WO2005061816A1 - Structure de plate-forme de travail et dispositif de securite associe - Google Patents

Structure de plate-forme de travail et dispositif de securite associe Download PDF

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Publication number
WO2005061816A1
WO2005061816A1 PCT/GB2004/005277 GB2004005277W WO2005061816A1 WO 2005061816 A1 WO2005061816 A1 WO 2005061816A1 GB 2004005277 W GB2004005277 W GB 2004005277W WO 2005061816 A1 WO2005061816 A1 WO 2005061816A1
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WO
WIPO (PCT)
Prior art keywords
platform
upright member
trestle
lower section
members
Prior art date
Application number
PCT/GB2004/005277
Other languages
English (en)
Inventor
John Isaac Riley
Stephen Leslie Brown
Nigel Kenneth Wright
Original Assignee
John Isaac Riley
Stephen Leslie Brown
Nigel Kenneth Wright
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 GB0329845A external-priority patent/GB2409491B/en
Priority claimed from GB0406538A external-priority patent/GB0406538D0/en
Application filed by John Isaac Riley, Stephen Leslie Brown, Nigel Kenneth Wright filed Critical John Isaac Riley
Publication of WO2005061816A1 publication Critical patent/WO2005061816A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/28—Scaffolds primarily resting on the ground designed to provide support only at a low height
    • E04G1/32—Other free-standing supports, e.g. using trestles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00—Component parts or accessories for scaffolds
    • E04G5/14—Railings
    • E04G5/141—Railings with an access door or the like therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
    • E04G2001/248—Inclined struts

Definitions

  • This invention relates to work platform structures and in particular to safety arrangements therefor.
  • the invention is primarily, but not exclusively, concerned with low-level platform structures, often called bandstands or trestles, and improving user safety insofar as this may be achieved by providing one or more guard rails to prevent user and/or object from falling from the structure platform and improving the stability of the platform structure against toppling, particularly as a result of providing such guard rail or rails at a relatively high position.
  • Patent specification GB-A-2364733 sets out the nature of low level platform structures in the form of building trestles, that is, where discrete trestle units, each comprising leg units and horizontal cross beams, are spaced apart and joined by decking planks to define a platform at which a workman, such as a bricklayer, can work above ground level and receive materials temporarily stored on the platform as work progresses. It is usual, but by no means essential, for such work platforms to be adjustable in height, either to provide access to specific work or continued access as a piece of work, such as a wall, grows in height from the ground.
  • the sought-after safety against falling from the platform given by the rails is compromised by shifting of the centre of gravity of the railed platform structure itself.
  • a user who hitherto would usually be reluctant to place himself or materials close to the edge of the platform, thereby tending to keep the centre of gravity of the platform well inboard of the feet, may choose to make use of the platform right up to the edge protected by the safety rails, and possibly contribute further to instability of the platform structure in respect of toppling about the trestle supporting feet as a fulcrum.
  • One embodiment described therein addresses the issue of stability by having safety rail-mounting uprights standing on the ground adjacent the trestle supporting legs and secured thereto by clamps, so as to provide with the horizontal safety rails enhanced rigidity of the overall structure, and providing the ground-supported uprights with braced feet extending away from the platform to displace a turning fulcrum further from the platform.
  • some users within the industry feel concern regarding such extending feet as potential accident sources, as a near ground level hazard that may cause tripping or being vulnerable to impact by heavy machinery, putting platform users at renewed risk.
  • trestle structure discussed in GB-A-2364733 and GB-A-2378978 is only one form of platform structure for which similar safety considerations apply.
  • a trestle configuration may exist in which the characteristic features of individual and essentially two dimensional trestles, supporting legs and cross beam, are formed in a three-dimensional structure equivalent to such trestles connected fixedly to each other below the platform level rather than as discrete items, and to this end it is considered appropriate to refer herein in a general sense to a work platform structure consisting of spaced apart trestle configurations, which configurations include inter alia, discrete trestles.
  • a safety arrangement for attachment to a work platform structure consisting of a plurality of spaced apart trestle configurations and overlying interconnecting decking boards defining a platform plane raised from the ground by supporting legs, comprises at least one upright member associated individually with, and adapted to be attached to, an associated supporting leg, the or each upright member comprising a lower section, dimensioned to stand alongside a said supporting leg, and an upper section dimensioned to extend beyond the decking plane of the platform to at least a height required of a guard rail for the platform structure, said lower section having a foot operable to support the upright member on the ground surface adjacent the supporting leg and having spaced apart along its length at least two stand-off members each configured to effect coupling of the lower section to a said supporting leg, and the upper section comprising at least one guard rail mounting feature, the lower section standoff members each being arranged to maintain a substantially fixed distance between the lower section and supporting leg laterally and to permit some relative movement longitudinally, and at least upper section rail mounting
  • a work platform structure platform structure comprises a plurality of spaced apart trestle configurations and overlying interconnecting decking boards defining a platform plane raised from the ground by supporting legs, and a safety arrangement as defined in the preceding paragraph wherein associated with at least one trestle configuration there is a said upright member comprising a lower section standing alongside a said supporting leg, and an upper section extending beyond the decking plane of the platform to at least a height required of a guard rail for the platform structure, said lower section having a foot operable to support the upright member on the ground surface adjacent the supporting leg and having spaced apart along its length at least two stand-off members each configured to effect coupling of the lower section to a said supporting leg and the upper section comprising at least one rail mounting feature, the lower section stand-off members each being arranged to maintain a substantially fixed distance between the lower section and supporting leg laterally and to permit some relative movement longitudinally, and at least one upper section guard rail mounting feature supporting a guard rail offset with respect to the lower
  • a safety arrangement for attachment to a work platform structure consisting of a plurality of spaced apart trestle configurations and overlying interconnecting decking boards defining a platform plane raised from the ground by supporting legs, comprises at least one upright member associated individually with, and adapted to be attached to, an associated supporting leg, the or each upright member comprising a lower section, dimensioned to stand alongside a said supporting leg, and an upper section dimensioned to extend beyond the decking plane of the platform to at least a height required of a guard rail for the platform structure, said lower section having a foot operable to support the upright member on the ground surface adjacent the supporting leg and having spaced apart along its length at least two stand-off members each configured to effect coupling of the lower section to a said supporting leg, and the upper section comprising at least one guard rail mounting feature, the lower section standoff members each being arranged to maintain a substantially fixed distance between the lower section and supporting leg laterally, and at least one upper section guard rail mounting feature being arranged to support
  • the coupling may, as defined in the last paragraph but three, have the lower section stand-off members each being arranged to permit some relative movement longitudinally between the lower section and supporting leg, and at least upper section rail mounting feature being arranged to support in use a rail offset with respect to the lower section in the direction of the stand-off members the centre of gravity of the upright member, when supported upright by the foot, being displaced from the upright member lower portion and, when coupled to a said associated supporting leg, operable to bias the upright member to lean towards the trestle configuration and effect frictional interference locking in respect of relative movement between the upright member and the support leg of the trestle configuration.
  • the upper section of the upright member is separable from the lower section, facilitating storage and transport of the latter folded with respect to the trestle.
  • the lower section of the upright member has a length that defines its operational height that is less than the height of the trestle.
  • the length of the lower section of the upright member may be chosen to conform with the working height of the trestle such that the dimensions of the upper section is common to all trestle heights configurable for the arrangement.
  • a work platform structure consisting of a plurality of spaced apart trestle configurations and overlying interconnecting decking boards defining a platform plane raised from the ground by supporting legs there is provided a safety arrangement as defined in the four preceding paragraphs wherein associated with at least one trestle configuration there is a said upright member comprising a lower section standing alongside a said supporting leg, and an upper section extending beyond the decking plane of the platform to at least a height required of a guard rail for the platform structure, said lower section having a foot operable to support the upright member on the ground surface adjacent the supporting leg and having spaced apart along its length at least two stand-off members each configured to effect coupling of the lower section to a said supporting leg, and the upper section comprising at least one guard rail mounting feature, the lower section stand-off members being arranged to maintain a substantially fixed distance between the upright member and supporting leg, the upright member being pivotable from an operational position outboard of the trestle to a more inboard position substantially in
  • a method of improving the safety of a work platform structure consisting of a plurality of spaced apart trestle configurations and overlying interconnecting decking boards defining a platform plane raised from the ground by supporting legs, comprises coupling to at least one spaced apart pair of trestle configuration supporting legs a corresponding pair of upright members each having a lower portion supported on the ground laterally spaced from its associated supporting leg and an upper portion extending above the platform, and joining the upper portions by way of one or more guard rails, the method further comprising coupling each of the lower portions to its associated and spaced supporting leg to permit substantially only longitudinal movement between them, disposing the centre of gravity of the upright members offset towards the platform and causing frictional locking between the upright members and supporting legs.
  • Figure 1 is a perspective view of a first embodiment of a work platform structure comprising traditional trestles and interconnecting decking boards incorporating a safety arrangement in accordance with the present invention, comprising singular upright members and guard rail mounting features accessible from outboard of the platform, and an optional ladder support,
  • Figure 2 is an end view of the work platform structure of Figure 1 in the direction 2 - 2 showing the disposition of the guard rail mounting features in relation to the platform,
  • Figure 3 is an end view of a second embodiment of work platform structure in accordance with the invention in which one or more of the guard rail mounting features are disposed overlying the platform,
  • Figure 4 is a perspective view of a third embodiment of a work platform structure in accordance with the present invention employing upright members generally similar to Figure 1 but being of two-part, telescopically extensible form.
  • Figure 5 is a perspective view of a fourth embodiment of work platform structure in accordance with the present invention, showing a multi-dimensional, ladder-like upright member and guard rail mounting features accessible from inboard of the platform, and optional horizontal supplementary bracing means between upright members,
  • Figure 6 is a perspective view, partly cut away, of a fifth embodiment of a work platform structure in accordance with the present invention, comprising upright members having separable upper and lower sections telescopically connected and deployed outboard of each associated trestle in use, but that can be folded inboard to the plane of the trestle when not in use,
  • Figure 7 is an end view of the work platform structure of Figure 6 in the direction 7-7 showing the disposition of the guard rail mounting features of the upper section of the upright member in relation to the platform,
  • Figure 8(a) shows a variant construction of guard rail mounting feature
  • Figure 8(b) is a perspective view of a coupling piece for supporting guard rails at platform corners and junctions
  • Figure 8(a) is a perspective view of a security gate arrangement for the platform and safety arrangement of Figure 6,
  • Figures 9(b) and 9(c) are plan views of the gate of Figure 9(a) in closed and opened orientations respectively.
  • Figure 10(a) is a perspective view of an alternative form of security gate arrangement for the platform of Figure 7,
  • Figures 10(b) and 10(c) are plan views of the gate of Figure 10(a) in closed and opened orientations respectively.
  • Figure 11 is a front view of a further form of security gate arrangement
  • Figure 12 is a front view of a modified form of the security gate arrangement of Figure 11
  • Figure 13 is a perspective view of a platform decking support frame shown partially in Figure 7,
  • Figure 14 is a perspective view of an access ladder suitable for locating on the support frame of figure 7, and
  • Figure 15 is an end view, similar to Figure 8, of a further form of platform structure having a safety arrangement, formed by a one-dimensional upright member pivotable about its associated trestle leg.
  • a work platform structure 10 comprises a plurality of trestles 12 l5 12 2 , 12 3 12 spaced spread apart in a linear array and overlying them and interconnecting them, a plurality of decking boards 14 ⁇ , 14 2 .
  • the decking boards are here shown as elongate planks whose lengths greatly exceed their widths W, but they may instead comprise boards each having the width of the platform.
  • the decking boards are located in a platform plane, indicated at 15, raised from the ground by the trestles to a height H pre-determined for the work required.
  • the trestles 12 ⁇ , 12 2 are substantially identical and only frestle 12 ⁇ will be described in detail.
  • the frestle 12 x comprises a pair of supporting legs 20 ⁇ A and 20 ⁇ B , spaced apart by bracing bars 22 x and upstanding with respect to feet 24j A and 24 ⁇ B respectively.
  • Each of the supporting legs is fixed at its upper end to a cross beam which at its ends overhangs slightly outboard of the legs and terminates in upstanding lugs 28 IA and 28 ⁇ B between which to receive and retain the decking boards 14 ⁇ etc.
