EP0635089B1 - Scaffolding - Google Patents

Scaffolding Download PDF

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Publication number
EP0635089B1
EP0635089B1 EP93906661A EP93906661A EP0635089B1 EP 0635089 B1 EP0635089 B1 EP 0635089B1 EP 93906661 A EP93906661 A EP 93906661A EP 93906661 A EP93906661 A EP 93906661A EP 0635089 B1 EP0635089 B1 EP 0635089B1
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EP
European Patent Office
Prior art keywords
scaffolding
legs
platforms
arms
elements
Prior art date
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.)
Expired - Lifetime
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EP93906661A
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German (de)
French (fr)
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EP0635089A1 (en
Inventor
Jean-Claude L'hermine
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LACROIX DUARIB S.A.
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LACROIX DUARIB SA
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/36—Scaffolds for particular parts of buildings or buildings of particular shape, e.g. for stairs, cupolas, domes
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/18—Scaffolds primarily resting on the ground adjustable in height
    • E04G1/20—Scaffolds comprising upright members and provision for supporting cross-members or platforms at different positions therealong
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/36—Scaffolds for particular parts of buildings or buildings of particular shape, e.g. for stairs, cupolas, domes
    • E04G1/362—Scaffolds for particular parts of buildings or buildings of particular shape, e.g. for stairs, cupolas, domes specially adapted for tanks, silos or similar vessels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/15—Scaffolds primarily resting on the ground essentially comprising special means for supporting or forming platforms; Platforms
    • E04G2001/155—Platforms with an access hatch for getting through from one level to another

Definitions

  • the present invention relates to a scaffolding, more particularly intended for use inside large hollow elements such as tanks, quarries, etc.
  • the scaffolding, object of the invention is particularly applicable to the installation of insulation in LNG tanks.
  • Scaffolds of conventional design intended for use inside hollow elements generally have a large number of elements because they crisscross the entire hollow volume, which generates high manufacturing costs and significant assembly times while by not allowing easy access or circulation at the bottom of the hollow element to be able to work there if necessary.
  • Such scaffolding is for example described in US-A-4,057,943.
  • a generally very heavy load-bearing plane resting on the ground by a large number of feet supports vertical and horizontal elements which crisscross the entire volume. Consequently, the horizontal elements can come to bear on the vertical elements. Only a small portion of the entire assembly can possibly be mounted cantilevered.
  • a scaffolding system which can be used in ship's holds and which is intended to replace known systems constituted by a juxtaposition of traditional scaffolding or by a carriage system.
  • This document proposes a structure consisting of four uprights at the four corners, provided with elevators which are integral with the beams. This structure is also heavy and expensive and does not allow simultaneous work on more than two levels.
  • the object of the present invention is therefore to propose a modular scaffolding which allows a large number of maneuvers safely and quickly while allowing to benefit from large areas for storing and preparing the materials to be used, with a very limited footprint. on the bottom of the item to be worked.
  • the modular platforms have, at their end opposite to that secured to the leg, a telescopic part.
  • the scaffolding object of the invention, comprises a support structure formed by two legs 3, connected together by at least two crosspieces 4, 5 forming decking and stiffening the assembly.
  • the legs 3 consist of a metal frame in the form of a mesh, so as to allow easy disassembly and assembly of the assembly, while allowing good circulation inside the structure of the legs.
  • the crosspieces constitute a deck which allows the legs 3 of the supporting structure to be placed in communication while constituting areas for storage and preparation of materials.
  • These decks are generally made from beams made up of modular elements which are assembled one by one so as to obtain, during disassembly, elements of small dimensions.
  • the decks occupy a higher position relative to the legs and an intermediate position.
  • the upper deck 5, which is located at the upper end of the legs 3, makes it possible to work on the ceiling of the tank as shown in FIG. 1, the intermediate deck 4 serving only as a place for storing materials.
  • a staircase hopper designated by 7 in FIG. 1, and / or by hoists and / or by elevators 17.
  • These staircase hoppers 7 are preferably arranged opposite diagonally at the level of the legs 3 in the hollow element such as a tank.
  • Modular platforms 6 are mounted at variable heights cantilevered on the external face of the legs 3 and allow users to be able to access the side walls of the hollow element.
  • These modular platforms are made up of removable floor elements arranged side by side.
  • the platforms consist of a fixed part 10 and a telescopic part formed by two removable floors 11, 12 supported by telescopic arms.
  • This platform further comprises, on the integral part of the leg 3, a storage console 12. The installation of the two insulators and of the covering at a platform level is carried out in accordance with the diagrams and according to the order of diagrams 3A to 3F.
  • the floor is made up of two modular elements 11, 12 of different dimensions.
  • one of the modular elements namely the element 11 of larger dimension, is then preserved that the element 12 is removed and placed on the storage console 13.
  • the insulation 14 which constitutes the first layer of insulation is placed on the wall of the tank.
  • the floor element 11 is replaced by the floor element 12 of smaller size, so as to leave a larger space between the layer of insulation and the end of the platform for be able to apply a coating on the insulation layer and weld the latter using a welding machine.
  • step 3D it is necessary to find the maximum space allowed between the insulation layer and the end of the platform.
  • the element 12 of small dimension of the platform is again replaced by the element 11 of larger dimension, then the second layer of insulation is affixed in this same step.
  • this second layer of insulation is fixed, in step 3E, there is again released, between the second layer of insulation and the end of the platform, a large space so as to be able to affix the coating and to be able to weld the latter by means of the welding machine.
  • step 3F the welding is finished, the installation of insulation is finished and all the removable floors can be dismantled.
  • step 3A to step 3B the adjustment of the telescopic arms supporting the removable floors forming the plate -Telescopic form is made through a connecting member 15 fixed at the ends of said arms.
  • This connecting member is actuated by the operator who pulls or repels this connecting member by means of a hook fixed to the latter.
  • This connecting member 15, affecting the shape of a plinth also serves as a stop so as to avoid any untimely fall of objects. If the operator can briefly adjust the length of the arms, indexing means are provided at the level of each arm, so as to allow the operator to quickly identify the stop positions which are predefined.
  • locking means are triggered so as to immobilize the assembly.
  • These locking means which are constituted by the indexing means or by additional means make it possible, in the event of heeling, to avoid any re-entry of the telescopes.
  • the scaffolding is constituted at the level of each leg of three lines of feet 9a, 9b and 9c capable of being adjusted in height.
  • each line of feet can be made up of several tens of feet. So like As shown in Figure 2, at the start, the three lines of pole feet on each leg rest on the ground.
  • one of the rows of post legs consisting of post feet adjustable in height is raised so as to allow work under this line, as shown in the Figure 2, representation 20b.
  • This lifting of the pole feet can also be done symmetrically at each of the legs 3 of the supporting frame. Then, as shown in Figure 2 diagram 20c, the first line of post legs comes to rest on the ground on the layer of insulation that has been added, while the second line of post legs is raised and so on. Thanks to the dimensions of the stud base soles, the contact pressure with the bottom of the tank or of the hollow element is limited and this avoids any degradation of the surface of the bottom of the hollow element. Such a configuration is only possible thanks to the entire configuration of the scaffolding which makes it possible to free 70% of the bottom of the hollow element.

Abstract

A scaffolding particularly designed for work inside large hollow elements (1) such as tanks, quarries, etc. The scaffolding comprises a supporting structure consisting of two struts (3) interconnected by at least two crossbars (4, 5) for forming the flooring and stiffening the whole scaffolding, modular platforms (6) projecting at varying heights from the outer surface of said struts (3), and members (7) providing access to said platforms and arranged in or near said struts (3). Said scaffolding may be used to lay insulators in methane tanks.

Description

La présente invention concerne un échafaudage, plus particulièrement destiné à être utilisé à l'intérieur d'éléments creux de grandes dimensions tels que des cuves, des carrières, etc. L'échafaudage, objet de l'invention, s'applique tout particulièrement à la pose d'isolants dans des cuves de méthaniers.The present invention relates to a scaffolding, more particularly intended for use inside large hollow elements such as tanks, quarries, etc. The scaffolding, object of the invention, is particularly applicable to the installation of insulation in LNG tanks.

Les échafaudages de conception classique destinés à être utilisés à l'intérieur d'éléments creux présentent généralement un grand nombre d'éléments car ils quadrillent l'ensemble du volume creux, ce qui engendre des coûts de fabrication élevés et des temps de montage importants tout en ne permettant pas d'accéder ni de circuler de manière aisée au fond de l'élément creux pour pouvoir y travailler si nécessaire.Scaffolds of conventional design intended for use inside hollow elements generally have a large number of elements because they crisscross the entire hollow volume, which generates high manufacturing costs and significant assembly times while by not allowing easy access or circulation at the bottom of the hollow element to be able to work there if necessary.

Un tel échafaudage est par exemple décrit dans le brevet US-A-4.057.943. Dans un tel échafaudage, un plan porteur généralement très lourd reposant sur le sol par un grand nombre de pieds supporte des éléments verticaux et horizontaux qui quadrillent l'ensemble du volume. En conséquence, les éléments horizontaux peuvent venir en appui sur les éléments verticaux. Seule une petite portion de l'ensemble du montage peut éventuellement être montée en porte à faux.Such scaffolding is for example described in US-A-4,057,943. In such scaffolding, a generally very heavy load-bearing plane resting on the ground by a large number of feet supports vertical and horizontal elements which crisscross the entire volume. Consequently, the horizontal elements can come to bear on the vertical elements. Only a small portion of the entire assembly can possibly be mounted cantilevered.

On connaît également, par FR-A-2.290.347, un système d'échafaudage utilisable dans des cales de navires et destiné à remplacer des systèmes connus constitués par une juxtaposition d'échafaudages traditionnels ou par un système à chariot. Ce document propose une structure constituée de quatre montants aux quatre coins, munis d'élévateurs desquels sont solidaires des poutres. Cette structure est également lourde et onéreuse et ne permet pas un travail simultané à plus de deux niveaux.Also known, from FR-A-2,290,347, is a scaffolding system which can be used in ship's holds and which is intended to replace known systems constituted by a juxtaposition of traditional scaffolding or by a carriage system. This document proposes a structure consisting of four uprights at the four corners, provided with elevators which are integral with the beams. This structure is also heavy and expensive and does not allow simultaneous work on more than two levels.

Le but de la présente invention est donc de proposer un échafaudage modulaire qui permette un grand nombre de manoeuvres en toute sécurité et avec rapidité tout en permettant de bénéficier de vastes zones de stockage et de préparation des matériaux devant être utilisés, avec une emprise très limitée sur le fond de l'élément qui doit être travaillé.The object of the present invention is therefore to propose a modular scaffolding which allows a large number of maneuvers safely and quickly while allowing to benefit from large areas for storing and preparing the materials to be used, with a very limited footprint. on the bottom of the item to be worked.

L'invention concerne à cet effet un échafaudage

  • pour le travail à l'intérieur d'éléments creux de grandes dimensions telles que des cuves, des carrières, etc,
  • du type constitué par une structure porteuse qui est destinée à reposer sur le sol et qui est munie de plates-formes modulaires montées à des hauteurs variables en porte-à-faux à la périphérie de ladite structure et de moyens d'accès auxdites plates-formes,
caractérisé en ce que
  • a) ladite structure porteuse est formée de deux jambes reliées entre elles par au moins deux traverses formant platelages, situées à des niveaux différents et rigidifiant l'ensemble,
  • b) les plates-formes modulaires sont montées sur la face externe desdites jambes et
  • c) les moyens d'accès auxdites plates-formes sont disposés dans, ou au voisinage, des jambes
et en ce que
d) les jambes de la structure porteuse sont équipées chacune d'au moins deux lignes de pieds poteaux, de préférence trois, disposées parallèlement à l'axe longitudinal de l'échafaudage, lesdits pieds poteaux étant réglables en hauteur de manière à permettre le relevage temporaire d'au moins une ligne de pieds poteaux par jambe.To this end, the invention relates to scaffolding
  • for working inside large hollow elements such as tanks, quarries, etc.,
  • of the type constituted by a support structure which is intended to rest on the ground and which is provided with modular platforms mounted at variable heights in cantilever at the periphery of said structure and means of access to said platforms shapes,
characterized in that
  • a) said supporting structure is formed by two legs connected to each other by at least two cross-members forming decks, situated at different levels and stiffening the assembly,
  • b) the modular platforms are mounted on the external face of said legs and
  • c) the means of access to said platforms are arranged in, or in the vicinity of, legs
and in that
d) the legs of the supporting structure are each equipped with at least two lines of pole feet, preferably three, arranged parallel to the longitudinal axis of the scaffolding, said pole feet being adjustable in height so as to allow the temporary lifting of at least one line of pole feet per leg.

Il est ainsi possible, notamment dans le cas d'une application de cet échafaudage à la pose d'isolants dans des cuves, d'adapter parfaitement l'échafaudage à l'évolution de la paroi dans le cas d'isolation monocouche ou multicouche et de permettre, grâce aux piètements relevables de pouvoir travailler sur le fond de la cuve, y compris en présence de l'échafaudage.It is thus possible, in particular in the case of an application of this scaffolding to the installation of insulators in tanks, to perfectly adapt the scaffolding to the evolution of the wall in the case of single-layer or multi-layer insulation and allow, thanks to the lifting legs to be able to work on the bottom of the tank, including in the presence of the scaffolding.

Selon un mode de réalisation préféré de l'invention, les plates-formes modulaires présentent, à leur extrémité opposée à celle solidaire de la jambe, une partie télescopique.According to a preferred embodiment of the invention, the modular platforms have, at their end opposite to that secured to the leg, a telescopic part.

D'autres caractéristiques et avantages de l'invention apparaîtront encore à la lecture de la description qui suit et des dessins joints, lesquels description et dessins sont donnés surtout à titre d'exemples. Dans ces dessins :

  • La figure 1 représente une vue en coupe d'un échafaudage selon un exemple de réalisation de l'invention ;
  • la figure 2 représente des schémas simplifiés des lignes de pieds poteaux des jambes de l'ossature porteuse de l'échafaudage de la figure 1 ;
  • la figure 3 représente une série de schémas fournissant un exemple de modularité des planchers des parties télescopiques des plates-formes de l'échafaudage des figures 1 et 2 ;
  • la figure 4 est une vue en perspective de l'échafaudage des figures 1 à 3 ; et
  • la figure 5 est une vue de dessus d'un étage de plate-forme exempte de plancher représentant de nouveau la modularité des planchers des parties télescopiques des plates-formes de l'échafaudage des figures 1 et 2.
Other characteristics and advantages of the invention will become apparent on reading the following description and the accompanying drawings, which description and drawings are given mainly by way of examples. In these drawings:
  • Figure 1 shows a sectional view of a scaffolding according to an exemplary embodiment of the invention;
  • FIG. 2 represents simplified diagrams of the lines of pillar feet of the legs of the supporting frame of the scaffolding of FIG. 1;
  • FIG. 3 represents a series of diagrams providing an example of modularity of the floors of the telescopic parts of the platforms of the scaffolding of FIGS. 1 and 2;
  • Figure 4 is a perspective view of the scaffolding of Figures 1 to 3; and
  • FIG. 5 is a top view of a floor with a floor-free platform again showing the modularity of the floors of the telescopic parts of the platforms of the scaffolding of FIGS. 1 and 2.

Conformément à la figure 1, l'échafaudage, objet de l'invention, comporte une structure porteuse formée de deux jambes 3, reliées entre elles par au moins deux traverses 4, 5 formant platelage et rigidifiant l'ensemble. Les jambes 3 sont constituées d'une ossature métallique se présentant sous forme d'un maillage, de manière à permettre un démontage et un montage aisés de l'ensemble, tout en permettant une bonne circulation à l'intérieur de la structure des jambes. Les traverses constituent quant à elles un platelage qui permet de mettre en communication les jambes 3 de la structure porteuse tout en constituant des zones de stockage et de préparation des matériaux. Ces platelages sont généralement réalisés à partir de poutres constituées d'éléments modulaires qui sont assemblés un à un de manière à obtenir, lors du démontage, des éléments de faibles dimensions. Dans le cas de la figure 1, les platelages occupent une position supérieure par rapport aux jambes et une position intermédiaire. Le platelage supérieur 5, qui est situé à l'extrémité supérieure des jambes 3, permet de travailler sur le plafond de la cuve comme le montre la figure 1, le platelage intermédiaire 4 servant uniquement de lieu de stockage des matériaux.According to Figure 1, the scaffolding, object of the invention, comprises a support structure formed by two legs 3, connected together by at least two crosspieces 4, 5 forming decking and stiffening the assembly. The legs 3 consist of a metal frame in the form of a mesh, so as to allow easy disassembly and assembly of the assembly, while allowing good circulation inside the structure of the legs. The crosspieces constitute a deck which allows the legs 3 of the supporting structure to be placed in communication while constituting areas for storage and preparation of materials. These decks are generally made from beams made up of modular elements which are assembled one by one so as to obtain, during disassembly, elements of small dimensions. In the case of Figure 1, the decks occupy a higher position relative to the legs and an intermediate position. The upper deck 5, which is located at the upper end of the legs 3, makes it possible to work on the ceiling of the tank as shown in FIG. 1, the intermediate deck 4 serving only as a place for storing materials.

