EP3056465B1 - Optimised system for protecting a piece of work - Google Patents

Optimised system for protecting a piece of work Download PDF

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Publication number
EP3056465B1
EP3056465B1 EP15154545.6A EP15154545A EP3056465B1 EP 3056465 B1 EP3056465 B1 EP 3056465B1 EP 15154545 A EP15154545 A EP 15154545A EP 3056465 B1 EP3056465 B1 EP 3056465B1
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EP
European Patent Office
Prior art keywords
jib
boom
net
protection device
ground
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EP15154545.6A
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German (de)
French (fr)
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EP3056465A1 (en
Inventor
Fabrice Vayssade
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes

Definitions

  • the invention relates to a protective device of a structure, especially during maintenance work of overhead power lines supported by towers and passing above said structure.
  • the routing and distribution of electrical energy, from the production centers to the customers, is organized according to one or more interconnected transmission networks.
  • the transmission network generally comprises high voltage or medium voltage overhead power lines hung between two posts or two consecutive pylons.
  • the power lines are hung on the pylons by insulators comprising several elements of assembly and fixing. Each insulator has all the more elements that the voltage is high.
  • the network comprising airlines is required to cross several lands may include a portion of a road, a highway, a railway, or a construction site.
  • this type of solution does not envisage the recovery of assembly and fastening parts that can fall from the pylons.
  • the demand FR 2,778,193 describes a transportable gateway device comprising a support structure of the gateway.
  • the end of the bridge is hinged and carried at the end of the boom of a hoist.
  • the other end of the bridge is articulated to the upper end of a folding support leg.
  • the second mesh of the second net has a rectangular shape whose length is less than 10 mm.
  • the frame of the device comprises a first set of transverse rods attached to the boom extension.
  • the first set of rods and the boom extension being included in the same plane.
  • the transverse rods of the first set are regularly spaced along the longitudinal axis of the boom extension.
  • the transverse rods of the first set are fixed on the boom extension so that when the boom extension is articulated on the boom and is arranged horizontally, the rods of the first set are disposed above the plane. horizontal with the arrow extension.
  • the frame comprises a second set of transverse rods fixed on the boom extension, the second set of rods and being separated from the first set of rods by a vertical plane having the boom extension.
  • the mobile crane comprises means for pivoting the boom extension about an axis perpendicular to the plane comprising the boom and the boom extension and passing through the boom head.
  • the pivoting means are configured to have the boom extension above the horizontal plane including the boom head, so that the boom extension makes a non-zero acute angle with the horizontal plane comprising the head. of arrow.
  • the protection device comprises means for recovering elements received by the first and / or second net.
  • the recovery means are mounted on the boom head.
  • the recovery means are mounted on the boom extension.
  • a protection device taking advantage of the robustness and mobility of a self-propelled crane, usually called a mobile crane, provided with at least one protective and retrieval net.
  • the figure 1 is a side view of a protective device 10 of a terrain T.
  • the device 10 comprises a mobile crane 11 provided with an arrow 12.
  • the device 10 further comprises an extension of boom 13 hinged to the head 12 1 of the arrow 12.
  • the boom extension 13 extends longitudinally along an axis (Ox).
  • mobile crane is meant a crane provided with displacement means generally comprising wheels and / or caterpillars.
  • a mobile crane moves autonomously and is ready for use, unlike a tower crane that is stationary and requires an assembly step on the scene of operations.
  • the mobile crane 11 is completely autonomous, it does not need rails to guide its movement.
  • the boom 12 of the mobile crane 11 can be foldable or telescopic.
  • a mobile crane can be used with an boom up to 60 m or even 80 m long.
  • the boom head 12 1 can thus reach, for some conventional mobile cranes, up to 60 m in height.
  • the height of the boom head is measured relative to the support plane on which the mobile crane 11 is stabilized.
  • Means such as beams, cylinders and support pads can be used for stabilization of the mobile crane 11.
  • the mobile crane 11 generally comprises mechanical means of rotation allowing its boom 12 to rotate about a vertical axis (XX '), and to form an angle ⁇ with a horizontal axis (YY').
  • the angle ⁇ can reach 80 °, thus allowing the head of arrow to reach a height almost equal to the length of the boom, in other words a height approaching 60 m even 80 m.
  • a mobile crane comprises a muffle with hook for lifting and moving loads in a field of operation such as a construction site.
  • the mobile crane 11 is used mainly to form a protection against the fall of various elements on the ground T to be protected.
  • the mobile crane can be exempted from the functions of lifting and moving loads in, to or from the ground T.
  • the boom extension 13 may be steel trellis.
  • the boom extension 13 may comprise several mechanically welded elements 13i, of identical or variable dimensions.
  • the dimensions and the number of mechanically welded elements forming the boom extension 13 depend on the size of the ground to be protected as well as the technical characteristics of the mobile crane 11 used. In particular, the boom length and its mechanical characteristics determine the weight limit to be borne by the boom 12, while ensuring the balance and the stability of the device 10.
  • the device 10 also comprises a transverse rod 14 fixed on the boom extension 13.
  • transverse rod is meant a rod extending along a direction which intersects the longitudinal axis (Ox).
  • the rod 14 may be attached to the boom extension 13 at one of its points.
  • the rod assembly 14 and boom extension 13 form a frame 18.
  • the boom extension 13 and the assembled rod advantageously form a solid frame 18 to receive a cover net configured to protect the ground T.
  • the device 10 comprises a first thread 15 hooked on the framework 18.
  • the net 15 is hooked on the framework 18 and is configured to deploy so as to form a blanket, a sail or a screen configured to protect the body.
  • T. ground T. ground
  • the deployed net 15 is configured to interpose between the ground T and elements 20 which can fall from a position above the protection device 10.
  • the protection device advantageously allows the reception of elements or parts in the event of a fall of a position having a height greater than the height of the device 10 deployed.
  • the protection device 10 can advantageously be installed during maintenance, assembly and disassembly of overhead power lines on a pylon or a pole located near the ground T.
  • the device 10 thus makes it possible to protect the terrain T that may comprise a portion of a road or rail road, an installation, a construction site, etc.
  • the protection device 10 receives the parts and elements intended to hang an overhead power line on the pylon and which can come off during assembly or disassembly of said lines.
  • the protective device prevents the fall of these parts on the ground T. This ensures the safety of operators working within the facility or site located in the ground T, or users of a path traffic passing through the terrain T.
  • the device 10 comprises a second thread 16 hooked on the framework 18 so that it is disposed below the first thread 15.
  • the device 10 comprises successively and going from top to bottom towards the ground T to protect: the first net 15, the second net 16 and the frame 18.
  • the first 15 and second 16 nets have first 15m and second 16m mesh.
  • the dimensions of the first mesh 15m are larger than the dimensions of the second mesh 16m.
  • mesh size is meant the lengths of the sides constituting a mesh.
  • the length of the side of the first mesh 15m is greater than the length of the side of the second mesh 16.
  • the condition on the dimensions of the meshes 15m and 16m is satisfied if the geometric shape of the second mesh 16m can be included in the geometric shape of the second mesh 15m.
  • the first thread 15 has a square mesh of 100 mm ⁇ 100 mm, and it is based on a braided wire preferably polyamide having a diameter of 4.75 mm.
  • the second thread 16 has a rectangular mesh of 2 mm x 6 mm, and is preferably based on polyethylene.
  • the first thread 15 is stapled on the second thread 16, and it is entirely sewn around the periphery of the second thread 16.
  • an additional net advantageously makes it possible to increase the mechanical strength of the nets deployed to receive more or less heavy parts.
  • the use of a second net having a smaller mesh below the first net makes it possible to recover pieces of small sizes, which can pass through the meshes of the first net.
  • the first thread forms a protection for the second net, by losing energy from a coin in free fall during its impact with the first net.
  • the second net recovers the piece in better conditions.
  • the second mesh 16m of the second mesh 16 has a rectangular shape whose length is less than 10 mm.
  • the frame 18 comprises a first set of transverse rods 141 fixed on the boom extension 13.
  • the first set of rods 141 and the boom extension 13 are included in a same plane P1.
  • the rods 141 can be mounted on the upper part of the boom extension 13. Moreover, the rods 141 can be connected to the boom extension 13 and / or between them with tie rods to reinforce the lateral support. .
  • the rods 141 are fixed on the boom extension 13 at their midpoints.
  • the boom extension 13 corresponds to the mediator of the rods 14.
  • each rod 141 is fixed at one of its ends to the boom extension 13.
  • the rods 141 are fixed on the boom extension 13 so that the rods are evenly spaced along the longitudinal axis (Ox).
  • the transverse rods 141 of the first set are fixed on the boom extension 13 so that when the boom extension 13 is hinged to the boom 12 and is disposed horizontally, the rods 141 of the first set are disposed above the horizontal plane including the boom extension 13.
  • the frame 18 comprises a second set of transverse rods 142 fixed on the boom extension 13.
  • the second set of rods 142 is separated from the first set of rods 141 by a vertical plane (P v ) having the boom extension 13.
  • the first set 141 and the second set 142 of transverse rods are arranged symmetrically with respect to the vertical plane (P v ).
  • a rod 142 of the second set is fixed opposite.
  • the rods 141 and 142 assembled on the boom extension 13 have a shape of 'V' whose tip corresponds to the boom extension 13, and the two arms respectively correspond to a rod 141 of the first set and a rod 142 of the second set.
  • the 'V' shape of the section makes it possible to receive the parts which have fallen and to bring them back to the part of the net 15 situated at the level of the boom extension 13 and to gather them at this part of the net 15.
  • first thread 15 and / or the second thread 16 are advantageously flexible threads, for example made of textile or polymer or plastic, and not rigid threads of steel mesh type.
  • the use of a flexible net facilitates the transit and the reception of the pieces fallen in the net and avoids their deterioration during the impact.
  • the mobile crane 11 comprises hinge means 19, for example hydraulic means, allowing the boom extension 13 to pivot about an axis (ZZ ') passing through the boom head 12 1 , and perpendicular to the plane with arrow 12 and boom extension 13.
  • the pivoting means 19 are configured to arrange the boom extension 13 above the horizontal plane (P) including the boom head 12 1 , so that the boom extension 13 makes an acute angle ⁇ not zero with said horizontal plane (P).
  • the boom extension 13 forms an angle ⁇ with the horizontal plane (P).
  • the angle ⁇ can not exceed a limit angle ⁇ max of the order of 70 °, which depends in particular on the weight of the boom extension 13 and its length.
  • the pivoting means 19 are configured so as to allow the boom extension 13 to form an angle ⁇ between 0 ° and 10 ° and even more preferably between 0 ° and 5 °.
  • the first mobile crane 11 is a conventional crane having a lifting capacity of 100 tons.
  • the first crane 11 comprises hydraulic articulation means 19 allowing the boom extension 13 to form an angle ⁇ between 0 and 45 °.
  • the boom extension 13 is formed by two lattice members 13 i having respective lengths of 8 m and 5 m.
  • 16 rods (141, 142) are attached to the rod extension 13.
  • Eight first transverse rods 141 are mounted on the boom extension 13 spaced apart, and eight second rods 142 symmetrical to the first eight 141 relative to each other.
  • vertically (P v ) are also attached to the boom extension 13.
  • the transverse rods 141 and 142 and the boom extension 13 have a shape of 'V' in a front view along the longitudinal axis (Ox).
  • the rods 14 are spaced about 1.8 m apart, and have lengths of about 4 m, allowing a cover width of about 7 m.
  • the device 10 advantageously comprises means 17 for recovering elements received by the first thread 15 or the various threads attached to the framework 18.
  • the recovery means 17 are arranged at the part of the thread or nets having the lowest altitude. In other words, at the part of the net closest to the ground. This arrangement makes it possible to recover the pieces received by the thread or nets and to direct them with the help of the effect of their weight towards the means of recovery.
  • the recovery means 17 are mounted on the boom head 12 1 .
  • the recovery means may comprise a tray mounted on the boom head 12 1 , at the end of the boom extension 13 hinged to the boom head 12 1 .
  • the tray 17 can also be mounted on the boom extension 13.
  • the tray 17 is fixed on the arrow head 12 1 and has a bottom 17 f , preferably formed by a solid surface disposed horizontally.
  • the tray 17 also has side walls 17 p extending in substantially perpendicular and / or inclined directions, relative to the longitudinal axis of the boom 12, from the peripheral edges of the bottom 17 f to the peripheral edges of an open upper surface 17 O.
  • the bottom 17 f preferably comprises an opening system allowing the bottom 17 f to tilt down so as to detach at least partially from the side walls 17 P.
  • Such a system advantageously facilitates the recovery of the elements collected and collected in the bin 17.
  • the net 15 can be hooked on rods 141 belonging to a plane inclined with respect to the horizontal, so as not to cover the boom extension 13.
  • An edge 15 1 of the net 15, extends longitudinally according to the Axis (Ox) so as to be tangent to the boom extension 13.
  • the recovery means 17 are mounted on the boom extension 13.
  • a tray 17 is disposed within the boom extension 13.
  • the tray 17 extends along the axis (Ox) and is arranged to recover the received parts 20 by the net 15.
  • the tray 17, may comprise a side wall 17 p extend from the bottom of the tray 17 f to the upper part of the boom extension 13.
  • the side wall also extends along the axis (Ox) and has an upper portion 17 s inclined upwards.
  • the upper portion 17 s covers the edge of the boom extension 13 and the edge 15 1 of the net.
  • a method of protecting the ground T which can be located near a tower on which maintenance works are envisaged.
  • the protection process provides for the use of a protection device 10 according to one of the embodiments described above.
  • the method comprises a step of placing the mobile crane 11 near the ground T.
  • the location of the crane 11 is chosen according to the nature of the terrain, and the characteristics of the mobile crane.
  • the crane 11 is positioned at the edge of the ground T.
  • characteristics of the mobile crane 11 is meant, in particular, the length of the boom extension 13, and the maximum height it can reach.
  • the crane 11 After placing the mobile crane 11 in a position proximal to the ground T, the crane 11 is deployed.
  • the boom 12 of the mobile crane 11 is deployed at a predefined height, so as to have the boom extension 13 and the net 15 at a certain height.
  • the height of the boom 12, and the inclination of the boom extension 13 are chosen according to the initial positioning of the elements and parts to be recovered, before their falls.
  • the boom extension 13 is disposed 2 m below this initial positioning.
  • the boom 12 and the boom extension 13 are deployed so that the first net 15 interposes between the ground T and elements that can fall from a position above the mobile crane 11.
  • the boom extension 13 is advantageously arranged 2 m below the connection between the overhead lines and the pylon .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

L'invention est relative à un dispositif de protection d'un ouvrage, notamment lors de travaux de maintenance de lignes électriques aériennes soutenues par des pylônes et passant au-dessus dudit ouvrage.The invention relates to a protective device of a structure, especially during maintenance work of overhead power lines supported by towers and passing above said structure.

État de la techniqueState of the art

L'acheminement et la distribution de l'énergie électrique, depuis les centres de production vers les clients, sont organisés selon un ou plusieurs réseaux de transport interconnectés. Le réseau de transport comporte généralement des lignes électriques aériennes haute tension ou moyenne tension accrochées entre deux poteaux ou deux pylônes consécutifs. Les lignes électriques sont accrochées sur les pylônes par des isolateurs comportant plusieurs éléments d'assemblage et de fixation. Chaque isolateur comporte d'autant plus d'éléments que la tension est élevée.The routing and distribution of electrical energy, from the production centers to the customers, is organized according to one or more interconnected transmission networks. The transmission network generally comprises high voltage or medium voltage overhead power lines hung between two posts or two consecutive pylons. The power lines are hung on the pylons by insulators comprising several elements of assembly and fixing. Each insulator has all the more elements that the voltage is high.

Pour couvrir un territoire plus ou moins large, le réseau comportant des lignes aériennes est amené à traverser plusieurs terrains pouvant comporter une portion d'une route, d'une autoroute, d'une voie ferrée, ou encore un chantier de construction.To cover a more or less wide territory, the network comprising airlines is required to cross several lands may include a portion of a road, a highway, a railway, or a construction site.

Lors d'un montage ou d'une maintenance de ces lignes aux points d'intersection avec ces terrains, un problème est rencontré. En effet, au cours des opérations de montage ou démontage des lignes aériennes, les isolateurs et les éléments de fixation sur les pylônes peuvent se détacher et tomber.During assembly or maintenance of these lines at the points of intersection with these lands, a problem is encountered. Indeed, during assembly or disassembly of overhead lines, insulators and fasteners on the pylons can come off and fall.

La chute de ces éléments engendre un problème lié à la sécurité des personnes et/ou des installations pouvant être situées dans ces terrains, et un problème lié à la perte des pièces de fixation et d'assemblage qui sont des pièces spécifiques et onéreuses.The fall of these elements creates a problem related to the safety of people and / or facilities that may be located in these areas, and a problem related to the loss of fasteners and assemblies that are specific and expensive parts.

Pour assurer la sécurité desdits terrains, il faut soit interrompre l'activité dans ces terrains traversés par ces lignes aériennes, soit les protéger. Une telle interruption de l'activité peut s'avérer gênante pour les usagers et pénalisante, d'un point de vue financier, pour l'exploitant de ces installations.To ensure the security of these lands, it is necessary either to interrupt the activity in these lands crossed by these airlines, or to protect them. Such an interruption of the activity can be inconvenient for the users and penalizes, from a financial point of view, for the operator of these installations.

Pour la protection d'ouvrages, la plupart des techniques connues utilisent des échafaudages. Ces techniques nécessitent une interruption plus ou moins longue de l'activité au sein du terrain comportant l'ouvrage pour pouvoir installer les échafaudages.For the protection of structures, most known techniques use scaffolding. These techniques require a more or less long interruption of the activity within the land comprising the structure to be able to install the scaffolding.

En outre ce type de solution n'envisage pas la récupération des pièces d'assemblage et de fixation qui peuvent tomber des pylônes.In addition, this type of solution does not envisage the recovery of assembly and fastening parts that can fall from the pylons.

Par ailleurs, la demande FR 2 778 193 décrit un dispositif de passerelles transportables comportant une structure support de la passerelle. L'extrémité de la passerelle est articulée et portée à l'extrémité de la flèche d'un appareil de levage. L'autre extrémité de la passerelle est articulée à l'extrémité supérieure d'une jambe d'appui dépliable.Moreover, the demand FR 2,778,193 describes a transportable gateway device comprising a support structure of the gateway. The end of the bridge is hinged and carried at the end of the boom of a hoist. The other end of the bridge is articulated to the upper end of a folding support leg.

Objet de l'inventionObject of the invention

Lors de certaines opérations de montage, démontage et/ou de maintenance de lignes électriques aériennes accrochées sur un pylône situé à proximité d'un terrain, il existe un besoin de fournir un dispositif pouvant être installé rapidement et facilement pour protéger ledit terrain, tout en récupérant les pièces destinées à accrocher les lignes électriques sur le pylône, et pouvant se détacher pendant ces opérations.During certain assembly, disassembly and / or maintenance operations of overhead power lines mounted on a pylon located near a field, there is a need to provide a device that can be installed quickly and easily to protect said ground, while recovering parts intended to hang the power lines on the pylon, and can come loose during these operations.

On atteint cet objectif en prévoyant un dispositif de protection d'un terrain, comportant :

  • une grue mobile munie d'une flèche ;
  • une extension de flèche articulée à la tête de la flèche, l'extension de flèche s'étendant longitudinalement selon un axe longitudinal ;
  • une tige transversale fixée sur l'extension de flèche, l'ensemble tige et extension de flèche formant une ossature ;
  • un premier filet accroché sur l'ossature, et configuré pour se déployer de sorte à protéger le terrain en s'interposant entre le terrain et des éléments pouvant chuter d'une position située au-dessus du dispositif de protection; et
un deuxième filet accroché sur l'ossature de sorte qu'il soit disposé en dessous du premier filet. Les premier et deuxième filets ont des première et deuxième mailles, de sorte que les dimensions de la première maille soient plus grandes que les dimensions de la deuxième maille.This objective is achieved by providing a terrain protection device, comprising:
  • a mobile crane equipped with an arrow;
  • an articulated boom extension at the head of the boom, the boom extension extending longitudinally along a longitudinal axis;
  • a transverse rod fixed on the boom extension, the rod assembly and boom extension forming a frame;
  • a first net hooked on the frame, and configured to deploy so as to protect the ground interposed between the ground and elements that can fall from a position above the protective device; and
a second net hooked on the frame so that it is disposed below the first net. The first and second threads have first and second meshes, so that the dimensions of the first stitch are larger than the dimensions of the second stitch.

Préférentiellement, la deuxième maille du deuxième filet a une forme rectangulaire dont la longueur mesure moins de 10 mm.
Selon un mode de réalisation préférentiel, l'ossature du dispositif comporte un premier jeu de tiges transversales fixées sur l'extension de flèche. De manière préférentielle, le premier jeu de tiges et l'extension de flèche étant compris dans un même plan. Selon un perfectionnement, les tiges transversales du premier jeu sont régulièrement espacées selon l'axe longitudinal de l'extension de flèche. Avantageusement, les tiges transversales du premier jeu sont fixées sur l'extension de flèche de sorte que lorsque l'extension de flèche est articulée sur la flèche et est disposée à l'horizontale, les tiges du premier jeu sont disposées au-dessus du plan horizontal comportant l'extension de flèche.
Selon un autre mode de réalisation, l'ossature comporte un deuxième jeu de tiges transversales fixées sur l'extension de flèche, le deuxième jeu de tiges et étant séparé du premier jeu de tiges par un plan vertical comportant l'extension de flèche.Preferably, the second mesh of the second net has a rectangular shape whose length is less than 10 mm.
According to a preferred embodiment, the frame of the device comprises a first set of transverse rods attached to the boom extension. Preferably, the first set of rods and the boom extension being included in the same plane. According to an improvement, the transverse rods of the first set are regularly spaced along the longitudinal axis of the boom extension. Advantageously, the transverse rods of the first set are fixed on the boom extension so that when the boom extension is articulated on the boom and is arranged horizontally, the rods of the first set are disposed above the plane. horizontal with the arrow extension.
According to another embodiment, the frame comprises a second set of transverse rods fixed on the boom extension, the second set of rods and being separated from the first set of rods by a vertical plane having the boom extension.

De manière avantageuse, la grue mobile comporte des moyens de pivotement de l'extension de flèche autour d'un axe perpendiculaire au plan comportant la flèche et l'extension de flèche et passant par la tête de flèche. Préférentiellement, les moyens de pivotement sont configurés de sorte à disposer l'extension de flèche au-dessus du plan horizontal comportant la tête de flèche, de sorte que l'extension de flèche fasse un angle aigu non nul avec le plan horizontal comportant la tête de flèche.Advantageously, the mobile crane comprises means for pivoting the boom extension about an axis perpendicular to the plane comprising the boom and the boom extension and passing through the boom head. Preferably, the pivoting means are configured to have the boom extension above the horizontal plane including the boom head, so that the boom extension makes a non-zero acute angle with the horizontal plane comprising the head. of arrow.

Selon un autre mode de réalisation préférentiel, le dispositif de protection comporte des moyens de récupération d'éléments réceptionnés par le premier et/ou le deuxième filet. De manière préférentielle, les moyens de récupération sont montés sur la tête de flèche. Par ailleurs, selon un autre mode de réalisation, les moyens de récupération sont montés sur l'extension de flèche.According to another preferred embodiment, the protection device comprises means for recovering elements received by the first and / or second net. Preferably, the recovery means are mounted on the boom head. Furthermore, according to another embodiment, the recovery means are mounted on the boom extension.

En outre, on prévoit un procédé de protection d'un terrain comportant les étapes suivantes :

  • prévoir un dispositif selon l'une des revendications précédentes ;
  • placer la grue mobile à proximité du terrain ;
  • déployer la flèche et l'extension de flèche de la grue mobile à une hauteur prédéfinie de sorte que le premier filet s'interposant entre le terrain et des éléments pouvant chuter d'une position au-dessus de la grue mobile.
In addition, there is provided a method of protecting a terrain comprising the following steps:
  • provide a device according to one of the preceding claims;
  • place the mobile crane near the ground;
  • deploy the boom and boom extension of the mobile crane to a predefined height so that the first net interposed between the ground and elements that can fall from a position above the mobile crane.

Description sommaire des dessinsBrief description of the drawings

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés aux dessins annexés, dans lesquels :

  • la figure 1 représente une vue de côté schématique d'un dispositif de protection selon un premier mode de réalisation ;
  • les figures 2 à 4 représentent des vues de dessus schématiques d'ossatures de dispositifs de protection selon d'autres modes de réalisation ;
  • la figure 5 représente une vue en perspective schématique d'une ossature munie d'un bac de récupération d'un dispositif de protection selon un autre mode de réalisation ;
  • la figure 6 représente une vue en perspective schématique d'une partie d'une ossature munie d'un bac de récupération d'un dispositif de protection selon un autre mode de réalisation.
Other advantages and features will emerge more clearly from the following description of particular embodiments of the invention. given as non-limiting examples and shown in the accompanying drawings, in which:
  • the figure 1 is a schematic side view of a protection device according to a first embodiment;
  • the Figures 2 to 4 represent schematic top views of protection device frames according to other embodiments;
  • the figure 5 is a schematic perspective view of a frame provided with a tray for recovering a protection device according to another embodiment;
  • the figure 6 is a schematic perspective view of a portion of a frame provided with a tray for recovering a protection device according to another embodiment.

Description de modes préférentiels de réalisationDescription of preferred embodiments

Pour assurer la protection d'un terrain comportant une portion d'une voie ou une installation, notamment lors de travaux de montage, ou démontage de lignes électriques aériennes sur un pylône ou un poteau, il est avantageux d'utiliser un dispositif facile d'installation pour sécuriser le terrain et récupérer les pièces d'assemblage pouvant chuter du pylône ou du poteau.To ensure the protection of a ground comprising a portion of a track or an installation, especially during assembly work, or disassembly of overhead power lines on a pylon or pole, it is advantageous to use an easy-to-use device. installation to secure the ground and recover assembly parts that can fall from the pylon or pole.

On tend à satisfaire ces exigences en prévoyant un dispositif de protection tirant profit de la robustesse et de la mobilité d'une grue automotrice, usuellement appelée grue mobile, munie d'au moins d'un filet de protection et de récupération.These requirements tend to be met by providing a protection device taking advantage of the robustness and mobility of a self-propelled crane, usually called a mobile crane, provided with at least one protective and retrieval net.

La figure 1 représente une vue de côté d'un dispositif de protection 10 d'un terrain T. Le dispositif 10 comporte une grue mobile 11 munie d'une flèche 12. Le dispositif 10 comporte en outre une extension de flèche 13 articulée à la tête 121 de la flèche 12. L'extension de flèche 13 s'étend longitudinalement selon un axe (Ox).The figure 1 is a side view of a protective device 10 of a terrain T. The device 10 comprises a mobile crane 11 provided with an arrow 12. The device 10 further comprises an extension of boom 13 hinged to the head 12 1 of the arrow 12. The boom extension 13 extends longitudinally along an axis (Ox).

Par grue mobile on entend une grue munie de moyens de déplacement comportant généralement des roues et/ou des chenilles. Une grue mobile se déplace de manière autonome et elle est prête à l'emploi, contrairement à une grue à tour qui est fixe et nécessite une étape d'assemblage sur les lieux des opérations. Préférentiellement, la grue mobile 11 est totalement autonome, elle n'a pas besoin de rails pour guider son déplacement.By mobile crane is meant a crane provided with displacement means generally comprising wheels and / or caterpillars. A mobile crane moves autonomously and is ready for use, unlike a tower crane that is stationary and requires an assembly step on the scene of operations. Preferably, the mobile crane 11 is completely autonomous, it does not need rails to guide its movement.

La flèche 12 de la grue mobile 11 peut être pliable ou télescopique. On peut utiliser une grue mobile ayant une flèche pouvant atteindre jusqu'à 60 m voire 80 m de longueur.The boom 12 of the mobile crane 11 can be foldable or telescopic. A mobile crane can be used with an boom up to 60 m or even 80 m long.

La tête de flèche 121 peut ainsi atteindre, pour certaines grues mobiles classiques, jusqu'à 60 m de hauteur. La hauteur de la tête de flèche est mesurée par rapport au plan d'appui sur lequel la grue mobile 11 est stabilisée.The boom head 12 1 can thus reach, for some conventional mobile cranes, up to 60 m in height. The height of the boom head is measured relative to the support plane on which the mobile crane 11 is stabilized.

Des moyens tels que des poutres, des vérins et des patins d'appui peuvent être utilisés pour la stabilisation de la grue mobile 11.Means such as beams, cylinders and support pads can be used for stabilization of the mobile crane 11.

La grue mobile 11 comporte généralement des moyens mécaniques de rotation permettant à sa flèche 12 de tourner autour d'un axe vertical (XX'), et de former un angle α avec un axe horizontal (YY'). L'angle α peut atteindre 80°, permettant ainsi à la tête de flèche d'atteindre une hauteur presque égale à la longueur de la flèche, autrement dit une hauteur avoisinant 60 m voire 80 m.The mobile crane 11 generally comprises mechanical means of rotation allowing its boom 12 to rotate about a vertical axis (XX '), and to form an angle α with a horizontal axis (YY'). The angle α can reach 80 °, thus allowing the head of arrow to reach a height almost equal to the length of the boom, in other words a height approaching 60 m even 80 m.

De manière usuelle, une grue mobile comporte un moufle avec crochet destiné au levage et au déplacement de charges dans un terrain d'opération tel qu'un chantier de construction.Usually, a mobile crane comprises a muffle with hook for lifting and moving loads in a field of operation such as a construction site.

Selon l'invention, la grue mobile 11 est utilisée principalement pour former une protection contre la chute de divers éléments sur le terrain T à protéger. Autrement dit, la grue mobile peut être dispensée des fonctions de levage et de déplacement de charges dans, vers ou depuis le terrain T.According to the invention, the mobile crane 11 is used mainly to form a protection against the fall of various elements on the ground T to be protected. In other words, the mobile crane can be exempted from the functions of lifting and moving loads in, to or from the ground T.

L'extension de flèche 13 peut être en treillis d'acier. De manière préférentielle, l'extension de flèche 13 peut comporter plusieurs éléments mécano soudés 13i, de dimensions identiques ou variables. Les dimensions et le nombre des éléments mécano soudés formant l'extension de flèche 13 dépendent de la dimension du terrain à protéger ainsi que des caractéristiques techniques de la grue mobile 11 utilisée. Notamment, la longueur de flèche et ses caractéristiques mécaniques déterminent le poids limite à supporter par la flèche 12, tout en assurant l'équilibre et la stabilité du dispositif 10.The boom extension 13 may be steel trellis. Preferably, the boom extension 13 may comprise several mechanically welded elements 13i, of identical or variable dimensions. The dimensions and the number of mechanically welded elements forming the boom extension 13 depend on the size of the ground to be protected as well as the technical characteristics of the mobile crane 11 used. In particular, the boom length and its mechanical characteristics determine the weight limit to be borne by the boom 12, while ensuring the balance and the stability of the device 10.

Comme illustré à la figure 2, le dispositif 10 comporte également une tige 14 transversale fixée sur l'extension de flèche 13. Par tige transversale, on entend une tige s'étendant le long d'une direction qui coupe l'axe longitudinal (Ox). La tige 14 peut être fixée sur l'extension de flèche 13 au niveau d'un de ses points.As illustrated in figure 2 , the device 10 also comprises a transverse rod 14 fixed on the boom extension 13. By transverse rod is meant a rod extending along a direction which intersects the longitudinal axis (Ox). The rod 14 may be attached to the boom extension 13 at one of its points.

L'ensemble tige 14 et extension de flèche 13 forme une ossature 18. Autrement dit, l'extension de flèche 13 et la tige assemblée dessus forment avantageusement une ossature 18 solide pour recevoir un filet de couverture configuré pour protéger le terrain T.The rod assembly 14 and boom extension 13 form a frame 18. In other words, the boom extension 13 and the assembled rod advantageously form a solid frame 18 to receive a cover net configured to protect the ground T.

Avantageusement, le dispositif 10 comporte un premier filet 15 accroché sur l'ossature 18. Le filet 15 est accroché sur l'ossature 18 et il est configuré pour se déployer de sorte à former une couverture, un voile ou un écran configurés pour protéger le terrain T.Advantageously, the device 10 comprises a first thread 15 hooked on the framework 18. The net 15 is hooked on the framework 18 and is configured to deploy so as to form a blanket, a sail or a screen configured to protect the body. T. ground

Le filet déployé 15 est configuré de sorte à s'interposer entre le terrain T et des éléments 20 pouvant chuter d'une position située au-dessus du dispositif de protection 10.The deployed net 15 is configured to interpose between the ground T and elements 20 which can fall from a position above the protection device 10.

Ainsi, le dispositif de protection permet avantageusement la réception d'éléments ou de pièces en cas de chute d'une position ayant une hauteur supérieure à la hauteur du dispositif 10 déployé.Thus, the protection device advantageously allows the reception of elements or parts in the event of a fall of a position having a height greater than the height of the device 10 deployed.

Actuellement on peut disposer d'une grue mobile munie d'une flèche télescopique, longue et mécaniquement solide pouvant supporter une charge de quelques tonnes voire des dizaines de tonnes. En utilisant ce type de grues mobiles et une extension de flèche munie d'au moins une tige et d'un filet, on obtient un dispositif de protection 10 robuste, efficace et fiable. En outre, l'extension de flèche 13 peut atteindre des hauteurs importantes pouvant atteindre 60 m si besoin.Currently we can have a mobile crane with a telescopic boom, long and mechanically strong can withstand a load of a few tons or even tens of tons. By using this type of mobile cranes and an boom extension provided with at least one rod and one net, a robust, efficient and reliable protection device 10 is obtained. In addition, the boom extension 13 can reach heights of up to 60 m if necessary.

Comme exemple d'utilisation, le dispositif de protection 10 peut être installé, de manière avantageuse lors de la maintenance, du montage et démontage de lignes électriques aériennes sur un pylône ou un poteau situé à proximité du terrain T. Le dispositif 10 permet ainsi de protéger le terrain T pouvant comporter une portion d'une voie routière ou ferroviaire, une installation, un chantier, etc.As an example of use, the protection device 10 can advantageously be installed during maintenance, assembly and disassembly of overhead power lines on a pylon or a pole located near the ground T. The device 10 thus makes it possible to protect the terrain T that may comprise a portion of a road or rail road, an installation, a construction site, etc.

Dans ces conditions, le dispositif de protection 10 réceptionne les pièces et éléments destinés à accrocher une ligne électrique aérienne sur le pylône et qui peuvent se détacher lors des opérations de montage ou démontage desdites lignes. Ainsi, le dispositif de protection empêche la chute de ces pièces sur le terrain T. Ce qui permet d'assurer la sécurité des opérateurs travaillant au sein de l'installation ou du chantier situés dans le terrain T, ou des usagers d'une voie de circulation passant par le terrain T.Under these conditions, the protection device 10 receives the parts and elements intended to hang an overhead power line on the pylon and which can come off during assembly or disassembly of said lines. Thus, the protective device prevents the fall of these parts on the ground T. This ensures the safety of operators working within the facility or site located in the ground T, or users of a path traffic passing through the terrain T.

En outre, l'utilisation d'un filet au lieu d'un élément plein permet avantageusement de diminuer la prise au vent.In addition, the use of a net instead of a solid element advantageously makes it possible to reduce wind resistance.

Selon un mode préférentiel de réalisation illustré à la figure 3, le dispositif 10 comporte un deuxième filet 16 accroché sur l'ossature 18 de sorte qu'il soit disposé en dessous du premier filet 15. Autrement dit, le dispositif 10 comporte successivement et allant de haut en bas vers le terrain T à protéger: le premier filet 15, le deuxième filet 16 et l'ossature 18. Les premier 15 et deuxième 16 filets ont des première 15m et deuxième 16m mailles. Selon ce mode de réalisation, les dimensions de la première maille 15m sont plus grandes que les dimensions de la deuxième maille 16m.According to a preferred embodiment illustrated in figure 3 , the device 10 comprises a second thread 16 hooked on the framework 18 so that it is disposed below the first thread 15. In other words, the device 10 comprises successively and going from top to bottom towards the ground T to protect: the first net 15, the second net 16 and the frame 18. The first 15 and second 16 nets have first 15m and second 16m mesh. According to this embodiment, the dimensions of the first mesh 15m are larger than the dimensions of the second mesh 16m.

Par dimensions de maille on entend les longueurs des côtés constituant une maille. Par exemple, pour des mailles de forme carrée, la longueur du côté de la première maille 15m est plus grande que la longueur du côté de la deuxième maille 16. La condition sur les dimensions des mailles 15m et 16m est satisfaite si la forme géométrique de la deuxième maille 16m peut être incluse dans la forme géométrique de la deuxième maille 15m.By mesh size is meant the lengths of the sides constituting a mesh. For example, for meshes of square shape, the length of the side of the first mesh 15m is greater than the length of the side of the second mesh 16. The condition on the dimensions of the meshes 15m and 16m is satisfied if the geometric shape of the second mesh 16m can be included in the geometric shape of the second mesh 15m.

Selon un exemple de réalisation, le premier filet 15 possède une maille carrée de 100 mm x 100 mm, et il est à base d'un fil tressé de préférence en polyamide ayant un diamètre de 4,75 mm. Le deuxième filet 16 possède une maille rectangulaire de 2 mm x 6 mm, et il est de préférence à base de polyéthylène. Le premier filet 15 est agrafé sur le deuxième filet 16, et il est entièrement cousu au pourtour du deuxième filet 16.According to an exemplary embodiment, the first thread 15 has a square mesh of 100 mm × 100 mm, and it is based on a braided wire preferably polyamide having a diameter of 4.75 mm. The second thread 16 has a rectangular mesh of 2 mm x 6 mm, and is preferably based on polyethylene. The first thread 15 is stapled on the second thread 16, and it is entirely sewn around the periphery of the second thread 16.

L'adjonction d'un filet supplémentaire permet avantageusement d'augmenter la solidité mécanique des filets déployés pour recevoir des pièces plus ou moins lourdes. En outre, l'utilisation d'un deuxième filet ayant une maille plus petite en dessous du premier filet permet de récupérer des pièces de petites tailles, et qui peuvent passer à travers les mailles du premier filet. De manière avantageuse, le premier filet forme une protection pour le deuxième filet, en faisant perdre de l'énergie d'une pièce en chute libre lors de son impact avec le premier filet. Ainsi, le deuxième filet récupère la pièce dans de meilleures conditions.The addition of an additional net advantageously makes it possible to increase the mechanical strength of the nets deployed to receive more or less heavy parts. In addition, the use of a second net having a smaller mesh below the first net makes it possible to recover pieces of small sizes, which can pass through the meshes of the first net. Advantageously, the first thread forms a protection for the second net, by losing energy from a coin in free fall during its impact with the first net. Thus, the second net recovers the piece in better conditions.

Selon un mode de réalisation, la deuxième maille 16m du deuxième filet 16 a une forme rectangulaire dont longueur mesure moins de 10 mm.According to one embodiment, the second mesh 16m of the second mesh 16 has a rectangular shape whose length is less than 10 mm.

Selon un mode de réalisation préférentiel illustré à la figure 4, l'ossature 18 comporte un premier jeu de tiges 141 transversales fixées sur l'extension de flèche 13. De manière préférentielle, le premier jeu de tiges 141 et l'extension de flèche 13 sont compris dans un même plan P1.According to a preferred embodiment illustrated in figure 4 , the frame 18 comprises a first set of transverse rods 141 fixed on the boom extension 13. Preferably, the first set of rods 141 and the boom extension 13 are included in a same plane P1.

Les tiges 141 peuvent être montées sur la partie supérieure de l'extension de flèche 13. Par ailleurs, les tiges 141 peuvent être reliées à l'extension de flèche 13 et/ou entre elles à l'aide de tirants pour renforcer le maintien latéral.The rods 141 can be mounted on the upper part of the boom extension 13. Moreover, the rods 141 can be connected to the boom extension 13 and / or between them with tie rods to reinforce the lateral support. .

Selon un mode de réalisation, les tiges 141 sont fixées sur l'extension de flèche 13 au niveau de leurs milieux. Autrement dit, d'un point de vue géométrique, l'extension de flèche 13 correspond à la médiatrice des tiges 14.According to one embodiment, the rods 141 are fixed on the boom extension 13 at their midpoints. In other words, from a geometric point of view, the boom extension 13 corresponds to the mediator of the rods 14.

Selon l'exemple préférentiel de réalisation de la figure 5, chaque tige 141 est fixée à une de ses extrémités à l'extension de flèche 13. Préférentiellement, les tiges 141 sont fixées sur l'extension de flèche 13 de sorte que les tiges soient régulièrement espacées selon l'axe longitudinal (Ox).According to the preferred embodiment of the figure 5 each rod 141 is fixed at one of its ends to the boom extension 13. Preferably, the rods 141 are fixed on the boom extension 13 so that the rods are evenly spaced along the longitudinal axis (Ox).

Selon une variante de réalisation, les tiges transversales 141 du premier jeu sont fixées sur l'extension de flèche 13 de sorte que lorsque l'extension de flèche 13 est articulée sur la flèche 12 et est disposée à l'horizontale, les tiges 141 du premier jeu sont disposées au-dessus du plan horizontal comportant l'extension de flèche 13.According to an alternative embodiment, the transverse rods 141 of the first set are fixed on the boom extension 13 so that when the boom extension 13 is hinged to the boom 12 and is disposed horizontally, the rods 141 of the first set are disposed above the horizontal plane including the boom extension 13.

Selon un autre mode de réalisation illustré également à la figure 5, l'ossature 18 comporte un deuxième jeu de tiges 142 transversales fixées sur l'extension de flèche 13. Le deuxième jeu de tiges 142 est séparé du premier jeu de tiges 141 par un plan vertical (Pv) comportant l'extension de flèche 13.According to another embodiment also illustrated in figure 5 , the frame 18 comprises a second set of transverse rods 142 fixed on the boom extension 13. The second set of rods 142 is separated from the first set of rods 141 by a vertical plane (P v ) having the boom extension 13.

De manière préférentielle, le premier jeu 141 et le deuxième jeu 142 de tiges transversales sont disposées de manière symétrique par rapport au plan vertical (Pv). Pour chaque tige 141 du premier jeu, fixée sur l'extension de flèche 13, une tige 142 du deuxième jeu est fixée en face.Preferably, the first set 141 and the second set 142 of transverse rods are arranged symmetrically with respect to the vertical plane (P v ). For each rod 141 of the first set, fixed on the boom extension 13, a rod 142 of the second set is fixed opposite.

Autrement dit, selon une vue de face selon l'axe longitudinal (Ox), les tiges 141 et 142 assemblées sur l'extension de flèche 13 ont une forme en 'V' dont la pointe correspond à l'extension de flèche 13, et les deux bras correspondent respectivement à une tige 141 du premier jeu et une tige 142 du deuxième jeu.In other words, according to a front view along the longitudinal axis (Ox), the rods 141 and 142 assembled on the boom extension 13 have a shape of 'V' whose tip corresponds to the boom extension 13, and the two arms respectively correspond to a rod 141 of the first set and a rod 142 of the second set.

Lorsque le filet 15 est accroché sur l'ossature 18, la forme en 'V' de la coupe permet de réceptionner les pièces qui ont chuté et de les ramener vers la partie du filet 15 située au niveau de l'extension de flèche 13 et de les rassembler au niveau de cette partie du filet 15.When the net 15 is hooked on the framework 18, the 'V' shape of the section makes it possible to receive the parts which have fallen and to bring them back to the part of the net 15 situated at the level of the boom extension 13 and to gather them at this part of the net 15.

Ainsi, il est facile de récupérer les pièces spécifiques et onéreuses qui se sont détachées et ont chuté lors des opérations de maintenance, pour une éventuelle réutilisation.Thus, it is easy to recover specific and expensive parts that have become detached and dropped during maintenance operations, for possible reuse.

Par ailleurs, le premier filet 15 et/ou le deuxième filet 16 sont avantageusement des filets souples, par exemple en textile ou en polymère ou en plastique, et non des filets rigides de type treillis en acier. L'utilisation d'un filet souple facilite le transit et la réception des pièces tombées dans le filet et évite leurs détériorations lors de l'impact.Moreover, the first thread 15 and / or the second thread 16 are advantageously flexible threads, for example made of textile or polymer or plastic, and not rigid threads of steel mesh type. The use of a flexible net facilitates the transit and the reception of the pieces fallen in the net and avoids their deterioration during the impact.

Selon un mode préférentiel illustré à la figure 1, la grue mobile 11 comporte des moyens d'articulation 19, par exemple des moyens hydrauliques, permettant à l'extension de flèche 13 de pivoter autour d'un axe (ZZ') passant par la tête de flèche 121, et perpendiculaire au plan comportant la flèche 12 et l'extension de flèche 13.According to a preferential mode illustrated at figure 1 , the mobile crane 11 comprises hinge means 19, for example hydraulic means, allowing the boom extension 13 to pivot about an axis (ZZ ') passing through the boom head 12 1 , and perpendicular to the plane with arrow 12 and boom extension 13.

De manière avantageuse, les moyens de pivotement 19 sont configurés pour disposer l'extension de flèche 13 au-dessus du plan horizontal (P) comportant la tête de flèche 121, de sorte que l'extension de flèche 13 fasse un angle aigu β non nul avec ledit plan horizontal (P).Advantageously, the pivoting means 19 are configured to arrange the boom extension 13 above the horizontal plane (P) including the boom head 12 1 , so that the boom extension 13 makes an acute angle β not zero with said horizontal plane (P).

Comme illustré à la figure 1, l'extension de flèche 13 forme un angle β avec le plan horizontal (P). Généralement, l'angle β ne peut dépasser un angle limite βmax de l'ordre de 70°, qui dépend notamment du poids de l'extension de flèche 13 et de sa longueur. Préférentiellement, les moyens de pivotement 19 sont configurés de sorte à permettre à l'extension de flèche 13 de former un angle β compris entre 0° et 10° et de manière encore plus préférentielle entre 0° et 5°.As illustrated in figure 1 the boom extension 13 forms an angle β with the horizontal plane (P). Generally, the angle β can not exceed a limit angle β max of the order of 70 °, which depends in particular on the weight of the boom extension 13 and its length. Preferably, the pivoting means 19 are configured so as to allow the boom extension 13 to form an angle β between 0 ° and 10 ° and even more preferably between 0 ° and 5 °.

Selon un exemple de réalisation, la première grue mobile 11 est une grue classique ayant une capacité de levage de 100 tonnes. La première grue 11 comporte des moyens d'articulation 19 hydrauliques permettant à l'extension de flèche 13 de former un angle β compris entre 0 et 45°. L'extension de flèche 13 est formée par deux éléments 13i en treillis, ayant des longueurs respectives de 8 m et de 5 m.According to an exemplary embodiment, the first mobile crane 11 is a conventional crane having a lifting capacity of 100 tons. The first crane 11 comprises hydraulic articulation means 19 allowing the boom extension 13 to form an angle β between 0 and 45 °. The boom extension 13 is formed by two lattice members 13 i having respective lengths of 8 m and 5 m.

Par ailleurs, 16 tiges (141, 142) sont fixées sur l'extension de tige 13. Huit premières tiges transversales 141 sont montées sur l'extension de flèche 13 de manière espacée, et huit secondes tiges 142 symétriques aux huit premières 141 par rapport au plan vertical (Pv) sont également fixées sur l'extension de flèche 13.On the other hand, 16 rods (141, 142) are attached to the rod extension 13. Eight first transverse rods 141 are mounted on the boom extension 13 spaced apart, and eight second rods 142 symmetrical to the first eight 141 relative to each other. vertically (P v ) are also attached to the boom extension 13.

Comme illustré à la figure 5, les tiges transversales 141 et 142 et l'extension de flèche 13 ont une forme en 'V' selon une vue de face selon l'axe longitudinal (Ox). Les tiges 14 sont espacées d'environ 1,8 m, et elles ont des longueurs d'environ 4 m, permettant une largeur I de couverture d'environ 7 m.As illustrated in figure 5 , the transverse rods 141 and 142 and the boom extension 13 have a shape of 'V' in a front view along the longitudinal axis (Ox). The rods 14 are spaced about 1.8 m apart, and have lengths of about 4 m, allowing a cover width of about 7 m.

Selon un mode de réalisation préférentiel illustré aux figures 5 et 6, le dispositif 10 comporte avantageusement des moyens de récupération 17 d'éléments réceptionnés par le premier filet 15 ou les différents filets accrochés à l'ossature 18.According to a preferred embodiment illustrated in figures 5 and 6 , the device 10 advantageously comprises means 17 for recovering elements received by the first thread 15 or the various threads attached to the framework 18.

Préférentiellement, les moyens de récupération 17 sont disposés au niveau de la partie du ou des filets ayant l'altitude la plus faible. Autrement dit, au niveau de la partie du filet la plus proche du sol. Cet agencement, permet de récupérer les pièces réceptionnées par le ou les filets, et les diriger avec l'aide de l'effet de leurs poids vers les moyens de récupération.Preferably, the recovery means 17 are arranged at the part of the thread or nets having the lowest altitude. In other words, at the part of the net closest to the ground. This arrangement makes it possible to recover the pieces received by the thread or nets and to direct them with the help of the effect of their weight towards the means of recovery.

Selon un mode de réalisation préférentiel illustré à la figure 5, les moyens de récupération 17 sont montés sur la tête de flèche 121. Les moyens de récupération peuvent comporter un bac monté sur la tête de flèche 121, au niveau de l'extrémité de l'extension de flèche 13 articulée sur la tête de flèche 121. Par ailleurs, le bac 17 peut également être monté sur l'extension de flèche 13.According to a preferred embodiment illustrated in figure 5 , the recovery means 17 are mounted on the boom head 12 1 . The recovery means may comprise a tray mounted on the boom head 12 1 , at the end of the boom extension 13 hinged to the boom head 12 1 . Moreover, the tray 17 can also be mounted on the boom extension 13.

Comme illustré à la figure 5, le bac 17 est fixé sur la tête de flèche 121 et comporte un fond 17f, préférentiellement formé par une surface pleine disposée à l'horizontale. Le bac 17 comporte également des parois latérales 17p s'étendant selon des directions sensiblement perpendiculaire et/ou inclinées, par rapport à l'axe longitudinal de la flèche 12, depuis les bords périphériques du fond 17f jusqu'aux bords périphériques d'une surface supérieure ouverte 17O.As illustrated in figure 5 , the tray 17 is fixed on the arrow head 12 1 and has a bottom 17 f , preferably formed by a solid surface disposed horizontally. The tray 17 also has side walls 17 p extending in substantially perpendicular and / or inclined directions, relative to the longitudinal axis of the boom 12, from the peripheral edges of the bottom 17 f to the peripheral edges of an open upper surface 17 O.

Le fond 17f comporte préférentiellement un système d'ouverture permettant au fond 17f de basculer vers le bas de sorte à se détacher au moins partiellement des parois latérales 17P. Un tel système permet avantageusement de faciliter la récupération des éléments rassemblés et collectés dans le bac 17.The bottom 17 f preferably comprises an opening system allowing the bottom 17 f to tilt down so as to detach at least partially from the side walls 17 P. Such a system advantageously facilitates the recovery of the elements collected and collected in the bin 17.

Le bac de récupération 17 associé à une extension de flèche 13 disposée de manière inclinée par rapport à l'horizontale, permet de manière avantageuse, de récupérer les éléments réceptionnés par le filet 15, de les diriger et de les rassembler dans le bac de récupération 17.The recovery tank 17 associated with an extension of boom 13 arranged inclined relative to the horizontal, advantageously allows to recover the elements received by the net 15, direct them and collect them in the recovery tank 17.

Selon un autre exemple de réalisation illustré à la figure 6, le filet 15 peut être accroché sur des tiges 141 appartenant à un plan incliné par rapport à l'horizontal, de manière à ne pas couvrir l'extension de flèche 13. Un bord 151 du filet 15, s'étend longitudinalement selon l'axe (Ox) de manière à être tangent à l'extension de flèche 13. De manière avantageuse, les moyens de récupération 17 sont montés sur l'extension de flèche 13.According to another exemplary embodiment illustrated in figure 6 , the net 15 can be hooked on rods 141 belonging to a plane inclined with respect to the horizontal, so as not to cover the boom extension 13. An edge 15 1 of the net 15, extends longitudinally according to the Axis (Ox) so as to be tangent to the boom extension 13. Advantageously, the recovery means 17 are mounted on the boom extension 13.

A titre d'exemple, un bac 17 est disposé à l'intérieur de l'extension de flèche 13. Le bac 17 s'étend le long de l'axe (Ox) et il est agencé de sorte à récupérer les pièces réceptionnées 20 par le filet 15. Le bac 17, peut comporter une paroi latérale 17p s'étendent du fond du bac 17f vers la partie supérieure de l'extension de flèche 13. La paroi latérale s'étend également le long de l'axe (Ox) et comporte une portion supérieure 17s inclinée vers le haut. La portion supérieure 17s recouvre le bord de l'extension de flèche 13 et le bord 151 du filet. Ainsi, on évite que des pièces réceptionnées par le filet 15 ne restent coincées sur le bord supérieur de l'extension de flèche adjacent au bord du filet 151.For example, a tray 17 is disposed within the boom extension 13. The tray 17 extends along the axis (Ox) and is arranged to recover the received parts 20 by the net 15. The tray 17, may comprise a side wall 17 p extend from the bottom of the tray 17 f to the upper part of the boom extension 13. The side wall also extends along the axis (Ox) and has an upper portion 17 s inclined upwards. The upper portion 17 s covers the edge of the boom extension 13 and the edge 15 1 of the net. Thus, it is avoided that pieces received by the net 15 remain stuck on the upper edge of the boom extension adjacent to the edge of the net 15 1 .

De manière avantageuse, on prévoit également un procédé de protection du terrain T pouvant être situé à proximité d'un pylône sur lequel des travaux de maintenances sont envisagés. Le procédé de protection prévoit l'utilisation d'un dispositif de protection 10 selon un des modes de réalisation décrits ci-dessus.Advantageously, there is also provided a method of protecting the ground T which can be located near a tower on which maintenance works are envisaged. The protection process provides for the use of a protection device 10 according to one of the embodiments described above.

En outre, le procédé comporte une étape consistant à placer la grue mobile 11 à proximité du terrain T. L'emplacement de la grue 11 est choisi en fonction de la nature du terrain, et des caractéristiques de la grue mobile.In addition, the method comprises a step of placing the mobile crane 11 near the ground T. The location of the crane 11 is chosen according to the nature of the terrain, and the characteristics of the mobile crane.

Par nature du terrain, on entend les caractéristiques topographiques du terrain et le niveau d'accessibilité dudit terrain. Préférentiellement, la grue 11 est positionnée au bord du terrain T.By nature of the terrain, we mean the topographical features of the land and the level of accessibility of the land. Preferably, the crane 11 is positioned at the edge of the ground T.

Par caractéristiques de la grue mobile 11, on entend notamment, la longueur de l'extension de flèche 13, et la hauteur maximale qu'elle peut atteindre.By characteristics of the mobile crane 11 is meant, in particular, the length of the boom extension 13, and the maximum height it can reach.

Après avoir placé la grue mobile 11 dans une position proximale du terrain T, la grue 11 est déployée. Autrement dit, on déploie la flèche 12 de la grue mobile 11 à une hauteur prédéfinie, de sorte à disposer l'extension de flèche 13 et le filet 15 à une certaine hauteur.After placing the mobile crane 11 in a position proximal to the ground T, the crane 11 is deployed. In other words, the boom 12 of the mobile crane 11 is deployed at a predefined height, so as to have the boom extension 13 and the net 15 at a certain height.

La hauteur de la flèche 12, et l'inclinaison de l'extension de flèche 13 sont choisies en fonction du positionnement initial des éléments et des pièces à récupérer, avant leurs chutes. Avantageusement, l'extension de flèche 13 est disposée à 2 m en dessous de ce positionnement initial.The height of the boom 12, and the inclination of the boom extension 13 are chosen according to the initial positioning of the elements and parts to be recovered, before their falls. Advantageously, the boom extension 13 is disposed 2 m below this initial positioning.

La flèche 12 et l'extension de flèche 13 sont déployées de sorte que le premier filet 15 s'interpose entre le terrain T et des éléments pouvant chuter d'une position au-dessus de la grue mobile 11.The boom 12 and the boom extension 13 are deployed so that the first net 15 interposes between the ground T and elements that can fall from a position above the mobile crane 11.

Selon un exemple de réalisation dans lequel le dispositif 10 est destiné à protéger un terrain lors de travaux de maintenances effectués sur un pylône, l'extension de flèche 13 est avantageusement disposée à 2 m en dessous de la connexion entre les lignes aériennes et le pylône.According to an exemplary embodiment in which the device 10 is intended to protect a ground during maintenance work carried out on a pylon, the boom extension 13 is advantageously arranged 2 m below the connection between the overhead lines and the pylon .

Claims (12)

  1. Protection device (10) for protecting a piece of ground (T), comprising:
    - a mobile crane (11) equipped with a boom (12);
    - a jib (13) articulated on the boom point (121) at the head of the boom (12), the jib (13) extending longitudinally along a longitudinal axis (Ox);
    - a transverse jib strut (14) fixed to the jib (13), the assembly formed by the strut (14) and jib (13) forming a framework (18);
    characterized in that it comprises:
    - a first net (15) attached to the framework (18) and configured to be unfurled so as to protect the ground (T) by placing itself between the ground (T) and items able to fall from a position located above the protection device (10); and
    - a second net (16) attached to the framework (18) so that it is arranged underneath the first net (15), and in that the first net (15) and the second net (16) have a first mesh (15m) and a second mesh (16m), the dimensions of the first mesh (15m) being larger than the dimensions of the second mesh (16m).
  2. Protection device according to claim 1, wherein the second mesh (16m) of the second net (16) is of rectangular shape, the length of the rectangular shape measuring less than 10 mm.
  3. Protection device (10) according to one of the foregoing claims, wherein the framework (18) comprises a first set of transverse struts (141) fixed onto the jib (13), the first set of struts (141) and the jib being comprised in the same plane (P1).
  4. Protection device (10) according to claim 3, wherein the transverse struts (141) of the first set are spaced apart regularly along the longitudinal axis (Ox).
  5. Protection device (10) according to one of claims 3 and 4, wherein the transverse struts (141) of the first set are fixed to the jib (13) so that when the jib (13) is articulated on the boom (12) and is arranged in horizontal manner, the struts (141) of the first set are located above the horizontal plane comprising the jib (13).
  6. Protection device (10) according to one of claims 3 to 5, wherein the framework (18) comprises a second set of transverse struts (142) fixed onto the jib (13), the second set of struts (142) being separated from the first set of struts (141) by a vertical plane (Pv) comprising the jib (13).
  7. Protection device (10) according to one of the foregoing claims, wherein the crane (11) comprises pivot means (19) to make the jib (13) swivel around an axis (ZZ') perpendicular to the plane containing the boom (12) and jib (13) and passing through the boom point (121).
  8. Protection device according to claim 7, wherein the pivot means are configured so as to locate the jib (13) above the horizontal plane (P) comprising the boom point (121), so that the jib (13) forms an acute angle (b) that is not zero with the horizontal plane (P) containing the boom point (121).
  9. Protection device according to one of the foregoing claims, characterised in that it comprises means for retrieving (17) items received by the first net (15) and/or the second net (16).
  10. Protection device according to claim 9, wherein the means for retrieving (17) are mounted on the boom point (121).
  11. Protection device according to claim 9, wherein the means for retrieving (17) are mounted on the jib (13).
  12. Method for protecting a piece of ground (T) comprising the following steps:
    • providing a device according to one of the foregoing claims;
    • placing the mobile crane (11) alongside the piece of ground (T);
    • deploying the boom (12) and jib (13) of the mobile crane (11) at a predefined height so that the first net (15) is placed between the ground (T) and items able to fall from a position located above the mobile crane (11).
EP15154545.6A 2015-02-10 2015-02-10 Optimised system for protecting a piece of work Active EP3056465B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15154545.6A EP3056465B1 (en) 2015-02-10 2015-02-10 Optimised system for protecting a piece of work

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15154545.6A EP3056465B1 (en) 2015-02-10 2015-02-10 Optimised system for protecting a piece of work

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EP3056465A1 EP3056465A1 (en) 2016-08-17
EP3056465B1 true EP3056465B1 (en) 2019-01-02

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3053322B1 (en) * 2016-06-30 2020-12-04 Manitowoc Crane Group France SUPPORT INSTALLATION AND METHOD INCLUDING A TOWER CRANE FOR SUPPORTING A HIGH TENSION LINE ELECTRIC CABLE
CN107055345B (en) * 2017-02-13 2018-06-05 周庆川 Diao Sheng mechanisms

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2778193B1 (en) * 1998-05-04 2000-09-08 Mediaco PROTECTIVE TRANSPORT GATEWAYS DEVICE MOUNTED ON A LIFTING APPARATUS
CN203813323U (en) * 2014-04-29 2014-09-03 国家电网公司 Folding bracing frame for power transmission line crossing rack

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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