EP2689075B1 - Système pour renforcer les dalles de béton - Google Patents

Système pour renforcer les dalles de béton Download PDF

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Publication number
EP2689075B1
EP2689075B1 EP12760514.5A EP12760514A EP2689075B1 EP 2689075 B1 EP2689075 B1 EP 2689075B1 EP 12760514 A EP12760514 A EP 12760514A EP 2689075 B1 EP2689075 B1 EP 2689075B1
Authority
EP
European Patent Office
Prior art keywords
steel
slab
concrete
half parts
infill
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.)
Active
Application number
EP12760514.5A
Other languages
German (de)
English (en)
Other versions
EP2689075A4 (fr
EP2689075A1 (fr
Inventor
Mark Allan MANNING
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.)
Entek Pty Ltd
Original Assignee
Entek Pty Ltd
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
Priority claimed from AU2011901064A external-priority patent/AU2011901064A0/en
Application filed by Entek Pty Ltd filed Critical Entek Pty Ltd
Publication of EP2689075A1 publication Critical patent/EP2689075A1/fr
Publication of EP2689075A4 publication Critical patent/EP2689075A4/fr
Application granted granted Critical
Publication of EP2689075B1 publication Critical patent/EP2689075B1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—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
    • 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
    • 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
    • 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
    • E04C5/0645—Shear reinforcements, e.g. shearheads for floor slabs

