EP1270845B1 - Safety walkway for shuttering device with adjustable curvature radius - Google Patents

Abstract

The safety platform for formwork (2) with an adjustable radius of curvature comprises circulation means adapted to the radius of curvature. The circulation means consist of a plate (13) comprising end elements (14,15) connected to the formwork by an articulated device and to a central element (16) by a pivoting connection allowing the platform to pass from folded to unfolded positions relative to the formwork and follow the formwork radius of curvature.

Description

The present invention relates to a security gateway deformable angularly to follow the profile of a formwork device and more particularly a shuttering formwork adjustable radius of curvature for concrete structures.

We know from the French patent FR-A-2665204 in the name of the applicant, safety gateways with a rectangular profile comprising a frame on which are articulated a guardrail and a deformable triangle, forming an articulated chair.

This safety gateway has a structure that allows it to be folded for handling or storage, either in isolation or on a formwork board.

We know from the French patent FR-A-2711705 , a shuttering device with adjustable radius of curvature on which is arranged, in addition, three independent gangways each associated with sheets to follow and adapt to different radii of curvature.

It is also known from the French patent FR-A-2747145 on behalf of the applicant, a formwork device forming a shuttering panel with an adjustable radius of curvature for the construction and construction of curved walls.

It is easy to understand that the berms with an adjustable radius of curvature must receive, like the right berms, safety gangways for the operators' circulation.

As the straight gangways can not adapt to the curved profile of the shuttering panels with adjustable radius of curvature, it was necessary to develop and build a new security gateway that is capable of following all the radii of curvature.

The security gateway for shuttering formwork with adjustable radius of curvature according to the present invention comprises circulation means which are arranged to fit and follow the radius of curvature of the shuttering formwork.

The security gateway according to the present invention comprises circulation means which are arranged on the one hand to pass from a folded position to a unfolded position relative to the shuttering form and secondly, to adapt and follow the radius of curvature of the shuttering formwork.

The safety gateway according to the present invention comprises circulation means which consist of a plate comprising extreme elements which are able on the one hand to be connected to the formwork box by an articulated device and secondly connected to a central element, by a pivoting connecting device, to allow the bridge to move from a folded position to an unfolded position relative to the formwork and to follow the radius of curvature of said shuttering formwork.

The security gateway according to the present invention comprises extreme elements which consist of a plate secured to a first cross member carrying the articulated device and a second cross member, parallel to the first, and having in its extension a connecting device. .

The security gateway according to the present invention comprises extreme elements whose connecting device consists of a rod disposed in the extension of the cross member and a sleeve provided at the free end of said rod.

The security gateway according to the present invention comprises a central element which consists of a plate having in its middle a pivoting door allowing access to the operators on the plate.

The security gateway according to the present invention comprises a central element whose connecting device consists of holes, respectively receiving an axis which cooperates with the sleeve of the connecting device of the end elements.

The safety gateway according to the present invention comprises end elements whose cross is secured to stirrups for fixing and pivoting guardrails.

The security gateway according to the present invention comprises a plate provided with a central element whose outer profile is provided to come on the one hand bearing on the end elements and on the other hand partly cover the surface of said end members.

The security gateway according to the present invention comprises below the central element a ladder.

• Figure 1 est une vue de coté illustrant la passerelle de sécurité suivant la présente invention en position dépliée, sur une banche de coffrage à rayon de courbure réglable.
• Figure 2 est une vue de face représentant la passerelle de sécurité suivant la présente invention en position dépliée sur une banche de coffrage à rayon de courbure réglable.
• Figures 3, 4 et 5 sont des vues montrant les éléments constitutifs du plateau de la passerelle de sécurité suivant la présente invention.
• Figure 6 est une vue de dessus montrant la passerelle de sécurité selon par exemple une première position courbée.
• Figure 7 est une vue de dessus montrant la passerelle de sécurité selon par exemple une deuxième position courbée et inverse à la première.

The following description with reference to the accompanying drawings, given by way of non-limiting example, will better understand the invention, the characteristics it has and the advantages it is likely to provide:

• Figure 1 is a side view illustrating the safety gateway according to the present invention in the unfolded position, on a shuttering formwork adjustable radius of curvature.
• Figure 2 is a front view showing the security gateway according to the present invention in unfolded position on a shuttering formwork adjustable radius of curvature.
• Figures 3 , 4 and 5 are views showing the constituent elements of the safety gate tray according to the present invention.
• Figure 6 is a top view showing the security gateway for example a first curved position.
• Figure 7 is a top view showing the security gateway for example a second curved position and inverse to the first.

We have shown in figures 1 and 2 a safety gateway 1 in the unfolded position and permanently fixed on a shuttering formwork 2 with adjustable radius of curvature.

The shuttering form 2 is shown in the rest position, that is to say before bending and comprises a formwork sheet 3 which is integral with a set of support beams 4.

The formwork box 2 comprises, for example, a set of beams 4 which consists of four identical and parallel holding beams, each having a truncated point V-shaped profile.

The support beams 4 are regularly spaced across the width and arranged along parallel generatrices over the entire height of the formwork sheet 3.

The support beams 4 are interconnected by means of adjustment 5 in length extending transversely to said beams and connecting them in pairs in the upper and lower part of the formwork box 2.

The adjustment means 5 consist of identical angles 6 which are fixed on the truncated points and perpendicular to the support beams 4.

The angles 6 of the adjustment means 5 are connected to each other by screw jacks 7 which are either spaced apart or are tightened according to the bending radius of curvature that the formwork box 2 must present.

Also, the angles 6 are connected opposite each screw jack 7 to the shuttering panel 3 by other screw jacks 8, which make it possible to improve the adjustment of the radius of curvature of said shuttering sheet at level of its free ends.

The formwork box 2 comprises clamping means 9 which are arranged inside each holding beam 4, for the introduction of a bending template 10 in the upper and lower part of said box.

Each clamping means 9 consists of a metal bead 11 acting as a clamping abutment which slides parallel to and above or below each support beam 4 (FIG. figures 6 and 7 ).

The shuttering tray 2 comprises between two pairs of support beams 4 longitudinal members 12 which are fixed on the adjustment means 5 provided in the lower and upper part of said form.

The security gateway 1 comprises circulation means which consist of a plate 13 which brings from a folded position and parallel to the formwork box to an unfolded position and perpendicular to said box.

The plate 13 consists of two end elements 14 and 15 and a central element 16 which adapt and move relative to each other to follow the curved profile of the formwork box 2.

Each end element 14 and 15 is fixed on the spar 12 being in correspondence by a hinge-type device 17, allowing the plate 13 to tilt or pivot around this hinge to move from a folded position parallel to the box of formwork 2, in an unfolded position and perpendicular to said form.

In figures 3 and 4 the end elements 14, 15 of the plate 13 are shown, which consist respectively of a plate 18, 19 whose external profile is determined according to the dimensions of the formwork box 2

The plate 18, 19 of the end members 14, 15 is integral with reinforcing crosspieces 20 and 21, parallel to one another and respectively carrying the hinge devices 17 and stirrups 22, for fixing and pivoting. guards 23 and 24 of the bridge 1.

The reinforcing crosspieces 20 and 21 are provided in a direction of greater length than that provided for the plates 18 and 19 and more particularly in the direction of the central element 16 of the plate 13.

The reinforcing beam 21 of each end element 14 and 15 is extended by a connecting device which consists of a rod 25 integral at its free end with a sleeve 26 forming the pivot axis of the plate 13 so that the latter follow the curved profile of the shuttering box 2.

The reinforcing beam 20 of each end element 14 and 15 is extended by a guiding device which consists of a rod 41 integral at its free end with a sleeve 42 forming a pivoting and guiding axis of the plate 13.

Each end element 14 and 15 comprises an extension 43, 44 which slides opposite the connecting and guiding devices and relative to the plates 18 and 19. This extension 43, 44 is intended, when the plate 13 has a particular curvature , to enlarge each end element 14 and 15 at each end of the gateway 1.

In figure 5 , we have shown the central element 16 of the plate 13 which consists of a plate 27 whose outer profile is determined according to the dimensions of the formwork box 2 and complementary to that of each end element 14, 15.

The plate 27 comprises in its middle an articulated door 28 which allows access to the operators when the plate 13 is in the unfolded position.

The central element 16 comprises, opposite the hinges 29 allowing the pivoting of the hatch 28, two parallel holes 30 and 31 with cylindrical or oblong profile, formed in the plate 27 and intended to receive respectively a connecting device formed of an axis 32 which cooperates with each sleeve 26 of the end elements 14 and 15.

