EP0522384A1 - Anchoring element - Google Patents

Anchoring element Download PDF

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Publication number
EP0522384A1
EP0522384A1 EP92110901A EP92110901A EP0522384A1 EP 0522384 A1 EP0522384 A1 EP 0522384A1 EP 92110901 A EP92110901 A EP 92110901A EP 92110901 A EP92110901 A EP 92110901A EP 0522384 A1 EP0522384 A1 EP 0522384A1
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EP
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Prior art keywords
anchoring element
anchor
anchoring
insulating material
electrically insulating
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Granted
Application number
EP92110901A
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German (de)
French (fr)
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EP0522384B1 (en
Inventor
Roland Keller
Urs Albrecht-Dessimoz
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Paul Keller Ingenieurburo AG
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Paul Keller Ingenieurburo AG
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Publication of EP0522384A1 publication Critical patent/EP0522384A1/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor

Definitions

  • the invention relates to an anchoring element for anchoring a floor anchor to a component according to the preamble of claim 1.
  • Such anchoring elements are used primarily in civil engineering to anchor strands of a ground anchor with a few meters to a few tens of meters sunk in the ground and anchored there by casting with a cement mass at their upper end to the component to be held, for example a retaining wall.
  • Such a ground anchor consists essentially of several steel strands with a sheathing, usually from a corrosion protection compound and a plastic tube, which is enclosed in a closed protective tube made of polyethylene in the area of its lower end for better anchoring, the outside of which in the area of the lower end for better anchoring revolving waves is provided, are guided.
  • the protective tube extends back into the lead-through channel in the anchoring element and breaks off there, while the strands are completely pulled through it and protrude beyond the opening in the anchoring plate.
  • the anchor head is poured by pouring cement into the borehole next to the protective tube and filling the area of the borehole located outside the protective tube, while the volume enclosed by the protective tube is passed through a through-duct through the duct up to the surface of the hose is also filled with cement.
  • the ground anchor is anchored to the component by placing an anchor bush on the outer surface of the anchor plate with an opening for each strand through which it is pulled.
  • the strands are then tensioned under support on the anchor bushing until the desired tension, usually a total of several tons, is reached.
  • the strands Since the strands have to withstand very high tension, it is very important that they are protected as well as possible from corrosion even in the inaccessible area, especially in the area of the anchor head. It is known to check again after the strands have been tightened whether the protective tube, which is crucial for corrosion protection, is intact. This is done by applying a voltage between the strands and earth and measuring the resulting current. Since the protective tube is electrically insulating, but the surrounding cement mass and the soil, if only slightly, is conductive, the measured current provides information as to whether and if and to what extent the protective tube is damaged. If the ground anchor is intact, the lead-through channel is at least partially filled with cement paste and the space between the anchoring element and an anchor lead-through, which is embedded in the component, is filled with the same weight.
  • the invention is intended to remedy this.
  • the invention as characterized in the claims, creates an anchoring element in which there is no short circuit between the seat and the ground even after filling the anchor connector and the anchor bushing, so that the protective tube can be checked at any time even after the anchoring has been completed. In this way, impairments to the corrosion protection can be determined at any time and remedial measures can be initiated before the strands lose their functionality. Dangerous situations are largely avoidable.
  • the ground anchor 1 shown in FIG. 1 (see also FIG. 2) for anchoring a component 2 consists of several strands 3, which are guided in a protective tube 4 made of polyethylene, which is in a hole in the ground that is several meters to several tens of meters deep is sunk.
  • the protective tube 4 is ribbed in the end region, the anchor head 5, for better anchoring in the surrounding cement mass with which it is cast on the outside and inside.
  • the pouring is carried out by introducing cement mass into the borehole next to the protective tube 4 and filling the volume enclosed by the protective tube 4 via an injection hose (not shown) guided in the same.
  • the strands 3 are very firmly anchored in the borehole in this way. Except on the uppermost section of the ground anchor 1, they have a covering (not shown) made of a corrosion protection compound and a plastic tube as additional corrosion protection.
  • the protective tube 4 extends into an anchoring element 6, more precisely its anchor stub 7, and breaks off there, while the strands 3 pass through the tubular anchor stub 7 and one surrounded by the same circular opening 8 in a square anchoring plate 9, on the support surface 10 of which the anchor stub 7 attaches, are guided beyond an outer surface 11 of the anchoring plate 9 opposite the support surface 10.
  • the inside of the anchor stub 7 from a lead-through opening 12, through which the protective tube 4 with the strands 3 is guided, to the mouth of the opening 8 in the outer surface 11 forms a lead-through channel 13 in which the uppermost section of the ground anchor 1 is guided.
  • the anchoring element is mounted in an anchor bushing 14 in the component 2, which is to be held by the floor anchor 1.
  • the anchor head is already poured with cement.
  • the strands 3 are guided through an anchor bushing 15, which has an opening for each strand 3, and were tensioned thereon with support. They exert a pull of several tons on the anchor bushing 15, which is supported on the outer surface 11 of the anchoring plate 9.
  • the protection tube 4 is now checked by applying a voltage between the upper ends of the strands 3 and earth and monitoring the resulting current. Since the protective tube 4 is made of electrically insulating material, practically no current may flow if it is intact. However, if there is a leak at any point, current flows over the cement mass and the soil, which indicates that the corrosion protection is impaired.
  • the duct 13 is at least partially filled with cement paste, the space between the outside of the Anchor connector 7 and the anchor bushing 14 is also poured with cement paste.
  • At least the boundary surface of that region of the lead-through channel 13 which comes into contact with the cement mass is now H. at least one section of the feed opening 12 connecting it, made of an electrically insulating material, preferably plastic - but other materials, e.g. B. ceramics, in question - formed.
  • an electrically insulating material preferably plastic - but other materials, e.g. B. ceramics, in question - formed.
  • anchoring element 6 instead of isolating the anchoring element 6 on the inside, it can in principle also be insulated from the outside, that is to say against the potting compound filled in between the anchoring element 6 and the anchor bushing 14 and the component 2 lies, and the support surface 10 of the anchoring plate 9, preferably also the outer surface 11 and edge surfaces 16, which laterally delimit the anchoring plate 9 and connect the outer surface 11 to the support surface 10, consist of insulating material.
  • a first embodiment shown in Fig. 3a, b, shows an anchoring element 6, which is made of steel in a conventional manner.
  • both the anchor connector 7 and the anchoring plate 9 are completely covered with plastic, preferably polyamide. From the edge surface 16 there is a casting bore 17 extending to the opening 8, which serves to introduce the cement mass into the interior of the anchor connector 7 during pouring.
  • Anchoring element 6 according to FIGS. 4a, b which differs from that shown in FIGS. 3a, b only in that the anchor connector 7 consists entirely of polyamide, while the anchoring plate 9 is designed as a steel plate coated with polyamide on all sides.
  • the anchoring element 6 according to the invention according to FIGS. 5a, b corresponds in structure to the two described above, but consists entirely of polyamide.
  • polyamide is particularly suitable for use in the anchoring elements according to the invention, but it is also possible to use other, possibly also several different, electrically insulating materials.
  • the lead-through opening 12 is sealed in such a way that there is no electrical connection between the casting compounds in the lead-through channel 13 and outside the anchor stub 7.
  • Such a seal can in principle be achieved by a seal clamped in the area of the passage opening 12 between the wall of the passage channel 13 and the outside of the protective tube 4 or by casting the passage opening 12 with an electrically insulating compound.
  • both methods are not very reliable under the conditions prevailing at a construction site.
  • the anchoring element 6 shown in FIG. 6 It has a pipe section 18 which is inserted with a sealing section 19 into the through opening 12 up to a shoulder 20 forming a stop is. Between the end face of the pipe section 18 and the shoulder 20 is a sealing ring 21a, for. B. clamped from rubber, on the towards the end of the armature connector 7 to two more between the outside of the sealing portion 19 and the inner wall of the passage channel 13 clamped sealing rings 21b, c follow, so that the connection between the pipe section 18 and the armature connector 7 is reliably tight .
  • An electrical welding sleeve 22 connected to the sealing section 19 is connected to it by mirror welding.
  • the electric welding sleeve 22 is supplied with current and fused to the outside of the protective tube 4. While the welding sleeve 22 contracts slightly, the sealing section 19 is not affected by the welding, so that the tightness of its connection to the anchor connector 7 is not impaired.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
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Abstract

