JP2805270B2 - Terminal fixing method of composite cable made of high strength low elongation material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable, particularly a composite cable made of a high-strength, low-elongation material, which is used for concrete reinforcement (RC) or prestressed concrete tension (P).
About end end fixing method when used as C).

[0002]

2. Description of the Related Art Conventionally, as a fixing tool for fixing a PC steel wire using a piano wire, particularly a PC steel stranded wire, a fixing device described in, for example, Japanese Utility Model Publication No. 52-47844 is known. As shown in FIG. 6, the conventional fixing device 40 has a sleeve 41 in which a cable fitting hole 42 for crimping a cable is formed on one side, and a tension portion for engaging a supporting plate on the other side. It has a long rod-like shape consisting of a tension screw portion 43 in which a screw 44 with which a nut is screwed is formed.
For this reason, in order to press-bond the cable to this fixing device by extruding the cable with an extrusion die and crimping the cable, the distance between the die and the piston of the jack is inevitably long, causing buckling of the fixing device. It is difficult to process. For this reason, it has been difficult to apply an extrusion die to the crimping connection between the crimping tool and the cable. Conventionally, the crimping connection between the fixing tool and the cable is performed by using a split die only and dividing into two or three times. This is done by sequentially reducing the diameter of the sleeve.

[0003]

The crimping with a split die receives a shear load from one direction, and is usually divided into a plurality of times to obtain a fixing efficiency of 100% by sufficiently reducing the diameter of the sleeve. Due to the need to press, a strong shear load acts on the wire itself. This shear load does not cause much problem in the case of PC steel wire, but a plurality of carbon fibers, aramid fibers, etc., which have recently been used as tension members in place of PC steel wire, are assembled and twisted, and then heat-cured. When applied to a treated composite cable, there is a problem that shearing causes breakage between press positions and breakage occurs early due to tension.
Also, in diameter reduction processing by a press, there is a problem that the sleeve portion must be lengthened in order to obtain a sufficient pressure force due to a limited pressure force, and a large space is required for fixing. . The present invention is intended to solve the above-mentioned problems of the conventional fixing method, and does not apply a strong shearing load to the cable itself, and has a high fixing efficiency even with a composite cable made of a high-strength low-elongation material. in fixing it can also aims to provide a constant Chakuhoho that Ru can be effectively fixing even in a narrow space can be possible to shorten the length of the sleeve.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to provide a method for fixing a terminal of a cable according to the present invention.
Terminal fixing method of a composite cable made of a material,
The terminal fixing device is a cable having a cable fitting hole formed therein.
From the outer diameter of the cable crimping part after diameter reduction processing.
With a small outside diameter and a screw hole formed inside
A sleeve body comprising a shaft joint, and the screw shaft.
A screw with a screw to be screwed into the screw hole of the shaft joint
And the composite cable
Is heat-cured into high-strength, low-elongation fibers on the periphery of
The buffer layer is integrated by impregnating the conductive resin and pressing.
Formed in the cable fitting hole of the terminal fixing tool.
Insert the terminal fixing part of the composite cable, and in that state,
The minimum inner diameter of the cable crimping part is smaller than the outer diameter of the cable crimping part.
Reduced diameter by extrusion die with die hole
Crimping connection of the cable terminal fixing part to the cable crimping part, and
After that, screw the screw shaft into the screw shaft joint.
And connect the other end of the screw shaft to a fixed object.
By adopting a configuration characterized by
I was able to decide .

At this time, a screw shaft joint of the terminal fixing device is used.
After screwing and connecting the screw shaft to the hand,
To prevent the shaft joint and screw shaft from rotating relative to each other.
It is desirable to perform a rotation prevention process for the purpose.

[0006]

Since the sleeve body and the screw shaft are formed separately, the compression load by the jack can be applied only to the sleeve body by separating the sleeve body and the screw shaft during the composite cable crimping process.
Therefore, the portion receiving the compressive load for extrusion can be shortened, and even if a strong compressive load is received, buckling of the terminal fixing device does not occur, and diameter reduction processing with a high degree of processing can be performed. By operating the jack, the sleeve body is gradually pressed by the piston at the tip of the cable crimping part into the die hole, forced to undergo plastic processing while passing through the die hole, and reduced in diameter, and fitted into the cable fitting hole. Firmly grasp the composite cable. At that time, since the sleeve body is subjected to uniform and strong diameter reduction from the entire outer periphery, a much stronger crimping force can be obtained compared to the conventional press with a split die, and the crimping length is shortened compared to the conventional one. However, sufficient fixing efficiency can be obtained.

