US3837621A - Hydraulic jacks for tensioning reinforcement elements - Google Patents

Hydraulic jacks for tensioning reinforcement elements Download PDF

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Publication number
US3837621A
US3837621A US00289450A US28945072A US3837621A US 3837621 A US3837621 A US 3837621A US 00289450 A US00289450 A US 00289450A US 28945072 A US28945072 A US 28945072A US 3837621 A US3837621 A US 3837621A
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United States
Prior art keywords
plunger
mouth
channel
hydraulic
nose member
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Expired - Lifetime
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US00289450A
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English (en)
Inventor
J Gomez
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Manufacturas de Acero y Caucho SA
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Individual
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Assigned to MANUFACTURAS DE ACERO Y CAUCHO, S.A. reassignment MANUFACTURAS DE ACERO Y CAUCHO, S.A. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GOMEZ, JUAN B. R.
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Expired - Lifetime legal-status Critical Current

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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
    • E04G21/121—Construction of stressing jacks

Definitions

  • a hydraulic jack for tensioning reinforcing elements such as wires, rods, bars, cables or the like having a nose member with a longitudinal groove extending from its mouth so that the jack can be placed in position by a lateral movement.
  • a plunger having a longitudinal channel is adapted to slide in the groove of the nose member and the rod to be tensioned is arranged in the channel of the plunger.
  • a number of rams are mounted in the nose member to urge the plunger against biasing return springs towards the mouth to drive home anchor wedges in an anchoring plate for anchoring the rod.
  • a profile member is attached to the nose member.
  • the rod is tensioned by a traction gripper head mounted on a piston rod of a doubleacting'hydraulic assembly, which is mounted at the end of the profile member opposite the nose member.
  • the profile member has a longitudinal channel which is aligned with the channel of the plunger and the groove of the nose member. One edge of the profile member is turned back to provide a further protection channel for a hydraulic duct for the rams associated with the plunger.
  • This invention relates to a hydraulic jack for tensioning reinforcing elements such as wires, rods, bars, cables or the like for building and other constructional purposes.
  • the hydraulic jacks or cylinders employed for this purpose require an orifice at one of their ends to permit the introduction of the rods to be tensioned; this, in addition to involving considerable difficulty with regard to the construction of the mechanism as a whole, also causes a considerable loss of operators time during the introduction of the rods.
  • the present invention seeks to provide a hydraulic jack which avoids these disadvantages.
  • the invention also seeks to provide a hydraulic jack which has adequate means for permitting the lateral introduction of the rods, being at the same time provided with simple and effective mechanisms for anchoring the anchor jaws or clamps and for drawing or tensioning the rods.
  • a hydraulic jack for tensioning reinforcing wires, rods, bars, cables or the like, comprising: a nose member having a mouth for abutment against an anchoring plate, which receives anchor wedges for anchoring the reinforcing rod or the like, and having a longitudinal groove therein extending from said mouth to the other end of said nose member; a plunger longitudinally slidable in said groove for driving home the wedges of said anchoring plate, said plunger having a longitudinal channel therein for receiving an end portion of said reinforcing rod, said longitudinal groove and said longitudinal channel being aligned to permit lateral engagement of said end portion of the reinforcing rod in said channel; flange means on said plunger; hydraulic ram means for co-operating with said flange means for urging said plunger means towards said mouth to drive home the wedges of said anchoring plate; return biasing means for co-operating with said flange means for biasing said plunger away from said mouth
  • the grooved nose member is connected at its end opposite said mouth to a profile member having a longitudinal channel which is aligned with said groove of said nose member and said channel in said plunger
  • said traction means comprises a double-acting hydraulic piston and cylinder assembly coupled with said profile member, a piston rod mounted to said piston extends into said channel of the profile member and carries said gripping means.
  • said gripping means comprises a traction gripper device and said profile member has at least one of its edges folded outwardly to constitute a protective seating for the installation of the ducts of the hydraulic circuit of the machine.
  • FIG. 1 shows a longitudinal section through a hydraulic jack according to the invention
  • FIG. 2 is a cross sectional view of the jack, taken along the line 2-2 of FIG. 1 and looking in the direction of the arrows;
  • FIG. 3 is a cross sectional view of the jack, taken along the line 3-3 of FIG. 1 and looking in the direction of the arrows;
  • FIG. 4 is a cross sectional view of the jack, taken along the line 44 of FIG. 1 and looking in the direction of the arrows;
  • FIG. 5 is a cross sectional view of the jack, taken along the line 55 of FIG. 1 and looking in the direction of the arrows.
  • the hydraulic jack comprises a hollow cylinder 1 and a profile member 2 having a longitudinal channel.
  • the cylinder 1 and the profile member 2 being interconnected by a member 3, the position of which is intermediate relative to both.
  • a piston rod 4 is adapted to slide within the cylinder 1 and in the channel of profile member 2.
  • the front end of the piston rod 4, after being introduced into the channel or the profile member 2, is connected to a traction gripper head 5, this being conventional drawing gripper means, so that displacement of the piston rod 4 results also in movement of the traction gripper head 5.
  • Traction gripper head 5 has gripping means 6 with corresponding wedge-shaped jaws 7 urged by spring 7a to grip the rod or bar 8 during tensioning thereof.
  • the member 3 for connecting the cylinder 1 and profile member 2 operates as a partition delimiting a pressure chamber 9 formed by it and by a piston 10 connected to the rod 4, whereas a further pressure chamber 11 is delimited between the piston 10 and an end face 12 of the cylinder 1; a gasket 13 surrounding the piston 10 completes the hydraulic coupling between the piston 10 and the inner wall of cylinder 1.
  • a gasket 13 surrounding the piston 10 completes the hydraulic coupling between the piston 10 and the inner wall of cylinder 1.
  • In communication between the pressure chambers 9 and 11 are associated ducts 14 and 15 to which the appropriate circuit conduits may be connected.
  • the cylinder 1 and the associated piston 10 comprises a double-acting hydraulic assembly.
  • the double-acting hydraulic assembly together with the piston rod comprise the traction means for drawing the gripping means during tensioning.
  • a nose member 17 including a base plate 17a carrying,,at its free fact, a frustoconical nose portion 17b having a mouth for abutting an anchoring plate 22a, which receives wedges 22 for anchoring the rod 8 after tensioning.
  • the nose member 17 has a groove 18 extending longitudinally from the mouth 17c to the other end thereof and communicates with and includes a central axis cove 18a thereof.
  • a plunger 19 is slidably positioned in the portion of the groove 18 whichextends through the nose portion 17b and is provided with a longitudinal channel 19a which is aligned with groove 18 as shown in FIG. 3, so that the bar 8 can be laterally introduced into the nose member 17 and plunger 19.
  • a separate tubular structure 19b (see FIG. 4), which is independent of the jack, is threaded on the rod 8 before positioning the jack for tensioning. It is used to anchor wedges 22 in the anchoring plate 22a as hereinafter explained.
  • plunger 19 At its outer end plunger 19 has a flange on which act two hydraulic rams 20 contained in the base plate 17a.
  • Rams 20 are hydraulically actuated by hydraulic fluid introduced through duct 21 as shown in FIG. 5.
  • Duct 21 in turn communicates with the duct connected to the pressure chamber 11. In this way, on displacement of the piston rod 4 toward the mouth of the jack, for the purpose of releasing the cable 8 after tensioning, the hydraulic rams are actuated to displace the plunger 19 towards the mouth of the jack.
  • the end of the plunger 19 opposite the flange abuts the tubular structure 19b as shown in FIG. 1.
  • the tubular structure 19b is dimensioned to strike the wedges 22 disposed in the anchoring plate 22a to anchor rod 8 when plunger 19 is displaced towards the mouth of the jack.
  • the wedges 22 are simultaneously driven home to anchor the rod 8, since the rams 20 and pressure chamber 11 are fed in parallel.
  • the plunger 19 For withdrawal of the plunger 19, the latter is provided with associated springs 23 which on cessation of the pressure exerted by the rams 20, compel the plunger to return to its initial position.
  • the profile member 2 has an inverted omega shape as shown in FIG. 2. By having its edge portions turned back, profile member 24 provides a protection channel 25 for duct 21.
  • the use of the jack concerned permits the achievement of long travel paths of the bar 8 and also the locking of the wedges 22 with a high degree of precision, this being of vital importance with regard to the efficacy of clamping and the duration thereof, whilst at the same time traction, gripping and withdrawal from the jack are achieved with two single fluid inlets.
  • a hydraulic jack for tensioning reinforcing wires, rods, bars, cables or the like comprising a nose member having a mouth for abutment against an anchoring plate receiving anchor wedges for anchoring the reinforcing wire, rod, bar, cable or the like, and having a longitudinal groove therein extending from said mouth to the other end of said nose member, a plunger longitudinally slidable in said groove for driving home the wedges of said anchoring plate, said plunger having a longitudinal channel therein for receiving an end portion of said reinforcing wire, rod, bar, cable or the like, said longitudinal groove and said longitudinal channel being aligned to permit lateral introduction of said end portion in said channel, flange means on said plunger, hydraulic ram means for co-operating with said flange means for urging said plunger means towards said open mouth to drive home the wedges of said anchoring plate, return biasing means for co-operating with said flange means for biasing said plunger away from said mouth, gripping means for gripping said end portion and
  • a hydraulic jack according to claim 1 in which the end of said nose member opposite said mouth is connected to a profile member having a longitudinal channel therein which is aligned with said groove of the nose member and said channel of the plunger, and in which said traction means comprises a double-acting hydraulic assembly coupled with said profile member and a piston rod operatively connected to said double-acting hydraulic assembly, the piston rod extending into said channel of the profile member and carrying said gripping means.
  • a hydraulic jack according to claim '2 in which said gripping means comprises a traction gripper device.
  • a hydraulic jack according to claim 2 in which said profile member has an edge portion turnedback to form a further protection channel for at least one hydraulic duct.
  • a hydraulic jack according to claim 4 in which said hydraulic duct is connected to said hydraulic ram means.
  • a hydraulic jack for tensioning reinforcement elements for building purposes comprises a nose member having a mouth at one end for abutment against an anchoring plate receiving anchor wedges for anchoring a reinforcement element, a longitudinal groove in the nose member extending from the mouth to the other end of the nose member, a plunger slidable in the groove and having a longitudinal channel therein which is aligned with said groove to permit lateral introduction of said reinforcement element into said channel, hydraulic rarn means for moving said plunger towards said mouth, to drive home the wedges of the anchoring plate for anchoring said reinforcement element, and return biasing means for biasing said plunger away from said mouth.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Clamps And Clips (AREA)
US00289450A 1971-09-27 1972-09-15 Hydraulic jacks for tensioning reinforcement elements Expired - Lifetime US3837621A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES1971173142U ES173142Y (es) 1971-09-27 1971-09-27 Cilindro hidraulico para el estirado de varillas.

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US3837621A true US3837621A (en) 1974-09-24

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US (1) US3837621A (es)
DE (1) DE2236075B2 (es)
ES (1) ES173142Y (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030230032A1 (en) * 2002-06-13 2003-12-18 George Shahnazarian Take-up devices for use in building structure
US20120297694A1 (en) * 2009-04-28 2012-11-29 Jeong-Ryeol Kim Wire tensioner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998031897A1 (en) * 1997-01-17 1998-07-23 Applied Power Inc. Concrete reinforcement cable tensioner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1124587A (fr) * 1955-04-07 1956-10-15 Stup Procedes Freyssinet Vérin de mise en tension d'armatures
GB912588A (en) * 1960-02-09 1962-12-12 Odilo Paul Improvements in or relating to hydraulic pre-stressing means for reinforced concrete
DE1559093A1 (de) * 1965-08-17 1969-09-04 Pkm Hydraulik Karl Marx Stadt Steuereinrichtung fuer eine hydraulische Presse zum Spannen und Verankern eines Drahtes oder Drahtbuendels od.dgl. fuer Spannbeton
US3692277A (en) * 1971-03-03 1972-09-19 Inst Cercetari In Constructii Device for stressing tensionable armatures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1124587A (fr) * 1955-04-07 1956-10-15 Stup Procedes Freyssinet Vérin de mise en tension d'armatures
GB912588A (en) * 1960-02-09 1962-12-12 Odilo Paul Improvements in or relating to hydraulic pre-stressing means for reinforced concrete
DE1559093A1 (de) * 1965-08-17 1969-09-04 Pkm Hydraulik Karl Marx Stadt Steuereinrichtung fuer eine hydraulische Presse zum Spannen und Verankern eines Drahtes oder Drahtbuendels od.dgl. fuer Spannbeton
US3692277A (en) * 1971-03-03 1972-09-19 Inst Cercetari In Constructii Device for stressing tensionable armatures

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030230032A1 (en) * 2002-06-13 2003-12-18 George Shahnazarian Take-up devices for use in building structure
US20120297694A1 (en) * 2009-04-28 2012-11-29 Jeong-Ryeol Kim Wire tensioner
US8794596B2 (en) * 2009-04-28 2014-08-05 Samwoo Geotech Co., Ltd. Wire tensioner

Also Published As

Publication number Publication date
ES173142Y (es) 1972-08-16
DE2236075A1 (de) 1973-04-05
DE2236075B2 (de) 1975-09-18
ES173142U (es) 1972-03-01

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AS Assignment

Owner name: MANUFACTURAS DE ACERO Y CAUCHO, S.A., SPAIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GOMEZ, JUAN B. R.;REEL/FRAME:005277/0850

Effective date: 19900404