WO2005038159A1 - Large-span self-supporting metal formwork - Google Patents

Large-span self-supporting metal formwork Download PDF

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Publication number
WO2005038159A1
WO2005038159A1 PCT/FR2004/002587 FR2004002587W WO2005038159A1 WO 2005038159 A1 WO2005038159 A1 WO 2005038159A1 FR 2004002587 W FR2004002587 W FR 2004002587W WO 2005038159 A1 WO2005038159 A1 WO 2005038159A1
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WO
WIPO (PCT)
Prior art keywords
lateral
profiled panel
central area
panel according
profiled
Prior art date
Application number
PCT/FR2004/002587
Other languages
French (fr)
Inventor
Léopold SOKOL
Original Assignee
Usinor
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 Usinor filed Critical Usinor
Priority to ES04817218.3T priority Critical patent/ES2588928T3/en
Priority to EP04817218.3A priority patent/EP1678389B1/en
Publication of WO2005038159A1 publication Critical patent/WO2005038159A1/en

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Classifications

    • 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
    • E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
    • E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
    • E04B5/40—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element with metal form-slabs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0473—U- or C-shaped

Definitions

  • the present invention relates to a profiled panel for long-span formwork intended, in particular, for the manufacture of concrete slabs.
  • floors are produced in the form of concrete slabs, by pouring concrete onto a formwork made up of an assembly of metal panels, the ends of which rest on transverse beams by means of connecting pieces.
  • the panels constitute a circulation and work platform for the personnel who intervene on the site.
  • metal panels remain in place and serve as additional reinforcement for the concrete slab.
  • Such formwork is called "self-supporting formwork”.
  • metal profiled panels of omega-shaped section comprising a ribbed upper central area framed by two inclined webs each extended by a ribbed lower horizontal flange.
  • Each core has two longitudinal folds, one arranged near the central beach and the other near the bottom flange, intended to increase rigidity.
  • the ribs of the upper central area are arranged near the edges of the latter and the ribs of the lower soles are arranged at mid-width of the soles. Due to their mechanical performance, such panels have the drawback of not allowing a span of around 5.50 m to be exceeded. In addition, the mechanical resistance of the floors obtained and the protection of the framework against fire are not always optimal.
  • the object of the present invention is to remedy these drawbacks by proposing an optimized profiled panel so as, in particular, to be able to reach a range of up to 6m, and easy to achieve by profiling.
  • the subject of the invention is a profiled panel for long-span formwork having an omega-type profile, the profiled panel comprising:
  • the profiled panel is such that at least one longitudinal stiffening ply of each lateral core is placed in the part of the lateral core intended to work in compression when the profiled panel is placed on a structure and covered with concrete, and the part intended for working in traction does not have a longitudinal stiffening fold.
  • the part of a lateral core intended to work in compression is, in general, included in the upper half of the lateral core adjacent to the upper central area, and the part of the lateral core intended to work in traction comprises at least the lower half of the lateral core adjacent to a lower sole.
  • At least one lateral core may include a vertical notch disposed between the at least one stiffening ply and the corresponding lower sole.
  • at least one lower sole has on its external lateral edge an edge stiffener constituted for example by a raised edge.
  • the bottom of at least one sole is flat and does not have an intermediate stiffener.
  • the angle ⁇ formed by a lateral wing with a plane parallel to the upper central range is between 74.8 ° and 79.8 °.
  • the width P e of the side strip of the upper central area extending between the lateral edge of the upper central area and the edge of the longitudinal rib disposed on the side of said lateral edge of the upper central area is greater than 8% of the width l pc of the upper central area, and the width l c of the notched area of the upper central area is preferably greater than 60% and better still 75% of the width l pc of said central area.
  • the length of the profiled panel can be more than 5.7 m.
  • the profiled panel is for example of steel and preferably of galvanized steel, and can be manufactured by profiling and its thickness is preferably between 0.9 mm and 1.5 mm.
  • the profiled panel thus produced has the advantage of making it possible to increase the payload and to increase the range of the formwork, while facilitating the profiling operation, in particular by simplifying the necessary profiling tool.
  • the profiled panel is particularly suitable for the production of floor slabs for car parks, industrial buildings, sales stores, storage stores, or any other similar building.
  • the invention also relates to a floor comprising a concrete slab poured onto a self-supporting formwork consisting of adjacent profiled panels according to the invention, assembled by stitching, supported by transverse beams.
  • FIG. 1 is a schematic view of the transverse profile of a profiled panel
  • FIG. 2 is a partial representation of a self-supporting formwork.
  • a profiled panel for formwork according to the invention of generally rectangular shape, has a transverse profile of the omega type as shown in Figure 1. Because of this omega profile, the profiled panel has, on its longitudinal central part, an upper central area 1 extending in the direction of the length. This upper central region 1 has two longitudinal ribs 4 and 4 ′ separated by a notch 5. These longitudinal ribs 4, 4 ′, as well as the notch 5, are intended to give the upper central region 1, sufficient rigidity so that, when the panel is placed on beams during the manufacture of a floor, the surface formed by the upper central area 1 can serve as a working surface and a circulation surface for workers working on the site.
  • the central area 1 is extended on either side, along its lateral edges, by two cores 2 and 2 ′, inclined, extending towards the bottom of the panel and towards the outside of the panel, so as to form a trapezoid flared down (relative to the orientation of the figure which corresponds to the orientation of the panel when it is used).
  • the lateral webs 2 and 2 'each have a longitudinal stiffener 6 and 6' extending over the entire length of the panel. Each stiffener 6 or 6 'consists of two folds which form a slight recess in the lateral core.
  • Each lateral core 2 and 2 ′ extend in its lower part by a sole 3 or 3 ′, horizontal, extending towards the outside of the panel.
  • each of the soles are extended by flanges 9 or 9 'raised upwards. These edges 9 or 9 'raised upwards serve as stiffeners.
  • a panel 11 When such a panel 11 is used in a self-supporting formwork as shown in Figure 2, it is supported by means of levers 12 on two beams 10 parallel to each other, spaced a length close to the length of the panel.
  • levers 12 When such a panel 11 is used in a self-supporting formwork as shown in Figure 2, it is supported by means of levers 12 on two beams 10 parallel to each other, spaced a length close to the length of the panel.
  • Several panels 11 are thus arranged adjacent to each other, and the lateral flanges (not visible in the figure) of two adjacent panels are fitted one into the other and secured by stitching.
