FR3062667A1 - DEVICE FOR FIXING A POTELET - Google Patents

Abstract

Device (1) for fixing a post on a slab formwork support beam. Said device (1) is provided with a base (6) which comprises: - a first receiving housing (20) receiving post, adapted to receive a post by embedding at a first height (H1) of a bearing surface (6a) of the base (6) in an axial direction (VV), - a second receiving housing (21) of the post, adapted to receive a post by embedding at a second height (H2) of the bearing surface (6a) of the base (6) in the axial direction (VV). The second height (H2) is greater than the first height (H1).

Description

(57) Device (1) for fixing a post to a beam of a slab formwork support structure. Said device (1) is provided with a base (6) which comprises:

- A first housing (20) for receiving a post, capable of receiving a post by embedding at a first height (H1) of a bearing surface (6a) of the base (6) in an axial direction (VV) ,

- A second housing (21) for receiving a post, capable of receiving a post by embedding at a second height (H2) of the bearing surface (6a) of the base (6) in the axial direction (V-V).

The second height (H2) is greater than the first height (H1).

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705 l-IFDEP.docx i

The present invention relates to the field of safety on building sites, and more particularly relates to a device for fixing a post on a beam of slab formwork support structure.

The slabs of a building are generally obtained by formwork using a slab formwork support structure. In particular, the slab formwork support structure comprises horizontal beams forming a trellis on which are generally placed plates (plywood for example) on which the concrete is poured. To prepare the concrete pouring, operators stroll on the slab formwork support structure. It is therefore necessary to secure the periphery thereof by means of barriers limiting the risk of an operator falling.

To do this, posts and attaches to posts on some of the horizontal beams, for example by means of the device described in document FR 2 987 857 A1. This device comprises a frame intended to surround a beam section, said frame comprising receiving means intended to receive by fitting the lower end of a post. Clamping means make it possible to hold the frame fixedly on the beam. The receiving means of this device comprise a first post receiving housing and a second post receiving housing located at the same height of a base intended to come to bear on the top of a beam. Each reception accommodation receives a post with two separate barriers.

A similar device is described in document WO 02/38887 A1, with a base intended to come to bear on the top of a beam. The reception means of this device, however, only include a single post reception housing.

Certain slab formwork structures sometimes include two sets of intersecting beams, the beams of the second set resting on the beams of the first set. Plates on which the concrete is poured and on which the operators stroll are placed on top of the second set of beams.

For reasons of economy and interchangeability, the posts are in principle all the same length.

When, on a first side of the slab formwork structure, the posts of the barrier are fixed on the beams of the first set, the posts of the barrier on the two sides adjacent to the first side are fixed on the beams of the second set. As a result, the free ends of the posts (and therefore the barrier) fixed to the beams of the second set are

7051-lFDEP, docx terminate, opposite the work surface (defined by the plates on which the concrete is poured) on which the operators wander, at a height which is greater than the height at which the ends terminate free of the posts (and therefore the barrier) fixed on the beams of the first set. This difference in height is harmful for good operator safety.

To resolve this specific technical problem, a device is proposed for fixing a post to a beam of slab formwork support structure, said device being provided with a base which comprises:

- a first post receiving housing, capable of receiving a post by embedding at a first height of a support surface of the base in an axial direction,

- A second post receiving housing, capable of receiving a post by embedding at a second height from the support surface of the base in the axial direction, the second height being greater than the first height.

The difference in height provided by the first and second post receiving housings makes it possible to partially or even completely compensate for the difference in height between the beams of the first and second sets of beams, and therefore the difference in level between the free ends ( and therefore the barrier) of the corresponding posts. Operator safety is thus improved.

Preferably, the second height can be about 10 cm to about 20 cm higher than the first height, preferably about 15 cm higher.

