JPH05168118A - Submarine laying and burying method for long object - Google Patents

Abstract

PURPOSE:To provide a submarine laying and burying method for long object in which various problems can be solved readily. CONSTITUTION:The submarine laying and burying method of long object comprises a laying vessel 1, a burying vessel 2 coupled with the laying vessel 1 through a coupling rope 3 to follow after the laying vessel 1, and a burying machine 8 being dragged by the burying vessel 2 through a dragging rope 9 to bury a long object 4 in the ocean bed 7. Feed out of the long object 4 is controlled through a feed out machine 6 installed on the laying vessel 1. The burying machine 8 buries the long object 4 while being controlled by the burying vessel 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elongated seabed laying method for laying a long body such as a submarine cable, a seabed water pipe, and a seabed oil feed pipe on the seabed.

[0002]

2. Description of the Related Art Conventionally, there have been the following two methods for laying a long body in the seabed. (A) The long body is buried while being laid by an burying machine.

(B) The long body is once laid on the seabed over the entire length, and then buried in the seabed with an embedding machine.

[0004]

[Problems to be Solved by the Invention] However, (A)
In this method, the laying control of the long body and the control of the burying machine are performed on the same ship, so the control of the laying and the control of the burying work interfere, the control does not work well, and the rupture of the long body due to excessive tension Alternatively, there is a problem in that troubles such as excessive bending and kinking at the entrance of the burying machine are likely to occur due to excessive looseness of the long body.

In the method (B), once the entire length of the long body is installed (laying) on the seabed, the buried machine moving while tracing this causes troubles such as excessive bending and kink of the long body due to excessive looseness. There was a problem that was likely to occur.

An object of the present invention is to provide a method for laying a seabed in a long body which can easily solve various problems in laying and burying a long body.

[0007]

Means for Solving the Problem To explain the means of the present invention for achieving the above object, a method for laying a long seabed in a seabed according to the present invention comprises a laying ship and a connecting rope connected to the laying ship. Using a buried ship to be tracked and an embedding machine that is towed by a tow wire on the buried ship to embed a long body on the seabed, and control the feeding of the long body with a feeding machine of the laying ship to carry out the embedding. The long body is embedded by the embedding machine while controlling the embedding machine by a ship.

[0008]

As described above, when the laying ship controls the laying of the long body and the burial ship controls the undersea burial machine, the laying and the burial can be controlled at positions where they do not interfere with each other. ..

[0009] Also, since the entire length of the long body is once laid on the seabed and then buried by a tracing burying machine, the long body is laid on the seabed and buried by the burying machine. When the slack is generated, the slack of the long body can be eliminated by controlling the tension of the long body by the feeding machine of the preceding laying ship.

Further, when the burial machine hits an obstacle such as rock and cannot be towed by the force of the burial ship alone, the burial machine is towed by both the laying ship and the burial ship.
The buried machine can be escaped from the location of the obstacle.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a long seabed burying apparatus for carrying out the long seabed burying method according to the present invention. A laying ship 1 with a length of 50 m and a width of 20 m equipped with a ship, for example 1500
An 80 mm long and 15 m wide buried ship 2 equipped with a ton barge was used. The buried ship 2 is connected to the laying ship 1 via the connecting rope 3. On the laying ship 1, 6.6 KV as a long body to be laid
A submarine power cable (outer diameter 80 m, aerial weight 16 Kg / m) 4 was coiled and loaded. Further, on the laying ship 1, a laying control device 5 and an endless track type feeding machine 6 having a traction force of 5 tons were installed. A chain cutter type burying machine 8 is arranged on the seabed 7 behind the burial vessel 2. In this chain cutter type burying machine 8, the burying ship 2 is towed by the tow wire 9. The length of the pulling wire 9 is, for example, 10 m to 100 m.
The length of. A power supply device, a control device, a hydraulic device, a water pump, etc. are loaded on the buried ship 2, and a chain cutter type burying machine 8 is provided by cables and hoses 10 such as a power cable, a signal cable, a hydraulic hose, and a water hose.
To control.

Next, an example of a method for burying a seabed in a long body by such a seabed laying apparatus for a long body will be described.

In this embodiment, the long-length body 4 is laid on the seabed 7 while controlling the feeding of the long body 4 while applying a brake by the endless track type feeding machine 6 of the laying ship 1.

On the other hand, in the buried ship 2, the loaded power supply device,
The chain cutter type embedding machine 8 is controlled by a control device, a hydraulic device, a water pump, etc., while controlling the chain cutter type embedding machine 8 via cables / hoses 10 such as a power cable, a signal cable, a hydraulic hose, and a water supply hose. Then, the long body 4 on the seabed 7 is buried under the seabed 7 at a depth of 4 m, for example.

In this way, when the laying ship 1 controls the laying of the elongated body 4 and the burying ship 2 controls the burying machine 8 on the seabed 7, the laying and the burying control are performed at positions where they do not interfere with each other. Each can be done.

Further, instead of laying the entire length of the elongated body 4 on the seabed 7 and then burying it with the tracing burying machine 8,
Since the long body 4 is laid on the seabed 7 and buried by the embedding machine 8, when the long body 4 is loosened on the seabed 7, the long body 4 is fed by the feeding machine 6 of the preceding laying ship 1. By controlling the tension of the elongated body 4, it is possible to eliminate the looseness of the elongated body 4.

Further, when the burial machine 8 hits an obstacle such as a bedrock and the burial machine 2 cannot be towed only by the force of the burial ship 2, the burial machine 8 is towed by both the laying ship 1 and the burial ship 2. This allows the burying machine 8 to escape from the location of the obstacle.

In such laying and burying operations, if the length of the connecting rope 3 of the burial vessel 2 is made variable, control according to changes in water depth and the long body 4 of the unburied portion laid on the seabed 7 are performed. It is possible to control the tension and bending of the.

It is needless to say that the burying machine 8 may be of another type, such as a plow type, a water jet type, or a combination type of these types.

[0020]

As described above, in the method of laying a long seabed according to the present invention, the laying ship controls the laying of the long seabed, and the burial ship controls the seabed burying machine. The installation and burial can be controlled at positions where they do not interfere with each other. Also, instead of laying the entire length of the long body on the seabed once and then burying it with a tracing burying machine, since the long body is laid on the seabed and buried by the burying machine, the long body is laid on the seabed. When looseness occurs, the loosening of the long body can be eliminated by controlling the tension of the long body by the feeding machine of the preceding laying ship. Furthermore, when the burial machine hits an obstacle such as bedrock and the burial machine cannot be towed only by the force of the burial ship, the burial machine is towed by both the laying ship and the burial ship to prevent the burial machine from obstructing. You can easily escape from the place.

[Brief description of drawings]

FIG. 1 is a side view showing an example of an implementation state of a method for embedding a long body undersea according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Laying ship, 2 ... Buried ship, 3 ... Connection line, 4 ... Submarine power cable (long body), 5 ... Laying control device, 6 ... Endless track type feeding machine, 7 ... Submarine, 8 ... Chain cutter type buried Machine,
9 ... Towing wire, 10 ... Cables and hoses.

Claims (1)

[Claims] 1. A laying vessel, an burying vessel which is connected to the laying vessel by a connecting line for tracking, and an burying machine which is towed by a traction wire to the burying vessel to bury a long body on the seabed. Submersible laying of a long body characterized by controlling the feeding of the long body with a feeding machine of a laying ship, and burying the long body with the burying machine while controlling the burying machine with the burying ship Method.