GB772858A - Method and hydraulic jack for pretensioning the reinforcing of a prestressed concrete structure - Google Patents
Method and hydraulic jack for pretensioning the reinforcing of a prestressed concrete structureInfo
- Publication number
- GB772858A GB772858A GB17355/55A GB1735555A GB772858A GB 772858 A GB772858 A GB 772858A GB 17355/55 A GB17355/55 A GB 17355/55A GB 1735555 A GB1735555 A GB 1735555A GB 772858 A GB772858 A GB 772858A
- Authority
- GB
- United Kingdom
- Prior art keywords
- funnel
- anchoring head
- wall
- piston
- wires
- 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
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
772,858. Tensioning wires. LOSINGER & CO., SOC. ANON. June 16, 1955 [June 16, 1954], No. 17355/55. Class 45. [Also in Groups X and XXX] A method for pre-tensioning and anchoring the reinforcement of a prestressed concrete structure 1, comprises securing the reinforcing wires 5 in an anchoring head 6, 7, at such a distance from one of their ends that end portions 5a protrude from the anchoring head a jacking device being passed over the end portions 5a and connected to one part of the anchoring head a nut 22 being finally screwed onto an external thread 6a of the anchoring head as soon as the jacking device is released. As shown the jacking device comprises an inner tubular wall 10 having at one end an inner thread 10a engaging an external thread 6b of the anchoring head. At its opposite end the tubular wall 10 is connected by a ring 12 to an outer wall 11 having handles 29. An annular pressure chamber is formed in the jack between the walls 10 and 11 an annular piston 20 being mounted for axial movement in this pressure chamber. Pressure fluid may be introduced into the chamber through an opening 17 leading to a groove 16 formed in the ring 12. A tubular extension 20a of the piston 20 rests on a distribution plate 4. On operating the jack the conical funnel 6 is pulled outwardly, the nut 22 being screwed onto the external surface of the funnel 6 to hold the anchoring head in position. The wires 5 are held fast in the funnel 6 by means of a conical wedge 7 which is pushed into the funnel by a piston 26 sliding within the wall 10 and acted on by pressure fluid admitted through aperture 25. After releasing the jack the wire end portions 5a are bent outwardly and sealed in concrete to form an additional anchorage. In a modification the external thread 6b is replaced by an internal thread a corresponding alteration being made to the adjacent end of the wall 10, or a connecting tube may be used. Alternatively the screw connection could be replaced by a bayonet joint. Also the piston 26 may be omitted and a selfcontained corresponding unit used for wedging the wires in the funnel 6.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH772858X | 1954-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB772858A true GB772858A (en) | 1957-04-17 |
Family
ID=4535552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17355/55A Expired GB772858A (en) | 1954-06-16 | 1955-06-16 | Method and hydraulic jack for pretensioning the reinforcing of a prestressed concrete structure |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB772858A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3176961A (en) * | 1962-03-05 | 1965-04-06 | John P Glass | Hydraulic jack apparatus |
| US3351320A (en) * | 1966-03-31 | 1967-11-07 | P S C Equipment Ltd | System for securing wires in a stressed condition |
| US3554492A (en) * | 1967-12-26 | 1971-01-12 | Grands Travaux De Marseille Sa | Apparatus for drawing an anchor head on a rod or a tight cable |
| US3811652A (en) * | 1972-02-08 | 1974-05-21 | R Villaverde | Systems of anchorage to the traction jack of reinforcements to be post-tensioned |
-
1955
- 1955-06-16 GB GB17355/55A patent/GB772858A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3176961A (en) * | 1962-03-05 | 1965-04-06 | John P Glass | Hydraulic jack apparatus |
| US3351320A (en) * | 1966-03-31 | 1967-11-07 | P S C Equipment Ltd | System for securing wires in a stressed condition |
| US3554492A (en) * | 1967-12-26 | 1971-01-12 | Grands Travaux De Marseille Sa | Apparatus for drawing an anchor head on a rod or a tight cable |
| US3811652A (en) * | 1972-02-08 | 1974-05-21 | R Villaverde | Systems of anchorage to the traction jack of reinforcements to be post-tensioned |
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