FR2614826A1 - Method for manufacturing test pieces of molten material and moulds for implementing this method - Google Patents

Method for manufacturing test pieces of molten material and moulds for implementing this method Download PDF

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Publication number
FR2614826A1
FR2614826A1 FR8706676A FR8706676A FR2614826A1 FR 2614826 A1 FR2614826 A1 FR 2614826A1 FR 8706676 A FR8706676 A FR 8706676A FR 8706676 A FR8706676 A FR 8706676A FR 2614826 A1 FR2614826 A1 FR 2614826A1
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Prior art keywords
mold
wall
test
strip
test pieces
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FR2614826B1 (en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0094—Moulds for concrete test samples
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
    • 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
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor
    • E04G13/021—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor for circular columns

Abstract

The invention relates to a mould 1 for manufacturing moulded test pieces 10. The wall of the mould 1 is made of cardboard, and a flexible and inextensible inner strip 3 is adhesively bonded onto it. For mould release, the loop 4 is pulled on, which tears the cardboard wall. Application: reduction of the manufacturing time, in particular for concrete test pieces 10; improvement of the quality of the test pieces.

Description

La présente invention est relative à un procédé nouveau ,pour fabriquer des éprouvettes moulées , du genre de celles qu on prépare pour effectuer des essais de résistance des matériaux . Elle concerne également , à titre de produit industriel nouveau , un moule ptur la mise en oeuvre de ce procédé
Il est connu de réaliser une éprouvette d'essai , en versant le matériau liquide dans un miule cylindrique en carton . Après solidification du matériau , on détruit le moule , pour ne la-isser subsister que l'éprouvette cylindrique . Cette dernière est alors prête pour subir les essais habituels , notamment de fatigue , de cisaillement , de traction , de flexion , de compression , ou autres.The present invention relates to a new process for manufacturing molded test pieces, of the type which are prepared for carrying out resistance tests on materials. It also relates, as a new industrial product, to a mold for the implementation of this process.
It is known practice to produce a test specimen by pouring the liquid material into a cylindrical cardboard cup. After solidification of the material, the mold is destroyed, in order to remain there only the cylindrical specimen. The latter is then ready to undergo the usual tests, in particular of fatigue, shearing, traction, bending, compression, or others.

I1 est connu de fabriquer de telles éprouvettes , notamment en béton. I1 is known to manufacture such test pieces, in particular concrete.

Pour cela , on verse habituellement le béton liquide dans un tube de carton qui est détruit sur place ,après le prise du béton . Cette destruction est généralement effectuée manuellement , par un opérateur armé d'un marteau et d'un burin pour déchirer la paroi de carton. For this, liquid concrete is usually poured into a cardboard tube which is destroyed on site, after the concrete has set. This destruction is generally carried out manually, by an operator armed with a hammer and a chisel to tear the wall of cardboard.

Ce procédé connu présente un double in convénient
Tout d'abord , il est très coûteux en main-d'oeuvre , car l'opérateur doit manipuler marteau et burin avec précaution s'il vêtit déchirer et éliminer le car- ton sans casser ou écailler le béton frais de l'éprouvette.This known process has a double disadvantage
First of all, it is very costly in terms of labor, since the operator must handle the hammer and chisel with care if he is able to tear and remove the cardboard without breaking or chipping the fresh concrete of the test piece.

Par ailleurs , on constate que , même en prenant des précautions , l'utilisateur blesse , avec son burin ,la surface en béton de l'éprouvette . On sait que ces éraflures , même peu importantes , constituent des amorces de rupture et des concentrations de contraintes , ayant pour résultat de fausser la bonne reproductibilité des essais ultérieurs. Furthermore, it can be seen that, even when taking precautions, the user injures the concrete surface of the test piece with his chisel. It is known that these scratches, even minor, constitute incipient fractures and stress concentrations, with the result of distorting the good reproducibility of the subsequent tests.

La présente invention a pour but d'éviter ces inconvénients , en réalisant , à peu de frais , des éprouvettes de qualité améliorée , qu'elles soient en béton ou en tout autre matériau moulé. The object of the present invention is to avoid these drawbacks, by producing, at low cost, test pieces of improved quality, whether made of concrete or any other molded material.

Le procédé selon l'invention , pour fabriquer une éprouvette d'essai obtenue par moulage de la ma tière d'essai dans un moule cylindrique , en carton ou analogue , est caractérisé en ce qu'après solidification de la matière , il suffit de tirer à la main sur la partie d"passante d'une bande de déchirement souple , incorporée au moule à cet effet , pour provoquer , sans l'aide d'aucun outil , le déchirement de la paroi du moule qu'on peut alors retirer et évacuer instantanément , sans blesser en aucune façon la paroi de l'éprouvette moulée. The method according to the invention, for manufacturing a test specimen obtained by molding the test material in a cylindrical mold, of cardboard or the like, is characterized in that after solidification of the material, it suffices to pull by hand on the passing part of a flexible tear strip, incorporated in the mold for this purpose, to cause, without the aid of any tool, the tearing of the wall of the mold which can then be removed and evacuate instantly, without in any way injuring the wall of the molded test piece.

Un moule à éprouvette d'sssai pour la mise en oeuvre du procédé précité comprend une paroi cylindrique en carton , ou en tout autre matériau déchirable , et il est caractérisé en ce qu'à cette paroi cylindrique est incorporée une bande souple , dont une partie dépasse hors de ladite paroi cylindrique. A test tube mold for carrying out the aforementioned method comprises a cylindrical wall made of cardboard, or any other tearable material, and it is characterized in that a flexible strip is incorporated in this cylindrical wall. protrudes outside said cylindrical wall.

Suivant une autre caractéristique de 1' invention ,la bande est constituée par un ruban souple inextensible , collé sur la face intérieure de la paroi du moule
Suivant une autre caractéristique de 1' invention ,le ruban souple est collé le long d'une des génératrices de la paroi cylindrique .According to another characteristic of the invention, the strip consists of an inextensible flexible tape, glued to the inside face of the mold wall
According to another characteristic of one invention, the flexible tape is glued along one of the generatrices of the cylindrical wall.

Suivant une autre caractéristique de 1' invention ,l 'extrémité dépassante du ruban est repliée et collée sur elle-même , de façon à constituer une boucle qui facilite l'opération de déchirement lors du démoulage. According to another characteristic of one invention, the projecting end of the tape is folded and glued on itself, so as to form a loop which facilitates the tearing operation during demolding.

Suivant une autre caractéristique de 1' invention , la bande de déchirement est constituée par un tronçon d'un ruban adhésif souple
Suivant une autre caractéristique de l' invention ,le ruban adhésif ne comporte de la matière adhésive que sur les zones à coller contre la paroi du moule , à l'exclusion de la zone qui correspond à la boucle de traction.According to another characteristic of the invention, the tear strip consists of a section of flexible adhesive tape
According to another characteristic of the invention, the adhesive tape only contains adhesive material on the areas to be glued against the wall of the mold, excluding the area which corresponds to the traction loop.

Le dessin annexé , donné à titre d' exemple non limitatif , permettra de mieux comprendre les caractéristiques de l'invention , et les avantages qu'elle est susceptible de procurer. The appended drawing, given by way of nonlimiting example, will make it possible to better understand the characteristics of the invention, and the advantages which it is likely to provide.

Figure 1 montre un moule selon l'invention , prêt à l'emploi.  Figure 1 shows a mold according to the invention, ready for use.

Figure 2 montre le tronçon de ruban adhésif avant sa mise en place. Figure 2 shows the section of adhesive tape before its installation.

Figure 3 montre la boucle de traction lorsqu'elle est en cours de confection. Figure 3 shows the traction loop when it is being made.

Figure 4 est une vue partielle du moule , montrant le détail de fixation de la bande. Figure 4 is a partial view of the mold, showing the fixing detail of the strip.

Figures 5 et 6 montrent deux phases successives de la manoeuvre de déchirement. Figures 5 and 6 show two successive phases of the tearing operation.

Figure 7 est une coupe diamétrale à la fin du déchirement. Figure 7 is a diametrical section at the end of the tear.

Figure 8 montre la paroi déchirée du moule , prêt à être éliminé. Figure 8 shows the torn wall of the mold, ready to be removed.

On a mohtré sur les dessins un moule , constitué par une paroi cylindrique 1 en carton . Il est connu d'utiliser cette paroi seule , ou bien aussi de la compléter par un fond inférieur 2. We molded on the drawings a mold, consisting of a cylindrical wall 1 of cardboard. It is known to use this wall alone, or also to complete it with a lower bottom 2.

Dans un cas comme dans l'autre , l' invention consiste à adjoindre à la paroi 1 , une bande de déchirement 3 , dont la partie supérieure dépasse sous la forme d 'une boucle de traction4 . In either case, the invention consists in adding to the wall 1, a tear strip 3, the upper part of which protrudes in the form of a traction loop 4.

Pour réaliser cette bande de déchirement 3 ' on part d'un tronçon 5 d'un ruban adhésif . Celuici comporte préférablement de la matière adhésive
- sur la aone 6 , qui sera collée contre la face interne
de la paroi cylindrique I
- sur les zones 7 et 8 , qu'on sera amené à replier l'une
contre l'autre , pour constituer la boucle de traction 4
Par contre , on évitera autant que faire se peut , la présence d'adhésif dans la zone intérieure 9 de la boucle 4 . Si toutefois de l'adhésif s'y trouvait , il suffirait de le neutraliser dans la zone 9 , par application définitive , à cet endroit , d'un revêtement en papier ou analogue.To make this tear strip 3 ', we start with a section 5 of adhesive tape. This preferably includes adhesive material
- on the edge 6, which will be glued against the internal face
of the cylindrical wall I
- on zones 7 and 8, that we will have to fold one
against each other, to form the traction loop 4
On the other hand, the presence of adhesive in the interior zone 9 of the loop 4 will be avoided as much as possible. If, however, the adhesive was there, it would suffice to neutralize it in zone 9, by definitively applying, there, a coating of paper or the like.

Le mise en place de la bande de décirement 3 s'effectue par simple application de la zone adhésive 6 contre la face interne de la paroi 1 . De préférence , on dispose la bande 3 le long d'une génératrice de la paroi cylindrique 1.  The positioning strip 3 is put in place by simple application of the adhesive zone 6 against the internal face of the wall 1. Preferably, the strip 3 is placed along a generator of the cylindrical wall 1.

Le fonctionnement est le suivant
On verse dans le moule 1 , 3 , la matière à essayer , par exemple du béton . Aussitôt après solidification , l'éprouvette de béton 10 est prête au démoulage
Pour cela , il suffit à l'utilisateur de passer son doigt 11 dans la boucle 4 , et de tirer transversalement (figure 5 , flèche 12) . Il amorce ainsi , dans la paroi de carton 1 , une déchirure 13 qui progresse vers le bas aussi longtemps qu'il tire sur la boucle 4 , en détachant une bande de carton 14 , qui forme une sorte de copeau à éliminer (figures 6 et 7) . En fin d'opéaation , il suffit d'écarter les bords déchirés 15 ( flèches 16 , figure 8) , pour détacher la paroi 1 du moule , et i'éliminer.The operation is as follows
The material to be tested is poured into the mold 1, 3, for example concrete. Immediately after solidification, the concrete specimen 10 is ready for demolding
For this, it suffices for the user to pass his finger 11 through the loop 4, and to pull transversely (FIG. 5, arrow 12). It thus initiates, in the wall of cardboard 1, a tear 13 which progresses downward as long as it pulls on the loop 4, by detaching a strip of cardboard 14, which forms a sort of chip to be eliminated (FIGS. 6 and 7). At the end of the operation, it suffices to move aside the torn edges 15 (arrows 16, FIG. 8), to detach the wall 1 from the mold, and remove it.