  • This assembly constitutes a continuous formwork onto which concrete is poured so as to form a slab which extends over the surface of the formwork.
  • the panels 11 undergo bending forces such that the upper parts 13 of the lateral cores are subjected to compressive stresses, and the lower parts 14 of the lateral cores are subjected to tensile stresses, especially in the longitudinal direction.
  • the relative importance of the zones subjected to traction and the zones subjected to compression depends on different geometric parameters such as the height of the cores, the thickness of the concrete layer, the length and the width of the panels. A person skilled in the art knows how to determine from these parameters what is the importance of the zones subjected to traction and the importance of zones subjected to compression.
  • the profiled panels according to the invention comprise cores 2, 2 'of which only the part intended to work in compression comprises a longitudinal stiffener 6, 6', and of which the part intended to work in traction, does not comprise any longitudinal stiffener and therefore is planar at least in the transverse direction.
  • Each core 2 or 2 ′ therefore has in its upper part a flat upper range 7 or 7 ′, of width a s and, in its lower part, a lower range 8 or 8 ′ flat at least in the transverse direction.
  • the upper areas 7 or 7 ' are separated from the lower areas 8 or 8' by the stiffeners 6 or 6 ', of width U ra .
  • the lower area 8, 8 ′ plane in the transverse direction is not necessarily plane in the longitudinal direction.
  • vertical notching is meant a notching consisting of notches each extending in the direction of the height of the core.
  • the zone intended to work in compression represents at most half the height of the core, and the part intended to work in traction represents at least half the height of the core.
  • the width a s of the upper range 7 or 7 'of the core is preferably less than half the width of the core, and the width of the lower range 8 or 8' of the core is more than half the width of the web.
  • the souls thus produced have improved fire resistance.
  • the inventors have also found that by properly choosing the angle ⁇ formed by a core with a horizontal plane parallel to the plane of the panel, that is to say at the plane of the upper central area, it was possible to optimize the weight of the sheet and the weight of the concrete, and ultimately optimize the useful capacity of a floor element. In particular to obtain satisfactory results, the angle ⁇ must be between 60 ° and 80 °. If the angle is too small, although the weight of the sheet is reduced, the weight of the concrete is significantly increased and the span is reduced.
  • the calculation codes are provided for angles greater than 60% and the use of smaller angles requires obtaining prior agreements. If the angle is greater than 80 °, it is no longer possible to stack and unstack the panels easily. But more specifically, the inventors have found that the range was optimized for an angle ⁇ between 74.8 ° and 79.8 °.
  • the flanges 3 and 3 ′ of the profiled panel are flat and do not have central longitudinal stiffeners. However, each sole 3 or 3 ′ has on its external lateral edge, an edge stiffener. This edge stiffener consists of a raised edge 9, 9 '.
  • the inventors have in fact found that by not providing a stiffener in the axial part of the sole, but by providing an edge stiffener, the mechanical behavior of the panel is improved, and the implementation is facilitated, in particular by making the junctions between two more watertight adjacent panels, which is useful when pouring concrete, while achieving a profile that is easier to produce by profiling.
  • the width P e of the part 21 or 21 ′ of the upper central area 1 located between the edge of the upper central area 1 and the edge of a longitudinal rib 4 or 4 ′ may be greater than or equal to 8% of the width l pc of the upper central area 1.
  • the width l c of the notched area 5 of the upper area 1 can have a width greater than or equal to 60% or better 75% of the width l pc of the area superior central 1.
  • the profile of the profiled panel can also be optimized in order to facilitate the assembly of two adjacent panels.
  • the height h of a lateral core 2 may be slightly less than the height h 'of the other lateral core 2', the difference in height being equal to the thickness of the sheet of which the profiled panel is made up.
  • the width s m of the lateral sole 3 corresponding to the first lateral core 2 may be slightly less than the width s m 'of the lateral sole 3' corresponding to the other lateral core so that, when two panels are arranged adjacent to each other, the lateral sole of one of the panels can fit perfectly into the lateral sole of the adjacent panel.
  • the two upper central areas of the two panels are at the same height.
  • the profiled panel has a useful width which is generally between 650 mm and 800 mm, a height h of between 200mm and 220 mm, and it can have a length which can exceed 5.7 m and even reach 6.2 m, from so as to allow formwork having a span of approximately 6 m.
  • the useful width corresponds to the module or to the pitch of the self-supporting formwork and corresponds to the distance I separating the axes of two adjacent panels or, which amounts to the same thing, the axes of the two lower flanges of the same panel.
  • the panel is made of galvanized steel and manufactured by profiling a sheet of thickness between 0.9 mm and 1.5 mm. The thickness must be greater than 0.9 mm to ensure sufficient rigidity.
  • the thickness should preferably remain less than 1.5 mm in order to limit the weight of the panels. Indeed, it must be able to be manipulated manually to be implemented, in particular, in multi-storey buildings.
  • the dimensions of the longitudinal stiffeners 4, 4 ′ of the upper central area 1 are preferably such that the opening U sp is between 25 and 45 mm, the width of the bottom U ⁇ p is between 0 and 15 mm, and the height H rp is between 10 and 25 mm.
  • the dimensions of the longitudinal stiffeners 6, 6 'of the webs 2, 2' are such that the width U ra is between 20 and 40 mm, and the height H ra is between 15 and 25 mm.
  • the width of the stiffener of the sole edge b is between 15 and 25 mm.
  • the stiffeners are arranged in such a way that the distance P e between the edge of a longitudinal stiffener 4 or 4 'of the upper central area 1 and the edge of said upper area 1 is between 40 and 60 mm, the distance Pj between the edge of the same stiffener 4 or 4 ′ and the start of the notched range 5 is between 40 and 60 mm.
  • the distance a s which separates the upper edge of the lateral core 2 or 2 'and the longitudinal stiffener 6 or 6' of the lateral core is preferably between 40 and 80 mm.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

The invention relates to a profiled sheet for large-span formwork, having an omega profile, said profiled sheet comprising an upper horizontal central sheet (1), running in the longitudinal direction of the profiled sheet, comprising two longitudinal ribs (4), separated by a transverse notching (5), two inclined lateral wings (2) extend the central sheet (1) to each side thereof, extending downwards and towards the outside of the central sheet, each comprising at least one longitudinal reinforcing fold (6) and two lower horizontal flanges (3) laterally extending the lateral webs and running towards the outside of the profiled sheet. The at least one lateral reinforcing fold (6) for each lateral web (2) is arranged in the part of the lateral web embodied to work in compression when the profiled sheet is arranged on a structure and covered in concrete and the part embodied to work in tension has no longitudinal reinforcing fold. The invention further relates to self-supporting formwork and concrete slab cast on the self-supporting formwork.

Description

Coffrage métallique autoportant à grande portée. Self-supporting long-span metal formwork.
La présente invention est relative à un panneau profilé pour coffrage à longue portée destiné, notamment, à la fabrication de dalles en béton. Dans différents types de bâtiments, on réalise des planchers sous forme de dalles en béton, en coulant du béton sur un coffrage constitué d'un assemblage de panneaux métalliques dont les extrémités reposent sur des poutres transversales par l'intermédiaire de pièces de liaison. Pendant la réalisation des planchers, et avant que le béton soit coulé, les panneaux constituent une plate-forme de circulation et de travail pour le personnel qui intervient sur le chantier. Après solidification du béton, des panneaux métalliques restent en place et servent d'armature supplémentaire à la dalle de béton. Un tel coffrage est appelé "coffrage autoportant". Pour fabriquer des coffrages autoportants, on utilise des panneaux profilés métalliques de section en forme d'oméga comportant une plage centrale supérieure nervurée encadrée par deux âmes inclinées prolongées chacune par une semelle horizontale inférieure nervurée. Chaque âme comporte deux plis longitudinaux, l'un disposé près de la plage centrale et l'autre près de la semelle inférieure, destinés à augmenter la rigidité. Les nervures de la plage centrale supérieure sont disposées à proximité des rives de celle-ci et les nervures des semelles inférieures sont disposées à mi-largeur des semelles. Du fait de leur performances mécaniques, de tels panneaux présentent l'inconvénient de ne pas permettre de dépasser une portée d'environ 5,50 m. En outre la résistance mécanique des planchers obtenus ainsi que la protection de l'armature contre le feu ne sont pas toujours optimales. Enfin ces profiles sont parfois difficiles à réaliser de façon simple par pliage ou par profilage. Le but de la présente invention est de remédier à ces inconvénients en proposant un panneau profilé optimisé de façon, notamment, à pouvoir atteindre une portée pouvant atteindre 6m, et facile à réaliser par profilage. A cet effet, l'invention a pour objet, un panneau profilé pour coffrage à longue portée ayant un profil du type oméga, le panneau profilé comportant :The present invention relates to a profiled panel for long-span formwork intended, in particular, for the manufacture of concrete slabs. In different types of buildings, floors are produced in the form of concrete slabs, by pouring concrete onto a formwork made up of an assembly of metal panels, the ends of which rest on transverse beams by means of connecting pieces. During the realization of the floors, and before the concrete is poured, the panels constitute a circulation and work platform for the personnel who intervene on the site. After the concrete has solidified, metal panels remain in place and serve as additional reinforcement for the concrete slab. Such formwork is called "self-supporting formwork". To manufacture self-supporting formwork, metal profiled panels of omega-shaped section are used, comprising a ribbed upper central area framed by two inclined webs each extended by a ribbed lower horizontal flange. Each core has two longitudinal folds, one arranged near the central beach and the other near the bottom flange, intended to increase rigidity. The ribs of the upper central area are arranged near the edges of the latter and the ribs of the lower soles are arranged at mid-width of the soles. Due to their mechanical performance, such panels have the drawback of not allowing a span of around 5.50 m to be exceeded. In addition, the mechanical resistance of the floors obtained and the protection of the framework against fire are not always optimal. Finally, these profiles are sometimes difficult to produce in a simple manner by folding or by profiling. The object of the present invention is to remedy these drawbacks by proposing an optimized profiled panel so as, in particular, to be able to reach a range of up to 6m, and easy to achieve by profiling. To this end, the subject of the invention is a profiled panel for long-span formwork having an omega-type profile, the profiled panel comprising:
- une plage centrale supérieure horizontale s'étendant dans le sens longitudinal du panneau profilé et comportant deux nervures longitudinales séparées par un crantage transversal,- a horizontal upper central area extending in the longitudinal direction of the profiled panel and comprising two longitudinal ribs separated by a transverse notch,
- deux ailes latérales inclinées prolongeant la plage centrale de chaque côté de la plage centrale, s'étendant vers le dessous et vers l'extérieur de la plage centrale, et comportant chacune au moins un pli raidisseur longitudinal, - et deux semelles inférieures horizontales prolongeant latéralement les âmes latérales et s'étendant vers l'extérieur du panneau profilé. Le panneau profilé est tel que l'au moins un pli raidisseur longitudinal de chaque âme latérale est disposé dans la partie de l'âme latérale destinée à travailler en compression lorsque le panneau profilé est disposé sur une structure et recouvert de béton, et la partie destinée à travailler en traction ne comporte pas de pli raidisseur longitudinal. La partie d'une âme latérale destinée à travailler en compression est, en général, comprise dans la moitié supérieure de l'âme latérale voisine de la plage centrale supérieure, et la partie de l'âme latérale destinée à travailler en traction comprend au moins la moitié inférieure de l'âme latérale voisine d'une semelle inférieure. Au moins une âme latérale peut comporter un crantage vertical disposé entre l'au moins un pli raidisseur et la semelle inférieure correspondante. De préférence, au moins une semelle inférieure comporte sur son bord latéral externe un raidisseur de bord constitué par exemple par un bord relevé. De préférence, le fond d'au moins une semelle est plat et ne comporte pas de raidisseur intermédiaire. De préférence, l'angle α que forme une aile latérale avec un plan parallèle à la plage centrale supérieure est compris entre 74,8° et 79,8°. De préférence également, la largeur Pe de la bande latérale de la plage centrale supérieure s'étendant entre le bord latéral de la plage centrale supérieure et le bord de la nervure longitudinal disposée du côté dudit bord latéral de la plage centrale supérieure est supérieure à 8 % de la largeur lpc de la plage centrale supérieure, et la largeur lc de la zone crantée de la plage centrale supérieure est de préférence supérieure à 60 % et mieux 75 % de la largeur lpc de ladite plage centrale. La longueur du panneau profilé peut être supérieure à 5,7 m. Le panneau profilé est par exemple en acier et de préférence, en acier galvanisé, et peut être fabriqué par profilage et son épaississeur est, de préférence comprise entre 0,9 mm et 1 ,5 mm. Le panneau profilé ainsi réalisé présente l'avantage de permettre d'augmenter la charge utile et d'augmenter la portée du coffrage, tout en facilitant l'opération de profilage, notamment en simplifiant l'outil de profilage nécessaire. Le panneau profilé est particulièrement adapté à la réalisation de dalles de plancher pour parkings, bâtiments industriels, magasins de vente, magasins de stockage, ou tout autre bâtiment analogue. L'invention concerne également un plancher comportant une dalle en béton coulé sur un coffrage autoportant constitué de panneaux profilés adjacents selon l'invention, assemblés par couturage, supportés par des poutres transversales. L'invention va maintenant être décrite de façon plus précise mais non limitative, en regard des figures annexées dans lesquelles :- two inclined lateral wings extending the central area on each side of the central area, extending below and towards the outside of the central area, and each comprising