EP3321423A1 - Anchor arrangement in the ground, ground anchor and procedure for anchoring. - Google Patents
Anchor arrangement in the ground, ground anchor and procedure for anchoring. Download PDFInfo
- Publication number
- EP3321423A1 EP3321423A1 EP16198175.8A EP16198175A EP3321423A1 EP 3321423 A1 EP3321423 A1 EP 3321423A1 EP 16198175 A EP16198175 A EP 16198175A EP 3321423 A1 EP3321423 A1 EP 3321423A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- anchor
- tension element
- ground
- anchoring
- anchor body
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 13
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- 238000004090 dissolution Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 29
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000004952 Polyamide Substances 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- 229920006097 Ultramide® Polymers 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 229920006877 PA6-I Polymers 0.000 description 2
- 229920003826 Ultramid® B3L Polymers 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- 238000011161 development Methods 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 2
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- 239000000243 solution Substances 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 239000011440 grout Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
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Images
Classifications
-
- 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
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
Definitions
- the invention relates to an anchor assembly in the ground with a ground anchor with an elongated tension element which is introduced into a bore in the ground, wherein the anchor element is connected to the tie element at a bottom anchoring portion, which has a larger outer diameter than the tension element, and the ground anchor a heating device for releasing the tension element, according to the preamble of claim 1.
- the invention further relates to a ground anchor for such an anchor arrangement, with an elongated tension element, to which an anchor body can be fixedly connected to a base-side anchoring section, according to the preamble of claim 7.
- the invention relates to a method for anchoring a ground anchor in the ground, in which a hole is created in the ground, the ground anchor is at least partially introduced into the bore and then an anchor body is formed on a bottom anchoring portion of an elongated tension element of the ground anchor, according to the preamble of claim 8.
- Anchor assemblies with ground anchors are used, for example, in a back anchoring of excavation pit walls in the upcoming soil. By anchoring arrangement so that pending on a pit wall pressure forces can be dissipated in the rear floor.
- a hole is first created through the excavation support wall in the rear floor.
- the hole can be a length of up to 10 m and more.
- a ground anchor is introduced with an elongated tension element made of a steel material.
- an anchoring body is created by introducing a settable mass in the ground, which is firmly connected after setting with the tension element and the ground.
- After curing of the anchoring body can be placed on a free head element of the ground anchor a tendon, in particular screwed.
- the clamping element is applied to the excavation support wall and can thus initiate pending pressure forces on the tension element in the rear floor.
- ground anchors it is desired to dismantle the ground anchors, for example when closing the excavation pit. This may be necessary for reasons of environmental protection, for example, if as few residues as possible should remain in the soil after completion of the construction work, or if the anchorages represent obstacles in the adjoining land. Furthermore, a recovery of at least parts of the ground anchor and resource-saving.
- At least partially expandable ground anchors are known, which are also called expansion anchor. That's how it describes EP 0 583 725 A1 a ground anchor with a tension element, which is at least partially formed of a special ferromagnetic material.
- the tension element can be heated beyond the Curie temperature of the steel material in a certain section, so that the strength of the tension element in the separation section is reduced.
- the tension element is separated in the separation section. The separated part of the tension element can thus be removed from the ground.
- tension elements of ground anchors with mechanical separating elements, such as threaded portions.
- mechanical separating sections are expensive to produce and lead to increased costs.
- releasable threaded portions often represent a limitation of the maximum applied tensile load.
- the invention has for its object to provide an anchor assembly, a ground anchor and a method for anchoring, with which anchoring is possible in a simple and efficient manner, while maintaining the possibility of easy release.
- connection with the tension element is formed with a connection material which firmly connects the tension element to the anchor body at ambient temperature, the connection being releasable at a predetermined solution temperature which differs from the ambient temperature.
- a basic idea of the invention is to provide a special connecting material between the anchor body and the tension element which considerably reduces its strength at a prescribed dissolution temperature and thus allows the tension element to be released from the anchor body.
- the connecting material thus represents an intermediate element between the anchor body, which remains in the ground, and the elongated metallic tension element. In a complete release of the tension element this can later again for another armature arrangement are used, which significantly reduces the cost of materials and thus the cost of anchoring.
- Plastics can become brittle at low temperatures below 0 ° C and lose their strength.
- Another advantage of the invention is that conventional tension members and ground anchors can be used without these themselves being constructed of special materials or steels.
- the bonding material comprises a plastic material and / or a metallic material which melts or decomposes at the dissolution temperature.
- any suitably suitable plastic material can be used for this purpose, which ensures a firm connection between the metallic tension element and the anchoring body at ambient temperatures, which is usually formed from a concrete material.
- a metal such as tin, or a metallic alloy may be provided. It may also be appropriate to use a mixture of plastic and a metallic material.
- the connecting material is a polyamide, in particular PA6-I Ultramid B3L.
- Polyamide is a polymer that allows a good bond between different materials. Also provides polyamide at ambient conditions, ie at a temperature of 23 ° C high strength. Increasing the temperature to about 200 ° C decreases the strength many times over. Polyamide melts in a temperature range above approx. 270 ° C and can decompose at even higher temperatures.
- a particularly preferred choice of material consists in the plastic PA6-I Ultramid B3L, which can be obtained from BASF AG. Ultramid is a registered trademark of BASF AG. This material has a yield strength of 70 MPa at 23 ° C.
- the connecting material is formed as a sleeve, which at least on the bottom side Anchoring portion of the tension element is firmly applied.
- the application can be done in any way, such as by casting or in a mechanical manner by pressing.
- the attachment of a sleeve-shaped connecting material can be additionally supported by means of mechanical stops or form elements on the tension element and / or on the anchoring body and / or the sleeve body.
- the heating device is particularly preferred for the heating device to be provided at least in the bottom-side anchoring section of the tension element. This allows a targeted heating of the anchoring portion, if a release is desired.
- the heating device can be designed in any way.
- a particularly efficient embodiment is achieved according to a preferred embodiment of the invention in that the heating device is designed as an electric heater.
- the heating device can have a heating coil in the region of the anchoring section.
- a particularly simple embodiment can be achieved in that the metallic tension element is used as a whole as an electrical resistance element for generating electrical heating heat.
- an electrical forward or return line can be provided in an interior of the tubular tension element.
- a voltage can be applied between two end regions of the tension element, so that at least in sections a current flows through the tension element. This flowing current leads to a corresponding heat generation due to the electrical resistance of the tension element.
