JPS6154640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for mooring a floating body on the ocean or the like using mooring ropes.

The floating body is moored, for example, by a catenary mooring line. A mooring tension that increases as the floating body moves away from the mooring point acts on the mooring line. Moreover, this mooring tension increases rapidly when the mooring line is under tension. These mooring characteristics are unfavorable for the mooring line and may cause the mooring line to break.

An object of the present invention is to provide a mooring device that has mooring characteristics such that the mooring tension does not increase rapidly with respect to the displacement of the floating body, thereby preventing breakage of the mooring rope.

In order to achieve the above object, the present invention has one end of a mooring cable attached to a floating body, furthermore, this mooring cable is supported by a sliding member in its middle part, and the other end is suspended from the sliding member. A predetermined length of the mooring cable is attached to the seabed, and the weight per unit length of the bottom part of the mooring cable is heavier than the other parts.

According to this invention, when the floating body moves and the tension of the mooring line increases, the bottom part of the mooring line is lifted, the mooring line is let out, and its weight is changed to moor the floating body. Therefore, the mooring characteristics can be set such that the mooring tension does not suddenly increase with respect to the displacement of the floating body. Therefore, this can prevent the mooring cable from breaking.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the moored state of the floating body. The floating body A is tethered by a first mooring line 1. An intermediate buoy 2 is floating on the side of this floating body A. This intermediate buoy 2 is tethered to the seabed B by a second mooring line 3. To this intermediate buoy 2,
A mooring line sliding member 4 is provided. This sliding member 4 is for slidably supporting the mooring line 1, and is, for example, a pulley, a simple shaft or hole, or a part of a structure. The first mooring line 1 has one end attached to the floating body A, is supported by a sliding member 4 in the middle thereof, and the other end hangs down from the sliding member 4 and is placed on the seabed B for a predetermined length. . This bottom landing part (shown in Fig. 1 1a) has a length so that at least its tip will not leave the seabed B when the mooring line 1 moves up and down due to movement of the floating body A and the intermediate buoy 2. has been decided. A plurality of weights 5 are attached to the bottom portion 1a at predetermined intervals. Note that the portion of the mooring line 1 that hangs down from the sliding member 4 is hereinafter referred to as the hanging portion 1b.

When the floating body A moves away from the intermediate buoy 2 from a stationary state, the mooring line 1 is pulled and the tension acting on it increases. When this tension increases, the bottomed part 1a of the first mooring line 1 is lifted, and the hanging part 1b is let out in the direction of the floating body A. Accordingly, the weight 5 of the bottom landing part 1a is lifted one by one, and the weight of the mooring rope 1 increases. Then, when this weight and the tension of the mooring line 1 are balanced out, the floating body A comes to rest again. In this way, the weight of the mooring rope 1 is changed in accordance with the tension of the mooring rope 1, and the floating body A is thereby tethered, so that the mooring tension does not increase suddenly.

In addition, such mooring characteristics can be easily changed by appropriately distributing the weight between the bottom landing part 1a and the hanging part 1b of the mooring rope 1. Bottom landing part 1a of mooring line 1
In addition to attaching the weight 5 to this, by changing the thickness and type of the mooring rope 1 itself, the weight per unit length can be changed, and the weight can be changed almost arbitrarily. An example of the mooring characteristics thus obtained is shown in FIG. That is, in Fig. 4, A makes the unit length weight of the bottom landing part 1a and the hanging part 1b the same (therefore, the weight 5 is not attached to the bottom landing part 1a), and the mooring force Tx is constant with respect to the displacement X. In this case, B is the weight 5 attached to the bottom landing part 1a at regular intervals to increase the mooring force Tx stepwise, C is the mooring force Tx that increases linearly, and D is the mooring force Tx that increases the mooring force Tx linearly. In each case, the unit length weight of the bottom contact portion 1a is increased so that the weight increases sequentially. Further, for reference, the case where the floating body is simply moored only by the mooring rope is shown as E. As is clear from FIG. 4, the mooring characteristics can be easily changed by changing the weight of the bottom landing part. Therefore, it is easy to provide mooring characteristics that prevent the mooring tension from increasing rapidly.

FIG. 2 shows a modification of the above embodiment. This modification is suitable for mooring the floating body A in shallow waters. In this modification, intermediate buoys 21, 22, 23
The intermediate buoys 21, 22, 23 are interconnected by a plurality of mooring ropes 11, 12, 13. That is, the floating body A is connected to each intermediate buoy 21, 22 of each mooring line 11, 12, 13,
It is held together by the weight of the part that hangs down from 23.

Another variant is shown in FIG.
This modification attempts to connect the floating body A using an underwater structure C, and the sliding member 4 in the above embodiment is provided on this underwater structure C. In this way, the sliding member 4 is not limited to the intermediate buoy, but can be installed at any suitable location.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, FIG.
Side views showing the moored state of the floating body, Figures 2 and 3
The figure is a side view showing a modified example, and FIG. 4 is a graph showing mooring characteristics. 1... Mooring rope, 1a... Bottom landing part, 4... Sliding member, A... Floating body, B... Seabed.

Claims (1)

[Claims] 1 One end of the mooring line 1 is attached to the floating body A, and this mooring line 1 is further supported by the sliding member 4 at its intermediate portion, and the other end thereof hangs down from the sliding member 4 for a predetermined length. is brought to the bottom of the seabed B, and the unit length weight of the bottom landing part 1a of this mooring line 1 is made heavier than other parts,
Floating mooring device.