EP0583725B1 - Device for separating the tension rod of a soil anchor at a provided location - Google Patents
Device for separating the tension rod of a soil anchor at a provided location Download PDFInfo
- Publication number
- EP0583725B1 EP0583725B1 EP93112845A EP93112845A EP0583725B1 EP 0583725 B1 EP0583725 B1 EP 0583725B1 EP 93112845 A EP93112845 A EP 93112845A EP 93112845 A EP93112845 A EP 93112845A EP 0583725 B1 EP0583725 B1 EP 0583725B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tension member
- coil
- heat
- tension
- forms
- 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.)
- Expired - Lifetime
Links
- 239000002689 soil Substances 0.000 title abstract description 3
- 238000004804 winding Methods 0.000 claims abstract description 13
- 230000006698 induction Effects 0.000 claims abstract description 7
- 239000003302 ferromagnetic material Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 238000000926 separation method Methods 0.000 claims description 7
- 239000002907 paramagnetic material Substances 0.000 claims description 3
- 239000003779 heat-resistant material Substances 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 2
- 238000009413 insulation Methods 0.000 abstract description 6
- 230000006835 compression Effects 0.000 description 11
- 238000007906 compression Methods 0.000 description 11
- 238000004873 anchoring Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000011440 grout Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000005298 paramagnetic effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Images
Classifications
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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
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/04—Processes
- Y10T83/0405—With preparatory or simultaneous ancillary treatment of work
- Y10T83/041—By heating or cooling
- Y10T83/0414—At localized area [e.g., line of separation]
Definitions
- the invention relates to a device for severing a tension member of a compression anchor consisting of ferromagnetic material at a predetermined location according to the preamble of patent claim 1.
- a grout anchor has a tension member which is inserted into a borehole and brought deeply into the borehole by injecting hardening material, such as cement mortar or the like, with the borehole wall and thus with the surrounding soil.
- hardening material such as cement mortar or the like
- the tension member can be formed from a single element or from several elements, which in turn can consist of steel rods, wires, strands or even steel tubes.
- the length of the tension member over which it is embedded in the compression body is referred to as the anchoring length Lv, the remaining length, which is freely stretchable for the purpose of prestressing, as the free steel length L f .
- Grout anchors can be used to permanently anchor structures in the ground; but they can also be used only temporarily, such as. B. for backward anchoring of the wall of an excavation pit. If a temporary grouting anchor extends into a neighboring property, it usually has to be removed after completion of the construction work for which it was used.
- a separating option for the tension member is usually provided at the transition from the anchoring length Lv to the free steel length L f , so that the free part of the tension member can be pulled out of the borehole and possibly recovered.
- the grout itself which rarely has a length greater than about 4 to 8 m, can, when excavating work in the neighboring property, e.g. B. with bulldozers, mostly easy to remove.
- the use of heat to reduce the strength of the steel tension member is of the greatest importance because the means necessary to generate heat are installed together with the tension member without a substantial increase in the borehole diameter and are also operable over a longer period of time can be held.
- the tension member can be used with its full cross-section for the entire duration of its use.
- the tension member In order to generate the heat necessary to reduce the tensile strength of the tension member, it is known to use the tension member in the area of the predetermined breaking point by means of the exothermic reaction, e.g. B. an aluminothermic mixture to heat (FR 22 74 740).
- the exothermic reaction e.g. B. an aluminothermic mixture to heat (FR 22 74 740).
- an ignition system In order to trigger the exothermic reaction, an ignition system is required which is difficult to keep ignitable when the armature is installed, which can extend over a long period of time.
- the invention has for its object to provide a way to achieve such a high temperature level by using electrical energy in the steel tension member at the intended separation point in the shortest possible time that the separation occurs reliably and completely, so that the free steel length can be easily pulled out of the borehole.
- the invention is based on the finding that by using induction in a frequency range which allows transmission of the electrical energy via a commercially available feed cable, only heating of the tension member up to the Curie temperature is possible because the ferromagnetic material of the tension member, i.e. the Steel, after which it becomes largely paramagnetic and therefore only permits a very limited supply of energy by induction.
- the basic idea of the invention is that an additional possibility must be found for heating above the Curie temperature as far as possible up to the melting point.
- this consists in the arrangement of a tubular core made of electrically conductive, heat-resistant and paramagnetic material, preferably austenitic steel, between the primary winding and the steel tension member to be separated.
- the medium-frequency electrical current of 5 to 30 kHz which can be generated by means of suitable systems and can be transported over lengths of up to about 50 m without major losses to the intended separation point, in the tension member to be separated, which is how a short-circuited secondary winding acts, eddy currents generated, through which the entire cross-section of the tension member is heated evenly. It does not matter whether the clear cross section of the tubular core is completely or only partially filled by the material of the tension member or whether the tension member is wholly or locally in heat-conducting connection to the tubular core. Depending on the circumstances, any gaps can be filled with a gaseous (e.g. air), liquid (e.g. water) or solid (e.g. cement mortar, plastic) medium. In any case, the penetration depth of the electrical current should be selected so that it extends approximately to the center of the clear cross section of the tubular core, regardless of where the tension member or the tension members are located within this cross section.
- a gaseous e.g. air
- liquid
- the tubular core made of paramagnetic material which allows electrical energy to pass through to the tension member, also acts as a short-circuited secondary winding, which heats up due to its electrical conductivity. Because there is a very large temperature gradient in this phase, the heat can be given off radially inwards, i.e. against the tension member.
- the high temperature resistant thermal insulation layer between the tubular core and the primary winding prevents heat from flowing radially outwards.
- the second phase i.e. after the Curie temperature has been reached, electrical energy is still supplied to the same extent. Since the tension member has greatly reduced ferromagnetic properties in this phase, the proportion of induction is limited so that only little energy is consumed. The electrical energy still present in this phase is converted almost exclusively into heat in the tubular core due to the transformer effect. This heat is then transferred to the tension member by heat conduction and heat radiation, so that the melting point can be reached within the service life of the coil.
- the temperature level required for severing the steel tension member depends on the one hand on the material properties of the tension member and, on the other hand, on the tension or elongation conditions in the tension member as a result of existing or applied tensile forces and on the size of the freely movable or freely stretchable partial lengths of the tension member. Any space filling between the individual elements of the tension member practically influences the rate of temperature rise depending on the proportion of the cross-sectional area below the Curie temperature not and only slightly above the Curie temperature, namely only if it is in solid form and a large proportion of the cross-sectional area.
- the limit cases for the application of the invention are given by the existing mechanical tensile stress on the one hand by a slack steel tensile member, which has to be practically melted for severing, and on the other hand by a purely mechanically tensioned steel tensile member, which without heating in the area of the free steel length L. f failed somewhere.
- Fig. 1 shows a longitudinal section through a compression anchor, which consists of a steel tension member 1, z. B. a bundle of steel wire strands, which is inserted into a borehole 2.
- a grout 3 is generated in the compression body 3.
- the tension member 1 over a part 1 'of its total length, the so-called Anchorage length L v , anchored.
- the tension member 1 is freely stretchable over the remaining part 1 ′′ of its total length, the so-called free steel length L f .
- the tension member 1, z. B. to secure a pit wall 4, anchored by an anchor 5; the anchor 5 is not the subject of the invention.
- a device 6 by means of which a predetermined breaking point can be created by the action of heat on the tension member 1.
- the tension member 1 can be severed at this predetermined breaking point, so that its part 1 ′′ extending over the area of the free steel length L f can be pulled out of the borehole 2.
- the device 6 can either be in the free part 1 ′′ of the tension member 1, that is to say outside the compression body 3, but it can also — as shown — be embedded in the compression body 3.
- this part can be moved longitudinally through the pressing body 3 and at the lower end thereof by means of suitable anchoring means, e.g. B. anchored under pressure, be anchored.
- suitable anchoring means e.g. B. anchored under pressure
- the device 6 is located at the lower end of the tension member 1.
- FIG. 2 and 3 An embodiment of an inventive design of the device 6 for forming a predetermined breaking point is shown in Figs. 2 and 3 in longitudinal and cross section on a larger scale.
- the device 6 has the shape of an annular sleeve which can be pushed onto the tension member 1 before it is installed in the borehole 2.
- the device 6 consists of an inside-out structure a tubular core made of austenitic steel, the so-called carrier tube 7, and a high-temperature-resistant thermal insulation layer 8 arranged thereon.
- a coil 9 which acts like the primary winding of a transformer.
- the coil 9 preferably consists of an even number of layers, e.g. B. from two layers to be able to lead the two phases of a supply line 10 on the same side of the coil 9 for anchoring 5.
- the turns of the coil 9 are insulated from high temperatures, e.g. B. first coated with a thermal varnish and then wound with glass fibers.
- the tension member 1 consists of a bundle of seven individual steel wire strands 11, which are embedded directly in the compression body 3 in the region of the anchoring length L v and each individually in the region of the free steel length L f of protective tubes 12 made of plastic, for. B. PE, are encased. To secure the position or to protect against water, for example, the spaces between the individual strands 11 and the inner wall of the support tube 7 z. B. filled with polyurethane foam.
- FIG. 4 A further exemplary embodiment of a device according to the invention is indicated in FIG. 4, while the design of the device 6 itself corresponds to that which was described in connection with FIG. 2, the individual strands 11 of the tension member 1 are here within a range of the free steel length L f arranged single protective tube 13.
- the hardening material pressed in to produce the compression body 3 is prevented by a seal 14 from penetrating into the interior of the protective tube 13.
- the coil 9 is supplied with electrical current of a frequency via the supply line 10 of about 5 to 30 kHz and a voltage of about 500 to 800 V.
- the electrical energy can be provided via a system for generating electrical energy of higher frequency and can be supplied via a feed cable.
- eddy currents are hereby induced in this or in its individual elements, which lead to a relatively rapid heating up until the Curie temperature is reached.
- the support tube 7 made of austenitic steel similar to the tension member 1 itself, acts as a short-circuited winding and also heats up.
- the steel of the tension member 1 After the Curie temperature has been reached, the steel of the tension member 1 largely loses its ferromagnetic properties and behaves practically paramagnetically. Since electrical energy continues to be supplied, but only a little is consumed by the tension member 1, a greater electrical output than before is available for heating the carrier tube 7, which continues to act as a secondary coil. In this way, the heating of the tension member can be carried out practically up to the melting point.
- the degree to which the reduction in strength must be carried out depends on the tension or elongation still existing in the tension member 1. If the tension member is still tensioned at the time of severing, a lower temperature is sufficient for severing than in the cases in which the tension member has only a low tension or even is without tension.
- An advantage of the design of the device 6 according to the invention is that its functionality and that of the electrical feed cable can be checked at any time by conventional electrical measuring methods.
- the device 6 can only be operated with the corresponding electrical system of higher frequency; unwanted or unauthorized operation of the device, such as. B. by external energy sources such as lightning can be excluded.
