EP3808899B1 - System and method for destressing stay cables by incorporation of, or substitution by, improved filler material - Google Patents

System and method for destressing stay cables by incorporation of, or substitution by, improved filler material Download PDF

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Publication number
EP3808899B1
EP3808899B1 EP19737802.9A EP19737802A EP3808899B1 EP 3808899 B1 EP3808899 B1 EP 3808899B1 EP 19737802 A EP19737802 A EP 19737802A EP 3808899 B1 EP3808899 B1 EP 3808899B1
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EP
European Patent Office
Prior art keywords
stay cable
detensioning
tensioning
post
tendons
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
EP19737802.9A
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German (de)
English (en)
French (fr)
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EP3808899A1 (en
Inventor
José Manuel ILLESCAS VILLA
Juan Manuel LINERO MOYA
José MARTINEZ SALCEDO
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FCC Construction SA
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FCC Construction SA
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Publication of EP3808899B1 publication Critical patent/EP3808899B1/en
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D11/00—Suspension or cable-stayed bridges
    • E01D11/04—Cable-stayed bridges

Definitions

  • the invention relates to a system and a method for detensioning a stay cable, wherein, in a certain area, the filling material of the stay cable is replaced by another one with improved features or said filling material is incorporated into the stay cable if it initially lacked it.
  • the patent US6701599 B2 discloses demounting a prestressing cable having a sheath, wherein the tendon extends in the sheath and is tensioned between two anchoring devices, and a hardened material fills the sheath around the tendons.
  • EP 1887 139 A1 with the family member Spanish patent ES2377716 T3 proposes a method of demounting a stressing cable between a first anchoring point and a second anchoring point in a structure which includes the steps of releasing a span of the cable from said first and second anchoring points; supporting said span of the cable; and extracting said span from the cable at a distance from at least one of said first and second anchoring points.
  • Document US 9021644 B2 describes a method for replacing a cable of a structure, like a suspension bridge with towers in the structure thereof, which involves placing a set of mobile temporary hangers on the upper cable which is to be replaced, the cable to be replaced is located in the lower portion of these hangers and the cable is removed from the anchors, such that it is maintained thanks to the upper cable. The hangers are moved towards the deck of the bridge in order to remove the cable to be replaced.
  • the present invention relates to a system for detensioning stay cables (100) by incorporating, or replacing with, an improved filling material (125), in a certain area, which is made up of:
  • the invention also relates to a method for detensioning a stay cable (100) anchored and covered with a sheath (110) and cement grout or other types of protections which incorporates the following steps:
  • the present invention in the detensioning of the stay cables which, formed mainly by wires, strands or other types of load-bearing elements, wherein the stay cables can be covered by a collective sheath made of steel, polyethylene or similar, the interface between the strands, wires or load-bearing elements and the sheath can be injected or not with cement grout or another material, which acts as an element for filling and protection against corrosion, and there may also be other types of internal coverings at an individual level for each element or groups of them, such as resin and microspheres in the vicinity of the anchor, and cement grout in the free length require a different treatment which is not envisaged in the state of the art.
  • the proposed system and method enables incorporating a material with improved features to the stay cable whereon fastening or retaining elements can be placed in order to create auxiliary anchoring points whereon it can act to transfer the load from the stay cable to other secondary or support elements for the detensioning thereof.
  • the detensioning of stay cables which are injected with resin and/or microspheres in the area of the anchor, and cement grout in the free length can be carried out, enabling acting on the stay cable as a whole by acting on the free length of the stay cable by transferring the load from the stay cable to post-tensioning bars or tendons by means of friction clamps fixed to the improved filling material incorporated in an area of the stay cable.
  • the present invention also enables the detensioning, by means of improved filling material and a friction clamp, in those stay cables of any type wherein it is not possible to connect to the rear portion of the anchor due to a lack of sufficient length of the strands after the anchor, or due to other causes in general, whether they be stay cables made up of self-protected strands or of strands, wires or other types of cable with any type of protection, regardless of the type of anchor they have (wedges, wedges with resin, cold upset butt welds, etc.).
  • the invention relates to a system and method for detensioning stay cables (100) by incorporating, or replacing with, improved filling material.
  • the system is adapted for structural elements made up of the stay cables (100) to be destressed, which tend to include an adjustable active anchor and a passive anchor not able to be adjusted. It is common for both anchors to be protected by an enveloping cowling filled with grease or wax in the case of the active anchor and filler made of cement grout or also grease or wax in the case of the passive anchor.
  • a centring element (105) is usually arranged to concentrate the bundle of strands or wires (120).
  • the free length of the stay cable (100) is covered with a collective sheath (110) of High-Density Polyethylene (HDPE) or another generally plastic or metal material, and is injected with cement grout or another protective material.
  • HDPE High-Density Polyethylene
  • stay cables (100) which are injected with resin and microspheres in the area of the anchor or another type of collective filling material, and cement grout, or similar material, in the free length require a different treatment.
  • the stay cable (100) must be acted on as a whole, either from the rear portion thereof by means of a multi-strand jack, or acting in the free length of the stay cable by transferring the load from the stay cable to post-tensioning bars or tendons by means of friction clamps, although if the latter is not possible, given that the strength and adhesion features of the filling materials of the free length of the very strands or wires of the stay cable do not enable the forces of the stay cable to be transferred by friction.
  • the present invention entails an improvement of the strength and adhesion of the filling material, by means of incorporating, or replacing with, a filling material with improved features.
  • the protective sheath (110) is cut, if the stay cable was equipped with that element, in the free length of the stay cable (100) in the lower area near the deck (300) or in another area if convenient. To do so, a length of several metres is uncovered, which can be approximately 3m and a centred area of that uncovered area is cleaned, which can be approximately 2.65m, until the remains of the cement grout or another filling material, adhered to the strands or wires (120) are completely removed.
  • the cleaning of both the outer and inner strands or wires (120) can be carried out, preferably, with a jet of water.
  • a material with improved features is injected, generally consisting of a resin-based material or similar with or without a load of aggregates in order to ensure an area with improved strength and adhesion, suitable for placing friction or retention clamps in said areas.
  • auxiliary elements are installed which act as a formwork at both ends, such as metal tube halves (130), leaving a free area and without injecting between both sides to be able to subsequently operate in order to cut the load-bearing elements or strands (120) of the stay cable (100).
  • the two halves of the tube are joined with provisional flanges (135) and a special filling material, for example resin, is injected into it through fittings (140) located along the tube. Between the two halves of the tube (130), in the lateral joining areas thereof, there are some shims and a seal.
  • a special filling material for example resin
  • the fittings (140) and the provisional flanges (135) of the tube (130) are removed and the two clamps (145), upper and lower, made up of two portions (150) joined by threaded bars (155) are installed.
  • the tightening of the threaded bars (155) so that the stay cable (100) is secured is preferably performed with a tensioner acting in a distributed and progressive manner on each of them (155).
  • a reaction structure in the shape of a yoke (160) is installed as shown in Figs. 8 and 9 , and which supports both clamps (145) from above and below as shown in Figs. 10 , 11 and 12 .
  • Both yoke-shaped structures (160) are joined to each other by post- tensioning bars or tendons (165) and in the middle of said structures the stay cable (100) to be destressed is located.
  • post-tensioning bars or tendons (165) are used, one on each side of the stay cable (100), although another number could be used, according to the structural needs.
  • Each of these yoke-shaped structures (160) is made up of two halves which are joined together and therefore secure the guy line (100) and the post- tensioning bars (165) by means of screws and threaded bars (170).
  • the post-tensioning bars or tendons (165) are actuated by means of two cylinders or hydraulic jacks (180) with the aim of transferring the load from the stay cable (100) thereto as shown in Figs. 10 , 11 and 12 .
  • These cylinders (180) are equipped with a tensioning bridge (185) in order to be able to retain the strength of the post-tensioning bars or tendons (165) mechanically.
  • the hydraulic cylinders (180) are used to transfer the force from the mechanical locking of the post-tensioning bars or tendons to the hydraulic cylinders. At that time, the retaining nuts located on the tensioning bridges (185) are loosened and pressure is then relieved and the hydraulic cylinders (180) are retracted. If the stroke of the jack or hydraulic cylinder (180) is exhausted, the retaining nuts of the stressing chairs (185) will be fastened and the cylinders (180) will be extended again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Processing Of Terminals (AREA)
  • Insulated Conductors (AREA)
EP19737802.9A 2018-06-12 2019-06-11 System and method for destressing stay cables by incorporation of, or substitution by, improved filler material Active EP3808899B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201830573A ES2735145B2 (es) 2018-06-12 2018-06-12 Sistema y procedimiento de destesado de tirantes por incorporación de, o sustitución por, material de relleno mejorado
PCT/ES2019/070405 WO2019238996A1 (es) 2018-06-12 2019-06-11 Sistema y procedimiento de destesado de tirantes por incorporacion de, o sustitucion por, material de relleno mejorado

Publications (2)

Publication Number Publication Date
EP3808899A1 EP3808899A1 (en) 2021-04-21
EP3808899B1 true EP3808899B1 (en) 2023-03-08

Family

ID=67226279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19737802.9A Active EP3808899B1 (en) 2018-06-12 2019-06-11 System and method for destressing stay cables by incorporation of, or substitution by, improved filler material

Country Status (5)

Country Link
EP (1) EP3808899B1 (es)
AU (1) AU2019286812B2 (es)
ES (2) ES2735145B2 (es)
PT (1) PT3808899T (es)
WO (1) WO2019238996A1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT3936738T (pt) * 2020-07-15 2023-05-10 Soletanche Freyssinet Alívio de tensão de cabo
FR3119403B1 (fr) 2021-01-29 2023-01-20 Soletanche Freyssinet Système de pontage et procédé de mise en œuvre
FR3112561B1 (fr) * 2020-07-15 2022-07-15 Soletanche Freyssinet Dispositif de pontage et procédé de détension et de découpe
WO2023046298A1 (en) * 2021-09-24 2023-03-30 Vsl International Ag A detensioning system and a method for detensioning a structural element or a tensioning element
KR102488197B1 (ko) * 2022-06-17 2023-01-13 다올이앤씨 주식회사 사장교 케이블 보수 방법 및 이에 사용되는 브라켓

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3778869A (en) * 1971-03-15 1973-12-18 American Stress Wire Corp Apparatus for detensioning stranded cable
JPS58213955A (ja) * 1982-06-05 1983-12-13 住友電気工業株式会社 プレストレストコンクリ−ト構造物の鋼材の切断・定着方法
GB8924896D0 (en) * 1989-11-03 1989-12-20 Manuf Aceros Caucho Sa Anchorage for stressed reinforcing tendon
FR2691737A1 (fr) * 1992-05-26 1993-12-03 Freyssinet Int & Co Perfectionnements aux dispositifs pour effectuer des ancrages intermédiaires sur des câbles de précontrainte.
FR2745829B1 (fr) * 1996-03-08 1999-09-24 Baudin Chateauneuf Procede et dispositif pour le remplacement d'un cable ou organe analogue de transmission d'efforts
FR2818676B1 (fr) 2000-12-27 2003-03-07 Freyssinet Int Stup Procede de demontage d'un cable de precontrainte et dispositif pour la mise en oeuvre
FR2904637A1 (fr) * 2006-08-02 2008-02-08 Freyssinet Soc Par Actions Sim Procede de demontage d'un cable tendu, systeme et dispositifs associes.
DE102007017697A1 (de) * 2007-04-14 2008-10-23 Dywidag-Systems International Gmbh Zugglied für Bauwerke sowie Verfahren zu dessen Herstellung
JP5572668B2 (ja) 2012-06-01 2014-08-13 株式会社Ｉｈｉインフラシステム 斜ケーブルの取り替え方法及び斜ケーブル取り替え用仮ハンガー
CN106192763B (zh) * 2016-08-17 2019-02-22 江苏法尔胜缆索有限公司 一种拉索放张施工的方法

Also Published As

Publication number Publication date
ES2949519T3 (es) 2023-09-29
ES2735145B2 (es) 2020-06-29
AU2019286812B2 (en) 2024-07-04
AU2019286812A1 (en) 2021-01-21
WO2019238996A1 (es) 2019-12-19
ES2735145A1 (es) 2019-12-16
EP3808899A1 (en) 2021-04-21
PT3808899T (pt) 2023-06-22

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