JPH0134834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mooring device for an intermediate buoy that is moored at a predetermined depth underwater.

For example, if conventional wave power generation devices are installed,
When connecting the floating body 2 floating on land with a cable 3, the floating body 2 is moored with a floating body mooring line 4 and a sinker (or anchor) 5, and the cable 3 is laid on the seabed 6 and placed near the floating body 2. Cable 3 is raised and connected to floating body 2. In this case, as the floating body 2 moves vertically and horizontally, the cable 3 also moves accordingly.
The bottom landing portion 3A is likely to be damaged by rubbing against the seabed 6. In order to avoid this, an intermediate buoy 7 is moored at a required position in the sea with an intermediate buoy mooring line 8 and a sinker (or anchor) 9, and a part of the rising part 3B of the cable 3 is supported by this intermediate buoy 7, and the cable is The rising part 3B of the floating body 3 is made to sag vertically in an S-shape, and the movement of the cable 3 due to the movement of the floating body 2 is absorbed by the slack part of the cable between the floating body 2 and the intermediate buoy 7, and the cable from the intermediate buoy 7 to the seabed is The cable section up to 6 is made so that it hardly moves.

If the floating body 2 is installed in a deep sea area, the intermediate buoy 7 will be moored at a deep underwater position, and even if a diver tries to pull the intermediate buoy 7 above the sea surface 1 for maintenance, it will be difficult for the diver to do so. The drawback was that it was not possible to carry out retrieval work in deep waters where it was impossible to dive.
Furthermore, if the intermediate buoy 7 is installed at a depth where a diver can dive, the intermediate buoy itself will be shaken by waves and ocean currents near the sea surface, and the bottom landing part 3A of the cable 3 will move. There is no point in providing it.

An object of the present invention is to provide an intermediate buoy mooring device that can easily raise and lower an intermediate buoy.

Hereinafter, an embodiment in which the intermediate buoy mooring device of the present invention is applied to an intermediate support device for a cable rising portion will be described in detail with reference to FIGS. 2 to 6. The intermediate buoy 7 has a structure in which a dome 11 is placed and fixed on the upper surface of a spherical floating body 10. Annular mooring cable fixing parts 12 are provided at four locations on the lower surface of the dome 11. In the dome 11 between the mooring cable fixing parts 12, pipes are fixedly passed through the dome 11 vertically and vertically in two places on the left and right, and mooring cable penetration parts 13 are provided in two places. An electromagnetic mooring cable fixing device 14 is provided in the middle of each mooring cable penetrating portion 13 . These mooring rope fixing devices 14 have, for example, wedges that are normally biased by springs, and use these wedges to fix the mooring ropes, which will be described later, in the mooring rope penetration part 13, and when the intermediate buoy 7 is raised or lowered, it is applied to the force of the spring. A structure in which the wedge is moved backward using an electromagnetic solenoid and the mooring line is free is used. A control cable 15 is connected to the mooring rope fixture 14 to enable remote control. In this embodiment, four intermediate buoy mooring cables 16 are used, and the base end of each mooring cable 16 is fixed to each mooring cable fixing part 12 of the intermediate buoy 7 one by one. On the seabed 6 at the mooring position of the intermediate buoy 7, sinkers (or anchors) 17 are installed on four sides, and each sinker 17 has a mooring line 16 like a pulley or ring.
A mooring cable moving mooring device 18 is provided to moor the mooring cable mooring moored in a U-turn state, and the corresponding mooring cable 16
It is moored so that it can move freely with the middle part of the ship making a U-turn. The distal ends of two adjacent mooring cables 16 pass through a common mooring cable penetration part 13 and are raised on the sea surface 1 side. Each mooring line 16 is normally fixed to the intermediate buoy 7 with a mooring line fixture 14 so as not to move.

A cable guide 19 is erected to cross the upper surface of the dome 11 of the intermediate buoy 7, and cable protection bend plates 20 are erected at both ends of the cable guide 19 in a figure-eight shape. The cable 3 is supported by being placed on the dome 11 between the cable guides 19. A cable connection box 21 is installed on the top of the dome 11 and fixed with a fixture 22.

