EP1371794A1 - Improvements in a self-supporting lattice to provide steel-concrete composite beams for housing and industrial building - Google Patents

Improvements in a self-supporting lattice to provide steel-concrete composite beams for housing and industrial building Download PDF

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Publication number
EP1371794A1
EP1371794A1 EP03425377A EP03425377A EP1371794A1 EP 1371794 A1 EP1371794 A1 EP 1371794A1 EP 03425377 A EP03425377 A EP 03425377A EP 03425377 A EP03425377 A EP 03425377A EP 1371794 A1 EP1371794 A1 EP 1371794A1
Authority
EP
European Patent Office
Prior art keywords
lattice
stringers
concrete
lattice according
posts
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
Application number
EP03425377A
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German (de)
French (fr)
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EP1371794B1 (en
Inventor
Franco Mangione
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.)
TECHNOSTUDI SRL
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Tecnostudi Srl
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Publication of EP1371794A1 publication Critical patent/EP1371794A1/en
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Publication of EP1371794B1 publication Critical patent/EP1371794B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/065—Light-weight girders, e.g. with precast parts
    • E04C5/0653—Light-weight girders, e.g. with precast parts with precast parts
    • 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
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E04B5/29—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated the prefabricated parts of the beams consisting wholly of metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete

Definitions

  • the present invention relates to the field of prefabricated construction elements generally for building and more particularly an improved self-supporting lattice to provide steel-concrete composite beams for housing and industrial building.
  • Beams for building with a composite steel-concrete construction have typically the shape of a reversed T and consist of a large lower plate or sole, several posts perpendicular thereto, and one or more stringers along the top of such posts. Such constructions are embodied upon installation into the concrete casting except for the intrados of the base plate which is subjected to weather and fire.
  • the main object of the invention is to provide a composite beam of the type mentioned above with a lattice fully embodied in the concrete casting and characterized by a base of concrete reinforced with plastic and/or steel fibres able to avoid the need for provisional moulds during the installation.
  • the upper girder of the lattice consists of three or more stringers 1 with a circular or square cross section laying on a plane parallel to the horizontal plane of the base. Such stringers are assembled in pairs each of them engages the upper end of a post 3. Spacers 2 are interposed between each pair of stringers at such upper end of the posts and have the same shape and size as the connected stringers.
  • the lower girder consists of four or more stringers 4 with a circular or square cross section laying on the horizontal plane of the base. They are made integral with posts 3 too in the same way as in the upper girder. The stringers 4 of the lower girder are also assembled in pairs each of them engages the lower end of the posts 3.
  • the reinforcing fibres mixed to the concrete of the bottom give the latter an even limited tensile strength in order to prevent damages or cracks in the bottom which would cause problems in the mechanical strength and/or fire resistance.
  • the bottom is provided with a little upper mould consisting of side holding walls C to which longitudinal L-shaped section bars 8 supported by cross bars 7 connected to posts 3 are secured.
  • the invention provides several cross irons 5 welded to the lower stringers 4.
  • posts 3 have their lower ends together with the lower stringers 4 embodied in the bottom or base F of concrete reinforced with plastic fibres. It should be appreciated that the particular shape of the mould according to the present invention makes the use of any through bolt which would impair the fire resistance unnecessary.
  • Figure 2 shows a simplified embodiment of the invention in which the lattice is not embodied in the bottom of concrete reinforced with fibres but it is applied directly to the bottom in factory.
  • bottom F is provided with longitudinal supporting bars 6 which are integral with the above-mentioned cross irons 5 welded to the lower stringers 4 and are able to make bottom F integral with the lattice.
  • U-shaped cross brackets 9 are also provided which help to make the bottom integral with the casting of the beam and the relative floor.
  • bottom F in order to allow bottom F to be secured to the lattice of the beam, the upper side of bottom F is provided with a plurality of nuts D "embodied" in the bottom in suitable positions and engaging corresponding bolts B which tighten cross irons 5, thus connecting the bottom to the lower stringers of the lattice.
  • such bolts are not through bolts but are embodied in the bottom so that the fire protection is ensured.
  • Still a further advantage of the present invention consists in that the use of a base reinforced with plastic fibres allows a provisional mould of the lower portion of the beam to be avoided. Moreover, fire protection can be either applied in factory or during the installation.
  • the lattice is preferably provided with a rise in factory which is annulled during the installation under the action of the above-mentioned loads.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Building Environments (AREA)

Abstract

An improved self-supporting lattice to provide steelconcrete composite beams characterized in that it is fully embodied in the concrete casting and provided with a base or bottom of concrete reinforced with plastic and/or steel fibres able to avoid the need for provisional moulds during the installation.
The fibres reinforcing the concrete of the bottom have also the function of giving the latter an even limited tensile strength, thus preventing damages and cracks in the bottom which would cause problems in the mechanical resistance and/or fire resistance.

Description

  • The present invention relates to the field of prefabricated construction elements generally for building and more particularly an improved self-supporting lattice to provide steel-concrete composite beams for housing and industrial building.
  • Beams for building with a composite steel-concrete construction have typically the shape of a reversed T and consist of a large lower plate or sole, several posts perpendicular thereto, and one or more stringers along the top of such posts. Such constructions are embodied upon installation into the concrete casting except for the intrados of the base plate which is subjected to weather and fire.
  • The main object of the invention is to provide a composite beam of the type mentioned above with a lattice fully embodied in the concrete casting and characterized by a base of concrete reinforced with plastic and/or steel fibres able to avoid the need for provisional moulds during the installation.
  • The invention will now be described with reference to the accompanying drawings that show a preferred embodiment and some variations thereof only by way of an illustrative, not limiting example.
  • In the drawings:
  • Figure 1 shows a section view of a beam with a lattice embodied in the bottom;
  • Figure 2 shows another embodiment of the invention in which the lattice is applied directly into the bottom in factory; and
  • Figure 3 similar to the preceding one shows a further embodiment in which the lattice is applied to the bottom during the installation.
  • With reference to the Figures, the upper girder of the lattice consists of three or more stringers 1 with a circular or square cross section laying on a plane parallel to the horizontal plane of the base. Such stringers are assembled in pairs each of them engages the upper end of a post 3. Spacers 2 are interposed between each pair of stringers at such upper end of the posts and have the same shape and size as the connected stringers.
  • The lower girder consists of four or more stringers 4 with a circular or square cross section laying on the horizontal plane of the base. They are made integral with posts 3 too in the same way as in the upper girder. The stringers 4 of the lower girder are also assembled in pairs each of them engages the lower end of the posts 3.
  • According to a peculiar feature of the invention, the reinforcing fibres mixed to the concrete of the bottom give the latter an even limited tensile strength in order to prevent damages or cracks in the bottom which would cause problems in the mechanical strength and/or fire resistance.
  • In the first embodiment shown in Figure 1, the bottom is provided with a little upper mould consisting of side holding walls C to which longitudinal L-shaped section bars 8 supported by cross bars 7 connected to posts 3 are secured.
  • Moreover the invention provides several cross irons 5 welded to the lower stringers 4.
  • In this first embodiment, posts 3 have their lower ends together with the lower stringers 4 embodied in the bottom or base F of concrete reinforced with plastic fibres. It should be appreciated that the particular shape of the mould according to the present invention makes the use of any through bolt which would impair the fire resistance unnecessary.
  • Figure 2 shows a simplified embodiment of the invention in which the lattice is not embodied in the bottom of concrete reinforced with fibres but it is applied directly to the bottom in factory.
  • As can be seen in the above Figure, bottom F is provided with longitudinal supporting bars 6 which are integral with the above-mentioned cross irons 5 welded to the lower stringers 4 and are able to make bottom F integral with the lattice.
  • According to the latter embodiment, U-shaped cross brackets 9 are also provided which help to make the bottom integral with the casting of the beam and the relative floor.
  • Turning now to Figure 3 showing a second embodiment of the invention, it should be noted that in order to allow bottom F to be secured to the lattice of the beam, the upper side of bottom F is provided with a plurality of nuts D "embodied" in the bottom in suitable positions and engaging corresponding bolts B which tighten cross irons 5, thus connecting the bottom to the lower stringers of the lattice.
  • According to a further peculiar feature of the present invention, such bolts are not through bolts but are embodied in the bottom so that the fire protection is ensured.
  • The advantages of the construction according to the invention are self-evident from the foregoing:
  • a) full compatibility with any type of floor with prefabricated beams of vibrated reinforced concrete and prestressed reinforced concrete as well as stringers and plates, as it needs no props upon assembling and casting the moulds;
  • b) the particular shape of the lower girder, i.e. its permeability to the casting of concrete, gives the lattice the capability of being fully embodied and protected into the mix;
  • c) exclusive use of steel stringers with circular or square cross section assembled in factory by welding;
  • d) loading capacity such as to allow the following loads without props:
    • dead load of the lattice,
    • load of the moulds anchored and braced to lattice,
    • dead load of the dry laid floor,
    • accidental overload from the trampling of the staff for the floor reinforcement,
    • load of the finishing casting (lattice and floor).
  • Still a further advantage of the present invention consists in that the use of a base reinforced with plastic fibres allows a provisional mould of the lower portion of the beam to be avoided. Moreover, fire protection can be either applied in factory or during the installation.
  • The lattice is preferably provided with a rise in factory which is annulled during the installation under the action of the above-mentioned loads.
  • The present invention has been described and illustrated according to preferred embodiments thereof, however, it should be understood that those skilled in the art can make modifications without departing from the scope of the present industrial invention.

Claims (11)

  1. An improved self-supporting lattice to provide steel-concrete composite beams characterized in that it is fully embodied in the concrete casting and provided with a base or bottom (F) of concrete reinforced with plastic and/or steel fibres able to avoid the need for provisional moulds during the installation, said fibres reinforcing the concrete of the bottom (F) having also the function of giving the latter an even limited tensile strength, thus preventing damages and cracks in the bottom which would cause problems in the mechanical resistance and/or fire resistance.
  2. The lattice according to claim 1, characterized in that it includes an upper girder consisting of three or more stringers (1) with a circular or square cross section laying on a plane parallel to the horizontal plane of the base, said stringers being secured to the upper ends of posts (3).
  3. The lattice according to claim 1, characterized in that it includes a lower girder consisting of four or more stringers (4) with a circular or square cross section laying on the horizontal plane of the base of the lattice which are made integral with posts (3), said stringers (4) of the lower girder being assembled in pairs, each of them engaging the lower end of the posts (3).
  4. The lattice according to claim 2 or 3, characterized in that the bottom (F) is provided with a little upper mould consisting of side holding walls (C) to which longitudinal L-shaped section bars (8) supported by cross bars (7) connected to posts (3) are secured.
  5. The lattice according to any claim from 2 on, characterized in that several cross irons (5) welded to the lower stringers (4) are provided.
  6. The lattice according to any claim from 2 on, characterized in that posts (3) have their lower ends together with the lower stringers (4) embodied in the bottom or base (F) of concrete reinforced with plastic fibres.
  7. The lattice according to any claim from 2 on, characterized in that it is applied directly in factory to the bottom (F) of concrete reinforced with fibres.
  8. The lattice according to the preceding claim, characterized in that bottom (F) is provided with longitudinal supporting bars (6) which are integral with cross irons (5) welded to the lower stringers (4) and are able to make bottom (F) integral with the lattice.
  9. The lattice according to any claim 2 to 5, characterized in that in order to allow bottom (F) to be secured to the lattice of the beam, the upper side of bottom (F) is provided with a plurality of nuts (D) "embodied" in the bottom in suitable positions and engaging corresponding bolts (B) which tighten cross irons (5), thus connecting the bottom to the lower stringers of the lattice.
  10. The lattice according to the preceding claim, characterized in that said bolts are not through bolts but are embodied in the bottom so that the fire protection is ensured.
  11. The lattice according to any claim from 6 on, characterized in that U-shaped cross brackets (9) are further provided which help to make the bottom integral with the casting of the beam and the relative floor.
EP03425377A 2002-06-14 2003-06-11 Self-supporting lattice to provide steel-concrete composite beams for housing and industrial building Expired - Lifetime EP1371794B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2002RM000336A ITRM20020336A1 (en) 2002-06-14 2002-06-14 IMPROVEMENTS TO A SELF-SUPPORTING LATERAL TRUSS, FOR THE CONSTRUCTION OF MIXED STEEL-CONCRETE BEAMS FOR CIVIL BUILDING AND I
ITRM20020336 2002-06-14

Publications (2)

Publication Number Publication Date
EP1371794A1 true EP1371794A1 (en) 2003-12-17
EP1371794B1 EP1371794B1 (en) 2006-09-13

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ID=11456368

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Application Number Title Priority Date Filing Date
EP03425377A Expired - Lifetime EP1371794B1 (en) 2002-06-14 2003-06-11 Self-supporting lattice to provide steel-concrete composite beams for housing and industrial building

Country Status (5)

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EP (1) EP1371794B1 (en)
AT (1) ATE339566T1 (en)
DE (1) DE60308261T2 (en)
ES (1) ES2269964T3 (en)
IT (1) ITRM20020336A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003204314B1 (en) * 2003-05-25 2004-11-18 Bendtsen, Bo Mr Precast spanning floor system using steel fibre reinforced concrete
EP1669505A1 (en) * 2004-12-02 2006-06-14 Velthorst Beheer B.V. Steel-concrete composite joist with fire-resistant support for ceiling elements
EP1752596A2 (en) * 2005-08-08 2007-02-14 Tecnostrutture SRL Mixed-type self-supporting beam and relative method of production
ITUD20080179A1 (en) * 2008-07-30 2010-01-31 Tecnostrutture S R L CARRYING BEAM WITH MIXED STRUCTURE
ITUD20090002A1 (en) * 2009-01-07 2010-07-08 Tecnostrutture S R L CARRYING BEAM WITH MIXED STRUCTURE
CN101899877A (en) * 2009-05-19 2010-12-01 柳忠林 Small simulate framework structure of long-span prestress concrete girder slab
CN102061770A (en) * 2010-03-03 2011-05-18 柳忠林 Construction method for imitated frame structure of long-span prestressed concrete beam slab
WO2016037864A1 (en) * 2014-09-08 2016-03-17 Technische Universität Wien Double wall made of high-strength or ultra-high-strength reinforced concrete
CN106088480A (en) * 2016-06-15 2016-11-09 杭州材智建筑科技有限公司 Girder truss, the combination beam of application girder truss and the compound superstructure of application girder truss
CN113882569A (en) * 2021-10-09 2022-01-04 西南科技大学 Assembled UHPC steel bar truss laminated slab and manufacturing method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL136703C (en) * 1900-01-01
GB854575A (en) * 1958-01-15 1960-11-23 A V I Alpenlandische Veredelun Improvements relating to girders
AT360722B (en) * 1978-05-08 1981-01-26 Bucher Franz REINFORCEMENT ELEMENT FOR A STEEL CONCRETE STRUCTURAL COMPONENT
GB2077792A (en) * 1980-03-22 1981-12-23 Tinsley Building Prod Ltd Casting reinforced concrete floors
FR2712326A1 (en) * 1993-11-09 1995-05-19 Fimurex Partially prefabricated reinforced concrete construction element
DE29906967U1 (en) * 1999-04-19 1999-08-12 Ritter, Karl Konrad, 57518 Betzdorf formwork

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL136703C (en) * 1900-01-01
GB854575A (en) * 1958-01-15 1960-11-23 A V I Alpenlandische Veredelun Improvements relating to girders
AT360722B (en) * 1978-05-08 1981-01-26 Bucher Franz REINFORCEMENT ELEMENT FOR A STEEL CONCRETE STRUCTURAL COMPONENT
GB2077792A (en) * 1980-03-22 1981-12-23 Tinsley Building Prod Ltd Casting reinforced concrete floors
FR2712326A1 (en) * 1993-11-09 1995-05-19 Fimurex Partially prefabricated reinforced concrete construction element
DE29906967U1 (en) * 1999-04-19 1999-08-12 Ritter, Karl Konrad, 57518 Betzdorf formwork

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003204314B1 (en) * 2003-05-25 2004-11-18 Bendtsen, Bo Mr Precast spanning floor system using steel fibre reinforced concrete
EP1669505A1 (en) * 2004-12-02 2006-06-14 Velthorst Beheer B.V. Steel-concrete composite joist with fire-resistant support for ceiling elements
EP1752596A2 (en) * 2005-08-08 2007-02-14 Tecnostrutture SRL Mixed-type self-supporting beam and relative method of production
EP1752596A3 (en) * 2005-08-08 2007-12-05 Tecnostrutture SRL Mixed-type self-supporting beam and relative method of production
ITUD20080179A1 (en) * 2008-07-30 2010-01-31 Tecnostrutture S R L CARRYING BEAM WITH MIXED STRUCTURE
ITUD20090002A1 (en) * 2009-01-07 2010-07-08 Tecnostrutture S R L CARRYING BEAM WITH MIXED STRUCTURE
CN101899877A (en) * 2009-05-19 2010-12-01 柳忠林 Small simulate framework structure of long-span prestress concrete girder slab
CN101899877B (en) * 2009-05-19 2014-07-16 柳忠林 Small simulate framework structure of long-span prestress concrete girder slab
CN102061770A (en) * 2010-03-03 2011-05-18 柳忠林 Construction method for imitated frame structure of long-span prestressed concrete beam slab
CN102094458A (en) * 2010-03-03 2011-06-15 柳忠林 Simulated frame structure of long-span prestressed concrete slab
WO2016037864A1 (en) * 2014-09-08 2016-03-17 Technische Universität Wien Double wall made of high-strength or ultra-high-strength reinforced concrete
CN106088480A (en) * 2016-06-15 2016-11-09 杭州材智建筑科技有限公司 Girder truss, the combination beam of application girder truss and the compound superstructure of application girder truss
CN106088480B (en) * 2016-06-15 2018-08-24 杭州材智建筑科技有限公司 Girder truss, the combination beam using girder truss and the compound superstructure using girder truss
CN113882569A (en) * 2021-10-09 2022-01-04 西南科技大学 Assembled UHPC steel bar truss laminated slab and manufacturing method thereof

Also Published As

Publication number Publication date
EP1371794B1 (en) 2006-09-13
ES2269964T3 (en) 2007-04-01
ITRM20020336A0 (en) 2002-06-14
DE60308261D1 (en) 2006-10-26
DE60308261T2 (en) 2007-08-30
ITRM20020336A1 (en) 2003-12-15
ATE339566T1 (en) 2006-10-15

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