[0007] In the case of using an extrusion die, since a strong shearing force from one direction is not applied to the outer peripheral portion of the cable, which causes early breakage of the cable, the extruding die is formed of a high-strength low-elongation fiber strand. Even in the case of a composite cable, sufficient fixing efficiency can be obtained for a long period without damaging the cable. In the case of a composite cable composed of stranded high-strength low-elongation fibers, in particular, by providing a buffer layer in the fixing portion, the cutting edge formed on the inner surface of the cable fitting hole does not directly contact the composite cable surface,
Less risk of damaging the composite cable and higher fusing efficiency. After screwing the connecting rod, if the connecting rod and a part of the connecting rod joint are welded to prevent rotation,
The cable can be prevented from rotating due to torque.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. The terminal fixing device 1 of the present embodiment includes a sleeve main body 2 and a screw shaft 10. As shown in FIG. 1, the sleeve main body 2 is used for screwing a screw shaft with a cable crimping portion 5 having a cable fitting hole 4 for fitting a cable and crimping and connecting the sleeve by diameter reduction processing. And a screw shaft joint portion 7 in which a screw hole 6 is formed. On the inner surface of the cable fitting hole 4 of the cable crimping portion 5,
As described later, a spiral cutting process is performed to easily and reliably fix the crimp to the cable. The outer diameter of the threaded shaft joint 7 is slightly smaller than the outer diameter of the cable crimping part after the diameter reduction processing. Thus, when the cable crimping portion 5 undergoes the diameter reduction processing by the extrusion die, it is possible to prevent the extrusion die from acting on the screw shaft joint portion 7 and being subjected to the diameter reduction processing. In this embodiment, the sleeve main body 2 is manufactured by cutting out a single round bar and integrally forming a cable crimping portion and a screw shaft joint portion having different outer diameters. The screw shaft 10 has an appropriate length, an external thread 11 is formed on an outer peripheral portion thereof, a base end portion can be screwed into a screw hole of the screw shaft joint portion 7, and a tension nut is provided on the other end portion. It can be screwed together.

Next, a description will be given of an embodiment in which a composite cable made of high-strength and low-elongation fibers is fixed by the terminal fixing device of the present embodiment configured as described above. It is preferable that the buffer layer 16 be formed in the terminal portion of the composite cable 15 in which a plurality of carbon fibers, aramid fibers, and the like are aggregated, subjected to stranded wire processing, and then subjected to heat curing treatment in order to increase fixing efficiency. The buffer layer can be integrally formed by impregnating a high-strength low-elongation fiber with a thermosetting resin and press-molding the outer periphery of the fixing portion of the composite cable. The pressure bonding of the composite cable and the terminal fixing device is performed by a pressure bonding device having an extrusion die as shown in FIG. Crimping device 20
An extrusion die 21 in which the minimum inner diameter of the die hole 22 is smaller than the outer diameter of the sleeve main body 2 is fixed to the end of the frame 25, and a stork is provided on the extrusion die at least by a cable crimping portion of the sleeve main body 2. A jack 24 having a piston 23 longer than 5 is fixed to the other end.

First, the sleeve body 2 is positioned between the piston 23 and the extrusion die 21 so that the axis of the die coincides with the axis of the die. In this state, the end of the composite cable is inserted into the die hole 22 from the left in FIG. Then, the terminal portion is fitted and set in the cable fitting hole 4 of the cable crimping portion. Thereafter, when the jack 24 is operated, the sleeve main body 2 is gradually pressed in the die hole by the piston 23, is forcibly subjected to plastic working while passing through the die hole 22, is reduced in diameter, and is fitted in the cable fitting hole. The composite cable 15 is strongly gripped.

As described above, the crimp connection of the terminal portion of the composite cable is performed on the sleeve body, and then the screw shaft is screwed into the screw shaft joint of the sleeve body.
An anti-rotation process for preventing the cable from rotating due to torque, for example, by partially welding the screw shaft and the end of the screw shaft joint portion of the sleeve body, the fixing process of the cable end is completed. In order to fix and fix the cable obtained in this way, as shown in FIG. 5, the end of the screw shaft is made to penetrate through a hole formed in the supporting plate 30 as shown in FIG. The fixing can be performed by tightening the fixing member 26 and abutting the supporting member 26 on the supporting plate.

[0012]

The present invention has the following special effects. Since the screw shaft for tension fixing with the sleeve body is formed separately, the part receiving the compressive load for extrusion can be shortened, and the terminal fixing tool buckles even when receiving a strong compressive load. Therefore, it is possible to perform the diameter reduction processing with a high degree of processing. Then, the screw shaft may be screwed after the sleeve main body and the cable terminal are crimped and connected. Therefore, even if the screw shaft is long, the fixing tool can be easily crimped by a small extrusion crimping machine. Since the diameter of the sleeve is reduced by the extrusion die, the sleeve body receives uniform and strong diameter reduction from the entire circumference of the sleeve, and a much stronger crimping force is obtained compared to the conventional split die. Even if the compression bonding length is shortened, sufficient fixing efficiency can be obtained. Then, a composite cable made of high-strength low-elongation fiber
The cable is integrated with high-strength
Is provided with a buffer layer made of thermosetting resin.
The cutting edge formed on the inner surface of the cable fitting hole is directly
Damage the cable because it does not touch the surface
High fixing efficiency can be obtained over a long period of time.
In the case of claim 2, the joint portion is provided with a rotation preventing process.
Therefore, even if a torque is applied to the cable, the screw between the screw shaft and the cable shaft is not loosened, and a high degree of tension can be maintained.

[Brief description of the drawings]

FIG. 1 is an exploded front sectional view of a fixing device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view showing a crimp connection processing state.

FIG. 3 is a cross-sectional view in a state where a fixing tool is crimp-connected to a cable.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a partial cross-sectional front view in a state where the composite cable is tensioned and fixed.

FIG. 6 is a partial cross-sectional front view of a conventional fixing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Terminal fixing device 2 Sleeve body 4 Cable fitting hole 5 Cable crimping part 6 Screw hole 7 Screw shaft joint part 10 Screw shaft 15 Composite cable 16 Buffer layer 20 Crimping device 21 Piston 22 Extrusion die

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshihiro Abe 7-5-1, Higashi Narashino, Narashino City, Chiba Prefecture Inside Suzuki Metal Industry Co., Ltd. (56) References JP-A-63-99387 (JP, A) Sho Akai Kai 62-129099 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) D07B 9/00 E04C 5/08

Claims (2)

(57) [Claims] 1. High-strength, low-elongation material from a terminal fixing device
A method for fixing a terminal of a composite cable, comprising:
The fitting is a cable crimping part with a cable fitting hole
And a smaller diameter than the outer diameter of the cable crimping part after the diameter reduction processing.
Screw shaft coupling having an outer diameter and a screw hole formed inside
Body and a screw shaft joint
A screw shaft formed with a screw to be screwed into the screw hole of the section
And the composite cable is provided with a high strength
Impregnating the thermosetting resin into the low elongation fiber
And forming a buffer layer integrally with the composite cable in the cable fitting hole of the terminal fixing device.
Insert the terminal fixing part of the cable and crimp the cable in that state
Die with a minimum inner diameter smaller than the outer diameter of the cable crimping part
Reduce the diameter of the cable with an extrusion die having holes
Crimping connection of the cable terminal fixing part to the attachment part, and then
Screw the screw shaft to the screw shaft joint and connect
And fixing the other end of the screw shaft to a fixed object.
End of composite cable made of high strength low elongation material
End fixing method . 2. The thread of the sleeve body of the terminal fixing device.
The screw shaft joint part and the screw shaft
Anti-rotation processing to prevent the
2. The method of fixing a cable terminal according to claim 1, wherein
Law .