EP0368653A1 - Rails pour règles à béton - Google Patents

Rails pour règles à béton Download PDF

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Publication number
EP0368653A1
EP0368653A1 EP89311591A EP89311591A EP0368653A1 EP 0368653 A1 EP0368653 A1 EP 0368653A1 EP 89311591 A EP89311591 A EP 89311591A EP 89311591 A EP89311591 A EP 89311591A EP 0368653 A1 EP0368653 A1 EP 0368653A1
Authority
EP
European Patent Office
Prior art keywords
concrete
rail
rail according
concrete screed
reinforcement
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Withdrawn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
EP89311591A
Other languages
German (de)
English (en)
Inventor
Roy Alan Clifton
Terry John Stoner
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.)
Cliffstone Products Ltd C/o Lucraft hodgson & Dawes
Original Assignee
Cliffstone Products Ltd C/o Lucraft hodgson & Dawes
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 Cliffstone Products Ltd C/o Lucraft hodgson & Dawes filed Critical Cliffstone Products Ltd C/o Lucraft hodgson & Dawes
Publication of EP0368653A1 publication Critical patent/EP0368653A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C9/00—Special pavings; Pavings for special parts of roads or airfields
    • E01C9/002—Coverings, the surface of which consists partly of prefabricated units and partly of sections made in situ
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • 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
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/10—Devices for levelling, e.g. templates or boards
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B2005/322—Floor structures wholly cast in situ with or without form units or reinforcements with permanent forms for the floor edges
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B2005/324—Floor structures wholly cast in situ with or without form units or reinforcements with peripheral anchors or supports