at least one longitudinal stiffening fold, - and two horizontal lower flanges extending laterally the lateral webs and extending towards the outside of the profiled panel. The profiled panel is such that at least one longitudinal stiffening ply of each lateral core is placed in the part of the lateral core intended to work in compression when the profiled panel is placed on a structure and covered with concrete, and the part intended for working in traction does not have a longitudinal stiffening fold. The part of a lateral core intended to work in compression is, in general, included in the upper half of the lateral core adjacent to the upper central area, and the part of the lateral core intended to work in traction comprises at least the lower half of the lateral core adjacent to a lower sole. At least one lateral core may include a vertical notch disposed between the at least one stiffening ply and the corresponding lower sole. Preferably, at least one lower sole has on its external lateral edge an edge stiffener constituted for example by a raised edge. Preferably, the bottom of at least one sole is flat and does not have an intermediate stiffener. Preferably, the angle α formed by a lateral wing with a plane parallel to the upper central range is between 74.8 ° and 79.8 °. Preferably also, the width P e of the side strip of the upper central area extending between the lateral edge of the upper central area and the edge of the longitudinal rib disposed on the side of said lateral edge of the upper central area is greater than 8% of the width l pc of the upper central area, and the width l c of the notched area of the upper central area is preferably greater than 60% and better still 75% of the width l pc of said central area. The length of the profiled panel can be more than 5.7 m. The profiled panel is for example of steel and preferably of galvanized steel, and can be manufactured by profiling and its thickness is preferably between 0.9 mm and 1.5 mm. The profiled panel thus produced has the advantage of making it possible to increase the payload and to increase the range of the formwork, while facilitating the profiling operation, in particular by simplifying the necessary profiling tool. The profiled panel is particularly suitable for the production of floor slabs for car parks, industrial buildings, sales stores, storage stores, or any other similar building. The invention also relates to a floor comprising a concrete slab poured onto a self-supporting formwork consisting of adjacent profiled panels according to the invention, assembled by stitching, supported by transverse beams. The invention will now be described in a more precise but nonlimiting manner, with reference to the appended figures in which:
- la figure 1 est une vue schématique du profil transversal d'un panneau profilé,FIG. 1 is a schematic view of the transverse profile of a profiled panel,
- la figure 2 est une représentation partielle d'un coffrage autoportant. Un panneau profilé pour coffrage selon l'invention, de forme généralement rectangulaire, comporte un profil transversale du type oméga tel que représenté à la figure 1. Du fait de ce profil en oméga, le panneau profilé comporte, sur sa partie centrale longitudinale, une plage centrale supérieure 1 s'étendant dans le sens de la longueur. Cette plage centrale supérieure 1 comporte deux nervures longitudinales 4 et 4' séparées par un crantage 5. Ces nervures longitudinales 4, 4', ainsi que le crantage 5, sont destinés à donner à la plage centrale supérieure 1 , une rigidité suffisante pour que, lorsque le panneau est posé sur des poutres lors de la fabrication d'un plancher, la surface constituée par la plage centrale supérieure 1 puisse servir de surface de travail et de surface de circulation pour les ouvriers travaillant sur le chantier. La plage centrale 1 est prolongée de part et d'autre, selon ses bords latéraux, par deux âmes 2 et 2', inclinées, s'étendant vers le dessous du panneau et vers l'extérieur du panneau, de façon à former un trapèze évasé vers le bas (par rapport à l'orientation de la figure qui correspond à l'orientation du panneau lorsqu'il est utilisé). Les âmes latérales 2 et 2', comportent chacune un raidisseur 6 et 6' longitudinal s'étendant sur toute la longueur du panneau. Chaque raidisseur 6 ou 6' est constitué de deux plis qui forment un léger décrochement dans l'âme latérale. Chaque âme latérale 2 et 2', se prolongent dans sa partie inférieure par une semelle 3 ou 3', horizontale, s'étendant vers l'extérieur du panneau. Les bord latéraux de chacune des semelles sont prolongés par des rebords 9 ou 9' relevés vers le haut. Ces rebords 9 ou 9' relevés vers le haut servent de raidisseurs. Lorsque un tel panneau 11 est utilisé dans un coffrage autoportant tel que représenté à la figure 2, il s'appuie par l'intermédiaire de leviers 12 sur deux poutres 10 parallèles entre elles, espacées d'une longueur proche de la longueur du panneau. Plusieurs panneaux 11 sont disposés ainsi de façon adjacente, et les semelles latérales (non visibles sur la figure) de deux panneaux adjacents sont emboîtées l'une dans l'autre et solidarisées par coutûrage. Cet ensemble constitue un coffrage continu sur lequel on coule du béton de façon à former une dalle qui s'étend sur la surface du coffrage. Lorsque le béton est coulé sur le coffrage, les panneaux 11 subissent des efforts de flexion tels que les parties supérieures 13 des âmes latérales sont soumises à des contraintes de compression, et les parties inférieures 14 des âmes latérales sont soumises à des contraintes de traction, notamment dans le sens longitudinal. L'importance relative des zones soumises à la traction et des zones soumises à la compression dépend de différents paramètres géométriques tels que la hauteur des âmes, l'épaisseur de la couche de béton, la longueur et la largeur des panneaux. L'homme du métier sait déterminer à partir de ces paramètres quelle est l'importance des zones soumises à la traction et l'importance des zones soumises à la compression. Les inventeurs ont constaté de façon nouvelle et surprenante que le comportement mécanique d'un tel panneau profilé est très nettement amélioré lorsqu'on ne prévoit de raidisseur que dans la partie de l'âme soumise à des efforts de compression. De ce fait, les panneaux profilés selon l'invention comportent des âmes 2, 2' dont seule la partie destinée à travailler en compression comporte un raidisseur longitudinal 6, 6', et dont la partie destinée à travailler en traction, ne comporte pas de raidisseur longitudinal et par conséquent, est plane au moins dans le sens transversal. Chaque âme 2 ou 2' comporte donc dans sa partie supérieure une plage supérieure 7 ou 7' plane, de largeur as et, dans sa partie inférieure, une plage inférieure 8 ou 8' plane au moins dans le sens transversal. Les plages supérieures 7 ou 7' sont séparées des plages inférieures 8 ou 8' par les raidisseurs 6 ou 6', de largeur Ura. La plage inférieure 8, 8' plane dans le sens transversal n'est pas nécessairement plane dans le sens longitudinal. En effet, le comportement mécanique du panneau profilé peut être amélioré en prévoyant un crantage verticale sur la partie de l'âme qui se trouve dans la partie destinée à travailler en traction. Par crantage vertical, on entend un crantage constitué de crans s'étendant chacun dans le sens de la hauteur de l'âme. D'une façon générale, la zone destinée à travailler en compression représente au maximum la moitié de la hauteur de l'âme, et la partie destinée à travailler en traction représente au moins la moitié de la hauteur de l'âme. De ce fait, la largeur as de la plage supérieure 7 ou 7' de l'âme est de préférence inférieure à la moitié de la largeur de l'âme, et la largeur de la plage inférieure 8 ou 8' de l'âme est supérieure à la