EP0078564B1 - Câble de précontrainte pour structures de béton et structures de béton comprenant un tel câble - Google Patents

Câble de précontrainte pour structures de béton et structures de béton comprenant un tel câble Download PDF

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Publication number
EP0078564B1
EP0078564B1 EP82201303A EP82201303A EP0078564B1 EP 0078564 B1 EP0078564 B1 EP 0078564B1 EP 82201303 A EP82201303 A EP 82201303A EP 82201303 A EP82201303 A EP 82201303A EP 0078564 B1 EP0078564 B1 EP 0078564B1
Authority
EP
European Patent Office
Prior art keywords
core wire
wire
strand
treatment
outer 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
Application number
EP82201303A
Other languages
German (de)
English (en)
Other versions
EP0078564A3 (en
EP0078564A2 (fr
Inventor
Karl Gustav Bernander
Bruno Hauzenberger
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.)
Estel Nederlandse Draadindustrie Bv
Original Assignee
Estel Nederlandse Draadindustrie Bv
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 Estel Nederlandse Draadindustrie Bv filed Critical Estel Nederlandse Draadindustrie Bv
Priority to AT82201303T priority Critical patent/ATE28913T1/de
Publication of EP0078564A2 publication Critical patent/EP0078564A2/fr
Publication of EP0078564A3 publication Critical patent/EP0078564A3/en
Application granted granted Critical
Publication of EP0078564B1 publication Critical patent/EP0078564B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0693—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a strand configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B5/00—Making ropes or cables from special materials or of particular form
    • D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
    • 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
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2059—Cores characterised by their structure comprising wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2065—Cores characterised by their structure comprising a coating
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/205—Avoiding relative movement of components
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2015—Construction industries
    • D07B2501/2023—Concrete enforcements