Definitions

  • the present invention relates to a system for reinforcing concrete slabs.
  • ribbed slabs are used as one of the most efficient slab designs. This is typically due to their utilisation of structural depth and reduction in concrete weight, which is generally derived from the voids which are formed between the ribbed beam elements.
  • Permanent steel (usually cold rolled) formwork systems which act compositely with the in-situ concrete, also offer additional efficiencies due to the designs using almost every component of the system both before and after construction.
  • ribbed slabs have typically been constructed using pre-cast or formed concrete beams with an in-situ slab infill between, or by using composite structural steel formwork, which is made from various cold rolled steel sheet profiles.
  • the steel sheet profile slabs are typically only one directional in their strength characteristics.
  • WO 94/01636 for example, describes a composite construction having a beam part and, bearing thereon, a slab part.
  • the construction includes at least a metal mantle of the beam part, a cast component (such as concrete), and additional reinforcement components positioned inside the cast component.
  • LU 84596 discloses a system for reinforcing a concrete slab according to the preamble of claim 1 and describes a process for making a girder which consists of utilizing an exterior metal casing jointly as boxing and as a frame and filling it with concrete. According to the process one makes the exterior metal casing or frame in a U shape made from 2 metal sheets folded in the shape of an L and placed side by side and interlocked.
  • the present invention seeks to substantially overcome, or at least ameliorate, one or more disadvantages of existing arrangements.
  • the present invention provides a system for reinforcing a concrete slab as defined in claims 1 to 5.
  • Figures 1A to 1C show an example system for connecting a beam to a slab and some example beam profiles.
  • the examples in the Figures show a concrete slab 100 connected to a light gauge steel beam section 115.
  • the slab 100 is connected to the steel beam section by one or more shear connectors 125 and 120 (anchoring elements).
  • the system described herein can include a ribbed slab system incorporated in a typical structural flooring application, including supporting elements.
  • the shear connector location is, in the examples described herein, on top inwardly directed flanges of the steel beam 115. This can allow for the connector 125 to act as both an infill fastener and a concrete/steel beam shear connector.
  • the steel beam section 115 includes sides and flanges where the preferred shear connector 125 location is on the top flanges, with additional shear connectors 120 configured on the sides and bottom flange, in order to connect the steel beam to the concrete slab 100.
  • the system described herein can also include a metal infill sheet 130, where the infill sheet 130 can also be connected to the slab 100 by one or more connectors (or anchoring elements) 125.
  • Figure 1B also shows that in-situ concrete 135 can be used with the system described herein.
  • slab reinforcements 140 can also be used, and the system can include a zone 142 for post-tensioning ducts and/or additional reinforcement, as required.
  • Figure 1C shows that flashing 145, or void fillers, or formwork, can be used between steel beam sections 115, as required.
  • Figure 1C shows the conventional formwork system at 150, and Figure 1A also shows that propping 155 can occur as required, where the number and spacing of the propping lines can vary.
  • FIGS 2A to 4D show variations of the example system described herein.
  • Figure 2C shows a variation including a steel support beam 210 and shear studs 200, used as required.
  • Figure 3C shows the steel support beam 210 including support angles 310, as required.
  • Figure 4C shows the use of a wall support 410.
  • the slab 100 is a concrete slab
  • the shear connectors 125 and 120 can be steel screw bolts, rivets, shear studs or the like.
  • the beam according to the present invention is formed of two half parts.
  • the two beams may be fastened together to provide a desired profile (or "double beam" profile).
  • Figure 5A shows the profile of a steel beam formed by two identical half parts 500, 501.
  • a plate 503 is screw fastened to corresponding flanges 504, 505 of the two half parts 500, 501 fastening them together.
  • Figure 5B shows the profile of one half part 500 from figure 5A .
  • the advantage of using a double beam profile is that it allows an increase the overall depth and width of the section, which would otherwise not be possible using commonly available steel coil widths.
  • the two half parts may be fastened together by other means, such as, for example, welding, crimping or using screws rivets, bolts or the like (See figures 6A-6D ).
  • the presently described system can utilise the inherent strength of the steel formwork at all stages of the design life of the floor, from before the pour of the in-situ concrete slab to the end of the design life of the structure.
  • the system described herein can use the steel of the beams (ribs) both as formwork, but also as an integral part of the reinforcement of the composite concrete ribbed slab.
  • the steel shell of the rib acts as part (or all) of the bottom longitudinal and the vertical shear reinforcement. Transverse reinforcement may be required, and this can be achieved via reinforcement placed within the in-situ concrete.
  • the steel beams can be standard commercially available steel "C” Purlins, or custom made steel sections, as required. Notably, the use of custom made sections can improve the characteristics of the system, but are not a necessary requirement.
  • the steel beams can also enable the metal infill to maximize its spanning capability by shortening the effective span of the infill. They act with the in-situ concrete and the shear connectors to form a composite unit utilizing the above-described materials.
  • the shear connectors can be implemented as screws which act as both infill sheet fasteners and composite action shear connectors. It will be appreciated that the screw connectors may be substituted with bolts, rivets, shear studs or the like located in pre-drilled, or pre-punched holes. Additional screws, bolts, rivets, shear studs or the like may be installed as required by the design.
  • the shear connectors can be used to bring the system all together, enabling the metal infill, steel beams and in-situ concrete to act together as a unit during the various design stages of a structure.
  • folded steel flashing can be used to close the space between the metal infill and a supporting surface. Flashing can also provide sound and fire separation by setting down the slab over load bearing and non load bearing walls (refer to the Figures) for further system details.
  • the flashing can close off gaps at end supports to control the flow of the in-situ concrete slab during the concrete pour.
  • the flashing can, in one example, keep the concrete from pouring out the ends of the deck during a concrete pour.
  • flashing is typically light weight, commercially available, easy to handle, and cost effective.
  • any commercially available sheet metal may be used for the flashing. It will be appreciated that void fillers or formwork may also be used in place of steel flashing.
  • system described herein can be either partially assembled off site or fully assembled on-site.
  • the light gauge steel beams arrive on-site already connected to the metal infill. These component sections are then laid out on the supporting elements at the required centres. Alternate infill sheets are then placed and fastened between the pre-assembled beam elements. Steel flashing is then installed as required to close the space between the infill sheets and the supporting structure.
  • the light steel beams and metal infill arrive on-site separately.
  • the system is installed by first placing the steel beams onto the supporting elements at the required centres.
  • the metal infill sheets are fastened to the beam elements and, as with the first case, steel flashing is then used to close the space between the infill sheets and the supporting structure.
  • steel flashing is then used to close the space between the infill sheets and the supporting structure.
  • the number, size and spacing of any shear connectors, required to achieve full composite action, will vary depending on the design. These connectors can be installed either on or off site.
  • This propping will generally consist of (but not limited to) standard propping frames and header beams.
  • Additional reinforcement such as, for example, stressing wires/tendons, bar, mesh or fibre reinforcement, may be added to the system, as required by the design.
  • the in-situ concrete interacts with the shear connectors, so as to facilitate the transfer of internal shear forces between the concrete, shear connectors and the light gauge steel beams.
  • This transfer of shear forces enables the slab to act as a fully composite concrete/light gauged steel ribbed slab system.
  • the system described herein can maximise the composite actions between the steel beams and the in-situ concrete above and within the beam element.
  • This composite action can be achieved through the longitudinal shear connection detail of the steel beams to the in-situ concrete and the metal infill sheeting.
  • the connection detail between the metal infill sheets and the steel beams is also utilised during construction, which can also maximise the system's un-propped span length.
  • the slab system can include commercially available structural steel formwork (metal infill sheets) spanning between the steel beam sections, which in themselves also act as an integral part of the formwork system.
  • a reinforced in-situ concrete slab is poured over the deck, and can act compositely with all elements of the formwork system.
  • the composite action can be achieved principally via the connection of the metal infill sheets to the steel beams via steel screws, plus any additional connectors between the beam and the in-situ slab as required by the design.
  • the screw connectors may be substituted with bolts, rivets, shear studs or the like.