moitié de la largeur de l'âme. Les âmes ainsi réalisées ont une tenue au feu améliorée. Les inventeurs ont également constaté qu'en choisissant convenablement l'angle α que forme une âme avec un plan horizontal parallèle au plan du panneau, c'est à dire au plan de la plage centrale supérieure, on pouvait optimiser le poids de la tôle et le poids du béton, et finalement optimiser la portée utile d'un élément de plancher. En particulier pour obtenir des résultats satisfaisants, l'angle α doit être compris entre 60° et 80°. Si l'angle est trop faible, bien que le poids de la tôle soit réduit, le poids du béton est sensiblement augmenté et la porté est réduite. En outre, les codes de calculs sont prévus pour des angles supérieurs à 60 % et l'utilisation d'angles plus faibles nécessitent une obtention d'accords préalables. Si l'angle est supérieur à 80°, il n'est plus possible d'empiler et de dépiler facilement les panneaux. Mais plus précisément, les inventeurs ont constaté que la portée était optimisée pour un angle α compris entre 74,8° et 79,8°. Les semelles 3 et 3' du panneau profilé sont planes et ne comportent pas de raidisseurs longitudinaux centraux. Cependant, chaque semelle 3 ou 3' comporte sur son bord latéral externe, un raidisseur de bord. Ce raidisseur de bord est constitué par un bord relevé 9, 9'. Les inventeurs ont en effet constaté qu'en ne prévoyant pas de raidisseur dans la partie axiale de la semelle, mais en prévoyant un raidisseur de bord, on améliorait le comportement mécanique du panneau, et on facilitait la mise en œuvre, en particulier en rendant les jonctions entre deux panneaux adjacents plus étanches, ce qui est utile lors du coulage du béton, tout en aboutissant à un profil plus facile à réaliser par profilage. Enfin, la largeur Pe de la partie 21 ou 21' de la plage centrale supérieure 1 située entre le rebord de la plage centrale supérieure 1 et le bord d'une nervure longitudinale 4 ou 4', peut être supérieure ou égale à 8 % de la largeur lpc de la plage centrale supérieure 1. En outre la largeur lc de la zone crantée 5 de la plage supérieure 1 peut avoir une largeur supérieure ou égale à 60 % ou mieux 75 % de la largeur lpc de la plage centrale supérieure 1. Ces dispositions géométrique sont également nécessaire pour améliorer et optimiser le comportement mécanique du panneau profilé. Le profil du panneau profilé peut également être optimisé de façon à faciliter l'assemblage de deux panneaux adjacents. Pour cela la hauteur h d'une âme latérale 2, peut être légèrement inférieure à la hauteur h' de l'autre âme latérale 2', la différence de hauteur étant égale à l'épaisseur de la tôle dont est constitué le panneau profilé. De même, la largeur sm de la semelle latérale 3 correspondant à la première âme latérale 2, peut être légèrement inférieure à la largeur sm' de la semelle latérale 3' correspondant à l'autre âme latérale de façon à ce que, lorsque deux panneaux sont disposés de façon adjacente, la semelle latérale d'un des panneaux puisse s'emboîter parfaitement dans la semelle latérale du panneau adjacent. Ainsi, et lorsque les hauteurs h et h' sont adaptées comme indiqué ci-dessus, les deux plages centrales supérieures des deux panneaux se trouvent à même hauteur. Le panneau profilé a une largeur utile qui se trouve en générale entre 650 mm et 800 mm, une hauteur h compris entre 200mm et 220 mm, et il peut avoir une longueur pouvant dépasser 5,7 m et même atteindre 6,2 m, de façon à permettre de réaliser des coffrages ayant une porté de 6 m environ. La largeur utile correspond au module ou au pas du coffrage autoportant et correspond à la distance I séparant les axes de deux panneaux adjacents ou, ce qui revient au même, les axes des deux semelles inférieures d'un même panneau. En général, le panneau est en acier galvanisé et fabriqué par profilage d'une tôle d'épaisseur comprise entre 0,9 mm et 1 ,5 mm. L'épaisseur doit être supérieure à 0,9 mm pour assurer une rigidité suffisante. L'épaisseur doit, de préférence, rester inférieur à 1 ,5 mm afin de limiter le poids des panneau. En effet, celui-ci doit pouvoir être manipulé manuellement pour être mis en œuvre, notamment, dans des bâtiments à plusieurs étages. Les d imensions des raidisseurs longitudinaux 4, 4' de la plage centrale supérieure 1 sont de préférence tels que l'ouverture Usp soit comprise entre 25 et 45 mrn, la largeur du fond Uιp soit comprise entre 0 et 15 mm, et la hauteur Hrp soit comprise entre 10 et 25 mm. Les dimensions des raidisseurs 6, 6' longitudinaux des âmes 2, 2' sont tels que la largeur Ura est comprise entre 20 et 40 mm, et la hauteur Hra est comprise entre 15 et 25 mm. La largeur du raidisseur du bord de semelle b est compris entre 15 et 25 mm. Les raidisseurs sont disposés de façon telle que la distance Pe entre le rebord d'un raidisseur longitudinal 4 ou 4' de la plage centrale supérieure 1 et le rebord de ladite plage supérieure 1 est comprise entre 40 et 60 mm, la distance Pj entre le rebord du même raidisseur 4 ou 4' et le début de la plage crantée 5 est compris entre 40 et 60 mm. Enfin, la distance as qui sépare le bord supérieure de l'âme latérale 2 ou 2' et le raidisseur longitudinal 6 ou 6' de l'âme latérale, est compris de préférence entre 40 et 80 mm. A l'intérieur de ces fourchettes, les valeurs exactes des paramètres qui définissent la géométrie du panneau profilé peuvent être optimisées par le calcul ou par expérimentation de façon à obtenir le panneau ayant le meilleur comportement mécanique possible sur la longueur la plus importante. Ainsi optimisé le panneau permet d'obtenir des portés utiles d'environ 6 m. En outre, son profil n'est constitué que de plis simples qui permettent de le fabriquer facilement par profilage. - Figure 2 is a partial representation of a self-supporting formwork. A profiled panel for formwork according to the invention, of generally rectangular shape, has a transverse profile of the omega type as shown in Figure 1. Because of this omega profile, the profiled panel has, on its longitudinal central part, an upper central area 1 extending in the direction of the length. This upper central region 1 has two longitudinal ribs 4 and 4 ′ separated by a notch 5. These longitudinal ribs 4, 4 ′, as well as the notch 5, are intended to give the upper central region 1, sufficient rigidity so that, when the panel is placed on beams during the manufacture of a floor, the surface formed by the upper central area 1 can serve as a working surface and a circulation surface for workers working on the site. The central area 1 is extended on either side, along its lateral edges, by two cores 2 and 2 ′, inclined, extending towards the bottom of the panel and towards the outside of the panel, so as to form a trapezoid flared down (relative to the orientation of the figure which corresponds to the orientation of the panel when it is used). The lateral webs 2 and 2 'each have a longitudinal stiffener 6 and 6' extending over the entire length of the panel. Each stiffener 6 or 6 'consists of two folds which form a slight recess in the lateral core. Each lateral core 2 and 2 ′, extend in its lower part by a sole 3 or 3 ′, horizontal, extending towards the outside of the panel. The lateral edges of each of the soles are extended by flanges 9 or 9 'raised upwards. These edges 9 or 9 'raised upwards serve as stiffeners. When such a panel 11 is used in a self-supporting formwork as shown in Figure 2, it is supported by means of levers 12 on two beams 10 parallel to each other, spaced a length close to the length of the panel. Several panels 11 are thus arranged adjacent to each other, and the lateral flanges (not visible in the figure) of two adjacent panels are fitted one into the other and secured by stitching. This assembly constitutes a continuous formwork onto which concrete is