WO2012069713A1 - Mast having controlled weakening, in particular for a signaling element and method for producing same - Google Patents

Mast having controlled weakening, in particular for a signaling element and method for producing same Download PDF

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Publication number
WO2012069713A1
WO2012069713A1 PCT/FR2011/000615 FR2011000615W WO2012069713A1 WO 2012069713 A1 WO2012069713 A1 WO 2012069713A1 FR 2011000615 W FR2011000615 W FR 2011000615W WO 2012069713 A1 WO2012069713 A1 WO 2012069713A1
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WO
WIPO (PCT)
Prior art keywords
barrel
weakening zone
fusible
pole
controlled weakening
Prior art date
Application number
PCT/FR2011/000615
Other languages
French (fr)
Inventor
Gérard BRUNOT
Daniel Mutricy
Original Assignee
Petitjean
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petitjean filed Critical Petitjean
Publication of WO2012069713A1 publication Critical patent/WO2012069713A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
    • E01F9/631—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact
    • E01F9/635—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact by shearing or tearing, e.g. having weakened zones

Definitions

  • the present invention relates to a mast with controlled weakening, said fusible mast, especially for road signs, billboards or other.
  • the present invention also relates to a method for obtaining such a fuse pole.
  • the fixing means comprise a base in the form of a support plate and adapted to allow the attachment of the assembly, for example on a plate provided on the ground.
  • the plate is for example formed by the upper face of a foundation provided in the ground.
  • the connection between the post and the base can be provided by threaded rods anchored in the foundation.
  • the mast comprises a portion intended to be buried on a sufficient driving height, for example at least 60 cm.
  • the portion intended to be buried defines at least part of the fixing means.
  • the end of the post may be provided with an anti-recess plate to limit the variation of the depth of penetration of the mast.
  • the base plate and the anti-sink plate Implant configurations previously described may be obtained by molding, forging, stamping or any other suitable method.
  • the base and the anti-recess plate can be secured to the mast by bolted jointing, welding, crimping, gluing or any other suitable technique.
  • these masts which are an integral part of the urban development, nonetheless constitute fixed obstacles, punctual, aggressive, which increase the risk of collision and therefore the dangerousness of traffic .
  • the term "fixed obstacle” means any rigid element of a height, in relation to the running surface of road vehicles, greater than 20 cm with a maximum resistant moment greater than 570 daN.m. Due to the dangerous nature of fixed obstacles, the construction and installation of these masts are regulated.
  • the technical guide entitled “Treatment of lateral obstacles on main and off-road roads” published in 2002 by SETRA specifies in particular the rules to be respected for fixed obstacles, namely:
  • Fusible poles are intended in particular to avoid, in the event of a collision between a vehicle and the fusible mast, that the passengers are subjected to a deceleration too fast and therefore dangerous.
  • the EN 12767 standard entitled “Passive Safety of Road Equipment Support Structures - Requirements and Test Methods” describes a a method that allows, on the basis of standard real impact tests, the evaluation and classification of masts, as appropriate, in the category of masts without energy absorption
  • Some known fusible poles include in particular a shaft coupled to a sole by a "fragile" mechanical connection intended to break in particular in case of collision between a vehicle and the fusible mast.
  • This "fragile" type mechanical connection is for example obtained by means of a coupling structure comprising mechanical connection pieces, a connection sleeve bonded for example between two portions of the post, a system of special deformable washers, a base with a spherical joint pivotable.
  • mechanical links require additional pieces to couple the barrel and the flange or base to its attachments in the ground. This solution is therefore complicated to implement and expensive.
  • the present invention aims to remedy these drawbacks by proposing an alternative fuse pole including signal element, having no part or additional mechanical system and therefore easy to implement.
  • the present invention also aims to provide a simple and reproducible manufacturing process for obtaining reliable fusible masts.
  • the invention relates to a fuse mast particular for road signaling element comprising a longitudinal shaft provided in at least one end "of fixing means for fixing the fuse mast on a support so that the support and the fusible mast share a plan transverse junction.
  • This fusible mast is remarkable in that the barrel comprises at least one controlled weakening zone distinct from the fastening means, at which the structure of the material is different from that of the portions of the barrel adjacent to said controlled weakening zone.
  • the controlled weakening zone is formed without material removal and has a maximum peak moment resistance lower than that of the barrel portions adjacent to the controlled weakening zone, the controlled weakening zone being provided on the periphery of the and being able, in the event of a lateral impact of a predetermined intensity on the shaft, to favor the deformation and then the rupture of the shaft at the level of the zone of controlled weakening, without preferential orientation, to allow at least the deformation of a portion of the barrel relative to the fastening means.
  • the fuse pole according to the invention is therefore simple to achieve.
  • the barrel of a zone located on the periphery of the. barrel of the same material as the barrel, but having undergone a treatment such that the physical and mechanical properties of the local zone are different from the physical and mechanical properties of the adjacent portions of the barrel that surround it (in particular having a lower maximum resistant moment to that of the portions).
  • the barrel it is therefore understood that it is not necessary to resort to additional realization steps, in particular the step of removing material to weaken the barrel at the level of the controlled weakening zone . In other words no recess (light or slot) is made at the periphery of the barrel to weaken said area.
  • the height of the predetermined controlled weakening zone is preferably between 10 and 50 mm.
  • the median zone of the controlled weakening zone is located at a distance from the transverse junction plane less than or equal to 200 mm.
  • the fastening means comprise a transverse base forming at least partly the fastening means and coupled to the barrel by a mechanical connection, the lower face of the base defining the transverse junction plane when the fuse pole is in its normal use.
  • the mechanical connection is for example a bolted connection, a weld bead, a crimping, a bonding or any other suitable mechanical connection.
  • the barrel advantageously comprises a portion intended to be buried in the ground, this portion defining at least partly the fastening means, the intersection between the ground and the barrel being intended to define the transverse junction plane when the fusible mast is in its normal use.
  • the zone of controlled weakening is continuous. It is thus understood that the maximum resistance moment (which is less than that of the zones adjacent to the zone) is the same at any point of said controlled weakening zone.
  • the drum is for example made in one of the materials selected from the group consisting of aluminum alloys, hardened steels, high yield strength steels.
  • the invention also relates to a method for obtaining a fusible pole, in particular for a road signaling element, during which a longitudinal shaft coupled to fastening means for fixing the fusible pole on a support is produced so that the support and the fusible mast share a transverse junction plane.
  • This process is remarkable in that at least one controlled weakening zone is produced on the barrel that is distinct from the fastening means at which the structure of the material is modified so that the zone of controlled weakening is achieved.
  • the controlled weakening zone being provided on the periphery of the barrel and being adapted, in case of side impact of a predetermined intensity on the barrel, to promote the deformation and rupture of the barrel at the controlled weakening zone, without preferential orientation, to allow at least the deformation of a portion of the barrel relative to the fastening means.
  • the zone of weakening controlled by local heat treatment is carried out, without addition of material, by means of a heat treatment device making it possible to raise locally the temperature of the drum, at the level of the weakening zone controlled, beyond the transformation temperature of the material forming the drum.
  • the region of weakening controlled by local melting, without input and without removal of material is carried out by means of a melting device making it possible to locally raise the temperature of the drum, at the level of the zone of controlled weakening, beyond the transformation temperature of the material forming said barrel.
  • the shaft locally at the level of the weakening zone, does not undergo any treatment or machining process, whatever it may be. We do not remove material and we do not add part or additional mechanical system.
  • the methods used consist in plastically deforming the material locally at the weakening zone to obtain the desired moment of resistance.
  • FIG. 1 is an exploded elevational view of a portion of the fuse pole according to the invention.
  • FIG. 1 is a top view of the fuse pole of Figure 1;
  • FIG. 3 is a view similar to Figure 1 of the fuse mast according to the invention after a side impact, the zone of weakness has broken in part and being in part deformed to allow the inclination of a portion of the fuse pole partially ripped relative to its base.
  • fusible mast is used to designate two types of categories of masts with controlled weakening, called fusible poles, which meet different regulations.
  • a first category concerns fuse poles not classified as a "fixed obstacle” which do not constitute, legally speaking, fixed obstacles in relation to road vehicles and are considered as non-hazardous.
  • These unclassified fuse poles "fixed obstacle” are for example used as:
  • a second category concerns fusible masts classified as "fixed obstacle” or so-called passive masts.
  • the fusible poles of this second category have dimensions greater than those of the first category and offer greater flexural strength (greater than 570 daNm).
  • These fusible masts classified "fixed obstacle” are for example used as:
  • the fuse pole 1 comprises a longitudinal shaft 2, coupled to fixing means 3.
  • the term "shaft” is understood to mean an elongate hollow element, but can be full also.
  • the barrel 2 has a circular section of longitudinal axis A and is cylindrical.
  • the barrel 2 has for example a diameter of 120 mm and a thickness of 3 to 4 mm.
  • the barrel may have a polygonal section. It can also be conical, or even have several variations in diameter along its length.
  • the barrel 2 is for example made of aluminum alloy, hardened steel, steel obtained by thermomechanical rolling or any other suitable material.
  • Materials sensitive to controlled weakening of the mechanical and physical properties resulting from heat treatment or melting are preferably selected.
  • alloys of aluminum capable of hardening by precipitation so-called hardening alloys
  • / or hardened by work hardening which have this particularity, in particular aluminum alloys of the 6000 series, are used.
  • Hardened-tempered, quenched hardened states are specially adapted. It is also possible to use hardened high tensile strength steels, such as in particular a high yield strength steel such as, for example, the S500 TM grade.