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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)
  • Joining Of Building Structures In Genera (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Claims (5)

  1. Système de renforcement d'une dalle de béton (100) incluant :
    un coffrage incluant au moins une poutre allongée (115), la poutre (115) incluant :
    un canal pour recevoir un mélange de béton dans celui-ci de sorte qu'une nervure soit formée dans la dalle de béton (100) ; et
    au moins un élément en saillie dans le canal pour l'engagement du mélange de béton de sorte qu'une fois le mélange de béton durci, la poutre (115) soit ancrée à la dalle,
    dans lequel la poutre (115) est formée de deux parties de moitié de poutre (500, 501) fixées ensemble, chaque partie de moitié de poutre (500, 501) présentant une paroi de base reliant une paroi latérale intérieure et une paroi latérale extérieure, et
    dans lequel les parties de moitié de poutre (500, 501) sont fixées ensemble de sorte que des parois latérales intérieures de chaque partie de moitié soient alignées les unes contre les autres, et les parois latérales extérieures et les bases des parties de moitié respectivement fournissent respectivement les parois latérales et la base du canal, les parois latérales intérieures des parties de moitié fournissant ainsi une tige centrale à l'intérieur du canal,
    caractérisé en ce que
    chaque partie de moitié de poutre (500, 501) présente une bride supérieure (504, 505) s'étendant depuis le dessus de sa paroi latérale intérieure vers sa paroi latérale extérieure, et les parties de moitié de poutre sont fixées ensemble avec des moyens de fixation reliant les brides supérieures (504, 505), et
    dans lequel les brides supérieures (504, 505) des parties de moitié de poutre (500, 501) et la tige centrale fournissent une section transversale sensiblement en forme de T dans le plan perpendiculaire à l'axe allongé de l'élément de poutre.
  2. Système selon la revendication 1, dans lequel les parties de moitié de poutre sont fixées ensemble par une plaque de connecteur (503) qui est fixée à chaque bride supérieure avec des vis qui s'étendent à travers la plaque (503) et les brides supérieures (504, 505).
  3. Système selon la revendication 1 ou 2, dans lequel le coffrage inclut deux poutres (115) ou plus reliées en alternance à au moins une feuille de remplissage (130).
  4. Système selon l'une quelconque des revendications 1 à 3, dans lequel le système fournit une résistance au feu à la dalle de béton.
  5. Système selon l'une quelconque des revendications 1 à 4, dans lequel la poutre est formée d'acier.
EP12760514.5A 2011-03-23 2012-03-23 Système pour renforcer les dalles de béton Active EP2689075B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2011901064A AU2011901064A0 (en) 2011-03-23 A method and system for connecting a slab to a beam
PCT/AU2012/000307 WO2012126065A1 (fr) 2011-03-23 2012-03-23 Poutre et procédé permettant de renforcer des dalles en béton

Publications (3)

Publication Number Publication Date
EP2689075A1 EP2689075A1 (fr) 2014-01-29
EP2689075A4 EP2689075A4 (fr) 2014-08-20
EP2689075B1 true EP2689075B1 (fr) 2017-04-19

Family

ID=46878548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12760514.5A Active EP2689075B1 (fr) 2011-03-23 2012-03-23 Système pour renforcer les dalles de béton

Country Status (4)

Country Link
US (1) US20140298749A1 (fr)
EP (1) EP2689075B1 (fr)
AU (1) AU2012231786B2 (fr)
WO (1) WO2012126065A1 (fr)

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
JP7185616B2 (ja) * 2017-02-28 2022-12-07 株式会社竹中工務店 鉄骨コンクリート梁の施工方法、及び鉄骨コンクリート梁の設計方法
SG11201907585PA (en) * 2017-02-28 2019-09-27 Takenaka Corp Steel form
US10196818B1 (en) * 2017-03-07 2019-02-05 Olga Martell Device for building concrete roofs and method
AU2020245901A1 (en) * 2019-03-26 2021-10-28 Csr Building Products Limited Flooring system
CN210828439U (zh) * 2019-09-29 2020-06-23 丰和营造集团股份有限公司 一种建筑物到期前混凝土架空层加固结构

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Also Published As

Publication number Publication date
EP2689075A4 (fr) 2014-08-20
WO2012126065A1 (fr) 2012-09-27
EP2689075A1 (fr) 2014-01-29
US20140298749A1 (en) 2014-10-09
AU2012231786B2 (en) 2017-05-04
AU2012231786A1 (en) 2013-10-10

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