L'éprouvette de béton 10 se trouve ainsi instantanément dégagée , et elle présente un état de surface intact . Sa qualité est donc bien meilleure que celle des éprouvettes connues à ce jour , lorsqu'on les démoule au burin . De plus , l'invention permet d'effectuer ce démoulage instantanément , sans l'aide d'aucun outil  The concrete specimen 10 is thus instantly released, and it has an intact surface condition. Its quality is therefore much better than that of the test tubes known to date, when they are removed from the chisel. In addition, the invention allows this demolding to be carried out instantly, without the aid of any tool.

Claims (7)

REVENDICATIONS 1 - Procédé pour fabriquer une éprouvette d' essai (10) , obtenue par moulage dans la paroi cylindrique (1) d'un moule , caractérisé en ce que qu'après olidification de la matière de l'éprQuvette (10) ,on tire à la main sur la partie dépassante (4) d'une bande de déchirement (3) incorporée au moule à cet effet , pour provoquer sans l'aide d'aucun outil X le déchirement de la paroi (1) , qu'on peut alors retirer et évacuer instantanément , sans blesser en aucune manière la paroi de l'éprouvette (10). 1 - Method for manufacturing a test specimen (10), obtained by molding in the cylindrical wall (1) of a mold, characterized in that after the material of the test specimen (10) has solidified, one pulls by hand on the protruding part (4) of a tear strip (3) incorporated in the mold for this purpose, to cause without the aid of any tool X the tearing of the wall (1), which can be then remove and evacuate instantly, without in any way injuring the wall of the test piece (10). 2 - Moule à éprouvette d'essai (10) pour la mise en ouevre du procédé suivant la revendication 1 , caractérisé en àe qu'il comprend , incorporée à sa paroi cy cylindrique (1) , une bande de déchirement (3) , dont le sommet (4) dépasse au-dessus du moule. 2 - Mold with test specimen (10) for implementing the method according to claim 1, characterized in that it comprises, incorporated into its cylindrical cy wall (1), a tear strip (3), of which the top (4) protrudes above the mold. 3 -Moule à éprouvette suivant la revendica tion 2 , caractérisé en ce que le commet dépassant de la bande déchirement (3) forme une boucle de traction (4). 3 - Test-tube mold according to claim 2, characterized in that the overlap of the tear strip (3) forms a traction loop (4). 4 - Moule à éprouvette. suivant l'une quelconque des revendications 2 et 3 , caractérisé en ce que la bande (3) est constituée par un tronçon (5) d'un ruban souple inextensible , collé sur la face interne de la paroi (1) du moule. 4 - Test tube mold. according to any one of claims 2 and 3, characterized in that the strip (3) consists of a section (5) of an inextensible flexible tape, glued to the internal face of the wall (1) of the mold. 5 - Moule à éprouvette suivant l'une quelconque des revendications 2 à 4 , caractérisé en ce que le ruban souple (3) est collé le long d'une des génératrices de la paroi cylindrique (1). 5 - Test-tube mold according to any one of Claims 2 to 4, characterized in that the flexible strip (3) is glued along one of the generatrices of the cylindrical wall (1). 6 - Moule à éprouvette suivant l'une quelconque des revendications 3 à 5 , caractérisé en ce que la bande de déchirement est constituée par un tronçon (5) dtun ruban adhésif souple 6 - Test-tube mold according to any one of Claims 3 to 5, characterized in that the tear strip consists of a section (5) of flexible adhesive tape 7 - Moule à éprouvette suivant la revendication 6 , caractérisé en ce que le ruban adhésif (5) ne comporte de l'adhésif que sur les zones (6) , (7) , (8) à fixer par collage , à l'exclusion de la zone (9) qui correspond à la face interne de la boucle de traction (4).  7 - Test tube mold according to claim 6, characterized in that the adhesive tape (5) only contains adhesive on the areas (6), (7), (8) to be fixed by gluing, excluding of the zone (9) which corresponds to the internal face of the traction loop (4).
FR8706676A 1987-05-04 1987-05-04 PROCESS FOR THE MANUFACTURE OF TEST TEST TESTS IN MOLDED MATERIAL AND MOLD FOR THE IMPLEMENTATION OF THIS PROCESS Expired - Lifetime FR2614826B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8706676A FR2614826B1 (en) 1987-05-04 1987-05-04 PROCESS FOR THE MANUFACTURE OF TEST TEST TESTS IN MOLDED MATERIAL AND MOLD FOR THE IMPLEMENTATION OF THIS PROCESS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8706676A FR2614826B1 (en) 1987-05-04 1987-05-04 PROCESS FOR THE MANUFACTURE OF TEST TEST TESTS IN MOLDED MATERIAL AND MOLD FOR THE IMPLEMENTATION OF THIS PROCESS
EP88420274 1988-08-01