- the tension member may be a tie rod or a pull cord of a steel material. It is also possible to provide an inductive heating device with an induction coil, which has a metallic heating element inductively.
- the heating element may be embedded in the connecting material.
- the ground anchor according to the invention is characterized in that at least at the bottom anchoring portion for anchoring with the anchor body, a connecting material is attached, which connects the tension member fixed to the anchor body at ambient temperature and the connection to the anchor body at a predetermined Lieretemperaturlösbar, which is independent of the ambient temperature different.
- the ground anchor is provided in particular for the anchor arrangement described above. With the ground anchor according to the invention in particular the advantages described above can be achieved.
- the ground anchor can also be referred to as expansion anchor.
- the ground anchor may preferably be formed as a grout anchor or a so-called Gewi anchor.
- the invention is characterized in that at least at the bottom anchoring portion of the tension element, a connecting material is attached, which connects the tension element firmly to the anchor body at ambient temperature, that at least the bottom-side anchoring portion is brought to a dissolution temperature to remove the tension element from the ground, in which the connection to the anchor body dissolves, and that the tension element is pulled out of the ground.
- the hole can be made with a separate drilling tool or through the ground anchor itself.
- a release of the tension element from the anchor body is understood to mean the achievement of a significantly reduced strength of the connection material between the anchor body and the tension element, so that the tension element can be pulled out of the anchor body and the ground with a defined release force.
- a preferred method variant of the invention is that the anchor body is introduced by introducing a hardenable anchoring mass via a feed line along the tension element in the ground, wherein the hardenable mass hardens to the anchor body.
- the method can basically be carried out as previously known anchoring methods.
- the connection material is applied in any desired manner, preferably in a sleeve shape, at least at the base-side anchoring section. After introduction of the tension element prepared in this way into the ground, the flowable anchoring mass in the region of the ground-side anchoring section on the tension element is introduced via a feed line.
- the anchoring mass can penetrate into deeper, radially spaced from the tension element bottom portions, so that a relatively large anchoring body is formed in the ground.
- the hardenable Mass may in particular be a concrete mass or some other mass with a cement paste.
- the heating of the anchoring portion of the tension element can take place in any desired manner. Heating could be formed via a burner or by chemically generating the heat energy. According to a development of the invention, it is particularly efficient that the heating of the at least bottom-anchoring section of the tension element takes place by means of an electrical heating device. At the free end of the tension element corresponding connections can be provided for an electrical energy source. Preferably, the electrical heating device is formed directly by the tension element and / or provided only on the anchoring portion of the tension element.
- Fig. 1 is in a hole 7 in the bottom 5, a rod-shaped ground anchor 20 is introduced.
- the bore 7 can be created by a separate drilling tool or directly by the ground anchor 20 when introduced into the ground 5.
- the ground anchor 20 has a rod-shaped, elongate tension element 22, on whose bottom-side end region an anchoring portion 24 is arranged.
- a sleeve 18 is formed from a connecting material 16.
- the connecting material 16 is a in the present embodiment special polymer, especially Ultramid.
- the sleeve 18 constitutes a connecting element which connects the tension element 22 with an outer annular anchoring body 12.
- the anchoring body 12 is formed by introducing or injecting a hardenable mass from a surface 6 of the bottom 5 along the tension member 22 via a feed line.
- a flowable concrete suspension which hardens after injection into the anchor body 12 can be used as an anchoring mass.
- the anchor body 12 is connected via the sleeve 18 fixed to the anchoring portion 24 of the tension member 22 in normal environmental conditions.
- the ambient temperature in the exemplary embodiment is 23 ° C., the strength values in principle also applying to temperatures up to 0 ° C. and below.
- a tensioning member 26 can be applied approximately via a threaded connection.
- the tendon 26 can thus act on the surface 6 of the bottom 5 acting compressive forces, such as those caused on excavation walls, and derive via the tension element 22 and the anchor body 12 in the rear regions of the bottom 5.
- the tension member 22 may have a length of several meters, in particular up to 15 m and longer.
- the ground anchor 20 can easily be pulled out of the ground 5, as in FIG Fig. 2 is shown.
- the tension element 22 of the ground anchor 20 is heated at least in the region of the anchoring portion 24 via a heater, not shown, from the ambient temperature to a dissolution temperature of for example 220 ° C.
- the heating device may be an electric heating coil or the metallic tension element 22 itself, electrical energy being supplied from a surface 6 of the base 5 via lead connections (not shown).
- the strength of the bonding material 16 decreases considerably, to about 10% of the original strength at ambient temperature.
- the sleeve 18 is destroyed from the polymer or bonding material 16.
- Connecting material 16 may remain both on an inner side of the annular anchor body 12 and on an outer side of the tension element 22. The tension element 22 released by the anchor body 12 can thus be pulled out of the ground 5 relatively easily.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Die Erfindung betrifft eine Ankeranordnung im Boden, mit einem Bodenanker mit einem länglichen Zugelement, welches in eine Bohrung in dem Boden eingebracht ist, wobei mit dem Zugelement an einem bodenseitigen Verankerungsabschnitt ein Ankerkörper verbunden ist, welcher einen größeren Außendurchmesser als das Zugelement aufweist, und der Bodenanker eine Heizeinrichtung zum Lösen des Zugelements umfasst. Ein besonders effizientes Lösen des Zugelementes wird dadurch erreicht, dass die Verbindung mit dem Zugelement mit einem Verbindungsmaterial gebildet ist, welches bei Umgebungstemperatur das Zugelement fest mit dem Ankerkörper verbindet, wobei die Verbindung bei einer vorgegebenen Lösetemperatur lösbar ist. Die Erfindung umfasst weiterhin einen hierfür vorgesehen Bodenanker sowie ein Verfahren zum Verankern.
Description
Die Erfindung betrifft eine Ankeranordnung im Boden mit einem Bodenanker mit einem länglichen Zugelement, welches in eine Bohrung in dem Boden eingebracht ist, wobei mit dem Zugelement an einem bodenseitigen Verankerungsabschnitt ein Ankerkörper verbunden ist, welcher einen größeren Außendurchmesser als das Zugelement aufweist, und der Bodenanker eine Heizeinrichtung zum Lösen des Zugelements umfasst, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an anchor assembly in the ground with a ground anchor with an elongated tension element which is introduced into a bore in the ground, wherein the anchor element is connected to the tie element at a bottom anchoring portion, which has a larger outer diameter than the tension element, and the ground anchor a heating device for releasing the tension element, according to the preamble of claim 1.
Die Erfindung betrifft weiterhin einen Bodenanker für eine solche Ankeranordnung, mit einem länglichen Zugelement, an welchen an einem bodenseitigen Verankerungsabschnitt ein Ankerkörper fest verbindbar ist, gemäß dem Oberbegriff des Anspruchs 7.The invention further relates to a ground anchor for such an anchor arrangement, with an elongated tension element, to which an anchor body can be fixedly connected to a base-side anchoring section, according to the preamble of
Des Weiteren betrifft die Erfindung ein Verfahren zum Verankern eines Bodenankers im Boden, bei dem eine Bohrung in dem Boden erstellt wird, der Bodenanker zumindest teilweise in die Bohrung eingebracht wird und anschließend ein Ankerkörper an einem bodenseitigen Verankerungsabschnitt eines länglichen Zugelementes des Bodenankers ausgebildet wird, gemäß dem Oberbegriff des Anspruchs 8.Furthermore, the invention relates to a method for anchoring a ground anchor in the ground, in which a hole is created in the ground, the ground anchor is at least partially introduced into the bore and then an anchor body is formed on a bottom anchoring portion of an elongated tension element of the ground anchor, according to the preamble of claim 8.
Ankeranordnungen mit Bodenankern werden beispielsweise bei einer Rückverankerung von Baugrubenwänden im anstehenden Boden verwendet. Durch die Ankeranordnung können so die auf eine Baugrubenwand anstehenden Druckkräfte in den rückwärtigen Boden abgeleitet werden.Anchor assemblies with ground anchors are used, for example, in a back anchoring of excavation pit walls in the upcoming soil. By anchoring arrangement so that pending on a pit wall pressure forces can be dissipated in the rear floor.
Zum Ausbilden einer Ankeranordnung wird zunächst eine Bohrung durch die Baugrubenstützwand in den rückwärtigen Boden erstellt. Die Bohrung kann eine Länge von bis zu 10 m und mehr aufweisen. In die Bohrung wird ein Bodenanker mit einem länglichen Zugelement aus einem Stahlmaterial eingebracht. An einem bodenseitigen Verankerungsabschnitt des Zugelementes wird durch Einbringen einer abbindbaren Masse im Boden ein Verankerungskörper erstellt, welcher nach dem Abbinden fest mit dem Zugelement und dem Boden verbunden ist. Nach Aushärten des Verankerungskörpers kann an einem freien Kopfelement des Bodenankers ein Spannglied aufgesetzt, insbesondere aufgeschraubt werden. Das Spannelement liegt an der Baugrubenstützwand an und kann so anstehende Druckkräfte über das Zugelement in den rückwärtigen Boden einleiten.To form an anchor arrangement, a hole is first created through the excavation support wall in the rear floor. The hole can be a length of up to 10 m and more. In the hole a ground anchor is introduced with an elongated tension element made of a steel material. At a bottom anchoring portion of the tension element an anchoring body is created by introducing a settable mass in the ground, which is firmly connected after setting with the tension element and the ground. After curing of the anchoring body can be placed on a free head element of the ground anchor a tendon, in particular screwed. The clamping element is applied to the excavation support wall and can thus initiate pending pressure forces on the tension element in the rear floor.
In bestimmten Fällen ist es gewünscht, etwa beim Schließen der Baugrube, die Bodenanker rückzubauen. Dies kann etwa aus Umweltschutzgründen geboten sein, wenn möglichst wenige Rückstände nach Abschluss der Bauarbeiten in Boden verbleiben sollen, oder wenn die Verankerungen Hindernisse in den angrenzenden Grundstücken darstellen. Weiterhin ist eine Rückgewinnung zumindest von Teilen des Bodenankers auch ressourcenschonend.In certain cases, it is desired to dismantle the ground anchors, for example when closing the excavation pit. This may be necessary for reasons of environmental protection, for example, if as few residues as possible should remain in the soil after completion of the construction work, or if the anchorages represent obstacles in the adjoining land. Furthermore, a recovery of at least parts of the ground anchor and resource-saving.
Im Stand der Technik sind zumindest teilweise ausbaufähige Bodenanker bekannt, welche auch Ausbauanker genannt werden. So beschreibt die
Ein derartiger gattungsgemäßer Bodenanker ist aufgrund der Verwendung besonderer Stähle kostenaufwändig in der Herstellung. Zudem wird das Zugelement beim Lösen zerteilt und damit teilweise zerstört. Es verbleibt ein metallischer Abschnitt weiterhin im Boden. Des Weiteren sind zum Erhitzen von Metall auf eine Curietemperatur ganz erhebliche Temperaturen von bis zu 1000°C und mehr notwendig, was eine entsprechend hohe Energieaufbringung bedingt. Die Bereitstellung einer entsprechend hohen Strommenge an einer Baustelle ist oftmals schwierig und auch unter dem Gesichtspunkt der Arbeitssicherheit problematisch.Such a generic ground anchor is costly to manufacture due to the use of special steels. In addition, the tension element is split when loosening and thus partially destroyed. It remains a metallic section remains in the ground. Furthermore, for the heating of metal to a Curie temperature quite considerable temperatures of up to 1000 ° C and more are necessary, which requires a correspondingly high energy application. The provision of a correspondingly high amount of electricity at a construction site is often difficult and also problematic from the point of view of occupational safety.
Ähnliche Ausbauanker mit einer Heizeinrichtung zur Festigkeitsreduzierung eines speziellen metallischen Abschnitts des Zugelementes gehen auch aus der
Weiterhin ist es bekannt, Zugelemente von Bodenankern mit mechanischen Trennelementen, etwa mit Gewindeabschnitten zu versehen. Derartige mechanische Trennabschnitte sind jedoch fertigungstechnisch aufwändig und führen zu erhöhten Kosten. Zudem stellen etwa lösbare Gewindeabschnitte häufig eine Begrenzung der maximal aufbringbaren Zugbelastung dar.Furthermore, it is known to provide tension elements of ground anchors with mechanical separating elements, such as threaded portions. However, such mechanical separating sections are expensive to produce and lead to increased costs. In addition, releasable threaded portions often represent a limitation of the maximum applied tensile load.
Der Erfindung liegt die Aufgabe zugrunde, eine Ankeranordnung, einen Bodenanker sowie ein Verfahren zum Verankern anzugeben, mit welchen in einer einfachen und effizienten Weise ein Verankern möglich ist, wobei gleichzeitig die Möglichkeit zu einem einfachen Lösen gewahrt wird.The invention has for its object to provide an anchor assembly, a ground anchor and a method for anchoring, with which anchoring is possible in a simple and efficient manner, while maintaining the possibility of easy release.
Die Aufgabe wird nach der Erfindung durch eine Ankeranordnung mit den Merkmalen des Anspruchs 1, einen Bodenanker mit den Merkmalen des Anspruchs 7 beziehungsweise ein Verfahren mit den Merkmalen des Anspruchs 8 gelöst. Bevorzugte Ausführungsformen sind in den abhängigen Ansprüchen angegeben.The object is achieved according to the invention by an anchor assembly having the features of claim 1, a ground anchor with the features of
Die erfindungsgemäße Ankeranordnung ist dadurch gekennzeichnet, dass die Verbindung mit dem Zugelement mit einem Verbindungsmaterial gebildet ist, welches bei Umgebungstemperatur das Zugelement fest mit dem Ankerkörper verbindet, wobei die Verbindung bei einer vorgegebenen Lösetemperatur die lösbar ist, welche sich von der Umgebungstemperatur unterscheidet.The armature arrangement according to the invention is characterized in that the connection with the tension element is formed with a connection material which firmly connects the tension element to the anchor body at ambient temperature, the connection being releasable at a predetermined solution temperature which differs from the ambient temperature.
Eine Grundidee der Erfindung besteht darin, zwischen dem Ankerkörper und dem Zugelement ein spezielles Verbindungsmaterial vorzusehen, welches bei einer vorgesehenen Lösetemperatur seine Festigkeit erheblich reduziert und so das Zugelement vom Ankerkörper gelöst werden kann. Somit ist es grundsätzlich möglich, das Zugelement insgesamt vom Ankerkörper zu trennen, so dass dieses vorzugsweise rückstandsfrei aus dem Boden mit einer vorgesehenen Lösekraft entfernt werden kann. Das Verbindungsmaterial stellt somit ein Zwischenelement zwischen dem Ankerkörper, welcher im Boden verbleibt, und dem länglichen metallischen Zugelement dar. Bei einem vollständigen Lösen des Zugelementes kann dieses später wieder für eine andere Ankeranordnung eingesetzt werden, was den Materialaufwand und damit die Kosten für eine Verankerung erheblich reduziert.A basic idea of the invention is to provide a special connecting material between the anchor body and the tension element which considerably reduces its strength at a prescribed dissolution temperature and thus allows the tension element to be released from the anchor body. Thus, it is basically possible to separate the tension element as a whole from the anchor body, so that it can be preferably removed without residue from the ground with a designated release force. The connecting material thus represents an intermediate element between the anchor body, which remains in the ground, and the elongated metallic tension element. In a complete release of the tension element this can later again for another armature arrangement are used, which significantly reduces the cost of materials and thus the cost of anchoring.
Ein Temperaturunterschied zwischen der Umgebungstemperatur und der Lösetemperatur sollte vorzugsweise mindestens 100°C oder mehr betragen. Vorzugsweise wird die Lösetemperatur durch Erhitzen erzielt. Es ist grundsätzlich auch möglich, eine kältere Lösetemperatur vorzusehen, welche unterhalb der Umgebungstemperatur liegt. In diesem Fall ist die Heizeinrichtung als eine Kühleinrichtung zu verstehen, mit welcher ein Kühlmedium zugeführt wird.A temperature difference between the ambient temperature and the dissolving temperature should preferably be at least 100 ° C or more. Preferably, the dissolution temperature is achieved by heating. It is also possible in principle to provide a colder solution temperature which is below the ambient temperature. In this case, the heating device is to be understood as a cooling device, with which a cooling medium is supplied.
Kunststoffe können bei niedrigen Temperaturen unter 0°C verspröden und so ihre Festigkeit verlieren.Plastics can become brittle at low temperatures below 0 ° C and lose their strength.
Ein weiterer Vorteil der Erfindung besteht darin, dass herkömmliche Zugelemente und Bodenanker verwendet werden können, ohne dass diese selbst aus speziellen Materialien oder Stählen aufgebaut sein müssen.Another advantage of the invention is that conventional tension members and ground anchors can be used without these themselves being constructed of special materials or steels.
Eine bevorzugte Ausführungsform der Erfindung besteht darin, dass das Verbindungsmaterial ein Kunststoffmaterial und/oder ein metallisches Material aufweist, welches bei der Lösetemperatur schmilzt oder sich zersetzt. Grundsätzlich kann hierzu jedes entsprechend geeignete Kunststoffmaterial verwendet werden, welches bei Umgebungstemperaturen eine feste Verbindung zwischen dem metallischen Zugelement und dem Verankerungskörper sicherstellt, welche üblicherweise aus einem Betonmaterial gebildet ist. Auch ein Metall, etwa Zinn, oder eine metallische Legierung kann vorgesehen sein. Es kann auch eine Mischung aus Kunststoff und einem metallischen Material zweckmäßig sein.A preferred embodiment of the invention is that the bonding material comprises a plastic material and / or a metallic material which melts or decomposes at the dissolution temperature. In principle, any suitably suitable plastic material can be used for this purpose, which ensures a firm connection between the metallic tension element and the anchoring body at ambient temperatures, which is usually formed from a concrete material. Also, a metal, such as tin, or a metallic alloy may be provided. It may also be appropriate to use a mixture of plastic and a metallic material.
Eine besonders bevorzugte Materialauswahl besteht nach einer Ausführungsform der Erfindung darin, dass das Verbindungsmaterial ein Polyamid, insbesondere PA6-I Ultramid B3L ist. Polyamid ist ein Polymer, welches eine gute Verbindung zwischen unterschiedlichen Werkstoffen erlaubt. Auch gewährt Polyamid bei Umgebungsbedingungen, also bei einer Temperatur von 23°C eine hohe Festigkeit. Bei einer Erhöhung der Temperatur auf etwa 200°C nimmt die Festigkeit um ein Vielfaches ab. In einem Temperaturbereich ab ca. 270°C schmilzt Polyamid und kann sich bei noch höheren Temperaturen zersetzen.A particularly preferred choice of material according to one embodiment of the invention is that the connecting material is a polyamide, in particular PA6-I Ultramid B3L. Polyamide is a polymer that allows a good bond between different materials. Also provides polyamide at ambient conditions, ie at a temperature of 23 ° C high strength. Increasing the temperature to about 200 ° C decreases the strength many times over. Polyamide melts in a temperature range above approx. 270 ° C and can decompose at even higher temperatures.
