EP3087228A1

EP3087228A1 - Three-dimensional folding formwork panel for structural shells and insulation filler in the mass thereof

Info

Publication number: EP3087228A1
Application number: EP14830980.0A
Authority: EP
Inventors: Philippe Durand
Original assignee: Constance Corp OU
Current assignee: Constance Corp SA
Priority date: 2013-12-26
Filing date: 2014-12-18
Publication date: 2016-11-02
Anticipated expiration: 2034-12-18
Also published as: ES2738544T3; FR3015994B1; EP3087228B1; MA39138A1; PT3087228T; MA39138B2; FR3015994A1; WO2015097377A1

Abstract

The invention relates to an articulated, permeable permanent formwork assembly, the method and devices for producing such an assembly, and the method for building a structure using such a panel.

Description

FOLDING TRIDIMENSIONAL FORMWORK BOARD FOR STRUCTURAL SAILS AND INSULATING FILLING IN MASS.

The present invention relates mainly to the field of buildings; it is intended for the realization of works for residential use, offices & activities in conformity with the new environmental directives, on the one hand, in the matter of insulation and, on the other hand, in protection of the planetary resources . More generally for all uses requiring a response to structural constraints combined with insulation rules that it is thermal and / or acoustic.

The outer sails of a building have 3 functions:

The resistance that allows to carry out the descents of loads of the structure, in particular its own weight and an overload of exploitation;

Defense against the external climatic environment to which the building is exposed, including watertightness, thermal and acoustic resistance, and controlled air resistance;

Accidental risks, including earthquake, hurricane, risk of breathing in conflict zones.

Traditionally, to make the outer walls of a building subject to these requirements, several methods are known.

One method is to build reinforced concrete sails. This method uses generally watertight formwork which, facing face, are connected by clamping screws. This technology requires the use of heavy formwork, which requires expensive lifting means, dangerous and energy-intensive. Moreover, since reusable forms that are dismantled after setting concrete, must be covered with formwork oil dangerous for the environment. The formwork of this technology provides nothing more to the finished work than to define and limit the dimensions of the sails.

A second method is to use, alternatively to the forms mentioned above, forms of a filter type, such as that described in the patent application FR 07/03214 (Coffratherm). On structural sails thus made, it is possible to have fasteners for supporting a support structure to attach an outer facing. The space between the outer face of the veil and the facing releases a volume that can be advantageously filled by an insulator. However, this solution has the following disadvantages identified:

- The concrete of the sails is superabundant, the stresses to which it is subjected being well below its mechanical capacity, which leads to overconsumption of energy-intensive products, such as cement, and impoverishes the resources of the planet (sand, chippings, etc .. );

- the installation of a facing is a long task so expensive,

- the fastenings in the concrete sail, which require precautions, are subject to creep; they have a weak durability and can be sources of disorders, in particular of a detachment of the facing;

- The weight of the siding exerts constraints on the fixings, whose value is even greater than the thickness of the insulation will be important;

- The insulation is most commonly made by non-porous materials. It does not allow a balance of the hygrometry between the outside and the inside of the building; and, - This method imposes a sequence of tasks which complicates the organization of the sites, increases the duration.

A third method avoids overconsumption of reinforced concrete by building sails formed of a gantry (columns / beams) reinforced concrete and a filling by industrial materials of discrete dimensions (blocks or bricks). The outer insulation is reported against the veil thus formed. This arrangement is more advantageous at the level of concrete consumption than a sail made entirely of reinforced concrete, but does not overcome the disadvantages identified above. On the contrary, fastening fasteners is less well ensured in the filling, especially if this filling is made of hollow body (hollow block or hollow brick).

A fourth method is to build wooden structure sails with built-in insulation. In this technique, the descents of loads and overloads of exploitation of the floors are taken up by structural elements of wood, whose thickness is substantially that of the veil to achieve. Panels, usually made of plywood, are attached to the structural elements on the inner and outer faces. Insulation is then placed between the outer and inner cladding plates. To reduce the weight of the floors, wooden floors are used. However, the more floors and higher operating costs, the more structural sections will have to be expanded to accommodate the lowering of loads. This is the reason why this type of realization is limited to low constructions. This technology also has the following disadvantages:

the structure has no thermal inertia and the internal comfort is that obtained by adjusting the temperature of the air inside the housing. The power very low heat of the air leads to overconsumption of energy regulation, heating or air conditioning;

- The mass is very low and leads to acoustic insulation problems between homes, mainly at floor level. To overcome this disadvantage, a complement of fibrous insulation is placed in the floors but this solution remains expensive and imperfect; and,

- resistance to exceptional storm, hurricane and fire phenomena is particularly weak.

A fifth method, derived from the fourth, is to build sails in wood structure, a natural insulation is either projected on an inner plate, or poured and packed between two formwork plates. In addition to the disadvantages mentioned above, when this technology uses natural insulating products, such as hemp, the drying time is very long and requires to leave the formwork in place for several days. But more serious, the retting is never perfect, it remains in the insulation of mold germs that, in the presence of water enclosed between the formwork walls, develop quickly and irremediably. In addition, this method leads to losses of insulating material, thus additional cost in terms of material and labor.

The invention is particularly intended to provide a device and a method of construction for making sails whose geometry is guaranteed while ensuring good thermal insulation and, preferably, phonic.

According to a first object of the invention, a formwork assembly is characterized in that it comprises two shuttering panels pierced with filtering holes, and a mechanical device designed to allow said assembly to take a folded position, in which both panels are folded over one another, and an extended position, in which said panels are spaced apart one of the other of a distance corresponding to a thickness of said work. The mechanical device is advantageously designed to keep the panels generally parallel to each other. In addition, such a mechanical device preferably comprises at least two rows of mechanisms, the mechanisms of the same row preferably being integrally coupled together.

Each mechanism can include:

- a large rod;

- a small rod; and,

- A connecting rod constituting with the small rod a knee device;

a first end of the large rod and a first end of the small rod being fixed and articulated, in the vicinity of each other, each with a first of the panels; a second end of the large rod being fixed and articulated with the second of the panels; a first end of the connecting rod being fixed and articulated with the second panel, away from the second end of the large rod; and a second end of the small rod being fixed and articulated with a second end of the connecting rod thus forming the toggle joint; so that :

- In the folded position, the rods and connecting rods of the mechanical device are substantially coplanar; and,

- In the deployed position, for the same row, the large rods are substantially in the same foreground as the small rods and connecting rods are substantially in the same plane and the two planes form between them a non-zero angle.

The rods may have a V-shape, the tip of which constitutes their second end and the free ends of which each constitute a first end. Advantageously, the large rods and / or small rods of the same row are made in one piece, preferably in a mild steel rod, so that the rods are secured to each other by their first ends.

The invention also relates to a magazine for storing, one on the other and in the folded position, several rows of mechanisms integral with each other, designed to articulate a formwork assembly according to the invention, and characterized in that comprises substantially vertical slides to slide the rows and maintain each row substantially horizontal and in its folded position. This magazine advantageously comprises at least one release device disposed at the bottom of each slide to distribute from below, one after the other, each row contained in said magazine.

The invention also relates to a bench for manufacturing a formwork assembly according to the invention, characterized in that it comprises:

- a table to extend a panel;

at least one magazine according to the invention, arranged above the table, for dispensing and fixing at least one row on this panel; and,

means for moving this panel in translation on the table.

The invention also relates to a method of manufacturing a formwork assembly according to the invention using a manufacturing bench according to the invention, characterized in that it comprises the following steps:

- we first put a first panel on the table; then,

- Depositing on this first panel and from a respective store, one or more rows equipped with connectors; and, - Fixing each row by means of some of said connectors, through a pressure exerted by the corresponding magazine, by snapping of some of the connectors into holes of the first panel; then,

this first panel is moved on said table, so as to introduce a second panel under the magazine;

- the first and second panels are connected edge to edge with each other;

a third panel is deposited above the rows already fixed on the first panel; then,

- This third panel is fixed by means of the other connectors by snapping into corresponding holes of the third panel; and,

these operations are repeated so as to constitute a formwork assembly of a desired width.

The invention also relates to a method of constructing a veil, characterized in that it comprises the following steps:

- Formwork and reinforcement of a structure of a type formed of columns and beams;

- Providing a formwork assembly according to the invention adapted to form a part of the web between posts and beams;

- Set this assembly in the folded position, so that one of its panels coincides substantially with a face to form the veil; then,

deployment of this assembly so that the other panel coincides with a face opposite to form the veil; then,

filling of the assembly with filling mixture.

The filling mixture is advantageously brought by a nozzle by air, in a dry form, means being provided for wetting the mixture at the outlet of the nozzle. Preferably, the filling material is a premixed mixture, comprising vegetable fibers, preferably flax fibers, and a hydraulic binder, preferably lime.

Several embodiments of the invention will be described below, by way of non-limiting examples, with reference to the appended drawings in which:

Figure 1 is a partial view, from above, of an embodiment for a formwork assembly according to the invention;

Figure 2 is a perspective view of a formwork panel for the assembly of Figure 1;

Figure 3 is a perspective view of a foldable mechanical device for the formwork assembly of Figure 1, in the closed position;

Figures 4 and 5 each illustrate a respective articulation of the mechanical device of Figure 3;

Figure 6 is a perspective view of the mechanical device of Figure 3, in fully deployed position;

Fig. 7 is a perspective view of a connector for the mechanical device on the formwork panel of Fig. 2;

Figure 8 is a perspective view of the mechanical device of Figure 3, in a folded position and storage on bars;

Fig. 9 is a perspective view of a storage and dispensing magazine for the mechanism of Fig. 3; FIG. 10 illustrates a bench and a method of manufacturing a formwork assembly according to the invention; and,

Figures 11 to 15 illustrate a method of construction using form elements according to the invention.

Figure 1 illustrates a top view of a formwork assembly according to the invention, comprising two formwork panels 2, 3, interconnected by articulated mechanisms 5. A formwork panel is an interior panel 2, that is to say intended to form the face of a structure veil, the inner side of a building, the other panel is an outer panel 3, that is to say ie designed to form the other side of the veil, outside of the building.

As illustrated in particular in FIG. 2, each panel 2, 3 has the form of a grid, comprising orifices 6 separated from each other by partitions 7. In order to promote a perspiration function of the veil, the porosity will be increasing since the beginning. inside the building to the outside. This objective can be achieved, for example, the orifices of the inner panel may have a lower pressure drop than that of the outer panel, for example due to a different section of the orifices 6.

Each mechanism 5 is fixed, on the one hand, to the inner panel 2 and, on the other hand, to the outer panel 3. Preferably, each formwork assembly comprises at least two rows of mechanisms 5 each located in a respective horizontal plane ; preferably at a distance substantially equal to the thickness of the veil to form.

In the example shown, the widths L2, L3 of the panels 2, 3 are substantially identical, against the height H2 of the inner face 2 is less than the height H3 of the outer face 3. The difference in height H3- H2, is substantially equal to the thickness of the upper slab to rest on the veil to form.

Figures 3 to 7 illustrate the mechanisms 5. Figure 3 illustrates two mechanisms 5 coupled together in a folded position, Figure 6 shows the same mechanisms in a fully deployed position. Each mechanism 5 comprises:

- A large rod 11, of circular section, V-shaped;

- A small rod 12, of circular section, V-shaped; and,

- a connecting rod 13.

The mechanism is connected to the panels 2, 3 by connectors 14, identical to each other, more particularly illustrated in FIGS. 4 and 7.

The distal ends 15 of each rod 11, 12, that is to say the ends of the V furthest from the tip 16, 17 of the respective V, are distant from each other by a distance D15 and D16. These values are linked by the relation:

D15 = D16 x 2 + the center distance 32-33

that is to say the distance between the connectors 14. The value of the distance D16 is also identical to the spacing between the axes of rotation of the connecting rod.

Each distal end 15 of one rod is connected with a distal end 15 of the other rod and with the outer panel 3 by a first connector 14A (see FIG. 1). Advantageously, as particularly shown in Figure 4, the distal ends 15 of the large rods 11 of two coupled mechanisms 5 are in one piece and form between them a bend providing a pivot function with the first connector 14A; it is the same for the ends of the distal 15 small rods 12 of the two coupled mechanisms. The rods 11, 12 are held in respective notches of the first connector by a connector clip 20 (see Figure 4). A second connector 14B connects the tip 16 of the large rod 11 with the inner panel 2; the large rod 11 provides with the second connector 14B a pivot function.

A third connector 14C connects a first end 18 of the connecting rod 13 with the inner panel 2; the rod 13 provides with the third connector 14C a pivot function.

The tip 17 of the small rod 12 is fixed to a second end 19 of the rod 13, longitudinally opposite its first end 18; the rod 13 provides with the small rod 12 a pivot function and toggle.

For the same set of formwork 1, all the pivots are axes parallel to each other, and the panels 2, 3. All the first connectors 14A mated mechanisms are aligned with each other; it is the same for their second connectors 14B between them and their third connectors 14C between them. A formwork assembly according to the invention comprises at least two rows of coupled mechanisms 5, not aligned but parallel to each other; a single row of two mechanisms is illustrated in Figures 3 and 6.

Thus, in the folded position of Figure 3, the rods 11, 12 and the rod 13 are folded substantially in the same plane, sandwiched between the two panels (not shown in Figure 3). By removing the inner panel 2 from the outer panel 3, the mechanisms 5 can be deployed, the panels being kept parallel to each other until the mechanisms 5 take the fully extended position of FIG. 6. In this position, the panels are kept at a maximum distance from one another, corresponding to the thickness of the web to form between them. Thus, the dimensions of the rods and the connecting rod determine the thickness of the veil. In addition, in this position deployed, the small rod 12 is in a plane different from that of the large rod 11 and, the small rod is substantially coplanar with the connecting rod 13.

Advantageously, as particularly illustrated in Figure 5, the tip 17 is inserted into a notch of the end 19 of the rod 13 and is held there by a clip 21, snapped onto this end 19. The clip 21 comprises two pairs of 22 elastic pins vis-à-vis one another. The lugs are intended to remain compressed between the branches of the V formed by the small rod, except when the mechanism is in its fully extended position, so that they maintain the relative position, coplanar with the connecting rod and the small rod 12, that is to say, their position of Figure 6, thus preventing the shuttering assembly closes.

Preferably, the small rods of the same row of coupled mechanisms, are formed in one piece formed in "zigzag" from a soft iron bar, insensitive to corrosion in the presence of the binder, including the lime. It is the same for large rods. In the example illustrated, the connecting rod 13 is made of a plastic or composite material, with a current section in the form of an I, the core of which is pierced in order to constitute a minimum obstacle to the filling of the formwork; this arrangement also makes it possible to give it an elasticity capable of filtering a transmission of sound waves.

A connector 14 is particularly illustrated in FIG.

The connector 14 is a thin plastic part E14, between two faces 25 opposite and substantially parallel to each other and of substantially constant section over the entire thickness. It is substantially symmetrical with respect to a plane of symmetry P14, perpendicular to the faces 25. The connector comprises a base 23, perpendicular to the plane of symmetry P 14; below the base, it comprises two staples 24 extending from the base 23, each of the staples being designed to snap into a respective opening 6 of a panel 2, 3, to hold the base 23 pressed against the sign.

