EP0248865B1 - Prestressing cable for precast concrete units - Google Patents

Prestressing cable for precast concrete units Download PDF

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Publication number
EP0248865B1
EP0248865B1 EP19870900151 EP87900151A EP0248865B1 EP 0248865 B1 EP0248865 B1 EP 0248865B1 EP 19870900151 EP19870900151 EP 19870900151 EP 87900151 A EP87900151 A EP 87900151A EP 0248865 B1 EP0248865 B1 EP 0248865B1
Authority
EP
European Patent Office
Prior art keywords
wires
core part
cable
outer wires
twisted around
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
EP19870900151
Other languages
German (de)
French (fr)
Other versions
EP0248865A1 (en
Inventor
Ilmari Paakkinen
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.)
Partek Oy AB
Original Assignee
Partek Oy AB
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 Partek Oy AB filed Critical Partek Oy AB
Priority to AT87900151T priority Critical patent/ATE51665T1/en
Publication of EP0248865A1 publication Critical patent/EP0248865A1/en
Application granted granted Critical
Publication of EP0248865B1 publication Critical patent/EP0248865B1/en
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
    • 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
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2029—Open winding
    • D07B2201/2031—Different twist pitch
    • D07B2201/2032—Different twist pitch compared with the core
    • 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
    • D07B2201/2061—Cores characterised by their structure comprising wires resulting in a twisted structure
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Ropes Or Cables (AREA)

Abstract

The cable consists of a core part and of outer wires (2) twisted around the core part. The core part consists of two wires (1) twisted around each other, the section of the said wires being based on a circle, or of one wire (3) twisted around its own axis and having a flattened section. The direction of twisting of the core part (1 or 3) is opposite to the direction of twisting of the outer wires (2).

Description

  • The present invention relates to a prestressing cable for precast concrete units, said cable comprising a core part and outer wires twisted around the core part, the core part comprising two wires twisted around each other, the section of the said wires being based on a circle, or one wire twisted around its own axis and having a flattened section.
  • In concrete structures, prestressing cables of steel are used and are subjected to a tensile strain before casting of the concrete structure. Most commonly the cable consists of six individual wires twisted around a core wire.
  • The object of the present invention is to improve the adherence of the cable to the concrete. The prestressing cable in accordance with the invention is characterized in that the direction of twisting of the core part is opposite to the direction of twisting of the outer wires.
  • On the face of the prestressing cable formed in this way, a network formed by projecting ridges is produced, wherein the screw lines of the outer wires run crosswise relative to the screw lines formed by the sides of the core part.
  • The invention will now be described by way of non-limiting embodiments with reference to the accompanying drawing, in which:-
    • Figure 1 shows a cross-section of the core part used in a cable of a first embodiment,
    • Figure 2 is a side view of the same core part,
    • Figure 3 shows a cross-section of the cable of the first embodiment,
    • Figure 4 is a side view of the same cable,
    • Figure 5 shows a cross-section of the core part used in a cable of a second embodiment,
    • Figure 6 is a side view of the same core part, and
    • Figure 7 is an axonometric view of a cable of a further embodiment, as cut into three parts.
  • The core part of the cable in accordance with the first embodiment of the invention consists of two wires 1 whose section is circular (Figures 1 to 4). These two wires are twisted around each other.
  • According to Figure 2, the twisting of the core part is right-handed, i.e. S-spiral.
  • Around the core part, six outer wires 2 have been twisted, whose section is also circular and whose diameter is about 1s times the diameter of the wires 1 in the core part (Figures 3 and 4). The direction of twisting of the outer wires is opposite to the direction of twisting of the wires in the core part. According to Figure 4, the direction of twisting of the outer wires is left-handed, i.e. Z-spiral. Moreover, the pitch of the spiral of the outer wires is considerably higher than the pitch of the spiral of the core part. This means that, within a certain length of cable, the number of windings of the core part is clearly higher than the number of windings of the outer wires.
  • Figures 5 and 6 show an alternative embodiment of a core part. The core part consists of a flattened wire 3, which is twisted around its own axis. The direction and the pitch of the spiral are similar to those in the core part shown in Figures 1 and 2. The dimensioning of the section of the core wire is most appropriately such that its largest diameter is equal to the diameter of the outer wires 2, whereas the smallest diameter, perpendicular to the largest diameter, is one half of the largest diameter.
  • The invention is not confined to the embodiments described above. The number of outer wires may be different from six. For example, four wires is enough, depending on the ratio of the diameter of the outer wires to the section of the core part. In Figure 7 an embodiment is shown in which the diameter of the outer wires is equal to the diameter of the two wires in the core part, and the number of the outer wires is eight. The figure shows three adjoining sections at intervals of 1/8 of the pitch. The pitch of the spirals of the core wires and of the outer wires is the same. The core wires are denoted with letter symbols a, b, and some of the outer wires are denoted with letter symbols e to h, whereby the effect of opposite twisting directions is seen clearly.
  • The outer face of the wires may be smooth, or the wire faces may be provided with projections or recesses to improve the adherence.

Claims (4)

1. Prestressing cable for precast concrete units, said cable comprising a core part and outer wires (2) twisted around the core part, the core part comprising two wires (1) twisted around each other, the section of the said wires (1) being based on a circle, or one wire (3) twisted around its own axis and having a flattened section, characterized in that the direction of twisting of the core part (1 or 3) is opposite to the direction of twisting of the outer wires (2).
2. Prestressing cable as claimed in claim 1, wherein the ratio of the pitch of the spiral of the core part (1 or 3) to the pitch of the spiral of the outer wires is within the range from 2 to 0.3.
3. Prestressing cable as claimed in claim 1 or claim 2, wherein the faces of the outer wires (2) are smooth or profiled.
4. Prestressing cable as claimed in any one of claims 1 to 3, wherein the diameter of the outer wires (2) is substantially equal to the diameter of the two core wires (1), and the number of the outer wires (2) is eight.
EP19870900151 1985-11-27 1986-12-10 Prestressing cable for precast concrete units Expired EP0248865B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87900151T ATE51665T1 (en) 1985-11-27 1986-12-10 PRESTRESSED CABLES FOR PRESTRESSED CONCRETE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI854697A FI73039C (en) 1985-11-27 1985-11-27 Pre-tensioning cable for concrete elements. Siirretty päivämäärä-Offset date PL 14
FI854697 1985-12-11

Publications (2)

Publication Number Publication Date
EP0248865A1 EP0248865A1 (en) 1987-12-16
EP0248865B1 true EP0248865B1 (en) 1990-04-04

Family

ID=8521751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900151 Expired EP0248865B1 (en) 1985-11-27 1986-12-10 Prestressing cable for precast concrete units

Country Status (11)

Country Link
EP (1) EP0248865B1 (en)
JP (1) JPS63502843A (en)
AU (1) AU6779887A (en)
DD (1) DD254755A5 (en)
DE (1) DE3670118D1 (en)
FI (1) FI73039C (en)
GR (1) GR862888B (en)
HU (1) HU205417B (en)
NZ (1) NZ218599A (en)
PT (1) PT83912B (en)
WO (1) WO1987003636A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0723591B2 (en) * 1988-12-07 1995-03-15 株式会社ブリヂストン Steel cord and pneumatic radial tire for reinforcing rubber articles
WO1993001375A1 (en) * 1991-07-09 1993-01-21 Severo-Kavkazsky Territorialny Kooperativno-Gosudarstvenny Nauchno-Issledovatelsky I Proektny Institut Agropromyshlennogo Komplexa Reinforcement rope

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US952161A (en) * 1906-11-01 1910-03-15 George S Whyte Non-rotating wire rope.
IT634880A (en) * 1959-08-11
BE654920A (en) * 1964-10-28 1965-02-15
SE340875B (en) * 1970-03-12 1971-12-06 Straengbetong Ab
GB1311914A (en) * 1970-09-05 1973-03-28 Kobe Steel Ltd Steel cord
US3996733A (en) * 1976-01-27 1976-12-14 Uniroyal Inc. Reinforcing cord construction
DE2755667A1 (en) * 1977-12-14 1979-06-21 Continental Gummi Werke Ag Pneumatic tyre reinforcing steel cables - with core strand surrounded by five strands without mutual contact and having same pitch as core but opposite hand

Also Published As

Publication number Publication date
WO1987003636A1 (en) 1987-06-18
FI854697A0 (en) 1985-11-27
HU205417B (en) 1992-04-28
PT83912B (en) 1989-01-03
EP0248865A1 (en) 1987-12-16
AU6779887A (en) 1987-06-30
DD254755A5 (en) 1988-03-09
FI73039C (en) 1987-08-10
DE3670118D1 (en) 1990-05-10
JPS63502843A (en) 1988-10-20
HUT44304A (en) 1988-02-29
GR862888B (en) 1987-04-08
FI73039B (en) 1987-04-30
NZ218599A (en) 1989-07-27
PT83912A (en) 1987-01-01

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