Formwork bench comprising a sealing device and associated method

Abstract

A formwork panel comprising a formwork face comprising at least one passage orifice configured to receive a spacer device, formwork panel characterized in that it comprises at least one sealing device (4) configured to be mounted in an attached manner to a periphery of the passage orifice, the sealing device (4) comprising a support member (40) comprising an annular groove (41) in which an O-ring (42) with an expansion clearance is mounted, the O-ring (42) comprising an internal diameter configured to expand between a minimum diameter of between 16mm and 26mm and a maximum diameter of between 23mm and 33mm. Abstract figure: Figure 6

Description

Title of the invention: Formwork bench comprising a sealing device and associated method Technical field

[0001] The present invention relates to the field of construction formwork, and more particularly to formwork hips.

[0002] As illustrated in [Fig.l], in order to form a concrete wall, also called a "concrete wall", it is known to form a formwork with two formwork hips B10, B20, mounted opposite each other. In a known manner, each formwork panel B10, B20 comprises a formwork face F10, F20 intended to come into contact with the concrete. There is a front formwork panel B10 and a rear formwork panel B20 defined along an axis X which extends orthogonally relative to the formwork faces F10, F20 of the formwork hips B10, B20. The X axis extends on [Fig.l] from right to left, that is to say, from front to rear. In this document, the terms "front" and "rear" refer to a user positioned facing the front formwork panel B10.

[0003] With reference to [Fig.l], to obtain a concrete wall of the desired thickness, it is necessary to precisely adjust the spacing between the formwork faces F10, F20. For this purpose, it is known to place spacing cones 102 between said formwork faces F10, F20. Each spacing cone 102 has a length corresponding to the thickness of the concrete wall to be produced. In other words, it is necessary to have spacing cones 102 of different lengths in order to form walls of different thicknesses.

[0004] In a known manner, with reference to [Fig.2], each formwork face F10, F20 of a formwork panel B10, B20 comprises a plurality of orifices 010, 020 which pass through it transversely. It is known to guide a spacer rod 101 in each through orifice 010, 020, so as to securely connect the formwork hips B10, B20. During a formwork operation, the spacer rod 101 penetrates the through orifice O10 of the front panel B10, then the spacing cone 102 and the through orifice 020 of the rear panel B20. In a known manner, each spacer rod 101 is tightened at its ends, for example by means of a nut 103, to constrain the formwork faces F10, F20 against the ends of the spacing cone 102 into which the spacer rod 101 is introduced.

[0005] When the concrete in a pasty state is introduced into the formwork, that is to say when the concrete is poured, the latter fills the formwork with the exception of the internal cavities 102c of the spacing cones 102 which are sealed.

[0006] After the concrete has dried and hardened, an operator can loosen the spacer rods 101 to remove them. A spacer rod 101 can be easily removed since it extends into the interior cavity 102c of a spacer cone 102 and is not in contact with the concrete. The formwork panels B10, B20 are then removed to reveal the wall.

[0007] However, the use of spacer cones 102 requires an operator to insert the spacer rod 101 into the front formwork panel B10 and then to position the spacer cone 102 on standby on the spacer rod 101 between the two formwork panels B10, B20. For safety reasons, it is desirable to avoid an operator being positioned between the two formwork panels B10, B20. In addition, the positioning of the spacer cones 102 disrupts the installation of reinforcement between the formwork panels B10, B20.

[0008] The invention thus aims to eliminate at least some of these drawbacks by proposing a new type of spacer rod which makes it possible to do without the use of spacer cones and which can be used to form walls of different thicknesses. PRESENTATION OF THE INVENTION

[0009] The invention relates to a formwork panel comprising a formwork face comprising at least one passage orifice configured to receive a spacer device, formwork panel characterized in that it comprises at least one sealing device configured to be mounted in an attached manner to a periphery of the passage orifice, the sealing device comprising a support member comprising an annular groove in which an O-ring with an expansion clearance is mounted, the O-ring comprising an internal diameter configured to expand between a minimum diameter of between 16mm and 26mm and a maximum diameter of between 23mm and 33mm.

[0010] Thanks to the invention, the O-ring can accommodate a large variation in diameters. This allows the same sealing device to be used with both an introduction formwork and a receiving formwork. The sealing device is thus universally usable, which is advantageous. The sealing is sufficient to prevent any formation of a concrete bridge of large cross-section. Thus, even if a small quantity of liquid concrete flows through the sealing device, the solidified concrete can be broken quickly when the spacer device is removed.

[0011] Thanks to the invention, a spacer device can be put in place simply and quickly between the two formwork panels without requiring the prior installation of a spacer cone. It is thus no longer necessary for an operator to position himself between the formwork panels and hold the spacer cone, which limits its arduousness. A spacer device can be installed and removed by an operator from a front position.

[0012] According to one aspect, the sealing device comprises a locking member configured to cooperate with the support member in order to tighten the sealing device on either side of the passage orifice. This makes it possible to quickly mount a sealing device on a conventional formwork panel.

[0013] Preferably, the sealing device is removably mounted.

[0014] According to one aspect, the support member projects from the formwork face. This advantageously makes it possible not to modify the passage orifices while retaining a spacer device rod of sufficient diameter to transmit the concreting forces.

[0015] According to one aspect, the support member comprises a body in which the annular groove is formed, the body comprising an outer surface of flared shape, preferably frustoconical. Such an outer surface makes it easier to remove the formwork panel.

[0016] According to one aspect, the support member comprises a radiated edge. This makes it easier to remove the formwork and avoids any damage to the concrete wall.

[0017] The invention also relates to an assembly of a front formwork panel as presented previously, designated introduction panel, and a rear formwork panel as presented previously, designated receiving panel, positioned opposite each other for the formwork of a wall, the assembly comprising a spacer device mounted in the passage holes of the formwork hips, the spacer device comprising: • A rod extending longitudinally along a rod axis oriented from front to rear, the rod comprising a first threaded end configured to be screwed into the receiving form and a second end configured to be manipulated by an operator from the introduction form, • At least one protective member mounted on the rod and configured to extend between the formwork faces, the protective member comprising a main body of flared shape cooperating with the sealing devices of the formwork hips.

[0018] Thanks to the invention, a spacer device can be put in place simply and quickly between the two formwork hips without requiring the prior installation of a spacer cone. It is thus no longer necessary for an operator to position himself between the formwork hips and hold the spacer cone, which limits its difficulty. A spacer device can be put in place and removed by an operator from a front position. This is very advantageous when the receiving formwork is difficult to access, in particular when it is suspended from the introduction formwork. In addition, the spacer device can be installed after the reinforcement between the forms.

[0019] Preferably, the method comprises a step consisting of: • Insert the first threaded end of the rod into the insertion hole of the insertion formwork in a front-to-back movement, so as to successively pass through the passage hole of the first formwork and the passage hole of the second formwork, the protective member extending between the formwork faces, the O-ring of the sealing device mounted in the passage hole of the first formwork is more radially expanded than the O-ring of the sealing device mounted in the receiving hole. PRESENTATION OF FIGURES

[0020] The invention will be better understood on reading the description which follows, given by way of example, and referring to the following figures, given by way of non-limiting examples, in which identical references are given to similar objects.

[0021] [Fig.l] is a schematic side view of a rear formwork panel and a front formwork panel connected by spacer rods according to the prior art.

[0022] [Fig. 2] is a schematic side sectional representation of a spacer rod according to the prior art.

[0023] [Fig. 3] is a schematic side view of a receiving formwork panel and an inserting formwork panel connected by spacer devices according to one embodiment of the invention.

[0024] [Fig.4] is a schematic representation of the insertion formwork panel from the front.

[0025] [Fig.5] is a cross-sectional view of the receiving formwork panel and the inserting formwork panel in the presence of sealing devices and a spacer device.

[0026] [Fig.6] is a close-up schematic representation of the sealing device of [Fig.5].

[0027] [Fig.7] is a schematic sectional representation of a sealing device according to the invention.

[0028] [Fig.8] is a schematic perspective representation of the sealing device.

[0029] [Fig.9] is another schematic perspective representation of the device sealing.

[0030] [Fig. 10] is a schematic perspective representation of the spacer device.

[0031] [Fig. 11] is a schematic side view of the spacer device.

[0032] It should be noted that the figures set out the invention in detail to implement the invention, said figures can of course be used to better define the invention where appropriate. DETAILED DESCRIPTION OF THE INVENTION

[0033] With reference to [Fig. 3], there is shown a front formwork panel, designated introduction panel B1, and a rear formwork panel, designated reception panel B2, positioned opposite each other for the formwork of a wall having a predetermined thickness EP.

[0034] Each formwork panel B1, B2 comprises a vertical wall PI, P2 comprising a formwork face F1, F2, intended to be arranged internally to the formwork and to be in contact with the poured material, and an external face, respectively opposite the formwork face F1, F2. In this example, each formwork panel B1, B2 is defined in an orthogonal reference frame (X, Y, Z) in which the X axis extends horizontally from back to front, the Y axis extends laterally from right to left ([Fig.4]) and the Z axis extends vertically from bottom to top.

[0035] With reference to [Fig.4], the vertical wall PI of the introduction formwork B1 comprises in this example four introduction orifices 01 extending perpendicular to the plane (Y, Z) defined by the formwork face F1 to each receive a spacer device 1 according to the invention. It goes without saying that the number of introduction orifices 01 could be different. In particular, the introduction formwork B1 could comprise only two introduction orifices 01 in the low position. This is for example the case when the hips B1, B2 are equipped in the upper part with spacing devices.

[0036] Similarly, the vertical wall P2 of the receiving formwork B2 comprises in this example four receiving orifices O2 (not shown) extending perpendicular to the plane (Y, Z) defined by the formwork face F2. It goes without saying that the number of receiving orifices O2 could be different. In particular, the receiving formwork B2 could comprise only two receiving orifices O2 in the low position.

[0037] In this example, with reference to [Fig.5], the receiving orifices 02 have a standard diameter so as to allow the passage of a rod. Preferably, each receiving orifice 02 has a diameter D2 of between 24mm and 35mm.

[0038] In this example, each introduction orifice 01 has a diameter DI which is identical to the diameter of a reception orifice 02.

[0039] Each introduction orifice 01 and each reception orifice 02 are also designated “passage orifice”.

[0040] As illustrated in [Fig.5], the vertical wall PI of the introduction hip B1 comprises a spacer block 10 mounted opposite each introduction orifice 01. With reference to [Fig.5], the spacer block 10 comprises a clamping wall 11 which extends parallel to the formwork face F1 and is offset relative to the latter by a spacing distance which is predetermined. Preferably, the spacing distance is between 150mm and 250mm. Originally, the clamping wall 11 is used as a reference surface for adjusting the thickness of the wall to be formed.

[0041] The clamping wall 11 comprises a through opening 012 which is aligned along a longitudinal axis XE with the introduction orifice 01 associated with the spacer block 10.

[0042] Preferably, the vertical wall P2 of the receiving panel B2 comprises a receiving block 20 mounted opposite each receiving orifice O2. With reference to [Fig. 5], the receiving block 20 comprises a receiving member 21, in particular, a threaded receiving nut for cooperating with a threaded end of a spacer rod. The receiving member 21 is aligned with a receiving orifice O2.

[0043] When connecting the formwork hips B1, B2 opposite each other, the introduction orifices O1 and reception orifices O2 are aligned along the longitudinal axis XE as illustrated in [Fig.5]. Preferably, a spacer block 10 and a reception block 20 have similar structures. Each block 10, 20 can advantageously be used for the introduction or reception

[0044] With reference to [Fig. 5], each formwork panel B1, B2 comprises a sealing device 4 mounted in its introduction orifice O1 / its receiving orifice O2, designated "passage orifice O1, O2". In this embodiment, the sealing device 4 is mounted in a separate manner in the passage orifice O1, O2 so as to allow the existing stock of formwork panels B1, B2 to be adapted.

[0045] A sealing device 4 is shown in detail in Figures 6 to 9. The sealing device 4 comprises a support member 40 comprising an annular groove 41 in which an O-ring 42 is mounted with a radial expansion clearance A. In this example, the O-ring has an average diameter of 29mm and a thickness of 8mm.

[0046] The O-ring 42 comprising an inner diameter configured to expand between a minimum diameter of between 16mm and 26mm, preferably between 20mm and 23mm, and a maximum upper diameter of between 23mm and 33mm, preferably between 25mm and 29mm. Preferably, the expansion is at least 4mm, preferably at least 5mm. The radial expansion clearance A, defined between the inner diameter of the annular groove 41 and the outer diameter of the O-ring 42 is between 1mm and 5mm.

[0047] The support member 40 has a central opening 46 into which the spacer device 1 can be inserted.

[0048] As will be presented later, such a sealing device 4 can receive in a sealed manner a spacer device 1 having a flared portion, that is to say, defining different diameters as will be presented later.

[0049] With reference to [Fig.7], the support member 40 comprises a first part 40a in which the annular groove 41 is formed, which is configured to extend between the formwork faces F1, F2 as illustrated in [Fig.6]. In other words, the first part 40a forms a projection relative to the plane of the formwork face F1 in which the sealing device 4 is mounted. It nevertheless goes without saying that the first part 40a could also be retracted into the passage opening O1 to avoid forming a projection; this nevertheless has the disadvantage of requiring the use of small-diameter spacer rods.

[0050] Still with reference to [Fig.7], the first part 40a comprises a body which has a flared shape whose section decreases towards the inside of the formwork so as to simplify stripping. The body of the first part 40a is in the form of an annular box whose outer surface 43 is flared, preferably frustoconical. The first part 40a preferably has an annular edge 44 which is radiated, that is to say curved, so as to facilitate stripping.

[0051] Still with reference to [Fig.6] to 9, the support member 40 comprises a second part 40b configured to extend behind the formwork face F1 so as to allow the mounting of the sealing device 4. In this example, with reference to [Fig.7], the second part 40b is in the form of a cylindrical part whose outer surface 45 is threaded.

[0052] The sealing device 4 comprises a locking member 49 configured to cooperate with the support member 40, in particular, with the threaded outer surface 45 in order to tighten the sealing device 4 to fix it to the formwork face F1, F2. Preferably, the locking member 49 is in the form of a locking nut.

[0053] As indicated previously, the sealing device 4 is mounted in a reported manner on the wall of a traditional formwork so that the first part 40a extends inside the formwork as illustrated in [Fig.6]. The assembly is simple and practical since it is sufficient to tighten the locking member 49 to the support member 40.

[0054] A spacer device 1 according to one embodiment of the invention will be do- now presented with reference to figures 10 to 11.

[0055] The spacer device 1 comprises a rod 2 extending longitudinally along a rod axis T oriented from front to rear. The rod 2 comprises a first threaded end 2A (rear end) configured to be screwed into the receiving form B2 and a second end 2B (front end) configured to be manipulated by an operator from the introduction form B1. Preferably, the rod 2 is made of metal to absorb the concreting forces. Preferably, the rod 2 has a length of between 500mm and 1000mm and a diameter of between 15mm and 32mm, preferably 17mm. In this example, only the end 2A is threaded but it goes without saying that the thread could extend over other portions of the rod 2.

[0056] The spacer device 1 further comprises at least one protection member 3 mounted on the rod 2 and configured to extend between the inner formwork faces F1, F2 of the formworks B1, B2. In this example, the protection member 3 has a conical shape that flares from the rear to the front so as to facilitate the removal of the spacer device 1 by translation towards the front along the rod axis T as will be presented later. The protection member 3 can be made of plastic. In this example, with reference to [Fig.l 1], the protection member 3 has a section that increases between a rear end 3A and a front end 3B. The rear end 3A has a diameter D31 of the order of 19mm while the front end 3B has a diameter D32 of the order of 23mm. The diameter D32 is larger than the diameter D31 by a diameter difference of between 1mm and 7mm. The rear end 3A is preferably radiused (chamfered).

[0057] With reference to [Fig.7], the protective member 3 has a length L3 which is greater than or equal to the desired spacing between the formwork panels B1, B2, i.e., the thickness of the wall to be formed. The length L3 is preferably between 280mm and 340mm. In this example, the protective member 3 is mounted irremovably on the rod 2 but it goes without saying that the reverse is possible. According to one aspect of the invention, the protective member 3 is radially non-deformable relative to the rod axis T. The protective member 3 is smooth to facilitate formwork removal.

[0058] With reference to Figures 10 to 11, the spacer device 1 further comprises a clamping member 7 secured to the rod 2 so as to rotate the rod 2 around its rod axis T to allow the screwing / unscrewing of the first end 2A. The clamping member 7 is preferably formed at the second end 2B. In this example, the clamping member 7 is configured to cooperate with a tightening tool, for example, a tightening wrench or a screwdriver / bolter B ([Fig.5]). Preferably, the clamping member 7 has a polygonal shape, in particular, hexagonal. Preferably, the clamping member 7 is welded to the rod 2 or derived from material from the latter.

[0059] An example of use will be presented with reference to [Fig.5]. In this example, the hips B1, B2 are positioned opposite each other and the receiving orifice O2 is aligned with the introduction orifice O1 along an axis XE.

[0060] In this example, the operator is located in front of the introduction hip B1 and no operator is positioned between the hips B1, B2.

[0061] The method comprises a step consisting of introducing the first threaded end 2A of the rod 2 into the insertion orifice 01 of the insertion hip B1 in a front-to-rear movement, so as to successively pass through the insertion orifice 01 and the receiving orifice 02 of the protective member 3 extending between the formwork faces F1, F2.

