WO1986002969A1 - Dalles pour faux planchers - Google Patents

Dalles pour faux planchers Download PDF

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Publication number
WO1986002969A1
WO1986002969A1 PCT/AU1985/000270 AU8500270W WO8602969A1 WO 1986002969 A1 WO1986002969 A1 WO 1986002969A1 AU 8500270 W AU8500270 W AU 8500270W WO 8602969 A1 WO8602969 A1 WO 8602969A1
Authority
WO
WIPO (PCT)
Prior art keywords
slab
tile
slabs
weakness
concrete
Prior art date
Application number
PCT/AU1985/000270
Other languages
English (en)
Inventor
William John Matthews
Original Assignee
William John Matthews
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 William John Matthews filed Critical William John Matthews
Publication of WO1986002969A1 publication Critical patent/WO1986002969A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/024—Sectional false floors, e.g. computer floors
    • E04F15/02405—Floor panels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F2203/00—Specially structured or shaped covering, lining or flooring elements not otherwise provided for
    • E04F2203/02—Specially structured or shaped covering, lining or flooring elements not otherwise provided for having particular shapes, other than square or rectangular, e.g. triangular, hexagonal, circular, irregular
    • E04F2203/023—Specially structured or shaped covering, lining or flooring elements not otherwise provided for having particular shapes, other than square or rectangular, e.g. triangular, hexagonal, circular, irregular having triangular shapes

