EP0350454A2 - Procédé pour former un organe de traction ancrable dans le sol - Google Patents

Procédé pour former un organe de traction ancrable dans le sol Download PDF

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Publication number
EP0350454A2
EP0350454A2 EP89810506A EP89810506A EP0350454A2 EP 0350454 A2 EP0350454 A2 EP 0350454A2 EP 89810506 A EP89810506 A EP 89810506A EP 89810506 A EP89810506 A EP 89810506A EP 0350454 A2 EP0350454 A2 EP 0350454A2
Authority
EP
European Patent Office
Prior art keywords
support element
tension member
central
tension
ground
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
Application number
EP89810506A
Other languages
German (de)
English (en)
Other versions
EP0350454B1 (fr
EP0350454A3 (en
Inventor
Kurt Lüthi
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.)
VSL International Ltd
Original Assignee
VSL International Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by VSL International Ltd filed Critical VSL International Ltd
Priority to AT89810506T priority Critical patent/ATE89882T1/de
Publication of EP0350454A2 publication Critical patent/EP0350454A2/fr
Publication of EP0350454A3 publication Critical patent/EP0350454A3/de
Application granted granted Critical
Publication of EP0350454B1 publication Critical patent/EP0350454B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E02D5/80—Ground anchors
    • 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 method according to the preamble of patent claim 1 and a traction element according to the preamble of patent claim 4.
  • excavation pits are often enclosed by slotted or sheet piling and anchored to the rear using tension anchors with tension elements.
  • the traction elements are temporarily anchored to the ground anchors.
  • the traction elements can also be used in the buildings themselves, e.g. when supporting a bridge. There forces can act on the supports during the construction of the bridge, which requires a temporary reinforcement of them by tension members.
  • the traction elements are removed from the ground or the building and can be used again if necessary.
  • the principle of a predetermined breaking point on the tension member is used.
  • the predetermined breaking point reduces the cross-section of the tension member. This method is mostly limited to rod-shaped steel tension members with a single tension rod. The tension member is torn off in the predetermined breaking point by stretching beyond the tensile strength limit and largely removed from the ground or the structure.
  • DE-PS 26 27 524 describes a grout anchor with a tension member surrounded by a cladding tube.
  • the pulling element designed in the form of a steel wire strand slidably extends through the cladding tube.
  • the traction element is guided with its end on the ground side through an anchor foot and held by means of a sleeve which is supported against the anchor foot.
  • An adhesive is arranged as an intermediate layer between the sleeve and the tension member and the tension member is pressed through the sleeve.
  • the clamping force of the sleeve is dimensioned such that the maximum resistance that is required to pull out the pulling element is somewhat greater than the load-bearing capacity that is exerted on the pulling element.
  • the disadvantage of this removable anchor is that the adhesive must be dimensioned and constructed in such a way that the load capacity really lies between the limits of the working load and the breaking strength.
  • the tolerance range during manufacture is very small and any inaccuracy can increase the uncertainty factor of the resilience of this known grout anchor.
  • the European patent application published under number 244 353 describes a tension member that can be anchored and expanded in the ground or in a building.
  • This tension member consists of a central link and several outer links surrounding it.
  • the central member is in any case completely severed at one point and a support element is pressed around the traction element via this separation point. By moving the separation point within the support element, the working load to be exerted on the pulling element can be adapted to the requirements.
  • This traction element with a severed central link is very suitable if no great demands are made on sufficient elasticity. It is a job the invention to propose a method for producing an expandable tension member with which the tension member can be produced in a simple manner and wherein the tension member has a greater elasticity.
  • the tension member according to the invention is defined by the characterizing features of claim 4.
  • the tension member 1 consists of a steel wire strand.
  • a 3 ' is completely severed at a point 4.
  • the stranded, consisting of wires outer members 3 are partially opened and the outer member 3 'sawed through completely.