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FR2614826A1 true FR2614826A1 (en) 1988-11-10
FR2614826B1 FR2614826B1 (en) 1992-05-07

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587007A1 (en) * 1992-09-07 1994-03-16 de Kalbermatten, Roger Tearing element for forms, form and arrangement for making such tearing element
FR2760995A1 (en) * 1997-03-19 1998-09-25 Stradal Sa Manufacture of concrete components e.g. paving slabs, pillars border edges, or small walls
FR2796328A1 (en) * 1999-07-13 2001-01-19 Christophe Guillaume Single use disposable mold for making balustrades
FR2884169A1 (en) * 2005-04-07 2006-10-13 Spinnler Sa Mold, for concrete test piece, has tearing band with retaining portion extending above lower edge of wall and fixed on outer side of wall, where portion is maintained crimping at periphery of base with edge of wall

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE545798A (en) *
US1394255A (en) * 1920-09-23 1921-10-18 Helen M Davis Testing-mold
GB751490A (en) * 1953-12-23 1956-06-27 Sonoco Products Co Concrete form and improved method of moulding concrete columns therewith
CH322581A (en) * 1953-11-24 1957-06-30 Mauser Kg Transport container made of non-metallic material with tear-off device
DE1183432B (en) * 1961-08-04 1964-12-10 United Shoe Maohinery Corp Open container, in particular open box
US4496070A (en) * 1982-09-29 1985-01-29 Lane Jr Samuel H Container and lid forming a disposable mold

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE545798A (en) *
US1394255A (en) * 1920-09-23 1921-10-18 Helen M Davis Testing-mold
CH322581A (en) * 1953-11-24 1957-06-30 Mauser Kg Transport container made of non-metallic material with tear-off device
GB751490A (en) * 1953-12-23 1956-06-27 Sonoco Products Co Concrete form and improved method of moulding concrete columns therewith
DE1183432B (en) * 1961-08-04 1964-12-10 United Shoe Maohinery Corp Open container, in particular open box
US4496070A (en) * 1982-09-29 1985-01-29 Lane Jr Samuel H Container and lid forming a disposable mold

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587007A1 (en) * 1992-09-07 1994-03-16 de Kalbermatten, Roger Tearing element for forms, form and arrangement for making such tearing element
FR2760995A1 (en) * 1997-03-19 1998-09-25 Stradal Sa Manufacture of concrete components e.g. paving slabs, pillars border edges, or small walls
FR2796328A1 (en) * 1999-07-13 2001-01-19 Christophe Guillaume Single use disposable mold for making balustrades
FR2884169A1 (en) * 2005-04-07 2006-10-13 Spinnler Sa Mold, for concrete test piece, has tearing band with retaining portion extending above lower edge of wall and fixed on outer side of wall, where portion is maintained crimping at periphery of base with edge of wall

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Publication number Publication date
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