A positioning disbursement 27 is formed in each face 25. Its bottom and its fields are inclined relative to the face 25 to maintain the position of the connector 14 during the establishment of the corresponding mechanism during the manufacture of the corresponding formwork assembly.

A central hole 28, crossing from one face to the other, is provided for storage of the connector, with others, on a spacer rod 36 provided to pass therethrough. This rod can also maintain the spacing between adjacent connectors. As illustrated in Figure 8, this bar, not shown, is intended to be part of a store used for a mechanized manufacture of a formwork assembly 1; this magazine 37, illustrated in Figure 9, is provided to release one by one of the rows of mechanisms 5 at the desired locations.

Three notches 31, 32, 33 are disposed at one end of the remote connector of the base 23, opposite the staples 24. A first notch 31, arranged in the plane of symmetry P14 is provided to receive the tip of the large rod ; the two other notches 32, 33, disposed on either side of the plane of symmetry P14, are provided to receive the distal ends of the small and large rod, each respectively.

Two grooves 34 are provided on either side of the notches 31-33, to insert the staple 20; pins 29 are arranged at the end of the connector, in the vicinity of one face 25 and the other, to hold the staple 20 between them. We will now describe the manufacture of a formwork assembly 1, using a method according to the invention, with reference to FIGS. 8 to 10.

FIG. 8 illustrates a row 55 formed, by way of example, of three coupled mechanisms 5 whose large rods 11 are made in one piece, as well as the small rods 12.

The first connectors 14A and the third connectors 14C of the row 55 are all traversed by a single spacer rod 36, passing through their respective central hole 28, so that these connectors are kept substantially aligned with each other and equidistant. The second connectors 14B of the row 55 are all traversed by a single other spacer rod 36, passing through their respective central hole 28, so that these connectors are also maintained substantially aligned and equidistant from each other. These two spacer rods 36 are equipped, each at each of their ends, with a guide 38, designed to fit into a respective slide 39 of the magazine 37, illustrated in FIG. 9.

The magazine 37 comprises four vertical uprights 40, forming between them a rectangular parallelepiped; Each upright 40 includes a respective slide 39. A suitable structure 41 ensures the rigidity of the magazine 37. In FIG. 9, the magazine 37 comprises three rows 55 of mechanisms, arranged one above the other, each guide 38 of each row having been introduced from the top into a slideway. 39 respective. A release device 42 is disposed at the bottom of each post 40. The release devices 42 are synchronized with one another and are provided for releasing, from below, each row 55 contained in the magazine, one by one. FIG. 10 illustrates a manufacturing bench 50 for a formwork assembly 1 according to the invention. The bench 50 comprises a substantially horizontal table 51 for resting a panel 2, 3 formwork and a stop rule 52 whose position on the table is adjustable and against which one just presses an edge of the panel 2, 3. In the example illustrated, the bench 50 further comprises three stores 37 disposed above the table 51 and provided to deposit three parallel rows of parallel mechanisms 55 of the panel 2, 3 parallel to the rule 52. Translating means allow moving the panel 2, 3 resting on the table 51 along the ruler 52; these displacement means may advantageously comprise pins inserted into the orifices 6 of the panel to drive the panel in motion.

In the manufacturing mode illustrated in FIG. 10, the following steps are carried out:

first, the inner panel 2 is placed on the table 51; then,

a first series of three rows 55 is deposited on the inner panel; and,

each row 55 is fixed, thanks to a pressure exerted by the corresponding magazine 37, by snapping the second connectors 14B and the third connectors 14C into corresponding openings 6 of the inner panel; then,

- The inner panel 2 is moved on the table 51, so as to introduce a second panel 2B under the magazines 37;

- Connects, edge to edge, the first inner panel 2 with the second inner panel 2B;

- A first outer panel 3 is deposited above the rows 55 already fixed on the first inner panel 2; then,

it is fixed there by snapping the first connectors 14A and in corresponding orifices 6 of the first outer panel 3; and, these operations are repeated so as to constitute a formwork assembly of a desired width.