poured so as to form a slab which extends over the surface of the formwork. When the concrete is poured onto the formwork, the panels 11 undergo bending forces such that the upper parts 13 of the lateral cores are subjected to compressive stresses, and the lower parts 14 of the lateral cores are subjected to tensile stresses, especially in the longitudinal direction. The relative importance of the zones subjected to traction and the zones subjected to compression depends on different geometric parameters such as the height of the cores, the thickness of the concrete layer, the length and the width of the panels. A person skilled in the art knows how to determine from these parameters what is the importance of the zones subjected to traction and the importance of zones subjected to compression. The inventors have found in a new and surprising way that the mechanical behavior of such a profiled panel is very much improved when a stiffener is only provided in the part of the core subjected to compressive forces. Therefore, the profiled panels according to the invention comprise cores 2, 2 'of which only the part intended to work in compression comprises a longitudinal stiffener 6, 6', and of which the part intended to work in traction, does not comprise any longitudinal stiffener and therefore is planar at least in the transverse direction. Each core 2 or 2 ′ therefore has in its upper part a flat upper range 7 or 7 ′, of width a s and, in its lower part, a lower range 8 or 8 ′ flat at least in the transverse direction. The upper areas 7 or 7 'are separated from the lower areas 8 or 8' by the stiffeners 6 or 6 ', of width U ra . The lower area 8, 8 ′ plane in the transverse direction is not necessarily plane in the longitudinal direction. Indeed, the mechanical behavior of the profiled panel can be improved by providing a vertical notching on the part of the core which is in the part intended to work in traction. By vertical notching is meant a notching consisting of notches each extending in the direction of the height of the core. In general, the zone intended to work in compression represents at most half the height of the core, and the part intended to work in traction represents at least half the height of the core. Therefore, the width a s of the upper range 7 or 7 'of the core is preferably less than half the width of the core, and the width of the lower range 8 or 8' of the core is more than half the width of the web. The souls thus produced have improved fire resistance. The inventors have also found that by properly choosing the angle α formed by a core with a horizontal plane parallel to the plane of the panel, that is to say at the plane of the upper central area, it was possible to optimize the weight of the sheet and the weight of the concrete, and ultimately optimize the useful capacity of a floor element. In particular to obtain satisfactory results, the angle α must be between 60 ° and 80 °. If the angle is too small, although the weight of the sheet is reduced, the weight of the concrete is significantly increased and the span is reduced. In addition, the calculation codes are provided for angles greater than 60% and the use of smaller angles requires obtaining prior agreements. If the angle is greater than 80 °, it is no longer possible to stack and unstack the panels easily. But more specifically, the inventors have found that the range was optimized for an angle α between 74.8 ° and 79.8 °. The flanges 3 and 3 ′ of the profiled panel are flat and do not have central longitudinal stiffeners. However, each sole 3 or 3 ′ has on its external lateral edge, an edge stiffener. This edge stiffener consists of a raised edge 9, 9 '. The inventors have in fact found that by not providing a stiffener in the axial part of the sole, but by providing an edge stiffener, the mechanical behavior of the panel is improved, and the implementation is facilitated, in particular by making the junctions between two more watertight adjacent panels, which is useful when pouring concrete, while achieving a profile that is easier to produce by profiling. Finally, the width P e of the part 21 or 21 ′ of the upper central area 1 located between the edge of the upper central area 1 and the edge of a longitudinal rib 4 or 4 ′, may be greater than or equal to 8% of the width l pc of the upper central area 1. In addition, the width l c of the notched area 5 of the upper area 1 can have a width greater than or equal to 60% or better 75% of the width l pc of the area superior central 1. These geometrical arrangements are also necessary to improve and optimize the mechanical behavior of the profiled panel. The profile of the profiled panel can also be optimized in order to facilitate the assembly of two adjacent panels. For this, the height h of a lateral core 2, may be slightly less than the height h 'of the other lateral core 2', the difference in height being equal to the thickness of the sheet of which the profiled panel is made up. Likewise, the width s m of the lateral sole 3 corresponding to the first lateral core 2, may be slightly less than the width s m 'of the lateral sole 3' corresponding to the other lateral core so that, when two panels are arranged adjacent to each other, the lateral sole of one of the panels can fit perfectly into the lateral sole of the adjacent panel. Thus, and when the heights h and h 'are adapted as indicated above, the two upper central areas of the two panels are at the same height. The profiled panel has a useful width which is generally between 650 mm and 800 mm, a height h of between 200mm and 220 mm, and it can have a length which can exceed 5.7 m and even reach 6.2 m, from so as to allow formwork having a span of approximately 6 m. The useful width corresponds to the module or to the pitch of the self-supporting formwork and corresponds to the distance I separating the axes of two adjacent panels or, which amounts to the same thing, the axes of the two lower flanges of the same panel. In general, the panel is made of galvanized steel and manufactured by profiling a sheet of thickness between 0.9 mm and 1.5 mm. The thickness must be greater than 0.9 mm to ensure sufficient rigidity. The thickness should preferably remain less than 1.5 mm in order to limit the weight of the panels. Indeed, it must be able to be manipulated manually to be implemented, in particular, in multi-storey buildings. The dimensions of the longitudinal stiffeners 4, 4 ′ of the upper central area 1 are preferably such that the opening U sp is between 25 and 45 mm, the width of the bottom Uι p is between 0 and 15 mm, and the height H rp is between 10 and 25 mm. The dimensions of the longitudinal stiffeners 6, 6 'of the webs 2, 2' are such that the width U ra is between 20 and 40 mm, and the height H ra is between 15 and 25 mm. The width of the stiffener of the sole edge b is between 15 and 25 mm. The stiffeners are arranged in such a way that the distance P e between the edge of a longitudinal stiffener 4 or 4 'of the upper central area 1 and the edge of said upper area 1 is between 40 and 60 mm, the distance Pj between the edge of the same stiffener 4 or 4 ′ and the start of the notched range 5 is between 40 and 60 mm. Finally, the distance a s which separates the upper edge of the lateral core 2 or 2 'and the longitudinal stiffener 6 or 6' of the lateral core, is preferably between 40 and 80 mm. Within these ranges, the exact values of the parameters which define the geometry of the profiled panel can be optimized by calculation or by experimentation so as to obtain the panel having the best possible mechanical behavior over the longest length. Thus optimized, the panel provides useful spans of around 6 m. In addition, its profile consists only of simple folds which allow it to be easily made by profiling.