A l'intérieur des jambes 3 ou au voisinage de ces jambes, il est prévu des moyens d'accès à différents niveaux de jambes. Ces moyens d'accès peuvent être constitués par une trémie d'escalier, désignée par 7 dans la figure 1, et/ou par des monte-charges et/ou par des ascenseurs 17. Ces trémies d'escalier 7 sont de préférence disposées opposées diagonalement au niveau des jambes 3 dans l'élément creux tel qu'une cuve. Des plates-formes modulaires 6 sont montées à des hauteurs variables en porte à faux sur la face externe des jambes 3 et permettent aux utilisateurs de pouvoir accéder aux parois latérales de l'élément creux. Ces plates-formes modulaires sont constituées d'éléments de plancher amovibles disposés côté à côte. Il est ainsi possible d'enlever un élément de plancher sans enlever l'élément qui lui est contigu dans le sens de l'axe longitudinal XX et/ou transversal de l'échafaudage ou du navire. Cette caractéristique est particulièrement intéressante pour le montage et/ou le démontage de l'ensemble. Cette modularité des plates-formes est en outre particulièrement importante quand les parois de l'élément creux ne sont pas rectilignes, ce qui est le cas dans la cuve représentée à la figure 1. Pour pouvoir accéder, à n'importe quel niveau de plates-formes, à la paroi, quelle que soit la structure de cette paroi, il est nécessaire que les plates-formes modulaires 6 présentent à leur extrémité opposée à celle solidaire de la jambe 3, une partie télescopique 8. Cette partie télescopique est représentée en gras dans les figures 1 et 5. Bien évidemment, sur toute une longueur de plancher dans le sens de l'axe longitudinal XX de l'échafaudage, on disposera de plusieurs dispositifs télescopiques de manière à pouvoir actionner les éléments du plancher constitutifs de la plate-forme indépendamment les uns des autres sur une longueur de plusieurs dizaines de mètres comme le montre la figure 5. De même, les éléments télescopiques des plates-formes disposés aux angles de la structure sont montés télescopiques suivant deux axes orthogonaux comme le montre la figure 5 afin de rendre possible toutes les configurations imaginables. Cette partie télescopique peut varier en fonction de son application et permet ainsi des travaux très différents au niveau des parois de l'élément intérieur 1. Ainsi, dans la figure 3, il est fourni un exemple de réalisation d'une partie télescopique d'une plate-forme qui permet la pose de deux isolants différents séparés par un revêtement à l'intérieur d'une cuve, cette configuration permettant à la fois de respecter la distance de sécurité entre la paroi et l'extrémité de la plate-forme et le passage d'une machine de soudure des bandes de revêtement. Ainsi, telle que le montre la figure 3, dans une première étape, les plates-formes sont constituées d'une partie fixe 10 et d'une partie télescopique formée de deux planchers amovibles 11, 12 soutenus par des bras télescopiques. Cette plate-forme comporte, en outre, sur la partie solidaire de la jambe 3, une console de rangement 12. La pose des deux isolants et du revêtement à un niveau de plate-forme s'effectue conformément aux schémas et suivant l'ordre des schémas 3A à 3F. Dans le schéma 3A, on installe le plancher constitué de deux éléments modulaires 11, 12 de dimension différente. Dans une étape 3B, l'un des éléments modulaires, à savoir l'élément 11 de plus grande dimension, est conservé alors que l'élément 12 est enlevé et placé sur la console de rangement 13. Parallèlement à cette modification du plancher, l'isolant 14 qui constitue la première couche d'isolation est placé sur la paroi de la cuve. Dans l'étape 3C, l'élément de plancher 11 est remplacé par l'élément de plancher 12 de plus petite dimension, de manière à laisser un espace plus important entre la couche d'isolant et l'extrémité de la plate-forme pour pouvoir venir apposer un revêtement sur la couche d'isolant et souder cette dernière grâce à une machine de soudure. Dans l'étape 3D, il est nécessaire de retrouver l'espace maximal autorisé entre la couche d'isolant et l'extrémité de la plate-forme. Pour ce faire, on remplace de nouveau l'élément 12 de petite dimension de la plate-forme par l'élément 11 de plus grande dimension, puis on appose dans cette même étape la deuxième couche d'isolant. Lorsque cette deuxième couche d'isolant est fixée, dans l'étape 3E, on libère de nouveau, entre la deuxième couche d'isolant et l'extrémité de la plate-forme, un espace important de manière à pouvoir venir apposer le revêtement et à pouvoir souder ce dernier au moyen de la machine à soudure. Lorsque, conformément à l'étape 3F, la soudure est terminée, la pose d'isolant est terminée et on peut démonter l'ensemble des planchers amovibles. Ainsi, en jouant sur la dimension des éléments amovibles formant le plancher télescopique de la plate-forme télescopique, il est possible de réaliser toutes les opérations de garniture et de soudure à partir d'un minimum d'éléments tout en conservant des règles de sécurité obligatoires.Inside the legs 3 or in the vicinity of these legs, means of access to different levels of legs are provided. These access means may be constituted by a staircase hopper, designated by 7 in FIG. 1, and / or by hoists and / or by elevators 17. These staircase hoppers 7 are preferably arranged opposite diagonally at the level of the legs 3 in the hollow element such as a tank. Modular platforms 6 are mounted at variable heights cantilevered on the external face of the legs 3 and allow users to be able to access the side walls of the hollow element. These modular platforms are made up of removable floor elements arranged side by side. It is thus possible to remove a floor element without removing the element which is contiguous to it in the direction of the longitudinal axis XX and / or transverse of the scaffolding or of the ship. This characteristic is particularly advantageous for the assembly and / or disassembly of the assembly. This modularity of the platforms is also particularly important when the walls of the hollow element are not straight, which is the case in the tank represented in FIG. 1. To be able to access, at any level of platforms -forms, to the wall, whatever the structure of this wall, it is necessary that the modular platforms 6 have at their end opposite to that secured to the leg 3, a telescopic part 8. This telescopic part is shown in bold in Figures 1 and 5. Obviously, over a whole length of floor in the direction of the longitudinal axis XX of the scaffolding, there will be several telescopic devices so to be able to actuate the elements of the floor constituting the platform independently of each other over a length of several tens of meters as shown in Figure 5. Likewise, the telescopic elements of the platforms arranged at the corners of the structure are telescopically mounted along two orthogonal axes as shown in Figure 5 in order to make all imaginable configurations possible. This telescopic part can vary depending on its application and thus allows very different work at the walls of the inner element 1. Thus, in Figure 3, there is provided an embodiment of a telescopic part of a platform which allows the installation of two different insulators separated by a coating inside a tank, this configuration allowing both to respect the safety distance between the wall and the end of the platform and the passage of a machine for welding the covering strips. Thus, as shown in FIG. 3, in a first step, the platforms consist of a fixed part 10 and a telescopic part formed by two removable floors 11, 12 supported by telescopic arms. This platform further comprises, on the integral part of the leg 3, a storage console 12. The installation of the two insulators and of the covering at a platform level is carried out in accordance with the diagrams and according to the order of diagrams 3A to 3F. In diagram 3A, the floor is made up of two modular elements 11, 12 of different dimensions. In a step 3B, one of the modular elements, namely the element 11 of larger dimension, is then preserved that the element 12 is removed and placed on the storage console 13. In parallel with this modification of the floor, the insulation 14 which constitutes the first layer of insulation is placed on the wall of the tank. In step 3C, the floor element 11 is replaced by the floor element 12 of smaller size, so as to leave a larger space between the layer of insulation and the end of the platform for be able to apply a coating on the insulation layer and weld the latter using a welding machine. In step 3D, it is necessary to find the maximum space allowed between the insulation layer and the end of the platform. To do this, the element 12 of small dimension of the platform is again replaced by the element 11 of larger dimension, then the second layer of insulation is affixed in this same step. When this second layer of insulation is fixed, in step 3E, there is again released, between the second layer of insulation and the end of the platform, a large space so as to be able to affix the coating and to be able to weld the latter by means of the welding machine. When, in accordance with step 3F, the welding is finished, the installation of insulation is finished and all the removable floors can be dismantled. Thus, by playing on the dimension of the removable elements forming the telescopic floor of the telescopic platform, it is possible to carry out all the lining and welding operations using a minimum of elements while maintaining safety rules. mandatory.

