JP6825796B2 - rope - Google Patents

Description

The present invention relates to a strand and a rope using the strand, and more particularly to a rope for fixing a marine rig for mooring a ship or mooring a marine structure from the seabed.

Generally, in a rope, a plurality of yarns are twisted to form a yarn, and a plurality of the yarns are further twisted to form a strand, and a plurality of the strands are further twisted or combined to form a rope.

A combination of three strands is called a three-strand rope or a three-strand rope, and a combination of eight strands is called a cross rope or a three-strand rope. In addition, four-strand ropes made by twisting four strands and ropes made by combining twelve or sixteen ropes are also used.

As a strand in these ropes, as seen in Japanese Patent Application Laid-Open No. 2014-111851, a core material in which a plurality of fibers are aligned is inserted into a tubular woven fabric in which warp threads and weft threads are woven into a tubular shape. What was done is known.

Japanese Unexamined Patent Publication No. 2014-111851

However, in the above-mentioned three-twisted rope and cross rope, in order to form a yarn, the raw yarn must be twisted repeatedly twice and three times, and the yarn is further twisted into a strand, and further, the said A rope is formed by twisting or combining a plurality of strands.

Therefore, in the final strand or rope, the original individual yarns are repeatedly twisted, so that the length of the yarns becomes longer than the length of the rope, and the ropes stretch when tension is applied. The rate became high, and the tensile strength inherent in the fiber could not be fully utilized.

Further, as the thickness of the rope increases, the number of yarns constituting the strand increases, the length of the yarn differs between the central portion and the peripheral portion of the strand, and it is difficult to match the tensions of a plurality of yarns. The utilization rate of fiber strength was reduced.

Further, in the strand or rope described in Patent Document 1, since the core material of the strand extends substantially in parallel, a rope having a relatively high utilization rate of strength is obtained, but the core material is tubular. Since the tubular woven fabrics are tied together with woven fabrics, the tubular woven fabrics rub against each other and wear, and the tubular woven fabrics fall apart, making it impossible to maintain the parallelism of the core material and maintaining a high strength utilization rate. I couldn't.

The present invention has been made in view of such circumstances, and in the rope having the structure described in the above-mentioned publication, a rope capable of improving the abrasion resistance of the tubular woven fabric and maintaining a high strength utilization rate can be obtained. The purpose is to do that.

Thus, the present invention relates to a strand composed of a tubular woven fabric in which warp threads and weft threads are woven into a tubular shape, and a core material focused in the tubular woven fabric in parallel with respect to the length direction. A plurality of strands in which all or a part of the warp yarns of the woven fabric are made of synthetic monofilament yarns and the tubular woven fabric is woven by a twill weave structure in which many of the warp yarns are exposed on the surface thereof are twisted or twisted. It is characterized by being a combination.

In the present invention, it is preferable that one-third or more of the warp yarns of the tubular woven fabric is synthetic fiber monofilament yarns.

According to the present invention, in the rope having the above structure, since the monofilament yarn of the synthetic fiber is used as the warp yarn of the tubular woven fabric constituting the strand, when the strands rub against each other, the monofilament yarn abuts and rubs against each other. Since the monofilament yarn is rigid, slippery, and has excellent wear resistance, the tubular woven fabric does not come apart, and the utilization rate of high strength as a rope can be maintained.

Further, when the rope is used as a rope, the rope often rubs against the ground when the rope is handled, but even in this case, the monofilament yarn is rigid and slippery, so that the wear resistance is improved. is there.

Further, as the warp yarn of the tubular woven fabric, a monofilament yarn and a multifilament yarn or a spun yarn of synthetic fibers can be mixed and used, but in that case, one third or more of the warp yarns may be monofilament yarns. preferable.

Since monofilament yarn is more rigid than multifilament yarn and spun yarn, when mixed and used as described above, the monofilament yarn tends to float on the surface of the tubular woven fabric, even if it is 1/3 of the warp yarn. The monofilament yarn is mainly subjected to friction, and the effect of the present invention can be sufficiently maintained.

Further, by weaving the tubular woven fabric with a twill weave structure in which many warp yarns are exposed on the surface thereof, a large number of monofilament yarns are exposed on the surface of the strands, and the effect of the present invention can be sufficiently maintained.

The rope of the present invention is shown, in which (a) is a plan view and (b) is a cross-sectional view. The strand in the rope of this invention is shown, (a) is a central vertical sectional view, and (b) is a horizontal sectional view. Strand wear resistance tester.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 shows the rope 1 of the present invention, in which twelve strands 2 are combined to form a twelve-strike cross rope. The rope 1 may be a cross rope such as eight-strand, or a twisted rope such as three-twisted or four-twisted.

FIG. 1 shows the strand 2 in the present invention, in which a core material 6 extending in the length direction thereof is inserted in parallel in a tubular woven cloth 5 in which a warp thread 3 and a weft thread 4 are woven into a tubular shape. There is. In the example of the drawing, the woven structure of the tubular woven fabric 5 is a 3/1 twill woven structure.

In the present invention, a synthetic fiber monofilament yarn is used for the warp yarn 3 of the tubular woven fabric 5. Polypropylene is suitable as the material of the monofilament yarn, and a fineness of about 1000 to 10000T (decitex) is suitable. In addition to polypropylene, synthetic fibers such as polyethylene, polyester, and nylon can also be used as the monofilament yarn.

Further, as the warp yarn 3 of the tubular woven fabric 5, all may be monofilament yarns of synthetic fibers, but yarns twisted or aligned with multifilament yarns or spun yarns of other synthetic fibers are used. You can also do it. In this case, it is preferable to use the monofilament yarn at 1/3 or more of the warp yarn 3.

[Example]
As an example of the present invention, a warp yarn (total fineness 39840T) is obtained by twisting six yarns obtained by aligning one 3300T polypropylene monofilament yarn and two 1670T polyethylene terephthalate multifilament yarns. 14 yarns are used as 3, and 28 yarns made by twisting two 1670T polyethylene terephthalate multifilament yarns as weft yarns are driven in between 10 cm, and a tubular woven fabric 5 having a diameter of 22 mm with a 3/1 twill weave structure. In the tubular woven fabric 5, 163 yarns obtained by twisting six 1670T polyethylene terephthalate multifilament yarns were aligned and inserted to form a core material 6, and a strand 2 was formed.

[Comparison example]
As a comparative example, three yarns obtained by twisting three 2200T polypropylene multifilament yarns and four 1670T polyethylene terephthalate multifilament yarns are twisted together, and three yarns (total fineness 39840T) are used as warp yarns. In this use, 28 yarns made by twisting two 1670T polyethylene terephthalate multifilament yarns as weft yarns are driven in between 10 cm to weave a tubular woven fabric with a diameter of 22 mm with a 3/1 twill weave structure. In the woven fabric, 163 yarns obtained by twisting six 1670T polyethylene terephthalate multifilament yarns were aligned and inserted to form a core material to form a strand.

In both the above examples and the comparative examples, as the warp yarn of the tubular woven fabric, a yarn obtained by twisting 19800T of polypropylene fiber and 20040T of polyethylene terephthalate fiber to have a total fineness of 39840T is used, and polypropylene is used. The total amount of each yarn used is exactly the same, except that the fibers are monofilaments in the examples and multifilaments in the comparative examples. Further, the structure of the weft and the structure of the core material are exactly the same in both the examples and the comparative examples.

[Test method]
The strands of each of the above examples were subjected to a rope wear tester shown in FIG. 3 to examine their wear resistance. In this wear tester, sandpaper 8 is attached to the surface of the roller 7, the strand 9 is hung on the surface of the roller 7, the roller 7 is rotated in the direction of the arrow, and the strand 9 is reciprocated as shown by the arrow. The number of round trips from 9 until the core material was exposed was measured.

The conditions are as follows.
Load applied to the strand 10kgw
Strand reciprocating stroke 250mm
Strand reciprocating speed 50 times / min Sandpaper grain size # 400
Roller rotation speed 50r.pm

[Test results]
When the above test was performed, in the comparative example, the core material was exposed after the strands were reciprocally worn 2000 times, but in the example, the core material was exposed even when the strands were reciprocated 5000 times. It never happened.

1 Rope 2 Strand 3 Warp 4 Weft 5 Cylindrical fabric 6 Core material

Claims (2)

A tubular woven fabric (5) in which warp threads (3) and weft threads (4) are woven into a tubular shape, and a core material (6) focused in the tubular woven fabric (5) in parallel with the length direction thereof. In the strand (2) composed of the above, all or part of the warp threads (3) of the tubular woven fabric (5) is made of synthetic monofilament threads , and the tubular woven fabric (5) has the warp threads on its surface. A rope characterized by twisting or combining a plurality of strands woven by a twill weave structure in which a large amount of (3) is exposed. The rope according to claim 1, wherein one-third or more of the warp yarns (3) of the tubular woven fabric (5) is synthetic fiber monofilament yarns.

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