EP3420143A1 - Micropieu ou tirant électriquement isolé et résistant à la corrosion - Google Patents

Micropieu ou tirant électriquement isolé et résistant à la corrosion

Info

Publication number
EP3420143A1
EP3420143A1 EP16708211.4A EP16708211A EP3420143A1 EP 3420143 A1 EP3420143 A1 EP 3420143A1 EP 16708211 A EP16708211 A EP 16708211A EP 3420143 A1 EP3420143 A1 EP 3420143A1
Authority
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.)
Granted
Application number
EP16708211.4A
Other languages
German (de)
English (en)
Other versions
EP3420143B1 (fr
Inventor
Giancarlo Rezzonico
Aurelio Muttoni
Franco LURATI
Miguel Fernandez Ruiz
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.)
Ecole Polytechnique Federale de Lausanne EPFL
Original Assignee
Ecole Polytechnique Federale de Lausanne EPFL
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 Ecole Polytechnique Federale de Lausanne EPFL filed Critical Ecole Polytechnique Federale de Lausanne EPFL
Publication of EP3420143A1 publication Critical patent/EP3420143A1/fr
Application granted granted Critical
Publication of EP3420143B1 publication Critical patent/EP3420143B1/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
    • 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.
  • One solution consists to inject a mortar between the steel member and the surface of the drilled hole. However, in this solution, a contact between the steel member and the soil may accidentally occur. Therefore, this solution does not warrant a full protection of the micropiles or ties.
  • One further solution consists to use stainless steel for the steel member. However, this solution is very expensive and not effective against stray currents.
  • 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.
  • 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 for connecting a structure to a soil, the micropile or tie comprising:
  • the head element is surrounded by a cover for protection against corrosion, said cover being sealed to the external duct and being filled with a hardening material.
  • micropile or tie of the present invention is defined in dependent claims 2 to 15. Thus configured, the micropile or tie of the present invention is fully protected against corrosion and electrically isolated.
  • Figures 1 (a), 1 (b) and 1 (c) are three longitudinal section views of a drilled hole and, thereinside, of a micropile according to a first embodiment of the present invention
  • Figures 1 (b1 ) and 1 (b2) are longitudinal section views similar to Figure 1 (b) but in an alternative embodiment of the present invention
  • Figure 2 is an enlarged view of Figure 1 (a);
  • Figure 3 is a view similar to Figure 2 but in a second embodiment of the present invention.
  • Figure 4 is a view similar to Figure 2 but in a third embodiment of the present invention.
  • Figure 5 is a view similar to Figure 3 but in a fourth embodiment of the present invention.
  • 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 1 1 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 1 1 b of the first rod 1 1 and the upper end 12a of the second rod 12.
  • the first rod 1 1 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 1 1 , 12 surrounded by said external ducts 14, 15 inside the drilled hole 1 .
  • the first and second rods 1 1 1 , 12 are electrically-isolated and corrosion-resistant along the length extending between their upper ends 1 1 a, 12a and their lower ends 1 1 b, 12b. So as to also protect the lower end 1 1 b of the first rod 1 1 and the upper end 12a of the second rod 12 that are connected to the coupling element 13, an intermediate external plastic duct 19 may advantageously be disposed around said coupling element 13, said lower end 1 1 b and said upper end 12a, said intermediate external duct 19 being sealed to the first and second external ducts 1 1 , 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 1 1 b 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 1 1 a of the first rod 1 1 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 1 1 a 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 1 1 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. Accordingly, 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. Furthermore, 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 1 1 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 1 1 ' disposed between the first rod 1 1 and the second rod 12, said third rod 1 1 ' being connected to said first rod 1 1 through the first coupling element 13 and to the second rod 12 through a second coupling element 13'.
  • This third rod 1 1 ' 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 1 1 , 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 1 1 , 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)

Abstract

La présente invention concerne un micropieu ou un tirant pour joindre une structure (5) à un sol (2), le micropieu ou tirant comprenant : - au moins un élément métallique linéaire (11), - au moins un conduit anticorrosion externe (14) à l'intérieur duquel se trouve l'élément métallique linéaire (11), ledit conduit externe étant rempli d'un matériau de durcissement; - un élément de tête (20) relié par filetage à une extrémité supérieure (11a) de l'élément métallique linéaire (11), dans lequel l'élément de tête (20) est entouré d'un cache (27, 28) pour la protection contre la corrosion, ledit cache étant fixé hermétiquement au conduit externe (14) et étant rempli d'un matériau de durcissement.
EP16708211.4A 2016-02-22 2016-02-22 Micropieu ou tirant électriquement isolé et résistant à la corrosion Active EP3420143B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2016/050942 WO2017144941A1 (fr) 2016-02-22 2016-02-22 Micropieu ou tirant électriquement isolé et résistant à la corrosion

Publications (2)

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

Family

ID=55456847

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16708211.4A Active EP3420143B1 (fr) 2016-02-22 2016-02-22 Micropieu ou tirant électriquement isolé et résistant à la corrosion

Country Status (3)

Country Link
EP (1) EP3420143B1 (fr)
PT (1) PT3420143T (fr)
WO (1) WO2017144941A1 (fr)

Families Citing this family (1)

* 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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3339058C2 (de) * 1983-10-28 1987-04-23 Dyckerhoff & Widmann AG, 8000 München Freiliegendes spannbares Zugglied
WO2005098165A1 (fr) * 2004-04-08 2005-10-20 Hong Kong Fiberglass Technology Limited Barres et systeme instrumentes
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

Also Published As

Publication number Publication date
PT3420143T (pt) 2023-07-18
WO2017144941A1 (fr) 2017-08-31
EP3420143B1 (fr) 2023-06-28

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