EP1371792A1 - Formwork made of reinforced foamed material - Google Patents

Formwork made of reinforced foamed material Download PDF

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Publication number
EP1371792A1
EP1371792A1 EP03291385A EP03291385A EP1371792A1 EP 1371792 A1 EP1371792 A1 EP 1371792A1 EP 03291385 A EP03291385 A EP 03291385A EP 03291385 A EP03291385 A EP 03291385A EP 1371792 A1 EP1371792 A1 EP 1371792A1
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EP
European Patent Office
Prior art keywords
interjoist
sheet
adherent sheet
adherent
dihedrons
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.)
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Application number
EP03291385A
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German (de)
French (fr)
Inventor
Yves Ehrmann
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Knauf SAS
Original Assignee
Knauf SAS
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Publication date
Application filed by Knauf SAS filed Critical Knauf SAS
Publication of EP1371792A1 publication Critical patent/EP1371792A1/en
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    • 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
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E04B5/26—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated with filling members between the beams
    • E04B5/261—Monolithic filling members
    • E04B5/263—Monolithic filling members with a flat lower surface
    • 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
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E04B5/26—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated with filling members between the beams
    • E04B5/261—Monolithic filling members
    • E04B5/265—Monolithic filling members with one or more hollow cores
    • 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
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E04B5/26—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated with filling members between the beams
    • E04B5/266—Filling members covering the undersurface of the beams

Definitions

  • the invention relates to an interjoist comprising a body having a lower face and two opposite side faces are connecting to it according to projecting dihedrons, and two spoilers extending respectively along said faces lateral, projecting laterally beyond them, each having a lower face located higher than the underside of the body and connecting to the side face corresponding according to a re-entering dihedral, the body and spoilers being formed in one piece of plastic material alveolar.
  • Such interjoists are used in the building for the realization of floors, in cooperation with beams mutually parallel and equidistant horizontal lines.
  • the two spoilers of an interjoist respectively rest on two neighboring beams, so that the interjoist forms a bridge between the beams and help create a support continuous for pouring a concrete slab.
  • Such a glimpse also provides thermal insulation between levels upper and lower.
  • FR 2 606 323 A proposes to cover this edge and the surfaces edges of the dihedral of a flexible reinforcement tape member.
  • this measure has the effect to move the weak area of the interjoist, which is breaks from the underside of the body as a result of the bending caused by the force exerted on its upper face.
  • the risk of rupture is all the higher as the center distance beams is larger, a center distance of 600 to 700 mm being common today to improve thermal insulation by reducing the percentage of the floor area occupied by beams.
  • the object of the invention is to improve the resistance to break in between vis-à-vis a point load.
  • the invention relates in particular to an interjoist of the kind defined in introduction, and provides that at least the regions of the faces lower and side of the body adjacent to the edges said projecting dihedrons are covered with a sheet adherent tensile.
  • tensile strength is meant that the sheet has sufficient tensile strength to maintain the cohesion of the underlying material against of an elongation effort exerted parallel to the covered surface.
  • the adherent sheet is obtained for example by extrusion and has a tensile strength which differs according to the direction, it is advantageous to orient it so that this resistance is greater in the direction perpendicular to the edges of said dihedrons as in the direction parallel to them.
  • the adherent sheet can be smooth or structured. She can present patterns and / or colors giving it a decorative character.
  • Figures 1a and 1b are cross-sectional views of which each partially shows an interjoist and a beam on which rests a spoiler in between and a concrete slab poured over the whole to form a floor.
  • Figures 2 to 7 are perspective views of different embodiments of an interjoist according to the invention.
  • Figures 8 to 12 are diagrams showing the mode of rupture under load of different types of interjoists cellular plastic material.
  • Figure 1a partially shows an interjoist formed of a single piece 1 of expanded polystyrene defining a body central 2 having a lower face 3 which in the example illustrated is flat and horizontal, and a side face left 4 flat and vertical.
  • Part 1 can be molded or cut out of a block.
  • the side face 4 defines with the underside 3 a right projecting dihedral 5 whose edge is designated by the reference 6.
  • the molded part 1 defines also a left spoiler 7 projecting laterally relative to the face 4 and having a lower face 8, flat and horizontal, located higher than side 3 of the body.
  • the lower face 8 defines with the lateral face 4 of the body a right re-entering dihedral 9, the edge of which is designated by the reference 10.
  • the spoiler also has, opposite the body 2, a lateral face 11 which extends vertically upwards from the underside 8 and defines with it a right projecting dihedral 12.
  • Figure 1a is also shown a beam in prestressed concrete 16 comprising a body 17 and two heels 18 projecting from the body, respectively towards the left and to the right of the figure, while the body protrudes upward from the heels.
  • the spoiler 7 of the interjoist 1 rests on the right heel 18 of the beam.
  • a reinforced concrete compression slab 19 is poured on site on the interjoist and on the beam.
  • FIG. 1b shows the right side of a interjoist 1 similar to that of FIG. 1a, associated with a truss beam comprising a concrete footing 25 in which are embedded two longitudinal metal rods 26.
  • Another rod longitudinal metal 27 extends above the sole and is connected to the rods 26 by metallic wires 28 for form a waiting reinforcement, which is embedded in the slab 19 covering the interjoist and the sole.
  • Figure 8 shows schematically the left half of the profile of an interjoist like that illustrated in the figures 1a and 1b without reinforcement.
  • a breakout primer 20 occurs from the edge 10 of the dihedral 9 connecting this face to the face lateral 4 of the body.
  • Figure 9 is a view similar to Figure 8, relating to a interjoists according to FR 2 606 323 A, in which the faces 8 and 4 and the edge 10 are covered with a reinforcing strip 21. The rupture from edge 10 is thus avoided, but observes a rupture from the underside 3 of the body, as indicated by reference 22.
  • the invention provides for covering with a sheet of reinforcement at least the regions of the lower faces 3 and side 4 of the body adjacent to the edges 6.
  • Figures 2 to 7 illustrate various possible profiles of a interjoists according to the invention.
  • the reinforcement sheet 30 covers the entire underside 3 of the body 2, and part of each lateral face 4, from the corresponding edge 6, only the part of the sheet covering the side face 4 located to the right of the figures being visible.
  • figure 2 presents a classic profile similar to that of FIGS. 1a and 1b.
  • the figure 3 differs from the previous one in that the underside of the body is not flat, but hollowed out, and has a flat and horizontal middle part 31 and two side parts 32 flat and inclined, each forming a dihedral entering with part 31 and a sharp protruding dihedral with a lateral face 4 of the body.
  • Figure 4 differs from Figure 2 in that the body has a domed upper face 35 and a underside comprising a curved main part concave 36 leaving on either side of narrow horizontal flat parts 37 connecting to the faces lateral 4 by the right dihedral 9.
  • Figures 6 and 7 show interjoists comprising a molded part 1 of expanded polystyrene similar to that of Figure 2, provided as known per se with a tongue in the form an attached plate intended to come below a beam to improve the thermal performance of all.
  • the tongue 40 covers the whole of the underside 3 of the body, being glued on the reinforcement sheet 30, and protrudes with respect to one of the side faces 4.
  • the tongue 41 covers only part of the neighboring lower face 3 a side face 4, and protrudes in the same way at from the latter.
  • Figures 10 to 12 are diagrams similar to Figures 8 and 9, relating to interjoists according to the invention.
  • Figure 10 illustrates an interview similar to that of the figure 2.
  • the reinforcement sheet 30 is extended so as to cover the entire face lateral 4 of the body, the edge 10 of the re-entering dihedral 9 and the underside 8 of spoiler 7.
  • the reinforcement sheet also covers the all faces 4 and 8 and edges 6 and 10, and extends to further cover the dihedral edge protruding 12 and a portion, adjacent thereto, of the face lateral 11 of the spoiler 7.
  • the median region of the width of the underside 3 of the body is not covered, so that the backing sheet is formed of two separate elements symmetrical to each other with respect to in the median plane of symmetry of the interjoist.
  • Figures 3, 4 and 6 show the cells 38 passing longitudinally through the bodies of the interjoists. Such cells can be optionally provided for all shapes of you and may have various profiles.
  • the table below indicates, for interjoists as illustrated in FIGS. 8 to 12, produced from molded parts of expanded polystyrene of two different apparent densities, the resistance to the load represented by the force necessary for the rupture. , this force being exerted on the top of the body, either 15 cm from the vertical plane of the lateral face of a spoiler, or in the longitudinal plane of symmetry of the interjoist, the lower face 8 of each spoiler resting on a support , the most unfavorable support position being retained in each case.
  • interjoists according to the invention have a resistance at least equal to 150 daN, as required by the Technical Specifications, for a density of 15 kg / m 3 , this condition also being satisfied by an interjoist according to the Figure 11 with a density of 14.5 kg / m 3 .
  • a rupture initiation 20 occurs from the edge 10, as in the case of the unreinforced interjoist of FIG. 8, while that for the interjoist of FIGS. 1a, 1b and 2, a rupture initiation 23 occurs from the edge 24 of the reinforcement sheet 30 turned towards the plane of symmetry of the interjoist.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The filler (1), comprising a body (2) with an under-surface (3) and two side surfaces (4) with projections that rest on the projecting edges (18) of reinforced concrete joists (17), is made from a cellular plastic material with the under-surfaces of its outer edges covered with a layer of an adhesive sheet material that is resistant to traction. The filler (1), comprising a body (2) with an under-surface (3) and two side surfaces (4) with projections that rest on the projecting edges (18) of reinforced concrete joists (17), is made from a cellular plastic material with the under-surfaces of its outer edges covered with a layer of an adhesive sheet material that is resistant to traction. The sheet material, which is between 30 and 500 microcentimeters thick and has a weight of between 50 and 250 g/sq m, can cover the whole under-surface of the filler and is made from a polymer and/or kraft paper, or woven/non-woven synthetic or natural fibres or glass fibre mesh optionally impregnated with adhesive.

Description

L'invention concerne un entrevous comprenant un corps présentant une face inférieure et deux faces latérales opposées se raccordant à celle-ci selon des dièdres saillants, et deux becquets s'étendant respectivement le long desdites faces latérales, faisant saillie latéralement au-delà de celles-ci, présentant chacun une face inférieure située plus haut que la face inférieure du corps et se raccordant à la face latérale correspondante selon un dièdre rentrant, le corps et les becquets étant formés d'une seule pièce en matière plastique alvéolaire.The invention relates to an interjoist comprising a body having a lower face and two opposite side faces are connecting to it according to projecting dihedrons, and two spoilers extending respectively along said faces lateral, projecting laterally beyond them, each having a lower face located higher than the underside of the body and connecting to the side face corresponding according to a re-entering dihedral, the body and spoilers being formed in one piece of plastic material alveolar.

De tels entrevous sont utilisés dans le bâtiment pour la réalisation de planchers, en coopération avec des poutrelles horizontales mutuellement parallèles et équidistantes. Les deux becquets d'un entrevous reposent respectivement sur deux poutrelles voisines, de sorte que l'entrevou forme un pont entre les poutrelles et contribuent à réaliser un support continu pour la coulée d'une dalle en béton. Un tel entrevous assure également une isolation thermique entre les niveaux supérieur et inférieur.Such interjoists are used in the building for the realization of floors, in cooperation with beams mutually parallel and equidistant horizontal lines. The two spoilers of an interjoist respectively rest on two neighboring beams, so that the interjoist forms a bridge between the beams and help create a support continuous for pouring a concrete slab. Such a glimpse also provides thermal insulation between levels upper and lower.

Pour assurer la sécurité des personnes pendant la circulation sur les entrevous puis la mise en oeuvre du béton, le Cahier des Prescriptions Techniques "planchers" exige que les entrevous résistent à une charge ponctuelle minimale de 150 daN, mesurée selon la norme française P38-401.To ensure the safety of people during traffic on the interjoists then the implementation of the concrete, the Book of the "Floor" Technical Prescriptions requires that interjoists withstand a minimum point load of 150 daN, measured according to French standard P38-401.

On observe couramment, lors de l'essai selon cette norme, une rupture de l'entrevou à partir de l'arête du dièdre rentrant reliant le becquet au corps. Pour éviter ce phénomène, FR 2 606 323 A propose de recouvrir cette arête et les surfaces adjacentes du dièdre d'un ruban souple de renforcement adhérent. On constate cependant que cette mesure a pour effet de déplacer la zone de faiblesse de l'entrevous, lequel se rompt à partir de la face inférieure du corps par suite de la flexion provoquée par l'effort exercé sur sa face supérieure. Le risque de rupture est d'autant plus élevé que l'entre-axe des poutrelles est plus grand, un entre-axe de 600 à 700 mm étant courant aujourd'hui pour améliorer l'isolation thermique par la réduction du pourcentage de la surface du plancher occupée par les poutrelles.During the test according to this standard, a rupture of the interjoist from the edge of the re-entering dihedral connecting the spoiler to the body. To avoid this phenomenon, FR 2 606 323 A proposes to cover this edge and the surfaces edges of the dihedral of a flexible reinforcement tape member. We note, however, that this measure has the effect to move the weak area of the interjoist, which is breaks from the underside of the body as a result of the bending caused by the force exerted on its upper face. The risk of rupture is all the higher as the center distance beams is larger, a center distance of 600 to 700 mm being common today to improve thermal insulation by reducing the percentage of the floor area occupied by beams.

Le but de l'invention est d'améliorer la résistance à la rupture des entrevous vis-à-vis d'une charge ponctuelle.The object of the invention is to improve the resistance to break in between vis-à-vis a point load.

L'invention vise notamment un entrevous du genre défini en introduction, et prévoit qu'au moins les régions des faces inférieure et latérales du corps adjacentes aux arêtes desdits dièdres saillants sont recouvertes d'une feuille adhérente résistant à la traction.The invention relates in particular to an interjoist of the kind defined in introduction, and provides that at least the regions of the faces lower and side of the body adjacent to the edges said projecting dihedrons are covered with a sheet adherent tensile.

Par "résistant à la traction", on entend que la feuille présente une résistance à la traction suffisante pour maintenir la cohésion du matériau sous-jacent à l'encontre d'un effort d'allongement s'exerçant parallèlement à la surface recouverte.By "tensile strength" is meant that the sheet has sufficient tensile strength to maintain the cohesion of the underlying material against of an elongation effort exerted parallel to the covered surface.

Des caractéristiques optionnelles de l'invention, complémentaires ou de substitution, sont énoncées ci-après:

  • Ladite feuille adhérente recouvre la totalité de la face inférieure du corps.
  • Ladite feuille adhérente recouvre la totalité des faces latérales du corps et les régions des faces inférieures des becquets adjacentes aux arêtes desdits dièdres rentrants.
  • Ladite feuille adhérente recouvre la totalité des faces inférieures des becquets.
  • Les becquets présentent à l'opposé du corps des faces latérales se raccordant à leurs faces inférieures selon des dièdres saillants, et ladite feuille adhérente recouvre en outre les régions des faces latérales des becquet adjacentes à ces derniers dièdres saillants.
  • La feuille adhérente est une feuille de polystyrène choc.
  • La feuille adhérente a une épaisseur comprise entre 30 et 500 µm.
  • La feuille adhérente est une feuille de papier kraft ou une feuille composite comprenant au moins une couche de papier kraft, par exemple une feuille composite papier kraft-polyéthylène.
  • La feuille adhérente a une masse surfacique comprise entre 50 et 250 g/m2.
  • La feuille adhérente est une feuille de fibre textile naturelle ou synthétique non tissée.
  • La feuille adhérente est renforcé par un réseau de fibres tissées ou non tissées.
  • La feuille adhérente est un treillis de fibre de verre optionnellement imprégné de colle.
  • La feuille adhérente est liée au corps par collage, thermo-collage ou soudage.
  • La feuille adhérente présente une résistance à la traction au moins égale à 1 kg/mm2 dans la direction perpendiculaire aux arêtes desdits dièdres.
  • La région de la feuille adhérente recouvrant la face inférieure du corps est elle-même recouverte d'une languette sous forme d'une plaque rapportée qui fait saillie latéralement au-delà de l'une au moins des faces latérales du corps.
Optional, complementary or alternative characteristics of the invention are set out below:
  • Said adherent sheet covers the entire underside of the body.
  • Said adherent sheet covers all of the lateral faces of the body and the regions of the lower faces of the spoilers adjacent to the edges of said reentrant dihedrons.
  • Said adherent sheet covers all of the undersides of the spoilers.
  • The spoilers have, opposite the body, lateral faces which are connected to their lower faces according to protruding dihedrons, and said adherent sheet further covers the regions of the lateral faces of the spoilers adjacent to these latter protruding dihedrons.
  • The adherent sheet is an impact polystyrene sheet.
  • The adherent sheet has a thickness of between 30 and 500 μm.
  • The adherent sheet is a sheet of kraft paper or a composite sheet comprising at least one layer of kraft paper, for example a composite sheet of kraft-polyethylene paper.
  • The adherent sheet has a surface mass of between 50 and 250 g / m 2 .
  • The adherent sheet is a sheet of natural or synthetic non-woven textile fiber.
  • The adherent sheet is reinforced by a network of woven or non-woven fibers.
  • The adhering sheet is an optionally fiberglass mesh impregnated with glue.
  • The adherent sheet is bonded to the body by bonding, heat bonding or welding.
  • The adherent sheet has a tensile strength at least equal to 1 kg / mm 2 in the direction perpendicular to the edges of said dihedrons.
  • The region of the adherent sheet covering the underside of the body is itself covered with a tongue in the form of an attached plate which projects laterally beyond at least one of the side faces of the body.