The device can optionally include a frame intended to surround a section of beam. When installing such a device on a beam, it is then necessary to engage the frame around a first free end of the beam, then to slide it on the beam in the direction of the opposite end of the beam. To do this, the operator is obliged to stand at the edge of the slab formwork support structure, or even to lean outside the slab formwork support structure, which is dangerous since no barrier is not yet in place.

To reduce the risk of an operator falling during the installation of a barrier at the periphery of a slab formwork support structure, it can be provided that, in said frame intended to surround a section of beam, at at least two successive elements constituting the frame are secured to each other by reversible connecting means so as to be able to be selectively

705 f-lFDEP.docx separated to form in the frame a lateral opening of width adapted to allow the lateral insertion of the beam in the frame.

To put such a device on a slab formwork support beam, the operator can open the frame to place it around the beam, then close it before fixing it in good place on the beam.

The operator does not need to reach the free end of the beam to do this. It can remain safe in an area set back from the edge of the slab formwork support structure.

Preferably, the constituent elements of the frame can be connected to each other in series inseparably on either side of the reversible connecting means.

This limits the risk of loss of components of the frame, and in particular the risk of a fall of some of them which could injure operators.

Advantageously, the framework can include:

- said base comprising a support surface extending in a foreground,

- a mounting flange provided with first and second through holes,

- a first and a second threaded rod connecting the base and the fixing flange being respectively engaged in the first and second through holes of the fixing flange to form said frame,

- clamping means allowing a clamping of the beam between the support surface of the base and the fixing flange.

The frame thus has a simple structure making it possible to ensure satisfactory and very uniform (in particular symmetrical) tightening of the beam between the base and the fixing flange.

Advantageously, it can be provided that:

- the first threaded rod extends in a first axial direction away from the support surface from a first end to a second end, and is integral with the base at its first end,

- the reversible connection means comprise on the base a threaded housing extending in a second axial direction substantially parallel to and away from the first axial direction,

- the second threaded rod extends in a third axial direction between a first end and a second end intended to be received by screwing in the threaded housing,

- the clamping means include:

A nut adapted to cooperate by screwing with the first threaded rod,

7051-IFDEP.docx • at the first end of the second threaded rod, a handle allowing the second threaded rod to move in rotation in the third axial direction.

To avoid accidental losses of certain constituent elements of the frame, it can preferably be provided that:

- the nut is captive on the first threaded rod,

an intermediate shoulder is formed between the first and second ends of the second threaded rod,

the first through hole has a cross section having at least one dimension smaller than the dimensions of the cross section of the nut,

- The second through hole has a cross section having at least one dimension smaller than the dimensions of the cross section of the intermediate shoulder and the dimensions of the handle.

Advantageously, the intermediate shoulder can be constituted by an attached washer and fixed on an intermediate section of the second threaded rod, preferably by welding.

Preferably, the nut can be made captive on the first threaded rod in a reliable and simple manner by a shoulder formed on the first threaded rod in the vicinity of its second end.

Advantageously, the first through hole and / or the second through hole can receive the first and second threaded rods with a radial clearance allowing an oblique orientation of the first and third axial directions. An oblique orientation of the first and third axial directions promotes easy engagement of the beam in the side opening in the frame.

Preferably, the first through hole and / or the second through hole may be an oblong hole.

The oblong nature of the first through hole and / or of the second through hole simultaneously allows an oblique orientation of the first and third axial directions and an easy adjustment of the frame to the width of the beam.

Advantageously, when the frame is assembled, the first threaded rod and the second threaded rod can be transversely spaced from each other at a minimum distance of between approximately 8 cm and approximately 12 cm, preferably greater than 10 cm. The frame is thus compatible with the majority of slab formwork support beams existing on the market.

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According to another aspect, there is proposed a method of fixing a device for fixing a post to a beam of slab formwork support structure, said device comprising a frame intended to surround a section of said beam, and in which at least two successive elements constituting the frame are secured to one another by reversible connecting means so as to be able to be selectively separated to form in the frame a lateral opening of width adapted to allow the introduction of the beam in the frame, said method possibly comprising the following steps:

a) separating two successive elements constituting the frame by means of the reversible connecting means so as to provide a lateral opening in the frame,

b) engaging the beam in the frame through said lateral opening,

c) reforming the frame around the beam by joining together the two successive elements constituting the frame by means of reversible connection means.

During such a process, the operator does not need to reach the free end of the beam. It can remain safe in an area set back from the edge of the slab formwork support structure.

According to another aspect of the present invention, it is proposed the use of a device for fixing a post on a beam in a slab formwork structure comprising two sets of intersecting beams, the beams of the second set resting on the beams of the first set, characterized in that:

- if the base is fixed in abutment on a beam of the first set of beams, a post is engaged in the second receiving housing,

- If the base is fixed in abutment on a beam of the second set of 25 beams, we engage said post in the first receiving housing.

Other objects, characteristics and advantages of the present invention will emerge from the following description of particular embodiments, given in relation to the attached figures, among which:

- Figure 1 is a perspective view of a particular embodiment of the device according to the invention for fixing a post on a beam of slab formwork support structure;

- Figure 2 is a front view of the device of Figure 1, during installation on a beam of slab formwork support structure;

- Figure 3 is a front view of the device of Figure 1, after installation on a beam of slab formwork support structure;

- Figure 4 is a side view of the device of Figure 3, with a post and a barrier installed at a first height;

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- Figure 5 is a side view of the device of Figure 3, with a post and a barrier installed at a second height;

- Figure 6 is a side view of a slab formwork structure comprising two sets of intersecting beams.

In FIGS. 1 to 6 is illustrated a particular embodiment of the device 1 for fixing a post 2 on a beam 3 of the slab formwork support structure 29.

It can be seen more particularly in FIGS. 1 to 3 that the device 1 comprises a frame 5 intended to surround a section of said beam 3. The frame

5 comprises four constituent elements 6 to 9. Two successive elements 6 and 9 constituting the frame 5 are secured to one another by reversible connecting means 10 so as to be able to be selectively separated to form in the frame 5 an opening lateral 11 of width adapted to allow the introduction of the beam 3 in the frame.

More specifically, the frame 5 includes:

- a base 6 with support surface 6a extending in a first plane P1,

- a fixing flange 8 provided with a first 12 and a second 13 through holes,

a first 7 and a second 9 threaded rods connecting the base 6 and the fixing flange 8 while being respectively engaged in the first 12 and second 13 through holes of the fixing flange 8 to form said frame 5,

- Clamping means 14 for clamping the beam 3 between the support surface 6a of the base 6 and the fixing flange 8.

The first threaded rod 7 extends in a first axial direction l-l away from the support surface 6a from a first end 7a towards a second end 7b, and is integral with the base 6 at its first end 7a,

the reversible connection means 10 comprise on the base 6 a threaded housing 15 extending in a second axial direction ll-ll substantially parallel to and away from the first axial direction l-l,

the second threaded rod 9 extends in a third axial direction III-III between a first end 9a and a second end 9b, and is intended to be received by screwing into the threaded housing 15,

the clamping means 14 comprise:

A nut 16 adapted to cooperate by screwing with the first threaded rod 7,

7051-lFDEP.docx • at the first end 9a of the second threaded rod 9, a handle 17 making it possible to move the second threaded rod 9 in rotation in the third axial direction lll-lll.

For the sake of simplicity of representation in the figures, the first 7 5 and second 9 threaded rods are illustrated with a smooth outer surface. But they actually have external threads. The same applies to the threaded housing 15, the internal thread of which is not shown in FIG. 1.

In order to limit the risks of loss and accidental fall of elements 6 to 9 of the frame 5, the constituent elements 6 to 9 of the frame 5 are connected to each other in series inseparable on either side of the means of reversible link

10.

