WO2019069389A1 - Attachment for rotating stranded wire wedge, tension kit for stranded wire, and stranded wire connection coupler - Google Patents

Attachment for rotating stranded wire wedge, tension kit for stranded wire, and stranded wire connection coupler Download PDF

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Publication number
WO2019069389A1
WO2019069389A1 PCT/JP2017/036100 JP2017036100W WO2019069389A1 WO 2019069389 A1 WO2019069389 A1 WO 2019069389A1 JP 2017036100 W JP2017036100 W JP 2017036100W WO 2019069389 A1 WO2019069389 A1 WO 2019069389A1
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WIPO (PCT)
Prior art keywords
wedge
stranded wire
wire
storage space
strand
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Application number
PCT/JP2017/036100
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French (fr)
Japanese (ja)
Inventor
俊次 蜂須賀
昌憲 軽石
大輔 眞鍋
Original Assignee
東京製綱株式会社
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Application filed by 東京製綱株式会社 filed Critical 東京製綱株式会社
Priority to PCT/JP2017/036100 priority Critical patent/WO2019069389A1/en
Publication of WO2019069389A1 publication Critical patent/WO2019069389A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
    • F16G11/04—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps
    • F16G11/044—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord
    • F16G11/048—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord by moving a surface into the cable
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing

Definitions

  • the present invention relates to an attachment for rotating a stranding wedge, a strand tensioning kit, and a stranding coupler.
  • Prestressed concrete in which a reaction force (compressive stress) of tension applied to a tendon embedded in a concrete member is applied to the concrete member.
  • a compressive stress By applying a compressive stress to the concrete member, the disadvantages of concrete whose tensile strength is lower than that of compressive strength are improved, and prestressed concrete which is strong both in compression and in tension can be obtained.
  • high tension must be applied to the tendon embedded in the concrete member. For that purpose, it is necessary to hold the end portion of the tendon stably and firmly, and it is necessary to firmly fix (fix) the fixing tool (terminal member) for realizing the holding on the end portion of the tendon.
  • Wedge fixing is known as a general method of fixing the anchor to the end portion of the tendon used in prestressed concrete.
  • Wedge anchoring uses an anchor head (sleeve) and a wedge.
  • the wedge holds the end portion of the tendon and pulls it into the anchor head.
  • Both the hollow and wedge profiles of the anchor head have a gradient, and the gradient within the hollow of the anchor head clamps the wedge in a central direction. By this clamping action, the anchor head can be firmly fixed to the end portion of the tendon via the wedge.
  • the applicant has developed a wedge (a wire wedge) in which a plurality of spiral grooves are formed on the inner surface (concave surface) to be engaged with the spiral outer peripheral surface of a wire strand used as a tension material (Patent Document 1) . Since the stranded wire is in wide contact with each of the plurality of spiral grooves formed on the inner surface, the stranded wire wedge firmly holds the stranded wire. By using the stranded wire wedge for the above-described wedge fixing, the anchor head can be more firmly fixed to the end portion of the stranded wire used as a tendon.
  • tension is applied to the tension material using a tension device (jack), and then the tension is released.
  • the wedge moves outward with the tendon and exits the hollow of the anchor head.
  • the tension is released, the wedge is pulled into the hollow of the anchor head together with the tendon.
  • set loss the difference between the tension applied to the tendon and the compressive stress applied to the prestressed concrete
  • anchor the wedge with the hydraulic piston while applying tension to the tendon It may be pushed toward the head (ie, in the opposite direction to the direction of tension).
  • the stranding wedge in which a plurality of spiral grooves are formed on the inner surface can not be moved smoothly simply by pressing.
  • the attachment for rotating the wire wedge according to the present invention has an inner surface on which a plurality of spiral grooves are formed to engage with the spiral outer peripheral surface of the stranded wire, and for the twisted wire attached to the outer peripheral surface of the stranded wire.
  • a rotating member is provided in the storage space to assist the rotation of the stranding wedge along the helical outer peripheral surface of the strand when the strand is pulled or pushed.
  • a stranding wedge is used for wedging within the anchor head (sleeve) and has a plurality of helical grooves engaged on the helical outer surface of the strand on which the stranding wedge is attached Is formed. Both the profile of the stranding wedge and the hollow of the anchor head have a slope. When the stranding wedge is pushed (pulled) into the hollow of the anchor head from its tip, the gradient clamps the stranding wedge in the central direction. When the stranding wedge is pulled firmly into the hollow of the anchor head, the stranding wire is firmly gripped by the stranding wedge and the stranding wedge is firmly fixed in the hollow of the anchor head.
  • An attachment according to the invention is provided adjacent to the anchor head.
  • the stranding wedge moves with the strand and gets out of the hollow of the anchor head.
  • the stranded wire wedge which has come out of the anchor head enters the storage space of the attachment from its large diameter end.
  • a rotating member for assisting the rotation of the stranding wedge along the helical outer peripheral surface of the strand.
  • the stranding wedge which moves with the strand by pulling or pushing the strand, directly or indirectly abuts against the rotating member in the storage space and does not move with the strand there.
  • a plurality of spiral grooves engaged with the spiral outer peripheral surface of the stranded wire are formed on the inner surface of the stranded wire wedge, the stranded wire is further pulled or pushed, the stranded wire The wedge rotates as if it were a rail, around the stranded wire in the storage space while staying in the storage space.
  • the rotation of the stranding wedge is assisted by a rotating member provided in the storage space. Based on the strand, the rotating stranding wedge moves relative to the strand relative to the anchor head, i.e., in the opposite direction to the strand's pulling or pushing direction. Since the set loss can be reduced, the tension applied to the stranded wire can be used without loss as the compressive stress applied to the prestressed concrete.
  • the stranded wire is pulled or pushed in a direction from the storage space to the through hole in front of the rotary member (between the twisted wire wedge and the rotary member) in the storage space.
  • the wire wedge is compressed by being pushed by the wire wedge which moves with the wire when being twisted, and the wire wedge is released from the through hole when the force for pulling or pushing the wire wire is released.
  • an elastic body which biases in the direction of.
  • the stranding wedge can be pushed toward the anchor head by the elastic body, the stranding wedge can be further moved toward the anchor head. Set loss can be further reduced.
  • a thrust bearing or a radial bearing is used for the rotating member provided in the storage space.
  • the rolling elements may be balls or rollers.
  • a tension kit for a stranded wire comprises an inner surface on which a plurality of helical grooves are formed to engage with the helical outer peripheral surface of the stranded wire, and a stranded wire wedge attached to the outer peripheral surface of the stranded wire;
  • the anchor head formed with a hollow into which the wire wedge is wedged, a storage space in which the large diameter end of the wire wedge is stored, and the storage space are continuous with the passage of the wire strand
  • a rotating member having a through hole having a permitted size, and assisting rotation of the stranding wedge along the spiral outer peripheral surface of the strand when the strand coming out of the through hole is tensioned; And an attachment provided in the storage space.
  • a wire wedge which has an inner surface in which a plurality of spiral grooves are formed to engage with the wire outer circumferential surface of the wire, and the wire wedge is attached to the wire outer surface;
  • a stranded wire coupling coupler coupled to a fixture comprising a hollow formed sleeve that is wedged.
  • a storage space in which the large diameter end portion of the wedge for the stranded wire is stored, and a through hole continuous with the storage space and having a size allowing passage of the stranded wire
  • An attachment provided in the storage space, the rotary member for assisting the rotation of the stranding wedge along the spiral outer peripheral surface of the strand when the strand is pushed into the storage space.
  • FIG. 7 is a longitudinal cross-sectional view showing the stranding wedge attached to the stranding being drawn into the anchor head. It is a perspective view which shows the mode of fixation of an anchor head. It is a longitudinal cross-sectional view which shows the modification of an attachment. It is a longitudinal cross-sectional view which shows the other modification of an attachment. It is a longitudinal cross-sectional view which shows the further another modification of an attachment.
  • Figure 2 shows a coupler and a sleeve connected to one end of the coupler. It is a longitudinal cross-sectional view of the coupler and sleeve which are shown in FIG. It is a longitudinal cross-sectional view which shows a mode that the strand wire is connected to the coupler.
  • FIG. 1 and FIG. 2 are a perspective view and a longitudinal sectional view showing tensioning of the stranded wire (tendon material) 1 in the post tension system.
  • FIG. 3 is a perspective view showing a stranded wire wedge which constitutes a fixing tool described later, together with the stranded wire 1.
  • FIG. 4 is an exploded perspective view of the stranding wedge shown in FIG.
  • the resin that impregnates the carbon fiber bundle 2 may be a thermosetting resin or a thermoplastic resin.
  • the cross-sectional diameter of the strand 1 is, for example, about 15.2 mm.
  • the six carbon fiber bundles 2 in the outer layer spirally extend in the longitudinal direction of the stranded wire 1 and spirally extending valleys are formed between the adjacent carbon fiber bundles 2.
  • a fixing device composed of an anchor head and a wire wedge can be provided at the other end of the wire strand 1 as described below.
  • the fixing device is composed of a metal anchor head (sleeve) 10 and a metal wire wedge 50.
  • Four strands of wire 1 go out from one end of the concrete member 60, and a wire wedge 50 is attached to each of the four strands of wire 1.
  • the stranded wire wedge 50 for gripping the stranded wire 1 is pulled into the hollow 11 of the anchor head 10, whereby the anchor head 10 is firmly fixed to the stranded wire 1 via the stranded wire wedge 50.
  • Two of the four strands 1 are shown in FIG.
  • the bearing plate 30 is installed at one end (wall surface) of the concrete member 60.
  • the bearing plate 30 is a metal plate-like member in which four through holes 31 are formed, and one stranded wire 1 is passed through each of the four through holes 31.
  • the anchor head 10 is installed such that the tip end portion contacts the surface (outer surface) of the bearing plate 30.
  • the anchor head 10 has a cylindrical outer shape, and a hollow 11 is formed in the inside from the tip opening (the side in contact with the bearing plate 30) to the end opening.
  • Four hollows 11 are formed in the anchor head 10 corresponding to the four strands 1. Two of the four hollows 11 are shown in FIG.
  • the hollow 11 has a substantially circular cross section and is formed to have a diameter gradually increasing from the tip opening to the end opening, and focusing on only the hollow 11 has a substantially frusto-conical shape.
  • Each of the four through holes 31 formed in the bearing plate 30 and each of the four hollows 11 of the anchor head 10 are formed at corresponding positions, and when the anchor head 10 is installed on the bearing plate 30, Each of the four through holes 31 of the bearing plate 30 communicates with each of the four hollows 11 of the anchor head 10.
  • Each of the stranded wires 1 coming out of the through hole 31 of the bearing plate 30 is inserted into the hollow 11 from the tip opening of the anchor head 10 and is brought out from the large end opening of the mouth.
  • a stranding wedge 50 is attached to the strand 1 drawn out of the end opening of the anchor head 10.
  • a curved concave surface 51 a in contact with the surface of the strand 1 is formed in the longitudinal direction on the inner surface of the split wedge body 51.
  • the thickness of the split wedge 51 gradually increases from the tapered tip toward the opposite large diameter end, and as shown in FIG. 3, when the two split wedges 51 are combined, the cross section There is a generally circular truncated cone shape which is generally circular and gradually thickens from the tip to the end.
  • the outer shape of the stranding wedge 50 in which the two split wedges 51 are combined approximately matches the shape of the hollow 11 of the anchor head 10.
  • As the material of the split wedge 51 spheroidal graphite cast iron excellent in strength, toughness and fatigue strength, or an austenitic or martensitic stainless alloy excellent in strength, toughness, fatigue strength and corrosion resistance can be used.
  • An engagement convex portion 54 and an engagement concave portion 55 are respectively formed on both left and right sides sandwiching the curved concave surface 51 a of the distal end portion of the split wedge body 51.
  • the engagement projection 54 of one split wedge 51 is in the engagement recess 55 of the other split wedge 51 and the engagement projection 54 of the other split wedge 51 is one Are engaged with the engagement recesses 55 of the split wedges 51 respectively. Since the relative position (relative relative position in the longitudinal direction and relative position in the circumferential direction) of the two split wedges 51 is fixed by the engagement convex portion 54 and the engagement recess 55, the twisted wire 1 is split by the two split wedges 51 It can be pinched correctly from both sides.
  • the inner surface of the split wedge 51 has a curved concave surface 51a extending in the longitudinal direction, and has a structure in which the opposite side to the curved concave surface 51a is open.
  • Wavy side walls 51c are formed on both left and right sides of the curved concave surface 51a, and the inner surface of the wavy side wall 51c also constitutes the curved concave surface 51a.
  • each of the six twisted carbon fiber bundles 2 constituting the outer layer of the stranded wire 1 has a plurality of spiral grooves 51b formed in the curved concave surface 51a. Fit in each one. Further, spirally extending ridge lines (convex lines) formed between the adjacent spiral grooves 51 b fit in spiral valleys formed between the adjacent carbon fiber bundles 2 of the twisted wire 1.
  • the surface of the stranded wire 1 can be in wide contact with the curved concave surface 51a of the split wedge 51, and each of the carbon fiber bundles 2 can be restrained by each of the spiral grooves 51b. As a result, the local force is prevented from being applied to the stranded wire 1, and the gripping force of the stranded wire 1 by the split wedge 51 is improved.
  • FIG 5 and 6 show the stranding wedge 50 attached to the stranding 1 drawn deep into the hollow 11 of the anchor head 10.
  • the stranding wedge 50 is clamped from the periphery in the central direction by the inner wall of the hollow 11 of the anchor head 10.
  • the anchor head 10 is firmly fixed (wedge-fixed) to the strand 1 via the stranding wedge 50.
  • the twisted wire 1 in a tensioning operation in which the twisted wire 1 is tightened, the twisted wire 1 is turned outward (a direction away from the wall surface of the concrete member 60) (right direction shown by an arrow in FIG. 2) It is pulled.
  • the twisted wire 1 moves in the pulled direction (tension direction, outward), and along with this, the wire wedge 50 attached to the twisted wire 1 also moves in the tension direction .
  • the stranded wire wedge 50 is gradually drawn out of the hollow 11 of the anchor head 10 and enters the storage space 21 of the attachment 20 described below.
  • An attachment (keeper plate) 20 having a storage space 21 for storing the wire wedge 50 (a large diameter end portion) drawn out of the hollow 11 of the anchor head 10 tensions the wire 1 during a tensioning operation , Between the anchor head 10 and the jack.
  • the attachment 20 is easily fixed to the anchor head 10 by an engagement protrusion or the like (not shown).
  • attachment 20 has a cylindrical outer shape, through which a relatively large diameter storage space 21 and a relatively small diameter strand 1 connected to storage space 21 are passed. Through holes 22 are provided. Both the storage space 21 and the passage hole 22 have a cylindrical shape.
  • the storage space 21 is formed to have a rotatable width for the strand wire wedge 50 and has a diameter slightly larger than the diameter of the large diameter end of the strand wire wedge 50.
  • a set of four storage spaces 21 and passage holes 22 is formed in the attachment 20 corresponding to the four strands 1. Further, at the bottom portion (the deepest position) of the storage space 21, a thrust bearing 25 described later is provided.
  • the stranding wedge 50 continues to be pulled after the stranding wedge 50 abuts on the thrust bearing 25, the stranding wedge 50 starts to rotate. That is, the wedge 50 for the stranded wire uses the six carbon fiber bundles 2 of the outer layer constituting the stranded wire 1 as a rail, that is, along the spiral outer peripheral surface of the stranded wire 1 while staying in the storage space 21 21 around the stranded wire 1
  • the rotation of the stranding wedge 50 is assisted by a thrust bearing 25 provided in the storage space 21.
  • the thrust bearing 25 provided in the storage space 21 the stranding wedge 50 can be rotated without difficulty within the storage space 21.
  • the strand 1 is tensioned 300 mm outward and tensioned.
  • the tension is loosened (relaxed)
  • the twisted wire 1 is pulled back (shrink) so as to be drawn into the hollow 11 of the anchor head 10 by about 40 mm to 50 mm.
  • Tension and relaxation can be repeated multiple times.
  • the stranding wedge 50 is drawn into the hollow 11 of the anchor head 10 as it is taken to the strand 1. In this manner, the stranding wedge 50 can be firmly fitted into the hollow 11 of the anchor head 10 while introducing tension to the stranding wire 1.
  • a thrust bearing 25 is provided in a gap formed between the main body member 26 and the cap member 27.
  • the stranding wedge 50 is pushed in the direction of the anchor head 10 (the left direction in FIG. 8) by the restoring force of the coil spring 28.
  • the restoring force of the coil spring 28 can be used as a force for pushing the wire wedge 50 into the hollow 11 of the anchor head 10. The set loss described above can be further reduced.
  • FIG. 9 shows still another modification of the attachment.
  • the thrust bearing 25 is used in order to smoothly rotate the stranded wire wedge 50 in the storage space 21 and move it relative to the stranded wire 1.
  • a radial bearing 25A is used instead of the thrust bearing.
  • a radial bearing 25A is provided at the bottom (the deepest position) of the storage space 21.
  • the radial bearing 25A includes an inner ring and an outer ring, and rolling elements (balls) sandwiched between the inner ring and the outer ring, and can rotate only the inner ring while the outer ring is stationary.
  • the outer ring of the radial bearing 25A is fixed to the cap member 27 by the ring member 24a.
  • a substantially cylindrical rotating body 23 is fixed to the inner ring of the radial bearing 25A via a ring member 24b.
  • the cylindrical rotor 23 also rotates.
  • the coil spring 28 and the contact ring member 29 are provided in the storage space 21 in the same manner as the attachment 20B (FIG. 8) described above.
  • the stranding wedge 50 moves together with the strand 1 together.
  • the end face of the wire wedge 50 abuts on the contact ring member 29 and the coil spring 28 is contracted.
  • the radial bearing 25A (its inner ring), the cylindrical rotating body 23, the coil spring 28, the contact ring member 29, and the wire wedge 50 start to rotate.
  • the stranding wedge 50 moves relative to the strand 1 in the direction opposite to the direction of tension of the strand 1.
  • the restoring force of the coil spring 28 is used as a force for pushing the wire wedge 50 into the hollow 11 of the anchor head 10.
  • FIG. 10 schematically shows how the twisted wire 1 is tensioned in the pretensioning method.
  • the stranded wire 1 stretched on an elongated production stand (bed) 75 is tensioned. Concrete (indicated by the broken line 7) is cast in such a way that the strained strand 1 is embedded. Thereafter, by releasing the tension of the strand 1, prestress is introduced to the concrete member 7. While the above-described post-tensioning method is suitable for work at a construction site, the pre-tensioning method is performed at a manufacturing plant of the concrete member 7.
  • Couplers (connection fittings) 80 are attached to both ends of the stranded wire 1 respectively.
  • the coupler 80 is for connecting (connecting) the stranded wire 1 (CFRP cable) and the PC steel wire 71, the details of which will be described later.
  • a PC steel wire 71 connected to each of the two couplers 80 is locked to the reaction stand 72.
  • a jack 73 is provided on one reaction plate 72, and the PC steel wire 71 is pulled by the jack 73. As a result, the stranded wire 1 sandwiched by the two couplers 80 is tensioned.
  • the length of the stranded wire 1 not disposed in the concrete member 7 and disposed of for disposal will be long.
  • the coupler 80 it is possible to reduce (shorten) the stranded wire 1 to be disposed of.
  • coupler 80 has a cylindrical outer shape, and has a relatively large diameter cylindrical internal space 85 and a relatively small diameter cylindrical penetration connected to internal space 85 therein. It is provided with a hole 86.
  • the inner space 85 side is referred to as one end of the coupler 80
  • the through hole 86 side is referred to as the other end of the coupler 80.
  • the sleeve 10A is connected to one end of the coupler 80 by screwing.
  • the sleeve 10A has substantially the same shape as the anchor head 10 described above, and a hollow 11 having a substantially frusto-conical shape is formed inside, and the wire wedge 50 is fitted in the hollow 11.
  • the attachment 20C (see FIG. 9) described above is fixedly provided on one end side of the internal space 85 of the coupler 80, and the sleeve 83 for the PC steel wire 71 is fixedly provided on the other end side. There is.
  • the wedge 84 sandwiching the end of the PC steel wire 71 is tightly fitted in the hollow of the sleeve 83, the end of the PC steel wire 71 is wedged to the other end of the coupler 80 and the other end of the coupler 80 is The PC steel wire 71 is connected.
  • the stranded wire 1 when connecting the stranded wire 1 to one end of the coupler 80, the stranded wire 1 is pushed into the sleeve 10A from the small end opening of the mouth of the sleeve 10A.
  • the stranded wire 1 slightly penetrates into the stranded wire wedge 50 (between the two split wedges 51) (see FIGS. 3 and 4) provided on the sleeve 10A, but as described above, the split wedges 51 are Since the spiral groove 51b is formed in the curved concave surface 51a, the twisted wire 1 can not be passed straight as it is through the twisted wire wedge 50 (between the two split wedges 51).
  • the attachment 20C can also be used to connect the stranded wire 1 to the coupler 80.
  • the strand 1 After the strand 1 passes completely through the strand wedge 50 and reaches the coupler 80, as described above, the strand 1 is tensioned using the jack 73 (FIG. 10).

Abstract

A stranded wire wedge (50), an anchor head (10), and an attachment (20, 20A, 20B, 20C) are used when tensioning a stranded wire. The stranded wire wedge (50) has an inner surface where a plurality of helical grooves (51b) for engaging with the helical outer peripheral surface of the stranded wire is formed, the stranded wire wedge (50) being attached to the outer peripheral surface of the stranded wire. The anchor head (10) has a hollow portion (11) in which the stranded wire wedge (50) is wedged. The attachment (20, 20A, 20B, 20C) has: an accommodation space (21) in which the large-diameter end portion of the stranded wire wedge (50) is accommodated; and a through hole (22) connected to the accommodation space (21) and having a dimension allowing the stranded wire to pass therethrough, wherein a rotating member (25, 25A) for assisting the rotation of the stranded wire wedge (50) along the helical outer peripheral surface of the stranded wire when the stranded wire (1) coming out from the through hole (22) is tensioned is provided in the accommodation space (21).

Description

撚り線用くさびを回転させるアタッチメント，撚り線の緊張キット，および撚り線接続カプラAttachments for rotating stranded wire wedges, stranded wire tension kits, and stranded wire connection couplers
　この発明は，撚り線用くさびを回転させるアタッチメント，撚り線の緊張キット，および撚り線接続カプラに関する。 The present invention relates to an attachment for rotating a stranding wedge, a strand tensioning kit, and a stranding coupler.
　コンクリート部材内に埋込まれた緊張材に与えられる緊張力の反力（圧縮応力）をコンクリート部材に付与したプレストレストコンクリートが知られている。コンクリート部材に圧縮応力を付与することで，引張強度が圧縮強度よりも低いコンクリートの欠点が改善され，圧縮にも引張にも強いプレストレストコンクリートが得られる。プレストレストコンクリートを得るには，コンクリート部材内に埋込まれる緊張材に高い緊張力を加えなければならない。そのためには緊張材の末端部分を安定かつ強固に把持する必要があり，その把持を実現する定着具（端末部材）を緊張材の末端部分にしっかりと定着（固定）する必要がある。 Prestressed concrete is known in which a reaction force (compressive stress) of tension applied to a tendon embedded in a concrete member is applied to the concrete member. By applying a compressive stress to the concrete member, the disadvantages of concrete whose tensile strength is lower than that of compressive strength are improved, and prestressed concrete which is strong both in compression and in tension can be obtained. To obtain prestressed concrete, high tension must be applied to the tendon embedded in the concrete member. For that purpose, it is necessary to hold the end portion of the tendon stably and firmly, and it is necessary to firmly fix (fix) the fixing tool (terminal member) for realizing the holding on the end portion of the tendon.
　プレストレストコンクリートに用いられる緊張材の末端部分に定着具を定着する一般的な方法としてくさび定着が知られている。くさび定着ではアンカーヘッド（スリーブ）とくさびとが用いられる。くさびによって緊張材の末端部分を挟み，これをアンカーヘッド内に引き込む。アンカーヘッドの中空およびくさびの外形はいずれも勾配を有しており，アンカーヘッドの中空内の勾配によってくさびが中心方向に締め付けられる。この締め付け作用によって，くさびを介して，緊張材の末端部分に強固にアンカーヘッドを定着することができる。 Wedge fixing is known as a general method of fixing the anchor to the end portion of the tendon used in prestressed concrete. Wedge anchoring uses an anchor head (sleeve) and a wedge. The wedge holds the end portion of the tendon and pulls it into the anchor head. Both the hollow and wedge profiles of the anchor head have a gradient, and the gradient within the hollow of the anchor head clamps the wedge in a central direction. By this clamping action, the anchor head can be firmly fixed to the end portion of the tendon via the wedge.
　出願人は，緊張材として用いられる撚り線のらせん状外周面に係合するらせん状の複数の溝が内面（凹面）に形成されたくさび（撚り線用くさび）を開発した（特許文献１）。内面に形成されたらせん状の複数の溝のそれぞれに撚り線が広く接触するので，撚り線用くさびは撚り線を強固に把持する。撚り線用くさびを上述したくさび定着に用いることで，緊張材として用いられる撚り線の末端部分にアンカーヘッドをより強固に定着することができる。 The applicant has developed a wedge (a wire wedge) in which a plurality of spiral grooves are formed on the inner surface (concave surface) to be engaged with the spiral outer peripheral surface of a wire strand used as a tension material (Patent Document 1) . Since the stranded wire is in wide contact with each of the plurality of spiral grooves formed on the inner surface, the stranded wire wedge firmly holds the stranded wire. By using the stranded wire wedge for the above-described wedge fixing, the anchor head can be more firmly fixed to the end portion of the stranded wire used as a tendon.
意匠登録第１５５６４６５号公報Design Registration No. 1556465
　緊張材の緊張作業では，緊張装置（ジャッキ）を用いて緊張材に緊張力を与え，その後に緊張力が開放される。緊張材に緊張力を与えているとき，くさびは緊張材とともに外方に移動しアンカーヘッドの中空から一旦抜け出す。緊張力を開放するとくさびは緊張材とともにアンカーヘッドの中空に引き込まれる。セットロス（緊張材に与えられる緊張力とプレストレストコンクリートに与えられる圧縮応力の差）（プレストレスの損失）を小さくするために，緊張材に緊張力を与えているときにくさびを油圧ピストンでアンカーヘッドに向けて（すなわち緊張方向と反対向きに）押し込むことがある。しかしながら，らせん状の複数の溝が内面に形成された撚り線用くさびは，単に押し込むだけではスムーズに移動させることができない。 In the tension work of the tension material, tension is applied to the tension material using a tension device (jack), and then the tension is released. When applying tension to the tendon, the wedge moves outward with the tendon and exits the hollow of the anchor head. When the tension is released, the wedge is pulled into the hollow of the anchor head together with the tendon. To reduce set loss (the difference between the tension applied to the tendon and the compressive stress applied to the prestressed concrete) (loss of prestress), anchor the wedge with the hydraulic piston while applying tension to the tendon It may be pushed toward the head (ie, in the opposite direction to the direction of tension). However, the stranding wedge in which a plurality of spiral grooves are formed on the inner surface can not be moved smoothly simply by pressing.
　この発明は，撚り線のらせん状外周面に係合するらせん状の複数の溝が内面に形成された撚り線用くさびを，撚り線の移動方向（引張方向または押し込み方法）と反対向きに，スムーズに，撚り線に沿って移動させることができるようにすることを目的とする。 According to the present invention, the stranding wedge having a plurality of helical grooves formed on the inner surface to be engaged with the helical outer peripheral surface of the strand in the direction opposite to the strand moving direction (tension direction or pushing method), The purpose is to be able to move smoothly along the stranded wire.
　この発明による撚り線用くさびを回転させるアタッチメントは，撚り線のらせん状外周面に係合するらせん状の複数の溝が形成された内面を備え，上記撚り線の外周面に取り付けられる撚り線用くさびの大径の末端部が収納される収納空間と，上記収納空間に連続し，上記撚り線の通過を許す寸法を有する貫通孔とを備え，上記収納空間から上記貫通孔への向きに上記撚り線が引っ張られたまたは押し込まれたときに，上記撚り線のらせん状外周面に沿う上記撚り線用くさびの回転を補助する回転部材が上記収納空間内に設けられているものである。 The attachment for rotating the wire wedge according to the present invention has an inner surface on which a plurality of spiral grooves are formed to engage with the spiral outer peripheral surface of the stranded wire, and for the twisted wire attached to the outer peripheral surface of the stranded wire. A storage space in which the large diameter end of the wedge is stored, and a through hole which is continuous with the storage space and has a dimension permitting passage of the stranded wire, and the storage space is directed from the storage space to the through hole. A rotating member is provided in the storage space to assist the rotation of the stranding wedge along the helical outer peripheral surface of the strand when the strand is pulled or pushed.
　撚り線用くさびはアンカーヘッド（スリーブ）内にくさび止めするために用いられるもので，その内面に，撚り線用くさびが取り付けられる撚り線のらせん状外周面に係合するらせん状の複数の溝が形成されている。撚り線用くさびの外形およびアンカーヘッドの中空はいずれも勾配を持つ。撚り線用くさびがその先端部からアンカーヘッドの中空内に押し込まれる（引き込まれる）と，勾配によって撚り線用くさびが中心方向に締め付けられる。撚り線用くさびがアンカーヘッドの中空内に強く引き込まれると，撚り線が撚り線用くさびによってしっかりと把持され，撚り線用くさびがアンカーヘッドの中空内にしっかりと固定される。 A stranding wedge is used for wedging within the anchor head (sleeve) and has a plurality of helical grooves engaged on the helical outer surface of the strand on which the stranding wedge is attached Is formed. Both the profile of the stranding wedge and the hollow of the anchor head have a slope. When the stranding wedge is pushed (pulled) into the hollow of the anchor head from its tip, the gradient clamps the stranding wedge in the central direction. When the stranding wedge is pulled firmly into the hollow of the anchor head, the stranding wire is firmly gripped by the stranding wedge and the stranding wedge is firmly fixed in the hollow of the anchor head.
　この発明によるアタッチメントは上記アンカーヘッドに隣接して設けられる。アンカーヘッドの外に出ている撚り線を外向きに引っ張るまたは押し込むと，撚り線用くさびは撚り線とともに移動し，アンカーヘッドの中空から抜け出る。アンカーヘッドから抜け出た撚り線用くさびは，その大径の末端部からアタッチメントの収納空間に入っていく。 An attachment according to the invention is provided adjacent to the anchor head. When the strand coming out of the anchor head is pulled outward or pushed in, the stranding wedge moves with the strand and gets out of the hollow of the anchor head. The stranded wire wedge which has come out of the anchor head enters the storage space of the attachment from its large diameter end.
　この発明によると，アタッチメントの収納空間内に，撚り線のらせん状外周面に沿う上記撚り線用くさびの回転を補助する回転部材が設けられている。撚り線を引っ張るまたは押し込むことによって撚り線とともに移動する撚り線用くさびは，収納空間内において上記回転部材に直接にまたは間接に当接し，そこで撚り線と一緒には移動しなくなる。ここで上述のように，撚り線用くさびの内面には撚り線のらせん状外周面に係合するらせん状の複数の溝が形成されているので，撚り線をさらに引っ張るまたは押し込むと，撚り線用くさびは，撚り線をあたかもレールにして，収納空間にとどまりつつ，収納空間内において撚り線の周囲を回転する。この撚り線用くさびの回転が収納空間に設けられた回転部材によって補助される。撚り線を基準にすると，回転する撚り線用くさびは，撚り線に対して相対的にアンカーヘッドに向けて，すなわち撚り線の引張方向または押し込み方向と反対方向に，移動することになる。セットロスを小さくすることができるので，撚り線に与えられる緊張力を，プレストレストコンクリートに与えられる圧縮応力として無駄なく利用することができる。 According to the present invention, in the storage space of the attachment, there is provided a rotating member for assisting the rotation of the stranding wedge along the helical outer peripheral surface of the strand. The stranding wedge, which moves with the strand by pulling or pushing the strand, directly or indirectly abuts against the rotating member in the storage space and does not move with the strand there. Here, as described above, since a plurality of spiral grooves engaged with the spiral outer peripheral surface of the stranded wire are formed on the inner surface of the stranded wire wedge, the stranded wire is further pulled or pushed, the stranded wire The wedge rotates as if it were a rail, around the stranded wire in the storage space while staying in the storage space. The rotation of the stranding wedge is assisted by a rotating member provided in the storage space. Based on the strand, the rotating stranding wedge moves relative to the strand relative to the anchor head, i.e., in the opposite direction to the strand's pulling or pushing direction. Since the set loss can be reduced, the tension applied to the stranded wire can be used without loss as the compressive stress applied to the prestressed concrete.
　一実施態様では，上記収納空間内の上記回転部材の前方（上記撚り線用くさびと上記回転部材の間）に，上記撚り線が上記収納空間から上記貫通孔への向きに引っ張られたまたは押し込まれたときに上記撚り線とともに移動する上記撚り線用くさびによって押されることで圧縮され，かつ上記撚り線を引っ張るまたは押し込む力を開放したときに上記撚り線用くさびを上記貫通孔から上記収納空間への向きに付勢する弾性体がさらに設けられている。 In one embodiment, the stranded wire is pulled or pushed in a direction from the storage space to the through hole in front of the rotary member (between the twisted wire wedge and the rotary member) in the storage space. The wire wedge is compressed by being pushed by the wire wedge which moves with the wire when being twisted, and the wire wedge is released from the through hole when the force for pulling or pushing the wire wire is released. There is further provided an elastic body which biases in the direction of.
　弾性体によって撚り線用くさびをアンカーヘッドに向けて押すことができるので，撚り線用くさびをアンカーヘッドに向けてさらに移動させることができる。セットロスをさらに小さくすることができる。 Since the stranding wedge can be pushed toward the anchor head by the elastic body, the stranding wedge can be further moved toward the anchor head. Set loss can be further reduced.
　上記収納空間内に設けられる回転部材には，一実施態様ではスラスト・ベアリングまたはラジアル・ベアリングが用いられる。転動体は玉であってもころであってもよい。 In one embodiment, a thrust bearing or a radial bearing is used for the rotating member provided in the storage space. The rolling elements may be balls or rollers.
　この発明による撚り線の緊張キットは，撚り線のらせん状外周面に係合するらせん状の複数の溝が形成された内面を備え，撚り線の外周面に取り付けられる撚り線用くさびと，上記撚り線用くさびがくさび止めされる中空が形成されたアンカーヘッドと，上記撚り線用くさびの大径の末端部が収納される収納空間，および上記収納空間に連続し，上記撚り線の通過を許す寸法を有する貫通孔を備え，上記貫通孔から外に出ている上記撚り線を緊張したときに，上記撚り線のらせん状外周面に沿う上記撚り線用くさびの回転を補助する回転部材が上記収納空間内に設けられているアタッチメントと，を備えている。 A tension kit for a stranded wire according to the present invention comprises an inner surface on which a plurality of helical grooves are formed to engage with the helical outer peripheral surface of the stranded wire, and a stranded wire wedge attached to the outer peripheral surface of the stranded wire; The anchor head formed with a hollow into which the wire wedge is wedged, a storage space in which the large diameter end of the wire wedge is stored, and the storage space are continuous with the passage of the wire strand A rotating member having a through hole having a permitted size, and assisting rotation of the stranding wedge along the spiral outer peripheral surface of the strand when the strand coming out of the through hole is tensioned; And an attachment provided in the storage space.
　上記アタッチメントの収納空間内に撚り線のらせん状外周面に沿う撚り線用くさびの回転を補助する回転部材が設けられているので，貫通孔から外に出ている撚り線を緊張したときに，収納空間内において，撚り線用くさびを撚り線の周囲において回転させ，かつ撚り線に対して相対的にアンカーヘッドに向けて移動させることができる。撚り線の緊張セットは，プレストレストコンクリートへの適用，特にポストテンション方式によってプレストレスが加えられるプレストレストコンクリートに適するものである。セットロスを小さくすることができるので，撚り線に与えられる緊張力をプレストレストコンクリートに与えられる圧縮応力として無駄なく利用することができる。 Since the rotation member for assisting the rotation of the wire wedge along the helical outer peripheral surface of the wire is provided in the storage space of the attachment, when the wire outside the through hole is tensioned, In the storage space, the stranding wedge can be rotated around the strand and moved relative to the strand towards the anchor head. Strand tension sets are suitable for application to prestressed concrete, in particular prestressed concrete that is prestressed by the post tension method. Since the set loss can be reduced, the tension applied to the stranded wire can be used without loss as the compressive stress applied to the prestressed concrete.
　この発明は，撚り線のらせん状外周面に係合するらせん状の複数の溝が形成された内面を備え，上記撚り線の外周面に取り付けられる撚り線用くさびと，上記撚り線用くさびがくさび止めされる中空が形成されたスリーブとを備える定着具が連結される撚り線接続カプラも提供する。この発明によるカプラは，上記カプラ内に，上記撚り線用くさびの大径の末端部が収納される収納空間，および上記収納空間に連続し，上記撚り線の通過を許す寸法を有する貫通孔を備え，上記撚り線を上記収納空間に向けて押し込んだときに，上記撚り線のらせん状外周面に沿う上記撚り線用くさびの回転を補助する回転部材が上記収納空間内に設けられているアタッチメントが設けられているものである。 According to the present invention, there is provided a wire wedge which has an inner surface in which a plurality of spiral grooves are formed to engage with the wire outer circumferential surface of the wire, and the wire wedge is attached to the wire outer surface; There is also provided a stranded wire coupling coupler coupled to a fixture comprising a hollow formed sleeve that is wedged. In the coupler according to the present invention, a storage space in which the large diameter end portion of the wedge for the stranded wire is stored, and a through hole continuous with the storage space and having a size allowing passage of the stranded wire An attachment provided in the storage space, the rotary member for assisting the rotation of the stranding wedge along the spiral outer peripheral surface of the strand when the strand is pushed into the storage space. Is provided.
　撚り線用くさびおよびスリーブを備える定着具に連結されるカプラ内に，上述したアタッチメントが設けられる。アタッチメントの収納空間内に撚り線のらせん状外周面に沿う撚り線用くさびの回転を補助する回転部材が設けられているので，スリーブから外に出ている撚り線をカプラに向けて押し込むと，撚り線用くさびが回転する。撚り線は回転する撚り線用くさびの中を次第にカプラに向けて移動し，撚り線にカプラを接続することができる。撚り線とＰＣ鋼線とをつなげたり，撚り線同士を連結したりするためにカプラを用いることができる。この発明によるカプラは，プレテンション方式によって撚り線を緊張するときに用いることができる。 The attachment described above is provided in a coupler coupled to a fuser comprising a stranded wire wedge and a sleeve. Since a rotating member for assisting the rotation of the wire wedge along the helical outer peripheral surface of the wire is provided in the storage space of the attachment, when the wire wire coming out from the sleeve is pushed toward the coupler, The twisted wire wedge rotates. The strand can move progressively towards the coupler in the rotating strand wedge and connect the coupler to the strand. A coupler can be used to connect the stranded wire and the PC steel wire or to connect the stranded wires. The coupler according to the present invention can be used when the twisted wire is tensioned by the pretension method.
ポストテンション方式において撚り線を緊張している様子を示す斜視図である。It is a perspective view which shows a mode that the strand wire is tensed in a post tension system. ポストテンション方式において撚り線を緊張している様子を示す縦断面図である。It is a longitudinal cross-sectional view which shows a mode that the strand wire is tensed in a post tension system. 撚り線用くさびの斜視図である。It is a perspective view of the wire wedge. 撚り線用くさびの分解斜視図である。It is a disassembled perspective view of the wire wedge. 撚り線に取り付けられた撚り線用くさびがアンカーヘッド内に引き込まれる様子を示す縦断面図である。FIG. 7 is a longitudinal cross-sectional view showing the stranding wedge attached to the stranding being drawn into the anchor head. アンカーヘッドの定着の様子を示す斜視図である。It is a perspective view which shows the mode of fixation of an anchor head. アタッチメントの変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of an attachment. アタッチメントの他の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the other modification of an attachment. アタッチメントのさらに他の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the further another modification of an attachment. プレテンション方式において撚り線を緊張している様子を示す。The tension is shown in the pretension method. カプラおよびカプラの一端に連結されたスリーブを示す。Figure 2 shows a coupler and a sleeve connected to one end of the coupler. 図１１に示すカプラおよびスリーブの縦断面図である。It is a longitudinal cross-sectional view of the coupler and sleeve which are shown in FIG. カプラに撚り線を接続している様子を示す縦断面図である。It is a longitudinal cross-sectional view which shows a mode that the strand wire is connected to the coupler.
　図１および図２は，ポストテンション方式において撚り線（緊張材）１を緊張している様子を示す斜視図および縦断面図である。図３は後述する定着具を構成する撚り線用くさびを撚り線１とともに示す斜視図である。図４は図３に示す撚り線用くさびの分解斜視図である。 FIG. 1 and FIG. 2 are a perspective view and a longitudinal sectional view showing tensioning of the stranded wire (tendon material) 1 in the post tension system. FIG. 3 is a perspective view showing a stranded wire wedge which constitutes a fixing tool described later, together with the stranded wire 1. FIG. 4 is an exploded perspective view of the stranding wedge shown in FIG.
　コンクリート部材60の一端部から他端部にかけて埋設された細長いシース（図示略）内に撚り線１が通されている。撚り線１は，この実施例では炭素繊維強化プラスチック（ＣＦＲＰ）製のケーブル（炭素繊維複合ケーブル：Carbon Fiber Composite Cableと呼ぶこともできる）であり，複数本の連続する炭素繊維にエポキシ樹脂を含侵させた複合材を材料とする，断面円形の７本の炭素繊維強化プラスチック製の炭素繊維束２をより合わせて１×７構造（１本の炭素繊維束２を中心にして，その周囲の外層に６本の炭素繊維束２を撚り合わせた構造）としたものである。炭素繊維に代えて，ガラス繊維，ボロン繊維，アラミド繊維，ポリエチレン繊維，ＰＢＯ（Polyp-phenylenebebzobisoxazole）繊維，その他の繊維を用いてもよい。エポキシ樹脂に代えてポリアミドその他の樹脂を用いてもよい。炭素繊維束２に含侵する樹脂は熱硬化性樹脂であっても熱可塑性樹脂であってもよい。撚り線１の断面直径はたとえば約15.2mmである。外層の６本の炭素繊維束２は撚り線１の長手方向にらせん状にのびており，隣り合う炭素繊維束２の間にはらせん状にのびる谷部が形成される。 The stranded wire 1 is passed through an elongated sheath (not shown) embedded from one end to the other end of the concrete member 60. Stranded wire 1 is a cable made of carbon fiber reinforced plastic (CFRP) in this embodiment (carbon fiber composite cable: can also be called Carbon Fiber Composite Cable), and an epoxy resin is contained in a plurality of continuous carbon fibers. A cross section of seven carbon fiber reinforced plastic carbon fiber bundles 2 made of an infiltrated composite material is combined to form a 1 × 7 structure (with one carbon fiber bundle 2 as a center, the periphery thereof A structure in which six carbon fiber bundles 2 are twisted together in the outer layer). In place of carbon fibers, glass fibers, boron fibers, aramid fibers, polyethylene fibers, PBO (Polyp-phenylenebebzobis oxazole) fibers, and other fibers may be used. Instead of epoxy resin, polyamide or other resin may be used. The resin that impregnates the carbon fiber bundle 2 may be a thermosetting resin or a thermoplastic resin. The cross-sectional diameter of the strand 1 is, for example, about 15.2 mm. The six carbon fiber bundles 2 in the outer layer spirally extend in the longitudinal direction of the stranded wire 1 and spirally extending valleys are formed between the adjacent carbon fiber bundles 2.
　後述するように撚り線１を外向きに引っ張ることで撚り線１が緊張され（緊張力が与えられ），その状態で撚り線１が通されたシース内にグラウト材が充填される。撚り線１に対する緊張はその後開放される。撚り線１に与えられた緊張力の反力（圧縮応力）によってコンクリート部材60にプレストレスが導入される（コンクリート部材60がプレストレストコンクリートと呼ばれるものとなる）。プレストレスが導入されたコンクリート部材60は高品質かつ耐久性に富むものとなる。 As described later, by pulling the twisted wire 1 outward, the twisted wire 1 is tensioned (a tension is given), and in that state, the grout material is filled in the sheath through which the twisted wire 1 is passed. The tension on the strand 1 is then released. Prestress is introduced to the concrete member 60 by the reaction force (compression stress) of the tension applied to the stranded wire 1 (the concrete member 60 becomes what is called prestressed concrete). The prestressed concrete member 60 has high quality and durability.
　以下，引っ張られる撚り線１の一端部の様子を説明する。図示を省略する撚り線１の他端部は，一端部において撚り線１を引っ張ったときに撚り線１がコンクリート部材60から抜け出てしまわないように定着具によってしっかりと把持される。以下に説明するアンカーヘッドおよび撚り線用くさびから構成される定着具を，撚り線１の他端部に設けることができる。 Hereinafter, the appearance of one end of the stranded wire 1 to be pulled will be described. The other end of the stranded wire 1 (not shown) is firmly gripped by the fixing tool so that the stranded wire 1 does not slip out of the concrete member 60 when the stranded wire 1 is pulled at one end. A fixing device composed of an anchor head and a wire wedge can be provided at the other end of the wire strand 1 as described below.
　図１および図２を参照して，定着具は，金属製のアンカーヘッド（スリーブ）10と金属製の撚り線用くさび50とから構成される。コンクリート部材60の一端部から４本の撚り線１が外に出ており，この４本の撚り線１のそれぞれに撚り線用くさび50が取り付けられる。撚り線１を把持する撚り線用くさび50がアンカーヘッド10の中空11に引き込まれることで，アンカーヘッド10が撚り線用くさび50を介して撚り線１に強固に定着する。図２には４本の撚り線１のうちの２本が示されている。 Referring to FIGS. 1 and 2, the fixing device is composed of a metal anchor head (sleeve) 10 and a metal wire wedge 50. Four strands of wire 1 go out from one end of the concrete member 60, and a wire wedge 50 is attached to each of the four strands of wire 1. The stranded wire wedge 50 for gripping the stranded wire 1 is pulled into the hollow 11 of the anchor head 10, whereby the anchor head 10 is firmly fixed to the stranded wire 1 via the stranded wire wedge 50. Two of the four strands 1 are shown in FIG.
　はじめに，コンクリート部材60の一端部（壁面）に支圧板30が設置される。支圧板30は４つの貫通孔31が形成された金属製の板状部材であり，４つの貫通孔31のそれぞれに撚り線１が１本ずつ通される。 First, the bearing plate 30 is installed at one end (wall surface) of the concrete member 60. The bearing plate 30 is a metal plate-like member in which four through holes 31 are formed, and one stranded wire 1 is passed through each of the four through holes 31.
　支圧板30の表面（外面）に先端部分が接するようにしてアンカーヘッド10が設置される。アンカーヘッド10は円筒状の外形を有するもので，その内部に先端開口（支圧板30に接する側）から末端開口にかけて中空11が形成されている。４本の撚り線１に対応して４つの中空11がアンカーヘッド10には形成されている。図２には４つの中空11のうちの２つが示されている。 The anchor head 10 is installed such that the tip end portion contacts the surface (outer surface) of the bearing plate 30. The anchor head 10 has a cylindrical outer shape, and a hollow 11 is formed in the inside from the tip opening (the side in contact with the bearing plate 30) to the end opening. Four hollows 11 are formed in the anchor head 10 corresponding to the four strands 1. Two of the four hollows 11 are shown in FIG.
　中空11は横断面がほぼ円形でありかつ先端開口から末端開口にかけて直径が次第に大きくなるように形成され，中空11のみに着目すると概略円錐台形状の形状を有している。支圧板30に形成された４つの貫通孔31のそれぞれと，アンカーヘッド10の４つの中空11のそれぞれとは対応する位置に形成されており，支圧板30にアンカーヘッド10が設置されると，支圧板30の４つの貫通孔31のそれぞれとアンカーヘッド10の４つの中空11のそれぞれとが連通する。 The hollow 11 has a substantially circular cross section and is formed to have a diameter gradually increasing from the tip opening to the end opening, and focusing on only the hollow 11 has a substantially frusto-conical shape. Each of the four through holes 31 formed in the bearing plate 30 and each of the four hollows 11 of the anchor head 10 are formed at corresponding positions, and when the anchor head 10 is installed on the bearing plate 30, Each of the four through holes 31 of the bearing plate 30 communicates with each of the four hollows 11 of the anchor head 10.
　支圧板30の貫通孔31から外に出ている撚り線１のそれぞれは，アンカーヘッド10の先端開口から中空11内に挿入され，口の大きい末端開口から外に出される。アンカーヘッド10の末端開口から外に出された撚り線１に，撚り線用くさび50が取り付けられる。 Each of the stranded wires 1 coming out of the through hole 31 of the bearing plate 30 is inserted into the hollow 11 from the tip opening of the anchor head 10 and is brought out from the large end opening of the mouth. A stranding wedge 50 is attached to the strand 1 drawn out of the end opening of the anchor head 10.
　図３および図４を参照して，撚り線用くさび50は，たとえば175mmの全長を持つ２つの細長い分割くさび体51から構成され，２つの分割くさび体51によって撚り線１が部分的に覆われる。２つの分割くさび体51は同一形状および大きさを有しており，たとえば鋳型成形によってつくられる。 Referring to FIGS. 3 and 4, stranding wedge 50 is formed of, for example, two elongated split wedges 51 having a total length of 175 mm, and strand 1 is partially covered by two split wedges 51. . The two split wedges 51 have the same shape and size and are produced, for example, by moulding.
　図４を参照して，分割くさび体51の内面に，撚り線１の表面に接する湾曲凹面51ａが長手方向に形成されている。分割くさび体51の肉厚は先細の先端部から反対側の大径の末端部に向かうにしたがって次第に厚くなっており，図３に示すように，２つの分割くさび体51を組み合わせると，横断面が概略円形でかつ先端部から末端部に向けて次第に太くなる概略円錐台形状となる。２つの分割くさび体51を組み合わせた撚り線用くさび50の外形は，アンカーヘッド10の中空11の形状とおおよそ一致する。分割くさび体51の材料には，強度，靭性および疲労強度に優れた球状黒鉛鋳鉄，または強度，靭性，疲労強度および防食性に優れたオーステナイト系若しくはマルサイト系のステンレス合金を用いることができる。 Referring to FIG. 4, a curved concave surface 51 a in contact with the surface of the strand 1 is formed in the longitudinal direction on the inner surface of the split wedge body 51. The thickness of the split wedge 51 gradually increases from the tapered tip toward the opposite large diameter end, and as shown in FIG. 3, when the two split wedges 51 are combined, the cross section There is a generally circular truncated cone shape which is generally circular and gradually thickens from the tip to the end. The outer shape of the stranding wedge 50 in which the two split wedges 51 are combined approximately matches the shape of the hollow 11 of the anchor head 10. As the material of the split wedge 51, spheroidal graphite cast iron excellent in strength, toughness and fatigue strength, or an austenitic or martensitic stainless alloy excellent in strength, toughness, fatigue strength and corrosion resistance can be used.
　分割くさび体51の末端部の湾曲凹面51ａを挟む左右の両側のそれぞれに，係合凸部54と係合凹部55とがそれぞれ形成されている。２つの分割くさび体51を組み合わせると，一方の分割くさび体51の係合凸部54が他方の分割くさび体51の係合凹部55に，他方の分割くさび体51の係合凸部54が一方の分割くさび体51の係合凹部55に，それぞれ係合する。係合凸部54および係合凹部55によって２つの分割くさび体51の相対位置（長手方向の相対位置および周方向の相対位置）が固定されるので，撚り線１を２つの分割くさび体51によって両側から正確に挟むことができる。 An engagement convex portion 54 and an engagement concave portion 55 are respectively formed on both left and right sides sandwiching the curved concave surface 51 a of the distal end portion of the split wedge body 51. When two split wedges 51 are combined, the engagement projection 54 of one split wedge 51 is in the engagement recess 55 of the other split wedge 51 and the engagement projection 54 of the other split wedge 51 is one Are engaged with the engagement recesses 55 of the split wedges 51 respectively. Since the relative position (relative relative position in the longitudinal direction and relative position in the circumferential direction) of the two split wedges 51 is fixed by the engagement convex portion 54 and the engagement recess 55, the twisted wire 1 is split by the two split wedges 51 It can be pinched correctly from both sides.
　図４を参照して，上述したように，分割くさび体51の内面は長手方向にのびる湾曲凹面51ａを有しており，湾曲凹面51ａと反対側が開口する構造を持つ。湾曲凹面51ａの左右の両側には波状の側壁部51ｃが形成されており，波状の側壁部51ｃの内面も湾曲凹面51ａを構成する。 Referring to FIG. 4, as described above, the inner surface of the split wedge 51 has a curved concave surface 51a extending in the longitudinal direction, and has a structure in which the opposite side to the curved concave surface 51a is open. Wavy side walls 51c are formed on both left and right sides of the curved concave surface 51a, and the inner surface of the wavy side wall 51c also constitutes the curved concave surface 51a.
　分割くさび体51の湾曲凹面51ａに，長手方向にらせん状にのびる複数の浅い溝51ｂが形成されている。複数のらせん状溝51ｂは，分割くさび体51が取り付けられる撚り線１の表面形状を転写した形状を備えている。上述したように，撚り線１は，１本の断面円形の炭素繊維束２を中心にして，その周囲に６本の断面円形の炭素繊維束２を撚り合わせることによってつくられているので，外層の６本の炭素繊維束２はいずれも撚り線１の長手方向にらせん状にのびている。湾曲凹面51ａに形成される複数のらせん状溝51ｂは，撚り線１を構成するらせん状にのびる炭素繊維束２のそれぞれに沿い，かつ炭素繊維束２の直径に応じた大きさ（幅）を持つ。らせん状溝51ｂは上述した左右の側壁部51ｃの内面にも形成される。 A plurality of shallow grooves 51 b spirally extending in the longitudinal direction are formed on the curved concave surface 51 a of the split wedge 51. The plurality of spiral grooves 51 b have a shape obtained by transferring the surface shape of the stranded wire 1 to which the dividing wedge 51 is attached. As described above, since the stranded wire 1 is formed by twisting six carbon fiber bundles 2 having a circular cross section around the one carbon fiber bundle 2 having a circular cross section, the outer layer Each of the six carbon fiber bundles 2 extends in a spiral shape in the longitudinal direction of the strand 1. The plurality of spiral grooves 51b formed in the curved concave surface 51a are along the respective spirally extending carbon fiber bundles 2 constituting the stranded wire 1 and have a size (width) according to the diameter of the carbon fiber bundles 2 Have. The spiral groove 51b is also formed on the inner surface of the left and right side wall portions 51c described above.
　撚り線１に２つの分割くさび体51を取り付けると，撚り線１の外層を構成する撚り合わされた６本の炭素繊維束２のそれぞれが，湾曲凹面51ａに形成された複数のらせん状溝51ｂのそれぞれに嵌る。さらに，隣り合うらせん状溝51ｂの間に形成されるらせん状にのびる稜線（凸条）が，撚り線１の隣り合う炭素繊維束２の間に形成されるらせん状の谷部に嵌る。撚り線１の表面を分割くさび体51の湾曲凹面51ａに広く接触させることができ，かつらせん状溝51ｂのそれぞれによって炭素繊維束２のそれぞれを拘束することができる。これによって撚り線１に局所的な力が加わることが防止され，かつ分割くさび体51による撚り線１の把持力が向上する。 When two split wedges 51 are attached to the stranded wire 1, each of the six twisted carbon fiber bundles 2 constituting the outer layer of the stranded wire 1 has a plurality of spiral grooves 51b formed in the curved concave surface 51a. Fit in each one. Further, spirally extending ridge lines (convex lines) formed between the adjacent spiral grooves 51 b fit in spiral valleys formed between the adjacent carbon fiber bundles 2 of the twisted wire 1. The surface of the stranded wire 1 can be in wide contact with the curved concave surface 51a of the split wedge 51, and each of the carbon fiber bundles 2 can be restrained by each of the spiral grooves 51b. As a result, the local force is prevented from being applied to the stranded wire 1, and the gripping force of the stranded wire 1 by the split wedge 51 is improved.
　図５および図６は，撚り線１に取り付けられた撚り線用くさび50がアンカーヘッド10の中空11内の深くにまで引き込まれた様子を示している。撚り線用くさび50がアンカーヘッド10の中空11内に引き込まれると，アンカーヘッド10の中空11の内壁によって撚り線用くさび50が周囲から中心方向に締め付けられる。これによって撚り線１に，撚り線用くさび50を介して，アンカーヘッド10がしっかりと定着される（くさび止めされる）。 5 and 6 show the stranding wedge 50 attached to the stranding 1 drawn deep into the hollow 11 of the anchor head 10. When the stranding wedge 50 is drawn into the hollow 11 of the anchor head 10, the stranding wedge 50 is clamped from the periphery in the central direction by the inner wall of the hollow 11 of the anchor head 10. As a result, the anchor head 10 is firmly fixed (wedge-fixed) to the strand 1 via the stranding wedge 50.
　図２に戻って，撚り線１を緊張する緊張作業では，ジャッキ（図示略）によって撚り線１が外向き（コンクリート部材60の壁面から離れる向き）（図２においては矢印で示す右方向）に引っ張られる。撚り線１が引っ張られると，撚り線１は引っ張られた方向（緊張方向，外向き）に移動し，これに伴って撚り線１に取り付けられている撚り線用くさび50も緊張方向に移動する。撚り線用くさび50はアンカーヘッド10の中空11から次第に引き出されて，以下に説明するアタッチメント20の収納空間21に入っていく。中空11から引き出された撚り線用くさび50には中空11の内壁による強い締め付け力が働かなくなるので，撚り線用くさび50を構成する２つの分割くさび体51の間の隙間がわずかに広がり，らせん状溝51ｂが炭素繊維束２に緩く嵌る状態になる。 Returning to FIG. 2, in a tensioning operation in which the twisted wire 1 is tightened, the twisted wire 1 is turned outward (a direction away from the wall surface of the concrete member 60) (right direction shown by an arrow in FIG. 2) It is pulled. When the twisted wire 1 is pulled, the twisted wire 1 moves in the pulled direction (tension direction, outward), and along with this, the wire wedge 50 attached to the twisted wire 1 also moves in the tension direction . The stranded wire wedge 50 is gradually drawn out of the hollow 11 of the anchor head 10 and enters the storage space 21 of the attachment 20 described below. Since a strong clamping force by the inner wall of the hollow 11 does not act on the stranded wire wedge 50 drawn out of the hollow 11, the gap between the two split wedges 51 constituting the twisted wire wedge 50 slightly expands, and a spiral The groove 51b is loosely fitted to the carbon fiber bundle 2.
　アンカーヘッド10の中空11から引き出された撚り線用くさび50（その大径の末端部分）を収納するための収納空間21を備えるアタッチメント（キーパープレート）20が，撚り線１を緊張する緊張作業時に，アンカーヘッド10とジャッキとの間に設けられる。アタッチメント20は，図示を省略する係合突起等によってアンカーヘッド10に簡易に固定される。 An attachment (keeper plate) 20 having a storage space 21 for storing the wire wedge 50 (a large diameter end portion) drawn out of the hollow 11 of the anchor head 10 tensions the wire 1 during a tensioning operation , Between the anchor head 10 and the jack. The attachment 20 is easily fixed to the anchor head 10 by an engagement protrusion or the like (not shown).
　図１および図２を参照して，アタッチメント20は，円筒状の外形を備え，その内部に，比較的大径の収納空間21と，収納空間21につながる，比較的小径の撚り線１を通すための通過孔22を備えている。収納空間21および通過孔22もいずれも円筒状の形状を持つ。収納空間21は撚り線用くさび50が回転可能な広さを持つように形成されており，撚り線用くさび50の大径の末端部の直径よりもやや大きい直径を持つ。４本の撚り線１に対応してアタッチメント20には４つの収納空間21および通過孔22の組が形成されている。また，収納空間21の底部（最も奥まった位置）には，後述するスラスト・ベアリング25が設けられている。 Referring to FIGS. 1 and 2, attachment 20 has a cylindrical outer shape, through which a relatively large diameter storage space 21 and a relatively small diameter strand 1 connected to storage space 21 are passed. Through holes 22 are provided. Both the storage space 21 and the passage hole 22 have a cylindrical shape. The storage space 21 is formed to have a rotatable width for the strand wire wedge 50 and has a diameter slightly larger than the diameter of the large diameter end of the strand wire wedge 50. A set of four storage spaces 21 and passage holes 22 is formed in the attachment 20 corresponding to the four strands 1. Further, at the bottom portion (the deepest position) of the storage space 21, a thrust bearing 25 described later is provided.
　図２を参照して，撚り線１を引っ張り続けると，撚り線用くさび50の末端部端面がアタッチメント20の収納空間21に設けられたスラスト・ベアリング25に当接する。撚り線１をさらに外方に引っ張っても，撚り線用くさび50は，それ以上撚り線１と一緒に外方に移動はしない。 Referring to FIG. 2, when the stranded wire 1 is pulled continuously, the end face of the end portion of the wire wedge 50 abuts against the thrust bearing 25 provided in the storage space 21 of the attachment 20. When the strand 1 is pulled further outward, the strand wedge 50 does not move outward together with the strand 1 any more.
　撚り線用くさび50がスラスト・ベアリング25に当接した後に撚り線１を引っ張り続けると，撚り線用くさび50は回転をしはじめる。すなわち，撚り線用くさび50は，撚り線１を構成する外層の６本の炭素繊維束２をレールとして，すなわち撚り線１のらせん状外周面に沿って，収納空間21にとどまりつつ，収納空間21内において撚り線１の周囲を回転する。この撚り線用くさび50の回転が，収納空間21に設けられたスラスト・ベアリング25によって補助される。収納空間21内に設けられたスラスト・ベアリング25によって，収納空間21内において撚り線用くさび50を無理なく回転させることができる。 If the stranding wedge 50 continues to be pulled after the stranding wedge 50 abuts on the thrust bearing 25, the stranding wedge 50 starts to rotate. That is, the wedge 50 for the stranded wire uses the six carbon fiber bundles 2 of the outer layer constituting the stranded wire 1 as a rail, that is, along the spiral outer peripheral surface of the stranded wire 1 while staying in the storage space 21 21 around the stranded wire 1 The rotation of the stranding wedge 50 is assisted by a thrust bearing 25 provided in the storage space 21. By means of the thrust bearing 25 provided in the storage space 21, the stranding wedge 50 can be rotated without difficulty within the storage space 21.
　撚り線用くさび50が収納空間21にとどまっているのに対し，撚り線１は外向きに移動するので，撚り線１を基準にすれば，撚り線用くさび50は，アンカーヘッド10に向けて，すなわち撚り線１の緊張方向とは逆向きに相対的に移動することになる。撚り線用くさび50の湾曲凹面51ａに形成されているらせん状溝51ｂが撚り線１のらせん状外周面に沿っているので，撚り線用くさび50が撚り線１上を回転しながら移動しても，撚り線用くさび50によって撚り線１が傷つけられてしまうことはない。 Since the stranding wire 1 moves outward while the stranding wedge 50 remains in the storage space 21, the stranding wedge 50 is directed to the anchor head 10 based on the stranding wire 1. That is, it moves relatively in the direction opposite to the direction of tension of the strand 1. Since the spiral groove 51 b formed in the curved concave surface 51 a of the wire wedge 50 is along the spiral outer peripheral surface of the wire strand 1, the wire wedge 50 moves while rotating on the wire strand 1. Also, the stranding wire 1 is not damaged by the stranding wedge 50.
　１回の緊張作業において，撚り線１はたとえば外向きに300mm引っ張られて緊張される。緊張を緩める（弛緩する）と，撚り線１は40mm～50mm程度，アンカーヘッド10の中空11内に引き込まれるようにして戻る（縮む）。緊張と弛緩とは複数回にわたって繰り返すことができる。撚り線１が戻るときに，撚り線用くさび50は撚り線１に連れていかれるようにしてアンカーヘッド10の中空11内に引き込まれる。このようにして，撚り線１に緊張を導入しつつ，アンカーヘッド10の中空11内に撚り線用くさび50をしっかりと嵌め込むことができる。上述のように，アタッチメント20の収納空間21内にスラスト・ベアリング25を設けておくことによって，収納空間21内において撚り線用くさび50を無理なく回転させることができ，かつアンカーヘッド10に向けて撚り線用くさび50を相対的に移動させることができるので，セットロス（ジャッキによって撚り線１に与えられる緊張力とプレストレストコンクリートに与えられる圧縮応力の差）（プレストレスの損失）を小さくすることができる。 In one tensioning operation, for example, the strand 1 is tensioned 300 mm outward and tensioned. When the tension is loosened (relaxed), the twisted wire 1 is pulled back (shrink) so as to be drawn into the hollow 11 of the anchor head 10 by about 40 mm to 50 mm. Tension and relaxation can be repeated multiple times. As the strand 1 returns, the stranding wedge 50 is drawn into the hollow 11 of the anchor head 10 as it is taken to the strand 1. In this manner, the stranding wedge 50 can be firmly fitted into the hollow 11 of the anchor head 10 while introducing tension to the stranding wire 1. As described above, by providing the thrust bearing 25 in the storage space 21 of the attachment 20, the stranded wire wedge 50 can be rotated without difficulty in the storage space 21 and toward the anchor head 10 Since the stranding wedge 50 can be moved relatively, the set loss (the difference between the tension applied to the strand 1 by the jack and the compressive stress applied to the prestressed concrete) (loss of prestress) is reduced Can.
　図６を参照して，緊張作業を終えると，アタッチメント20が取り外され，撚り線用くさび50の末端部から外に出ている撚り線１の余長部分が切断される。緊張作業が終了する。 With reference to FIG. 6, when the tensioning operation is finished, the attachment 20 is removed, and the extra long portion of the stranded wire 1 coming out from the end of the stranded wire wedge 50 is cut. The tension work is finished.
　図７はアタッチメントの変形例を示す拡大図である。 FIG. 7 is an enlarged view showing a modified example of the attachment.
　図７に示すアタッチメント20Ａは，本体部材26とキャップ部材27の２つの部材から構成されている点が，１つの部材から構成されている上述したアタッチメント20（図２参照）と異なる。本体部材26とキャップ部材27はたとえばねじ止めされて相互に固定される。本体部材26およびキャップ部材27に，アンカーヘッド10（図７において図示略）から引き出された撚り線用くさび50を収納する収納空間21が形成され，キャップ部材27に撚り線１を通すための通過孔22が形成されている。 The attachment 20A shown in FIG. 7 is different from the attachment 20 (see FIG. 2) described above which is composed of one member in that the attachment 20A is composed of two members of a main body member 26 and a cap member 27. The body member 26 and the cap member 27 are, for example, screwed to be fixed to each other. A storage space 21 is formed in the main body member 26 and the cap member 27 for accommodating the stranded wire wedge 50 drawn from the anchor head 10 (not shown in FIG. 7), and a passage for passing the stranded wire 1 in the cap member 27 Holes 22 are formed.
　本体部材26とキャップ部材27との間に形成される隙間にスラスト・ベアリング25が設けられる。本体部材26とキャップ部材27の２つの部材からアタッチメント20Ａを構成することによって，収納空間21にスラスト・ベアリング25を配置しやすい。 A thrust bearing 25 is provided in a gap formed between the main body member 26 and the cap member 27. By forming the attachment 20A from the two members of the main body member 26 and the cap member 27, the thrust bearing 25 can be easily disposed in the storage space 21.
　図８はアタッチメントのさらなる変形例であるアタッチメント20Ｂを示している。図７に示すアタッチメント20Ａとは，収納空間21内において，スラスト・ベアリング25の前方に，コイルばね28および当接リング部材29がさらに設けられている点が異なる。当接リング部材29とスラスト・ベアリング25の間にコイルばね28が位置する。 FIG. 8 shows an attachment 20B which is a further modification of the attachment. The attachment 20A shown in FIG. 7 is different from the attachment 20A in that a coil spring 28 and an abutment ring member 29 are further provided in front of the thrust bearing 25 in the storage space 21. A coil spring 28 is located between the abutment ring member 29 and the thrust bearing 25.
　撚り線１を外向き（図８の右方向）に引っ張って緊張すると，撚り線１とともに撚り線用くさび50も一緒に外向きに移動する。撚り線用くさび50の末端部端面はアタッチメント20Ｂの収納空間21に設けられた当接リング部材29に当接する。当接リング部材29は収納空間21の軸方向（撚り線１の長手方向）に移動可能な，中央に孔を備えるリング状の部材であり，撚り線１は当接リング部材29の中央孔およびコイルばね28の中を通されている。撚り線１を外向きに引っ張り続けると，撚り線用くさび50の末端部端面によって当接リング部材29が押され，当接リング部材29とスラスト・ベアリング25の間のコイルばね28が縮められる。縮まったコイルばね28がスラスト・ベアリング25に押し付けられると，スラスト・ベアリング25，コイルばね28，当接リング部材29，および撚り線用くさび50が回転をしはじめる。撚り線用くさび50は，撚り線１の周囲を回転しながら，撚り線１の緊張方向と逆向きに，撚り線１に対して相対的に移動する。 When the strand 1 is pulled outward (to the right in FIG. 8) to be tensioned, the stranding wedge 50 moves together with the strand 1 together. The end face of the end of the twisted wire wedge 50 abuts on a contact ring member 29 provided in the storage space 21 of the attachment 20B. The contact ring member 29 is a ring-shaped member movable in the axial direction of the storage space 21 (longitudinal direction of the stranded wire 1) and provided with a hole at the center. The coil spring 28 is passed through. Continuing to pull the strand 1 outward, the end face of the end of the wire wedge 50 pushes the abutment ring member 29 and the coil spring 28 between the abutment ring member 29 and the thrust bearing 25 is contracted. When the contracted coil spring 28 is pressed against the thrust bearing 25, the thrust bearing 25, the coil spring 28, the contact ring member 29 and the wire wedge 50 start to rotate. The stranding wedge 50 moves relative to the strand 1 in the direction opposite to the direction of tension of the strand 1 while rotating around the strand 1.
　撚り線１の緊張が緩められると，コイルばね28の復元力によって撚り線用くさび50はアンカーヘッド10の向き（図８の左方向）に押される。コイルばね28の復元力を，撚り線用くさび50をアンカーヘッド10の中空11に押し込む力として用いることができる。上述したセットロスをさらに小さくすることができる。 When the tension of the strand 1 is released, the stranding wedge 50 is pushed in the direction of the anchor head 10 (the left direction in FIG. 8) by the restoring force of the coil spring 28. The restoring force of the coil spring 28 can be used as a force for pushing the wire wedge 50 into the hollow 11 of the anchor head 10. The set loss described above can be further reduced.
　図９はアタッチメントのさらに他の変形例を示している。 FIG. 9 shows still another modification of the attachment.
　上述したアタッチメント20，20Ａおよび20Ｂでは，収納空間21内において撚り線用くさび50をスムーズに回転させかつ撚り線１に対して相対的に移動させるためにスラスト・ベアリング25が用いられている。図９に示すアタッチメント20Ｃでは，撚り線用くさび50を回転させるために，スラスト・ベアリングに代えてラジアル・ベアリング25Ａが用いられている。 In the attachments 20, 20A and 20B described above, the thrust bearing 25 is used in order to smoothly rotate the stranded wire wedge 50 in the storage space 21 and move it relative to the stranded wire 1. In the attachment 20C shown in FIG. 9, in order to rotate the wire wedge 50, a radial bearing 25A is used instead of the thrust bearing.
　収納空間21の底部（最も奥まった位置）にラジアル・ベアリング25Ａが設けられている。ラジアル・ベアリング25Ａは，内輪および外輪と，内輪と外輪の間に挟まれる転動体（玉）とを備え，外輪を静止させた状態で内輪のみを回転させることができる。リング部材24ａによってラジアル・ベアリング25Ａの外輪はキャップ部材27に固定されている。 A radial bearing 25A is provided at the bottom (the deepest position) of the storage space 21. The radial bearing 25A includes an inner ring and an outer ring, and rolling elements (balls) sandwiched between the inner ring and the outer ring, and can rotate only the inner ring while the outer ring is stationary. The outer ring of the radial bearing 25A is fixed to the cap member 27 by the ring member 24a.
　ラジアル・ベアリング25Ａの内輪にはリング部材24ｂを介して概略円筒状の回転体23が固定されている。ラジアル・ベアリング25Ａの内輪が回転すると円筒状回転体23も回転する。 A substantially cylindrical rotating body 23 is fixed to the inner ring of the radial bearing 25A via a ring member 24b. When the inner ring of the radial bearing 25A rotates, the cylindrical rotor 23 also rotates.
　収納空間21内にコイルばね28および当接リング部材29が設けられているのは，上述したアタッチメント20Ｂ（図８）と同じである。撚り線１を外向き（図９の右方向）に引っ張って緊張すると，撚り線１とともに撚り線用くさび50も一緒に外向きに移動する。撚り線用くさび50の末端部端面が当接リング部材29に当接し，コイルばね28が縮められる。ラジアル・ベアリング25Ａ（その内輪），円筒状回転体23，コイルばね28，当接リング部材29，および撚り線用くさび50が回転をしはじめる。撚り線用くさび50は，撚り線１の緊張方向と逆向きに，撚り線１に対して相対的に移動する。アタッチメント20Ｃにおいても，コイルばね28の復元力が，撚り線用くさび50をアンカーヘッド10の中空11に押し込むための力として用いられる。 The coil spring 28 and the contact ring member 29 are provided in the storage space 21 in the same manner as the attachment 20B (FIG. 8) described above. When the strand 1 is pulled outward (to the right in FIG. 9) to be tensioned, the stranding wedge 50 moves together with the strand 1 together. The end face of the wire wedge 50 abuts on the contact ring member 29 and the coil spring 28 is contracted. The radial bearing 25A (its inner ring), the cylindrical rotating body 23, the coil spring 28, the contact ring member 29, and the wire wedge 50 start to rotate. The stranding wedge 50 moves relative to the strand 1 in the direction opposite to the direction of tension of the strand 1. Also in the attachment 20C, the restoring force of the coil spring 28 is used as a force for pushing the wire wedge 50 into the hollow 11 of the anchor head 10.
　図１０はプレテンション方式において撚り線１を緊張している様子を概略的に示している。 FIG. 10 schematically shows how the twisted wire 1 is tensioned in the pretensioning method.
　プレテンション方式では，細長い製作台（ベッド）75上に張られた撚り線１が緊張される。緊張させた撚り線１を埋設するようにしてコンクリート（破線７で示す）が打設される。その後に撚り線１の緊張を開放することによってコンクリート部材７にプレストレスが導入される。上述したポストテンション方式が工事現場における作業に適するのに対し，プレテンション方式はコンクリート部材７の製造工場で行われる。 In the pre-tensioning method, the stranded wire 1 stretched on an elongated production stand (bed) 75 is tensioned. Concrete (indicated by the broken line 7) is cast in such a way that the strained strand 1 is embedded. Thereafter, by releasing the tension of the strand 1, prestress is introduced to the concrete member 7. While the above-described post-tensioning method is suitable for work at a construction site, the pre-tensioning method is performed at a manufacturing plant of the concrete member 7.
　撚り線１の両端にカプラ（連結金具）80がそれぞれ取り付けられている。カプラ80は，撚り線１（ＣＦＲＰケーブル）とＰＣ鋼線71とを接続（連結）するもので，その詳細は後述する。 Couplers (connection fittings) 80 are attached to both ends of the stranded wire 1 respectively. The coupler 80 is for connecting (connecting) the stranded wire 1 (CFRP cable) and the PC steel wire 71, the details of which will be described later.
　２つのカプラ80のそれぞれに接続されたＰＣ鋼線71が反力台72に係止されている。一方の反力台72にジャッキ73が設けられており，ジャッキ73によってＰＣ鋼線71が引っ張られる。これによって２つのカプラ80によって挟まれた撚り線１が緊張される。 A PC steel wire 71 connected to each of the two couplers 80 is locked to the reaction stand 72. A jack 73 is provided on one reaction plate 72, and the PC steel wire 71 is pulled by the jack 73. As a result, the stranded wire 1 sandwiched by the two couplers 80 is tensioned.
　２台の反力台72の間に撚り線１のみを用いると，コンクリート部材７中に埋設されずに廃棄処分される撚り線１の長さが長くなってしまう。上述のように，カプラ80を用いてコンクリート部材７に埋設されない範囲にＰＣ鋼線71を用いることによって，廃棄処分される撚り線１を少なく（短く）することができる。 If only the stranded wire 1 is used between the two reaction plates 72, the length of the stranded wire 1 not disposed in the concrete member 7 and disposed of for disposal will be long. As described above, by using the PC steel wire 71 in a range not embedded in the concrete member 7 using the coupler 80, it is possible to reduce (shorten) the stranded wire 1 to be disposed of.
　図１１は，カプラ80およびカプラ80の一端に連結されるスリーブ10Ａの拡大図を示している。図１２は図１１に示すカプラ80およびスリーブ10Ａの縦断面図である。図１３はカプラ80に撚り線１を接続している様子を示している。 FIG. 11 shows an enlarged view of the coupler 80 and the sleeve 10A connected to one end of the coupler 80. As shown in FIG. FIG. 12 is a longitudinal sectional view of the coupler 80 and the sleeve 10A shown in FIG. FIG. 13 shows how the stranded wire 1 is connected to the coupler 80.
　図１１および図１２を参照して，カプラ80は円筒状の外形を有し，その内部に比較的大径の円筒状の内部空間85と，内部空間85につながる比較的小径の円筒状の貫通孔86と備えている。以下，内部空間85側をカプラ80の一端部と呼び，貫通孔86側をカプラ80の他端部と呼ぶ。カプラ80の一端部に，スリーブ10Ａがねじ止めによって連結される。スリーブ10Ａは，上述したアンカーヘッド10とほぼ同様の形状を有するもので，概略円錐台形状の中空11が内部に形成されており，この中空11内に撚り線用くさび50が嵌め込まれている。 Referring to FIGS. 11 and 12, coupler 80 has a cylindrical outer shape, and has a relatively large diameter cylindrical internal space 85 and a relatively small diameter cylindrical penetration connected to internal space 85 therein. It is provided with a hole 86. Hereinafter, the inner space 85 side is referred to as one end of the coupler 80, and the through hole 86 side is referred to as the other end of the coupler 80. The sleeve 10A is connected to one end of the coupler 80 by screwing. The sleeve 10A has substantially the same shape as the anchor head 10 described above, and a hollow 11 having a substantially frusto-conical shape is formed inside, and the wire wedge 50 is fitted in the hollow 11.
　カプラ80の内部空間85の一端部側に上述したアタッチメント20Ｃ（図９参照）が固定的に設けられており，他端部側にはＰＣ鋼線71用のスリーブ83が固定的に設けられている。ＰＣ鋼線71の末端部を挟んだくさび84がスリーブ83の中空にきつく嵌め込まれることによって，カプラ80の他端部にＰＣ鋼線71の末端部がくさび止めされ，カプラ80の他端部にＰＣ鋼線71が接続される。 The attachment 20C (see FIG. 9) described above is fixedly provided on one end side of the internal space 85 of the coupler 80, and the sleeve 83 for the PC steel wire 71 is fixedly provided on the other end side. There is. When the wedge 84 sandwiching the end of the PC steel wire 71 is tightly fitted in the hollow of the sleeve 83, the end of the PC steel wire 71 is wedged to the other end of the coupler 80 and the other end of the coupler 80 is The PC steel wire 71 is connected.
　図１３を参照して，カプラ80の一端部に撚り線１を接続するときには，スリーブ10Ａの口の小さい先端開口から撚り線１がスリーブ10Ａ内に押し込まれる。撚り線１はスリーブ10Ａに設けられた撚り線用くさび50内（２つの分割くさび体51の間）（図３，図４参照）にわずかに入り込むが，上述したように，分割くさび体51の湾曲凹面51ａにはらせん状溝51ｂが形成されているので，撚り線用くさび50内（２つの分割くさび体51の間）に撚り線１をそのまままっすぐに通すことはできない。このため撚り線１をスリーブ10Ａ内に押し込むと，撚り線１によって撚り線用くさび50が押され，撚り線用くさび50はスリーブ10Ａの中空11から離れる向きに移動し，アタッチメント20Ｃの収納空間21に入っていく。 Referring to FIG. 13, when connecting the stranded wire 1 to one end of the coupler 80, the stranded wire 1 is pushed into the sleeve 10A from the small end opening of the mouth of the sleeve 10A. The stranded wire 1 slightly penetrates into the stranded wire wedge 50 (between the two split wedges 51) (see FIGS. 3 and 4) provided on the sleeve 10A, but as described above, the split wedges 51 are Since the spiral groove 51b is formed in the curved concave surface 51a, the twisted wire 1 can not be passed straight as it is through the twisted wire wedge 50 (between the two split wedges 51). Therefore, when the twisted wire 1 is pushed into the sleeve 10A, the twisted wire wedge 50 is pushed by the twisted wire 1, the wire wedge 50 moves away from the hollow 11 of the sleeve 10A, and the storage space 21 of the attachment 20C. Go into.
　アタッチメント20Ｃの収納空間21に入った撚り線用くさび50がさらに押し込まれると，上述したように，アタッチメント20Ｃが備えるラジアル・ベアリング25Ａが回転をしはじめ，撚り線用くさび50も回転をしはじめる。撚り線用くさび50が回転をしはじめることで，撚り線１は，撚り線用くさび50の中を次第にカプラ80に向けて移動しはじめる。このようにアタッチメント20Ｃは撚り線１のカプラ80への接続にも用いることができる。 When the stranding wire wedge 50 in the storage space 21 of the attachment 20C is further pushed in, as described above, the radial bearing 25A provided in the attachment 20C starts to rotate, and the stranding wedge 50 also starts to rotate. As the stranding wedge 50 starts to rotate, the stranding wire 1 starts to gradually move toward the coupler 80 in the stranding wedge 50. Thus, the attachment 20C can also be used to connect the stranded wire 1 to the coupler 80.
　撚り線１が撚り線用くさび50内を完全に通過し，カプラ80に到達した後，上述したように，ジャッキ73を用いて撚り線１が緊張される（図１０）。 After the strand 1 passes completely through the strand wedge 50 and reaches the coupler 80, as described above, the strand 1 is tensioned using the jack 73 (FIG. 10).
　ラジアル・ベアリング25Ａを備えるアタッチメント20Ｃに代えて，スラスト・ベアリング25を備えるアタッチメント20，20Ａ，20Ｂ（図２，図７，図８）をカプラ80の内部空間85に設けてもよい。 Instead of the attachment 20C having the radial bearing 25A, the attachment 20, 20A, 20B (FIGS. 2, 7 and 8) having the thrust bearing 25 may be provided in the internal space 85 of the coupler 80.
１　撚り線（緊張材）
２　炭素繊維束
10　アンカーヘッド（定着具）
10Ａ　スリーブ
11　中空
20，20Ａ，20Ｂ，20Ｃ　アタッチメント
21　収納空間
22　通過孔
25　スラスト・ベアリング
25Ａ　ラジアル・ベアリング
28　コイルばね
50　撚り線用くさび
51　分割くさび体
51ａ　湾曲凹面
51ｂ　らせん状溝
71　ＰＣ鋼線
80　カプラ
85　内部空間 1 Stranded wire (tendon)
2 carbon fiber bundle
10 anchor head (fixer)
10A sleeve
11 Hollow
20, 20A, 20B, 20C attachment
21 Storage space
22 passage hole
25 thrust bearing
25A radial bearing
28 coil spring
50 Wedge Wedge
51 split wedge
51a curved concave
51b spiral groove
71 PC steel wire
80 coupler
85 Internal space

Claims (6)

  1. 　撚り線のらせん状外周面に係合するらせん状の複数の溝が形成された内面を備え，上記撚り線の外周面に取り付けられる撚り線用くさびの大径の末端部が収納される収納空間と，上記収納空間に連続し，上記撚り線の通過を許す寸法を有する貫通孔とを備え，
    　上記収納空間から上記貫通孔への向きに上記撚り線が引っ張られたまたは押し込まれたときに，上記撚り線のらせん状外周面に沿う上記撚り線用くさびの回転を補助する回転部材が上記収納空間内に設けられている，
    　アタッチメント。     A storage space having an inner surface formed with a plurality of helical grooves engaged with the helical outer peripheral surface of the stranded wire, and a large diameter end portion of the stranded wire wedge attached to the outer peripheral surface of the stranded wire And a through hole continuous to the storage space and having a size that allows passage of the stranded wire,
    The rotating member for assisting the rotation of the stranding wedge along the helical outer peripheral surface of the strand when the strand is pulled or pushed in the direction from the storage space to the through hole. Provided in space,
    attachment.
  2. 　上記収納空間内の上記回転部材の前方に，上記撚り線が上記収納空間から上記貫通孔への向きに引っ張られたまたは押し込まれたときに上記撚り線とともに移動する上記撚り線用くさびによって押されて圧縮され，かつ上記撚り線を引っ張るまたは押し込む力を開放したときに上記撚り線用くさびを上記貫通孔から上記収納空間への向きに付勢する弾性体がさらに設けられている，
    　請求項１に記載のアタッチメント。     The stranding wire is pushed by the stranding wedge, which moves with the stranding wire, when the stranding wire is pulled or pushed from the storage space to the through hole in front of the rotating member in the storing space. An elastic body is further provided which biases the wire wedge from the through hole toward the storage space when the wire is compressed and the force for pulling or pushing the wire strand is released.
    The attachment according to claim 1.
  3. 　上記回転部材がスラスト・ベアリングである，請求項１または２に記載のアタッチメント。 The attachment according to claim 1 or 2, wherein said rotating member is a thrust bearing.
  4. 　上記回転部材がラジアル・ベアリングである，請求項１または２に記載のアタッチメント。 The attachment according to claim 1, wherein the rotating member is a radial bearing.
  5. 　撚り線のらせん状外周面に係合するらせん状の複数の溝が形成された内面を備え，上記撚り線の外周面に取り付けられる撚り線用くさびと，
    　上記撚り線用くさびがくさび止めされる中空が形成されたアンカーヘッドと，
    　上記撚り線用くさびの大径の末端部が収納される収納空間，および上記収納空間に連続し，上記撚り線の通過を許す寸法を有する貫通孔を備え，上記貫通孔から外に出ている上記撚り線を緊張したときに，上記撚り線のらせん状外周面に沿う上記撚り線用くさびの回転を補助する回転部材が上記収納空間内に設けられているアタッチメントと，
    　を備えている，撚り線の緊張キット。     A wire wedge provided with an inner surface on which a plurality of helical grooves are formed to engage with the outer circumferential surface of the wire;
    A hollow anchor head to which the stranded wire wedge is wedged;
    A storage space for accommodating the large diameter end portion of the stranded wire wedge, and a through hole continuous to the storage space and having a size allowing passage of the stranded wire, and extending out from the through hole An attachment provided in the storage space with a rotating member for assisting the rotation of the stranding wedge along the helical outer peripheral surface of the strand when the strand is tensioned;
    Equipped with a stranded tension kit.
  6. 　撚り線のらせん状外周面に係合するらせん状の複数の溝が形成された内面を備え，上記撚り線の外周面に取り付けられる撚り線用くさびと，上記撚り線用くさびがくさび止めされる中空が形成されたスリーブとを備える定着具が連結される撚り線接続カプラであって，
    　上記カプラ内に，上記撚り線用くさびの大径の末端部が収納される収納空間，および上記収納空間に連続し，上記撚り線の通過を許す寸法を有する貫通孔を備え，上記撚り線を上記収納空間に向けて押し込んだときに，上記撚り線のらせん状外周面に沿う上記撚り線用くさびの回転を補助する回転部材が上記収納空間内に設けられているアタッチメントが設けられている，
    　撚り線接続カプラ。     An inner surface having a plurality of helical grooves engaged with a helical outer peripheral surface of a stranded wire, and a stranded wire wedge attached to the outer peripheral surface of the stranded wire and the stranded wire wedge being wedged It is a stranded wire connection coupler to which a fixing tool comprising a hollow formed sleeve is connected,
    The coupler includes a storage space in which the large diameter end portion of the strand wedge is stored, and a through hole continuous to the storage space and having a size allowing passage of the strand, There is provided an attachment provided in the storage space with a rotating member that assists the rotation of the stranding wedge along the helical outer peripheral surface of the stranded wire when the storage space is pushed into the storage space.
    Stranded connection coupler.
PCT/JP2017/036100 2017-10-04 2017-10-04 Attachment for rotating stranded wire wedge, tension kit for stranded wire, and stranded wire connection coupler WO2019069389A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006219912A (en) * 2005-02-10 2006-08-24 Anderson Technology Kk Fixing structure between prestressing strand and socket, and device for press-fitting and fixing prestressing strand and wedge into socket
WO2016203649A1 (en) * 2015-06-19 2016-12-22 東京製綱株式会社 Continuous fiber-reinforced material tensioning device, tensioning method for continuous fiber-reinforced material, and wedge body

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006219912A (en) * 2005-02-10 2006-08-24 Anderson Technology Kk Fixing structure between prestressing strand and socket, and device for press-fitting and fixing prestressing strand and wedge into socket
WO2016203649A1 (en) * 2015-06-19 2016-12-22 東京製綱株式会社 Continuous fiber-reinforced material tensioning device, tensioning method for continuous fiber-reinforced material, and wedge body

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