  • the barrel 2 comprises a base 3 forming the fastening means.
  • This base 3 is in the form of a substantially flat and square plate disposed substantially perpendicularly to the longitudinal axis A of the barrel 2.
  • the base 3 is traversed at its corners by orifices 6 allowing the passage of flanges. (not shown) attachment to a support (not shown).
  • the flanges are for example formed by threaded rods and the support comprises for example a mounting plate formed by the upper face of a foundation provided in the pavement.
  • the base 3 is connected to the shaft 2 by a mechanical connection 5 made by bolted jointing, welding, crimping, bonding or any suitable mechanical connection.
  • the base 3 is for example made of aluminum alloy, hardened steel or any other suitable material compatible with the assembly by welding with the barrel 2.
  • the base 3 can also be made of a material different from that used for the 2.
  • the fusible pole 1 thus formed is intended to be used according to the first configuration configuration previously described, namely above the ground, fixed to a support anchored in the ground.
  • the means for fixing the barrel comprise the base 3, the flanges (not shown) and the weld bead 5.
  • the support and the fuse pole 1 share the transverse junction plane P.
  • the shaft and the base are coupled by any other suitable means.
  • the barrel and the base can also be formed of a single piece.
  • the shaft is intended to be used according to the second configuration configuration previously described, namely partially buried ground.
  • one end of the barrel is intended to be buried in the ground. This end may or may not be provided with an anti-recess plate.
  • the fastening means of the fusible mast comprise in particular the portion of the drum intended to be buried and the anti- ⁇ depression plate when it is present.
  • the barrel may be provided with fastening means in a form different from those previously described.
  • the barrel 2 has a localized controlled weakening zone 4 obtained without removal of material. It has a maximum maximum resistance moment to the rest of the barrel 2 so that in case of lateral bias of a predetermined intensity on the barrel 2, the controlled weakening zone 4 promotes the inclination of the barrel 2 with a deformation of the barrel 2. one of its ends closest to the fastening means, more precisely in the example of the figures, its lower end.
  • the zone of controlled weakening 4 breaks, in the event of impact on the shaft, in part or in whole, and the shaft 2 is lying on the ground, torn off or not from its support so as not to constitute a fixed obstacle.
  • the entire barrel 2 has a resistant moment allowing it to withstand normal conditions of use, especially the wind, especially for fusible poles intended to support panels, traffic lights.
  • the zone of controlled weakening 4 has a maximum resistant moment less than that of the drum, in particular, at 570daN.
  • the controlled weakening zone 4 makes it possible, in the event of a lateral impact on the barrel 2, necessarily offset with respect to the controlled weakening zone 4, at a distance and an intensity such that the torque generated on the controlled weakening zone 4 is greater than 570daN, that the barrel 2 deforms or even breaks at the level of the zone 4. This shock is for example caused by the collision of a vehicle with the fuse pole 1.
  • the maximum resistance moment of the controlled weakening zone 4 is of course adapted according to the needs and in particular according to the destination of the fuse pole 1, according to the first category: fusible poles not classified "fixed obstacle", or according to the second category: fusible masts classified as "fixed obstacle”.
  • This controlled weakening zone 4 is provided at the fasteners, in particular, above the base 3 and the mechanical connection 5, in this example made by a weld bead, so that the zone median of the controlled weakening zone 4 is remote from the transverse junction plane P by a distance D less than 200 mm.
  • the controlled weakening zone 4 is provided towards the lower end (i.e. that which is provided with the fixing means) of the fusible pole 1 when it is in place on its support.
  • the controlled weakening zone 4 is preferably offset with respect to the mechanical connection 5 while being close to the end of the barrel 2.
  • this zone has a median surface, not shown in the figures, which is substantially perpendicular to the longitudinal axis A of the barrel 2.
  • This particular arrangement of the controlled weakening zone 4 makes it possible to dissociate the maintenance function in normal use condition of the fuse pole 1, the function of securing by deformation and breaking of the fuse pole 1 in the event of a violent side impact. Moreover, as will be apparent later in the description, it is thus possible to control the formation of the controlled weakening zone 4 and therefore the precision with which it allows deformation and breakage of the drum 2.
  • fusible poles forming an angle and whose base is fixed vertically for example to the wall of a building. It is also possible, in certain particular configurations, to use the suspended fuse rods. In this case, the controlled weakening zone is clearly heard towards the upper end of the fuse pole, when the barrel is in the suspended fixed position, (i.e. the one provided with the fixing means).
  • the controlled weakening zone 4 is provided on the periphery of the barrel 2, on a predetermined height H of between 10 and 50 mm, so as to form a thin portion of which the median plane is perpendicular to the plane containing the longitudinal axis. A barrel, and this without the creation of recess such as light or slot at this area.
  • FIG. 3 illustrates a fusible pole 1 after lateral impact, on which it is observed that a part of the periphery of the barrel 2, at the level of the controlled weakening zone 4 is deformed, another part is broken, thus allowing the Fusible mast 1 to bend around the controlled weakening zone 4, and to be lying on the ground so as not to constitute a fixed obstacle.
  • the controlled weakening zone 4 is continuous. It can also be formed by successive sections, regularly along the periphery of the fuse pole. The sections can be oriented, for example, perpendicular or parallel to the longitudinal axis of the fuse pole. More precisely, the periphery of the barrel 2 at this periphery remains continuous and there are sections of controlled weakening zone without removal of material or addition of additional parts.
  • the transverse junction plane corresponds to the plane of intersection between the ground and the barrel.
  • a controlled weakening zone is provided at a distance of up to 200 mm from this transverse junction plane.
  • the weakening zone may be provided above the ground or buried.
  • a longitudinal shaft 2 is produced, for example by spinning.
  • a base 3 is made separately which is assembled with a mechanical connection 5 to the shaft 2, for example by means of a peripheral weld bead at the end of the shaft 2.
  • a controlled weakening zone 4 peripheral to the barrel 2 having a predetermined height H and having a maximum resistance moment smaller than that of the portions of the barrel 2 tangent to the controlled weakening zone, is produced.
  • the local heat treatment technique or the local melting technique for example, without the removal of material, is used.
  • This technique is implemented before or after the assembly of the base 3 to the shaft 2.
  • a heat treatment device is used respectively, a melting device making it possible to raise the temperature of the shaft 2, locally, at the desired controlled weakening zone 4, beyond the transformation temperature of the material forming the 2.
  • the TIG process is used, for example. Since the operation of producing this controlled weakening zone 4 is distinct from that of the connection between the base 3 and the barrel 2, it can be performed in a controlled manner in order to obtain fine mechanical characteristics, especially for the moment. resistant.
  • the welding operation of the base 3 on the shaft 2 can thus be managed in a conventional manner, the weld bead 5 and the controlled weakening zone 4 having distinct functions for distinct zones.
  • the fusible mast 1 set up on its support and serving for example road signs, its general resistance time allows it to withstand especially the effect of wind on the signaling elements that it carries, for example panel, fire tricolor.
  • the zone of controlled weakening the maximum resistance moment of which is less than that of the portions of the fuse pole 1 tangent to the controlled weakening zone 4, is veiled, then gives way , thus avoiding causing a dangerous deceleration for the passengers of the vehicle.
  • the rupture of the fusible mast especially in case of violent impact, may be brutal, almost immediate, without visible prior deformation.
  • the fusible pole according to the invention may be approved by means of actual impact tests mentioned above.
  • the controlled weakening zone may be covered with a coating serving as corrosion protection and may improve the appearance of the fusible pole at the level of the controlled weakening zone.
  • this area does not include a recess such as slot or light, there is no risk of clogging if it covers this area of coating under penalty to render this zone of controlled weakening ineffective.
  • the fuse pole 1 according to the invention designates any fuse pole not classified "fixed obstacle” and any fuse pole classified "fixed obstacle”.
  • the fuse pole 1 according to the invention can serve as a mast for traffic lights, road signs, signaling mast for intersections between trams and roadways, billboard, billboards, telephone lines, power lines or for any other similar use.
  • the controlled weakening zone may be designed to have a maximum resistance moment below the limit value required by the 570 daN.m. .
  • the verification of the compliance of the fusible mast 1 with this criterion can be carried out by simple bending test (without effect of speed) or by a finite element computation taking into account the zone of controlled weakening.
  • fusible masts 1 classified "fixed obstacle” the support is intended, in case of impact of a vehicle to yield to the base of the fuse pole 1 without causing deceleration dangerous for passengers. These fusible poles 1 thus provide passive safety.
  • the fusible poles 1 according to the invention can be approved according to the performances obtained during two tests of standardized shocks according to the categories without energy absorption (NE) or energy absorption (LE or HE).
  • the fusible mast according to the invention does not require any additional mechanical part or system. It does not require no more removal of material at the weakening zone.
  • the fuse pole according to the invention can be integrated into any urban or rural environment, it can be used on public roads, in private properties, in car parks, traffic areas such as airports, or any other suitable place.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Signs Or Road Markings (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)

Abstract

The invention relates to a fusible mast (1) comprising a shaft (2) provided at one end with attachment means (3) for attaching said fusible mast (1) to a mounting with which same shares a transverse junction plane (P), characterized in that said mast comprises a controlled weakening area (4) separate from the attaching means and having a structure made of a different material, in order to have a maximum resistance moment less than that of the adjacent portions; wherein said controlled weakening area (4), which is produced without removing any material, is provided on the periphery of said shaft (2) and, in the event of a lateral shock of a predetermined intensity to said shaft (2), is capable of promoting the deformation and then rupture of said shaft (2), without any preferred orientation, at said weakening area (4), in order to enable at least the deformation of a portion of said shaft (2) relative to said attachment means (3).

Description

MAT AVEC AFFAIBLISSEMENT CONTROLE NOTAMMENT POUR ELEMENT DE SIGNALISATION ET PROCEDE D'OBTENTION MAT WITH WEAKENING CONTROL IN PARTICULAR FOR SIGNALING ELEMENT AND METHOD OF OBTAINING
Domaine technique Technical area
La présente invention concerne un mât avec affaiblissement contrôlé, dit mât fusible, notamment pour éléments de signalisation routière, panneaux publicitaires ou autre. La présente invention concerne également un procédé d'obtention d'un tel mât fusible.  The present invention relates to a mast with controlled weakening, said fusible mast, especially for road signs, billboards or other. The present invention also relates to a method for obtaining such a fuse pole.
Technique antérieure Prior art
La signalisation routière est fréquemment mise en place au moyen d'éléments de signalisation tels que des panneaux, des feux tricolores, portés par des mâts solidarisés à la chaussée ou sur tout type de supports. Ces mâts sont généralement métalliques. Ils se composent d'un poteau se présentant sous la forme d'un fût tubulaire couplé en une de ses extrémités à des moyens de fixation. Selon une première configuration d' implantation, les moyens de fixation comportent une embase se présentant sous la forme d'une plaque d'appui et apte à permettre la fixation de l'ensemble, par exemple sur une platine prévue au sol. La platine est par exemple formée par la face supérieure d'un massif de fondation prévu dans le sol. La liaison entre le poteau et l'embase peut être assurée par des tiges filetées ancrées dans le massif de fondation.  Road signs are frequently put in place by means of signaling elements such as signs, traffic lights, carried by masts secured to the roadway or on any type of support. These masts are usually metallic. They consist of a pole in the form of a tubular shaft coupled at one of its ends to fastening means. According to a first configuration of implantation, the fixing means comprise a base in the form of a support plate and adapted to allow the attachment of the assembly, for example on a plate provided on the ground. The plate is for example formed by the upper face of a foundation provided in the ground. The connection between the post and the base can be provided by threaded rods anchored in the foundation.
Selon une seconde configuration d' implantation, le mât comporte une portion destinée à être enterrée sur une hauteur d'enfoncement suffisante, par exemple d'au moins 60 cm. La portion destinée à être enterrée définit au moins en partie les moyens de fixation. Dans cette seconde configuration, l'extrémité du poteau peut être pourvue d'une plaque anti-enfoncement pour limiter la variation de la profondeur d'enfoncement du mât.  According to a second configuration of implantation, the mast comprises a portion intended to be buried on a sufficient driving height, for example at least 60 cm. The portion intended to be buried defines at least part of the fixing means. In this second configuration, the end of the post may be provided with an anti-recess plate to limit the variation of the depth of penetration of the mast.
L'embase et la plaque anti-enfoncement des configurations d' implantation précédemment décrites peuvent être obtenues par moulage, forgeage, emboutissage ou tout autre procédé adapté. L'embase et la plaque antienfoncement peuvent être solidarisées au mât par assemblage boulonné, soudage, sertissage, collage ou toute autre technique adaptée. The base plate and the anti-sink plate Implant configurations previously described may be obtained by molding, forging, stamping or any other suitable method. The base and the anti-recess plate can be secured to the mast by bolted jointing, welding, crimping, gluing or any other suitable technique.
Quelle que soit leur configuration (mât sur platine ou mât enterré) , ces mâts, qui font partie intégrante de l'aménagement urbain, constituent néanmoins des obstacles fixes, ponctuels, agressifs, qui accroissent les risques de collision et donc la dangerosité de la circulation. Selon la réglementation, on entend par « obstacle fixe » tout élément rigide d'une hauteur, par rapport au plan de roulement des véhicules routiers, supérieure à 20 cm présentant un moment résistant maximal supérieur à 570 daN.m. Du fait de la dangerosité des obstacles fixes, la construction et l'implantation de ces mâts sont réglementées. Le guide technique intitulé « Traitement des obstacles latéraux sur les routes principales et hors agglomération » édité en 2002 par la SETRA, précise notamment les règles à respecter pour les obstacles fixes, à savoir :  Whatever their configuration (mast on platinum or buried mast), these masts, which are an integral part of the urban development, nonetheless constitute fixed obstacles, punctual, aggressive, which increase the risk of collision and therefore the dangerousness of traffic . According to the regulation, the term "fixed obstacle" means any rigid element of a height, in relation to the running surface of road vehicles, greater than 20 cm with a maximum resistant moment greater than 570 daN.m. Due to the dangerous nature of fixed obstacles, the construction and installation of these masts are regulated. The technical guide entitled "Treatment of lateral obstacles on main and off-road roads" published in 2002 by SETRA, specifies in particular the rules to be respected for fixed obstacles, namely:
- la mise en place du mât au-delà de la zone de sécurité,  - the installation of the mast beyond the safety zone,
- la mise en place du mât derrière une barrière de sécurité,  - the installation of the mast behind a safety barrier,
- l'utilisation de mât fusible ou de mât déformable ou dits à absorption d'énergie.  - The use of fuse pole or deformable mast or so-called energy absorption.
Les mâts fusibles sont notamment destinés à éviter, en cas de collision entre un véhicule et le mât fusible, que les passagers soient soumis à une décélération trop rapide et donc dangereuse. La norme EN 12767 intitulée « Sécurité passive des structures supports d' équipements de la route - Exigences et méthodes d'essais » décrit une méthode permettant, sur la base d'essais de chocs réels normalisés, d'évaluer et de classifier les mâts, selon le cas, dans la catégorie des mâts sans absorption d'énergieFusible poles are intended in particular to avoid, in the event of a collision between a vehicle and the fusible mast, that the passengers are subjected to a deceleration too fast and therefore dangerous. The EN 12767 standard entitled "Passive Safety of Road Equipment Support Structures - Requirements and Test Methods" describes a a method that allows, on the basis of standard real impact tests, the evaluation and classification of masts, as appropriate, in the category of masts without energy absorption
(NE) ou dans la catégorie des mâts à absorption d'énergie(NE) or in the category of energy absorbing masts
(LE ou HE) . (LE or HE).
Certains mâts fusibles connus comportent notamment un fût couplé à une semelle par une liaison mécanique « fragile » destinée à se rompre notamment en cas de collision entre un véhicule et le mât fusible. Cette liaison mécanique de type « fragile » est par exemple obtenue par l'intermédiaire d'une structure de couplage comprenant des pièces de raccordement mécanique, un manchon de raccordement collé par exemple entre deux portions du poteau, un système de rondelles spéciales déformables, une embase avec une articulation sphérique pouvant pivoter. Dans chacune de ces solutions,' des liaisons mécaniques nécessitent des pièces supplémentaires pour coupler le fût et la semelle ou l'embase à ses fixations dans le sol. Cette solution est donc compliquée à mettre en œuvre et onéreuse .  Some known fusible poles include in particular a shaft coupled to a sole by a "fragile" mechanical connection intended to break in particular in case of collision between a vehicle and the fusible mast. This "fragile" type mechanical connection is for example obtained by means of a coupling structure comprising mechanical connection pieces, a connection sleeve bonded for example between two portions of the post, a system of special deformable washers, a base with a spherical joint pivotable. In each of these solutions, mechanical links require additional pieces to couple the barrel and the flange or base to its attachments in the ground. This solution is therefore complicated to implement and expensive.
Exposé de l'invention Presentation of the invention
La présente invention vise à remédier à ces inconvénients en proposant une alternative de mât fusible notamment pour élément de signalisation, ne comportant pas de pièce ni de système mécanique additionnel et donc simple à mettre en œuvre. La présente invention vise également à proposer un procédé de fabrication simple et reproductible permettant d'obtenir des mâts fusibles fiables.  The present invention aims to remedy these drawbacks by proposing an alternative fuse pole including signal element, having no part or additional mechanical system and therefore easy to implement. The present invention also aims to provide a simple and reproducible manufacturing process for obtaining reliable fusible masts.
L'invention concerne un mât fusible notamment pour élément de signalisation routière comportant un fût longitudinal pourvu en au moins une extrémité" de moyens de fixation destinés à fixer le mât fusible sur un support de sorte que le support et le mât fusible partagent un plan de jonction transversal. Ce mât fusible est remarquable en ce que le fût comporte au moins une zone d'affaiblissement contrôlée distincte des moyens de fixation, au niveau de laquelle la structure du matériau est différente de celle des portions du fût adjacentes à ladite zone d'affaiblissement contrôlée, de sorte que la zone d'affaiblissement contrôlée est réalisée sans enlèvement de matériau et présente un moment résistant maximal inférieur à celui des portions du fût adjacentes à la zone d'affaiblissement contrôlée, la zone -d'affaiblissement contrôlée étant prévue sur la périphérie du fût et étant apte, en cas de choc latéral d'une intensité prédéterminée sur le fût, à favoriser la déformation puis la rupture du fût au niveau de la zone d'affaiblissement contrôlée, sans orientation préférentielle, pour autoriser au moins la déformation d'une partie du fût par rapport aux moyens de fixation. The invention relates to a fuse mast particular for road signaling element comprising a longitudinal shaft provided in at least one end "of fixing means for fixing the fuse mast on a support so that the support and the fusible mast share a plan transverse junction. This fusible mast is remarkable in that the barrel comprises at least one controlled weakening zone distinct from the fastening means, at which the structure of the material is different from that of the portions of the barrel adjacent to said controlled weakening zone. so that the controlled weakening zone is formed without material removal and has a maximum peak moment resistance lower than that of the barrel portions adjacent to the controlled weakening zone, the controlled weakening zone being provided on the periphery of the and being able, in the event of a lateral impact of a predetermined intensity on the shaft, to favor the deformation and then the rupture of the shaft at the level of the zone of controlled weakening, without preferential orientation, to allow at least the deformation of a portion of the barrel relative to the fastening means.
Le mât fusible selon l'invention est donc simple à réaliser .  The fuse pole according to the invention is therefore simple to achieve.
En effet, pour réaliser ce mât selon l'invention, il suffit de pourvoir le fût d'une zone localisée sur la périphérie du. fût, du même matériau que le fût, mais ayant subit un traitement telles que les propriétés physiques et mécaniques de la zone locale soient différentes des propriétés physiques et mécaniques des portions du fût adjacentes qui l'enserrent (en particulier ayant un moment résistant maximal inférieur à celui des portions) . Pour réaliser le fût, on comprend donc qu'il n'est pas nécessaire d'avoir recours à des étapes de réalisation supplémentaires, en particulier l'étape d'enlèvement de matière pour affaiblir le fût au niveau de la zone d'affaiblissement contrôlée. En d'autres termes aucun évidement (lumière ou fente) n'est réalisé au niveau de la périphérie du fût pour affaiblir ladite zone. En autorisant la déformation et la rupture du fût au niveau de la zone d'affaiblissement contrôlée, il permet, lors d'une collision entre un véhicule et le mât fusible, de limiter la décélération subie par les passagers du véhicule, et/ou de ne pas aggraver un accident en constituant un obstacle fixe contre lequel le véhicule pourrait être écrasé par un autre, ce qui peut se produire en particulier au niveau des intersections avec tramway. Indeed, to achieve this mast according to the invention, it is sufficient to provide the barrel of a zone located on the periphery of the. barrel, of the same material as the barrel, but having undergone a treatment such that the physical and mechanical properties of the local zone are different from the physical and mechanical properties of the adjacent portions of the barrel that surround it (in particular having a lower maximum resistant moment to that of the portions). To realize the barrel, it is therefore understood that it is not necessary to resort to additional realization steps, in particular the step of removing material to weaken the barrel at the level of the controlled weakening zone . In other words no recess (light or slot) is made at the periphery of the barrel to weaken said area. By allowing deformation and breaking of the barrel at the level of the controlled weakening zone, it allows, during a collision between a vehicle and the fusible mast, to limit the deceleration experienced by the passengers of the vehicle, and / or do not aggravate an accident by constituting a fixed obstacle against which the vehicle could be crushed by another, which can occur especially at street intersections.
La hauteur de la zone d'affaiblissement contrôlée prédéterminée est de préférence comprise entre 10 à 50 mm.  The height of the predetermined controlled weakening zone is preferably between 10 and 50 mm.
C'est une hauteur suffisante qui permet au fût de se déformer et de rompre localement au niveau de la zone d'affaiblissement contrôlée sans affaiblir la structure générale du fût qui continue à remplir sa fonction habituelle à laquelle il est destiné.  This is a sufficient height that allows the shaft to deform and break locally at the controlled weakening zone without weakening the overall structure of the drum which continues to perform its usual function for which it is intended.
De manière avantageuse, la zone médiane de la zone d' affaiblissement contrôlée est située à une distance du plan de jonction transversal inférieure ou égale à 200 mm.  Advantageously, the median zone of the controlled weakening zone is located at a distance from the transverse junction plane less than or equal to 200 mm.
Les moyens de fixation comportent une embase transversale formant au moins en partie les moyens de fixation et couplée au fût par une liaison mécanique, la face inférieure de l'embase définissant le plan de jonction transversal lorsque le mât fusible est dans son utilisation normale. La liaison mécanique est par exemple un assemblage boulonné, un cordon de soudure, un sertissage, un collage ou toute autre liaison mécanique adaptée.  The fastening means comprise a transverse base forming at least partly the fastening means and coupled to the barrel by a mechanical connection, the lower face of the base defining the transverse junction plane when the fuse pole is in its normal use. The mechanical connection is for example a bolted connection, a weld bead, a crimping, a bonding or any other suitable mechanical connection.
Le fût comporte avantageusement une portion destinée à être enterrée dans le sol, cette portion définissant au moins en partie les moyens de fixation, l'intersection entre le sol et le fût étant destinée à définir le plan de jonction transversal lorsque le mât fusible est dans son utilisation normale.  The barrel advantageously comprises a portion intended to be buried in the ground, this portion defining at least partly the fastening means, the intersection between the ground and the barrel being intended to define the transverse junction plane when the fusible mast is in its normal use.
Selon un mode de réalisation préféré, la zone d'affaiblissement contrôlée est continue. On comprend ainsi, que le moment résistant maximal (qui est inférieur à celui des zones adjacentes à la zone) est le même en tout point de ladite zone d'affaiblissement contrôlée . According to a preferred embodiment, the zone of controlled weakening is continuous. It is thus understood that the maximum resistance moment (which is less than that of the zones adjacent to the zone) is the same at any point of said controlled weakening zone.
Le fût est par exemple réalisé dans l'un des matériaux choisi dans le groupe comprenant les alliages d'aluminium, les aciers écrouis, les aciers à haute limite d'élasticité.  The drum is for example made in one of the materials selected from the group consisting of aluminum alloys, hardened steels, high yield strength steels.
L'invention concerne également un procédé d'obtention d'un mât fusible, notamment pour élément de signalisation routière, au cours duquel on réalise un fût longitudinal couplé à des moyens de fixation destinés à fixer le mât fusible sur un support de sorte que le support et le mât fusible partagent un plan de jonction transversal. Ce procédé est remarquable en ce que l'on réalise, sur le fût, au moins une zone d'affaiblissement contrôlée distincte des moyens de fixation au niveau de laquelle on modifie la structure du matériau de sorte que la zone d'affaiblissement contrôlée soit réalisée sans enlèvement de matière et présente un moment résistant maximal inférieur à celui des portions du fût adjacentes à la zone d'affaiblissement contrôlée, la zone d'affaiblissement contrôlée étant prévue sur la périphérie du fût et étant apte, en cas de choc latéral d'une intensité prédéterminée sur le fût, à favoriser la déformation puis la rupture du fût au niveau de la zone d'affaiblissement contrôlée, sans orientation préférentielle, pour autoriser au moins la déformation d'une partie du fût par rapport aux moyens de fixation .  The invention also relates to a method for obtaining a fusible pole, in particular for a road signaling element, during which a longitudinal shaft coupled to fastening means for fixing the fusible pole on a support is produced so that the support and the fusible mast share a transverse junction plane. This process is remarkable in that at least one controlled weakening zone is produced on the barrel that is distinct from the fastening means at which the structure of the material is modified so that the zone of controlled weakening is achieved. without material removal and has a maximum resistance moment lower than that of the portions of the barrel adjacent to the controlled weakening zone, the controlled weakening zone being provided on the periphery of the barrel and being adapted, in case of side impact of a predetermined intensity on the barrel, to promote the deformation and rupture of the barrel at the controlled weakening zone, without preferential orientation, to allow at least the deformation of a portion of the barrel relative to the fastening means.
Selon un premier mode de mise en œuvre, on réalise la zone d'affaiblissement contrôlée par traitement thermique local, sans apport de matière, au moyen d'un dispositif de traitement thermique permettant d'élever localement la température du fût, au niveau de la zone d'affaiblissement contrôlée, au-delà de la température de transformation du matériau formant le fût. According to a first mode of implementation, the zone of weakening controlled by local heat treatment is carried out, without addition of material, by means of a heat treatment device making it possible to raise locally the temperature of the drum, at the level of the weakening zone controlled, beyond the transformation temperature of the material forming the drum.
Selon un second mode de mise en œuvre, on réalise la zone d'affaiblissement contrôlée par fusion locale, sans apport et sans enlèvement de matière, au moyen d'un dispositif de fusion permettant d'élever localement la température du fût, au niveau de la zone d'affaiblissement contrôlée, au-delà de la température de transformation du matériau formant ledit fût.  According to a second embodiment, the region of weakening controlled by local melting, without input and without removal of material, is carried out by means of a melting device making it possible to locally raise the temperature of the drum, at the level of the zone of controlled weakening, beyond the transformation temperature of the material forming said barrel.
Selon ces deux modes de réalisation de l' invention, le fût, localement au niveau de la zone d'affaiblissement, ne subit pas de traitement ou de procédé d'usinage, quel qu'il soit. On n'enlève pas de matière et on ne rajoute pas de pièce ni de système mécanique additionnel.  According to these two embodiments of the invention, the shaft, locally at the level of the weakening zone, does not undergo any treatment or machining process, whatever it may be. We do not remove material and we do not add part or additional mechanical system.
Les procédés utilisés consistent à déformer donc plastiquement le matériau localement au niveau de la zone d'affaiblissement pour obtenir le moment de résistance désiré .  The methods used consist in plastically deforming the material locally at the weakening zone to obtain the desired moment of resistance.
Il suffit ainsi de faire subir au fût au niveau de ladite zone un traitement thermique ou une fusion pour obtenir cet affaiblissement de la zone.  It suffices to subject the barrel at the level of said zone to heat treatment or melting to obtain this weakening of the zone.
Description sommaire des dessins Brief description of the drawings
D' autres avantages et caractéristiques ressortiront mieux de la description qui va suivre d'un mât fusible et de son procédé d'obtention selon l'invention en référence aux figures annexées sur lesquelles :  Other advantages and features will become more apparent from the following description of a fusible pole and its method of production according to the invention with reference to the appended figures in which:
- la figure 1 est une vue en élévation éclatée d'une portion du mât fusible selon l'invention ;  - Figure 1 is an exploded elevational view of a portion of the fuse pole according to the invention;
- la figure 2 est une vue de dessus du mât fusible de la figure 1 ;  - Figure 2 is a top view of the fuse pole of Figure 1;
- la figure 3 est une vue similaire à la figure 1 du mât fusible, selon l'invention après un choc latéral, la zone de faiblesse ayant en partie rompue et étant en partie déformée pour autoriser l'inclinaison d'une partie du mât fusible en partie arraché par rapport à son embase. - Figure 3 is a view similar to Figure 1 of the fuse mast according to the invention after a side impact, the zone of weakness has broken in part and being in part deformed to allow the inclination of a portion of the fuse pole partially ripped relative to its base.
Meilleure manière de réaliser l'invention Best way to realize the invention
Dans la présente demande, on utilise le terme « mât fusible » pour désigner deux types de catégories de mâts avec affaiblissement contrôlé, dit mâts fusibles, qui répondent à des réglementations différentes.  In the present application, the term "fusible mast" is used to designate two types of categories of masts with controlled weakening, called fusible poles, which meet different regulations.
Une première catégorie concerne les mâts fusibles non classés « obstacle fixe » qui ne constituent pas, réglementairement, des obstacles fixes par rapport aux véhicules routiers et sont considérés comme non-dangereux. Ces mâts fusibles non classés « obstacle fixe » sont par exemple utilisés en tant que :  A first category concerns fuse poles not classified as a "fixed obstacle" which do not constitute, legally speaking, fixed obstacles in relation to road vehicles and are considered as non-hazardous. These unclassified fuse poles "fixed obstacle" are for example used as:
- mât pour feux de signalisation,  - mast for traffic lights,
- support de dimensions standard pour panneau de signalisation verticale,  - standard size support for vertical traffic sign,
- mât de signalisation pour intersections entre tramways et voies routières,  - signaling mast for intersections between trams and roadways,
- toute autre application compatible.  - any other compatible application.
La capacité de résistance au vent de ce mât fusible non classés « obstacle fixe » permet des applications complémentaires à celles des poteaux homologués à ce jour, en particulier pour des panneaux de plus grandes dimensions .  The wind resistance capacity of this non-classified "fixed obstacle" fuse pole allows complementary applications to the poles approved to date, particularly for larger panels.
Une seconde catégorie concerne les mâts fusibles classés « obstacle fixe » ou dits, mâts à sécurité passive. Les mâts fusibles de cette seconde catégorie ont des dimensions supérieures à ceux de la première catégorie et offrent une plus grande résistance en flexion (supérieure à 570 daN.m). Ces mâts fusibles classés « obstacle fixe » sont par exemple utilisés en tant que :  A second category concerns fusible masts classified as "fixed obstacle" or so-called passive masts. The fusible poles of this second category have dimensions greater than those of the first category and offer greater flexural strength (greater than 570 daNm). These fusible masts classified "fixed obstacle" are for example used as:
- supports de grandes dimensions P°ur panneau de signalisation verticale, - mâts d'éclairage, - large supports P ° ur vertical sign, - lighting masts,
- support de panneaux publicitaires ou similaires, - support of billboards or the like,
- poteaux de lignes électrique et/ou téléphonique.- poles of electric and / or telephone lines.
En référence aux figures 1 à 3, le mât fusible 1 selon l'invention comporte un fût 2 longitudinal, couplé à des moyens de fixation 3. Dans l'exemple de la présente demande, on entend par fût un élément creux allongé, mais il peut être plein également. Dans l'exemple illustré, le fût 2 a une section circulaire d'axe longitudinal A et est cylindrique. Le fût 2 a par exemple un diamètre de 120 mm et une épaisseur de 3 à 4 mm. With reference to FIGS. 1 to 3, the fuse pole 1 according to the invention comprises a longitudinal shaft 2, coupled to fixing means 3. In the example of the present application, the term "shaft" is understood to mean an elongate hollow element, but can be full also. In the example shown, the barrel 2 has a circular section of longitudinal axis A and is cylindrical. The barrel 2 has for example a diameter of 120 mm and a thickness of 3 to 4 mm.
Dans d'autres variantes de réalisation non représentées, le fût peut avoir une section polygonale. Il peut également être conique, voire présenter plusieurs variations de diamètre sur sa longueur.  In other embodiments not shown, the barrel may have a polygonal section. It can also be conical, or even have several variations in diameter along its length.
Le fût 2 est par exemple réalisé en alliage d'aluminium, acier écroui, acier obtenu par laminage thermomécanique ou tout autre matériau adapté. On choisit de préférence des matériaux sensibles à l'affaiblissement contrôlé des propriétés mécaniques et physiques résultant d'un traitement thermique ou d'une fusion. On utilise par exemple des alliages d' aluminium aptes au durcissement par précipitation (alliages dits trempants) et/ou durcis par écrouissage qui ont cette particularité, en particulier les alliages d'aluminium de la série 6000. Les états trempé- revenu, trempé écroui sont spécialement adaptés. On peut également utiliser des aciers écrouis à haute limite d'élasticité, sensibles, tel que notamment un acier à haute limite d'élasticité tel que par exemple la nuance S500MC. Les phénomènes métallurgiques de recristallisation, qui interviennent grâce au traitement thermique ou à la fusion, conduisent à une diminution significative de la résistance et de la dureté de l'acier avec, simultanément, une amélioration de la ductilité (allongement et striction) . Dans l'exemple illustré, le fût 2 comporte une embase 3 formant les moyens de fixation. Cette embase 3 se présente sous la forme d'une plaque sensiblement plane et carrée, disposée sensiblement perpendiculairement à l'axe longitudinal A du fût 2. L'embase 3 est traversée, en ses angles, par des orifices 6 permettant le passage de brides (non représentées) de fixation à un support (non représenté) . Les brides sont par exemple formées par des tiges filetées et le support comporte par exemple une platine de fixation formée par la face supérieure d'un massif de fondation prévu dans la chaussée. L'embase 3 est raccordée au fût 2 par une liaison mécanique 5 réalisée par assemblage boulonné, soudage, sertissage, collage ou par toute liaison mécanique adaptée. L'embase 3 est par exemple réalisée en alliage d'aluminium, acier écroui ou tout autre matériau adapté compatible à l'assemblage par soudure avec le fût 2. L'embase 3 peut également être réalisée dans un matériau différent de celui utilisé pour le fût 2. Le mât fusible 1 ainsi formé est destiné à être utilisé selon la première configuration d'implantation précédemment décrite, à savoir au-dessus du sol, fixé à un support ancré dans le sol. Dans ce mode de réalisation, les moyens de fixation du fût comportent l'embase 3, les brides (non représentées) et le cordon de soudure 5. Le support et le mât fusible 1 partagent le plan de jonction transversal P. The barrel 2 is for example made of aluminum alloy, hardened steel, steel obtained by thermomechanical rolling or any other suitable material. Materials sensitive to controlled weakening of the mechanical and physical properties resulting from heat treatment or melting are preferably selected. For example, alloys of aluminum capable of hardening by precipitation (so-called hardening alloys) and / or hardened by work hardening which have this particularity, in particular aluminum alloys of the 6000 series, are used. Hardened-tempered, quenched hardened states are specially adapted. It is also possible to use hardened high tensile strength steels, such as in particular a high yield strength steel such as, for example, the S500 ™ grade. Metallurgical recrystallization phenomena, which occur through heat treatment or melting, lead to a significant decrease in the strength and hardness of the steel with simultaneous improvement in ductility (elongation and necking). In the example shown, the barrel 2 comprises a base 3 forming the fastening means. This base 3 is in the form of a substantially flat and square plate disposed substantially perpendicularly to the longitudinal axis A of the barrel 2. The base 3 is traversed at its corners by orifices 6 allowing the passage of flanges. (not shown) attachment to a support (not shown). The flanges are for example formed by threaded rods and the support comprises for example a mounting plate formed by the upper face of a foundation provided in the pavement. The base 3 is connected to the shaft 2 by a mechanical connection 5 made by bolted jointing, welding, crimping, bonding or any suitable mechanical connection. The base 3 is for example made of aluminum alloy, hardened steel or any other suitable material compatible with the assembly by welding with the barrel 2. The base 3 can also be made of a material different from that used for the 2. The fusible pole 1 thus formed is intended to be used according to the first configuration configuration previously described, namely above the ground, fixed to a support anchored in the ground. In this embodiment, the means for fixing the barrel comprise the base 3, the flanges (not shown) and the weld bead 5. The support and the fuse pole 1 share the transverse junction plane P.
Selon une variante de réalisation non représentée, le fût et l'embase sont couplés par tout autre moyen adapté. Le fût et l'embase peuvent également être formés d'une pièce unique.  According to an alternative embodiment not shown, the shaft and the base are coupled by any other suitable means. The barrel and the base can also be formed of a single piece.
Selon un second mode de réalisation non représenté, le fût est destiné à être utilisé selon la seconde configuration d' implantation précédemment décrite, à savoir en partie enterré sol. Selon cette configuration, une extrémité du fût est destinée à être enterrée dans le sol. Cette extrémité peut être pourvue ou non d'une plaque antienfoncement. Dans cette variante de réalisation, les moyens de fixation du mât fusible comportent notamment la portion de fût destinée à être enterrée et la plaque anti¬ enfoncement lorsque celle-ci est présente. According to a second embodiment not shown, the shaft is intended to be used according to the second configuration configuration previously described, namely partially buried ground. According to this configuration, one end of the barrel is intended to be buried in the ground. This end may or may not be provided with an anti-recess plate. In this variant embodiment, the fastening means of the fusible mast comprise in particular the portion of the drum intended to be buried and the anti- ¬ depression plate when it is present.
