EP1234929A1 - Modular support structure of a shuttering for a slab or similar - Google Patents

Abstract

The structure comprises a frame which is supported by struts and is composed of primary beams (1) which support secondary beams. The primary beams comprise a base cavity (2) with concave curved side walls (3). In its upper part are side reception troughs (10) for secondary beam hooking parts. A median cavity (4) which forms a tie piece between the upper cavity (7) and the base cavity is widened toward the base cavity. The secondary beams are also honeycombed and comprises dihedral shaped honeycomb support ends.

Description

Technical field of the invention

The invention is in the field of construction, and more particularly techniques for constructing concrete slabs or the like. Its purpose a modular structure supporting a formwork for the manufacture of a such a slab.

State of the art

We know in the field of construction a method for manufacturing a slab, which implements a modular structure of temporary support of formwork plates for receiving concrete, until hardened latest. More particularly, these structures are composed of elements modules assembled together in a generally planar mesh structure, which is supported by props. The framework is composed of a set of primary beams supporting two by two secondary beams. The primary beams are connected to each other by abutment of a on the one hand, and transversely on the other. This connection is made, at least for some of them, through formwork heads supported by were.

The problem to be solved for this type of frame lies in the compromise to find between a satisfactory resistance of the beams to bending, and a lightness necessary for their maneuverability. Note also that this compromise must take into account the factors for obtaining the component elements the framework at the lowest possible manufacturing cost. Finally, it is necessary that the structure offers reliability, robustness and durability such that its implementation does not imply a prohibitive additional cost compared to a slab obtained according to a traditional method.

This is why, the designers of this type of frame focus their efforts on a design of primary and secondary beams obtained from of light metal, aluminum or similar profiles in particular. More in particular, the designers' intuitive approach focuses on obtaining such frameworks, both in their overall arrangement and in the respective arrangement of the various elements that compose them, taken at the both themselves in their entirety and in their different parts.

• une alvéole de base évasée vers le haut, pour offrir une résistance à l'encontre du poids de la dalle. Cette alvéole de base est dotée en bordure de sa partie supérieure de goulottes latérales de réception d'un organe de crochetage des poutres secondaires, en vue de leur soutien. Ces goulottes sont délimitées entre un prolongement des parois latérales de l'alvéole de base, et les parois latérales correspondantes d'une alvéole médiane. On notera que de manière habituelle, l'alvéole de base est entretoisée pour son renfort.
• une alvéole supérieure de réception d'une planche de bois par affleurement, pour offrir une surface satisfaisante pour le clouage et de repos du coffrage.
• l'alvéole médiane, qui forme une entretoise entre l'alvéole supérieure et l'alvéole de base. Plus particulièrement, l'alvéole médiane ménage entre l'alvéole supérieure et les goulottes, un espace qui correspond sensiblement à l'épaisseur des poutres secondaires. On comprendra que l'alvéole médiane vise à faire affleurer ensemble dans un même plan les sommets des poutres primaires et secondaires.

The primary beams are honeycombed to give them their robustness with the smallest possible mass. We can thus distinguish for these beams at least three superimposed cells of specific conformation to their function:

• a base cell flared upwards, to offer resistance against the weight of the slab. This basic cell is provided at the edge of its upper part with lateral troughs for receiving a hooking member for the secondary beams, with a view to supporting them. These troughs are delimited between an extension of the side walls of the base cell, and the corresponding side walls of a middle cell. It will be noted that, in the usual way, the basic cell is braced for its reinforcement.
• an upper recess for receiving a wooden board by flush, to provide a satisfactory surface for nailing and resting the formwork.
• the middle cell, which forms a spacer between the upper cell and the base cell. More particularly, the middle cell spans between the upper cell and the troughs, a space which corresponds substantially to the thickness of the secondary beams. It will be understood that the middle cell aims to bring the vertices of the primary and secondary beams to be flush together in the same plane.

The documents EP 751 268 and DE 3921064 relate to a device for modular support for formwork of concrete slabs, with beams primary each comprising a base trapezoidal cell, and a middle cell with straight side walls and extending perpendicular to the partition wall. Mechanical resistance to bending of such a profile remains limited.