Eine besonders bevorzugte Materialauswahl besteht in dem Kunststoff PA6-I Ultramid B3L, welcher von der BASF AG bezogen werden kann. Ultramid ist dabei eine eingetragene Marke der BASF AG. Dieses Material hat bei 23°C eine Streckfestigkeit von 70 MPa. Nach Versuchen an einem zylindrischen Zugelement mit einem Außendurchmesser von 1,5 cm bei einer hülsenförmigen Anordnung des Kunststoffmaterials um das Zugelement mit einer Wanddicke von 1 cm und einer Anbringungslänge von 10 cm wird die Übertragung von Haltekräften von über 98100 N, also einer Last von etwa 10 t ermöglicht. Bei einer entsprechenden Erhöhung der Verbindungslänge der Kunststoffhülse zum Zugelement können auch noch größere Zug- und Haltekräfte bei einer Umgebungstemperatur von 23°C aufgenommen werden.A particularly preferred choice of material consists in the plastic PA6-I Ultramid B3L, which can be obtained from BASF AG. Ultramid is a registered trademark of BASF AG. This material has a yield strength of 70 MPa at 23 ° C. After experiments on a cylindrical tension element with an outer diameter of 1.5 cm with a sleeve-shaped arrangement of the plastic material to the tension element with a wall thickness of 1 cm and a mounting length of 10 cm, the transfer of holding forces of about 98100 N, ie a load of about 10 tons allowed. With a corresponding increase in the connection length of the plastic sleeve to the tension element even greater tensile and holding forces can be absorbed at an ambient temperature of 23 ° C.
Eine Temperaturerhöhung dieses Polymermaterials auf 220°C führt zu einer Absenkung der Streckfestigkeit auf 5 MPa, also zu einem Absinken auf weniger als 10% der Ursprungsfestigkeit. Bei dem durchgeführten Probekörper mit 10 cm Länge und 1 cm Wanddicke an einem Zugelement mit einem Außendurchmesser von 1,5 cm ist Zugkraft auf 7181,7 N begrenzt. Bei Überschreiten dieser Kraft kann so das metallische Zugelement von dem Ankerkörper gelöst werden.An increase in temperature of this polymer material to 220 ° C leads to a lowering of the yield strength to 5 MPa, ie to a drop to less than 10% of the original strength. Tensile force is limited to 7181.7 N in the test piece of 10 cm in length and 1 cm in wall thickness on a tensile member having an outer diameter of 1.5 cm. When this force is exceeded, the metallic tension element can thus be released from the anchor body.
Bei einer weiteren Erhöhung der Temperatur ist sogar eine weitere Absenkung der Lösekraft möglich.With a further increase in the temperature even a further reduction in the release force is possible.
Besonders vorteilhaft ist es dabei, dass eine Aufheizung eines derartigen Körpers aus diesem Kunststoffmaterial selbst bei einer begrenzten Heizleistung von 2000 W relativ schnell erreicht werden könnte. So kann ein Erreichen der Lösetemperatur innerhalb von unter 10 s bewirkt werden. Auch bei stark Wärme ableitenden Bodenverhältnissen, etwa bei anstehendem Wasser, können Aufheizzeiten von deutlich unter 1 Min. erreicht werden, bis ein Lösen bei der gewünschten geringen Lösekraft ermöglicht wird.It is particularly advantageous that a heating of such a body of this plastic material could be achieved relatively quickly even with a limited heat output of 2000 W. Thus, a reaching of the dissolution temperature can be effected within less than 10 s. Even with very heat-dissipating soil conditions, such as pending water, heating times of well below 1 min. Can be achieved until a release at the desired low dissolving power is made possible.
Die genannten Werte beziehen sich auf bevorzugte Ausführungsbeispiele. Abhängig vom Anwendungsfall und den verwendeten Materialien können sich Abweichungen ergeben.The values mentioned relate to preferred embodiments. Depending on the application and the materials used, deviations may result.
Besonders bevorzugt nach einer Weiterbildung der Erfindung ist es, dass das Verbindungsmaterial als eine Hülse ausgebildet ist, welche zumindest auf den bodenseitigen Verankerungsabschnitt des Zugelementes fest aufgebracht ist. Das Aufbringen kann in beliebiger Weise erfolgen, etwa durch Angießen oder in mechanischer Weise durch Aufpressen. Die Befestigung eines hülsenförmigen Verbindungsmaterials kann dabei zusätzlich mittels mechanischer Anschläge oder Formelemente am Zugelement und/oder am Verankerungskörper und/oder dem Hülsenkörper unterstützt sein.Particularly preferred according to a development of the invention is that the connecting material is formed as a sleeve, which at least on the bottom side Anchoring portion of the tension element is firmly applied. The application can be done in any way, such as by casting or in a mechanical manner by pressing. The attachment of a sleeve-shaped connecting material can be additionally supported by means of mechanical stops or form elements on the tension element and / or on the anchoring body and / or the sleeve body.
Besonders bevorzugt ist es nach einer weiteren Ausführungsvariante der Erfindung, dass zumindest in dem bodenseitigen Verankerungsabschnitt des Zugelementes die Heizeinrichtung vorgesehen ist. Diese erlaubt ein gezieltes Aufheizen des Verankerungsabschnittes, wenn ein Lösen gewünscht ist.According to a further embodiment variant of the invention, it is particularly preferred for the heating device to be provided at least in the bottom-side anchoring section of the tension element. This allows a targeted heating of the anchoring portion, if a release is desired.