Pour passer d'une étape à une autre, c'est-à-dire de l'étape 3A à l'étape 3B, de l'étape 3B à 3C, etc, le réglage des bras télescopiques supportant les planchers amovibles formant la plate-forme télescopique se fait grâce à un organe de liaison 15 fixé aux extrémités desdits bras. Cet organe de liaison est actionné par l'opérateur qui tire ou repousse cet organe de liaison grâce à un crochet fixé à ce dernier. Cet organe de liaison 15, affectant la forme d'une plinthe, sert également de butée de manière à éviter toute chute intempestive d'objets. Si l'opérateur peut ajuster sommairement la longueur des bras, des moyens d'indexation sont prévus au niveau de chaque bras, de manière à permettre à l'opérateur d'identifier rapidement les positions d'arrêt qui sont prédéfinies. Dans ces positions d'arrêt, des moyens de verrouillage sont déclenchés de manière à immobiliser l'ensemble. Ces moyens de verrouillage qui sont constitués par les moyens d'indexation ou par des moyens supplémentaires permettent, en cas de gîte, d'éviter toute rentrée des télescopes. Une fois les bras télescopiques immobilisés dans une position, le plancher requis formé des éléments 11 et 12 dans la figure 3 est posé. On note que toutes ces manipulations sont effectuées très rapidement et en toute sécurité par un seul opérateur. Il est à noter qu'on prévoira généralement, également, des éléments télescopiques supplémentaires terminés par une platine d'appui. Ces éléments sont, à une extrémité, solidaires de la structure et viennent au moyen de leur platine, à l'autre extrémité, en appui sur la paroi de la cuve en construction, de manière à éviter tout mouvement relatif de l'échafaudage en cas de gîte.To go from one step to another, that is to say from step 3A to step 3B, from step 3B to 3C, etc., the adjustment of the telescopic arms supporting the removable floors forming the plate -Telescopic form is made through a connecting member 15 fixed at the ends of said arms. This connecting member is actuated by the operator who pulls or repels this connecting member by means of a hook fixed to the latter. This connecting member 15, affecting the shape of a plinth, also serves as a stop so as to avoid any untimely fall of objects. If the operator can briefly adjust the length of the arms, indexing means are provided at the level of each arm, so as to allow the operator to quickly identify the stop positions which are predefined. In these stop positions, locking means are triggered so as to immobilize the assembly. These locking means which are constituted by the indexing means or by additional means make it possible, in the event of heeling, to avoid any re-entry of the telescopes. Once the telescopic arms immobilized in a position, the required floor formed of elements 11 and 12 in Figure 3 is laid. Note that all these manipulations are carried out very quickly and safely by a single operator. It should be noted that provision will also generally be made for additional telescopic elements terminated by a support plate. These elements are, at one end, integral with the structure and come by means of their plate, at the other end, bearing on the wall of the tank under construction, so as to avoid any relative movement of the scaffolding in the event of lodging.

Une autre particularité de cet échafaudage réside dans son piètement qui permet de travailler sur le fond de l'élément creux, y compris en présence de l'échafaudage. Ainsi, conformément à la figure 2, l'échafaudage est constitué au niveau de chaque jambe de trois lignes de pieds 9a, 9b et 9c susceptibles d'être réglées en hauteur. Bien évidemment, chaque ligne de pieds peut être constituée de plusieurs dizaines de pieds. Ainsi, comme le montre la figure 2, au départ, les trois lignes de pieds poteaux de chaque jambe reposent au sol. Lorsqu'il apparaît nécessaire de travailler au fond de la cuve ou de l'élément creux, l'une des lignes de pieds poteaux constituée de pieds poteaux réglables en hauteur est relevée de manière à permettre le travail sous cette ligne, comme le montre la figure 2, représentation 20b. Ce relevage des pieds poteaux peut d'ailleurs s'effectuer de manière symétrique au niveau de chacune des jambes 3 de l'ossature porteuse. Ensuite, comme le montre la figure 2 schéma 20c, la première ligne de pieds poteaux vient en appui au sol sur la couche d'isolants qui a été rajoutée, alors que la deuxième ligne de pieds poteaux est soulevée et ainsi de suite. Grâce aux dimensions des semelles de pieds poteaux, la pression de contact avec le fond de la cuve ou de l'élément creux est limitée et on évite ainsi toute dégradation de la surface du fond de l'élément creux. Une telle configuration n'est possible que grâce à l'ensemble de la configuration de l'échafaudage qui permet de libérer 70 % du fond de l'élément creux. Pour pouvoir également travailler simultanément sur les cloisons transversales d'un élément creux, que ce soit une cuve ou tout autre élément, il est nécessaire de relier les jambes de l'ossature porteuse par une plate-forme périphérique, télescopique ou non, comme le montre la figure 4. Ainsi, dans le cas de cuves destinées au transport de méthane, les cloisons transversales, appelées COFFERDAM, sont travaillées grâce à une plate-forme périphérique désignée par 16 dans la figure 4 qui relie deux jambes de l'ossature porteuse.Another peculiarity of this scaffolding resides in its base which makes it possible to work on the bottom of the hollow element, including in the presence of the scaffolding. Thus, in accordance with FIG. 2, the scaffolding is constituted at the level of each leg of three lines of feet 9a, 9b and 9c capable of being adjusted in height. Obviously, each line of feet can be made up of several tens of feet. So like As shown in Figure 2, at the start, the three lines of pole feet on each leg rest on the ground. When it appears necessary to work at the bottom of the tank or of the hollow element, one of the rows of post legs consisting of post feet adjustable in height is raised so as to allow work under this line, as shown in the Figure 2, representation 20b. This lifting of the pole feet can also be done symmetrically at each of the legs 3 of the supporting frame. Then, as shown in Figure 2 diagram 20c, the first line of post legs comes to rest on the ground on the layer of insulation that has been added, while the second line of post legs is raised and so on. Thanks to the dimensions of the stud base soles, the contact pressure with the bottom of the tank or of the hollow element is limited and this avoids any degradation of the surface of the bottom of the hollow element. Such a configuration is only possible thanks to the entire configuration of the scaffolding which makes it possible to free 70% of the bottom of the hollow element. To also be able to work simultaneously on the transverse partitions of a hollow element, whether it is a tank or any other element, it is necessary to connect the legs of the supporting frame by a peripheral platform, telescopic or not, as the shows figure 4. Thus, in the case of tanks intended for the transport of methane, the transverse partitions, called COFFERDAM, are worked thanks to a peripheral platform indicated by 16 in figure 4 which connects two legs of the supporting framework .

