JPS62292585A - Single point mooring device - Google Patents

Abstract

PURPOSE:To provide a single mooring device which may prevent hydraulic force and bumps of a moored floating body, and which has an excellent mooring spring characteristic, by installing all of main parts of the mooring device on the sea bottom, and by providing an underwater connecting rod, a weight for the same, a buoyancy tank, a mooring cable and the like. CONSTITUTION:An underwater rotary bed 8 is set on an underwater rotary bed base 7 firmly installed on the sea bottom, and is connected with an underwater connecting rod 9 by means of a hinge 10'. A weight 10 is attached to the free end of the underwater connecting rod 9 which are supported together with the weight 10 by means of an underwater connecting rod sling member 12 so that the underwater connecting rod 9 and the weight 10 are prevented from making contact with the sea bottom. A mooring cable A13 is connected to a small buoy 14 on the sea surface while a mooring cable B15 is connected between the small buoy 15 and a moored floating body 4. The above-mentioned small buoy B15 is adapted to be used for handling the mooring cable B15 in order to moor and release the moored floating body 4.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to a single point mooring device for a moored floating body.

[Conventional technology]

Representative examples of conventional single-point mooring devices are shown in FIGS. 3 and 4.

Figure 3 is an overall elevational view of a jacket-type single-point mooring device. A turntable (2) that can freely rotate is installed in the horizontal direction above the jacket (1), which is firmly fixed to the seabed surface. A mooring floating body (4) is moored by a mooring line (3) connected to the mooring line (3). The mooring floating body (4) transmits its mooring force to the turntable (2) via the mooring line (3) while swinging around the wind, waves, and currents (11). ) and transmitted to the ocean floor.

FIG. 4 is an overall elevational view of the CALM type single point mooring device, in which the buoy (5) is moored to the seabed by a plurality of mooring chains (6). A turntable (2) that can rotate freely in the horizontal direction is installed on the buoy (5), and a mooring floating body (4) is moored by this turntable (2) (two mooring lines (3) connected together). The moored floating body (4) is moved by the buoy (
While swinging around the mooring line (3), the mooring force is applied to the mooring line (3).
), a turntable (2), a buoy (5) and a mooring chain (6) to transmit it to the seabed.

[Problem that the invention seeks to solve]

However, such a conventional single point mooring device C2,
Depending on the sea area where they are installed, there are the following problems.

■In the case of the jacket method (1) Mooring with only the mooring rope has stiff mooring spring characteristics;
When mooring a large moored floating body, a large force acts on the jacket. Therefore, it is limited by sea and weather conditions.

(2) Excessive ice pressure acts on the jacket, especially in icy areas.

(3) The collision of the moored floating body with the jacket caused severe damage to both sides.

]'1. In the case of the CALM method (1) Although the mooring rope and mooring chain have excellent mooring spring characteristics, the ice pressure acting on the buoy in icy waters is large, making it unsuitable for both reliability and economy.The present invention attempts to solve these problems. All the main parts of the mooring device are installed on the seabed surface to avoid water pressure and collisions with moored floating bodies, and the underwater connection, its weight, and mooring line provide excellent mooring spring characteristics. The purpose is to provide a single point mooring device.

[Means for solving problems]

Therefore, the one-point mooring device of the present invention is a one-point mooring device that moors a moored floating body via a mooring line, and includes an underwater rotating platform installed on the seabed, an underwater connecting culm hinged to the underwater rotating platform, and an underwater connecting culm that is hinged to the underwater rotating platform. It is characterized by comprising a buoyancy tank provided on the sea surface to support a weight at the tip of the connecting culm, and a mooring line connecting the buoyancy tank or the underwater connecting culm to the mooring floating body.

[For production]

With the above configuration, a moored floating body that is subjected to external forces, such as wind, waves, and currents, has a soft mooring system that combines the spring characteristics of the mooring rope and the spring effect of the vertical movement of the connecting rod, so that a strong force is not applied to the rotating table. It swings around the rotating table without any action. In addition, since the rotary table and connecting pipes are on the seabed, there is no need for moored floating bodies to collide with each other.

〔Example〕

The drawings (2) and (2) a single-point mooring device (as a first embodiment of the present invention) will be explained below. Fig. 1 shows an overall elevational view of the present invention. This mooring device is firmly installed on the seabed surface. The underwater turntable (8) is installed on the underwater turntable foundation (7), and is connected to the underwater connection pin (9) by a hinge αO.A weight 0■ is attached to the other side of the underwater connection pin (9). , the underwater connection (9) and this weight uO) are supported by the buoyancy tank (1°C) and the underwater connection suspension material (]z, and the underwater connection (9) and this weight (ICIl) are supported by the buoyancy tank (1℃) and the weight (ICIl) are in contact with the seabed. The mooring line A Q3) is tied from the weight 0α to the small buoy aa on the sea surface, and the mooring line B (151 is connected to this small buoy (
14) to the moored floating body (4). Small buoy Oa
is used to rope the mooring line BQ51 on the sea surface for attaching and detaching the mooring floating body (4). According to this embodiment, all the main parts of the device are installed on the seabed surface, so there is no collision with the mooring floating body (4), no influence of ice or wave pressure on the mooring device, and mooring lines AQ31, The vertical movement of the mooring line B (15) and the weight qσ (2) provides soft mooring spring characteristics, which is effective in mooring the moored floating body (4) economically and safely.

FIG. 2 is an overall elevational view showing a second embodiment of the present invention,
Mooring line A in Figure 1 (131 is connected to the buoyancy tank Qll)
This figure shows an example of a small buoy (14).

〔Effect of the invention〕

As detailed above, the one-point mooring device of the present invention has the following effects.

(1) Compared to the conventional type (2), all the main parts of the device are installed on the seabed surface, so collisions between the device and the moored floating body can be avoided.

(2) There is almost no influence of ice or waves on the equipment,
Overall mooring force decreases.

(3) Effective mooring spring characteristics are exhibited by the vertical movement of the underwater connecting can with a weight and the combined spring characteristics of the mooring rope, and the holding force is reduced.

[Brief explanation of drawings]

Figures 1 and 2 show the first and second mooring devices of the present invention.
FIGS. 3 and 4 are overall elevational views showing the conventional apparatus. 4... Mooring floating body, 8... Underwater rotating table, 9... Underwater connection, 10... Weight, 11... Buoyancy tank, 1
3...Mooring rope A, 15...Mooring rope B

Claims (1)

[Claims] In a single-point mooring device for mooring a moored floating body via a mooring line, an underwater rotating table installed on the seabed surface, an underwater connecting rod hinged to the underwater rotating table, and a weight at the tip of the underwater connecting rod are supported. A single point mooring device comprising a buoyancy tank provided on the sea surface and a mooring line connecting the buoyancy tank or the underwater connection rod to the mooring floating body.