EP0899382A1 - Ankerelement für einen Verpressanker - Google Patents
Ankerelement für einen Verpressanker Download PDFInfo
- Publication number
- EP0899382A1 EP0899382A1 EP98115700A EP98115700A EP0899382A1 EP 0899382 A1 EP0899382 A1 EP 0899382A1 EP 98115700 A EP98115700 A EP 98115700A EP 98115700 A EP98115700 A EP 98115700A EP 0899382 A1 EP0899382 A1 EP 0899382A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cladding tube
- anchor element
- bundle
- element according
- anchor
- 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.)
- Granted
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
Definitions
- the invention relates to an anchor element for a preferably temporary Compression anchor according to the preamble of claim 1.
- a grouting anchor consists of an anchor element which is inserted into a borehole and deepened in the borehole by a grouting body produced by pressing in hardening material, such as cement mortar or the like, is connected to the borehole wall and thus to the surrounding soil.
- This pressing body is non-positively connected to the component to be anchored via the remaining part of the anchor element, which generally consists of a bundle of individual tension members, in particular strands made of steel wires.
- the part of the length of the anchor element over which it is embedded in the compression body is called the composite length (L V ), the remaining part, which is freely stretchable for the purpose of prestressing, is the free steel length (L F ).
- Grouting anchors can be used to permanently anchor structures in the ground serve, but also for temporary purposes, i.e. temporarily used, such as in particular for anchoring an excavation wall backwards. If a temporarily inserted grouting anchor into a neighboring property extends, he must often after completion of the construction work for which he is deployed was removed.
- a separating option for the tension member is usually provided at the transition from the bonded length (L V ) to the free steel length (L F ) so that the freely stretchable part of the tension member can be pulled out of the borehole.
- the tension member at the point in question is weakened before installation to create a predetermined breaking point
- the tension member is provided with a device during installation at the separation point, with the aid of which it can be weakened after installation and use. In both cases a break is caused by the application of a tensile force that exceeds the working load.
- Another possibility to remove the tension member is to install an empty pipe together with the tension member of the anchor in the borehole, into which an explosive charge is inserted in the area of the bond length (L V ). By igniting this explosive charge, the compression body is destroyed so that the tension member can be pulled out of the borehole with little force.
- anchor tension members for temporary anchors are not subject to any significant corrosion stresses, they are usually not piped in the area of the free steel length (L F ).
- anchors made of steel wire strands are often individually strands coated with PE, which are fanned out from a relatively dense order in the area of the free steel length to the anchor head in order to be anchored there in an anchor plate.
- the invention is based on the object Possibility to create friction losses when clamping a to minimize the generic anchor element in the area of the free steel length and the expandability of the anchor tension member after cutting or ignition to guarantee an explosive charge in any case.
- the basic idea of the invention is not only the individual elements of the Bundle tension member in the area of the free steel length within a surrounding to lead common cladding tube, which creates the risk of entrainment between the drill pipe and the bundle of strands when pulling the Drill pipe is reduced, but especially in that through this Cladding tube formed cavity both on the lower borehole side, and on upper air-side end of the cladding tube is sealed.
- Fig. 1 shows a partial longitudinal section through an inventive formed anchor element 1.
- the anchor element 1 comprises an anchor tension member 2, which is formed by a bundle of steel wire strands 3.
- the strands 3 are bare; here they are intended to be embedded in the compact.
- the strands 3 are spread apart from one another at certain intervals; there are at the same time spacers 4 which center the tension member 2 in the borehole.
- the strands 3 are held together by straps 5 between the spreads in the area of the spacers 4.
- the anchor tension member 2 is surrounded by a stable cladding tube 6 made of plastic, preferably made of HDPE.
- the cladding tube 6 extends beyond the air-side upper ends 7 of the strands 3.
- the cladding tube 6 is sealed at the lower end 8 on the borehole side by a lower seal 9 and at the upper end 10 on the air side by an upper seal 11.
- the anchor element 1 assembled in this way which can also have a post-grouting line 12 for injecting cement mortar into the area of the bond length L V for producing the grouting body, is lowered into a borehole in this state.
- FIGS. 2 and 3 show a larger scale.
- FIG. 2 shows a longitudinal section
- FIG. 3 shows a cross section along the line III-III in FIG. 2.
- a rigid cement mortar 14 is applied to a correspondingly large strip of a polyester nonwoven 13. This arrangement is brought under the strand bundle 2.
- the cement mortar is distributed around the individual strands 3 and between them by turning up the ends of the nonwoven band 13.
- the fleece tape 13 is then wrapped around the strand of strands 2, enclosing the cement mortar.
- the cladding tube 6 which has already been pushed over the area of the free steel length L F is then pushed over the cuff formed in this way.
- the cladding tube 6 is in the area in which the polyester fleece 13 and the cement mortar 14 are heated, e.g. by a gas flame, and then in the end regions, constrictions 15 forming, each surrounded by a steel band 16. This will make the Cement mortar 14 formed into a solid plug and thus a very reliable Sealing reached.