Lorsque la feuille adhérente est obtenue par exemple par extrusion et présente une résistance à la traction qui diffère selon la direction, il est avantageux de l'orienter de telle sorte que cette résistance soit plus grande dans la direction perpendiculaire aux arêtes desdits dièdres que dans la direction parallèle à celles-ci.When the adherent sheet is obtained for example by extrusion and has a tensile strength which differs according to the direction, it is advantageous to orient it so that this resistance is greater in the direction perpendicular to the edges of said dihedrons as in the direction parallel to them.

La feuille adhérente peut être lisse ou structurée. Elle peut présenter des motifs et/ou des couleurs lui conférant un caractère décoratif.The adherent sheet can be smooth or structured. She can present patterns and / or colors giving it a decorative character.

Les caractéristiques et avantages de l'invention seront exposés plus en détail dans la description ci-après, en se référant aux dessins annexés.The characteristics and advantages of the invention will be described in more detail in the description below, in referring to the attached drawings.

Les figures 1a et 1b sont des vues en coupe transversale dont chacune montre partiellement un entrevous et une poutrelle sur laquelle s'appuie un becquet de l'entrevous ainsi qu'une dalle de béton coulée sur l'ensemble pour former un plancher.Figures 1a and 1b are cross-sectional views of which each partially shows an interjoist and a beam on which rests a spoiler in between and a concrete slab poured over the whole to form a floor.

Les figures 2 à 7 sont des vues en perspective de différents modes de réalisation d'un entrevous selon l'invention.Figures 2 to 7 are perspective views of different embodiments of an interjoist according to the invention.

Les figures 8 à 12 sont des schémas montrant le mode de rupture sous charge de différents types d'entrevous en matière plastique cellulaire.Figures 8 to 12 are diagrams showing the mode of rupture under load of different types of interjoists cellular plastic material.

La figure 1a montre partiellement un entrevous formé d'une pièce unique 1 en polystyrène expansé définissant un corps central 2 présentant une face inférieure 3 qui dans l'exemple illustré est plane et horizontale, et une face latérale gauche 4 plane et verticale. La pièce 1 peut être moulée ou découpée dans un bloc. La face latérale 4 définit avec la face inférieure 3 un dièdre saillant droit 5 dont l'arête est désignée par la référence 6. La pièce moulée 1 définit également un becquet gauche 7 faisant saillie latéralement par rapport à la face 4 et présentant une face inférieure 8, plane et horizontale, située plus haut que la face 3 du corps. La face inférieure 8 définit avec la face latérale 4 du corps un dièdre rentrant droit 9, dont l'arête est désignée par la référence 10. Le becquet présente en outre, à l'opposé du corps 2, une face latérale 11 qui s'étend verticalement vers le haut à partir de la face inférieure 8 et définit avec celle-ci un dièdre saillant droit 12.Figure 1a partially shows an interjoist formed of a single piece 1 of expanded polystyrene defining a body central 2 having a lower face 3 which in the example illustrated is flat and horizontal, and a side face left 4 flat and vertical. Part 1 can be molded or cut out of a block. The side face 4 defines with the underside 3 a right projecting dihedral 5 whose edge is designated by the reference 6. The molded part 1 defines also a left spoiler 7 projecting laterally relative to the face 4 and having a lower face 8, flat and horizontal, located higher than side 3 of the body. The lower face 8 defines with the lateral face 4 of the body a right re-entering dihedral 9, the edge of which is designated by the reference 10. The spoiler also has, opposite the body 2, a lateral face 11 which extends vertically upwards from the underside 8 and defines with it a right projecting dihedral 12.

Sur la figure 1a est également représentée une poutrelle en béton précontraint 16 comprenant un corps 17 et deux talons 18 faisant saillie par rapport au corps, respectivement vers la gauche et vers la droite de la figure, tandis que le corps fait saillie vers le haut par rapport aux talons. Le becquet 7 de l'entrevous 1 s'appuie sur le talon droit 18 de la poutrelle. Enfin, une dalle de compression en béton armé 19 est coulée sur chantier sur l'entrevous et sur la poutrelle.In Figure 1a is also shown a beam in prestressed concrete 16 comprising a body 17 and two heels 18 projecting from the body, respectively towards the left and to the right of the figure, while the body protrudes upward from the heels. The spoiler 7 of the interjoist 1 rests on the right heel 18 of the beam. Finally, a reinforced concrete compression slab 19 is poured on site on the interjoist and on the beam.

La figure 1b sur laquelle les mêmes signes de référence que sur la figure 1a sont utilisés pour désigner des éléments semblables, montre le côté droit d'un entrevous 1 analogue à celui de la figure 1a, associé à une poutrelle à treillis comprenant une semelle en béton 25 dans laquelle sont noyées deux tiges métalliques longitudinales 26. Une autre tige métallique longitudinale 27 s'étend au-dessus de la semelle et est reliée aux tiges 26 par des fils métalliques 28 pour former une armature en attente, qui est noyée dans la dalle 19 recouvrant l'entrevous et la semelle.Figure 1b on which the same reference signs as in figure 1a are used to designate elements similar, shows the right side of a interjoist 1 similar to that of FIG. 1a, associated with a truss beam comprising a concrete footing 25 in which are embedded two longitudinal metal rods 26. Another rod longitudinal metal 27 extends above the sole and is connected to the rods 26 by metallic wires 28 for form a waiting reinforcement, which is embedded in the slab 19 covering the interjoist and the sole.

La figure 8 représente schématiquement la moitié gauche du profil d'un entrevous tel que celui illustré sur les figures 1a et 1b dépourvu de renfort. Lorsqu'on exerce un effort sur le dessus du corps 2 de l'entrevous, alors que le becquet 7 repose sur une poutrelle non représentée par sa face inférieure 8, une amorce de rupture 20 se produit à partir de l'arête 10 du dièdre 9 raccordant cette face à la face latérale 4 du corps.Figure 8 shows schematically the left half of the profile of an interjoist like that illustrated in the figures 1a and 1b without reinforcement. When we exert an effort on the top of the body 2 of the interjoist, while the spoiler 7 rests on a beam not shown by its underside 8, a breakout primer 20 occurs from the edge 10 of the dihedral 9 connecting this face to the face lateral 4 of the body.

La figure 9 est une vue analogue à la figure 8, relative à un entrevous selon FR 2 606 323 A, dans lequel les faces 8 et 4 et l'arête 10 sont recouvertes d'une bande de renfort 21. La rupture à partir de l'arête 10 est ainsi évitée, mais on observe une rupture à partir de la face inférieure 3 du corps, comme indiqué par la référence 22. Figure 9 is a view similar to Figure 8, relating to a interjoists according to FR 2 606 323 A, in which the faces 8 and 4 and the edge 10 are covered with a reinforcing strip 21. The rupture from edge 10 is thus avoided, but observes a rupture from the underside 3 of the body, as indicated by reference 22.

Pour améliorer encore la résistance à la charge de l'entrevous, l'invention prévoit de recouvrir d'une feuille de renfort au moins les régions des faces inférieure 3 et latérales 4 du corps adjacentes aux arêtes 6.To further improve the load resistance of the interjoist, the invention provides for covering with a sheet of reinforcement at least the regions of the lower faces 3 and side 4 of the body adjacent to the edges 6.

Les figures 2 à 7 illustrent divers profils possibles d'un entrevous selon l'invention. Sur toutes ces figures, la feuille de renfort 30 couvre la totalité de la face inférieure 3 du corps 2, et une partie de chaque face latérale 4, à partir de l'arête 6 correspondante, seule la partie de la feuille recouvrant la face latérale 4 située à droite des figures étant visible.Figures 2 to 7 illustrate various possible profiles of a interjoists according to the invention. In all these figures, the reinforcement sheet 30 covers the entire underside 3 of the body 2, and part of each lateral face 4, from the corresponding edge 6, only the part of the sheet covering the side face 4 located to the right of the figures being visible.

L'entrevous de la figure 2 présente un profil classique semblable à celui des figures 1a et 1b.The interjoist of figure 2 presents a classic profile similar to that of FIGS. 1a and 1b.

L'entrevous de la figure 3 diffère du précédent en ce que la face inférieure du corps n'est pas plane, mais évidée, et présente une partie médiane 31 plane et horizontale et deux parties latérales 32 planes et inclinées formant chacune un dièdre rentrant avec la partie 31 et un dièdre saillant aigu avec une face latérale 4 du corps.The figure 3 differs from the previous one in that the underside of the body is not flat, but hollowed out, and has a flat and horizontal middle part 31 and two side parts 32 flat and inclined, each forming a dihedral entering with part 31 and a sharp protruding dihedral with a lateral face 4 of the body.

L'entrevous de la figure 4 diffère de celui de la figure 2 en ce que le corps présente une face supérieure bombée 35 et une face inférieure comprenant une partie principale incurvée concave 36 laissant subsister de part et d'autre d'étroites parties planes horizontales 37 se raccordant aux faces latérales 4 par les dièdres droits 9.Figure 4 differs from Figure 2 in that the body has a domed upper face 35 and a underside comprising a curved main part concave 36 leaving on either side of narrow horizontal flat parts 37 connecting to the faces lateral 4 by the right dihedral 9.

Enfin, l'entrevous de la figure 5 diffère de celui de la figure 2 par une plus grande hauteur des becquets.Finally, the interjoist in Figure 5 differs from that in Figure 2 by a greater height of the spoilers.

Les figures 6 et 7 montrent des entrevous comprenant une pièce moulée 1 en polystyrène expansé semblable à celle de la figure 2, munie comme connu en soi d'une languette sous forme d'une plaque rapportée destinée à venir au-dessous d'une poutrelle pour améliorer les performances thermiques de l'ensemble. Sur la figure 6, la languette 40 recouvre la totalité de la face inférieure 3 du corps, en étant collée sur la feuille de renfort 30, et fait saillie par rapport à l'une des faces latérales 4. Sur la figure 7, la languette 41 ne recouvre qu'une partie de la face inférieure 3, voisine d'une face latérale 4, et fait saillie de la même manière à partir de cette dernière.Figures 6 and 7 show interjoists comprising a molded part 1 of expanded polystyrene similar to that of Figure 2, provided as known per se with a tongue in the form an attached plate intended to come below a beam to improve the thermal performance of all. In FIG. 6, the tongue 40 covers the whole of the underside 3 of the body, being glued on the reinforcement sheet 30, and protrudes with respect to one of the side faces 4. In FIG. 7, the tongue 41 covers only part of the neighboring lower face 3 a side face 4, and protrudes in the same way at from the latter.

Les figures 10 à 12 sont des schémas analogues aux figures 8 et 9, relatifs à des entrevous selon l'invention.Figures 10 to 12 are diagrams similar to Figures 8 and 9, relating to interjoists according to the invention.

La figure 10 illustre un entrevous semblable à celui de la figure 2.Figure 10 illustrates an interview similar to that of the figure 2.

Dans l'entrevous de la figure 11, la feuille de renfort 30 est prolongée de manière à recouvrir la totalité de la face latérale 4 du corps, l'arête 10 du dièdre rentrant 9 et la face inférieure 8 du becquet 7.In the interjoist of FIG. 11, the reinforcement sheet 30 is extended so as to cover the entire face lateral 4 of the body, the edge 10 of the re-entering dihedral 9 and the underside 8 of spoiler 7.

Sur la figure 12, la feuille de renfort couvre également la totalité des faces 4 et 8 et les arêtes 6 et 10, et se prolonge de manière à couvrir en outre l'arête du dièdre saillant 12 et une partie, adjacente à celle-ci, de la face latérale 11 du becquet 7. En revanche, la région médiane de la largeur de la face inférieure 3 du corps n'est pas recouverte, de sorte que la feuille de renfort est formée de deux éléments séparés symétriques l'un de l'autre par rapport au plan de symétrie médian de l'entrevous.In FIG. 12, the reinforcement sheet also covers the all faces 4 and 8 and edges 6 and 10, and extends to further cover the dihedral edge protruding 12 and a portion, adjacent thereto, of the face lateral 11 of the spoiler 7. On the other hand, the median region of the width of the underside 3 of the body is not covered, so that the backing sheet is formed of two separate elements symmetrical to each other with respect to in the median plane of symmetry of the interjoist.

Les figures 3, 4 et 6 font apparaítre des alvéoles 38 traversant longitudinalement les corps des entrevous. De tels alvéoles peuvent être prévus en option pour toutes les formes d'entrevous et peuvent présenter divers profils.Figures 3, 4 and 6 show the cells 38 passing longitudinally through the bodies of the interjoists. Such cells can be optionally provided for all shapes of you and may have various profiles.

Le tableau ci-après indique pour des entrevous tels qu'illustrés par les figures 8 à 12, réalisés à partir de pièces moulées en polystyrène expansé de deux masses volumiques apparentes différentes, la résistance à la charge représentée par l'effort nécessaire pour la rupture, cet effort étant exercé sur le dessus du corps, soit à 15 cm du plan vertical de la face latérale d'un becquet, soit dans le plan de symétrie longitudinal de l'entrevous, la face inférieure 8 de chaque becquet reposant sur un support, la position d'appui la plus défavorable étant retenue dans chaque cas. Figure Résistance à la charge (daN) Position d'appui Masse volumique 15 kg/m3 Masse volumique 14,5 kg/m3 Latérale Axiale 8 130 100 * 9 135 95 * * 10 150 112 * 11 180 150 * 12 160 125 * * Position d'appui latérale: à 15 cm de la face latérale d'un becquet. Position d'appui latérale: à mi-largeur de l'entrevous. The table below indicates, for interjoists as illustrated in FIGS. 8 to 12, produced from molded parts of expanded polystyrene of two different apparent densities, the resistance to the load represented by the force necessary for the rupture. , this force being exerted on the top of the body, either 15 cm from the vertical plane of the lateral face of a spoiler, or in the longitudinal plane of symmetry of the interjoist, the lower face 8 of each spoiler resting on a support , the most unfavorable support position being retained in each case. figure Load resistance (daN) Support position Density 15 kg / m 3 Density 14.5 kg / m 3 Lateral axial 8 130 100 * 9 135 95 * * 10 150 112 * 11 180 150 * 12 160 125 * * Lateral support position: 15 cm from the lateral face of a spoiler. Lateral support position: mid-width of the interjoist.

On constate que seuls les entrevous selon l'invention présentent une résistance au moins égale à 150 daN, comme exigé par le Cahier des Prescriptions Techniques, pour une masse volumique de 15 kg/m3, cette condition étant également satisfaite par un entrevous selon la figure 11 avec une masse volumique de 14,5 kg/m3. Comme on le voit sur les figures concernées, pour les entrevous selon les figures 10 et 11, une amorce de rupture 20 se produit à partir de l'arête 10, comme dans le cas de l'entrevous non renforcé de la figure 8, tandis que pour l'entrevous des figures 1a, 1b et 2, une amorce de rupture 23 se produit à partir du bord 24 de la feuille de renfort 30 tournée vers le plan de symétrie de l'entrevous.It is noted that only the interjoists according to the invention have a resistance at least equal to 150 daN, as required by the Technical Specifications, for a density of 15 kg / m 3 , this condition also being satisfied by an interjoist according to the Figure 11 with a density of 14.5 kg / m 3 . As can be seen in the figures concerned, for the interjoists according to FIGS. 10 and 11, a rupture initiation 20 occurs from the edge 10, as in the case of the unreinforced interjoist of FIG. 8, while that for the interjoist of FIGS. 1a, 1b and 2, a rupture initiation 23 occurs from the edge 24 of the reinforcement sheet 30 turned towards the plane of symmetry of the interjoist.

