US3422592A - Anchor device for steel reinforcing cables - Google Patents

Anchor device for steel reinforcing cables Download PDF

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Publication number
US3422592A
US3422592A US614508A US3422592DA US3422592A US 3422592 A US3422592 A US 3422592A US 614508 A US614508 A US 614508A US 3422592D A US3422592D A US 3422592DA US 3422592 A US3422592 A US 3422592A
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US
United States
Prior art keywords
cables
steel
socket
anchor
plug
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
US614508A
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English (en)
Inventor
Trygve Gjerde
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.)
STORMBULL AS
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STORMBULL AS
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Filing date
Publication date
Application filed by STORMBULL AS filed Critical STORMBULL AS
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Publication of US3422592A publication Critical patent/US3422592A/en
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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
    • Y10T403/00—Joints and connections
    • Y10T403/47—Molded joint
    • Y10T403/472—Molded joint including mechanical interlock
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/47—Molded joint
    • Y10T403/473—Socket or open cup for bonding material
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/71—Rod side to plate or side
    • Y10T403/7129—Laterally spaced rods
    • Y10T403/7141—Plural channels in connector

Definitions

  • the present invention relates to a new embodiment of an anchor device for tension members in prestressed concrete, particularly for tension members of the wire cable type. More particularly the invention relates to a new embodiment of a socket anchor device for securing the ends of high strength wire cable and the like, to provide an anchor head.
  • the invention shall hereafter be described in connection with tension members in the shape of steel wire cables, but it shall be understood that the invention can be realized with other kinds of tension members, for example with steel wire strands or relatively thin steel rods.
  • building structures of prestressed concrete can be produced in various known ways.
  • the tension steel members are tensioned, for example between tension blocks or in special stretching benches straddling the moulds and the concrete is poured into the moulds, the tension stress in the tension steel being transmitted to the concrete mass by bending between the steel and concrete when the concrete has attained about 70% of its 28 day strength.
  • a so-called primary anchor On each end of the tension steel members is connected a so-called primary anchor which must be brought into firm and intimate contact with the surrounding concrete mass before the tension stress exerted in the steel by the jack is removed.
  • a tube-shaped or conically shaped recess in the concrete mass around the outer end or ends of the steel on each side of the concrete structure in question which recesses are filled completely with cement grouting or other high compressive strength binding mass, such that the primary anchor secured on the tension steel is moulded into the concrete (injection anchoring).
  • the main object of the present invention is to provide an improved primary anchor, particularly for steel wire cables and the like, which possesses improved strength characteristics, high reliability and is simple and quick to assemble at the building site.
  • the anchor device in accordance with the invention is used for securing the ends of parallel tension steel members, particularly steel wire cables, and comprises a socket including a tubular sleeve having a central axis and opposite ends, and a plug secured in said sleeve at one of said ends, said plug being provided with apertures through which the steel reinforcing members pass with the ends thereof terminating inside the sleeve in spaced relation with the other end of the sleeve, an outwardly tapered block in said sleeve, said block being disposed between the reinforcing members proximate said ends thereof, a clamping ring positioned around the reinforcing members outside the block and cooperating therewith to exert pressure on the reinforcing members and cause the reinforcing members to assume an outwardly arched course between the block and plug relative to the axis through the sleeve, and high compressive strength material filling said sleeve and surrounding the reinforcing members and in intimate contact therewith.
  • the tension stresses in the wire cables are uniformly transferred to and received by the filling material, the stresses thereafter being transmitted as radial or partly radial stresses in the binding mass and from the binding mass to the socket and the plug therein.
  • the stress pattern in the socket will furthermore be such that the tensile stresses in the cables result in an increased bonding force between the cables and the binding mass, and furthermore a wedging effect is produced in the binding mass between the arched courses of the steel cables.
  • the wire cables will, however, simultaneously also be kept in the socket due to the so-called Hoyer-efr'ect, i.e.
  • the cables will possess no stresses at all on the outside or at the end where the cross-sectional area is zero while the stresses will increase uniformly in direction inwardly toward the plug.
  • the cross-sectional area of the steel in the wire cables will therefore decrease in direction inwardly subject to deformation, a fact which results in the formation of radial stresses which again provide great frictional forces and consequent resistance to displacement between the wire cable material and the surrounding mass.
  • FIG. 1 is a central longitudinal section through a ready assembled primary anchor in accordance with the invention
  • FIG. 2 is a cross-sectional view taken along line IIII of FIG. 1,
  • FIG. 3 is a sectional view through a prestressed concrete building structure, illustrating the anchor devices in accordance with the invention, the primary anchor shown on the left side of the figure corresponding to the anchor shown in FIGS. 1 and 2, and which is transferring the power directly to the surrounding mass, in other words injection anchoring, while the primary anchor shown on the right side of the figure is transferring the power or stresses via a secondary anchor having a nut and an anchor plate.
  • FIG. 4 is a longitudinal section view similar to that of FIG. 1 of a modified embodiment of the invention.
  • FIG. 5 is a cross sectional view taken along line V-V in FIG. 1.
  • reference number 2 designates a socket in the form of a tubular sleeve, suitably a part of a steel pipe, surrounding the end portions of tension members 4 which in the illustrated embodiment and constituted by four steel wire cables which are evenly circumferentially spaced about a central axis.
  • tension members 4 which in the illustrated embodiment and constituted by four steel wire cables which are evenly circumferentially spaced about a central axis.
  • the cables are passed through a plug 6 comprising an externally threaded annular block which is screwed into corresponding internal threads 8 in the socket 2.
  • the plug 6, disregarding the apertures 10 for the passage of members 4, is provided with a closed cross-sectional area.
  • the inside face of the plug is recessed and provided with an inwardly diverging opening face 12 as shown in FIG. 1.
  • a block 16 is positioned a short distance inwardly of the outer extremities 14 of the steel cable.
  • the block is doubly tapered and receives the cables on its periphery and around this block and the four cables is positioned an annular clamping ring 18, whereby the cables are clamped and pressed together on that portion of the tapered block having the smallest diameter.
  • Each of the wire sections in the socket is thereby pressed radially outwards such that they attain a waved or arch-shaped course 20 such as shown.
  • the end portions 22 of each of the cables are forced outwardly to a substantially curved course as shown.
  • the assembly of the anchor is suitably carried out in this way. Firstly the cables are slipped through the respective apertures 10 in the plug which has beforehand been screwed into the socket 2. The socket with the plug is then slipped along the cables until the ends of same extend a sizable distance out of the opening 24. Now the cables are bunted together and the tapered member 16 is put between the cables. The clamping ring 18 is slipped over the ends of the cables and the clamping ring is clamped together for instance by means of a tangential tightening screw 19 (FIG. The cables will thereby be pressed against the portion of the tapered block which has reduced diameter with the result that the wire sections 20 are forced apart and are given a diverging course.
  • the socket is thereafter filled completely, preferablyby injection, with a high compressive strength binding mass 25, for instance an epoxy-resin-type, steel plastic or the like, to cover the cables completely as shown.
  • a high compressive strength binding mass for instance an epoxy-resin-type, steel plastic or the like.
  • the type and the number of the steel wires can be varied in accordance with the need. But at least two cables must be present if the primary anchor in accordance with the invention shall give the desired effect.
  • the plug 6 need not necessarily have a conical inside face as shown, since the main purpose of the plug is to keep the cables correctly positioned to obtain the wave-shaped curvature as shown.
  • a conical inside face on the plug has the advantage that there is created an outwardly directed radial pressure against the socket via the binding mass when the steel members are tensioned, which contributes to keep the plug and thereby the steel members firmly in the socket.
  • the tapered member need not necessarily be of double conical shape as shown and can, by way of example, consist of a simple cone 33, such as shown in FIGURE 4, which acts in combination with a clamp ring 35 placed around the bunt of cables.
  • a double tapered block is preferred, however, because the assembly is simplified.
  • the socket In order to increase the adhesion between the steel cables and the binding mass, one can beforehand apply in the socket and on the cables an epoxy-resin etc., which also can be mixed with metal particles or the like.
  • the inside of the socket can furthermore be provided with threads all the way through to form a very rough inside surface.
  • An anchor device for securing the ends of a plurality of parallel reinforcing members, said device comprising a socket including a tubular sleeve having a central axis and opposite ends, and a plug secured in said sleeve at one of said ends, said plug being provided with apertures through which the reinforcing members pass with the ends thereof terminating inside the sleeve in spaced relation with the other end of the sleeve, an outwardly tapered block in said sleeve, said block being disposed between the reinforcing members proximate said ends thereof, a clamping ring positioned around the reinforcing members outside the block and cooperating therewith to exert pressure on the reinforcing members and cause the reinforcing members to assume an outwardly arched course between the block and plug relative to the axis through the sleeve, and high compressive strength material filling said sleeve and surrounding the reinforcing members and in intimate contact therewith.
  • a device in accordance with claim 1 comprising thread means on said socket and plug threadably engaging the same together.
  • a device in accordance with claim 1 wherein said plug has an inner surface extending into the sleeve beyond said apertures for supporting the reinforcing members, said surface outwardly diverging from said apertures.
  • a device in accordance with claim 1 wherein said block is of double tapered conical shape converging towards its center and said clamping ring is disposed around the center of the double tapered conical shape block.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
US614508A 1966-02-09 1967-02-07 Anchor device for steel reinforcing cables Expired - Lifetime US3422592A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO161628A NO115756B (show.php) 1966-02-09 1966-02-09

Publications (1)

Publication Number Publication Date
US3422592A true US3422592A (en) 1969-01-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US614508A Expired - Lifetime US3422592A (en) 1966-02-09 1967-02-07 Anchor device for steel reinforcing cables

Country Status (3)

Country Link
US (1) US3422592A (show.php)
GB (1) GB1117408A (show.php)
NO (1) NO115756B (show.php)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641772A (en) * 1970-06-04 1972-02-15 Losinger Ag Rock anchor
US4011020A (en) * 1974-02-20 1977-03-08 Erich Frantl Transfer joint for rigid frames
US4043690A (en) * 1975-08-28 1977-08-23 York Engineering, Inc. Wire rope termination
US4113398A (en) * 1976-09-03 1978-09-12 Jordan Edgar R Reinforced aperture in molded plastic article
US4353268A (en) * 1976-03-10 1982-10-12 Avions Marcel Dassault-Breguet Aviation Connecting rods
US5337621A (en) * 1993-11-18 1994-08-16 Teleflex Incorporated Cable end fitting retainer and method for making same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL76504C (show.php) *
US2751660A (en) * 1951-02-03 1956-06-26 Nakonz Walter Method of pre-stressing reinforced concrete structural elements
US2934935A (en) * 1956-01-20 1960-05-03 Holzmann Philipp Ag Cast tensioning head for anchoring tensioning members, preferably for prestressed concrete
FR1381003A (fr) * 1963-01-24 1964-12-04 A C Applic Coazioni S P A Procédé et dispositif pour ancrer des fils, câbles et rondins d'acier à haute résistance, en les mettant sous tension préventive, ainsi que pour la formation de jets et structures de béton armé précontraint

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL76504C (show.php) *
US2751660A (en) * 1951-02-03 1956-06-26 Nakonz Walter Method of pre-stressing reinforced concrete structural elements
US2934935A (en) * 1956-01-20 1960-05-03 Holzmann Philipp Ag Cast tensioning head for anchoring tensioning members, preferably for prestressed concrete
FR1381003A (fr) * 1963-01-24 1964-12-04 A C Applic Coazioni S P A Procédé et dispositif pour ancrer des fils, câbles et rondins d'acier à haute résistance, en les mettant sous tension préventive, ainsi que pour la formation de jets et structures de béton armé précontraint

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641772A (en) * 1970-06-04 1972-02-15 Losinger Ag Rock anchor
US4011020A (en) * 1974-02-20 1977-03-08 Erich Frantl Transfer joint for rigid frames
US4043690A (en) * 1975-08-28 1977-08-23 York Engineering, Inc. Wire rope termination
US4353268A (en) * 1976-03-10 1982-10-12 Avions Marcel Dassault-Breguet Aviation Connecting rods
US4113398A (en) * 1976-09-03 1978-09-12 Jordan Edgar R Reinforced aperture in molded plastic article
US5337621A (en) * 1993-11-18 1994-08-16 Teleflex Incorporated Cable end fitting retainer and method for making same

Also Published As

Publication number Publication date
NO115756B (show.php) 1968-11-25
GB1117408A (en) 1968-06-19

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