EP0227546B1 - Perfectionnements aux dispositifs pour exercer une traction sur un tirant avant ancrage - Google Patents

Perfectionnements aux dispositifs pour exercer une traction sur un tirant avant ancrage Download PDF

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Publication number
EP0227546B1
EP0227546B1 EP86402826A EP86402826A EP0227546B1 EP 0227546 B1 EP0227546 B1 EP 0227546B1 EP 86402826 A EP86402826 A EP 86402826A EP 86402826 A EP86402826 A EP 86402826A EP 0227546 B1 EP0227546 B1 EP 0227546B1
Authority
EP
European Patent Office
Prior art keywords
tie
traction
jack
grip
bands
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
EP86402826A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0227546A3 (en
EP0227546A2 (fr
Inventor
Pierre Jartoux
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
Priority to AT86402826T priority Critical patent/ATE62970T1/de
Publication of EP0227546A2 publication Critical patent/EP0227546A2/fr
Publication of EP0227546A3 publication Critical patent/EP0227546A3/fr
Application granted granted Critical
Publication of EP0227546B1 publication Critical patent/EP0227546B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 the tensioning of tie rods, a first end of which has been previously anchored on a first anchoring span of a rigid structure.
  • Such structures are for example made of concrete, in which case the tie rods ensure the prestressing of this concrete by post-tensioning.
  • the structures in question could also be of any other type, and in particular suspension bridges, the tie rods of which would then constitute the shrouds.
  • the invention relates more particularly, among the tensioning devices of the kind in question, those for which the grip of the end of tensioning rod is ensured by provisional tightening of a jaw whose jaws overlap this end, said tightening being generated using a cylinder supplied with a pressurized fluid.
  • each jaw is applied to the tie rod by means of an externally threaded and split core radially surrounding this tie rod and cooperating with an internally threaded sleeve forming part of the fixed or mobile element of the jack.
  • This core is mounted so as to move axially with the tie rod in short strokes to cause it to be tightened and loosened radially.
  • the object of the invention is, above all, to remedy this drawback.
  • the traction devices according to the invention are essentially characterized in that the provisional clamping pressure of each jaw is applied to the tie rod by jaws which can be moved exclusively in transverse directions relative to the jack element on which this jaw is mounted.
  • 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.
  • Figure 1 of these drawings shows in schematic longitudinal section a tensioning device established according to the invention in its rest state.
  • Figures 2, 3 and 4 show the same device in schematic longitudinal half-section in respectively three stages of its operation.
  • the tie rod 1 to be tensioned is constituted by a bundle of parallel flat ribbons 2 each formed for example by a steel strip or by an element made of composite material (material comprising a matrix of plastic material reinforced by continuous parallel fibers), as taught by the patent cited above.
  • the tensioning device under consideration comprises a platform 6 hollowed out at its center by an opening 7 itself traversed by the tie rod 1, said platform being supported at a certain distance above the block 3 by a base 8.
  • a traction cylinder V1 comprises a cylinder 9 with a vertical axis secured to the platform 6 and a piston 10, the rod 11 of which opens vertically above this cylinder 9.
  • the latter is supplied with compressed fluid by intake and exhaust pipes or vice versa 12,13.
  • the rod 11 is extended at its top by a rigid horizontal plate 14 itself pierced by a central opening 15 crossed by the tie rod 1.
  • the platform 6 and the plate 14 each carry a jaw 20.30 suitable for gripping the tie rod 1 at the corresponding level.
  • Each clamping cylinder V2, V3 is supplied with pressurized fluid by intake and exhaust pipes or vice versa 27,37; 28.38.
  • the mutual contact surfaces of the wafers and tapes, their coefficient of mutual friction (preferably increased by roughening the surfaces of the wafers and possibly hardening them by heat treatment) and the force of the horizontal tightening of the tapes against the wafers must be sufficient to prevent any sliding of the ribbons relative to the plates when a longitudinal tension is exerted on these ribbons in the manner which will be specified below.
  • this high jaw 30 is raised by activating the traction cylinder V1, which causes its rod 11 to rise upwards, and this until its maximum extension, as shown in FIG. 2, which gives the tensioner a first tension T1.
  • this upper jaw 30 has again returned to its low position, it is tightened again so that it in turn takes over from the lower jaw 20 for maintaining the tension T1 in the tie 1: this lower jaw 20 can then be loosened and the cycle described above can be completely repeated.
  • the control of these successive cycles is advantageously made automatic by making the tool comprise an appropriate pressurized fluid distributor and a device suitable for measuring the tension applied to the tie rod 1 by the traction cylinder during each active operating phase of this jack corresponding to the progressive exit of its rod 11.
  • the tensioned tie rod 1 is anchored on block 3 in any desirable manner.
  • the anchoring is then carried out by activating the cylinder V4 in the direction which irreversibly biases the frame 43 downwards.
  • This anchoring could be achieved in any other desirable way, for example by tightening the tie rod 1 between two rigid bars urged towards each other using high strength bolt-nut systems, all of these bars and of these systems framing the stack of ribbons 2 and interlacing plates 41 to be tightened.
  • the anchoring thus described takes over from the two clamping jaws 20 and 30 for maintaining the tension T in the tie rod 1 so that these two jaws can be loosened (FIG. 4), then release the set of tensioning tools, which can be used to tension another tie rod.
  • the invention is not limited in no way to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all variants thereof, in particular those in which the tie rod is not in the form of parallel ribbons, but in that of cylindrical cables or strands, the clamping jaws then comprising radially split jaws of revolution surrounding said cables or strands, said jaws being hollowed out by a cylindrical bore, externally bounded by a frustoconical surface, and adapted to interact with complementary frustoconical housings hollowed out in axially movable rings.

Landscapes

  • Architecture (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Clamps And Clips (AREA)
  • Vehicle Body Suspensions (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Jib Cranes (AREA)
  • Ropes Or Cables (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Warping, Beaming, Or Leasing (AREA)
  • Knitting Machines (AREA)
EP86402826A 1985-12-16 1986-12-16 Perfectionnements aux dispositifs pour exercer une traction sur un tirant avant ancrage Expired - Lifetime EP0227546B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86402826T ATE62970T1 (de) 1985-12-16 1986-12-16 Vorrichtungen zum spannen von zugelementen vor der verankerung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8518596A FR2591643B1 (fr) 1985-12-16 1985-12-16 Perfectionnements aux dispositifs pour exercer une traction sur un tirant avant ancrage
FR8518596 1985-12-16

Publications (3)

Publication Number Publication Date
EP0227546A2 EP0227546A2 (fr) 1987-07-01
EP0227546A3 EP0227546A3 (en) 1988-07-20
EP0227546B1 true EP0227546B1 (fr) 1991-04-24

Family

ID=9325828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402826A Expired - Lifetime EP0227546B1 (fr) 1985-12-16 1986-12-16 Perfectionnements aux dispositifs pour exercer une traction sur un tirant avant ancrage

Country Status (6)

Country Link
EP (1) EP0227546B1 (enrdf_load_stackoverflow)
JP (1) JPS62156477A (enrdf_load_stackoverflow)
AT (1) ATE62970T1 (enrdf_load_stackoverflow)
DE (1) DE3678915D1 (enrdf_load_stackoverflow)
ES (1) ES2021604B3 (enrdf_load_stackoverflow)
FR (1) FR2591643B1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3925368A1 (de) * 1989-08-01 1991-02-14 Holzmann Philipp Ag Verfahren und einrichtung zum einfaedeln von spannstaehlen fuer buendelspannglieder in einsinnig gekruemmte spannkanaele
RU2404336C1 (ru) * 2009-04-13 2010-11-20 Сергей Львович Ситников Устройство для напряжения пучков прядевой арматуры в предварительно напряженных железобетонных конструкциях
CN116119231B (zh) * 2022-12-30 2024-01-30 无锡中鼎集成技术有限公司 仓储用轻型堆垛机

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763464A (en) * 1952-07-26 1956-09-18 Leonhardt Fritz Apparatus for anchorage of concrete reinforcements
DE1082394B (de) * 1952-08-04 1960-05-25 Fritz Leonhardt Dr Ing Vorrichtung und Verfahren zum Verankern von Staeben, insbesondere fuer Spannbeton
US3090598A (en) * 1960-02-09 1963-05-21 Max Paul & Sohne Maschinenfabr Hydraulic jack for the prestressing of concrete reinforcements
FR2063477A5 (enrdf_load_stackoverflow) * 1969-10-17 1971-07-09 Marseille Grands Travaux
US4095335A (en) * 1977-01-12 1978-06-20 Trouvay & Cauvin Automatic tube puller
ATE47612T1 (de) * 1980-08-13 1989-11-15 Restra Patentverwertung Gmbh Vorrichtung zur endverankerung mindestens eines als spannglied im spannbetonbau eingesetzten stabes aus faser-verbundwerkstoff.
JPS6058349B2 (ja) * 1981-08-14 1985-12-19 建設基礎エンジニアリング株式会社 Ｐｃ鋼材の緊張工法およびその装置

Also Published As

Publication number Publication date
ES2021604B3 (es) 1991-11-16
DE3678915D1 (de) 1991-05-29
FR2591643B1 (fr) 1990-11-02
JPH0481028B2 (enrdf_load_stackoverflow) 1992-12-22
EP0227546A3 (en) 1988-07-20
JPS62156477A (ja) 1987-07-11
ATE62970T1 (de) 1991-05-15
FR2591643A1 (fr) 1987-06-19
EP0227546A2 (fr) 1987-07-01

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