[0062] Upon insertion, the rod axis T of the spacer device 1 is aligned with the axis XE in the spacer block 10 and is inserted into the through opening 012. Upon insertion, the seal 42 expands radially in the annular groove 41 of each seal device 4 so as to provide sealing. As illustrated in [Fig.5], the seal 42 is expanded more in the insertion hole 01 than in the receiving hole 02.

[0063] The method comprises a step of screwing the first threaded end 2A into the receiving hip B2 until the desired equipment is obtained. Preferably, the screwing is carried out using a wrench 5 connected to the tightening member 7. The method comprises a step of stopping the screwing when the tightening torque is optimal.

[0064] Several spacer devices 1 are preferably positioned between the hips B1, B2 so that the wall to be formed has the correct thickness.

[0065] A hardening material such as concrete can then be injected into the formwork delimited by the formwork hips B1, B2. The rod 2 advantageously allows the concreting forces to be taken up. Once the concrete has set, the spacer devices 1 can be removed by an operator located in front of the introduction formwork BL. The sealing devices 4 prevent any circulation of concrete outside the formwork.

[0066] The method comprises a step of unscrewing the first threaded end 2A of the rod 2, from the introduction form BL This step is preferably carried out by rotating the front end 2B (clamping member 7) by means of a bolter B. Due to its flared shape, the protection member 3 can be removed in a practical manner by horizontal translation along the axis XE. The method comprises a step of removing the rod 2 successively from the receiving orifice 02 and from the introduction orifice 01 by a backward to forward movement from the introduction form BL Thus, an operator can carry out all the manipulations from the Bl introductory formwork. This is more practical and increases safety. An operator is no longer forced to position himself between two forms or on the side of a formwork located near the void.

[0067] The shape of the sealing devices 4 allows for practical stripping of the formwork panels B1, B2 from the concrete wall.

Claims

Claims

1. Formwork panel comprising a formwork face (Fl) comprising at least one passage orifice (01) configured to receive a spacer device (1), formwork hip characterized in that it comprises at least one sealing device (4) configured to be mounted in an attached manner to a periphery of the passage orifice (01), the sealing device (4) comprising a support member (40) comprising an annular groove (41) in which is mounted an O-ring (42) with an expansion clearance (A), the O-ring (42) comprising an internal diameter configured to expand between a minimum diameter of between 16mm and 26mm and a maximum diameter of between 23mm and 33mm.

2. Formwork bench according to claim 1 wherein the sealing device (4) comprises a locking member (49) configured to cooperate with the support member (40) in order to tighten the sealing device (4) on either side of the passage orifice (01).

3. Formwork bench according to one of claims 1 to 2 in which the sealing device (4) is mounted in a removable manner.

4. Formwork bench according to one of claims 1 to 3 in which the support member (40) extends projecting from the formwork face (F1).

5. Formwork bench according to one of claims 1 to 4 in which the support member (40) comprises a body in which the annular groove (41) is formed, the body comprising an outer surface (43) of flared shape, preferably frustoconical.

6. Formwork bench according to one of claims 1 to 5 in which the support member (40) comprises a radiated edge (44).

7. Assembly of a front formwork panel according to one of claims 1 to 6, designated introduction panel (B1), and of a rear formwork panel according to one of claims 1 to 6, designated reception panel (B2), positioned opposite each other for the formwork of a wall, the assembly comprising a spacer device (1) mounted in the passage holes (01, 02) of the formwork hips (B1, B2), the spacer device (1) comprising: • A rod (2) extending longitudinally along a rod axis (T) oriented from front to rear, the rod (2) comprising a first threaded end (2A) configured to be screwed in the receiving bench (B2) and a second end (2B) configured to be handled by an operator from the introduction bench (Bl), • At least one protective member (3) mounted on the rod (2) and configured to extend between the formwork faces (F1, F2), the protective member (3) comprising a main body (30) of flared shape cooperating with the sealing devices (4) of the formwork hips (B1, B2).

8. A method of using an assembly according to claim 7, the method comprising a step of: • Insert the first threaded end (2A) of the rod (2) into the insertion orifice (01) of the insertion formwork (Bl) in a front-to-rear movement, so as to successively pass through the passage orifice (01) of the insertion formwork (Bl) and the passage orifice (02) of the receiving formwork (B2), the protective member (3) extending between the formwork faces (Fl, F2), the O-ring (42) of the sealing device (4) mounted in the passage orifice (01) of the insertion formwork (Bl) is more radially expanded than the O-ring (42) of the sealing device (4) mounted in the receiving orifice (02).

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