JPS5932580A - Draw leg type marine structure - Google Patents

Abstract

PURPOSE:To absorb the rolling and pitching caused by waves as well as to recover and utilize the wavy energy to the utmost, by connecting a damping device consisting of a gas sealed accumulator, an orifice, a hydraulic cylinder, a thermal energy takeout device, etc., to a leg of a draw leg type marine structure. CONSTITUTION:Using a leg 2 anchored to a sinker 1 at the sea bottom, a damping device 6 is installed in a moored draw leg type marine structure 3 via tie-bar 5. Plural numbers of the damping devices 6 are set up inside one column while each of them consists of a hydraulic cylinder 10, a gas sealed type accumulator 11 and an orifice 12, and installs a takeout device for energy produced in time of the absorption of rolling and pitching due to waves as thermal energy. The damping device absorbs said rolling and pitching in a marine structure due to waves, etc., and simultaneously recovers its absorbing energy as thermal energy and with the energy utilized in an effective way, an energy-saving aim can be thus promoted.

Description

[Detailed description of the invention] The present invention relates to tensile rigid marine structures.

The most basic structure of a tensile rigid marine structure is a plurality of columns 4 supporting a superstructure 3, as shown in the side view of FIG.
The superstructure 3 is stabilized and maintained in a horizontal position by balancing the buoyancy of the superstructure 3 with pre-tension applied in advance to the legs 2, which are anchored to the seabed with sinkers 1 at their lower ends. In the structure, leg 2 supports all the large external forces caused by waves, so the strength required of the leg is great.

Therefore, in order to reduce the strength required for the legs, a damping device consisting of a spring and a damper is provided at the connection part between the upper structure and the legs in the product currently being developed by the applicant company. We are trying to reduce the load related to this.

The effect of introducing a damping device has been determined theoretically and experimentally, but the problem when applying it to an actual machine is that the action of the damping device is to absorb external force energy, and this absorption The problem is that when energy is converted into heat, large-scale equipment is required to cool it.

The present invention was proposed in view of the above circumstances, and aims to provide an energy-saving tensile leg type marine structure that recovers and reuses the energy absorbed by the damping device, and is equipped with a damping device. The present invention is characterized by comprising a recovery device for external force energy absorbed by a damping device in a tensile rigid marine structure.

One embodiment of the present invention will be explained with reference to the drawings. Fig. 2 is a partially cutaway side view thereof, Fig. 3 is a mechanically equivalent model diagram of the damping device shown in Fig. 2, and Figs. FIG. 3 is an enlarged view of the damping device shown in FIG.

In the above figure, the same symbols as in FIG. 1 indicate the same members, and 5 is a tie bar that transmits the load movement of the leg 2 to the damping device 6.

A plurality of damping devices 6 are installed in one column 4, and each damping device is mechanically connected to a spring K as shown in FIG.
and a damper C element. 4 and 5 respectively show the specific structure of the damping device 6. In the figures, 10 is a hydraulic cylinder, 11 is a gas-filled accumulator, and both are connected by piping. 12 is an orifice provided in the middle of the piping, 13 is a hydraulic motor, 14 is a thermal energy extraction device, and 15 is a kinetic energy extraction device.

In such a device, the hydraulic cylinder 10, the accumulator 1"1, and the hydraulic oil sealed therein act on the spring by generating a reaction force in accordance with the displacement of the cylinder screw.

In other words, in Figure 2, external forces such as waves are applied to the ram 4.
When the column 4 is acted on, the column 4 moves up and down, and the displacement is the displacement of the piston of the hydraulic cylinder 10 9. The orifice 12 and the hydraulic motor 13 are damped by this vibration C.
give.

The energy absorbed at this time is converted into heat in FIG. 4 and into motion in FIG. 5, respectively, so the thermal energy extraction device 14. The kinetic energy extraction device 15 can recover these as useful energy, and at the same time,
An appropriate damper C can be constructed.

Normally, the energy absorbed by a damper is disposed of in a cooling device, etc., but with this device, energy can be recovered by
In short, according to the present invention, energy can be saved by eliminating the need for wasteful devices such as a cooling device.In particular, since the cooling device requires energy, this is a double energy saving.In short, according to the present invention, the damping device The present invention is industrially extremely useful because it provides a tensile rigid marine structure that saves energy by providing a device for recovering the external force energy absorbed by the damping device in the tensile rigid marine structure. It is.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing a known tensile rigid marine structure; FIG. 2 is a partially cutaway side view showing an embodiment of the present invention;
Figure 3 is a mechanically equivalent model diagram of the damping device in Figure 2.
5 and 5 are enlarged views of the damping device of FIG. 2, respectively. 1...Sinker, 2...Leg, 3...Superstructure, 4...
Column, 5... tie bar, 6... damping device.

Claims (1)

[Claims] 1. A tensile rigid marine structure equipped with a damping device, characterized in that the tensile rigid marine structure is equipped with a recovery device for external force energy absorbed by the damping device.