EP0160509A2 - Anchor grip for tensioned elements in concrete structures - Google Patents
Anchor grip for tensioned elements in concrete structures Download PDFInfo
- Publication number
- EP0160509A2 EP0160509A2 EP85302883A EP85302883A EP0160509A2 EP 0160509 A2 EP0160509 A2 EP 0160509A2 EP 85302883 A EP85302883 A EP 85302883A EP 85302883 A EP85302883 A EP 85302883A EP 0160509 A2 EP0160509 A2 EP 0160509A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- barrel
- grip
- spring
- head
- wall
- 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- Withdrawn
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
- E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
Definitions
- the invention relates to an improved anchor grip of the type useful in tensioning the wires, rods or stranded elements in prestressed concrete structures, and in particular is an improvement in or modification of the anchor grip described in British patent 1018967.
- That patent discloses an anchor grip comprising a body formed with a centre bore, a wedge device consisting of a plurality of tapered wedge elements arranged adjacent one end of the body and within the central bore to engage the wire to be gripped, a detachable plug provided at the other end of the body, a compression spring between the plug and the larger end of the wedge elements, wherein a cap member for maintaining axial alignment of the wedge elements is arranged between the spring and the larger ends of the elements, the cap comprising an annulus which is freely movable in the central bore.
- This known anchor grip is marketed as the CCL XL enclosed grip for strand (CCL is a registered trade mark). It is a commercially successful grip but there is a drawback in that the cap is an extra item which adds to the cost and by its presence it is not easy to see whether the elongate element has been gripped within the device.
- an anchor grip for engaging an end portion of a length of wire or the like, the grip comprising an elongate barrel containing a wedge gripping device and a spring for retaining the device in the barrel, the barrel being open at both ends, characterised in that the spring is a taper spring of sufficient length to hold the device in the barrel and is biased at one end against the head of the device and at the other end against the wall of the barrel, and in that the head of the device is visible from one end of the barrel.
- the wall of the barrel may be formed with abutment means better to engage the end turn of the spring and that wall.
- abutment means comprises a slot to receive the end turn of the spring.
- the wall of the barrel in the region of the spring is sufficiently thick to allow the nose of a hydraulic jack to be abutted against that end of the grip whereby the connection of the element and the grip may be stressed.
- the grip of Figure 1 comprises a barrel 1 having a central bore comprising a frustoconical bore portion 2 and a wider diameter cylindrical bore portion 3.
- the grip contains a wedge device W of a known type and comprising a number (2, 3 or 4) of tapering wedge segments 4. At their wider ends 4a the segments form the head H of the device W and are held together by an 0-ring 5 received in a groove 6 in the segments.
- a length of wire E, Figure 2 may be gripped by the grip by sliding the grip to engage clean wire to the desired location.
- the wall of the bore portion 2 is sufficiently thick, e.g. 6 mm, to allow the nose of a hydraulic stressing jack, not shown, to be biased against it whereby the connection may be stressed.
- a slot 8 is present in the wall of the bore part 3 and the last end turn 9 of the spring 7 is anchored in the slot 8.
- the operator uses the grip as described in relation to the embodiment of Figure 1 and because the bore part 3 is open, he can see the engagement through the spring 7 to ensure that a proper connection has been made.
- E, 13 mm in diameter the grip may be about 76 mm long and 38 mm in external diameter.
Abstract
An anchor grip for use in tensioning an elongate element for a prestressed concrete structure comprises an elongate barrel (1) open at both ends (2,3), containing a wedge gripping device (W), a taper spring (7) being biased at one end against the head (H) of the device (W) and at the other end against an inside wall (8) of the barrel. After a connection has been made within the barrel (1) (Figure 2), the head (H) of the device (W) is visible from one end (3) of the barrel (1) for an operator to see that a proper connection has been made.
Description
- The invention relates to an improved anchor grip of the type useful in tensioning the wires, rods or stranded elements in prestressed concrete structures, and in particular is an improvement in or modification of the anchor grip described in British patent 1018967. That patent discloses an anchor grip comprising a body formed with a centre bore, a wedge device consisting of a plurality of tapered wedge elements arranged adjacent one end of the body and within the central bore to engage the wire to be gripped, a detachable plug provided at the other end of the body, a compression spring between the plug and the larger end of the wedge elements, wherein a cap member for maintaining axial alignment of the wedge elements is arranged between the spring and the larger ends of the elements, the cap comprising an annulus which is freely movable in the central bore.
- This known anchor grip is marketed as the CCL XL enclosed grip for strand (CCL is a registered trade mark). It is a commercially successful grip but there is a drawback in that the cap is an extra item which adds to the cost and by its presence it is not easy to see whether the elongate element has been gripped within the device.
- It is one object of this invention to provide an anchor grip for the purpose specified, which is cheaper to make and easier and safer to use in that the operator can visually inspect the connection between the element and the gripping device within the barrel to ensure that a_proper engagement has been made.
- According to one aspect of this invention, there is provided an anchor grip for engaging an end portion of a length of wire or the like, the grip comprising an elongate barrel containing a wedge gripping device and a spring for retaining the device in the barrel, the barrel being open at both ends, characterised in that the spring is a taper spring of sufficient length to hold the device in the barrel and is biased at one end against the head of the device and at the other end against the wall of the barrel, and in that the head of the device is visible from one end of the barrel.
- The wall of the barrel may be formed with abutment means better to engage the end turn of the spring and that wall. In a preferred feature the abutment means comprises a slot to receive the end turn of the spring.
- In a preferred feature, the wall of the barrel in the region of the spring is sufficiently thick to allow the nose of a hydraulic jack to be abutted against that end of the grip whereby the connection of the element and the grip may be stressed.
- In order that the invention may be well understood, it will now be described with reference to the accompanying diagrammatic drawing, in which
- Figure 1 is a sectional view of one anchor grip, and
- Figure 2 is a sectional view of another anchor grip, in engagement with a length of wire.
- The grip of Figure 1 comprises a barrel 1 having a central bore comprising a
frustoconical bore portion 2 and a wider diametercylindrical bore portion 3. The grip contains a wedge device W of a known type and comprising a number (2, 3 or 4) of tapering wedge segments 4. At their wider ends 4a the segments form the head H of the device W and are held together by an 0-ring 5 received in a groove 6 in the segments. Ataper spring 7, e.g. of the type available from Airedale Springs Limited, Yorkshire, England, is biased at one end (the rarrow end) against the head 4 of the wedge device W and at the other end against the inner wall of thebore part 3. A length of wire E, Figure 2, may be gripped by the grip by sliding the grip to engage clean wire to the desired location. Because thebore part 3 is open, an operator can visually inspect the grip by looking through thespring 7 to ensure that a proper engagement has been made between the wire and the device W. The wall of thebore portion 2 is sufficiently thick, e.g. 6 mm, to allow the nose of a hydraulic stressing jack, not shown, to be biased against it whereby the connection may be stressed. - In the embodiment of Figure 2, a slot 8 is present in the wall of the
bore part 3 and the last end turn 9 of thespring 7 is anchored in the slot 8. The operator uses the grip as described in relation to the embodiment of Figure 1 and because thebore part 3 is open, he can see the engagement through thespring 7 to ensure that a proper connection has been made. For use in receiving a strand or other elongate element, E, 13 mm in diameter the grip may be about 76 mm long and 38 mm in external diameter.
Where possible the same reference numerals are used to describe the different embodiments.
Claims (8)
1. An anchor grip for engaging an end portion of a length of wire or the like, the grip comprising an elongate barrel (1) containing a wedge gripping device (W) and a spring (7) for retaining the device in the barrel (1) the barrel (1) being open at both ends (2, 3) characterised in that the spring (7) is a taper spring to hold the device (W) in the barrel (1) and is biased at one end against the head of the device (W) and at the other end against the wall of the barrel (1) and in that the head of the device (W) is visible from one end (3) of the barrel (1).
2. A grip according to Claim 1 characterised in that abutment means (8) is present at the wall of the barrel (1) and the adjacent end turn (9) of the spring (7) is abutted against the abutment means (8).
3. A grip according to Claim 1 or 2 characterised in that the abutment means (8) comprises a slot (8) and the end turn (9) is received in the slot (8).
4. A grip according to any preceding Claim characterised in that the wall of the barrel (1) is thick so that a stressing jack may be biased thereon.
5. A grip according to any preceding Claim characterised in that the bore (2, 3) of the barrel (1) comprises a frusto conical portion (2) in which the gripping device (W) is located and a generally cylindrical portion (3) in which the spring (7) is located.
6. A grip according to any preceding Claim characterised in that the head (H) of the device (W) visible from one end (3) of the barrel (1) is formed of the wider ends (4a) of the segments of the device (W).
7. A grip according to any preceding Claim characterised in that the narrow end of the spring (7) is biased against the head (H) of the device (W).
8. A connection formed of an elongate element (E) and a grip characterised in that the grip is according to any preceding Claim and in that the connection of the element (E) and the device (W) is visible from one end (3) of the barrel (1) through the spring (7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB848410477A GB8410477D0 (en) | 1984-04-24 | 1984-04-24 | Anchor grip |
GB8410477 | 1984-04-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0160509A2 true EP0160509A2 (en) | 1985-11-06 |
EP0160509A3 EP0160509A3 (en) | 1987-02-04 |
Family
ID=10560007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85302883A Withdrawn EP0160509A3 (en) | 1984-04-24 | 1985-04-24 | Anchor grip for tensioned elements in concrete structures |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0160509A3 (en) |
GB (1) | GB8410477D0 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103741885A (en) * | 2013-12-21 | 2014-04-23 | 广西科技大学 | Jaw vice anchorage for stretching carbon fiber boards |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3078112A (en) * | 1961-01-12 | 1963-02-19 | Union Metal Mfg Co | Coupling for wire strand and the like |
US3374511A (en) * | 1966-01-10 | 1968-03-26 | Cable Cover Ltd | Cable grip |
US4059931A (en) * | 1976-01-29 | 1977-11-29 | Mongan William T | Building framing system for post-tensioned modular building structures |
-
1984
- 1984-04-24 GB GB848410477A patent/GB8410477D0/en active Pending
-
1985
- 1985-04-24 EP EP85302883A patent/EP0160509A3/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3078112A (en) * | 1961-01-12 | 1963-02-19 | Union Metal Mfg Co | Coupling for wire strand and the like |
US3374511A (en) * | 1966-01-10 | 1968-03-26 | Cable Cover Ltd | Cable grip |
US4059931A (en) * | 1976-01-29 | 1977-11-29 | Mongan William T | Building framing system for post-tensioned modular building structures |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103741885A (en) * | 2013-12-21 | 2014-04-23 | 广西科技大学 | Jaw vice anchorage for stretching carbon fiber boards |
Also Published As
Publication number | Publication date |
---|---|
EP0160509A3 (en) | 1987-02-04 |
GB8410477D0 (en) | 1984-05-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4619088A (en) | Stressed reinforcing tendon and structure including such a tendon | |
ES2275266T3 (en) | IMPROVEMENTS RELATED TO SCREWS. | |
US3937607A (en) | Post-tensioning anchors assembled in combination with a spacer strip | |
US2834081A (en) | Rod fastener | |
US3422501A (en) | End anchorage for prestressing steel strands for use in prestressed concrete structures | |
JPH0617580B2 (en) | Removable tension material | |
EP0044305B1 (en) | Engagement lock | |
US20080083473A1 (en) | Wire splicer | |
EP0160509A2 (en) | Anchor grip for tensioned elements in concrete structures | |
EP0161115B1 (en) | Improved anchor grip for tensioned elements in concrete structures | |
US4223497A (en) | Coupling assembly | |
KR101609619B1 (en) | Grip type wedge for the unbonded p.c strand fixing portion | |
ATE285000T1 (en) | CABLE SUSPENSION FOR A SUSPENSION BRIDGE | |
ES302363A1 (en) | Improvements in and relating to anchor grips for use in tensioning the wires,rods or stranded elements in prestressed concrete structures | |
CN203836077U (en) | Tail end fastening structure of rope | |
US3888596A (en) | Jacking anchor for post-tensioning concrete | |
GB2157339A (en) | Cable anchorages | |
PT892472E (en) | A PROCESS AND DEVICE FOR CONNECTING A BEAM THAT IS COMPOSED OF FILAMENTS TO A HOLE OR A CAP | |
KR100522081B1 (en) | For connection fixing tool and tension material | |
JP2003268766A (en) | Anchor repairing tool and anchor repairing method | |
JP2000345656A (en) | Crimp grip for pc steel product | |
US3488903A (en) | Positive clamping and anchoring means for elongated metal members | |
US2898655A (en) | Cable ferrule | |
JPH11117456A (en) | Fixed section structure for pc steel stranded wire | |
RU193534U1 (en) | FASTENING DEVICE FOR MULTI-ORDER CABLE |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
RBV | Designated contracting states (corrected) |
Designated state(s): BE FR GB IT NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE FR GB IT NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19870805 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BREARLEY, DAVID |