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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)
- General Induction Heating (AREA)
- Forging (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Earth Drilling (AREA)
- Wire Processing (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Durchtrennen eines aus ferromagnetischem Material bestehenden Zugglieds eines Verpreßankers an einer vorgegebenen Stelle gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for severing a tension member of a compression anchor consisting of ferromagnetic material at a predetermined location according to the preamble of
Ein Verpreßanker weist ein Zugglied auf, das in ein Bohrloch eingeführt und im Bohrlochtiefsten durch Einpressen von erhärtendem Material, wie Zementmörtel oder dergleichen, mit der Bohrlochwandung und so mit dem umgebenden Erdreich in Verbund gebracht wird. Dadurch entsteht ein Verpreßkörper, der über den restlichen, zur Bohrlochmündung führenden Teil des Zuggliedes mit dem jeweils zu verankernden Bauteil kraftschlüssig verbunden ist. Das Zugglied kann aus einem einzigen Element oder aus mehreren Elementen gebildet sein, die ihrerseits aus Stahlstäben, -drähten, -litzen oder sogar Stahlrohren bestehen können. Die Länge des Zuggliedes, über die es im Verpreßkörper eingebettet ist, wird als Verankerungslänge Lv, die restliche, zum Zwecke der Vorspannung frei dehnbare Länge als freie Stahllänge Lf bezeichnet.A grout anchor has a tension member which is inserted into a borehole and brought deeply into the borehole by injecting hardening material, such as cement mortar or the like, with the borehole wall and thus with the surrounding soil. This creates a compression body, which is non-positively connected to the component to be anchored in each case via the remaining part of the tension member leading to the hole in the borehole. The tension member can be formed from a single element or from several elements, which in turn can consist of steel rods, wires, strands or even steel tubes. The length of the tension member over which it is embedded in the compression body is referred to as the anchoring length Lv, the remaining length, which is freely stretchable for the purpose of prestressing, as the free steel length L f .
Verpreßanker können zur dauernden Verankerung von Bauwerken im Erdreich dienen; sie können aber auch nur temporär eingesetzt werden, wie z. B. zur rückwärtigen Verankerung der Wand einer Baugrube. Wenn sich ein temporär eingesetzter Verpreßanker bis in ein Nachbargrundstück hinein erstreckt, muß er in aller Regel nach Beendigung der Bauarbeiten, für die er eingesetzt wurde, entfernt werden.Grout anchors can be used to permanently anchor structures in the ground; but they can also be used only temporarily, such as. B. for backward anchoring of the wall of an excavation pit. If a temporary grouting anchor extends into a neighboring property, it usually has to be removed after completion of the construction work for which it was used.
Zur Entfernung eines Verpreßankers wird zumeist am übergang der Verankerungslänge Lv zur freien Stahllänge Lf eine Trennmöglichkeit für das Zugglied vorgesehen, um so den freien Teil des Zuggliedes aus dem Bohrloch herausziehen und gegebenenfalls wiedergewinnen zu können. Der Verpreßkörper selbst, der selten eine größere Länge als etwa 4 bis 8 m aufweist, kann, wenn bei Aushubarbeiten im Nachbargrundstück flächig, z. B. mit Planierraupen gearbeitet wird, meist leicht entfernt werden.To remove an injection anchor, a separating option for the tension member is usually provided at the transition from the anchoring length Lv to the free steel length L f , so that the free part of the tension member can be pulled out of the borehole and possibly recovered. The grout itself, which rarely has a length greater than about 4 to 8 m, can, when excavating work in the neighboring property, e.g. B. with bulldozers, mostly easy to remove.
Von den verschiedenen Möglichkeiten zum Durchtrennen des Zugglieds eines Verpreßankers kommt der Anwendung von Wärme zur Verminderung der Festigkeit des Stahlzuggliedes größte Bedeutung zu, weil die zur Erzeugung von Wärme notwendigen Mittel ohne wesentliche Vergrößerung des Bohrlochdurchmessers mit dem Zugglied zusammen eingebaut und auch über eine größere Zeitspanne betriebsfähig gehalten werden können. Außerdem kann, wenn zur Trennung durch Verminderung seiner Festigkeit infolge Wärmeeinwirkung eine Sollbruchstelle geschaffen wird, das Zugglied während der gesamten Dauer seines Einsatzes mit seinem vollen Querschnitt ausgenützt werden.Of the various possibilities for severing the tension member of a compression anchor, the use of heat to reduce the strength of the steel tension member is of the greatest importance because the means necessary to generate heat are installed together with the tension member without a substantial increase in the borehole diameter and are also operable over a longer period of time can be held. In addition, if a predetermined breaking point is created for separation by reducing its strength due to the action of heat, the tension member can be used with its full cross-section for the entire duration of its use.
Zum Erzeugen der zur Verringerung der Zugfestigkeit des Zugglieds notwendigen Wärme ist es bekannt, das Zugglied im Bereich der Sollbruchstelle mittels der exothermen Reaktion, z. B. eines aluminothermischen Gemisches, zu erhitzen (FR 22 74 740). Um die exotherme Reaktion auszulösen, ist ein Zündsystem erforderlich, das in eingebautem Zustand des Ankers, der sich über eine längere Zeit erstrecken kann, nur schwer zündfähig zu halten ist.To generate the heat necessary to reduce the tensile strength of the tension member, it is known to use the tension member in the area of the predetermined breaking point by means of the exothermic reaction, e.g. B. an aluminothermic mixture to heat (FR 22 74 740). In order to trigger the exothermic reaction, an ignition system is required which is difficult to keep ignitable when the armature is installed, which can extend over a long period of time.
