FR2812464A1 - Curved section for lattice type cableway, comprises longitudinal lines which freely pass through rings on one side and at the bottom of transverse U shaped lines and are welded solid to other side. - Google Patents

Abstract

The curved section of cableway has longitudinal lines (5,6,7,8,10,11) and U shaped transverse lines (9) which are located at intervals. The longer outer longitudinal lines (5,6,10,11) run freely through loops (17) in one side (3) and at the base (2) of the transverse lines while the shorter inner longitudinal lines (7,8) are welded solidly to the other side (4) which is bevelled (16) inwards Independent claims are made for methods used in construction of the curved section

Description

CURVED SECTION OF PATH WITH WIRE MESH CABLES,

  PROCESS FOR PRODUCING CABLES

INCLUDING SUCH A SECTION

  The invention relates to the technical field of cable support systems, in particular electrical cables and / or telecommunications cables.

or equivalent.

  Four main types of cable supports are known in the prior art: cable ladders, wire mesh cable trays, cable trays

  o10 in perforated sheets and chutes.

  The invention relates more particularly to cable trays in

wire mesh.

  These wire mesh cable trays are conventionally produced by assembling: - longitudinal wires, commonly called warp wires, running longitudinally, typically straight or almost straight over their entire length; - cross threads, commonly known as weft threads, established

  transversely, from place to place, along these warp threads.

  Warp and weft threads are most often made of alloy

  metal and their assembly is conventionally carried out by welding.

  The weft threads are typically U-shaped, so that the trellis cable tray comprises a bottom panel and two side panels,

commonly known as wings.

  By "wires" is meant here both solid sections of substantially oval or circular cross section, as well as sections of square or rectangular cross section or open sections of C or

U, for example.

  The weft threads may in particular be in the form of strips

  narrow, of rectangular cross section.

  Such wire mesh cable trays are commonly used to provide support, housing and protection of electrical cables,

  telecommunications cables or fibers or the like.

  Examples of such cable trays can be found in the following documents: - French patent applications published under the numbers 2 376 539, 2 576

  158, 2,599,906, 2,613,146, 2,617,341, 2,628,904, 2,634,600, 2,645,359, 2,652

  206, 2,652,142, 2,669,708, 2,686,393, 2,687 207, 2,691,590, 2,697,313, 2,697

  690, 2,698,416, 2,706,973, 2,716,242, 2,716,768, 2,723,270, 2,725,772, 2,725

  0 846, 2 727 186, 2 728 649, 2 734 503, 2 737 355, 2 750 754, 2 766 897; - European patent applications published under the numbers 0191667,

  0229544, 0275185, 0298825, 0352191, 0355081, 0390668, 0399790, 0418167,

  0553039, 0556137, 0571307, 0617493, 0718944, 0818862, 0905843;

  - international patent applications published under the numbers is 96 / 08063.99 / 06746;

  - German patent applications published under the numbers DE-A-

2036325, DE-A-4037412, DE-4336168.

  To prevent the end parts of the weft threads from injuring the cables, especially when these cables are laid, a large number

  solutions have been envisaged in the prior art.

  Thus, for example: - in document FR-2 697 313, it is proposed that the ends of the weft threads are rounded and have a smooth surface to facilitate the sliding of the electric cables over them during their handling; - Document DE-4336168 proposes the machining of the ends of the transverse wires; - In documents FR-A2 617 341 and EP-A-0 298 825, it is proposed that edge wires constitute the upper edges of the vertical wings of a cable tray, these edge wires being welded in such a position that at the welding point, the axes of the edge wires and the axes of the weft wires are substantially in the same plane; - In documents FR-A-2 634 600 and EP-A-0 352 191, it is proposed that longitudinal strands of strands are welded in the vicinity of the ends of the weft threads, this welding being carried out on the side opposite that of the welding on the weft threads of the other warp threads of the wings of the cable tray, the longitudinal edge threads being, moreover, folded in the vicinity of the transverse threads of

so bypass them.

  Cable networks must routinely follow a network with changes in direction. To obtain these changes of direction, installers conventionally make numerous cuts in the wires, then assemble the cut parts using clips, bolts, or clips. An example of such cuts and assemblies can be found in the document

DE-A-2930083 (Figure 11).

  Besides that the cutting and assembly operations are long and tedious, the wings of the section of cable tray obtained by this conventional prior i5 technique most often have protruding parts which can cause injuries to the sheaths of the cables or the hands of the operators. . The invention aims to provide a new structure of cable trays in wire mesh allowing the production of curved sections for changes of direction of the cable way, these curved sections being obtained: - without the wings of the cable way having protruding parts and / or - without the operator having to make numerous wire cuts. To this end, the invention relates, according to a first object, to a section of wire mesh cable tray, comprising two substantially parallel warp threads and at least two weft threads arranged transversely, from place to place, the along the warp threads, one of the two warp threads, said first warp thread, being rigidly assembled with the weft threads and being of a length less than that of the other warp thread, said second warp thread , sliding mounted

on the weft threads.

  Said section of cable tray can be of U, V, pseudo U, pseudo V, Z, pseudo Z cross section. According to one type of embodiment, this section is such that the weft yarns are provided with '' a base section and two side sections, the assembly of warp and weft threads defining for the section a bottom wall and

two side wings.

  In a first series of embodiments, the second warp thread is slidably mounted on a first wing of the weft threads, the first warp thread being

  rigidly assembled to the bottom wall of the weft threads.

  io The section then has, according to various embodiments, the following characters, possibly combined: - at least one third warp thread, substantially parallel to the first two warp threads, is slidably mounted on the second lateral wing of the section; - At least one other warp thread is rigidly associated with the bottom wall of the weft threads; - At least one of its two lateral wings comprises at least one other warp thread, mounted to slide on said wing; - at least one of the warp threads is arranged on the external face of the

frame.

  In a second series of embodiments, the second warp thread is slidably mounted on the bottom wall of the weft threads, the first warp thread being

  rigidly associated with a first wing of the weft threads.

  The section then has, according to various embodiments, the following characters, possibly combined: - a third warp thread, substantially parallel to the first two warp threads, is slidably mounted on the second wing of the weft threads; - At least one other warp thread is rigidly mounted on the first wing of the weft threads; at least one other warp thread is slidably mounted on the second wing or on the bottom wall of the weft threads; - At least one of the warp threads is arranged on the outer face of the weft threads. The sliding assembly of the warp threads on the weft threads can be obtained by the following means or their equivalents: - at least one warp thread mounted sliding on the weft threads is attached to said weft threads by snap-fastening or threading; this sliding chain wire can be an edge wire; - the weft threads are provided with loops in which the warp threads slidably mounted on the weft threads can slide, the loops extending 0o substantially in the plane of extension of the weft threads or forming helices

  coming to surround the sliding mounted warp threads.

  The warp threads and the weft threads are made of an identical or different material, in particular chosen from the group comprising metal alloys and polymeric materials. The choice of materials will be established, as will be understood by a person skilled in the art, taking into account in particular the static forces to be supported by the cable tray, the number and the section of the warp threads and the mechanical forces necessary for bending. sections

cable trays.

  The invention relates, according to a second aspect, to a method of producing a cable tray comprising at least one section as presented above, this method comprising a step of folding said section. This method further comprises, in one embodiment, a step of cutting the sliding warp threads, for their projecting section after folding, beyond the extreme weft threads of said curved section. In a particular embodiment, this cutout creates a stop blocking the sliding assembly of the warp threads. In one embodiment, the method comprises a step of assembling between the part of the sliding wires projecting from said curved section and a part of the warp or weft son of the sections abutting said curved section, this projecting part sliding wires thus acting as a splint

  between the contiguous sections of the cable tray.

  Other objects and advantages of the invention will become apparent during the course of the

  following description of embodiments, description which will be made in

  Referring to the accompanying drawings, in which: - Figure 1 is a schematic cross-sectional view of a section of cable tray according to a first embodiment of the invention; - Figure 2 is a schematic cross-sectional view of a section of cable tray according to a second embodiment of the invention; - Figure 3 is a schematic top view of a section of cable tray corresponding to Figure 1, this section comprising a bottom panel io plane and two side wings curved according to a substantially constant radius of curvature, this curvature defining a right or left turn according to the direction of travel chosen on the cable tray, the weft son of the free edges of the section being arranged in two substantially perpendicular planes; FIG. 4 is a diagrammatic side view of a section of cable path corresponding to FIG. 2, this section comprising a bottom panel and two lateral wings, the bottom panel being curved along a substantially constant radius of curvature, the weft yarns of the free edges of the section being arranged in two substantially perpendicular planes, this curved section thus allowing passage between a horizontal section and a vertical section of cable tray; - Figure 5 is a view along arrow V of Figure 4; Figures 6 to 8 schematically illustrate three embodiments of the connecting means between warp son and weft son on the free edges of the cable tray sections according to the invention; - Figure 9 illustrates, in cross section of a section of cable tray, an alternative embodiment of the connecting means between warp son and weft son; - Figure 10 is a partial perspective view of a section of cable tray in which the warp son and weft son are connected by means as shown in Figure 9; - Figure 11 is a detail view of an end portion of warp wire, for an embodiment of section of cable tray said flattened cut or crushed cut; - Figure 12 is a view of an end portion of cable tray according to Figure 3 or 4, wherein the warp son are provided with end portions as shown in Figure 11, these end parts being seen in Figure 12 after flattening or crushing; - Figure 14 is a view of a section of cable tray according to the invention, two types of profiles being partially shown in this figure 14, each o10 of these two types of profiles being covered, after shaping, with a rod hanger; - Figure 15 is a cross-sectional view of the first type of profile shown in Figure 14; - Figure 16 is a cross-sectional view of the second type of profile shown in Figure 14; - Figures 17,18 and 19 are views corresponding respectively to

  Figures 14,15 and 16 after fitting the curved profiles.

  We first refer to Figures 1 and 3 which illustrate a first mode

  for producing a section of profile according to the invention.

  This section of profile 1, obtained by assembling warp threads and threads

  frame, includes a bottom panel 2 and two side wings 3,4.

  In the embodiment shown in Figures 1 and 3, the two side wings 3,4 are substantially parallel, of the same height, and extend substantially perpendicular to the bottom wall 2. It is understood, however, as will be understood l 'skilled person, that the two wings may be of different heights, that they may not be parallel to each other and / or do not both extend substantially perpendicular to the bottom panel. In the embodiment shown in Figures 1 and 3, each of the two side wings 3,4 is associated with two warp threads 5,6,7,8. It is understood, however, that one of the two wings can be associated with a different number of warp threads than that associated with the other side wing, in particular when the

  two wings are of different heights.

  In the embodiment shown in FIGS. 1 and 3, each of the two wings is associated with a first warp thread 5,7 located near the top edge of the weft threads 9, each of the two wings being associated with another warp thread. chain 6.8 disposed substantially at mid-height of these wings 3.4. It is understood, however, that the warp threads associated with a first wing could be disposed at a height different from that of the warp threads associated with the other lateral wing. The bottom panel can be formed by the assembly of weft threads 9 and one, two or more of two warp threads, only two of these warp threads 10,11

  being shown in Figures 1 and 3.

  The warp threads 5, 6 of the first lateral wing 3 are slidably mounted on the lateral sections 12 of the weft threads included in this first lateral wing 3. The warp threads 10, 11 of the bottom panel 2 are also slidably mounted by compared to the basic section 13 of the weft threads 9 included in

i5 this bottom panel 2.

  The warp threads 7, 8 of the second side wing 4 are rigidly assembled on the side sections 14 of the weft threads included in this second side wing 4. In order to avoid injuries of the cables by friction on the end portions free 15 of the lateral sections 14 of the weft threads included in the second lateral wing 4, these free end portions 15 define a bevel 16 extending below the warp thread 7 forming the edge thread. In an alternative embodiment, not shown, the end portions 15 of the lateral sections 14 are bent into a crosspiece along the extension plane P of the

side sections 14.

  The rigid assembly of the warp threads 7,8 on the lateral sections of the weft threads 9, on the second lateral wing 4, can be obtained by any means suitable for the materials used to make these warp threads and weft threads. So, for example, when the warp threads 7,8 and the weft threads are made of an alloy

  metal or polymeric material, assembly can be obtained by welding.

  In the embodiment of FIGS. 1 and 3, the sliding assembly of the warp threads associated with the first side wing 3 and with the bottom panel 2 is obtained by loops 17 arranged on the external face of the weft thread 9. It is it is understood that at least one of the loops may extend, as a variant, on the internal face of the weft threads 9. More generally, the section of cable tray could be formed by the assembly of warp threads arranged on the inner face of the weft threads. In another embodiment, the weft threads carry internal loops and external loops, so that the threads of

  warp can be arranged on the external face and on the internal face of the weft threads.

  FIG. 3 is a schematic top view of a section of cable tray corresponding to FIG. 1, this section comprising a flat bottom panel 2 and two lateral wings 3, 4 curved according to a substantially constant radius of curvature o10, this curvature defining a right or left turn according to the direction of travel chosen on the cable tray, the weft threads 9a, 9b of the free edges of the section 1 being arranged in two planes P1, P2

substantially perpendicular.

  It is understood, however, that this curvature is only one of those achievable. Thus, for example, the free edges of the section could be arranged in two non-perpendicular planes. The radius of curvature of the section could be variable, depending on the needs on the cable tray installation site. Section 1 can be folded manually or using

  tools, on site, according to the user's needs.

  The sliding warp threads are provided with an over-length 18. This over-length is of dimension adapted to allow a range of curvature given to the section. Each excess length is protected, at its end, by a plug, a loop or a cable clamp, so as to limit the risk of injury when handling or folding the cable sections. These protective means form, where appropriate, a stop against the extreme weft yarns,

  so as to prohibit the folding of the section beyond a predetermined threshold value.

  These protective means limit the sliding of the warp threads

  sliding in the loops 17, in particular during the transport of the sections 1.

  The sliding warp threads can be made of an identical or different material from that of the weft threads. Thus, for example, the sliding warp threads and the weft threads can be made of polymer material or

metal alloy.

  We now refer to Figures 2 and 4 which illustrate a second

  embodiment of the invention.

  The section of profile 1, obtained by assembling warp threads and threads

  frame, includes a bottom panel 2 and two side wings 3,4.

  In the embodiment shown in FIGS. 2 and 4, the two lateral wings 3, 4 are substantially parallel, of the same height, and extend substantially perpendicular to the bottom wall 2. It is understood, however, as will be understood l 'skilled person, that the two wings may be of different heights, that they may not be parallel to each other and / or do not both extend substantially perpendicular to the bottom panel. In the embodiment shown in Figures 2 and 4, each of the two side wings 3,4 is associated with two warp son 5,6,7,8. It is understood, however, that one of the two wings can be associated with a different number of warp threads than that associated with the other side wing, in particular when the

  two wings are of different heights.

  In the embodiment shown in Figures 2 and 4, each of the two wings is associated with a first warp thread 5,7 located near the top edge of the weft threads 9, each of the two wings being associated with another thread chain 6.8 disposed substantially at mid-height of these wings 3.4. It is understood, however, that the warp threads associated with a first wing could be disposed at a

  height different from that of the warp threads associated with the other side wing.

  The bottom panel can be formed by the assembly of weft threads 9 and one, two or more of two warp threads, only two of these warp threads 10,11

  being shown in Figures 1 and 3.

  The warp threads 5, 6 of the first lateral wing 3 are slidably mounted on the lateral sections 12 of the weft threads included in this first lateral wing 3. The warp threads 10, 11 of the bottom panel 2 are rigidly assembled to the base section 13 of the weft threads 9 included in this panel

background 2.

  Il The warp threads 7,8 of the second lateral wing 4 are in turn sliding mounted on the lateral sections 14 of the weft threads included in

this second side wing 4.

  The rigid assembly of the warp threads 10,11 on the base sections 13 of the weft threads 9, on the base panel 2, can be obtained by any means

  suitable for the materials used to make these warp and weft threads.

  Thus, for example, when the warp threads 10,11 and the weft threads are made of metal alloy or of polymer material, the assembly can be obtained by welding. In the embodiment of FIGS. 2 and 4, the sliding assembly of the warp threads associated with the two lateral wings 3, 4 is obtained by loops 17 arranged on the external face of the weft thread 9, loops through which the threads pass 5,6,7,8 chain. It is understood that at least one of the loops may extend, as a variant, on the internal face of the weft threads 9. More generally, the section of cable tray could be formed by the assembly of threads warp arranged on the inner face of the weft threads. In another embodiment, the weft threads carry internal loops and external loops, so that the warp threads can be arranged on the external face and

on the inner face of the weft threads.

  Figure 4 is a schematic side view of a section of cable tray corresponding to Figure 2, this section comprising a bottom panel 2 and two side wings 3,4 curved along a substantially constant radius of curvature, the weft son free edges of the section being arranged in two planes Q1, Q2 substantially perpendicular, this curved section thus allowing passage between a horizontal section and a vertical section of cable tray. It is understood, however, that this curvature is only one of those achievable. Thus, for example, the free edges of the section could be arranged in two non-perpendicular planes. The radius of curvature of the section could be variable, depending on the needs on the cable tray installation site. The section 1 can be folded manually or using a tool such as a bending jig, on site, depending on the

user needs.

  The sliding warp threads are provided with an over-length 18. This over-length is of dimension adapted to allow a range of curvature given to the section. Each excess length is protected, at its end, by a plug, a loop or a cable clamp, so as to limit the risk of injury when handling or folding the cable sections. These protective means form, where appropriate, a stop against the extreme weft yarns,

  so as to prohibit the folding of the section beyond a predetermined threshold value.

  o0 The protective means limit the sliding of the warp threads

  sliding in the loops 17, in particular during the transport of the section 1.

  The sliding warp threads can be made of an identical or different material from that of the weft threads. Thus, for example the sliding warp threads and the weft threads can be made of polymer material or

metal alloy.

  Referring now to Figures 6 to 10 which illustrate different embodiments of the sliding connection means between warp son and weft son. In the embodiments of FIGS. 6 and 7, the weft threads are folded around the warp threads of the wings of the section. In other words, starting from the base section 13 of the weft threads and going towards the upper edge of these, there is: - a first section 20, internal (FIG. 6) or external (FIG. 7) warp yarn; - A first loop 21 helically enclosing a first sliding warp wire 6; - A second section 22 internal (Figure 6) or external (Figure 7) relative to the warp son; a second loop 23 helically enclosing a second warp wire

forming edge wire.

  In the embodiment of FIG. 8, the weft threads are folded around the warp threads of the side wings 3, 4 and of the bottom panel 2 of the

section of cable tray.

  The embodiment of Figure 9 is similar to that described with reference to Figure 1, with the following difference: the bottom panel 2 of the section is provided with a warp wire 30, integral with the bottom panel. This embodiment allows folding of the section in the plane (in a manner analogous to what has been described with reference to FIG. 3) but also out of plane (in a manner analogous to what has been described with reference to FIG. 4) . The folding can be done manually or using a tool such as a bending jig, by

example.

  The sliding assembly of the warp threads on the weft threads can be obtained by other means than those described above, for example by open C-shaped rings arranged on the external face and / or the internal face i5 of the warp threads. frame, stirrups, cable ties or grooves in

the thickness of the weft threads.

  Referring now to Figures 11 and 12. As shown in these figures, the sliding warp son can be provided, at their free end, with a flattened or flattened cutout. This cut 40, of tapered shape, if necessary protected by a removable protective plug, allows after its flattening to form an extra thickness 41 forming a stop

  against the extreme weft thread of the curved section, as it appears in FIG. 12.

  The establishment of a section as described above with reference to FIGS. 1 to 12 comprises the following steps: - carrying out, manually or using a tool, the desired bending for the section, according to the needs observed On the worksite; - possible cutting of the projecting parts of the sliding warp threads and holding in position of these sliding warp threads by crushing cut of

  fold back with a suitable tool or use of stirrups or clamps.

  We now refer to Figures 14 and following.

  The sections of cable tray shown in these figures include weft son 9 connected by warp son, the assembly of the curved section of cable tray to the other sections to which it abuts being ensured, at least in part, through of curved profiles 50 of section in C or in U, these

  curved sections forming warp wire for section 1.

  These profiles can be made of substantially rigid metallic material, their plastic bending deformation being obtained by manual action or

using a tool.

  As a variant, these curved profiles may be made of polymer material, for example

  example of the type used for flexible or semi-flexible joints.

  As shown in FIGS. 14, 16, 17 and 19, the curved section can io include weft threads 9, in a U, the curved bottom panel 2 of this section being formed by rigid assembly with warp threads 10, 11, curved sections 50 being put in place, by force, on the rounded end portions 51 of the weft threads. These sections 50 also extend, by force-fitting, over

  at least part of an edge wire 5 of a section 52 abutted to the curved section 1.

  These sections 50 ensure good protection of the cables against injuries

  on the extreme parts of the weft threads.

  As a variant, as it appears in FIGS. 14, 15, 17 and 18, the curved section may comprise weft threads 9 in a U, the curved bottom panel 2 and the wings 3, 4 of this section being formed by assembly rigid with warp threads, at least one curved section 50a, 50b being forced into place on the warp threads of the wings of the section. These sections 50a, 50b also extend, by force-fitting, over at least part of the edge wires 5, 6 of a section 52

abutting the curved section 1.

  The end parts of the weft threads being covered by the profile 50,

  the risk of injury to the cables on the weft wires is eliminated.

  The structures of wire mesh cable trays which have just been described allow the production of curved sections for the changes of direction of the cable tray, these curved sections being obtained without the wings of the cable tray having protruding parts, and without the operator

  do not have to cut many wires.

  As it appears in FIGS. 3, 4, 12, 14 and 17, the sections of cable trays which have just been described have, in the curved state, lateral wings with continuous warp threads, without cutting. Safety, when laying cables, is thus reinforced, the risk of cable injuries and the risk of injury to the operator's hands being

thus reduced.

Claims (22)

  1. Section of cable tray in wire mesh, comprising two substantially parallel warp threads (5,6,7,8,10,11) and at least two weft threads (9) arranged transversely, from place to place, along the warp threads (5,6,7,8,10,11), characterized in that one of the two warp threads, said first warp thread, is rigidly assembled with the weft threads and is of a length shorter than that of the other warp thread, called second warp thread, mounted sliding on the weft threads.   2. section of cable tray according to claim 1, characterized in that the weft son (9) are provided with a base section (13) and two side sections (12,14), the assembly of the son warp and weft threads   defining for the section (1) a bottom wall and two lateral wings.   3. section of cable tray according to claim 2, characterized in that the second warp thread (5) is slidably mounted on a first wing (12) of the weft threads (9), the first warp thread (10) being rigidly assembled to the wall weft (13) of the weft threads (9).   4. section of cable tray according to claim 3 characterized in that it comprises at least a third warp wire (7), substantially parallel to the first two warp son (5,10), and slidably mounted on the second wing side (14) of the section (1).   5. section of cable tray according to claim 4, characterized in that it comprises at least one other warp wire (11), rigidly associated with the wall weft (13) of the weft threads (9).   6. section of cable tray according to claim 4 or 5, characterized in that at least one of its two lateral wings (12,14) comprises at least one   another warp wire (6,8), slidably mounted on said wing.   7. section of cable tray according to any one of claims 3   to 7, characterized in that at least one of the warp threads is placed opposite weft threads.   8. section of cable tray according to claim 2, characterized in that the second warp wire (10) is slidably mounted on the bottom wall (13) of the weft son (9), the first warp wire (7 ) being rigidly associated with a   first wing (14) of the weft threads (9).   9. section of cable tray according to claim 8, characterized in that it comprises a third warp wire (5), substantially parallel to the first two warp son (7,10) and slidably mounted on the second wing (12 ) sons weft (9).   10. section of cable tray according to claim 9, characterized in that it comprises at least one other warp wire (8) rigidly mounted on the   first wing (14) of the weft threads (9).   11. section of cable tray according to claim 9 or 10, characterized in that it comprises at least one other warp wire (6) mounted to slide on the   second wing (12) or on the bottom wall (13) of the weft threads (9).   12. Cable tray section according to any one of claims   8 to 11, characterized in that at least one of the warp threads is placed opposite weft threads.   13. Section of cable tray according to any one of   Claims 1 to 12, characterized in that at least one warp thread mounted   sliding on the weft threads is attached to said weft threads by   snap-on, threading or any other equivalent means.   14. section of cable tray according to claim 13, characterized in that it comprises at least one edge wire (50) slidably mounted on the son of   weft (9), this edge wire (50) being snap-fitted on the weft son.   15. Section of cable tray according to any one of claims   1 to 14, characterized in that the weft threads are provided with loops (17,21,23) in which the warp threads slidably mounted on the threads can slide weft (9).   16. section of cable tray according to claim 15, characterized in that the loops (17) extend substantially in the plane of extension of the wires weft (9).   17. section of cable way according to claim 15, characterized in that the loops (21,23) form helices coming to surround the warp son sliding mounted.   18. Section of cable tray according to any one of   previous claims, characterized in that the warp threads and the   weft are made of a material chosen from the group comprising alloys   metallic and polymeric materials.   s 19. Method for producing a cable tray comprising at least one   section as presented in any one of claims 2 to 18,   characterized in that it comprises a step of folding said section (1).   20. The method of claim 19, characterized in that it comprises a step of cutting the sliding warp son, for their projecting section   lo after folding (18), beyond the extreme weft son of said curved section.   21. The method of claim 20, characterized in that this   cutting creates a stop blocking the sliding assembly.   22. Method according to claim 19, characterized in that it comprises a step of assembly between the part of the sliding wires projecting from said curved section and a part of the warp or weft son of the sections abutted to said curved section. , this projecting part of the sliding wires doing so   joint splice office between the contiguous sections of the cable tray.