US3748723A - Method of anchoring wires and strands in prestressed concrete - Google Patents

Method of anchoring wires and strands in prestressed concrete Download PDF

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Publication number
US3748723A
US3748723A US00150029A US3748723DA US3748723A US 3748723 A US3748723 A US 3748723A US 00150029 A US00150029 A US 00150029A US 3748723D A US3748723D A US 3748723DA US 3748723 A US3748723 A US 3748723A
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US
United States
Prior art keywords
wire
strand
sleeve
sleeves
coil
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
US00150029A
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English (en)
Inventor
H Tomioka
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.)
Kobelco Wire Co Ltd
Original Assignee
Shinko Wire Co 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
Application filed by Shinko Wire Co Ltd filed Critical Shinko Wire Co Ltd
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Publication of US3748723A publication Critical patent/US3748723A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49927—Hollow body is axially joined cup or tube
    • Y10T29/49929—Joined to rod

Definitions

  • ABSTRACT A method of anchoring wires or strands in prestressed
  • Foreign Application Priority Data concrete comprising the steps of twisting a non-circular Dec 3 1970 Ja an 45/107846 cross sect1on wire to form a co1l in a steel sleeve havmg p a length equal to about two times the diameter of the wire or strand, engaging a free end of the wire with the 8 g ig i, 2 twisted wire coil by sliding the sleeve and twisted wire
  • Fieid 29/517 coil over the wire or strand and fixing the sleeve by a 223 24/l23 swaging or pressing within the range of 10-30 percent of reduction ratio.
  • FIG] 5 METHOD OF ANCHORING WIRES AND STRANDS IN PRESTRESSED CONCRETE BACKGROUND OF THE INVENTION 1.
  • This invention relates generally to the anchoring of wires and more particularly pertains to an improved method of anchoring wires or strands being employed for making prestressed concrete.
  • This invention contemplates an improved method of anchoring wires and strands for prestressed concrete in which the wire or strand is fixed to a sleeve by using an intervener and by pressing or swaging techniques.
  • a characteristic feature of this invention is that the anchor is fixed by pressing or swaging within the lim- I ited range of compressive force, being composed of the wire, a sleeve having a relief in its side near-the anchor plate and a substantially helical coil of wire having a non-circular cross section so as to have narrow longitudinal edges which extend substantially in a helix about the axis of the wire.
  • PC wire the wire or strand for prestressed concrete hereinafter will be called PC wire.
  • swaging means extruding by die, rolling or hammering, and that pressing means pressing by segment dies.
  • the twisted coil is a hardened and brittled material. Its edges contact both the sleeve and the PC wire surrounded by the sleeve in turn and become small fragments when the outer sleeve is compressed about the PC wire by swaging or pressing, as will be described in detail herebelow.
  • the gripping force of the sleeve is greatly strengthened by these small fragments which cut into both the sleeve and the wire, and thereby provide a gripping force which is quite consistent and improves the anchorage efficiency.
  • Another characteristic feature of this invention is the provision of relief of the sleeve at an end close to the anchor plate.
  • the shape of the relief may be different, depending upon the method of forming. For example, when the sleeveis formed by swaging, the sleeve prefgroove adjacent one end near the side of the anchor plate. In the case of a sleeve having'no relief,its sides would become non-planar when the sleeve is reduced and drawn along its axis. Such relief of the sleeve, as will be observed, prevents the side planes from deforming and permit the sleeve to be set firmly on the anchor plate.
  • FIG. 1 is a side view of a twisted wire coil of noncircular cross section which forms a principal part of the present invention
  • FIG. 2 is a front elevational end view of the twisted wire coil shown in FIG. 1;
  • FIG. 3 is a side sectional view of an assembled structure according to this invention before swaging, which is composed of a strand, a sleeve and the twisted wire coil shown in FIGS. 1 and 2;
  • FIG. 4 is a side sectional view of a fixed structure according to this invention following swaging of the assembly shown in FIG. 3;
  • FIG. 5 is a side sectional view of another assembled structure according to this invention before pressing, which is likewise composed of a strand, a sleeve and the twisted wire coil shown in FIGS. 1 and 2;
  • FIG. 6 is a side sectional view of the fixed structure according to this invention after pressing the assembly shown in FIG. 5;
  • FIG. 7 is a graph showing the relationship between the reduction ratio of the sleeve and the anchorage efficiency obtainable therewith;
  • FIG. 8 is a graph showing the relationship between the sleeve length and the anchorage efficiency
  • FIG. 9 is a graph showing the relationship between various friction compounds utilized in achoring wire and anchorage efficiency available therewith;
  • FIG. 10 is a side sectional view of an embodiment of an anchorage where the strands are inserted in a sleeve sleeve is formed by pressing, the sleeve has a relief having a plurality of holes and fixed therein by pressing or swaging the sleeve;
  • FIGS. 11 and 12 are side sectional views of the respective embodiments of. anchorage shown in FIGS. 3-4 and 5-6, where a-plurality of the assembled and fixed anchorages'of this invention are set on an anchor plate having plural receiving holes.
  • a helical coil 1 formed from a wire of non-circular cross section, such as, by way of example, a wire of triangular, square, polygonal, oval or the like cross section, which is twisted about its longitudinal axis prior to coil winding so that the outer face of each coil is formed by spaced narrow edge portions of the wire alternating with broad face portions, the external diameter of the coil being determined by the edge portions which radially project beyond the face portions.