Es ist weiterhin bekannt, zum Erzeugen von Wärme elektrische Energie einzusetzen. Dies kann mittels eines elektrischen Heizelementes, z. B. in Form einer das Zugglied umgebenden Heizschlange geschehen (DE 24 28 729 C3) oder auch mittels einer das Zugglied an der Trennstelle umgebende Spule, die mit elektrischem Strom gespeist wird, um in dem oder den Zuggliedern durch Induktion Wärme zu erzeugen (CH 603 919). Dabei hat sich gezeigt, daß, trotz Anordnung von Wärmedämmschichten, eine zur zuverlässigen Trennung des Zugglieds ausreichende Temperatur nicht erreicht werden kann, weil ein Großteil der zugeführten Wärme schon über das Zugglied selbst durch Wärmeleitung abwandert.It is also known to use electrical energy to generate heat. This can be done by means of an electric heating element, e.g. B. in the form of a heating coil surrounding the tension member (DE 24 28 729 C3) or also by means of a coil surrounding the tension member at the point of separation, which is fed with electrical current in order to generate heat in the tension member (s) by induction (CH 603 919). It has been shown that, despite the arrangement of thermal insulation layers, a reliable separation of the Tension member sufficient temperature can not be reached because a large part of the heat supplied already migrates through the tension member itself by heat conduction.
Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, eine Möglichkeit zu schaffen, um durch Anwendung elektrischer Energie in möglichst kurzer Zeit im Stahlzugglied an der vorgesehenen Trennstelle ein so hohes Temperaturniveau zu erreichen, daß die Trennung zuverlässig und vollständig eintritt, so daß die freie Stahllänge ohne weiteres aus dem Bohrloch herausgezogen werden kann.Against this background, the invention has for its object to provide a way to achieve such a high temperature level by using electrical energy in the steel tension member at the intended separation point in the shortest possible time that the separation occurs reliably and completely, so that the free steel length can be easily pulled out of the borehole.
Gemäß der Erfindung wird diese Aufgabe durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmale gelöst.According to the invention, this object is achieved by the features specified in the characterizing part of
Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.Advantageous further developments result from the subclaims.
Der Erfindung liegt die Erkenntnis zugrunde, daß durch Anwendung von Induktion in einem Frequenzbereich, welcher eine übertragung der elektrischen Energie über ein handelsübliches Speisekabel zuläßt, lediglich eine Erwärmung des Zuggliedes bis zur Curie-Temperatur möglich ist, weil das ferromagnetische Material des Zuggliedes, also der Stahl, danach weitestgehend paramagnetisch wird und dadurch eine weitere Energiezufuhr durch Induktion nur noch sehr beschränkt zuläßt. Somit besteht der Grundgedanke der Erfindung darin, daß für eine Erwärmung über die Curie-Temperatur hinaus möglichst bis zum Schmelzpunkt eine zusätzliche Möglichkeit gefunden werden muß. Diese besteht gemäß der Erfindung in der Anordnung eines rohrförmigen Kerns aus elektrisch leitendem, hitzebeständigem und paramagnetischem Material, vorzugsweise aus austenitischem Stahl, zwischen der Primärwicklung und dem zu trennenden Stahlzugglied.The invention is based on the finding that by using induction in a frequency range which allows transmission of the electrical energy via a commercially available feed cable, only heating of the tension member up to the Curie temperature is possible because the ferromagnetic material of the tension member, i.e. the Steel, after which it becomes largely paramagnetic and therefore only permits a very limited supply of energy by induction. Thus, the basic idea of the invention is that an additional possibility must be found for heating above the Curie temperature as far as possible up to the melting point. According to the invention, this consists in the arrangement of a tubular core made of electrically conductive, heat-resistant and paramagnetic material, preferably austenitic steel, between the primary winding and the steel tension member to be separated.
Gemäß der Erfindung erfolgt die übertragung der Leistung nach dem Induktionsprinzip im wesentlichen in zwei Phasen:
- bis zur Curie-Temperatur, d. h. der Temperatur, bei der das Stahlzugglied vom ferromagnetischen in den paramagnetischen Bereich übergeht, erwärmt sich das Stahlzugglied aufgrund der Eindringtiefe des darin induzierten Stromes und der magnetischen Verluste durch direkten radialen Stromfluß sowie durch eine von dem rohrförmigen Kern ausgehende Wärmezufuhr;
- oberhalb der Curie-Temperatur bis zur Schmelztemperatur des Stahlzugglieds sind überwiegend Wärmeleitung und -strahlung des rohrförmigen Kerns für den weiteren Anstieg der Temperatur im Stahlzugglied wirksam.
- up to the Curie temperature, i.e. the temperature at which the steel tension member changes from the ferromagnetic to the paramagnetic range, the steel tension member heats up due to the penetration depth of the current induced therein and the magnetic losses through direct radial current flow and through a supply of heat coming from the tubular core ;
- Above the Curie temperature up to the melting temperature of the steel tension member, thermal conduction and radiation of the tubular core are predominantly effective for the further increase in the temperature in the steel tension member.
