EP2550404A2 - Dispositif pour un induit au moins partiellement demontable, et procede de demontage au moins partiel d'un induit - Google Patents

Dispositif pour un induit au moins partiellement demontable, et procede de demontage au moins partiel d'un induit

Info

Publication number
EP2550404A2
EP2550404A2 EP10711318A EP10711318A EP2550404A2 EP 2550404 A2 EP2550404 A2 EP 2550404A2 EP 10711318 A EP10711318 A EP 10711318A EP 10711318 A EP10711318 A EP 10711318A EP 2550404 A2 EP2550404 A2 EP 2550404A2
Authority
EP
European Patent Office
Prior art keywords
tension member
induction coil
support tube
anchor
tension members
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
EP10711318A
Other languages
German (de)
English (en)
Other versions
EP2550404B1 (fr
Inventor
Hans Peter Von Allmen
Toni Baer
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.)
STAHLTON AG
Original Assignee
Stahlton AG
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 Stahlton AG filed Critical Stahlton AG
Priority to EP15192785.2A priority Critical patent/EP2998447B1/fr
Publication of EP2550404A2 publication Critical patent/EP2550404A2/fr
Application granted granted Critical
Publication of EP2550404B1 publication Critical patent/EP2550404B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 present invention relates to a device for an at least partially removable anchor and a method for at least partially removing an anchor.
  • Temporary prestressed anchors are often used to anchor the vertical walls of excavations.
  • Such preloaded anchors are, for example, from a bundle of parallel Siebendrähtiger
  • Spannstahllitzen composed, which serve as tension members.
  • the strands are fixed by means of clamping wedges in an anchor head. Behind them, the strands run individually or in a collective casing made of PE - without bonding with the ground and freely stretchable over the ground
  • Anchorage body by means of injected cement mortar connected to the ground, in order to transfer the forces applied to the anchor head forces in the ground.
  • Anchors without anchoring length L v / so-called pressure tube anchors are used, in which the free
  • Anchor length L fr extends to the anchor end, from where the anchor force on a the tension member enclosing
  • Pressure pipe is introduced into the ground.
  • conventional anchors have a breaking load of 400 to 2500 kN and a setting force of 240 to 1500 kN, which are offset in lateral and vertical distances of 2 to 4 m.
  • the anchors are composed according to the depth of the pit and the forces acting on the anchored structure forces typically from a free anchor length L fr of 7 to 25 m and - if available - an anchoring length L v of 4 to 8 m together and depending on the depth of Excavation in several, staggered in depth layers installed.
  • L fr free anchor length
  • L v anchoring length
  • the majority of anchors come to lie beneath neighboring properties.
  • the anchors lose their function. If the whereabouts of the tension members in the ground e.g. is undesirable because of later proposed in this area, the anchors must be as far as possible, i. at least their over the free anchor length extending part are removed. To remove the anchor, the method is known in advance
  • Break off predetermined breaking point by applying appropriate forces on the anchor head (see, for example, DE 195 00 091 Cl).
  • Tensile elements are compensated. Also, the weakened tension members have a relatively rigid behavior, so that the
  • Break occurs abruptly and does not announce itself by a previous stretching.
  • An abrupt failure of an anchor is undesirable in particular with regard to system security.
  • methods are known which are the separation of
  • Tension members by heating or melting by means of an aluminothermic reaction mixture effect see, for example, DE 34 00 350 AI).
  • a disadvantage is, inter alia, that a uniform heating of the tension member is difficult and not always a complete separation takes place. Are e.g. multiple strands present, they are not heated due to their different location in the hole exactly at the same time and thus not at the same time to break. The first broken wires can lead to premature release of the anchoring on the anchor head, causing the
  • the induction coil is located between a flat thermal insulation and an asbestos hose. This is movable and thus protects the
  • Induction coil insufficient against displacements relative to the tension members.
  • the armature especially if it remains longer in the ground, it can lead to damage of the induction coil when moving, so that it is no longer functional.
  • the cable extends to the power supply of the induction coil between serving as tension members
  • Object of the present invention is to improve the known devices and methods so that the
  • Tension member of an anchor in a simpler and more reliable manner is separable.
  • Embodiments of the inventive device and the inventive method and a prestressable anchor with an inventive device are provided.
  • the invention is based on the finding that, contrary to the teachings of EP 0 583 725 AI, no additional electrically conductive metal tube is required to a tension member beyond the Curie temperature out to the
  • the invention is further preferred
  • Figure 1 is a schematic section through an excavation with an anchor equipped with a separator for separating the tension members at a predetermined separation point.
  • Fig. 2 is a longitudinal section of the separating device according to
  • Fig. 1 which is mounted according to a first embodiment at the end of the collecting tube of the free anchor length Lf r ;
  • Fig. 3 is a front view of a spacer for a
  • FIG. 4 shows a cross section of the separating device according to FIG. 1 in the sectional plane designated by I-I in FIG. 2;
  • Fig. 5 shows the course of the relative strength of
  • FIG. 6 is a longitudinal section of the separating device according to
  • Fig. 1 in which according to a second embodiment, the end of the collecting tube of the free anchor length L fr serves as a carrier tube;
  • Fig. 7 is a section through the separator in the pig. 6 section plane designated II-II;
  • Fig. 8 shows the view of the spacer pin for the
  • Fig. 9 is a longitudinal section of the separating device according to
  • Fig. L which is mounted according to a third embodiment at the end of the collecting duct of the free anchor length L fr and filled with injection material;
  • FIG. 10 shows a section through the separating device in the sectional plane designated III-III in FIG. 9.
  • Fig. 1 shows an excavation 1, whose vertical
  • each armature 5 is each designed, for example, as a seven-stranded prestressing steel strand and have a free anchor length (L fr ) 7 guided without composite through a collecting duct 10, and a cement mortar 11
  • Separator 13 for separating the tension members 9 integrated into the armature 5.
  • a cable 18 for powering the separator 13 extends outside of the collecting tube 10 and is attached thereto. The injection line through which the
  • Cement mortar is anchored to anchor, also runs outside the collecting duct 10 (not
  • FIG. 2 shows the structure of a first embodiment of the separation device 13 for separating the tension members 9 at the separation point 12.
  • For energy transmission is the
  • the winding 16 has a number of
  • Windings which is in the range of 5 to 50, preferably 10 to 30.
  • Winding 16 is at the two ends of the winding 16th
  • the support tube 15 is rigid to prevent displacement of the induction coil 16 relative to the tension members 9 and any resulting damage thereto, and is made of a material that is electrically insulating and non-ferromagnetic. Due to the rigidity of the
  • Carrier tube 15 is u. a. prevents the forces occurring after the installation of the armature deform the support tube 15 at least over the region of the induction coil 16.
  • the material for the support tube 15 e.g.
  • the separating device 13 is arranged substantially centrally in the borehole 4 and the cavity between the
  • the induction coil 16 is supplied in operation via the electric cable 18 with higher frequency power to heat the tension members 9 inductively to breakage.
  • the cavities between the support tube 15 and the tension members 9 are filled with a filling 17.
  • Et al The following materials are suitable as filling 17: Cement-water mixture with the possible addition of one or more
  • Additives e.g. Propellant, condenser and
  • thermally insulating aggregates putty, etc.
  • the filling 17 has different effects:
  • the backfilling 17 causes a thermal insulation of each individual tension member 9, so that the uniform heating is ensured without radiation or absorption of radiation energy of adjacent tension members 9.
  • the tension members 9 formed as strands 14 it is ensured that the wires of the individual strands 14 and the strands 14 are heated at the same speed.
  • the backfilling 17 causes a minimal anchoring of the tension members 9 air side of the separation point 12.
  • the first tearing wires of the individual strands 14 are slightly delayed only then set in motion, if several or all wires and strands
  • Anchoring is particularly effective when the largest possible part of the
  • Carrier tube 15 is located on the air side of the separation point 12. As can be seen in FIG. 2, the winding 16 is arranged laterally offset from the center of the support tube 15 for this purpose. - By the spacer element 20 and the backfilling 17, the support tube 15 is sealed, so that an accumulation of water at the separation point 12 is avoided. Water is in addition to a prevention of any corrosion, inter alia
  • Separation point 12 is a synchronous tearing of the individual wires, in particular in tension members 9 of strands 14
  • Carrier tube 15 inserted into the collecting duct 10. End of the support tube 15 spacers 20 are let in, which have passages through which the
  • the spacers 20 are made of a solid or relatively solid material, e.g. Made of metal or plastic. They ensure, in particular during assembly of the separating device 13, that the part of the
  • FIG. 3 shows a front view of a single
  • Spacer 20 which is designed for a maximum of seven tension members 9 and thus provided with seven passes 20.1 - 20.7.
  • the outer passages 20.2 - 20.7 are arranged uniformly distributed around the central passage 20.1. Depending on the number N of the tension members 9 used, the respective passage 20.1 - 20.7 is penetrated either by a tension member 9 or by the filling 17
  • a symmetrical arrangement of the tension members 9 is e.g. achievable by a tension member 9 passes through the following passes:
  • Each number N gives a rotational symmetry, i. with a rotation through the angle 360 ° / r. come with one
  • Spacer 20 arbitrarily adaptable to the number N of the tension members provided at the anchor.
  • the spacer 20 may be designed for anchors with 8 - 12 strands or 13 - 19 strands as tension members.
  • Fig. 4 shows the cross section through the separator 13 at the separation point 12. The separator 13 is in
  • tension members are provided, which are each formed as a strand 14 with seven wires and enclosed by the wound on the support tube 15 induction coil 16.
  • This has an outer diameter D a and an inner diameter Di, wherein the ratio D a to D is at most 1.5 and preferably at most 1.25.
  • FIG. 6 shows a longitudinal section through a structure of a separation device 13 according to a second embodiment for separating the tension members 9 at the separation point 12.
  • the separation device 13 with an induction coil in the form of a single-layer winding 16th
  • the winding 16 has a number of turns, which is in the range of 5 to 50, preferably 10 to 30.
  • the winding is on the collecting duct 10 by a
  • Shrink tube 23 fixed.
  • the electric cable 18 extends outside the collecting duct 10 to the anchor head 6 and is characterized against damage during preloading the