  • FIG. 3 there is shown an anchor constructed according to this invention prior to deformation by forming, wherein the twisted wire coil 1 of non-circular cross section is disposed about a length of PC wire 2 and is covered by a sleeve 3 of suitable metallic material having a relief in the form of a tapered surface at one end thereof.
  • the twisted wire coil 1 has an internal coil diameter equal to or only slightly larger than the diameter of the PC wire 2
  • the sleeve 3 which may be constructed of steel or the like, has an internal diameter to just accommodate the twisted wire coil and the PC wire.
  • the sleeve 3 is reduced through a predetermined range by swaging to the form shown in FIG. 4 so that the narrow edge portions of the twisted wire coil 1 penetrate or cut into the inside surface of sleeve 3' and into the outer surface of the PC wire 2.
  • the side of the sleeve facing an anchor plate 7 retains a planar surface and also, as before, the gripping force is reduced at this end.
  • a sleeve 4 is provided with an annular relief groove 6 in place of the tapered end as shown with the sleeve 3 of FIG. 3, leaving conditions for the twisted coil 1 and PC wire 2 otherwise being the same as those for the swaging type of anchorage.
  • Compression force is applied to the longer cylindrical portion of the sleeve 4 until it assumes the state or form shown at 4 in FIG. 6.
  • the partial pressing method is more convenient for field work as a portable pressing device can be employed.
  • this invention provides an improved method of anchoring wires for prestressed concrete so as to obtain sufficient anchorage efficiency by compressing a sleeve to PC wire through twisted edged wires disposed therebetween. It has been confirmed through our experience that the sleeve length and the reduction ratio, respectively, have a close relationship with the anchorage efficiency.
  • the materials used were 0.5 in. 7-wire PC strand, and a sleeve of carbon steel containing 0.320.38% C, 0.l50.35% Si, 0.60-0.9076 Mn, max. 0.030% P and max. 0.035% S.
  • FIG. 7 shows relationship between reduction ratio and anchorage efficiency where the sleeve length is 50mm and the friction compound employed is a noncircular cross section of twisted wire coil which is annealed and cooled for the purpose of being brittled.
  • FIG. 8 the relationship between the sleeve length and anchorage efficiency is illustrated and there the reduction ratio is 21 percent and the twisted coil was used as mentioned with reference to FIG. 7.
  • FIG. 9 shows the relationship of anchorage efficiency relative to several types of friction compound under the conditions 21 percent of reduction ratio and 50mm length of sleeve.
  • the sleeve should have a length equal to two times or more the diameter of the PC wire when the reducing ratio of the sleeve is within the 10-30 percent range.
  • each PC wire 2 is anchored to the same anchor plate 7 after swaging, in the same manner as hereinbefore described.
  • the swaging type of anchorage is preferable for multi-strand anchorage as it employs an easier compressing force than the pressing type of anchorage.
  • a plurality of PC wires 2 are encased in twisted wire coils 1 of non-circular cross section and in' a steel sleeve 8 having a plurality of receiving holes, and an anchor plate 7 is positioned between the sleeve 8 and the concrete 9.
  • FIGS. 11 and 12 show embodiments where plural numbers of anchorages according to this invention as shown in FIGS. 4 and 6 are secured on the same anchor plate.
  • the PC wires 2 project through separate holes in an anchor plate 7 and are gripped separately in individual sleeves 3' through intervening twisted wire coils as hereinbefore described, the gripping having been efi'ected through swaging of the individual sleeve assemblies.
  • the PC wires 2 in the concrete 9 project through separate holes in the anchor plate 7 to be gripped in individual sleeves 4 which have been pressed to secure the same to the wires through twisted wire coils in a similar manner.
  • a method of anchoring at least one wire or strand for prestressed concrete comprising the steps of:
  • a method of anchoring a plurality of wires or strands in prestressed concrete comprising the steps of: twisting a plurality of wires having a non-circular cross sections to form coils; disposing said plurality of twisted wire coils one each in a plurality of metallic sleeves having lengths equal to at least twice the diameter of the wires or strands; sliding the sleeves containing the twisted wire coils over free ends of the respective wires or strands in the concrete to be anchored to a position adjacent an anchor plate associated with said concrete; and deforming each of said sleeves to cause said twisted wire coils therein to penetrate the interior surfaces of said sleeves and the exterior surfaces of said wires or strands and to cause said sleeves to abut said anchor plate.
  • said sleeves are deformed by swaging.
  • a method of anchoring at least one wire or strand for prestressed concrete comprising the steps of:
  • each of said twisted wire coils in a separate metallic sleeve having a length at least twice the diameter of said at least one wire or strand;
  • each of said sleeves about said at least one wire or strand to cause said twisted wire coils therein to penetrate the interior surfaces of said sleeves and the exterior surfaces of said at least one wire or strand and to provide a planar surface of contact between said sleeves and said anchoring plate through the relief of said sleeves adjacent said one end thereof adjacent said anchoring plate.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
US00150029A 1970-12-03 1971-06-04 Method of anchoring wires and strands in prestressed concrete Expired - Lifetime US3748723A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45107846A JPS5130373B1 (pt) 1970-12-03 1970-12-03

Publications (1)

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US3748723A true US3748723A (en) 1973-07-31

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US00150029A Expired - Lifetime US3748723A (en) 1970-12-03 1971-06-04 Method of anchoring wires and strands in prestressed concrete

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US (1) US3748723A (pt)
JP (1) JPS5130373B1 (pt)
CH (1) CH534282A (pt)
GB (1) GB1344375A (pt)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866273A (en) * 1972-01-21 1975-02-18 Antonio Brandestini Wire cable anchoring arrangement
US4166314A (en) * 1976-03-24 1979-09-04 Siemens Aktiengesellschaft Magnetically actuated needle printing head and method of manufacture
US4413386A (en) * 1982-01-12 1983-11-08 Soichiro Sato Connecting device for end of rope or bar and method for producing thereof
US4560424A (en) * 1983-07-06 1985-12-24 G.T.M.-Entrepose Process for forming a prestress anchorage by drawing a steel sleeve over a metal core
CN104690516A (zh) * 2015-03-20 2015-06-10 柳州市友健机械有限公司 一种扁型锚垫板的加工方法
CN104759844A (zh) * 2015-03-20 2015-07-08 柳州市友健机械有限公司 一种圆型锚垫板的加工方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124661B1 (en) * 1983-05-03 1986-08-13 SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO. LTD. An anchorage for a wire strand
GB2257444A (en) * 1991-06-28 1993-01-13 Ccl Systems Ltd Anchor grip for tendon
CN102493661B (zh) * 2011-12-30 2014-05-28 湖南大学 一种碳纤维复合绞线的粘结式锚固方法及锚具
CN103726614A (zh) * 2013-12-18 2014-04-16 柳州华威合力机械有限责任公司 挤压套
EP3610093A1 (en) * 2017-04-14 2020-02-19 Soletanche Freyssinet An anchor assembly comprising a strand and an anchor unit
CN107366431A (zh) * 2017-05-23 2017-11-21 成都智诚利合科技有限公司 一种混凝土中预埋钢筋捆扎设备的捆扎器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485699A (en) * 1949-10-25 Shielded spakk plug
US2955505A (en) * 1957-11-25 1960-10-11 Hi Shear Rivet Tool Company Pin with enlarged rib to provide prestressing
US3376060A (en) * 1964-12-14 1968-04-02 Shinko Wire Co Ltd Metallic member and joint assembly
US3579931A (en) * 1969-09-18 1971-05-25 Du Pont Method for post-tensioning tendons
US3590474A (en) * 1967-05-19 1971-07-06 Grands Travaux De Marseille Sa Method of anchoring pre-stressed wire ropes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1241157A (fr) * 1959-07-21 1960-09-16 Grands Travaux De Marseille Sa Procédé et appareil pour la réalisation de têtes d'ancrage sur un câble tendu ou non, ou sur une barre

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485699A (en) * 1949-10-25 Shielded spakk plug
US2955505A (en) * 1957-11-25 1960-10-11 Hi Shear Rivet Tool Company Pin with enlarged rib to provide prestressing
US3376060A (en) * 1964-12-14 1968-04-02 Shinko Wire Co Ltd Metallic member and joint assembly
US3590474A (en) * 1967-05-19 1971-07-06 Grands Travaux De Marseille Sa Method of anchoring pre-stressed wire ropes
US3579931A (en) * 1969-09-18 1971-05-25 Du Pont Method for post-tensioning tendons

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866273A (en) * 1972-01-21 1975-02-18 Antonio Brandestini Wire cable anchoring arrangement
US4166314A (en) * 1976-03-24 1979-09-04 Siemens Aktiengesellschaft Magnetically actuated needle printing head and method of manufacture
US4413386A (en) * 1982-01-12 1983-11-08 Soichiro Sato Connecting device for end of rope or bar and method for producing thereof
US4560424A (en) * 1983-07-06 1985-12-24 G.T.M.-Entrepose Process for forming a prestress anchorage by drawing a steel sleeve over a metal core
CN104690516A (zh) * 2015-03-20 2015-06-10 柳州市友健机械有限公司 一种扁型锚垫板的加工方法
CN104759844A (zh) * 2015-03-20 2015-07-08 柳州市友健机械有限公司 一种圆型锚垫板的加工方法

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Publication number Publication date
JPS5130373B1 (pt) 1976-08-31
CH534282A (de) 1973-02-28
GB1344375A (en) 1974-01-23

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