EP3321423A1 - Arrangement d'ancrage dans la terre, fondez l'ancre et la procédure pour jeter l'ancre. - Google Patents

Arrangement d'ancrage dans la terre, fondez l'ancre et la procédure pour jeter l'ancre. Download PDF

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Publication number
EP3321423A1
EP3321423A1 EP16198175.8A EP16198175A EP3321423A1 EP 3321423 A1 EP3321423 A1 EP 3321423A1 EP 16198175 A EP16198175 A EP 16198175A EP 3321423 A1 EP3321423 A1 EP 3321423A1
Authority
EP
European Patent Office
Prior art keywords
anchor
tension element
ground
anchoring
anchor body
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
EP16198175.8A
Other languages
German (de)
English (en)
Other versions
EP3321423B1 (fr
Inventor
Ulli Wiedenmann
Josef Mair
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.)
Bauer Spezialtiefbau GmbH
Original Assignee
Bauer Spezialtiefbau GmbH
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 Bauer Spezialtiefbau GmbH filed Critical Bauer Spezialtiefbau GmbH
Priority to EP16198175.8A priority Critical patent/EP3321423B1/fr
Priority to PCT/EP2017/071642 priority patent/WO2018086781A1/fr
Publication of EP3321423A1 publication Critical patent/EP3321423A1/fr
Application granted granted Critical
Publication of EP3321423B1 publication Critical patent/EP3321423B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E02D5/76—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 assembly in the ground with a ground anchor with an elongated tension element which is introduced into a bore in the ground, wherein the anchor element is connected to the tie element at a bottom anchoring portion, which has a larger outer diameter than the tension element, and the ground anchor a heating device for releasing the tension element, according to the preamble of claim 1.
  • the invention further relates to a ground anchor for such an anchor arrangement, with an elongated tension element, to which an anchor body can be fixedly connected to a base-side anchoring section, according to the preamble of claim 7.
  • the invention relates to a method for anchoring a ground anchor in the ground, in which a hole is created in the ground, the ground anchor is at least partially introduced into the bore and then an anchor body is formed on a bottom anchoring portion of an elongated tension element of the ground anchor, according to the preamble of claim 8.
  • Anchor assemblies with ground anchors are used, for example, in a back anchoring of excavation pit walls in the upcoming soil. By anchoring arrangement so that pending on a pit wall pressure forces can be dissipated in the rear floor.
  • a hole is first created through the excavation support wall in the rear floor.
  • the hole can be a length of up to 10 m and more.
  • a ground anchor is introduced with an elongated tension element made of a steel material.
  • an anchoring body is created by introducing a settable mass in the ground, which is firmly connected after setting with the tension element and the ground.
  • After curing of the anchoring body can be placed on a free head element of the ground anchor a tendon, in particular screwed.
  • the clamping element is applied to the excavation support wall and can thus initiate pending pressure forces on the tension element in the rear floor.
  • ground anchors it is desired to dismantle the ground anchors, for example when closing the excavation pit. This may be necessary for reasons of environmental protection, for example, if as few residues as possible should remain in the soil after completion of the construction work, or if the anchorages represent obstacles in the adjoining land. Furthermore, a recovery of at least parts of the ground anchor and resource-saving.
  • At least partially expandable ground anchors are known, which are also called expansion anchor. That's how it describes EP 0 583 725 A1 a ground anchor with a tension element, which is at least partially formed of a special ferromagnetic material.
  • the tension element can be heated beyond the Curie temperature of the steel material in a certain section, so that the strength of the tension element in the separation section is reduced.
  • the tension element is separated in the separation section. The separated part of the tension element can thus be removed from the ground.
  • tension elements of ground anchors with mechanical separating elements, such as threaded portions.
  • mechanical separating sections are expensive to produce and lead to increased costs.
  • releasable threaded portions often represent a limitation of the maximum applied tensile load.
  • the invention has for its object to provide an anchor assembly, a ground anchor and a method for anchoring, with which anchoring is possible in a simple and efficient manner, while maintaining the possibility of easy release.
  • connection with the tension element is formed with a connection material which firmly connects the tension element to the anchor body at ambient temperature, the connection being releasable at a predetermined solution temperature which differs from the ambient temperature.
  • a basic idea of the invention is to provide a special connecting material between the anchor body and the tension element which considerably reduces its strength at a prescribed dissolution temperature and thus allows the tension element to be released from the anchor body.
  • the connecting material thus represents an intermediate element between the anchor body, which remains in the ground, and the elongated metallic tension element. In a complete release of the tension element this can later again for another armature arrangement are used, which significantly reduces the cost of materials and thus the cost of anchoring.
  • Plastics can become brittle at low temperatures below 0 ° C and lose their strength.
  • Another advantage of the invention is that conventional tension members and ground anchors can be used without these themselves being constructed of special materials or steels.
  • the bonding material comprises a plastic material and / or a metallic material which melts or decomposes at the dissolution temperature.
  • any suitably suitable plastic material can be used for this purpose, which ensures a firm connection between the metallic tension element and the anchoring body at ambient temperatures, which is usually formed from a concrete material.
  • a metal such as tin, or a metallic alloy may be provided. It may also be appropriate to use a mixture of plastic and a metallic material.
  • the connecting material is a polyamide, in particular PA6-I Ultramid B3L.
  • Polyamide is a polymer that allows a good bond between different materials. Also provides polyamide at ambient conditions, ie at a temperature of 23 ° C high strength. Increasing the temperature to about 200 ° C decreases the strength many times over. Polyamide melts in a temperature range above approx. 270 ° C and can decompose at even higher temperatures.
  • a particularly preferred choice of material consists in the plastic PA6-I Ultramid B3L, which can be obtained from BASF AG. Ultramid is a registered trademark of BASF AG. This material has a yield strength of 70 MPa at 23 ° C.
  • the connecting material is formed as a sleeve, which at least on the bottom side Anchoring portion of the tension element is firmly applied.
  • the application can be done in any way, such as by casting or in a mechanical manner by pressing.
  • the attachment of a sleeve-shaped connecting material can be additionally supported by means of mechanical stops or form elements on the tension element and / or on the anchoring body and / or the sleeve body.
  • the heating device is particularly preferred for the heating device to be provided at least in the bottom-side anchoring section of the tension element. This allows a targeted heating of the anchoring portion, if a release is desired.
  • the heating device can be designed in any way.
  • a particularly efficient embodiment is achieved according to a preferred embodiment of the invention in that the heating device is designed as an electric heater.
  • the heating device can have a heating coil in the region of the anchoring section.
  • a particularly simple embodiment can be achieved in that the metallic tension element is used as a whole as an electrical resistance element for generating electrical heating heat.
  • an electrical forward or return line can be provided in an interior of the tubular tension element.
  • a voltage can be applied between two end regions of the tension element, so that at least in sections a current flows through the tension element. This flowing current leads to a corresponding heat generation due to the electrical resistance of the tension element.
  • the tension member may be a tie rod or a pull cord of a steel material. It is also possible to provide an inductive heating device with an induction coil, which has a metallic heating element inductively.
  • the heating element may be embedded in the connecting material.
  • the ground anchor according to the invention is characterized in that at least at the bottom anchoring portion for anchoring with the anchor body, a connecting material is attached, which connects the tension member fixed to the anchor body at ambient temperature and the connection to the anchor body at a predetermined Lieretemperaturlösbar, which is independent of the ambient temperature different.
  • the ground anchor is provided in particular for the anchor arrangement described above. With the ground anchor according to the invention in particular the advantages described above can be achieved.
  • the ground anchor can also be referred to as expansion anchor.
  • the ground anchor may preferably be formed as a grout anchor or a so-called Gewi anchor.
  • the invention is characterized in that at least at the bottom anchoring portion of the tension element, a connecting material is attached, which connects the tension element firmly to the anchor body at ambient temperature, that at least the bottom-side anchoring portion is brought to a dissolution temperature to remove the tension element from the ground, in which the connection to the anchor body dissolves, and that the tension element is pulled out of the ground.
  • the hole can be made with a separate drilling tool or through the ground anchor itself.
  • a release of the tension element from the anchor body is understood to mean the achievement of a significantly reduced strength of the connection material between the anchor body and the tension element, so that the tension element can be pulled out of the anchor body and the ground with a defined release force.
  • a preferred method variant of the invention is that the anchor body is introduced by introducing a hardenable anchoring mass via a feed line along the tension element in the ground, wherein the hardenable mass hardens to the anchor body.
  • the method can basically be carried out as previously known anchoring methods.
  • the connection material is applied in any desired manner, preferably in a sleeve shape, at least at the base-side anchoring section. After introduction of the tension element prepared in this way into the ground, the flowable anchoring mass in the region of the ground-side anchoring section on the tension element is introduced via a feed line.
  • the anchoring mass can penetrate into deeper, radially spaced from the tension element bottom portions, so that a relatively large anchoring body is formed in the ground.
  • the hardenable Mass may in particular be a concrete mass or some other mass with a cement paste.
  • the heating of the anchoring portion of the tension element can take place in any desired manner. Heating could be formed via a burner or by chemically generating the heat energy. According to a development of the invention, it is particularly efficient that the heating of the at least bottom-anchoring section of the tension element takes place by means of an electrical heating device. At the free end of the tension element corresponding connections can be provided for an electrical energy source. Preferably, the electrical heating device is formed directly by the tension element and / or provided only on the anchoring portion of the tension element.
  • Fig. 1 is in a hole 7 in the bottom 5, a rod-shaped ground anchor 20 is introduced.
  • the bore 7 can be created by a separate drilling tool or directly by the ground anchor 20 when introduced into the ground 5.
  • the ground anchor 20 has a rod-shaped, elongate tension element 22, on whose bottom-side end region an anchoring portion 24 is arranged.
  • a sleeve 18 is formed from a connecting material 16.
  • the connecting material 16 is a in the present embodiment special polymer, especially Ultramid.
  • the sleeve 18 constitutes a connecting element which connects the tension element 22 with an outer annular anchoring body 12.
  • the anchoring body 12 is formed by introducing or injecting a hardenable mass from a surface 6 of the bottom 5 along the tension member 22 via a feed line.
  • a flowable concrete suspension which hardens after injection into the anchor body 12 can be used as an anchoring mass.
  • the anchor body 12 is connected via the sleeve 18 fixed to the anchoring portion 24 of the tension member 22 in normal environmental conditions.
  • the ambient temperature in the exemplary embodiment is 23 ° C., the strength values in principle also applying to temperatures up to 0 ° C. and below.
  • a tensioning member 26 can be applied approximately via a threaded connection.
  • the tendon 26 can thus act on the surface 6 of the bottom 5 acting compressive forces, such as those caused on excavation walls, and derive via the tension element 22 and the anchor body 12 in the rear regions of the bottom 5.
  • the tension member 22 may have a length of several meters, in particular up to 15 m and longer.
  • the ground anchor 20 can easily be pulled out of the ground 5, as in FIG Fig. 2 is shown.
  • the tension element 22 of the ground anchor 20 is heated at least in the region of the anchoring portion 24 via a heater, not shown, from the ambient temperature to a dissolution temperature of for example 220 ° C.
  • the heating device may be an electric heating coil or the metallic tension element 22 itself, electrical energy being supplied from a surface 6 of the base 5 via lead connections (not shown).
  • the strength of the bonding material 16 decreases considerably, to about 10% of the original strength at ambient temperature.
  • the sleeve 18 is destroyed from the polymer or bonding material 16.
  • Connecting material 16 may remain both on an inner side of the annular anchor body 12 and on an outer side of the tension element 22. The tension element 22 released by the anchor body 12 can thus be pulled out of the ground 5 relatively easily.

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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)
EP16198175.8A 2016-11-10 2016-11-10 Arrangement d'ancrage dans la terre, fondez l'ancre et la procédure pour jeter l'ancre. Active EP3321423B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16198175.8A EP3321423B1 (fr) 2016-11-10 2016-11-10 Arrangement d'ancrage dans la terre, fondez l'ancre et la procédure pour jeter l'ancre.
PCT/EP2017/071642 WO2018086781A1 (fr) 2016-11-10 2017-08-29 Dispositif d'ancrage dans le sol, élément d'ancrage dans le sol et procédé d'ancrage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16198175.8A EP3321423B1 (fr) 2016-11-10 2016-11-10 Arrangement d'ancrage dans la terre, fondez l'ancre et la procédure pour jeter l'ancre.

Publications (2)

Publication Number Publication Date
EP3321423A1 true EP3321423A1 (fr) 2018-05-16
EP3321423B1 EP3321423B1 (fr) 2020-01-08

Family

ID=57288192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16198175.8A Active EP3321423B1 (fr) 2016-11-10 2016-11-10 Arrangement d'ancrage dans la terre, fondez l'ancre et la procédure pour jeter l'ancre.

Country Status (2)

Country Link
EP (1) EP3321423B1 (fr)
WO (1) WO2018086781A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110206031A (zh) * 2019-05-08 2019-09-06 江苏科技大学 一种温度响应自紧锚杆及其施工方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH603915A5 (en) 1977-03-09 1978-08-31 Sommer Schenk Ag Swimming pool cleaning machine
EP0583725A1 (fr) 1992-08-17 1994-02-23 Dyckerhoff & Widmann Aktiengesellschaft Dispositif pour séparer la barre tendue d'un ancrage à boulon dans un lieu prédestiné
DE19500091C1 (de) 1995-01-04 1996-04-04 Dyckerhoff & Widmann Ag Verfahren zum Erzeugen einer Sollbruchstelle an einem Zugglied für einen Verpreßanker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH603915A5 (en) 1977-03-09 1978-08-31 Sommer Schenk Ag Swimming pool cleaning machine
EP0583725A1 (fr) 1992-08-17 1994-02-23 Dyckerhoff & Widmann Aktiengesellschaft Dispositif pour séparer la barre tendue d'un ancrage à boulon dans un lieu prédestiné
DE19500091C1 (de) 1995-01-04 1996-04-04 Dyckerhoff & Widmann Ag Verfahren zum Erzeugen einer Sollbruchstelle an einem Zugglied für einen Verpreßanker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110206031A (zh) * 2019-05-08 2019-09-06 江苏科技大学 一种温度响应自紧锚杆及其施工方法
CN110206031B (zh) * 2019-05-08 2020-10-16 江苏科技大学 一种温度响应自紧锚杆及其施工方法

Also Published As

Publication number Publication date
WO2018086781A1 (fr) 2018-05-17
EP3321423B1 (fr) 2020-01-08

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