JP3221886U - Fiber rope - Google Patents

Abstract

An object of the present invention is to provide a high strength and lightweight fiber rope which is rich in dimensional stability. In addition, the present invention provides a fiber rope which is excellent in weather resistance, less in creep deformation, hardly causes permanent deformation, sufficiently withstands long-term use, and is particularly suitable for mooring alternative marine storage vessels. It is a fiber rope of double structure of outer layer rope 3 which covers the outside, and inner layer rope 2 has high strength and high elastic modulus, and a plurality of strands obtained using fibers excellent in dimensional stability The outer layer rope 3 is formed by twisting a plurality of strands obtained by using fibers having high strength, high weather resistance, light weight and low creepability. [Effect] High strength with equivalent dimensional stability compared to metal mooring line, yet strong against repeated load, much lighter, better weather resistance, less creep deformation, permanent deformation It is less likely to occur and is ideal for long-term use, particularly suitable for mooring alternative marine storage vessels. [Selected figure] Figure 1

Description

  The present invention relates to an inner and outer double-layered fiber rope mainly used for vessels, particularly mooring of alternative water storage vessels and other large cargo vessels, towing of tugboats, and also for marine civil engineering work.

  For example, in the case of cargo ships, short-term moorings such as one or two days or at most a week used in the general transportation mode, for example, from the loading area or port to the next port. Unlike in one place, there is now a mode of use in which the ropes used continue to be anchored without being replaced over a considerable period of time, for example 10 or 15 years.

  That is, conventionally, natural energy resources such as oil, natural gas, and other coal are transported to a port by a large tanker, transferred from here to a permanent storage facility on the ground, and temporarily stored.

By the way, in recent years, instead of the construction of the above-ground storage facility, large vessels such as used cargo ships are floated on the sea or river near the wharf and moored instead of the construction of the above-mentioned storage facility because of the demand for cost reduction and easy installation. New attempts are being made to replace storage facilities. In addition, from this alternative water storage vessel, a means of transferring directly to land on land via a pipeline, a belt conveyor, etc., such as a tank car such as a freight car or an automobile, is being explored. Therefore, the rope used for mooring of this type of alternative on-water storage vessel is required to withstand long-term use without replacement and be maintenance-free. In addition, for example, a large storage tank, and even a power generation facility has been equipped to replace the power plant, and the spread of applications has been explored. It goes without saying that the same severe conditions as described above are required for the fiber ropes for mooring alternative vessels also in these cases.
The concept of such alternative water storage vessels is considered to increase demand in the future.
In the present invention, the above alternative vessels will be comprehensively expressed in the following simply as alternative underwater storage vessels for the sake of convenience.

  In such a long-term use mode, conventionally, wire ropes and metal chains are generally considered, and are also used practically for temporary mooring of large vessels.

  However, if it is a metal, it can not withstand long-term use without maintenance due to corrosion. In addition, compared to fiber ropes, even if they have the same diameter, they are much heavier and difficult to handle.

  In view of such a current situation, the present inventors focused attention on fiber ropes that replace conventional wire ropes and metal chains. If it is a fiber rope, the metal defect of corroding at an early stage is eliminated.

  Therefore, as compared to ropes made by twisting ordinary fibers alone, we will use much higher values in all functions and pay attention to double ropes with higher production efficiency than those with triple weave and more. We repeated examination in direction. Conventionally, fiber ropes of this type of double structure adopt general fibers (mostly long filament yarn of nylon) for both inner and outer layer ropes, make inner layer ropes be nylon, outer layer ropes be polyester fibers, etc. Devices such as changing the combination of types or mixing high-performance fibers in part are added (see Patent Documents 1 to 3).

Unexamined-Japanese-Patent No. 07-208061 gazette JP 2000-178888 A Utility model registration No. 3152400

By the way, the fiber rope intended by the present invention is required to have various high performances from the unique environment used as described above, unlike the conventional general fiber rope.
That is, in the case of dimensional stability, that is, in the case of long-term mooring etc., it is always better for the rope to extend or less, and high strength, that is, to keep receiving a constant load over a long period, Resistance to light, being lightweight, and as a further requirement, it is necessary to have conditions such as weather resistance and resistance to seawater, that there is little creep deformation, and that permanent deformation does not easily occur. I understand.

