EP0227546A2 - Vorrichtungen zum Spannen von Zugelementen vor der Verankerung - Google Patents
Vorrichtungen zum Spannen von Zugelementen vor der Verankerung Download PDFInfo
- Publication number
- EP0227546A2 EP0227546A2 EP86402826A EP86402826A EP0227546A2 EP 0227546 A2 EP0227546 A2 EP 0227546A2 EP 86402826 A EP86402826 A EP 86402826A EP 86402826 A EP86402826 A EP 86402826A EP 0227546 A2 EP0227546 A2 EP 0227546A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- tie rod
- jaw
- ribbons
- traction
- jaws
- 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.)
- Granted
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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.
- Each jaw is a wedge having on the one hand a face oriented parallel to the axis of the tie rod, face capable of being applied transversely against this tie rod and on the other hand an opposite oblique face suitable for cooperating by sliding with a complementary part mounted so that it can move parallel to the axis of the tie rod
- the tie rod is constituted by a bundle of parallel flat ribbons and each clamping jaw comprises a rigid plate pierced with an opening traversed by said bundle of ribbons, a plurality of rigid plates each having a central portion interposed contiguously between two successive ribbons and two portions projecting transversely beyond these ribbons and resting on the plate, two prismatic jaws arranged on either side of the wafer-ribbon assembly and each having a flat face applied against a ribbon and an opposite oblique face, the oblique faces of the two corners being oriented so as to converge in the direction away from the structure, a
- 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 of these jaws 20.30 includes: a plurality of plates 21, 31 each comprising a central portion interposed contiguously between two strips 2 and two overhanging end portions resting on the corresponding plate 6 or 14, two prismatic corners 22, 32 each having a flat face applied contiguously against a strip 2 and an opposite oblique face, the oblique faces of the two corners converging upwards, - a frame 23,33 having two sides conforming to clean corners to slide against the oblique faces of the above corners so as to exert a horizontal clamping force on the latter and on the stacks of ribbons and plates which they frame when a trapping force is applied vertically downwards on this frame, - And a clamping cylinder V2, V3 capable of generating such a force and comprising a cylinder 24, 34 of vertical axis secured to the corresponding plate 6 or 14 and a piston 25, 35 whose rod 26, 36 is secured to the frame concerned 23.33.
- 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.
- a jaw 40 similar to those described above, that is to say comprising: intermediate plates 41 each having a central portion interposed contiguously between the ribbons 2 and two transversely overhanging end portions resting on the block 3, - two prismatic corners 42, a frame 43 capable of interacting with the corners 42, - And a cylinder V4 itself comprising a cylinder 44 integral with the encroachment 8 and a piston 45 extended downwards by a rod 46 adapted to bear against the frame 43, said cylinder V4 being served by intake pipes and discharge of pressurized fluid 47,48.
- 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.
- This device has many advantages over those previously known and, in particular, the following: - the various tightenings exerted by the jaws on the tie rods implement exclusively transverse displacements of the jaws applied to these tie rods, which excludes any recoil and relaxation of said tie rods during these tightenings: the maximum value of traction obtained at the end of each stroke of the traction cylinder can thus be maintained, the gripping jaws can be easily loosened during successive cycles and the desired tension T can be applied with precision to the tie 1 because of the total independence which exists between this tension and the clamping forces of said gripping jaws, - by playing on the obliquity of the mutually coagulating flat faces of the corners and of the frames, it is possible to adjust at will the jamming forces to be developed by each of the cylinders V2, V3 and V4 to generate determined clamping forces and particular to obtain relatively low values for these forces.
- 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
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Clamps And Clips (AREA)
- Warping, Beaming, Or Leasing (AREA)
- Reinforcement Elements For Buildings (AREA)
- Knitting Machines (AREA)
- Vehicle Body Suspensions (AREA)
- Jib Cranes (AREA)
- Rod-Shaped Construction Members (AREA)
- Ropes Or Cables (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
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 true EP0227546A2 (de) | 1987-07-01 |
| EP0227546A3 EP0227546A3 (en) | 1988-07-20 |
| EP0227546B1 EP0227546B1 (de) | 1991-04-24 |
Family
ID=9325828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86402826A Expired - Lifetime EP0227546B1 (de) | 1985-12-16 | 1986-12-16 | Vorrichtungen zum Spannen von Zugelementen vor der Verankerung |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0227546B1 (de) |
| JP (1) | JPS62156477A (de) |
| AT (1) | ATE62970T1 (de) |
| DE (1) | DE3678915D1 (de) |
| ES (1) | ES2021604B3 (de) |
| FR (1) | FR2591643B1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2650618A1 (fr) * | 1989-08-01 | 1991-02-08 | Holzmann Philipp Ag | Procede et dispositif d'enfilement de cables d'acier pour des organes de contrainte en faisceau dans des canaux de contrainte incurves dans un sens |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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)
| 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 (de) * | 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 |
-
1985
- 1985-12-16 FR FR8518596A patent/FR2591643B1/fr not_active Expired - Lifetime
-
1986
- 1986-12-16 ES ES86402826T patent/ES2021604B3/es not_active Expired - Lifetime
- 1986-12-16 AT AT86402826T patent/ATE62970T1/de not_active IP Right Cessation
- 1986-12-16 JP JP61299796A patent/JPS62156477A/ja active Granted
- 1986-12-16 EP EP86402826A patent/EP0227546B1/de not_active Expired - Lifetime
- 1986-12-16 DE DE8686402826T patent/DE3678915D1/de not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2650618A1 (fr) * | 1989-08-01 | 1991-02-08 | Holzmann Philipp Ag | Procede et dispositif d'enfilement de cables d'acier pour des organes de contrainte en faisceau dans des canaux de contrainte incurves dans un sens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0481028B2 (de) | 1992-12-22 |
| FR2591643B1 (fr) | 1990-11-02 |
| EP0227546A3 (en) | 1988-07-20 |
| JPS62156477A (ja) | 1987-07-11 |
| ES2021604B3 (es) | 1991-11-16 |
| FR2591643A1 (fr) | 1987-06-19 |
| EP0227546B1 (de) | 1991-04-24 |
| DE3678915D1 (de) | 1991-05-29 |
| ATE62970T1 (de) | 1991-05-15 |
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