JP2002264884A - Floating mooring fiber rope - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a floating body mooring fiber rope capable of accurately and reliably mooring a floating body such as a one-point mooring type middle-rise floating fishing reef or a water surface mooring type ocean observation buoy at a predetermined position. A fiber rope for mooring a floating body under tension, wherein the fiber rope applies a load substantially equal to a load applied during use or a load equal to or more than １ ／ of a load applied during use. The length is set to the measured length, and preferably has a measured length shorter than the measured length by a required length in accordance with the repeated load elongation characteristics of the fiber rope.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fiber rope for mooring a floating body.

[0002]

2. Description of the Related Art Textile ropes are widely used in a wide range of fields such as fishing and ships, but when the floating body is subjected to tension of 1000 to 7 under tension.
When mooring from the bottom of the water at a depth of about 000 m, for example, in a structure such as a one-point mooring type middle-rise floating reef, a water surface mooring type ocean observation buoy, or a caisson performed by applying an initial tension, the mooring rope is set to a predetermined length. It is important to install them.

As a method of setting such a rope length,
Conventionally, a method prescribed by the JIS standard or a method similar thereto, that is, a load that is easy to load and a relatively low load (approximately the initial load, specifically, about 100 to 200 kg) is applied, or the length is measured without a load. Then, calibrate by applying the load elongation curve by one load, or measure the weight per unit length of the rope loaded with the working load in advance, and calibrate the length of the unloaded rope by weight I was looking for.

[0004]

However, in such a conventional fiber rope, since the length is measured under conditions different from the actual use conditions, the length accuracy does not match the actual situation. However, the floating body cannot be maintained at the predetermined water depth, and the floating body often floats on the sea surface or, on the contrary, sinks at a deeper water depth than the set depth. Further, in the case of a floating body moored on the water surface, the floating body may be submerged in water or may not be able to maintain a tension mooring state and may be in a slack state. For this reason, it is often necessary to perform the re-stretching work, and in that case, setting the length requires time and effort, resulting in a large cost.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to place a floating body such as a single-point mooring type middle floating fishing reef or a water surface mooring type ocean observation buoy at a predetermined position. An object of the present invention is to provide a floating rope mooring fiber rope which can be accurately and reliably moored.

[0006]

According to the present invention, there is provided a fiber rope for mooring a floating body under tension, wherein the fiber rope has a load substantially equivalent to a load applied during use. Alternatively, it is characterized in that the length is set to a length measured while applying a load of 1/3 or more of a load applied during use.

The present invention also relates to a fiber rope for mooring a floating body under tension, wherein the fiber rope has a load substantially equivalent to a load applied during use or １ ／ or more of a load applied during use. The length of the fiber rope is measured while applying a load, and the measured length is shorter than the measured length according to the repeated load elongation characteristics of the fiber rope.

Preferably, the elongation d1 at the time of the final load application corresponding to the load at the time of use, and the elongation d at the time of the first load application corresponding to the load applied to the rope under the applied tension measurement.
It is measured short by a change d3 (d2-d1) of the elongation percentage from 2.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an embodiment of a fiber rope for mooring a floating body according to the present invention, and FIG. 1 shows a used state. (A) shows a case where a floating body is moored above the water surface, and (b) shows an example where a floating body (for example, a floating fishing reef) is tensionally moored below the water surface. In FIG. The rope has an upper end connected to the floating body 2 and a lower end connected to the anchor 3 at the bottom of the water. Figure 1
In (b), the fiber rope 1 of the present invention is an upper rope 1
a and the lower rope 1b are connected, and the floating body 2 is connected to the upper rope 1a and is held at a position at a predetermined distance 1 from the water surface SF.

The structure and fiber material of the fiber rope 1 of the present invention are not limited and are optional. FIG. 2 shows a structural example,
(A) is three strikes, (b) is eight strikes, (c) is 12 strikes, (d) is a double braid, and (e) is a rope whose outer periphery is covered with a resin 10. In addition, strand-coated ropes,
A wire armored rope or the like is selectively used. In addition, as the fiber material, a combination of one or more of general-purpose synthetic fibers represented by nylon, tetron, polypropylene, polyethylene, polyester, and the like, and high-performance fibers represented by aramid, polyarylate, ultra-high-density polyethylene, etc. One.

[0011] The fiber rope 1 of the present invention has a length not determined by an initial load (a load at which the rope is stretched straight without stretching) or a mass, but at least 1/1 of a load applied to the rope during use. The length L is measured in a state where a load equivalent to about 3 is applied, and the length L is corrected for the structural elongation under the working load. The lower limit of the applied load is 1
The reason why the ratio is set to / 3 is that the length accuracy is deteriorated in the length measurement under the applied load of less than this, and the variation when actually used is increased. Specifically, it is about 1 tonf or more.

FIGS. 3 to 5 schematically show a state until the fiber rope 1 of the present invention is obtained. First, a fiber rope as manufactured (hereinafter referred to as an elementary rope) without a load is referred to as a nominal thickness. A sample 30 times or more in length was cut out, and as shown in FIG.
Get. The sample rope 10 is hung on a tester having supports 4 and 4 ′, and the support 4 ′ is pulled with a hydraulic ram or the like,
The load is repeatedly applied and the load elongation is measured.

The maximum load of the repetitive load to be applied is set to a value larger than the load applied to the rope when the fiber rope 1 of the present invention is used, that is, the mooring tension (hereinafter referred to as load during use) TM, and the repetition is repeated at least three times or more, preferably 5 times or more. ~ 7
Times. The sample rope 10 is provided with marks A and B at a central portion at intervals of, for example, 30 or 50 cm, and continuously measures the elongation between the reference points A and B. The working load TM of the mooring rope is calculated at the time of construction design. The in-use load TM is usually calculated using the buoyancy N of the floating body 2 and the force F due to the tide, the shape of the floating body, the rope shape, the row length, and the tide flow velocity as parameters. The used load TM is the buoyancy N and the force F due to the tide. (= Floating body drag Fg and rope drag Fr).

FIG. 4 schematically shows a load elongation curve obtained by the repeated load application. Since the in-use load TM is known as described above, it corresponds to the elongation d1 at the time of the final round load corresponding to the in-use load TM and the load TM1 at the time of a load tension measurement on the elemental rope described later. Of the elongation percentage d between the elongation percentages d2 when the first load is applied
3 (d2-d1) is determined from the load elongation curve.

On the other hand, while applying the same load as the in-use load TM or a load of at least 1/3 of the in-use load TM on the elementary rope 1 ", the length is measured in this loaded state.
FIG. 5 shows a case where the operation is performed offline, and FIG.
(B) shows a state where the operation is performed in-line.

In the case of off-line operation, the raw rope 1 "is wound around a sheave 5 provided with a feed-out restricting mechanism, and the sheave 5 is fixed to the fixing means 6 by the connecting means. It is wound around a sheave 5 'with a feeding restriction mechanism, and two measuring marks C and D are provided on a rope portion between the sheaves 5 and 5'. In this state, the sheave 6 'is hydraulically operated. A load substantially equal to or equal to the load TM during use or a load of at least 1/3 of the load TM during use is applied by a load applying means (not shown) to measure the scale markings C and D, and then unload.

The sheave sheave 5 with the feed-out restricting mechanism is released and the rope is fed out, and two measuring marks C and D are again applied to the rope portion between the sheaves 5 and 5 '. In this state, the operation of applying the same load as the in-use load TM or at least one-third of the in-use load TM to the sheave 5 ′ by the load applying means and measuring the number of times is repeated as necessary.

In the case of performing in-line, FIG.
As shown in (b), the elementary rope 1 "is guided through the upstream double capstan 7, the intermediate capstan 7 ', and the downstream double capstan 7", and the rotational speed of the downstream double capstan 7 "is changed to the upstream double capstan. 7 by applying a load (tension) by rotating at a speed higher than that of 7 and measuring by any measuring means 9 between the exit side of the intermediate capstan 7 'and the entrance of the downstream double capstan 7 ". Perform In this example, a measuring sheave is used to measure the number of revolutions. The cutting is performed by the signal from the measuring means 9 downstream from the downstream double capstan 7 "after the measuring. This in-line method is efficient, the equipment is simple, and is incorporated in the terminal area of the rope manufacturing line. This is advantageous in that it can be performed.

In the measurement, the correction is performed based on the change d3 in the elongation rate described above. That is, instead of simply measuring while using the in-use load TM, the length of the rope is measured to be shorter in accordance with the value of d3 when the load is measured. L 'in FIG. 7 (a) is a measured fiber rope 1' under the load condition equal to or at least 1/3 of the used load TM. The fiber rope 1 of the present invention is cut as shown in FIG. In the case of the in-line system, d3 is stored in the measuring means 9 in advance, and an operation signal is sent from the measuring means 9 to a cutting device (not shown) when the correction length by d3 is reached. FIG. 7B
Of the present invention can be obtained.

The present invention is applicable not only to the case where the entire length is one rope, but also to the case where a plurality of ropes 1a and 1a are used as shown in FIG.
This is also applied when b is connected. In this case, the above-described repeated load elongation measurement, load application / correction measurement is performed for each rope. The fiber ropes 1, 1a, 1b of the present invention thus obtained are connected at a site or the like, connected to the anchor and the floating body 2, and put into a predetermined place.

The fiber rope of the present invention can be applied to either one-point mooring or multi-point mooring.
Including any floating on the water surface. In the present invention, the tension load and the measurement may be performed in-line, and the measurement may be performed separately using the apparatus shown in FIG.

Next, a specific example will be described. Floating body 20m deep
A fiber rope with one tension mooring line installed on the seabed at a depth of 1580 m was prepared for the middle reefs to be maintained at a moderate level. The load during use applied to the rope in this construction is 3000k
gf was calculated. The fiber rope is made of vinyl chloride coated tetron rope (8 hits, nominal diameter 36m)
m), a polypropylene rope (12 hits, nominal diameter 48 mm) was used for the lower rope.

A sample having an effective length of 4 m was prepared from each of the upper rope and the lower rope, and a load elongation curve was obtained by repeatedly applying a load of 5,000 kgf five times using a testing machine. From these load elongation curves, the structural elongation in the working load range was determined. Product fiber rope is in-line load load: 1500kg
It was decided to measure the tension with f. Load when using rope TM
Is 3000 kgf, the lower rope has an elongation d1 at the 3000 kgf point five times after the elongation d2 at the 1500 kgf point at the first time of the load elongation curve.
The change d3 in the elongation rate up to ま で was detected. As a result, d1
Was 9.8%, d2 was 7.2%, and d3 was 2.6%. For the upper rope, d1 is 5.5%, d
2 was 3.5% and d3 was 2.0%.

The tension gauge is used as a correction value with the elongation change d3 as a correction value.
While applying a tension of gf, the length was measured to be shorter by 2.0% to obtain a 650 m rope. With respect to the lower rope, the length was measured to be 3.2% shorter by applying a tension of 1500 kgf, and a rope of 847 m was obtained. The obtained ropes were tied together, connected to an anchor and a floating body, and put into a predetermined water depth. As a result, the floating body is always
Tension was moored within 25m.

For comparison, a rope was weighed with 100 kg, measured for length, and calibrated by applying a load elongation curve caused by a single load, and an upper rope having a length of 670 m and a length of 85 mm were measured.
A 1 m lower rope was obtained. The same floating body was moored to this rope. As a result, the floating body will rise to the surface of the water after installation. Reinstallation was required. From this result, it is understood that the rope of the present invention has excellent performance of accurately and reliably mooring the floating body at a predetermined position.

[0026]

According to the first aspect of the present invention described above, the fiber rope for mooring the floating body under tension is equivalent to the load applied during use or equal to or more than 1/3 of the load during use. Because the length is set to the measured length while adding the length, even if the structural elongation of the fiber rope occurs in the installed state, the floating body such as the one-point mooring type middle floating fishing reef, the water surface mooring type ocean observation buoy, etc. An excellent effect that the mooring can be accurately performed at the position can be obtained.

According to the second aspect, the length is measured while applying a load equal to the load applied during use or at least one-third of the load during use, and furthermore, according to the repetitive load elongation characteristics of the fiber rope. Since the measuring length is shorter than the required length, the length accuracy is further improved, and an excellent effect that the floating body can be accurately moored at a predetermined position can be obtained. According to the third aspect, the elongation rate d1 at the time of the final load load corresponding to the load TM during use, the elongation rate d2 at the time of the first load load corresponding to the load F1 at the time of the load tension measurement on the rope, and Change in elongation d3
Therefore, an excellent effect that the length can be made accurate according to the use condition can be obtained.

[Brief description of the drawings]

1 (a) and 1 (b) are explanatory views showing an example of use of a fiber rope for mooring a floating body according to the present invention.

FIGS. 2A to 2E are explanatory views showing examples of the structure of a fiber rope for mooring a floating body according to the present invention.

FIG. 3 is a schematic explanatory view of a repeated load elongation characteristic step in the present invention.

FIG. 4 is a schematic diagram of a load elongation curve in a repeated load elongation characteristic step.

FIG. 5 is an explanatory view schematically showing an example of a load measuring step in the present invention.

FIG. 6 (a) is a side view schematically showing an example of a load measuring step in the present invention, and FIG. 6 (b) is a plan view thereof.

FIG. 7A is an explanatory diagram showing a rope at a stage of measuring a load, and FIG. 7B is an explanatory diagram of the rope after correction.

[Explanation of symbols]

 1 Fiber rope of the present invention 1a Upper rope 1b Lower rope 2 Floating body TM Load when used

Claims (3)

[Claims] 1. A fiber rope for mooring a floating body under tension, wherein the fiber rope applies a load substantially equal to a load applied during use or a load of 1/3 or more of a load applied during use. A fiber rope for mooring a floating body, characterized in that the length is set to a length measured while measuring. 2. A fiber rope for mooring a floating body under tension, wherein the fiber rope applies a load substantially equal to a load applied during use or a load equal to or more than の of a load applied during use. A fiber rope for mooring a floating body, characterized in that the length is measured while measuring the length of the fiber rope, and the length is measured to be shorter than a required length by a required length in accordance with the repeated load elongation characteristics of the fiber rope. 3. An elongation percentage between an elongation percentage d1 at the time of the final load application corresponding to a load during use and an elongation percentage d2 at the time of the first load application corresponding to the load applied to the rope under a load tension meter. The fiber rope for mooring a floating body according to claim 2, wherein the change d3 (d2-d1) is measured short.