- the ends of the polyester fleece 13 can still by Adhesive tape 17 to be attached to the strand bundle 2.
- the constrictions 15 create the end of the cladding tube 6 at the borehole end a tensile connection between this and the anchor tension member 2. This has the advantage that for making any length corrections to the anchor tension member 2 can also be attacked on the air-side end on the cladding tube 6 without to fear that this slides along the anchor pull member 2.
- Anchor tension member 2 that is to say predetermined breaking point 18 arranged in the area on the strand bundle to provide the lower seal 9 because this point is particularly good there Corrosion is protected.
- the upper seal arranged on the air-side upper end 10 of the cladding tube 6 11 can basically be designed in the same way as the lower one Seal 9. It seems particularly useful, however, the cladding tube 6 on the Let ends 7 of the strands 3 protrude. This creates the prerequisite for the fact that as a top seal 11 a plug 19 from a fixed Material such as Hardwood, fiber concrete or the like can be used.
- the plug 19 has, as shown in Fig. 2, truncated cone-shaped Shape such that it has a thickening in the central region of its axial length 20 forms.
- the diameter of the plug 19 becomes the diameter of the cladding tube 6 so that it is heated by the cladding tube 6 of whose front end can be driven in and by the Cooling again hardening cladding tube 6 is held in this position.
- the plug 19 expediently has an axial bore 21 which a nipple 22 is penetrated, on the outer end of a sleeve 23 and inner end of a lock nut 24 are screwed on.
- the opening on the sleeve 23 can be closed by a stopper 25.
- Through the nipple 22 can Filling hose 26 are guided through which, for example, water into the Seals 9 and 11 sealed cavity of the cladding tube 6 are filled can.
- the cavity is filled with water before the Drill hole with hardening material so as to prevent the cladding tube 6 is dented due to external pressure and so the subsequent tensioning and Removing the anchor tension member 2 is hindered.
- the anchor element 1 is in the form described in a for example, a well drilled in the protection of a drill pipe, so that the upper end 9 of the cladding tube 6 protrudes from the borehole on the air side.
- the individual strands 3 of the anchor tension member 2 are against influences protected from the outside, especially against the fact that when pulling the rotating Drill pipe and penetration of a water-sand mixture of the undesirable Driving and stranding effect between the drill pipe and the tension member of the Anchor can occur.
- the water filling of the cladding tube 6 prevents Dent.
- the cladding tube 6 is cut off at the air-side end of the anchor element, so that the ends 7 of the strand bundle 2 are accessible and anchored in the usual manner in an anchoring device can be
Landscapes
- 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)
- Joining Of Building Structures In Genera (AREA)
- Dowels (AREA)
Abstract
Description
- Fig. 1
- einen teilweisen Längsschnitt durch ein Ankerelement gemäß der Erfindung,
- Fig. 2
- einen Längsschnitt durch den Bereich der freien Stahllänge (LF) des Ankerelements in größerem Maßstab und
- Fig. 3
- einen Querschnitt entlang der Linie III-III in Fig. 2.
Claims (11)
- Ankerelement für einen vorzugsweise temporären Verpreßanker, bei dem das Ankerzugglied aus einem Bündel von Einzelzuggliedern, insbesondere Litzen aus Stahldraht, besteht, die im Bereich der Verbundlänge (LV) in einen Verpreßkörper eingebettet und im Bereich der freien Stahllänge (LF) frei dehnbar sind, wobei das Zugglied im Bereich der freien Stahllänge (LF) insgesamt von einem Hüllrohr umgeben ist, dadurch gekennzeichnet, daß der von dem Hüllrohr (6) gebildete, das Zugglied (2) umschließende Hohlraum sowohl an dessen bohrlochseitigem unteren (8), als auch an dessen luftseitigem oberen Ende (10) durch Dichtungen (9,11) dichtend abgeschlossen ist, wobei die untere (9) und/oder obere Dichtung (11) zumindest in dem zwischen dem Bündel aus Einzelzuggliedern (3) und dem Hüllrohr (6) gebildeten Ringraum aus einem erhärtenden Material bestehen und das Hüllrohr (6) an den beiden Enden zumindest der unteren Dichtung (9) jeweils von einem Einschnürungen (15) des Hüllrohrs (6) bildenden Spannband (16) fest umschlossen ist.
- Ankerelement nach Anspruch 1, dadurch gekennzeichnet, daß die untere (9) und/oder die obere Dichtung (11) aus einem das Bündel (2) umgebenden, mit einem erhärtenden Material, insbesondere Zementmörtel, injizierbaren Packersack aus einem Vlies bestehen.
- Ankerelement nach Anspruch 2, dadurch gekennzeichnet, daß die Zwischenräume zwischen den Einzelelementen des Bündels im Bereich der Dichtung von einem dichtenden Material ausgefüllt sind.
