EP3580403B1 - Dispositif d'ancrage pour paroi moulee precontrainte - Google Patents

Dispositif d'ancrage pour paroi moulee precontrainte Download PDF

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Publication number
EP3580403B1
EP3580403B1 EP18706816.8A EP18706816A EP3580403B1 EP 3580403 B1 EP3580403 B1 EP 3580403B1 EP 18706816 A EP18706816 A EP 18706816A EP 3580403 B1 EP3580403 B1 EP 3580403B1
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EP
European Patent Office
Prior art keywords
prestressing
reinforcement
sleeve
prestressing reinforcement
anchor
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.)
Active
Application number
EP18706816.8A
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German (de)
English (en)
French (fr)
Other versions
EP3580403A1 (fr
Inventor
Marco NOVARIN
Bertrand Steff De Verninac
Thierry JEANMAIRE
Nicolas DEMEY
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.)
Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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Publication of EP3580403A1 publication Critical patent/EP3580403A1/fr
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    • 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
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • 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
    • E02D5/18—Bulkheads or similar walls made solely of concrete in situ

Definitions

  • the subject of the invention is an anchoring device for prestressed diaphragm wall.
  • Such a diaphragm wall is a reinforced concrete structure to which prestressing cables are added. It is generally obtained by excavating a necessary volume of soil (earth or rock), the dimensions of which are chosen according to the capacities desired for the diaphragm wall.
  • WO 2014135768 A1 , AT 397522 B And GB 2120304 A disclose examples of prestressed diaphragm wall.
  • each prestressing cable may present eccentricity variations in the thickness of the diaphragm wall, following a profile determined in the construction project calculation note.
  • drilling mud for example bentonite mud
  • a reinforcement cage intended to reinforce the concrete of the diaphragm wall is lowered into the excavated volume and filled with mud.
  • Metal sheaths forming prestressing conduits are inserted into the reinforcement cage.
  • Prestressing cables are then threaded into the sheaths and anchored in their lower parts.
  • US 4934118A And US 5079879 A describe systems for anchoring prestressing cables.
  • This concrete gradually replaces the drilling mud which is simultaneously pumped.
  • the diaphragm wall is formed when the concrete has set and reached a mechanical strength deemed sufficient.
  • the execution of the diaphragm wall is completed by the injection of cement grout into the sheaths receiving the prestressing cables.
  • Such prestressing of the diaphragm wall makes it possible to reduce its thickness with equal resistance (compared to a diaphragm wall without prestressing cable).
  • the manufacturing process described above is complex to carry out, since it requires putting in place the sheaths forming prestressing conduits, the prestressing cables, anchoring these cables and injecting the prestressing sheaths with cement grout.
  • Another disadvantage lies in the uncertain quality of the anchoring, linked to the possible heterogeneities of the concrete which may include localized defects such as inclusions of water, drilling mud or soil.
  • prestressing cables are subject to external attacks, in particular corrosion, and it is not uncommon for the cables to corrode locally before installation and complete hardening of the concrete and the injection grout, this corrosion impacting significantly the capacity and safety of the wall.
  • the aim of the invention is to at least partially remedy the drawbacks described above.
  • the subject of the invention is an anchoring device for a pre-stressed diaphragm wall, comprising the characteristics of claim 1.
  • the method of manufacturing the diaphragm wall is simplified, since the anchoring device is pre-fabricated.
  • the anchoring device according to the present invention also makes it possible to ensure effective anchoring and tensioning of each prestressing reinforcement.
  • each prestressing reinforcement is protected against corrosion, including during the manufacture of the diaphragm wall.
  • the anti-corrosion coating comprises a protective sheath of the prestressing reinforcement in a part of the prestressing reinforcement arranged outside the sleeve, and/or the anti-corrosion coating comprises a material for coating the reinforcement. prestressing in a part of the prestressing reinforcement arranged outside the sleeve.
  • the anti-corrosion coating of the sealing part comprises the sealing material placed in contact with the prestressing reinforcement in the socket.
  • the socket comprises an external surface provided with roughness.
  • the roughnesses consist of ribs and/or ringed beads.
  • the device comprises a sheath for encapsulating a sheath of the anchoring sleeve.
  • said at least one prestressing reinforcement comprises several wires spread out and folded back on themselves in the anchoring sleeve.
  • the sealing material is a mortar, for example of the ultra-high performance fiber type or a cement grout.
  • the length of the anchoring sleeve is between 2% and 50% of the length of the prestressing reinforcement, preferably between 2% and 20%.
  • the device comprises a waterproof plug in an overlap zone between a part of said at least one prestressing reinforcement in the anchoring sleeve and a part of said at least one prestressing reinforcement outside the anchoring sleeve.
  • the invention also relates to a pre-stressed diaphragm wall according to claim 9 comprising at least one anchoring device as described in claim 1, in which the anchoring sleeve is sealed to a portion of the diaphragm wall.
  • the subject of the invention is an anchoring device for a diaphragm wall prestressed.
  • the anchoring device is referenced 1 in the figures, while the pre-stressed diaphragm wall is referenced 2.
  • the anchoring device 1 is now described in detail according to three embodiments.
  • the anchoring device 1 comprises at least one prestressing reinforcement 3.
  • the anchoring device 1 comprises a plurality of prestressing reinforcements 3.
  • the prestressing reinforcement(s) 3 form part of a cable.
  • a cable C comprising three prestressing reinforcements 3, seven reinforcements on the cross-sectional views 1A and 1B.
  • the cable C comprises at least one prestressing reinforcement 3
  • the diaphragm wall 2 may comprise several cables C comprising at least one prestressing reinforcement each.
  • the prestressing reinforcements 3 are for example strands.
  • Each prestressing reinforcement 3 includes an anti-corrosion coating 4, detailed later, over its entire length.
  • the anchoring device 1 also includes a sleeve 5 enveloping the prestressing reinforcements 3.
  • the socket 5 anchors the prestressing reinforcements 3 in the diaphragm wall 2.
  • the sleeve 5 comprises a sealing material so as to coat each prestressing reinforcement 3.
  • the prestressing reinforcements have the same length denoted La.
  • the invention is not limited to the illustrated embodiments, and it is possible that the reinforcements have lengths La different from each other.
  • Socket 5 has a length denoted Ld.
  • the length Ld of the anchoring sleeve 5 is strictly less than the length La of the prestressing reinforcements 3.
  • the length Ld of the anchoring sleeve 5 is strictly less than the smallest length of the prestressing reinforcements 3, which ensures that each prestressing reinforcement 3 can actually be placed in tension to prestress the diaphragm wall.
  • the length of the sleeve is between 2% and 50% of the length of the reinforcement.
  • the length of the sleeve is between 2% and 20% of the length of the reinforcement.
  • Each prestressing reinforcement 3 has a slenderness of between 10 and 30, for example of the order of 20.
  • slenderness we mean a ratio between length and diameter of the socket.
  • the prestressing reinforcement 3 is adaptable to numerous configurations of molded walls, including including cluttered rebar cages.
  • each prestressing reinforcement 3 comprises an anti-corrosion coating.
  • the sleeve 5 comprises a sheath 6 made from the sealing material.
  • the sheath 6 has a generally cylindrical shape.
  • the sheath 6 comprises a curved side wall 7 and two opposite bases 8, 9.
  • the base 9 forms the bottom of the sheath 6.
  • the sleeve 5 also includes a sheath 10 for encapsulating the sheath 6.
  • the encapsulation sheath 10 forms the anchor of the anchoring device 1.
  • the socket does not have an encapsulation sheath 10.
  • the sheath 6 participates in the anchoring of the anchoring device 1.
  • the encapsulation sheath 10 is substantially of the same length as the sheath 6.
  • each prestressing reinforcement 3 is partially inserted into the socket 5.
  • Each frame comprises a first part, 11, otherwise called the running part, and a second part, 12, otherwise called the sealing part.
  • the anchoring device 1 comprises a sheath of individual protection 31 of each prestressing reinforcement 3 and/or a coating material 32 of each prestressing reinforcement 3.
  • coating material is meant a material which has a sufficiently low shear resistance to leave the prestressing reinforcement 3 free to slide.
  • the coating material is flexible, to the extent that the shear force can be considered negligible compared to the force developed by the prestressing reinforcement during its tensioning.
  • the coating material is in a solid state, in the sense that it does not flow, so that the coating is stable.
  • the coating material is for example pasty or semi-pasty.
  • the coating material contributes to the anti-corrosion protection of the prestressing reinforcement.
  • This is, for example, a grease or a wax.
  • the protective sheath is for example made from high density polyethylene (HDPE).
  • HDPE high density polyethylene
  • each prestressing reinforcement 3 is bare, that is to say it does not include any coating material or protective sheath.
  • the sealing part 12 is placed entirely in the socket 5.
  • the current part 11 is arranged mainly outside the socket 5.
  • the current part enters the socket over a short length, for example of the order of 5 cm to 10 cm.
  • each prestressing reinforcement 3 includes an anti-corrosion coating.
  • the anti-corrosion coating of the current part 11 comprises the protective sheath 31 and/or the coating material 32.
  • the anti-corrosion coating of the sealing part 12 comprises the sealing material placed in direct contact with the prestressing reinforcement 3.
  • the anchoring device 1 comprises at least one waterproof plug to ensure the tightness of the anchoring sleeve 5.
  • the waterproof plug is preferably positioned on the base 8 of the sleeve 5 interfacing between the current part 11 and the sealing part 12 of the prestressing reinforcements 3.
  • the anchoring device comprises a first plug and a second plug.
  • the first plug 13 is positioned on the base 8.
  • the second cap 14 is positioned under the second base 9.
  • the plugs are advantageously made from elastomeric material.
  • the socket 5 comprises an external surface 15 provided with roughnesses 16.
  • the external surface 15 is that of the encapsulation sheath 10 (for figures 1 And 2 ) or that of sheath 6 (for the Figure 3 ).
  • the roughnesses 16 form hooks ensuring better anchoring of the anchoring device 1 in the diaphragm wall 2.
  • the roughnesses 16 are for example constituted by ribs and/or corrugated beads (rings).
  • each of the prestressing reinforcements 3 comprises several wires.
  • the reinforcement can be a strand with seven wires, in a joined bundle with a central wire following the average (rectilinear) route and six peripheral wires in a helix.
  • each of the prestressing reinforcements 3 comprises several wires spread out and folded on themselves in the anchoring sleeve, in fold zones denoted 17.
  • the sealing material of the socket 5 is a mortar, for example of the ultra-high performance fiber-reinforced concrete type (known by the acronym BFUHP) or a cement grout.
  • the encapsulation sheath ensures good confinement and good fit of the socket.
  • ultra-high performance concrete type mortar is advantageous because it ensures the sealing of reinforcements with a straight or slightly undulated path.
  • the anchoring device 1 also comprises an anchoring head 18 or active anchor 18 for each cable and/or prestressing reinforcement 3, by which each reinforcement is put in tension, as visible in the Figure 4 .
  • the anchoring device 1 also includes one or more spacers 20 of the prestressing reinforcements 3.
  • the spacer 20 makes it possible to space the prestressing reinforcements 3 from each other, in order to ensure that each of them is bathed in the sealing material and that the layout has undulations.
  • each prestressing reinforcement 3 is provided with a crimped sleeve at its lower end, embedded in the sealing part.
  • Each crimped sleeve is advantageously made from ductile, plasticized steel, stamped on the end of the reinforcement.
  • the crimped sleeves ensure good anchoring of the prestressing reinforcement in the sheath.
  • each anchoring device advantageously corresponds to a cable.
  • Each cable comprises at least one prestressing reinforcement, and often, a plurality of prestressing reinforcements.
  • Each cable corresponds to a socket and an anchor head.
  • the anti-corrosion coating 4 comprises the sealing material of the sheath 6, in the sealing part 12 and the sheath 31 and/or the coating material 32 in the current part 11.
  • the invention also relates to the molded wall 2 comprising at least one anchoring device 1.
  • the molded wall also includes a reinforcement cage 19.
  • the reinforcing cage 19 is passive, that is to say stressed proportionally to the actions to which the molded wall 2 is subjected.
  • the anchoring devices 1 are arranged in the reinforcement cage, preferably being held in position in the reinforcement cage.
  • the assembly 21 is arranged in a volume V.
  • Volume V is filled by assembly 21 and by a resistant material, such as concrete.
  • the volume V filled with drilling mud is maintained at a constant level by a drilling mud, for example a bentonite type mud, in order to prevent landslides of the vertical walls of the ground and maintain the volume V according to the desired dimensions.
  • a drilling mud for example a bentonite type mud
  • the diaphragm wall 2 is formed when the concrete has set and reached a mechanical strength deemed sufficient.
  • each prestressing reinforcement 3 in tension, so as to pre-stress the molded wall.
  • the anchoring devices 1 are entirely manufactured before the prestressed diaphragm wall 2, which makes it possible to significantly simplify the manufacturing process of the prestressed diaphragm wall compared to the prior art.
  • the prior manufacture of the anchoring devices 1 allows control of the quality of sealing of each prestressing reinforcement 3 to the sleeve 5 which cannot be equaled in the event of injection of sealing material during the manufacture of the molded wall 2.
  • each prestressing reinforcement 3 of each anchoring device 1 makes it possible to prevent the devices 1 from being corroded during the manufacture of the prestressed diaphragm wall 2, even if the duration of construction of the diaphragm wall extends over several weeks.
  • each anchoring device 1 is devoid of any sheath forming a conduit for the prestressing cables in the reinforcement cage (reinforced concrete).
  • each reinforcement 3 slides in an individual sheath 31 which is associated with it and/or thanks to the coating material 32, which allows individual tensioning of each reinforcement which does not is not always permitted by the use of a collective conduit according to the prior art.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP18706816.8A 2017-02-13 2018-02-13 Dispositif d'ancrage pour paroi moulee precontrainte Active EP3580403B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1751164A FR3062862B1 (fr) 2017-02-13 2017-02-13 Dispositif d'ancrage pour paroi moulee precontrainte
PCT/FR2018/050337 WO2018146431A1 (fr) 2017-02-13 2018-02-13 Dispositif d'ancrage pour paroi moulee precontrainte

Publications (2)

Publication Number Publication Date
EP3580403A1 EP3580403A1 (fr) 2019-12-18
EP3580403B1 true EP3580403B1 (fr) 2024-03-13

Family

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EP18706816.8A Active EP3580403B1 (fr) 2017-02-13 2018-02-13 Dispositif d'ancrage pour paroi moulee precontrainte

Country Status (13)

Country Link
US (1) US11377808B2 (es)
EP (1) EP3580403B1 (es)
AU (1) AU2018218297B2 (es)
CA (1) CA3053412A1 (es)
CL (1) CL2019002231A1 (es)
CO (1) CO2019008683A2 (es)
ES (1) ES2974094T3 (es)
FR (1) FR3062862B1 (es)
MX (1) MX2019009618A (es)
PL (1) PL3580403T3 (es)
SA (1) SA519400105B1 (es)
SG (1) SG11201907429XA (es)
WO (1) WO2018146431A1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109680685A (zh) * 2019-02-27 2019-04-26 重庆交通大学 压力分散型抗震预应力锚索
CN110258529B (zh) * 2019-06-04 2021-08-17 鑫龙冶建设工程有限公司 一种后张预应力地下连续墙及其施工方法
US11982086B2 (en) * 2020-12-16 2024-05-14 Iowa State University Research Foundation, Inc. Ultra high-performance concrete bond anchor
CN114575331B (zh) * 2022-01-19 2024-03-15 中天建设集团有限公司 预应力异形地下连续墙及其施工方法
CN115419050B (zh) * 2022-08-05 2024-08-06 浙江省建筑设计研究院 预埋套筒组合式地下连续墙及其施工方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079879A (en) * 1987-08-24 1992-01-14 Alan Rodriguez Anti-corrosive post-tensioning anchorage system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069677A (en) * 1975-06-20 1978-01-24 Kabushiki Kaisha Nitto Tekuno Group Anchor and method for constructing same
GB2120304B (en) * 1982-05-20 1985-11-20 Gkn Keller Gmbh Forming concrete piles
DE3737393A1 (de) * 1987-11-04 1989-05-18 Strabag Bau Ag Spannglied aus faserverbundwerkstoffen sowie verfahren und einrichtung zum spannen und zur verankerung eines solchen spanngliedes
AT397522B (de) * 1989-08-09 1994-04-25 Sonderbau Gmbh Verfahren zur herstellung eines säulenförmigen körpers aus beton od. dgl.
GB9708740D0 (en) * 1997-04-29 1997-06-18 Univ Aberdeen Ground anchorage testing system
FR3002956B1 (fr) * 2013-03-05 2015-04-10 Soletanche Freyssinet Paroi moulee precontrainte et procede de realisation d'une telle paroi

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079879A (en) * 1987-08-24 1992-01-14 Alan Rodriguez Anti-corrosive post-tensioning anchorage system

Also Published As

Publication number Publication date
BR112019015706A2 (pt) 2020-03-24
FR3062862A1 (fr) 2018-08-17
US20200040543A1 (en) 2020-02-06
FR3062862B1 (fr) 2019-04-05
US11377808B2 (en) 2022-07-05
SA519400105B1 (ar) 2022-11-25
EP3580403A1 (fr) 2019-12-18
AU2018218297B2 (en) 2023-08-03
CL2019002231A1 (es) 2019-12-27
CO2019008683A2 (es) 2019-10-31
CA3053412A1 (fr) 2018-08-16
MX2019009618A (es) 2019-10-09
AU2018218297A1 (en) 2019-08-29
WO2018146431A1 (fr) 2018-08-16
SG11201907429XA (en) 2019-09-27
ES2974094T3 (es) 2024-06-25
PL3580403T3 (pl) 2024-04-29

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