EP0146126A2 - Elément de béton précontraint par post-tension - Google Patents

Elément de béton précontraint par post-tension Download PDF

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Publication number
EP0146126A2
EP0146126A2 EP84115412A EP84115412A EP0146126A2 EP 0146126 A2 EP0146126 A2 EP 0146126A2 EP 84115412 A EP84115412 A EP 84115412A EP 84115412 A EP84115412 A EP 84115412A EP 0146126 A2 EP0146126 A2 EP 0146126A2
Authority
EP
European Patent Office
Prior art keywords
steel
synthetic resin
tube
steel material
strand
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
EP84115412A
Other languages
German (de)
English (en)
Other versions
EP0146126B1 (fr
EP0146126A3 (en
Inventor
Kanji C/O Itami Works Of Sumitomo Watanabe
Mikio C/O Itami Works Of Sumitomo Mizoe
Eiji C/O Itami Works Of Sumitomo 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 EP0146126A2 publication Critical patent/EP0146126A2/fr
Publication of EP0146126A3 publication Critical patent/EP0146126A3/en
Application granted granted Critical
Publication of EP0146126B1 publication Critical patent/EP0146126B1/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- 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 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
  • a primary object of the present invention is to provide a steel material for use with prestressed concrete that is free from the problems associated with the prior art techniques.
  • 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 the 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 microns in order to isolate the steel member 1 and the surrounding concrete layer sufficiently to provide good slippage between the two components.
  • the wall thickness to 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 steel member is sheathed by a foamed synthetic resin tube 7 in Fig. 3.
  • a synthetic resin powder containing a blowing agent is applied to provide a foamed coating on the surface of a preheated steel member by a fluidized dip coating or electrostatic coating technique.
  • a film of synthetic resin containing a blowing agent is formed on the surface of the steel member 1, which is then passed through a heating chamber to expand the resin film into a foam.
  • a preliminarily formed synthetic resin foam tube 6 may be slipped over the steel member 1. The resin tube 6 may or may to be bonded to the steel member 1.
  • the foamed synthetic resin tube 6 In order to isolate the steel material 1 sufficiently from concrete to facilitate the subsequent posttensioning, the foamed synthetic resin tube 6 must have a wall thickness of at least 300 microns. Furthermore, in order to reduce the frictional resistance and therefore the slippage between the steel member 1 and the concrete, the resin tube 6 preferably has a wall thickness of at least 500 microns.
  • Steel bars one example of a steel member according to the present invention, were sheathed with a foamed polyethylene tube.
  • the tube was prepared from a blowing agent loaded polyethylene powder that was applied to preheated steel bars using a fluidized dip coating technique.
  • the properties of these samples were as shown in Tables 4 and 5:
  • 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 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)
EP19840115412 1983-12-16 1984-12-14 Elément de béton précontraint par post-tension Expired EP0146126B1 (fr)

Applications Claiming Priority (4)

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

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP88111961.4 Division-Into 1984-12-14

Publications (3)

Publication Number Publication Date
EP0146126A2 true EP0146126A2 (fr) 1985-06-26
EP0146126A3 EP0146126A3 (en) 1986-12-17
EP0146126B1 EP0146126B1 (fr) 1992-03-11

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 After (1)

Application Number Title Priority Date Filing Date
EP19880111961 Expired EP0298524B1 (fr) 1983-12-16 1984-12-14 Matériau précontraint en acier

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
EP0198398A3 (en) * 1985-04-08 1987-08-12 Sumitomo Electric Industries Limited Prestressing steel material
WO1997017510A1 (fr) * 1995-11-08 1997-05-15 Armacel Pty. Limited Barre ou tuyau gaine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
RU2176301C1 (ru) * 2000-06-20 2001-11-27 Ульяновский государственный технический университет Способ предварительного напряжения железобетонных конструкций
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0198398A3 (en) * 1985-04-08 1987-08-12 Sumitomo Electric Industries Limited Prestressing steel material
US4849282A (en) * 1985-04-08 1989-07-18 Sumitomo Electric Prestressing steel material
WO1997017510A1 (fr) * 1995-11-08 1997-05-15 Armacel Pty. Limited Barre ou tuyau gaine

Also Published As

Publication number Publication date
EP0298524A2 (fr) 1989-01-11
CA1243501A (fr) 1988-10-25
AU582321B2 (en) 1989-03-16
DE3485807D1 (de) 1992-08-13
EP0298524A3 (en) 1989-02-01
EP0146126B1 (fr) 1992-03-11
NZ210568A (en) 1991-01-29
AU571913B2 (en) 1988-04-28
DE3485807T2 (de) 1992-12-10
AU1214788A (en) 1988-06-02
AU3667784A (en) 1985-06-20
EP0298524B1 (fr) 1992-07-08
EP0146126A3 (en) 1986-12-17
DE3485571D1 (de) 1992-04-16

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