EP0356905A1 - Concrete spacer - Google Patents
Concrete spacer Download PDFInfo
- Publication number
- EP0356905A1 EP0356905A1 EP89115594A EP89115594A EP0356905A1 EP 0356905 A1 EP0356905 A1 EP 0356905A1 EP 89115594 A EP89115594 A EP 89115594A EP 89115594 A EP89115594 A EP 89115594A EP 0356905 A1 EP0356905 A1 EP 0356905A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- concrete
- formwork
- roughness
- extrusion
- reinforcement
- 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.)
- Granted
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/20—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Building Environments (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
Description
Die Erfindung betrifft einen Betonabstandhalter zur Festlegung des Abstandes zwischen Bewehrung und Schalung beim Betonieren.The invention relates to a concrete spacer for determining the distance between reinforcement and formwork when concreting.
Beim Betonieren muss die Stahlbewehrung einen definierten Abstand von der Schalung aufweisen, um vom Frischbeton ganz umschlossen und bedeckt werden zu können. Für die Dauerhaftigkeit von Bauwerken aus Stahlbeton und Spannbeton ist die Dicke und Dichtigkeit der Betondeckung der Bewehrung im Hinblick auf die Gefahr der Korrosion der Bewehrung von entscheidender Bedeutung. Um die erforderliche Betondeckung sicherzustellen, werden Abstandhaltern verwendet.When concreting, the steel reinforcement must be at a defined distance from the formwork in order to be completely enclosed and covered by the fresh concrete. For the durability of structures made of reinforced concrete and prestressed concrete, the thickness and tightness of the concrete cover of the reinforcement is of crucial importance with regard to the risk of corrosion of the reinforcement. Spacers are used to ensure the required concrete cover.
Gebräuchliche Abstandhalter sind beispielsweise aus dem Beton-Kalender 1986 S.475-477, herausgegeben vom Verlag für Architektur und technische Wissenschaften Berlin, entnehmbar.Common spacers can be found, for example, in the concrete calendar 1986 p.475-477, published by the publishing house for architecture and technical sciences Berlin.
Wie die Erfahrung gezeigt hat, wird mit den bekannten Abstandhaltern jedoch keine befriedigende Betondeckung, insbesondere was ihre Dichtigkeit anbetrifft, erreicht. Grundsätzlich sind Abstandhalter, auch solche aus Beton, Fremdkörper im Beton. Vor allem bei der Aushärtung und Austrockung des Betons, wie auch durch Wärmespannungen, treten zwischen ihnen und dem sie umgebenden Betonmaterial Schwindrisse auf, durch welche Wasser mit der Zeit zur Bewehrung vordringen kann. Einen Verbund mit dem sie umgebenden Beton gehen die bekannten Abstandhalter, die alle eine relativ glatte Oberfläche aufweisen, nicht ein.As experience has shown, however, the known spacers do not achieve a satisfactory concrete covering, particularly with regard to their tightness. Spacers, including those made of concrete, are basically foreign objects in the concrete. Especially when the concrete hardens and dries out, as well as due to thermal stresses, shrinkage cracks occur between them and the surrounding concrete material, through which water can penetrate into the reinforcement over time. The known spacers, which all have a relatively smooth surface, do not form a bond with the concrete surrounding them.
Der Erfindung liegt die Aufgabe zugrunde, einen Betonabstandhalter sowie ein Verfahren zu seiner Herstellung anzugeben, welcher mit dem ihn umgebenden Beton einen derart guten Verbund eingeht, dass eine befriedigend dichte Betondeckung der Bewehrung beim Betonieren erreicht wird. Die erfindungsgemässe Lösung dieser Aufgabe kennzeichnet sich hinsichtlich der Ausgestaltung des Betonabstandhalters durch die Merkmale des Anspruchs 1 und hinsichtlich seiner Herstellung durch die Merkmale des Anspruchs 5.The invention has for its object to provide a concrete spacer and a method for its production, which forms such a good bond with the surrounding concrete that a satisfactorily tight concrete covering of the reinforcement is achieved during concreting. The solution to this problem according to the invention is characterized in terms of the design of the concrete spacer by the features of claim 1 and in terms of its manufacture by the features of claim 5.
Ausführungsbeispiele der Erfindung werden im folgenden mit Bezug auf die Zeichnung erläutert. Es zeigen:
- Fig.1 einen Betonabstandhalter in perspektivischer Darstellung mit rauhen Umfangsflächen vor dem Betonieren und
- Fig.2 einen Querschnitt durch einen Betonabstandhalter mit profilierten Seitenflächen.