Grundsätzlich kann die Heizeinrichtung in einer beliebigen Weise ausgeführt sein. Eine besonders effiziente Ausgestaltung wird nach einer bevorzugten Ausführungsvariante der Erfindung dadurch erreicht, dass die Heizeinrichtung als eine elektrische Heizeinrichtung ausgebildet ist. Die Heizeinrichtung kann dabei im Bereich des Verankerungsabschnitts eine Heizspule aufweisen. Eine besonders einfache Ausbildung kann dadurch erreicht werden, dass das metallische Zugelement insgesamt als ein elektrisches Widerstandselement zum Erzeugen von elektrischer Heizwärme verwendet wird. Hierzu kann in einem Inneren des rohrförmig ausgebildeten Zugelementes eine elektrische Hin- oder Rückleitung vorgesehen sein. Somit kann zwischen zwei Endbereichen des Zugelementes eine Spannung aufgebracht werden, so dass zumindest abschnittsweise durch das Zugelement ein Strom fließt. Dieser fließende Strom führt aufgrund des elektrischen Widerstandes des Zugelementes zu einer entsprechenden Wärmeerzeugung. Das Zugelement kann eine Zugstange oder ein Zugseil aus einem Stahlmaterial sein. Es kann auch eine induktive Heizeinrichtung mit einer Induktionsspule vorgesehen sein, welche ein metallisches Heizelement induktiv aufweist. Das Heizelement kann in dem Verbindungsmaterial eingebettet sein.In principle, the heating device can be designed in any way. A particularly efficient embodiment is achieved according to a preferred embodiment of the invention in that the heating device is designed as an electric heater. The heating device can have a heating coil in the region of the anchoring section. A particularly simple embodiment can be achieved in that the metallic tension element is used as a whole as an electrical resistance element for generating electrical heating heat. For this purpose, an electrical forward or return line can be provided in an interior of the tubular tension element. Thus, a voltage can be applied between two end regions of the tension element, so that at least in sections a current flows through the tension element. This flowing current leads to a corresponding heat generation due to the electrical resistance of the tension element. The tension member may be a tie rod or a pull cord of a steel material. It is also possible to provide an inductive heating device with an induction coil, which has a metallic heating element inductively. The heating element may be embedded in the connecting material.
Der erfindungsgemäße Bodenanker ist dadurch gekennzeichnet, dass zumindest an dem bodenseitigen Verankerungsabschnitt zum Verankern mit dem Ankerkörper ein Verbindungsmaterial angebracht ist, welches bei Umgebungstemperatur das Zugelement fest mit dem Ankerkörper verbindet und die Verbindung zum Ankerkörper bei einer vorgegebenen Lösetemperaturlösbar ist, welche sich von der Umgebungstemperatur unterscheidet. Der Bodenanker ist insbesondere für die zuvor beschriebene Ankeranordnung vorgesehen. Mit dem erfindungsgemäßen Bodenanker können insbesondere die zuvor beschriebenen Vorteile erzielt werden. Der Bodenanker kann auch als Ausbauanker bezeichnet werden. Der Bodenanker kann vorzugsweise als ein Verpressanker oder ein sogenannter Gewi-Anker ausgebildet sein.The ground anchor according to the invention is characterized in that at least at the bottom anchoring portion for anchoring with the anchor body, a connecting material is attached, which connects the tension member fixed to the anchor body at ambient temperature and the connection to the anchor body at a predetermined Lösetemperaturlösbar, which is independent of the ambient temperature different. The ground anchor is provided in particular for the anchor arrangement described above. With the ground anchor according to the invention in particular the advantages described above can be achieved. The ground anchor can also be referred to as expansion anchor. The ground anchor may preferably be formed as a grout anchor or a so-called Gewi anchor.
Hinsichtlich des Verfahrens ist die Erfindung dadurch gekennzeichnet, dass zumindest an dem bodenseitigen Verankerungsabschnitt des Zugelementes ein Verbindungsmaterial angebracht wird, welches bei Umgebungstemperatur das Zugelement fest mit dem Ankerkörper verbindet, dass zum Entfernen des Zugelementes aus dem Boden zumindest der bodenseitige Verankerungsabschnitt auf eine Lösetemperaturgebracht wird, bei welcher sich die Verbindung zum Ankerkörper löst, und dass das Zugelement aus dem Boden gezogen wird. Die Bohrung kann mit einem separaten Bohrwerkzeug oder durch den Bodenanker selbst erstellt werden.With regard to the method, the invention is characterized in that at least at the bottom anchoring portion of the tension element, a connecting material is attached, which connects the tension element firmly to the anchor body at ambient temperature, that at least the bottom-side anchoring portion is brought to a dissolution temperature to remove the tension element from the ground, in which the connection to the anchor body dissolves, and that the tension element is pulled out of the ground. The hole can be made with a separate drilling tool or through the ground anchor itself.
Das erfindungsgemäße Verfahren ist insbesondere mit dem zuvor beschriebenen Bodenanker und der zuvor beschriebenen Ankeranordnung durchführbar. Im Sinne der Erfindung ist unter einem Lösen des Zugelementes vom Ankerkörper das Erreichen einer erheblich reduzierten Festigkeit des Verbindungsmaterials zwischen dem Ankerkörper und dem Zugelement zu verstehen, so dass das Zugelement mit einer definierten Lösekraft aus dem Ankerkörper und dem Boden gezogen werden kann.The inventive method can be carried out in particular with the previously described ground anchor and the armature arrangement described above. For the purposes of the invention, a release of the tension element from the anchor body is understood to mean the achievement of a significantly reduced strength of the connection material between the anchor body and the tension element, so that the tension element can be pulled out of the anchor body and the ground with a defined release force.
Eine bevorzugte Verfahrensvariante der Erfindung besteht darin, dass der Ankerkörper durch Einbringen einer aushärtbaren Verankerungsmasse über eine Zuführleitung entlang des Zugelementes in den Boden eingebracht wird, wobei die aushärtbare Masse zu dem Ankerkörper aushärtet. Dabei kann das Verfahren grundsätzlich wie bisher bekannte Verankerungsverfahren durchgeführt werden. Jedoch ist vor dem Einbringen des Zugelementes zumindest an dem bodenseitigen Verankerungsabschnitt das Verbindungsmaterial in beliebiger Weise, vorzugsweise in einer Hülsenform aufgebracht. Nach dem Einbringen des so vorbereiteten Zugelementes in den Boden wird über eine Zuführleitung die fließfähige Verankerungsmasse im Bereich des bodenseitigen Verankerungsabschnitts am Zugelement eingebracht. Durch eine vorzugsweise vorgesehene Druckaufbringung kann die Verankerungsmasse in tiefere, radial vom Zugelement beabstandete Bodenbereiche eindringen, so dass ein relativ großer Verankerungskörper im Boden gebildet wird. Die aushärtbare Masse kann insbesondere eine Betonmasse oder eine sonstige Masse mit einem Zementleim sein.A preferred method variant of the invention is that the anchor body is introduced by introducing a hardenable anchoring mass via a feed line along the tension element in the ground, wherein the hardenable mass hardens to the anchor body. In this case, the method can basically be carried out as previously known anchoring methods. However, prior to the introduction of the tension element, the connection material is applied in any desired manner, preferably in a sleeve shape, at least at the base-side anchoring section. After introduction of the tension element prepared in this way into the ground, the flowable anchoring mass in the region of the ground-side anchoring section on the tension element is introduced via a feed line. By a preferably provided pressure application, the anchoring mass can penetrate into deeper, radially spaced from the tension element bottom portions, so that a relatively large anchoring body is formed in the ground. The hardenable Mass may in particular be a concrete mass or some other mass with a cement paste.