Selon un autre mode de réalisation non représenté, le fût peut être pourvu de moyens de fixation se présentant sous une forme différente de celles précédemment décrites.  According to another embodiment not shown, the barrel may be provided with fastening means in a form different from those previously described.
Le fût 2 comporte une zone d'affaiblissement contrôlée 4 localisée et obtenue sans enlèvement de matériau. Elle présente un moment résistant maximal inférieur au reste du fût 2 afin qu'en cas de sollicitation latérale d'une intensité prédéterminée sur le fût 2, la zone d'affaiblissement contrôlée 4 favorise l'inclinaison du fût 2 avec une déformation de le l'une de ses extrémités la plus proche des moyens de fixation, plus précisément dans l'exemple des figures, son extrémité inférieure. La zone d'affaiblissement contrôlée 4 rompt, en cas de choc sur le fût, en partie ou en totalité, et le fût 2 est couché au sol, arraché ou non de son support pour ne pas constituer un obstacle fixe.  The barrel 2 has a localized controlled weakening zone 4 obtained without removal of material. It has a maximum maximum resistance moment to the rest of the barrel 2 so that in case of lateral bias of a predetermined intensity on the barrel 2, the controlled weakening zone 4 promotes the inclination of the barrel 2 with a deformation of the barrel 2. one of its ends closest to the fastening means, more precisely in the example of the figures, its lower end. The zone of controlled weakening 4 breaks, in the event of impact on the shaft, in part or in whole, and the shaft 2 is lying on the ground, torn off or not from its support so as not to constitute a fixed obstacle.
L' ensemble du fût 2 a un moment résistant lui permettant de résister aux conditions normales d'utilisation, notamment au vent, en particulier pour les mâts fusibles destinés à supporter des panneaux, feux tricolores. Dans ce cas précis, la zone d'affaiblissement contrôlée 4 a un moment résistant maximal inférieur à celui du fût, notamment, à 570daN. La zone d'affaiblissement contrôlée 4 permet, en cas de choc latéral sur le fût 2, nécessairement décalée par rapport à la zone d'affaiblissement contrôlée 4, à une distance et une intensité telle que le couple généré sur la zone d'affaiblissement contrôlée 4 est supérieur à 570daN, que le fût 2 se déforme, voire se rompe au niveau de la zone d'affaiblissement contrôlée 4. Ce choc est par exemple causé par la collision d'un véhicule avec le mât fusible 1. The entire barrel 2 has a resistant moment allowing it to withstand normal conditions of use, especially the wind, especially for fusible poles intended to support panels, traffic lights. In this particular case, the zone of controlled weakening 4 has a maximum resistant moment less than that of the drum, in particular, at 570daN. The controlled weakening zone 4 makes it possible, in the event of a lateral impact on the barrel 2, necessarily offset with respect to the controlled weakening zone 4, at a distance and an intensity such that the torque generated on the controlled weakening zone 4 is greater than 570daN, that the barrel 2 deforms or even breaks at the level of the zone 4. This shock is for example caused by the collision of a vehicle with the fuse pole 1.
Le moment résistant maximal de la zone d'affaiblissement contrôlée 4 est bien entendu adapté selon les besoins et en particulier en fonction de la destination du mât fusible 1, selon la première catégorie : mâts fusibles non classés « obstacle fixe », ou selon la seconde catégorie : mâts fusibles classés « obstacle fixe ».  The maximum resistance moment of the controlled weakening zone 4 is of course adapted according to the needs and in particular according to the destination of the fuse pole 1, according to the first category: fusible poles not classified "fixed obstacle", or according to the second category: fusible masts classified as "fixed obstacle".
Cette zone d'affaiblissement contrôlée 4 est prévue au niveau des fixations, en particulier, au-dessus de l'embase 3 et de la liaison mécanique 5, dans cet exemple réalisé par u cordon de soudure, -ë- de sorte que la zone médiane de la zone d'affaiblissement contrôlée 4 soit éloignée du plan de jonction transversal P d'une distance D inférieure à 200 mm.  This controlled weakening zone 4 is provided at the fasteners, in particular, above the base 3 and the mechanical connection 5, in this example made by a weld bead, so that the zone median of the controlled weakening zone 4 is remote from the transverse junction plane P by a distance D less than 200 mm.
Ainsi, la zone d'affaiblissement contrôlée 4 est prévue vers l'extrémité inférieure (i.e. celle qui est pourvue des moyens de fixation) du mât fusible 1 lorsqu'il est en place sur son support. La zone d'affaiblissement contrôlée 4 est de préférence décalée par rapport à la liaison mécanique 5 tout en étant proche de l'extrémité du fût 2.  Thus, the controlled weakening zone 4 is provided towards the lower end (i.e. that which is provided with the fixing means) of the fusible pole 1 when it is in place on its support. The controlled weakening zone 4 is preferably offset with respect to the mechanical connection 5 while being close to the end of the barrel 2.
Par ailleurs, cette zone présente une surface médiane, non représentée sur les figures, qui est sensiblement perpendiculaire à l'axe longitudinal A du fût 2.  Furthermore, this zone has a median surface, not shown in the figures, which is substantially perpendicular to the longitudinal axis A of the barrel 2.
Cette disposition particulière de la zone d'affaiblissement contrôlée 4 permet de dissocier la fonction de maintien en condition normale d'utilisation du mât fusible 1, de la fonction de sécurisation par déformation et rupture du mât fusible 1 en cas de choc latéral violent. De plus, comme il ressortira plus loin de la description, on peut ainsi contrôler la formation de la zone d'affaiblissement contrôlée 4 et donc la précision avec laquelle elle autorise la déformation et la rupture du fût 2. This particular arrangement of the controlled weakening zone 4 makes it possible to dissociate the maintenance function in normal use condition of the fuse pole 1, the function of securing by deformation and breaking of the fuse pole 1 in the event of a violent side impact. Moreover, as will be apparent later in the description, it is thus possible to control the formation of the controlled weakening zone 4 and therefore the precision with which it allows deformation and breakage of the drum 2.
On peut bien entendu utiliser des mâts fusibles formant un angle et dont l'embase est fixée verticalement par exemple à la paroi d'un bâtiment. On peut également, dans certaines configurations particulières, utiliser les mâts fusibles suspendus. Dans ce cas, la zone d'affaiblissement contrôlée se trouve bien entendue vers l'extrémité supérieure du mât fusible, lorsque le fût se trouve en position fixée suspendue, (i.e. celle pourvue des moyens de fixation) .  It is of course use fusible poles forming an angle and whose base is fixed vertically for example to the wall of a building. It is also possible, in certain particular configurations, to use the suspended fuse rods. In this case, the controlled weakening zone is clearly heard towards the upper end of the fuse pole, when the barrel is in the suspended fixed position, (i.e. the one provided with the fixing means).
La zone d' affaiblissement contrôlée 4 est prévue sur la périphérie du fût 2, sur une hauteur H prédéterminée comprise entre 10 et 50 mm, de manière à former une portion de faible épaisseur dont le plan médian est perpendiculaire au plan contenant l'axe longitudinal A du fût, et ce, sans la création d' évidement tel que lumière ou fente au niveau de cette zone.  The controlled weakening zone 4 is provided on the periphery of the barrel 2, on a predetermined height H of between 10 and 50 mm, so as to form a thin portion of which the median plane is perpendicular to the plane containing the longitudinal axis. A barrel, and this without the creation of recess such as light or slot at this area.
Le fait que la zone d'affaiblissement contrôlée 4 soit périphérique, permet qu'elle n'ait pas d'orientation préférentielle et qu'elle autorise la déformation puis la rupture du fût 2 en fonction de la direction et de l'intensité du choc latéral qu'il subit. La figure 3 illustre un mât fusible 1 après choc latéral, figure sur laquelle on observe qu'une partie de la périphérie du fût 2, au niveau de la zone d'affaiblissement contrôlée 4 est déformée, une autre partie est rompue, permettant ainsi au mât fusible 1 de se plier autour de la zone d'affaiblissement contrôlée 4, et d'être couché au sol pour ne pas constituer un obstacle fixe.  The fact that the zone of controlled weakening 4 is peripheral, allows it to have no preferential orientation and that it allows the deformation and then the breakage of the shaft 2 depending on the direction and the intensity of the impact lateral that he undergoes. FIG. 3 illustrates a fusible pole 1 after lateral impact, on which it is observed that a part of the periphery of the barrel 2, at the level of the controlled weakening zone 4 is deformed, another part is broken, thus allowing the Fusible mast 1 to bend around the controlled weakening zone 4, and to be lying on the ground so as not to constitute a fixed obstacle.
Dans l'exemple illustré, la zone d'affaiblissement contrôlée 4 est continue. Elle peut également être formée par des tronçons successifs, régulièrement le long de la périphérie du mât fusible. Les tronçons peuvent être orientés, par exemple, perpendiculairement ou parallèlement à l'axe longitudinal du mât fusible. Plus précisément, la périphérie du fût 2 au niveau de cette périphérie reste continue et on y pratique des tronçons de zone d' affaiblissement contrôlée sans enlèvement de matière ou rajout de pièces supplémentaires. In the illustrated example, the controlled weakening zone 4 is continuous. It can also be formed by successive sections, regularly along the periphery of the fuse pole. The sections can be oriented, for example, perpendicular or parallel to the longitudinal axis of the fuse pole. More precisely, the periphery of the barrel 2 at this periphery remains continuous and there are sections of controlled weakening zone without removal of material or addition of additional parts.