- Ankerelement nach Anspruch 1, dadurch gekennzeichnet, daß die untere Dichtung (9) aus einer die Einzelelemente (3) des Bündels (2) umgebenden Lage (14) eines erhärtenden Materials, insbesondere Zementmörtel, besteht, die von einer an der Innenwand des Hüllrohrs anliegenden Vlieslage (13) umschlossen ist.
- Ankerelement nach Anspruch 1 oder nach den Ansprüchen 3 oder 4, dadurch gekennzeichnet, daß die obere Dichtung (11) aus einem Pfropfen (19) aus einem festen Material, z.B. erhärtetem Faserbeton, besteht.
- Ankerelement nach Anspruch 5, dadurch gekennzeichnet, daß der Pfropfen (19) eine doppelkegelstumpfförmige Gestalt aufweist.
- Ankerelement nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß der Pfropfen (19) eine, von einem in den Hohlraum des Hüllrohrs (6) führenden Nippel (22) durchsetzte axiale Bohrung (21) aufweist.
- Ankerelement nach Anspruch 7, dadurch gekennzeichnet, daß durch den Nippel (22) eine Zuführleitung, z.B. für Wasser, hindurchgeführt ist.
- Ankerelement nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Hüllrohr (6) am luftseitigen Ende über das Ende (7) des Bündels (2) hinausragt und daß die obere Dichtung (11) in dem hinausragenden Bereich angeordnet ist.
- Ankerelement nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Hüllrohr (6) aus Kunststoff, insbesondere aus HDPE, besteht.
- Ankerelement nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß das Vlies (13) aus Kunststoffasern, insbesondere aus Polyester, besteht.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29715363U DE29715363U1 (de) | 1997-08-27 | 1997-08-27 | Ankerelement für einen Verpreßanker |
DE29715363U | 1997-08-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0899382A1 true EP0899382A1 (de) | 1999-03-03 |
EP0899382B1 EP0899382B1 (de) | 2002-04-03 |
Family
ID=8045165
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98115700A Expired - Lifetime EP0899382B1 (de) | 1997-08-27 | 1998-08-20 | Ankerelement für einen Verpressanker |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0899382B1 (de) |
AT (1) | ATE215645T1 (de) |
DE (2) | DE29715363U1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100453743C (zh) * | 2006-06-05 | 2009-01-21 | 吴德兴 | 一种预应力锚杆装置 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29911830U1 (de) | 1999-07-07 | 1999-09-30 | Suspa Spannbeton Gmbh, 40764 Langenfeld | Litzenförmiges Zugelement, insbesondere für die Bautechnik |
WO2019140492A1 (en) * | 2018-01-22 | 2019-07-25 | Garock Pty Ltd | Improvements in or relating to rock bolts |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT360431B (de) | 1974-06-19 | 1980-01-12 | Losinger Ag | Verfahren und vorrichtung zum ausbau eines im boden verankerten und vorgespannten stahl- buendelankers |
DE3431211A1 (de) * | 1984-08-24 | 1986-03-06 | Stump Bohr Gmbh, 8045 Ismaning | Mehrstahlanker |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2511863C3 (de) * | 1975-03-18 | 1980-01-03 | Dyckerhoff & Widmann Ag, 8000 Muenchen | Korrosionsgeschütztes Zugglied für einen vorgespannten Verpreßanker |
DE3116619C2 (de) * | 1981-04-27 | 1983-07-28 | Josef 6943 Birkenau Compernaß | Verpreßanker, insbesondere Daueranker |
EP0220161B1 (de) * | 1985-08-26 | 1990-04-25 | Vorspann-Technik Gesellschaft m.b.H. | Anker, insbesondere Freispielanker |
DE3844417C2 (de) * | 1988-12-30 | 1995-02-16 | Tgb Technogrundbau Gmbh | Verfahren zum Herstellen eines nachspannbaren Verpreßankers mit Dauerkorrosionsschutz sowie dadurch hergestellter Verpreßanker |
-
1997
- 1997-08-27 DE DE29715363U patent/DE29715363U1/de not_active Expired - Lifetime
-
1998
- 1998-08-20 DE DE59803589T patent/DE59803589D1/de not_active Expired - Fee Related
- 1998-08-20 AT AT98115700T patent/ATE215645T1/de not_active IP Right Cessation
- 1998-08-20 EP EP98115700A patent/EP0899382B1/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT360431B (de) | 1974-06-19 | 1980-01-12 | Losinger Ag | Verfahren und vorrichtung zum ausbau eines im boden verankerten und vorgespannten stahl- buendelankers |
DE3431211A1 (de) * | 1984-08-24 | 1986-03-06 | Stump Bohr Gmbh, 8045 Ismaning | Mehrstahlanker |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100453743C (zh) * | 2006-06-05 | 2009-01-21 | 吴德兴 | 一种预应力锚杆装置 |
Also Published As
Publication number | Publication date |
---|---|
DE29715363U1 (de) | 1997-11-27 |
EP0899382B1 (de) | 2002-04-03 |
DE59803589D1 (de) | 2002-05-08 |
ATE215645T1 (de) | 2002-04-15 |
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