Grundsätzlich kann das Aufheizen des Verankerungsabschnitts des Zugelementes in beliebiger Weise erfolgen. Ein Aufheizen könnte über einen Brenner oder über ein chemisches Erzeugen der Wärmeenergie gebildet werden. Nach einer Weiterbildung der Erfindung ist es besonders effizient, dass das Aufheizen des zumindest bodenseitigen Verankerungsabschnitts des Zugelementes mittels einer elektrischen Heizeinrichtung erfolgt. Am freien Ende des Zugelementes können entsprechende Anschlüsse für eine elektrische Energiequelle vorgesehen sein. Vorzugsweise ist die elektrische Heizeinrichtung unmittelbar durch das Zugelement gebildet und/oder nur an dem Verankerungsabschnitt des Zugelementes vorgesehen.In principle, the heating of the anchoring portion of the tension element can take place in any desired manner. Heating could be formed via a burner or by chemically generating the heat energy. According to a development of the invention, it is particularly efficient that the heating of the at least bottom-anchoring section of the tension element takes place by means of an electrical heating device. At the free end of the tension element corresponding connections can be provided for an electrical energy source. Preferably, the electrical heating device is formed directly by the tension element and / or provided only on the anchoring portion of the tension element.
Die Erfindung wird vorzugsweise zur Abstützung von Baugrubenwänden eingesetzt. Der erfindungsgemäße Bodenanker kann aber auch anderweitig verwendet werden, etwa bei einer Hangsicherung, in Tunneln, an Bodenplatten etc.The invention is preferably used for supporting excavation walls. However, the ground anchor according to the invention can also be used elsewhere, for example in a slope protection, in tunnels, on ground plates, etc.
Die Erfindung wird nachfolgend anhand von bevorzugten Ausführungsbeispielen weiter beschrieben, welche schematisch in den beigefügten Zeichnungen dargestellt sind. In den Zeichnungen zeigen:
- Fig. 1
- eine schematische Querschnittsansicht zu einer erfindungsgemäßen Ankeranordnung mit verankertem Bodenanker; und
- Fig. 2
- eine schematische Querschnittsansicht der erfindungsgemäßen Ankeranordnung bei gelöstem Bodenanker.
- Fig. 1
- a schematic cross-sectional view of an anchor assembly according to the invention with anchored ground anchor; and
- Fig. 2
- a schematic cross-sectional view of the anchor assembly according to the invention with dissolved ground anchor.
Bei einer erfindungsgemäßen Ankeranordnung 10 gemäß
Der Bodenanker 20 weist ein stabförmiges, längliches Zugelement 22 auf, an dessen bodenseitigem Endbereich ein Verankerungsabschnitt 24 angeordnet ist. Entlang des Verankerungsabschnitts 24 ist aus einem Verbindungsmaterial 16 eine Hülse 18 gebildet. Das Verbindungsmaterial 16 ist im vorliegenden Ausführungsbeispiel ein spezielles Polymer, insbesondere Ultramid. Die Hülse 18 stellt ein Verbindungselement dar, welches das Zugelement 22 mit einem äußeren ringförmigen Verankerungskörper 12 verbindet.The
Der Verankerungskörper 12 ist durch Einleiten oder Injizieren einer aushärtbaren Masse von einer Oberfläche 6 des Bodens 5 entlang des Zugelementes 22 über eine Zuführleitung ausgebildet. Dabei kann als eine Verankerungsmasse eine fließfähige Betonsuspension verwendet werden, welche nach dem Injizieren zu dem Ankerkörper 12 aushärtet. Der Ankerkörper 12 ist über die Hülse 18 fest mit dem Verankerungsabschnitt 24 des Zugelementes 22 bei normalen Umgebungsbedingungen verbunden. Als Umgebungstemperatur ist im Ausführungsbeispiel 23°C angegeben, wobei die Festigkeitswerte grundsätzlich auch für Temperaturen bis zu 0°C und darunter gelten.The anchoring
Am freien Ende des Zugelementes 22 des Bodenankers 20 kann nach dem Aushärten des Ankerkörpers 12 ein Spannglied 26 etwa über eine Gewindeverbindung aufgebracht werden. Das Spannglied 26 kann so auf die Oberfläche 6 des Bodens 5 wirkende Druckkräfte, wie sie etwa an Baugrubenwänden entstehen, aufnehmen und über das Zugelement 22 und den Ankerkörper 12 in rückwärtige Bereiche des Bodens 5 ableiten. Das Zugelement 22 kann eine Länge von mehreren Metern, insbesondere bis zu 15 m und länger aufweisen.At the free end of the
Wenn es gewünscht ist, kann der erfindungsgemäße Bodenanker 20 in einfacher Weise wieder aus dem Boden 5 gezogen werden, wie in
Mit dem Aufheizen und Erreichen der vorgesehenen Lösetemperatur nimmt die Festigkeit des Verbindungsmaterials 16 erheblich ab, etwa auf 10% der Ursprungsfestigkeit bei Umgebungstemperatur. Bei einem definierten Anlegen einer Löse- oder Auszugskraft wird die Hülse 18 aus dem Polymer- oder Verbindungsmaterial 16 zerstört. Verbindungsmaterial 16 kann sowohl an einer Innenseite des ringförmigen Ankerkörpers 12 als auch an einer Außenseite des Zugelementes 22 verbleiben. Das vom Ankerkörper 12 gelöste Zugelement 22 kann so relativ leicht aus dem Boden 5 gezogen werden.With the heating and reaching the intended dissolution temperature, the strength of the
Nach einer Wiederaufbereitung ist es grundsätzlich möglich, das Zugelement 22 für ein weiteres Verankern einzusetzen.After a reprocessing, it is in principle possible to use the
Claims (10)
der Bodenanker (20) eine Heizeinrichtung zum Lösen des Zugelements (22) umfasst,
dadurch gekennzeichnet,
dass die Verbindung mit dem Zugelement (22) mit einem Verbindungsmaterial (16) gebildet ist, welches bei Umgebungstemperatur das Zugelement (22) fest mit dem Ankerkörper (12) verbindet, wobei die Verbindung bei einer vorgegebenen Lösetemperatur lösbar ist, welche sich von der Umgebungstemperatur unterscheidet.Anchor assembly in the ground (5), comprising a ground anchor (20) having an elongated tension member (22) inserted in a bore (7) in the ground (5), the tension member (22) being secured to a bottom anchoring portion (24 ) An anchor body (12) is connected, which has a larger outer diameter than the tension element (22), and
the ground anchor (20) comprises a heating device for releasing the tension element (22),
characterized,
that the connection with the tension member (22) is formed with a bonding material (16) which contains the tension member (22) is secured to the anchor body (12) at ambient temperature, wherein the connection is releasable at a predetermined dissolving temperature, which differs from the ambient temperature different.
