EP0108558A2 - Dispositif d'ancrage du type à coin - Google Patents

Dispositif d'ancrage du type à coin Download PDF

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Publication number
EP0108558A2
EP0108558A2 EP83306527A EP83306527A EP0108558A2 EP 0108558 A2 EP0108558 A2 EP 0108558A2 EP 83306527 A EP83306527 A EP 83306527A EP 83306527 A EP83306527 A EP 83306527A EP 0108558 A2 EP0108558 A2 EP 0108558A2
Authority
EP
European Patent Office
Prior art keywords
wedge
strand
diameter
wire
coating
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Withdrawn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
EP83306527A
Other languages
German (de)
English (en)
Other versions
EP0108558A3 (fr
Inventor
Michael Arthur Smith
David Brearley
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.)
CCL Systems Ltd
Original Assignee
CCL Systems Ltd
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 CCL Systems Ltd filed Critical CCL Systems Ltd
Publication of EP0108558A2 publication Critical patent/EP0108558A2/fr
Publication of EP0108558A3 publication Critical patent/EP0108558A3/fr
Withdrawn legal-status Critical Current

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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

  • This invention relates to a wedge type anchorage device of the kind used in prestressing of concrete structures.
  • wedge type anchorage device is meant a device in which a stressing wire or strand may be anchored in a conical, or part conical, bore by means of two or more arcuate wedge elements, the bore being formed in a cylindrical barrel which provides a so-called anchor grip, or being formed, as one of a plurality of bores, in a plate or the like forming part of a concrete structure, or of a stressing jack or other stressing apparatus.
  • a wedge type anchorage device having a protective.anti-rust coating of a relatively low viscosity.
  • a suitable rust preventative is one having a viscosity of the order of 73 centistokes at 20°C. Fluids of higher viscosity e.g. greasy or wax films are not suitable as the efficiency of such coated wedges is too low.
  • a strand anchored by a wedge of the invention will, when stressed using the hydraulic jack of our co-pending Application, have an efficiency of 95% of more, i.e. the strand will not fail until it reaches 95% of its ultimate tensile strength.
  • the wedges may be adapted for use with strands ranging from about 12 mm to about 18 mm in diameter. For a 13 mm diameter the wedge may weigh about 45 - 60 grams, a saving of about 35% by weight; for a 16 mm diameter wedge the weight may range from about 65 to 85 grams, a saving of about 50% by weight.
  • the invention specifically includes wedges having a coating and measuring about 39 mm and about 23 mm average diameter; and about 44 mm long and about 31 mm average diameter.
  • the conical surfaces of the wedge elements only, or the conical surfaces of the barrels or plates, or the conical surfaces of both the wedges and the barrels or plates may be coated. Alternatively, all of the surfaces of the wedges and/or the barrels may be coated.
  • the wedge of Figure 1 comprises two identical wedge elements 2. Each element is formed of case hardened steel. The element is conical and has a wider end 3, the right hand end as seen in Figure 2, and tapers to a narrower end 4, the left hand end as seen in Figure 2. A groove is formed adjacent the wider end 3, to receive a wire or spring 6, by which the two wedge elements 2 are held together. The wedge elements together define a bore 10 for gripping a wire, strand etc 7. The wedge 1 is received in a socket 8 in a plate 9 abutting a concrete structure. The outer surface of the wedge elements is, according to the invention, coated with RUSTBAN 335, a rust preventative marketed by ESSO and having a viscosity of 73 centistokes at 20°C. The wedge is about 44 mm long, and has a bore 10 which is about 15 mm in diameter at the wider end 3 and about 18 mm at the narrower end 4. The overall diameter at the wider end 3 is about 28 mm. The wedge weighs about 80 grams.
  • the invention is illustrated by the following comparative Example. Wedges having the dimensions and weight indicated in the Table were coated as indicated and then used to tension a strand of 13 mm or 15 mm diameter as indicated. The efficiency was then measured when the strand was tensioned.
  • the results show that to achieve an efficiency of 95% with a known 13 mm wedge having a waxy film, the wedge must weigh 83 grams. Decreasing the size of the wedge while using the same coating drops the efficiency.
  • the wedge can be smaller and weigh 55 grams and having a coating as defined and still have an efficiency of 95%. In other words, one can have a weight saving of 31%. In the case of 15 mm wedge, the invention works in the same way but the weight saving is 152 - 80 grams, i.e. 72 grams, i.e. 47%.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP83306527A 1982-11-02 1983-10-27 Dispositif d'ancrage du type à coin Withdrawn EP0108558A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8231273 1982-11-02
GB8231273 1982-11-02

Publications (2)

Publication Number Publication Date
EP0108558A2 true EP0108558A2 (fr) 1984-05-16
EP0108558A3 EP0108558A3 (fr) 1985-06-05

Family

ID=10533989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83306527A Withdrawn EP0108558A3 (fr) 1982-11-02 1983-10-27 Dispositif d'ancrage du type à coin

Country Status (4)

Country Link
EP (1) EP0108558A3 (fr)
AU (1) AU557176B2 (fr)
IN (1) IN160946B (fr)
ZA (1) ZA838017B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004094744A1 (fr) * 2003-04-18 2004-11-04 Sumitomo (Sei) Steel Wire Corp. Structure anti-deviation pour un coin
WO2004094745A1 (fr) * 2003-04-18 2004-11-04 Sumitomo (Sei) Steel Wire Corp. Cale destinee a fixer une tige d'acier pc

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB811573A (en) * 1955-05-18 1959-04-08 Ionic Plating Company Ltd Improvements in or relating to screw threaded fastenings
US3588045A (en) * 1969-01-31 1971-06-28 Allan H Stubbs Prestressing apparatus
US3755880A (en) * 1969-09-26 1973-09-04 J Simms Tensioning devices
DE2550137C3 (de) * 1975-11-07 1979-01-18 Gallus Prof. Dr.-Ing. 8000 Muenchen Rehm Keilverankerung für hochfeste Zugglieder
US4114505A (en) * 1977-01-31 1978-09-19 Loeser William J Coatings and methods of application
AT373015B (de) * 1980-05-24 1983-12-12 Strabag Bau Ag Verankerung fuer ein spanndrahtbuendel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004094744A1 (fr) * 2003-04-18 2004-11-04 Sumitomo (Sei) Steel Wire Corp. Structure anti-deviation pour un coin
WO2004094745A1 (fr) * 2003-04-18 2004-11-04 Sumitomo (Sei) Steel Wire Corp. Cale destinee a fixer une tige d'acier pc
KR101037258B1 (ko) 2003-04-18 2011-05-26 스미토모 덴코 스틸 와이어 가부시키가이샤 Ｐｃ강재의 정착용 웨지

Also Published As

Publication number Publication date
ZA838017B (en) 1984-12-24
AU557176B2 (en) 1986-12-11
IN160946B (fr) 1987-08-15
AU2084483A (en) 1984-05-10
EP0108558A3 (fr) 1985-06-05

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Inventor name: SMITH, MICHAEL ARTHUR

Inventor name: BREARLEY, DAVID