JP2768032B2 - PC steel stranded wire connector and connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC steel stranded wire connector and a connecting method in a prestressed concrete method.

[0002]

2. Description of the Related Art Conventional PC steel stranded wire connector 21 or 49
As shown in FIG. 6A, a pair of left and right chuck bodies 23 are screwed into a cylindrical coupler 22 having screw portions 28 screwed into inner walls at both ends from the left and right sides, and the tapered fitting thereof is performed. The wedge 24 divided at the portion 29 is tightened, and the PC steel stranded wire 2 inserted from the left and right at the inner wall 30 thereof.
Some have fastened 5,25. In FIG. 6, the PC steel stranded wire 25 is schematically illustrated by an outline.

Further, a cylindrical susa 26 is inserted into the inside of the cylindrical coupler 22, and conical springs 27 are mounted on both sides of an intermediate partition plate 31 so as to face each other, and each wedge 24, 24 is tapered. It is urged in the direction of pushing into the shape fitting portions 29, 29. Thus, the wedge 24 receives the reaction force of the spring 27 and is tightened by screwing the chuck body 23. As shown in FIG. 6-2, the cylindrical coupler 22 and the intermediate partition plate 31 are aligned so that the circular holes 3 facing each other across the bottom wall 51 in the axial direction.
8, 38, and a spring 39,
There is also a conventional PC steel stranded wire connector 49 in which a cylindrical coupler 50 is formed by mounting the 39 in opposition.

However, in the prestressed concrete method, the axis C
Since the tension is applied in the -C direction, the divided wedges 24 are aligned with the tapered fitting portions 29 as shown in the figure, and the PC steel strands 25 are held in a straight posture to securely grip the wedges 24. Need to be done.

[0005]

However, in the conventional structure of the stranded PC steel connecting device 21 or 49, the opening 32 is required.
When inserting the PC steel stranded wire 25 from above, usually the PC steel stranded wire on one side has a length of 20 m or more, it is difficult to insert while controlling the stranded wire straightly, and a large force is required. Therefore, it is possible that the spring 27 or 39 may be unevenly expanded and contracted due to the momentum, and the wedge 24 may not be urged straight. In addition, it is necessary for the wedge 24 to tighten the PC steel stranded wire. In the initial stage of the tension, the wedge 24 sandwiches the PC steel stranded wire and integrally enters the tapered portion 29, and the surface pressure due to the wedge action of the tapered portion 29 causes a gap between the PC steel stranded wire and the wedge inner wall 30. It must be sufficient to prevent slippage, but this pinching effect is confirmed by the fact that the tensile strength of the stranded wire is 5 to 1
There is a problem that it cannot be confirmed until a tensile load of about 5% is applied.

In order to discover the above-mentioned inconvenient state and to confirm the pinching action, it has conventionally been required to apply a pretension indicated by an arrow in the direction of the central axis CC along the PC steel stranded wire 25 after the connection has been made. Requires special hydraulic equipment,
It takes time and effort, resulting in delays in work and an increase in work costs.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and eliminates a wedge biasing spring which is a feature of the structure of a conventional connector, thereby facilitating the expansion of an inner wall. Easily inserts and solves the conventional inconvenience factor by directly tightening the chuck body by screwing in the chuck body instead of relying on the biasing force of the spring and the pre-tension after connection construction In addition, this eliminates the need for a pre-tensioning step, which is a cause of work delay and cost increase.