Intermediate buoy mooring line 1 launched from intermediate buoy 7
The tip side of the buoy 6 is supported by an auxiliary buoy 23 installed above the intermediate buoy 7 at a depth where a diver can dive. The auxiliary buoy 23 has a mooring cable storage body 24,
It consists of a streamlined floating body 26 connected to this via a connecting member 25. The extra length of the intermediate buoy mooring cable 16 is stored in the mooring cable storage body 24, and the lid 2
It can be taken out by opening 7.
In addition, this mooring cable storage body 24 includes a control cable 1.
The tip side of No. 5 is also stored. Since the auxiliary buoy 23 is installed at a relatively shallow depth, it is affected by water currents or waves. Therefore, both the mooring cable storage body 24 and the floating body 26 are streamlined to prevent them from being subjected to abnormal rotation or being swept away by waves or water currents, and each floating body 26 is provided with directional stabilizing blades 28, so that they are always protected from ocean currents. I try to only face the direction. However, it is best to install this auxiliary buoy 23 above the sea surface 1 as much as possible; in that case, the auxiliary buoy 23 is
Structures such as 8 may be omitted.

Next, a method of pulling up such intermediate buoy 7 will be explained. A diver dives to the position of the auxiliary buoy 23, opens the lid 27 of the mooring cable storage body 24, pulls out the excess length of the intermediate buoy mooring cable 16 and the control cable 15, lifts it above the sea surface 1, and moors it to the crane of a work boat, etc. The cable 16 is attached, and the control cable 16 is connected to a control power source. When the control cable 16 is energized in such a state, the electromagnetic solenoid of the mooring rope fixing device 14 provided on the intermediate buoy 7 is energized, causing the wedge to retreat. As a result, the intermediate buoy mooring line 16 becomes free, and the force that tends to cause the intermediate buoy 7 to float can no longer be blocked, and the intermediate buoy 7 rises. As the intermediate buoy 7 rises, the extra length of the mooring line 16 is let out downward, and the mooring line 16 moves downward within the mooring line penetration part 13 of the intermediate buoy 7, and the mooring line moving mooring device 18 on the seabed 6 moves downward. A U-turn movement of the mooring line 16 is performed, and the length of the mooring line 16 between the intermediate buoy 7 and the mooring device 18 gradually increases, and the mooring line 16 is moved in a U-turn.
allow for an increase in Through such operations, the intermediate buoy 7 floats above the sea surface 1. When the intermediate buoy 7 is to be hidden, the tip end of the mooring line 16 may be pulled up to the sea side, contrary to the previous time. In this way, the length of the mooring rope 16 between the intermediate buoy 7 and the mooring device 18 is gradually shortened, and the intermediate buoy 7 is gradually hidden. When the required depth is reached, pulling up of the mooring line 16 is stopped and the control cable 15 is de-energized. Then, the electromagnetic solenoid of the mooring rope fixing device 14 is demagnetized, a wedge is driven in by the force of the spring, and the mooring rope 16 is locked. The auxiliary buoy 23 is lowered to the required depth, the excess lengths of the mooring cable 16 and the control cable 15 are stored in the mooring cable storage body 24, and the lid 27 is closed.

Next, a method of laying the cable 3 between the floating body 2 and the land will be explained with reference to FIGS. 7 to 12. As shown in FIG. 7, the cable 3 is laid on the seabed 6 by a laying ship 29. When the laying progresses to the vicinity of the floating body 2, the laying ship 29 is stopped, and as shown in FIG. The sinker 17 is suspended while being paid out by a crane 31 of a work boat 30, and the sinker 17 is fixed to the seabed 6. Next, as shown in FIG. 9, the proximal end of the mooring cable 16 is fixed to the intermediate buoy 7, and the distal end thereof is passed through the mooring cable penetration part 13 of the intermediate buoy 7 and pulled out above the intermediate buoy 7. . The junction box 21 of the cable 3 is fixed on the intermediate buoy 7. In such a state, the intermediate buoy 7 is moved by the crane 31 of the work boat 30.
It is suspended via the mooring rope 16. The mooring line 16 is loaded on the work boat 30. Next, as shown in FIG. gradually disappears into the sea. When the intermediate buoy 7 is submerged to the required depth, the control cable 15 is de-energized, the mooring rope fixing device 14 is activated, the mooring rope 16 is locked, and the intermediate buoy 7 is fixed. Next, the auxiliary buoy 23 is hidden as shown in FIG.
Store within 4. After that, the cable 3 installation work was restarted, and the tip of the cable 3 was connected to the wire 32,
33, the wire 33 is wound around the internal winch 34 of the floating body 2, and the cable 3 is drawn to the floating body 2. The tip of the cable 3 is connected to the floating body 2 as shown in FIG. 12, and the installation is completed. Note that 35 is a cable protection material. An example of the spacing or depth of each part as shown in FIG. 12 is as follows.

