EP2206855B1 - Form panel for moulding a concrete shell, set of two form panels of this type and method of assembling the form panels - Google Patents

Description

The present invention relates to a molding board for a concrete veil, of the type described in the preamble of claim 1.

The invention relates to the field of building construction, more particularly to the shuttering formwork used to mold concrete sails.

Molding bars are known having two blocks or upper members for receiving the clamping rod or for maintaining the spacing, and two blocks or lower members for receiving a clamping rod or for maintaining the spacing, arranged in four corners of a rectangle.

The panels are also provided, for the purpose of an assembly of several panels one above the other, two blocks or median receiving members of clamping rod or maintaining the spacing located in a middle part, between the upper part and the lower part. Each medial block or organ is aligned vertically with one of the lower blocks or bodies and one of the upper blocks or bodies.

When assembling the panels facing each other, the latter are provided with four clamping rods to maintain the spacing between opposite banks, especially during the pouring of concrete.

When the panels are located at the top of an assembly of several panels, the clamping rods are arranged in the two lower blocks and in the two upper blocks. When the flanks are lower flanks, that is to say, surmounted by upper flaps, the four clamps are arranged in the two middle blocks and in the two lower blocks.

In particular, a banche of the aforementioned type is known ( US-A-2002 / 121,586 ), which has as many upper stems as there are lower stems.

As a result, the assembly of banches is relatively long.

An object of the invention is to provide a casting molding of a concrete veil quickly assembled with an opposite side.

To this end, the invention relates to a banche of the aforementioned type, characterized by the characterizing part of claim 1.

Particular embodiments are described in claims 2 to 5.

The subject of the invention is also an assembly of at least two moldings for molding a concrete web, the two panels being suitable for being assembled facing one another, the assembly comprising holding rods of the spacing between the two panels, characterized in that the two panels are according to any one of claims 1 to 5, and in that the spacing holding rods are adapted to be received in the receiving members opposing superiors and in opposite lower receiving organs of the two banches.

The subject of the invention is also a method of assembling a plurality of moldings of a concrete veil, of the type comprising a step of placing two banks opposite one another, and a step of inserting a spacer rod on the two panels to maintain a spacing between the two panels, characterized in that the panels are according to any one of claims 1 to 5, and in that the number of spacing holding rods for maintaining the spacing between at least one pair of opposing fascias is limited to three.

According to particular embodiments, the method according to the invention comprises one or more of the features of claims 8 and 9.

• la Figure 1 est une vue de face d'une banche de moulage d'un voile en béton, selon l'invention ;
• la Figure 2 est une vue latérale d'un ensemble de deux banches formé par la banche de la Figure 1 assemblée avec une banche identique opposée ;
• la Figure 3 est une vue plus détaillée d'une tige de serrage supérieure reçue dans un bloc supérieur de réception de chaque banche de la Figure 2 ;
• la Figure 4 est une vue agrandie simplifiée d'un bloc supérieur en position escamotée vers l'arrière pour permettre l'assemblage de la banche avec une banche supérieure ;
• la Figure 5 est une vue analogue à la Figure 3 illustrant une tige de serrage inférieure reçue dans un bloc inférieur de réception de chaque banche de la Figure 2 ;
• la Figure 6 est une vue analogue à la Figure 1 d'un ensemble de deux banches identiques à la banche de la Figure 1 et assemblées l'une au-dessus de l'autre ; et
• la Figure 7 est une vue analogue à la Figure 2 des deux banches de la Figure 6 assemblées à deux autres banches opposées.

The invention will be better understood on reading the description which follows, given solely by way of example, and with reference to the appended drawings, in which:

• the Figure 1 is a front view of a casting mold of a concrete veil, according to the invention;
• the Figure 2 is a side view of a set of two ribs formed by the banche of the Figure 1 assembled with an identical opposite side;
• the Figure 3 is a more detailed view of an upper clamping rod received in an upper receiving block of each section of the Figure 2 ;
• the Figure 4 is a simplified enlarged view of an upper block in retracted position to allow the assembly of the box with an upper panel;
• the Figure 5 is a view similar to the Figure 3 illustrating a lower clamping rod received in a lower receiving block of each section of the Figure 2 ;
• the Figure 6 is a view similar to the Figure 1 a set of two sides identical to the banche of the Figure 1 and assembled one above the other; and
• the Figure 7 is a view similar to the Figure 2 of the two banches of the Figure 6 assembled with two other opposite banks.

The Figure 1 illustrates a molding 2 molding a concrete veil. The board 2 is intended to be assembled with an identical opposite side 2A ( Figure 2 ). The two panels 2 and 2A thus assembled form a mold of a concrete veil.

The panel 2 comprises a formwork body 4. The panel 2 is further provided, in a conventional manner, with a working platform 6 held by one or more collapsible braces 8 for ground support (see FIG. Figure 2 , not shown on the Figure 1 ).

