WO1999067478A1 - Element structurel allonge - Google Patents

Element structurel allonge Download PDF

Info

Publication number
WO1999067478A1
WO1999067478A1 PCT/AU1999/000508 AU9900508W WO9967478A1 WO 1999067478 A1 WO1999067478 A1 WO 1999067478A1 AU 9900508 W AU9900508 W AU 9900508W WO 9967478 A1 WO9967478 A1 WO 9967478A1
Authority
WO
WIPO (PCT)
Prior art keywords
flange
members
web
elongate
box section
Prior art date
Application number
PCT/AU1999/000508
Other languages
English (en)
Inventor
William George Abagi
Original Assignee
Rbs Technologies Holding Company Pty. Limited
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 Rbs Technologies Holding Company Pty. Limited filed Critical Rbs Technologies Holding Company Pty. Limited
Priority to AU44924/99A priority Critical patent/AU4492499A/en
Publication of WO1999067478A1 publication Critical patent/WO1999067478A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
    • B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
    • 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
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
    • 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
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/08—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders
    • E04C3/09—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders at least partly of bent or otherwise deformed strip- or sheet-like material
    • 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
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
    • E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
    • 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
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/043—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the hollow cross-section comprising at least one enclosed cavity
    • 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
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0465—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section square- or rectangular-shaped

