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EP0466645A1 - Vérin de tension - Google Patents

Vérin de tension Download PDF

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Publication number
EP0466645A1
EP0466645A1 EP91810513A EP91810513A EP0466645A1 EP 0466645 A1 EP0466645 A1 EP 0466645A1 EP 91810513 A EP91810513 A EP 91810513A EP 91810513 A EP91810513 A EP 91810513A EP 0466645 A1 EP0466645 A1 EP 0466645A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
counter
piston device
press according
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Withdrawn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
EP91810513A
Other languages
German (de)
English (en)
Inventor
Thomas Brönnimann
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.)
Bieri Hydraulik AG
Original Assignee
Bieri Hydraulik AG
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 Bieri Hydraulik AG filed Critical Bieri Hydraulik AG
Publication of EP0466645A1 publication Critical patent/EP0466645A1/fr
Withdrawn legal-status Critical Current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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53796—Puller or pusher means, contained force multiplying operator
    • Y10T29/5383—Puller or pusher means, contained force multiplying operator having fluid operator

Definitions

  • the present invention relates to a clamping press with two cylinder-piston devices, the pistons being connected to one another via their piston rods by a first leg and the cylinders by a second leg.
  • the tensioning press used in a niche 1 comprises a fixed leg 2 with a through opening 3 for the reinforcement cable to be tensioned and two threaded bores 4 and 5.
  • the lower part of the fixed leg 2 rests laterally on an anchor head 6 in the niche .
  • the anchor head 6 is connected to an anchor plate 7.
  • the anchor head 6 and the anchor plate 7 are also provided with through openings 8 and 9 for the reinforcement cable.
  • the tensioning press further comprises a movable leg 10 with a bore 11 for the reinforcement cable.
  • the movable leg 10 is suspended from an eyelet 12 attached to its upper end on a lifting device. On its side facing away from the fixed leg there is a in the movable leg provided with a threaded neck 13 and a threaded bore 14.
  • a master cylinder 15 is screwed onto the projection 13 and a counter-holding cylinder 16 is screwed into the bore 14.
  • a master piston 17 which is movable with respect to the master cylinder 15 is provided with a thread 18 at one end of its piston rod 39 and is screwed into the bore 4.
  • the main piston 17 is sealed with a seal 19 against the cylinder wall and with a seal 20 against a bore 21 in which it is guided in the movable leg 10.
  • the counter-holding piston 22 is also provided at one end of its piston rod 40 with a thread 23 which is screwed into the bore 5.
  • the counter-holding piston 22 is sealed with a seal 24 with respect to the inner wall of the cylinder, with a seal 25 in the end face 28 of the cylinder 16 and with a seal 26 in a bore 27 in which it is guided in the movable leg 10.
  • the counter piston 22 is extended beyond the end face 28 of the cylinder 16 with an extension 29.
  • a closed protective tube 30 is provided.
  • a feed line 31 is connected to the space 33 between the main piston end and the master cylinder end face 34 and the space 35 between the counter-holding piston rod 40 and the longitudinal wall of the counter-holding cylinder 16.
  • a return line 32 is connected to the space 36 between the main piston rod 39 and the longitudinal wall of the cylinder 15 and to the space 37 between the counter-holding piston 22 and the end face 28 of the counter-holding cylinder.
  • the cylinder chambers are cross-connected to each other.
  • hydraulic oil flows through the line 31 into the space 33 of the master cylinder, from the space 35 of the counter cylinder displaced hydraulic oil also flows into the Room 33 of the master cylinder.
  • Displaced hydraulic oil flows from space 36 to space 37 of the counter cylinder and into the tank.
  • the fixed leg 2 is supported by the anchor head 6 and the anchor plate 7 on the wall of the recess 1, ie the fixed leg 2 with the main piston 17 and the counter-holding piston 22 remain fixed, whereas the movable leg 10 with it connected master cylinder 15 and counter-cylinder 16 according to FIG. 1 moved to the right and the force is introduced into the cable to be tensioned.
  • the cable to be tensioned is connected to the movable leg 10 with a clamp unit 38.
  • the power delivery point at the bottom of the two legs 2, 10, which is eccentric to the cylinder axis of the master cylinder piston device 15, 17, generates a considerable lever torque on the tensioning press, the piston rod and guides of which would not be able to take it over.
  • the clamping press is therefore similar to the function of the support screw of a parallel screw clamp with the eccentrically arranged counter-cylinder piston device 16, 22 to compensate for the lever torque.
  • the counter-cylinder piston device is arranged, for example, at the same distance as the power delivery point, but on the opposite side of the master cylinder piston device, so that in order to compensate for the lever torque, it must generate a counterforce G of the same magnitude as the pretensioning force V which is released to the outside, but which does opposite to the direction of the press force P of the master cylinder piston device. Both the master cylinder piston device and the counter-cylinder piston device are double-acting.
  • the counter-cylinder piston device is also designed as a differential cylinder piston device, with the counter-piston 22 on each side half the piston surface of the corresponding communicating side of the main piston 17 having. Both in the tensioning movement and in the return movement, the same piston area ratio is created between the main piston and the counter-holding piston.
  • the tensioning press is shown in the tensioned state.
  • the axial space requirement in the niche 1 of the structure is less in the jack according to the invention.
  • the niche length is only 55 cm instead of 75 cm.
  • the space requirement in the inventive clamping press is smaller in the niche width (perpendicular to the plane of the drawing in FIGS. 1 and 2).
  • the tensioned armoring cable is finally anchored after the tensioning.
  • hydraulic oil flows through the line 32 into the space 36 of the master cylinder and from space 37 of the counter-cylinder also into space 36 of the master cylinder , and hydraulic oil from the space 33 of the master cylinder into the space 35 of the counter cylinder and into the tank.
  • FIG. 3 shows a further exemplary embodiment of the invention.
  • the same parts as in the exemplary embodiment according to FIGS. 1 and 2 are provided with the same reference symbols.
  • a change with respect to the first Embodiment results in the counter-cylinder piston device.
  • a normal double-acting cylinder piston device is provided, which, however, fulfills a function identical to that of the differential cylinder piston device.
  • the piston 42 guided in the cylinder 41 is connected to the fixed leg 2 via a piston rod 43 and a bracket 44.
  • the bracket 44 is with screws 45 and 46 with the piston rod 43 and. screwed to the fixed leg 2.
  • a seal 47 is attached in the piston and a seal 49 is attached to the end face 48 of the cylinder. In the niche with a small depth shown in FIG.
  • the master cylinder 15 moves over the surface 50 of the structure.
  • This has the advantage that very short niche lengths can also be used.
  • the use of short niche lengths is also made possible by installing the clamp unit 38 with the conical part 51 in the lower region of the movable leg 10.
  • a single-acting hydraulic system would also be conceivable, in which a spring would be located in the chamber 36 in the master cylinder and the counter-holding cylinder would only have the chamber 35.
  • the two legs at the power output point viewed in the tensioning direction, e.g. have a conically tapered shape and a fork-shaped slot for radial attachment to the tensioning cable.
  • This embodiment is particularly advantageous when individual strands are to be gripped and tensioned.
  • the jack could also be used to lift loads, with the fixed leg then on the floor and the movable leg would be pushed under the load to be lifted.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
EP91810513A 1990-07-13 1991-07-01 Vérin de tension Withdrawn EP0466645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2345/90 1990-07-13
CH234590 1990-07-13

Publications (1)

Publication Number Publication Date
EP0466645A1 true EP0466645A1 (fr) 1992-01-15

Family

ID=4231630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810513A Withdrawn EP0466645A1 (fr) 1990-07-13 1991-07-01 Vérin de tension

Country Status (3)

Country Link
US (1) US5228650A (fr)
EP (1) EP0466645A1 (fr)
JP (1) JPH079117B2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106437168A (zh) * 2016-10-10 2017-02-22 天津盛泰佳业科技有限公司 通用建材张拉装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7430984B2 (en) * 2000-08-11 2008-10-07 Applied Materials, Inc. Method to drive spatially separate resonant structure with spatially distinct plasma secondaries using a single generator and switching elements

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696040A (en) * 1950-09-15 1954-12-07 Preload Co Inc Method and apparatus for prestressing
GB881191A (en) * 1957-05-28 1961-11-01 Nat Res Dev Improvements in and relating to the prestressing of concrete
US3285569A (en) * 1965-05-10 1966-11-15 Prescon Corp Apparatus for post-tensioning concrete structures
DE1659109A1 (de) * 1967-09-25 1970-12-23 Howlett Machine Works Vorrichtung und Verfahren zum Vorspannen von Beton

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2101141A (en) * 1934-11-01 1937-12-07 Star Expansion Bolt Company Tie for concrete forms
US2075239A (en) * 1936-03-02 1937-03-30 James Hodgson Concrete form clamp
US2866370A (en) * 1956-02-02 1958-12-30 John L Biach Bolt-tensioning and nut-seating apparatus
US3785617A (en) * 1971-12-15 1974-01-15 Vsl Corp Method for inserting tendons into sheathing
DE3109687C2 (de) * 1981-03-13 1985-06-27 Dyckerhoff & Widmann AG, 8000 München Gerät zum Verbinden von zwei stumpf gestoßenen Bewehrungsstäben mittels einer Muffe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696040A (en) * 1950-09-15 1954-12-07 Preload Co Inc Method and apparatus for prestressing
GB881191A (en) * 1957-05-28 1961-11-01 Nat Res Dev Improvements in and relating to the prestressing of concrete
US3285569A (en) * 1965-05-10 1966-11-15 Prescon Corp Apparatus for post-tensioning concrete structures
DE1659109A1 (de) * 1967-09-25 1970-12-23 Howlett Machine Works Vorrichtung und Verfahren zum Vorspannen von Beton

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106437168A (zh) * 2016-10-10 2017-02-22 天津盛泰佳业科技有限公司 通用建材张拉装置
CN106437168B (zh) * 2016-10-10 2019-03-05 湖北国丰建设有限公司 通用建材张拉装置

Also Published As

Publication number Publication date
JPH04306362A (ja) 1992-10-29
US5228650A (en) 1993-07-20
JPH079117B2 (ja) 1995-02-01

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