An anchoring element (6) for anchoring a ground anchor (1) to a structural member (2) to be supported, for the purpose of allowing the intactness of a closed protective tube (4) which encloses strands (3) of the ground anchor (1) in the bore hole and protects the strands (3) from corrosion to be checked by applying a voltage between the strands (3) and earth and measuring the resulting current even after the grouting of the uppermost section of the ground anchor (1) in a lead-through passage (13) in the anchoring element (6) and of the latter in an anchor lead-through (14) with a cement mass, is made of an electrically insulating material, preferably polyamide, at least to such an extent that there is no electrically conductive connection between the strands (3) and the cement mass in the lead-through passage (13) on the one hand and the cement mass outside the same and the structural member (2) on the other hand. The anchoring element (6) can be made of steel, for example, and can be covered with a polyamide coating, or it can have an anchor connection piece (7) of polyamide and an anchoring plate (9) of steel with a polyamide coating or can also be made entirely of polyamide. The anchoring element (6) can comprise a tube piece which consists of a sealing section inserted in a sealing manner into the lead-through passage (13) and of an electrically welded sleeve which axially adjoins the sealing section and which is fused together with the protective tube (4). <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verankerungselement zur Verankerung eines Bodenankers an einem Bauteil gemäss dem Oberbegriff des Anspruchs 1.The invention relates to an anchoring element for anchoring a floor anchor to a component according to the preamble of claim 1.

Derartige Verankerungselemente werden vor allem im Tiefbau dazu verwendet, Litzen eines Bodenankers mit einige Meter bis einige zehn Meter im Boden versenktem und dort durch Vergiessen mit einer Zementmasse verankertem Ankerkopf an ihrem oberen Ende am zu haltenden Bauteil, etwa einer stützmauer, zu verankern.Such anchoring elements are used primarily in civil engineering to anchor strands of a ground anchor with a few meters to a few tens of meters sunk in the ground and anchored there by casting with a cement mass at their upper end to the component to be held, for example a retaining wall.

Ein derartiger Bodenanker besteht im wesentlichen aus mehreren Stahllitzen mit einer Ummantelung, gewöhnlich aus einer Korrosionsschutzmasse und einem Kunststoffrohr, welche in einem geschlossenen, im Bereich seines unteren Endes zur besseren Verankerung gerippten Schutzrohr aus Polyethylen, dessen Aussenseite im Bereich des unteren Endes zur besseren Verankerung mit umlaufenden Wellen versehen ist, geführt sind. Das Schutzrohr reicht bis in den Durchführungskanal im Verankerungselement zurück und bricht dort ab, während die Litzen vollständig durch denselben gezogen sind und über die Oeffnung in der Verankerungsplatte hinausragen.Such a ground anchor consists essentially of several steel strands with a sheathing, usually from a corrosion protection compound and a plastic tube, which is enclosed in a closed protective tube made of polyethylene in the area of its lower end for better anchoring, the outside of which in the area of the lower end for better anchoring revolving waves is provided, are guided. The protective tube extends back into the lead-through channel in the anchoring element and breaks off there, while the strands are completely pulled through it and protrude beyond the opening in the anchoring plate.

Der Ankerkopf wird vergossen, indem neben dem Schutzrohr Zement in das Bohrloch eingeleitet und der ausserhalb des Schutzrohres gelegene Bereich des Bohrloches ausgefüllt wird, während das vom Schutzrohr umschlossene Volumen durch einen in demselben geführten, durch den Durchführungskanal bis an die Oberfläche reichenden Schlauch ebenfalls mit Zement aufgefüllt wird.The anchor head is poured by pouring cement into the borehole next to the protective tube and filling the area of the borehole located outside the protective tube, while the volume enclosed by the protective tube is passed through a through-duct through the duct up to the surface of the hose is also filled with cement.

Die Verankerung des Bodenankers am Bauteil wird durchgeführt, indem auf die Aussenfläche der Verankerungsplatte eine Ankerbuchse aufgesetzt wird mit einer Oeffnung für jede Litze, durch die dieselbe gezogen wird. Anschliessend werden die Litzen unter Abstützung auf die Ankerbuchse gespannt, bis der gewünschte Zug, meist im Ganzen mehrere Tonnen, erreicht ist.The ground anchor is anchored to the component by placing an anchor bush on the outer surface of the anchor plate with an opening for each strand through which it is pulled. The strands are then tensioned under support on the anchor bushing until the desired tension, usually a total of several tons, is reached.

Da die Litzen sehr grossen Zug aushalten müssen, ist es sehr wichtig, dass sie auch im unzugänglichen Bereich, insbesondere im Bereich des Ankerkopfs, so gut wie möglich vor Korrosion geschützt sind. Es ist bekannt, nach dem Anziehen der Litzen noch einmal zu überprüfen, ob das für den Korrosionsschutz entscheidend wichtige Schutzrohr intakt ist und zwar geschieht das durch Anlegen einer Spannung zwischen Litzen und Erde und Messung des resultierenden Stroms. Da das Schutzrohr elektrisch isolierend ist, die umgebende Zementmasse und das Erdreich jedoch, wenn auch nur geringfügig, leitend, so gibt der gemessene Strom darüber Aufschluss, ob und wenn, in welchem Ausmass das Schutzrohr verletzt ist. Ist der Bodenanker intakt, so wird der Durchführungskanal wenigstens teilweise mit Zementmasse ausgefüllt und auch der Zwischenraum zwischen dem Verankerungselement und einer Ankerdurchführung, welche im Bauteil eingelassen ist, mit der gleichen Masse vergossen.Since the strands have to withstand very high tension, it is very important that they are protected as well as possible from corrosion even in the inaccessible area, especially in the area of the anchor head. It is known to check again after the strands have been tightened whether the protective tube, which is crucial for corrosion protection, is intact. This is done by applying a voltage between the strands and earth and measuring the resulting current. Since the protective tube is electrically insulating, but the surrounding cement mass and the soil, if only slightly, is conductive, the measured current provides information as to whether and if and to what extent the protective tube is damaged. If the ground anchor is intact, the lead-through channel is at least partially filled with cement paste and the space between the anchoring element and an anchor lead-through, which is embedded in the component, is filled with the same weight.

Bei bekannten, durchwegs aus Metall hergestellten Verankerungselementen bildet sich durch das Vergiessen ein Kurzschluss zwischen den Litzen und Erde, der eine Ueberprüfung der Intaktheit des Schutzrohrs im weiteren ausschliesst. Das hat zur Folge, dass eine nach Fertigstellung der Verankerung eintretende Verletzung des Schutzrohrs nicht festgestellt werden kann. Dadurch können unbemerkt sehr gefährliche Situationen entstehen, da bei nicht intaktem Schutzrohr die sitzen korrodieren und abreissen können, was z. B. den Einsturz einer Stützmauer mit Folgen wie Nachrutschen von Erdmassen, Einsturz von Gebäuden etc. nach sich ziehen kann.In the case of known anchoring elements, which are made entirely of metal, a short circuit between the strands and earth is formed as a result of the potting, which further excludes a check of the integrity of the protective tube. As a result, an injury to the Protective tube can not be determined. This can cause very dangerous situations to go unnoticed, since if the protective tube is not intact, the seats can corrode and tear off. B. the collapse of a retaining wall with consequences such as slipping earth, building collapse etc.

Hier soll die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, schafft ein Verankerungselement, bei welchem auch nach dem Auffüllen des Ankerstutzens und der Ankerdurchführung kein Kurzschluss zwischen sitzen und Erde vorliegt, sodass auch nach der Fertigstellung der Verankerung eine Kontrolle des Schutzrohrs jederzeit möglich ist. Dadurch können Beeinträchtigungen des Korrosionsschutzes jederzeit festgestellt und Abhilfsmassnahmen eingeleitet werden, bevor die Litzen ihre Funktionsfähigkeit verlieren. Gefährliche Situationen sind so weitgehend vermeidbar.The invention is intended to remedy this. The invention, as characterized in the claims, creates an anchoring element in which there is no short circuit between the seat and the ground even after filling the anchor connector and the anchor bushing, so that the protective tube can be checked at any time even after the anchoring has been completed. In this way, impairments to the corrosion protection can be determined at any time and remedial measures can be initiated before the strands lose their functionality. Dangerous situations are largely avoidable.