- 1 shows a concrete spacer in perspective with rough peripheral surfaces before concreting and
- 2 shows a cross section through a concrete spacer with profiled side surfaces.
Der in Fig.1 dargestellte Betonabstandhalter weist einen trapezförmigen Querschnitt auf. Seine gegeneinander winklig geneigten Seitenflächen, von denen nur die mit 1 bezeichnete Seitenfläche sichtbar ist, sowie auch seine vordere, mit 2 bezeichnete, sowie seine ebenfalls nicht sichtbare hintere Stirnfläche weisen eine mindestens der Körnigkeit des Frischbetons, in den er einbetoniert werden soll, entsprechende Rauhigkeit auf. Dabei ist unter der Rauhigkeit die äquivalente Rauhigkeit zu verstehen, die sich durch Aufbringen einer einkörnigen Schicht des grobkörnigsten Materials im Frischbeton auf eine glatte Oberfläche ergeben würde. Jedenfalls sollte die Rauhtiefe zwischen etwa 2 und 5 mm betragen.The concrete spacer shown in Figure 1 has a trapezoidal cross-section. Its side surfaces inclined at an angle to each other, of which only the side surface designated by 1 is visible, as well as its front end surface, designated by 2, and its rear face surface, likewise not visible, have a roughness corresponding at least to the grain of the fresh concrete in which it is to be concreted on. The roughness is to be understood as the equivalent roughness that would result from applying a one-grain layer of the coarsest grain material in fresh concrete to a smooth surface. In any case, the roughness should be between about 2 and 5 mm.
Der Betonabstandhalter wird beispielsweise, wie in Fig.1 dargestellt, auf eine waagerechte Schalung 3 aufgelegt. Auf ihn kommt dann die Bewehrung zu liegen, von der ein Bewehrungseisen 4 dargestellt ist.The concrete spacer is placed, for example, as shown in Fig.1, on a horizontal formwork 3. The reinforcement then comes to rest on it, of which a
Durch die Rauhigkeit der Flächen 1 und 2 sowie ihre jeweils gegenüberliegenden Flächen ergibt sich beim Betonieren ein ausreichender Verbund zwischen ihnen und dem Frischbeton, der auch beim Aushärten und Austrocknen des Frischbetons sowie unter Wärmespannungen erhalten bleibt. Dadurch wird in vorteilhafter Weise eine ausgezeichnet dichte Betondeckung der Bewehrung 4 erreicht und ein Vordringen von Wasser zur Bewehrung 4 und deren Korrosion verhindert.Due to the roughness of the
Durch seinen trapezförmigen Querschnitt ist der in Fig.1 dargestellte Betonabstandhalter sicher in dem ihn umgebenden Beton verankert, und dadurch nach Wegnahme der Schalung 3 gegen ein Herausfallen gesichert.Due to its trapezoidal cross-section, the concrete spacer shown in FIG. 1 is securely anchored in the concrete surrounding it, and is thus secured against falling out after the formwork 3 has been removed.
Die nach Wegnahme der Schalung 3 von aussen sichtbare untere Fläche des Betonabstandhalters, die in Fig.1 nicht sichtbar ist, weist vorzugsweise eine der Rauhigkeit der Schalung entsprechende, allgemein eine der Rauhigkeit von Sichtbeton entsprechende Oberflächenbeschaffenheit auf, um sich möglichst gut an die sie umgebende Betonfläche anzupassen.The lower surface of the concrete spacer visible from the outside after removal of the formwork 3, which is not visible in FIG. 1 preferably has a surface texture corresponding to the roughness of the formwork, generally a surface texture corresponding to the roughness of exposed concrete, in order to adapt as well as possible to the surrounding concrete surface.
Anstelle mit einer mindestens der Körnung des Frischbetons entsprechenden Rauhigkeit können die mit dem Frischbeton zwischen Schalung und Bewehrung in Kontakt tretenden Oberflächenpartien des Betonabstandhalters auch mit einer dieser Rauhigkeit mindestens entsprechenden Profilierung mit parallel zur Schalung verlaufenden Rillen oder Graten versehen sein. Fig.2 zeigt einen Betonabstandhalter im Querschnitt mit verschiedenartigen Rillen bzw. Graten.Instead of having a roughness corresponding at least to the grain size of the fresh concrete, the surface parts of the concrete spacer which come into contact with the fresh concrete between formwork and reinforcement can also be provided with a profile at least corresponding to this roughness with grooves or ridges running parallel to the formwork. Fig. 2 shows a concrete spacer in cross section with different types of grooves or ridges.
Selbstverständlich können die Konzepte Rauhigkeit und Profilierung auch kombiniert miteinander verwendet werden.Of course, the concepts of roughness and profiling can also be used in combination.
Betonabstandhalter nach Fig.1 und 2 können rationell mittels eines Strangpressverfahrens mit anschliessender Aufteilung des Strangs in kürzere Stücke hergestellt werden. Das Strangpressverfahren ist ein bekanntes Verfahren und braucht deshalb hier nicht weiter erläutert zu werden.Concrete spacers according to Fig. 1 and 2 can be efficiently produced by means of an extrusion process with subsequent division of the strand into shorter pieces. The extrusion process is a known process and therefore need not be explained further here.
Zur Erzielung der gewünschten Rauhigkeit und/oder Profilierung der Seitenflächen kann die Austrittsöffnung der zur Strangpressung verwendeten Vorrichtung entsprechend profiliert oder gezahnt ausgebildet sein. Die gewünschte Rauhigkeit der Seitenflächen ergibt sich insbesondere durch Verwendung einer körnigen Mörtelmasse zum Strangpressen und lässt sich durch Abstimmung der Körnigkeit der Mörtelmasse mit der Feinheit der Zahnung oder Profilierung der Austrittsöffnung der Strangpressvorrichtung kontrollieren. Vorzugsweise sollte die Korngrösse der Mörtelmasse bis zu 2 mm betragen.In order to achieve the desired roughness and / or profiling of the side surfaces, the outlet opening of the device used for the extrusion can be correspondingly profiled or toothed. The desired roughness of the side surfaces results in particular from the use of a granular mortar for extrusion and can be checked by coordinating the granularity of the mortar with the fineness of the teeth or profiling the outlet opening of the extrusion device. The grain size should preferably be Mortar mass up to 2 mm.
Bei Verwendung eines körnigen Mörtelmaterials ergibt sich die gewünschte Rauhigkeit der beiden übrigen mit dem Frischbeton zwischen der Bewehrung und der Schalung in Kontakt tretenden Oberflächenpartien, nach dem Vorstehenden, der Stirnflächen, bei der Aufteilung des Strangs in kürzere Stücke im übrigen automatisch, wenn die Aufteilung durch Brechen ausgeführt wird.When using a granular mortar material, the desired roughness of the other two parts of the surface that come into contact with the fresh concrete between the reinforcement and the formwork, according to the above, the end faces, automatically results when the strand is divided into shorter pieces if the division is carried out by Breaking is running.
Anstatt durch eine profiliert oder gezahnt ausgebildete Austrittsöffnung der Strangpressvorrichtung kann die Profilierung der Seitenflächen der Betonabstandhalter auch durch eine Rändelung des Strangs, z.B. direkt hinter der Austrittsöffnung der Strangpressvorrichtung erreicht werden.Instead of a profiled or toothed outlet opening of the extrusion device, the profiling of the side surfaces of the concrete spacers can also be achieved by knurling the strand, e.g. can be reached directly behind the outlet opening of the extrusion device.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89115594T ATE94604T1 (en) | 1988-08-29 | 1989-08-23 | CONCRETE SPACERS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH320588 | 1988-08-29 | ||
CH3205/88 | 1988-08-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0356905A1 true EP0356905A1 (en) | 1990-03-07 |
EP0356905B1 EP0356905B1 (en) | 1993-09-15 |
Family
ID=4250942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89115594A Expired - Lifetime EP0356905B1 (en) | 1988-08-29 | 1989-08-23 | Concrete spacer |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0356905B1 (en) |
AT (1) | ATE94604T1 (en) |
DE (2) | DE8902698U1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0519385A1 (en) * | 1991-06-19 | 1992-12-23 | Siegfried Dreizler | Method for the production of a reinforcement spacer and spacer |
EP3272482B1 (en) * | 2016-07-18 | 2019-07-10 | BAG Bauartikel GmbH | Method for manufacturing concrete spacers |
