JPH0524282Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mooring device using a multi-sided anchor.

(Prior art) Conventionally, floating fish reefs, observation buoys, etc. are usually moored at one point, and this mooring method includes tension mooring as shown in Figure 3a, or catenary mooring as shown in Figure 3b. There are two types of methods. The tension mooring shown in Figure 3a is fixed to the seabed 2 using a heavy anchor (sinker), and in the catenary mooring shown in Figure 3b, a chain with a certain amount of self-weight is used in the mooring line. The mooring line has a catenary curve so that the chain always lies on the seabed, and is fixed to the seabed with a holding power anchor.

(Problem to be solved by the invention) In the case of the tension mooring described above (see Figure 3 a), there is little change in position due to the influence of tidal currents, etc., but in addition to generating large tension in the mooring line, it also has to carry its own weight. There is a problem in that a heavy anchor is required as a base. On the other hand, catenary mooring (see Figure 3b) does not have the same problems as tension mooring, but there is a problem in that the position cannot be determined depending on the direction of the current. Therefore, multi-point mooring as shown in FIG. 4 is employed to maintain fixed-point positions. In the figure, 4 indicates a moored object and 5 indicates the sea surface. Although the mooring method shown in Figure 4 is a considerable improvement, if the length of the mooring line cannot be adjusted using a winch on the mooring object during mooring construction, it is necessary to place the anchor in a predetermined position and It is necessary to carry out various difficult maritime operations to ensure holding power.

(Means for Solving the Problems) The present invention uses a planar shape of the anchor as a polygon whose sides are integrally connected, such as a triangle, and each vertex of the polygon (referring to the connected connecting part). A multi-sided anchor is used, characterized in that gripping claws are formed on the lower side, the lower ends of the mooring lines are connected to each gripping claw, and the upper ends of each mooring line are bundled into one and connected to the mooring object. This is the mooring device.

(Function) Since the planar shape of the anchor is a polygon whose sides are integrally connected, such as a triangle, and has gripping claws at each vertex, each of the gripping claws has an effective grip in each direction. Has parking power. However, since the mooring line is taken from each gripping claw and bundled into one line at the upper end and connected to the mooring object, the size of the polygonal anchor is determined by taking into consideration the magnitude of the external mooring force and the buoyancy of the mooring object. By appropriately setting the underwater weight of the mooring line and leaving the polygonal anchor lying on the seabed, it is possible to ensure that only external forces in the horizontal direction act on the polygonal anchor. This external force can be resisted by the anchor provided with the gripping claws below, thereby mooring the moored object within the predetermined area. Further, when the moored object is moved by a large impact due to the height of large waves, by lifting the polygonal anchor, it is possible to prevent excessive tension from being generated in the mooring line.

(Example) Next, an example of the present invention will be explained using figures.
In Fig. 1, reference numeral 1 denotes a rigid anchor, and the anchor 1 has a planar shape that is an integral polygon (triangular in this example) in which both ends of each side are sequentially connected.
At its lower end, gripping claws 1a, 1b, and 1c are formed that protrude downward, and the lower side of this polygonal anchor is configured to land on the seabed 2. A mooring line is connected to chain 3 from each gripping claw.
a, 3b, 3c, these mooring lines are bundled at their upper ends into a single mooring line 3, which is connected to a mooring object 4.

By configuring in this way, the moored object 4
The effect of tidal current, which is a characteristic of catenary mooring, is
It can be maintained by the weight of the chains 3a, 3b, 3c lying on the seabed formed below the mooring line 3 and the gripping force generated by the gripping claws 1a, 1b, 1c biting into the seabed. It's possible, and
When a moored object is moved by a large impact due to the height of a large wave, one end of the rigid polygonal anchor 1 lifts up, as shown in FIG. 2, and the mooring line 3
This prevents excessive tension from being generated at the other end, and the gripping claws at that part dig into the seabed at the other end, so the overall position does not move.

(Effects of the invention) As explained above, the present invention eliminates the large movement of the catenary's position depending on the direction of the current, unlike in the case of conventional single-point mooring, and makes it possible to use a tension mooring method or a multi-point mooring method. The moored object can be held in position in this way, and unlike the tension mooring method, large tensions are not generated due to the influence of waves, making full use of the inherent characteristics of catenary mooring, making it extremely effective. In addition, in the case of multi-point mooring, only some of the anchors resist the external mooring force, whereas in the present invention, the entire anchor always resists the external force. Note that the present invention is effective both when the moored object is on the sea surface and when it is completely submerged.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an embodiment of the present invention, Figure 2 is a side view to explain the influence of tidal currents, and Figure 3 a.
is a side view to explain conventional tension mooring;
FIG. b is a side view of the case of catenary mooring, and FIG. 4 is a side view of another type of catenary mooring system. 1... Polygonal anchor, 1a, 1b, 1c...
Gripping claw, 2... seabed, 3... mooring line, 3a,
3b, 3c... Chain, 4... Moored object, 5...
Sea surface.

Claims (1)

[Scope of utility model registration request] The planar shape of the anchor is a polygon whose sides are integrally connected, such as a triangle, gripping claws are formed below each vertex of the polygon, and the lower ends of the mooring lines are connected to each gripping claw. A mooring device using a multi-sided anchor, characterized in that the upper ends of each mooring line are bundled into one line and connected to a mooring object.