Definitions

  • TECHNICAL FIELD This invention relates to an elongate structural member and has been devised particularly though not solely for use as a box section beam.
  • the overlapping C section box beams provide a workable product, they have a number of disadvantages including manufacturing cost due to the necessity to roll each C section separately followed by a joining operation which commonly requires manual handling. Furthermore, it is difficult to provide accurately aligned transverse apertures in the webs of box section beams formed in this way (for the passage of building services, etc.) due to the difficulty in accurately aligning preformed apertures in the manual assembly operation.
  • the present invention therefore provides an elongate structural member formed from sheet metal arranged in an enclosed box section having top and bottom flange members spaced apart by web members, the flange members being formed separately from the web members, the flange members having at least a flange portion extending across the width of the box section and web portions extending from the flange portion, lying against and being fastened to the web members.
  • the flange members are formed from thicker sheet metal than the web members.
  • the web members are provided in the form of side faces of an elongate box section also having top and bottom faces.
  • the elongate box section is formed from a single elongate strip of sheet metal.
  • the flange portions of the flange members lie against the top and bottom faces of the elongate box section.
  • the flange members are enclosed within the elongate box section.
  • the edges of the web portions of the flange members distal from the flange portions are provided with laterally extending edge portions.
  • the web portions of the flange members are fastened to the web members by integral stakes burst through the overlying sheet metal.
  • the invention provides a method of manufacturing an elongate structural member having an enclosed box section, said method comprising the steps of providing an elongate length of sheet metal having notional longitudinal parallel spaced flange areas, separated by notional longitudinal parallel spaced web areas, overlaying elongate sheet metal flange reinforming members over the notional flange areas, and bending the elongate length into a box section having opposing flanges formed by the flange area overlaid by the flange reinforcing members, separated and supported by opposing web members formed by the web areas.
  • the flange reinforcing members are wider than the notional flange areas, overlapping the notional web areas to either side of the notional flange areas and forming sub-web portions overlaying the internal surface of the web members adjacent the flanges when bent into a box section.
  • the method includes the step of fastening the flange reinforcing members to the elongate length of sheet metal in the notional flange areas before bending into the box section.
  • the method includes the step of fastening the flange reinforcing members to the elongate length of sheet metal in the sub-web portions after bending into the box section.
  • the step of fastening the flange reinforcing members to the elongate length of sheet metal comprises punching stakes through the overlapping members.
  • Fig. 1 is a cross section through an assembled elongate structural member according to the invention
  • Fig. 2 is a similar view to Fig. 1 showing the incorporation of aligned apertures in the web members
  • Fig. 3 A is a cross sectional view showing the formation of the box section in a rolling operation with the sheet metal flange reinforcing members overlaid on and fastened to the base elongate length of sheet metal
  • Fig. 3B is a similar view to Fig. 3 A showing the partial forming of the first two corners of the box section
  • Fig. 3C is a similar view to Fig. 3B showing the first two corners of the box section completely formed with the remaining two corners partially formed
  • Fig. 4 is a similar view to Fig. 1 showing an alternative embodiment.
  • the elongate structural member is formed by bending in a cold rolling process from sheet steel, although it will be appreciated that the invention may also be applied to other materials and to other forms of bending e.g. by folding.
  • the finished box section beam as shown in Fig. 1 comprises top and bottom flange members 1 and 2 spaced apart by web members 3 and 4 forming a rectangular hollow box section shape as can be clearly seen in Fig. 1.
  • the profile of the beam may be provided with ribs or other indentations such as those shown at 5 and 6 to improve the structural performance of the beam (as is well known) or for any other desired end use purpose.
  • the beam is generally formed from a single elongate length of sheet metal 7 rolled into the box section shown by the process described below reinforced by separate sheet metal flange reinforcing members 8 and 9.
  • the sheet metal flange reinforcing members extend around the corners 10 of the box section and partway up the web members 3 and 4, forming sub-web portions 11 overlaying the internal surfaces of the web members 3 and 4 adjacent the flanges 1 and 2.
  • the structural performance of the sub-web portions 11 can be further enhanced by providing inwardly turned lips 27 at the free edges of the sub-web portions.
  • the lips 27 give enhanced strength by increasing the buckling resistance of the free edges of the sub-web portions 11 when in compression.
  • the flange reinforcing members 8 and 9 are typically fastened to the adjacent web members by multiple interlocks 12.
  • the interlocks may take the form of any suitable fastener but are typically provided in the form of stakes burst through the overlapping metal areas in the positions shown during the rolling process.
  • Fig. 2 shows a similar view to Fig. 1 in which apertures 13 and 14 are punched into the webs 3 and 4 respectively to form aligned openings through the middle of the box section.
  • Such openings are commonly needed when the beams are used in building construction where it is often necessary to pass building services through the centre of a beam.
  • the web members 3 and 4 are formed from the same elongate length of sheet metal 7 it is possible to form the apertures 13 and 14 during the rolling process and have those apertures accurately aligned, facilitating ease of use in placing building services once the beam is in position.
  • box section beam according to the invention can be formed by any known process, it is typically formed by roll forming over a number of steps, some of which are progressively shown in Figures 3 A, 3B and 3C.
  • Fig. 3 A the elongate length of sheet metal 7 is shown in substantially flat form (before being rolled into a box section) and can be described as having various notional areas which will ultimately be defined in the box section. These areas are generally shown in Fig. 3A as notional flange areas 15 and notional web areas 16. It can be seen that the notional longitudinal parallel spaced flange areas 15 are separated by the notional longitudinal parallel spaced web areas 16.
  • the sheet metal flange reinforcing members 8 are overlaid over the notional flange areas, and in the preferred form of the invention the flange reinforcing members are wider than the notional flange areas, overlapping the notional web areas to either side of the notional flange areas. It is this overlap that ultimately forms the sub-web portions 11 shown in Fig. 1.
  • the flange reinforcing members 8 are secured in the desired location on the sheet metal 7 by punching in locating stakes 28. These stakes are used primarily for location during the roll forming process and have been omitted from Figs. 1 and 2 for clarity.
  • the reinforcing ribs 5 may also be roll formed at this time.
  • the initial corners 17 and 18 are partially formed as shown in Fig. 3B and as the rolling continues, the corners 17 and 18 are formed to 90° as shown in Fig. 3C with corner 19 partially formed.
  • Corner 20 is also partially formed as shown in Fig. 3C and at this point is bent to the stage where the sub-web 21 is substantially parallel to the opposing sub-web 22 on the same flange reinforcing member 8.
  • the corresponding free edges of the flange reinforcing member 8 and the free edge 23 of the elongate sheet metal member have been preformed to leave a gap 24 therebetween, the other free edge 25 of the elongate sheet metal member may then be tucked into the gap 24 as the rolling process completes the corner 19 to a full 90° bend.
  • Free edge 23 is then rolled down on top of free edge 25 forming the overlapping seam 26 shown in Figures 1 and 2.
  • the fastening stakes 12 may then be burst through the overlapping seam portion to complete the box section member.
  • the sub-web portions 11 together with the multiple interlocks 12 also provide web support in shear and bearing by reducing the effective slenderness of the webs 3 and 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

