EP0050346B1 - An anchoring head for strands or cables for tensioning metal or concrete structures - Google Patents

An anchoring head for strands or cables for tensioning metal or concrete structures Download PDF

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Publication number
EP0050346B1
EP0050346B1 EP81108474A EP81108474A EP0050346B1 EP 0050346 B1 EP0050346 B1 EP 0050346B1 EP 81108474 A EP81108474 A EP 81108474A EP 81108474 A EP81108474 A EP 81108474A EP 0050346 B1 EP0050346 B1 EP 0050346B1
Authority
EP
European Patent Office
Prior art keywords
strands
cables
plates
adjoining
concrete structures
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
Application number
EP81108474A
Other languages
German (de)
French (fr)
Other versions
EP0050346A2 (en
EP0050346A3 (en
Inventor
Cesare Previdini
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.)
FIN EST SpA
PONTEGGI EST SpA
Original Assignee
FIN EST SpA
PONTEGGI EST SpA
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 FIN EST SpA, PONTEGGI EST SpA filed Critical FIN EST SpA
Publication of EP0050346A2 publication Critical patent/EP0050346A2/en
Publication of EP0050346A3 publication Critical patent/EP0050346A3/en
Application granted granted Critical
Publication of EP0050346B1 publication Critical patent/EP0050346B1/en
Expired 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
    • E04C5/125—Anchoring devices the tensile members are profiled to ensure the anchorage, e.g. when provided with screw-thread, bulges, corrugations

Definitions

  • This invention relates to an anchoring head for cables or strands, wherein the front bearing plate to the structure is provided with connections for the strands which are arranged at the vertices of adjoining equilateral triangles.
  • GB-A-864170 foresees anchoring plates having connections disposed with a pattern of adjoining equilaterial triangles, but no provision is made neither for fixing one anchoring plate to the other nor for avoiding a discontinuity of stresses in the zones where two contiguous plates meet.
  • AU-B-484438 provides a coupling for the periphery of flanges of anchoring heads, but nothing is foreseen for uniformally distributing the load within the plates nor in the zones where two adjacent plates meet.
  • the main object has been accomplished by providing an anchoring plate as specified in claim 1.
  • a head according to the present invention comprises a cone 10 secured to the end of a sheath 12, having a series of tubes 11 branching off therefrom, one for each cable or strand, which tubes act as coatings therefor.
  • the series of holes 21 is arranged at such a position as to form a lattice of adjoining equilateral triangles, at the vertices of which said holes 21 are provided. Reinforcing ribs 23 are provided between the holes 21.
  • the periphery 22 of plate 20 is provided with mutual coupling members 25 and 26 securing one plate relative to the adjoining plates.
  • Further portions of this periphery 22 are shaped with projections 27 and recesses 28 which work as coupling members and placed in such a way as to be inserted between the sides of the various equilateral triangles, so that the arrangement of the strands of a plurality of adjoining plates always corresponds to the vertices of equilateral triangles, as shown in Fig. 4.
  • the distance d between two holes 21 remains unaltered even if measured between two holes 21 pertaining to two adjoining plates 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Description

  • This invention relates to an anchoring head for cables or strands, wherein the front bearing plate to the structure is provided with connections for the strands which are arranged at the vertices of adjoining equilateral triangles.
  • GB-A-864170 foresees anchoring plates having connections disposed with a pattern of adjoining equilaterial triangles, but no provision is made neither for fixing one anchoring plate to the other nor for avoiding a discontinuity of stresses in the zones where two contiguous plates meet.
  • AU-B-484438 provides a coupling for the periphery of flanges of anchoring heads, but nothing is foreseen for uniformally distributing the load within the plates nor in the zones where two adjacent plates meet.
  • Therefore, it is the object of the present invention to provide on the structure to be tensioned by means of the plate a perfect positioning of the cables or strands together with a maximum utilization of the available space and the most uniform distribution of the stresses.
  • It is a further object of the invention to improve the anchoring of the plate to the concrete.
  • The main object has been accomplished by providing an anchoring plate as specified in claim 1.
  • Other advantageous embodiments are described in claims 2 and 3.
  • The present invention will now be better explained with reference to an exemplary embodiment that has been shown in the figures of the accompanying drawing, in which:
    • Fig. 1 is a side, partly sectional view of a head according to the present invention, the sectional view being taken along line 1-1 of Fig. 2;
    • Fig. 2 is a view of the front plate from the side 2-2 of Fig. 1;
    • Fig. 3 is a sectional view taken along line 3-3 of Fig. 1; and
    • Fig. 4 is a view similar to Fig. 2, but showing a plurality of juxtaposed plates.
  • From the drawing it will be seen that a head according to the present invention comprises a cone 10 secured to the end of a sheath 12, having a series of tubes 11 branching off therefrom, one for each cable or strand, which tubes act as coatings therefor.
  • They serve for leading the strands to the sleeves 24, then to the connections formed of holes 21, which are provided in the front plate 20.
  • The series of holes 21 is arranged at such a position as to form a lattice of adjoining equilateral triangles, at the vertices of which said holes 21 are provided. Reinforcing ribs 23 are provided between the holes 21.
  • The periphery 22 of plate 20 is provided with mutual coupling members 25 and 26 securing one plate relative to the adjoining plates.. Further portions of this periphery 22 are shaped with projections 27 and recesses 28 which work as coupling members and placed in such a way as to be inserted between the sides of the various equilateral triangles, so that the arrangement of the strands of a plurality of adjoining plates always corresponds to the vertices of equilateral triangles, as shown in Fig. 4. Thus, in this figure it will be seen that the distance d between two holes 21 remains unaltered even if measured between two holes 21 pertaining to two adjoining plates 20.

Claims (3)

1. An anchoring head for cables or strands, wherein the front bearing plate (20) to the structure is provided with connections (21) for the strands which are arranged at the vertices of adjoining equilateral triangles characterized in that the periphery (22) of the front plate (20) has mutual coupling members (25, 26; 27, 28) at least partly shaped with projections (27) and recesses (28) of conjugate shape, whereby a plurality of plates (20) can be juxtaposed, so that also for adjoining plates the lattice arrangement of equilatral triangles remains unaltered.
2. A head according to claim 1, characterized in that at each connecting zone (21) of the strands or cables the front plate (20) is provided with a sleeve (24).
3. A head according to any of the preceding claims, characterized in that the front plate (20) is provided with ribs (23) extending between two connections (21) of the cables or strands.
EP81108474A 1980-10-22 1981-10-18 An anchoring head for strands or cables for tensioning metal or concrete structures Expired EP0050346B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2549780 1980-10-22
IT25497/80A IT1133979B (en) 1980-10-22 1980-10-22 ANCHORING HEAD FOR CABLE STRAPS OR CABLES SUITABLE TO STRESS METALLIC OR CONCRETE STRUCTURES

Publications (3)

Publication Number Publication Date
EP0050346A2 EP0050346A2 (en) 1982-04-28
EP0050346A3 EP0050346A3 (en) 1982-07-14
EP0050346B1 true EP0050346B1 (en) 1985-01-16

Family

ID=11216873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108474A Expired EP0050346B1 (en) 1980-10-22 1981-10-18 An anchoring head for strands or cables for tensioning metal or concrete structures

Country Status (3)

Country Link
EP (1) EP0050346B1 (en)
DE (1) DE3168371D1 (en)
IT (1) IT1133979B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4663907A (en) * 1985-06-26 1987-05-12 Manufacturas De Acero Y Caucho S.A. Anchorage for stressed reinforcing tendon
US7049345B2 (en) 2001-06-29 2006-05-23 Genzyme Corporation Fat-binding polymers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB864170A (en) * 1958-11-01 1961-03-29 Carves Simon Ltd Improvements in and relating to anchoring means for wire cables
GB1256359A (en) * 1968-11-26 1971-12-08 Michael Robert Johns Improvements in prestressed concrete structures
AU484438B2 (en) * 1974-04-24 1975-10-30 Triple Bee Prestress (Proprietary) Limited A device for anchoring or coupling cables

Also Published As

Publication number Publication date
EP0050346A2 (en) 1982-04-28
EP0050346A3 (en) 1982-07-14
IT8025497A0 (en) 1980-10-22
DE3168371D1 (en) 1985-02-28
IT1133979B (en) 1986-07-24

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