Dabei werden in der ersten Phase durch den mittelfrequenten elektrischen Strom von 5 bis 30 kHz, der mittels geeigneter Anlagen erzeugt und über Längen bis zu etwa 50 m auch noch ohne größere Verluste zur vorgesehenen Trennstelle transportiert werden kann, in dem zu trennenden Zugglied, das wie eine kurzgeschlossene Sekundärwicklung wirkt, Wirbelströme erzeugt, durch die der gesamte Querschnitt des Zugglieds gleichmäßig erwärmt wird. Dabei spielt es keine Rolle, ob der lichte Querschnitt des rohrförmigen Kerns durch das Material des Zugglieds vollständig oder nur teilweise ausgefüllt ist bzw. ob das Zugglied sich ganz oder stellenweise in wärmeleitender Verbindung zu dem rohrförmigen Kern befindet. Etwaige Zwischenräume können je nach den vorliegenden Gegebenheiten durch ein gasförmiges (z. B. Luft), flüssiges (z. B. Wasser) oder festes (z. B. Zementmörtel, Kunststoff) Medium ausgefüllt sein. Jedenfalls sollte die Eindringtiefe des elektrischen Stromes so gewählt werden, daß sie etwa bis in das Zentrum des lichten Querschnitts des rohrförmigen Kerns reicht, unabhängig davon, wo sich innerhalb dieses Querschnitts das Zugglied bzw. die Zugglieder befinden.In the first phase, the medium-frequency electrical current of 5 to 30 kHz, which can be generated by means of suitable systems and can be transported over lengths of up to about 50 m without major losses to the intended separation point, in the tension member to be separated, which is how a short-circuited secondary winding acts, eddy currents generated, through which the entire cross-section of the tension member is heated evenly. It does not matter whether the clear cross section of the tubular core is completely or only partially filled by the material of the tension member or whether the tension member is wholly or locally in heat-conducting connection to the tubular core. Depending on the circumstances, any gaps can be filled with a gaseous (e.g. air), liquid (e.g. water) or solid (e.g. cement mortar, plastic) medium. In any case, the penetration depth of the electrical current should be selected so that it extends approximately to the center of the clear cross section of the tubular core, regardless of where the tension member or the tension members are located within this cross section.
In dieser Phase wirkt der aus paramagnetischem Material bestehende rohrförmige Kern, der den Durchtritt der elektrischen Energie zum Zugglied ermöglicht, ebenfalls als kurzgeschlossene Sekundärwicklung, die sich aufgrund ihrer elektrischen Leitfähigkeit erwärmt. Weil in dieser Phase ein sehr großer Temperaturgradient besteht, kann die Wärme radial nach innen, also gegen das Zugglied abgegeben werden. Durch die hochtemperaturbeständige Wärmedämmschicht zwischen dem rohrförmigen Kern und der Primärwicklung wird verhindert, daß Wärme radial nach außen abfließt.In this phase, the tubular core made of paramagnetic material, which allows electrical energy to pass through to the tension member, also acts as a short-circuited secondary winding, which heats up due to its electrical conductivity. Because there is a very large temperature gradient in this phase, the heat can be given off radially inwards, i.e. against the tension member. The high temperature resistant thermal insulation layer between the tubular core and the primary winding prevents heat from flowing radially outwards.
In der zweiten Phase, also nach Erreichen der Curie-Temperatur, wird noch immer in gleichem Maße elektrische Energie zugeführt. Da das Zugglied in dieser Phase stark verminderte ferromagnetische Eigenschaften hat, ist der Anteil an Induktion beschränkt, so daß nur noch wenig Energie aufgenommen wird. Die in dieser Phase noch immer anstehende elektrische Energie wird fast ausschließlich in dem rohrförmigen Kern aufgrund des Transformatoreffekts in Wärme umgewandelt. Durch Wärmeleitung und Wärmestrahlung wird diese Wärme dann auf das Zugglied übertragen, so daß innerhalb der Standzeit der Spule der Schmelzpunkt erreicht werden kann.In the second phase, i.e. after the Curie temperature has been reached, electrical energy is still supplied to the same extent. Since the tension member has greatly reduced ferromagnetic properties in this phase, the proportion of induction is limited so that only little energy is consumed. The electrical energy still present in this phase is converted almost exclusively into heat in the tubular core due to the transformer effect. This heat is then transferred to the tension member by heat conduction and heat radiation, so that the melting point can be reached within the service life of the coil.
Das zur Durchtrennung des Stahlzugglieds erforderliche Temperaturniveau richtet sich einerseits nach den Materialeigenschaften des Zugglieds und andererseits nach den im Zugglied vorhandenen Spannungs- bzw. Dehnungsverhältnissen infolge von bestehenden oder aufgebrachten Zugkräften sowie nach der Größe der frei beweglichen bzw. frei dehnbaren Teillängen des Zuggliedes. Ein etwaige Zwischenräume zwischen den Einzelelementen des Zugglieds ausfüllendes Medium beeinflußt die Geschwindigkeit des Temperaturanstiegs je nach Anteil an der Querschnittsfläche unterhalb der Curie-Temperatur praktisch nicht und oberhalb der Curie-Temperatur nur geringfügig, nämlich nur dann, wenn es in fester Form und großem Anteil an der Querschnittsfläche vorliegt.The temperature level required for severing the steel tension member depends on the one hand on the material properties of the tension member and, on the other hand, on the tension or elongation conditions in the tension member as a result of existing or applied tensile forces and on the size of the freely movable or freely stretchable partial lengths of the tension member. Any space filling between the individual elements of the tension member practically influences the rate of temperature rise depending on the proportion of the cross-sectional area below the Curie temperature not and only slightly above the Curie temperature, namely only if it is in solid form and a large proportion of the cross-sectional area.
Die Grenzfälle für die Anwendung der Erfindung sind von der bestehenden mechanischen Zugspannung her einerseits durch ein schlaffes Stahlzugglied, welches zur Durchtrennung praktisch durchgeschmolzen werden muß, und andererseits durch ein rein mechanisch bis zum Bruch gespanntes Stahlzugglied gegeben, welches ohne Erwärmung im Bereich der freien Stahllänge Lf irgendwo versagt.The limit cases for the application of the invention are given by the existing mechanical tensile stress on the one hand by a slack steel tensile member, which has to be practically melted for severing, and on the other hand by a purely mechanically tensioned steel tensile member, which without heating in the area of the free steel length L. f failed somewhere.
