JPS5835909B2 - anchor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anchor used for mooring a floating body on the sea.

Offshore structures consisting of floating bodies are often moored at sea using anchors.

Furthermore, even if a large number of oil tank ships are floated in an oil storage tank yard surrounded by a sea wall or breakwater and moored with mooring dolphins instead of anchors, it is possible to In some cases, it becomes necessary to temporarily moor a tank ship offshore with an anchor.

An anchor for mooring a floating body needs to have a large holding power so that the floating body does not easily move due to wind waves, currents, etc.

The holding power of the anchor can also be increased by increasing the weight of the anchor, but this increases cost and is not easy to handle.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an anchor having a simple structure, relatively light weight, and a large holding power.

The present invention will be explained below with reference to embodiments shown in the drawings.

The main body 1 of the anchor is formed of a steel plate into a short hollow substantially truncated conical shape, and has a hybrid structure in which concrete 2 is filled inside.

The top plate 3 of the main body 1 is formed in an inclined shape slightly concave downward,
The bottom plate 4 is formed in an inclined shape with a slightly higher central portion.

Further, a cylindrical inner plate 5 is provided at the center of the main body 1, and a varicella hole 6 is formed therein.

A shaft 9 is rotatably mounted in the hole 6 and has a bearing 7 and a rivet mounting portion 8 formed at its upper end.

Furthermore, although not shown in the drawings, a reinforcing steel material is appropriately placed inside the hollow portion of the main body 1.

A large number of ribs 10b are provided at equal intervals on the outer periphery of the bottom surface of the main body 1.
3 radially arranged.

These ribs 10 are made of a trapezoidal steel plate, and have an inclined edge 11 facing outward and upward protruding outward from the same edge outside the main body 1, and are arranged so that the bottom edge 12 is horizontal. It is fixed vertically to the bottom plate 4.

Further, the bottom edge 12 of each rib 10 is fixed to the upper surface of a reinforcing steel plate 13 having a horizontal annular shape.

The lower part of each rib 10 has an acute angle.

As shown in FIG. 1, this anchor is preferably installed with at least the lower part of the main body 1 buried in sludge, mud, sand, etc. (hereinafter referred to as earth and sand) 14 deposited on the seabed.

If installed in this way, the resistance will be extremely high even when pulled in any direction by wind waves, tides, etc., so a large holding force can be obtained.

However, the anchor may simply be placed on top of the sediment on the ocean floor.

Even in this case, no matter which direction the anchor is pulled, the rib 10 at the tip in the pulling direction and the outside and inside of the main body 1 dig into the earth and sand and stop, so a large holding force can be obtained as above. .

At this time, a space exists between the ribs 10 on the bottom surface of the main body 1, and this becomes a passage for the earth and sand, so that the anchor can penetrate the earth and sand even better.

Even if the tension direction b3 changes from the state in which the rib 10 and the outer circumferential part of the main body 1 dig into the earth and sand as described above, the outer and inner parts of the rib 10 and the main body 1 at the tips in the new tension direction dig into the earth and sand, and the anchor stops without moving much laterally.

Therefore, a large holding force can be obtained against the tensile force in any direction.

The structure of the pot body 1, the shape of the top and bottom surfaces of the body 1, the structure of the chain attachment shaft 9, the shape of the ribs 10, etc. are not limited to those of this embodiment, and the reinforcing plate 13 of the ribs 10 is not necessarily required.

According to the anchor of the present invention, the main body 1 having rigidity is formed into a short substantially truncated conical shape, and the lower part of the outer circumference of the numerous ribs 10 provided radially on the outer periphery of the bottom surface of the main body 1 forms an acute angle. , not only when the main body 1 is installed with at least the lower part buried in the sand on the seabed, but also when it is simply placed on the sand on the seabed, the rib 10 forming an acute angle and the short, generally conical shape having rigidity Since the outer periphery of the trapezoidal main body 1 easily digs into the earth and sand, a large holding force can be obtained without increasing the weight of the anchor itself.

In addition, even if the pulling direction changes, the rib 10 at the tip in the pulling direction and the outer periphery of the main body 1 immediately bite into the earth and sand and stop, so the anchor hardly moves laterally and can be moved in any direction. A large holding force can be obtained even against a tensile force of .

[Brief explanation of drawings]

The drawings show an embodiment of the invention, with FIG. 1 being a partially cutaway front view and FIG. 2 being a plan view. 1...Body, 10...Rib.

Claims (1)

[Claims] 1. An anchor consisting of a rigid, short, substantially truncated conical main body 1, and a number of ribs 10 radially provided on the outer periphery of the bottom surface of the main body 1, the lower part of the outer periphery of which forms an acute angle.