To do this, it is more particularly provided that the nut 16 is captive on the first threaded rod 7, which is achieved by means of a shoulder 18 formed on the first threaded rod 7 in the vicinity of its second end 7b.

The nut cannot thus be unscrewed until it disengages from the first threaded rod 7. And the first through hole 12 has a circular cross section with a diameter less than at least one dimension of the cross section of the nut

16. The fixing flange 8 is thus inseparable from the first threaded rod 7 while being engaged in free sliding on the latter between the nut 16 and the first end 7a.

There is also provided an intermediate shoulder 19 formed between the first 9a and second 9b ends of the second threaded rod 9. The second through hole 13 has an oblong cross section having a width less than the diameter of the circular cross section of the intermediate shoulder 19 and the diameter of the circular cross section of the handle

17. The fixing flange 8 is thus inseparable from the second threaded rod 9 while being engaged in free sliding on the latter between the handle 17 and the intermediate shoulder 19. The intermediate shoulder 19 is constituted by an attached washer and fixed on an intermediate section of the second threaded rod

9, preferably by welding.

The first through hole 12 has a diameter greater than the diameter of the first threaded rod 7, so that it receives the first threaded rod with a first radial clearance. The length of the oblong of the second through hole 13 is much greater than the diameter of the second threaded rod 9, so that the second through hole 13 receives the second threaded rod 9 with a second clearance radia !. One and / or the other of these radial clearances, taken in the direction of elongation of the fixing flange 8 (or in the transverse direction IV-IV which connects the first 12 and

705î-lFDEP „docx second 13 through holes), allow an oblique orientation of the first l-l and third lll-lll axial directions. The lateral opening 11 in the frame 5 can thus be easily dimensioned for reliable and rapid engagement of its beam 3 (see FIG. 2).

Satisfactory results have been obtained with:

- outside diameters of first 7 and second 9 threaded rods of 17 mm,

- a diameter of the first through hole 12 of 23 mm,

- a length of 39 mm and a width of 19 mm for the oblong of the second through hole 13.

The first 12 and second 13 through holes have a length of mm.

When the frame 5 is assembled, the first threaded rod 7 and the second threaded rod 9 are transversely spaced from each other at a minimum distance E (FIG. 3) of between approximately 8 cm and approximately 12 cm, preferably greater at 10 cm.

We see more particularly in Figures 1, 4 and 5 that:

- the base 6 comprises a first housing 20 for receiving post 2, capable of receiving a post 2 by fitting at a first height H1 of the bearing surface 6a of the base 6 according to a fourth axial direction VV (which is in this case parallel to the first axial direction ll),

- The base 6 comprises a second housing 21 for receiving post 2, capable of receiving a post 2 by embedding at a second height H2 from the bearing surface 6a of the base 6 in the fourth axial direction VV, the second height H2 being greater than the first height H1.

Good results have been obtained with a second height H2 greater by approximately 10 cm to approximately 20 cm at the first height H1, preferably greater by approximately 15 cm.

When a post 2 is inserted into the first receiving housing 20 (FIG. 4), its lower end bears on the base 6. The bottom of the grid

23 which is then put in place with the aid of the post 2 comes to be embedded in a groove 24 formed in the base 6.

When a post 2 is inserted into the second receiving housing 21 (FIG. 5), its lower end comes to bear on a stop 22. The stop 22 is here a bolt engaged transversely in the square section tube defining the second housing 21 reception. The bottom of the grid 23 which is then put in place using the post 2 comes to be embedded in a groove 25 provided by the tab 26 in L.

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The usefulness of the first 20 and second 21 reception housings is more particularly noticeable in FIG. 6.

In this figure is partially illustrated a slab formwork structure 29 comprising a first set 3 of beams 3 on which rests a second set 3b of beams 3. The beams 3 of the two sets 3a and 3b intersect.

On the beams 3 of the second set 3b, a working surface 27 is formed using plates 28.

