EP0247130B1 - Strand for stressed concrete structure and process for its production - Google Patents

Strand for stressed concrete structure and process for its production Download PDF

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Publication number
EP0247130B1
EP0247130B1 EP86906911A EP86906911A EP0247130B1 EP 0247130 B1 EP0247130 B1 EP 0247130B1 EP 86906911 A EP86906911 A EP 86906911A EP 86906911 A EP86906911 A EP 86906911A EP 0247130 B1 EP0247130 B1 EP 0247130B1
Authority
EP
European Patent Office
Prior art keywords
strand
wires
section
cross
wire
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 - Lifetime
Application number
EP86906911A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0247130A1 (en
Inventor
Ottó LAKATOS
Lajos Madarasz
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.)
'december 4' Drotmuevek
Original Assignee
'december 4' Drotmuevek
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 'december 4' Drotmuevek filed Critical 'december 4' Drotmuevek
Priority to AT86906911T priority Critical patent/ATE72282T1/de
Publication of EP0247130A1 publication Critical patent/EP0247130A1/en
Application granted granted Critical
Publication of EP0247130B1 publication Critical patent/EP0247130B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D07B1/08—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core the layers of which are formed of profiled interlocking wires, i.e. the strands forming concentric layers
    • 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

Definitions

  • the invention relates to a stressed concrete structure strand comprising at least three wires twisted together and to a method for producing a stressed concrete structure strand wherein a first cross-section of individual wires is formed and then at least three wires are twisted to form a strand.
  • strands are used for pre-stressed, or after-stressed (reinforced) concrete structures to take up the stretching force. These are formed generally with three to seven pieces of 2 to 5 mm thick cold drawn individual steel wires, so-called “elementary filaments” to cable-type strand with the use of twisting (stranding) machine. These strands transmit the stretching force to the concrete structure through adhesion, or anchorage between the strand and the concrete.
  • Such strands and cables are already known from the British patent specification No. 1 194 758 and GFR patent specification No. 1 659 265, where evenly distributed (periodic) profiling of small depth is produced by rolling after cold drawing on the surface of the covering wires of the strand, just as in case of the simple concrete reinforcing rods.
  • the adhesive capacity of the strand in the concrete is improved by the periodic profiling formed with such indentation, i.e. "the anchoring length" will be shorter, however the increased risk of cracking or breakage must be reckoned with in the elementary filaments at the corners of the indentations upon the bending and torsional stresses arising during loading of the strand.
  • the arrangement of the periodic surface profiles within the strand is incidental, in other words, the "functional" cross section surfaces of the sections perpendicular to the longitudinal axis of the strand are different from each other, consequently the stress conditions arising during loading are also different. This implies that the possibly smallest cross section is to be reckoned with for strength calculation of the strand, which however is unfavourable in respect of the steel utilization.
  • DE-A-2 416 633 discloses reinforcement strands made from rods or strips for normal unstressed concrete structures. However, said strands cannot be stressed because they do not go through the whole concrete element.
  • the length to diameter ratio is preferably between 70 and 160. With a diameter of 0,35 mm, the length will be between 2,50 cm and 5,6 cm. Even if the strands were long enough for use unstressed concrete the suggested tensile strength range of 830 N/mm2 to 1370 N/mm2 is inadequate for stressed concrete.
  • the round wires of said document are fixed together by a binder and are arranged uniplanar.
  • the object is solved in that all the wires forming the strand have the same non-circular cross-section along their whole length.
  • the object is also solved by a method for producing a stressed concrete structure strand, wherein a first cross-section of individual wires is formed and then at least three wires are twisted to form a strand by forming all the individual wires with the same cross-section as a uniform non-circular one along their length by cold drawing the wire through a drawplate.
  • Such strand which has a twist formed with at least three wires provided with surface profiling.
  • the cross section profile of the wires continuously passing through in longitudinal direction may suitably be a polygonal profile, preferably a rounded regular hexagon. This enables a very simple production.
  • cross section profile of the wires continuously passing through in longitudinal direction is formed as such circular or polygonal cross section, which is provided with longitudinal groove-like recesses and/or rib-like extensions evenly distributed along the circumference.
  • the starting point was such conventional method where first the surface profiling of the wires is formed with cold deformation, then at least three wires are formed to strand with simultaneous twisting.
  • the essence of the process according to the invention is that the surface profiling of the wires is formed by drawing through drawplate of non-circular, preferably rounded hexagonal cross section.
  • the wires it is advisable to form the wires by turning around their longitudinal axis during or after formation of the profile, but before twisting. It is expedient if the turning direction of the wires coincides with the subsequent twisting direction of the strand. Furthermore, it is preferable if the pitch of the twisting is selected to the multiple, suitably at least to tenfold of the pitch of wire-turning.
  • the invention is described in detail with the aid of drawing, showing the cross section of the strand according to the invention given by way of example, and drawn to enlarged scale.
  • the strand denoted with reference number 1 in this case consists of a central wire 2, (i.e. "supporting core wire") and tangentially surrounding six covering wires 3.
  • the covering wires 3 in contact with the concrete in built-in state and the cover wire 2 have non-cirucular cross section profile continuously passing through in longitudinal direction for the purpose of increased adhesion to the concrete, and establishing indentical stress conditions in all strand cross sections.
  • the covering wires 3 are of regular hexagonal cross section, rounded on the corners.
  • the diameter of the circle drawable into the hexagon in case of the cover wire is marked with D3
  • diameter of the circle drawable around the hexagon with D ' 3
  • the embracing face-distance of strand 1 with L1 while its distance between centres is marked with L2.
  • the diameter of the central wire 2 is greater by 3-4 % than the diameter D ' 3 of the covering wires 3 for better seating of the covering wires 3.
  • the diameter of central wire 2 was selected to 4.26 mm, and the diameter D ' 3 of the covering wires 3 to 4.11 mm.
  • the covering wires 3 are shown in ideal state in the drawing, where the hexangonal faces of the adjacent wires 3 bear up on each other. In the reality this rarely occurs.
  • Production of the strand 1 according to the invention is the following:
  • the production technology of the central wire 2 and covering wires 3 is essentially conventional.
  • the covering wire 3 is turned around its longitudinal axis (naturally this can be dispensed with in given case) while passing through the drawplate.
  • the pitch of wire-turning is determined by the pitch of the drawplate.
  • the drawplate was embedded as to be capable to turn around the advanced wire.
  • the twist i.e. the strand 1 is formed on a conventional twisting machine with the central wire 2 and six covering wires 3.
  • the turning direction of the covering wires 3 was selected to be identical with the direction of twisting, furthermore the pitch of twisting was selected to about tenfold of the turning pitch.
  • any cross section of the strand is identical, consequently the arising stress conditions too are identical.
  • the surface area increased according to the periodic profiling results in improved anchoring capacity of the strand 1, consequently the load bearing capacity of the strand 1 and its safety factor are also increased.
  • the use of steel, i.e. material is less for the strand provided with covering wires of helical hexagon cross section according to the invention.
  • the central wire 2 is omitted.
  • the central wire may be identical with the covering wires.
  • any other non-circular profile can also be used with similar result, e.g. as polygonal cross sections, thus regular pentagon, octogon, etc.
  • such circular or polygonal profile too may come into question at least for the covering wires, which is provided with groovelike recesses passing through in longitudinal direction, and/or rib-like, or web-like extensions passing through in longitudinal direction.
  • the cold deformation of the three latter ones may be accomplished in any other way, e.g. by rolling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Ropes Or Cables (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Sewage (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Heat Treatment Of Steel (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Disintegrating Or Milling (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
EP86906911A 1985-11-26 1986-11-18 Strand for stressed concrete structure and process for its production Expired - Lifetime EP0247130B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86906911T ATE72282T1 (de) 1985-11-26 1986-11-18 Spannstahl fuer spannbeton und methode zu seiner herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU451185 1985-11-26
HU854511A HU204312B (en) 1985-11-26 1985-11-26 Stretching staple for stressed concrete structures

Publications (2)

Publication Number Publication Date
EP0247130A1 EP0247130A1 (en) 1987-12-02
EP0247130B1 true EP0247130B1 (en) 1992-01-29

Family

ID=10968173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86906911A Expired - Lifetime EP0247130B1 (en) 1985-11-26 1986-11-18 Strand for stressed concrete structure and process for its production

Country Status (9)

Country Link
EP (1) EP0247130B1 (cs)
AT (1) ATE72282T1 (cs)
CS (1) CS274284B2 (cs)
DD (1) DD259228A1 (cs)
DE (1) DE3683769D1 (cs)
FI (1) FI873196L (cs)
HU (1) HU204312B (cs)
NO (1) NO873118L (cs)
WO (1) WO1987003322A1 (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1015295A3 (fr) * 2003-01-08 2005-01-11 Fontainunion S A Element de renforcement pour beton.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL91771C (cs) * 1953-11-07 1900-01-01
IL32159A (en) * 1968-10-30 1973-06-29 Ivanier I Cold drawn ribbed metal wire products;apparatus and process for the production thereof
US3735625A (en) * 1970-07-28 1973-05-29 Naniwa Seitel Co Ltd Apparatus for producing helical wires, rods, bars and the like
NL173433C (cs) * 1973-04-16 Bekaert Sa Nv
PL110940B1 (en) * 1976-12-01 1980-08-30 Zaklady Hutniczo Przetworcze M Method of manufacturing rods of hexagonal cross-sectionand drawing die for manufacturing rods of hexagonal cross-section
GB2011299B (en) * 1977-12-30 1982-04-21 Barnabo Steel Corp Cold die for drawing polygonal shapes

Also Published As

Publication number Publication date
CS274284B2 (en) 1991-04-11
FI873196A0 (fi) 1987-07-20
EP0247130A1 (en) 1987-12-02
NO873118L (no) 1987-09-22
WO1987003322A1 (en) 1987-06-04
CS864786A2 (en) 1990-09-12
HUT43362A (en) 1987-10-28
NO873118D0 (no) 1987-07-24
FI873196A7 (fi) 1987-07-20
ATE72282T1 (de) 1992-02-15
HU204312B (en) 1991-12-30
DD259228A1 (de) 1988-08-17
DE3683769D1 (de) 1992-03-12
FI873196L (fi) 1987-07-20

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