The assembly of the rows of mechanism is advantageously carried out in the factory, the stores used for their storage and transport. The manufacture of the formwork sets can be realized in factory or on site, according to the organization and the size of the building site.

A method of constructing a sail for a building will now be described, in particular with reference to FIGS. 11 and following.

FIG. 11 illustrates a partial perspective view from the inside of a building, of a sail 60 made at the edge 61 of a floor 61. The sail 60 comprises an opening 62 intended to receive a window, above of a spandrel 63. The veil is made according to a structure of the type posts / beams of reinforced concrete; three posts 64 are shown, supporting a beam 65; the remainder of the web 60 being constituted, between the columns and beams, of a concrete fiber filling of plant fibers, for example of hemp concrete. This filling is in itself an insulator. Plates 67 of a specific insulator are disposed on the outer side of the posts 64, the beam 65 and the edge 61R; this insulator 67 is chosen so that the posts and the beams do not constitute a thermal bridge, that is to say that the thermal conductivity of the web 60, measured between the inside and the outside of the building is substantially everywhere the same, especially that at the right of posts and beams, it is substantially the same as the right of filling.

As illustrated in FIGS. 12 to 15, a method according to the invention for making the web 60 comprises the following steps: - As particularly illustrated in Figure 12, is carried out first, in a traditional way, the formwork 61 for the posts and a formwork 62 of the underside of the beam; then,

- As particularly illustrated in Figure 13, there are sets of formwork 1 according to the invention in the folded position between the forms of the posts, so that the outer panel 3 is in its place, that is to say, defining the face outer of the veil to achieve; then,

as particularly illustrated in FIG. 14, each shuttering assembly is deployed, so that the inner panel 2 comes to take its place against the inside of an inner formwork panel of the posts 61, so that the thickness of the veil is defined between the two panels 2,3 of each set 1; then,

- As particularly illustrated in Figure 15, each formwork assembly 1 is filled with a filling mixture, using a nozzle 63. The mixture is preferably an insulating mixture of biomass fibers.

The filling nozzle 63 is fixed to the end of a sleeve preferably having a diameter of between 80 and 100 millimeters. The filling material is preferably a dry mixture comprising plant fibers especially mixed with a hydraulic binder, comprising for example lime, the previously kneaded. The end of the nozzle 63 is equipped with a vaporizer connected to a water inlet pipe. The water flow rate is adjusted so that the amount of water is sufficient, preferably just sufficient, for a complete pozzolanic reaction of the binder.

As previously illustrated, the filling material, insulating, is preferably constituted by porous and fibrous materials. These materials, light, are easily conveyed in the sleeve and the nozzle 63 by air. These materials are stopped in contact with the formwork panels 2, 3; these panels being filtering because comprising the orifices 6 described in the 2, the air escapes through these orifices 6. The section of each orifice decreases from the inside of the shuttering assembly towards the outside, whose section is reduced from the inside to the outside the wall, so that, thanks to this arrangement, each panel retains the solid parts of the materials and, in addition, strongly compresses them under the effect of the pressure of the air that tries to escape through the material then holes.

Of course, the invention is not limited to the examples which have just been described.

Claims

claims

1. Assembly (1) for forming a work (60),

characterized in that it comprises two shuttering panels (2, 3) pierced with filtering holes (6), and a mechanical device (5, 55) designed to allow said assembly to assume a folded position, in which both panels are folded over one another, and an extended position, wherein said panels are spaced from each other by a distance corresponding to a thickness of said structure.

2. shuttering assembly (1) according to one of claims 1 or 2, characterized in that the mechanical device (5, 55) is designed to keep the panels parallel to each other.

3. shuttering assembly (1) according to one of claims 1 or 2, characterized in that the mechanical device (5, 55) comprises at least two rows (55) of mechanisms (5), the mechanisms of the same row being preferably integrally coupled together.

4. Formwork assembly according to claim 3,

characterized in that each mechanism (5) comprises:

- a large rod (11);

- a small rod (12); and,

- a connecting rod (13) constituting with the small rod (12) a toggle device;

a first end (15) of the large rod and a first end (15) of the small rod are fixed and articulated, in the vicinity of each other, each with a first panel (3) among the panels (2, 3); a second end (16) of the large rod (11) is fixed and articulated with the second panel (2); a first end (18) of the connecting rod (13) is fixed and articulated with the second panel (2), away from the second end (16) of the large rod; and, a second end (17) of the small rod (12) is fixed and articulated with a second end (19) of the connecting rod (13) thus forming said toggle joint; so that :

- In the folded position the rods and connecting rods of the mechanical device (55, 5) are substantially coplanar; and,

in the deployed position, for the same row (55), the large rods

(11) are substantially in the same foreground, as the small rods

(12) and the connecting rods (13) are substantially in the same second plane and that the two planes form between them a non-zero angle.

Formwork assembly according to claim 4,

characterized in that the rods (11, 12) have a V-shape, the tip of which constitutes their second end (16, 17) and the free ends of which each constitute a first end (15).

Formwork assembly according to claim 5,

characterized in that the large rods and / or the small rods of the same row are made in one piece, preferably in a mild steel rod, so that the rods are secured together by their first ends ( 15).

7. Store (37) for storing, one on the other and in the folded position, several rows (55) of mechanisms (5) integral with each other, designed to articulate a formwork assembly (1) according to one of claims 3 to 6, characterized in that it comprises slides (39) substantially vertical to slide said rows (55) and keep each row substantially horizontal and in its folded position.

8. Magazine according to claim 7,

characterized in that it comprises at least one release device (42) disposed at the bottom of each slide (39) to distribute from one bottom to the other, each row (55) contained in said magazine.

Bench (50) for the manufacture of a formwork unit (1) according to one of Claims 1 to 6,

characterized in that it comprises:

- a table (51) for extending a panel (2, 3);

- At least one magazine (37) according to claim 8, disposed above the table, for dispensing and attaching at least one row (55) on said panel; and,

means for moving said panel in translation on said table.

10. A method of manufacturing a formwork assembly (1) according to one of claims 1 to 6 using a bench according to claim 9,

characterized in that it comprises the following steps:

- the first panel (2) is first placed on the table (51); then,

- Depositing on said first panel and from a respective magazine (37), one or more rows (55) equipped with connectors (14); and,

- Fixing each row (55) by means of some of said connectors (14), through a pressure exerted by the magazine (37) corresponding, snapping said connectors in orifices (6) of said first panel; then,

moving said first panel (2) on said table (51), so as to introduce a second panel (2B) under the magazine (37);

- the first and second panels are connected edge to edge with each other;

- A third panel (3) is deposited above the rows (55) already fixed on the first panel (2); then,

- It is fixed to the connector means (14) by snapping into corresponding holes (6) of the third panel (3); and, these operations are repeated so as to constitute a formwork assembly of a desired width.

11. A method of constructing a web (60),

characterized in that it comprises the following steps:

- Provision of a formwork assembly (1) according to one of claims 1 to 6, adapted to form a part of said web (60) between posts and beams;

- Installation of said assembly (1) in the folded position, so that one of its panels (2, 3) substantially coincides with a face casing said web (60); then,

- Deployment of said assembly (1) so that the other panel coincides with a face opposite form of said web (60); then,

filling said assembly with filling mixture.

12. Construction method according to claim 11,

characterized in that the filling mixture is supplied by a nozzle (63), by air, in a dry form, and in that means are provided for wetting said mixture at the outlet of the nozzle.

13. The method of construction, according to one of claims 11 or 12, characterized in that the filling material is a premixed mixture comprising plant fibers, preferably flax fibers, and a hydraulic binder, preferably the lime.