  • the trestle 12 is essentially a two-dimensional structure, apart from the feet 24 1A and 24 1B which are braced to permit the trestle to stand upright and, in an array of similarly disposed trestles, give longitudinal stability to the platform as a whole. Sideways platform stability is provided by virtue of the limited overhang whereby the centre of gravity of the platform itself acts between the leg pair of the (and each) trestle.
  • the supporting legs 20 1A and 20 1B may be of fixed length, to provide a platform of fixed height, or in the embodiment shown here, may be extendable.
  • Each supporting leg, such as leg 20 1A comprises two, lower and upper, components 20 IA and 20 1AU respectively.
  • the lower component 20I AL comprises a tube fixed to, and extending from the foot 24 1A and the upper component 20 ⁇ AU comprises a tube, or bar, fixed to and extending from the cross beam 26 ⁇ and into the end of the tubular component 20 1AL .
  • the supporting leg 20 1B is likewise formed of two components 20 IBL and
  • the telescopic arrangement of supporting legs permits the cross beam 26 ⁇ to be raised and lowered with respect to the feet and retained at a predetermined height by means of cross-drillings in the leg components and retaining pins 29 ⁇ A and 29 1B which may be conveniently mounted on a horizontal bracing bar for sliding transversely to the supporting legs. It will be appreciated that by removal of the retaining pins the leg components may be separated and the beam removed for storage or replaced by one having longer leg components.
  • the safety arrangement is separate or separable from, and designed to be used with, the above described work platform structure 10.
  • the safety arrangement 30 comprises one or more upright members, indicated generically as 32j.
  • Each upright member such as 32j associated with trestle 12 ⁇ , is formed from singular bar or tube of steel and comprises a lower section 32 JL dimensional to stand alongside the trestle supporting leg 20 1A and an upper section 32 ⁇ dimensional to extend beyond the decking plane 15 of the platform to at least a height required of a guard rail for the platform structure.
  • the lower section 32 JL has a foot part 34 ⁇ , operable to support the member upright on the ground surface near the supporting leg 20 ⁇ A , spaced therefrom by virtue of two (or optionally more) standoff members 36 1L and 36ru.
  • Each of the stand off members 36 ⁇ L and 36 ⁇ is fixed rigidly, for example by welding, to the lower portion 32 !L and extends laterally thereof in a direction that is, when the upright member is alongside the trestle, towards the supporting leg 20 ⁇ A and to which it is coupled by a collar-like coupling piece 38 IL and 38 ⁇ u respectively.
  • Each coupling piece collar surrounds the leg so as to be a sliding fit, that is, arranged to maintain a substantially fixed distance between the lower section 32 IL of the upright member and the supporting leg laterally of the leg but to permit some relative movement longitudinally of the leg.
  • the lower coupling piece, 38 1Lj takes the form of a split collar that is formed from separable parts assembled around the leg and held together by screw 39 ⁇ or the like.
  • the upper coupling piece 38 ⁇ L may be of similar construction, preferably it comprises, as shown, a collar fixed to the end of the stand off member that cannot be removed from the telescopically assembled legs.
  • Such a collar may be assembled in situ about the leg by securing component parts to each other irremovably, such as by welding or with a shear head fastener, or by using a prefabricated collar to slide over the end of a component of the supporting leg 20 iA of the frestle in its disassembled state before the leg components are assembled telescopically and the cross-beam configured.
  • the leg 20 ⁇ A comprises telescopically mounted components (20 1A u and 20 1 ⁇ 1 ,) one of which has a smaller cross section than the other to slide therein.
  • the upper stand off member 36 ⁇ u is mounted at such a height as to be aligned with one supporting leg component or the other and coupling piece collar 38 ⁇ u is dimensioned accordingly.
  • the upright member 32j is disposed standing off from the trestle by a substantially fixed distance but each of them find their own level by virtue of their independent feet and the longitudinally (vertically) sliding ability of the coupling pieces 38 iL and 38 ro and supporting leg 20 1A .
  • the upper section of the upright member is arranged to provide mounting features for one or more guard rails running along the platform in the direction of the trestle array, that is orthogonally to the longitudinal, upright direction of the members and in practice running between and supported by a pair of adjacent upright members 32 ⁇ and 32 2 etc.
  • guard rails at three heights which in relation to the work platform (plane) are a toe rail or toe board disposed at the level of the platform to prevent materials or tools lying on the platform from being pushed over the edge, a mid-level rail and a high-level rail each spaced from the platform (plane) to prevent users or any large items from falling from the platform.
  • the relationship between the mid-level and high-level rails may be chosen to ensure that the position of each is disposed to perform a guarding function over a range of heights.
  • the toe rail which should not be raised clear of the platform surface when the platform is at its lowest or extend insufficiently above the level of the platform when it is at its highest.
  • the upper section 32 of the upright member 32 ! includes a crank 42 t which offsets it, with respect to most of the lower section, in the direction of the stand off members 36 and 36 1L , that is in the direction towards the associated frestle.
  • Each mounting feature comprises a channel, such as 46 2, open towards the top of the upright member between side walls 47 2A and 47 2B and, one of which (47 2B ) comprises the upper section 32 ⁇ u and the other of which is separated therefrom by a bight region.
  • Said other side wall 47 B comprises a stub upright 48 2 of fixed or adjustable length and the bight region comprises a transversely extending branch 49 2 of the upright member which displaces the stub upright, and thus forms the guard rail mounting channel disposed at the side of the upper section in the direction facing away from the platform in use, but between the lower section and platform.
  • Figure 1 shows in position only an upper guard rail 50 and Figure 2 shows only a lower or toe guard rail 52.
  • Each guard rail per se is elongate in the direction of the platform (trestle configuration array) and arranged to be mounted by disposing it in corresponding mounting feature channels of a pair of spaced apart upright members, such that it is supported by each.
  • each guard rail is provided by a plank having standardised dimensions and as used for the decking boards 14 ⁇ etc of the platform. Typical dimensions are a length of 30O cm, width of 200 cm and thickness of between 32 and 38 cm between opposite faces.