  From this point of view, considering the structure and configuration of the conventional fiber ropes, the structures and configurations disclosed in Patent Documents 1 to 3 are different from the structures and configurations intended by the present inventors, and are not necessarily desired. It was not.

  Therefore, based on the above new findings, the present inventors continued to consider the properties of the rope material and referred to as so-called super fibers, representative aramid fibers, HMPE (ultrahigh molecular weight polyethylene) fibers, Furthermore, three types of LPC (high strength polyarylate) fibers were compared to find out a high performance fiber rope. As a result, it is possible to obtain a new fiber rope which is low in expansion and contraction and high in dimensional stability, high in resistance to repeated load, high in strength, light in weight, additionally resistant to weathering, small in creep deformation and hard to cause permanent deformation. I proposed it here because I was able to

  Therefore, an object of the present invention is to provide a high strength and lightweight fiber rope which is dimensionally stable. Another object of the present invention is to provide a fiber rope which is excellent in weather resistance, less in creep deformation and less likely to cause permanent deformation, and in particular, can sufficiently withstand long-term use applicable to the mooring of the above-mentioned alternative water storage vessel. .

  In order to achieve the above object, the fiber rope according to claim 1 of the present invention is a double-layered fiber rope of an inner layer rope and an outer layer rope covering the outer side, wherein the inner layer rope has high strength and high strength. A plurality of strands obtained by using fibers having an elastic modulus and excellent dimensional stability are twisted together, and the outer layer rope is made of fibers having high strength, high weather resistance, light weight and low creepability. The obtained plurality of strands are twisted and configured.

  In the fiber rope according to the present invention, it is preferable that LCP (high strength polyarylate) fibers or fibers in which general-purpose fibers having durability are mixed with the LCP (high strength polyarylate) fibers are used as the inner layer rope strands.

  In the fiber rope according to the present invention, it is desirable to use, as the outer layer rope, a fiber in which HMPE (ultrahigh molecular weight polyethylene) fibers or general-purpose fibers having durability in the HMPE (ultrahigh molecular weight polyethylene) fibers are mixed.

  In the fiber rope according to the present invention, it is desirable that the outer layer rope be constructed of a braided structure in which a plurality of strands are combined without a gap.

In the fiber rope according to the present invention, the durable general-purpose fiber is preferably polyester, nylon or polyvinyl alcohol.

  By providing the above-mentioned configuration, the present invention is equivalent to the dimensional stability and high in strength as compared with the conventional metal ropes and chains, yet is much lighter, and is excellent in weatherability, and creep. It is possible to construct a fiber rope that is sufficiently resistant to long-term use where deformation is small and permanent deformation is unlikely to occur.

Since the obtained fiber rope is composed of high strength and high elastic modulus fibers for both the inner and outer layer ropes, the rope stretches little or less and the resistance to repeated load is strong, so it is almost constant over a long period of time Even if the load continues, the ropes maintain their desired strength and size so that they can achieve their desired functions such as stable mooring for a long period of time. Also, unlike the wire ropes and chains, etc., because of their light weight, the strength is, of course, sufficiently higher than these, making them ideal for long-term use.
Furthermore, since the inner layer rope is made of a fiber excellent in dimensional stability, the stretch of the rope is small even when used over a long period of time, and the desired function such as stable mooring can be performed better. The
In addition, the outer layer ropes use high-strength, high-weatherability and light-weight, low-creep fibers in addition to significantly reducing the weight of the ropes, and of course the threat of wind and rain, seawater and ultraviolet rays. Etc., and the strength can be maintained well, moreover, the inner layer rope can be well protected to prevent its deterioration and contribute well to the maintenance of the strength, so that the function of the inner layer rope can be worked better.

  In particular, it can be used for a long time without replacing an alternative water storage vessel in which a large vessel such as a cargo ship floats on the sea or river near the quay instead of permanent storage facilities on land, for example, It is suitable as a fiber rope used in a new attempt of mooring at.

  In the above configuration, either LCP (high strength polyarylate) fibers or fibers in which general-purpose fibers having durability with the LCP (high strength polyarylate) fibers are used for the inner layer rope strands, and the outer layer rope Since the strands of HPMPE (ultra-high molecular weight polyethylene) fibers or fibers in which general-purpose fibers having a durability to the HMPE (ultra-high molecular weight polyethylene) fibers are mixed are used, they have high dimensional stability and high strength. It is possible to provide a more ideal fiber rope which is light in weight, excellent in weather resistance, less in creep deformation, and less likely to cause permanent deformation. Furthermore, in the case of mixing durable general purpose fibers, it is possible to expand the application range of the fiber rope, and in addition, it is advantageous in cost.

  Further, in the fiber rope according to the present invention, since the outer layer rope is formed of a braided structure in which a plurality of strands are combined without a gap, each strand constituting the outer layer rope is combined in a close contact state without a gap The possibility that the strands of the inner layer rope will be directly exposed to sunlight can be eliminated, and the strength reduction due to the aged deterioration of the inner layer rope can be well suppressed, and the intended purpose can be achieved well.

  Furthermore, since the durable general-purpose fiber is any of polyester, nylon, and polyvinyl alcohol, even if HMPE fiber and LCP fiber alone are used, the function declines so much as to cut the intended purpose extremely Also, it can be provided inexpensively without causing

The Example of the fiber rope concerning this invention is shown, and it is explanatory drawing of the principal part.

Hereinafter, embodiments of the present invention will be described in detail based on the attached drawings.
FIG. 1 is an explanatory view of an essential part of a fiber rope according to the present invention. The fiber rope 1 has a double structure of an inner layer rope 2 as a core material of the fiber rope 1 and an outer layer rope 3 surrounding the outer side of the inner layer rope 2. Moreover, the outer layer rope 3 is comprised from the braided structure which combined the several strand without gap.

  In this embodiment, the inner layer rope 2 adopts a fiber which is particularly high in strength and high in elastic modulus and excellent in dimensional stability. In addition, the outer layer ropes adopted fibers with high strength, high weather resistance, light weight and low creep.

  As a representative example of a fiber having a high strength and a high modulus of elasticity adopted for the inner layer rope 2 and having excellent dimensional stability, there is LCP (high strength polyarylate) fiber. Further, HMPE (ultra high molecular weight polyethylene) fiber is a typical example of the high strength, high weather resistance, light weight and low creep property fiber adopted for the outer layer rope 3.

The present inventors, prior to obtaining the fiber rope according to the present invention, in view of the functional properties of the fiber rope to be obtained, ie strength, elongation, weight, weatherability, creepability, etc., aramid fiber, HMPE Three types of fibers and also LPC fibers were selected and compared.
And
Strength: HMPE fiber> LCP fiber> Aramid fiber Stretch: LPC fiber> HMPE fiber Weight: HMPE fiber> LCP fiber> Aramid fiber Weather resistance: HMPE fiber> LCP fiber> Aramid fiber Creep: HMPE fiber> Aramid The result of fiber> LCP fiber was obtained.

  That is, the strength is the highest in HMPE fibers and the highest in strength, and the weakest in aramid fibers. In terms of elongation, LCP fiber is the least stretchable and has excellent dimensional stability, and HMPE fiber is the most extensible. HMPE fiber is the lightest and lightest weight, and aramid fiber is the heaviest. In weatherability, HMPE fiber shows high value, and aramid fiber shows lowest value. Creep is lowest for HMPE fibers and highest for LCP fibers.

  From the above results, it is generally judged that the aramid fibers tend to be somewhat inferior to any of the functional characteristics, so two types of HMPE fibers and LCP fibers were adopted. It was then chosen to make the inner layer rope with LCP fibers and the outer layer rope with HMPE fibers, in view of their respective functional properties. Furthermore, in order to further improve the function, it was tried to adopt a type with lower creepability for HMPE fibers and a type with higher strength for LCP fibers.

  In this way, by properly meshing the properties of the fibers, it is possible to obtain fiber ropes that can achieve their intended purpose quite differently from those composed of conventional wire ropes and chains, and also general purpose fibers. Came to be able to

  Also, in view of the environment and conditions to be used, and also in terms of cost etc., it is also possible that the HMPE fiber and the LCP fiber be mixed with durable general purpose fibers. As examples of durable general purpose fibers, polyester, nylon and polyvinyl alcohol fibers are desirable.

  The term “mixture” includes both the case where yarns of HMPE fibers or LCP fibers and yarns of general-purpose fibers are used in combination, in addition to the case where two kinds of fibers are mixed in one yarn itself.

  20 long fibers of LCP fibers of 1500 denier are twisted to form a core yarn, 30 obtained core yarns are twisted to form a strand, and 12 strands obtained are further twisted to obtain a nominal diameter. An inner layer rope 2 of 38 mm was formed. On the other hand, four long fibers of HMPE fibers of 1,600 denier are twisted to form a core yarn, four obtained core yarns are twisted to form a strand, and the obtained strands are aligned in a set of three. The outer layer rope 3 is formed by forming eight pairs, making the inner four pairs right-twisted and the other four pairs left-twisted to form a close-packed braided structure with no gaps. .

  As the expected standard value of the fiber rope to be obtained, the nominal diameter is the diameter of the wire rope of the thickness that is most conveniently used conventionally, that is, 44 mm, and the strength is intended to surpass the wire rope From 1380kN It was decided.

The strength, weight and elongation of the obtained fiber rope were measured.
In the test of elongation, the elongation to 1000 kN was measured by setting 69 kN which is 5% of expected value strength 1380 kN as zero.
As a result, the nominal value of the nominal diameter was 50 mm, the strength was 1505 kN, the weight was 1.67 kg / m, and the elongation was 3.40%.

  These values are also widely used as moorings, compared with a weight ring of 8.5 kg / m in the Warrington seal type, IWRC 6 x WS (36), with a nominal diameter of 44 mm. It showed a value of approximately one-fifth at 1.67 kg. In addition, the strength was 1505 kN against 1380 kN, which was 15% more than the strength of the wire rope sufficiently. Furthermore, the growth was 3.40%, which was as expected.

  From this test result, by using the inner layer rope 2 as LCP fiber and the outer layer rope as HMPE fiber, the dimensional stability is high, high strength and light weight, excellent in weather resistance, less creep deformation, less likely to cause permanent deformation I was able to successfully achieve the intended purpose of getting a fiber rope.

  In particular, it can be used for a long time without replacing an alternative water storage vessel in which a large ship such as a cargo ship floats on the sea or river near the quay instead of permanent storage facilities on land, and can be maintained free of charge. It is suitable as a fiber rope used in a new attempt of mooring.

  Also, when any of polyester, nylon and polyvinyl alcohol is mixed with LCP fiber and HMPE fiber as a general purpose fiber having durability, the mixing ratio as compared with the case where LCP fiber and HMPE fiber are used alone. Depending on the situation, there is little possibility that the function will be degraded to the extent that the intended purpose is extremely reduced, and especially because the range of application can be expanded and there is an advantage that it can be provided inexpensively. It does not deny the mixing of certain general purpose fibers.

  Furthermore, the rope diameter is too thin, which is likely to cause problems in strength, and it is difficult to achieve the initial function. On the contrary, if it is too thick, the weight increases and handling becomes inconvenient. According to the rule of thumb, a range of 30 to 60 mm is appropriate.

  The fiber ropes according to the present invention are aquaculture ropes and mooring ropes for mooring floating floating structures used for exploration of marine resources, etc., as well as alternative water storage vessels, as needed. The present invention is also suitably applied as a marine fishing rope such as fixed or bottom, or as a general land rope.

1 ... fiber rope 2 ... inner layer rope 3 ... outer layer rope

Claims (5)

  An inner-layer rope and an outer-layer rope having a double structure comprising an outer-layer rope, wherein the inner-layer rope has a high strength and a high elastic modulus and a plurality of strands obtained using fibers excellent in dimensional stability And the outer layer rope is a fiber characterized in that a plurality of strands obtained by using fibers of high strength, high weather resistance, light weight and low creepability are twisted. rope.   The fiber rope according to claim 1, wherein LCP (high strength polyarylate) fibers or fibers in which general-purpose fibers having durability are mixed with LCP (high strength polyarylate) fibers are used as the inner layer rope strands.   The fiber rope according to claim 2, wherein the outer layer rope is made of HMPE (ultra high molecular weight polyethylene) fibers or fibers in which general-purpose fibers having durability are mixed with said HMPE (ultra high molecular weight polyethylene) fibers.   The fiber rope according to any one of claims 1 or 3, wherein the outer layer rope comprises a braid structure in which a plurality of strands are combined without a gap.   The fiber rope according to any one of claims 1 to 3, wherein the durable general-purpose fiber is any of polyester, nylon and polyvinyl alcohol.

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