JP2992817B2 - Terminal treatment method for cable tension member and cable subjected to terminal treatment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a terminal of a tension member in a cable having a tensile strength and a cable. More specifically, the present invention relates to a structure in which the tension distribution of the tension members is made uniform so that the tension resistance performance can be improved .

[0002]

2. Description of the Related Art When the span of a cable (an overhead electric wire) is, for example, 50 m, a considerable tension is applied to each part due to the weight of the cable, and ordinary cables cannot withstand the tension. Conventionally, a cable is suspended on a messenger wire (branch line) installed along the cable to reduce the tension applied to the cable. However, this method has the drawback that the work of erection of the cable requires a great deal of work and the work efficiency is low. Therefore, in recent years, a so-called high-tension cable in which a tension member is built in the cable and the cable has a high tension has been developed and has become popular.

[0003] A general structure of a high-tension cable uses a polyaramid fiber such as Kevlar (trade name: DuPont) as a tension member, and this is circumferentially built inside the cable jacket. The ends of the tension member are treated at both ends of the cable so that the cable can exhibit the tension resistance performance of the tension member. The terminal processing of the tension member includes, for example, a method disclosed in JP-A-61-90102. In this method, a tension member is fixed to a terminal fitting together with other cable components by an adhesive. The work of erection of the high tension cable is performed as follows. First, as shown in FIG. 3, the work vehicle 100 on the cable feeding side and the work vehicle 101 on the traction side are arranged with the electric pole on which the cable is laid interposed therebetween. The delivery side work vehicle 100 includes:
A plurality of high-tension cables subjected to terminal treatment for providing fixing brackets 109 at both ends of a cable 102 having a predetermined length are wound up. Next, the extension wire 103 is attached to a fixing fitting 109 provided at the terminal of the cable 102 which has been subjected to the terminal treatment.
Are connected, and a utility pole 104 is
The cable 102 is pulled through the introduction roller 107 and the intermediate roller 108 provided on the upper portions of the power poles 105 and 106, and is bridged between the utility poles 104, 105 and 106. If the length of the erection section is longer than the predetermined length of the cable 102, the cable is connected to the next cable 102 by the connection fitting 110 on the payout side work vehicle 100 side, and is continuously erected. Thereby, the work of laying the cable can be efficiently performed.

[0004]

However, the high-tension cable formed by the above-mentioned conventional terminal treatment method includes:
There were the following issues. That is, in the above-mentioned terminal treatment method, since the tension members once separated are fixed to the terminal fittings, the tension distribution applied to each fiber of the tension members becomes uneven. In this case, among the many fibers, the wires are sequentially broken from the one to which the tension is applied intensively, and as a result, the sufficient tension resistance performance of the entire cable cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a cable having a tension member, the tension distribution of the tension member can be substantially equalized by a terminal treatment of the tension member, so that the cable as a whole has a sufficient strength. It is an object of the present invention to provide a method for treating a terminal of a tension member of a cable and a cable which has been subjected to a terminal treatment, capable of obtaining a tensile strength performance.

[0006]

Means of the present invention taken to achieve the above object are as follows. According to a first aspect of the present invention, there is provided a terminal treatment method for a tension member of a cable having a tension member built in between a cable jacket and a cable core, wherein a part of a distal end portion of the cable is left.
Peel off the jacket to the required length,
Corresponding to the required part of the exposed part of the
Attach the cylindrical fixing bracket, and insert the fixing bracket through the inlet of the fixing bracket.
Fill the gap between the fixture and cable core with elastic adhesive and cure.
And then strip off the remaining jacket at the end of the cable.
And a terminal processing method for the tension member of the cable.

According to a second aspect of the present invention, there is provided a method of processing a terminal of a tension member of a cable having a built-in tension member between a cable jacket and a cable core. Removing the tension member, fixing the required portion of the exposed portion of the tension member to the cable core with a fixture, cutting the tension member at an end portion side of the fixture, and removing the fixture portion. Folding back the tension member together with the tension member located inside the tension member to the cable core with a fixture, and including the folded back portion of the tension member with a tubular fixing member on the cable core. Arranging, a gap between the fixing member and the cable core In, characterized in that it comprises the step of filling the adhesive encloses the tension member, a terminal processing method of the tension member of the cable.

According to a third aspect of the present invention, there is provided a method for treating a tension member of a cable according to the first or second aspect, wherein a resin is filled outside the adhesive inside the fixing member. .

According to a fourth aspect of the present invention, in the cable tension member according to the first, second or third aspect, the adhesive is an adhesive which is elastically deformed by a pulling action. This is a terminal processing method.

[0010] In the fifth invention, an internal tension member between the cable jacket and cable core, a cable with one end treatment of the tension member, cable
Strip the jacket to the required length, leaving a part of the tip of the bull.
Peel off the intermediate part and expose the tension member
Attach a cylindrical fixing bracket to the required location
Of the fixture and the cable core from the inlet of the fixture.
Fill the gap with an elastic adhesive and cure it,
Includes a structure in which the rest of the jacket at the end of the cable
Characterized Mukoto a cable with one end treatment.

According to a sixth aspect of the present invention, there is provided a cable in which a tension member is built in between a cable jacket and a cable core, and the terminal of the tension member is processed. Remove the jacket to expose the tension member, fix the required portion of the exposed portion to the cable core with a fixing tool, cut the tension member at the end side from the fixing tool, fold it at the fixing tool part, and turn it back The tension member is fixed to the cable core with a fixture together with the tension member located inside the tension member, and a tubular fixing member is disposed on the cable core including the folded portion of the tension member, and It is characterized by including a structure in which the tension member is included in a gap between the cable core and an adhesive. To a cable with one end treatment.

A seventh aspect of the present invention is characterized in that a resin is filled outside the adhesive inside the fixing member.
It is a cable subjected to terminal processing according to the sixth invention.

According to an eighth aspect of the present invention, there is provided the cable having been subjected to the terminal treatment according to the sixth or seventh aspect, wherein the adhesive is an adhesive which is elastically deformed by a pulling action. .

According to a ninth aspect, in the sixth, seventh or eighth aspect, the fixing member is provided with an engagement means capable of engaging with an adhesive or a resin. A cable that has undergone such terminal processing.

The cable to which the present invention is applied has a structure in which the tension member is provided inside the outer jacket, for example, between the outer jacket and the cable core, but is not limited to this. The tension member may be a braided member, a vertically attached member in which fibers are simply arranged in parallel with the length direction, or a horizontally wound member.

(Operation) In the terminal processing method according to the first invention and the cable according to the fifth invention, the tension member exposed by removing the jacket is made of an adhesive filled in the fixing member. It is hardened and fixed to the cable core. Accordingly, the tension applied to the tension member when both ends of the cable are supported by the fixing member is substantially equally shared by the fibers by solidifying the tension member with the adhesive. Also, when removing the cable jacket,
Of the end of the terminal member
Peel off the required length and remove the tension member.
They are exposed. According to this, the exposed part
Minute tension member pitch and tension are elastic
It is kept in the state at the time of cable manufacturing until it is included in the adhesive,
Since the tension members are not disturbed,
The tension applied to each fiber of the fiber can be equalized more reliably.
Tension performance is improved.

In the terminal treatment method according to the second invention and the cable according to the sixth invention, the tension member is folded back to increase the contact area with the adhesive, and the cable core is further fixed by the fixture. Is fixed to
The retention strength of the tension member can be improved. Therefore, based on the strength of the terminal processing unit,
With the same strength, the terminal processing unit can be made shorter and more compact.

In the terminal processing method according to the third invention and the cable according to the seventh invention, since the resin is filled outside the adhesive inside the fixing member, the amount of the adhesive used is reduced. And the manufacturing cost can be reduced.