  • Each guard rail mounting channel is arranged to receive such a guard rail plank mounted on its edge and, insofar as each upright member may be shared between two adjacent pairs of upright members, the channel is of such width as to hold at least two overlapping rail planks face to face. Because of the nature of each guard rail plank and orientation within the channel, the guard rails are adequately retained by their weight, but if desired, a manually adjustable clamp 54 may be provided to effectively vary the width of the channel to grip and locate firmly any number of planks within the channel in a vice-like manner. It will be appreciated that other mechanisms may be provided for effectively varying channel width, such as varying the length of the transversely extending branch defining the bight region or the position of the stub upright along it.
  • guard rail mounting features and in use the guard rails themselves, are offset with respect to the lower section of the upright member in a direction towards the platform of the structure.
  • Such disposition of the guard rail mounting features, and in use the guard rails, offset with respect to lower section of the (and each) upright member displaces the centre of gravity of the each upright member 32 ! etc inboard, towards the associated trestle configuration such that with the upright member coupled to the supporting leg of the frestle configuration, the off-balance weight of the upright member (and guard rails) biases the upright member to lean towards the frestle configuration and effect frictional interference locking between the enjoyingwhile longitudinally slideable coupling pieces and the supporting leg.
  • each upright member having assumed an independently supported position on the ground adjacent the platform structure, in use is braced by the structure against significant displacement and each upright member effectively forms a buttress against displacement or toppling of the platform structure.
  • the mid-level and high-level guard rails may overlie the platform, insofar as such overlying may inhibit maximum use of the platform, but the position of a low level toe board or rail is important when the platform may be varied in height.
  • the lowest of the mounting features 44 ⁇ is disposed with respect to the upright member lower section, the stand off members and the platform overhang of the associated trestle configuration such that the lower guard rail 52, being a decking plank of significant width, is disposed to extend above the lowest intended working height of the platform.
  • this lowest mounting feature channel may be made particularly deep or adjustable in depth by virtue of the stub upright as shown ghosted at 48' ⁇ , so as to hold at least two rails stacked on top of each other in an upward direction if there is any requirement to raise the effective level of the toe guard rail.
  • guard rail mounting feature channels As indicated above (in respect of Figure 1), offsetting the guard rail mounting feature channels with respect to the lower section towards the platform effectively offsets the centre of gravity of the upright member, both with and without the guard rails present. By having the upper section cranked and offset, this gives access to the channel for receiving the elongate rails from outboard of the platform.
  • the guard rails can be installed and removed from one or more ladders placed against the edge of the platform rather than firstly being loaded onto the platform.
  • the safety arrangement 30 optionally comprises at an upper section of at least one upright member 32 3 a ladder rest bar 60 extending laterally from the member in a direction substantially opposite to the direction of the stand off members, that is away from the platform, and including restraining means indicated generally at 62, to secure the ladder with respect of the bar.
  • An upwardly extending projection 64 is operable to inhibit a ladder (shown ghosted at 66), resting on the bar, from sliding to the end of the bar and a manually operable tie means, such as a latch, an overlying clamp or loopable rope or chain 66 may be provided for preventing inadvertent lifting of the ladder from the rest bar.
  • a ladder shown ghosted at 66
  • a manually operable tie means such as a latch, an overlying clamp or loopable rope or chain 66 may be provided for preventing inadvertent lifting of the ladder from the rest bar.
  • a work platform structure of fixed height is shown at 10' in the end view of Figure 3, wherein the frestle configurations such as 12 ⁇ have supporting legs 20' ⁇ A and 20' 1B that are not extensible.
  • a second embodiment of safety arrangement 30' has the coupled upright member or members 32' ⁇ etc that stand off such that the mounting features 44' ! etc overlie, or hold the guard rails overlying, the platform.
  • the mid-level and high level guard rail mounting features may dispose the respective guard rails overlying the platform.
  • FIG. 4 An alternative approach, not dependant upon platform height, is shown in Figure 4 in a third embodiment of work platform structure and safety arrangement also according to the present invention.
  • the platform structure 110 corresponds to 10 described above.
  • the safety arrangement 130 comprises at least one upright member 132j.
  • the upright member differs from the upright member 32 ⁇ described above in that the lower section 132 1 comprises two telescopically adjustable parts 132 ILA and 132 ILB retainable with respect to each other by a locking pin or through-bolt arrangement 133 ⁇ such that the upper section 132 ⁇ u of the upright member can be disposed at an optimum height next to a work platform defined in height by the supporting legs of the associated trestle configuration.
  • the lower stand-off member 136 1 is fixed to the lower part 132 1LB of the lower section and coupled to the lower part of the supporting leg.
  • the upper stand-off member 136 ⁇ u is fixed to the upper part 132 1LA of the lower section and coupled to the upper part of the frestle supporting leg, so that the height of the upper section of the upright member 132m can be varied in accordance with the height defined for the trestle.
  • the stability that comes from having separately standing frestle supporting legs and upright members and the frictional locking of the displaceable coupling pieces may be achieved other than by having the coupling pieces fixed with respect to the stand off members and the stand off members fixed with respect to the lower section of the upright member.
  • one or each of the stand-off members may be fixed with respect to the associated supporting leg of the frestle configuration and the coupling piece formed as a collar slidable longitudinally with respect to the lower section of the upright member.
  • one or each stand-off member may be made longitudinally slideable with respect to both the lower section of the upright member and the supporting leg and respond to the leaning tendency of the upright member to effect the above described frictional locking with both.
  • the upright member shown in Figure 1 as a singular bar or tube, may comprise a number of such bars or tubes interconnected in a two- or three-dimensional lattice for even greater rigidity.
  • FIG 5 shows a fourth embodiment of work platform structure 210 in which an array of trestle configurations 12 ⁇ etc. and decking boards 14! etc. is substantially as shown at 10 in Figure 1 and numbered accordingly.
  • Safety arrangement 230 therefor comprises one or more upright members 232 ⁇ etc each associated with a trestle configuration, coupled to a supporting leg thereof.
  • the upright member 232 ⁇ comprises a lower section 232 ⁇ L terminating in a foot 234 ⁇ and, as an upward continuation, an upper section 232 .
  • the upright member for both of its sections, is formed as a two-dimensional lattice or ladder-section, comprising a pair of parallel bars or tubes interconnected by cross pieces 233 1 .
  • the lower section has affixed thereto two spaced apart standoff members 23 ⁇ L and 236 ⁇ u coupled to the associated upstanding supporting leg 20 ⁇ A for longitudinal (vertical) motion as described above.
