EP1154077B1 - Recoverable injection anchor - Google Patents
Recoverable injection anchor Download PDFInfo
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- EP1154077B1 EP1154077B1 EP01111051A EP01111051A EP1154077B1 EP 1154077 B1 EP1154077 B1 EP 1154077B1 EP 01111051 A EP01111051 A EP 01111051A EP 01111051 A EP01111051 A EP 01111051A EP 1154077 B1 EP1154077 B1 EP 1154077B1
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- European Patent Office
- Prior art keywords
- pressure
- der
- anchor
- elements
- anchoring base
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- 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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- 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 a re-expandable ground anchor according to the preamble of independent claim 1.
- Press anchors according to EN 1537 or DIN 4125 usually consist of a tension member, usually made of prestressing steel in the form of rods, wires or strands used for the purpose of back anchoring a component or a Baugruben-enclosing wall in a borehole in the underground and by pressing a hardening medium, usually a cement suspension, is brought into bond to the substrate.
- the lower part of such an anchor is designed as an adhesive or composite route, while called in the upper part, free steel length or free play range, the tension member for the purpose of bias with hydraulic device remains freely stretchable.
- the load-bearing behavior of the ground anchors is distinguished from those with a direct bond to the ground and so-called pressure tube anchors.
- the tension member is in its entire length in a cladding tube without contact to the grout and is enclosed in the composite area of the pressure tube, in which the anchor force is introduced at the lower end via an anchor base construction, and this about the hardened grout into the ground transfers.
- the longitudinal force in the pressure tube has at the lower end of their maximum value, namely in the contact joint to the anchor foot, and then builds up to the upper (“air side") towards end continuously.
- the outer surface of the pressure pipe must be profiled sufficiently strong to be able to deliver the anchor force without "internal composite break" to the surrounding grout cement mortar and on to the soil.
- the pressure tube is composed of individual hollow cylinder elements of limited height:
- the hollow cylinder elements consist of thick-walled steel tube sections, which are stapled together by welding points; according to the EP 0 545 471 A1 They consist of prefabricated rings made of high-strength concrete.
- the sections of tubular steel are not a major obstacle when working with traditional civil engineering equipment, as they are easy to separate, but can make the use of today's trench wall cutters in the affected area almost impossible.
- the concrete rings have despite modern concrete formulations only a limited compressive strength, with the result that the anchor, especially those for higher forces, disproportionately heavy and require oversized Bohrdruckmesser, so that the cost increases sharply.
- the concept with the concrete rings for practical reasons on anchor with tension members made of steel bars and their limited use loads remains limited, and that during installation practically constant and therefore expensive crane assistance is necessary.
- JP-A-04143312 is a re-expandable anchor known.
- This includes a pressure tube, a Stahlzugglied of prestressing steel strands and an anchor base construction at the lower end of the pressure tube, in which the tension member is anchored by means of segment wedges in a Ankerfuß Swiss made of steel.
- the Anchor foot piece is integrally formed and has in the anchoring area conical holes for receiving the segment wedges. In close contact with the anchoring area, an externally electrically ignitable exothermic heat source is provided, which is intended to heat the anchor base structure to temperatures of 1000 ° C. to 2000 ° C.
- the concomitant increase in diameter of the conical bores, together with the weakened by the thermal action surface of the tension members to a reduction in the anchoring force.
- a shear fracture is created on the tension member surface so that the tension members can disengage from the segment wedges and be pulled out of the wellbore.
- the pressure tube anchor a pressure tube made of highly pressure-resistant, but brittle, easily destructible material in the ground and a Stahlzugglied, which solved after the use of the anchor at the anchor foot and in its entirety Length can be removed again from the underground.
- the pressure pipe according to the invention is such that, for example, with the commonly used in anchorage drilling ⁇ 133 mm, a temporary grout anchor with about 1,000 kN working load can be installed, and that remain after removal of the tension member only a few steel parts small size in the ground.
- the pressure tube of the injection anchor consists of a series of lined hollow cylindrical pressure elements, which either have a circular cylindrical shape, or which are preferably assembled from two half-shells or a plurality of segmental, together forming a circular cross-section lamellae of equal length, and of a non-metallic, mineral material made of high strength, such as preferably made of glass, but also ceramic, glass ceramic, etc. or of a high-strength special concrete such as Ductal the company Lafarge, France.
- the release can be done in two ways. In both methods, the Stahlzugglied in Ankerfußin, also called wedge carrier plate, anchored using the known two- or three-piece so-called segment wedges, sitting in matching conical holes in the disc and under the tensile load of the strands by means of internal teeth in this festbei conference.
- the first of the two methods is reflected in the claims 1 to 5 again and is characterized by the fact that the wedge carrier plate of the anchor foot is not, as usual, monolithically made of steel. Rather, it consists only in its highly loaded on Ringzug edge region and the bottom - in the manner of a thick-walled sleeve with conical wall - made of high-strength steel, while the inner region in which the conical bore for the wedges are consists of a only moderately tensile and pressure-resistant, but meltable at a relatively low temperature material.
- the wedge carrier plate metals such as zinc, tin, aluminum, magnesium, etc. or their alloys, or high pressure and creep-resistant plastics can be used.
- so-called eutectic alloys of the abovementioned metals are also suitable, or those which allow optimization by the chosen mixing ratio between the compressive strength, which is as high as possible, and the melting temperature, which should be as low as possible.
- heat sources for heating the fusible core portion of the wedge support plate are primarily electrical heating elements in question, preferably rod-shaped in the central axis in the form of heating cartridges (from the mold and tooling known), or for example, surface-mounted above or below the plate or Also as heating coils in the core of the plate can be integrated.
- alumino-thermal fire rate (thermite) with electric ignition, which can be preferably installed behind the plate.
- thermoite alumino-thermal fire rate
- an incendiary charge can be designed and dimensioned in such a way that it is sufficient to produce the wedge-carrier plate monolithically from steel without the easily fusible core region.
- a pyrotechnic propellant such as calcium or magnesium carbonate
- a pyrotechnic propellant such as calcium or magnesium carbonate
- This effect causes the strands of the tension member targeted by the hot reaction gases in which shares of liquid molten iron can be carried, met in the sense of a "flame jet” and selectively weakened or severed, which is why suitable channels provided in the wedge support plate for this purpose are.
- Fig. 1 shows the view of the injection anchor according to the invention in the borehole, comprising the Stahlzugglied 1, the tension elements 2 in the HDPE sheath 3 and the pressure tube 4, consisting of paired half-shells 5, the anchor force to the grout 7 and further to the Substrate 8.
- the Ankerfußkonstrutation 9 At the bottom end of the anchor is the Ankerfußkonstrutation 9, which initiates the anchor force from the tension member 1 in the pressure tube 4, and in which the tension elements 2 are fanned out and anchored, see also Fig. 4 .
- FIGS. 2 and 3 show in longitudinal and cross-section of any portion of the invention, composed of the half-shell pressure elements 5 pressure tube - without the Stahlzugglied 1 and 2 and its sheath 3 -, wherein the half shells not shown with plane-parallel cut off front ends, but with the production-related slope 5a are.
- the Stirnfuge 10 between the pressure elements 5 is optionally equipped with the intermediate ring 11 or the spacer 12 which in Fig. 2 both are shown half-sided.
- the pressure elements 5 are provided with the external profiling 6, which preferably consists of a grid of mutually joined hollow pyramids 6a, between which in each case in the direction of force co-supporting ribs 6b remain.
- Fig. 4 is shown - only in longitudinal section - the connection of Stahlzuggliedes 1 and 2 with the cladding tube 3 to the Ankerfußkonstrutation 9, which manages according to the invention without widening of the cladding tube 3 in the region of the pressure elements 5.
- the base plate 17 of the anchor foot receives a through center bore 18, which is only slightly larger than the outer diameter of the cladding tube 3.
- the bore is internally provided with a profiling or a thread 19, in / the the PE material of Pressing and fixing Hüllrohrwandung after this has been heated at the end and fixed there with the help of the pressed-tube spout 20.
- the connection described is safe against loosening during transport and installation of the anchor as against penetration of cement mortar during the pressing and Nachverpressvorganges.
- the base plate 17 of the anchor base construction of the anchor according to the invention can optionally be made of a high pressure resistant, but brittle glass fiber laminate, which can be destroyed in the soil, such as the entire pressure tube, by trench wall milling etc.
- the pressure piece 21 is preferably made of glass - here with plane-parallel sawed ends - and made with the pressure ring 22, preferably made of a glass fiber mat, against the Ankerfußplatte 23.
- the tension member 1 of the pressure tube injection anchor made of tension wire strands 2 is anchored by means of the segment wedges 24 in the core portion 25 of the Ankerfußplatte 23, which consists of a meltable at low temperature metal alloy.
- the Ankerfußplatte has the shape of a thick-walled bush made of steel, whose Wall 23a surrounds the core portion 25 in the sense of a pull ring and "catches" the occurring plastic deformation of the soft metal 25 under the high radial reaction forces of the segment wedges 24 and limited to a permissible level.
- the required heating element for the Ankerfußplatte 23 is shown in the form of the axially arranged electric heating element 26, with the cable 27 in the protective tube 27 a as a power supply.
- the Ankerfuß Swiss is closed with a cover 28 to the rear and are on the pressure piece 21 and the base plate 17, the anchor tension on the pressure tube 4 and 5, the grout 7 and the substrate 8 on.
- the cavities 30 of the Ankerfußkonstrutation to be filled with a proven corrosion protection compound to reliably prevent possible corrosive effects of the non-ferrous metals of the core portion 25 in the presence of water on the prestressing steel of the strands 2.
- the heating cartridge 26 When installing the anchors on the site, it may be appropriate, after tightening and securing the anchor, the heating cartridge 26 to activate briefly to possible gaps, air pockets or voids in the potting compound due to possible movements of the strands and wedges during winding and unwinding as when tightening to eliminate.
- the optionally made of solid steel Ankerfuß Swiss 31 without fusible core area is equipped with the Thermit fire set 32, this with the electric igniter 33 and the power supply 27 in the protective tube 27 a.
- the effect of the fire charge 32 may preferably be enhanced by the addition of a pyrotechnic blowing agent in the reaction mixture to produce a highly effective "blow-off effect".
- channels 34 are provided along the conical holes for the anchoring wedges (in Fig. 8 rotated 90 ° in the image plane and in Fig. 7 dashed lines), which should lead the hot reaction gases of the fire rate 32 to the strands 2 zoom to weaken them for the expansion of the tension member selectively or cut.
- the function of the channels 34 can be reinforced in the given case by the column 35 between the wedge segments 24 or taken over in their entirety.
- the anchor base portion of the clamping channel 36 In order to mitigate the damming effect of penetrated into the cladding tube water, it may be appropriate to fill the lower, the anchor base portion of the clamping channel 36 with a little or no heat-resistant foam, on the one hand keeps water away, on the other hand, the hot reaction gases no high resistance offers.
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Abstract
Description
Die Erfindung bezieht sich auf einen wieder ausbaubaren Verpressanker gemäß dem Oberbegriff des unabhängigen Patentanspruchs 1.The invention relates to a re-expandable ground anchor according to the preamble of independent claim 1.
Verpressanker nach EN 1537 bzw. DIN 4125 bestehen zumeist aus einem Zugglied, in der Regel aus Spannstahl in Form von Stäben, Drähten oder Litzen, das zum Zweck der Rückverankerung eines Bauteils oder einer Baugruben-Umschließungswand in ein Bohrloch im Untergrund eingesetzt und durch Einpressen eines erhärtenden Mediums, in der Regel einer Zementsuspension, in Verbund zum Untergrund gebracht wird. Der untere Teil eines solchen Ankers ist dabei als Haft- oder Verbundstrecke ausgebildet, während im oberen Teil, freie Stahllänge oder Freispielstrecke genannt, das Zugglied zum Zwecke der Vorspannung mit hydraulischem Gerät frei dehnbar bleibt.Press anchors according to EN 1537 or DIN 4125 usually consist of a tension member, usually made of prestressing steel in the form of rods, wires or strands used for the purpose of back anchoring a component or a Baugruben-enclosing wall in a borehole in the underground and by pressing a hardening medium, usually a cement suspension, is brought into bond to the substrate. The lower part of such an anchor is designed as an adhesive or composite route, while called in the upper part, free steel length or free play range, the tension member for the purpose of bias with hydraulic device remains freely stretchable.
Je nach Einsatzdauer der Verpressanker wird unterschieden zwischen Dauerankern für permanenten Einsatz mit dem sogenannten doppelten Korrosionsschutz und Kurzzeit- oder Temporärankern für vorübergehende Einsätze bis zu zwei Jahren mit einfachem Korrosionsschutz.Depending on the duration of use of the ground anchors, a distinction is made between permanent anchors for permanent use with the so-called double corrosion protection and short-term or temporary core for temporary use up to two years with simple corrosion protection.
Vom Tragverhalten der Verpressanker her unterscheidet man solche mit direktem Verbund zum Untergrund und sogenannte Druckrohr-Anker. Bei Druckrohr-Ankern, auf die sich die Erfindung bezieht, liegt das Zugglied in seiner ganzen Länge in einem Hüllrohr ohne Kontakt zum Verpresskörper und ist im Verbundbereich vom Druckrohr umschlossen, in das die Ankerkraft am unteren Ende über eine Ankerfußkonstruktion eingeleitet wird, und das diese über den erhärteten Verpressmörtel in den Untergrund überträgt. Die Längskraft im Druckrohr hat an dessen unterem Ende ihren Maximalwert, nämlich in der Kontaktfuge zum Ankerfuß, und baut sich dann zum oberen ("luftseitigen") Ende hin kontinuierlich ab.The load-bearing behavior of the ground anchors is distinguished from those with a direct bond to the ground and so-called pressure tube anchors. In pressure tube anchors, to which the invention relates, the tension member is in its entire length in a cladding tube without contact to the grout and is enclosed in the composite area of the pressure tube, in which the anchor force is introduced at the lower end via an anchor base construction, and this about the hardened grout into the ground transfers. The longitudinal force in the pressure tube has at the lower end of their maximum value, namely in the contact joint to the anchor foot, and then builds up to the upper ("air side") towards end continuously.
Die äußere Mantelfläche des Druckrohres muss ausreichend stark profiliert sein, um die Ankerkraft ohne "inneren Verbundbruch" an den umgebenden Verpresskörper aus Zementmörtel und weiter an das Erdreich abgeben zu können.The outer surface of the pressure pipe must be profiled sufficiently strong to be able to deliver the anchor force without "internal composite break" to the surrounding grout cement mortar and on to the soil.
In heutiger Zeit besteht ein ständig wachsendes Interesse am Markt an wieder ausbaubaren Kurzzeitankern, d. h. an solchen Verpressankern, die sich nach dem Ende der Baumaßnahmen möglichst vollständig aus dem Untergrund entfernen lassen, um spätere Tiefbauarbeiten im betroffenen Bereich so wenig wie möglich zu erschweren bzw. um darauf begründete Rechtsfolgen wie Strafgelder für im Boden zurückgelassene Ankerstähle etc. abzuwehren.At present, there is a growing interest in the market of rebuilt short-term anchors, ie. H. on such anchors that can be removed as completely as possible from the ground after the end of the construction measures to complicate later civil engineering work in the affected area as little as possible or to ward off legal consequences such as penalties for left behind in the ground anchor rods etc.
Von bekannten ausbaubaren Druckrohr-Ankern sollen hier stellvertretend für andere zwei Beispiele erwähnt werden, nämlich die in der
Bei den aus diesen Druckschriften bekannten Druckrohr-Ankern ist das Druckrohr aus einzelnen Hohlzylinder-Elementen begrenzter Höhe zusammengesetzt: Gemäß der
Aus der
Aufgabe der vorliegenden Erfindung ist, einen wieder ausbaubaren Verpressanker zu schaffen, der wenigstens eine, bevorzugt aber alle der im folgenden genannten Eigenschaften aufweist:
- das im Boden nach dem Ausbau verbleibende Druckrohr darf praktisch kein Hindernis für Tiefbauarbeiten mit jeglichem Gerät darstellen,
- die Bauart und Tragkraft unterliegen nicht den Beschränkungen der Stabstähle, da für das Zugglied bevorzugt die sogenannten Spanndrahtlitzen eingesetzt werden können,
- der erforderliche Bohrdurchmesser ist bevorzugt nicht größer als der der normalen, nicht ausbaubaren Kurzzeitanker,
- der Verpressanker soll von einer üblichen Bohrmannschaft praktisch ohne Kranhilfe eingebaut werden können,
- der Ankerfuß soll zuverlässig gelöst werden können, wobei dies bevorzugt auf thermoelektrischem Wege erfolgen soll.
- the pressure pipe remaining in the soil after removal must not be an obstacle to civil engineering work with any device,
- the type and carrying capacity are not subject to the limitations of the bar steels, since the so-called tension wire strands can preferably be used for the tension member,
- the required drilling diameter is preferably not greater than that of the normal, non-removable short-term anchors,
- the ground anchor should be able to be installed by a usual drilling crew practically without crane help,
- the anchor foot should be able to be reliably released, this preferably being done thermoelectrically.
Erfindungsgemäß wird von einem Druckrohr-Anker gemäß dem Oberbegriff des unabhängigen Anspruchs 1 ausgegangen, der durch die kennzeichnenden Merkmale des unabhängigen Anspruchs 1 weitergebildet wird. Vorteilhafte Weiterbildungen sind Gegenstand der Unteransprüche.According to the invention is based on a pressure tube anchor according to the preamble of independent claim 1, which is further developed by the characterizing features of the independent claim 1. Advantageous developments are the subject of the dependent claims.
Bei einer ersten von den Patentansprüchen 1 bis 5 nicht umfassten Lösung der erfindungsgemäßen Aufgabe weist der Druckrohranker ein Druckrohr aus hoch druckfestem, aber sprödem, im Boden leicht zerstörbarem Material und ein Stahlzugglied auf, das nach dem Gebrauch des Ankers am Ankerfuß gelöst und in seiner gesamten Länge wieder aus dem Untergrund entfernt werden kann. Das erfindungsgemäße Druckrohr ist so beschaffen, dass beispielsweise mit der im Ankerbau gebräuchlichen Bohrverrohrung Ø 133 mm ein temporärer Verpressanker mit ca. 1.000 kN Gebrauchslast eingebaut werden kann, und dass nach Ausbau des Zuggliedes nur wenige Stahlteile geringer Größe im Untergrund verbleiben.In a first not covered by the claims 1 to 5 solution of the problem of the invention, the pressure tube anchor a pressure tube made of highly pressure-resistant, but brittle, easily destructible material in the ground and a Stahlzugglied, which solved after the use of the anchor at the anchor foot and in its entirety Length can be removed again from the underground. The pressure pipe according to the invention is such that, for example, with the commonly used in anchorage drilling Ø 133 mm, a temporary grout anchor with about 1,000 kN working load can be installed, and that remain after removal of the tension member only a few steel parts small size in the ground.
Das Druckrohr des erfindungsgemäßen Verpressankers besteht hierzu aus einer Folge aneinandergereihter hohlzylindrischer Druckelemente, die entweder eine kreiszylindrische Form aufweisen, oder die bevorzugt aus jeweils zwei Halbschalen oder mehreren segmentförmigen, zusammen einen Kreisquerschnitt bildenden Lamellen gleicher Länge zusammengefügt sind, und die aus einem nichtmetallischen, mineralischen Werkstoff hoher Festigkeit gefertigt sind, wie bevorzugt aus Glas, aber auch Keramik, Glaskeramik etc. oder aus einem hochfesten Sonderbeton wie Ductal der Firma Lafarge, Frankreich.For this purpose, the pressure tube of the injection anchor according to the invention consists of a series of lined hollow cylindrical pressure elements, which either have a circular cylindrical shape, or which are preferably assembled from two half-shells or a plurality of segmental, together forming a circular cross-section lamellae of equal length, and of a non-metallic, mineral material made of high strength, such as preferably made of glass, but also ceramic, glass ceramic, etc. or of a high-strength special concrete such as Ductal the company Lafarge, France.
Das Konzept des erfindungsgemäßen Druckrohr-Ankers baut im wesentlichen auf folgenden Grundgedanken und konstruktiven Vorgaben auf:
- Von größter Bedeutung für die Wirtschaftlichkeit der Anker ist es, den Außendurchmesser des Druckrohres so weit wie möglich zu minimieren, d. h. eine möglichst hohe Auslastung des Druckrohrquerschnittes zu erreichen, um so den benötigten Bohrrohr-Durchmesser möglichst klein zu halten. Dabei muss im Bohrrohr innen immer genug Ringraum für das unbehinderte Strömen des Injiziermörtels während des Verpressvorganges des Ankers verbleiben, so dass es nicht zu den gefürchteten "Verstopfungen" und/oder, beim drehenden Ziehen der Bohrrohre, zum Einklemmen von Festpartikeln im engen Ringraum zwischen Anker und Bohrrohr und "Mitnehmen" bzw. "Verwürgen" des Ankers kommen kann.
- Die erreichbare Tragfähigkeit eines hochfesten, aber spröden Werkstoffes der Druckrohrelemente ohne jegliche Duktilität wie Glas hängt entscheidend davon ab, wie gleichmäßig und "störungsfrei" die Einleitung der Längskraft an den Stirnseiten der Tragelemente erfolgt. Da in dem spröden Werkstoff keinerlei innere Lastumlagerungen stattfinden, würden beispielsweise an Punkten direkter Berührung der Tragelemente untereinander oder mit einem Fremdkörper größerer Härte in der Fuge örtlich hohe Spannungsspitzen entstehen, die alsbald den Bruch und somit das vorzeitige Versagen des Druckrohres einleiten würden. Der kritischste aller Querschnitte ist dabei die Kontaktfuge am Ankerfuß, in der die gesamte Ankerkraft ohne Schaden aufgenommen werden muss.
- Eine sowohl technisch wie wirtschaftlich vorteilhafte Lösung für dieses Problem wird dadurch erreicht, dass bei der Montage des Druckrohres zwischen den Elementen ein axialer Ringspalt definierter Bereite erzeugt wird, indem man dort Abstandhalter geeigneter Abmessungen und Formgebung zum Beispiel aus Hart-PVT einlegt. Der Spalt füllt sich dann beim Verpressen des Ankers von selbst mit Zementmörtel, der in den Stirnfugen der Druckelemente "ideal homogene" Bettungsbedingungen gewährleistet. Dabei spielt es keine Rolle, wenn der Ringspalt infolge einer fertigungsbedingten Schräge der Stirnflächen von 3 bis 5° nicht eine konstante, sondern eine längs des Umfanges variable Breite aufweist. Teure planparallele Sägeschnitte an den Stirnseiten der Druckelemente können so vermieden werden.
- Die plastische Zusammendrückung des Zementmörtels in den Stirnfugen wirkt sich in einer geringfügig erhöhten bleibenden Verschiebung während Belastungsprobe der Anker aus, bleibt aber ohne Einfluss auf das Tragverhalten.
- Grundsätzlich sind aber auch Zwischenringe - mit konstanter Dicke entsprechend planparallelen Stirnflächen der Druckelemente, oder mit variabler Dicke, die den Formschrägen der Druckelemente angepasst wird - aus einem hoch druckfesten Kunststoff oder zum Beispiel einem Metallguss einsetzbar. In jedem Fall ist es aber erforderlich, dass die Zwischenelemente eine homogene Krafteintragung in die Druckelemente gewährleisten.
- Ebenso wichtig wie die gleichmäßige stirnseitige Einleitung der Längskraft in die Tragelemente des Druckrohres ist eine "harmonische" Weiterleitung im Inneren der Elemente. In Druckversuchen an Glaszylindern mit einer stirnseitigen Bettung in hochfestem Kunstharzmörtel ergaben sich überraschend große Unterschiede in der Tragkraft zwischen Zylindern mit geradliniger Wandung, die aus normalen Flaschen hergestellt, und solchen mit einer profilierten Wandung, die aus dem abgeschnittenen Mittelteil von Bier-Maßkrügen gewonnen worden waren. Infolge der vielfachen Umlenkungen und Richtungsänderungen des Kraftverlaufs in der profilierten Maßkrug-Wandung erreichte dort die Tragkraft, ungeachtet der größerer Materialdicke, nur einen geringen Bruchteil derjenigen der aus Flaschen hergestellten Zylinder.
- Deshalb wird bei der Formgebung der Profilierung des Druckrohres auf einen möglichst geradlinigen Kraftverlauf innerhalb der Wandung der Tragelemente geachtet, wenn auch, infolge der Einbettung des Druckrohres im Zementmörtel des Verpresskörpers und dessen seitlicher Stützung im Untergrund, ein günstiger Zentrierungseffekt auf die Längskräfte in den Tragelementen zu erwarten ist. Aus dem genannten Grund, und um zugleich bei vorgegebenem Außendurchmesser möglichst viel tragenden Querschnitt der Elemente zu haben, werden für die Profilierung nicht umlaufend durchgehende Querrillen in der äußeren Mantelfläche gewählt, sondern ein, auf die Mantelfläche bezogen, zweidimensionales Raster aus dicht aneinander gereihten Vertiefungen, beispielsweise in der Form kleiner "Hohlpyramiden" oder "-kegel". Zwischen den Vertiefungen bleiben dann jeweils noch tragende Rippen stehen, die, in Längsrichtung gesehen, sowohl den tragenden Querschnitt vergrößern als auch die ansonsten ständig wechselnde Exzentrizität der Kraftresultierenden abmindern, gleichsam "einfangen" und zugleich den tragenden Querschnitt vergrößern. Die Maßnahme ist so gut wie ohne Einfluss auf den für die Schubübertragung zu aktivierenden Anteil der Mantelfläche.
- Ein weiteres wichtiges Merkmal des erfindungsgemäßen Verpressankers ist die Unterbringung der für die Tragkraft der Anker bei schlechten Untergrundverhältnissen unverzichtbaren Nachverpressleitungen, die vorzugsweise in den Längsfugen der Halbschalen-Druckelemente eingebettet werden. Diese durch Injizierdrücke bis ca. 60 bar und mehr belastbaren HDPE-Leitungen deren Außendurchmesser mindestens 13, besser 16 mm betragen soll, dürfen über den Umfangskreis des Druckrohres nur minimal hinausragen, um nicht beim drehenden Ziehen der Bohrrohre beschädigt oder abgerissen zu werden. Die besagten Längsfugen sind nach außen V-förmig weit geöffnet, so dass das Aufsprengen des Primär-Verpresskörpers mit Druckwasser und das nachfolgende Austreten des Reinjektionsmörtels unbehindert möglich sind.