In the terminal treatment method according to the fourth invention and the cable according to the eighth invention, since the adhesive is an adhesive which is elastically deformed by a pulling action, for example, the tension member is hardened after the adhesive is cured. Even when each of the fibers is not aligned and there is a variation in the tension distribution, the adhesive in the portion where the fiber that is initially tensioned is buried is elastically deformed and stretched, so that the tension applied to the fiber can be reduced. . And when tension is applied to other fibers,
Tension is distributed to each fiber. In addition, the terminal processing portion of the cable has excellent strength against an impact load of the adhesive portion and is not easily broken.

In the cable according to the ninth aspect of the present invention, since the fixing member is provided with the engaging means capable of engaging with the adhesive or the resin, after the adhesive or the resin is hardened, the engaging means is not used. The engagement and the fixation between the fixing member and the adhesive or the resin can be further enhanced.

[0021]

Embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 shows a first embodiment of a cable according to the present invention, and is an explanatory diagram showing a structure of a terminal processing unit of a tension member. In the figure, C1 is a cable, 1 is a jacket, 2 is a cable core, 3 is a braided tension member, 6 is an elastic adhesive layer, 7 is a fixing member as a fixing member, 70 is an inlet, and 10 is a tape. is there.

Referring to FIG. 1, a method of cable terminal processing will be described. In addition, the cable C1 to be used is braided with a tension member 3 using Kevlar (trade name: DuPont) and is circumferentially enclosed between the cable core 2 and the jacket 1. (1) The jacket 1 is peeled off at a required length while leaving a part of the end of the cable C1, so-called intermediate peeling. At this time, care should be taken so that the tension member 3 is not damaged and the braid is not disturbed, and the pitch and the tension of the tension member 3 are kept in the state at the time of manufacturing the cable. When the intermediate stripping is performed, the length of the remaining sheath from the cable tip to the cable tip side end of the intermediate strip is, for example, 2c.
m or more, the jacket 1 is removed and the tension member 3
The pitch and tension of the tension member 3 after exposing are maintained in the state at the time of cable manufacturing until the terminal treatment is completed.

(2) A tubular fixing member 7 is fitted to a required portion of the exposed portion of the tension member 3. An inlet 70 is provided on the peripheral wall of the fixing member 7. If two or more injection ports 70 are provided, it is not necessary to limit the position of the injection port 70 when the fixing bracket 7 is attached, and processing workability is improved. Therefore, in practice, the injection ports 70 are provided at four locations. That is enough. Further, when the injection port 70 is provided at two or more places, the injection port 7 which does not substantially serve as the injection port is provided.
0 is closed with a tape 10 in advance. The step formed by the thickness of the injection port 70 constitutes an engaging means for engaging with the epoxy adhesive 6 described later. (3) The tension member 3 is included in the gap between the fixing bracket 7 and the cable core 2 from the unblocked injection port 70, and an epoxy-based adhesive (AW106 in this example) is an elastic adhesive. : Chibakai) 6 is filled and cured. Then, the remainder of the jacket 1 at the end of the cable C1 is peeled off. The epoxy adhesive used has good adhesion to Kevlar as a tension member, and has a soft hardness after curing (hardness Shore D40: AW106), but is not limited thereto. The hardness is appropriately selected depending on the weight of the cable and the like. In addition,
In the above process, if necessary, the tension member 3, the fixture 4, and the fixture 7 can be degreased using acetone or the like.

(Operation) The operation of the present embodiment will be described with reference to FIG. In the cable C1 according to the present invention, the tension member 3 exposed by removing the jacket 1 is fixed to the cable core 2 by being fixed by the elastic adhesive layer 6 filled in the fixing metal 7, so that the fixing metal 7 The tension applied to the tension member 3 of the cable C1 when supported by the above is substantially equal for each fiber. Even if the tension distribution applied to the tension member 3 varies somewhat among the fibers, the elasticity of the elastic adhesive layer 6 allows the tension to be distributed substantially even to the fibers that originally have a low tension distribution.

When the jacket 1 is removed, a part of the cable tip is left, that is, if the so-called intermediate peeling is performed, the cable and the pitch of the tension member 3 at the exposed portion are covered with the elastic adhesive 6. Since the tension member 3 is maintained in the state at the time of manufacture and the tension member 3 is not disturbed, the tension applied to each fiber of the tension member 3 can be more reliably equalized, and the tension resistance performance is further improved.

FIG. 2 shows a second embodiment of the cable according to the present invention, and is an explanatory view showing the structure of a terminal processing section of a tension member. In FIG. 2, C2 is a cable, 1
Is a jacket, 2 is a cable core, 3 is a braided tension member, 30 is a folded tension member, 4, 5
Is a fixture, 6 is an elastic adhesive layer, 7 is a fixture, 70 is an injection port, 8 is a resin, 9 is a leakage prevention lump, and 10 is a tape.

Referring to FIG. 2, a method of cable terminal processing will be described. The cable C2 to be used is a braided tension member 3 using Kevlar (trade name: DuPont) and is circumferentially enclosed between the cable core 2 and the jacket 1. (1) The jacket 1 is peeled off at a required length while leaving a part of the distal end portion of the cable C2, so-called intermediate peeling. At this time, care should be taken so that the tension member 3 is not damaged and the braid is not disturbed, and the pitch and the tension of the tension member 3 are kept in the state at the time of manufacturing the cable. When the intermediate stripping is performed, the length of the remaining sheath from the cable tip to the cable tip side end of the intermediate strip is, for example, 2c.
m or more, the jacket 1 is removed and the tension member 3
As described above, the pitch and the tension of the tension member 3 after exposing can be maintained in the state at the time of cable manufacturing until the terminal treatment is completed.

(2) Of the exposed portion of the tension member 3, for example, a position of 20 mm from the end of the original jacket 1 is fixed to the cable core 2 by tightening with a fixing tool 4 (a soft copper wire: φ1 mm in this example). I do. (3) Strip off the remainder of the jacket 1 at the end of the cable C2. (4) The tension member 3 on the cable tip side from the fixture 4 is cut at a predetermined length, and the tension member 3 is folded back at the fixture 4 portion.

(5) The folded tension member 30
Together with the tension member 3 included therein, is fixed to the cable core 2 by winding with a fixture 5 (in this example, soft copper wire: φ1 mm) at a position of, for example, 5 mm from one end of the jacket. (6) The folded tension member 30 and the tension member 3 contained therein are encapsulated and coated with an epoxy-based adhesive (AW106: chikagaiki in this example), and elastically reduced to a diameter smaller than the diameter of the jacket 1. Providing an adhesive layer 6,
Let it cure.

(7) A tubular fixing member 7 having an outer diameter set to be the same as that of the jacket 1 is fitted with the elastic adhesive layer 6 included therein.
Both ends are closed with a leakage prevention mass 9 for preventing leakage of the resin. An inlet 70 is provided on the peripheral wall of the fixing member 7. Inlet 7
When two or more 0s are provided, it is not necessary to limit the position of the injection port 70 when the fixture 7 is attached, and the processing workability is improved. It is enough. When the injection port 70 is provided at two or more locations, the injection port 70 that does not substantially become the injection port is closed with the tape 10 in advance. (8) The epoxy resin 8 (XN1067: chibaikiki in this example) from the injection port 70 where the fixing metal 7 is not closed.
And filling the injection port 70 with the tape 10. Then, the resin 8 is cured, and the fixture 7 and the elastic adhesive layer 6 are integrated with the resin 8. In the above step, if necessary, the tension member 3, the fixture 4, and the fixture 7 can be degreased using acetone or the like.

