete engagement means on the top sheet (2; 2'; 2") are comprised of holes (15; 15'; 15") .
PCT/SE1995/000756 1994-07-13 1995-06-21 Deck with composite action Ceased WO1996002711A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU29942/95A AU2994295A (en) 1994-07-13 1995-06-21 Deck with composite action
DK199700035A DK174207B1 (en) 1994-07-13 1997-01-10 Tires with the effect of a composite construction
NO970121A NO308144B1 (en) 1994-07-13 1997-01-10 Composite floor construction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9402465A SE506735C2 (en) 1994-07-13 1994-07-13 Collaboration joists, in which a sandwich element was used as a lost form
SE9402465-0 1994-07-13

Publications (1)

Publication Number Publication Date
WO1996002711A1 true WO1996002711A1 (en) 1996-02-01

Family

ID=20394714

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/000756 Ceased WO1996002711A1 (en) 1994-07-13 1995-06-21 Deck with composite action

Country Status (5)

Country Link
AU (1) AU2994295A (en)
DK (1) DK174207B1 (en)
NO (1) NO308144B1 (en)
SE (1) SE506735C2 (en)
WO (1) WO1996002711A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997045604A1 (en) * 1996-05-30 1997-12-04 Plannja Ab A composite deck and a tray therefor
NL1026388C2 (en) * 2004-06-11 2005-12-15 O & P Res And Dev Method for manufacturing a building construction, as well as formwork therefor.
WO2007056833A1 (en) * 2005-11-21 2007-05-24 Bluescope Steel Limited Cast in situ concrete slab
WO2009010994A1 (en) * 2007-07-16 2009-01-22 Metecno S.P.A. Self-supporting panel for building floors, and floor resulting therefrom
CN104032741A (en) * 2014-06-30 2014-09-10 河北省水利工程局 Rapid construction method for large-size temperature control in water conservancy project
CN111851829A (en) * 2020-08-17 2020-10-30 天津竟盛新型建材有限公司 Prefabricated anti-cracking formwork, floor slab and cast-in-place formwork-free slab
CN112211197A (en) * 2020-11-11 2021-01-12 山东省水利科学研究院 Large-volume temperature control rapid construction method for hydraulic engineering

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU782222B2 (en) * 2000-04-06 2005-07-14 Stramit Corporation Pty Limited Improved structural decking

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1256387B (en) * 1959-11-20 1967-12-14 Fond S Batiments Et Travaux Pu Solid ceiling
FR2098568A5 (en) * 1970-07-10 1972-03-10 Catesson Claude
DE2339638B2 (en) * 1973-08-04 1978-06-22 Walter Dr.-Ing. 6101 Rossdorf Sowa Sheet metal shuttering sheet used as reinforcement for a composite concrete ceiling
WO1984002734A1 (en) * 1983-01-03 1984-07-19 Dobel Ab Cassette for casting of framework

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1256387B (en) * 1959-11-20 1967-12-14 Fond S Batiments Et Travaux Pu Solid ceiling
FR2098568A5 (en) * 1970-07-10 1972-03-10 Catesson Claude
DE2339638B2 (en) * 1973-08-04 1978-06-22 Walter Dr.-Ing. 6101 Rossdorf Sowa Sheet metal shuttering sheet used as reinforcement for a composite concrete ceiling
WO1984002734A1 (en) * 1983-01-03 1984-07-19 Dobel Ab Cassette for casting of framework

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997045604A1 (en) * 1996-05-30 1997-12-04 Plannja Ab A composite deck and a tray therefor
NL1026388C2 (en) * 2004-06-11 2005-12-15 O & P Res And Dev Method for manufacturing a building construction, as well as formwork therefor.
US7845138B2 (en) 2004-06-11 2010-12-07 Op-Deck Holdings B.V. Method for the production of a building construction as well as formwork therefor
WO2007056833A1 (en) * 2005-11-21 2007-05-24 Bluescope Steel Limited Cast in situ concrete slab
WO2009010994A1 (en) * 2007-07-16 2009-01-22 Metecno S.P.A. Self-supporting panel for building floors, and floor resulting therefrom
CN104032741A (en) * 2014-06-30 2014-09-10 河北省水利工程局 Rapid construction method for large-size temperature control in water conservancy project
CN111851829A (en) * 2020-08-17 2020-10-30 天津竟盛新型建材有限公司 Prefabricated anti-cracking formwork, floor slab and cast-in-place formwork-free slab
CN112211197A (en) * 2020-11-11 2021-01-12 山东省水利科学研究院 Large-volume temperature control rapid construction method for hydraulic engineering

Also Published As

Publication number Publication date
NO308144B1 (en) 2000-07-31
DK3597A (en) 1997-01-10
DK174207B1 (en) 2002-09-23
NO970121L (en) 1997-01-10
SE506735C2 (en) 1998-02-02
NO970121D0 (en) 1997-01-10
AU2994295A (en) 1996-02-16
SE9402465D0 (en) 1994-07-13
SE9402465L (en) 1996-01-14

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