EP0298524B1 - Vorspannstahlmaterial - Google Patents

Vorspannstahlmaterial Download PDF

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Publication number
EP0298524B1
EP0298524B1 EP19880111961 EP88111961A EP0298524B1 EP 0298524 B1 EP0298524 B1 EP 0298524B1 EP 19880111961 EP19880111961 EP 19880111961 EP 88111961 A EP88111961 A EP 88111961A EP 0298524 B1 EP0298524 B1 EP 0298524B1
Authority
EP
European Patent Office
Prior art keywords
steel
heat
resin tube
tube
steel member
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
EP19880111961
Other languages
English (en)
French (fr)
Other versions
EP0298524A2 (de
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/de
Publication of EP0298524A3 publication Critical patent/EP0298524A3/en
Application granted granted Critical
Publication of EP0298524B1 publication Critical patent/EP0298524B1/de
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
    • D07B1/16—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 elongated prestressing elements embedded in prestressed 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 ⁇ 1. 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 of a volatile organic solvent therein. 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
  • US-A-3646748 describes an elongated prestressing element embedded in prestressed concrete, wherein said prestressing element comprises a steel member and a synthetic resin tube surrounding the outer surfaces of said steel member and in which the prestressing element is subjected to postensioning in an unbounded state wherein the prestressing material is not bonded to and is free to move relative to the concrete and wherein the steel member is not movable relative to the synthetic resin tube.
  • a prestressing steel material embedded in prestressed concrete comprising a steel member and a synthetic resin tube wherein the prestressing steel material is free to move relative to the concrete and the steel member is not movable relative to the heat-shrinkable synthetic resin tube
  • said prestressing steel material comprises a steel strand comprising a plurality of steel wires twisted together, said steel strand having spiral grooves a resin filling said grooves and said resin tube made of a heat shrinkable resin covering said strand and said resin and heat-shrunk around said strand to provide intimate contact between said strand and said resin tube and further comprising an adhesive material provided between the steel member and the heat-shrinkable synthetic resin tube, wherein upon application of heat, the tube shrinks as the adhesive melts to adhere the steel member and the resin tube before the steel strand is embedded in the prestressed concrete as well as an elongated prestressing steel material embedded in prestressed concrete, wherein said prestressing steel material comprises a
  • reference numeral 1 indicates a steel member and reference numeral 6 a heat-shrinkable synthetic resin tube.
  • the resin material is preferably a polyolefin, e.g. high-density polyethylene.
  • the steel member is sheathed with a heat-shrinkable synthetic resin tube.
  • the steel material is bonded to the heat-shrinkable synthetic resin tube with an adhesive material, to improve rust-preventing and anti-corrosion effects
  • 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 is preferably at least 300 ⁇ m to isolate the steel member 1 and the surrounding concrete layer sufficiently to provide good slippage between the two components.
  • 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.
  • Continuous saltwater spray test (2,000 h) JIS Z 2371 (5% aq. NaCl, 35°C) No rust or blister formed on the sample surface No rust on the internal steel bar.
  • Saltwater immerion test (2,000 h) Immersed in 3% aq. NaCl at 25°C No rust or blister formed on the sample surface. No rust on the internal steel bar.
  • Alkali resistance test (2,000 h) Immersed in 3% aq. NaCl at 25°C that was adjested to pH 11 with KOH No rust or blister formed on the sample surfact. No rust on the internal steel bar.
  • 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 steel 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 heat-shrinkable synthetic resin tube as above.
  • the resulting steel material can be easily manufactured and is easy to handle during transportation and installation.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Claims (5)

  1. Vorspannstahlmaterial, eingebettet in Spannbeton (4), umfassend ein Stahlteil und ein synthetisches Harzrohr bzw. -schlauch (6), worin das Vorspannstahlmaterial frei beweglich ist mit Bezug auf den Beton und das Stahlteil nicht beweglich ist mit Bezug auf das wärmeschrumpfbare synthetische Harzrohr, dadurch gekennzeichnet, daß das Vorspannstahlmaterial einen Stahlstrang, umfassend eine Mehrzahl von Stahldrähten , die miteinander verdreht sind, umfaßt, wobei der Stahlstrang spiralförmige Rillen (A,B) besitzt, ein Harz die Rillen füllt und das Harzrohr (6) aus einem wärmeschrumpfbaren Harz, das den Strang und das Harz bedeckt, hergestellt ist und um den Strang wärmegeschrumpft ist, um einen innigen Kontakt zwischen dem Strang und dem Harzrohr zu ergeben, und weiterhin einen Klebstoff umfaßt, der zwischen dem Stahlteil und dem wärmeschrumpfbaren synthetischen Harzrohr vorgesehen ist, worin bei Wärmeanwendung das Rohr schrumpft, wenn der Klebstoff schmilzt, um das Stahlteil und das Harzrohr zu kleben, bevor der Stahlstrang in dem Spannbeton eingebettet wird.
  2. Verlängertes Vorspannstahlmaterial, eingebettet in Spannbeton, worin das Vorspannstahlmaterial ein Stahlteil und ein synthetisches Harzrohr bzw. -schlauch, das die Außenoberflächen des Stahlteils umgibt, umfaßt, worin das Vorspannstahlmaterial in einem ungebundenen Zustand ist und frei beweglich ist mit Bezug auf den Beton und das Stahlteil nicht beweglich ist mit Bezug auf das wärmeschrumpfbare synthetische Harzrohr, dadurch gekennzeichnet, daß das Harzrohr aus einem wärmeschrumpfbaren Harz hergestellt ist und daß ein Klebstoff zwischen dem Stahlteil und dem wärmeschrumpfbaren synthetischen Harzrohr vorgesehen ist, worin bei Wärmeanwendung das Rohr schrumpft, wenn der Klebstoff schmilzt, um das Stahlteil und das Harzrohr zu kleben, bevor das Stahlteil in dem Spannbeton eingebettet wird.
  3. Stahlmaterial nach Anspruch 1 oder 2, worin die Wanddicke des Harzrohrs wenigstens 300 µm beträgt.
  4. Stahlmaterial nach Anspruch 1 oder 2, worin das Harzmaterial ein Polyolefin ist.
  5. Stahlmaterial nach Anspruch 1 oder 2, worin das Harz ein Polyethylen hoher Dichte ist.
EP19880111961 1983-12-16 1984-12-14 Vorspannstahlmaterial Expired - Lifetime EP0298524B1 (de)

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 EP0298524A2 (de) 1989-01-11
EP0298524A3 EP0298524A3 (en) 1989-02-01
EP0298524B1 true EP0298524B1 (de) 1992-07-08

Family

ID=26508522

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19840115412 Expired - Lifetime EP0146126B1 (de) 1983-12-16 1984-12-14 Durch nachträgliche Vorspannung vorgespanntes Betonelement
EP19880111961 Expired - Lifetime EP0298524B1 (de) 1983-12-16 1984-12-14 Vorspannstahlmaterial

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19840115412 Expired - Lifetime EP0146126B1 (de) 1983-12-16 1984-12-14 Durch nachträgliche Vorspannung vorgespanntes Betonelement

Country Status (5)

Country Link
EP (2) EP0146126B1 (de)
AU (2) AU571913B2 (de)
CA (1) CA1243501A (de)
DE (2) DE3485571D1 (de)
NZ (1) NZ210568A (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0198398B1 (de) * 1985-04-08 1990-08-01 Sumitomo Electric Industries Limited Vorspannstahlkörper
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
AU625551B2 (en) * 1990-02-08 1992-07-16 Shinko Wire Company, Ltd also known as Shinko Kosen Kogyo Kabushiki Kaisha Tendons for prestressed concrete structures and method of using and process for making such tendons
AUPN645295A0 (en) * 1995-11-08 1995-11-30 Armacel Pty Limited A reinforcing bar
DE202014011344U1 (de) * 2014-03-07 2019-07-29 Strabag Ag Betonleitwand
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1559568B2 (de) * 1965-02-11 1976-04-08 Intercontinentale-Technik Gesellschaft f. Planung u. Konstruktion mbH, 8000 München Spannglied
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
DE2703670C2 (de) * 1977-01-29 1983-11-10 Drahtseilwerk Saar GmbH, 6654 Kirkel Drahtseil mit einem in geschäumten Kunststoff eingehüllten Seilkern
DE2911212A1 (de) * 1979-03-22 1980-10-23 Falkner Horst Zwei- oder mehrschichtige umhuellung von spanngliedern

Also Published As

Publication number Publication date
EP0146126A2 (de) 1985-06-26
AU582321B2 (en) 1989-03-16
DE3485571D1 (de) 1992-04-16
DE3485807D1 (de) 1992-08-13
NZ210568A (en) 1991-01-29
AU3667784A (en) 1985-06-20
EP0298524A2 (de) 1989-01-11
CA1243501A (en) 1988-10-25
EP0146126A3 (en) 1986-12-17
EP0298524A3 (en) 1989-02-01
EP0146126B1 (de) 1992-03-11
AU1214788A (en) 1988-06-02
AU571913B2 (en) 1988-04-28
DE3485807T2 (de) 1992-12-10

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