  • Tension members 9 are filled with a filling 17.
  • the filling 17 is bounded on both sides by spacer pins 21 made of an elastically deformable material, e.g. Rubber are made.
  • the collecting tube 10 is locally by means of steel strips 22, which are tensioned with sufficient force
  • Spacer 21 closes.
  • FIG. 7 shows the cross section through the separating device 13 at the separating point 12.
  • Fig. 8 shows the spacer pin 21 for a tension member consisting of 4 prestressing steel strands 14 with the passages 21.1 to 21.4.
  • the spacer pin 21 has a length which is at least equal to the width of the steel strip 22nd
  • FIG. 9 shows a longitudinal section through a structure of a separating device according to a third embodiment, which after the bitumen filling 24 at the end of
  • the end of the collecting sleeve 10 is poured out against the cement mortar 11 injected into the anchoring length 8 with a hot-filled bitumen filling 24, which is fixed with steel bands 22 opposite the collecting sleeve 10.
  • the winding 16 consisting of turns of the electric cable 18 is seated on a support tube 15, which with a
  • Shrink tubing 23 opposite the collecting duct 10 and the anchoring length 8 forming part of the tension members 14th is fixed.
  • the cavities between the support tube 15 and the tension members 9 are directly through the in the
  • Anchoring length 8 injected cement mortar 11 filled.
  • the support tube 15 is sealed at the air-side end, but open at the mountain end, so that the injection material 11 can penetrate during injection into the support tube 15 and this can fill.
  • the support tube 15 so sealed on the prestressable part of the tension members 9 side of the separation point 12 that on the one hand a passage of water and on the other a passage of
  • Separation point 12 can penetrate and so an efficient
  • Heating the tension members 9 is made possible. Below are further explanations, which are not specifically to a single embodiment
  • Tension member 9 on a soul to which wires are wound whose diameter is smaller than the diameter of the soul. This ensures that during the heating process, the soul, which is additionally heated by the surrounding wires, not the first rips, but all the wires of the strand 14 are separated simultaneously.
  • the tension members 9 of the prestressed ground and rock anchors 5 are usually biased to about 60% of the breaking force. Since an anchor 5 can be embedded in the ground for a long time, for the removal by means of the separator 13 to ensure that the tension members 9 still sufficient
  • the bias voltage is selected so that during the heating process by the induction coil 16, the respective tension member 9 is biased with a force corresponding to at least 10%, preferably at least 25% and more preferably at least 50% of the breaking force of the tension member 9 at 0 degrees Celsius.
  • Fig. 5 shows the profile of the strength F as a function of the temperature T for a drawn prestressing steel wire, wherein F is normalized to the value of the strength at 0 degrees Celsius.
  • the strength at temperatures above 600 ° C falls below 10% of the original value. Accordingly, the higher the bias voltage during the heating operation, the lower the temperatures are sufficient to cause the tension member 9 to crack.
  • the separator 13 need not be designed to allow heating above the Curie temperature (for Fe 768 ° C) to the melting point, as is the case with the device of EP 0 583 725 A1. In particular, no electrically conductive metal tube is required, which in the area between the
  • Induction coil 16 and the separation point 12 is arranged and the tension members 9 heated by heat conduction and heat radiation.
  • the magnetic field generated by the induction coil 16 can therefore freely penetrate into the tension members 9 and heat them.
  • the load resonant circuit is constructed as a parallel resonant circuit, which as elements power capacitors and the connected via the cable 18 winding 16 on. Capacitance and inductance of these elements determine the working frequency.
  • the load circuit is connected to a power source, which can be connected to the usual power grid
  • Main transformer a rectifier, a chopper and a smoothing part contains.
  • the load circuit is connected to an H-bridge, which is controlled by the chopper.
  • Frequency converter and typically weighs less than 100 kg and preferably less than 50 kg. Also, by the integration of the respective used
  • Heating the tension members 9 is used.
  • Induction coil 16 are subjected to a current which is above 2.5 A, preferably above 5 A and more preferably above 10 A and having a frequency f of about 1 kHz and preferably about 10 kHz. Typically, the frequency is in the range of 30-50 kHz.
  • Frequency converter output power is greater than 1 kW and preferably more than 3 kW, e.g. at 5 kW.
  • the heating power which is induced by means of the induction coil 16 in the tension members 9, increases with increasing frequency f of the flow.
  • the penetration depth of the current decreases as the frequency f increases.
  • the cable 18 is at least 5 m and preferably at least 10 m long and is a commercially available cable, for example one with more than two wires and / or with wires each having a cross section of at least 1.5 mm 2 .
  • the respective core can be designed either as a single wire or as a stranded wire. If a cable 18 is used with four wires, so are advantageously each other two
  • the separation device 13 shown here is for removal (deconstruction) at least the free anchor length of the tension members of prestressed floor and rock anchors, as described, for example, in the Swiss standard "SIA 267 geotechnics" and "EN 1537 ground anchors". Based on the previous description of
  • Spacer 21 can be used.
  • the separator still remains slender in the lateral extent, even in this embodiment.
  • the separator is in addition to anchor with a
  • Anchoring length in particular pressure tube anchor used.

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  • 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)

Abstract

L'invention porte sur un dispositif pour un induit au moins partiellement démontable, le dispositif comprenant au moins une barre de traction (9), pouvant subir une précontrainte, et une bobine d'induction (16), qui entoure la barre de traction, destinée à séparer la barre de traction au niveau d'une zone de séparation (12) par chauffage par induction. La bobine d'induction (16) est disposée sur un tube porteur (15), qui est étanché (17, 20) sur le côté de la zone de séparation (12) en regard de la partie (7), pouvant subir une précontrainte, de la barre de traction. La zone entre la bobine d'induction (16) et la zone de séparation (12) ne possède pas de tube métallique conducteur de l'électricité. Pour le démontage au moins partiel de l'induit, la barre de traction (9) est, lors de l'opération de chauffage, soumise à une précontrainte à l'aide d'une force qui correspond à au moins 10 %, de préférence à au moins 25 % et d'une manière particulièrement préférée à au moins 50 % de la résistance à la rupture de la barre de traction à 0 degré Celsius.
EP10711318.5A 2010-03-25 2010-03-25 Dispositif pour un ancrage au moins partiellement démontable, et procédé de démontage au moins partiel d'un ancrage Active EP2550404B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15192785.2A EP2998447B1 (fr) 2010-03-25 2010-03-25 Procede de demontage au moins partiel d'une ancre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2010/000086 WO2011116483A2 (fr) 2010-03-25 2010-03-25 Dispositif pour un induit au moins partiellement démontable, et procédé de démontage au moins partiel d'un induit

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP15192785.2A Division EP2998447B1 (fr) 2010-03-25 2010-03-25 Procede de demontage au moins partiel d'une ancre
EP15192785.2A Division-Into EP2998447B1 (fr) 2010-03-25 2010-03-25 Procede de demontage au moins partiel d'une ancre

Publications (2)

Publication Number Publication Date
EP2550404A2 true EP2550404A2 (fr) 2013-01-30
EP2550404B1 EP2550404B1 (fr) 2017-07-12

Family

ID=44486406

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15192785.2A Active EP2998447B1 (fr) 2010-03-25 2010-03-25 Procede de demontage au moins partiel d'une ancre
EP10711318.5A Active EP2550404B1 (fr) 2010-03-25 2010-03-25 Dispositif pour un ancrage au moins partiellement démontable, et procédé de démontage au moins partiel d'un ancrage

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP15192785.2A Active EP2998447B1 (fr) 2010-03-25 2010-03-25 Procede de demontage au moins partiel d'une ancre

Country Status (2)

Country Link
EP (2) EP2998447B1 (fr)
WO (1) WO2011116483A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3336259B1 (fr) 2016-12-16 2019-10-16 Stahlton AG Ancrage dans le sol et/ou dans la roche comprenant un tirant réutilisable

Family Cites Families (14)

* 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
FR2274740A1 (fr) * 1975-06-27 1976-01-09 Fischer Joachim Procede pour l'extractio
CH603919A5 (en) 1976-04-02 1978-08-31 Losinger Ag Releasing free section of tie anchor
JPS53101805A (en) * 1977-02-17 1978-09-05 Isamu Ikeda Method of removing anchor
JPS58110719A (ja) * 1981-12-24 1983-07-01 Chem Kurauto Kk ア−スアンカ−引抜き方法
CH661079A5 (de) 1983-01-13 1987-06-30 Dyckerhoff & Widmann Ag Verfahren und vorrichtung zum ausbauen des freien teils des zuggliedes eines vorgespannten verpressankers.
CH681835A5 (fr) 1992-08-17 1993-05-28 Toni Baer
DE19500091C1 (de) 1995-01-04 1996-04-04 Dyckerhoff & Widmann Ag Verfahren zum Erzeugen einer Sollbruchstelle an einem Zugglied für einen Verpreßanker
NL1015346C2 (nl) * 2000-05-31 2001-12-03 Visser & Smit Bouw Bv Werkwijze voor het verwijderen van de vrije ankerlengte van een in de grond aangebracht groutanker, alsmede een groutanker voor het uitvoeren van deze werkwijze.
JP2005248587A (ja) * 2004-03-04 2005-09-15 Anderson Technology Kk グラウンドアンカー中のｐｃ鋼材の溶断方法及び溶断装置
JP2007262880A (ja) * 2006-03-02 2007-10-11 Ats & E Co Ltd 埋設アンカー中の引張部材の切断装置及び切断方法
JP4910142B2 (ja) * 2006-10-05 2012-04-04 飛島建設株式会社 高周波誘導加熱アンカー除去装置
JP5217054B2 (ja) * 2007-03-02 2013-06-19 住友電工スチールワイヤー株式会社 ストランド
CH702926B9 (de) * 2007-10-09 2011-12-30 Stahlton Ag Vorrichtung für einen zumindest teilweise ausbaubaren Anker und Verfahren zum zumindest teilweisen Ausbau eines Ankers.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011116483A2 *

Also Published As

Publication number Publication date
EP2998447A1 (fr) 2016-03-23
WO2011116483A3 (fr) 2012-03-08
WO2011116483A2 (fr) 2011-09-29
EP2550404B1 (fr) 2017-07-12
EP2998447B1 (fr) 2017-10-04

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