JPH07101379A - Floating structure mooring structure - Google Patents

Abstract

(57) [Summary] [Purpose] To realize a mooring structure that can follow the rise and fall of the water level while suppressing the lateral movement of the floating body. [Structure] A mooring structure in which a levitation structure 1 floated on the water surface is moored by anchoring lines 3 to an anchor 2 fixed to a ground 4 at the bottom of the water, and the anchor 2 is a fixed anchor portion fixed to the ground 4 at the bottom of the water 21 and a movable anchor portion 22 which can move relative to this via an inclined sliding surface 23. One end of the mooring cable 3 is a fixed anchor portion 21, and the other end is a movable anchor portion.
The mooring cable 3 is tightly connected to the cable 22 and is slidably locked to the locking member 11 provided on the floating structure 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mooring structure for mooring a floating structure such as a buoy, a work pontoon or other harbor which is floated on the water surface to an anchor fixed to the water bottom.

[0002]

2. Description of the Related Art Buoys, work pontoons, and other floating structures that are levitated on the surface of water such as ports (hereinafter collectively referred to as floating bodies)
In order not to drift or collide with other floating bodies or ships, the boat is moored to a plurality of anchors fixed to the bottom of the water by mooring lines such as chains and ropes as shown in FIG. 1 is a floating body, 2 is an anchor, 3 is a mooring line, 4
Is the bottom of the water.

Since the floating body also rises and falls as the water level fluctuates, the mooring line usually requires some margin even at the highest water level, and the length L of the mooring line is L = d × 1.5 + Δd (however, d is the maximum water depth, and Δd is the water level difference), which are connected to the floating body in a loose state.

[0004]

By the way, when waves, wind or other external force from the horizontal direction acts on the floating body in this state, the floating body moves as shown by the broken line in FIG. In particular, when the water depth or water level difference is large, the amount of movement is large, and if there are many moored ships in an anchorage such as a narrow harbor, the risk of collision with the floating body increases.

In order to avoid such a danger, if the mooring line is shortened so that the mooring line is tense even at a low water level, the floating body cannot rise to the surface of the water when the water level becomes high, and the function of the floating body is reduced. I can't show it. An object of the present invention is to solve the above problems and to realize a mooring structure of a floating body that can keep the mooring line in a tensioned state at all times to suppress the lateral movement of the floating body and can follow the rise and fall of the water level. And

[0006]

SUMMARY OF THE INVENTION The present invention is a mooring structure for a levitation structure in which a levitation structure levitated on the water surface is moored to an anchor fixed to the ground of the water bottom by mooring lines. It consists of a fixed anchor part that is fixed to the ground and a movable anchor part that can move relative to the fixed anchor part through an inclined sliding surface. One end of the mooring line is the fixed anchor part and the other end is the movable part. A mooring structure for a floating structure, wherein the mooring line is tightly connected to an anchor part and the mooring line is slidably locked to a locking member provided on the floating structure, and further, a fixed anchor part and a movable anchor. The mooring structure of the floating structure is provided with a sliding mechanism on an inclined sliding surface between the floating structure and the portion.

[0007]

[Operation] According to the present invention, the anchor fixed to the ground on the bottom of the water is divided into two parts, and the fixed anchor part fixed to the ground on the bottom of the water and the fluctuation of the water level are tracked as in the conventional case,
Since it is composed of the fixed anchor portion and the movable anchor portion that moves relative to each other via the sliding surface, the mooring line always maintains the tension state regardless of the fluctuation of the water level, and the floating body does not freely move laterally.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 is a plan view, FIG. 2 is a front view, and the same reference numerals are used for the same elements as in FIG. 5 above, but the anchor is composed of a fixed anchor portion 21 and a movable anchor portion 22. . FIG. 2A shows a state in which the floating body 1 has risen at a high water level such as during high tide, and FIG. 2B shows a state in which the floating body 1 has descended at a low water level such as during low tide.

The mooring line 3 has a fixed anchor portion at one end with a locking member 11 such as a pulley provided on the floating body 1 as a turning point.
21, the other end is tightly connected to the movable anchor portion 22, and the mooring line 3 is slidably locked at the locking member 11 of the floating body 1,
That is, it is only wrapped around the locking member 11 and folded back, and is not fixed. For example, at low water level
As shown in (b), the fixed anchor portion 21 and the movable anchor portion 22
Are in close contact with each other, and when the floating body 1 rises due to the rise of the water level and the distance between the ground 4 at the bottom of the water and the floating body 1 increases, the position of the fixed anchor portion 21 does not change, and the total length of the mooring line 3 is also constant. , The movable anchor portion 22 is pulled up, and as shown in FIG.
It moves relative to the fixed anchor portion 21 as indicated by the arrow in (a). Movable anchor part 22 at the highest water level at that point
A stopper is provided between the two so as to prevent further movement within the position of. As a stopper
Although the sliding portion that relatively moves may be provided with a protrusion or the like, the fixed anchor portion 21 and the movable anchor portion 22 may be connected by a wire rope or the like.

3 and 4 show an example of a sliding mechanism provided on an inclined sliding surface 23 between the fixed anchor portion 21 and the movable anchor portion 22. The sliding direction is preferably a direction corresponding to the angle at which the mooring line 3 is stretched. As a sliding mechanism, in FIGS. 3 and 4, a plurality of freely rotatable rollers 24 are attached to either side of the inclined sliding surface 23, for example, the inclined surface on the fixed anchor portion 21 side. 25 is a mounting frame, and 26 is an anchor bolt. As the bearing of the roller 24, a sealed bearing is used considering that it is difficult to maintain in water, or a sliding bearing that is lubricated with water is used.In some cases, the mounting hole of the frame 25 for mounting the rotating shaft is large. You can also respond by doing. In addition, instead of the rollers 24, ball-shaped members may be lined up, or a plate-shaped sliding member having a low friction coefficient such as fluororesin may be attached.

In order to prevent the inclined sliding surface 23 from separating,
It is desirable to provide a guide groove, a continuous protrusion, or the like on the sliding surface or in parallel with the sliding surface. The fixed anchor part
As means for fixing 21 to the bottom of the water, fixing only by gravity, providing a hook-shaped protrusion, using these together, etc.,
It is exactly the same as the conventional anchor.

Since the movable anchor portion 22 moves due to the vertical movement of the floating body 1, it is necessary to have a weight corresponding to the buoyancy of the floating body 1. If the movable anchor part 22 is too heavy, the floating body 1
Even if he tries to move up and down, the movable anchor portion 22 does not lift and cannot follow the water surface. On the contrary, when the movable anchor portion 22 is too light, the tension applied to the mooring line 3 is insufficient, and the lateral movement of the floating body 1 cannot be suppressed.

The locking member 11 of the mooring line 3 provided on the floating body 1 is
The mooring line 3 may be simply wrapped around the tubular body such as a steel pipe, or the mooring line 3 may be provided with a pulley or the like that can freely rotate.
May be wrapped around.

[0014]

According to the present invention, the mooring line can be kept in tension while keeping up with the vertical change of the water surface to suppress the lateral movement of the floating body. Therefore, when the mooring is congested in a narrow anchorage. However, there is an excellent effect that the danger such as a collision is eliminated, and the work of performing an inspection or an emergency procedure in case of stormy weather is unnecessary.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a front view showing a part of the embodiment of the present invention.

FIG. 4 is a perspective view showing a part of the embodiment of the present invention.

FIG. 5 is a front view showing a conventional technique.

[Explanation of symbols]

 1 Floating body 2 Anchor 21 Fixed anchor part 22 Movable anchor part 23 Inclined sliding surface 24 Roller 25 Mounting frame 26 Anchor bolt 3 Mooring line 4 Ground

Claims (2)

[Claims] 1. A mooring structure for a levitation structure, wherein a levitation structure (1) levitated on the water surface is moored by an anchoring line (3) to an anchor (2) fixed to a ground (4) at the bottom of the water,
The anchor (2) is composed of a fixed anchor portion (21) fixed to the ground (4) at the bottom of the water, and a movable anchor portion (22) capable of relatively moving through the fixed anchor portion (21) and the inclined sliding surface (23). Then
One end of the mooring line (3) is provided with the fixed anchor portion (21).
The other end is tightly connected to the movable anchor portion (22), and the mooring line is slidably locked to a locking member (11) provided on the floating structure (1). Mooring structure for levitating structures. 2. A sliding mechanism (24, 2) is provided on an inclined sliding surface (23) between the fixed anchor portion (21) and the movable anchor portion (22).
The mooring structure for a levitating structure according to claim 1, further comprising 5).