JP3344942B2 - Submarine cable recovery ship - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine cable recovery ship that enables efficient and safe recovery and removal of submarine cables.

[0002]

2. Description of the Related Art Conventionally, when a submarine cable laid on the seabed has deteriorated and needs to be replaced, for example, submarine cable collection work for withdrawing, collecting, and removing unnecessary submarine cables has been performed. ing. This collection operation has conventionally been performed as follows. That is, first, one end (cutting end) of a submarine cable is fixed in the sea with a wire, and the cable is pulled up from the sea to the sea while being pulled and lifted by a crane mounted on a recovery ship. Then, the lifted cable is loaded on the recovery ship, a stopper is attached to the cable remaining on the sea floor, the wire is replaced again (attached), and the cable is further lifted by a crane. In the past, such operations were repeated many times to lift, recover, and remove submarine cables.

[0003]

However, in such a conventional working method, a cable is lifted by a crane, and an operator can attach a stopper to the cable or change a wire under the cable. Since the work was being performed, there was a danger that the suspended cable would fall on the worker. In addition, in the conventional method as described above, it is necessary to repeat the cumbersome work such as loading the lifted cable on the recovery ship, attaching a stopper to the cable left in the sea, and changing the wire many times. And it was extremely inefficient. Therefore, in the conventional method, a large number of workers are required, and even if the operation results are obtained, it is limited that a 500 m cable can be collected in one day's collection operation.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has made the recovery work of submarine cables safe for workers, and has a more efficient, shorter construction time and lower cost. It is an object of the present invention to provide a submarine cable recovery ship which can be used as a submarine cable recovery ship.

[0005]

The submarine cable recovery ship according to the present invention for solving the above-mentioned problems in the prior art has a diameter of at least 4 m which is at least 20 times the diameter of the submarine cable. Have one submarine cable recovery
40-50kg handled by ship for submarine cable recovery
/ M submarine cable must be wound over 20,000m
A large drum that can be used to pull up the submarine cable on the seabed from the seafloor to the sea by its own rotation and wind the raised submarine cable around itself.
Move the submarine cable wrapped around you to the sea as it is
Submarine cable for sending and wrapped around itself
Only on board to lay the ship on the seabed by its own rotation.
The large-sized drum provided only with one '', the large-size drum for winding the raised submarine cable while pulling the submarine cable from the seabed to the sea, and laying the wound submarine cable on the seabed. to prevent the hydraulic motor for rotating the drum, said submarine cable in the course of the submarine cable is pulled by the rotation of the large drum is broken, the hydraulic
By adjusting the amount of hydraulic pressure supplied to the motor,
By adjusting the rotation speed, the rotation speed of the drum can be reduced.
And a rotation speed adjusting means for adjusting .

[0006]

[0007]

[0008]

Further, in the submarine cable recovery ship according to the present invention, the drum can be used for winding a new submarine cable in advance and laying it on the seabed, and the driving means such as the hydraulic motor includes: Preferably, it can also be used to rotate the drum to lay a new submarine cable pre-wound on the drum on the seabed.

[Detailed Description of the Invention] An embodiment of the present invention will be described below. 1 is a plan view showing a submarine cable recovery ship according to the present embodiment, FIG. 2 is a side view thereof, FIG. 3 is a perspective view thereof, and FIG. 4 is a front view thereof. In these figures, 1 is a recovery ship, 2 is a winding drum for winding and collecting the submarine cable mounted on the recovery ship, and 3 is a deteriorated submarine cable that is pulled up, wound up, and collected by the winding drum 2. Reference numeral 4 denotes a guide portion for properly guiding the submarine cable 3 raised to the sea in the direction of the winding drum 2. In FIGS. 1 to 4, other equipment (such as operating equipment) on the recovery boat 1 other than the part related to the winding drum 2 is not shown for convenience.

In the present invention, the diameter of the winding drum is formed to be at least 20 times (about 20 to 40 times) the diameter of the submarine cable to be wound. desirable. Because of the flexibility of submarine cables, the diameter of submarine cables is more than two.
If the drum is wound using a drum having a diameter smaller than 0 times, the submarine cable may be bent and broken beyond the allowable limit of flexibility. In the present embodiment, the winding drum 2 has a diameter of 4 m (or a diameter of 10 m).
I'm using Since the diameter of the submarine cable 3 to be usually wound is often 100 mm to 200 mm, a winding drum having a diameter of 40 times or more of that diameter is used. Further, according to the winding drum 2 of the present embodiment, the submarine cable 3 (40 to 50 kg / m) can be wound for 20,000 m or more.

FIG. 5 is a schematic block diagram for explaining a configuration of a hydraulic motor 5 for rotating and driving the winding drum 2 in the present embodiment. In FIG. 5, reference numeral 6 denotes a hydraulic tank (accumulator) for accumulating the hydraulic pressure, 7 denotes a hydraulic pump for sending the hydraulic pressure in the hydraulic tank 6 to the rotating unit 13, and 8 denotes an electric pump for driving the hydraulic pump 7. A motor 9 is a feed amount adjustment unit for adjusting the feed amount of the hydraulic pressure from the hydraulic pump 7 to adjust the rotation speed of the drum 2, and 10 is an adjustment lever for manually operating the feed amount adjustment unit. , 11 is a switching section (including a transmission gear) for switching the rotation speed and rotation direction (forward direction and reverse direction) of the rotating section 13, and 12 controls the electric motor 8, the switching section 11, and the like. Is a control panel operated by a worker for the purpose.

Next, the operation of this embodiment will be described. First, attach a wire to the cut end of the submarine cable to be collected. This work is performed on the sea floor. Next, by pulling up this wire to the sea by the rotation of the winding drum 2, the cable 3 attached to this wire is also pulled up. This raised cable 3
Is sent to the winding drum 2 while being guided by the guide portion 4, and is wound by the winding drum 2. Thereafter, by continuously winding the cable by the rotation of the winding drum 2, the collection operation is performed almost automatically.

If the rotation of the winding drum 3 is maintained at a constant speed during the winding operation, the submarine cable 3 may be broken. That is, for example, when there is an obstacle such as a rock pressing the cable 3 on the sea floor. In such a case, if the cable 3 is pulled up at a constant speed as it is, it will be broken,
It is necessary to adjust the lifting speed. For this purpose, in the present embodiment, the operator operates the adjusting lever 10 manually, for example, so that the feed amount adjusting unit 9 adjusts the amount of hydraulic pressure supplied by the hydraulic pump 7 so that the winding drum 2 It is possible to adjust the rotation speed.

In the course of the above-mentioned collection work, if the cable 3 is caught on a rock on the seabed on the seabed, it is necessary to rewind the cable 3 once and release the "caught". Therefore, in the present embodiment, the operator operates the control panel 12 to switch the rotation direction of the winding drum 2 once from the normal direction to the reverse direction, and to rotate the winding drum 2 slightly backward to rewind. ing. In the present embodiment, the driving force applied to the drum 2 is adjusted by engaging a gear attached to the rotating shaft of the hydraulic motor 5 with a gear formed on the outer peripheral portion 2a of the winding drum 2 (see FIG. 3). To make communication more efficient,
The rotational force of the drum 2 is increased.

As described above, in the recovery operation of the submarine cable 3 according to the present embodiment, after the winding by the winding drum 2 is started, the driving force of the hydraulic pump 5 and the rotation of the winding drum 2 substantially cause the operation. The cable is automatically pulled up, wound up, and collected, and the main task of the operator in this process is to monitor whether the winding up of the cable 3 by the winding drum 2 is performed smoothly and to monitor the cable 3.
(If the winding of the cable 3 is not performed smoothly in the course of the operation such as monitoring, the operator operates the adjusting lever 10 and the control panel 12 to operate the adjusting lever 10 and the control panel 12. The rotation speed of the winding drum 2 is adjusted, or the winding drum 3 is temporarily reversely rotated). Therefore, according to the present embodiment, the work can be efficiently performed by a small number of people as compared with the related art, and the collection work is significantly shortened.
The cost can be reduced (conventionally, collecting 500 m of cable per day was the limit, but according to the present embodiment, 1,500 mk of cable can be collected per day). Furthermore, since dangerous work under a cable hung by a crane as in the related art is not required, high safety of the work is ensured.

Further, in the present embodiment, as described above, the rotation speed of the winding drum 2 can be adjusted (shifted), so that it can be applied to a towing method or an anchoring method, and can be used on any route. It is.

[0018]

As described above, according to the submarine cable recovery ship of the present invention, after starting the lifting of the submarine cable to the sea by the drum, the cable is almost automatically retracted, wound and wound. In addition, since the collection is performed, the efficiency of the collection operation can be significantly improved and the construction period can be shortened as compared with the related art. In addition, the main work of the workers during this time is mainly light work such as monitoring the smooth lifting of the cable and winding of the raised cable. Can be achieved, and work efficiency and cost can be significantly reduced as compared with the related art. Furthermore, since it is not necessary to perform dangerous work under a cable hung by a crane as in the related art, it is possible to achieve high safety in cable recovery work.