Namely configuration of the present invention, (1) the center
In the axis (C-C) direction, the center of the member outer peripheral surface provided with a <br/> threaded consolidating grip portion 44, the <br/> Ji portions 45 ne females on the left and right ends inside wall and screwed, across the bottom wall 46, left
A cylindrical coupler 42 formed by drilling a circular hole 9, 9 having a bottom surface of the facing conical surface on the right, comprises a screwed for gripping portion 47 to the rear end of the cylindrical body the outer peripheral surface, an outer circumferential surface thereof the male screw portion 48 screwed with the female screw portion 45 at the distal end and engaging set, the tubular member
A pair of left and right chuck bodies 43, 43 each having a tapered fitting member 12 formed on an inner peripheral surface thereof, and an outer peripheral taper thereof.
Surface is fitted to the fitting portion 12, when the inner wall 13 of the circular hole becomes a PC steel strand 5 from the divided wedge 4 which grips, for connecting the stranded wire 5 PC steel, the tip 1
8 is a circle formed on the bottom wall 46 of the cylindrical coupler 42.
The straight edge is corrected by striking the conical surface.
The surface 15 is brought into contact with the end surface 14 of the cylindrical coupler 42.
The chuck body 43 is tightened while
And (2) the PC steel stranded wire connector 41, which is characterized in that the PC steel stranded wire 5 is fastened through the judge 4 . First, loosen the chuck body 43 and remove the cylindrical coupler 42 and wedge 4
Spaced between, inclusive interpolation the PC steel strand 5 from the opening 17, is brought into contact with the circular hole of the wedge 4, diverge cracks 20 of the inner wall 13, the tip is inserted the inner wall 13 18
The butt the conical surface formed in the bottom wall 46, correct 矯 the PC steel strand 5 in straight posture, then, seen tightening the chuck body 43, the end face 15 of the wedge 4 of the cylindrical coupler 42
A method of connecting the stranded PC steel wire 5 in which the tapered surface of the wedge 4 is pressed into the fitting portion 12 by being brought into contact with the end surface 14 and the stranded PC steel wire 5 is fastened on the inner wall 13 thereof. is there.

[0009] In the above connector, threaded consolidating grip portion 44 is quadrangular cylindrical body periphery, hexagon, it is not preferable is of polygonal shape such as octagonal. Also, the inner wall 13 of the wedge 4
The, it is desirable to Katachi設a serrated groove 16 which becomes resistant to drawing direction D relative to the PC steel strand 5. Also split
A square circumferential groove 19 is formed in the outer periphery of the wedge 4
Then, the wire 33 is wound around the circumferential groove 19 and
It is desirable not to shift.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail. FIG. 1 is a front sectional view of a PC steel stranded wire connector of the present invention showing a state where a PC steel stranded wire is connected, and FIG.
FIG. 3 is a side sectional view taken along line BB of FIG. 1.

The PC steel stranded wire connector 1 of the present invention comprises a central joint 2, chuck bodies 43 screwed on the left and right sides thereof, and opposed tapered fitting portions 12, 12.
A pair of left and right PC steel stranded wires 5, 5 are fastened and connected by inner walls 13, 13, respectively.

The cylindrical coupler 42 is provided with a quadrangular or hexagonal gripping portion 44 at the center of the outer periphery of the member so as to be easily screwed with a spanner or the like. Note that the circular gripping portion 44 may be knurled and screwed with a pipe wrench. Female screw portions 45, 45 are screwed into the left and right inner walls of the gripping portion 44, and the female screw portions 45, 45 are machined to face left and right.
Circular holes 9 and 9 having a countersunk conical bottom surface are formed on the left and right sides of the bottom wall 46 in the direction of the axis CC along the center of the member.
There Ri bored Tare, both sides of the bottom wall 46 is formed in a conical surface,
Used to correct the straight posture of the stranded PC steel wire 5 described later
You. Also since tightening the end face 14 of the cylindrical coupler 42 is abutted against the end face 15 of the wedge 4, flat also both end surfaces, that pore diameter of the circular hole 9 is smaller than the outer diameter of the end face 1 5
Necessary and, Nde insertion the other PC steel strand 5, the tip 18
Must be larger than the outer diameter of the stranded wire 5 because the butt wire abuts against the bottom wall 46 . A small diameter air hole is formed in the bottom wall 46.

The chuck body 43 is provided with a quadrangular or hexagonal gripping portion 6 to be easily screwed to the rear end of the outer periphery of the cylindrical body with a spanner or the like. The circular portion may be knurled and screwed with a pipe wrench. A male screw portion 48 that is screwed with the female screw portion 45 of the cylindrical coupler 42 is provided at the inner peripheral end in the center direction, and can be screwed to the left and right of the cylindrical coupler 42. At the rear end of the inner periphery, a fitting portion 12 is formed to expand in a tapered shape from an opening 17 on the rear end surface. The inner diameter of the opening 17 is slightly larger than the outer diameter of the stranded PC steel wire 5.

FIG. 4 is an exploded view for explaining the wedge 4, in which 4-1 is divided into three parts and 4-2 is divided into two parts. Three divisions are preferable to two divisions. FIG. 5 is a partial cross-sectional view for explaining the sawtooth groove 16 of the inner wall 13. The tapered wedge 4 divided into three or two by the crack 20 is fitted into the fitting portion 12 of the chuck body 43 . At the center of wedge 4, penetrate PC steel stranded wire 5
A circular hole is drilled , and the PC steel stranded wire 5 is fastened to the inner wall 13 divided into three or two together with the insertion. The inner wall 13 is formed with a saw-tooth groove 16 so as to have a resistance in the drawing direction D with respect to the PC steel stranded wire 5. Further, a rectangular circumferential groove 19 is formed in the outer periphery of the wedge 4, and the circumferential groove 19 is
And the divided wedges 4 are integrated with each other.
It is made movable .

Next, a method of connecting the PC steel stranded wire 5 by the PC steel stranded wire connector 1 configured as described above will be described. First, the left and right chuck bodies 43, 43 screwed to the cylindrical coupler 42 are loosened to separate the end surface 14 of the cylindrical coupler 42 from the end surface 15 of the wedge 4.

The stranded PC steel wire 5 is inserted through the opening 17,
The end face 15 of the wedge 4 is the end face 14 of the cylindrical coupler 42
The wedge 4 is pointed at its tip 18 until it comes into contact with.
The divided wedges 4 are integrally moved by the wire 33 so that the insertion division is released from the state of insertion into the 12 and the inner wall 1
3 can be opened at the crack 20.

The PC steel strand 5 becomes possible inserted through the inner wall 13, the tip 18 is Ri through the inner wall 13, guided to the circular hole 9
And strikes a conical surface formed on the bottom wall 46. PC steel strand 5 is the axis by the conical surface of the bottom wall 46 (C-C) towards
Is modeled after direction, is Tadashisa 矯 in straight posture.

Next, the chuck body 43 is screwed into the cylindrical coupler 42 by using the gripping portions 44 and 47 and tightened. The wedge 4 is fitted into the fitting portion 12 again, the divided inner wall 13 is closed and the PC steel stranded wire 5 is fastened, and the connection is completed. In the fastened state, a slight interference is left between the female screw portion 45 and the male screw portion 48. The left and right may be connected separately, or the left and right may be connected simultaneously.

[0019]

Since the present invention has the above-described structure and operation, the following various effects can be obtained. First PC
Since the insertion of the steel stranded wire and the direct screwing and tightening of the chuck body are sufficient, the connection work is simple and the tightening state can be easily checked. In addition, the PC stranded wire is straightened.
Make sure that the left and right strands are aligned and fastened.
Therefore, it is easy to tighten the left and right chuck bodies.
Therefore, the fastening by the wedge becomes stable and reliable. Also, PC
Since the steel stranded wire can be pressed against the bottom wall and the wedge end face pressed against the coupler end face to tighten the chuck body,
The initial tightening is sufficient, so that the conventional pre-tensioning work is not required, and disadvantages such as work delay and cost increase are eliminated. And since this PC steel stranded wire connector does not have the biasing force of a spring, it is easy to insert a PC steel stranded wire.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a PC steel stranded wire connector according to an embodiment of the present invention.

FIG. 2 is a central sectional view taken along line AA of FIG. 1;

FIG. 3 is a side sectional view taken along line BB of FIG. 1;

FIG. 4 is a development view for explaining a divided wedge,
4-1 is the one divided into three, 4-2 is the one divided into two

FIG. 5 is a partial cross-sectional view of an inner wall of a wedge in which a saw tooth groove is formed.