Definitions

  • the invention relates to a prestressing strand for post-tensioning a concrete structure, having at least one central core wire and a plurality of outer wires extending helically around the said core wire so as to envelop the core wire.
  • Such strands are often used as the tensioned reinforcing elements in prestressed concrete structures, in which they may for example be inserted in curved conduits in the concrete structure.
  • the conduits are formed for example by tubes of steel or another material, which are pre-cast into the concrete structure.
  • the invention also relates to a process of manufacturing such strand and to a concrete structure containing such strand.
  • the core wire should be some 5 to 7% larger in diameter than the outer wires. According to Techniques de I' 1976 this slightly larger diameter of the core wire is necessary to ensure that movement of the core wire relative to the outer wires is possible during the tensioning of the strand.
  • the invention arrived after extensive trials to a different insight with respect to the construction of the strand at the process of manufacturing such a strand, which will be explained in the following.
  • the present invention arises because, for prestressing strand, investigations do not appear to have resulted in the most suitable practical strand construction for use in post-tensioning.
  • the tension condition and the deformation condition of a prestressing strand in a curved configuration, in which the strand is subjected to transverse forces and frictional forces, is highly complex, and is dependent on a great number of factors which are related to the properties of the material and the production methods for the strand.
  • the object of the present invention is therefore to make it possible to control and minimize variations in tension in prestressing strand in curved conduits.
  • the inventors have realised that a considerably better consistency between the modulus of deformation and the modulus of elasticity can be obtained when the core wire can be more adequately tensioned over its whole length and can cooperate better as a load bearing element.
  • One treatment method for the core is to form mechanically identations in the core wire surface.
  • Another treatment method is to only modify the surface condition of the core wire so as to increase the coefficient of friction between the core wire and the outer wires.
  • This frictional properties instead of accepting undesired variations in the frictional properties inside the strand, use is made of these frictional properties, by increasing this friction in order to reduce or even prevent any movement in longitudinal direction between the core wire and the outer wires.
  • the surface condition of the wire can be adequately modified by subjecting it to a chemical etching treatment.
  • Chemical etching treatments of steel products are generally known, which means that no further explanation needs to be given how such etching is to be performed in order to achieve a slight roughening of the surface, without unduly affecting the physical properties of the material.
  • the object of the present invention may be obtained, without modifying the wire itself, if a resin coating in which an abrasive powder, e.g. a grinding powder such as carborundum, is admixed is applied to the wire.
  • an abrasive powder e.g. a grinding powder such as carborundum
  • the particles of the grinding power prevent or at least reduce movement between the various wires.
  • wire treatment consists in depositing a friction-increasing substance upon the wire by an electrochemical or an electrostatic process.
  • electrochemical or an electrostatic process there are many options available to the expert for achieving suitable deposition.
  • the invention also relates to the process of manufacture of the prestressing strand and to a concrete structure containing one or more tensioned strands according to the invention, as described above.
  • the manufacturing steps start from wire of surface condition hitherto conventional in this field, e.g. as supplied by wire manufacturers.
  • Figs. 1 and 2 of the accompanying drawings show a prestressing strand having a single core wire b and six outer wires a in longitudinal view and in cross section respectively.
  • Fig. 1 also indicates the pitch of the helices in which each of the outer wires lies. For the whole strand, this pitch S is referred to herein by the expression "helical pitch length”.
  • Fig. 2 indicates the greatest cross sectional dimension which is herein called the maximum diameter of the strand. It is usual to express the helical pitch length as a multiple of the strand diameter. For prestressing strands, this length S generally lies between 12 and 18 times the diameter, although a value of S in this range is not essential for the present invention.
  • Figs. 3 and 4 show a concrete plate 1 with a thickness of 22 cm. Through this plate 1 there extends a conduit 3 which over an angle of 5.07 radians is curved with a radius of curvature R of 100 cm. The length L 2 of the curved conduit part is consequently 507 cm. Across each end of the conduit 3 there is located a support beam 2 with at the left hand side a wedge anchoring 5 for a prestressing strand and at the right hand side a similar wedge anchoring 5 behind a hydraulic press 4 (schematically shown).
  • the tensioned strand then consists of a straight section of length L, of 175 cm, a curved section of length L 2 of 507 cm and another straight section of length L 3 of 210 cm.
  • Tests were carried out using the most common prestressing strand of thickness D of 0.5 inches, and having a core wire and six outer wires.
  • the strand was brought under nominal tension, in order to stretch it sufficiently, whereupon the tension force was increased up to a value near the usual full load value used in tensioning technology. During the increase of the tension force, the elongation and the tension force in the strand were measured continuously.
  • the strand was considered to be divided into elements, and for each element the stress and strain conditions were calculated with the application of a frictional force between the channel wall and the prestressing strand.
  • frictional coefficients between the strand and the channel wall at various tension forces in the strand were determined. Per element, these friction coefficients were introduced into the calculation so that it was possible to determine by calculation, what tension forces should be present in the strand, on the basis of the total measured extension of the strand between the anchors 5. The value was compared with the actual tension forces obtained, from which a value could be obtained for the modulus of deformation in each test performed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Paper (AREA)
  • Reinforced Plastic Materials (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Rod-Shaped Construction Members (AREA)

Claims (10)

1. Câble de précontrainte prévu pour postcon- traindre un ouvrage en béton, comportant au moins une âme centrale (b) et une pluralité de fils extérieurs (1) s'enroulant hélicoïdalement autour de cette âme centrale afin de l'envelopper, caractérisé en ce que seule l'âme (b) a été soumise à un traitement qui modifie sa surface de telle manière que, en conséquence de ce traitement, la résistance au déplacement longitudinal de l'âme (b) par rapport aux fils extérieurs (a) est plus grande que si le traitement n'avait pas été effectué.
2. Câble de précontrainte suivant la revendication 1, dans lequel ce traitement de l'âme (b) comprend la formation mécanique d'empreintes dans la surface de l'âme.
3. Câble de précontrainte suivant la revendication 1, dans lequel ce traitement de l'âme (b) comprend la modification de l'état de surface afin d'augmenter le coefficient de frottement entre l'âme (b) et les fils extérieurs (a).
4. Câble de précontrainte suivant la revendication 3, dans lequel ce traitement est au moins l'un des suivants:
a) création d'une mince couche d'oxyde par chauffage du fil dans une atmosphère oxydante;
b) attaque chimique du fil;
c) application sur le fil d'un revêtement résineux contenant une poudre abrasive;
d) dépôt sur la surface du fil d'une substance qui augmente le frottement.
5. Ouvrage en béton contenant au moins un câble de précontrainte postcontraint dans une canalisation suivant l'une des revendications 1 à 4.
6. Ouvrage en béton suivant la revendication 5, dans lequel ce câble postcontraint se prolonge le long d'une canalisation courbe prévue à l'intérieur de l'ovrage en béton.
7. Procédé de fabrication d'un câble de précontrainte suivant la revendication 1, comprenant la fourniture d'au moins une âme centrale et d'une pluralité de fils extérieurs et l'enroulement hélicoïdal de ces fils extérieurs autour de l'âme de manière à l'envelopper, caractérisé en ce que, préalablement au stade d'enveloppement, le procédé comprend en outre l'application à l'âme seule d'un traitement de manière à lui donner une surface modifiée telle qu'à la suite de ce traitement, la résistance au déplacement longitudinal de l'ame par rapport aux fils extérieurs est plus grande que si ce traitement n'avait pas été effectué.
8. Procédé suivant la revendication 7, dans lequel ce traitement de l'âme comprend la formation mécanique d'empreintes dans la surface de l'âme.
9. Procédé suivant la revendication 7, dans lequel ce traitement de l'âme comprend la modification de l'état de surface du fil de manière à augmenter le coefficient de frottement entre l'âme et les fils extérieurs.
10. Procédé suivant la revendication 9, dans lequel le traitement effectué pour augmenter le coefficient de frottement comprend au moins l'un des stades suivants:
a) formation d'une mince couche d'oxyde par chauffage du fil dans une atmosphère oxydante;
b) attaque chimique de la surface du fil;
c) application sur le fil d'un revêtement résineux contenant une poudre abrasive;
d) dépôt sur la surface du fil d'une substance qui augmente le frottement.
EP82201303A 1981-11-02 1982-10-20 Câble de précontrainte pour structures de béton et structures de béton comprenant un tel câble Expired EP0078564B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82201303T ATE28913T1 (de) 1981-11-02 1982-10-20 Vorspannkabel fuer betonkonstruktionen und betonkonstruktionen mit solchem kabel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6966/81 1981-11-02
CH696681 1981-11-02

Publications (3)

Publication Number Publication Date
EP0078564A2 EP0078564A2 (fr) 1983-05-11
EP0078564A3 EP0078564A3 (en) 1984-05-23
EP0078564B1 true EP0078564B1 (fr) 1987-08-12

Family

ID=4317835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82201303A Expired EP0078564B1 (fr) 1981-11-02 1982-10-20 Câble de précontrainte pour structures de béton et structures de béton comprenant un tel câble

Country Status (6)

Country Link
EP (1) EP0078564B1 (fr)
AT (1) ATE28913T1 (fr)
DE (1) DE3276952D1 (fr)
ES (2) ES516971A0 (fr)
FI (1) FI72370C (fr)
NO (1) NO165122C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1228998A (fr) * 1982-10-28 1987-11-10 Frederick F. Hunt Cables d'acier a resistance a la corrosion et caracteristiques d'adherence ameliorees, destines surtout a la precontrainte du beton
JP5172028B1 (ja) * 2012-04-12 2013-03-27 黒沢建設株式会社 二重防錆ｐｃ鋼より線

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131469A (en) * 1960-03-21 1964-05-05 Tyler Wayne Res Corp Process of producing a unitary multiple wire strand
NL6506030A (fr) * 1964-05-19 1965-11-22
DE1525129C3 (de) * 1965-01-02 1975-01-30 Intercontinentale-Technik Gesellschaft Fuer Planung Und Konstruktion Mbh, 8000 Muenchen Bündel aus hochfesten metallischen Längselementen
FR1586725A (fr) * 1967-10-04 1970-02-27
US3755003A (en) * 1970-07-24 1973-08-28 Diamond Shamrock Corp Method of preparing and using concrete reinforcing elements

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HÜTTE, Bautechnik vol.1, page 726, *
Techniques de l'Ingénieur, pages C-360-5 and 6 *

Also Published As

Publication number Publication date
DE3276952D1 (en) 1987-09-17
FI823701L (fi) 1983-05-03
NO165122B (no) 1990-09-17
FI72370B (fi) 1987-01-30
EP0078564A3 (en) 1984-05-23
ES271531U (es) 1983-10-16
EP0078564A2 (fr) 1983-05-11
ES8500372A1 (es) 1984-10-01
NO823616L (no) 1983-05-03
FI823701A0 (fi) 1982-10-29
ES516971A0 (es) 1984-10-01
FI72370C (fi) 1987-05-11
ATE28913T1 (de) 1987-08-15
NO165122C (no) 1990-12-27

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