WO1987003636A1 - Prestressing cable for precast concrete units - Google Patents

Prestressing cable for precast concrete units Download PDF

Info

Publication number
WO1987003636A1
WO1987003636A1 PCT/FI1986/000145 FI8600145W WO8703636A1 WO 1987003636 A1 WO1987003636 A1 WO 1987003636A1 FI 8600145 W FI8600145 W FI 8600145W WO 8703636 A1 WO8703636 A1 WO 8703636A1
Authority
WO
WIPO (PCT)
Prior art keywords
wires
core part
cable
outer wires
twisted around
Prior art date
Application number
PCT/FI1986/000145
Other languages
French (fr)
Inventor
Ilmari Paakkinen
Original Assignee
Oy Partek 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 Oy Partek Ab filed Critical Oy Partek Ab
Priority to DE8787900151T priority Critical patent/DE3670118D1/en
Priority to HU87436D priority patent/HU205417B/en
Priority to AT87900151T priority patent/ATE51665T1/en
Publication of WO1987003636A1 publication Critical patent/WO1987003636A1/en

Links

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

Definitions

  • the present invention concerns a prestressing cable for precast concrete units, which said cable con- sists of a core part and of outer wires twisted around the core part, whereat the core part consists of two wires twisted around each other, the section of the said wires being based on a circle, or of one wire twisted around its own axis and having a flattened section.
  • prestressing cables of steel are used, which 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 im ⁇ prove 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 "che outer wires.
  • Figure 1 shows a cross-section of the core part used in a cable of one embodiment.
  • Figure 2 is a side view of the same core part.
  • Figure 3 shows a cross section of a cable of one 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
  • Figure 7 is an axonometric view of a cable of a further embodiment, as cut into three parts.
  • the core part in the cable in accordance with the invention may consist of two wires 1 , whose section is circular ( Figures 1 to 4) . These two wires are twisted around each other. According to Fig. 2, the twisting of the core part is right-handed, i.e. S-spiral.
  • outer wires 2 Around the core part, six outer wires 2 have been twisted, whose section is also circular and whose diameter is about 1 _ 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 Fig. 4, the direction of twisting of the outer wires is left-handed, i.e. Z-spiral.
  • 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 embodi ⁇ ment 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 embodiment described above only, but it may show variation in differ ⁇ ent ways within the scope of the patent claims.
  • the number of outer wires may also 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.
  • Fig. 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 imorove the adherence.

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

Prestressing cable for precast concrete units
The present invention concerns a prestressing cable for precast concrete units, which said cable con- sists of a core part and of outer wires twisted around the core part, whereat the core part consists of two wires twisted around each other, the section of the said wires being based on a circle, or of one wire twisted around its own axis and having a flattened section. In concrete structures, prestressing cables of steel are used, which 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 im¬ prove 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 "che 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 the screw lines formed by the sides of the core part.
The invention and its details will be described in more detail in the following with reference to the accompanying drawing, wherein
Figure 1 shows a cross-section of the core part used in a cable of one embodiment.
Figure 2 is a side view of the same core part.
Figure 3 shows a cross section of a cable of one 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 in the cable in accordance with the invention may consist of two wires 1 , whose section is circular (Figures 1 to 4) . These two wires are twisted around each other. According to Fig. 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 1 _ 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 Fig. 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 embodi¬ ment 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 embodiment described above only, but it may show variation in differ¬ ent ways within the scope of the patent claims. The number of outer wires may also 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 Fig. 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 imorove the adherence.

Claims

WHAT IS CLAIMED IS:
1. Prestressing cable for precast concrete units, which said cable consists of a core part and of outer wires (2) twisted around the core part, whereat 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, c h a r a c t e r - i z e d 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, c h a r a c t e r i z e d in that 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 between 2 and 0.3.
3. Prestressing cable as claimed in claim 1 or 2, c h a r a c t e r i z e d in that the faces of the outer wires (2) are smooth or profiled in a way known in prior art.
4. Prestressing cable as claimed in any of the claims 1 to 3, c h a r a c t e r i z e d in that the diameter of the outer wires (2) is substantially equal to the diameter of the two core wires (1 ) , in which case the number of the outer wires is eight.
PCT/FI1986/000145 1985-11-27 1986-12-10 Prestressing cable for precast concrete units WO1987003636A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8787900151T DE3670118D1 (en) 1985-11-27 1986-12-10 PRELOADED CABLES FOR CONCRETE CONCRETE.
HU87436D HU205417B (en) 1985-11-27 1986-12-10 Prestressing cable for cast concrete members
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
FI854697 1985-11-27
FI854697A FI73039C (en) 1985-11-27 1985-11-27 Pre-tensioning cable for concrete elements. Siirretty päivämäärä-Offset date PL 14

Publications (1)

Publication Number Publication Date
WO1987003636A1 true WO1987003636A1 (en) 1987-06-18

Family

ID=8521751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1986/000145 WO1987003636A1 (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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993001375A1 (en) * 1991-07-09 1993-01-21 Severo-Kavkazsky Territorialny Kooperativno-Gosudarstvenny Nauchno-Issledovatelsky I Proektny Institut Agropromyshlennogo Komplexa Reinforcement rope

Families Citing this family (1)

* 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

Citations (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.
US3032963A (en) * 1959-08-11 1962-05-08 United States Steel Corp Cord and article containing the same
US3336744A (en) * 1964-10-28 1967-08-22 Trefileries Leon Bekaert S P R Reinforcing cord having two-filament core surrounded by six single filatment units
SE340875B (en) * 1970-03-12 1971-12-06 Straengbetong Ab
US3726078A (en) * 1970-09-05 1973-04-10 Kobe Steel Ltd Steel cord and article including the same
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

Patent Citations (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.
US3032963A (en) * 1959-08-11 1962-05-08 United States Steel Corp Cord and article containing the same
US3336744A (en) * 1964-10-28 1967-08-22 Trefileries Leon Bekaert S P R Reinforcing cord having two-filament core surrounded by six single filatment units
SE340875B (en) * 1970-03-12 1971-12-06 Straengbetong Ab
US3726078A (en) * 1970-09-05 1973-04-10 Kobe Steel Ltd Steel cord and article including the same
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993001375A1 (en) * 1991-07-09 1993-01-21 Severo-Kavkazsky Territorialny Kooperativno-Gosudarstvenny Nauchno-Issledovatelsky I Proektny Institut Agropromyshlennogo Komplexa Reinforcement rope

Also Published As

Publication number Publication date
PT83912B (en) 1989-01-03
AU6779887A (en) 1987-06-30
GR862888B (en) 1987-04-08
FI73039B (en) 1987-04-30
FI854697A0 (en) 1985-11-27
EP0248865B1 (en) 1990-04-04
DE3670118D1 (en) 1990-05-10
NZ218599A (en) 1989-07-27
JPS63502843A (en) 1988-10-20
HUT44304A (en) 1988-02-29
HU205417B (en) 1992-04-28
EP0248865A1 (en) 1987-12-16
DD254755A5 (en) 1988-03-09
FI73039C (en) 1987-08-10
PT83912A (en) 1987-01-01

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