Selon le second mode de réalisation non représenté avec fût en partie enterré dans le sol, le plan de jonction transversal correspond au plan d' intersection entre le sol et le fût. Pour ce mode d'utilisation, on prévoit une zone d'affaiblissement contrôlée à une distance pouvant aller jusqu'à 200 mm de ce plan de jonction transversal. La zone d'affaiblissement peut être prévue au-dessus du sol ou enterrée .  According to the second embodiment, not shown, with the barrel partly buried in the ground, the transverse junction plane corresponds to the plane of intersection between the ground and the barrel. For this mode of use, a controlled weakening zone is provided at a distance of up to 200 mm from this transverse junction plane. The weakening zone may be provided above the ground or buried.
Pour obtenir un mât fusible 1 selon l'invention, on réalise un fût 2 longitudinal, par exemple par filage. On réalise séparément une embase 3 que l'on assemble avec une liaison mécanique 5 au fût 2, par exemple au moyen d'un cordon de soudure périphérique à l'extrémité du fût 2.  To obtain a fusible pole 1 according to the invention, a longitudinal shaft 2 is produced, for example by spinning. A base 3 is made separately which is assembled with a mechanical connection 5 to the shaft 2, for example by means of a peripheral weld bead at the end of the shaft 2.
On réalise sur le fût 2, une zone d'affaiblissement contrôlée 4 périphérique au fût 2, ayant une hauteur H prédéterminée et présentant un moment résistant maximal inférieur à celui des portions du fût 2 tangentes à la zone d' affaiblissement contrôlée .  On the barrel 2, a controlled weakening zone 4 peripheral to the barrel 2, having a predetermined height H and having a maximum resistance moment smaller than that of the portions of the barrel 2 tangent to the controlled weakening zone, is produced.
Pour générer la zone d'affaiblissement contrôlée 4, on utilise par exemple la technique du traitement thermique local ou la technique de la fusion locale, sans enlèvement de matériau. Cette technique est mise en œuvre avant ou après l'assemblage de l'embase 3 au fût 2. Pour chacune de ces techniques, on utilise respectivement un dispositif de traitement thermique, un dispositif de fusion permettant d'élever la température du fût 2, localement, au niveau de la zone d'affaiblissement contrôlée 4 souhaitée, au-delà de la température de transformation du matériau formant le fût 2. On utilise par exemple le procédé TIG. L'opération de réalisation de cette zone d' affaiblissement contrôlée 4 étant distincte de celle d'assemblage entre l'embase 3 et le fût 2, elle peut être réalisée de manière contrôlée afin d'obtenir des caractéristiques mécaniques fines, notamment pour le moment résistant. L'opération de soudure de l'embase 3 sur le fût 2 peut ainsi être gérée de manière traditionnelle, le cordon de soudure 5 et la zone d'affaiblissement contrôlée 4 ayant des fonctions distinctes pour des zones distinctes. In order to generate the controlled weakening zone 4, the local heat treatment technique or the local melting technique, for example, without the removal of material, is used. This technique is implemented before or after the assembly of the base 3 to the shaft 2. For each of these techniques, a heat treatment device is used respectively, a melting device making it possible to raise the temperature of the shaft 2, locally, at the desired controlled weakening zone 4, beyond the transformation temperature of the material forming the 2. The TIG process is used, for example. Since the operation of producing this controlled weakening zone 4 is distinct from that of the connection between the base 3 and the barrel 2, it can be performed in a controlled manner in order to obtain fine mechanical characteristics, especially for the moment. resistant. The welding operation of the base 3 on the shaft 2 can thus be managed in a conventional manner, the weld bead 5 and the controlled weakening zone 4 having distinct functions for distinct zones.
Une fois le mât fusible 1 mis en place sur son support et servant par exemple de signalisation routière, son moment résistant général lui permet de résister notamment à l'effet du vent sur les éléments de signalisation qu' il porte, par exemple panneau, feu tricolore. En cas de collision d'un véhicule avec le mât fusible 1, la zone d'affaiblissement contrôlée dont le moment résistant maximal est inférieur à celui des portions du mât fusible 1 tangentes à la zone d'affaiblissement contrôlée 4, se voile, puis cède, évitant ainsi de provoquer une décélération dangereuse pour les passagers du véhicule. La rupture du mât fusible, notamment en cas de choc violent, peut-être brutale, presque immédiate, sans déformation préalable visible. Le mât fusible selon l'invention peut être homologué au moyen d'essais de chocs réels mentionnés précédemment.  Once the fusible mast 1 set up on its support and serving for example road signs, its general resistance time allows it to withstand especially the effect of wind on the signaling elements that it carries, for example panel, fire tricolor. In the event of a collision of a vehicle with the fuse pole 1, the zone of controlled weakening, the maximum resistance moment of which is less than that of the portions of the fuse pole 1 tangent to the controlled weakening zone 4, is veiled, then gives way , thus avoiding causing a dangerous deceleration for the passengers of the vehicle. The rupture of the fusible mast, especially in case of violent impact, may be brutal, almost immediate, without visible prior deformation. The fusible pole according to the invention may be approved by means of actual impact tests mentioned above.
Selon un mode de réalisation non représenté, la zone d'affaiblissement contrôlée peut être recouverte d'un revêtement faisant office de protection anticorrosion et pouvant permettre d'améliorer l'aspect extérieur du mât fusible au niveau de la zone d'affaiblissement contrôlée.  According to an embodiment not shown, the controlled weakening zone may be covered with a coating serving as corrosion protection and may improve the appearance of the fusible pole at the level of the controlled weakening zone.
Ainsi, comme cette zone ne comprend pas d' évidement tel que fente ou lumière, on ne court pas le risque des obstruer si on couvre cette zone de revêtement sous peine de rendre inefficace cette zone d'affaiblissement contrôlée . Thus, as this area does not include a recess such as slot or light, there is no risk of clogging if it covers this area of coating under penalty to render this zone of controlled weakening ineffective.
Possibilités d'application industrielle  Possibilities of industrial application
Comme indiqué précédemment, le mât fusible 1 selon l'invention désigne tout mât fusible non classé « obstacle fixe » et tout mât fusible classé « obstacle fixe ». Le mât fusible 1 selon l'invention peut servir de mât pour feux de signalisation, support de signalisation routière, mât de signalisation pour intersections entre tramways et voies routières, panneau d'indication, de panneaux publicitaire, de lignes téléphoniques, de lignes électriques ou pour toute autre utilisation similaire.  As indicated above, the fuse pole 1 according to the invention designates any fuse pole not classified "fixed obstacle" and any fuse pole classified "fixed obstacle". The fuse pole 1 according to the invention can serve as a mast for traffic lights, road signs, signaling mast for intersections between trams and roadways, billboard, billboards, telephone lines, power lines or for any other similar use.
Dans le cas de la première catégorie regroupant les mâts fusibles 1 non classés « obstacle fixe », la zone d' affaiblissement contrôlée peut être prévue de manière à présenter un moment résistant maximal inférieur à la valeur limite exigée par la réglementation de 570 daN.m. La vérification de la conformité du mât fusible 1 à ce critère peut être réalisée par essai de flexion simple (sans effet de vitesse) ou par un calcul élaboré par éléments finis prenant en compte la zone d'affaiblissement contrôlée.  In the case of the first category of fuses 1 not classified as a "fixed obstacle", the controlled weakening zone may be designed to have a maximum resistance moment below the limit value required by the 570 daN.m. . The verification of the compliance of the fusible mast 1 with this criterion can be carried out by simple bending test (without effect of speed) or by a finite element computation taking into account the zone of controlled weakening.
Dans le cas de la seconde catégorie regroupant les mâts fusibles 1 classés « obstacle fixe », le support est destiné, en cas de choc d'un véhicule à céder à la base du mât fusible 1 sans provoquer de décélération dangereuse pour les passagers. Ces mâts fusibles 1 apportent ainsi une sécurité passive.  In the case of the second category grouping fusible masts 1 classified "fixed obstacle", the support is intended, in case of impact of a vehicle to yield to the base of the fuse pole 1 without causing deceleration dangerous for passengers. These fusible poles 1 thus provide passive safety.
Les mâts fusibles 1 selon l'invention peuvent être homologués en fonction des performances obtenues au cours de deux essais de chocs normalisés suivant les catégories sans absorption d' énergie (NE) ou à absorption d'énergie (LE ou HE) .  The fusible poles 1 according to the invention can be approved according to the performances obtained during two tests of standardized shocks according to the categories without energy absorption (NE) or energy absorption (LE or HE).
Le mât fusible selon l'invention ne nécessite pas de pièce ou système mécanique additionnel. Il ne nécessite pas non plus d'enlèvement de matière au niveau de la zone d' affaiblissement . The fusible mast according to the invention does not require any additional mechanical part or system. It does not require no more removal of material at the weakening zone.
A ce titre, il est donc simple à réaliser. Le mât fusible selon l'invention peut être intégré à tout milieu urbain ou rural, il peut être utilisé sur la voie publique, dans des propriétés privées, dans des parkings, zones de circulation telle que des aéroports, ou tout autre lieu adapté .  As such, it is simple to achieve. The fuse pole according to the invention can be integrated into any urban or rural environment, it can be used on public roads, in private properties, in car parks, traffic areas such as airports, or any other suitable place.
Il est bien entendu que l'exemple décrit n'est qu'une illustration particulière et en aucun cas limitative des domaines d'application de l'invention. L'Homme de l'art pourra apporter des aménagements de taille, de forme et de matériau à l'exemple de réalisation particulier et au procédé d' installation sans pour autant sortir du cadre de la présente invention.  It is understood that the example described is only a particular illustration and in no way limiting the fields of application of the invention. Those skilled in the art may provide arrangements of size, shape and material to the particular embodiment and the installation method without departing from the scope of the present invention.

Claims

REVENDICATIONS
1 - Mât fusible (1) notamment pour élément de signalisation routière comportant un fût (2) longitudinal pourvu en au moins une extrémité de moyens de fixation (3) destinés à fixer ledit mât fusible (1) sur un support, de sorte que ledit support et ledit mât fusible (1) partagent un plan de jonction transversal (P) , caractérisé en ce que ledit fût (2) comporte au moins une zone d'affaiblissement contrôlée (4), distincte desdits moyens de fixation (3), au niveau de laquelle la structure du matériau est différente de celle des portions dudit fût (2) adjacentes à ladite zone d'affaiblissement contrôlée (4), de sorte que ladite zone d'affaiblissement contrôlée (4) soit réalisée sans enlèvement de matériau et présente un moment résistant maximal inférieur à celui des portions dudit fût (2) adjacentes à ladite zone d'affaiblissement contrôlée (4), ladite zone d'affaiblissement contrôlée (4) étant prévue sur la périphérie dudit fût (2) et étant apte, en cas de choc latéral d'une intensité prédéterminée sur ledit fût (2), à favoriser la déformation puis la rupture dudit fût (2) au niveau de ladite zone d'affaiblissement contrôlée (4), sans orientation préférentielle, pour autoriser au moins la déformation d'une partie dudit fût (2) par rapport auxdits moyens de fixation (3) . 1 - Fusible mast (1) in particular for a road-marking element comprising a longitudinal shaft (2) provided in at least one end with fastening means (3) for fixing said fuse pole (1) on a support, so that said support and said fuse pole (1) share a transverse junction plane (P), characterized in that said shaft (2) comprises at least one controlled weakening zone (4), distinct from said fixing means (3), at at which level the material structure is different from that of the portions of said barrel (2) adjacent to said controlled weakening zone (4), so that said controlled weakening zone (4) is made without removal of material and present a maximum resistance moment lower than that of the portions of said shank (2) adjacent to said controlled weakening zone (4), said controlled weakening zone (4) being provided on the periphery of said shank (2) and being suitable , in the event of a lateral impact of a predetermined intensity on said shank (2), to promote the deformation and then the breaking of said shank (2) at said controlled weakening zone (4), without preferential orientation, to allow the less deformation of a portion of said barrel (2) relative to said fastening means (3).
2 - Mât fusible (1) selon la revendication précédente, caractérisé en ce que ladite zone d'affaiblissement contrôlée (4) a une hauteur (H) prédéterminée comprise entre 10 et 50 mm. 2 - fusible pole (1) according to the preceding claim, characterized in that said controlled weakening zone (4) has a predetermined height (H) of between 10 and 50 mm.
3 - Mât fusible (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ' la zone médiane de ladite zone d'affaiblissement contrôlée (4) est située à une distance (D) dudit plan de jonction transversal (P) , inférieure ou égale à 200 mm. 3 - fusible pole (1) according to any one of the preceding claims, characterized in that the median zone of said controlled weakening zone (4) is located at a distance (D) of said transverse junction plane (P), less than or equal to 200 mm.
4 - Mât fusible (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moyens de fixation comportent une embase (3) transversale formant au moins en partie lesdits moyens de fixation (3) et couplée audit fût (2) par une liaison mécanique —(5), la face inférieure de ladite embase (3) définissant ledit plan de jonction transversal (P) lorsque ledit mât fusible (1) est dans son utilisation normale. 4 - fusible pole (1) according to any one of the preceding claims, characterized in that said fixing means comprise a base (3) transverse forming at least in part said fixing means (3) and coupled to said shaft (2) by a mechanical connection - (5), the lower face of said base (3) defining said transverse junction plane (P) when said fuse pole (1) is in its normal use.
5 - Mât fusible (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit fût (2) comporte une portion destinée à être enterrée dans le sol, cette portion définissant au moins en partie lesdits moyens de fixation, l'intersection entre le sol et ledit fût (2) étant destinée à définir ledit plan de jonction transversal (P) lorsque le mât fusible (1) est dans son utilisation normale. 5 - fusible pole (1) according to any one of the preceding claims, characterized in that said shaft (2) comprises a portion intended to be buried in the ground, this portion defining at least in part said fixing means, the intersection between the ground and said barrel (2) being intended to define said transverse junction plane (P) when the fuse pole (1) is in its normal use.
6 - Mât fusible (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite zone d'affaiblissement contrôlée (4) est continue. 6 - fusible pole (1) according to any one of the preceding claims, characterized in that said controlled weakening zone (4) is continuous.
7 - Mât fusible (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit fût (2) est réalisé dans l'un des matériaux choisi dans le groupe comprenant les alliages d'aluminium, les aciers écrouis, les aciers à haute limite d'élasticité. 7 - Fusible pole (1) according to any one of the preceding claims, characterized in that said shaft (2) is made of one of the materials selected from the group consisting of aluminum alloys, hardened steels, steels with high yield strength.
8 - Procédé d'obtention d'un mât fusible (1), notamment pour élément de signalisation routière, au cours duquel on réalise un fût (2) longitudinal couplé à des moyens de fixation (3) destinés à fixer ledit mât fusible (1) sur un support , de sorte que ledit support et ledit mât fusible (1) partagent un plan de jonction transversal (P) , caractérisé en ce que l'on réalise, sur ledit fût (2), au moins une zone d'affaiblissement contrôlée (4) distincte desdits moyens de fixation (3), au niveau de laquelle on modifie la structure du matériau de sorte que ladite zone d'affaiblissement contrôlée (4) présente un moment résistant maximal inférieur à celui des portions dudit fût (2) adjacentes à ladite zone d'affaiblissement contrôlée (4), ladite zone d'affaiblissement contrôlée (4) étant prévue sur la périphérie dudit fût (2) et étant apte, en cas de choc latéral d'une intensité prédéterminée sur ledit fût (2), à favoriser la déformation puis la rupture dudit fût (2) au niveau de ladite zone d'affaiblissement (4), sans orientation préférentielle, pour autoriser au moins la déformation d'une partie dudit fût (2) par rapport auxdits moyens de fixation (3) . 8 - Method for obtaining a fusible mast (1), in particular for a road signaling element, in which a longitudinal shaft (2) coupled to fastening means (3) for fixing said fusible pole (1) on a support, so that said support and said fusible pole (1) share a transverse junction plane (P), characterized in that one carries out, on said barrel (2), at least one controlled weakening zone (4) distinct from said fixing means (3), at which the structure of the material is modified so that said controlled weakening zone (4) presents a maximum resistance moment less than that of the portions of said shank (2) adjacent to said controlled weakening zone (4), said controlled weakening zone (4) being provided on the periphery of said shank (2) and being capable, in side impact case of a predetermined intensity on said barrel (2), to promote the deformation and rupture of said barrel (2) at said weakening zone (4), without preferential orientation, to allow at least the deformation part of said barrel ( 2) with respect to said fixing means (3).
9 - Procédé selon la revendication 8, caractérisé en ce que l'on réalise ladite zone d'affaiblissement contrôlée (4) par traitement thermique local, sans apport de matière, au moyen d'un dispositif de traitement thermique permettant d' élever localement la température dudit fût (2), au niveau de ladite zone d'affaiblissement contrôlée (4), au-delà de la température de transformation du matériau formant ledit fût (2) . 9 - Process according to claim 8, characterized in that one achieves said controlled weakening zone (4) by local heat treatment, without addition of material, by means of a heat treatment device for locally raising the temperature of said barrel (2), at said controlled weakening zone (4), beyond the transformation temperature of the material forming said barrel (2).
10 - Procédé selon la revendication 8, caractérisé en ce que l'on réalise ladite zone d'affaiblissement contrôlée (4) par fusion locale, sans apport de matière et sans enlèvement de matière, au moyen d'un dispositif de fusion permettant d'élever la température dudit fût (2), localement au niveau de ladite zone d'affaiblissement contrôlée (4), au-delà de la température de transformation du matériau formant ledit fût (2) . 10 - Process according to claim 8, characterized in that said controlled weakening zone (4) is produced by local fusion, without addition of material and without removal of material, by means of a melting device allowing raising the temperature of said barrel (2), locally at said controlled weakening zone (4), beyond the transformation temperature of the material forming said barrel (2).
PCT/FR2011/000615 2010-11-23 2011-11-22 Mast having controlled weakening, in particular for a signaling element and method for producing same WO2012069713A1 (en)

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FR1004561A FR2967697B1 (en) 2010-11-23 2010-11-23 MAT WITH WEAKENING CONTROL IN PARTICULAR FOR SIGNALING ELEMENT AND METHOD OF OBTAINING
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US10767431B2 (en) 2016-03-03 2020-09-08 Halliburton Energy Services, Inc. Inner barrel crimping connection for a coring tool
US10941626B2 (en) 2016-03-03 2021-03-09 Halliburton Energy Services, Inc. Inner barrel shear zone for a coring tool

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FR2967697B1 (en) 2012-12-28
FR2967697A1 (en) 2012-05-25

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