dadurch gekennzeichnet,
dass das Verbindungsmaterial (16) ein Kunststoffmaterial und/oder ein metallisches Material aufweist, welches bei der Lösetemperatur schmilzt oder sich zersetzt.Anchor arrangement according to claim 1,
characterized,
in that the bonding material (16) comprises a plastic material and / or a metallic material which melts or decomposes at the dissolution temperature.
dadurch gekennzeichnet,
dass das Verbindungsmaterial (16) ein Polyamid, insbesondere PA6-I Ultramid B3L ist.Anchor arrangement according to claim 1 or 2,
characterized,
that the connecting material (16) is a polyamide, especially PA6 Ultramid B3L-I is.
dadurch gekennzeichnet,
dass das Verbindungsmaterial (16) als eine Hülse (18) ausgebildet ist, welche zumindest auf den bodenseitigen Verankerungsabschnitt (24) des Zugelementes (22) fest aufgebracht ist.Anchor arrangement according to one of claims 1 to 3,
characterized,
in that the connecting material (16) is designed as a sleeve (18) which is firmly attached to at least the bottom anchoring portion (24) of the tension element (22).
dadurch gekennzeichnet,
dass zumindest in dem bodenseitigen Verankerungsabschnitt (24) des Zugelementes (22) die Heizeinrichtung vorgesehen ist.Anchor arrangement according to one of claims 1 to 4,
characterized,
in that the heating device is provided at least in the base-side anchoring section (24) of the tension element (22).
dadurch gekennzeichnet,
dass die Heizeinrichtung als eine elektrische Heizeinrichtung ausgebildet ist.Anchor arrangement according to one of claims 1 to 5,
characterized,
in that the heating device is designed as an electrical heating device.
dadurch gekennzeichnet,
dass zumindest an dem bodenseitigen Verankerungsabschnitt (24) zum Verankern mit dem Ankerkörper (12) ein Verbindungsmaterial (16) angebracht ist, welches bei Umgebungstemperatur das Zugelement (22) fest mit dem Ankerkörper (12) verbindet und die Verbindung zum Ankerkörper (12) bei einer vorgegebenen Lösetemperatur lösbar ist, welche sich von der Umgebungstemperatur unterscheidet.Ground anchor for an anchor assembly (10) according to any one of claims 1 to 6, comprising an elongate tension member (22) to which an anchor body (12) is fixedly connectable to a bottom anchoring portion (24).
characterized,
that at least at the bottom anchoring portion (24) for anchoring to the anchor body (12) a connecting material (16) is mounted, which at ambient temperature, the tension element (22) fixed to the anchor body (12) and the connection to the anchor body (12) a predetermined Lösetemperatur is solvable, which differs from the ambient temperature.
bei dem eine Bohrung (7) in dem Boden (5) erstellt wird,
in which a hole (7) is made in the bottom (5),
dadurch gekennzeichnet,
dass der Ankerkörper (12) durch Einbringen einer aushärtbaren Verankerungsmasse über eine Zufuhrleitung entlang des Zugelementes (22) in den Boden (5) eingebracht wird, wobei die aushärtbare Masse zu dem Ankerkörper (12) aushärtet.Method according to claim 8,
characterized,
that the anchor body (12) by introducing a hardenable anchoring material is introduced via a feed line along the tension element (22) in the bottom (5), wherein the curable composition cures to the anchor body (12).
dadurch gekennzeichnet,
dass das Aufheizen des zumindest bodenseitigen Verankerungsabschnittes (24) des Zugelementes (22) mittels einer elektrischen Heizeinrichtung erfolgt.Method according to claim 8 or 9,
characterized,
that the heating of the at least bottom anchoring portion (24) of the tension element (22) by means of an electric heater.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP16198175.8A EP3321423B1 (en) | 2016-11-10 | 2016-11-10 | Anchor arrangement in the ground, ground anchor and procedure for anchoring. |
| PCT/EP2017/071642 WO2018086781A1 (en) | 2016-11-10 | 2017-08-29 | Anchor arrangement having ground, ground anchor, and method for anchoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP16198175.8A EP3321423B1 (en) | 2016-11-10 | 2016-11-10 | Anchor arrangement in the ground, ground anchor and procedure for anchoring. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3321423A1 true EP3321423A1 (en) | 2018-05-16 |
| EP3321423B1 EP3321423B1 (en) | 2020-01-08 |
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| WO (1) | WO2018086781A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206031A (en) * | 2019-05-08 | 2019-09-06 | 江苏科技大学 | A kind of temperature-responsive self-tightening anchor pole and its construction method |
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| EP0583725A1 (en) | 1992-08-17 | 1994-02-23 | Dyckerhoff & Widmann Aktiengesellschaft | Device for separating the tension rod of a soil anchor at a provided location |
| DE19500091C1 (en) | 1995-01-04 | 1996-04-04 | Dyckerhoff & Widmann Ag | Predetermined rupture position prodn. on tensile member of insert anchor |
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2016
- 2016-11-10 EP EP16198175.8A patent/EP3321423B1/en active Active
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| CH603915A5 (en) | 1977-03-09 | 1978-08-31 | Sommer Schenk Ag | Swimming pool cleaning machine |
| EP0583725A1 (en) | 1992-08-17 | 1994-02-23 | Dyckerhoff & Widmann Aktiengesellschaft | Device for separating the tension rod of a soil anchor at a provided location |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206031A (en) * | 2019-05-08 | 2019-09-06 | 江苏科技大学 | A kind of temperature-responsive self-tightening anchor pole and its construction method |
| CN110206031B (en) * | 2019-05-08 | 2020-10-16 | 江苏科技大学 | Temperature response self-tightening anchor rod and construction method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3321423B1 (en) | 2020-01-08 |
| WO2018086781A1 (en) | 2018-05-17 |
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