Claims (17)

Entrevous comprenant un corps (2) présentant une face inférieure (3) et deux faces latérales opposées (4) se raccordant à celle-ci selon des dièdres saillants (5), et deux becquets (7) s'étendant respectivement le long desdites faces latérales, faisant saillie latéralement au-delà de celles-ci, présentant chacun une face inférieure (8) située plus haut que la face inférieure du corps et se raccordant à la face latérale correspondante (4) selon un dièdre rentrant (9), le corps et les becquets étant formés d'une seule pièce (1) en matière plastique alvéolaire, caractérisé en ce qu'au moins les régions des faces inférieure et latérales du corps adjacentes aux arêtes (6) desdits dièdres saillants (5) sont recouvertes d'une feuille adhérente (30) résistant à la traction.Interjoist comprising a body (2) having a lower face (3) and two opposite lateral faces (4) connecting thereto according to projecting dihedrons (5), and two spoilers (7) extending respectively along said faces lateral, projecting laterally beyond these, each having a lower face (8) situated higher than the lower face of the body and connecting to the corresponding lateral face (4) according to a re-entrant dihedral (9), the body and spoilers being formed in one piece (1) of cellular plastic material, characterized in that at least the regions of the lower and lateral faces of the body adjacent to the edges (6) of said projecting dihedrons (5) are covered with 'an adhesive sheet (30) resistant to traction. Entrevous selon la revendication 1, dans lequel ladite feuille adhérente recouvre la totalité de la face inférieure (3) du corps.Interjoist according to claim 1, wherein said adherent sheet covers the entire underside (3) of the body. Entrevous selon l'une des revendications 1 et 2, dans lequel ladite feuille adhérente recouvre la totalité des faces latérales (4) du corps et les régions des faces inférieures (8) des becquets adjacentes aux arêtes (10) desdits dièdres rentrants (9).Interjoist according to one of claims 1 and 2, in which said adherent sheet covers all of the lateral faces (4) of the body and the regions of the lower faces (8) spoilers adjacent to the edges (10) of said re-entrant dihedrons (9). Entrevous selon la revendication 3, dans lequel ladite feuille adhérente recouvre la totalité des faces inférieures (8) des becquets.Interjoist according to claim 3, wherein said adherent sheet covers all of the lower faces (8) spoilers. Entrevous selon la revendication 4, dans lequel les becquets présentent à l'opposé du corps des faces latérales (11) se raccordant à leurs faces inférieures selon des dièdres saillants (12), et ladite feuille adhérente recouvre en outre les régions des faces latérales des becquet adjacentes à ces derniers dièdres saillants (12). Interjoist according to claim 4, wherein the spoilers have opposite sides of the body (11) connecting to their lower faces according to projecting dihedrons (12), and said adherent sheet covers in addition the regions of the lateral faces of the adjacent spoilers to these latter protruding dihedrons (12). Entrevous selon l'une des revendications précédentes, dans lequel la feuille adhérente (30) est une feuille de polystyrène choc.Interjoist according to one of the preceding claims, wherein the adherent sheet (30) is a sheet of shock polystyrene. Entrevous selon la revendication 6, dans lequel la feuille adhérente a une épaisseur comprise entre 30 et 500 µm.Interjoist according to claim 6, wherein the adherent sheet has a thickness between 30 and 500 .mu.m. Entrevous selon l'une des revendications 1 à 5, dans lequel la feuille adhérente (30) comprend au moins une couche de papier kraft.Interjoist according to one of claims 1 to 5, in which the adherent sheet (30) comprises at least one layer kraft paper. Entrevous selon la revendication 8, dans lequel la feuille adhérente a une masse surfacique comprise entre 50 et 250 g/m2.Interjoist according to claim 8, in which the adherent sheet has a surface mass of between 50 and 250 g / m 2 . Entrevous selon l'une des revendications 1 à 5, dans lequel la feuille adhérente (30) est une feuille de fibre textile naturelle ou synthétique non tissée.Interjoist according to one of claims 1 to 5, in which the adherent sheet (30) is a fiber sheet natural or synthetic non-woven fabric. Entrevous selon l'une des revendications précédentes, dans lequel la feuille adhérente (30) est renforcée par un réseau de fibres tissées ou non tissées.Interjoist according to one of the preceding claims, in which the adherent sheet (30) is reinforced by a network of woven or non-woven fibers. Entrevous selon l'une des revendications 1 à 5, dans lequel la feuille adhérente (30) est un treillis de fibre de verre optionnellement imprégné de colle.Interjoist according to one of claims 1 to 5, in which the adherent sheet (30) is a fiber mesh glass optionally impregnated with glue. Entrevous selon l'une des revendications précédentes, dans lequel la feuille adhérente est structurée et/ou présente des motifs et/ou des couleurs lui conférant un caractère décoratif.Interjoist according to one of the preceding claims, in which the adherent sheet is structured and / or present patterns and / or colors that give it character decorative. Entrevous selon l'une des revendications précédentes, dans lequel la feuille adhérente (30) est liée au corps par collage, thermo-collage ou soudage.Interjoist according to one of the preceding claims, in which the adherent sheet (30) is linked to the body by bonding, heat bonding or welding. Entrevous selon l'une des revendications précédentes, dans lequel la feuille adhérente (30) présente une résistance à la traction plus grande dans la direction perpendiculaire aux arêtes (6, 10) desdits dièdres que dans la direction parallèle à celles-ci.Interjoist according to one of the preceding claims, wherein the adherent sheet (30) has strength at greater traction in the perpendicular direction at the edges (6, 10) of said dihedrons only in the direction parallel to these. Entrevous selon l'une des revendications précédentes, dans lequel la feuille adhérente (30) présente une résistance à la traction au moins égale à 1 kg/mm2 dans la direction perpendiculaire aux arêtes (6, 10) desdits dièdres.Interjoist according to one of the preceding claims, wherein the adherent sheet (30) has a tensile strength at least equal to 1 kg / mm 2 in the direction perpendicular to the edges (6, 10) of said dihedrons. Entrevous selon l'une des revendications précédentes, dans lequel la région de la feuille adhérente (30) recouvrant la face inférieure (3) du corps est elle-même recouverte d'une languette sous forme d'une plaque rapportée (40; 41) qui fait saillie latéralement au-delà de l'une au moins des faces latérales (4) du corps.Interjoist according to one of the preceding claims, wherein the region of the adherent sheet (30) covering the underside (3) of the body is itself covered a tongue in the form of an attached plate (40; 41) which projects laterally beyond at least one of the lateral faces (4) of the body.
EP03291385A 2002-06-14 2003-06-11 Formwork made of reinforced foamed material Withdrawn EP1371792A1 (en)

