EP0882852A2 - Systèmes structuraux - Google Patents

Systèmes structuraux Download PDF

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Publication number
EP0882852A2
EP0882852A2 EP98304412A EP98304412A EP0882852A2 EP 0882852 A2 EP0882852 A2 EP 0882852A2 EP 98304412 A EP98304412 A EP 98304412A EP 98304412 A EP98304412 A EP 98304412A EP 0882852 A2 EP0882852 A2 EP 0882852A2
Authority
EP
European Patent Office
Prior art keywords
bracket
bar
assembly
channel
cut
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98304412A
Other languages
German (de)
English (en)
Other versions
EP0882852A3 (fr
Inventor
Roy J. Burns
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.)
Voestalpine Metsec PLC
Original Assignee
Voestalpine Metsec PLC
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 Voestalpine Metsec PLC filed Critical Voestalpine Metsec PLC
Publication of EP0882852A2 publication Critical patent/EP0882852A2/fr
Publication of EP0882852A3 publication Critical patent/EP0882852A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
    • E04D3/36—Connecting; Fastening
    • E04D3/3601—Connecting; Fastening of roof covering supported by the roof structure with interposition of a insulating layer
    • E04D3/3602—The fastening means comprising elongated profiles installed in or on the insulation layer
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
    • E04D3/36—Connecting; Fastening
    • E04D3/3608—Connecting; Fastening for double roof covering or overroofing

Definitions

  • This invention relates to a bar and bracket assembly for use in a wall or roof construction for a building, particularly, but not exclusively, a steel framed building.
  • brackets provide an air gap (usually filled with insulation) between the outer cladding, and a roof or wall membrane supported directly on the roof purlins or wall cross-members.
  • Such arrangements find use particularly where a new roof or wall cladding is to be put in place over an existing roof or wall cladding, the existing roof or wall cladding constituting the aforesaid membrane.
  • the supporting bar prefferably in the form of a re-entrant channel, the two side walls of the channel terminating in inwardly directed flanges partially closing the open face of the channel.
  • British Patent No 2148975 shows such a construction and also discloses that the elongate brackets are engaged with the supporting bar by introducing a head end of the bracket into the open face of the channel, and then rotating the bracket relative to the channel about an axis extending longitudinally of the bracket to engage the flanges of the re-entrant channel in cut-outs at opposite sides respectively of the width of the bracket.
  • a bar and bracket assembly for a roof or wall construction, wherein the bar is in the form of a re-entrant channel-section having integral flanges extending inwardly from each side wall of the channel, the or each bracket has cut-outs in its opposite edges respectively to receive said flanges, and, said flanges are bent, adjacent their inner edges, to define integral webs extending generally parallel to one another in a direction away from the base wall of the channel, said cut-outs in the or each bracket being dimensioned to accommodate said webs.
  • each bracket divides each bracket into a head region which is received within the respective channel-section bar in use, and a body region which spaces the bar from the structural member to which the bracket is secured in use, said head being fitted with a synthetic resin cap providing a thermal break between the material of the bar and the material of the bracket.
  • the head and its cap are so dimensioned in relation to the channel-section of the bar that there is interference between the cap and the interior of the bar when the bracket is rotated about a longitudinal axis to lock the bracket into the bar, said interference preventing rotation of the bracket relative to the bar beyond the locked position, and resisting return rotation.
  • said flanges of said bar extend at right angles to the length of the bracket in use, and the wall of each cut-out of the bracket which lies adjacent the inner surface of the flange is inclined so that the bracket makes contact with each flange adjacent the root of the flange.
  • each cut-out in the bracket is such that any deflection of the flanges which occurs if an attempt is made to withdraw the bracket from the bar brings the free edge of the web of each flange into abutting engagement with the wall of the cut-out.
  • each bracket is formed from strip material and is corrugated longitudinally to provide strengthening formations.
  • the bar 11 of the bar and bracket assembly is an elongate channel-section member formed from cold-rolled mild-steel strip and comprises a base wall 12, and first and second opposite, parallel side walls 13, 14 extending at right angles to the base wall 12, each of the side walls 13, 14 terminating, at its end remote from the base wall 12, in an integral, inturned flange 15, 16, the flanges 15, 16 partially closing the open wall of the channel-section.
  • the flanges 15, 16 extend parallel to the base wall 12 and at its inner end each of the flanges terminates in an integral, outwardly extending web 17, 18 the webs 17, 18 lying parallel to one another and parallel to the side walls 13, 14.
  • the transverse cross-section of the bar 11 is illustrated in Figure 2, and it will be recognised that this cross-section is consistent throughout the whole of the length of the bar 11.
  • the base 12 and/or the side walls 13, 14 are formed with regions extending throughout the length of the bar, and terminating short of the longitudinal edges of the base 12 and/or side walls 13, 14 which have been deformed in the manner described in our co-pending International Patent Application No PCT/GB96/01365 the whole disclosure of which is imported herein by this reference. It is to be understood however that other forms of rigidising deformation of such regions of the base and/or side walls could be utilised to improve the stress characteristics of the bar if desired.
  • Each bar is intended to be utilised with a plurality of identical brackets one of which is illustrated at 21 in the drawings.
  • Each bracket 21 is formed from a length of plane mild-steel strip which has been pressed or stamped to provide the transverse cross-section illustrated in Figure 7 throughout its length.
  • each bracket has a pair of planar marginal regions 22 at opposite lateral edges, the planes of the regions 22 being inclined with respect to one another at an included angle of around 160°.
  • the longitudinally extending central region of the bracket is of M-shaped cross-section comprising first and second parallel, longitudinally extending ribs 23 defining between them a generally V-shaped groove 24 along the centre-line of the bracket.
  • the height of the ribs 23 is such that the free longitudinal edges of the regions 22 and the tops of the ribs 23 are co-planar.
  • Each bracket is formed with a head region 25 at one end and a foot region 26 at the opposite end.
  • an end portion of the strip is bent to form a foot 27 lying at right angles to the length of the bracket and having the inclined marginal regions 22 extending downwardly as illustrated in Figure 4, so that the free edges of the regions 22 of the foot, together with the tops of the ribs 23 define co-planar seating points when the foot is secured to a planar member such as a purlin in use.
  • the regions 22 of the foot are formed, midway along the length of the foot, with apertures for receiving fixing screws for securing the bracket to a purlin, cross-member or the like.
  • an inclined heel region 28 extending at an obtuse angle to the remainder of the length of the bracket and thus at an acute angle to the foot 27.
  • the effect of the heel region 28 is to move the fixing holes in the foot 27 as close as possible to the line of the remainder of the bracket and to minimise offset loadings in the assembly in use.
  • the cold-rolled strip is slotted transversely to provide respective cut-outs 29 in the opposite marginal regions 22.
  • the cut-outs 29 extend across almost the full width of the regions 22 terminating adjacent the commencement of the ribs 23, the cut-outs being of re-entrant dove-tail form adjacent the ribs 23.
  • the regions 22 are cut-off obliquely, and the remaining portions of the regions 22 are bent at right angles, along longitudinally extending lines, to define first and second arms 31 at right angles to the plane in which the free edges of the regions 22 and the tops of the ribs 23 are co-planar.
  • a moulded synthetic resin cap 32 (Figure 8) of generally H-shaped transverse cross-section is engaged over the head region 25 of each bracket, each cap 32 having an internal recess shaped to receive the ribs 23 and arms 31 of the bracket. It can be seen from Figure 8 that the lower outer corner 33 a of one limb of the H-section cap, and the upper outer corner 34 a of the opposite limb of the cap are cut away at 45° to the length of their respective limbs to facilitate rotation of the cap within the channel-section of a bar in use. Moreover, the minimum width of each cut-out 29 (measured in the direction of the length of the bracket) is slightly greater than the width of each web 17 of the respective bar 11.
  • a bracket equipped with a cap 32 is assembled with its respective bar in the following manner.
  • the bracket 31 is orientated relative to the bar 11 such that the width of the bracket is parallel to the length of the bar and the head region 25 of the bracket, carrying the respective cap 32 is introduced between the webs 17, 18 of the bar and is inserted until the free end of the cap 32 abuts the inner face of the base wall 12 of the bar 11.
  • the bracket is rotated about its longitudinal centre line relative to the bar 11 so that the flanges 15, 16 with their integral webs 17, 18 enter the cut-outs 29 beneath the cap 32, and the outer faces of the opposite limbs of the H-section cap 32 abut the inner surface of the side walls 13, 14 of the bar 11.
  • the dimensions of the cap 32 within the bar 11 are such that the cap 32 binds against the inner surfaces of the side walls 13, 14 during such rotation, the cut away corners 33 a , 34 a of the cap 32, distortion of the cap 32, and slight outward flexure of the side walls 13, 14 facilitating rotation of the brackets to the point at which its plane is transverse to the length of the bar. Rotation beyond this point is resisted, it being noted that the opposite corners of the H-section cap have not been cut away so as to constitute abutments resisting rotation of the bracket and cap beyond the 'locked' position in which the opposite faces 33, 34 of the cap abut the inner faces of the side walls 13, 14.
  • each bracket will be secured by screws extending through the regions 22 of the foot, at right angles to the regions 22 and thus extending obliquely into, for example, the purlin or cross-member of the structure to which the bar and bracket assembly is to be secured. It will be recognised that prior to affixing the securing screws through the foot 27, the bracket, already assembled to the respective bar 11 as described above, can, if necessary be slid longitudinally of the bar to adjust the position of the bracket.
  • cladding sheets will be secured by self-tapping screws to the base wall 12 of the bar 11 and it will be recognised that in use wind loading attempting to force the cladding towards the purlin or cross-member to which the brackets are secured will be accepted by abutment of the inner surface of the base wall 12 of the bar 11 with the cap 32, and the loading will be transmitted through the length of the bracket to the purlin or cross-member.
  • the weakest point of the bracket is of course the neck defined by the cut-outs 29 between the main region and the head region of the bracket.
  • the ribs 23 extend continuously through the neck region and so maintain the stiffening and/or strengthening of the bracket in this region thus resisting buckling of the bracket under the imposition of such loading.
  • the screw connections of the cladding to the bar and the brackets to the purlin or cross-member are designed to accommodate predetermined maximum wind loadings.
  • the introduction of self-tapping screws into the deformed region of the base wall 12 is beneficial in this respect as it is found to improve the pull-out resistance of the screw, by comparison with an equivalent screw engaged with plane mild-steel strip of the same gauge.
  • brackets and/or the bars 11 can be formed from galvanised mild-steel, or can be formed by mild-steel which is subsequently treated with paint or other anti-corrosion coatings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
  • Load-Bearing And Curtain Walls (AREA)
EP98304412A 1997-06-05 1998-06-04 Systèmes structuraux Withdrawn EP0882852A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9711523 1997-06-05
GBGB9711523.2A GB9711523D0 (en) 1997-06-05 1997-06-05 Structural systems

Publications (2)

Publication Number Publication Date
EP0882852A2 true EP0882852A2 (fr) 1998-12-09
EP0882852A3 EP0882852A3 (fr) 1999-09-08

Family

ID=10813537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98304412A Withdrawn EP0882852A3 (fr) 1997-06-05 1998-06-04 Systèmes structuraux

Country Status (2)

Country Link
EP (1) EP0882852A3 (fr)
GB (1) GB9711523D0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2369131A (en) * 2000-11-08 2002-05-22 Talfab Holdings Ltd Wall and roof assemblies
EP1298263A3 (fr) * 2001-10-01 2004-02-04 Bryan Atkinson Dispositif pour la fixation d'une toiture
EP1582647A1 (fr) * 2004-04-02 2005-10-05 Euro Clad Limited Système de couverture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148975A (en) 1983-11-05 1985-06-05 Ash & Lacy Plc Wall/roof assemblies
WO1996041691A1 (fr) 1995-06-10 1996-12-27 Metsec Plc Bande metallique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9002612D0 (en) * 1990-02-06 1990-04-04 Ash & Lacy Building Prod Ltd Wall/roof assemblies
KR960009276B1 (en) * 1990-10-18 1996-07-16 Kantan Beauty Ind K K Double joining roof-structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148975A (en) 1983-11-05 1985-06-05 Ash & Lacy Plc Wall/roof assemblies
WO1996041691A1 (fr) 1995-06-10 1996-12-27 Metsec Plc Bande metallique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2369131A (en) * 2000-11-08 2002-05-22 Talfab Holdings Ltd Wall and roof assemblies
EP1298263A3 (fr) * 2001-10-01 2004-02-04 Bryan Atkinson Dispositif pour la fixation d'une toiture
EP1582647A1 (fr) * 2004-04-02 2005-10-05 Euro Clad Limited Système de couverture

Also Published As

Publication number Publication date
EP0882852A3 (fr) 1999-09-08
GB9711523D0 (en) 1997-07-30

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