EP1061204B1 - Procédé et dispositif pour tendre un câble multi-torons entre deux ancrages - Google Patents

Procédé et dispositif pour tendre un câble multi-torons entre deux ancrages Download PDF

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Publication number
EP1061204B1
EP1061204B1 EP00401635A EP00401635A EP1061204B1 EP 1061204 B1 EP1061204 B1 EP 1061204B1 EP 00401635 A EP00401635 A EP 00401635A EP 00401635 A EP00401635 A EP 00401635A EP 1061204 B1 EP1061204 B1 EP 1061204B1
Authority
EP
European Patent Office
Prior art keywords
strand
extremity
displacement
cable
tensioning
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.)
Expired - Lifetime
Application number
EP00401635A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1061204A1 (fr
Inventor
Cyrille Fargier
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.)
GTM Construction SAS
Vinci Construction Grands Projets SAS
Original Assignee
GTM Construction SAS
Vinci Construction Grands Projets SAS
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Filing date
Publication date
Application filed by GTM Construction SAS, Vinci Construction Grands Projets SAS filed Critical GTM Construction SAS
Publication of EP1061204A1 publication Critical patent/EP1061204A1/fr
Application granted granted Critical
Publication of EP1061204B1 publication Critical patent/EP1061204B1/fr
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • 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
    • 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
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G21/121—Construction of stressing jacks
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G2021/128—Prestressing each strand of a cable one by one to the same tension

Definitions

  • the present invention relates to a method for tensioning a cable formed of a beam of several strands held parallel to each other between two anchors, of the type consisting in anchoring the strands at one of their ends and straining individually and successively the different cable strands using a traction device.
  • the invention relates to also a device allowing the implementation of the method indicated above.
  • the method and the device according to the invention can be used in particular in the field of construction of cable-stayed bridges, suspension bridges or other large structures, such as sports stadiums, in which shrouds or hangers made of multi-strand cables are used to support or stabilize elements of the structure of the structure, such as a bridge deck, roofing elements or pylons.
  • the technique of individually and successively the different strands of a multi-strand cable is advantageous, for compared to the technique of simultaneously tensioning all the strands of the cable multi-strand, to the extent that the first technique allows the use of a device traction, usually a jack or hydraulic pulling winch, which is a lot smaller, much lighter and significantly less powerful than the one that would necessary to tension all the strands of the cable simultaneously (see patent FR 2,652,866).
  • a first cause is that the two anchors at the ends of the strands move towards each other at as the strands are stretched and / or the number of strands stretched increase, this rimpedement of the anchorages being itself due to the flexibility of the structural elements (bridge deck, pylons, etc.) to which the ends of the cable are anchored.
  • Another cause of the voltage change lies in the fact every time a cable strand is energized, it takes over part of the load applied to the strands previously stretched, so that these are subject to a lower load and that their voltage decreases. For all these reasons and still others, it is difficult to determine or calculate in advance the voltage it must be given to each strand of the cable when the strands are sequentially under pressure.
  • the present invention therefore aims to provide a method and a device for sequentially stranding the strands of a multi-strand cable so as to obtain, the end of the tensioning process, the same voltage value for all cable strands.
  • the anchorage A1 is for example a high anchorage located in the head portion of a tower of a cable-stayed bridge, while the anchor A2 is for example a low anchor located on the deck of the cable-stayed bridge.
  • the strand t k-1 has already been stretched and anchored at its two ends respectively in the anchor heads TA1 and TA2, while the strand t k is anchored only at one end, in the anchor head TA1, and a traction cylinder or hydraulic winch 1 is installed on the other end of the strand t k and bears against the anchor head TA2 in order to stretch this strand.
  • a displacement sensor 2 or other similar measuring device is associated with one traction cylinder to measure its stroke when it is actuated, or, what amounts to the same, to measure the end of the strand displacement value t k which is pulled by the traction cylinder 1.
  • FIGS. 1 and 2 also show an elongated reference element t ref , which is associated with the cable in such a way that it is collinear with it, one end of the elongated reference element being attached to a fixed point, while its other end is free to move in the longitudinal direction of the cable.
  • This elongated reference element t ref may advantageously consist of one of the strands of the cable.
  • one of the ends of the reference strand t ref may be anchored for example in the anchor head TA1, while its other end is free to move in one of the holes of the other head. anchoring TA2.
  • a second displacement sensor 3 or other similar measuring device is associated with the free end of the reference wire t ref in order to measure the displacement of this end, that is to say the amount from which this end "goes out” of the anchor head TA2 each time a cable strand is tensioned using the traction cylinder 1.
  • FIGS. 1 and 2 there is further shown a carrier member t p which serves to support the cable at least at the beginning of the series of tensioning operations of the strands of the cable, preferably during the entire series of operations of setting in tension.
  • This carrier element t p can also be advantageously constituted by one of the strands of the cable.
  • the carrier strand t p is installed first between the anchors A1 and A2 and its ends are anchored to the two anchor heads TA1 and TA2.
  • each strand is represented as being anchored in separate anchor heads TA1 and TA2 of those of the other cable strands, such a representation was simply adopted for the convenience of the drawing, it being understood that the anchor heads TA1 are in made up of a single anchor head with a number of holes at less equal to the number of cable strands.
  • the various anchor heads TA2 shown in Figures 1 and 2 are in fact constituted by a single head anchoring device having a number of holes at least equal to the number of strands of the cable.
  • the free end of the reference strand t ref is released from the anchoring head TA 2 by an amount d k .
  • the elongation of the strand t k-1 is now equal to [ ⁇ L - (d k - d k-1 )].
  • the strand t k is pulled until its end pulled by the traction cylinder 1 has moved by a quantity S k (measured by the displacement sensor 2) which is equal to ⁇ L 1 - (d k-1 - d 1 ), where ⁇ L 1 is the elongation of the cable which was stretched first, measured after this first setting. voltage, and d 1 is the quantity of which the free end of the reference wire t ref has emerged from the anchor head TA2 after the first strand has been tensioned.
  • the curvilinear length of each cable strand measured between the two anchors A1 and A2, the same for all strands of the cable.
  • This can be achieved when all cable strands are arranged in a common sheath, preferably in a sheath in which there is a multi-channel guide adapted to hold the strands of the cable parallel to each other.
  • a sheath is for example described in the application patent FR-99.02799 filed March 5, 1999 in the names of the same applicants
  • the sheath has been schematically shown in phantom in FIG. is designated by the reference number 4.
  • the temperature of the different strands is the same in the cable. This can again be obtained with a satisfactory approximation using the aforementioned sheath.
  • this strand is threaded through one of the holes of the anchor head TA2 and into the sheath 4 until its end of the head reaches a corresponding hole of the anchor head TA1 where this head end is anchored in a conventional manner, while the rear end of the reference strand t ref is left free to move in the corresponding hole of the head anchor TA2.
  • the displacement sensor 3 is then installed at the free rear end of the reference wire t ref in order to measure its movements relative to the anchor head TA2.
  • the strand t 1 after having accurately measured the length of the strand t 1 , it can also proceed to its tensioning by indicating a length of strand to be obtained between the anchor heads TA1 and TA2, this length being able to be example identified by appropriate marks made beforehand on the strand t 1 .
  • the strand t 2 is threaded into a hole of the anchor head TA2 and in the sheath 4 and its leading end is anchored in known manner in the anchor head TA1.
  • the traction cylinder 1 and the measuring sensor 2, properly reset, are removed from the cable t 1 and installed at the rear end 8 of the strand t 2 as shown in Figure 3c.
  • all the strands t ref , t 1 and t 2 have a curvilinear length equal to L 1 .
  • the strand t 3 is threaded into a hole of the anchor head TA 2 and in the sheath 4 and its leading end is anchored so conventional in a corresponding hole of the anchor head TA1. Then, the traction cylinder 1 and the displacement sensor 2, properly reset, are removed from the cable t 2 and installed at the rear end 11 of the strand t 3 against the anchor head TA 2 as shown in FIG. 3e . At this moment, all the strands t ref , t 1 , t 2 and t 3 have the same curvilinear length L 2 .
  • the tensioning of the cable is continued for each of the following strands of the cable in the same manner as that described above with respect to the strands t 2 to t k , and that up to the strand t n .
  • the carrier strand t p is stretched in penultimate (strand t n-1 ) and the reference strand t ref is stretched last (strand t n ).
  • a tensioning cycle is restarted by successively retaining the strands t 1 to t n-1 in order to equalize their elongations, and therefore their final tension.
  • This second tensioning cycle can be carried out relatively quickly since the strands no longer have to be threaded into the cable sheath and the amounts of displacement S 1 to be made to tighten the strands will generally be relatively small.
  • the last strand t n which has been used as the reference strand can be stretched and anchored as indicated above.
  • the predefined compensation value e can be determined for example by calculations and / or measurements made beforehand during tests on a material anchorage and with strands identical to those used for the implementation of the process according to the invention. Usually, the value of e is of the order of a few millimeters.
  • the output of the displacement sensor 2 is connected on the one hand to a first memory 13 and, on the other hand, to the negative input of a comparator 14.
  • the memory 13 is arranged to store the value S 1 .
  • the memory 13 stores the value S 1 , it can nevertheless be arranged to store even in the first case all the values of S k measured by the sensor This may be of interest for purposes of subsequent checks or statistics.
  • the memory 13 is connected to a computer 15 and sends to it either the value S 1 if the method according to the invention is implemented using the formula (23) or (25), or the value S k-1 if the process according to the invention is carried out using formula (24) or (26).
  • a predefined compensation value e is also sent to the computer 15.
  • This compensation value e can be for example introduced by a user using a keyboard and stored in a memory of calculator 15
  • the latter calculates a set value S kc by using the formula (23), (24), (25) or (26) which has been chosen for the implementation of the process according to the invention.
  • the setpoint value S kc calculated by the computer 15 is sent to the positive input of the comparator 14 which compares this setpoint value with the actual value s kr measured at the same time by the displacement sensor 2.
  • the output of the comparator 14 is connected to the input of a regulator 17, the output of which controls a motor pump unit 18 hydraulically connected to the traction cylinder 1 for supplying hydraulic fluid under pressure.
  • the regulator 17 is a regulator of the PID (Proportional Integral Derivative) type in order to avoid any oscillation or other instability in the control of the traction cylinder 1.
  • the two memories 13 and 16 and the calculator 15 can be part of a PLC or a microcomputer.
  • the two memories 13 and 16 can then be constituted by memory areas of the RAM of the programmable logic controller or the microcomputer, and the computer 15 can be constituted by the microprocessor of the programmable logic controller or the microcomputer.
  • the function of the comparator 14 could also be fulfilled by the microprocessor, suitably programmed, PLC or microcomputer.
  • one of the cable strands as carrier strand for putting the cable sheath 4 in place between the anchors A1 and A2 before tensioning the strands thereof and to support said sheath during the tensioning operations of the strands of the cable, this is not absolutely essential. Indeed, the sheath 4 of the cable could be put in place and supported by other known techniques.
  • each cable strand t k is threaded into the sheath 4 after the previous strand t k-1 of the cable has been tensioned and anchored

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Flexible Shafts (AREA)
  • Ropes Or Cables (AREA)
EP00401635A 1999-06-14 2000-06-09 Procédé et dispositif pour tendre un câble multi-torons entre deux ancrages Expired - Lifetime EP1061204B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9907477 1999-06-14
FR9907477A FR2794783B1 (fr) 1999-06-14 1999-06-14 Procede et dispositif pour tendre un cable multi-torons entre deux ancrages

Publications (2)

Publication Number Publication Date
EP1061204A1 EP1061204A1 (fr) 2000-12-20
EP1061204B1 true EP1061204B1 (fr) 2005-07-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00401635A Expired - Lifetime EP1061204B1 (fr) 1999-06-14 2000-06-09 Procédé et dispositif pour tendre un câble multi-torons entre deux ancrages

Country Status (8)

Country Link
EP (1) EP1061204B1 (es)
JP (1) JP4427168B2 (es)
KR (1) KR100607116B1 (es)
AT (1) ATE299216T1 (es)
DE (1) DE60021147D1 (es)
ES (1) ES2245296T3 (es)
FR (1) FR2794783B1 (es)
PT (1) PT1061204E (es)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2813907B1 (fr) * 2000-09-08 2004-02-13 Michel Marchetti Procede de mise en tension de haubans a torons multiples
FR2883376B1 (fr) 2005-03-17 2007-06-15 Fressinet Internat Stup Procede de detection de rupture au sein d'une structure et systeme pour la mise en oeuvre du procede
US20070271762A1 (en) * 2006-05-25 2007-11-29 Actuant Corporation System and method for automatically stressing mono-strand tendons
DE102008032881B3 (de) * 2008-07-14 2009-11-12 Dywidag-Systems International Gmbh Vorrichtung und Verfahren zum Steuern einer Spannpresse beim Spannen eines Spannglieds
JP5365834B2 (ja) * 2008-09-18 2013-12-11 清水建設株式会社 ケーブルへの張力導入方法
ITPC20090001A1 (it) * 2009-01-08 2010-07-09 Stefano Zambelli Dispositivo modulare per la programmazione, controllo e registrazione dei valori di tesatura di trecce e trefoli pretesi e postesi negli stabilimenti e cantieri fissi e mobili di prefabbricazione di manufatti in calcestruzzo
KR101299963B1 (ko) * 2011-11-11 2013-08-26 대림산업 주식회사 콤팩트 멀티-스트랜드 케이블의 가설방법
KR101753702B1 (ko) 2015-06-05 2017-07-19 주식회사 포스코건설 교량의 ms 케이블 균등긴장 제어 방법 및 장치
DE102017206257A1 (de) * 2017-04-11 2018-10-11 Dywidag-Systems International Gmbh Enteisungs- und Vereisungsvorbeugungsvorrichtung für das Mantelrohr eines Spannglieds, Spannglied mit einer derartigen Vorrichtung und Bauwerk mit wenigstens einem derartigen Spannglied
KR20200119514A (ko) * 2019-04-10 2020-10-20 에프이엔 주식회사 케이블 자동 인장 시스템 및 자동 인장 방법

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR703079A (fr) * 1929-10-23 1931-04-23 Felten & Guilleaume Carlswerk Câble métallique avec dispositif pour en mesurer l'allongement
JPH02240374A (ja) * 1989-03-10 1990-09-25 Joban Kosan Kk Ｐｃ綱線の同時緊張管理装置
FR2652866B1 (fr) 1989-10-05 1994-01-07 Freyssinet International Perfectionnements aux procedes et dispositifs pour mettre sous tension des cables a brins multiples.
DE19536701C2 (de) * 1995-09-30 1999-07-15 Dyckerhoff & Widmann Ag Verfahren zum Spannen eines Zugglieds aus einer Mehrzahl von Einzelelementen

Also Published As

Publication number Publication date
KR20010020985A (ko) 2001-03-15
ES2245296T3 (es) 2006-01-01
FR2794783B1 (fr) 2001-08-03
JP2001032213A (ja) 2001-02-06
DE60021147D1 (de) 2005-08-11
FR2794783A1 (fr) 2000-12-15
JP4427168B2 (ja) 2010-03-03
KR100607116B1 (ko) 2006-08-01
ATE299216T1 (de) 2005-07-15
EP1061204A1 (fr) 2000-12-20
PT1061204E (pt) 2005-11-30

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