  • the upper section 232 ⁇ u has guard rail mounting features 244 244 2 and 244 3 in the form of channels, 246 l5 246 2 and 246 3> each formed by a transverse bight region and stub upright but displaced from the upper section in the same direction as the stand off members, towards inboard of the platform.
  • the guard rail mounting channels are arranged to receive longitudinally overlapping guard rails formed by decking planks disposed on their side edges, but in this configuration placed into, or removed from, the channels from the platform.
  • the two-dimensional structure of the upright member 232 ⁇ gives more rigidity and less inclination to bend then a single rod or tube but otherwise behaves similarly insofar as it is arranged for the centre of gravity to be offset from acting centrally through it foot and encouraging frictional locking between the coupling pieces of the stand-off members and the associated trestle configuration supporting legs.
  • One or more braces may be employed between any pair of upright members and each brace may be adjustable in length if required.
  • a work platform 410 including a fifth embodiment of safety arrangement 430, combining features from the platform/safety arrangements 10V30', 110/130 and 210/230 described above.
  • the work platform structure 410 comprises a plurality of trestles 12' ⁇ , 12' 2 , 12' 3 12' > as described in relation to Figure 3, spa ced spread apart in a linear array and overlying them and interconnecting them plurality of decking boards 14 1; 14 2 located in a platform plane, indicated at 15, raised from the ground by the trestles to a height pre-determined for the work required.
  • the trestles 12' l5 12' 2 are substantially identical and only frestle 12' ⁇ will be described in any detail.
  • the trestle 12' ⁇ is furthermore substantially the same as frestle 12 ⁇ described above in comprising a pair of supporting legs 20' 1A and 20' ⁇ B , spaced apart by bracing bars 22j and upstanding with respect to feet 24 1A and 24 1B respectively, that include foot braces 24' 1A and 24'j B
  • Each of the supporting legs is fixed at its upper end to a cross beam 26 ⁇ which at its ends overhangs slightly outboard of the legs, terminating in upstanding lugs 28 ⁇ A and 28 1B between which to receive and retain the decking boards 14 ⁇ etc.
  • the supporting legs 20' ⁇ A and 20' ⁇ B are of fixed length, to provide a platform of fixed height; a fixed height trestle may be formed from a previously variable height frestle such as 12 ⁇ by welding together the telescopic leg components at their junction, or by welding the retaining pins 29 JA and 29 ⁇ B described therewith.
  • the safety arrangement 430 comprises one or more upright members, 432j.
  • Each functional upright member, such as 432 ! associated with frestle 12' 1 comprises a lower section 432 1 , dimensioned to stand alongside the frestle supporting leg 20 1A , and an upper section 432 ⁇ u, dimensioned to extend upwardly beyond the decking plane 15 of the platform to at least a height required of a guard rail for the platform structure.
  • the lower section 432 iL is formed by a two-dimensional array or lattice of spaced apart bars or tubes 432 ILA and 432 UB of steel or other structural metal, interconnected by cross pieces 433 1
  • the upper section is formed by an analogous array of bars or tubes 432 ⁇ A and 432 1TJB .
  • the upper and lower sections are separable but capable of being affixed to each other for use, although in variants thereof the upper and lower sections 243 ru and 432 1L may be integral with each other or otherwise fixed in relation to each other as shown in the above described embodiments.
  • Either one or both sections may be formed of tubes to receive the tubes or bars of the other section coaxially therein or alongside and retain them by transverse locking-pins, through-bolts or the like 433' 1A and 433' ⁇ B .
  • any section part may be a hollow tube or a solid bar, or even of open angle section, it is convenient to refer to these elongate structural elements of the upright member sections as "tubes" to help distinguish from other components of the platform arrangement.
  • they may take any convenient form in cross-section that provides strength and permits coupling.
  • the lower section 432 JL has a foot part 434 1 ⁇ operable to support the member upright on the ground surface.
  • the two-dimensional array of the lower section contracts to a single tube 432 1LA near the foot part, and preferably, but not essentially, the foot part is movable relative to the upright member, conveniently by a screw-thread 434V hi particular, the foot part 434 ⁇ is operable to support the member upright near the trestle supporting leg 20' ⁇ A , spaced therefrom by virtue of two (or optionally more) stand-off members 436 1L and 436 ro .
  • Each of the stand off members 436 1L and 436 ⁇ is fixed rigidly, for example by welding, to the lower portion 432 IL and extends laterally thereof in a direction that is, when the upright member is alongside the trestle, towards the supporting leg 20' 1A and to which it is coupled by a collar-like coupling piece 438 IL and 438 ⁇ _ respectively.
  • Each coupling piece collar surrounds the leg so as to be a sliding fit, that is, ananged to maintain a substantially fixed distance between the lower section 432 1L of the upright member and the supporting leg laterally of the leg but to permit some relative movement longitudinally of the leg.
  • the lower coupling piece, 438 ⁇ L may takes the form of a split collar that is formed from separable parts assembled around the leg and closed by permanent means, such as welding or shear-head screws.
  • the upper coupling piece 438 ⁇ L may be of similar construction or, if the supporting leg comprises separate components, the upper coupling piece may comprise a circumferentially complete collar that is fixed to the end of the stand off member and dimensioned to slide over the end of a component of the supporting leg 20' ⁇ A of the trestle in its disassembled state before the leg components are assembled telescopically and the cross-beam configured.
  • the particular benefit obtained by having at least one coupling piece formed as a permanently closed collar is that, when the work platform structure is fully assembled and ready for use, or in use, it is not thereafter possible to simply remove the upright member and compromise the safety of the arrangement.
  • the lower portion of upright member is disposed outboard of the frestle and standing off therefrom by a substantially fixed distance but each of them find their own level by virtue of then- independent feet and the longitudinal (vertical) sliding ability of the coupling pieces 438 !L and 438 ⁇ u relative to supporting leg 20 ⁇ A .
  • the upper section 432 m of the upright member is arranged to provide mounting features, indicated generally at 444, for one or more guard rails running along the platform lengthways in the direction of the frestle array, that is orthogonally to the upright, longitudinal direction of the members, and in practice running horizontally between, and supported by, a pair of adjacent upright members 432 ⁇ and 432 3 etc.
  • the upper section 432 J of the upright member 432 ⁇ forms three guard rail mounting features, 444 ⁇ , 444i 2 , and 444 ⁇ 3 , cantilevered in the direction of the stand off members 436ru and 436 ⁇ L , that is in the direction towards the associated trestle so as to overlie the edge of the platform.
  • These mounting features correspond to the mounting features 244 ! . 2441 and 244 3 of figure 2 and will not be described again in detail.
  • the guard rail mounting features, and in use, the guard rails are thus offset with respect to the lower section of the (and each) upright member so as not only to overlie the edge of the platform decking but also to displace the cenfre of gravity of the each upright member 432 ⁇ etc inboard, towards the associated trestle configuration, such that when the upright member is coupled to the supporting leg of the trestle configuration, the off-balance weight of the upright member (and guard rails) biases the upright member to lean towards the frestle configuration and effect frictional interference locking between the Vietnamesewhile longitudinally slideable coupling pieces and the trestle supporting leg, being braced by the frestle structure against significant displacement and effectively forming a buttress for the platform structure against displacement or toppling.
  • trestles 12' ⁇ , 12' 2 etc. defines a platform of fixed height
  • different sets of trestles are able to define platforms of different heights to work at.
  • the upright members may in general be required to be associated with platforms of different height, whether using fixed height or variable height trestles
  • the upper section of any upright member insofar as it defines guard rail positions relative to the platform deck plane, is required to provide guard rail mounting features independently of frestle height. Therefore in this embodiment the separable upper and lower sections of the upright member are formed with the lower section tailored to the height of the associated frestle and upper section of fixed length (height) and common to all lengths of lower section / frestle height.
  • the trestle is not adjustable in height
  • the lower section of the upright member made with a longitudinal extent (height) slight less than the minimum height of the frestle and have means to vary the mounting position of the upper section so as to be able to dispose the mounting features of the upper section correctly above the platform.
  • the guard rails could inadvertently be disposed incorrectly.
  • each of the coupling pieces 438 u, etc permits movement of the upright members longitudinally with respect to the associated trestle supporting leg (that is, in a vertical direction), whereby the upright member may be positioned vertically in coreect disposition with respect to the platform plane 15 and in operation effect frictional locking of the loaded upright member with respect to the associated trestle and vice versa for mutual stability, in this embodiment each of the coupling pieces 438 u, etc.
  • trestle and upright members are essentially two-dimensional, to lie against the trestle in a parked state for storing or transporting.
  • this parking function is of practical significance for any form of upright member, including one in which the upper and lower sections are inseparable as in the earlier described embodiments, it is of particular advantage where, as in this embodiment, the upper and lower member sections are separable and the lower section has a longitudinal extent (height) less than the trestle so as to fold to, and be retained in, the parked position with no significant increase in its overall dimensions of the trestle.
  • a frestle such as 12' 2 may form part of a platform that does not require an upright member to be associated with each frestle.
  • the existence of the upright member lower section 432 2 ⁇ . being carried by leg 20' 2A of the frestle 12' 2 does not prevent its use as a normal frestle insofar as decking can still be laid over the cross beam of the frestle.
  • the lower section of the upright member 432 ⁇ is a two-dimensional lattice of parallel tubes that are fixed in spaced-apart relationship to each other by at least one cross piece 433 ls the cross pieces of adjacent upright members, that is, 433 ⁇ of member 432 1L and 433 3 of member 433 iL , may provide anchorages for a supplementary brace extending between the adjacent upright members, such as shown at 470 offset from the members.
  • the brace may be similar to the brace 270 and adjustable in length.
  • the ends of the supplementary brace may hook on to the cross pieces or the upright member cross pieces may each carry a receptor 472 ⁇ , 472 3 respectively that engages the ends of the supplementary brace.
  • Each such receptor may take the form of an upwardly projecting peg to engage with a loop, hook or hole at the end of the brace, or a hole to engage a peg at the end of the brace.
  • the above-mentioned brace receptor peg 472j, 472 2 etc may project upwardly from its lower section cross piece 433 433 2 , beyond the ends of the tubes of lower section as shown by dotted line in Figure 7 at 472' ⁇ , whereby with the lower section in the folded inboard position the peg extends beyond the level of the trestle cross beam and prevents laying of decking, but when the lower section is deployed outboard of the trestle supporting leg the peg does not interfere with the decking, and may be employed to assist in locating the upper section of the upright member with respect to the lower section.
  • supplementary brace 470 By locating such supplementary brace 470 between deployed lower sections of upright members, lengthways stabilisation between adjacent trestles may be effected before the upper sections of the upright members are installed, and furthermore removal of the bracing beams from the assembled platform prevented.
  • guard rail mounting features 44 - 444 have been described as channels 46 - 446 defined by extensions and protrusions to an upright member formed of one or more bars or rods, such channels being of a similar bar-like or skeletal nature in order to accommodate guard rails that are substantial decking planks and longitudinally overlapping.
  • An alternative mounting feature is shown at 484 in Figure 8(a) wherein a guard rail mounting channel 486 is defined by laterally extensive walls 485, such a walled channel being able to offer greater support to less robust guard rails and/or permit adjoining rails to be accommodated in end-to-end relationship rather than overlapping.
  • such a channel arrangement may permit a safety arrangement to be more easily formed with only a single upright member, where a guard rail, extending longitudinally of the platform structure and transversely of the upright member may be essentially centred and balanced into longitudinal disposition in a single mounting channel with or without the assistance of a lateral vice-like clamp 487.
  • the above described channel may be provided of closed tubular form to receive and completely encircle one or more guard rails.
  • a trestle-based platform as described above may be required to change its lengthways direction to form a corner or T-junction with another platform, and that at each such change in direction it may be impracticable to provide upright members outboard of closely adjacent trestles.
  • a guard rail coupling piece 490 having limbs 492, 494 and optionally 496, dimensioned to fit within a mounting feature channel 46 - 446 or 486 of an upright member and be held therein by clamping by clamp 54 - 454 or 487 of the channel.
  • the limbs 492 etc may be made hollow to receive an end region of a guard rail therein and/or dimensioned such that a limb is received within an hollow end region of a guard rail and possibly retained therein by associated clamps indicated at 497.
  • the guard rail arrangement may take a form other than is provided by individual, essentially one-dimensional rail boards or planks spaced apart vertically as described above and/or be made of different materials.
  • the guard rail arrangement could alternatively comprise a two-dimensional panel, typically of mesh, that is located with respect to one or more mounting features in place of, or in addition to, a one dimensional rail. If there is the above-mentioned lengthways supplementary bracing between upright members that removes the need for the guard rails to fulfil such role, such a panel guard rail may be simply hooked on to one or more guard rail mounting features.
  • any upper section of any upright member may provide a mounting part for a security gate arrangement that permits material to be loaded onto or removed from the platform.
  • FIG. 9(a) to 9(c) a portion of platform structure 510 and safety arrangement 530 is shown.
  • the platform is the same as 410 and the safety arrangement is generally similar to arrangement 430 except for a modified upright member upper section that is shown at 532u, comprising tubular legs 532 UA and 532 UB which mount coaxially with respect to those of a lower section (not shown).
  • the upper section 532u of the upright member comprises an upright pivot post 580 disposed to overlie the platform decking slightly inboard of the platform edge.
  • a security gate 582 in the form of a panel 584 has a central pivot axis 586 substantially in or adjacent to the plane of the panel, whereby the sunounding halves 584 A and 584 B of the panel behave as wings comparable to a butterfly valve arrangement.
  • the panel areangement is mounted on the upright pivot post 580 for rotation thereabout, with one gate wing each side of the post. In the gate- closed position shown in Figure 9(a) both wings act as guard rail panels for the platform edge.
  • a third panel-like wing 584 c extending perpendicularly to the other two and extending in the plane of the upright member 532 ⁇ j.
  • Figure 9(b) represents the gate-closed position of Figure 9(a) and it can be seen that access along the platform is unlimited, including access to a loading or supply area 10 at the end of the platform, but that at the platform edges access or egress is prevented by the gate. If the gate is pivoted through 90 degrees anticlockwise to the position shown in Figure 9(c), the gate wing 584 B moves preventing access along the platform to the loading area, the wing 584 c moves to form a guard rail to the edge of the platform and the wing 584 A moves away from the platform to give access to the loading area 10 L from the edge of the platform for loading etc.
  • the loading area is again protected from the edge of the platform as the loading area is again opened up to the remainder of the platform.
  • the wings 584 A and 584 B that form a guard rail to the platform edge may be interconnected by a link piece (shown ghosted at 585) that ensures that during gate operation the edge of the platform is always guarded.
  • an upright pivot post 680 may be provided on an upper section 632 V of upright member of the form shown in Figures 6 and 7 which is able to support (at least to one side of the section) a conventional guard rail 50.
  • a security gate arrangement 682 comprises a panel 684 mounted on pivot post 680 for rotation thereabout, the panel comprising wings 684 A and 684 B extending either side of the position of the rotation axis. Referring to Figures 10(b) and 10(c), which are schematic plan views, the gate 682 has only two wings defined on opposite sides of the pivot. Figures 10(a) and 10(b) show the gate in a gate-closed position.
  • any of the above-described gates are defined by the upper section of an upright member
  • such member may be of any of the above-described configurations, that is, having the upper section an integral extension of the lower section and/or the upright member being of a one-dimensional, single tubular form rather than a lattice.
  • pivotal security gate forms described above depend upon the availability and locations of the upright members to support them, it is possible to provide analogous gating by way of an opening in a panel form of guard rail.
  • FIG. 11 An alternative arrangement for providing gating is shown in Figures 11 and 12.
  • a lengthways extending upper guard rail 750 has hung therefrom at least one panel 784, such as of mesh, so as to be slideable along the rail.
  • one or more further panels 784' may be provided side by side and at least the panel 784 is mounted by tabs 788 hooked onto the guard rail so that relative movement between the panels in a lengthways, horizontal direction causes the panel 784 (or 784') to ride over its neighbour to form an open gate.
  • adjacent tabs 788' of adjacent gate panels 784 and 784' may be crossed over, whereby the tabs of one run between the tabs of its neighbour without having to ride over the adjacent panel tab and the slideable mounting tabs may be formed as loops more secure and less easily removed than hooks.
  • a security gate arrangement of the foregoing description and protected loading area may be may be provided for any work platform other than by a trestle based platform arrangement as described above.
  • it may be provided by a more robustly constructed tower scaffold placed adjacent the end of a trestle-based platform arrangement that is nevertheless accessible from the platform, essentially as an extension thereof that requires protection for platform workers.
  • a work platform constructed from spaced-apart trestles, insofar as it is constructed in accordance with conventional practices regarding decking by laying boards 14 ⁇ , 14 2 , etc fherealong, is known to have the potential to harm workers thereon by so-called trip hazards at junctions or interfaces between decking boards intermediate the supporting trestle cross beams, when an end region of one board deflects under the weight of a worker but an adjacent board does not.
  • a support frame 800 to extend between each pair of adjacent trestles, such as 12' 2 and 12' 3 and be supported on the cross beams 26 2 and 26 3 thereof, as shown in Figure 7.
  • the support frame is, in plan view, of a generally H-shape and comprises two (but there can be more or fewer) lengthways extending members 810 A and 810 B which at their ends overlie the cross beams of the adjacent trestles.
  • the support frame comprises members conveniently made of open angle section but may be of tubular from, it being important only to keep the overall height added to the trestles to a minimum so as not to interfere with laying decking, and the ends of the members 810 A and 810 B hook onto the cross beams of the spaced apart trestles without adding significantly to the height of each trestle.
  • transverse frame members 820 A and 820 B spaced apart in the lengthways direction; the transverse frame members are conveniently, but not necessarily, orthogonal to the lengthways members.
  • transverse frame members not only are overlying decking boards prevented from deflecting under load between trestles but also the adjacent trestles are braced lengthways with respect to each other to improve the stability of the platform lengthways.
  • the anti-trip hazard feature may be employed with any trestle-based platform separately of the stabilisation provided by the upright members and guard rails described above.
  • any lengthways extending member of the frame 800 is capable of offering a rigid support to any apparatus bearing against the side of the platform.
  • a ladder or staircase arrangement such as shown at 830 in Figure 14, may be deployed supported by a lengthways frame member such as 810 A prior to laying the decking boards to provide platform access from the side of the platform.
  • a staircase arrangement or may be supported by the cross beam of an end trestle to provide platform end access.
