JPS5850483B2 - Method and device for burying long objects under the sea - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for burying elongated objects such as submarine cables and water pipes in the seabed.

If a long body is laid on the seabed in an anchoring area such as a fishing area, the long body may be damaged by the anchor or fishing gear as it is dragged along the seabed. .

To avoid this, long bodies are usually buried under the seabed.

There is a method of burying a long body, which is called the post-burying method, in which the long body is laid on the seabed in advance, and then a burying machine is run along the long body on the seabed to bury it. .

However, in the case of the post-burying method, a metal detector or the like is used to detect the long body in order to run the burying machine along the long body laid on the seabed.

Since the burying machine was controlled by signals from the metal detection device to make it follow the long object, the guidance mechanism was complicated and the guidance was troublesome.

Further, in the case of the conventional post-burying method, there was a drawback that the burying machine had to be towed by a towing boat.

An object of the present invention is to provide a method and apparatus for burying an elongate object under the sea, which can easily guide a burying machine along the elongate object and can run the object without requiring a towing vessel.

Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

First, the installation of the elongated body 1, which is carried out prior to carrying out the method of the present invention, will be explained with reference to FIGS. 1 to 3.

While towing the laying ship 2 along the laying route with a tugboat 1, a long body 3 is let out from the laying ship 2 and laid on the seabed 4.

At this time, a pair of guide ropes 5 made of wires or wires are simultaneously attached from both sides of the laying vessel 2 and letting out the long body 3.
5' is also let out together, and these guide cables 5, 5' are laid on both sides of the long body 3 laid on the seabed 4, as shown in FIG.

When the installation is completed, the ends of each guide cable 5, 5' are fixed to the seabed with anchors 6, 6', etc.

FIG. 4 and FIG. 5 show a specific example of the method and apparatus for burying a long object under the sea according to the present invention.

The elongated submarine buried device 7 used in this embodiment is equipped with a jet-type excavation part 9 for excavating the seabed 4 at the lower center of a twin-hulled boat-shaped burial body 8 that runs on the seabed 4.
In order to guide the elongated body 3 into a groove 10 dug in the seabed 4 by the method, the buried body 8 is provided with a long body guiding path 11 in the center that descends from the front toward the rear.

Pressurized seawater is supplied to each jet nozzle 12 of the jet excavation section 9 from a submersible pump 13 mounted on the buried body 8.

On both sides of the buried fuselage 8, cable conductors 14, 14' for guiding respective guide ropes 5, 5' onto the fuselage 8 are provided at the front and rear.

A drag drive machine 15 is mounted on the burial body 8 to make the elongated submarine burial device 7 self-propelled while tracing the guide ropes 5, 5'.

This tug 9 drive machine 15 includes a pair of tug wheels 16 and 16' for winding and pulling each guide rope 5, 5' together, and each rotating shaft 17 of these tug wheels 16 and 16'. 1γ, and a rotary drive source 19 such as a motor or engine that rotates each of the collecting wheels 16 and 16'.

Further, an operating unit (20, 20') is provided on the buried fuselage 8, and if necessary, when operating the dialer 21, a brake is applied to the rotation of one of the nine wheels (15, 15') of the device (7). can now be operated by a man.

However, in the present invention, when the Tag9 drive machine 15 is driven,
Both guide ropes 16, 16' are rotated, and the guide ropes 5,
The device 7 moves by itself along the elongated body 3 while traversing the length 5'.

In addition, the jet excavation part 9 is activated by the operation of the submersible pump 13.
A water jet is ejected from the bottom to excavate a groove 10 in the seabed 4, and the long body 3 is inserted into the groove 10 from the long body guiding path 11.
is drawn out and buried.

In the above embodiment, the excavating section 9 is of a jet type, but the present invention is not limited thereto, and can be similarly applied to a dynamic excavating section.

As explained above, in the method for burying a long body under the sea according to the present invention, the burying device is guided by the guide ropes laid on both sides of the long body, so there is no need to use a complicated guiding mechanism. The implantation device can be guided along the elongate body.

On the other hand, the device for burying a long body under the sea according to the present invention moves by itself while pulling together the guide ropes laid on both sides of the long body, so burying work can be performed without the need for a towing vessel. I can do it.

[Brief explanation of the drawing]

1 and 2 are a side view and a plain view showing the installation state of the elongate body and the guide cable, FIG. 3 is a plan view showing the installation state of the elongate body and the guide cable, and FIGS. FIG. 5 is a plan view and a side view showing an example of an embedding device for carrying out the method of the present invention. 3... Long body, 4... Seabed, 5.5' guide rope, 6
゜6'... Anchor, 7... Buried device, 8... Buried aircraft body, 9... Excavation part, 10... Groove, 11... Long body guideway, 15... Guji drive machine.

Claims (1)

[Scope of Claims] 1. A long body characterized in that the long body is buried by running a long body submarine burying device guided by guide ropes laid on both sides of the long body on the seabed. Method of burying the body under the sea. 2. A buried aircraft body equipped with an excavation section, a long body guideway, etc. is equipped with a tug drive machine that allows the buried body to move by itself while pulling together guide ropes laid on both sides of the long body on the seabed. A long-body submarine buried device characterized by: