EP0004518A1 - Metallic thermal insulator especially for nuclear installations - Google Patents

Metallic thermal insulator especially for nuclear installations Download PDF

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Publication number
EP0004518A1
EP0004518A1 EP79400201A EP79400201A EP0004518A1 EP 0004518 A1 EP0004518 A1 EP 0004518A1 EP 79400201 A EP79400201 A EP 79400201A EP 79400201 A EP79400201 A EP 79400201A EP 0004518 A1 EP0004518 A1 EP 0004518A1
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EP
European Patent Office
Prior art keywords
strips
straps
double
sides
cells
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP79400201A
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German (de)
French (fr)
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EP0004518B1 (en
Inventor
René Chevallier
André Roux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neyrpic Framatome Mecanique
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Neyrpic SA
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Application filed by Neyrpic SA filed Critical Neyrpic SA
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
    • E04C2/36—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/42—Gratings; Grid-like panels
    • E04C2/427—Expanded metal or other monolithic gratings

Definitions

  • the present invention relates to a new material consisting of a honeycombed metal panel which can be advantageously used for the manufacture of heat insulators.
  • Such heat insulators are of a complex and expensive assembly because this assembly must be extremely precise, and on the other hand they pose problems of resistance to the stresses of expansion because, the stamped sheets being in one piece, they come in dilation, force on their supports. Furthermore, the resistance of this type of material in the thickness direction is not always sufficient.
  • the present invention therefore relates to a new material constituted by a structure appearing as a honeycombed metal panel, of simple manufacture, having a high resistance in the thickness direction and a low resistance in the longitudinal and transverse directions.
  • a material can, for example, be advantageously used as a metal heat-insulating element, intended for example to be inserted between two flat sheets, without having the drawbacks of the materials known hitherto.
  • the honeycombed metal panel according to the invention is characterized in that it consists of a stretching of expanded metal cut beforehand so as to result, after additional stretching operation, in a struc honeycomb structure with substantially square or rectangular cells, of flat surface, of strips all perpendicular to said flat surface, each of said cells having a first pair of sides facing each other, each composed of a double strip of the same width , and a second pair of sides facing each other and made up of two strips, placed end to end and "in tiles", the sum of the widths of these two strips being moreover equal to the common thickness of the double strips constituting the other two sides.
  • FIG. 1 shows a panel according to the invention, placed on a thin metal sheet 1 of stainless steel.
  • FIG. 2 shows, on the other hand, the panel of the invention, placed between two metal sheets 1, which makes it possible to understand how it is possible, by alternating stacking of panels of the invention and of full sheets, metallic insulation which will be finished, as well for its upper layer as for its lower layer, by a framework constituted, as known per se, by two fairly thick full sheets.
  • the view in direction B represented in FIG. 3 makes it possible to realize that the double strips 2, because of their arrangement, form a perfect convection barrier when the structure of the invention is used in an insulation as a spacer between two metal sheets 1.
  • the top view of FIG. 4 shows that the cells constituting the structure have an approximately square shape, the absolutely perfect square being practically difficult to obtain because of the rounding and, moreover, not being strictly necessary for the realization of the structure of the invention.
  • the square shape is preferable for the cells, these could also have a rectangular shape.
  • the structure of the invention is of great interest by its ease of implementation. It is in fact produced by stretching expanded metal previously cut and repelled by the guillotine, the cutting lengths of the latter being adjusted appropriately to obtain, after stretching, the structure of the desired invention: in the example shown on the figures for example, it can be seen that the cutting length is twice the uncut length.
  • the thickness of the structure is adjustable at will according to the desired use.
  • it could be from 5 to 7 mm.
  • the structure of the invention has a high mechanical strength in thickness, which can be important for example for the insulation of pipes on which one is likely to walk, or for various industrial achievements, for example the manufacture of mats.
  • its mechanical resistance in the transverse and longitudinal directions is low, so that the material can expand freely without creating stresses on the fixing studs.
  • the structure of the invention is more economical than a usual structure of expanded metal because, due to the additional drawing operation, the density of metal per square meter is lower.
  • the structure of the invention is capable of being used in all kinds of industries, it finds a particularly interesting application for the production of heat insulators.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)

Abstract

1. A metallic heat-insulation formed of a stack of alternate metal sheets (1) and cellular panels, characterized in that each of the said cellular panels is produced in a manner in itself known, by after-stretching of expanded metal after it has previously been cut out and embossed, so as to finish up with a plane structure having substantially square or rectangular cells, bounded in thickness by the two planes formed by the sheets (1) and formed of straps (2, 4 to 6) all perpendicular to these two planes, each of the cells including a first pair of sides facing one another and composed each of a double strap (2) of the same width for each of them and a second pair of sides (3) facing one another and formed each of two straps (4, 5) placed end to end and "like tiles" (Figure 2), the sum of the widths of these two straps being furthermore equal to the width of the double straps (2) forming the first two sides, the said metallic cellular panel being placed in such a way that the double straps (2) are at right angles to the direction of convection (B).

Description

La présente invention concerne un nouveau matériau constitué par un panneau métallique alvéolé pouvant être avantageusement utilisé pour la fabrication de calorifuges.The present invention relates to a new material consisting of a honeycombed metal panel which can be advantageously used for the manufacture of heat insulators.

Il existe de nombreux cas, comme c'est le cas par exemple dans l'industrie nucléaire, où un calorifuge doit impérativement avoir une résistance de très longue durée, pouvant aller jusqu'à plusieurs dizaines d'années. Les calorifuges connus actuellement et permettant de résoudre au mieux ce problème de tenue dans le temps sont des calorifuges métalliques constitués soit par un empilage alterné de tôles planes et de tôles ondulées, cloquées ou embouties, soit par un empilage de tôles embouties placées de manière appropriée, tel que décrit, par exemple, dans le brevet britannique n° 1.010.943.There are many cases, as is the case for example in the nuclear industry, where an insulation must imperatively have a resistance of very long duration, being able to go up to several tens of years. The currently known heat insulators which make it possible to best resolve this problem of resistance over time are metal heat insulators constituted either by an alternating stack of flat sheets and corrugated sheets, blistered or stamped, or by a stack of suitably placed stamped sheets. , as described, for example, in British Patent No. 1,010,943.

De tels calorifuges sont d'un montage complexe et onéreux car ce montage doit être extrêmement précis, et d'autre part ils posent des problèmes de résistance aux contraintes de dilatation car, les tôles embouties étant d'un seul tenant, elles viennent, en dilatation, forcer sur leurs supports. Par ailleurs, la résistance de ce type de matériau dans le sens de l'épaisseur n'est pas toujours suffisante.Such heat insulators are of a complex and expensive assembly because this assembly must be extremely precise, and on the other hand they pose problems of resistance to the stresses of expansion because, the stamped sheets being in one piece, they come in dilation, force on their supports. Furthermore, the resistance of this type of material in the thickness direction is not always sufficient.

La présente invention se rapporte donc à un nouveau matériau constitué par une structure se présentant comme un panneau métallique alvéolé, de fabrication simple, présentant une forte résistance dans le sens de l'épaisseur et une faible résistance dans les sens longitudinal et transversal. Un tel matériau peut, par exemple, être avantageusement utilisé comme élément de calorifuge métallique, destiné par exemple à être inséré entre deux feuilles planes, sans présenter les inconvénients des matériaux connus jusqu'alors.The present invention therefore relates to a new material constituted by a structure appearing as a honeycombed metal panel, of simple manufacture, having a high resistance in the thickness direction and a low resistance in the longitudinal and transverse directions. Such a material can, for example, be advantageously used as a metal heat-insulating element, intended for example to be inserted between two flat sheets, without having the drawbacks of the materials known hitherto.

Le panneau métallique alvéolé selon l'invention est caractérisé en ce qu'il est constitué par un étirage de métal déployé préalablement coupé de manière à aboutir, après opération complémentaire d'étirage, à une structure en nid d'abeilles à alvéoles substantiellement carrées ou rectangulaires, de surface plane, de lanières toutes perpendiculaires à ladite surface plane, chacune desdites alvéoles comportant une première paire de côtés se faisant face, chacun composé d'une double-lanière de même largeur, et une seconde paire de côtés se faisant face et constitués chacun de deux laniè- , res mises bout à bout et "en tuiles", la somme des largeurs de ces deux lanières étant par ailleurs égale à l'épaisseur commune des double-lanières constituant les deux autres côtés.The honeycombed metal panel according to the invention is characterized in that it consists of a stretching of expanded metal cut beforehand so as to result, after additional stretching operation, in a struc honeycomb structure with substantially square or rectangular cells, of flat surface, of strips all perpendicular to said flat surface, each of said cells having a first pair of sides facing each other, each composed of a double strip of the same width , and a second pair of sides facing each other and made up of two strips, placed end to end and "in tiles", the sum of the widths of these two strips being moreover equal to the common thickness of the double strips constituting the other two sides.

L'invention sera mieux comprise à l'aide de la description suivante d'un exemple préférentiel de réalisation, en référence aux dessins annexés dans lesquels :

  • - la figure 1 est une vue en perspective d'un panneau selon l'invention, utilisé comme élément de calorifuge, et représenté placé sur une feuille pleine
  • - la figure 2 est une coupe suivant la direction AA' de la figure 1, le panneau de l'invention étant alors figuré placé entre deux feuilles pleines
  • - la figure 3 est une vue suivant la direction B de la figure 1
  • - la figure 4 est une vue de dessus de l'élément de calorifuge de la figure 1.
The invention will be better understood using the following description of a preferred embodiment, with reference to the accompanying drawings in which:
  • - Figure 1 is a perspective view of a panel according to the invention, used as an insulating element, and shown placed on a solid sheet
  • - Figure 2 is a section along the direction AA 'of Figure 1, the panel of the invention then being shown placed between two solid sheets
  • - Figure 3 is a view in direction B of Figure 1
  • - Figure 4 is a top view of the insulation element of Figure 1.

La vue perspective de la figure 1 montre un panneau conforme à l'invention, placé sur une feuille métallique mince 1 en acier inoxydable. La vue en coupede la figure 2 montre par contre le panneau de l'invention, placé entre deux feuilles métalliques 1, ce qui permet de concevoir comment on peut réaliser, par un empilage alterné de panneaux de l'invention et de feuilles pleines, un calorifuge métallique qui sera terminé, aussi bien pour sa couche supérieure que pour sa couche inférieure, par une ossature constituée, tel que connu en soi, par deux tôles pleines assez épaisses.The perspective view of Figure 1 shows a panel according to the invention, placed on a thin metal sheet 1 of stainless steel. The sectional view of FIG. 2 shows, on the other hand, the panel of the invention, placed between two metal sheets 1, which makes it possible to understand how it is possible, by alternating stacking of panels of the invention and of full sheets, metallic insulation which will be finished, as well for its upper layer as for its lower layer, by a framework constituted, as known per se, by two fairly thick full sheets.

Le panneau de l'invention, dont on peut distinguer sans ambiguité sur la figure 1 la structure particulière, se présente comme une structure plane en nid d'abeilles à alvéoles, carrées dans l'exemple représenté, chacune de ces alvéoles comportant : premiers

  • - deux/côtés 2 situés face à face et constitués chacun par une double-lanière orthogonale à la surface plane de la structure, c'est à dire à la surface de la feuille 1 sur laquelle elle est posée
  • - deux autres côtés 3 situés face à face dans chaque carré et constitués chacun, comme on le voit sur les figures, par deux lanières 4 et 5, chacune de largeur et de longueur moitié des doubles-lanières 1, mises bout à bout et "en tuiles", c'est à dire, comme représenté, de manière à ce que chacune des extrémités desdites lanières, 4 par exemple, soit placée respectivement au-dessus de celle de la lanière, 6 par exemple, qui la précède et au-dessous de celle de la lanière, 5 par exemple, qui lui fait suite. Par ailleurs, chacune des lanières 4, 5, 6, etc ..., est aussi orthogonale à la surface plane de la structure, c'est à dire également à la feuille 1.
The panel of the invention, the particular structure of which can be distinguished without ambiguity in FIG. 1, is presented as a planar honeycomb structure with cells, square in the example shown, each of these cells comprising: first
  • - two / sides 2 located face to face and each constituted by a double strap orthogonal to the flat surface of the structure, that is to say to the surface of the sheet 1 on which it is placed
  • - two other sides 3 located face to face in each square and each constituted, as seen in the figures, by two strips 4 and 5, each of width and half the length of the double strips 1, placed end to end and " in tiles ", that is to say, as shown, so that each of the ends of said strips, 4 for example, is placed respectively above that of the strap, 6 for example, which precedes it and below that of the strap, 5 for example, which follows it. Furthermore, each of the strips 4, 5, 6, etc., is also orthogonal to the planar surface of the structure, that is to say also to the sheet 1.

La vue suivant la direction B que représente la figure 3 permet de se rendre compte que les double-lanières 2, du fait de leur disposition, forment une barrière de convection parfaite lorsque la structure de l'invention est utilisée dans un calorifuge comme entretoise entre deux feuilles métalliques 1.The view in direction B represented in FIG. 3 makes it possible to realize that the double strips 2, because of their arrangement, form a perfect convection barrier when the structure of the invention is used in an insulation as a spacer between two metal sheets 1.

La vue de dessus de la figure 4 montre que les alvéoles constituant la structure ont une forme approximativement carrée, le carré absolument parfait étant pratiquement difficile à obtenir en raison des arrondis et n'étant d'ailleurs pas strictement nécessaire pour la réalisation de la structure de l'invention. Bien que la forme carrée soit préférentielle pour les alvéoles, celles-ci pourraient également avoir une forme rectangulaire.The top view of FIG. 4 shows that the cells constituting the structure have an approximately square shape, the absolutely perfect square being practically difficult to obtain because of the rounding and, moreover, not being strictly necessary for the realization of the structure of the invention. Although the square shape is preferable for the cells, these could also have a rectangular shape.

La structure de l'invention est d'un grand intérêt par sa s.impli- cité de réalisation. Elle est en effet réalisée par étirage de métal déployé préalablement découpé et repoussé à la guillotine, les longueurs de coupe de cette dernière étant réglées de manière appropriée pour obtenir, après étirage, la structure de l'invention désirée : dans l'exemple représenté sur les figures par exemple, on voit que la longueur de coupe est double de la longueur non coupée.The structure of the invention is of great interest by its ease of implementation. It is in fact produced by stretching expanded metal previously cut and repelled by the guillotine, the cutting lengths of the latter being adjusted appropriately to obtain, after stretching, the structure of the desired invention: in the example shown on the figures for example, it can be seen that the cutting length is twice the uncut length.

L'épaisseur de la structure est réglable à volonté suivant l'utilisation désirée. Pour la constitution de calorifuges destinée aux cuves de centrales nucléaires par exemple, elle pourra être de 5 à 7 mm.The thickness of the structure is adjustable at will according to the desired use. For the constitution of heat insulation intended for the tanks of nuclear power stations for example, it could be from 5 to 7 mm.

La structure de l'invention présente une forte résistance mécanique en épaisseur, ce qui peut être important par exemple pour le calorifugeage de tuyauteries sur lesquelles on est susceptible de marcher, ou pour des réalisations industrielles diverses, par exemple la fabrication de paillassons. Par contre, sa résistance mécanique dans les sens transversal et longitudinal est faible, de sorte que le matériau peut se dilater librement sans pour autant créer de contraintes sur les goujons de fixation. Enfin, d'une façon générale, la structure de l'invention est plus économique qu'une structure habituelle de métal déployé car, en raison de l'opération d'étirage complémentaire, la densité de métal au mètre carré est moins importante.The structure of the invention has a high mechanical strength in thickness, which can be important for example for the insulation of pipes on which one is likely to walk, or for various industrial achievements, for example the manufacture of mats. On the other hand, its mechanical resistance in the transverse and longitudinal directions is low, so that the material can expand freely without creating stresses on the fixing studs. Finally, in general, the structure of the invention is more economical than a usual structure of expanded metal because, due to the additional drawing operation, the density of metal per square meter is lower.

La structure de l'invention est susceptible d'être utilisée dans toutes sortes d'industries, elle trouve une application particulièrement intéressante pour la réalisation de calorifuges.The structure of the invention is capable of being used in all kinds of industries, it finds a particularly interesting application for the production of heat insulators.

Claims (4)

1.- Panneau métallique alvéolé caractérisé en ce qu'il est constitué par un étirage de métal déployé préalablement coupé de manière à aboutir, après opération complémentaire d'étirage, à une structure en nid d'abeilles à alvéoles substantiellement carrées ou rectangulaires, de surface plane, de lanières toutes perpendiculaires à ladite surface plane, chacune desdites alvéoles comportant une première paire de côtés se faisant face, chacun composé d'une double lanière de même largeur, et une seconde paire de côtés se faisant face et constitués chacun de deux lanières mises bout à bout et en tuiles, la somme des largeurs de ces deux lanières étant par ailleurs égale à l'épaisseur commune des double- lanières constituant les deux autres côtés.1.- Honeycombed metal panel characterized in that it is constituted by a stretching of expanded metal cut beforehand so as to result, after additional stretching operation, in a honeycomb structure with substantially square or rectangular cells, of flat surface, strips all perpendicular to said flat surface, each of said cells having a first pair of sides facing each other, each composed of a double strip of the same width, and a second pair of sides facing each other and made up of two strips placed end to end and in tiles, the sum of the widths of these two strips being also equal to the common thickness of the double strips constituting the other two sides. 2.- Panneau métallique alvéolé selon la revendication 1, caractérisé en ce que lesdites alvéoles sont substantiellement carrées.2.- honeycomb metal panel according to claim 1, characterized in that said cells are substantially square. 3.- Panneau métallique alvéolé selon la revendication 1 ou la revendication 2, caractérisé par le fait que chacune des deux lanières est de largeur moitié de la largeur des doubles-lanières.3.- honeycomb metal panel according to claim 1 or claim 2, characterized in that each of the two strips is half the width of the double strips. 4.- Panneau métallique alvéolé selon l'une quelconque des revendications 1 à 3 caractérisé en ce qu'il constitue une entretoise de calorifuge.4.- honeycomb metal panel according to any one of claims 1 to 3 characterized in that it constitutes a spacer of insulation.
EP19790400201 1978-03-29 1979-03-29 Metallic thermal insulator especially for nuclear installations Expired EP0004518B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7809086 1978-03-29
FR7809086A FR2421054A1 (en) 1978-03-29 1978-03-29 ALVEOLE METAL PANEL

Publications (2)

Publication Number Publication Date
EP0004518A1 true EP0004518A1 (en) 1979-10-03
EP0004518B1 EP0004518B1 (en) 1982-02-10

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ID=9206378

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Application Number Title Priority Date Filing Date
EP19790400201 Expired EP0004518B1 (en) 1978-03-29 1979-03-29 Metallic thermal insulator especially for nuclear installations

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EP (1) EP0004518B1 (en)
DE (1) DE2962082D1 (en)
ES (1) ES479028A1 (en)
FR (1) FR2421054A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0583684A1 (en) * 1992-08-19 1994-02-23 Kurt Alten Supporting plate for bridges and ramps
FR2728603A1 (en) * 1994-12-27 1996-06-28 Lorraine Laminage Structural panel resistant to high fire temperatures

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609781A (en) * 1947-03-31 1952-09-09 Smith Corp A O Method of making expanded metal gratings
FR2249769A1 (en) * 1973-10-31 1975-05-30 Rolls Royce

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609781A (en) * 1947-03-31 1952-09-09 Smith Corp A O Method of making expanded metal gratings
FR2249769A1 (en) * 1973-10-31 1975-05-30 Rolls Royce

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0583684A1 (en) * 1992-08-19 1994-02-23 Kurt Alten Supporting plate for bridges and ramps
FR2728603A1 (en) * 1994-12-27 1996-06-28 Lorraine Laminage Structural panel resistant to high fire temperatures

Also Published As

Publication number Publication date
ES479028A1 (en) 1979-11-16
FR2421054B1 (en) 1981-09-11
FR2421054A1 (en) 1979-10-26
DE2962082D1 (en) 1982-03-18
EP0004518B1 (en) 1982-02-10

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