  • Such a ladder or staircase would be particularly suited to an end region of a platform with which a security gate arrangement as described above is employed.
  • the staircase arrangement 830 comprises a support part 831 arranged to be supported by the platform structure, conveniently hooked onto it to be suspended therefrom, and a fread part 832 extending away from the support part, said tread part having an upper tread part 832 U5 fixed with respect to the support part and comprising a plurality of treads 833ui disposed spaced apart in fixed relationship with each other and the support part to define a vertical drop for the upper fread part from the support part no greater than the minimum platform height h ⁇ N , and a lower tread part 832 L arranged to extend optionally from the upper tread part as a continuation thereof and provide one or more further treads 833 L i for the staircase and define thereby in accordance with the separation between treads a staircase height corresponding to at least one of a number of platform heights up to a maximum height h MAX .
  • the lower tread part 832 L is arranged to extend telescopically with respect to the upper tread part, And comprises a further staircase of treads 833 L ⁇ . 833 L2; 833 ⁇ , ..., at least the uppermost one 833 L1 of which is adapted to overlie a fread 833 , 833 U2 , 833 U3 , • • •, of the upper fread part so as to define the effective staircase length.
  • Clearly other lower part treads 833L2 and 833L3 may overlie treads of the upper part in the extension is small.
  • At least one lower part tread is arranged to be located with respect to a fread of the upper part, for example by fread hooks 833' Li so that by varying which tread of the upper part is overlaid by the uppermost tread of the lower part, the staircase can extend down from the platform to reach ground level irrespective of platform height. Notwithstanding any ground unevenness relative to the platform supports that defines a local variation in platform height at the foot of the staircase, the staircase provides substantially uniformly spaced treads and eliminates any misalignment at the platform edge that could cause a trip hazard at height
  • Such a staircase arrangement is particularly suited to a platform of the type described above having a platform plane raised from the ground by supporting legs at one of a predetermined number of heights; that is, by setting the fread separations such that one or more separations correspond to each of said predetermined platform heights, a single staircase can be employed with all platform configurations.
  • a safety arrangement 930 comprises a one-dimensional upright member 932 separated into upper and lower sections 932u and 932 L .
  • the upright member is supported with respect to the frestle 12' by stand off members and pivotable coupling pieces as described above that permit it to be rotated to an inboard parked position, shown by broken lines 932' L -
  • the lowest part of the upright member is conveniently, but not essentially, cranked outwardly away from the frestle leg for greater stability and efficiency in utilising offsetting of its cenfre of gravity and providing clearance of trestle foot bracing during pivoting with respect to its storage position.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Ladders (AREA)

Abstract

Un dispositif de sécurité (30, fig. 1; 430, fig. 6) pour structure de plate-forme de travail (10; 410) composée par exemple de ponts sur chevalets (12; 12') et recouvrant des plateaux de tablier (14), comporte des contre-rails (50) qui surmontent la plate-forme pour prévenir la chute des utilisateurs et des objets de la plate-forme sans compromettre sa stabilité. Ce dispositif, qui comprend un ou plusieurs éléments verticaux (321, 322; 4321, 4322) dressés séparément sur le sol à proximité d'un pied de support (201A; 20'1A) d'une configuration de ponts sur chevalets (121;12'1, 12'2) associée, présente une partie inférieure (321L; 4321L, 4322L) couplée au pied de support et une partie supérieure (321U) qui s'étend au-dessus du niveau de la plate-forme et qui est munie de caractéristiques de montage de contre-rails (441, 442; 444). Des éléments d'écartement (361U, 361L) s'étendent de la partie inférieure (321L) au pied de support (201A) au moyen de bagues longitudinalement mobiles (381L, 381U), tout en permettant à l'élément vertical de bénéficier d'un soutien individuel sur le sol à distance fixe de la plate-forme pour empêcher l'encrassement. Les caractéristiques de montage des contre-rails, qui sont décalées vers la plate-forme, se présentent sous la forme de canaux qui reçoivent des madriers de plate-forme tels que les contre-rails. Le centre de gravité de l'élément vertical est décalé vers la plate-forme, ce qui a tendance à incliner l'élément vertical et à provoquer un blocage de frottement avec les ponts sur chevalets au moyen des pièces de couplage, la plate-forme portant l'élément vertical lequel agit comme contrefort de stabilisation pour la plate-forme. L'élément vertical (4321,4322) peut être porté par rapport à un pied de support associé (20'2A) de manière à pivoter autour du pied et à se replier à plat sur les ponts sur chevalets (12'2), à l'intérieur de l'enveloppe des ponts sur chevalets, en cas de non utilisation. Ce genre de pliage est particulièrement efficace lorsque l'élément vertical présente des parties supérieure et inférieure séparées et que la partie inférieure et plus courte que les ponts sur chevalets associés.
PCT/GB2004/005277 2003-12-24 2004-12-16 Structure de plate-forme de travail et dispositif de securite associe WO2005061816A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0329845.2 2003-12-24
GB0329845A GB2409491B (en) 2003-12-24 2003-12-24 Work platform structure and safety arrangement therefor
GB0406538A GB0406538D0 (en) 2004-03-24 2004-03-24 Work platform structure and safety arrangement therefor
GB0406538.9 2004-03-24

Publications (1)

Publication Number Publication Date
WO2005061816A1 true WO2005061816A1 (fr) 2005-07-07

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101922230B (zh) * 2009-06-12 2012-01-11 柏凯工程有限公司 鹰架护栏
CN114215325A (zh) * 2022-01-15 2022-03-22 福建省川工建设工程有限公司 一种装配式钢结构支架

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364733A (en) 2000-05-12 2002-02-06 David Michael Kelk Improvements in and relating to builders trestles
GB2378978A (en) 2002-07-03 2003-02-26 Pyramid Builders Ltd Builder's trestle system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364733A (en) 2000-05-12 2002-02-06 David Michael Kelk Improvements in and relating to builders trestles
GB2378978A (en) 2002-07-03 2003-02-26 Pyramid Builders Ltd Builder's trestle system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101922230B (zh) * 2009-06-12 2012-01-11 柏凯工程有限公司 鹰架护栏
CN114215325A (zh) * 2022-01-15 2022-03-22 福建省川工建设工程有限公司 一种装配式钢结构支架

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