Im folgenden wird die Erfindung anhand von lediglich Ausführungsbeispiele darstellenden Zeichnungen erläutert.
Es zeigen

Fig. 1
im Längsschnitt eine Uebersichtsdarstellung eines Bodenankers,
Fig. 2
detailliert den obersten Abschnitt des Bodenankers nach Fig. 1 mit Ankerdurchführung und Verankervngselement,
Fig. 3a
eine erste Ausführung eines erfindungsgemässen Verankerungselements im Längsschnitt nach A-A in Fig. 3b,
Fig. 3b
einen Querschnitt längs B-B in Fig. 3a,
Fig. 4a,b
eine zweite Ausführung eines erfindungsgemässen Verankerungselements in Darstellungen, die denen der Fig. 3a,b entsprechen,
Fig. 5a,b
eine dritte Ausführung eines erfindungsgemässen Verankerungselements in Darstellungen, die denen der Fig. 3a,b entsprechen und
Fig. 6
eine vierte Ausführungsform eines erfindungsgemässen Verankerungselements im Längsschnitt.
In the following, the invention will be explained with reference to drawings that show exemplary embodiments only.
Show it
Fig. 1
in longitudinal section an overview of a ground anchor,
Fig. 2
1 with the anchor bushing and anchoring element,
Fig. 3a
3b shows a first embodiment of an anchoring element according to the invention in longitudinal section according to AA,
Fig. 3b
3 shows a cross section along BB in FIG. 3a,
4a, b
a second embodiment of an anchoring element according to the invention in representations that correspond to those of FIGS. 3a, b,
5a, b
a third embodiment of an anchoring element according to the invention in representations that correspond to those of FIGS. 3a, b and
Fig. 6
a fourth embodiment of an anchoring element according to the invention in longitudinal section.

Der in Fig. 1 (s. auch Fig. 2) dargestellte Bodenanker 1 zur Verankerung eines Bauteils 2 besteht aus mehreren Litzen 3, welche in einem Schutzrohr 4 aus Polyethylen geführt sind, das in eine mehrere Meter bis mehrere zehn Meter tiefe Bohrung im Boden versenkt ist. Das Schutzrohr 4 ist im Endbereich, dem Ankerkopf 5 zur besseren Verankerung in der umgebenden Zementmasse, mit der es aussen und innen vergossen ist, gerippt. Das Vergiessen erfolgt durch Einleiten von Zementmasse in das Bohrloch neben dem Schutzrohr 4 und Auffüllen des vom Schutzrohr 4 umschlossenen Volumens über einen in demselben geführten Injektionsschlauch (nicht dargestellt). Die Litzen 3 sind auf diese Weise im Bohrloch sehr fest verankert. Sie weisen, ausser am obersten Abschnitt des Bodenankers 1, als zusätzlichen Korrosionsschutz eine Umhüllung (nicht dargestellt) aus einer Korrosiosschutzmasse und einem Kunststoffrohr auf.The ground anchor 1 shown in FIG. 1 (see also FIG. 2) for anchoring a component 2 consists of several strands 3, which are guided in a protective tube 4 made of polyethylene, which is in a hole in the ground that is several meters to several tens of meters deep is sunk. The protective tube 4 is ribbed in the end region, the anchor head 5, for better anchoring in the surrounding cement mass with which it is cast on the outside and inside. The pouring is carried out by introducing cement mass into the borehole next to the protective tube 4 and filling the volume enclosed by the protective tube 4 via an injection hose (not shown) guided in the same. The strands 3 are very firmly anchored in the borehole in this way. Except on the uppermost section of the ground anchor 1, they have a covering (not shown) made of a corrosion protection compound and a plastic tube as additional corrosion protection.

Am oberen Ende reicht das Schutzrohr 4 in ein Verankerungselement 6, genauer gesagt dessen Ankerstutzen 7 und bricht dort ab, während die Litzen 3 durch den rohrförmigen Ankerstutzen 7 und eine von demselben umgebene kreisrunde Oeffnung 8 in einer guadratischen Verankerungsplatte 9, an deren Abstützfläche 10 der Ankerstutzen 7 ansetzt, über eine der Abstützfläche 10 gegenüberliegende Aussenfläche 11 der Verankerungsplatte 9 hinaus geführt sind. Das Innere des Ankerstutzens 7 von einer Durchführungsöffnung 12, durch die das Schutzrohr 4 mit den Litzen 3 geführt ist, bis zur Mündung der Oeffnung 8 in der Aussenfläche 11 bildet einen Durchführungskanal 13, in dem der oberste Abschnitt des Bodenankers 1 geführt ist.At the upper end, the protective tube 4 extends into an anchoring element 6, more precisely its anchor stub 7, and breaks off there, while the strands 3 pass through the tubular anchor stub 7 and one surrounded by the same circular opening 8 in a square anchoring plate 9, on the support surface 10 of which the anchor stub 7 attaches, are guided beyond an outer surface 11 of the anchoring plate 9 opposite the support surface 10. The inside of the anchor stub 7 from a lead-through opening 12, through which the protective tube 4 with the strands 3 is guided, to the mouth of the opening 8 in the outer surface 11 forms a lead-through channel 13 in which the uppermost section of the ground anchor 1 is guided.

Das Verankerungselement ist in einer Ankerdurchführung 14 im Bauteil 2 gelagert, das durch den Bodenanker 1 gehalten werden soll.The anchoring element is mounted in an anchor bushing 14 in the component 2, which is to be held by the floor anchor 1.

Im in Fig. 1, 2 dargestellten Stadium der Montage ist der Ankerkopf bereits mit Zement vergossen. Die Litzen 3 sind durch eine Ankerbuchse 15, die für jede Litze 3 eine Oeffnung aufweist, geführt und wurden unter Abstützung auf dieselbe gespannt. Sie üben auf die Ankerbuchse 15, die auf der Aussenfläche 11 der Verankerungsplatte 9 abgestützt ist, einen Zug von mehreren Tonnen aus.In the stage of assembly shown in Fig. 1, 2, the anchor head is already poured with cement. The strands 3 are guided through an anchor bushing 15, which has an opening for each strand 3, and were tensioned thereon with support. They exert a pull of several tons on the anchor bushing 15, which is supported on the outer surface 11 of the anchoring plate 9.

Gewöhnlich folgt nun die Ueberprüfung des Schutzrohrs 4 durch Anlegen einer Spannung zwischen den oberen Enden der Litzen 3 und Erde und Ueberwachen des resultierenden Stroms. Da das Schutzrohr 4 aus elektrisch isolierendem Material besteht, darf, wenn es intakt ist, praktisch kein Strom fliessen. Ist es jedoch an irgendeiner Stelle undicht, so fliesst über die Zementmasse und das Erdreich Strom, der eine Beeinträchtigung des Korrosionsschutzes anzeigt.Usually the protection tube 4 is now checked by applying a voltage between the upper ends of the strands 3 and earth and monitoring the resulting current. Since the protective tube 4 is made of electrically insulating material, practically no current may flow if it is intact. However, if there is a leak at any point, current flows over the cement mass and the soil, which indicates that the corrosion protection is impaired.

Ist das Schutzrohr 4 intakt, wird nun der Durchführungskanal 13 mindestens teilweise mit Zementmasse aufgefüllt, der Zwischenraum zwischen der Aussenseite des Ankerstutzens 7 und der Ankerdurchführung 14 wird ebenfalls mit Zementmasse vergossen.If the protective tube 4 is intact, the duct 13 is at least partially filled with cement paste, the space between the outside of the Anchor connector 7 and the anchor bushing 14 is also poured with cement paste.

Bei einem erfindungsgemässen Verankerungselement 6 wird nun wenigstens die Begrenzungsfläche desjenigen Bereichs des Durchführungskanals 13, welcher mit der Zementmasse in Berührung kommt, d. h. mindestens ein an die Durchführungsöffnung 12 anschliessender Abschnitt desselben, von einem elektrisch isolierenden Material, vorzugsweise Kunststoff - es kommen aber auch andere Materialien, z. B. Keramik, in Frage - gebildet. Dadurch sowie durch Isolation der Ankerbuchse 15 von der Aussenfläche 11 des Verankerungsplatte 9, z. B. durch eine Isolationszwischenschicht, und durch eine ausreichende Abdichtung der Durchführungsöffnung 12, durch die der Bodenanker 1 geführt ist, wird jede elektrische Verbindung zwischen den Litzen 3 und der Zementmasse im Durchführungskanal 13 einerseits und der Zementmasse ausserhalb des Ankerstutzens 7 sowie dem Bauteil 2 und umgebendem Erdreich andererseits unterbunden.In the case of an anchoring element 6 according to the invention, at least the boundary surface of that region of the lead-through channel 13 which comes into contact with the cement mass is now H. at least one section of the feed opening 12 connecting it, made of an electrically insulating material, preferably plastic - but other materials, e.g. B. ceramics, in question - formed. As a result, and by isolating the anchor bush 15 from the outer surface 11 of the anchoring plate 9, for. B. by an intermediate insulation layer, and by a sufficient seal of the through hole 12 through which the floor anchor 1 is guided, each electrical connection between the strands 3 and the cement mass in the duct 13 on the one hand and the cement mass outside the anchor connector 7 and the component 2 and surrounding soil on the other hand prevented.

Wird zwischen den oberen Enden der Litzen 3 und Erde eine Spannung angelegt, so kann Strom - wie vor dem Vergiessen - weiterhin nur durch allfällige Risse im Schutzrohr 4 fliessen. Die Messung des Stroms gibt also weiterhin über die Intaktheit desselben Aufschluss, sodass eine permanente Ueberwachung oder periodische Ueberprüfung nach Fertigstellung der Verankerung möglich ist und gefährliche Beeinträchtigungen des Korrosionsschutzes der Litzen 3 in einem frühen Stadium festgestellt werden können.If a voltage is applied between the upper ends of the strands 3 and earth, current can continue to flow - as before the casting - only through any cracks in the protective tube 4. The measurement of the current therefore also provides information about the intactness of the same, so that permanent monitoring or periodic checking after completion of the anchoring is possible and dangerous impairments of the corrosion protection of the strands 3 can be determined at an early stage.

Aus Sicherheitsgründen empfiehlt es sich, mindestens die gesamte Begrenzungsfläche des Durchführungskanals 13 und am besten auch die Aussenfläche 11 der Verankerungsplatte 9 aus isolierendem Material zu bilden, da durch Feuchtigkeit oder Zementspritzer sonst leicht Kriechstrecken entstehen können, die die Messung verfälschen oder verunmöglichen. In jedem Fall empfiehlt es sich, mindestens den Teil der Aussenfläche 11, auf den die Ankerbuchse 15 abgestützt ist, isolierend auszubilden, sodass weitere Massnahmen zur gegenseitigen Isolierung von Ankerbuchse 15 und Verankerungsplatte 9 nicht erforderlich sind.For safety reasons, it is advisable to form at least the entire boundary surface of the feed-through channel 13 and, best of all, the outer surface 11 of the anchoring plate 9 from insulating material, since otherwise creepage distances can easily occur due to moisture or cement splashes that can falsify or make the measurement impossible. In any case, it is advisable to provide at least the part of the outer surface 11 on which the armature bushing 15 is supported, so that further measures for the mutual insulation of the armature bushing 15 and the anchoring plate 9 are not necessary.

Statt das Verankerungselement 6 innen zu isolieren, kann man es prinzipiell auch nach aussen isolieren, also gegen die zwischen das Verankerungselement 6 und die Ankerdurchführung 14 eingefüllte Vergussmasse und den Bauteil 2. Dabei müssen mindestens die Oberfläche des Ankerstutzens 7, soweit sie ausserhalb der Durchführungsöffnung 12 liegt, und die Abstützfläche 10 der Verankerungsplatte 9, vorzugsweise auch die Aussenfläche 11 und Randflächen 16, die die Verankerungsplatte 9 seitlich begrenzen und die Aussenfläche 11 mit der Abstützfläche 10 verbinden, aus isolierendem Material bestehen.Instead of isolating the anchoring element 6 on the inside, it can in principle also be insulated from the outside, that is to say against the potting compound filled in between the anchoring element 6 and the anchor bushing 14 and the component 2 lies, and the support surface 10 of the anchoring plate 9, preferably also the outer surface 11 and edge surfaces 16, which laterally delimit the anchoring plate 9 and connect the outer surface 11 to the support surface 10, consist of insulating material.

