EP0298524A2 - Matériau précontraint en acier - Google Patents

Matériau précontraint en acier Download PDF

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Publication number
EP0298524A2
EP0298524A2 EP88111961A EP88111961A EP0298524A2 EP 0298524 A2 EP0298524 A2 EP 0298524A2 EP 88111961 A EP88111961 A EP 88111961A EP 88111961 A EP88111961 A EP 88111961A EP 0298524 A2 EP0298524 A2 EP 0298524A2
Authority
EP
European Patent Office
Prior art keywords
steel
heat
steel material
resin tube
tube
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.)
Granted
Application number
EP88111961A
Other languages
German (de)
English (en)
Other versions
EP0298524B1 (fr
EP0298524A3 (en
Inventor
Kanji C/O Itami Works Of Sumitomo Electr Wanatabe
Mikio C/O Itami Works Of Sumitomo Electr. Mizoe
Eiji C/O Itami Works Of Sumitomo Electr. Inoo
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
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
Priority claimed from JP1983194474U external-priority patent/JPS60102327U/ja
Priority claimed from JP1983194473U external-priority patent/JPS60102326U/ja
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0298524A2 publication Critical patent/EP0298524A2/fr
Publication of EP0298524A3 publication Critical patent/EP0298524A3/en
Application granted granted Critical
Publication of EP0298524B1 publication Critical patent/EP0298524B1/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
    • D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
    • D07B1/162—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber enveloping sheathing
    • 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
    • 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 relates to steel materials for use with concrete that is prestressed by posttensioning.
  • Concrete has a relatively low tensile strength.
  • prestressed concrete has been developed. By means of high strength steel wires, bars or strands, a concrete member is precompressed. When the structure receives a load, the compression is relieved on that portion which would normally be in tension.
  • the present invention relates to steel materials for use with concrete of the type that is prestressed by posttensioning.
  • Figs. 1 and 2 Structural designs used to prevent direct contact between steel materials and the surrounding prestressed concrete are illustrated in Figs. 1 and 2.
  • the design shown in Fig. 1 can be used whether the steel material is in the form of a wire, bar or strand.
  • a steel member 1 having a grease coating 2 is sheathed with a PE (polyethylene) tube 3.
  • PE polyethylene
  • the lubricating effect of the intermediate grease coating 2 reduces the coefficient of friction between the steel member and concrete to as low as between 0.002 and 0.005 m-'. Because of this low coefficient of friction, the design in Fig. 1 provides great ease in posttensioning a long steel cable in concrete.
  • the need for preventing grease leakage from either end of the PE tube presents great difficulty in fabricating and handling the steel material.
  • steel members having screws or heads at both ends are difficult to produce in a continuous fashion.
  • the steel member 1 shown in Fig. 2 which is encapsulated in asphalt 5, has a slightly greater coefficient of friction than the structure shown in Fig. 1.
  • This design is extensively used with relatively short steel materials since it is simple in construction, is leak-free, and provides ease in unbonding the steel material from the concrete, even if the steel member has screws or heads at end portions.
  • Fig. 2 One problem with the design in Fig. 2 is that the presence of the asphalt (or, alternatively, a paint) may adversely affect the working environment due to the inclusion therein of a volatile organic solvent. Moreover, the floor may be fouled by the splashing of the asphalt or paint. As another problem, great difficulty is involved in handling the coated steel material during drying or positioning within a framework, and separation of the asphalt coating can easily occur unless utmost care is taken in ensuring the desired coating thickness.
  • the asphalt or, alternatively, a paint
  • This object of the present invention is achieved by sheathing a steel material for prestressed concrete with a heat-shrinkable synthetic resin tube.
  • reference numeral indicates a steel member (1) and reference numeral 6 a heat-shrinkable synthetic resin tube.
  • the steel member is sheathed with a heat-shrinkable synthetic resin tube.
  • the steel material need not be bonded to the heat-shrinkable synthetic resin tube with an adhesive material. If improved rust-preventing and anti-corrosion effects are desired, the steel member and the resin tube may be bonded by an adhesive material. If the steel member is a bar, a heat-fusible synthetic resin adhesive is coated or placed on the inner surface of the resin tube or the outer surface of the steel bar, and, after the resin tube is slipped over the steel bar, heat is applied to cause the resin tube to shrink as the resin adhesive melts to provide firm adhesion between the steel bar and the resin tube. It has been found by the present inventors that this method is the simplest and best way to ensure firm bonding between the steel bar and the synthetic resin tube.
  • Fig. 3 The steel material for prestressed concrete according to this embodiment is illustrated in Fig. 3, wherein reference numeral 1 refers to the steel member and 6 represents the heat-shrinkable synthetic resin tube coated on the surface of the steel member.
  • the steel member 1 is inserted into a prefabricated heat-shrinkable synthetic resin tube, which is then heated by hot air, steam or with an IR (infrared) heater to shrink and tightly fit it onto the surface of the steel member.
  • IR infrared
  • the wall thickness of the heat-shrinkable synthetic resin tube must be at least 300 ⁇ m (microns) to isolate the steel member 1 and the surrounding concrete layer sufficiently to provide good slippage between the two components.
  • the wall thickness of the synthetic resin tube after heat shrinking can be approximated by the following equation:
  • a heat-shrinkable polyolefin tube has a heat shrinkage of about 35%.
  • the inside diameter of the tube can be selected from the range of 1.1 to 1.5 times the outside diameter of the steel bar. This fairly large inside diameter of the polyolefin tube permits considerable ease in inserting the steel bar through the tube.
  • the desired wall thickness of the tube will be provided around the steel bar after heat shrinkage.
  • the present invention is also applicable to a steel strand composed of a plurality of twisted steel wires as shown in Fig. 4.
  • the resulting strand has spiral grooves as indicated by A and B in Fig. 4. Not only do these grooves render the posttensioning of the strand difficult, but they also increase the frictional resistance on the stressed concrete.
  • the grooves are filled with a resin. Such filling with a resin may be accomplished by extrusion or other suitable techniques. Subsequently, the thus-treated steel strand is sheathed with the foamed synthetic resin tube as above.
  • a steel material for use with prestressed concrete can be easily manufactured.
  • the resulting steel material is easy to handle during transportation and installation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP19880111961 1983-12-16 1984-12-14 Matériau précontraint en acier Expired EP0298524B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP194474/83U 1983-12-16
JP1983194474U JPS60102327U (ja) 1983-12-16 1983-12-16 Ｐｃ鋼材
JP194473/83U 1983-12-16
JP1983194473U JPS60102326U (ja) 1983-12-16 1983-12-16 Ｐｃ鋼材

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP84115412.3 Division 1984-12-14

Publications (3)

Publication Number Publication Date
EP0298524A2 true EP0298524A2 (fr) 1989-01-11
EP0298524A3 EP0298524A3 (en) 1989-02-01
EP0298524B1 EP0298524B1 (fr) 1992-07-08

Family

ID=26508522

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19840115412 Expired EP0146126B1 (fr) 1983-12-16 1984-12-14 Elément de béton précontraint par post-tension
EP19880111961 Expired EP0298524B1 (fr) 1983-12-16 1984-12-14 Matériau précontraint en acier

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19840115412 Expired EP0146126B1 (fr) 1983-12-16 1984-12-14 Elément de béton précontraint par post-tension

Country Status (5)

Country Link
EP (2) EP0146126B1 (fr)
AU (2) AU571913B2 (fr)
CA (1) CA1243501A (fr)
DE (2) DE3485807T2 (fr)
NZ (1) NZ210568A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0441029A1 (fr) * 1990-02-08 1991-08-14 SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO.LTD. Procédé de fabrication d'éléments de précontraintes pour structures en béton précontraint
DE102014003015A1 (de) * 2014-03-07 2015-09-10 Tss Technische Sicherheits-Systeme Gmbh Betonleitwand sowie Verfahren zur Herstellung einer Betonleitwand

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0198398B1 (fr) * 1985-04-08 1990-08-01 Sumitomo Electric Industries Limited Matériau d'acier de précontrainte
JPH0811791B2 (ja) * 1987-07-27 1996-02-07 神鋼鋼線工業株式会社 プレストレストコンクリート緊張材用塗布材料
AUPN645295A0 (en) * 1995-11-08 1995-11-30 Armacel Pty Limited A reinforcing bar
CN104847055A (zh) * 2015-03-16 2015-08-19 山西省交通科学研究院 一种免注浆的胶粘结预应力钢筋及其制备与施工方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1559568A1 (de) * 1965-02-11 1970-02-12 Intercontinentale Technik Ges Spannglieder aus Einzelfasern
FR2059452A1 (en) * 1969-08-07 1971-06-04 Alexandre Pierre Protecting steel prestressing members inconcrete
US3646748A (en) * 1970-03-24 1972-03-07 Frederic A Lang Tendons for prestressed concrete and process for making such tendons
FR2378894A1 (fr) * 1977-01-29 1978-08-25 Saar Gmbh Drahtseilwerk Cable metallique dont l'ame est enrobee de matiere plastique expansee, et procede de fabrication de ce cable
DE2911212A1 (de) * 1979-03-22 1980-10-23 Falkner Horst Zwei- oder mehrschichtige umhuellung von spanngliedern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1559568A1 (de) * 1965-02-11 1970-02-12 Intercontinentale Technik Ges Spannglieder aus Einzelfasern
FR2059452A1 (en) * 1969-08-07 1971-06-04 Alexandre Pierre Protecting steel prestressing members inconcrete
US3646748A (en) * 1970-03-24 1972-03-07 Frederic A Lang Tendons for prestressed concrete and process for making such tendons
FR2378894A1 (fr) * 1977-01-29 1978-08-25 Saar Gmbh Drahtseilwerk Cable metallique dont l'ame est enrobee de matiere plastique expansee, et procede de fabrication de ce cable
DE2911212A1 (de) * 1979-03-22 1980-10-23 Falkner Horst Zwei- oder mehrschichtige umhuellung von spanngliedern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0441029A1 (fr) * 1990-02-08 1991-08-14 SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO.LTD. Procédé de fabrication d'éléments de précontraintes pour structures en béton précontraint
DE102014003015A1 (de) * 2014-03-07 2015-09-10 Tss Technische Sicherheits-Systeme Gmbh Betonleitwand sowie Verfahren zur Herstellung einer Betonleitwand

Also Published As

Publication number Publication date
AU571913B2 (en) 1988-04-28
AU1214788A (en) 1988-06-02
EP0298524B1 (fr) 1992-07-08
EP0298524A3 (en) 1989-02-01
EP0146126A2 (fr) 1985-06-26
EP0146126B1 (fr) 1992-03-11
CA1243501A (fr) 1988-10-25
AU582321B2 (en) 1989-03-16
EP0146126A3 (en) 1986-12-17
DE3485807T2 (de) 1992-12-10
AU3667784A (en) 1985-06-20
DE3485571D1 (de) 1992-04-16
NZ210568A (en) 1991-01-29
DE3485807D1 (de) 1992-08-13

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