(Operation) The operation of the present embodiment will be described with reference to FIG. Jacket 1
Since the tension member 3 which has been removed and exposed is fixed to the cable core 2 by being fastened by the fixing members 4 and 5, the tension member 3 is not disturbed on the base side than the fixing members 4 and 5. And, since the cable C2 is fixed to the cable core 2 by being fixed by the elastic adhesive layer 6 filled in the fixing member 7, the tension applied to the tension member 3 when the cable C2 is supported by the fixing member 7, Substantially even. In addition, even if the tension distribution applied to the tension member 3 varies somewhat among the fibers, the elasticity of the elastic adhesive layer 6 allows the tension to be distributed substantially evenly to the fibers that originally have a low tension distribution. it can.

The tension member 3 on the end side from the fixture 4
Is cut and folded back at the fixture 4, and the folded tension member 3 is fixed to the cable core 2 with the fixture 5 together with the tension member 3 included therein, so that the retaining strength of the tension member is improved. ing. Therefore, based on the strength of the processing portion, the terminal processing section can be made short and compact with the same strength.

Since the elastic adhesive layer 6 is provided so as to enclose the folded tension member 30 and the tension member 3 included therein, the tension sharing applied to the tension member 3 in the above-mentioned structure is slightly increased in each fiber. Even if there is a variation, the tension can be substantially evenly distributed even to the fiber which originally has a small tension distribution by the action of the elastic adhesive layer 6.

The terms and expressions used in the present specification are for explanation only, are not restrictive, and do not exclude terms and expressions equivalent to the above-mentioned terms and expressions. Further, the present invention is not limited to the illustrated embodiment, and various modifications are possible within the scope of the technical idea.

[0035]

The present invention has the above configuration and has the following effects. (A) In the terminal processing method according to the first aspect and the cable according to the fifth aspect, the tension member exposed by removing the jacket is hardened with an adhesive filled in the fixing member to form a cable core. It is fixed. Accordingly, the tension applied to the tension member when both ends of the cable are supported by the fixing member is substantially equally shared by the fibers by solidifying the tension member with the adhesive. Also, when removing the cable jacket,
Of the end of the terminal member
Peel off the required length and remove the tension member.
They are exposed. According to this, the exposed part
Minute tension member pitch and tension are elastic
It is kept in the state at the time of cable manufacturing until it is included in the adhesive,
Since the tension members are not disturbed,
Equalization of tension that written on each fiber bar can be more reliably withstand
Tension performance is improved.

(B) In the terminal processing method according to the second aspect and the cable according to the sixth aspect, the tension member is folded back, the contact area with the adhesive is increased, and the cable core is further fixed by the fixture. Is fixed to
The retention strength of the tension member can be improved. Therefore, based on the strength of the terminal processing unit,
With the same strength, the terminal processing unit can be made shorter and more compact.

(C) In the terminal processing method according to the third aspect and the cable according to the seventh aspect, since the resin is filled outside the adhesive inside the fixing member, the amount of the adhesive used is reduced. And the manufacturing cost can be reduced.

(D) In the terminal processing method according to the fourth aspect and the cable according to the eighth aspect, since the adhesive is an adhesive that is elastically deformed by a tensile action, for example, the tension is set after the adhesive is cured. Even when the fibers of the member are not aligned and the tension distribution varies, the adhesive in the part where the fiber that is initially tensioned is buried is elastically deformed and stretched, so that the tension applied to the fiber can be reduced. it can. Then, when tension is applied to other fibers, the tension is dispersed to each fiber, and the tensile strength performance of the cable is improved. In addition, the terminal processing portion of the cable has excellent strength against an impact load of the adhesive portion and is not easily broken.

(E) In the cable according to the ninth aspect, since the fixing member is provided with the engaging means capable of engaging with the adhesive or the resin, the cable is engaged after the adhesive or the resin is hardened. By engaging with the means, the fixing between the fixing member and the adhesive or the resin can be further enhanced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of a cable according to the present invention and showing a structure of a terminal processing unit of a tension member.