In der Praxis hat es sich bewährt, eine doppelte Sicherung vorzusehen und das Verankerungselement 6 so auszubilden, dass seine gesamte Oberfläche von elektrisch isolierendem Material gebildet wird.In practice, it has proven useful to provide double securing and to form the anchoring element 6 such that its entire surface is formed by electrically insulating material.

Eine erste Ausführungsform, dargestellt in Fig. 3a,b, zeigt ein Verankerungselement 6, das in herkömmlicher Weise aus Stahl hergestellt ist.A first embodiment, shown in Fig. 3a, b, shows an anchoring element 6, which is made of steel in a conventional manner.

Erfindungsgemäss sind jedoch sowohl der Ankerstutzen 7 als auch die Verankerungsplatte 9 vollständig mit Kunststoff, vorzugsweise Polyamid, überzogen. Von der Randfläche 16 her ist eine bis zur Oeffnung 8 reichende Eingussbohrung 17 angebracht, die der Einführung der Zementmasse in das Innere des Ankerstutzens 7 beim Vergiessen dient.According to the invention, however, both the anchor connector 7 and the anchoring plate 9 are completely covered with plastic, preferably polyamide. From the edge surface 16 there is a casting bore 17 extending to the opening 8, which serves to introduce the cement mass into the interior of the anchor connector 7 during pouring.

Weitgehend gleich ist das erfindungsgemässe Verankerungselement 6 nach Fig. 4a,b aufgebaut, das sich von dem in Fig. 3a,b dargestellten nur dadurch unterscheidet, dass der Ankerstutzen 7 vollständig aus Polyamid besteht, während die Verankerungsplatte 9 als allseitig polyamidbeschichtete Stahlplatte ausgebildet ist.This is largely the same according to the invention Anchoring element 6 according to FIGS. 4a, b, which differs from that shown in FIGS. 3a, b only in that the anchor connector 7 consists entirely of polyamide, while the anchoring plate 9 is designed as a steel plate coated with polyamide on all sides.

Das erfindungsgemässe Verankerungselement 6 nach Fig. 5a,b entspricht im Aufbau den beiden oben beschriebenen, besteht jedoch vollständig aus Polyamid.The anchoring element 6 according to the invention according to FIGS. 5a, b corresponds in structure to the two described above, but consists entirely of polyamide.

Polyamid ist wegen seiner hohen mechanischen Festigkeit für die Verwendung in erfindungsgemässen Verankerungselementen besonders geeignet, jedoch ist auch der Einsatz anderer, unter Umständen auch mehrerer verschiedener elektrisch isolierender Materialien möglich.Because of its high mechanical strength, polyamide is particularly suitable for use in the anchoring elements according to the invention, but it is also possible to use other, possibly also several different, electrically insulating materials.

Es wurde bereits darauf hingewiesen, dass es für die erfindungsgemässe Funktion des Verankerungselements 6 entscheidend wichtig ist, dass die Durchführungsöffnung 12 so abgedichtet ist, dass keine elektrische Verbindung zwischen den Vergussmassen im Durchführungskanal 13 und ausserhalb des Ankerstutzens 7 besteht. Eine solche Abdichtung kann im Prinzip durch eine im Bereich der Durchführungsöffnung 12 zwischen die Wand des Durchführungskanals 13 und die Aussenseite des Schutzrohrs 4 geklemmte Dichtung erreicht werden oder durch Vergiessen der Durchführungsöffnung 12 mit einer elektrisch isolierenden Masse. Beide Methoden sind jedoch unter den an einer Baustelle herrschenden Bedingungen nicht sehr zuverlässig.It has already been pointed out that it is crucially important for the function of the anchoring element 6 according to the invention that the lead-through opening 12 is sealed in such a way that there is no electrical connection between the casting compounds in the lead-through channel 13 and outside the anchor stub 7. Such a seal can in principle be achieved by a seal clamped in the area of the passage opening 12 between the wall of the passage channel 13 and the outside of the protective tube 4 or by casting the passage opening 12 with an electrically insulating compound. However, both methods are not very reliable under the conditions prevailing at a construction site.

Sehr einfach ist dagegen eine ausreichende Abdichtung mit dem in Fig. 6 dargestellten Verankerungselement 6 zu erreichen. Es weist ein Rohrstück 18 auf, welches mit einem Dichtungsabschnitt 19 in die Durchführungsöffnung 12 bis zu einer einen Anschlag bildenden Schulter 20 eingeschoben ist. Zwischen die Stirnfläche des Rohrstücks 18 und die Schulter 20 ist ein Dichtungsring 21a, z. B. aus Gummi geklemmt, auf den gegen das Ende des Ankerstutzens 7 zu zwei weitere zwischen die Aussenseite des Dichtungsabschnitts 19 und die Innenwand des Durchführungskanals 13 geklemmte Dichtungsringe 21b,c folgen, sodass die Verbindung zwischen dem Rohrstück 18 und dem Ankerstutzen 7 zuverlässig dicht ist. An den Dichtungsabschnitt 19 schliesst eine mit demselben durch Spiegelschweissen verbundene Elektroschweissmuffe 22 an.On the other hand, it is very easy to achieve adequate sealing with the anchoring element 6 shown in FIG. 6. It has a pipe section 18 which is inserted with a sealing section 19 into the through opening 12 up to a shoulder 20 forming a stop is. Between the end face of the pipe section 18 and the shoulder 20 is a sealing ring 21a, for. B. clamped from rubber, on the towards the end of the armature connector 7 to two more between the outside of the sealing portion 19 and the inner wall of the passage channel 13 clamped sealing rings 21b, c follow, so that the connection between the pipe section 18 and the armature connector 7 is reliably tight . An electrical welding sleeve 22 connected to the sealing section 19 is connected to it by mirror welding.

Zur Abdichtung wird die Elektroschweissmuffe 22 mit Strom beschickt und mit der Aussenseite des Schutzrohrs 4 verschmolzen. Während sich die Schweissmuffe 22 leicht zusammenzieht, wird der Dichtungsabschnitt 19 durch das Verschweissen nicht tangiert, sodass die Dichtigkeit seiner Verbindung mit dem Ankerstutzen 7 nicht beeinträchtigt wird.For sealing, the electric welding sleeve 22 is supplied with current and fused to the outside of the protective tube 4. While the welding sleeve 22 contracts slightly, the sealing section 19 is not affected by the welding, so that the tightness of its connection to the anchor connector 7 is not impaired.

Claims (17)

Verankerungselement (6) zur Verankerung eines Bodenankers (1) an einem Bauteil (2), mit einer Verankerungsplatte (9) mit einer Aussenfläche (11) und derselben gegenüberliegend einer Abstützfläche (10) sowie einer Oeffnung (8), welche zusammen mit der Innenfläche mindestens eines Teilabschnitts eines Ankerstutzens (7), der an der Abstützfläche (10) ansetzt und die Oeffnung (8) umgibt, einen Durchführungskanal (13) zur Durchführung des obersten Abschnitts des Bodenankers (1) bildet, der an seinem von der Verankerungsplatte (9) entfernten Ende von einer Durchführungsöffnung (12) zur dichtenden Durchführung des Bodenankers (1) abgeschlossen ist, dadurch gekennzeichnet, dass die Begrenzungsfläche mindestens eines an die Durchführungsöffnung (12) anschliessenden Abschnitts des Durchführungskanals (13) von elektrisch isolierendem Material gebildet wird.Anchoring element (6) for anchoring a floor anchor (1) to a component (2), with an anchoring plate (9) with an outer surface (11) and the same opposite a support surface (10) and an opening (8), which together with the inner surface at least a partial section of an anchor socket (7), which attaches to the support surface (10) and surrounds the opening (8), forms a lead-through channel (13) for the passage of the uppermost section of the floor anchor (1), which is connected to the anchor plate (9 ) distal end of a feed-through opening (12) for sealing passage of the floor anchor (1), characterized in that the boundary surface of at least one section of the feed-through channel (13) adjoining the feed-through opening (12) is formed by electrically insulating material. Verankerungselement (6) nach Anspruch 1, dadurch gekennzeichnet, dass die gesamte Begrenzungsfläche des Durchführungskanals (13) von elektrisch isolierendem Material gebildet wird.Anchoring element (6) according to claim 1, characterized in that the entire boundary surface of the feed-through channel (13) is formed by electrically insulating material. Verankerungselement (6) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass mindestens ein die Oeffnung (8) umgebender Teil der Aussenfläche (11) der Verankerungsplatte (9) von elektrisch isolierendem Material gebildet wird.Anchoring element (6) according to claim 1 or 2, characterized in that at least one part of the outer surface (11) of the anchoring plate (9) surrounding the opening (8) is formed by electrically insulating material. Verankerungselement (6) nach Anspruch 3, dadurch gekennzeichnet, dass seine gesamte Oberfläche von elektrisch isolierendem Material gebildet wird.Anchoring element (6) according to claim 3, characterized in that its entire surface of electrically insulating material is formed. Verankerungselement (6) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Ankerstutzen (7) vollständig aus elektrisch isolierendem Material besteht.Anchoring element (6) according to one of claims 1 to 4, characterized in that the anchor stub (7) consists entirely of electrically insulating material. Verankerungselement (6) nach Anspruch 5, dadurch gekennzeichnet, dass es vollständig aus elektrisch isolierendem Material besteht.Anchoring element (6) according to claim 5, characterized in that it consists entirely of electrically insulating material. Verankerungselement (6) zur Verankerung eines Bodenankers (1) an einem Bauteil (2), mit einer Verankerungsplatte (9) mit einer Aussenfläche (11) und derselben gegenüberliegend einer Abstützfläche (10) sowie einer Oeffnung (8), welche zusammen mit der Innenfläche mindestens eines Teilabschnitts eines Ankerstutzens (7), der an der Abstützfläche (10) ansetzt und die Oeffnung (8) umgibt, einen Durchführungskanal (13) zur Durchführung des obersten Abschnitts des Bodenankers (1) bildet, der an seinem von der Verankerungsplatte (9) entfernten Ende von einer Durchführungsöffnung (12) zur dichtenden Durchführung desselben abgeschlossen ist, dadurch gekennzeichnet, dass mindestens die Abstützfläche (10), die Aussenfläche des Ankerstutzens (7) sowie gegebenenfalls der ausserhalb der Durchführungsöffnung (12) liegende Abschnitt der Innenfläche des Ankerstutzens (7) und Aussen- und Innenfläche verbindende Randflächen von elektrisch isolierendem Material gebildet werden.Anchoring element (6) for anchoring a floor anchor (1) to a component (2), with an anchoring plate (9) with an outer surface (11) and the same opposite a support surface (10) and an opening (8), which together with the inner surface at least a partial section of an anchor socket (7), which attaches to the support surface (10) and surrounds the opening (8), forms a lead-through channel (13) for the passage of the uppermost section of the floor anchor (1), which is connected to the anchor plate (9 ) distal end of a lead-through opening (12) for sealing implementation of the same, characterized in that at least the support surface (10), the outer surface of the anchor connector (7) and, if appropriate, the section of the inner surface of the anchor connector (outside the lead-through opening (12)) 7) and outer and inner surface connecting edge surfaces are formed by electrically insulating material. Verankerungselement (6) nach Anspruch 7, dadurch gekennzeichnet, dass die Aussenfläche (11) der Verankerungsplatte (9) sowie die Aussenfläche (11) und die Abstützfläche (10) verbindende Randflächen (16) von elektrisch isolierendem Material gebildet werden.Anchoring element (6) according to claim 7, characterized in that the outer surface (11) of the anchoring plate (9) and the outer surface (11) and the support surface (10) connecting edge surfaces (16) be formed by electrically insulating material. Verankerungselement (6) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass mindestens ein Teil des elektrisch isolierenden Materials Polyamid ist.Anchoring element (6) according to one of claims 1 to 8, characterized in that at least part of the electrically insulating material is polyamide. Verankerungselement (6) nach Anspruch 3, 4 oder 8, dadurch gekennzeichnet, dass die Verankerungsplatte (9) als beidseitig polyamidbeschichtete Eisen- oder Stahlplatte ausgebildet ist.Anchoring element (6) according to claim 3, 4 or 8, characterized in that the anchoring plate (9) is designed as an iron or steel plate coated with polyamide on both sides. Verankerungselement (6) nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass es ein mit dem Ankerstutzen (7) im wesentlichen koaxiales und mit ihm dichtend verbundenes Rohrstück (18) aufweist, von dem mindestens ein Teilabschnitt als Elektroschweissmuffe (22) ausgebildet ist.Anchoring element (6) according to one of Claims 1 to 10, characterized in that it has a tube piece (18) which is essentially coaxial with the anchor stub (7) and is connected to it in a sealing manner, at least a portion of which is designed as an electrical welding sleeve (22) . Verankerungselement (6) nach Anspruch 11, dadurch gekennzeichnet, dass das Rohrstück (18) und der Ankerstutzen (7) teleskopartig ineinandergeschoben sind und zwischen die Aussenseite des einen und die Innenseite des anderen eine Anzahl von Dichtungsringen (21a, 21b, 21c) geklemmt ist.Anchoring element (6) according to claim 11, characterized in that the pipe section (18) and the anchor socket (7) are telescopically pushed into one another and a number of sealing rings (21a, 21b, 21c) is clamped between the outside of one and the inside of the other . Verankerungselement (6) nach Anspruch 12, dadurch gekennzeichnet, dass die Anzahl der Dichtungsringe (21a, 21b, 21c) mindestens zwei beträgt.Anchoring element (6) according to claim 12, characterized in that the number of sealing rings (21a, 21b, 21c) is at least two. Verankerungselement (6) nach Anspruch 12 oder 13, dadurch gekennzeichnet, dass das Rohrstück (18) einen Dichtungsabschnitt (19), welcher die Dichtungsringe (21a, 21b, 21c) kontaktiert, umfasst, an welchen die Elektroschweissmuffe (22) axial anschliesst.Anchoring element (6) according to claim 12 or 13, characterized in that the pipe section (18) comprises a sealing section (19) which contacts the sealing rings (21a, 21b, 21c), to which the electrical welding sleeve (22) adjoins axially. Verankerungselement (6) nach einem der Ansprüche 12 bis 14, dadurch gekennzeichnet, dass das Rohrstück (18) in den Durchführungskanal (13) eingeschoben ist.Anchoring element (6) according to one of claims 12 to 14, characterized in that the pipe section (18) is inserted into the passage channel (13). Verankerungselement (6) nach Anspruch 15, dadurch gekennzeichnet, dass im Durchführungskanal (13) eine Schulter (20) vorhanden ist, welche einen Anschlag für das Rohrstück (18) bildet.Anchoring element (6) according to claim 15, characterized in that a shoulder (20) is present in the lead-through channel (13), which forms a stop for the pipe section (18). Verankerungselement (6) nach Anspruch 16, dadurch gekennzeichnet, dass zwischen die Stirnfläche des Rohrstücks (18) und die Schulter (20) ein Dichtungsring (21a) geklemmt ist.Anchoring element (6) according to claim 16, characterized in that a sealing ring (21a) is clamped between the end face of the tube piece (18) and the shoulder (20).
EP92110901A 1991-07-10 1992-06-27 Anchoring element Expired - Lifetime EP0522384B1 (en)

Applications Claiming Priority (2)

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CH2059/91 1991-07-10
CH2059/91A CH683850A5 (en) 1991-07-10 1991-07-10 Anchoring element.

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AT (1) ATE113680T1 (en)
AU (1) AU2017892A (en)
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DE (1) DE59200721D1 (en)
DK (1) DK0522384T3 (en)
ES (1) ES2063553T3 (en)
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AT16709U1 (en) * 2018-03-01 2020-07-15 Gmk System Ag Retaining wall element and retaining wall made of retaining wall elements
CN111908882A (en) * 2020-08-12 2020-11-10 广州建设工程质量安全检测中心有限公司 Reinforcing fiber anti-crack reinforcing steel bar sleeve grouting material and preparation method thereof
CN112228130A (en) * 2020-09-01 2021-01-15 中铁十局集团城市轨道交通工程有限公司 Construction method for pulling out anchor cable intruding into shield zone range of urban subway

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DE9416718U1 (en) * 1994-10-18 1994-12-15 Bilfinger + Berger Bauaktiengesellschaft, 68165 Mannheim Countersunk, sealed anchor bushing, especially for diaphragm walls
AT16709U1 (en) * 2018-03-01 2020-07-15 Gmk System Ag Retaining wall element and retaining wall made of retaining wall elements
CN111908882A (en) * 2020-08-12 2020-11-10 广州建设工程质量安全检测中心有限公司 Reinforcing fiber anti-crack reinforcing steel bar sleeve grouting material and preparation method thereof
CN112228130A (en) * 2020-09-01 2021-01-15 中铁十局集团城市轨道交通工程有限公司 Construction method for pulling out anchor cable intruding into shield zone range of urban subway

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EP0522384B1 (en) 1994-11-02
CH683850A5 (en) 1994-05-31
ZA925009B (en) 1993-04-28
DE59200721D1 (en) 1994-12-08
DK0522384T3 (en) 1995-04-18
ES2063553T3 (en) 1995-01-01
ATE113680T1 (en) 1994-11-15
AU2017892A (en) 1993-02-11
WO1993001361A1 (en) 1993-01-21
US5423635A (en) 1995-06-13

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