EP2730720A1 - Formwork support - Google Patents
Formwork support Download PDFInfo
- Publication number
- EP2730720A1 EP2730720A1 EP12191931.0A EP12191931A EP2730720A1 EP 2730720 A1 EP2730720 A1 EP 2730720A1 EP 12191931 A EP12191931 A EP 12191931A EP 2730720 A1 EP2730720 A1 EP 2730720A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- formwork support
- web
- flange
- support according
- edge protection
- 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.)
- Withdrawn
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/125—End caps therefor
-
- 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
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
- E04G11/48—Supporting structures for shutterings or frames for floors or roofs
- E04G11/50—Girders, beams, or the like as supporting members for forms
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/14—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with substantially solid, i.e. unapertured, web
Definitions
- the invention relates to a formwork support with a top flange, a bottom flange and a web connecting the top and bottom chords, upper chord, bottom chord and web consisting essentially of wood, wherein an edge protector is provided on the front side of upper chord, lower chord and web.
- Formwork support with a top chord, a bottom chord and a web connecting the top chord and the bottom chord, the top chord, bottom chord and bridge consisting essentially of wood - hereafter referred to as timber formwork support for simplicity - with an edge protection on the front side, are known from the prior art.
- Upper belt, lower flange and web are connected to each other so that an I-beam (also referred to as double T-beam) is formed.
- I-beam also referred to as double T-beam
- Such formwork supports are used for formwork in construction.
- the WO 2004/072408 A1 discloses a formwork support with a top flange, a bottom flange and a web connecting the top and bottom chords, the top chord, bottom chord and web consisting essentially of wood, wherein an edge protection is provided on the front side, which consists of plastic.
- a shock-absorbing filling material is introduced in recesses in the region of the end faces a shock-absorbing filling material is introduced.
- the CH 460 311 discloses a formwork support with a top flange, a bottom flange and a web connecting the top flange and the bottom flange, the top flange, bottom flange and web consisting essentially of wood, wherein an edge protection is provided on the front side.
- the attachment of the edge protector is effected by means of projections which are introduced into recesses of the end face of the timber formwork support.
- edge protection should protect the actual formwork beam during heavy use or fall on the front edge.
- wood chips or cracks may occur in the structure of the timber formwork support.
- the previous approaches to a plastic edge protection usually assume that this is a cost-effective wearing part that should protect the actual timber formwork. If the edge protection is damaged, it will be replaced with a new one.
- Object of the present invention is therefore to provide a formwork support, in which this disadvantage is reduced.
- a formwork support is to be provided, in which the edge protection and, associated therewith, the formwork support have a longer lifetime.
- a formwork support with a top flange, a bottom flange and a web connecting the top flange and the bottom flange, the top flange, bottom flange and web consisting essentially of wood, edge protection being provided on the front side of the top flange, bottom flange and web, which is characterized in that the edge protection rests along the web only in regions on the end face of the web.
- the applicant was able to show that the breaking strength of the edge protector is increased if it covers the entire web in the region of the end face, but does not rest on the end face of the web over the entire surface but only in places. This effect surprisingly occurs not only when the formwork support in the region of the web, but also in the region of a belt, e.g. falling down, experiencing an overload.
- the edge protection in the region of the web has a plurality of projections which form the support surface on the end face of the web. It is preferably provided that based on the end face of the web, the support surface is not more than 30%, more preferably between 5% and 15%.
- the support surface may take various forms, with linear support surfaces, e.g. diamond pattern, square pattern, trapezoidal pattern and the like have proven to be advantageous. If the formwork support in the region of the front side has rounded portions, these patterns are to be understood as the projection on the end faces.
- the edge protector completely covers the end face of the formwork support, that is to say that not only the end face of the web but also the end faces of top flange and bottom flange are completely covered.
- the edge protector is made of plastic.
- Plastics with favorable properties are, for example, polyamides (PA).
- PA66 polyamide 66
- PA66 polyamide 66
- the edge protection is integrally formed.
- it may be, for example, an injection molded part.
- the edge protector not only covers the end faces of the upper flange, lower flange and web, but also partially covers the upper flange and / or lower flange laterally. It is envisaged that the timber formwork support in the region of the upper belt and / or lower belt and laterally - that is also along the upper belt and / or lower belt - is covered by the edge protection.
- the overlap is preferably provided on the lateral outer surfaces of upper and / or lower flange. For better impact force distribution, it is also advantageous if the overlap is also provided on the inwardly facing surfaces.
- the longitudinal section through upper flange, lower flange, web along the longitudinal axis of the formwork support is rectangular.
- the formwork support has a rounding transversely to the longitudinal section in the end face region of upper flange, lower flange and web.
- the rounding is mirror-symmetrical to the longitudinal sectional plane.
- the tangent to the outermost region of the rounding is not more than 60 ° to the longitudinal plane, preferably inclined at about 45 °.
- edge protector extensions For attachment of the edge protector extensions are provided, which are introduced frictionally in recesses of the timber formwork support.
- one recess each in the upper flange and lower flange and corresponding projections on the edge protection are provided.
- a further recess in the web is provided with a corresponding extension on the edge protection.
- the extensions - if necessary with ribs and / or nubs - circular-cylindrical.
- the recesses are then also corresponding circular cylindrical (blind holes).
- Fig. 1 is in the oblique view a formwork support 1 with a top flange 2, a bottom flange 4 and the upper flange 2 and the lower flange 4 connecting web 6 disclosed. Both the upper flange 2, the lower flange 4 and the web 6 are made of wood.
- timber formwork support 1 ' Upper flange 2, lower flange 4 and web 6 are connected to each other by means of finger joints - as known per se.
- edge protector 8 rests only on the end face 16 of the web 6 at least along the web 6.
- Fig. 2 a plan view of the front side of the formwork support
- Fig. 3 a side view
- Fig. 4 a back view
- Fig. 5 a longitudinal section
- Fig. 6 a slant
- Fig. 7 show a back oblique edge
- Fig. 8 to 10 show the formwork support 1 with edge protection 8 in side view ( Fig. 8 ), in longitudinal section ( Fig. 9 ) and in cross section transverse to the longitudinal plane ( Fig. 10 ).
- the edge protection 8 has - as from the Fig. 4 and 7 visible - in the region of the web 6 projections 18, which form the support surface on the end face 16 of the web 6.
- the projections 18 have a substantially diamond-shaped pattern in plan view. By the projections 18 overloads in the entire end face region 10 are cushioned such that the edge protection 8 is no longer prone to bursting.
- the support surface 20 of the projections 18 of the edge protector 8 is in the region of the end face 16 of the web 6 about 5 to 15% of the total area of the end face sixteenth
- the timber formwork support in the frontal area is rounded, so that the projections 18 are adapted accordingly to the rounding.
- the edge protection 8 covers the entire end face 10 of the timber formwork support 1 '.
- the edge protector 8 also covers the upper flange 2 and the lower flange 4 laterally in regions with the overlaps 22 on the outer side and with the overlaps 24 on the inner side, so that the overlap 24 is also provided on the inwardly facing surfaces. All overlaps 22, 24 are provided on the lateral outer surfaces of upper flange 2 and lower flange 4.
- the formwork support 1 In longitudinal section, shown in Fig. 9 , the formwork support 1 (see Fig. 8 ) through the longitudinal axis L, ie through upper flange 2, lower flange 4 and web 6 of the formwork support 1, the sectional area E shows a rectangular shape.
- the formwork support 1 shows in section ( Fig. 10 ) transversely to the longitudinal section in the end face region of upper flange 2, lower flange 4 and web 6 clearly the rounding in the forehead area.
- the tangent in the outer region of the rounding is inclined to the longitudinal plane about 45 °.
- the edge protector 8 itself has extensions 28, one on the surface surrounding the top flange 2, one on the surface covering the bottom flange 4 and one on the surface surrounding the web 6.
- the extensions 28 protrude into recesses of the timber formwork support 1 'and are there introduced positively.
- Both the extensions 28 and the recesses have a cylindrical shape, wherein ribs are still provided on the extensions 28.
- the edge protection 8 is made of plastic.
- the plastic used was polyamide 66, which was molded by injection molding in a suitable mold.
- the edge protection 8 is integrally formed.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
Description
Die Erfindung betrifft einen Schalungsträger mit einem Obergurt, einem Untergurt und einem den Obergurt und den Untergurt verbindenden Steg, wobei Obergurt, Untergurt und Steg im Wesentlichen aus Holz bestehen, wobei auf der Stirnseite von Obergurt, Untergurt und Steg ein Kantenschutz vorgesehen ist.The invention relates to a formwork support with a top flange, a bottom flange and a web connecting the top and bottom chords, upper chord, bottom chord and web consisting essentially of wood, wherein an edge protector is provided on the front side of upper chord, lower chord and web.
Schalungsträger mit einem Obergurt, einem Untergurt und einem den Obergurt und den Untergurt verbindenden Steg, wobei Obergurt, Untergurt und Steg im Wesentlichen aus Holz bestehen - nachfolgend der Einfachheit halber als Holzschalungsträger bezeichnet - mit einem stirnseitigen Kantenschutz, sind aus dem Stand der Technik bekannt. Obergurt, Untergurt und Steg sind dabei so miteinander verbunden, dass ein I-Träger (auch als Doppel-T-Träger bezeichnet) gebildet wird. Einsatz finden solche Schalungsträger für Schalungen im Bauwesen.Formwork support with a top chord, a bottom chord and a web connecting the top chord and the bottom chord, the top chord, bottom chord and bridge consisting essentially of wood - hereafter referred to as timber formwork support for simplicity - with an edge protection on the front side, are known from the prior art. Upper belt, lower flange and web are connected to each other so that an I-beam (also referred to as double T-beam) is formed. Such formwork supports are used for formwork in construction.
Die
Die
Sowohl die
Die Praxis zeigt allerdings, dass es auf Baustellen unpraktisch ist, den Kantenschutz bei einem Schalungsträger auszutauschen, da bei Auftreten einer Beschädigung kaum Zeit für den Tausch bleibt oder kein Ersatzkantenschutz verfügbar ist.Practice shows, however, that it is impractical to replace the edge protection of a formwork support on construction sites, as there is hardly any time for replacement or no replacement edge protection is available when damage occurs.
Aufgabe der vorliegenden Erfindung ist es daher, einen Schalungsträger bereit zu stellen, bei dem dieser Nachteil vermindert ist. Insbesondere soll ein Schalungsträger bereit gestellt werden, bei dem der Kantenschutz und damit verbunden auch der Schalungsträger eine längere Lebenszeit aufweisen.Object of the present invention is therefore to provide a formwork support, in which this disadvantage is reduced. In particular, a formwork support is to be provided, in which the edge protection and, associated therewith, the formwork support have a longer lifetime.
Gelöst wird diese Aufgabe durch einen Schalungsträger mit einem Obergurt, einem Untergurt und einem den Obergurt und den Untergurt verbindenden Steg, wobei Obergurt, Untergurt und Steg im Wesentlichen aus Holz bestehen, wobei auf der Stirnseite von Obergurt, Untergurt und Steg ein Kantenschutz vorgesehen ist, welcher dadurch gekennzeichnet ist, dass der Kantenschutz entlang des Stegs nur Bereichsweise auf der Stirnfläche des Stegs aufliegt.This object is achieved by a formwork support with a top flange, a bottom flange and a web connecting the top flange and the bottom flange, the top flange, bottom flange and web consisting essentially of wood, edge protection being provided on the front side of the top flange, bottom flange and web, which is characterized in that the edge protection rests along the web only in regions on the end face of the web.
In Untersuchungen konnte der Anmelder zeigen, dass die Bruchfestigkeit des Kantenschutzes erhöht wird, wenn dieser im Bereich der Stirnseite zwar den gesamten Steg abdeckt, auf der Stirnfläche des Stegs aber nicht vollflächig sondern nur bereichsweise aufliegt. Dieser Effekt tritt überraschenderweise nicht nur dann ein, wenn der Schalungsträger im Bereich des Stegs, sondern auch im Bereich eines Gurts, z.B. durch Herunterfallen, eine Überbelastung erfährt.In tests, the applicant was able to show that the breaking strength of the edge protector is increased if it covers the entire web in the region of the end face, but does not rest on the end face of the web over the entire surface but only in places. This effect surprisingly occurs not only when the formwork support in the region of the web, but also in the region of a belt, e.g. falling down, experiencing an overload.
In einer bevorzugten Ausführungsvariante ist vorgesehen, dass der Kantenschutz im Bereich des Steges mehrere Vorsprünge aufweist, welche die Aufliegefläche auf der Stirnfläche des Stegs bilden. Bevorzugt ist vorgesehen, dass bezogen auf die Stirnfläche des Stegs die Aufliegefläche nicht mehr als 30%, besonders bevorzugt zwischen 5% und 15% beträgt. Die Aufliegefläche kann unterschiedliche Formen einnehmen, wobei sich linienförmige Aufliegeflächen, z.B. aufweisend Rautenmuster, Quadratmuster, Trapezoidmuster und dergleichen als vorteilhaft erwiesen haben. Falls der Schalungsträger im Bereich der Stirnseite Abrundungen aufweist, sind diese Muster als die Projektion auf die Stirnflächen zu verstehen.In a preferred embodiment, it is provided that the edge protection in the region of the web has a plurality of projections which form the support surface on the end face of the web. It is preferably provided that based on the end face of the web, the support surface is not more than 30%, more preferably between 5% and 15%. The support surface may take various forms, with linear support surfaces, e.g. diamond pattern, square pattern, trapezoidal pattern and the like have proven to be advantageous. If the formwork support in the region of the front side has rounded portions, these patterns are to be understood as the projection on the end faces.
In einer vorteilhaften Ausführungsvariante ist vorgesehen, dass der Kantenschutz die Stirnseite des Schalungsträgers vollständig abdeckt, d.h., dass nicht nur der Stirnfläche des Stegs sondern auch die Stirnflächen von Obergurt und Untergurt vollständig abgedeckt werden.In an advantageous embodiment, it is provided that the edge protector completely covers the end face of the formwork support, that is to say that not only the end face of the web but also the end faces of top flange and bottom flange are completely covered.
Bevorzugt ist vorgesehen, dass der Kantenschutz aus Kunststoff gefertigt ist. Kunststoffe mit günstigen Eigenschaften sind zum Beispiel Polyamide (PA). Als besonders robust hat sich im Rahmen der Erfindung Polyamid 66 (PA66) erwiesen.It is preferably provided that the edge protector is made of plastic. Plastics with favorable properties are, for example, polyamides (PA). As a particularly robust in the context of the invention polyamide 66 (PA66) has been found.
Besonders bevorzugt ist vorgesehen, dass der Kantenschutz einstückig ausgebildet ist. In diesem Fall kann es sich zum Beispiel um ein Spritzgussteil handeln.Particularly preferably, it is provided that the edge protection is integrally formed. In this case, it may be, for example, an injection molded part.
In einer weiteren vorteilhaften Ausgestaltung hat es sich als günstig erwiesen, wenn der Kantenschutz nicht nur die Stirnflächen von Obergurt, Untergurt und Steg abdeckt, sondern den Obergurt und/oder Untergurt auch seitlich bereichsweise überdeckt. Dabei ist vorgesehen, dass der Holzschalungsträger im Bereich von Obergurt und/oder Untergurt auch seitlich - das heißt auch entlang des Obergurts und/oder Untergurts - vom Kantenschutz überdeckt wird. Die Überdeckung ist bevorzugt an den seitlichen Außenflächen von Obergurt und/oder Untergurt vorgesehen. Zur besseren Stoßkraftverteilung ist es auch günstig, wenn die Überdeckung auch an den nach innen weisenden Flächen vorgesehen ist.In a further advantageous embodiment, it has proven to be advantageous if the edge protector not only covers the end faces of the upper flange, lower flange and web, but also partially covers the upper flange and / or lower flange laterally. It is envisaged that the timber formwork support in the region of the upper belt and / or lower belt and laterally - that is also along the upper belt and / or lower belt - is covered by the edge protection. The overlap is preferably provided on the lateral outer surfaces of upper and / or lower flange. For better impact force distribution, it is also advantageous if the overlap is also provided on the inwardly facing surfaces.
Obergurt, Untergurt und Steg sind beim Schalungsträger so miteinander verbunden, dass ein I-Träger (= Doppel-T-Träger) gebildet wird, wenn man die Stirnfläche des Schalungsträgers betrachtet.Upper flange, lower flange and web are connected to each other in the formwork support so that an I-beam (= double T-beam) is formed when looking at the end face of the formwork beam.
In einer bevorzugten Ausführungsvariante ist vorgesehen, dass der Längsschnitt durch Obergurt, Untergurt, Steg entlang der Längsachse des Schalungsträgers rechteckig ist. Bevorzugt ist außerdem vorgesehen, dass der Schalungsträger quer zum Längschnitt im Stirnflächenbereich von Obergurt, Untergurt und Steg eine Abrundung aufweist. Bevorzugt ist die Abrundung spiegelsymmetrisch zur Längsschnittsebene. Besonders bevorzugt ist die Tangente zum äußersten Bereich der Abrundung nicht mehr als 60° zur Längsebene, bevorzugt etwa 45° geneigt.In a preferred embodiment, it is provided that the longitudinal section through upper flange, lower flange, web along the longitudinal axis of the formwork support is rectangular. Preferably, it is also provided that the formwork support has a rounding transversely to the longitudinal section in the end face region of upper flange, lower flange and web. Preferably, the rounding is mirror-symmetrical to the longitudinal sectional plane. Particularly preferably, the tangent to the outermost region of the rounding is not more than 60 ° to the longitudinal plane, preferably inclined at about 45 °.
