JPS59170316A - One-point mooring type marine structure - Google Patents

Abstract

PURPOSE:To lessen the force of mooring by mooring a structure consisting of a deck, a column connected to the deck, and floats having an omnidirectional thruster on its lower part, provided to the lower end of the column at one point of a base laid on the seabed. CONSTITUTION:A marine structure A consists of a deck 1, several columns 2 connected to the deck 1, floats 3 attached to the lower end of the columns 2, and omnidirectional thrusters 4 attached to the lower parts of the floats 3. A one-point mooring device B consists of a yoke 6 attached by a hinge 5 to one end of the deck 1, a swivel 8 to attach the other end of the yoke 6 to a mooring float 7, and an anchor leg 11 connecting a base 10 laid on the seabed 9 with the mooring float 7. The direction of the thruster 4 is determined according to displacement due to external force to the structure A and operated and the force of the thruster is made to coincide with the external force to vary the force of mooring, thereby lessening the force of mooring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-point moored offshore structure, and more particularly, to a single-point moored offshore structure that reduces the mooring force of relatively large offshore structures such as marine airports. be.

Floating structures on the sea are generally constructed as box-shaped so-called pontoons, but such structures are subject to external forces such as wind waves and tidal currents when moored, which requires a strong mooring device, resulting in high equipment costs. Become.

For this reason, it is conceivable to connect a deck located on the sea to a plurality of submerged buoyant bodies through columns, and to moor the deck at one point so that it can turn. However, even with such a structure, it is not possible to sufficiently reduce the mooring force.In other words, the external forces that act on such offshore structures can be broadly classified into wind waves and tidal currents, but these generally do not act in the same direction. . Therefore, the mooring force in this case is the reaction force F4 of the resultant force F3 of the force F1 due to wind and waves and the force F2 due to the tidal current, as shown in Fig. 3 (→). As a result,
The present invention has been accomplished.

That is, it consists of a deck located on the sea, a plurality of columns, a buoyancy body installed at the bottom end of each column, and an omnidirectional thruster installed at the bottom of the buoyancy body, and the deck is laid on the seabed. It was designed as a single-point mooring offshore structure that was moored at one point on Pace.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a single-point mooring type offshore structure according to the present invention will be described below based on the drawings.

In Figures 1 and 2, offshore structure A is deck 1.
It is composed of a plurality of columns 2 connected to the deck 1, a buoyancy body 6 attached to the lower end of the column 2, and an omnidirectional thruster 4 provided at the bottom of the buoyancy body 3. On the other hand, B is a one-point mooring device, which includes a yoke 6 fixed to one end of the deck 1 by a hinge 5, a swivel 8 that attaches the other end of the yoke 5 to a mooring buoy 7, and a base 10 laid on the seabed 9. and an anchor leg 11 that connects the mooring buoy 7.

12 is a flexible joint.

In such a configuration, as shown in FIG. 3(b), the offshore structure A is subjected to an external force F due to wind and waves, / and an external force F due to tidal currents. If this occurs, a detection device (not shown) detects the displacement θ, determines the direction of the omnidirectional thruster 4, and activates it. The thrust force F5 of this omnidirectional thruster 4 is the external force F! caused by the tidal current! When it matches, the mooring force F7 changes to p7J, and the mooring force can be reduced.

Of course, the purpose of the present invention is to reduce the mooring force of a single-point moored offshore structure, but the present invention is also effective when applied to, for example, a marine airport. That is, it is preferable that airplanes take off and land in the direction of the wind. , By the way, King Brother 3 (C)
As shown in , when an external force F due to wind and waves and an external force due to a tidal current are acting on the offshore structure A, the offshore structure A is located in the direction of the resultant force Fr. Therefore, by operating the omnidirectional thruster 4 to turn the marine structure A so that it is leeward from a mooring point (not shown), the airplane can easily take off and land.

As explained above, according to the single point mooring type offshore structure of the present invention, the mooring force can be reduced, which not only reduces equipment costs, but also makes it extremely advantageous for aircraft takeoff and landing when used at a marine airport. It has advantages such as:

Of course, the present invention is not limited to the embodiments described above, and it is obvious that various changes can be made without departing from the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of the one-point moored offshore structure of the present invention, FIG. 2 is a plan view thereof, and FIGS. 1...Deck, 2...Column, 3 Buoyant body, 4...
・Omnidirectional thruster, 5...hinge, 6...yoke,
7... Mooring buoy, 8... Swivel, 9... Seabed, 1
o...base, 11t...g to anchor, 12...
・Flexible hand. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] 8. A deck located on the sea, a plurality of columns, a buoyant body provided at the lower end of each column, and a lower part of the buoyant body. A single-point mooring type offshore structure consisting of an omnidirectional thruster and mooring the deck at a single point to a base laid on the seabed. −