Definitions

  • This invention relates to concrete screed rails, which are increasingly being accepted by the construction industry in place of traditional shuttering or formwork to assist in the placing of in situ concrete slabs and screeds.
  • Wooden formwork suffers from the disadvantage that it has to be sawn to size and assembled by carpenters on site, and then struck (i.e. stripped out) after a concrete pour has partly cured. It is therefore time consuming to use, and hence expensive. Furthermore, it can normally be used only once, and then becomes scrap.
  • concrete screed rails are formed of the same material as the finished slab, and can therefore be left in position to form part of the slab. They also ensure that top quality concrete is provided at a slab edge, and when left in situ, they ensure a good bond with the adjacent concrete pour. Furthermore, they are easy to use, especially with reinforcement rods, and save up to 50% in time compared with timber formwork.
  • Another known concrete screed rail has preformed apertures in its web, and areas of reduced thickness concrete called knock-outs, which can be removed by knocking away the concrete with a hammer; again, too much concrete is usually removed, which causes leakage of poured concrete.
  • a concrete screed rail having at least substantially parallel spaced top and bottom edges with a web portion between said edges, at least the upper edge being provided with a finished surface, and wherein a reinforcement of short fibres is provided within the concrete of the rail, there being at least one recess in the web portion, with a thin layer of fibre reinforced concrete extending across said recess.
  • a plurality of recesses are provided, across each of which a thin layer of fibre reinforced concrete extends.
  • the thin layer of concrete reinforced with fibres extending across each recess is supported by the reinforcement, but can be knocked out as required to allow transverse reinforcement bars to extend through the recesses.
  • the screed rail may be in the form of a straight beam of I-section, or alternatively of generally L-shaped cross-section. Beams of L-shaped section are particularly suited to provide a border or edge regions of the slab.
  • each of the screed rails has a finished top edge 1, and in spaced, generally parallel relationship thereto, a bottom edge 3. Located between the top and bottom edge regions is a web portion 5. Since the screed rails are specifically designed to remain in situ in the poured concrete slab, the top edge 1 is finished smooth, and will be co-planar with the top surface of the slab.
  • each section is defined by longitudinal screed rails and transverse stop ends.
  • Central sections could be defined by a selection of any of the illustrated rails, but normally the same rails would be used.
  • the boundary edge of the section would normally be defined by one of the rails shown in Figures 4 and 5, with the flange 7 turned inwardly.
  • the rails To use the rails, they are first placed in situ, and supported at the correct level on a few dabs of concrete, care being taken to ensure that the top edge 1 is set at the desired finished level of the slab. At the same time as the rails are being set in position, reinforcement bars, such as bars 9 and 11 shown in Figure 3, are also placed in position as will hereinafter be explained. Then, the concrete can be poured into a rectangular space defined by the rails, and can be tamped or vibrated as necessary, using the aligned top edges of the rails as a levelling guide.
  • reinforcement bars such as bars 9 and 11 shown in Figure 3
  • the rail shown therein is of inverted T-shaped cross-section, with an enlarged bottom flange 15, and a plurality of recesses 17 are provided in the web portion 5, spaced apart by portions of the web which are approximately of the same width as the top edge region of the rail.
  • the whole rail is reinforced throughout its length by a plurality of short fibres. These may be formed of polypropylene and may be about 12mm long, and mixed in with the other constituents of the concrete.
  • Two suitable mixes of fibres are those sold as DOLANIT by Hoechst Chemicals and FIBREMESH by Fibremesh Limited of Chesterfield, and a suitable concrete mix is made up as follows:- One part by weight ordinary Portland cement From .002 to .02 parts by weight fibres One part by weight sand Two parts by weight aggregate .5 part by weight water plus the usual additives (water disperser, hardener, plasticiser).
  • Additional reinforcement bars or the like may be incorporated in the rail, such as the bars 21 and 23 shown in the embodiment of Figures 4 and 5.
  • the rail shown in Figure 3 is a symmetrical rail with identical top and bottom edge regions, and provided both the top edge 1 and the bottom edge 3 are given a smooth finish, it can be used either way up.
  • This rail is provided with cast in reinforcement restraining bars 13, but in place of these, apertures may be provided in the web portions between recesses 17.
  • the screed rail shown in Figures 4 and 5 is specifically designed as an edge rail, and has an L-shaped cross-section. L-shaped reinforcement bars 23 extend through each web portion 5.
  • the recesses are totally masked or "curtained” with a thin layer or membrane 19 of fibre reinforced concrete. This ensures no escape of "fat”, e.g. concrete fines, from the poured slab when it is being tamped or vibrated. Obviously, this is important in the edge rail shown in Figures 4 and 5, since it ensures a smooth edge finish to the concrete slab.
  • the fibre reinforced concrete membrane(s) 19 is/are sufficiently thin not to impede the placing of the reinforcement rods. They are simply pushed through it.
  • reinforcement rods 9, 13 can be "threaded” in position to unite different pours, the membraned recess(es) offering a wide choice of location for each rod 9 and helping also to support it.
  • the present invention provides pre-cast concrete screed rails which are designed to improve the placing of in situ concrete slabbing and associated reinforcement.
  • the rails are designed to become an integrated part of the whole slab, and give improved edge finish to a completed floor.
  • the rails may be of any desired length, e.g. 3 metres, and in various heights.
  • the rail has recesses 17 at 300mm centres covering the significant face area of the web form, to allow the free passage of reinforcement, dowels and conduit of varying sizes, but still retain the fresh concrete during pouring or placing.
  • the concrete membrane filled recesses also allow full bond area to any connecting reinforcement passing through. This eliminates problems associated with bars passing through holes as in known concrete screed rails where full compaction is not achieved around the holes, thus weakening the finished product. Freedom of design is available to the engineer to place all reinforcement and services passing through concrete joints at their required position.
  • the use of the rail provides superior concrete material at the edges of slabs, eliminating problems sometimes associated with poorly placed concrete in this area.
  • the rail would normally be constructed of 40MN/MM2 concrete, reinforced with X MM HT wire and with the fibre reinforcement located throughout the unit, thus providing crack control as well as performing its other function of supporting the concrete membranes 19 in the recesses 17.
  • the rail When shimmed to level and secured in line by dabs of wet concrete, the rail will provide a secure form for tamping and screeding in both longitudinal and transverse joints or finished edges, giving the contractor complete control over the work without having to puncture any sub-surface membrane.
  • the largest rail would normally weigh approximately 30Kg making it easy for one operator to fix.
  • the savings in time in setting up and stripping out are approximately 50%, thus speeding the work on the whole project.
  • rails such as those shown in Figures 4 and 5 can be used back to back with expansion jointing material incorporated between them. This ensures that these joints are properly constructed and that both edges are sound.
  • a further advantage of the screed rails of the present invention is that, because of the recesses, they require about 20% less concrete for their manufacture than known concrete screed rails. This means they are easier to use. Also, there tends to be less grout loss than occurs with traditional stop-end shuttering.
  • the rails are used as screed rails.
  • a superior edge finish is obtained, which is particularly advantageous where high wheel loadings can be expected on slab edges and joints.
  • the rails can be used to form construction, isolation, slab edge, expansion or contraction joints.
  • the rails also provide a comprehensive jointing for concrete slabs.
  • a helically wound stainless steel rectangular bar having a cross-sectional dimension of approximately 7mm x 1mm and a helix pitch of about 15mm.
  • Such reinforcing bars are manufactured by Helix Reinforcements Limited and do not rust. Because the fibres are incorporated in the concrete mix, impact resistance is increased in the screed rails. It is also preferred that sharp corners are rounded off on the screed rail and a radiused edge be provided to the underside of the top edge portion to allow the release of entrapped air in the recesses during manufacture of the screed rails.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
EP89311591A 1988-11-09 1989-11-09 Rails pour règles à béton Withdrawn EP0368653A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888826206A GB8826206D0 (en) 1988-11-09 1988-11-09 Concrete screed rails
GB8826206 1988-11-09

