JP3462923B2 - Terminal fixing method of multilayer fiber composite cable - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer fiber composite cable suitable for a stranded wire type multi-layer structure among fiber composite cables used as a tension material for structures or a concrete reinforcing material in the field of civil engineering. The present invention relates to a terminal fixing method.

[0002]

2. Description of the Related Art A multilayer fiber composite cable is formed of a bundle of carbon fibers, polyamide fibers, glass fibers, etc. impregnated with a thermosetting resin such as epoxy resin and bundled together. 1 x formed by twisting
A two-layer fiber composite cable with a 1 × 19 structure in which a single-layer fiber composite cable with 7 structures (see FIG. 3A) is used as a core layer 1 and twelve strands b are twisted around the core layer to form an outer layer 2. (See FIG. 3B), a three-layer cable having a 1 × 37 structure (see FIG. 3C) in which 18 outer strands c are further twisted around the two-layer fiber composite cable to form the outer layer 3. . These multi-layer fiber composite cables are high-capacity cables that have higher breaking loads than single-layer cables, and are significantly lighter than wire cables and have excellent corrosion resistance.

For fixing the end of a multi-layer fiber composite cable, a fixing method in which the end of the cable is directly inserted into a metal sleeve and a resin adhesive (thermosetting resin) is injected between the ends to fix the cable, A fixing method has been developed in which each strand of the terminal portion is untwisted and inserted into a sleeve, and a resin adhesive is injected between the strands and fixed to increase the fixing load (Japanese Utility Model Laid-Open No. 3-120598). etc).

[0004]

In the conventional fixing method for the terminal of the multi-layer fiber composite cable, the fixing method in which the cable end portion is directly inserted into the sleeve has a limit in the fixing load and is relatively low in load. However, there is a problem that the cable end may come off. Further, the fixing method of untwisting each of the above strands and inserting it into the sleeve is
It is necessary to untwist the entire strand, and the mutual spacing between layers and each strand, that is, the filling of the resin adhesive easily fluctuates, the fixing load cannot be fully exerted, the outer diameter of the terminal fixing part (sleeve) becomes large, etc. There are challenges.

The object of the present invention is to untwist the outer layer strands, spacers ( spacer wall thickness d1 and outer layer strands ).
Ratio of the land diameter do to d1 / do is within 0.7 ± 0.2 range
Interposed formation), the injection of the resin adhesive or expansion adhesives, Ke
The fitted and secured in the sleeve Buru terminal unit, fixing load of the cable terminal portion is effectively increased by Aimatsu the wedge effect of the spacer becomes easy to form the terminal fixing portion, also, significantly compact the end end fixing portion Accordingly, the present invention provides a method for fixing a terminal of a multi-layer fiber composite cable in which terminal fixing performance and reliability are remarkably improved.

[0006]

The present invention has the above-mentioned object.
To solve the problem, by untwisting the respective strands of the outer layer of <br/> cable terminal portion in the multilayer type fiber composite cable, space
Ratio of the wall thickness d1 of the surfacer to the strand diameter do of the outer layer d1
Insert a ring-shaped spacer formed with / do in the range of 0.7 ± 0.2 below the untwisted strand.
Insert it and untwist it to the upper side of the spacer, inject a resin adhesive between the spacer before and after the untwisting of the above-mentioned untwisted strands and the spacer, and at the same time, squeeze the three ends to the cable end.
Another object of the present invention is to provide a terminal fixing method for a multilayer fiber composite cable, which is characterized by fitting and fixing a cable.

Further, in the terminal fixing method for a multilayer type fiber composite cable, it is characterized in that an expansion adhesive is injected instead of the resin adhesive to fix the cable end portion in the sleeve. is characterized thereby Yotsute forming the spacer in the synthetic resin, the scan pacer to be placed within at least one twist pitch from the cable top terminal.

[0008]

[Function] Spacer wall thickness d1 and outer layer strand diameter d
Form the ratio d1 / do with o within the range of 0.7 ± 0.2
The ring-shaped spacer is a multi-layer fiber composite cable.
Each is untwisted outer cable terminal portion of Sutoran
Inserted into the lower side of the spacer and twisted back to the upper side of the spacer, while injecting a resin adhesive between the spacer and the gap between the strands before or after the twist back and the spacer, In the multilayer fiber composite cable, by fitting and fixing the sleeve ,
The spacing is formed to the desired value, the spacers are inserted and arranged with high precision , and the strength of the strand is not particularly damaged.
With this, the resin adhesive injected between the strands and the spacer does not have any particular variation, and is evenly effective.
In combination with the wedge effect of the spacer, the fixing force, that is, the fixing load is effectively increased, and excellent terminal fixing performance and reliability are obtained. In addition, the terminal fixing unit is significantly made compact (the length is shortened and the diameter is reduced).

Further, by injecting an inflation adhesive in place of the resin adhesive, expansion adhesive is moderately expanded between each strand during curing, it further enhanced filling accuracy of adhesive, each Strand and sleeve fixing force
The fixing load and reliability are further improved. Further, by using a spacer as a synthetic resin, the injection of adhesive and the fixability are further enhanced, and by disposing the spacer within one twist pitch from the cable outermost end, the sleeve is prevented from coming off and the fixing force is improved. In addition, the terminal fixing performance and reliability are further improved.

[0010]

FIG. 1 shows one embodiment of the present invention, and FIG. 2 shows each embodiment of a spacer. In the figure, 1 is a core layer formed by twisting 7 strands a in which a resin bundle is impregnated into a fiber bundle of carbon fibers or the like, 2 is an outer layer formed by twisting 12 similar strands b, 5 Is a multilayer fiber composite cable formed of a core layer and an outer layer, 5a is a cable end portion of the multilayer fiber composite cable, 6 is a ring-shaped spacer of the first embodiment inserted between the core layer and the outer layer, 16 Is a ring-shaped spacer of the second embodiment similarly inserted between layers, and 7 is each outer strand b formed on the outer periphery of the spacer 16.
Is a fitting concave portion, 8 is a sleeve fitted and integrally fixed to the cable end portion, do is a diameter of each strand of the outer layer, and d1 is a thickness of the spacer.

In the illustrated first embodiment, each strand 6 (or 16) of the outer layer 2b of the cable end portion 5a of the multilayer fiber composite cable 5 is untwisted to have a spacer thickness d1.
The ratio d1 / do of the outer layer strand diameter do to 0.7 ±
Ring spacer 6 formed in the range of 0.2
(Or 16) is the lower side of the untwisted strand b
And untwisted to the upper side of the spacer .
Gap and spacers scan Portland a before or after the untwisted
Between the cable end and the resin adhesive.
This is a terminal fixing method for a multilayer fiber composite cable characterized in that the sleeve 8 is fitted and fixed to the end portion 5a.

In the second embodiment, in the terminal fixing method for the multilayer fiber composite cable, an expansion adhesive is injected instead of the resin adhesive to fix the cable terminal portion 5a in the sleeve 8. This is a terminal fixing method for a multi-layer fiber composite cable, which is characterized in that

A third embodiment, in the terminal fixing method of the multilayer type fiber composite cable, the spacer 6 (or 16) is by connexion formed synthetic resin, scan pacer 6
(Or 16) is arranged within at least one twist pitch from the outermost end of the cable, which is a terminal fixing method for a multilayer fiber composite cable.

More specifically, the illustrated multilayer fiber composite cable 5 is formed by impregnating a fiber bundle of carbon fibers, polyamide fibers, glass fibers or the like with a resin adhesive (thermosetting resin) such as epoxy resin. strand a, is composed of b, is decreased to the two-layer structure consisting of an outer layer 2 which is formed on the core layer 1 and the core layer twisted 12 strands b formed by twisting seven strand a.

The spacers 6 and 16 are preferably formed of a synthetic resin such as vinyl chloride or the like in a soft or soft rigid material into a short ring-shaped cylindrical shape, and the inner diameter is set to the outer diameter of the core layer 1 of the cable terminal portion 5a. Correspondingly, spacer thickness d1 and outer layer 2
Ratio of the strand diameter do to d1 / do is 0.7 ± 0.2
It is formed in the range of. These spacers 6 and 16 are
Inserted between each strand a and b of the outer layer of the core layer 1 and the outer layer 2.
Is input, inserted between each strand a and between each strand b
Is input, Ru moderate clearance (e.g. 2~3mm about spacer) both moderate gaps in between each other each strand b are formed is formed between each strand a and b. Also,
The spacer 6 (see FIGS. 2A and 2B) is the first embodiment in which the inner and outer peripheral surfaces are not provided with any particular unevenness, and the respective strands b of the outer layer 2 are desired relative to each other and to the strand a of the core layer 1. Spaced and placed. Spacer 16 (Fig. 2C,
(See D) is a concave portion 7 corresponding to the number of strands b of the outer layer 2.
Are provided on the outer peripheral surface at appropriate intervals to further improve the accuracy of forming the gap between the strands b.

The sleeve 8 is formed of a steel pipe made of carbon steel or alloy steel having a strength of 30 kgf / mm 2 or more, a stainless steel pipe having excellent corrosion resistance, and a pipe material made of lightweight fiber reinforced plastic, etc., having an appropriate diameter and length. ,
Corresponding to the outer diameter of the core layer 1 of the cable terminal portion 5a so that the resin adhesive (thermosetting resin) such as epoxy resin or the expansion adhesive can be injected even when the spacers 6 and 16 are inserted. With a corresponding inner diameter, there is a space between the core layer 1 of this cable end 5a and each strand b of the untwisted outer layer 2 .
The pacers 6 and 16 are inserted, and the sleeve 8 is fitted and fixed by the injected adhesive. If necessary, it is also possible to further increase the fixing force by fitting the sleeve 8 and then compressing it with an appropriate compression ratio (= sleeve diameter after compression / sleeve diameter before compression = 93 to 95%). .

As the resin adhesive, a thermosetting resin such as an epoxy resin which has good adhesiveness to both the fiber composite cable and a pipe material such as a steel pipe or a fiber reinforced plastic and has a relatively small shrinkage ratio after curing is used. Applied. Instead of the expansion adhesive, for example, a cement-based expansion material that reacts and expands in volume is also applicable, and it is also possible to apply a system expansion material such as quick lime, calcined dolomite, or a mixture thereof. The adhesive can be injected into the cable end portion 5a even after the spacers 6 and 16 are fitted.

In the illustrated multi-layer fiber composite cable 5, each strand b of the outer layer 2 of this cable end portion 5a
Is untwisted, the spacers 6 or 16 are fitted on the core layer 1, and the untwisted strands b are placed above the spacers.
Are untwisted to form an appropriate gap between the core layer 1 and the outer layer 2 and between each strand b of the outer layer, and the resin adhesive is injected before or after untwisting of each strand b. When the sleeve 8 is fitted on the cable terminal portion 5a, the resin adhesive is hardened and integrated in the sleeve 8. If necessary, the sleeve 8 is compressed by a press or the like and fixed to the cable end portion 5a to easily form a terminal fixing portion.

In the terminal fixing section, the ring-shaped spacers 6 and 16 having the above-mentioned structure are easily interposed between the core layer 1 and the outer layer 2 so that the strands b of the outer layer 2 are forcibly separated from each other. As a result, a required appropriate gap is accurately formed between the layers and between the strands, and the injection accuracy of the resin adhesive is improved. Spacer 6,16 having the above-mentioned structure
Shows a decrease in strength without damaging the strand b.
The cable terminal portion 5a is effectively reinforced and fixed together with the cured resin without being pulled up . Therefore,
Together with the wedge effect of the spacers 6 and 16, the fixing force of the sleeve 8 is effectively increased, and the resin adhesive is injected.
Excellent terminal fixing performance and reliability that are stable with little variation such as insertion . In the case of the spacer 16, the gap formation between the strands b and the injection accuracy of the adhesive are further improved.

Further, when the expansion adhesive is injected instead of the resin adhesive, the expansion adhesive expands at the time of curing, the filling of the adhesive and the bonding accuracy are further enhanced, and the reliability of terminal fixing is enhanced. Further, when the spacers 6 and 16 are made of synthetic resin, the strands a and b and the sleeve 8 are more effectively bonded and integrated. By arranging the spacer within at least one twist pitch from the outermost end of the cable, the removal of the sleeve 8 is prevented and the wedge effect and the like are effectively exhibited.
Reliability is further enhanced.

The samples shown in Table 1 are 1 × 19 (25.0 mm
In the double-layer carbon fiber composite cable of φ structure, the terminal fixing portion in which the cable terminal portion is directly inserted into the metal sleeve, and the thermosetting epoxy resin and the expansion material are injected and fixed, in the conventional example 1, The conventional example 2 is the terminal fixing part in which the whole strand of the cable end is untwisted and inserted into the metal sleeve, and the epoxy resin and the expansion material are injected to fix it (Actual Kaihei 3-120598). Only the outer layer strand of the part is untwisted, the ring-shaped synthetic resin spacer 6 having the above-mentioned configuration is inserted between the layers, the epoxy resin and the expansion material are injected, and the terminal fixing part in which the metal sleeve is fitted is used in Example 1. In addition, the terminal fixing portion formed by interposing the synthetic resin spacer 16 is set as the second embodiment, and the nuts are screwed and fixed to the screws provided on the outer circumferences of the metal sleeves of each of these samples, and the tensile tester is used. Each trial Evaluation of Table 1 were obtained the fixing load of measured.

[0022]

[Table 1]

As can be seen from the display, the terminal fixing portions of the first and second embodiments of the present invention are the same as those of the first and second conventional examples.
However, even if the outer diameter and the length of the sleeve 8 are formed to be extremely small, the fixing load is significantly increased. There is no problem with respect to the durability of the fixing load, and even if the terminal fixing portion is made extremely compact, the fixing load is remarkably increased, and the terminal fixing portion is totally superior to conventional products. In addition to the display, many samples were manufactured to obtain the same evaluation. Although the illustrated embodiment is a two-layer fiber composite cable, it has been confirmed that the same action and effect can be obtained by being applied to a three-layer fiber composite cable and further a multilayer fiber composite cable.

[0024]

INDUSTRIAL APPLICABILITY The present invention is constructed as described above, and in the multilayer fiber composite cable, the outer strand of the cable end portion is untwisted, and the ring-shaped spacer ( spacer meat) is used.
The ratio of the thickness d1 to the strand diameter do of the outer layer d1 / do =
The terminal fixing portion is easily formed at the cable end portion by the steps of interlayer insertion ( formed in the range of 0.7 ± 0.2 ), injection of the adhesive, and fitting to the sleeve, and the wall thickness d1 of the spacer is
Ratio of outer layer strand diameter do : d1 / do = 0.7 ±
The ring-shaped spacer formed in the range of 0.2 is provided on the outside of the cable end portion of the multilayer fiber composite cable .
Spacer inserted under each untwisted strand
Is untwisted on the upper side of the
The strength of the strands is effectively exhibited without being damaged, the spacing between the strands is accurately formed, the injection of the resin adhesive is optimized, and the sleeve end effect is achieved by fitting the sleeve to the cable end and fixing it. There are effectively exhibited effectively high Merare fixing load is no variation Te excellent terminal fixing performance, reliability can be obtained. In addition, the terminal fixing part (sleeve) is extremely compact (significantly short length
Its excellent terminal fixing performance, reliability, etc.
The sex has been confirmed by experiments.

By injecting the expansion adhesive instead of the resin adhesive, the fixing force, that is, the fixing load and reliability of each strand and the sleeve can be further improved. Furthermore, by using a synthetic resin for the spacer, the injection of adhesive and the fixing force can be further enhanced, and by disposing the spacer within one twist pitch from the cable outermost end, the sleeve can be effectively prevented from being pulled out. , The adhesion is further increased. Overall, the terminal fixing performance and reliability are further improved.

[Brief description of drawings]

FIG. 1 is a side view (A) showing an embodiment of the present invention and a cross-sectional view (B) of a cable terminal portion.

FIG. 2 is a front view (A) and a vertical sectional view (B) showing a first embodiment of a spacer, and a front view (C) and a vertical sectional view (D) showing a second embodiment.

FIG. 3 is a sectional view (A) of a single-layer fiber composite cable, a sectional view (B) of a two-layer fiber composite cable, and a sectional view (C) of a three-layer fiber composite cable.

[Explanation of symbols]

a, b strand 1 core layer 2 outer layer 5 Multi-layer fiber composite cable 5a Cable end 6,16 spacer 8 sleeves do strand diameter d1 Spacer thickness

Claims (3)

(57) [Claims] 1. A multi-layer fiber composite cable, wherein each strand of the outer layer of the cable end portion is untwisted to form a spacer.
The ratio d1 / do of the wall thickness d1 and the strand diameter do of the outer layer is
Insert a ring-shaped spacer formed in the range of 0.7 ± 0.2 into the lower side of the untwisted strand to insert a spacer .
And untwisted on the upper side of the pacer, while injecting resin adhesive between the gap and the spacer strands before or after the untwisted, fit the sleeve to the cable terminal portion
Terminal fixing method of a multilayer fiber composite cable characterized by fixation with instrumentation. 2. The method of fixing a terminal of a multilayer fiber composite cable according to claim 1, wherein an expansion adhesive is injected instead of the resin adhesive to fix the cable end portion in the sleeve. Method for fixing terminal of multi-layer fiber composite cable. 3. A terminal fixing method for a multilayer type fiber composite cable according to claim 1 or claim 2, as well as Yotsute forming the spacer in the synthetic resin, at least one twisted scan pacer from the cable top terminal pitch A terminal fixing method for a multi-layer fiber composite cable, which is characterized in that it is arranged within.