Claims (7)

  1. Scaffolding
    - for working within hollow elements (1) large dimensions such as tanks, quarries, etc,
    - of the type constituted by a carrying structure which is intended to rest on ground and which is equipped with modular platforms (6) mounted at variable heights in cantilever fashion on the periphery of said structure and with access means (7) to said platforms,
    characterized in that
    a) said carrying structure is formed of two legs (3) connected to each other by at least two cross members (4, 5) forming floorings, situated at different levels and rigidifying the assembly,
    b) the modular platforms (6) are mounted on the external face of said legs (3) and
    c) the access means (7) to said platforms are disposed within, or at the vicinity of the legs (3)
    and in that
       d) the legs of the carrying structure are each equipped of at least two lines of post feet, preferably three (9a, 9b, 9c), disposed parallel to the longitudinal axis of the scaffolding, said post feet being adjustable in height so as to pemit the temporary raising of at least one line of post feet per leg.
  2. Scaffolding according to claim 1,
    characterized in that the modular platforms (6) present at their end opposite to the secured to the leg (3) a telescopic portion (8).
  3. Scaffolding according to claim 2,
    characterized in that said telescopic portion (8) is formed by at least two telescopic arms supporting a removable flooring and whose ends are interconnected by a connection member (15) on which the operator acts to vary the length of said arms.
  4. Scaffolding according to claim 3,
    characterized in that the connection member (15) constitutes also a plinth preventing any untimely falling of objects.
  5. Scaffolding according to one of claims 2 to 4,
    characterized in that said arms are provided with indexing means which permet locking the arms into predetermined lengths.
  6. Scaffolding according to one of claims 1 to 5,
    characterized in that the constituent elements of scaffolding are realized such that their disassociation permits obtaining elements of very small size.
  7. Use of the scaffolding according to one of claims 1 to 6 for the installation of insulations against the walls of the tank of a methane tanker.
EP93906661A 1992-03-30 1993-03-24 Scaffolding Expired - Lifetime EP0635089B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9203798 1992-03-30
FR9203798A FR2689161B1 (en) 1992-03-30 1992-03-30 SCAFFOLDING.
PCT/FR1993/000295 WO1993020307A1 (en) 1992-03-30 1993-03-24 Scaffolding

Publications (2)

Publication Number Publication Date
EP0635089A1 EP0635089A1 (en) 1995-01-25
EP0635089B1 true EP0635089B1 (en) 1996-12-18

Family

ID=9428220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93906661A Expired - Lifetime EP0635089B1 (en) 1992-03-30 1993-03-24 Scaffolding

Country Status (7)

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US (1) US5613573A (en)
EP (1) EP0635089B1 (en)
KR (1) KR0174764B1 (en)
DE (1) DE69306771T2 (en)
FI (1) FI944307A (en)
FR (1) FR2689161B1 (en)
WO (1) WO1993020307A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2804984B1 (en) 2000-02-10 2002-09-20 Entrepose Echafaudages SCAFFOLDING SYSTEM FOR VARIOUS SHAPED CAPACITIES
KR101083440B1 (en) * 2005-03-25 2011-11-14 대우조선해양 주식회사 Scaffold
JP4583394B2 (en) 2006-03-03 2010-11-17 韓国ガス公社 Scaffolding device and heat insulation system installation method using the same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910379A (en) * 1973-11-30 1975-10-07 Robert E Miller System for construction of monolithic concrete tanks and silos
SU510572A1 (en) * 1974-05-12 1976-04-15 Предприятие П/Я Р-6476 The woods
GB1472458A (en) * 1974-06-21 1977-05-04 Shell Int Research Apparatus and a method for treating a surface in particular for spraying an insulating foam on a wall
FR2290347A1 (en) * 1974-11-08 1976-06-04 Mitsubishi Heavy Ind Ltd Scaffolding system for hold of ship - has elevator pairs on columns supporting platforms with travelling working positions
CH582816A5 (en) * 1975-02-14 1976-12-15 Vevey Atel Const Mec
US4057943A (en) * 1976-02-23 1977-11-15 Swiss Fabricating, Inc. Modular scaffolding for assembling the inside of an LNG vessel
FR2384708A1 (en) * 1977-03-21 1978-10-20 Reus Bv J De Structure for inspecting interior of ships and storage tanks - has permanent pylon supporting removable horizontal girder on vertically movable platform (NO 16.10.78)
DE3611431C2 (en) * 1986-04-05 1995-09-21 Eberhard Layher Scaffolding support for bridging sidewalks

Also Published As

Publication number Publication date
FI944307A0 (en) 1994-09-16
DE69306771D1 (en) 1997-01-30
EP0635089A1 (en) 1995-01-25
US5613573A (en) 1997-03-25
KR0174764B1 (en) 1999-02-18
DE69306771T2 (en) 1997-06-26
FR2689161B1 (en) 1996-09-13
FR2689161A1 (en) 1993-10-01
WO1993020307A1 (en) 1993-10-14
KR950701034A (en) 1995-02-20
FI944307A (en) 1994-09-16

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