The formwork body is provided with three lifting shackles 9.

The formwork body 4 has a rectangular parallelepipedal general shape. It defines a form surface 10 having a lower edge 12, an upper edge 14 and two side edges 16 joining the lower and upper edges 12, 14 at their ends. The form surface 10 is flat and rectangular in outline.

Throughout the description, the lower and upper edges 12, 14 constitute a reference of horizontality, while the lateral edges 16 constitute a reference of verticality.

The formwork body 4 further comprises on a rear face a plurality of vertical stiffeners 18, as well as fastening elements 20 to another branch located above, below, or next to the panel 2. The body formwork is also provided with two foot cylinders 21 able to enhance the formwork body 4 relative to the ground.

The shuttering body 4 of the panel 2 is divided into an upper part 24, a lower part 26, and a middle part 28 extending between the upper part 24 and the lower part 26.

To assemble the panels 2 opposite one another and at the same level, as illustrated on the Figure 2 , the shuttering body 4 of each panel 2 is provided with an upper block 32 for receiving the clamping rod for clamping the panels 2 and 2A towards each other, two middle blocks 34 for receiving the clamping rod , and two lower blocks 36 receiving clamping rod. The upper block 32 is located in the upper part 24, the two middle blocks 34 in the middle part 28 and the two lower blocks 36 in the lower part 26.

In addition, the formwork body 4 comprises a horizontal stiffener 38 located in the upper part 24 of the panel 2.

As illustrated by Figures 2 and 3 , maintaining the spacing between opposite banks 2 and 2A is ensured by the establishment of clamping rods 40 in some of the blocks 32, 34, 36.

The lower blocks 36 are spaced apart in the horizontal direction X-X parallel to the edge 12. They are at the same level. The lower blocks 36 are thus aligned in the horizontal direction X-X.

The lower blocks 36 are arranged symmetrically with respect to a median vertical plane P of the shuttering body 4 of the panel 2 perpendicular to the surface 10 ( Figure 1 ).

The upper block 32 is spaced, in a vertical direction, from the two lower blocks 36.

The upper block 32 is located, in the horizontal direction, strictly between the two lower blocks 36 adjacent. Preferably, the upper block 32 is spaced, in the horizontal direction, from each lower block 36 by at least 20% of the horizontal distance between the two lower blocks 36, preferably by at least 30%, more preferably by at least 40%, more preferably 50%. In the preferred example illustrated, the upper block 32 forms the main vertex of an isosceles triangle whose base is formed by the two lower blocks 36.

The upper block 32 is centered on the median vertical plane P.

The medial blocks 34 are aligned in the horizontal direction XX.

The two middle blocks 34 and the two lower blocks 36 are arranged at the four corners of a rectangle. The rectangle is vertical and centered, relative to the body 4, in the horizontal direction X-X.

The form body 4 has a height h , measured in the vertical direction, for example between 2.50m and 3.20m, and a width l , measured in the horizontal direction for example between 2m and 3m.

The distance measured in a vertical direction YY between each median block 34 and each of the lower blocks 36 is for example substantially between 50% and 75% of the height h of the formwork body 4.

The distance measured in the vertical direction YY between each lower block 36 and the upper block 32 is between, for example, 0.8 and 1 times the height h .

The distance measured in the horizontal direction XX between the two lower blocks 36 is for example equal to half the width l .

In the example shown on the Figure 2 , the formwork assembly formed by the panels 2 and 2A is a single stage, and only three clamping rods 40 are used. A same upper clamping rod 40 is received in the two opposite upper blocks 32 of the two panels 2 and 2A, while two lower clamping rods 40 are each arranged in a respective pair of opposite lower blocks 36 of the panels 2 and 2A, as shown in FIG. illustrate the three gray circles of the Figure 1 .

The clamping rods 40 are of any suitable type.

The Figure 3 illustrates more precisely the upper rod 40 received in the upper block 32 of each of the two panels 2 and 2A, and the horizontal stiffener 38 of each panel 2, 2A.

The rod 40 is a screw comprising a threaded portion 42 and an operating head 44 forming a support collar 46.

The upper blocks 32 are identical. They nevertheless have two distinct configurations, namely a sliding pivot connection configuration with the rod 40, and a connection configuration screwed with the rod 40.

For this purpose, each block 32 comprises a nut 50 movably mounted in a cage 52 between a disengaged high position (right block on the Figure 3 ), and an lower position of receiving the rod 40 in the nut 50 (left block on the Figure 3 ).

The nut 50 is enclosed inside the cage 52. It comprises a hook 54 adapted to bear on the top of the cage 52 to hook the nut 50 in its high position. In the low position, the nut 50 is supported on the bottom of the cage 52.

The nut 50 has an internal thread complementary to the thread of the threaded portion 42 of the rod 40.

When the nut 50 is in its high position, the clamping rod 40 is received through the block 32, under the nut 50. It is thus received in the block 32 free to rotate about its axis A and free in translation along its axis A. Block 32 is in the sliding pivot connection configuration. The bearing flange 46 forms a bearing abutment on the block 32 and blocks the translation of the rod 42 along its axis A relative to the corresponding block 32, to the opposite block 32.

In the opposite receiving block 32, the nut 50 is in its low position and the clamping rod 40 is screwed through the nut 50. The opposite block 32 is in the screw connection configuration.

When the rod 40 is received in the two opposite blocks 32, the rotation of the rod 40 about its axis A in the direction of screwing, brings the docks 2 and 2A closer to each other. The rotation in the direction of unscrewing allows to separate the panels 2, 2A from one another.

The upper block 32 is further mounted to tilt between the active position of the figures 2 and 3 and a retracted position towards the rear ( Figure 4 ). The retracted position frees the space needed for the upper sideboard to assemble with the sideboard 2.

The medial blocks 34 and the lower blocks 36 are of any known type, each having, for example, also a sliding pivot connection configuration and a screw connection configuration.

The Figure 5 illustrates more particularly the lower blocks 36, which are identical to the middle blocks 34.

On the right side 2, the nut 50 is in its high position, the rod 40 is pivotally and slidably received along its axis in the block 36.

On the left side 2A, the nut 50 is in its low position. The rod 40 is screwed into the nut 50.

The rod 40 is for example provided with a tightening nut 51 screwed onto the rod 40. The nut 51 has a bearing flange 52 on the block 36. The nut 51 has the advantage of ensuring rapid clamping by turning the nut 51 rather than the head 44 of the rod 40.

The desired spacing between the two panels 2 and 2A is obtained by screwing the rods 40. The screwing of the rods 40 squeezes the opposite banks 2 and 2A towards one another. The unscrewing of the rods 40 allows them to move away from one another.

The horizontal stiffener 38 will now be described in more detail with regard to the figure 3 .

The horizontal stiffener 38 is disposed at the level of the upper block 32. As shown in FIG. figure 3 , the upper block 32 is integral with the stiffener 38, itself secured to the form surface 10. The stiffener 38 is for example welded to the form surface 10. The block 32 is for example stuck on the stiffener 38.

The stiffener 38 has several plies 39 of bending reinforcement around a vertical axis, namely three horizontal plies 39 forming a 90 ° angle. The horizontal stiffener 38 thus has, in vertical section, a stepped shape.

In addition, the stiffener 38 is made of a material more rigid than the material of the form surface 10 and / or in a material more rigid than the material of the vertical stiffeners 18.

The stiffener 38 is for example made in a high yield strength steel while the form surface 10 and the vertical stiffeners 18 are made of a mild steel. Alternatively, the form surface 10 and / or the vertical stiffeners 18 are also made of a high yield strength steel.

Finally, two of the vertical stiffeners 18 are disposed on either side of the block 32, in the immediate vicinity of the block 32.

The vertical stiffeners 18 are integral with the form surface 10. They are for example welded to the form surface 10. They extend over substantially the entire height of the form surface 10.

The vertical stiffeners 18 are integral with the horizontal stiffener 38. They are for example welded to the horizontal stiffener 38.

The vertical stiffeners 18 reinforce the shuttering body 4 at the upper block 32 in bending around a horizontal axis extending in the formwork plane.

The Figures 6 and 7 illustrate a set of two boards 2B and 2C assembled one above the other by means of the fastening elements 20.

The assembly thus comprises an upper panel 2B and a lower panel 2C.

The clamping rods 40 of the upper boards 2B are arranged in the same way as on the Figures 1 and 2 , namely a clamping rod 40 in the opposite upper blocks 32 and two clamping rods 40 each in a respective pair of opposite lower blocks 36 (on the Figure 6 , the gray circles symbolize the location of each clamping rod 40).

On the other hand, the bottom panels 2C are provided with four clamping rods 40, two of which are each received in a respective pair of opposite medial blocks 34 and two are each received in a respective pair of opposed lower blocks 36.

The upper block 32 of each lower branch 2C is, in the example shown, retracted in its rearward pivoted position to allow the support of the upper formwork 2B and the associated lower branch 2C.

The assembly method according to the invention will now be described.

In the case of a set of 2 single-level banches 2 and 2A are placed opposite one another. Spacers, provided to ensure a minimum spacing, are fixed, for example magnetically, on one and / or the other formwork surfaces 10 of the panels 2 and 2A.

The upper clamping rod 40 is inserted into the respective upper blocks 32 of the two panels 2, 2A, and the two lower rods 40 are inserted into the lower blocks 36.