- Ein weiteres Merkmal des Ankers ist der zugfeste und druckdichte Anschluss des sogenannten Sammelhüllrohres, das den ansonsten nackten Litzenstrang auf seiner gesamten Länge umgibt, an die Grundplatte der Ankerfußkonstruktion. Die Grundplatte und der Anschluss sind so ausgebildet, dass das HDPE-Rohr ohne Änderung seines Durchmessers direkt bis an den Ankerfuß herangeführt werden kann, ohne dass infolge Raumbedarfs für eine Aufweitung tragender Querschnitt der hier am höchsten belasteten Druckrohrelemente verloren geht.
- Vorteilhaft können Teile der Ankerfußkonstruktion wie die Grundplatte und ein daran anschließendes zylindrisches Druckstück ebenfalls aus im Boden zerstörbaren Werkstoffen hergestellt werden, wie aus einem hoch druckfesten, aber ebenfalls spröden Glasfaser-Schichtpressstoff, um kein Hindernis für spätere Arbeiten mit Bodenfräsen darzustellen.
- Schließlich sind als Merkmal des Ankers noch die Spanndrähte zu erwähnen, die in je einer Innennute in den Druckelementen längs des gesamten Druckrohres verlaufen und dieses während des Transportes und des Einbaus der Anker durch eine Vorspannkraft geeigneter Größe in sich stabilisieren.
- Of greatest importance for the economy of the anchor is to minimize the outer diameter of the pressure pipe as much as possible, ie to achieve the highest possible utilization of the pressure pipe cross-section, so as to keep the required drill pipe diameter as small as possible. It must remain in the drill pipe inside always enough annulus for the unobstructed flow of Injiziermörtels during the injection process of the anchor, so that it is not the dreaded "blockages" and / or, while rotating pulling the drill pipes, for trapping solid particles in the narrow annulus between anchor and drill pipe and "take away" or "hogging" of the anchor can come.
- The achievable carrying capacity of a high-strength, but brittle material of the pressure tube elements without any ductility such as glass depends crucially on how smoothly and "trouble-free" the introduction of the longitudinal force takes place at the end faces of the support elements. Since no internal load relocations take place in the brittle material, locally high voltage spikes would arise, for example, at points of direct contact of the support elements with one another or with a foreign body of greater hardness in the joint, which would soon initiate the fracture and thus the premature failure of the pressure pipe. The most critical of all cross sections is the contact joint at the anchor foot, in which the entire anchor force must be absorbed without damage.
- A technically and economically advantageous solution to this problem is achieved in that during assembly of the pressure tube between the elements an axial annular gap defined Berebe is generated by interposing there spacer suitable dimensions and shape, for example, hard PVT. The gap then fills itself when cementing the anchor with cement mortar, which ensures in the front joints of the printing elements "ideally homogeneous" Bedungsbedingungen. It does not matter if the annular gap due to a production-related slope of the faces of 3 to 5 ° not a constant, but one variable along the circumference Has width. Expensive plane-parallel saw cuts on the front sides of the printing elements can be avoided.
- The plastic compression of the cement mortar in the face joints affects a slightly increased permanent displacement during load testing of the anchors, but has no influence on the load-bearing behavior.
- In principle, however, intermediate rings - with a constant thickness according to plane-parallel end faces of the printing elements, or with variable thickness, which is adapted to the draft of the printing elements - from a highly pressure-resistant plastic or, for example, a metal casting used. In any case, it is necessary that the intermediate elements ensure a homogeneous force entry into the pressure elements.
- Just as important as the uniform frontal introduction of the longitudinal force in the support elements of the pressure tube is a "harmonic" forwarding inside the elements. In compression tests on glass cylinders with an end-face bedding in high-strength synthetic resin mortar surprisingly large differences in the carrying capacity between cylinders with rectilinear walls made of normal bottles, and those with a profiled wall, which were obtained from the cut middle part of beer mugs , As a result of the multiple deflections and changes in direction of the force curve in the profiled Maßkrug wall reached there, the carrying capacity, regardless of the larger material thickness, only a small fraction of those of cylinders made of cylinders.
- Therefore, in the shaping of the profiling of the pressure tube attention to a linear force as possible within the wall of the support elements, albeit, due to the embedding of the pressure tube in the cement mortar of Verpresskörpers and its lateral support in the ground, a favorable centering effect on the longitudinal forces in the support elements is expected. For the above reason, and at the same time to have as much supporting cross-section of the elements for a given outer diameter, not continuous circumferential grooves are selected in the outer surface for profiling, but one, based on the lateral surface, two-dimensional grid of closely spaced wells, for example in the form of small "hollow pyramids" or "cones". Between the wells then still each supporting ribs remain, which, seen in the longitudinal direction, both increase the load-bearing cross-section and reduce the otherwise constantly changing eccentricity of the force resulting, as it were "capture" and at the same time increase the load-bearing cross-section. The measure is virtually without influence on the proportion of the lateral surface to be activated for the shear transfer.
- Another important feature of the grouting anchor according to the invention is the accommodation of the post-stress lines which are indispensable for the load-bearing capacity of the anchors under poor substrate conditions and which are preferably embedded in the longitudinal joints of the half-shell pressure elements. These HDPE pipes, which can be loaded by injecting pressures of up to approx. 60 bar and more and have an outer diameter of at least 13, preferably 16 mm, must protrude only minimally beyond the circumferential circle of the pressure pipe, so as not to be damaged or torn off during rotary pulling of the drill pipes. Said longitudinal joints are wide open to the outside V-shaped, so that the bursting of the primary Verpresskörpers with pressurized water and the subsequent emergence of Reinjektionsmörtels are unhindered possible.
- Another feature of the anchor is the tensile and pressure-tight connection of the so-called Sammelhüllrohres, which surrounds the otherwise bare stranded strand over its entire length, to the base plate of Ankerfußkonstruktion. The base plate and the connection are designed so that the HDPE pipe can be brought without changing its diameter directly to the anchor foot, without that due to space requirements for an expansion-carrying cross-section of the most heavily loaded here Pressure pipe elements is lost.
- Advantageously, parts of the Ankerfußkonstruktion as the base plate and an adjoining cylindrical pressure piece can also be made of destructible materials in the soil, such as a highly pressure-resistant, but also brittle fiberglass laminate to represent no obstacle to future work with soil tilling.