Zur Befestigung des Kantenschutzes sind Fortsätze vorgesehen, die in Ausnehmungen des Holzschalungsträgers kraftschlüssig eingebracht sind. Bevorzugt sind je eine Ausnehmung im Obergurt und Untergurt und entsprechende Fortsätze am Kantenschutz vorgesehen. Besonders bevorzugt ist eine weitere Ausnehmung im Steg vorgesehen mit einem korrespondierenden Fortsatz am Kantenschutz.For attachment of the edge protector extensions are provided, which are introduced frictionally in recesses of the timber formwork support. Preferably, one recess each in the upper flange and lower flange and corresponding projections on the edge protection are provided. Particularly preferably, a further recess in the web is provided with a corresponding extension on the edge protection.
Im einfachsten Fall sind die Fortsätze - gegebenenfalls mit Rippen und/oder Noppen - kreiszylinderförmig ausgebildet. Die Ausnehmungen sind dann entsprechend ebenfalls kreiszylinderförmig (Sacklockbohrungen).In the simplest case, the extensions - if necessary with ribs and / or nubs - circular-cylindrical. The recesses are then also corresponding circular cylindrical (blind holes).
Weitere Vorteile und Details der Erfindung werden nachfolgend anhand der Figuren und Figurenbeschreibungen erläutert.
- Fig. 1
- zeigt einen Schalungsträger mit Kantenschutz im Schrägriss.
- Fig. 2 bis 7
- zeigen ein Ausführungsbeispiel für einen Kantenschutz.
- Fig. 8 bis 10
- zeigen Ansichten einen Schaltungsträgers.
- Fig. 1
- shows a formwork beam with edge protection in an oblique angle.
- Fig. 2 to 7
- show an embodiment of an edge protection.
- Fig. 8 to 10
- show views of a circuit board.
In
Der Kantenschutz 8 aus
Der Kantenschutz 8 weist - wie aus den
Wie aus der
Aus den
Im Längsschnitt, dargestellt in
Der Kantenschutz 8 selbst weist Fortsätze 28 auf, und zwar einen an der Fläche, die den Obergurt 2, einen an der Fläche, die den Untergurt 4 und einen an der Fläche, die den Steg 6 überdeckt. Die Fortsätze 28 ragen in Ausnehmungen des Holzschalungsträgers 1' und sind dort kraftschlüssig eingebracht. Sowohl die Fortsätze 28 als auch die Ausnehmungen weisen eine Zylinderform auf, wobei an den Fortsätzen 28 noch Rippen vorgesehen sind.The
Der Kantenschutz 8 ist aus Kunststoff gefertigt. Als Kunststoff wurde Polyamid 66 verwendet, welches mittels Spritzguss in einer entsprechenden Form ausgeformt wurde. Der Kantenschutz 8 ist einstückig ausgebildet.The
Claims (15)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12191931.0A EP2730720A1 (en) | 2012-11-09 | 2012-11-09 | Formwork support |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12191931.0A EP2730720A1 (en) | 2012-11-09 | 2012-11-09 | Formwork support |
Publications (1)
Publication Number | Publication Date |
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EP2730720A1 true EP2730720A1 (en) | 2014-05-14 |
Family
ID=47191570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12191931.0A Withdrawn EP2730720A1 (en) | 2012-11-09 | 2012-11-09 | Formwork support |
Country Status (1)
Country | Link |
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EP (1) | EP2730720A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH460311A (en) | 1966-06-01 | 1968-07-31 | Steidle Bau E | Protective cover for an end face of wooden beams |
WO2004072408A1 (en) | 2003-02-11 | 2004-08-26 | Doka Industrie Gmbh | Formwork support |
US20080110121A1 (en) * | 2006-11-13 | 2008-05-15 | Phil Edmends | Joist end cap |
-
2012
- 2012-11-09 EP EP12191931.0A patent/EP2730720A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH460311A (en) | 1966-06-01 | 1968-07-31 | Steidle Bau E | Protective cover for an end face of wooden beams |
WO2004072408A1 (en) | 2003-02-11 | 2004-08-26 | Doka Industrie Gmbh | Formwork support |
US20080110121A1 (en) * | 2006-11-13 | 2008-05-15 | Phil Edmends | Joist end cap |
Non-Patent Citations (1)
Title |
---|
"Schalungsträger", 5 November 2012 (2012-11-05), XP055059334, Retrieved from the Internet <URL:http://www.pfeifergroup.com/fileadmin/user_upload/PDFs/Produktinfo_PF20/web_Pfeifer_Schalungstraeger_PF20_Info_2012_DEU.pdf> [retrieved on 20130411] * |
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