Definitions

  • False floors are floors which are supported above a true floor or above a roof on pedestals.
  • a false floor may be constructed are:
  • false floors are constructed of rectangular slabs or tiles which are supported on packing blocks or column supports set under the four corners of each slab or tile.
  • these slabs or tiles are pre-cast reinforced concrete members or are pressed steel members filled with concrete or particle board.
  • Planar floors and uniform column supports are rare and either the slabs or tiles rock about the pivot provided by two of the supports, or each slab has to be supported on adjustable jacks at each corner or has to be carefully packed to ensure that it is supported evenly on all four supports.
  • Rocking slabs produce an unsatisfactory false floor. Careful jacking or packing at each support, however, adds considerably to the cost of the installation of the false floor.
  • This objective is achieved, according to a first aspect of the present invention, by the provision of a quadrilateral floor slab with a diagonal line of weakness built therein.
  • the application of pressure to the slab causes the slab to yield along the line of weakness until the slab becomes, effectively, two triangular slabs, joined along the line of weakness, with each triangular slab being supported at its three corners. If the slab is a pre-cast reinforced concrete slab, it will crack along the line of weakness.
  • the above-noted objective is also achieved, according to a second aspect of the present invention, by forming a rectangular slab as two triangular slabs, joined along a corresponding side by a hinge or by a flexible joint.
  • a slab for use in the construction of a false floor comprises a quadrilateral pre-cast slab of concrete or the like, characterised by the provision of a line of weakness in the slab, the line of weakness being located along a diagonal of the quadrilateral slab.
  • the line of weakness may be formed by the provision of a groove extending along a diagonal of the slab, or by any other suitable construction.
  • the quadrilateral shape will be a parallelogram.
  • the most useful shapes are the rectangle, square and rhombus.
  • a slab for use in the construction of a false floor comprises a pair of slabs, each slab having the shape of a triangle, said slabs being joined along a corresponding side by a flexible joint.
  • the flexible joint may comprise a hinge construction.
  • the triangular shape will be either an equilateral triangle (to produce a slab having a rhombus shape) or a right-angled triangle (to produce a slab of rectangular shape - including a square).
  • a panel formed as a plurality of slabs, each constructed in accordance with the first or second aspect of the present invention, is a useful realisation of the present invention.
  • Figure 1 is a perspective view of one embodiment of a floor slab constructed in accordance with the first aspect of the present invention.
  • Figure 2 is a sectional view at II-II of the floor slab of Figure 1.
  • Figure 3 shows, using a schematic sectional view at III-III of the slab of Figure 1, the mounting of the slab of Figure 1 on a planar floor, using support columns of equal height.
  • Figures 4 and 5 are similar drawings to Figure 3, illustrating the way in which the slab of Figure 1 yields when the floor above which it is mounted is not planar and/or the support columns are not of equal height.
  • Figure 6 is a perspective sketch of another embodiment of the first aspect of the present invention.
  • Figure 7 is a view (similar to that of Figure 2) of the slab of Figure 6.
  • Figure 8 is a perspective sketch of an embodiment of the second aspect of the present invention.
  • Figure 9 is a sectional view of the slab of Figure 8, taken at the diagonal of the slab which is transverse to the adjacent sides of the two triangular slabs which form the composite slab of Figure 8.
  • Figures 10, 11 and 12 illustrate panels which have been constructed as an assemblage of slabs having the features of the present invention.
  • Figures 13 and 14 are sectional views, partly schematic, in the direction X-X of Figure 10, showing alternative constructions of the panel of Figure 10. - 6 -
  • the floor slab 10 shown in Figures 1 and 2 is substantially square (a square being one example of a rectangle, which is a particular form of parallelogram, which is a preferred form of the quadrilateral shape of the present invention). It has a groove or slot 11 formed along one diagonal, which creates a line of weakness in the slab along this diagonal.
  • the slab 10 will be of pre-cast, reinforced concrete, and will be a square having sides of 500mm or 600mm and a thickness in the range from 20 to 40mm.
  • the reinforcing mesh 12 (see Figure 2) will normally be positioned about 2 or 3mm from the bottom surface of the slab and the groove 11 will extend from the upper surface of the slab to about 1mm above the top of the reinforcing material 12.
  • the groove 11 may be created by including a strip of particle board or similar material in the mould for the slab when the concrete is poured into the mould.
  • strength for the slab may be provided by a strong membrane attached (for example, by gluing) to the top of this particle board strip, instead of by reinforcement in the concrete.
  • the particle board remains in the groove or slot 11.
  • a convenient way of forming an open groove 11 is to stretch a tape, having a thickness of 1mm, across the mould for the slab after the reinforcing mesh has been positioned and before the concrete is poured. After the slab has been cast with the tape in this position, the tape can be removed, thus creating groove 11.
  • Another technique for forming the groove or slot 11 is to provide an extending thin flange or knife edge on the lower surface of the press that is used to compact the concrete in the mould for the slab (most slabs will be formed using a pressure compaction process). When the compaction of the slab is effected, the projecting flange or knife edge creates the groove or slot 11 in the slab.
  • the slab 10 shown in Figures 1 and 2 has two preferred, but optional, features. These are the
  • the chamfer at the corner of the slab is preferred to reduce the possibility of a weakness to abrasion at the acute angle formed by an edge of the slab and the contiguous inside face of the groove 11.
  • a square hole is formed at that point. (If the chamfer is not at right angles to the direction of slot 11, the hole at this point will have a non-square, polygon shape.)
  • This hole can be filled with a plug of resilient material (such as PVC, rubber or neoprene).
  • the plug used for this purpose has a cross-section which matches the shape of the hole, and has a slight taper so that it has to be tamped into position (to assist in securing the assembled slabs in their required locations). If the plug is longer than the thickness of the slab, the top of the plug can be cut off flush with the top of the assembled slabs. If the plug contains metal wires or is otherwise manufactured so that it conducts electricity, it can be used to remove unwanted static electricity from a carpet or other floor covering laid on top of the false floor formed by the assembled slabs. For this purpose, the plugs will have to contact earthed conductors on the top of the supporting columns for the assembled false floor.
  • the holes 14 in the sides of the slabs are provided to enable small resilient plugs, inserted into the holes, to form connections between the adjacent faces of assembled tiles (which also assists in securing the assembled slabs in their required positions).
  • the slab 10 is rigidly constructed, this deformation requires the slab to crack along its diagonal line of weakness, as shown at reference 17 in Figures 4 and 5. With such deformation or yielding of the slab, the width of the slot 11 will either increase (as shown in Figure 4) or decrease (see Figure 5). Thus, for most practical purposes, the slot or groove 11 should be at least 1mm in width.
  • the reinforcing material 12 used in pre-cast concrete slabs of this type has to be chosen with reference to (a) the thickness of the slab (which effectively becomes a tile when it is thin), (b) the location of the reinforcing material within the slab or tile, and (c) the load capacity of the slab or tile.
  • the selection of the type and location of the reinforcing material is an engineering exercise which persons of skill in this art can readily perform.
  • the reinforcing material may have to be weakened immediately below the diagonal slot or groove 11 in the slab or tile. This can be effected, when a wire mesh is used for reinforcing, by cutting through (or partially cutting through) at least some of the mesh wires that lie directly underneath the slot or groove 11.
  • a reinforcing mesh 12 in the slabs or tiles of the present invention it has been found to be advantageous to locate the mesh approximately 2 mm clear of the underside of the slab or tile.
  • tensional reinforcement could be located closer to the underside of the slab, then either the tension forces that oppose the flexing of the slab are increased, or a smaller gauge of reinforcing material may be used to provide a slab with the same torsional strength.
  • a reinforcing mesh with lugs on its uppermost side, able to be bonded into the concrete of the slab is preferred.
  • a mesh formed from flat wires which are twisted into the vertical plane between each cross-wire may be used.
  • Such special types of reinforcement mesh add to the cost of production of the slab or tile, and the additional cost of fabricating such special reinforcement mesh can be counterbalanced by ensuring that a conventional mesh is located at the correct height in the concrete.
  • the reinforcement of the slab or tile may be achieved by using a mesh or other structure fabricated from a polycarbonate or other strong plastics material, instead of the conventional steel mesh.
  • the slab or tile 60 is formed as a concrete block 61 which is bonded to the top of a tray 63 which forms the base of the slab or tile.
  • the tray may be a steel tray, or it may be formed from a polycarbonate material or from another strong plastics material.
  • the tray 63 may be deformed or have lugs projecting upwardly from it to key into the concrete block 61.
  • the diagonal line of weakness of the slab or tile 60 can be created by providing the groove or slot 62 in the cast material.
  • the tray 63 can be weakened along the line of a diagonal, or the tray 63 can be formed as two triangular metal dishes, bonded together by fabric (for example, reinforcing mesh) in the concrete block 61 (the groove or slot 62 may then become an optional feature, depending on the strength of the slab and the use to which it is to be put).
  • fabric for example, reinforcing mesh
  • the weakening of the tray along a diagonal may be achieved by cutting into the tray along the line of the diagonal, by forming a series of incisions in the tray along the line of the diagonal, by forming a series of holes along the line of the diagonal, or by deforming the tray to create an upwardly-extending ridge along the line of the diagonal.
  • Another way of constructing a slab in accordance with the first aspect of the present invention is to construct a shell of a plastics material in the required shape of the slab, and subsequently to inject lightweight concrete or other suitable material into the shell.
  • the line of weakness in the slab can be formed in the plastic shell in the same way as the line of weakness may be created in the tray 63 of the embodiment of Figure 6.
  • the shell may be constructed by spot welding an upper and a lower steel tray, to form the shape of the slab.
  • Yet another way of constructing a slab in accordance with the first aspect of the present invention is to cast a slab of lightweight concrete or other suitable material, then to mould a shell of a strong plastics material around all or part of the cast material.
  • the diagonal line of weakness can be created, in the moulded plastic coat, by any one of the techniques that may be used to weaken the tray 63 of the embodiment illustrated in Figure 6.
  • the embodiment of the second aspect of the present invention comprises a pair of right-angled triangular slabs or tiles 80 joined along their adjacent hypotenuses by a hinge or flexible joint 81.
  • the joint 81 may be of any flexible material - including metal - and may conveniently be incorporated into the slab or tile during the simultaneous casting of the blocks 80.
  • the joint 81 may be replaced by a suitable hinge construction.
  • the slab or tile has been square or substantially square.
  • other quadrilateral shapes including a rhombus, may be used for the slabs or tiles.
  • Some (or all) of the slabs or tiles used in a false floor may be provided with a small, covered opening, through which conduits and wiring may pass to the sub-floor space, and through which ther_e is an access to the cavity formed beneath the false floor.
  • a modification of the present invention is the production of a composite panel comprising an assemblage of slabs or tiles which are constructed in accordance with the present invention. Two examples of this modification are illustrated in, respectively, Figures 10 and 11.
  • Figure 10 consists of a panel for use in the construction of a false floor which comprises nine square slabs.
  • the panel is a square of side length 500mm or 600mm, and contains nine square slabs, each having a side dimension of about 200mm and a diagonal line of weakness 101.
  • the line of weakness may be established by any suitable technique described above.
  • each triangular section is provided with a single leg or support column at one of its corners, and solid dowel bonding is used to connect the corners of the triangle remote from the leg-carrying corner to the corresponding corners of the adjacent triangle.
  • a layer of floor covering material (for example, carpet, as shown at 106 in Figure 14) may be bonded to the top of individual slabs of the panel to act as a binding membrane for the slabs and to provide a flexible bonding between adjacent triangular sections.
  • An edge strip 105 is usually provided around the side of each composite panel.
  • Figure 12 shows how three rhombus-shaped slabs, constructed in accordance with the present invention, with each triangular portion 120 of a slab connected to its adjacent triangular portions by hinges 121, and with supports 122 at each corner of a triangular portion 120, form a composite hexagonal panel.
  • hexagonal panels when they are used to construct a false floor, portions of the floor can be removed to provide access to the sub-floor and the buttressing (that is, the lateral thrust) of the remaining panels ensures that these panels do not move sideways to close or reduce the opening to the sub-floor.
  • This "closing" phenomenum is often experienced with conventional false floor constructions, and is known as “creep” in computer floors. It will be appreciated that “creep” makes it difficult to replace floor panels, and can endanger the stability of a false floor.
  • a convenient method of constructing panels of the type illustrated in Figures 10, 11 and 12 is to mould the panels in one piece, using a rigid plastics material (or a metal).
  • the edges adjoining each rigid triangular portion are formed as thin strips of material by any suitable pressing technique. The thickness of each of these thin strips is such that it will flex and yet remain integrated with the triangular portions it connects.
  • the present invention is particularly suited for the construction of false floors over curved shapes such as domes, or over the surface formed by the intersection of inclined planes.
  • the joints between the assembled slabs will usually be filled with a jointing strip, mastick material, putty or the like.
  • a floor covering (such as carpet) may be laid on top of a false floor formed by an assembly of the slabs of the present invention.
  • the floor covering may be bonded to the false floor by adhesive, or by using mechanical clips (such as plastic plugs).