  • a tubular support element 5 is pushed over the rear end region 1a of the traction element 1, which is later to be anchored in the ground or building, until the support element 5 just covers the separation point 4. Then the support element 5 is exposed to radially inward forces, as a result of which the support element 5 is pressed firmly against the pulling element 1 by transverse pressing.
  • An insert 11 is located between the inner surface of the tubular support element 5 and the pulling element 1.
  • the insert 11 is made of a material that is harder than the support element 5 and the pulling element 1.
  • the surface of the insert resting on the outer members 3 of the pulling element 1 11 is provided with a toothing 13 for securely holding the tension member 1.
  • the length L of the support element 5 corresponds approximately to four to six times the diameter of the tension member 1 and the distance L1 of the separation point 4 compared to the rear Ren end of the traction element 1 facing away from the end of the support element 5 is in the embodiment shown in FIG. 1 about a twentieth of the length L of the support element 5.
  • the separation point 4 can, however, in a range of 1/2 L before to after the mentioned end of the support element 5th lie.
  • a plate 8 serving as an abutment for supporting the support element.
  • a cement emulsion for forming a grouting body (not shown) is later injected into the soil surrounding that part 1a of the traction element 1, which is to the right of the plate 8 in relation to FIG. 1, in order to create a grouting anchor.
  • FIGS. 1 and 2 shows the pulling element 1 shown in FIGS. 1 and 2, the major part of which has been separated from the supporting element 5 held in the pressing body (not shown) by exerting a load P on the free end of the pulling element 1.
  • Fig. 3 shows that the outer members 3 not severed in the use state of the anchor in the vicinity of the separation point 4 of the outer member 3 'which has been completely severed from the beginning are broken. In contrast to this, the section of the central member 2 originally located in part 1a of the tension member 1 has not been broken, but has been pulled out of part 1a.
  • a large stretch, i.e. a plastic deformation of the tension member 1 is particularly advantageous in order to be able to recognize any additional forces that may occur after prestressing, for example as a result of the earth pressure on the anchor, by a visible displacement of the anchor head.
  • the pulling element 1 shown in FIG. 4 has a central steel rod 10 and six outer central rods 9, of which the steel rods 9 'are completely severed at points 4 and 6, respectively. So that the steel rods 9 and 10 are arranged and run parallel to one another, they are held together at regular intervals by clamping sleeves 7, of which only one is visible in FIG. 4.
  • the rear part 1a of the tension member 1 is pressed together by the tubular support element 5 and held.
  • the plate 8 serving as an abutment is arranged next to the support element 5. This plate has the same function as the anchor base on a press anchor.
  • the separation points 4 and 6 are, based on Fig. 4, on the left side of the plate 5, i.e. at a distance of about a quarter of the length of the support element 5 in front of the same.
  • FIG. 5 shows that section of the traction element 1 which is separated from the anchored part 1a by the action of a greater load than the working load, the four outer steel rods 9, only two of which are visible, being broken by the greater load. Similar to the example shown in FIG. 3, the section of the central steel rod 10 pulled out of part 1a.
  • FIG. 6 shows a further embodiment of the tension element 1 according to the invention, which, as in the example shown in FIGS. 1 and 2, is a steel wire strand with the central member 2 and the outer members 3.
  • the part to be anchored 1a of the tension member 1 surrounding support element 5 ' has a rearward, with respect to Fig. 6 to the right widening bore 12 in which two wedges 14 and 15 with an internal toothing 16 for holding the part 1a of the tension member 1 are arranged.
  • the separation point 4 of the outer member 3 ' is reset by about a seventh the length of the support element 5' from its front end.
  • the active part of the pulling element shown in FIG. 6 is surrounded by a cladding tube 17 and the space between the pulling element 1 and the inside of the cladding tube 17 is to facilitate both the pretensioning and the expansion of the active part of the pulling element 1 with a lubricant 18 filled out.
  • a cladding tube 17 can also be provided in the embodiments shown in FIGS. 1 and 4.
  • the support elements 5 with the associated separation points 4 can also be arranged at one point of the active part of the pulling element 1.
  • Such embodiments, not shown, have an extended passive, i.e. part to be anchored. By applying load, all non-severed outer members of such a tension member break in the area of the support element 5, so that the tension member can possibly be largely removed from the ground or structure for reuse.

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)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Tents Or Canopies (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Control And Safety Of Cranes (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Harvesting Machines For Specific Crops (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
EP89810506A 1988-07-06 1989-07-04 Procédé pour former un organe de traction ancrable dans le sol Expired - Lifetime EP0350454B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89810506T ATE89882T1 (de) 1988-07-06 1989-07-04 Verfahren zum herstellen eines im erdreich verankerbaren zugorganes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH258188 1988-07-06
CH2581/88 1988-07-06

Publications (3)

Publication Number Publication Date
EP0350454A2 true EP0350454A2 (fr) 1990-01-10
EP0350454A3 EP0350454A3 (en) 1990-04-18
EP0350454B1 EP0350454B1 (fr) 1993-05-26

Family

ID=4237012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810506A Expired - Lifetime EP0350454B1 (fr) 1988-07-06 1989-07-04 Procédé pour former un organe de traction ancrable dans le sol

Country Status (9)

Country Link
US (1) US5113634A (fr)
EP (1) EP0350454B1 (fr)
JP (1) JP2846661B2 (fr)
KR (1) KR900001934A (fr)
AT (1) ATE89882T1 (fr)
AU (2) AU3715489A (fr)
DE (1) DE58904466D1 (fr)
HK (1) HK130094A (fr)
MY (1) MY108500A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0638689A1 (fr) * 1993-08-09 1995-02-15 Bouygues Procédé pour faciliter l'extraction de l'armature d'un tirant précontraint et tirant correspondant

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0659976A3 (fr) * 1993-12-23 1995-09-27 Rsc Mining Proprietary Limited Boulon d'ancrage.
US6056482A (en) 1996-01-11 2000-05-02 Jennmar Corporation Cable bolt head
DE19732023A1 (de) * 1997-07-25 1999-01-28 Drahtwerk Koeln Gmbh Verfahren zum Herstellen und zum Entfernen einer Litze mit Soll-Bruchstelle
US6601354B2 (en) * 2001-07-12 2003-08-05 Bill Hughes Method and apparatus for post-tensioning steel strands in slab construction
AU2008200918B2 (en) * 2007-02-28 2014-07-31 Fci Holdings Delaware, Inc. Improved cable bolt
CN104563110A (zh) * 2015-01-14 2015-04-29 中交水运规划设计院有限公司 剪式恒力仪及其使用方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59217830A (ja) * 1983-05-23 1984-12-08 Suzuki Kinzoku Kogyo Kk 除去式アンカ−工法
EP0244353A1 (fr) * 1986-04-28 1987-11-04 VSL International AG Méthode pour réaliser un élément de tension récupérable

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936924A (en) * 1973-09-21 1976-02-10 Yoshio Ichise Releaseable steel cable anchor and method for withdrawing the same
US4069677A (en) * 1975-06-20 1978-01-24 Kabushiki Kaisha Nitto Tekuno Group Anchor and method for constructing same
JPS54141005A (en) * 1978-04-22 1979-11-01 Sanshin Kensetsu Kogyo Kk Removed anchor wire strand structure
JPS5827368B2 (ja) * 1978-05-26 1983-06-09 神鋼鋼線工業株式会社 除去式ア−スアンカ−工法
US4719658A (en) * 1986-10-15 1988-01-19 Special Personal And Financial Planning And Referral Services, Inc. Hermetically sealed anchor construction for use in post tensioning tendons

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59217830A (ja) * 1983-05-23 1984-12-08 Suzuki Kinzoku Kogyo Kk 除去式アンカ−工法
EP0244353A1 (fr) * 1986-04-28 1987-11-04 VSL International AG Méthode pour réaliser un élément de tension récupérable

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 9, Nr 92 (M-373)[1815] 20 april 1985; & JP-A-59 217 830 (SUZUKI KINZOKU) 8 Dezember 1984 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0638689A1 (fr) * 1993-08-09 1995-02-15 Bouygues Procédé pour faciliter l'extraction de l'armature d'un tirant précontraint et tirant correspondant
FR2708948A1 (fr) * 1993-08-09 1995-02-17 Bouygues Sa Procédé pour faciliter l'extraction de l'armature d'un tirant précontraint et tirant correspondant.

Also Published As

Publication number Publication date
KR900001934A (ko) 1990-02-27
MY108500A (en) 1996-10-31
EP0350454B1 (fr) 1993-05-26
AU8142791A (en) 1991-10-10
AU3715489A (en) 1990-01-11
DE58904466D1 (de) 1993-07-01
US5113634A (en) 1992-05-19
JP2846661B2 (ja) 1999-01-13
EP0350454A3 (en) 1990-04-18
HK130094A (en) 1994-12-02
AU639355B2 (en) 1993-07-22
ATE89882T1 (de) 1993-06-15
JPH0249816A (ja) 1990-02-20

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