Publications (1)

Publication Number Publication Date
EP0368653A1 true EP0368653A1 (fr) 1990-05-16

Family

ID=10646555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89311591A Withdrawn EP0368653A1 (fr) 1988-11-09 1989-11-09 Rails pour règles à béton

Country Status (2)

Country Link
EP (1) EP0368653A1 (fr)
GB (1) GB8826206D0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154558A1 (es) * 1998-09-08 2001-04-01 Sanchez Jaime Enrique Jimenez Metodo de fabricacion de viga de borde o de canto, del tipo jaula de ferralla con suela de hormigon y viga semiprefabricada asi obtenida.
EP1422355A1 (fr) * 2002-11-21 2004-05-26 Ankaba AG Plaque de coffrage et coffrage et procédés de fabrication et d'installation relatifs
EP1600569A2 (fr) * 2004-04-06 2005-11-30 Schöck Bauteile GmbH Elément de construction pour isolation thermique
EP1947255A3 (fr) * 2007-01-17 2013-07-03 Pino Albanese Armature pour plaques de décoffrage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480259A (en) * 1936-08-18 1938-02-18 George Francis Xavier Hartigan Improvements in concrete road-construction
EP0124532A1 (fr) * 1982-06-15 1984-11-14 Tremix Ab Agencement pour la pose de plancher.
EP0168205A2 (fr) * 1984-07-04 1986-01-15 Square Grip Limited Rail de guidage pour règles à béton
EP0289261A2 (fr) * 1987-04-27 1988-11-02 CLIFFSTONE PRODUCTS LIMITED C/O LUCRAFT,HODGSON & DAWES Rails pour règles à béton

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480259A (en) * 1936-08-18 1938-02-18 George Francis Xavier Hartigan Improvements in concrete road-construction
EP0124532A1 (fr) * 1982-06-15 1984-11-14 Tremix Ab Agencement pour la pose de plancher.
EP0168205A2 (fr) * 1984-07-04 1986-01-15 Square Grip Limited Rail de guidage pour règles à béton
EP0289261A2 (fr) * 1987-04-27 1988-11-02 CLIFFSTONE PRODUCTS LIMITED C/O LUCRAFT,HODGSON & DAWES Rails pour règles à béton

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154558A1 (es) * 1998-09-08 2001-04-01 Sanchez Jaime Enrique Jimenez Metodo de fabricacion de viga de borde o de canto, del tipo jaula de ferralla con suela de hormigon y viga semiprefabricada asi obtenida.
EP1422355A1 (fr) * 2002-11-21 2004-05-26 Ankaba AG Plaque de coffrage et coffrage et procédés de fabrication et d'installation relatifs
EP1600569A2 (fr) * 2004-04-06 2005-11-30 Schöck Bauteile GmbH Elément de construction pour isolation thermique
EP1600569A3 (fr) * 2004-04-06 2006-03-22 Schöck Bauteile GmbH Elément de construction pour isolation thermique
EP1947255A3 (fr) * 2007-01-17 2013-07-03 Pino Albanese Armature pour plaques de décoffrage

Also Published As

Publication number Publication date
GB8826206D0 (en) 1988-12-14

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