- Finally, as a feature of the anchor nor the tension wires to mention, each extending in an inner groove in the pressure elements along the entire pressure tube and this stabilize during transport and installation of the anchor by a biasing force of suitable size in itself.
Das nachfolgend beschriebene den Patentansprüchen 1 bis 5 zugrunde liegende Verfahren zum Lösen des Stahlzuggliedes von der Ankerfußkonstruktion ist eine zweite Ausgestaltung der Erfindung, die alleine oder in Verbindung mit der ersten, zuvor beschriebenen Ausgestaltung des im Boden zerstörbaren Druckrohres zum Einsatz kommen kann.The below-described method for releasing the Stahlzuggliedes of the Ankerfußkonstruktion underlying claims 1 to 5 is a second embodiment of the invention, which can be used alone or in conjunction with the first, previously described embodiment of destructible in the soil pressure tube.
Das Lösen kann auf zweierlei Art und Weise erfolgen. Bei beiden Methoden wird das Stahlzugglied in der Ankerfußscheibe, auch Keilträgerplatte genannt, mit Hilfe der an sich bekannten zwei- oder dreiteiligen sogenannten Segmentkeile verankert, die in dazu passenden konischen Bohrungen in der Scheibe sitzen und sich unter der Zugbelastung der Litzen mittels einer Innenverzahnung in diesen festbeißen.The release can be done in two ways. In both methods, the Stahlzugglied in Ankerfußscheibe, also called wedge carrier plate, anchored using the known two- or three-piece so-called segment wedges, sitting in matching conical holes in the disc and under the tensile load of the strands by means of internal teeth in this festbeißen.
Die erste der beiden Methoden spiegelt sich in den Patentansprüchen 1 bis 5 wieder und zeichnet sich dadurch aus, dass die Keilträgerplatte des Ankerfußes nicht, wie sonst üblich, monolithisch aus Stahl gefertigt ist. Sie besteht vielmehr nur in ihrem hoch auf Ringzug belasteten Randbereich und dem Boden - nach Art einer dickwandigen Büchse mit konischer Wandung - aus Stahl hoher Festigkeit, während der innere Bereich, in dem sich die Konusbohrung für die Keile befinden, aus einem nur mäßig zug- und druckfesten, aber bei relativ niedriger Temperatur schmelzbaren Werkstoff besteht.The first of the two methods is reflected in the claims 1 to 5 again and is characterized by the fact that the wedge carrier plate of the anchor foot is not, as usual, monolithically made of steel. Rather, it consists only in its highly loaded on Ringzug edge region and the bottom - in the manner of a thick-walled sleeve with conical wall - made of high-strength steel, while the inner region in which the conical bore for the wedges are consists of a only moderately tensile and pressure-resistant, but meltable at a relatively low temperature material.
Für den Ausbau des Zuggliedes genügt es dann, dem leicht schmelzbaren Kern der Ankerfußplatte eine ausreichende Menge Wärme zuzuführen, bis dieser zu schmelzen beginnt und die Segmentkeile ihre Haltefunktion für die Litzen verlieren, wodurch diese sich in der Regel unter der Ankerzugkraft von selbst lösen.For the expansion of the tension member, it is then sufficient to supply the easily fusible core of the Ankerfußplatte a sufficient amount of heat until it begins to melt and the segment wedges lose their holding function for the strands, causing them usually solve under the Ankerzugkraft by itself.
Als Werkstoff für den Kernbereich der Keilträgerplatte können Metalle wie Zink, Zinn, Aluminium, Magnesium etc. oder deren Legierungen, oder auch hoch druck- und kriechfeste Kunststoffe eingesetzt werden. Insbesondere kommen auch sogenannte eutektische Legierungen der oben genannten Metalle in Frage, bzw. solche, die durch das gewählte Mischungsverhältnis eine Optimierung erlauben zwischen der Druckfestigkeit, die möglichst hoch, und der Schmelztemperatur, die möglichst niedrig sein soll.As a material for the core region of the wedge carrier plate metals such as zinc, tin, aluminum, magnesium, etc. or their alloys, or high pressure and creep-resistant plastics can be used. In particular, so-called eutectic alloys of the abovementioned metals are also suitable, or those which allow optimization by the chosen mixing ratio between the compressive strength, which is as high as possible, and the melting temperature, which should be as low as possible.
Als kostengünstige und zuverlässige Wärmequellen für das Aufheizen des schmelzbaren Kernbereiches der Keilträgerplatte kommen vorrangig elektrische Heizelemente in Frage, die bevorzugt stabförmig in der Mittelachse in Form von Heizpatronen (aus dem Formen- und Werkzeugbau bekannt), oder beispielsweise flächenförmig oberhalb oder unterhalb der Platte angebrachte oder auch als Heizspiralen im Kern der Platte integriert werden können.As cost-effective and reliable heat sources for heating the fusible core portion of the wedge support plate are primarily electrical heating elements in question, preferably rod-shaped in the central axis in the form of heating cartridges (from the mold and tooling known), or for example, surface-mounted above or below the plate or Also as heating coils in the core of the plate can be integrated.
Bei der zweiten nicht von den Patentansprüchen 1 bis 5 umfassten Methode des Lösens des Stahlzuggliedes aus der Ankerfußkonstruktion kann als Wärmequelle ein alumino-thermischer Brandsatz ("Thermit") mit elektrischer Zündung eingesetzt werden, der bevorzugt hinter der Platte eingebaut werden kann. Ein solcher Brandsatz kann im gegebenen Fall so ausgeführt und dimensioniert werden, dass es genügt, die Keilträgerplatte monolithisch aus Stahl, ohne den leicht schmelzbaren Kernbereich herzustellen.In the second not covered by the claims 1 to 5 method of loosening the Stahlzuggliedes from Ankerfußkonstruktion can be used as a heat source alumino-thermal fire rate ("thermite") with electric ignition, which can be preferably installed behind the plate. In the given case, such an incendiary charge can be designed and dimensioned in such a way that it is sufficient to produce the wedge-carrier plate monolithically from steel without the easily fusible core region.
Hierfür ist es vorteilhaft, dem Reaktionsgemisch des Brandsatzes ein pyrotechnisches Treibmittel wie Kalzium- oder Magnesiumkarbonat zuzusetzen, um einen "Ausblaseffekt" des Brandsatzes zum Spannkanal hin zu erzeugen bzw. zu verstärken. Dieser Effekt bewirkt, dass die Litzen des Zuggliedes gezielt von den heißen Reaktionsgasen, in denen auch Anteile flüssiger Eisenschmelze mitgeführt werden können, im Sinne eines "Flammstrahles" getroffen und punktuell geschwächt bzw. durchtrennt werden, weshalb für diesen Zweck geeignete Kanäle in der Keilträgerplatte vorgesehen sind.For this purpose, it is advantageous to add a pyrotechnic propellant such as calcium or magnesium carbonate to the reaction mixture of the fire rate in order to produce or reinforce a "blow-out effect" of the fire rate to the clamping channel. This effect causes the strands of the tension member targeted by the hot reaction gases in which shares of liquid molten iron can be carried, met in the sense of a "flame jet" and selectively weakened or severed, which is why suitable channels provided in the wedge support plate for this purpose are.
Die Erfindung wird nachstehend anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher beschrieben, in der zeigen:
- Fig. 1
- eine Ansicht eines erfindungsgemäß ausgebildeten Ankers im Bohrloch,
- Fig. 2
- einen Längsschnitt durch ein erfindungsgemäß ausgebildetes Druckrohr im Bereich einer Kontaktfuge im Detail,
- Fig. 3
- einen Querschnitt entlang der Linie III-III durch das Druckrohr gemäß
Fig. 2 , - Fig. 4
- einen Längsschnitt durch das Druckrohr im Bereich des Anschlusses an den Ankerfuß,
- Fig. 5
- einen Längsschnitt durch die erfindungsgemäß ausgebildete Ankerfußkonstruktion mit schmelzbarem Kern,
- Fig. 6
- einen Querschnitt entlang der Linie VI-VI durch den Ankerfuß gemäß
Fig. 5 , - Fig. 7
- einen Längsschnitt durch die alternative Ausbildung des Ankerfußstückes aus monolithischem Stahl, mit einem unterhalb angeordneten Thermitbrandsatz mit elektrischer Zündung, und
- Fig. 8
- einen Querschnitt durch den Ankerfuß längs der Linie VIII-VIII in
Fig. 7 .
- Fig. 1
- a view of an inventive anchor formed in the borehole,
- Fig. 2
- a longitudinal section through an inventively designed pressure tube in the region of a contact joint in detail,
- Fig. 3
- a cross section along the line III-III through the pressure tube according to
Fig. 2 . - Fig. 4
- a longitudinal section through the pressure tube in the region of the connection to the anchor foot,
- Fig. 5
- a longitudinal section through the inventively designed Ankerfußkonstruktion with fusible core,
- Fig. 6
- a cross section along the line VI-VI through the anchor foot according to
Fig. 5 . - Fig. 7
- a longitudinal section through the alternative design of Ankerfußstückes monolithic steel, with a below arranged Thermitbrandsatz with electric ignition, and
- Fig. 8
- a cross section through the anchor foot along the line VIII-VIII in
Fig. 7 ,
Die
In
Das Zugglied 1 des Druckrohr-Verpressankers aus Spanndrahtlitzen 2 ist mittels der Segmentkeile 24 im Kernbereich 25 der Ankerfußplatte 23 verankert, der aus einer bei niedriger Temperatur schmelzbaren Metalllegierung besteht. Die Ankerfußplatte hat die Gestalt einer dickwandigen Büchse aus Stahl, deren Wandung 23a den Kernbereich 25 im Sinne eines Zugringes umschließt und die auftretenden plastischen Verformungen des weichen Metalls 25 unter den hohen radialen Reaktionskräften der Segmentkeile 24 "einfängt" und auf ein zulässiges Maß begrenzt.The tension member 1 of the pressure tube injection anchor made of
Das benötigte Heizelement für die Ankerfußplatte 23 wird in Form der axial angeordneten elektrischen Heizpatrone 26 gezeigt, mit dem Kabel 27 im Schutzrohr 27a als Stromzufuhr.The required heating element for the Ankerfußplatte 23 is shown in the form of the axially arranged
Das Ankerfußstück ist mit einem Deckel 28 nach hinten verschlossen und gibt über das Druckstück 21 und die Grundplatte 17 die Ankerzugkraft an das Druckrohr 4 bzw. 5, den Verpresskörper 7 und den Untergrund 8 weiter.The Ankerfußstück is closed with a
Durch den an der Grundplatte 17 fixierten Haltebügel 29 wird die gesamte Ankerfußkonstruktion zusammengehalten und mit dem Ankerzugglied fest verbunden.By fixed to the
Die Hohlräume 30 der Ankerfußkonstruktion sollen mit einer erprobten Korrosionsschutzmasse verfüllt werden, um mögliche korrosive Einwirkungen von den Nichteisen-Metallen des Kernbereichs 25 in Anwesenheit von Wasser auf den Spannstahl der Litzen 2 zuverlässig zu verhindern.The
Beim Einbau der Anker auf der Baustelle kann es zweckmäßig sein, nachdem Spannen und Festlegen des Ankers die Heizpatrone 26 kurzzeitig zu aktivieren, um mögliche Spalte, Lufteinschlüsse oder Hohlräume in der Vergussmasse infolge möglicher Bewegungen der Litzen und Keile beim Auf- und Abwickeln wie beim Spannen zu beseitigen.When installing the anchors on the site, it may be appropriate, after tightening and securing the anchor, the
Das wahlweise aus massivem Stahl gefertigte Ankerfußstück 31 ohne schmelzbaren Kernbereich ist mit dem Thermit-Brandsatz 32, dieser mit der elektrischen Zündvorrichtung 33 und der Stromzufuhr 27 im Schutzrohr 27a ausgestattet.The optionally made of
Die Wirkung des Brandsatzes 32 kann bevorzugt durch den Zusatz eines pyrotechnischen Treibmittels im Reaktionsgemisch verstärkt werden, um einen hoch wirksamen "Ausblaseffekt" zu erzeugen.The effect of the
Im Ankerfußstück 31 sind entlang der Konusbohrungen für die Verankerungskeile 24 Kanäle 34 vorgesehen (in
Die Funktion der Kanäle 34 kann im gegebenen Fall durch die Spalte 35 zwischen den Keilsegmenten 24 verstärkt oder auch zur Gänze übernommen werden.The function of the
Um die verdämmende Wirkung von ins Hüllrohr eingedrungenem Wasser abzumindern, kann es zweckmäßig sein, den unteren, dem Ankerfuß vorgelagerten Bereich des Spannkanals 36 mit einem nicht oder nur wenig wärmebeständigen Schaum zu verfüllen, der einerseits Wasser fernhält, andererseits aber den heißen Reaktionsgasen keinen hohen Widerstand bietet.In order to mitigate the damming effect of penetrated into the cladding tube water, it may be appropriate to fill the lower, the anchor base portion of the clamping
Claims (5)
- A retrievable temporary pressure-grouted anchor with- a pressure tube (4) which can be destroyed in the ground,- a steel tension member (1) consisting of prestressing steel strands (2) and- an anchoring base structure (9) at the lower end of the pressure tube, wherein the anchoring base structure (9) has an anchoring base section with tapered bores which are intended to accommodate segmented wedges (24), by means of which the tension member (1) is anchored in the anchoring base section,- and with an externally activatable heat source (26),characterised in that the anchoring base section consists of a thick-walled sleeve (23a), the walls of which surround an inner zone (25), wherein the zone (25) consists of a relatively soft metal, which can melt at temperatures between approximately 60°C and approximately 500°C, or of a suitable plastics material with high strength and high creep resistance, and in which the tapered bores are arranged to accommodate the segmented wedges (24), and in that there is arranged, in as direct as possible contact with the inner zone (25), the externally activatable heat source (26) with which the inner zone (25) can be heated to a temperature above its melting point.
- A pressure-grouted anchor according to Claim 1, characterised in that the sleeve (23) consists of steel.
- A pressure-grouted anchor according to Claim 1 or 2, characterised in that the meltable inner zone (25) consists of zinc, tin, lead, magnesium, cadmium, etc., or of alloys thereof, in particular zinc in alloy with 5.6 to 6 % aluminium and 1.2 to 1.5 % copper, or of the so-called Wood's metal, composed of 50 % bismuth, 25 % lead, respectively 12.5 % tin and cadmium, or of a highly pressure-resistant and very creep-resistant plastics material.
- A pressure-grouted anchor according to any one of Claims 1 to 3, characterised in that as heat source there is provided an axially arranged electrical cartridge heater (26) with a current supply (27) disposed in a protective tube (27a).
- A pressure-grouted anchor according to any one of Claims 1 to 4, characterised in that, to obviate corrosive processes in the prestressing steel strands (2) owing to presence of water and, at the same time, the spatial proximity of metallic zinc or other non-ferrous metals of the core zone (25), the entire anchoring base section (23) is cast internally with a hot-fluid corrosion inhibiting compound which, for example, is customarily used in ground anchor technology.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04020952A EP1486617A1 (en) | 2000-05-08 | 2001-05-08 | Recoverable injection anchor |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10022273 | 2000-05-08 | ||
DE10022273 | 2000-05-08 | ||
DE10032591 | 2000-07-07 | ||
DE10032712 | 2000-07-07 | ||
DE10032591 | 2000-07-07 | ||
DE10032712 | 2000-07-07 | ||
DE10047655 | 2000-09-26 | ||
DE10047655 | 2000-09-26 | ||
DE10106387 | 2001-02-12 | ||
DE10106387 | 2001-02-12 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04020952A Division EP1486617A1 (en) | 2000-05-08 | 2001-05-08 | Recoverable injection anchor |
EP04020952.0 Division-Into | 2004-09-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1154077A1 EP1154077A1 (en) | 2001-11-14 |
EP1154077B1 true EP1154077B1 (en) | 2010-08-04 |
Family
ID=27512374
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04020952A Withdrawn EP1486617A1 (en) | 2000-05-08 | 2001-05-08 | Recoverable injection anchor |
EP01111051A Expired - Lifetime EP1154077B1 (en) | 2000-05-08 | 2001-05-08 | Recoverable injection anchor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04020952A Withdrawn EP1486617A1 (en) | 2000-05-08 | 2001-05-08 | Recoverable injection anchor |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP1486617A1 (en) |
AT (1) | ATE476557T1 (en) |
DE (1) | DE50115578D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3336259A1 (en) | 2016-12-16 | 2018-06-20 | Stahlton AG | Anchor for anchoring in the ground and/or rock with reversible tension member |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202010004381U1 (en) | 2010-03-30 | 2010-08-12 | Dywidag-Systems International Gmbh | Pressure tube and ground anchor made therefrom |
CN103362124A (en) * | 2013-07-17 | 2013-10-23 | 重庆岩安科技有限公司 | Recoverable anchor cable for civil engineering |
CN103898905B (en) * | 2014-04-24 | 2016-04-27 | 四川盛唐建设工程有限公司 | Composite high-strength anchor cable |
CN111997048B (en) * | 2020-07-03 | 2021-09-17 | 中北大学 | Multifunctional recyclable anchor rod or anchor cable |
CN112459058A (en) * | 2020-12-07 | 2021-03-09 | 中建八局第四建设有限公司 | Echelon pressurizing grouting anchor rod and construction method thereof |
CN114657983B (en) * | 2022-04-07 | 2023-03-21 | 成都理工大学 | Recyclable intelligent anchoring device and recycling method thereof |
CN115419076B (en) * | 2022-05-30 | 2024-06-25 | 中冶建工集团有限公司 | High-pressure rotary spraying recyclable anchor cable supporting construction method for deep foundation pit |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2353652C2 (en) | 1973-10-26 | 1983-03-24 | Karl Bauer Spezialtiefbau GmbH & Co KG, 8898 Schrobenhausen | Removable grouted anchor with lost anchor body |
CH585820A5 (en) * | 1974-12-24 | 1977-03-15 | Stump Bohr Ag | |
CH663237A5 (en) * | 1984-03-19 | 1987-11-30 | Dyckerhoff & Widmann Ag | DEVICE FOR DISCONNECTING THE TENSION OF A PRELOADED PRESSURE ANCHOR. |
JPH04143312A (en) | 1990-10-04 | 1992-05-18 | Nittoc Constr Co Ltd | Anchor removing method |
NL9102004A (en) | 1991-11-29 | 1993-06-16 | Hollandsche Betongroep Nv | METHOD FOR APPLYING AN ANCHOR FOR ANCHORING GROUND-EMPTYING WALLS, CONSTRUCTION WORKS, SHORTER BLOCKS, FRAME WALLS AND THE LIKE. |
FR2708948B1 (en) * | 1993-08-09 | 1995-11-03 | Bouygues Sa | Method for facilitating the extraction of the reinforcement from a prestressed tie and corresponding tie. |
JP3759232B2 (en) * | 1996-03-25 | 2006-03-22 | 三信建設工業株式会社 | Removal anchor device |
-
2001
- 2001-05-08 AT AT01111051T patent/ATE476557T1/en active
- 2001-05-08 EP EP04020952A patent/EP1486617A1/en not_active Withdrawn
- 2001-05-08 EP EP01111051A patent/EP1154077B1/en not_active Expired - Lifetime
- 2001-05-08 DE DE50115578T patent/DE50115578D1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3336259A1 (en) | 2016-12-16 | 2018-06-20 | Stahlton AG | Anchor for anchoring in the ground and/or rock with reversible tension member |
Also Published As
Publication number | Publication date |
---|---|
DE50115578D1 (en) | 2010-09-16 |
EP1486617A1 (en) | 2004-12-15 |
EP1154077A1 (en) | 2001-11-14 |
ATE476557T1 (en) | 2010-08-15 |
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