CN114046749A (en) * | 2021-10-26 | 2022-02-15 | 刘红霞 | Method and system for detecting roughness of point-shaped pit joint surface of precast concrete member |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1012540C2 (en) * | 1999-07-08 | 2001-01-15 | Molenaar Betonindustrie B V | Distance holder for holding at predetermined distance reinforcement in relation to chosen surface is contact or engagement with one or more reinforcement wires or bars or onee or more of their outer ends |
DE102012004785A1 (en) * | 2012-03-06 | 2013-09-12 | beweka Betonwerk Kahla GmbH | Spacer for insertion into components integrated with textile structures that are made of e.g. base material, has shaft formed with projections, which are actuatedly connected with one or multiple parts of through holes of separator |
DE102012004787B4 (en) * | 2012-03-06 | 2016-08-11 | Technische Universität Dresden | Spacer insert for insertion into components to be produced with a base material with integrated textile reinforcement layers |
DE102012025629A1 (en) | 2012-03-06 | 2014-01-02 | beweka Betonwerk Kahla GmbH | Spacer for insertion into components with integrated textile reinforcement, has component outer surface which is formed between textile reinforcements over textile crossing yarns for defining spacing of textile reinforcement layer |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1425619A (en) * | 1965-01-27 | 1966-01-24 | Improvements in manufacturing processes for flat elements based on clay or mineral compounds, for tiles, wall coverings and other uses | |
FR1454176A (en) * | 1965-11-10 | 1966-07-22 | Baustahlgewebe Gmbh | concrete element to support the lower reinforcement, in reinforced concrete rooms |
FR1467381A (en) * | 1965-02-04 | 1967-01-27 | Method and device for detaching ceramic plates from one another after firing | |
FR2041523A5 (en) * | 1969-04-28 | 1971-01-29 | Meissonnier Jose | |
EP0015614A1 (en) * | 1979-03-01 | 1980-09-17 | Koninklijke Mosa B.V. | Method and device for the manufacture of cleaving tiles and cleaving tile obtained |
EP0173988A2 (en) * | 1984-09-03 | 1986-03-12 | Walter Hoff | Insert member for concrete formworks |
-
1989
- 1989-03-06 DE DE8902698U patent/DE8902698U1/de not_active Expired
- 1989-08-23 DE DE89115594T patent/DE58905611D1/en not_active Expired - Fee Related
- 1989-08-23 EP EP89115594A patent/EP0356905B1/en not_active Expired - Lifetime
- 1989-08-23 AT AT89115594T patent/ATE94604T1/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1425619A (en) * | 1965-01-27 | 1966-01-24 | Improvements in manufacturing processes for flat elements based on clay or mineral compounds, for tiles, wall coverings and other uses | |
FR1467381A (en) * | 1965-02-04 | 1967-01-27 | Method and device for detaching ceramic plates from one another after firing | |
FR1454176A (en) * | 1965-11-10 | 1966-07-22 | Baustahlgewebe Gmbh | concrete element to support the lower reinforcement, in reinforced concrete rooms |
FR2041523A5 (en) * | 1969-04-28 | 1971-01-29 | Meissonnier Jose | |
EP0015614A1 (en) * | 1979-03-01 | 1980-09-17 | Koninklijke Mosa B.V. | Method and device for the manufacture of cleaving tiles and cleaving tile obtained |
EP0173988A2 (en) * | 1984-09-03 | 1986-03-12 | Walter Hoff | Insert member for concrete formworks |
Non-Patent Citations (1)
Title |
---|
STRASSEN- UND TIEFBAU, Band 42, nr. 7/8, 1988, Seiten 21-27, Giesel-Verlag f. Publizität, Isernhagen, DE; E.B. GRUNAU: "Abstandshalter zur Sicherung der vorgeschriebenen Mindestbetondeckung" * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0519385A1 (en) * | 1991-06-19 | 1992-12-23 | Siegfried Dreizler | Method for the production of a reinforcement spacer and spacer |
US5410850A (en) * | 1991-06-19 | 1995-05-02 | Dreizler; Siegfried | Spacer for reinforcements |
EP3272482B1 (en) * | 2016-07-18 | 2019-07-10 | BAG Bauartikel GmbH | Method for manufacturing concrete spacers |
CN114046749A (en) * | 2021-10-26 | 2022-02-15 | 刘红霞 | Method and system for detecting roughness of point-shaped pit joint surface of precast concrete member |
CN114046749B (en) * | 2021-10-26 | 2022-07-08 | 刘红霞 | Method and system for detecting roughness of point-shaped pit joint surface of precast concrete member |
Also Published As
Publication number | Publication date |
---|---|
ATE94604T1 (en) | 1993-10-15 |
EP0356905B1 (en) | 1993-09-15 |
DE8902698U1 (en) | 1989-06-08 |
DE58905611D1 (en) | 1993-10-21 |
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