The device 1 fixed to the beam 3 of the first set 3a receives a post 2 in its second housing 21, while the device 1 fixed to the beam 3 of the second set 3b receives a post 2 in its first housing 20.

The difference between the heights H2 and H1 (Figure 1) being close to the height H3 of the beam 3 of the second set 3b, the upper ends

2a of the two posts 2 are substantially situated at the same height H with respect to the working surface 27.

The grids 23 thus border the slab formwork structure, being substantially arranged at the same height over the entire periphery of the slab formwork structure 29, which improves user safety.

After its introduction into the first housing 20 or second housing 21 by at least one translational movement in the axial direction VV, the post 2 can be locked in said first housing 20 or second housing 21 to prevent any untimely extraction from said housing concerned 20 or 21. To do this, one can use various locking means such as a bayonet connection, a connection by a transverse pin or a connection by screwing.

The method of fixing the device 1 to a beam 3 will now be explained in connection with FIGS. 2 and 3.

If the frame 5 is closed, the operator begins, during a step a), by separating two successive elements 6 and 9 constituting the frame by means of the reversible connection means 10 so as to provide in the frame a lateral opening 11. In this case, the operator removes the second threaded rod 9 from the threaded housing 15.

The various elements 6 to 9 constituting the frame 5 being linked inseparably, there is no risk of fall or loss of one of them.

To provide a lateral opening 11 allowing even easier introduction into frame 5, the operator can tilt the first 7 and

7051-lFDEP, docx ίο second 9 rods threaded together, as illustrated in Figure 2 where the first l-l and third lll-III directions are oblique.

During a step b), the operator engages the beam 3 in the frame 5 through said lateral opening 11.

Then, during a step c), the operator reform the frame 5 around the beam 3 by resolidarisanî the two successive elements 6 and 9 constituting the frame 5 thanks to the reversible connecting means 10. In this case, the operator screwed in the second end 9b of the second threaded rod 9 into the threaded housing 15.

The operator then operates the nut 16 and the handle 17 until it comes to grip the beam 3 taken in vice between the base 6 and the fixing flange 8. We are then in the configuration illustrated in FIG. 3.

It should be noted that the specific technical problem of the difference in height between the posts located on two adjacent sides of a slab formwork structure is independent of the technical problem solved by the reversible connecting means 10 making it possible to provide a lateral opening 11 of sufficient width to allow the introduction of the beam 3 in the frame 5 of the device 1.

The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof contained in the field of claims below.

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Claims (14)

