EP0638689B1 - Procédé pour faciliter l'extraction de l'armature d'un tirant précontraint et tirant correspondant - Google Patents
Procédé pour faciliter l'extraction de l'armature d'un tirant précontraint et tirant correspondant Download PDFInfo
- Publication number
- EP0638689B1 EP0638689B1 EP94401824A EP94401824A EP0638689B1 EP 0638689 B1 EP0638689 B1 EP 0638689B1 EP 94401824 A EP94401824 A EP 94401824A EP 94401824 A EP94401824 A EP 94401824A EP 0638689 B1 EP0638689 B1 EP 0638689B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- reinforcement
- ground
- tension
- prestressing
- 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
- 230000002787 reinforcement Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims description 7
- 238000000605 extraction Methods 0.000 title claims description 3
- 239000011440 grout Substances 0.000 claims description 16
- 239000003365 glass fiber Substances 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 11
- 239000002002 slurry Substances 0.000 abstract 1
- 239000004459 forage Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 241001639412 Verres Species 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 240000008042 Zea mays Species 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
Definitions
- the invention relates to an anchor of the type comprising a longitudinal reinforcement, one end of which is pressed into the ground and sealed to the ground by a hardened mass of a grout of sealing and the opposite end of which is stressed by means of tension to prestress the tie rod and which has a tube around the frame.
- Publication DE-B- 2 606 095 provides for this purpose to fix the armature to an anchor body capable of being destroyed by a force of shear exerted transversely.
- the tube placed around the frame is a tube intended to ensure sealing.
- the present invention aims to facilitate the extraction of the armature by simple tensile forces.
- the tube used according to publication CH-A-5 09476 is also incorporated into the concrete grout before setting and able to withstand prestressing traction.
- the tie rod of the present invention differs from the tie rod described in this publication in that the tube is constructed in such a way that its wall be put in tension without breaking under the effect of prestressing of the reinforcement, ensuring the transition of the tensile force from the tie rod to land during the service phase, and is capable of being broken by a traction exerted on the reinforcement greater than the prestressing traction but insufficient to break the frame.
- the frame is for example constituted by a bar or a bundle of strands.
- the sealing tube is advantageously a fiber tube glass which ensures continuity of the seal between the reinforcement and the ground and thus, ensure the transition of the effort of pulling the tie rod to the ground during the service phase.
- the tensile force of the tie rod goes from the reinforcement to the tube in glass fibers by covering, pulling the latter by a value close to that of the force applied in the reinforcement.
- the tensile force exerted on the glass fiber tube is subsequently disseminated in the field by the sealing bulb created around the tube.
- the fiberglass tube is thus the weak link of a sealing chain whose continuity can be broken by destruction of the material of which it is composed.
- the armature is dimensioned so that the value of the traction of the reinforcement is greater than that of the fiber tube glass.
- the glass fiber tube 2 has been fixed to the frame 6 prior to the introduction of the tube and the reinforcement in the borehole.
- the grout for fixing the tube to the ground can no longer be introduced from inside the tube and it is introduced by an injection tube 9 outside the tube 2.
- the glass fiber tube is replaced by plastic tubes with equivalent properties for the use considered.
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)
- Reinforcement Elements For Buildings (AREA)
- Package Frames And Binding Bands (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
- on réalise dans le terrain un forage 1 ayant la longueur voulue pour l'ancrage ;
- on met en place dans ce forage un tube 2 en fibres de verre, sur tout ou partie de la longueur du forage. En fait, ce tube n'est nécessaire que dans la région prévue pour le scellement au terrain de l'extrémité inférieure de l'armature du tirant. Dans l'exemple considéré, le tube en fibres de verre ne s'étend pas sur toute la longueur du forage mais seulement sur la partie inférieure du forage et il est prolongé vers le haut par un tube de protection 3 ;
- on injecte un coulis de ciment dans le tube 2 en sorte que ce coulis traverse le tube par une série de manchettes 4 et remplisse l'espace 5 compris entre le tube et le forage.
- avant cette injection ou avant que le coulis n'ait fait sa prise, on enfonce l'armature 6 dans le forage 1 jusqu'à ce que l'extrémité inférieure 6a de l'armature ait pénétrée dans le tube 2 sur une longueur suffisante. Le coulis d'injection assure d'une part la fixation du tube 2 à la paroi du forage et, d'autre part, la fixation de l'armature à ce tube, en sorte que tout se passe comme si l'armature était fixée au forage par l'intermédiaire d'un bloc de ciment comportant autour de l'armature un cylindre de moindre résistance à la traction constitué par le tube en fibres de verre. On met en place autour de l'autre extrémité 6b de l'armature, un dispositif de précontrainte traditionnel constitué, par exemple par une plaque de répartition 7 appuyée sur le terrain et un écrou 8 coopérant avec une partie filetée de cette extrémité.
Claims (8)
- Procédé pour faciliter, après service, l'extraction de l'armature d'un tirant d'ancrage comprenant une armature longitudinale (6) dont une extrémité est enfoncée dans le terrain et scellée au terrain par une masse durcie d'un coulis de scellement et dont l'extrémité opposée est sollicitée par des moyens de traction pour précontraindre le tirant, le tirant comportant un tube (2) autour de l'armature, caractérisé en ce qu'on incorpore le tube au coulis de scellement, avant sa prise, en sorte que le tube assure la continuité de scellement entre l'armature et le terrain, ledit tube étant choisi pour résister à la traction de précontrainte et apte à être rompu par une traction supérieure à la traction de précontrainte mais insuffisante pour rompre l'armature (6).
- Procédé selon la revendication 1, caractérisé en ce qu'on met en place ledit tube (2) dans un forage (1) du terrain avant d'introduire l'armature (6) dans le tube.
- Procédé selon la revendication 2, caractérisé en ce qu'on scelle le tube (2) dans un forage (1) par un coulis de scellement injecté depuis l'intérieur du tube.
- Procédé selon la revendication 1, caractérisé en ce qu'on fixe le tube (2) à l'armature (6) au moyen d'un coulis de scellement durci avant d'introduire le tube et l'armature dans un forage (1) du terrain.
- Procédé selon l'une des revendications précédentes, caractérisé en ce que l'on utilise un tube (2) en fibres de verre.
- Tirant d'ancrage comprenant une armature longitudinale (6) à enfoncer dans un forage (1) du terrain et à sceller au terrain par un coulis de scellement, l'extrémité opposée (6b) de l'armature étant apte à être sollicitée par des moyens de traction (7,8) pour précontraindre le tirant, et un tube (2) à disposer autour de l'armature dans le coulis de scellement, ledit tube (2) étant apte à résister à la traction de précontrainte, caractérisé en ce que le tube (2) est constitué de façon telle que sa paroi soit mise en traction sans se rompre sous l'effet de la précontrainte de l'armature (6), assurant la transition de l'effort de traction du tirant au terrain pendant la phase de service, et soit apte à être rompue par une traction exercée sur l'armature supérieure à la traction de précontrainte mais insuffisante pour rompre l'armature.
- Tirant selon la revendication 6, dans lequel ledit tube (2) est en fibres de verre.
- Tirant selon la revendication 6 ou 7, en service dans le terrain, l'extrémité inférieure (6a) de l'armature étant scellée au terrain par le coulis durci contenant ledit tube (2) autour de l'armature et l'extrémité supérieure (6b) de l'armature étant sollicitée par une traction de précontrainte.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9309782 | 1993-08-09 | ||
| FR9309782A FR2708948B1 (fr) | 1993-08-09 | 1993-08-09 | Procédé pour faciliter l'extraction de l'armature d'un tirant précontraint et tirant correspondant. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0638689A1 EP0638689A1 (fr) | 1995-02-15 |
| EP0638689B1 true EP0638689B1 (fr) | 1998-05-06 |
Family
ID=9450062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94401824A Expired - Lifetime EP0638689B1 (fr) | 1993-08-09 | 1994-08-08 | Procédé pour faciliter l'extraction de l'armature d'un tirant précontraint et tirant correspondant |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0638689B1 (fr) |
| AT (1) | ATE165885T1 (fr) |
| DE (1) | DE69410035T2 (fr) |
| FR (1) | FR2708948B1 (fr) |
| RU (1) | RU2101418C1 (fr) |
| ZA (1) | ZA945927B (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1087063B1 (fr) * | 1999-09-23 | 2009-06-17 | Forasol S.A. | Dispositif de forage et d'ancrage et procédé de mise en place de tirants d'ancrage |
| ATE476557T1 (de) * | 2000-05-08 | 2010-08-15 | Dywidag Systems Int Gmbh | Wieder ausbaubarer verpressanker |
| US6672806B2 (en) | 2000-11-22 | 2004-01-06 | Forasol International Sa | Device for drilling and anchoring and process for placing grout anchors |
| CN112663606A (zh) * | 2020-12-23 | 2021-04-16 | 江苏东合南岩土科技股份有限公司 | 一种混凝土扩大头预应力抗拔锚杆的施工方法 |
| RU2751107C1 (ru) * | 2021-01-12 | 2021-07-08 | Алексей Генрихович Малинин | Способ демонтажа грунтового трубчатого анкера и устройство для резки его трубчатой тяги |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH509476A (de) * | 1969-06-09 | 1971-06-30 | Losinger Ag | Fels- oder Alluvialanker und Verfahren zu dessen Herstellung |
| FR2122094A5 (fr) * | 1971-01-12 | 1972-08-25 | Bauer Karlheinz |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4069677A (en) * | 1975-06-20 | 1978-01-24 | Kabushiki Kaisha Nitto Tekuno Group | Anchor and method for constructing same |
| DE2606095B1 (de) * | 1976-02-16 | 1976-12-02 | Dyckerhoff & Widmann Ag | Ausbaubarer verpressanker mit zerstoerbarem ankerkoerper |
| MY108500A (en) * | 1988-07-06 | 1996-10-31 | Vsl Int Ag | Method of producing a tension part anchorable in the earth. |
| NL9102004A (nl) * | 1991-11-29 | 1993-06-16 | Hollandsche Betongroep Nv | Werkwijze voor het aanbrengen van een anker ter verankering van grondkerende wanden, bouwwerken, oeverbeschoeiingen, kademuren en dergelijke. |
-
1993
- 1993-08-09 FR FR9309782A patent/FR2708948B1/fr not_active Expired - Fee Related
-
1994
- 1994-08-05 RU RU94028646A patent/RU2101418C1/ru not_active IP Right Cessation
- 1994-08-08 AT AT94401824T patent/ATE165885T1/de not_active IP Right Cessation
- 1994-08-08 DE DE69410035T patent/DE69410035T2/de not_active Expired - Lifetime
- 1994-08-08 EP EP94401824A patent/EP0638689B1/fr not_active Expired - Lifetime
- 1994-08-08 ZA ZA945927A patent/ZA945927B/xx unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH509476A (de) * | 1969-06-09 | 1971-06-30 | Losinger Ag | Fels- oder Alluvialanker und Verfahren zu dessen Herstellung |
| FR2122094A5 (fr) * | 1971-01-12 | 1972-08-25 | Bauer Karlheinz |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0638689A1 (fr) | 1995-02-15 |
| RU94028646A (ru) | 1996-05-27 |
| FR2708948A1 (fr) | 1995-02-17 |
| RU2101418C1 (ru) | 1998-01-10 |
| FR2708948B1 (fr) | 1995-11-03 |
| ATE165885T1 (de) | 1998-05-15 |
| DE69410035T2 (de) | 1998-12-17 |
| DE69410035D1 (de) | 1998-06-10 |
| ZA945927B (en) | 1995-04-12 |
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