US3526941A - Method of fastening anchoring means to a tensioning wire - Google Patents

Method of fastening anchoring means to a tensioning wire Download PDF

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Publication number
US3526941A
US3526941A US760258A US3526941DA US3526941A US 3526941 A US3526941 A US 3526941A US 760258 A US760258 A US 760258A US 3526941D A US3526941D A US 3526941DA US 3526941 A US3526941 A US 3526941A
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US
United States
Prior art keywords
wire
anchoring
concrete
tensioning
abutment
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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
US760258A
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English (en)
Inventor
Antonio Brandestini
Hans Rudolf Siegwart
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/043—Wire anchoring or tensioning means for the reinforcements
    • 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
    • E04C5/12—Anchoring devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49623—Static structure, e.g., a building component
    • Y10T29/49632—Metal reinforcement member for nonmetallic, e.g., concrete, structural element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force

Definitions

  • the present invention relates to a method of fastening a steel anchoring element to a tensioning wire and to an associated anchoring termination.
  • An object of the present invention is to provide a method of fastening an anchoring element to a tensioning or stressing wire or rod so that the advantages of both prestressing methods may be exploited and their shortcomings simultaneously eliminated.
  • the invention provides a method of fastening an anchoring element to a tensioning wire in which the element is threaded over the wire through a hole provided in the element and corresponding to the cross-section of the wire, a node-shaped abutment or region of increased dimensions is formed on the wire such that the element cannot slip over the said abutment or region of increased dimensions, the element is finally clamped to the wire by means of external deformation of the element with simultaneous thrusting against the abutment or region of increased dimensions.
  • an anchoring element fastened to the wire structures may be performed iri'two ways: by posttensioning, in which the Wire or bundle of wires to be tensioned is laid along the entire length of a concrete mould and is tensioned after the setting of the concrete, being subsequently braced against the' concrete structure by means of a terminal anchoring device attached to the wire or bundle of wires; by pre-tensioning, in which one or more wires are tensioned against a so-called pretensioning bed or rigid form and anchored provisionally at their ends. After the concrete has set, the terminal anchoring devices are released to transfer the stressing force to the concrete by virtue of the adhesion between the wire surface and the concrete.
  • the present invention thus combines anchoring by adhesion with a terminal anchoring system which may be provided with one or more subsidiary intermediate anchoring devices.
  • a terminal anchoring system which may be provided with one or more subsidiary intermediate anchoring devices.
  • the terminal and intermediate anchoring devices are combined in a force-locked manner, that is to say the wire must not be allowed to slip until the terminal and intermediate anchoring devices come into action.
  • This can be fully accomplished by the force-locked thrust of the anchoring elements against the abutments, e.g. upset terminal or intermediate heads, and by tightly clamping the anchoring element to the wire.
  • T 0 this end a plurality of small anchoring elements may be employed, the numher and spacing of which may be arranged to suit the prevailing requirements.
  • FIG. 1 is a diagrammatic illustration of the end of a wire or rod on which an anchoring element has been fastened according to the invention
  • FIG. la shows a view of FIG. 1 in the direction of the arrow C;
  • FIG. 2 illustrates a longitudinal section taken through a concrete post or the like prestressed by means of tensioning wires according to FIG. 1;
  • FIG. 3 is a diagram illustrating the wire/concrete application of stress in accordance with the invention at the end of a stressed concrete structure.
  • FIG. 1 shows a tensioning wire or rod 1 in the unstressed condition, the end or a part near the end of which is provided with a bulge 2 formed in some manner as by upsetting, and on which is clamped fast in a manner to be described a disc-shaped steel anchoring element 3, so that the latter bears against bulge 2 in force-locked manner.
  • the anchoring element 3 provided with a central hole corresponding to the cross-section of the wire is threaded over the wire 1.
  • the bulge 2 is formed in the wire behind the anchoring element by means of an appropriate device, after which the anchoring element 3 is clamped fast to the wire by external deformation with simultaneous thrust against bulge 2.
  • this deformation is produced by a device which presses a circular notch or two semicircular notches 4, 4' (FIG. 1a) into the anchoring element 3, the material displaced thereby clamping anchoring element 3 firmly to the wire.
  • the internal elastic strains generated in the areas A, B of the anchoring element ensure that the anchoring element 3 bears tightly against wire 1 and bulge 2.
  • FIG. 2 shows at 5 a hollow concrete mast, pylon or the like made by a spin-casting process.
  • the mast 5 is prestressed by means of a number of tensioning wires 6 and 7.
  • Two small anchoring plates 8, 9 and 8', 9' are secured at the ends of each wire against abutments 10, 10'. Thanks to these small anchoring plates, the cast and at least partially cured mast 5 may be stripped from the moulds after a relatively short time, since the present anchoring method ensures a reliable application of stress. This permits economical use to be made of the costly moulds or moulding machines.
  • the stress curve at the end of the concrete structure is illustrated in FIG. 3.
  • We anchoring elements are situated on the end portion of the wire, allowing transmission of a total tensioning force T by means of the wire.
  • Tensioning wires equipped with anchoring elements fastened according to the invention are particularly appropriate for thin-walled concrete structures, since there is no room in this case for anchoring plates of greater size.
  • a common anchoring element may be employed for several wires.
  • a method of fastening an anchoring element to a tensioning wire said anchoring element being provided with a hole corresponding to the cross section of the wire, which method comprises threading said element over the wire, subjecting the wire end to an upsetting operation to form a node-shaped abutment on the wire between said element and the wire end such that the element cannot slip over said abutment, and then thrusting said element against said abutment while simultaneously subjecting the element to external deformation pressure for clamping the element to the wire.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
US760258A 1967-09-19 1968-09-17 Method of fastening anchoring means to a tensioning wire Expired - Lifetime US3526941A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1313267A CH464483A (de) 1967-09-19 1967-09-19 Verfahren zum Befestigen eines Ankerkörpers aus Stahl auf einem Spanndraht

Publications (1)

Publication Number Publication Date
US3526941A true US3526941A (en) 1970-09-08

Family

ID=4389591

Family Applications (1)

Application Number Title Priority Date Filing Date
US760258A Expired - Lifetime US3526941A (en) 1967-09-19 1968-09-17 Method of fastening anchoring means to a tensioning wire

Country Status (11)

Country Link
US (1) US3526941A (enExample)
JP (1) JPS498013B1 (enExample)
AT (1) AT294385B (enExample)
BE (1) BE720627A (enExample)
CH (1) CH464483A (enExample)
DE (1) DE1784332B2 (enExample)
ES (1) ES357354A1 (enExample)
FR (1) FR1580716A (enExample)
GB (1) GB1237149A (enExample)
NL (1) NL158575B (enExample)
SE (1) SE350089B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040072720A1 (en) * 2002-10-10 2004-04-15 Joseph Brain Encapsulated fragrance chemicals
CN111910930A (zh) * 2020-08-04 2020-11-10 中建筑港集团有限公司 一种现浇箱梁后张法预应力钢筋穿束装置
CN113417807A (zh) * 2021-07-07 2021-09-21 重庆大学 一种风电机组混凝土塔筒预应力钢绞线端部保护装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906797A1 (de) * 1979-02-22 1980-09-04 Bechert Heinrich Stahlbetonteil, insbesondere stahlbetonfertigteiltraeger, und verfahren zur herstellung desselben
US4237771A (en) * 1979-06-28 1980-12-09 Robertshaw Controls Company Pneumatically operated actuator and method of making the same
DE3005047C2 (de) * 1980-02-11 1983-12-08 Dyckerhoff & Widmann AG, 8000 München Spannbetonbauteil, hergestellt nach dem Spannverfahren ohne Verbund
GB8407596D0 (en) * 1984-03-23 1984-05-02 Manuf Aceros Caucho Sa Reinforcing tendon

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2177191A (en) * 1938-07-29 1939-10-24 Houdaille Hershey Corp Method of applying a pivot pin to thin stock
US2657455A (en) * 1949-03-02 1953-11-03 Superior Concrete Accessories Method of manufacturing tie rods for concrete wall forms
US3075772A (en) * 1961-05-19 1963-01-29 Stanley J Martino Game apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2177191A (en) * 1938-07-29 1939-10-24 Houdaille Hershey Corp Method of applying a pivot pin to thin stock
US2657455A (en) * 1949-03-02 1953-11-03 Superior Concrete Accessories Method of manufacturing tie rods for concrete wall forms
US3075772A (en) * 1961-05-19 1963-01-29 Stanley J Martino Game apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040072720A1 (en) * 2002-10-10 2004-04-15 Joseph Brain Encapsulated fragrance chemicals
CN111910930A (zh) * 2020-08-04 2020-11-10 中建筑港集团有限公司 一种现浇箱梁后张法预应力钢筋穿束装置
CN111910930B (zh) * 2020-08-04 2022-02-01 中建筑港集团有限公司 一种现浇箱梁后张法预应力钢筋穿束装置
CN113417807A (zh) * 2021-07-07 2021-09-21 重庆大学 一种风电机组混凝土塔筒预应力钢绞线端部保护装置

Also Published As

Publication number Publication date
FR1580716A (enExample) 1969-09-05
CH464483A (de) 1968-10-31
DE1784332A1 (de) 1971-08-05
ES357354A1 (es) 1970-03-16
BE720627A (enExample) 1969-02-17
NL158575B (nl) 1978-11-15
GB1237149A (en) 1971-06-30
AT294385B (de) 1971-11-25
NL6813202A (enExample) 1969-03-21
DE1784332B2 (de) 1976-04-29
SE350089B (enExample) 1972-10-16
JPS498013B1 (enExample) 1974-02-23

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