1 - Device (1) for fixing a post (2) on a beam (3) of slab formwork support structure (29), said device (1) being provided with a base (6) which comprises : - A first housing (20) for receiving a post (2), capable of receiving a post (2) by fitting at a first height (H1) of a bearing surface (6a) of the base (6) according to an axial direction (VV), a second housing (21) for receiving a post (2), capable of receiving a post (2) by fitting at a second height (H2) from the bearing surface (6a) of the base (6) according to the axial direction (VV), characterized in that the second height (H2) is greater than the first height (H1). 2 - Device (1) according to claim 1, characterized in that the second height (H2) is about 10 cm to about 20 cm greater than the first height (H1), preferably about 15 cm greater. 3 - Device (1) according to one of claims 1 or 2, characterized in that it comprises a frame (5) intended to surround a section of said beam (3), and in which at least two successive elements (6 , 9) constituting the frame (5) are secured to one another by reversible connecting means (10) so that they can be selectively separated to form in the frame (5) a lateral opening (11) of width adapted to allow the introduction of the beam (3) in the frame (5). 4 - Device (1) according to claim 3, characterized in that the elements (6-9) constituting the frame (5) are connected to each other in series inseparable on either side of the reversible connecting means (10). 5 - Device (1) according to one of claims 3 or 4, characterized in that the frame (5) comprises: - said base (6) comprising a support surface (6a) extending in a first plane (P1), - a fixing flange (8) provided with a first (12) and a second (13) through holes, - a first (7) and a second (9) threaded rod connecting the base (6) and the fixing flange (8) being respectively engaged in the first (12) and second (13) through holes of the flange fixing (8) to form said frame (5), - clamping means (14) allowing the beam (3) to be clamped between the bearing surface (6a) of the base (6) and the fixing flange (8). 7051-lFDEP.docx 6 - Device (1) according to claim 5, characterized in that: - The first threaded rod (7) extends in a first axial direction (ll) away from the bearing surface (6a) from a first end (7a) towards a second end (7b), and is integral the base (6) at its first end (7a), - the reversible connection means (10) comprise on the base (6) a threaded housing (15) extending in a second axial direction (ll-ll) substantially parallel to and away from the first axial direction ( ll), - the second threaded rod (9) extends in a third axial direction (III-III) between a first end (9a) and a second end (9b) intended to be received by screwing in the threaded housing (15), - the clamping means (14) include: • a nut (16) adapted to cooperate by screwing with the first threaded rod (7), • at the first end (9a) of the second threaded rod (9), a handle (17) for rotating the second rod threaded (9) in the third axial direction (lll-lll). 7 - Device (1) according to claim 6, characterized in that: - the nut (16) is captive on the first threaded rod (7), an intermediate shoulder (19) is formed between the first (9a) and second (9b) ends of the second threaded rod (9), - the first through hole (12) has a cross section having at least one dimension smaller than the dimensions of the cross section of the nut (16), - The second through hole (13) has a cross section having at least one dimension smaller than the dimensions of the cross section of the intermediate shoulder (19) and the dimensions of the handle (17). 8 - Device (1) according to claim 7, characterized in that the intermediate shoulder (19) consists of an attached washer and fixed on an intermediate section of the second threaded rod (9), preferably by welding. 9 - Device (1) according to one of claims 7 or 8, characterized in that the nut (16) is made captive on the first threaded rod (7) by a shoulder (18) formed on the first threaded rod ( 7) in the vicinity of its second end (7b). 10 - Device (1) according to any one of claims 5 to 9, characterized in that ie the first through hole (12) and / or the second through hole (13) receive the first (7) and second (9) rods threaded with clearance 7051-lFDEP.docx radial allowing an oblique orientation of the first (l-l) and third (lll-lll) axial directions. 11 - Device (1) according to claim 10, characterized in that the first through hole (12) and / or the second through hole (13) is an oblong hole. 12 - Device (1) according to any one of claims 5 to 11, characterized in that, when the frame (5) is assembled, the first threaded rod (7) and the second threaded rod (9) are transversely distant l 'from each other at a minimum distance (E) of between approximately 8 cm and approximately 12 cm, preferably greater than 10 cm. 13 - Method for fixing a device (1) according to any one of claims 3 to 12 on a beam (3) of slab formwork support structure (29), said method comprising the following steps: a) separating two successive elements (6, 9) constituting the frame (5) by means of the reversible connecting means (10) so as to provide in the frame (5) a lateral opening (11), b) engaging the beam (3) in the frame (5) through said lateral opening (11), c) reforming the frame (5) around the beam (3) by joining the two successive elements (6, 9) constituting the frame (5) by means of reversible connection means (10). 14 - Use of a device (1) according to any one of claims 1 to 12 in a slab formwork structure (29) comprising two sets (3a, 3b) of beams (3) intersecting, the beams (3) of the second set (3b) resting on the beams (3) of the first set (3a), characterized in that: - if the base (6) is fixed in abutment on a beam (3) of the first set (3a) of beams (3), a post (2) is engaged in the second receiving housing (21), - If the base (6) is fixed in abutment on a beam (3) of the second set (3b) of beams (3), said post (2) is engaged in the first receiving housing (20). 1/6 H2 18 I / 'III