The central element 16 comprises, in the plate 27 and between the hinges 29 allowing the pivoting of the hatch 28, two parallel holes 45 and 46 with cylindrical or oblong profile, intended to respectively receive a guide device formed of an axis 47 which cooperates with each sleeve 42 of the end elements 14 and 15.

Note that the holes 45 and 46 are directed in a direction that is perpendicular to that provided for the holes 30 and 31.

When the plate 13 is assembled, it is noted that the central element 16 bears on the plates 18 and 19 of the end elements 14, 15 in order to partially cover them, while the holes 30 and 31 allow, by means of the axes 32 , to make a pivotal connection between the central element 16 and each of the end elements 14 and 15.

It should be noted that the security gateway 1 comprises, below the central hatch 28, a ladder 33 enabling the operators to climb on said gateway. The ladder 33 is hooked on the bridge 1 when the latter is in the unfolded position and fixed to the latter by means of a reinforcing bar 34.

It will be noted that the crosspieces 21 of each end element 14 and 15 comprise, between the stirrups 22, for the establishment of the bodyguards 23 and 24, a U-shaped connection 35 for fixing a crosspiece 36 which comes, at the opposite end, attach to the corresponding spar 12. This crosspiece 36 allows the establishment and fixing of props 37 and 38 according to the desired configuration.

It is found, when using a strut 38, that it is connected by a foot plate 39 to a brace 40 which is fixed on one of the corresponding longitudinal members 12.

In Figure 6 the elements 14, 15 and 16 have been shown to move relative to each other during the bending of the formwork board 2 and more particularly when the formwork sheet 3 has a convex radius of curvature.

Thus, during the bending of the shuttering form 2, it is noted that the end elements 14 and 15 follow the deformation of the formwork and deviate in a curved direction of the central element 16 by pivoting about the axes 32.

It is noted that the bending radius of the shuttering box 2 can not be greater than the overlap surface of the plate 28 of the central element 16 on the plates 18 and 19 of each end element 14 and 15.

The end elements 14 and 15 are then immobilized by clamping devices with respect to the central element 16.

In Figure 7 the elements 14, 15 and 16 have been shown to move relative to each other during the bending of the formwork board 2, and more particularly when the formwork sheet 3 has a concave radius of curvature.

Thus, during the bending of the formwork box 2, it is noted that the end elements 14 and 15 follow the deformation of the formwork box and approach in a curved direction of the central element 16, pivoting about the axes 32.

In this position, it can be seen that the central element 16 covers most of the plates 18 and 19 of each end element 14 and 15 of the bridge 1.

The end elements 14 and 15 are then immobilized by clamping devices with respect to the central element 16.

Claims (5)

1. Safety walkway for shuttering panel (2) having an adjustable radius of curvature, said walkway comprising adjustment means (5) for the deformation to a given radius of curvature of a shuttering sheet (3), said walkway comprising traffic means adjustable to the different radii of curvature of said shuttering panel (2), and said walkway being such that the traffic means consist of a platform (13) comprising:

   • a central element (16) connected to extreme elements (14, 15) in such a way that said central element (16) rests on the extreme elements (14, 15), partially covering their surfaces,

   said walkway being characterized in that it also comprises:

   • an articulated device (17) forming a hinge for connecting the extreme elements (14, 15) to the shuttering panel (2),

   • a pivoting connection device comprising on each extreme element (14, 15) a rod (25) attached at its free end to a sleeve (26) and on the central element (16) to holes (30, 31) which each take a pin (32) engaging with the corresponding sleeve (26) to allow the walkway (1) to be moved from a folded position to an unfolded position with respect to the shuttering panel (2) and to follow the radius of curvature of said shuttering panel as it is bent,

   • and extreme elements (14, 15) consisting partly of a board (18, 19) attached to a first cross member (20) supporting the articulated device (17) and partly of a second cross member (21) parallel to the first and comprising, continuous with itself, the rod (25) attached to the sleeve (26).
2. Safety walkway according to Claim 1, characterized in that the central element (16) consists of a board (27) comprising a pivoting trapdoor (28) in its middle to allow operators to access the platform (13).
3. Safety walkway according to Claim 1, characterized in that the cross member (21) of each extreme element (14, 15) is attached to brackets (22) for the fixing and pivoting of guard rails (23, 24).
4. Safety walkway according to Claim 1, characterized in that it has a ladder (33) underneath the central element (16).
5. Safety walkway according to Claim 1, characterized in that each extreme element (14, 15) includes an extension (43, 44).

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