EP3420143B1 - Elektrisch isolierter und korrosionsbeständiger mikropfahl oder verankerung - Google Patents

Elektrisch isolierter und korrosionsbeständiger mikropfahl oder verankerung Download PDF

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Publication number
EP3420143B1
EP3420143B1 EP16708211.4A EP16708211A EP3420143B1 EP 3420143 B1 EP3420143 B1 EP 3420143B1 EP 16708211 A EP16708211 A EP 16708211A EP 3420143 B1 EP3420143 B1 EP 3420143B1
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EP
European Patent Office
Prior art keywords
micropile
tie
cover
hardening material
linear metallic
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.)
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Application number
EP16708211.4A
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English (en)
French (fr)
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EP3420143A1 (de
Inventor
Giancarlo Rezzonico
Aurelio Muttoni
Franco LURATI
Miguel Fernandez Ruiz
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École Polytechnique Fédérale de Lausanne
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École Polytechnique Fédérale de Lausanne
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Publication of EP3420143A1 publication Critical patent/EP3420143A1/de
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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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water

Definitions

  • the present invention relates to a micropile or tie that is used in construction of buildings or other structures for the anchoring of their structural parts in the ground. More particularly, it concerns a micropile or tie that is fully protected against corrosion.
  • Micropiles or ties are generally composed of linear steel members covered by a cement mortar.
  • the steel members may have different diameters and shapes and usually allow screwing or fixing of more elements in order to increase their length to the required one.
  • the steel members are introduced inside a hole drilled in the soil, masonry work, concrete or other materials.
  • the micropiles or ties may carry compression or tension forces from one end to the other.
  • the internal strength of the micropiles or ties essentially depends on their diameter. Without any particular protective action, the steel members are subjected to corrosion, which leads to a reduction of their diameter, and thus to their strength. Therefore, it has been found necessary to protect the steel members from corrosion.
  • the most common solution consists to arrange a protection duct, in plastics or steel, around the steel member and to inject a mortar inside said protection duct. Thereafter, this protected steel member is positioned inside the drilled hole and a mortar is injected between the duct and the drilled hole.
  • this solution still presents two weaknesses. Firstly, the ends of the micropiles or ties, which are not covered by the duct, are not protected against corrosion. Secondly, the connecting regions between two adjacent steel members are not covered by the duct and/or by the mortar. Said regions may thus be subjected to corrosion.
  • Chinese Utility Model No. CN 202298615 U discloses a micropile or tie according to the preamble of claim 1.
  • Japanese Patent Publication No. JP 2007-332661 discloses a micropile or tie of the type comprising a linear element that is secured to a bearing/anchor plate acting as load-transfer element by means of a fixing nut, which fixing nut forms part of a head element that is located inside a head cap that is filled with a filler, such as grease.
  • the bearing/anchor plate is located outside of the head cap and the head cap is attached to the bearing/anchor plate by means of bolts and washers.
  • French Patent Publication No. FR 2 554 149 A1 discloses a traction rod for concrete works which is used for prestressing/tensioning purposes.
  • a first aim of the present invention is therefore to provide a micropile or tie, wherein the above mentioned drawbacks are avoided.
  • a second aim of the present invention is to provide a micropile or tie permitting a suitable transfer of loads from the structure to the steel member.
  • the present invention relates to a micropile or tie according to claim 1.
  • micropile or tie of the present invention is fully protected against corrosion and electrically isolated.
  • a drilled hole 1 formed in the ground 2.
  • a micropile 10 In this drilled hole is engaged a micropile 10.
  • Spacers 3 are disposed along the drilled hole 1 to keep the micropile 10 distant from the lateral surface of the drilled hole 1.
  • the hollow space between the micropile 10 and the lateral surface of the drilled hole 1 is filled with a hardening material, such as cement mortar.
  • the micropile 10 comprises two threaded steel rods, respectively a first rod 11 and a second rod 12, that are longitudinally spaced-apart and connected to each other through a coupling element 13.
  • the coupling element 13 may advantageously include a threaded through-hole adapted to receive the lower end 11b of the first rod 11 and the upper end 12a of the second rod 12.
  • the first rod 11, respectively the second rod 12 is positioned inside a first external plastic duct 14, respectively a second external plastic duct 15.
  • These external ducts 14 and 15 are advantageously filled with a hardening material 16, such as cement mortar, before positioning the first and second rods 11, 12 surrounded by said external ducts 14, 15 inside the drilled hole 1.
  • first and second rods 11, 12 are electrically-isolated and corrosion-resistant along the length extending between their upper ends 11a, 12a and their lower ends 11b, 12b.
  • an intermediate external plastic duct 19 may advantageously be disposed around said coupling element 13, said lower end 11b and said upper end 12a, said intermediate external duct 19 being sealed to the first and second external ducts 11, 12. This sealing operation can be done by different manner, such as by heating, screwing or gluing.
  • this intermediate external duct 19 may advantageously be filled with a hardening material, such as cement mortar, thus electrically isolating the portion of the micropile 10 extending between the lower end 11b and the upper end 12a.
  • the first, second and intermediate external ducts 14, 15 and 19 may advantageously have a corrugated profile at their periphery.
  • the lower end 12b of the second rod 12 may advantageously be protected by a protection piece 17 threadly connected thereof and a cap 18 covering said protection piece 17 and sealed to the second external duct 15.
  • the upper end 11a of the first rod 11 partially extends outside of the drilled hole 1 and outside of the first external duct 14 in the upper part of the micropile 10. Said upper end 11a is threadly connected to a head element 20.
  • This head element 20 is positioned inside or embedded within the structure 5 that is supported on the ground 2.
  • This head element 20 comprises three nuts 21 screwed on the first rod 11 and two supporting plates 23 disposed between two adjacent nuts 21 and blocked thereby.
  • An additional reinforcing element 22, such as a helical metallic thread, may advantageously be included in the head element 20.
  • the head element 20 is surrounded by a plastic cover 27, 28 so as to protect it against corrosion.
  • the plastic cover 27, 28 is filled with a hardening material, such as cement mortar, before its sealing to the first external duct 14.
  • a hardening material such as cement mortar
  • the plastic cover may advantageously have a conical shape, said conical shape assuring the load transfer between the micropile 10 and the structure 5.
  • the plastic cover may comprise a lower part 27 and an upper part 28 sealed thereto, the lower part 27 being corrugated to improve the load transfer between the micropile 10 and the structure 5.
  • the micropile 10 is electrically controlled by using a wire 25 that is electrically connected to the first rod 11 through one of the supporting plates 23, said wire permitting the measurement of the electric resistance of said first rod.
  • the hardening material may advantageously be supplied to the intermediate external duct 19 through a first tube 24, said first tube having one end connected to a tank containing the hardening material and one other end positioned inside the intermediate external duct 19.
  • a second tube 26 may be provided to ensure that the air and the hardening material in excess can be expelled from the intermediate external duct 19.
  • this second tube 26 has one end positioned inside the intermediate external duct 19 and one other end positioned inside the plastic cover 27, 28.
  • the micropile 10 comprises an intermediate third rod 11' disposed between the first rod 11 and the second rod 12, said third rod 11' being connected to said first rod 11 through the first coupling element 13 and to the second rod 12 through a second coupling element 13'.
  • This third rod 11' is positioned inside a third external duct 14' filled with the hardening material 16.
  • a second intermediate external duct 19' is disposed around the second coupling element 13' and sealed to the second and third external ducts 15 and 14'.
  • a hardening material is supplied to the second intermediate external duct 19' through first and second tubes 24 and 24' connected together via an intermediate tube 24", said first tube 24 having one end connected to a tank containing the hardening material and one other end positioned inside the first intermediate external duct 19 surrounding the first coupling element 13 and said second tube 24' having one end positioned inside said first intermediate external duct 19 and one other end positioned inside the second intermediate external duct 19'.
  • the air and the hardening material is supplied to the first intermediate external duct 19 through a third tube 26' having one end positioned inside the second intermediate external duct 19' and one other end positioned inside said first intermediate external duct 19.
  • the micropile 10 may comprise several intermediate rods between the first and second rods 11, 12.
  • the micropile may comprise an additional external duct surrounding this rod, an additional coupling element and an additional intermediate external duct surrounding this coupling element.
  • the hardening material may be supplied to the intermediate external duct that surrounds the coupling element connecting the last intermediate rod to the second rod 12 through a first series of tubes fluidically connecting two consecutive intermediate external ducts, said tubes being connected together via a series of intermediate tube.
  • the hardening material may be supplied to the other intermediate external ducts through a second series of tubes fluidically connecting two consecutive intermediate external ducts.
  • the plastic cover of this embodiment comprises three successive portions 31, 32, 33, respectively a lower end and an upper end portions 31 and 33 having a conical shape and a cylindrical central portion 32 positioned therebetween.
  • This plastic cover may be formed in two parts, a first part including the lower end portion 31 and the lower half of the central portion 32, and a second part including the upper end portion 33 and the upper half of the central portion 32.
  • the two parts may be connected together through a sealing element, such as a shrinkable plastic film 34, disposed around the central portion 32.
  • this embodiment comprises only one supporting plate 23.
  • the embodiment illustrated in Figure 4 differs from the one of Figure 3 by the fact that the central portion 32 of the plastic cover is corrugated, thus improving the load transfer between the head element 20 and the structure 5. Furthermore, this embodiment comprises two supporting plates 23.
  • the embodiment illustrated in Figure 5 differs from the one of Figure 3 by the fact that the micropile 10 comprises a single rod 11, without a coupling element 13 and a second rod 12.
  • the hardening material is supplied to the plastic cover surrounding the head 20 by a single tube 35, having one end connected to the tank containing the hardening material and one other end positioned inside said plastic cover.
  • micropile or tie of the present invention may have any orientation relative to the ground.
  • the micropile or tie of the present invention may be horizontally orientated.

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)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Piles And Underground Anchors (AREA)

Claims (13)

  1. Mikropfahl oder Zuganker (10) zum Verbinden einer Struktur (5) mit einem Boden (2), wobei der Mikropfahl oder Zuganker Folgendes umfasst:
    - mindestens ein lineares Metallelement (11),
    - mindestens eine äußere Korrosionsschutzleitung (14), innerhalb derer das lineare Metallelement (11) angeordnet ist, wobei die äußere Leitung mit einem Härtungsmaterial gefüllt ist,
    - ein Kopfelement (20), das mit einem oberen Ende (11a) des linearen Metallelements (11) verbunden ist,
    wobei das Kopfelement (20) von einer Abdeckung (27, 28; 31, 32, 33) zum Schutz gegen Korrosion umgeben ist, dadurch gekennzeichnet, dass die Abdeckung (27, 28; 31, 32, 33) direkt an der äußeren Leitung (14) abgedichtet ist, dass das Kopfelement (20) mit dem oberen Ende (11a) des linearen Metallelements (11) durch Gewinde verbunden ist, dass die Abdeckung (27, 28; 31, 32, 33) mit einem Härtungsmaterial gefüllt ist, und dass das Kopfelement (20) weiter mindestens eine Stützplatte (23) umfasst, die sich im Inneren der Abdeckung (27, 28; 31, 32, 33) befindet, die mit dem Härtungsmaterial gefüllt ist, um die Lastübertragung zwischen dem linearen Metallelement (11), dem Härtungsmaterial und der Struktur (5) sicherzustellen.
  2. Mikropfahl oder Zuganker (10) nach Anspruch 1, wobei die Abdeckung (27, 28; 31, 32, 33) mindestens einen gewellten Abschnitt (27, 32) einschließt, der die Lastübertragung zwischen dem Mikropfahl oder Zuganker (10) und der Struktur (5) verbessert.
  3. Mikropfahl oder Zuganker (10) nach einem der vorstehenden Ansprüche, wobei die Abdeckung (27, 28) eine konische Form aufweist.
  4. Mikropfahl oder Zuganker (10) nach Anspruch 3, wobei die Abdeckung (27, 28) durch eine gewellte konische Fläche (27) definiert ist.
  5. Mikropfahl oder Zuganker (10) nach einem der Ansprüche 1-2, wobei die Abdeckung (31, 32, 33) zwei konische Endabschnitte (31, 33) und einen dazwischen angeordneten zylindrischen zentralen Abschnitt (32) aufweist.
  6. Mikropfahl oder Zuganker (10) nach Anspruch 5, wobei der zentrale Abschnitt (32) der Abdeckung durch eine gewellte laterale Fläche definiert ist.
  7. Mikropfahl oder Zuganker (10) nach einem der vorstehenden Ansprüche, umfassend mindestens zwei lineare Metallelemente (11, 12), die durch ein Kopplungselement (13) durch Gewinde miteinander verbunden sind, wobei jedes lineare Metallelement (11, 12) durch eine separate äußere Leitung (14, 15) geschützt ist und das Kopplungselement (13) durch eine äußere Zwischenleitung (19) geschützt ist, die zwischen den separaten äußeren Leitungen (14, 15) angeordnet und mit diesen gekoppelt ist.
  8. Mikropfahl oder Zuganker (10) nach einem der vorstehenden Ansprüche, wobei das Kopfelement (20) weiter ein Verstärkungselement (22) zur Verbesserung der Lastübertragung zwischen dem linearen Metallelement (11), dem Härtungsmaterial und der Struktur (5) einschließt.
  9. Mikropfahl oder Zuganker (10) nach einem der vorstehenden Ansprüche, weiter umfassend einen Draht (25), der mit dem linearen Metallelement (11) zur Messung des elektrischen Widerstands desselben elektrisch verbunden ist.
  10. Mikropfahl oder Zuganker (10) nach einem der vorstehenden Ansprüche, weiter umfassend mindestens ein erstes Rohr (35), das zum Füllen der Abdeckung (31, 32, 33) mit dem Härtungsmaterial ausgelegt ist, wobei das erste Rohr ein erstes Ende, das mit einem das Härtungsmaterial enthaltenden Tank verbunden ist, und ein zweites Ende aufweist, das im Inneren der Abdeckung angeordnet ist.
  11. Mikropfahl oder Zuganker (10) nach Anspruch 7, weiter umfassend mindestens ein erstes Rohr (24), das zum Füllen eines Hohlraums der äußeren Zwischenleitung (19), die das Kopplungselement (13) umgibt, mit dem Härtungsmaterial ausgelegt ist, wobei das erste Rohr (24) ein erstes Ende, das mit einem das Härtungsmaterial enthaltenden Tank verbunden ist, und ein zweites Ende aufweist, das innerhalb des Hohlraums angeordnet ist, und mindestens ein zweites Rohr (26), das ein erstes Ende, das innerhalb des Hohlraums angeordnet ist, und ein zweites Ende aufweist, das innerhalb der Abdeckung (27, 28) angeordnet ist.
  12. Mikropfahl oder Zuganker (10) nach einem der vorstehenden Ansprüche, wobei das lineare Metallelement (11, 12) aus Stahl hergestellt ist.
  13. Mikropfahl oder Zuganker (10) nach einem der vorstehenden Ansprüche, wobei das Härtungsmaterial ein Zementmörtel ist.
EP16708211.4A 2016-02-22 2016-02-22 Elektrisch isolierter und korrosionsbeständiger mikropfahl oder verankerung Active EP3420143B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2016/050942 WO2017144941A1 (en) 2016-02-22 2016-02-22 Electrically isolated and corrosion-resistant micropile or tie

Publications (2)

Publication Number Publication Date
EP3420143A1 EP3420143A1 (de) 2019-01-02
EP3420143B1 true EP3420143B1 (de) 2023-06-28

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EP (1) EP3420143B1 (de)
PT (1) PT3420143T (de)
WO (1) WO2017144941A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111764384B (zh) * 2019-10-08 2022-08-05 中国电建集团华东勘测设计研究院有限公司 一种采用单层波纹管和树脂材料实现双层防腐的锚索结构

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554149A1 (fr) * 1983-10-28 1985-05-03 Dyckerhoff & Widmann Ag Organe de traction libre pouvant etre mis en tension, comprenant un ou plusieurs elements de traction tels que des barres, des cables ou des filins d'acier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005098165A1 (en) * 2004-04-08 2005-10-20 Hong Kong Fiberglass Technology Limited Instrumented bars and system
JP4822270B2 (ja) * 2006-06-15 2011-11-24 弘和産業株式会社 アンカーの頭部及び頭部背面機構とアンカー補修方法
CN202298615U (zh) * 2011-08-24 2012-07-04 柳州欧维姆机械股份有限公司 电隔离防护锚索

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554149A1 (fr) * 1983-10-28 1985-05-03 Dyckerhoff & Widmann Ag Organe de traction libre pouvant etre mis en tension, comprenant un ou plusieurs elements de traction tels que des barres, des cables ou des filins d'acier

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PT3420143T (pt) 2023-07-18
WO2017144941A1 (en) 2017-08-31

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