FR3042807A1 - AUTOLESTING FOR FORMWORK BANK - Google Patents

Abstract

The present invention relates to a shuttering formwork (100) for the building comprising: a) a main body (1) having: - a front wall (10) with a formwork front face (10a) and an opposite rear face (10b) - an upper rim wall (11) on which is rigidly fixed a lifting member (12) of the formwork comprising at its end a lifting ring (13) adapted to cooperate with a sling of a crane, and b) a support structure (2) fastened integrally to the rear face (10b) of the front wall (10), said support structure (2) further comprising weighting means (25) serving as a base and having a counterbalancing mass with the mass of said main body (1) so as to ensure the stability of said formwork (100), and the lifting ring (13) being offset relative to the front wall (10) so as to be positioned in line with the center of gravity (G) of said banche (100).

Description

AUTOLESTING FOR BANK DF, FORMWORK

Technical field and prior art

The present invention relates to the field of building and public works.

The present invention relates more specifically to formwork, also called shuttering or shuttering formwork.

The shuttering of formwork are formwork of large dimensions. They are intended to be assembled one above the other and / or next to one another to form large areas of formwork concrete sails.

It is known to use shuttering formwork to obtain a smooth concrete surface.

On the construction sites, the operators have at least two formwork shutters vertically facing each other to pour concrete between them.

Once the concrete has been poured and dried, the formwork must be removed and the shuttering slabs must be moved in order to continue the work.

To achieve such a displacement, the panels conventionally have an upper wall wall on which is fixed a lifting ring. The lifting ring is adapted to receive the sling of a crane to allow the displacement of the shuttering of the formwork one by one on the site.

It is noted here that such a ring is centered relative to the edge wall so as to align vertically with the center of gravity of the form. Such alignment avoids indeed a tilting of the form when lifting thereof.

We also know that a classic form, alone, is not stable; the front wall of the banche offers a real catch in the wind.

To stabilize the form, it is possible to use struts connected to counterweights independent of the form.

However, this is not entirely satisfactory: it is indeed necessary to move the assembly to the crane to transport the formwork then the counterweight, and then reinstall the assembly. The operation is therefore longer.

To ensure the stability of the hips to the wind and facilitate movement of the hips, the Applicant has already proposed in FR 2 538 832 a gantry, also called compass, which connects the two hips vis-à-vis. The use of such a gantry connecting the two hips facing each other increases the stability of the assembly.

The formwork gantries such as those proposed in document FR 2 538 832 also have a lifting ring adapted to receive the sling of a crane in order to move the gantry on the site while keeping in vis-à-vis the hips.

Such a gantry with a lifting ring facilitates stability and movement of the hips on the site.

In practical terms, however, the use of such a portal is not fully satisfactory.

Indeed, it is often preferable before pouring the concrete to introduce reinforcement between the two hips in vis-à-vis.

Such reinforcement mainly consists of an iron lattice generally in the form of more or less thick mesh. The introduction of such a reinforcement between the two hips reinforces the strength of the concrete wall, which is particularly interesting for building construction especially in seismic zones.

For seismic zones, the reinforcement used has such a weight that it is not possible to move it by hand. It is necessary to use a crane to introduce this reinforcement between the two hips.

The Applicant however found on construction sites that the use of a gantry such as that proposed in document FR 2 538 832 does not allow the introduction to the crane reinforcement between the hips.

Object and summary of the present invention

The present invention aims to improve the solution described above.

One of the objectives of the present invention is to overcome the various disadvantages mentioned above by proposing a simple and easy to implement solution for both stabilize the hips on the site in case of wind and move them, while leaving free access to the front face of the front wall, for example to position the crane a reinforcement between two hips vis-à-vis. For this purpose, the object of the present invention relates according to a first aspect a shuttering formwork for the building.

According to the invention, the form includes a main body and a support structure.

Advantageously, the main body has a front wall with a formwork front face and an opposite rear face.

Preferably, the front wall is in the form of a metal form sheet (for example steel) to obtain a smooth concrete surface.

The main body also has an upper edge wall on which is rigidly fixed at least one lifting member of the formwork.

Preferably, the lifting member comprises at its end a lifting ring which is adapted to cooperate with a sling of a crane.

Such a lifting ring is adapted to allow the movement of the banche on a construction site.

It can for example take the form of a hook. Other embodiments may nevertheless be envisaged.

Advantageously, the support structure is fixed integrally (directly or indirectly) to the rear face of the front wall.

According to the invention, the support structure comprises weighting means serving as a base; preferably, the weighting means have a mass capable of counterbalancing when a tilting force is exerted on the front wall during, for example, a gust of wind.

These weighting means, integrated in the structure of banche, thus allow to ensure the stability of the formwork on the ground for example in case of wind towards the front wall (front or rear face).

As indicated above, with a classic form without weighting means, the center of gravity of the form is substantially in the vicinity or in the plane formed by the front wall.

Here, however, the presence of ballasting means inevitably moves the center of gravity of the box towards the rear face of the front wall.

So that the movement of the form with the crane sling is done correctly without the flip flop, it is desirable that the lifting ring is positioned to the right of the center of gravity of the form.

In the context of the present invention, it is therefore provided that the lifting ring is offset to the rear face of the front wall so that the lifting ring is positioned in line with the center of gravity of the formwork. The lifting ring and the center of gravity of the banche are then aligned in the same vertical plane, which limits the pendulum movement of the banche during the movement thereof.

It is therefore understood here that the projection of the point corresponding to the lifting ring on the ground substantially coincides with the projection on the ground of the center of gravity of the form.

Thanks to this combination of technical means, characteristics of the present invention, and in particular thanks to the weighting means conjugated with the remote lifting ring, there is a stable formwork on the floor for the formwork whose movement with the aid of the sling of a crane is done correctly without rocking.

According to optional features of the invention taken alone or in combination: the lifting member has a fixed proximal portion connected to the edge wall and extending along the longitudinal axis of the front wall, and a fixed distal portion; the proximal portion and off-axis from the longitudinal axis to the rear face; the weighting means are monobloc; the weighting means have a first and a second independent weighting block, preferably symmetrical and identical to each other; - The first and second ballast blocks are hinged together in a ball joint connection to adapt to the irregularities of the ground; - The support structure comprises at least two amounts forming a frame and at least two connecting arms, a first end is hingedly attached to the rear face of the main body; - The weighting means have connecting means adapted to cooperate the lower end of each of the amounts so that the amounts are articulated on the weighting means; - The board has a circulation platform connected to the main body by the rear face of the front wall, and the support structure by the upper end of each of the uprights; the proximal portion comprises a first piece fixed integrally to the edge wall and a second piece hinged to the first piece in a pivot connection and secured to the distal portion so as to allow the alignment of the form with the sling of the crane during the lifting of said banche by said crane, said second part being able to pivot relative to the first part along an axis substantially perpendicular to the front wall.

Correlatively, the object of the present invention relates according to a second aspect an equipment for moving a formwork box.

Preferably, this equipment comprises: a crane having a sling, and a formwork slab such as that described above.

The present invention, by combining the weighting means with the presence of a remote lifting ring, ensures both the movement and stability of the dams on a construction site.

By leaving free space at the front face of the front wall, it is also possible to introduce the crane reinforcement between two panels which are vis-à-vis one another.

The present invention, by its different structural and functional technical features, is therefore an alternative to the formwork gantry such as that proposed in the document FR 2 538 832.

Brief description of the appended figures Other features and advantages of the present invention will emerge from the description below, with reference to Figures 1 to 6 attached which illustrate an embodiment having no limiting character and in which: - Figure 1 is a perspective view of a formwork box with one-piece ballasting means according to an exemplary embodiment of the invention; - Figure 2 shows a schematic view according to the example of Figure 1 illustrating the mechanical connection of the weighting means with respectively the amount and the link arm; - Figure 3 shows a side view of a shuttering formwork according to the example of Figure 1; FIG. 4 represents a perspective view of a shuttering box with independent and symmetrical weighting means according to another embodiment of the invention; FIG. 5 represents a schematic view in accordance with the example of FIG. 4 illustrating the mechanical connection of the weighting means with respectively the upright and the connecting arm; Figure 6 shows a schematic view of two hips assembled to each other whose lifting members are actuated.

Detailed description of an advantageous embodiment example

A formwork shuttering according to two advantageous exemplary embodiments will now be described in the following with reference to FIGS. 1 to 6.

For the record, one of the objectives of the present invention is to design a shuttering formwork both stable and easy to move on construction sites.

Another objective of the present invention is to propose an alternative to the formwork gantry, such as that proposed in document FR 2 538 832, to allow the introduction of reinforcement to the crane between the two hips facing each other. before pouring concrete.

The various objectives above are achieved with a shuttering board 100 such as that described below.

In the example described here and as illustrated in Figures 1 and 2, there is a blank 100 in upright use for the formwork for example of a concrete wall.

In this example, the formwork box 100 conventionally comprises a main body 1 comprising a front wall 10, also called formwork sheet, with a formwork front face 10a and a rear face 10b opposite to the front face 10a.

In this example, the form sheet 10, preferably made of steel, has a substantially rectangular shape.

In this example, the main body 1 also comprises an upper rim wall 11 on which is rigidly fixed a lifting member 12.

In this example, the lifting member 12 is positioned substantially in the center of this wall 11.

As illustrated in Figures 1 and 2, the lifting member 12 has at its end a lifting ring 13 in the form of a hook adapted to cooperate with the sling of a crane (not shown here).

We can also provide here a system of sling ground (not shown here).

One of the goals here is to have a stable hip.

In the example described here, the formwork hip 100 further comprises a support structure 2 which is hingedly attached to the rear face 10b of the formwork sheet 10.

In this example illustrated in Figures 1 to 3, the support structure 2 comprises one-piece ballast means 25 serving as a base. The weighting means 25 thus has a lower surface, substantially flat, intended to be in direct contact with the ground.

These weighting means 25 consist at least partially in a heavy material such as for example concrete.

These means 25 and have a sufficient mass to counterbalance and ensure the stability of the box 100 to the ground when the wind exerts a force on the front wall 10 (front or rear face).

The mass of these weighting means 25 necessarily moves the center of gravity of the block 100.

As explained above, the addition of these weighting means 25 moves the center of gravity of the box towards the rear face 10b of the formwork sheet 10.

To avoid a tilting of the board 100 during its lifting (due to this displacement of the center of gravity), it is therefore provided as can be seen in Figure 3 to deport the lifting ring 13 so as to vertically align this ring 13 with the center of gravity of the block 100. For this purpose, in the example described here, the lifting member 12 has a proximal portion 12a which is a longitudinal piece extending along the longitudinal axis A of the front wall 10; this portion 12a is then extended by a distal portion 12b which is a longitudinal piece whose end comprises the ring 13; this distal portion 12b forms with the portion 12a an inclination angle substantially between 10 ° and 40 ° so as to vertically align the ring 13 with the center of gravity of the block 100.

An embodiment may be provided in which the portions 12a and 12b are hinged together so as to adjust this angle of inclination (not shown here).

Alternatively, these portions may also be rigidly secured to one another so as to have a fixed angle (for example substantially equal to 35 °).

In the example described here, the proximal portion 12a is composed of two parts including a first piece 12a 'rigidly connected directly to the edge wall 11 and a second piece 12a' which is hinged to the first piece 12a '. The articulation of the two parts 12a 'and 12a "between them, allows to align the form with the sling of the crane during the lifting of the block 100.

As can be understood in Figure 6, the articulation of the part 12a "relative to the part 12a 'is made according to a pivot axis substantially perpendicular to the plane formed by the front wall.

This characteristic is advantageous. It allows to simultaneously lift several boards while keeping their alignment. This also makes it possible not to exert too much effort on the lifting member during lifting.

In the example described here, the ring 13 is thus offset from the rear face 10b of the formwork sheet 10 to be aligned with the center of gravity of the form, which avoids the tilting of the form when lifting the latter. by the sling of the crane.

As illustrated in FIGS. 1 and 3, the support structure 2 comprises two uprights 21 and 22 forming a frame and two connecting arms 23 and 24.

In the example described here, each of the connecting arms 23 and 24 has a first end 23a and 24a which is hingedly attached to a lower portion of the rear face 10b of the formwork sheet 10.

FIG. 4 relates to another variant which differs mainly from the embodiment of FIGS. 1 to 3 in that the weighting means 25 here comprise a first 251 and a second 252 independent ballast blocks, which are symmetrical and identical between them to have a stable form on the ground.

Preferably, in this example, the blocks 251 and 252 are hinged together in a ball joint connection so as to adapt to non-planar surfaces.

In each of the two embodiments, in the same way, the lower ends 21a and 22b of each of the uprights 21 and 22 are hinged respectively to the weighting means 25 or 251 and 252 respectively.

The second ends 23b and 24b of each of the connecting arms 23 and 25 are rigidly fixed respectively to the weighting means 25 or 251 and 252.

To do this, it is provided on the weighting means or on each of the ballast blocks 251 and 252 connecting means 26 providing a pivot connection between the blocks 251 and 252 and the uprights 21 and 22.