The formwork heads have a plate to support the beams primary and assemble them together. This support is done either directly, either via cooperating hooking members respectively assigned to beams and formwork heads. For example, this picking is obtained by means of notches formed in the profile, which cooperate with a protruding rim of the plate of the formwork heads.

As for the secondary beams, they are formed in a simple profile, such than I or square. In the case of an I conformation, allowing obtaining light secondary beams in themselves, the surface of formwork rest is optimized thanks to an upper alveolus top of I, for the reception of a wooden board like beams primary.

In the case of a conformation of the square profile, which offers a surface of satisfactory rest for the formwork, the lightening of the secondary beams is obtained by openings in the walls of the profile.

Honeycomb tips comprising the hooking members are attached at the ends of the profiles for their connection with each other and / or with the formwork. These end pieces therefore comprise the hooking member for the support of secondary beams by primary beams.

Subject of the invention

The object of the invention is to increase the mechanical strength of a modular support structure for a slab formwork.

The primary beams each have a base cell, the side walls are curved in a convex shape, while the middle alveolus is flared towards its seat on an upper wall of the base cell, so as to give the primary beams, in their basic and middle alveolar components taken together, one conformation with double superimposed and flared cells, open in direction one over the other.

• l'alvéole supérieure des poutres primaires comporte sur ses faces internes des organes d'emboítement de la planche qu'elle est destinée à recevoir ;
• les bords de l'alvéole supérieure des poutres primaires comportent des retours vers l'extérieur, qui sont sensiblement en surplomb des goulottes latérales bordant l'alvéole médiane de manière à délimiter conjointement avec cette dernière une zone d'emboítement pour un élément de compensation en bois conformé en correspondance, la face inférieure des retours comportant une gorge pour la réception d'un organe d'emboítement coopérant ménagé sur l'élément de compensation ;
• les poutres primaires comportent à leur base un renfort alvéolé et ouvert, pour constituer un organe de réception d'éléments d'accrochage, les parois latérales de ce renfort comportant des retours en vue de faciliter la préhension des poutres primaires par un utilisateur ;
• les poutres secondaires comportent au moins deux alvéoles superposées, ayant une alvéole de base comportant un profil au moins partiellement de conformation évasée vers le haut,
• une alvéole supérieure de conformation parallélépipédique, qui est ouverte sur l'extérieur pour la réception d'une planche, et qui comporte des rebords de rigidification le long de ses bords latéraux extérieurs.

Other features can be used individually or in combination:

• the upper cell of the primary beams has on its internal faces interlocking members of the board it is intended to receive;
• the edges of the upper cell of the primary beams have outward returns, which are substantially overhanging the lateral troughs bordering the central cell so as to delimit jointly with the latter a nesting zone for a compensation element in wood shaped correspondingly, the underside of the returns comprising a groove for the reception of a cooperating socket member formed on the compensation element;
• the primary beams have at their base a cellular and open reinforcement, to constitute a member for receiving hooking elements, the side walls of this reinforcement comprising returns in order to facilitate the gripping of the primary beams by a user;
• the secondary beams comprise at least two superimposed cells, having a base cell comprising an at least partially profile of conformation flared upwards,
• an upper cell of parallelepipedal conformation, which is open to the outside for the reception of a board, and which has stiffening edges along its outer lateral edges.

Brief description of the drawings

les fig.1 et fig.2 sont des vues illustrant respectivement le profil d'une poutre primaire et celui d'une poutre secondaire,

les fig.3 et fig.4 sont des vues latérales illustrant l'assemblage entre des poutres primaires et secondaires, respectivement par liaison directe et au moyen d'une tête de coffrage,

la fig.5 est une vue partielle en perspective d'une structure de l'invention assemblée,

la fig.6 est une vue en coupe d'un embout équipant les poutres secondaires,

les fig.7 et fig.8 sont des vues en coupe d'embouts équipant les poutres primaires, respectivement en vue de côté et en vue de dessus.