FIG. 2 is an explanatory diagram showing a second embodiment of the cable according to the present invention and showing a structure of a terminal processing unit of a tension member.

FIG. 3 is an explanatory view of a cable erection work.

[Explanation of symbols]

 C1, C2 Cable 1 Jacket 2 Cable core 3 Tension member 30 Folded tension member 4, 5 Fixture 6 Elastic adhesive layer 7 Fixture 70 Injection 8 Resin 9 Leak prevention lump 10 Tape

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toru Matsumura 1-3-1 Shimaya, Konohana-ku, Osaka-shi, Osaka Sumitomo Electric Industries, Ltd. (72) Takashi Tanaka 1-1-1, Shimaya, Konohana-ku, Osaka-shi, Osaka No. 3 Sumitomo Electric Industries, Ltd. Inside (56) References Japanese Utility Model Sho 57-130518 (JP, U) Japanese Utility Model Sho 55-94125 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB (Name) H02G 1/14

Claims (9)

(57) [Claims] 1. A method for treating a tension member of a cable having a built-in tension member between a cable jacket and a cable core, wherein the sheath is stripped to a required length while leaving a part of a cable end portion.
The so-called intermediate strip, and expose the tension member
Fits a cylindrical fixing bracket corresponding to the required part of the minute
And remove the space between the fixture and the cable core from the inlet of the fixture.
Fill the gap with an elastic adhesive, cure it, and then
A terminal treatment method for a tension member of a cable, characterized by stripping off the remaining jacket at the tip . 2. A method for treating a tension member of a cable having a built-in tension member between a cable jacket and a cable core, the method comprising: removing a jacket at a portion where the tension member is treated to expose the tension member; Fixing the required portion of the exposed portion of the tension member to the cable core with a fixing tool, cutting the tension member at an end side from the fixing tool, and turning it back at the fixing tool portion; Fixing the tension member to the cable core with a fixing tool together with the tension member located inside the tension member; disposing a tubular fixing member on the cable core including a folded portion of the tension member; In the gap between the cable core and Filling the adhesive by enclosing the member,
A terminal treatment method for a tension member of a cable. 3. The terminal treatment method for a tension member of a cable according to claim 1, wherein the outside of the adhesive inside the fixing member is filled with a resin. 4. The terminal treatment method for a cable tension member according to claim 1, wherein the adhesive is an adhesive that elastically deforms with a pulling action. 5. A cable in which a tension member is built in between a cable jacket and a cable core and the terminal treatment of the tension member is performed, and the jacket has a required length except for a part of the end of the cable. Stripped in
The so-called intermediate strip, and expose the tension member
Fits a cylindrical fixing bracket corresponding to the required part of the minute
At the same time, fix the fitting and cable core from the inlet of the fitting.
Fill the voids with an elastic adhesive to cure it,
After that, the remainder of the jacket at the end of the cable was stripped off
A cable that has been subjected to terminal treatment , characterized by including: 6. A cable in which a tension member is built in between a cable jacket and a cable core, and the terminal of the tension member is subjected to a terminal treatment. Is exposed, a required portion of the exposed portion is fixed to a cable core with a fixture, the tension member is cut at an end portion side from the fixture, and the tension member is folded back at the fixture portion. The tension member is fixed to the cable core with a fixing member together with the tension member located inside the tension member, and a cylindrical fixing member is arranged on the cable core including the folded portion of the tension member, and a gap between the fixing member and the cable core is provided. A terminal part including a structure in which the tension member is included and an adhesive is filled therein. Cable. 7. The terminal-treated cable according to claim 6, wherein a resin is filled outside the adhesive inside the fixing member. 8. The terminal-treated cable according to claim 6, wherein the adhesive is an adhesive that elastically deforms in accordance with a pulling action. 9. The terminal-treated cable according to claim 6, wherein the fixing member includes an engaging means capable of engaging with an adhesive or a resin.