EP0899382B1 - Elément d'ancrage d'un tirant ancrage - Google Patents

Elément d'ancrage d'un tirant ancrage Download PDF

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Publication number
EP0899382B1
EP0899382B1 EP98115700A EP98115700A EP0899382B1 EP 0899382 B1 EP0899382 B1 EP 0899382B1 EP 98115700 A EP98115700 A EP 98115700A EP 98115700 A EP98115700 A EP 98115700A EP 0899382 B1 EP0899382 B1 EP 0899382B1
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EP
European Patent Office
Prior art keywords
anchor element
element according
anchor
bundle
sheathing tube
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
Application number
EP98115700A
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German (de)
English (en)
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EP0899382A1 (fr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Walter Bau AG
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Walter Bau AG
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Publication date
Application filed by Walter Bau AG filed Critical Walter Bau AG
Publication of EP0899382A1 publication Critical patent/EP0899382A1/fr
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Publication of EP0899382B1 publication Critical patent/EP0899382B1/fr
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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 compression 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.
  • L V bonded length
  • L F free steel length
  • 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 ).
  • L F free steel length
  • 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 in the area of the bond length Lv; they are here determined to be embedded in the grout.
  • the strands 3 are spread apart at certain intervals; there are at the same time spacer 4 is arranged, the centering of the tension member 2 in Effect borehole. Between the spreads in the area of the spacers 4 the strands 3 are held together by straps 5.
  • 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 placed 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.

Claims (11)

  1. Elément d'ancrage pour un tirant d'ancrage scellé de préférence provisoire, dans lequel l'armature du tirant d'ancrage se compose d'un faisceau de tirants individuels, en particulier des torons en fil d'acier, qui sont enrobés dans un corps de scellement dans la zone de la longueur du scellement (Lv) et qui peuvent se dilater librement dans la zone de la longueur libre du tirant, l'armature du tirant étant entièrement entourée d'une gaine dans la zone de la longueur libre (LF), caractérisé en ce qu'aussi bien à son extrémité inférieure comprenant une forure (8) qu'à son extrémité supérieure libre (10) la cavité creuse formée par la gaine (6) et entourant le tirant (2) est fermée de manière étanche par des joints (9, 11), le joint inférieur (9) et/ou le joint supérieur (11) se composant, au moins dans la cavité circulaire formée entre le faisceau de tirants individuels (3) et la gaine (6), d'un matériau se durcissant et la gaine (6) étant respectivement fermement entourée, aux deux extrémités au moins, du joint inférieur (9) d'une bande de serrage (16) formant des rétrécissements (15) de la gaine (6).
  2. Elément d'ancrage selon la revendication 1, caractérisé en ce que le joint inférieur (9) et/ou le joint supérieur (11) se composent d'un sac de garniture injectable en fibres assemblées entourant le faisceau (2) et ' comprenant un matériau se durcissant, en particulier du mortier de ciment.
  3. Elément d'ancrage selon la revendication 2, caractérisé en ce que, dans la zone du joint, les interstices entre les différents éléments du faisceau sont remplis d'un matériau d'étanchéité.
  4. Elément d'ancrage selon la revendication 1, caractérisé en ce que le joint inférieur (9) se compose d'une couche (14) d'un matériau se durcissant, en particulier du mortier de ciment, qui entoure les différents éléments (3) du faisceau (2) et qui est enrobée dans une couche de fibres assemblées (13) s'appuyant sur la paroi intérieure de la gaine.
  5. Elément d'ancrage selon la revendication 1 ou selon les revendications 3 ou 4, caractérisé en ce que le joint supérieur (11) se compose d'un tampon (19) en matériau dur, par exemple du béton de fibres durci.
  6. Elément d'ancrage selon la revendication 5, caractérisé en ce que le tampon (19) a une forme de double cône tronqué.
  7. Elément d'ancrage selon la revendication 5 ou 6, caractérisé en ce que le tampon (19) comprend une forure axiale (21) traversée par un tube de raccord fileté (22) aboutissant dans la cavité creuse de la gaine (6).
  8. Elément d'ancrage selon la revendication 7, caractérisé en ce que le tube de raccord fileté (22) est traversé par une conduite d'alimentation, par exemple pour une alimentation en eau.
  9. Elément d'ancrage selon l'une des revendications 1 à 8, caractérisé en ce que, du côté libre, la gaine (6) dépasse de l'extrémité (7) du faisceau (2) et en ce que le joint supérieur (11) est disposé dans la zone en dépassement.
  10. Elément d'ancrage selon l'une des revendications 1 à 9, caractérisé en ce que la gaine (6) se compose de matériau synthétique, en particulier de polyéthylène haute densité (PEHD).
  11. Elément d'ancrage selon l'une des revendications 1 à 10, caractérisé en ce que les fibres assemblées (13) se composent de fibres en matière synthétique, en particulier en polyester.
EP98115700A 1997-08-27 1998-08-20 Elément d'ancrage d'un tirant ancrage Expired - Lifetime EP0899382B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29715363U 1997-08-27
DE29715363U DE29715363U1 (de) 1997-08-27 1997-08-27 Ankerelement für einen Verpreßanker

Publications (2)

Publication Number Publication Date
EP0899382A1 EP0899382A1 (fr) 1999-03-03
EP0899382B1 true EP0899382B1 (fr) 2002-04-03

Family

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EP98115700A Expired - Lifetime EP0899382B1 (fr) 1997-08-27 1998-08-20 Elément d'ancrage d'un tirant ancrage

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EP (1) EP0899382B1 (fr)
AT (1) ATE215645T1 (fr)
DE (2) DE29715363U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019140492A1 (fr) * 2018-01-22 2019-07-25 Garock Pty Ltd Perfectionnements apportés aux boulons d'ancrage ou s'y rapportant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH583340A5 (fr) 1974-06-19 1976-12-31 Losinger Ag
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
DE3431211A1 (de) * 1984-08-24 1986-03-06 Stump Bohr Gmbh, 8045 Ismaning Mehrstahlanker
ATE52290T1 (de) * 1985-08-26 1990-05-15 Vorspann Technik Gmbh 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019140492A1 (fr) * 2018-01-22 2019-07-25 Garock Pty Ltd Perfectionnements apportés aux boulons d'ancrage ou s'y rapportant

Also Published As

Publication number Publication date
DE59803589D1 (de) 2002-05-08
EP0899382A1 (fr) 1999-03-03
DE29715363U1 (de) 1997-11-27
ATE215645T1 (de) 2002-04-15

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