Claims

Revendications claims
1. Panneau profilé pour coffrage à longue portée ayant un profil du type oméga, le panneau profilé comportant : - une plage centrale supérieure (1) horizontale s'étendant dans le sens longitudinal du panneau profilé et comportant deux nervures longitudinales (4, 4') séparées par un crantage transversal (5),1. Profiled panel for long-span formwork having an omega-type profile, the profiled panel comprising: - a horizontal upper central section (1) extending in the longitudinal direction of the profiled panel and comprising two longitudinal ribs (4, 4 ' ) separated by a transverse notch (5),
- deux ailes latérales (2, 2') inclinées prolongeant la plage centrale (1) de chaque côté de la plage centrale, s'étendant vers le dessous et vers l'extérieur de la plage centrale, et comportant chacune au moins un pli raidisseur (6, 6') longitudinal,- two inclined lateral wings (2, 2 ') extending the central area (1) on each side of the central area, extending below and towards the outside of the central area, and each comprising at least one stiffening ply (6, 6 ') longitudinal,
- et deux semelles inférieures (3, 3') horizontales prolongeant latéralement les âmes latérales et s'étendant vers l'extérieur du panneau profilé, caractérisé en ce que : l'au moins un pli raidisseur (6, 6') longitudinal de chaque âme latérale (2, 2') est disposé dans la partie de l'âme latérale (2, 2') destinée à travailler en compression lorsque le panneau profilé est monté sur une structure et recouvert de béton, et la partie destinée à travailler en traction ne comporte pas de pli raidisseur longitudinal. 2. Panneau profilé selon la revendication 1 , caractérisé en ce que la partie d'une âme latérale (2, 2') destinée à travailler en compression est comprise dans la moitié supérieure de ladite âme latérale (2, 2') voisine de la plage centrale supérieure (1), et la partie de ladite âme latérale (2, 2') destinée à travailler en traction comprend au moins la moitié inférieure de ladite âme verticale (2, 2') voisine d'une semelle inférieure. 3. Panneau profilé selon la revendication 1 ou la revendication 2, caractérisé en ce que au moins une âme latérale (2, - And two horizontal lower flanges (3, 3 ') extending laterally the lateral webs and extending towards the outside of the profiled panel, characterized in that: the at least one longitudinal stiffening ply (6, 6') of each lateral core (2, 2 ') is arranged in the part of the lateral core (2, 2') intended to work in compression when the profiled panel is mounted on a structure and covered with concrete, and the part intended to work in traction does not have a longitudinal stiffening fold. 2. Profiled panel according to claim 1, characterized in that the part of a lateral core (2, 2 ') intended to work in compression is included in the upper half of said lateral core (2, 2') close to the upper central area (1), and the part of said lateral core (2, 2 ') intended to work in traction comprises at least the lower half of said vertical core (2, 2') adjacent to a lower sole. 3. Profiled panel according to claim 1 or claim 2, characterized in that at least one lateral core (2,
2') comporte un crantage vertical disposé entre l'au moins un pli raidisseur (6, 6') et la semelle inférieure (3, 2 ′) has a vertical notching disposed between the at least one stiffening ply (6, 6 ′) and the bottom flange (3,
3') correspondante. 3 ') corresponding.
4. Panneau profilé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que au moins une semelle inférieure (3, 3') comporte sur son bord latéral externe un raidisseur de bord. 4. Profiled panel according to any one of claims 1 to 3, characterized in that at least one lower sole (3, 3 ') has on its external lateral edge an edge stiffener.
5. Panneau profilé selon la revendication 4, caractérisé en ce que le raidisseur de bord d'une semelle inférieure (3, 3') est constitué par un bord relevé (9, 9'). 5. Profiled panel according to claim 4, characterized in that the edge stiffener of a lower sole (3, 3 ') is constituted by a raised edge (9, 9').
6. Panneau profilé selon la revendication 4 ou la revendication 5, caractérisé en ce que le fond d'au moins une semelle (3, 3') est plat et ne comporte pas de raidisseur intermédiaire. 6. Profiled panel according to claim 4 or claim 5, characterized in that the bottom of at least one sole (3, 3 ') is flat and does not include an intermediate stiffener.
7. Panneau profilé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'angle α que forme une aile latérale (2, 2') avec un plan parallèle à la plage centrale horizontale (1) est compris entre 74,8° et 79,8°. 7. Profiled panel according to any one of claims 1 to 6, characterized in that the angle α formed by a lateral wing (2, 2 ') with a plane parallel to the horizontal central range (1) is between 74 , 8 ° and 79.8 °.
8. Panneau profilé selon l'une quelconque des revendications 1 à8. Profiled panel according to any one of claims 1 to
9, caractérisé en ce que la largeur Pe de la bande latérale (21 , 21') de la plage centrale horizontale s'étendant entre le bord latéral de la plage centrale9, characterized in that the width P e of the lateral strip (21, 21 ') of the horizontal central area extending between the lateral edge of the central area
(1) et le bord de la nervure longitudinal (4, 4') disposée du côté dudit bord latéral de la plage centrale est supérieur à 8 % de la largeur lpc de la plage centrale. 9. Panneau profilé selon la revendication 8, caractérisé en ce que la largeur lc de la zone crantée (5) de la plage centrale est supérieure à 60 % de la largeur lpc de ladite plage centrale (1). (1) and the edge of the longitudinal rib (4, 4 ') disposed on the side of said lateral edge of the central area is greater than 8% of the width l pc of the central area. 9. profiled panel according to claim 8, characterized in that the width l c of the notched area (5) of the central area is greater than 60% of the width l pc of said central area (1).
10. Panneau profilé selon la revendication 9, caractérisé en ce que la largeur lc de la zone crantée est supérieure à 75 % de la largeur lpc de la plage centrale. 10. Profiled panel according to claim 9, characterized in that the width l c of the notched zone is greater than 75% of the width l pc of the central area.
11. Panneau profilé selon l'une quelconque des revendications 1 à11. Profiled panel according to any one of claims 1 to
10, caractérisé en ce que sa longueur est supérieure à 5,7 m. 10, characterized in that its length is greater than 5.7 m.
12. Panneau profilé selon l'une quelconque des revendications 1 à12. Profiled panel according to any one of claims 1 to
11 , caractérisé en ce qu'il est en acier. 11, characterized in that it is made of steel.
13. Panneau profilé selon la revendication 12, caractérisé en ce qu'il est en acier galvanisé. 13. Profiled panel according to claim 12, characterized in that it is made of galvanized steel.
14. Panneau profilé selon la revendication 11 ou la revendication 12, caractérisé en ce que son épaisseur est comprise entre 0,9 mm et 1 ,5 mm. 14. Profiled panel according to claim 11 or claim 12, characterized in that its thickness is between 0.9 mm and 1.5 mm.
15. Panneau profilé selon l'une quelconque des revendications 1 à 14, caractérisé en ce qu'il est fabriqué par profilage. 15. Profiled panel according to any one of claims 1 to 14, characterized in that it is manufactured by profiling.
16. Coffrage autoportant constitué de panneaux profilés adjacents assemblés par couturage et supportés par des poutres transversales, caractérisé en ce que au moins un panneau profilé est conforme à l'une quelconque des revendications 1 à 15. 16. Self-supporting formwork consisting of adjacent profiled panels assembled by stitching and supported by transverse beams, characterized in that at least one profiled panel conforms to any one of claims 1 to 15.
17. Plancher comportant une dalle en béton coulée sur un coffrage autoportant selon la revendication 16. 17. Floor comprising a concrete slab poured onto a self-supporting formwork according to claim 16.
PCT/FR2004/002587 2003-10-14 2004-10-12 Large-span self-supporting metal formwork WO2005038159A1 (en)

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FR0312000A FR2860814B1 (en) 2003-10-14 2003-10-14 HIGH-RANGE AUTOMOTIVE METAL FORMWORK

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DE102013019497B4 (en) * 2013-11-21 2020-08-06 Kingspan GmbH Roof or ceiling slab designed as a concrete-steel composite construction
DE102017214271A1 (en) * 2017-08-16 2019-02-21 Thyssenkrupp Ag Steel trapezoidal profile and its use
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FR1236603A (en) * 1959-06-11 1960-07-22 Acieroid floor element and its applications
US3653171A (en) * 1969-06-18 1972-04-04 Bethlehem Steel Corp Spiral wire fastener for sheets of material
US4453364A (en) * 1980-05-27 1984-06-12 Ting Raymond M L Corrugated steel decking section
US4741134A (en) * 1984-07-02 1988-05-03 Consolidated Systems, Inc. Composite metal/concrete bar joist floor and method
GB2195680A (en) * 1986-11-27 1988-04-13 Quikspan Construction Limited Corrugated sheet decking with concrete bonding projections
US5056348A (en) * 1989-06-01 1991-10-15 Robertson-Ceco Corporation Method of making a profiled sheet metal building unit
DE4215686C1 (en) * 1992-05-14 1993-11-11 Hoesch Siegerlandwerke Gmbh Connection for steel trapezoidal profiles with under construction - is used for roof or ceiling plates formed as concrete-steel union constructions
DE4414410A1 (en) * 1994-04-26 1995-11-02 Krupp Ag Hoesch Krupp Connection between steel trapeze sections and support structure of roof

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EP1678389A1 (en) 2006-07-12
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EP1678389B1 (en) 2016-06-08
FR2860814B1 (en) 2006-02-24
PL1678389T3 (en) 2016-12-30

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