Then, the rods 40 are screwed to bring the panels 2 and 2A towards each other, until the selected spacing is obtained between the two facing surfaces 10 opposite.

A subsequent step is to pour a liquid concrete between the two panels 2 and 2A, and this over substantially the entire height h . The concrete generates a pressure tending to separate the panels 2 and 2A from one another. The rods 40 maintain the selected spacing against the force exerted by the pressure of the concrete.

In the case of a formwork made with several layers of 2B, 2C, banisters arranged one above the other, as illustrated on the Figures 6 and 7 once the boards 2B and 2C are assembled together, the two sets are arranged facing each other. Three clamping rods 40 are arranged in a triangle through the two upper boards 2B, while four clamping rods 40 are arranged in a rectangle through the lower boards 2C.

With the invention, the number of clamping rods 40 used is reduced, and thus the time required for assembling the panels.

The arrangement of the upper block 32 between the two lower blocks 36 allows this reduction in the number of clamping rods 40 while minimizing the mechanical bending forces on the panels 2.

The isosceles triangle arrangement optimizes the distribution of the forces exerted on the panel 2 at the level of the clamping rods 40.

The horizontal stiffener 38 provides a good distribution of forces in the upper part 24 of the panel 2. It provides the reinforcement of the panel 2 in bending around a vertical direction.

The suitable choice of the material of the horizontal stiffener 38 confers on panel 2 the bending strength required at the single upper block 32 for receiving the clamping rod.

The boards are not necessarily all identical: alternatively, the boards may be compatible but not identical.

Claims (9)

1. Form panel (2) for moulding a concrete shell, of the type comprising a formwork body (4) having a lower part (26) and an upper part (24), the lower part (26) comprising two lower means (36) for receiving a spacer rod (40) for maintaining the spacing between the form panel (2) and an opposing form panel (2A), the lower receiving means (36) being spaced apart in a horizontal direction (X-X), the upper part (24) comprising upper means (32) for receiving a spacer rod (40) between the form panel (2) and the opposing form panel (2A), the upper receiving means (32) being located, in the horizontal direction (X-X), strictly between the two lower receiving means (36), characterised in that the form panel (2) has only one upper receiving means (32).
2. Form panel (2) according to claim 1, wherein the upper receiving means (32) and the lower receiving means (36) are each arranged at a corner of an isosceles triangle, the upper receiving means (32) forming the main apex of the isosceles triangle and the lower receiving means (36) forming the base of the isosceles triangle.
3. Form panel (2) according to claim 1 or 2, wherein the form panel (2) has precisely two lower receiving means (36).
4. Form panel (2) according to any one of the preceding claims, wherein the formwork body (4) comprises a median part (28), between the upper part (24) and the lower part (26), the median part (28) comprising two median means (34) for receiving the spacer rod (40), the median receiving means (34) and the lower receiving means (32) preferably each being arranged at a corner of a rectangle.
5. Form panel (2) according to any one of the preceding claims, wherein the form panel (2) comprises a horizontal reinforcement (38) arranged level with the upper receiving means (32).
6. Set of at least two form panels (2) for moulding a concrete shell, the two form panels (2, 2A, 2B, 2C) being adapted to be assembled facing one another, the set comprising spacer rods (40) for maintaining the spacing between the two form panels (2, 2A, 2B, 2C), characterised in that the two form panels (2, 2A, 2B, 2C) are as claimed in any one of the preceding claims, and in that the spacer rods (40) are adapted to be received in the opposing upper receiving means (32) and in the opposing lower receiving means (36) of the two form panels (2, 2A, 2B, 2C).
7. Method of assembling a plurality of form panels for moulding a concrete shell, of the type comprising a step of positioning two form panels (2, 2A, 2B, 2C) facing one another and a step of inserting a spacer rod (40) on the two form panels (2, 2A, 2B, 2C) in order to maintain a spacing between the two form panels (2, 2A, 2B, 2C), characterised in that the form panels (2, 2A, 2B, 2C) are as claimed in any one of claims 1 to 5, and in that the number of spacer rods (40) for maintaining the spacing between at least one pair of opposing form panels (2, 2A, 2B, 2C) is limited to three.
8. Method according to claim 7, wherein the method comprises a subsequent step of pouring concrete between the two opposing form panels (2, 2A, 2B, 2C) held by the three spacer rods (40) over substantially the entire height (h) of the formwork body (4) of the form panels (2, 2A, 2B, 2C).
9. Method according to claim 7 or 8, wherein a plurality of form panels (2, 2A, 2B, 2C) are assembled in a vertical arrangement above one another, the upper form panels (2B) located at the top being provided with only three spacer rods (40) for two opposing form panels (2B), the other form panels (2C) preferably being provided with at least four spacer rods (40) for two opposing form panels (2C).

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