JP2024098196A - Method for suspending anchor and suspension system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress rolling of an anchor.

SOLUTION: A method for suspending an anchor for mooring a floating body is provided. This method includes: a step for coupling a suspension rope and a swing-stop rope with more stretching property than the suspension rope to the anchor; and a step for receiving the weight of the anchor in the vertical direction by the suspension rope as well as hanging the anchor from a barge type platform while receiving the weight of the anchor in the horizontal direction by the swing-stop rope.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

This disclosure relates to a method and system for suspending a weight.

Devices that use mooring ropes to moor floating bodies that float in the water are known (see, for example, Patent Documents 1 to 6 below). For example, Patent Document 1 describes a power generation device that includes an anchor attached to the seabed, a float that has blades that rotate with the water current and generates power through the rotation of the blades, and a mooring rope that connects the anchor and the float.

Special Publication No. 2014-534375 JP 2002-266743 A JP 2003-074455 A JP 2011-132943 A JP 2013-227964 A JP 2015-138579 A

When installing the above-mentioned power generation device underwater, the weight (anchor) that moors the float is lowered while suspended from a barge and placed on the bottom of the water. Here, while the weight is suspended underwater, the water current or the swaying of the barge may act on the weight, causing it to sway sideways. If the swaying of the weight becomes too great, it becomes difficult to install the weight at the target position. It is also possible to test run the power generation device while the weight is suspended underwater, rather than being placed on the bottom of the water. In this case as well, if the weight experiences too much swaying underwater, excessive load may be placed on the mooring line connecting the weight to the float, which may cause damage to the mooring line.

Therefore, the purpose of this disclosure is to suppress the lateral shaking of the weight.

In one aspect, a method for suspending a weight for mooring a floating body in water is provided. This method includes the steps of connecting a suspension rope and a vibration-stopping rope having higher elasticity than the suspension rope to the weight, and suspending the weight in water from a barge while the suspension rope bears the vertical load of the weight and the vibration-stopping rope bears the horizontal load of the weight.

In the method according to this aspect, the weight is suspended while the weight's horizontal load is received by the anti-vibration rope, so the tension of the anti-vibration rope can dampen the lateral sway of the weight. If the barge and weight are connected by an anti-vibration rope with high rigidity, the lateral sway of the barge is transmitted to the weight, and the weight is likely to sway laterally. In particular, if the lateral sway periods of the barge and the weight are the same, the sway is amplified and the lateral sway of the weight is likely to increase. In contrast, in the method according to this aspect, the weight's horizontal load is received by an anti-vibration rope with high elasticity, so the lateral sway of the barge is less likely to be transmitted to the weight via the anti-vibration rope. Therefore, the lateral sway of the weight can be suppressed.

In one embodiment, the vibration-stopping rope includes a rigid rope having one end and the other end, and a low-rigidity rope having one end and the other end and having higher elasticity than the rigid rope, and one end of the rigid rope may be connected to the barge, one end of the low-rigidity rope may be connected to the weight, and the other end of the rigid rope may be connected to the other end of the low-rigidity rope. The rigid rope connected to the barge has a relatively high rigidity and is therefore unlikely to be damaged even if it comes into contact with the barge. On the other hand, the low-rigidity rope connected to the weight has a relatively high elasticity and is therefore unlikely to transmit the horizontal swaying of the barge to the weight. Therefore, according to this embodiment, it is possible to suppress damage to the vibration-stopping rope while suppressing lateral swaying of the weight.

In one embodiment, the rigid rope may be a metal wire, and the low-rigidity rope may be a resin rope. By using a metal wire as the rigid rope, damage to the vibration-stopping rope can be suppressed. By using a resin rope as the low-rigidity rope, the lateral sway of the barge is less likely to be transmitted to the counterweight, and the lateral sway of the counterweight can be suppressed.

In one embodiment, the method may include a step of adjusting the length of the anti-vibration rope so that the length is 110% to 130% of the water depth of the sinker. By adjusting the length of the anti-vibration rope to 110% to 130% of the water depth of the sinker, slack is created in the anti-vibration rope, making it difficult for the lateral sway of the barge to be transmitted to the sinker. As a result, the lateral sway of the sinker can be suppressed.

In one aspect, a suspension system is provided that suspends a weight that moors a floating body underwater. This suspension system includes a barge, a suspension rope that connects the weight to the barge and receives the vertical load of the weight suspended from the barge, and a vibration-stopping rope that connects the weight to the barge and receives the horizontal load of the weight suspended from the barge, the vibration-stopping rope having a higher elasticity than the suspension rope. This suspension system can suppress lateral swaying of the weight.

In one aspect, the vibration-stopping rope includes a rigid rope having one end and the other end, and a low-rigidity rope having one end and the other end and having higher elasticity than the rigid rope, and one end of the rigid rope may be connected to the barge, one end of the low-rigidity rope may be connected to the weight, and the other end of the rigid rope may be connected to the other end of the low-rigidity rope. According to this aspect, it is possible to suppress damage to the vibration-stopping rope while suppressing lateral swaying of the weight.

In one embodiment, the rigid rope may be a metal wire, and the low-rigidity rope may be a resin rope. By using a metal wire as the rigid rope, damage to the vibration-stopping rope can be suppressed. By using a resin rope as the low-rigidity rope, lateral vibration of the weight can be suppressed.

In one embodiment, the sinker may have a sensor that measures the attitude of the sinker. In this embodiment, the attitude of the sinker in water can be obtained.

Various aspects of the present invention can suppress lateral shaking of the weight.

FIG. 1 is a schematic diagram of a suspension system according to an embodiment. FIG. 1 is a perspective view showing an example of a water current power generation system. 1A to 1C are diagrams illustrating a step of a hanging method for a weight according to an embodiment. 1A to 1C are diagrams illustrating a step of a hanging method for a weight according to an embodiment. 13A is a graph showing the relationship between the weight of the weight and the amount of vertical displacement of the weight, and FIG. 13B is a graph showing the relationship between the weight of the weight and the amount of horizontal displacement of the weight. (a) is a graph showing the change in roll angle of the barge over time, (b) is a graph showing the change in pitch angle of the barge over time, (c) is a graph showing the change in roll angle of the weight over time, and (d) is a graph showing the change in pitch angle of the weight over time.

Below, an embodiment of the present disclosure will be described with reference to the drawings. In the following description, the same or equivalent elements will be given the same reference numerals, and redundant description will not be repeated. In the following description, the terms "upstream" and "downstream" are used with reference to the flow of water.

Figure 1 is a schematic diagram of a suspension system 1 according to one embodiment. The suspension system 1 suspends a weight 3 that moors a floating body 2 in water. "Suspension" refers to suspending and holding the weight 3. "Suspension" also includes stopping, lowering, or raising the suspended weight 3. As shown in Figure 1, the suspension system 1 includes a barge 11, a suspension rope 12 that receives the vertical load of the weight 3, and a vibration-stopping rope 13 that receives the horizontal load of the weight 3.

First, referring to FIG. 2, a water current power generation system 10 to which a suspension method according to one embodiment is applied will be described. FIG. 2 is a perspective view showing an example of a water current power generation system 10. The water current power generation system 10 generates power by using water currents. Typically, the water current power generation system 10 is installed in the sea and generates power by using ocean currents. As shown in FIG. 2, the water current power generation system 10 includes a float 2, a sinker 3, and a mooring line 4.

The float 2 is a floating water current power generation device that generates power using the water current FW while floating in the water. The float 2 is equipped with a pair of power generation pods 21 arranged at a distance on the left and right, and a cross beam 22 that connects the pair of power generation pods 21. The power generation pod 21 is composed of, for example, a hollow cylindrical body with closed front and rear portions. Note that the "front" refers to the part upstream of the water current FW, and the "rear" refers to the part downstream of the water current FW.

Each of the pair of power generation pods 21 is equipped with a generator (not shown). A turbine 23 is provided at the rear of the power generation pod 21. The turbine 23 is equipped with blades 24 and a hub 25. The blades 24 are blades that rotate when they receive the water flow FW, and extend radially from the hub 25. The hub 25 is rotatably provided with respect to the power generation pod 21 and is connected to the rotating shaft of the generator. When the turbine 23 rotates due to the water flow FW, the rotational force is supplied to the generator of the power generation pod 21, and electricity is generated by the generator.

The power generation pod 21 rotatably supports the turbine 23 while providing the turbine 23 with an appropriate buoyancy. The power generation pod 21 is cylindrical. The pair of power generation pods 21 have, for example, the same size and structure as each other.

The cross beam 22 is provided between the pair of power generation pods 21. The cross beam 22 extends so as to cross between the pair of power generation pods 21. The cross beam 22 has a wing shape to stabilize the attitude of the floating float 2. Both left and right ends of the cross beam 22 are fixed, for example, to approximately the center of the body of the power generation pod 21. The cross beam 22 may have a uniform cross-sectional shape in its extension direction, or may have a cross-sectional shape that changes in its extension direction. In addition, another power generation pod may be provided in the center of the cross beam 22.

The turbine 23 of the floating body 2 shown in FIG. 2 is a so-called downwind type turbine. The power generation pod 21 floats in a position facing the direction of the ocean current. In this floating state, the axis of rotation of the turbine 23 is maintained approximately horizontal. The turbine 23 may also be an upwind type turbine.

The weight 3 is an anchor or sinker. The weight 3 is made of, for example, concrete or metal, and has a rectangular parallelepiped shape. In order to keep the float 2 at a predetermined position in the water, the weight 3 has, for example, a mass of 60 t or more or 80 t or more. As described below, the weight 3 is suspended in the water by a barge 11. In one embodiment, the weight 3 may have a sensor 6 that measures the attitude of the weight 3 (see FIG. 1). For example, the sensor 6 is an acceleration sensor or an angular velocity sensor. The acceleration sensor measures the acceleration of the weight 3 in three axial directions. The angular velocity sensor measures the angular velocity of the weight 3 about three axes. The sensor 6 transmits information indicating the measured acceleration or angular velocity to the barge 11 by an acoustic signal. For example, the roll angle, pitch angle, and yaw angle of the weight 3 can be obtained from the angular velocity about the three axes.

The mooring line 4 connects the float 2 and the sinker 3. For example, the mooring line 4 is a metal wire for mooring the float 2 to the sinker 3. In the embodiment shown in FIG. 2, one end of the mooring line 4 branches into a Y shape and is connected to a pair of power generation pods 21 of the float 2. The other end of the mooring line 4 is connected to the sinker 3.

A power transmission cable 5 that transmits the generated power is connected to the power generation pod 21. The power transmission cable 5 is provided along the mooring line 4. The power transmission cable 5 may also include a communication cable for transmitting control signals to the power generation pod 21.

The lifting system 1 will be described with reference to FIG. 1. As described above, the lifting system 1 comprises a barge 11, a hoisting rope 12, and a swing stop rope 13. The barge 11 suspends and supports the weight 3. The barge 11 comprises a crane 17 disposed near the stern of the barge 11, and a winch 18 disposed near the bow of the barge 11. In other words, the crane 17 and winch 18 are disposed at positions offset in the fore-aft direction of the barge 11. For example, the crane 17 and winch 18 are spaced 40 to 50 m apart in the fore-aft direction of the barge 11.

The suspending rope 12 is a high-strength rope for suspending the weight 3, and is, for example, a metal wire. The suspending rope 12 connects the weight 3 to the barge 11, and bears the vertical load of the weight 3 when the weight 3 is suspended. The suspending rope 12 is connected to a crane 17 on the barge 11. The crane 17 raises or lowers the weight 3 by winding or unwinding the suspending rope 12.

The vibration-stopping rope 13 is a rope body for suppressing the lateral swaying of the weight 3, and has higher elasticity than the suspension rope 12. Note that "lateral swaying" refers to the horizontal swaying of the weight 3. The magnitude of the lateral swaying of the weight 3 corresponds to the magnitude of the roll angle and pitch angle of the weight 3. The vibration-stopping rope 13 connects the weight 3 to the barge 11, and bears the horizontal load of the weight 3 when the weight 3 is suspended. Since the horizontal load of the weight 3 is smaller than the vertical load of the weight 3, the strength of the vibration-stopping rope 13 may be weaker than the strength of the suspension rope 12. For example, the diameter (thickness) of the vibration-stopping rope 13 is smaller than the diameter of the suspension rope 12.

In one embodiment, as shown in FIG. 1, the vibration-stopping rope 13 is configured by connecting a rigid rope 14 and a low-rigidity rope 15 having higher elasticity than the rigid rope 14. The rigid rope 14 is, for example, a metal wire. The low-rigidity rope 15 is a rope made of resin such as nylon. The rigid rope 14 has a higher strength than the low-rigidity rope 15, and the low-rigidity rope 15 has higher elasticity than the rigid rope 14. By including the low-rigidity rope 15, the vibration-stopping rope 13 has higher elasticity than the suspension rope 12. One end of the rigid rope 14 is connected to the winch 18 of the barge 11, and one end of the low-rigidity rope 15 is connected to the weight 3. The other end of the rigid rope 14 and the other end of the low-rigidity rope 15 are connected to each other via a shackle 16. That is, the rigid rope 14 is arranged on the barge 11 side, and the low-rigidity rope 15 is arranged on the weight 3 side.

As described above, the rigid rope 14 of the anti-vibration rope 13 is connected to the winch 18 of the barge 11. The winch 18 adjusts the length of the anti-vibration rope 13 by winding or unwinding the anti-vibration rope 13. The length of the anti-vibration rope 13 refers to the length of the anti-vibration rope 13 unwound from the winch 18.

When the anti-vibration rope 13 is wound or unwound from the winch 18, the winch 18 comes into contact only with the rigid rope 14, and does not come into contact with the low-rigidity rope 15. Since the rigid rope 14 has a relatively high rigidity, it is not easily worn out even if it comes into contact with the winch 18 when the anti-vibration rope 13 is wound or unwound. Therefore, by locating the rigid rope 14 on the barge 11 side, damage to the anti-vibration rope 13 can be suppressed.

Next, a method for suspending the weight 3 according to one embodiment (suspension method) will be described with reference to Figures 1 and 3. In the following description, an example of test operation of the water current power generation system 10 with the weight 3 suspended in water will be described.

In one embodiment of a method for suspending the weight 3, first, the mooring line 4 to which the floating body 2 is connected is connected to the weight 3. Next, one end of the suspension line 12 and the vibration-stopping line 13 are connected to the weight 3 (connecting process). The suspension line 12 may be connected to the top surface of the weight 3, and the vibration-stopping line 13 may be connected to the side surface of the weight 3. The connecting work of the mooring line 4, the suspension line 12, and the vibration-stopping line 13 is performed, for example, on a barge 11. This connecting work may be performed in a port or the like with small waves. By performing the connecting work in a port, the connecting work can be performed smoothly.

The other ends of the suspension rope 12 and the anti-sway rope 13 are connected to the barge 11. More specifically, the other end of the suspension rope 12 is connected to a crane 17 of the barge 11. The other end of the anti-sway rope 13 is connected to a winch 18 of the barge 11. The power transmission cable 5 connected to the float 2 is arranged along the mooring rope 4 and the suspension rope 12, and the surplus portion is placed on the barge 11. The power transmission cable 5 may be connected to equipment mounted on the barge 11 to measure the amount of power generated by the pair of power generation pods 21.

Next, the barge 11 carrying the sinker 3 is moved to the installation area. When the barge 11 arrives at the installation area, the sinker 3 connected to the mooring line 4, the suspension line 12, and the swing-stop line 13 is suspended by the crane 17. Then, as shown in FIG. 3, the suspension line 12 is let out from the crane 17, and the sinker 3 is landed on the water. At this time, the vertical load of the suspended sinker 3 acts on the suspension line 12. At the same time that the suspension line 12 is let out, the mooring line 4 and the power transmission cable 5 are also let out from the barge 11, and the float 2 is placed at a position away from the barge 11. At this time, the float 2 may be towed by a tugboat to be placed at a position away from the barge 11.

Next, the suspending rope 12 is further unwound from the crane 17, and the sinker 3 is lowered. At this time, the anti-vibration rope 13 is unwound from the winch 18 according to the water depth of the sinker 3. For example, the length of the anti-vibration rope 13 (the amount of unwound of the anti-vibration rope 13) is adjusted to be 110% to 130% of the water depth of the sinker 3. For example, if the water depth of the sinker 3 is 100m, the length of the anti-vibration rope 13 is set to 110m to 130m. As a result, the length of the anti-vibration rope 13 is adjusted to be longer than the shortest distance between the sinker 3 and the winch 18, and slack occurs in the anti-vibration rope 13. The water depth of the sinker 3 may be determined from the amount of unwound of the suspending rope 12 from the crane 17, or may be determined from the output value of the sensor 6 mounted on the sinker 3.

When the sinker 3 reaches the target depth, the unwinding of the suspension rope 12 is stopped, and the sinker 3 is held suspended in the water. Figure 1 shows the sinker 3 suspended in the water. As shown in Figure 1, when the sinker 3 descends to the target depth, the float 2 connected to the mooring rope 4 descends together with the sinker 3 and floats in the water. The float 2 placed in the water receives the water current and generates electricity. The generated electricity is transmitted to the barge 11 by the power transmission cable 5. The electricity transmitted to the barge 11 is monitored by an operator on the barge 11, and the results of the test operation are evaluated.

As shown in FIG. 1, a vertical load due to gravity acts on the weight 3 suspended in the water. In one embodiment, the vertical load on the weight 3 is 80 t. This vertical load is supported by the suspension rope 12. A horizontal load also acts on the weight 3 suspended in the water. This horizontal load is supported by the anti-vibration rope 13. That is, the weight 3 is suspended from the barge 11 while the vertical load of the weight 3 is supported by the suspension rope 12 and the horizontal load of the weight 3 is supported by the anti-vibration rope 13 (suspension process).

The horizontal loads acting on the sinker 3 include the pulling force of the float 2, which is transmitted to the sinker 3 via the mooring line 4, and the pressure of the water current acting on the sinker 3. When these horizontal loads are transmitted to the sinker 3, the sinker 3 experiences lateral swaying. When lateral swaying occurs in the sinker 3, tension is applied to the sinker 3 from the anti-sway line 13 connected to the barge 11, thereby dampening the lateral swaying of the sinker 3.

In addition, lateral swaying of the weight 3 also occurs when the force caused by the swaying of the barge 11 is transmitted to the weight 3 via the anti-sway rope 13. In contrast, in one embodiment of the suspension method, a resin rope with high elasticity is used as the anti-sway rope 13, so even if the barge 11 sways laterally, the anti-sway rope 13 expands and contracts to absorb and suppress the force caused by the swaying of the barge 11. Therefore, the lateral swaying of the barge 11 is less likely to be transmitted to the weight 3. Furthermore, because the anti-sway rope 13 has high elasticity, the period of swaying of the barge 11 and the period of swaying of the weight 3 are less likely to match, and the amplification of the lateral swaying of the weight 3 is suppressed. Therefore, the horizontal swaying of the weight 3 suspended in water is suppressed.

In addition, in one embodiment of the method for suspending the sinker 3, the length of the anti-vibration rope 13 is adjusted so that the length is between 110% and 130% of the water depth of the sinker 3. This adjusts the length of the anti-vibration rope 13 to be longer than the shortest distance between the sinker 3 and the winch 18, causing slack in the anti-vibration rope 13. Therefore, the lateral swaying of the barge 11 is less likely to be transmitted to the sinker 3, and as a result, the lateral swaying of the sinker 3 can be more effectively suppressed.

In the above embodiment, an example has been described in which the float 2 is operated while the sinker 3 that moors the float 2 is suspended in the water, but the sinker 3 may be installed on the water bottom BT using the above-mentioned method of suspending the sinker 3. In this case, the suspending rope 12 is unwound from the crane 17 to lower the sinker 3 suspended in the water, and the sinker 3 is placed on the water bottom BT as shown in FIG. 4. When the sinker 3 is placed on the water bottom BT, the suspending rope 12 and the anti-sway rope 13 are detached from the barge 11. Next, the power transmission cable 5 is laid toward land. The electricity generated by the pair of power generation pods 21 of the float 2 is transmitted to land via the power transmission cable 5 laid on the water bottom BT.

Next, we will explain the effects of the suspension method according to one embodiment based on the results of various experiments.

Figure 5(a) is a graph showing the relationship between the weight of the weight 3 and the vertical displacement of the weight 3. Figure 5(b) is a graph showing the relationship between the weight of the weight 3 and the horizontal displacement of the weight 3. As shown in Figure 5(a), as the weight of the weight 3 increases, the vertical displacement (vertical vibration) of the weight 3 decreases. This result is thought to be because the effect of disturbance on the weight 3 decreases relatively as the weight of the weight 3 increases. Note that, as shown in Figure 5(a), when the weight of the weight 3 becomes 80,000 kgf (80 tf) or more, the vertical displacement of the weight 3 converges at a predetermined value, and even if the weight of the weight 3 increases further, the vertical displacement of the weight 3 does not decrease. The above-mentioned tendency was the same whether a metal wire or a nylon rope was used as the vibration-stopping rope 13.

In contrast, as shown in Figure 5(b), when a metal wire was used as the anti-vibration rope 13, it was confirmed that the horizontal displacement (lateral sway) of the weight of the weight 3 increased as the weight of the weight 3 increased. It is presumed that this phenomenon occurred because the period of swaying of the barge 11 and the period of swaying of the weight 3 coincided, amplifying the lateral swaying of the weight 3. On the other hand, as shown in Figure 5(b), when a nylon rope with high elasticity was used as the anti-vibration rope 13, it was confirmed that the horizontal swaying of the weight 3 decreased compared to when a metal wire was used. It is presumed that this result was due to the fact that it became more difficult for the load to be transmitted from the barge 11 to the weight 3 via the anti-vibration rope 13.

Next, reference is made to Figures 6(a) to (d). Figures 6(a) to (d) show the relationship between the lateral sway of the barge 11 and the lateral sway of the weight 3 when the weight 3 is suspended using the suspension system 1 according to one embodiment. Specifically, Figure 6(a) is a graph showing the change over time in the roll angle of the barge 11, and Figure 6(b) is a graph showing the change over time in the pitch angle of the barge 11. Figure 6(c) is a graph showing the change over time in the roll angle of the weight 3, and Figure 6(d) is a graph showing the change over time in the pitch angle of the weight 3. The results shown in Figures 6(a) to (d) were measured using a metal suspension rope 12 and a vibration-stopping rope 13 including a nylon rope.

As shown in Figures 6(a) and (b), the roll angle and pitch angle of the barge 11 changed over time due to the influence of waves and wind. The amplitude of the roll angle and pitch angle of the barge 11 corresponds to the magnitude of the lateral sway of the barge 11. In contrast, as shown in Figures 6(c) and (d), when the weight 3 was suspended using the suspension system 1, the amplitude of the roll angle and pitch angle of the weight 3 remained small even when the lateral sway of the barge 11 increased. From these results, it was confirmed that the suspension method according to one embodiment can suppress the lateral sway of the weight 3.

The above describes the method for suspending a weight and the suspension system 1 according to various embodiments, but the invention is not limited to the above-described embodiments and can be modified in various ways without changing the gist of the invention.

For example, the method of suspending the sinker can be used not only when installing the sinker, but also when removing the sinker 3 installed on the water bottom BT. For example, when removing the sinker 3, an underwater robot or the like is used to retrieve the suspending rope 12 and the anti-sway rope 13 left behind on the water bottom BT, and connect them to the crane 17 and winch 18 of the barge 11, respectively. Then, the sinker 3 is hoisted while the suspending rope 12 bears the vertical load of the sinker 3 and the anti-sway rope 13 bears the horizontal load of the sinker 3. The sinker 3 is then raised close to the barge 11, and the sinker 3 is retrieved together with the float 2 to the barge 11. By hoisting the sinker 3 while the anti-sway rope 13 bears the horizontal load of the sinker 3, the lateral swaying of the sinker 3 when hoisting the sinker 3 can be suppressed.

In the above-described embodiment, the vibration-stopping rope 13 includes a metal rigid rope 14 and a resin low-rigidity rope 15, but the entire vibration-stopping rope 13 may be made of resin. By making the entire vibration-stopping rope 13 a resin rope, the elasticity of the vibration-stopping rope 13 can be improved.

Reference Signs List 1: Suspension system 2: Floating body 3: Weight 6: Sensor 11: Barge 12: Suspension rope 13: Vibration prevention rope 14: Rigid rope 15: Low-rigidity rope

Claims (8)

A method for suspending a sinker for mooring a floating body in water, comprising the steps of:
A step of connecting a suspension rope and a vibration-stopping rope having higher elasticity than the suspension rope to the weight;
a step of suspending the weight in water from a barge while the vertical load of the weight is received by the suspension rope and the horizontal load of the weight is received by the anti-sway rope;
A method comprising: The vibration-proof rope includes a rigid rope having one end and the other end, and a low-rigidity rope having one end and the other end and having higher elasticity than the rigid rope,
One end of the rigid rope is connected to the barge,
One end of the low-rigidity rope is connected to the weight,
The method of claim 1 , wherein the other end of the stiff rope is connected to the other end of the low stiffness rope. The method according to claim 2, wherein the rigid rope is a metal wire and the low-rigidity rope is a resin rope. The method according to any one of claims 1 to 3, comprising a step of adjusting the length of the anti-vibration rope so that the length of the anti-vibration rope is 110% or more and 130% or less of the water depth of the sinker. A suspension system for suspending a weight for mooring a floating body in water, comprising:
With a barge,
a suspension rope that connects the weight and the barge and receives a vertical load of the weight suspended from the barge;
a vibration-stopping rope that connects the weight and the barge and supports a horizontal load of the weight suspended from the barge;
Equipped with
A suspension system, wherein the anti-vibration rope has higher elasticity than the suspension rope. The vibration-proof rope includes a rigid rope having one end and the other end, and a low-rigidity rope having one end and the other end and having higher elasticity than the rigid rope,
One end of the rigid rope is connected to the barge,
One end of the low-rigidity rope is connected to the weight,
The suspension system according to claim 5 , wherein the other end of the rigid rope is connected to the other end of the low rigidity rope. The suspension system according to claim 6, wherein the rigid rope is a metal wire and the low-rigidity rope is a resin rope. The suspension system according to any one of claims 5 to 7, wherein the weight has a sensor that measures the attitude of the weight.

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