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Application Number Priority Date Filing Date Title
FR0207364A FR2840933B1 (en) 2002-06-14 2002-06-14 REINFORCED ALVEOLAR PLASTIC MATERIALS
FR0207364 2002-06-14

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2904016A1 (en) * 2006-07-21 2008-01-25 Fabemi Gestion Soc Par Actions Absorptive form slab for building, has main faces edged by primary and secondary recesses respectively, where secondary recesses are aligned vertically with primary recesses, and recesses comprise respective support faces
FR2922916A1 (en) * 2007-10-30 2009-05-01 Placoplatre Sa Prefabricated modular element for dry floor in building construction, has metal sections supported on bearing wall or beam and integrated to structural floor unit near longitudinal edges of unit, which is made of thermal insulating material
EP2500481A1 (en) * 2011-03-18 2012-09-19 Placoplatre Rough timber boarding of formwork for floors, made of foamed plastic material
FR3022273A1 (en) * 2014-06-17 2015-12-18 Knauf Sas BREAK - OPTIMIZED RESISTANCE INTERCONNECTS AND METHOD FOR MANUFACTURING THE SAME.
CN110670780A (en) * 2018-07-02 2020-01-10 谈拥军 Fireproof combined core mold for hollow floor

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FR2391334A1 (en) * 1977-05-16 1978-12-15 Rhone Poulenc Ind Light fireproof, phenolic resin foam construction material - contg. nonwoven synthetic fibrous material
FR2606323A1 (en) * 1986-07-08 1988-05-13 Valeo Component made of cellular plastic, especially a structural component such as a cavity-wall block, having improved flexural and tear strength and method for obtaining such a component
FR2626030A1 (en) * 1988-01-20 1989-07-21 Isobox Sa Insulating floor void in expanded plastic material, such as polystyrene or similar

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Publication number Priority date Publication date Assignee Title
FR2391334A1 (en) * 1977-05-16 1978-12-15 Rhone Poulenc Ind Light fireproof, phenolic resin foam construction material - contg. nonwoven synthetic fibrous material
FR2606323A1 (en) * 1986-07-08 1988-05-13 Valeo Component made of cellular plastic, especially a structural component such as a cavity-wall block, having improved flexural and tear strength and method for obtaining such a component
FR2626030A1 (en) * 1988-01-20 1989-07-21 Isobox Sa Insulating floor void in expanded plastic material, such as polystyrene or similar

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2904016A1 (en) * 2006-07-21 2008-01-25 Fabemi Gestion Soc Par Actions Absorptive form slab for building, has main faces edged by primary and secondary recesses respectively, where secondary recesses are aligned vertically with primary recesses, and recesses comprise respective support faces
FR2922916A1 (en) * 2007-10-30 2009-05-01 Placoplatre Sa Prefabricated modular element for dry floor in building construction, has metal sections supported on bearing wall or beam and integrated to structural floor unit near longitudinal edges of unit, which is made of thermal insulating material
WO2009092890A3 (en) * 2007-10-30 2009-09-17 Placoplatre Prefabricated modular dry-floor element, method of producing such a modular element and dry floor comprising a plurality of modular elements
EP2500481A1 (en) * 2011-03-18 2012-09-19 Placoplatre Rough timber boarding of formwork for floors, made of foamed plastic material
FR2972744A1 (en) * 2011-03-18 2012-09-21 Placoplatre Sa FLOOR FORMWORK CONVEYORS IN ALVEOLA PLASTIC MATERIAL
FR3022273A1 (en) * 2014-06-17 2015-12-18 Knauf Sas BREAK - OPTIMIZED RESISTANCE INTERCONNECTS AND METHOD FOR MANUFACTURING THE SAME.
FR3022272A1 (en) * 2014-06-17 2015-12-18 Knauf Sas BREAK-OPTIMIZED RESISTANCE INTERCONNECTS AND MANUFACTURING METHOD THEREOF
CN110670780A (en) * 2018-07-02 2020-01-10 谈拥军 Fireproof combined core mold for hollow floor

Also Published As

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FR2840933A1 (en) 2003-12-19

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