Die Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Es zeigt
- Fig. 1
- einen schematischen Längsschnitt durch einen Verpreßanker,
- Fig. 2
- einen Längsschnitt durch eine erfindungsgemäße Vorrichtung zur Bildung einer Sollbruchstelle,
- Fig. 3
- einen Querschnitt entlang der Linie III-III in Fig. 2,
- Fig. 4
- eine andere Ausführungsform der Vorrichtung nach Fig. 2 und
- Fig. 5
- einen Querschnitt entlang der Linie V-V in Fig. 4.
- Fig. 1
- 2 shows a schematic longitudinal section through a compression anchor,
- Fig. 2
- 2 shows a longitudinal section through a device according to the invention for forming a predetermined breaking point,
- Fig. 3
- 3 shows a cross section along the line III-III in FIG. 2,
- Fig. 4
- another embodiment of the device of FIG. 2 and
- Fig. 5
- 3 shows a cross section along the line VV in FIG. 4.
Fig. 1 zeigt einen Längsschnitt durch einen Verpreßanker, der aus einem Stahlzugglied 1, z. B. einem Bündel aus Stahldrahtlitzen, besteht, das in ein Bohrloch 2 eingesetzt ist. Im unteren Teil des Bohrloches 2 ist durch Einpressen von erhärtendem Material, z. B. Zementmörtel, ein Verpreßkörper 3 erzeugt. Im Verpreßkörper 3 ist das Zugglied 1 über einen Teil 1' seiner Gesamtlänge, die sogenannte Verankerungslänge Lv, verankert. Über den restlichen Teil 1'' seiner Gesamtlänge, die sogenannte freie Stahllänge Lf, ist das Zugglied 1 frei dehnbar. An der Mündung des Bohrloches 2 ist das Zugglied 1, z. B. zur Sicherung einer Baugrubenwand 4, mittels einer Verankerung 5 verankert; die Verankerung 5 ist nicht Gegenstand der Erfindung.Fig. 1 shows a longitudinal section through a compression anchor, which consists of a
Im Bereich des überganges von der Verankerungslänge Lv zur freien Stahllänge Lf befindet sich eine Vorrichtung 6, mittels der durch Wärmeeinwirkung auf das Zugglied 1 eine Sollbruchstelle geschaffen werden kann. An dieser Sollbruchstelle ist das Zugglied 1 durchtrennbar, so daß sein sich über den Bereich der freien Stahllänge Lf erstreckender Teil 1'' aus dem Bohrloch 2 herausgezogen werden kann. Die Vorrichtung 6 kann entweder im freien Teil 1'' des Zugglieds 1, also außerhalb des Verpreßkörpers 3, liegen, sie kann aber auch - wie dargestellt - in den Verpreßkörper 3 eingebettet sein.In the area of the transition from the anchoring length L v to the free steel length L f there is a
Wenn zusätzlich der sich über die Verankerungslänge Lv erstreckende Teil 1' des Zugglieds 1 ausgebaut werden soll, kann dieser Teil längsbeweglich durch den Verpreßkörper 3 hindurchgeführt und an dessen unterem Ende mittels geeigneter Verankerungen, z. B. einem auf Druck beanspruchten Rohr, verankert sein. In diesem Fall befindet sich die Vorrichtung 6 am unteren Ende des Zugglieds 1.If in addition the part 1 'of the
Ein Ausführungsbeispiel für eine erfindungsgemäße Ausbildung der Vorrichtung 6 zur Bildung einer Sollbruchstelle ist in den Fig. 2 und 3 in Längs- und Querschnitt in größerem Maßstab dargestellt.An embodiment of an inventive design of the
Im dargestellten Ausführungsbeispiel hat die Vorrichtung 6 die Form einer Ringhülse, die auf das Zugglied 1 vor seinem Einbau in das Bohrloch 2 aufgeschoben werden kann. In ihrem Aufbau von innen nach außen besteht die Vorrichtung 6 aus einem rohrförmigen Kern aus austenitischem Stahl, dem sogenannten Trägerrohr 7, und einer darauf angeordneten hochtemperaturbeständigen Wärmedämmschicht 8. Darüber befinden sich die Windungen einer Spule 9, die wie die Primärwicklung eines Transformators wirkt. Die Spule 9 besteht vorzugsweise aus einer geradzahligen Anzahl von Lagen, z. B. aus zwei Lagen, um die zwei Phasen einer Versorgungsleitung 10 an derselben Seite der Spule 9 zur Verankerung 5 herausführen zu können. Die Windungen der Spule 9 sind hochtemperaturbeständig isoliert, z. B. zunächst mit einem Thermolack überzogen und dann mit Glasfasern umsponnen.In the illustrated embodiment, the
Im dargestellten Ausführungsbeispiel besteht das Zugglied 1 aus einem Bündel aus sieben einzelnen Stahldrahtlitzen 11, die im Bereich der Verankerungslänge Lv unmittelbar in den Verpreßkörper 3 eingebettet und im Bereich der freien Stahllänge Lf jeweils einzeln von Schutzrohren 12 aus Kunststoff, z. B. PE, umhüllt sind. Zur Lagesicherung oder auch zum Schutz gegen etwa eindringendes Wasser können die Zwischenräume zwischen den einzelnen Litzen 11 und der Innenwand des Trägerrohrs 7 z. B. mit Polyurethanschaum ausgefüllt sein.In the illustrated embodiment, the
Ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung ist in Fig. 4 angedeutet, Während die Ausbildung der Vorrichtung 6 selbst derjenigen entspricht, die im Zusammenhang mit Fig. 2 beschrieben wurde, sind die Einzellitzen 11 des Zugglieds 1 hier im Bereich der freien Stahllänge Lf innerhalb eines einzigen Schutzrohres 13 angeordnet. Das zum Erzeugen des Verpreßkörpers 3 eingepreßte erhärtende Material wird durch eine Dichtung 14 am Eindringen in das Innere des Schutzrohres 13 gehindert.A further exemplary embodiment of a device according to the invention is indicated in FIG. 4, while the design of the
Zum Durchtrennen des Zugglieds 1 wird die Spule 9 über die Versorgungsleitung 10 mit elektrischem Strom einer Frequenz von etwa 5 bis 30 kHz und einer Spannung von etwa 500 bis 800 V beaufschlagt. Die elektrische Energie kann über eine Anlage zur Erzeugung elektrischer Energie höherer Frequenz bereitgestellt und über ein Speisekabel zugeführt werden. In Abhängigkeit von der Eindringtiefe des in dem Spannglied 1 induzierten Stromes werden hierdurch in diesem bzw. in seinen einzelnen Elementen Wirbelströme induziert, die bis zur Erreichung der Curie-Temperatur zu einer relativ raschen Aufheizung führen. Während dieser Zeit wirkt das Trägerrohr 7 aus austenitischem Stahl, ähnlich wie das Zugglied 1 selbst, als kurzgeschlossene Wicklung und erwärmt sich ebenfalls. Weil in dieser Anfangsphase ein großer Temperaturgradient besteht, wird sehr viel Wärme nach innen gegen das Spannglied 1 abgegeben; infolge der hochtemperaturbeständigen Wärmedämmung und -isolierung wird nach außen nur sehr wenig Wärme fließen. Da das Trägerrohr 7 in diesem Temperaturbereich einen geringeren Temperaturanstiegsgradienten als das Zugglied 1 aufweist, ist damit zugleich ein thermischer und mechanischer Schutz der Spule 9 gewährleistet.To cut the
Nach Erreichen der Curie-Temperatur verliert der Stahl des Zugglieds 1 seine ferromagnetischen Eigenschaften weitestgehend und verhält sich praktisch paramagnetisch. Da weiterhin elektrische Energie zugeführt wird, durch das Zugglied 1 aber nur mehr wenig verbraucht wird, steht eine größere elektrische Leistung als zuvor zur Erwärmung des nach wie vor als Sekundärspule wirkenden Trägerrohrs 7 zur Verfügung. Auf diese Weise kann die Erwärmung des Zugglieds praktisch bis zum Schmelzpunkt geführt werden. Der Grad, bis zu dem die Verringerung der Festigkeit geführt werden muß, ist abhängig von der im Zugglied 1 noch bestehenden Spannung bzw. Dehnung. Ist das Zugglied zum Zeitpunkt der Durchtrennung noch gespannt, so genügt zum Durchtrennen eine geringere Temperatur als in den Fällen, in denen das Zugglied nur mehr eine geringe Spannung aufweist oder gar spannungslos ist.After the Curie temperature has been reached, the steel of the
Ein Vorteil der erfindungsgemäßen Ausbildung der Vorrichtung 6 besteht noch darin, daß ihre Funktionstüchtigkeit sowie diejenige des elektrischen Speisekabels sich zu jedem Zeitpunkt durch übliche elektrische Meßverfahren überprüfen lassen. Die Vorrichtung 6 kann nur mit der entsprechenden elektrischen Anlage höherer Frequenz betätigt werden; ungewollte oder unbefugte Betätigung der Vorrichtung, wie z. B. durch fremde Energiequellen, wie Blitz, können ausgeschlossen werden.An advantage of the design of the
Claims (3)
- A device for separating a tension member (1) of a pressure-grouted anchor consisting of ferromagnetic material at a predetermined location, wherein a predetermined breaking point is created in the tension member by decreasing its tensile strength, having a coil (9) which can be installed together with the tension member, which surrounds the latter at the intended separation point and which for the purpose of creating a predetermined breaking point by decreasing the tensile strength of the tension member as a result of heat action can be acted upon by induction with an electric current, characterised in that the coil (9) is arranged as a primary winding with the interposition of a high-temperature resistant heat-insulating layer (8) on a tubular core (7) of electrically conductive, heat-resistant and paramagnetic material, wherein the core (7) forms a first secondary winding and the tension member (1) forms a second secondary winding, and for separating the tension member the coil (9) is connected to a unit for applying electric energy to the coil, at a frequency of approximately 5 to 30 kHz and a voltage of approximately 500 to 800 V.
- A device according to Claim 1, characterised in that the tubular core (7) is formed of austenitic steel.