Selon cette invention, on renforce une poutre-caisson possédant des ailes (1 et 2) séparées par des âmes (3 et 4), normalement formées par laminage à froid ou par pliage à partir d'une tôle d'acier, par l'incorporation dans les âmes pendant le laminage à froid ou le pliage d'éléments de renfort (8 et 9) en tôle métallique. Les éléments de renfort s'étendent normalement le long d'une partie des âmes, de manière à renforcer les coins (10); ils sont attachés aux âmes par des fixations (12). On conçoit la poutre en vue de son utilisation optimale par la sélection de l'épaisseur et du classement des éléments de renfort (8 et 9) en tôle métallique.
PCT/AU1999/000508 1998-06-23 1999-06-23 Element structurel allonge WO1999067478A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU44924/99A AU4492499A (en) 1998-06-23 1999-06-23 Elongate structural member

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPP8244 1998-06-23
AUPP824498 1998-06-23

Publications (1)

Publication Number Publication Date
WO1999067478A1 true WO1999067478A1 (fr) 1999-12-29

Family

ID=3812448

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1999/000508 WO1999067478A1 (fr) 1998-06-23 1999-06-23 Element structurel allonge

Country Status (1)

Country Link
WO (1) WO1999067478A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007016735A1 (fr) * 2005-08-08 2007-02-15 Dematic Pty Ltd Poutre d’etagere de rangement
EP1712697A3 (fr) * 2005-04-14 2007-12-05 Zurecon Ag Profilé de montage
AU2006279253B2 (en) * 2005-08-08 2011-12-01 Dematic Pty Ltd A storage rack beam
CN103016947A (zh) * 2012-12-25 2013-04-03 苏州市相城区江南电梯装潢厂 一种加强筋
WO2022167834A1 (fr) * 2021-02-03 2022-08-11 Formsteel Technologies Limited Élément structural en forme de rouleau amélioré

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485594A1 (fr) * 1980-06-30 1981-12-31 Cappelaere Patrice Poutre en caisson, emplie de mousse reprenant le flambage des ames minces
US4580380A (en) * 1983-11-07 1986-04-08 Ballard Derryl R Composite filled interior structural box beams
GB2253223A (en) * 1991-02-26 1992-09-02 Stanley Pritchard Daykin Box beams
WO1997033056A1 (fr) * 1996-03-04 1997-09-12 National Gypsum Company Element structurel composite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485594A1 (fr) * 1980-06-30 1981-12-31 Cappelaere Patrice Poutre en caisson, emplie de mousse reprenant le flambage des ames minces
US4580380A (en) * 1983-11-07 1986-04-08 Ballard Derryl R Composite filled interior structural box beams
GB2253223A (en) * 1991-02-26 1992-09-02 Stanley Pritchard Daykin Box beams
WO1997033056A1 (fr) * 1996-03-04 1997-09-12 National Gypsum Company Element structurel composite

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1712697A3 (fr) * 2005-04-14 2007-12-05 Zurecon Ag Profilé de montage
WO2007016735A1 (fr) * 2005-08-08 2007-02-15 Dematic Pty Ltd Poutre d’etagere de rangement
AU2006279253B2 (en) * 2005-08-08 2011-12-01 Dematic Pty Ltd A storage rack beam
CN103016947A (zh) * 2012-12-25 2013-04-03 苏州市相城区江南电梯装潢厂 一种加强筋
WO2022167834A1 (fr) * 2021-02-03 2022-08-11 Formsteel Technologies Limited Élément structural en forme de rouleau amélioré

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