Further, in the present invention, since the rotation speed of the drum at the time of pulling up the cable can be adjusted, even when the submarine cable is caught on something on the seabed, it is impossible to lift and recover the submarine cable. The problem that the submarine cable is cut / ruptured by pulling up and pulling up the cable does not occur. Also, by making it possible to adjust (shift) the rotational speed of the drum,
It can be applied to the towing method and the anchoring method, and can be used for all routes.

In the present invention, since the rotational force of the drum is supplied from a hydraulic motor, the diameter of the drum is 4 mm.
Even a large drum of m or more can be easily rotated.

Further, in the present invention, the winding drum may be used for laying a new cable on the seabed. That is, the new cable shipped from the manufacturing plant is wound on the pier at the winding drum of the recovery ship of the present invention, and then at sea while rotating the winding drum with a hydraulic pump (the winding drum of the present invention). Has a large diameter, so the winding drum cannot be rotated only by its own weight, but must be rotated by a hydraulic motor.)
The cable may be laid on the sea floor. In this way, the submarine cable recovery ship according to the present invention can be used for the work of laying cables on the seabed, the operation rate of the entire recovery ship can be improved, and the submarine cable recovery work can be improved. Further cost reduction can be achieved.

JP-B-59-53772 discloses "Vessel laying drum containing linear member". Japanese Patent Application Laid-Open No. 61-191218 discloses a method of laying a long body in water using a "drum around which a long body is wound". However, the drums disclosed in these two publications are merely for storing a new cable around the drum in advance and making it transportable (new cable storage / transportation means). As mentioned above, the "drum used to lift and recover unnecessary submarine cables from the seabed to the sea"
The operation and effect are completely different. The “drum” in the present invention includes “driving means such as a hydraulic motor for rotating the drum with a strong driving force” in order to achieve the purpose, operation, and effect of “pulling and collecting the deteriorated cable from the seabed”. However, such a configuration is not shown at all in the techniques disclosed in the above two publications.
Naturally, the technology disclosed in the above two publications is:
For the purpose of "laying cables", the drum is merely a "means for storing and transporting cables", and for laying cables, it is necessary to supply the cables to the sea, Due to the "weight of the cable", that is, the "gravity force", the cable sinks to the seabed. In particular, "the driving force / rotational force by the driving means (hydraulic pump) which is a component of the present invention" Is not necessary at all, and there is no such "idea" (rather, in the case of cable laying, to limit the speed at which the cable sinks under its own weight, the "brake to limit and brake the rotation of the drum" Is important, and the above publication also discloses the configuration of the brake.) From the above, the disclosed technology of the above two publications cannot deny the inventive step of the present invention. And it is clear.

[Brief description of the drawings]

FIG. 1 is a plan view showing a submarine cable recovery ship according to an embodiment of the present invention.

FIG. 2 is a side view showing the submarine cable recovery ship according to the present embodiment.

FIG. 3 is a perspective view showing the submarine cable recovery ship according to the present embodiment.

FIG. 4 is a front view showing the submarine cable recovery ship according to the present embodiment.

FIG. 5 is a schematic block diagram for explaining a configuration of a hydraulic motor used in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Collection ship 2 Take-up drum 3 Guide part 5 Hydraulic motor 6 Hydraulic tank 7 Hydraulic pump 8 Electric motor 9 Feed amount adjustment part 10 Adjustment lever 11 Switching part 12 Control panel

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-126120 (JP, A) JP-A-60-192184 (JP, A) Registered utility model 3052968 (JP, U) JP-B-59-53772 JP, B2) JP-B 64-309 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 1/10

Claims (1)

(57) [Claims] 1. A has a 4m or more diameter is the dimension of 20 times the diameter of the "submarine cable, a seabed Ke
Cable recovery vessel handles for submarine cable recovery 40
Up to 20,000m of submarine cable of 50kg / m
A large drum, "which can be wound in et al., For taking up the salvage undersea cable to himself while hoisting a submarine cable in the" submarine from the seabed to the sea due to its own rotation, submarine wound on himself Cable
For sea transport as it is and wrapped around itself
Laying the submarine cable on the seabed by its own rotation
Eyes, and a large drum "provided by only one on board, the submarine cable to wind the hoisting submarine cable while pulled from the seabed to the sea, and, laying the wrapped submarine cables to the seabed for,
A hydraulic motor for rotating and driving the large-sized drum; and adjusting an amount of hydraulic pressure supplied to the hydraulic motor to prevent the submarine cable from being broken during the process of lifting the submarine cable by rotation of the large-sized drum. do it
By adjusting the rotation speed of the hydraulic motor,
A submarine cable recovery ship, comprising: a rotation speed adjusting means for adjusting the rotation speed of the ram .