- A device according to Claim 1 or 2, characterised in that the coil (9) has an even number of windings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH2555/92 | 1992-08-17 | ||
CH2555/92A CH681835A5 (en) | 1992-08-17 | 1992-08-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0583725A1 EP0583725A1 (en) | 1994-02-23 |
EP0583725B1 true EP0583725B1 (en) | 1996-01-31 |
Family
ID=4236432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93112845A Expired - Lifetime EP0583725B1 (en) | 1992-08-17 | 1993-08-11 | Device for separating the tension rod of a soil anchor at a provided location |
Country Status (8)
Country | Link |
---|---|
US (1) | US5389765A (en) |
EP (1) | EP0583725B1 (en) |
JP (1) | JP3163207B2 (en) |
AT (1) | ATE133734T1 (en) |
CA (1) | CA2104146A1 (en) |
CH (1) | CH681835A5 (en) |
DE (1) | DE59301539D1 (en) |
NO (1) | NO932906L (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69420735T2 (en) * | 1994-12-14 | 2000-03-02 | Fokker Space B.V., Leiden | System for holding and separating construction elements |
DE19500091C1 (en) * | 1995-01-04 | 1996-04-04 | Dyckerhoff & Widmann Ag | Predetermined rupture position prodn. on tensile member of insert anchor |
NL1007078C2 (en) * | 1997-09-19 | 1999-03-22 | Ballast Nedam Funderingstechni | Towing member with failure means. |
NL1015346C2 (en) * | 2000-05-31 | 2001-12-03 | Visser & Smit Bouw Bv | Removal method for free anchor length of grouted anchor sunk into the ground, involves heating free anchor length to form point of weakness |
JP2007262880A (en) * | 2006-03-02 | 2007-10-11 | Ats & E Co Ltd | Device and method for cutting of tension member in buried anchor |
JP4910142B2 (en) * | 2006-10-05 | 2012-04-04 | 飛島建設株式会社 | High frequency induction heating anchor removal device |
JP5217054B2 (en) * | 2007-03-02 | 2013-06-19 | 住友電工スチールワイヤー株式会社 | Strand |
JP4729690B2 (en) * | 2007-03-22 | 2011-07-20 | 飛島建設株式会社 | Anchor removing apparatus by high frequency induction heating and method for removing the same |
JP4806370B2 (en) * | 2007-04-06 | 2011-11-02 | 飛島建設株式会社 | Vertical shaft construction method |
JP4806375B2 (en) * | 2007-05-11 | 2011-11-02 | 飛島建設株式会社 | Vertical wall construction method |
CH702926B9 (en) * | 2007-10-09 | 2011-12-30 | Stahlton Ag | Apparatus for an at least partially expandable anchor and method for at least partial expansion of an anchor. |
JP5067693B2 (en) * | 2007-10-23 | 2012-11-07 | 高周波熱錬株式会社 | Heating coil device and high-frequency heating device |
EP2998447B1 (en) | 2010-03-25 | 2017-10-04 | Stahlton AG | Method for at least partially removing an anchor |
CH711029B1 (en) | 2014-02-25 | 2018-06-15 | Vsl Int Ag | Assembly for anchoring device at least partially removable. |
EP3321423B1 (en) | 2016-11-10 | 2020-01-08 | BAUER Spezialtiefbau GmbH | Anchor arrangement in the ground, ground anchor and procedure for anchoring. |
DE202017102490U1 (en) | 2017-04-27 | 2017-05-17 | FiReP International AG | Anchor arrangement in the ground as well as ground anchors |
CN110080220B (en) * | 2019-05-24 | 2023-11-28 | 北京爱地地质勘察基础工程公司 | Soil body anchor rod structure with heating solidification function and application method thereof |
CN111042105B (en) * | 2019-12-09 | 2021-08-17 | 青海民族大学 | Collapsible loess foundation ditch antiskid collapse melting lead and aluminum melting plate knot support pile |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2178720A (en) * | 1938-02-23 | 1939-11-07 | Du Pont | Induction heated pipe |
US2948797A (en) * | 1959-01-30 | 1960-08-09 | Gen Electric | Annealing furnace |
US4007349A (en) * | 1973-02-14 | 1977-02-08 | John Charles Burley | Inductive method for cutting cloth |
DE2428729C3 (en) * | 1974-06-14 | 1981-12-24 | Philipp Holzmann Ag, 6000 Frankfurt | Method for removing the tension member of a grouting anchor |
FR2274740A1 (en) * | 1975-06-27 | 1976-01-09 | Fischer Joachim | Extraction method for steel rod ground anchors - rupture zone in rod adjacent to anchor block is formed by heating |
CH603919A5 (en) * | 1976-04-02 | 1978-08-31 | Losinger Ag | Releasing free section of tie anchor |
JPH0255942U (en) * | 1988-10-17 | 1990-04-23 | ||
US4916278A (en) * | 1989-09-01 | 1990-04-10 | Thermatool Corporation | Severing metal strip with high frequency electrical current |
-
1992
- 1992-08-17 CH CH2555/92A patent/CH681835A5/de not_active IP Right Cessation
-
1993
- 1993-08-09 JP JP19738993A patent/JP3163207B2/en not_active Expired - Fee Related
- 1993-08-11 DE DE59301539T patent/DE59301539D1/en not_active Expired - Fee Related
- 1993-08-11 AT AT93112845T patent/ATE133734T1/en not_active IP Right Cessation
- 1993-08-11 EP EP93112845A patent/EP0583725B1/en not_active Expired - Lifetime
- 1993-08-16 CA CA 2104146 patent/CA2104146A1/en not_active Abandoned
- 1993-08-16 NO NO932906A patent/NO932906L/en unknown
- 1993-08-17 US US08/108,080 patent/US5389765A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CH681835A5 (en) | 1993-05-28 |
NO932906D0 (en) | 1993-08-16 |
US5389765A (en) | 1995-02-14 |
ATE133734T1 (en) | 1996-02-15 |
CA2104146A1 (en) | 1994-02-18 |
JP3163207B2 (en) | 2001-05-08 |
EP0583725A1 (en) | 1994-02-23 |
JPH06158656A (en) | 1994-06-07 |
NO932906L (en) | 1994-02-18 |
DE59301539D1 (en) | 1996-03-14 |
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