FIGS. 6A and 6B are front cross-sectional views of two examples of a conventionally-structured stranded PC steel connector.

[Explanation of symbols]

 Reference Signs List 4 Wedge 5 PC steel stranded wire 9 Circular hole 12 Fitting portion 13 Inner wall 14 End face 15 End face 17 Opening 18 Tip 19 Circumferential groove 21 Conventional PC steel stranded wire connector 33 Wire 41 PC steel stranded wire connector 42 Cylindrical coupler 43 Chuck body 44 Gripping part 45 Female thread part 46 Bottom wall 47 Gripping part 48 Male thread part 49 Conventional PC steel twisted wire connector

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Keiji Yamagata 10-1 1-15-1 Hiraoka, Toyohira-ku, Sapporo-City Road Public Housing No. 134 (72) Inventor Isuji Kojima 2-1-2-16 Sumikawa, Minami-ku, Sapporo-shi Highway Public Housing No. 101 (72) Inventor Yoshitaka Nishida 4-4-2, Takaba-cho, Nada-ku, Kobe (56) References JP-A-61-38826 (JP, A) JP-A-51-46417 (JP, U.S.A.) (Japanese) 52-60124 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04C 5/12 E04C 5/08 E04G 21/12

Claims (4)

(57) [Claims] 1. A method according to claim 1, wherein the direction of the center axis (CC) is
In the center of the outer peripheral surface of the member, a grip portion 44 for screwing is provided,
And screwed to the internal thread portion 45, 45 at its left and right end inner wall, across the bottom wall 46, a bottom surface of the conical surface to face the right and left
Cylindrical coupler 42 having circular holes 9, 9
If, comprising a screwed for gripping portion 47 to the rear end of the cylindrical body the outer peripheral surface,
The male screw portion 48 screwed with the female screw portion 45 on its outer circumferential surface distal portion and engaging set, a pair of right and left chuck body formed by Katachi設a tapered fitting portion 12 to the tubular body inside peripheral surface 43,4
3 and its outer peripheral tapered surface are fitted into the fitting portion 12,
It consists of a divided wedge 4 that grips the PC steel strand 5 at the inner wall 13 of the circular hole , and connects the PC steel strand 5
The tip 18 of the cylindrical coupler 42
Straightened to a straight posture by hitting the conical surface formed on the wall 46
Then, the end face 15 of the wedge 4 is connected to the cylindrical coupler 4.
2 while being in contact with the end surface 14 of the chuck body 4.
3 and twist the PC steel through the wedge 4
A PC steel stranded wire connector 41, characterized in that the wire 5 is fastened . 2. The stranded PC steel wire according to claim 1, wherein a saw-tooth groove 16 having resistance in the drawing direction D with respect to the stranded PC steel wire 5 is formed in the inner wall 13 of the wedge 4. Connecting tool 41. 3. A rectangular circumferential groove 19 is formed in the outer periphery of the divided wedge 4, and a wire 33 is wound around the circumferential groove 19 so as not to be displaced by a crack 20. The PC steel stranded wire connector (41) according to claim 1 or 2. 4. The PC steel strand connector 41 according to any one of claims 1 to 3, first separation between the cylindrical coupler 42 and wedge 4 loosen the chuck body 43, PC steel twisted included interpolation line 5 from the opening 17, is brought into contact with the circular hole of the wedge 4, cracks 20 of the inner wall 13
Was expanded, the bottom wall 4 to the tip 18 by inserting the inner wall 13
Butt the conical surface formed in 6, correct 矯 stranded wire 5 the PC steel straight posture, then, seen tightening the chuck body 43,
The end face 15 of the wedge 4 is connected to the end face 14 of the cylindrical coupler 42.
, The tapered surface of the wedge 4 is pushed into the fitting portion 12, and the PC steel stranded wire 5 is fastened on the inner wall 13 thereof .