EP0544573A1 - Dispositifs pour supprimer le mou des torons composant un câble de précontrainte - Google Patents

Dispositifs pour supprimer le mou des torons composant un câble de précontrainte Download PDF

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Publication number
EP0544573A1
EP0544573A1 EP92403138A EP92403138A EP0544573A1 EP 0544573 A1 EP0544573 A1 EP 0544573A1 EP 92403138 A EP92403138 A EP 92403138A EP 92403138 A EP92403138 A EP 92403138A EP 0544573 A1 EP0544573 A1 EP 0544573A1
Authority
EP
European Patent Office
Prior art keywords
piston
strands
strand
jaw
ring
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.)
Withdrawn
Application number
EP92403138A
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German (de)
English (en)
French (fr)
Inventor
Pierre Jartoux
Daniel Thomarat
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.)
Freyssinet International STUP SA
Original Assignee
Freyssinet International STUP SA
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 Freyssinet International STUP SA filed Critical Freyssinet International STUP SA
Publication of EP0544573A1 publication Critical patent/EP0544573A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
    • 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
    • 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

Definitions

  • the invention relates to devices for tensioning in their sheaths the prestressing cables made up of several strands, each strand being itself advantageously constituted by a bundle of metal strands comprising a central core and six strands twisted around this core.
  • one of the ends of this cable is anchored to an appropriate block, that is to say one end of each of the strands that compose it, then it is hung on the head of a large jack the other end of said cable, that is to say the end, of each strand, opposite to that anchored on the block.
  • the strands in question are arranged in the sheath in a disordered manner and the paths taken by them between the two ends of the sheath do not have identical lengths.
  • the degrees of "slack" corresponding to the different strands differ from one another.
  • the strand takes its position corresponding to the shortest possible path for it, coming in contact in particular with the portions of smaller diameter of the sheath in its curves and, during this phase, even if the displacement total of the stretched end of the strand is relatively large, the tension applied to this strand is extremely low.
  • the second phase of traction is reached for certain strands well before the first phase is completed for others: the first strands mentioned then work much more than the others, which has many drawbacks, in particular with regard to the risks of overvoltage of said "first strands" and the reduction of the overall traction performance.
  • the present invention aims, above all, to remedy these drawbacks by making it possible to catch the "soft" of the different strands, even if they differ from one another, as is the general case, even before the global and simultaneous application of the prestressing traction on these strands.
  • the devices of the type in question intended to catch the slack of the n strands making up a prestressing cable, n being an integer greater than 1 and generally between 10 and 100, also include, in a manner known per se , a pierced anchor block by n at least partly frustoconical bores respectively equipped with n split main anchoring jaws, internally cylindrical and externally frustoconical crossed respectively by the tender ends of the n strands, and they are essentially characterized according to the invention in that they comprise in addition a multiple cylinder forming n double-acting sub-cylinders and comprising: a barrel cylinder applied axially against the anchoring block and constituting n cylinders with parallel axes coinciding with those of the above bores; n tubular pistons crossed with clearance by the strands and mounted so as to be able to slide axially in the cylinders, reserving between them and these cylinders two sealed chambers respectively disposed at the two axial ends
  • the invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.
  • Figures 1 and 2 of these drawings are diagrams showing, in a concrete structure, a sinuous sheath intended to contain a prestressing cable composed of several strands, cable to which the invention applies with advantage.
  • Figure 3 shows in axial section a slack adjuster of such a cable, established in accordance with the invention.
  • FIG. 4 very schematically shows another device for taking up slack in a cable of the above type, also according to the invention.
  • Figure 5 shows in more detail on a larger scale and in axial section a portion of the latter device.
  • FIG. 6 is an enlarged cross section along VI, FIG. 7, of a portion of FIG. 5.
  • Figure 7 is an axial section along VII-VII, Figure 6.
  • Figure 1 shows a concrete structure 1 in which is embedded a sheath 2 with a sinuous path, that is to say comprising several curves or elbows oriented in opposite directions, sheath intended to contain a prestressing cable made up of a plurality strands 3.
  • the number n of these strands is greater than 1 and generally between 10 and 100.
  • Each strand is generally made up of seven metallic wires, one of which, constituting the central core, is joined contiguously by the other six, wound in helix or "twisted" around it.
  • each strand in the sheath is pushed back from one end of the sheath, as symbolized by the arrows P in Figure 1.
  • the different strands do not all occupy positions in the sheath corresponding to their shortest path between the two ends of this sheath.
  • the degrees of "slack" corresponding to the different strands that is to say the length of the axial displacements which it is necessary to subject to one of their ends relative to the other for the put them in place before you start to really stretch them, are very different.
  • the two embodiments described below with reference respectively to Figure 3 and Figures 4 to 7 differ from each other in that, in the first case, the prior catching of the slack is carried out on the ends strands independently of the prestressing tensioning, the device assigned to the first stage being intended to be removed to make room for the jack intended for the final stage whereas, in the second case, the devices assigned to the two stages are mounted simultaneously on the head of the cable to be energized, their successive actuations occurring without intermediate disassembly.
  • This block is traversed right through by n bores 5 cooperating with anchoring jaws 6.
  • Each jaw 6, split is composed of two or three keys and has a frustoconical outer face housed contiguously in a complementary portion of a bore 5 and a cylindrical inner face applied contiguously around the associated strand 3 to be anchored.
  • the device for prior tensioning of the strands 3 comprises a support ring 7 covering the block 4 and bearing on it and a multiple jack 8 bearing on the ring 7.
  • the ring 7 internally carries two adjoining transverse plates 9 and 10 both crossed with play by the strands 3, the first 9 being rigid and the second 10, made of an elastomeric material.
  • This last plate 10 bears axially against the open ends, of the jaws 6, projecting outside the block 4.
  • the multiple cylinder 8 As for the multiple cylinder 8, it forms a plurality of n double-acting sub-cylinders.
  • This jack 8 comprises a barrel cylinder 11 which is hollowed out by n cylindrical housings 12 whose parallel axes coincide with those of the bores 5.
  • Each cylindrical housing 12 contains a tubular piston 13 crossed with clearance by a strand 3 and mounted so as to be able to slide axially in the cylindrical housing considered while reserving between these two elements two sealed chambers A and B respectively disposed at the two axial ends of the 'together: the seal between these two elements is advantageously ensured by O-rings 14 and 15.
  • the different chambers A which are the chambers furthest from the anchor block 4, all communicate with each other via a transverse chamber C.
  • Means are also provided for connecting at will, respectively through pipes 16 or 17, all of the chambers A or all of the chambers B with a source 18 of liquid under pressure.
  • each piston 13 and its cylindrical housing 12 is ensured either by linings, or by grooves generating progressive pressure losses.
  • Each piston 13 carries, at its end furthest from the anchoring block 4, which projects outside the barrel 11, a device 19 for tightening and loosening automatic of the corresponding strand 3.
  • This device 19 preferably comprises a ring 20 integral with the piston, comprising a frustoconical inner surface converging towards the anchoring block 4, an auxiliary split jaw 21, cylindrical internally and frustoconical externally, housed freely inside the ring 20, and a helical compression spring 22 tending to push the auxiliary jaw 21 axially into the ring 20.
  • the ring 7 and the multiple jack 8 are initially put in place on the block 4 by threading each of the different strands 3 successively into the main jaw 6 which is intended for it, then in the holes in the plates 10 and 9, then in one of the tubular pistons 13 and finally in the auxiliary jaw 20 carried by this piston 13.
  • Chamber D is then connected to the source of pressurized liquid 18, which urges all of the pistons 13 to the left, and therefore the portions of strands 3 which are joined to these pistons by clamping the jaws 20.
  • the pressure of the liquid is such that the tension thus exerted on each strand 3 corresponds substantially to one tenth of the final tension to which it is desired to subject them so that they exercise the prestressing function for which they are intended.
  • this prestressing tension can be of the order of 20 tonnes, so that the prior tension applied by the multiple jack 8 on the different strands 3 in order to catch up with their respective "soft" is then of the order of 2 tonnes.
  • the multiple jack 8 is released in order to replace it with the large jack intended for the simultaneous subsequent overall tensioning of all the strands 3.
  • the automatic clamping devices 19 are of course neutralized, for example by axially disengaging the auxiliary jaws 21 from their associated rings 20 using appropriate pins.
  • Chamber C rather than chamber D, is then made to communicate with the source of pressurized liquid 18, which pushes all of the pistons back to their starting positions located on the far right in FIG. 3: during this return, the strands 3 remain stationary due to the fact that the blocking is carried out in line with the main jaws 6 whereas, on the contrary, it is eliminated in line with the auxiliary jaws 20, as explained above.
  • this ring is here traversed by smooth sliding by sleeves 38 having a cylindrical outer surface of revolution and themselves crossed with clearance by the strands 3.
  • each sleeve is adapted to bear axially against the open end of a jaw 6, leaving the block 4 and its other axial end covers the corresponding end of the contiguous tubular piston 13.
  • each sleeve has a bearing 39, preferably constituted by an internal annular shoulder, against which abuts axially at its end of travel to the right, the end portion of the associated tubular piston 13.
  • auxiliary anchoring device associated with each piston 13, it is further made to understand, as before, an inner ring frustoconical 20 secured to the piston, a split annular jaw 21 mounted idly in this housing and a spring 22 biasing the jaw axially in its housing, that is to say to the right in the drawing.
  • a mechanism is also provided for enabling this jaw 21 to be positively and automatically neutralized from the end of the work of the multiple actuator, or more precisely from the moment when, the corresponding piston having reached the end of its stroke towards the right, the multiple cylinder is deactivated by draining.
  • the end face of the jaw 21, axially opposite to its range 24, is delimited by a frustoconical surface 30 converging towards the block 4 and suitable for cooperating with a complementary frustoconical surface 31 delimiting axially a flange 32 which itself extends towards outside an axial end of a thin cylindrical jacket 33 inserted contiguously inside the spring 22.
  • the strand 3 begins to move to the right, but it is almost immediately stopped by the anchoring of the main jaw 6 associated with this strand in its housing 5.
  • this jaw 6 remains slightly tightened permanently around said strand due to the presence of an elastic ring 35 (FIG. 5) in an annular groove surrounding this jaw: it is therefore driven axially by the strand to the right, and pushed axially into its housing 5 by a sufficient degree to block the strand.
  • the piston 13 By moving to the right, the piston 13 carries with it the ring 20 which is integral therewith.
  • the jaw 21 then loosens.
  • Said jaw 21 is then axially trapped between the two parts 25 and 32 under the combined effect of the opposing thrusts of the two springs 22 and 26: it is then loosened or "neutralized” positively.
  • the spring 26 is provided in such a way that its turns become contiguous practically at the end of the stroke of the piston 13 to the right, for which the jaw 6 occupies its position of maximum insertion into its housing 5, position shown in FIG. 7 and for the bottom piston of figure 5.
  • the constitution of the spacer 25 by two separate parts allows both to have a continuous annular bearing 28 to push the discontinuous crown of the bearing surfaces 24 and to allow a radial crossing of the piston assembly 13-ring 20 at the bars 291 of the cage, crossing made necessary by the fact that the bearing 28 is inside this assembly while the flange 292 is outside.
  • the individual and equalized tensioning of the different strands 3, making it possible to catch the "soft" of these strands, is carried out as with the first embodiment, in one or more passes, by means of tension strokes which can vary a lot. 'one strand to another.
  • This pre-tensioning is completed when the application of hydraulic pressure in all the chambers B of the cylinders 12 has the effect of placing the corresponding pistons 13 in one of their intermediate "floating" positions as defined above.
  • All the chambers B are then emptied and the hydraulic pressure is applied in all the chambers A so as to return all the pistons to their extreme right positions, which automatically ensures the locking of all the strands in their final positions, by tightening forceful of the main 6 jaws around them.
  • the multiple cylinder 8 is put out of circuit by emptying its chambers A and B so that the pistons 13 become floating.
  • the main jaw 6 emerges axially from its housing 5 due to its friction against the strand 3, friction reinforced by the presence of the assembly rod 35.
  • This clearance moves back (to the left) the corresponding sheath 38, with an amplitude limited by axial abutment of this sheath against the frame 11 of the multiple jack 8.
  • the ring 20 can again, during the return R considered, cooperate with the jaw 21 to the point of tightening the latter around the strand 3.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Ropes Or Cables (AREA)
  • Bridges Or Land Bridges (AREA)
  • Actuator (AREA)
EP92403138A 1991-11-26 1992-11-20 Dispositifs pour supprimer le mou des torons composant un câble de précontrainte Withdrawn EP0544573A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9114575A FR2684122B1 (fr) 1991-11-26 1991-11-26 Dispositifs pour supprimer le mou des torons composant un cable de precontrainte.
FR9114575 1991-11-26

Publications (1)

Publication Number Publication Date
EP0544573A1 true EP0544573A1 (fr) 1993-06-02

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Application Number Title Priority Date Filing Date
EP92403138A Withdrawn EP0544573A1 (fr) 1991-11-26 1992-11-20 Dispositifs pour supprimer le mou des torons composant un câble de précontrainte

Country Status (3)

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EP (1) EP0544573A1 (ja)
JP (1) JP3437203B2 (ja)
FR (1) FR2684122B1 (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076287A1 (en) 2009-12-24 2011-06-30 Vsl International Ag Method and system for equally tensioning multiple strands
CN106315451A (zh) * 2016-10-18 2017-01-11 柳州黔桥工程材料有限公司 钢绞线群锚整体式自动同步控制系统
CN106315450A (zh) * 2016-10-18 2017-01-11 柳州黔桥工程材料有限公司 钢绞线群锚拉索整体式自动同步预紧装置
CN106429943A (zh) * 2016-10-18 2017-02-22 柳州黔桥工程材料有限公司 整体式多活塞单根预紧千斤顶
CN110091433A (zh) * 2019-05-23 2019-08-06 上海市政工程设计研究总院（集团）有限公司 一种多活塞穿心液压模块
CN113512950A (zh) * 2021-05-13 2021-10-19 开封强力集团锚固技术股份有限公司 一种用于调节钢绞线张紧度的液压夹持装置及其使用方法
CN113640126A (zh) * 2021-10-13 2021-11-12 中国矿业大学(北京) 岩土预应力锚索或锚杆张拉装置
CN115369770A (zh) * 2022-08-31 2022-11-22 保利长大工程有限公司 一种控速骑跨式吊索放索机
CN117486114A (zh) * 2024-01-03 2024-02-02 河南丽卡数控设备有限公司 一种多孔前卡千斤顶

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6232300B2 (ja) * 2014-01-28 2017-11-15 首都高速道路株式会社 既設ｐｃ鋼材の再定着方法
CN105863274B (zh) * 2016-06-03 2023-09-08 天津银龙预应力材料股份有限公司 一种专用于预应力材料张拉伸长的自动锁定装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1570732A (ja) * 1968-05-02 1969-06-13
DE3437108A1 (de) * 1984-10-10 1986-04-10 Dyckerhoff & Widmann AG, 8000 München Vorrichtung zur verwendung bei der montage eines zuggliedes aus stahldraehten, -litzen oder dergleichen
FR2615422A1 (fr) * 1987-05-22 1988-11-25 Bielecki Stanislas Dispositif pour mise en tension de cables de precontrainte, de haubans, d'amarres, ou pour deplacement de charges lourdes
US4805877A (en) * 1987-09-28 1989-02-21 Charles Hoekstra Tendon stressing jack and method
EP0421862A1 (fr) * 1989-10-05 1991-04-10 Freyssinet International (Stup) Perfectionnements aux procédés et dispositifs pour mettre sous tension des câbles à brins multiples
EP0323285B1 (fr) * 1987-11-25 1992-05-13 Freyssinet International (Stup) Perfectionnements aux ensembles constitués par un hauban et sa structure d'ancrage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1570732A (ja) * 1968-05-02 1969-06-13
DE3437108A1 (de) * 1984-10-10 1986-04-10 Dyckerhoff & Widmann AG, 8000 München Vorrichtung zur verwendung bei der montage eines zuggliedes aus stahldraehten, -litzen oder dergleichen
FR2615422A1 (fr) * 1987-05-22 1988-11-25 Bielecki Stanislas Dispositif pour mise en tension de cables de precontrainte, de haubans, d'amarres, ou pour deplacement de charges lourdes
US4805877A (en) * 1987-09-28 1989-02-21 Charles Hoekstra Tendon stressing jack and method
EP0323285B1 (fr) * 1987-11-25 1992-05-13 Freyssinet International (Stup) Perfectionnements aux ensembles constitués par un hauban et sa structure d'ancrage
EP0421862A1 (fr) * 1989-10-05 1991-04-10 Freyssinet International (Stup) Perfectionnements aux procédés et dispositifs pour mettre sous tension des câbles à brins multiples

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076287A1 (en) 2009-12-24 2011-06-30 Vsl International Ag Method and system for equally tensioning multiple strands
KR20120116939A (ko) * 2009-12-24 2012-10-23 파우에스엘 인터나치오날 아게 복수 개의 가닥들을 균일하게 인장시키는 방법 및 시스템
CN102782232A (zh) * 2009-12-24 2012-11-14 Vsl国际股份公司 用于相等地张紧多条绞线的方法及系统
RU2515412C2 (ru) * 2009-12-24 2014-05-10 Фсл Интернациональ Аг Способ и система для равного натяжения множества прядей
CN102782232B (zh) * 2009-12-24 2015-02-25 Vsl国际股份公司 用于相等地张紧多条绞线的方法及系统
US9103131B2 (en) 2009-12-24 2015-08-11 Vsl International Ag Method and system for equally tensioning multiple strands
KR101631889B1 (ko) 2009-12-24 2016-06-20 파우에스엘 인터나치오날 아게 복수 개의 가닥들을 균일하게 인장시키는 방법 및 시스템
CN106315450A (zh) * 2016-10-18 2017-01-11 柳州黔桥工程材料有限公司 钢绞线群锚拉索整体式自动同步预紧装置
CN106315451A (zh) * 2016-10-18 2017-01-11 柳州黔桥工程材料有限公司 钢绞线群锚整体式自动同步控制系统
CN106429943A (zh) * 2016-10-18 2017-02-22 柳州黔桥工程材料有限公司 整体式多活塞单根预紧千斤顶
CN110091433A (zh) * 2019-05-23 2019-08-06 上海市政工程设计研究总院（集团）有限公司 一种多活塞穿心液压模块
CN113512950A (zh) * 2021-05-13 2021-10-19 开封强力集团锚固技术股份有限公司 一种用于调节钢绞线张紧度的液压夹持装置及其使用方法
CN113512950B (zh) * 2021-05-13 2023-03-14 开封强力集团锚固技术股份有限公司 一种用于调节钢绞线张紧度的液压夹持装置及其使用方法
CN113640126A (zh) * 2021-10-13 2021-11-12 中国矿业大学(北京) 岩土预应力锚索或锚杆张拉装置
CN113640126B (zh) * 2021-10-13 2022-01-11 中国矿业大学(北京) 岩土预应力锚索或锚杆张拉装置
CN115369770A (zh) * 2022-08-31 2022-11-22 保利长大工程有限公司 一种控速骑跨式吊索放索机
CN117486114A (zh) * 2024-01-03 2024-02-02 河南丽卡数控设备有限公司 一种多孔前卡千斤顶
CN117486114B (zh) * 2024-01-03 2024-03-05 河南丽卡数控设备有限公司 一种多孔前卡千斤顶

Also Published As

Publication number Publication date
JP3437203B2 (ja) 2003-08-18
FR2684122B1 (fr) 1994-02-11
FR2684122A1 (fr) 1993-05-28
JPH0782681A (ja) 1995-03-28

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