In each of the two embodiments, the formwork box 100 further comprises a circulation platform 3 which is connected on the one hand to the main body 1 by the rear face 10b of the formwork sheet 10, and on the other hand to the support structure 2 by the upper ends 21a and 22a of each of the uprights 21 and 22.

This platform 3 allows operators to access the upper bank 11 for example for pouring concrete.

This platform 3 is accessible by a scale 31 and is secured by guardrails 32.

In practical terms, the operator (s) can thus access this platform 3 by the scale 31.

Once the reinforcement correctly introduced and positioned using a crane, operators can pour the concrete between the two panels 100 which are vis-à-vis. It will be noted here that, thanks to the weighting means 25, the chutes remain stable on the ground, whatever the weather conditions.

For the formwork, the operators have only to grasp the sling of the crane and have it cooperate with the lifting ring 13 which is substantially at man's height.

The crane operator can then maneuver his machine to move the block 100 or a pack of banches on the site.

It will be noted here that, in the example described, there is only one lifting member 12 which is centered with respect to the edge wall 11. It will be understood here that it is entirely possible to provide two members 12 lifting symmetrical relative to each other relative to the center of the edge wall 11 to improve the stability of the form when moving.

It should be observed that this detailed description relates to a particular embodiment of the present invention, but in no case this description is of any nature limiting to the subject of the invention; on the contrary, its purpose is to remove any imprecision or misinterpretation of the claims that follow.

It should also be observed that the reference signs in parentheses in the following claims are in no way limiting in nature; these signs are only intended to improve the intelligibility and understanding of the claims that follow as well as the scope of the protection sought.

Claims (10)

1. Formwork shuttering (100) for the building comprising: a) a main body (1) having: - a front wall (10) with a formwork front face (10a) and an opposite rear face (10b), - a upper wall wall (11) on which is rigidly fixed at least one lifting member (12) of the formwork comprising at its end a lifting ring (13) adapted to cooperate with a sling of a crane, and b) a support structure (2) fastened integrally to the rear face (10b) of the front wall (10), characterized in that said support structure (2) comprises weighting means (25) serving as a base and having a suitable mass to counterbalance when a tilting force is exerted on the front wall (10) for example during a gust of wind so as to ensure the stability of said wall (100) to the ground, and in that the ring of lifting (13) is offset from the front wall (10) so as to be positioned nsibly to the right of the center of gravity (G) of said section (100). 2. Board according to claim 1, characterized in that the lifting member (12) has: - a fixed proximal portion (12a) connected to the edge wall (11) and extending along the longitudinal axis (A) of the front wall (10), and - a distal portion (12b) integral with the proximal portion (12a) and off-axis of said longitudinal axis (A) towards the rear face (10b). 3. Board according to claim 2, characterized in that the proximal portion (12a) and the distal portion (12b) form an angle between 10 ° and 40 °. 4. Board according to claim 2 or 3, characterized in that the proximal portion (12a) comprises a first piece (12a ') secured integrally to the edge wall (11) and a second piece (12a ") articulated on the first piece (12a ") in a pivot connection and integral with the distal portion (12b) so as to allow the alignment of the formwork (100) with the crane sling when lifting said panel by said crane, said second piece being able to pivot relative to the first piece along an axis substantially perpendicular to the front wall. 5. shuttering board (100) according to any one of claims 1 to 4, characterized in that the weighting means (25) comprise a first (25t) and a second (252) independent ballast blocks, said first and second ballast blocks being preferably symmetrical and identical to each other. 6. shuttering formwork (100) according to claim 5, characterized in that said first (251) and second (252) ballast blocks are hinged together in a ball joint connection to adapt to the irregularities of the ground. 7. Formwork shuttering (100) according to any one of the preceding claims, characterized in that said support structure (2) comprises: at least two uprights (21, 22) forming a frame, and at least two connecting arms (23, 24) whose first ends (23a, 24a) are hingedly attached to the rear face (10b) of the main body (1). 8. Formwork shutter (100) according to claim 7, characterized in that the weighting means (25) have connecting means (26, 27) adapted to cooperate with the lower end (21b, 22b) of each of the amounts. (21, 22) so that said uprights (21, 22) are articulated on said weighting means (25). 9. formwork shutter (100) according to claim 7 or 8, characterized in that it comprises a circulation platform (3) connected to: the main body (1) by the rear face (10b) of the front wall (10); ), and - the support structure (2) by the upper end (21a, 22a) of each of the uprights (21, 22). 10. Equipment for moving a formwork slab (100) comprising: - a crane having a sling, and - a formwork slab (100) according to any one of the preceding claims.