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Floor Finish (AREA)

Abstract

Des faux planchers sont construits avec des dalles ou des carreaux (10, 60) quadrilatéraux montés sur des colonnes ou des montants de support (15, 102). Chaque dalle ou carreau comprend une ligne diagonale d'affaiblissement qui permet au carreau de fléchir autour de cette ligne d'affaiblissement pour former deux parties triangualires assemblées. Il convient, bien que ce ne soit pas nécessaire, que les dalles ou carreaux soient construits comme des dalles en béton préfabriquées pourvues d'une fente (11, 62) qui forme la diagonale d'affaiblissement. L'invention porte également sur des panneaux, de préférence hexagonaux, formés par une pluralité de dalles ou de carreaux interconnectés ayant les caractéristiques de la présente invention.
PCT/AU1985/000270 1984-11-06 1985-11-06 Dalles pour faux planchers WO1986002969A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU799884 1984-11-06
AUPG7998 1984-11-06

Publications (1)

Publication Number Publication Date
WO1986002969A1 true WO1986002969A1 (fr) 1986-05-22

Family

ID=3698662

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1985/000270 WO1986002969A1 (fr) 1984-11-06 1985-11-06 Dalles pour faux planchers

Country Status (2)

Country Link
EP (1) EP0199797A1 (fr)
WO (1) WO1986002969A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599411A1 (fr) * 1986-05-30 1987-12-04 Kyodo Denki Panneau couvre-plancher concu pour le passage de cables
EP0506499A1 (fr) * 1991-03-26 1992-09-30 Fukuvi Chemical Industry Co., Ltd. Elément de panneaux pour être utilisé dans des faux planchers surélevés
DE3925779C2 (de) * 1988-08-05 1998-11-05 Om Kiki Kk Frei zugängliches Bodenpaneel
GB2370048A (en) * 1999-11-30 2002-06-19 Chen Yao Chung Elevated floor assembly having fire resistant properties
JP2004501299A (ja) * 2000-06-23 2004-01-15 ケンプ，　マイケル，　バリー 改良された建築／床張りパネル
WO2004092510A1 (fr) * 2003-04-17 2004-10-28 Evers, Marinus, Gerardus, Maria Element de renfort de toiture, combinaison d'un tel element avec un toit, et procede pour faire un tel element

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1263369A (fr) * 1960-04-27 1961-06-09 Plancher béton armé en dalles triangulaires
AU5976665A (en) * 1965-06-15 1966-12-15 Trigon Systems (Queensland) Pty. Ltd Building component, building unit and building structures composed of prestressed reinforced concrete
DE2711198A1 (de) * 1977-03-15 1978-09-21 Mengeringhausen Max Verfahren und formwerkzeug zur herstellung einer punktbelastbaren polygonfoermigen bauplatte, insbesondere doppelbodenplatte sowie kern zur verwendung bei der herstellung der bauplatte
GB2025504A (en) * 1978-07-18 1980-01-23 Soum R P Concrete floor slabs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1263369A (fr) * 1960-04-27 1961-06-09 Plancher béton armé en dalles triangulaires
AU5976665A (en) * 1965-06-15 1966-12-15 Trigon Systems (Queensland) Pty. Ltd Building component, building unit and building structures composed of prestressed reinforced concrete
DE2711198A1 (de) * 1977-03-15 1978-09-21 Mengeringhausen Max Verfahren und formwerkzeug zur herstellung einer punktbelastbaren polygonfoermigen bauplatte, insbesondere doppelbodenplatte sowie kern zur verwendung bei der herstellung der bauplatte
GB2025504A (en) * 1978-07-18 1980-01-23 Soum R P Concrete floor slabs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Planning and Design of Tall Buildings, Volume III, Structural Design of Tall Concrete and Masonry Buildings. (International) Conference Proceedings). American Society of Civil Engineers. August 21-26, 1972. see pages 805-810 and especially page 807 and figure 4. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599411A1 (fr) * 1986-05-30 1987-12-04 Kyodo Denki Panneau couvre-plancher concu pour le passage de cables
DE3925779C2 (de) * 1988-08-05 1998-11-05 Om Kiki Kk Frei zugängliches Bodenpaneel
EP0506499A1 (fr) * 1991-03-26 1992-09-30 Fukuvi Chemical Industry Co., Ltd. Elément de panneaux pour être utilisé dans des faux planchers surélevés
GB2370048A (en) * 1999-11-30 2002-06-19 Chen Yao Chung Elevated floor assembly having fire resistant properties
JP2004501299A (ja) * 2000-06-23 2004-01-15 ケンプ，　マイケル，　バリー 改良された建築／床張りパネル
EP1292742B1 (fr) * 2000-06-23 2009-06-10 Michael Barrie Kemp Panneau de construction, en particulier pour planchers, murs et plafonds, avec un treillis d'armature incorporé dans une dalle en béton et son procédé de fabrication
WO2004092510A1 (fr) * 2003-04-17 2004-10-28 Evers, Marinus, Gerardus, Maria Element de renfort de toiture, combinaison d'un tel element avec un toit, et procede pour faire un tel element

Also Published As

Publication number Publication date
EP0199797A1 (fr) 1986-11-05

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