The present invention will be described in relation to the figures of the appended plates, which illustrate preferred embodiments of the elements making up a structure of the invention, in which:

fig.1 and fig.2 are views respectively illustrating the profile of a primary beam and that of a secondary beam,

fig.3 and fig.4 are side views illustrating the assembly between primary and secondary beams, respectively by direct connection and by means of a formwork head,

fig.5 is a partial perspective view of a structure of the assembled invention,

Fig.6 is a sectional view of a tip fitted to the secondary beams,

Fig.7 and Fig.8 are sectional views of end caps fitted to the primary beams, respectively in side view and in top view.

Description of a preferred embodiment

Referring to fig. 1, and according to a first aspect of the invention which relates to primary beams 1, these have the characteristics following, taken alone or in combination:

The basic cell 2 of the primary beams 1 has side walls 3 curved, particularly convex in shape, so that its profile is substantially shaped into at least one circular or curvilinear segment. It follows that the stiffening of the base cell 2 is directly obtained satisfactorily by this conformation, allowing in particular to avoid an inappropriate internal partitioning thereof. We will understand however, although not advantageously, that the base cell 2 perhaps incidentally compartmentalized, especially in the case where the stiffening of primary beams 1 is not supported by an arrangement particular of the medial alveolus 4 in the manner defined below. The radius of curvature of the wall 3 can be variable depending on the desired inertia.

The middle cell 4 of the primary beams 1 has a flared conformation towards its seat on an upper wall 5 of the base cell 2, with side walls 6 which can be straight or curved. These provisions are such that, in addition to the usual spacer function of the middle alveolus 4, this part of the overall stiffening of the primary beam 1, in combination in particular with the curved shape of the side walls 3 of the base socket 2.

We will therefore note a characteristic of the overall conformation of the beams primary 1, in their basic alveolar 2 and median 4 components taken together, which resides in a structure with double cells 2,4 superimposed which are flared, with side walls 3.5 straight or curved, in being open towards each other.

The upper cell 7 of the primary beams 1 has on its faces of the interlocking members 8, such as shaped claw or bead, of the board which it is intended to receive by introduction into strength.

In addition, the edges of the upper cell 7 of the primary beams 1 each have a return 9 to the outside. First of all, note that this return 9 participates in the inertia of the beam. In addition, these returns 9 are substantially overhanging the side troughs 10 bordering the cell median 4, so as to delimit jointly with the latter a nesting zone 11 for a wooden compensation element 12 conformed in correspondence. The function of element 12 is to allow an additional support zone to the concrete reception surface, all by improving the nailing of the covering.

The underside of the returns 9 advantageously has a groove 13 for the reception of a cooperating socket member 14, arranged on the compensating element 12.

Finally, the primary beams 1 have at their base a reinforcement 15 whose mass participates in the inertia of the beam. This reinforcement 15 is shaped into a cell open to further constitute an element receiving body hooking. Note also that the side walls of this reinforcement have returns 16 to the outside in order to facilitate gripping primary beams by a user, and more particularly to facilitate their transport and handling on site by the latter.

Referring to fig.2, and according to a second aspect of the invention which relates to the secondary beams 17, these comprise the following characteristics, taken alone or in combination:

The secondary beams 17 are dimpled, and in particular comprise at minus two superimposed cells 18 and 19.

The base cell 18, has straight or curved side walls 20 in the manner of the basic cell 2 of the primary beams 1. This cell of base 18 advantageously comprises at least one conformation profile partially flared up. The side walls 20 which delimit the flare are optionally extended by walls 21 substantially vertical to an upper cell 19. This profile gives the beams secondary 17 stiffness correlated with the structure of the beams primary 1 such that the overall rigidity of the framework in its plane global characteristics of inertia, and therefore of resistance, which are homogeneous for a number of required secondary beams less than that of the frames of the prior art.

Preferably, the side walls 20 of the base cell 18 are joined by a stiffening rib 22 delimiting the flare at their zone median.

Preferably, the base cell 18 has at its bottom wings of stiffening 23 which also forms a support for an end piece 24.

The upper cell 19 is open to the outside for the reception of a plank like primary beams 1. This upper cell 19 is parallelepiped, and advantageously has flanges 25 of stiffening along its outer side edges.

The secondary beams 17 have on their external lateral faces reliefs 26, in particular streaks, to facilitate their gripping and their manipulation on site by a user.

Referring to fig. 6 and fig. 7, and if necessary to fig. 3 to fig. 5, another aspect of the invention relates to the end caps 24 and 27 of the beams. These are divided into two types respectively assigned to secondary beams 17 and primary beams 1.

• une aile droite 28 d'appui pour leur fixation en bout des poutres secondaires 17, d'une hauteur de l'ordre de celle de ces dernières. On relèvera que selon la forme préférée de réalisation susvisée des poutres secondaires 17, cette aile 28 prend avantageusement appui à sa base contre les ailes d'appui correspondantes 23 de celles-ci 17.
• un organe de suspension 29 comportant à sa base l'organe de crochetage 30 susvisé des poutres secondaires 17. On comprendra que cet organe de crochetage 30 est coopérant, tant avec la goulotte 10 des poutres primaires 1 (fig.3), qu'avec l'organe en saillie 31 des platines 32 des têtes de coffrages 33 (fig.4). Le profil de cet organe de suspension 29 est avantageusement conformé en dièdre, dont la face supérieure est prévue pour affleurer celle des poutres secondaires 17 et dont les parois latérales extérieures 34 forment les parois du dièdre. L'embout 24 étant de préférence alvéolé, la pointe du dièdre correspond à une zone de séparation des alvéoles 35 et 36 qui le composent.

For the ends 24 of a first type (fig. 6), assigned to the secondary beams 17, these comprise

• a straight wing 28 for supporting them at the end of the secondary beams 17, with a height of the order of that of the latter. It will be noted that, according to the preferred embodiment mentioned above of the secondary beams 17, this wing 28 advantageously bears at its base against the corresponding support wings 23 thereof 17.
• a suspension member 29 comprising at its base the hooking member 30 mentioned above of the secondary beams 17. It will be understood that this hooking member 30 is cooperating, both with the chute 10 of the primary beams 1 (fig.3), with the projecting member 31 of the plates 32 of the formwork heads 33 (FIG. 4). The profile of this suspension member 29 is advantageously shaped as a dihedral, the upper face of which is provided to be flush with that of the secondary beams 17 and the outer lateral walls 34 of which form the walls of the dihedral. The end piece 24 is preferably honeycombed, the tip of the dihedron corresponds to a zone of separation of the cells 35 and 36 which compose it.

In general, the point of the dihedral rests against the support wing 28 of the end piece 24 on the secondary beams 17. This support is taken either directly, either through a partition 37, depending on the relationship between the width and height of the suspension member 29 and according to the angle formed by the walls of the dihedral, the latter preferably being of the order of 120 °.

For end caps 27 of a second type (fig. 7 and fig. 8), assigned to the beams primary 1, these have a generally U-shaped profile with edges returned 38, the latter being provided to bear against the primary beams 1. The wings 39 of the U have at their base notches 40 for the passage of a cooperating hooking member. We will understand that like the end pieces 24 of the secondary beams 17, the notches 40 are cooperating with both the chute 10 of the beams primary1 (fig.3), with the projecting member 31 of the plates 32 of the formwork 33 (fig. 4).

Referring to fig. 4, another aspect of the invention relates to the heads of formwork 33. These are preferably each secured to a forestay 41 to facilitate the installation of the structure. These formwork heads 33 comprise a plate 32 movable along the forestay 41 on which it is threaded, and a member 42 for compressing the plate 32. This last 32 has flanges 31 forming the hooking members cooperating with those corresponding 30.40 from any of primary beams 1 and secondary beams 17. The member 42 for setting compression of the plate 32 is shaped like a ramp cross, which takes support on a support member 43 which includes cooperating ramps, secured to the forestay 41.

Claims (10)

Modular structure supporting a formwork for the manufacture of a concrete slab or the like, of the kind of structure composed of modular elements assembled together in a generally planar mesh structure, which is supported by props,
the frame itself being composed of a set of primary beams (1) supporting two by two of the secondary beams (17), the primary (1) and secondary (17) beams being formed from light metal profiles,
the primary beams (1) being connected to each other by abutment on the one hand, and transversely on the other hand, via, at least for some of them, formwork heads (33) supported by the was (41), the primary beams (1) being honeycombed and comprising at least three superimposed cells, of which: a base cell (2) flared upwards, provided at the edge of its upper part with lateral troughs (10) for receiving a hooking member (30) of the secondary beams (17), an upper cell (7) for receiving a wooden board by flush, and a middle cell (4) which forms a spacer between the upper cell (7) and the base cell (2),
the secondary beams (17) comprising an upper cell (19) for receiving a wooden board, end pieces (24) comprising the hooking member (30) for their support by the primary beams (1), being attached at their ends, characterized in that the primary beams (1) each have a base cell (2) whose side walls (3) are curved having a convex shape, while the middle cell (4) is flared towards its seat on a upper wall (5) of the basic cell (2), so as to give the primary beams (1), in their basic cellular components (2) and median (4) taken together, a configuration with double superimposed cells and flared, open towards each other. Modular structure according to claim 1, characterized: in that the upper cell (7) of the primary beams (1) has on its internal faces members (8) for fitting the board that it is intended to receive. Modular structure according to any one of the preceding claims, characterized: in that the edges of the upper cell (7) of the primary beams (1) have returns (9) to the outside, which are substantially overhanging the lateral chutes (10) bordering the middle cell (4) of so as to delimit jointly with the latter a nesting zone (11) for a wooden compensation element (12) shaped in correspondence, the underside of the returns (9) having a groove (13) for receiving an organ cooperating socket (14) formed on the compensation element (12). Modular structure according to any one of the preceding claims, characterized: in that the primary beams (1) have at their base a reinforcement (15) whose mass participates in the inertia of the beam, this reinforcement (15) being dimpled and open, to further constitute a receiving member of attachment elements, the side walls of this reinforcement (15) comprising returns (16) in order to facilitate the gripping of the primary beams by a user. Modular structure according to any one of the preceding claims, characterized: in that the secondary beams (17) are honeycombed. Modular structure according to claim 5, characterized: in that the secondary beams (17) comprise at least two superimposed cells (18,19): a base cell (18) comprising an at least partially flared upwardly shaped profile, an upper cell (19) of parallelepiped shape, which is open to the outside for receiving a board, and which has stiffening flanges (25) along its outer lateral edges. Modular structure according to claim 6, characterized: in that the base cell (18) of the secondary beams (17) has at its bottom wings (23) of stiffening which also form a support for an end piece (24). Modular structure according to any one of the preceding claims, characterized: in that end pieces (24) of a first type, assigned to the secondary beams (17), comprise: a straight wing (28) for supporting them at the end of the secondary beams (17), a suspension member (29) comprising at its base the hooking member (30) of the secondary beams (17), and having a profile shaped as a dihedral, the point of which bears against the right wing (28) of the end piece on the secondary beams (17). Modular structure according to any one of the preceding claims, characterized: in that end pieces (27) of a second type, assigned to the primary beams (1), comprise a generally U-shaped profile with turned edges (38), the latter (38) being designed to bear against the primary beams (1), the wings (39) of the U comprising at their base notches (40) for the passage of a cooperating member (10,31) for hooking any one of at least one primary beam (1) and a formwork head (33). Modular structure according to any one of the preceding claims, characterized: in that the formwork heads (33) are each secured to a forestay (41), and comprise a plate (32) movable along the forestay (41) on which it is threaded, and a member (42) of compression of the plate (32), the latter (32) having flanges (31) forming the hooking members cooperating with those (40,30) corresponding to any of the primary beams (1) and secondary beams (17), the member (42) for compression being shaped as a railed spider, which bears on a support member (43) with cooperating ramps, integral with the forestay (41).

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