US3748723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of anchoring wires and strands in prestressed concrete
Assignee: Kobelco Wire Co Ltd
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Filing: 1971-06-04
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Granted: 1973-07-31
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Expires: 1991-06-04
Abstract
Abstract A method of anchoring wires or strands in prestressed concrete comprising the steps of twisting a non-circular cross section wire to form a coil in a steel sleeve having a length equal to about two times the diameter of the wire or strand, engaging a free end of the wire with the twisted wire coil by sliding the sleeve and twisted wire coil over the wire or strand, and fixing the sleeve by swaging or pressing within the range of 10-30 percent of reduction ratio. Thus, an anchorage having improved anchorage efficiency which avoids shearing failure of PC wire at the point of anchorage is provided.
Inventors
- 👤 H Tomioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:10
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/08; E04C5/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49929
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A method of anchoring at least one wire or strand for prestressed concrete comprising the steps of: twisting a wire having a non-circular cross section to form a coil in a steel sleeve having a length equal to at least two times the diameter of the wire or strand; sliding the sleeve containing the twisted wire coil over said at least one wire or strand in said concrete to be anchored to a position adjacent an anchor plate associated with said concrete; and deforming the sleeve to secure the same to the twisted wire coil and to the wire or strand and to abut said anchor plate.
Claim 2
Independent Claim
107 words
A method of anchoring at least one wire or strand for prestressed concrete comprising the steps of: twisting a wire having a non-circular cross section to form a coil in a steel sleeve having a length equal to at least two times the diameter of the wire or strand; sliding the sleeve containing the twisted wire coil over said at least one wire or strand in said concrete to be anchored to a position adjacent an anchor plate associated with said concrete; and deforming the sleeve to secure the same to the twisted wire coil and to the wire or strand and to abut said anchor plate.
Claim 3
Dependent Claim
15 words
A method as set forth in claim 1, wherein said sleeve is secured by swaging.
Claim 4
Dependent Claim
24 words
A method as set forth in claim 2, wherein said sleeve is secured by swaging within the range of 10-30 percent of reduction ratio.
Claim 5
Dependent Claim
15 words
A method as set forth in claim 1, wherein said sleeve is secured by pressing.
Claim 6
Dependent Claim
24 words
A method as set forth in claim 4, wherein said sleeve is secured by pressing within the range of 10-30 percent of reduction ratio.
Claim 7
Dependent Claim
43 words
A method as set forth in claim 1, wherein the sleeve has a tapered relief at the end which is slid over the wire or strand and where the wire or strand is closely wound by the non-circular cross section twisted wire coil.
Claim 8
Dependent Claim
47 words
A method a set forth in claim 1, wherein the sleeve has a relief groove in its outer periphery at one end which is slid over the wire or strand and where the wire or strand is closely wound by the non-circular cross section twisted wire coil.
Claim 9
Independent Claim
133 words
A method of anchoring a plurality of wires or strands in prestressed concrete comprising the steps of: twisting a plurality of wires having a non-circular cross sections to form coils; disposing said plurality of twisted wire coils one each in a plurality of metallic sleeves having lengths equal to at least twice the diameter of the wires or strands; sliding the sleeves containing the twisted wire coils over free ends of the respective wires or strands in the concrete to be anchored to a position adjacent an anchor plate associated with said concrete; and deforming each of said sleeves to cause said twisted wire coils therein to penetrate the interior surfaces of said sleeves and the exterior surfaces of said wires or strands and to cause said sleeves to abut said anchor plate.
Claim 10
Independent Claim
133 words
A method of anchoring a plurality of wires or strands in prestressed concrete comprising the steps of: twisting a plurality of wires having a non-circular cross sections to form coils; disposing said plurality of twisted wire coils one each in a plurality of metallic sleeves having lengths equal to at least twice the diameter of the wires or strands; sliding the sleeves containing the twisted wire coils over free ends of the respective wires or strands in the concrete to be anchored to a position adjacent an anchor plate associated with said concrete; and deforming each of said sleeves to cause said twisted wire coils therein to penetrate the interior surfaces of said sleeves and the exterior surfaces of said wires or strands and to cause said sleeves to abut said anchor plate.
Claim 11
Dependent Claim
15 words
A method as set forth in claim 8, wherein said sleeves are deformed by swaging.
Claim 12
Dependent Claim
15 words
A method as set forth in claim 8, wherein said sleeves are deformed by pressing.
Claim 13
Independent Claim
207 words
A method of anchoring at least one wire or strand for prestressed concrete comprising the steps of: twisting a wire having a non-circular cross section to form a coil for each of said at least one wire or strand; positioning each of said twisted wire coils in a separate metallic sleeve having a length at least twice the diameter of said at least one wire or strand; relieving said separate metallic sleeves adjacent one end thereof adapted to be positioned against an anchOring plate; sliding each of the relieved sleeves containing a twisted wire coil over the free end of one of said at least one wire or strand adapted to be anchored in said concrete with the anchoring plate positioned between said concrete and said free ends of said at least one wire or strand; and deforming each of said sleeves about said at least one wire or strand to cause said twisted wire coils therein to penetrate the interior surfaces of said sleeves and the exterior surfaces of said at least one wire or strand and to provide a planar surface of contact between said sleeves and said anchoring plate through the relief of said sleeves adjacent said one end thereof adjacent said anchoring plate.
Claim 14
Independent Claim
207 words
A method of anchoring at least one wire or strand for prestressed concrete comprising the steps of: twisting a wire having a non-circular cross section to form a coil for each of said at least one wire or strand; positioning each of said twisted wire coils in a separate metallic sleeve having a length at least twice the diameter of said at least one wire or strand; relieving said separate metallic sleeves adjacent one end thereof adapted to be positioned against an anchOring plate; sliding each of the relieved sleeves containing a twisted wire coil over the free end of one of said at least one wire or strand adapted to be anchored in said concrete with the anchoring plate positioned between said concrete and said free ends of said at least one wire or strand; and deforming each of said sleeves about said at least one wire or strand to cause said twisted wire coils therein to penetrate the interior surfaces of said sleeves and the exterior surfaces of said at least one wire or strand and to provide a planar surface of contact between said sleeves and said anchoring plate through the relief of said sleeves adjacent said one end thereof adjacent said anchoring plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |