JP3185822B2 - Composite rope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial rope which can be used in large structures such as railway overhead lines and bridges.

[0002]

2. Description of the Related Art Conventionally, metallic wire ropes have been used for cables for bridges and ropes for electrical installation. However, it is difficult to handle the wire rope due to its heavy weight, and when the cable is shaken by wind power or the like, the vibration energy is large, and it is necessary to design the span and structure of the strut corresponding to the vibration energy. The use of lightweight and flexible synthetic fibers may be considered in order to solve such disadvantages, but there is a problem that the rigidity and dimensional stability against compression from the side at the attachment part of the branch line are not sufficient, and use in such applications is limited. It had been.

[0003] Accordingly, a composite rope in which the exterior is covered with metal fibers which are resistant to compression from the side by using more lightweight and high-strength organic fibers for the inner layer than ordinary wire ropes has been tried, but has been available until now. Materials such as aramid fibers and high-strength polyarylate fibers have insufficient elasticity compared to high-strength metal fibers, so the strength of the resulting composite rope can be sufficiently high, but metal cables of similar thickness However, the elastic modulus was low and the dimensional stability was inferior. That is, even if a composite rope with a metal fiber is formed, stress concentration always occurs on the metal fiber. In particular, in order to enhance the dimensional stability, the diameter of the rope had to be increased because the contribution of the organic fibers was small. Such composite ropes have not been used for such reasons.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal / organic composite rope which is lightweight, excellent in handling, and has extremely high strength and high elastic modulus.

[0005]

That is, according to the present invention, a polybenzbisoxazole fiber having a tensile strength of at least 4.0 GPa or more and an initial tensile modulus of at least 140 GPa is disposed inside, and the outside thereof is formed of a metal wire layer. It is a rope provided with.

[0006] As the metal fibers used in the present invention, hard steel wires, stainless steel fibers and the like are used. Further, a composite rope with higher performance can be obtained by combination with a material having higher strength. The present invention is not limited by the type and form of the metal fiber used.

As an example of the form of the composite rope, around a four-punch or eight-punch core of polybenzazole fiber,
There is a method of combining a 6-strand or 8-strand metal wire rope into a seal type, a method of using a polybenzobisoxazole fiber rope for the outer wire core, etc. It is preferable to use the form.

[0008] The polybenzazole fiber of the present invention refers to a fiber made of polybenzoxazole or polybenzthiazole, or a random or block copolymer thereof. The tensile strength is 4.0 GPa or more, preferably 4.1 GPa or more, and the initial tensile modulus is 140 GPa or more, preferably 150 GPa or more.

A third component may be provided in the intermediate layer between the central polybenzazole fiber and the outer metal fiber, for example, for preventing corrosion of ordinary grease or metal from acid rain. It is also possible to use a spun yarn or the like for soaking oil or a surface protective agent in cancer. Alternatively, it can be used for impregnating and coating a resin around the core polybenzazole fiber bundle, or by winding a resin tape in a spiral to improve the contact with the outer metal fiber wire rope. is there.

The composite rope of the present invention is a metal wire rope
Greater quantification is possible compared to. That is, polybenzobis
The density of the oxazole fiber is 1.6 g / cm^ThreeIs less than
7.7 g / cm amorphous in the case of metal fiber
^Three7.8 g / cm for piano wire ^Three, 7.8g / with piano wire
cm^Three7.98 g / cm with fine stainless wire^ThreeAnd the wire diameter
Polybenzbisoxazole fiber even after subtracting the effect of
Weight is less than one-third of the volume used. Special
In addition, the core rope and outer layer of polybenzobisoxazole fiber
By properly adjusting the weight ratio of the rope to be driven into
Design a rope with the desired linear density and outer diameter according to the application.
Can be. The wire diameter, material and method of the wire used
The amount of the jack can be freely configured according to the above weight design and application.
However, from the viewpoint of weight reduction, wire rope
40% or more of the occupied area must be polybenzazole fiber
And more preferably 50% or more of polybenzazo.
Fiber.

As an excellent feature of the present invention, the heat resistance of the polybenzbisoxazole fiber is as high as 60 ° C., and the wire portion constituting the outer layer is hardly damaged by welding, brazing or the like. In addition, the splicing of the polybenzazole fiber in the inner layer can also have a sufficient bonding strength. The rope of the present invention is extremely excellent in workability.

Furthermore, the composite rope of the present invention has an excellent property of having a higher shock absorbing ability than a metal wire rope. This is because organic fibers have a relatively coarse structure in which the fiber structure itself is a bundle of microfibrils of several tens of angstroms, whereas high-strength metal fibers have a metal structure even though they have an ultrafine structure. This is considered to be because there is little waste in heat and stress propagation. Such a feature further enhances the safety of the structure in the event of an impact from an earthquake or a flying object.

[0013]

EXAMPLES The method for producing a rope according to the present invention will now be described in detail with reference to examples. According to JIS-
L-1013 (1984). The strength and elongation characteristics of the rope were measured according to JIS-G-3525 (1988).

Example 1 and Comparative Example 1 1500 denier strength 4.1 GPa Elastic modulus 205 GPa
A 4 mm rope having a diameter of 8 mm was made from the polybenzbisoxazole fiber, and a 14 mm seal type rope was produced by combining with 19 lines of 4 mm type B plating and 8 wire strands. As a comparative example, a four-stroke rope having a diameter of 8 mm was made of a polyparaphenylene terephthalamide fiber (manufactured by Dupont Toray Kevlar: Kevlar 49) having a 1500 denier strength of 2.7 GPa and an elastic modulus of 131 GPa. A shaped rope was made. Table 1 shows the breaking strength, the intermediate elongation, and the rope linear density of both, together with those of a general wire rope (vinylon core). It can be seen that the rope of the present invention has extremely high dimensional stability and extremely high strength. The rope of Example 1 is 14m
It has the same strength as an 18 mm wire despite its m.

[0015]

[Table 1]

Example 2 1500 denier strength 4.1 GPa Elastic modulus 155 GPa
Of polybenzbisoxazole fiber with a diameter of 22 mm
A 3 mm wire consisting of seven plated hard steel wires was added to the core rope around which a striated knitted rope was made, and a 150 μm thick polyethylene terephthalate film was wound therearound. Form 2 like
An 8 mm rope was made. The breaking strength of the core rope is 64
In tons, the linear density of the composite rope was 1.97 kg / m. For a normal 28mm wire rope, about 3
The weight was reduced by 0%. Further, the cover of the polyester tape has no damage to the core rope at the time of steel making, and has little moisture permeation at the time of rainfall, so that the characteristics of the lightweight material can be maintained.

[0017]

According to the present invention, it is possible to provide a high-performance composite material rope which is greatly reduced in weight and has excellent dimensional stability. Moreover, the heat resistance of polybenzazole fiber is 600
° C, the damage of the wire constituting the outer layer during welding, brazing, etc. is extremely small, and the polybenzazole fiber of the inner layer has sufficient joining strength to be spliced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a composite rope showing an example of the present invention.

FIG. 2 is a cross-sectional view of a composite rope showing an example of the present invention.

FIG. 3 is a sectional view of a composite rope according to a third embodiment of the present invention.

[Explanation of symbols]

 1: metal fiber 2: polybenzazole fiber 3: polyester film

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D07B 1/00-9/00 D01F 6/74 D02G 1/00-3/48 D02J 1/00-13/00

Claims (1)

(57) [Claims] (1) a tensile strength of at least 4.0 GPa or more;
A rope comprising a polybenzbisoxazole fiber having an initial tensile modulus of at least 140 GPa or more and a metal wire layer provided on the outside thereof.