l ₁ = 900 m, l ₂ = 40 m, l ₃ = 500 m, l ₄ = 300 m.

In addition, in the above embodiment, an example was explained in which the intermediate buoy 7 was used as a support for the cable 3.
The use of the intermediate buoy 7 is not limited to this example. For example, it can be used as a support for various observation instruments such as underwater cameras.

In addition, in the above embodiment, the case where four intermediate buoy mooring lines were used was explained, but it is also possible to use five or more intermediate buoy mooring lines,
The present invention may be carried out even if there are only three intermediate buoy mooring lines, and if the intermediate buoy mooring line is passed through the center of the intermediate buoy and the base end of the intermediate buoy mooring line is fixed near the center of the lower surface of the intermediate buoy, the present invention can be carried out even if there is only one intermediate buoy mooring line. be able to.

As explained above, according to the intermediate buoy mooring device according to the present invention, the intermediate buoy can be easily moored at a depth where a diver cannot dive by using the intermediate buoy mooring line, and the intermediate buoy can be easily moored at a depth where a diver cannot dive. This intermediate buoy can be easily floated from that position. Furthermore, since the extra length of the intermediate buoy mooring cable is supported by the auxiliary buoy located above the intermediate buoy, the intermediate buoy mooring cable can be easily operated at a position above the intermediate buoy during the next operation. can.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional underwater cable rising part in a laid state, Fig. 2 is a side view of an underwater cable rising part in a laid state using the intermediate buoy mooring device of the present invention, and Fig. 3 is a side view of a laid state of an underwater cable rising part of the present invention. FIG. 4 is a perspective view showing an example of an intermediate buoy equipped with a buoy mooring device, FIG. 4 is a perspective view showing the mooring state of the intermediate buoy, and FIGS. 5 and 6 are views of the auxiliary buoy side of the intermediate buoy mooring device according to the present invention. The front view and side view of one embodiment, and FIGS. 7 to 12 are explanatory diagrams showing the process of laying the cable between the floating body and the land. DESCRIPTION OF SYMBOLS 1... Sea surface, 6... Intermediate buoy, 7... Intermediate buoy, 12... Mooring cable fixing part, 13... Mooring cable penetration part, 14... Mooring cable fixing device, 15... Control wire, 16... Intermediate buoy mooring line, 17... Sinker or anchor, 18... Mooring cable moving mooring device, 23
...Auxiliary buoy.

Claims (1)

[Claims] 1. An intermediate buoy mooring device for mooring an intermediate buoy at a required position underwater, including an intermediate buoy mooring line for mooring the intermediate buoy, and an intermediate buoy mooring line for fixing one end of the mooring line to the intermediate buoy. a mooring rope fixing part; a sinker or anchor installed on the seabed corresponding to the installation position of the intermediate buoy;
a mooring rope moving mooring device supported by the sinker or anchor and mooring the mooring rope movably by folding back a middle part of the mooring rope in a U-turn shape; and a mooring rope moving mooring device provided on the intermediate buoy and mooring a mooring cable penetrating portion through which the other end side of the mooring cable passes through the mooring cable; a mooring cable fixing device provided on the intermediate buoy for fixing the mooring cable to the intermediate buoy; and a mooring cable fixing device for fixing the mooring cable to the intermediate buoy. a control wire having one end connected to the mooring rope fixing device for controlling the mooring rope, and an auxiliary buoy positioned above the intermediate buoy to support the mooring rope and the other end side of the control wire. An intermediate buoy mooring device characterized by: