JPS6362970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the method of laying submarine cables and water pipes on the seabed.

Submarine cables are heavy and require a large braking device when being lowered to the seabed from a laying ship or work boat.

On the other hand, submarine water pipes have a low apparent specific gravity, so they may float in seawater, and even if they do sink, the sinking speed is too low, so they are easily affected by tidal currents.
Therefore, it was necessary to take measures such as adding water to increase the specific gravity.

On the other hand, in most remote islands, electricity and drinking water are both required. Therefore, it is clear that carrying out both power transmission and water transmission work, that is, laying power cables and water pipes at once rather than separately, would be of great benefit to remote islands and to construction companies.

The present invention has been made in consideration of the above circumstances, and provides a method for simultaneously laying submarine cables and water transmission pipes that are lighter than water. The purpose is to wrap it around water pipes and tie it all together for installation.

The installation method of the present invention will be explained using the drawings. In Figure 1, 1 is the sea surface, 2 is the seabed, 3 is a laying ship, 4 is a coiled cable, 5 is a coiled water pipe, 6 is a caterpillar, 7 is a lashing machine, cable 41, A water tube 51 is pulled out from each coil using a caterpillar 6, and after passing through the caterpillar, the lashing wire 8 is connected to the cable 4 when passing through a lashing machine 7.
1 and the water pipe 51 to bind them together and sink to the seabed 2 for installation.

An example of the above lashing machine is shown in FIG. In the figure, 11 is a cable 41 and a water pipe 51
13 is a stand having a hole 12 through which it passes, an inner cylinder 13 is cantilevered on the stand 11 in a concentric relationship with the hole 12, and an outer cylinder 14 is rotatably supported on the outer periphery of the inner cylinder 13 via a bearing 15. , 16 is the inner cylinder 13
17 is a movable bevel gear meshed with the bevel gear 16; 18 is a shaft rotatably supporting the bevel gear 17 on the outer cylinder 14; 19; is a pulley that is integrally fixed to the bevel gear 17 with a common shaft 18;
A bobbin 20 is rotatably supported by the outer cylinder 14 through a shaft 21. A lashing wire 8 is wound around this bobbin 20. 22 has an outer cylinder 14 at one end.
A bracket 23 is supported by the bracket 22 and has a tip protruding forward from the tip of the outer cylinder 14.
This is a guide roller rotatably supported by a shaft 24 at the tip of the guide roller. After coming out of the bobbin 20, the lashing wire 8 is wound around the pulley 19, and then passes through the guide roller 23 to the cable 4.
1. It is designed to be supplied to the water pipe 51.

In such a lashing machine 7, the tip of the lashing wire 8 is fixed to the cable 41 and the water pipe 51, and when both are taken off for wire extension, the lashing wire 8 is also taken off. Become. When the lashing wire 8 is taken off, the pulley 19 around which the lashing wire 8 is wound rotates, causing the movable bevel gear 17 to rotate. When the movable gear 17 rotates, this gear 17 is meshed with the fixed gear 16, so
The outer cylinder 14 goes around the outer periphery of the water pipe 51 and the cable 41 in the direction of the arrow, and the lashing wire 8 is wound around the outer periphery of the cable 41 and the water pipe 51 as shown in the figure to bind them together.

The advantages of the method of the present invention are that cables that are heavier than water and water pipes that are lighter than water are bundled together and laid, so (1) compared to the conventional method, the brake device during installation can be smaller.

(2) There is no need to add weights to the water pipes as in the conventional method.

(3) Since power transmission and water transmission works are carried out simultaneously, construction costs can be much lower than if they were carried out separately.

etc.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of the laying method of the present invention, and FIG. 2 is a partially cutaway side view showing an example of the lashing machine used in FIG. 1. 1...sea surface, 2...undersea, 3...laying ship, 4...
...Cable with coil removed, 41... Cable, 5... Water pipe with coil removed, 51... Water pipe, 6... Caterpillar, 7... Lashing machine, 8... Lashing wire.

Claims (1)

[Claims] 1. Pull out the coiled cables and water pipes, which are lighter than water, from the installation ship, wrap the cables and the water pipes together with lashing wire using a lashing machine, bundle them, and let them sink into the sea, where they will be laid on the seabed. A method for laying submarine cables and water pipes, characterized by: