JPH0995295A - Device for inspection and replacing accessory of underwater structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely perform the work for fitting, inspection and replacement accessories from the inside of a vessel without submerging. SOLUTION: An opening part 2 is provided in an outer plate 1 of an underwater structure A under the water surface, and a cover 4, to which an anode electrode 5 is to be fitted outside of the vessel, is fixed to the opening part 2 from the inside of the vessel freely to be disconnected. A water-tight glove 6, in which the water can be supplied and from which the water can be drained, is provided inside of the vessel freely to be connected and disconnected to/from the outer plate 1 in the periphery of the opening part 2. This box 6 is provided with a substitutional cover, which covers the opening part 4 in a place of the cover 4 and which can be fitted to the opening part freely to be disconnected, and a box wrench type working hand 11 and a parallel moving working hand as a means for replacing the cover 4 with the substitutional cover.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a ship, an oil storage ship,
In floating structures such as floating barges, floating rigs, floating airports, underwater observation towers, pier caisson, and tanks, where the inside or one side is hollow and the outside plate or the other side is in contact with water, seawater or corrosive liquid, TECHNICAL FIELD The present invention relates to an accessory inspection / replacement device for an underwater structure, which is used for attaching, inspecting, repairing, or replacing accessories such as an anticorrosion electrode and an observation window, which are attached below the water surface of an outer plate.

[0002]

2. Description of the Related Art Corrosion protection measures such as steel revetments, pier caisson, underwater observation towers, oil drilling rigs, etc., represented by stationary offshore structures, are generally impossible due to the inability to move the structure for maintenance. Due to its long life, it has a long maintenance period and is heavy corrosion resistant. In addition to conventional coating corrosion protection, galvanic anodic corrosion protection or external power supply corrosion protection methods have been adopted there. When inspecting these anticorrosion conditions and sometimes repairing or replacing the anticorrosion electrodes, most of them have to be done underwater. It is a special work performed by a specialized diving worker, who wears diving suits, performs underwater welding and underwater gas cutting, and remodels the facility and replaces the anticorrosion electrodes.

Even if it is a stationary type, the tank on land is small in scale, and if the contents are temporarily moved, the inside can be inspected and repaired easily. However, at present, when it is necessary to inspect, repair or replace the contents without moving the contents of a large onshore tank structure such as an aquarium in the coastal area, diving work is also performed.

Next, movable offshore structures, that is, oil storage vessels, floating barges, floating rigs, floating marine airports, and the like, are becoming larger and are being moored in combination with other facilities. However, it becomes difficult to move for maintenance. Therefore, even if the initial anti-corrosion measure can be done with the dock at the time of construction, it is more cost-effective to inspect and replace the facility afterwards by performing undersea work on site.

Finally, in the case of a ship which is a sea-moving structure,
Due to the advantage of regular dock repairs, we do not rely on underwater work except in special cases. In the case of a ship, it is almost impossible to carry out outboard work while moving, and it is common for the diving operator to carry out local inspections at the time of mooring, and full-scale inspections, repairs and replacements are carried out at the dock stage. .

[0006]

When attempting to perform diving work without relying on the dock for outboard work, the problem is that there are too many restrictions for the necessary workers to work freely at any time. is there. Diving work cannot be performed without diving qualifications and the surrounding diving support system. In addition, underwater work is very different from the atmosphere, and there is a great risk of water pressure, temperature, tidal current, pests, electric shock, etc., and the freedom of wearing diving suits is greatly limited. Also, since various types of work are not handled by specialized workers, but are entrusted to diving qualified personnel, the skill level and reliability of work are low despite the high labor unit price,
There are many unsolved problems in inspection and repair, so
It is said that underwater inspection, repair, or replacement devices for offshore structures are still in the research stage, although some have been put to practical use. Also, diving work is hard work, and despite the difficulty of successors, the number of workplaces that need it is increasing.

On the other hand, a method shown in FIG. 4 is conceivable in which a dangerous diving operation is indirectly operated by an unmanned device such as an underwater boat or a robot, not directly by a person. That is,
In the floating marine structure 41, the underwater camera robot 42 is lowered into the water and operated from the inside of the ship to record / analyze the state of the bottom of the ship and perform underwater work.

[0008] However, in this method, since the guidance, investigation, and work to the problem area outside the ship are indirectly instructed by using various signal transmission means such as wired, wireless, optical, and ultrasonic waves, confirmation instruction is given. Since it is not possible to put sufficient information on data such as video and audio, there are always problems of signal responsiveness and noise. Further, underwater has a narrow field of view, the light does not easily reach, and is easily scattered, and the seawater is agitated by the movement of the submarine or the robot, the floating matter on the sea floor is rolled up, and the visibility is further deteriorated. There is a problem that work by is difficult. In addition, positioning is difficult and unstable due to waves and tides. Therefore, mechanical work such as welding by a robot or screw tightening that requires high precision is currently impossible underwater. In addition, the equipment is expensive and does not have an economical base such as maintenance costs.

Next, a temporary chamber is provided in a part of the outer plate of the offshore structure to secure a continuous passage from the sea, and a worker descends inside the passage to reach the work place, or dive into the underwater chamber. Then, the method shown in FIG. 5 for working inside can be considered. That is, in the floating offshore structure 41,
The submersible chamber 43 is fixed to the bottom of the ship by the buoyancy force by the buoyant body 44 and the compressed air sent into the air space 45, the compressed air is sent into the chamber 43, and is discharged from the chamber 43. It is to go inside and perform the inspection and replacement work of the anode electrode 47.

However, the former method is limited to the work near the sea surface, and the latter method has a problem that no one can work because it dives once. Therefore, an object of the present invention is to provide an inspection / replacement device for an underwater structure, which enables a worker to securely and securely carry out installation, inspection, repair or replacement work of the accessory without diving. It was done.

[0011]

In order to achieve the above-mentioned object, the inspection / replacement device for an accelerator of an underwater structure according to claim 1 of the present invention is applied to an outer plate below the water surface of the underwater structure. An opening is provided, a cover for attaching an accessory to the outside of the ship is fixed to the opening so as to be removable from the inside of the ship, and a watertight glove box capable of water supply and drainage is detachably provided on the outer plate of the opening outer circumference on the inside of the ship. It is characterized in that the glove box is provided with an alternative cover which covers the opening instead of the cover and which is attachable to and removable from the opening, and means for replacing the cover and the alternative cover.

The accessories include an anode electrode, a reference electrode, an ultrasonic transmitter / receiver, a light source, a camera and the like. According to the above configuration, the accessory can be attached, or inspected or replaced according to the following procedure.

The glove box is attached to the opening, and then the cover is removed by the replacement means to be housed in the box. At this time, the water fills the glove box,
It does not leak outside. Next, by the replacement means, the alternative cover is attached to the opening to stop water, then drained, and the box is removed. Then, the cover can be taken out into the atmosphere, and accessories can be attached or inspection / replacement work can be performed. After the work is completed, the cover is housed in the box, the glove box is attached to the opening, and then the replacement cover is removed by the replacement means and housed in the box, and then the cover is attached to the opening to stop water. Next, drain the inside of the box and remove the box from the opening.

The inspection / replacement device for an underwater structure accessory according to claim 2 is the inspection / replacement device for an underwater structure accessory according to claim 1, wherein an alternative cover can be attached to the accessory. It is characterized by having done.

According to the above structure, when the accessory to be replaced is attached to the replacement cover in advance, the accessory replacement work is completed by replacing the cover and the replacement cover.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a sectional view and a front view of an inspection / replacement device for an underwater structure and its accessories according to an embodiment of the present invention.

In the underwater structure A, openings 2 are provided in an outer plate 1 below the water surface of the underwater structure. The openings 2 are provided on the inside of the ship along the outer circumference of the openings 2 and have eight openings. A stud bolt 3A is erected, and a blind flange cover 4 with packing is detachably fixed to the opening 2 from the inside of the ship by a nut 3B using the stud bolt 3A. An anode electrode 5 is attached as an accessory to the outside (water B) side of the cover 4.

A watertight glove box 6 is attached as an inspection and replacement device for the anode electrode 5. The glove box 6 is a box-shaped transparent acrylic water-tight box that has three times or more openings as the cover 4, and is provided with a flange 7 at the edge of the glove box 6. There is. Further, a stud bolt 9A is provided so as to face the attachment hole 8 formed in the flange 7 and center around the opening 2. The glove box 6 is configured such that the stud bolt 9A is inserted into the attachment hole 8 and the nut 9B is used. It is detachably fixed to the outer plate 1.

In the glove box 6, a cover 4 is provided.
Instead, an alternative cover 10 that covers the opening 2 and is attachable to the eight studs 3A in the opening 2 is provided, and the outer surface of the glove box 6 faces each of the eight studs 3A. Box wrench type working hand 11 is further provided, the working hands 12 for parallel movement of the cover 4 or the alternative cover 10 are provided on both side surfaces, the air supply valve 13 is provided on the upper surface, and the drainage is provided on the lower surface. A valve 14 is provided.

As shown in FIG. 3, the box wrench type working hand 11 has a box wrench 16 with a magnet 15 attached to its tip and a handle 17 attached to its rear end. It has a seal structure 18, and is supported by the glove box 6 via the seal structure 18 so as to be movable in the front-rear direction (direction of the opening 2) and rotatable.

A work procedure when the anode electrode 5 is replaced by the structure of the inspection and replacement device will be described. 1. As shown in FIG. 1, replace the glove box 6 with the nut 9
Attach the cover 4 to the inside of the ship by B. It is assumed that the air supply valve 13 and the drain valve 14 are closed.

2. The box wrench type work hand 11 removes the nut 3B, the cover 4 is removed from the opening 2, and the parallel movement work hand 12 stores it in an empty space S (shown by a chain double-dashed line in FIG. 2) in the glove box 10. . At this time, the water B flows into the glove box 6 and becomes full.

3. The alternative cover 10 in the glove box 10 is moved to the opening 2 by the parallel movement work hand 12, the nut 3B is attached by the box wrench type work hand 11, and the alternative cover 10 is attached to the opening 2. This allows
The inside of the glove box 6 and the outside of the ship are cut off.

4. The air supply valve 13 and the drain valve 14 are opened to drain the water in the glove box 6. 5. Remove the nut 9B and attach the glove box 6 to the outer plate 1
Remove more. Therefore, the cover 4 and the anode electrode 5 can be taken out into the atmosphere.

6. The anode electrode 5 of the cover 4 is replaced. 7. The cover 4 is put in the glove box 10, and the glove box 6 is attached to the outer plate 1 (opening 2) again with the nut 9B.

8. The nut 3B is removed by the box wrench type working hand 11, the alternative cover 10 is removed by the opening 2, and the glove box 10 is moved by the parallel moving working hand 12.
Store in the original space inside. At this time, the water B flows into the glove box 6 and becomes full.

9. The cover 4 in the glove box 10 is moved to the opening 2 by the parallel movement work hand 12, the nut 3B is attached by the box wrench type work hand 11, and the cover 4 is attached to the opening 2. As a result, the inside of the glove box 6 and the outside of the ship are shut off from each other.

10. The air supply valve 13 and the drain valve 14 are opened to drain the water in the glove box 6. 11. Remove the nut 9B and attach the glove box 6 to the outer plate 1
Remove more.

As described above, the operator can mount or check / replace the anode electrode 5 using the glove box 6 safely and securely without diving from the inside of the ship. Further, if one glove box 6 is provided, it is possible to handle a large number of covers 4, and the anode electrode 5
(Accessories) can be installed or checked / replaced quickly and efficiently. Further, since the glove box 6 is inside the ship and can be removed and disassembled, it can be used only when inspecting or replacing the accessory outside the ship, which is simple and economical.

Further, since the box wrench type working hand 11 has the magnet 15 incorporated at the tip thereof, the nut 3
When B is removed, the trouble of being lost or dropping can be solved, and the positioning of the cover 4 and the alternative cover 10 becomes easy.

If the anode electrode 5 to be replaced is attached to the outer side of the alternative cover 10, the replacement work of the anode electrode 5 can be completed at the point (5) in the above procedure, and the anode electrode 5 can be replaced. 5 can be installed more quickly and efficiently,
Alternatively, it can be replaced. Further, the old anode electrode 5 of the cover 4 can be taken out.

When the cover 4 and the alternative cover 10 are large in size and heavy in weight, it is possible to cope with them by providing a trolley and rails in the glove box 6 for front and rear and parallel movement. It can also be supported by a slide system.

[0033]

As described above, according to the accessory inspection / replacement device for an underwater structure according to the first aspect, it is possible to safely carry out attachment or inspection / replacement of accessories without diving from the inside of the ship. Also, if there is one glove box, it can handle many covers, and accessories can be quickly or efficiently attached, or inspection / replacement can be performed. Also, since the glove box is on the ship and can be removed and disassembled, it can be used only when installing the outboard accessories, or when performing inspection / replacement work, which is simple and economical.

According to the accessory inspection / replacement device for an underwater structure according to claim 2, when the accessory to be replaced is previously attached to the replacement cover, the accessory replacement work can be performed by replacing the cover and the replacement cover. The accessories can be installed or replaced more quickly and efficiently.

[Brief description of drawings]

FIG. 1 is a sectional view of an inspection / replacement device for an underwater structure and an accessory according to an embodiment of the present invention.

FIG. 2 is a front view of the accessory inspection / replacement device for the underwater structure.

FIG. 3 is a side view of a box wrench type working hand of the inspection / replacement device for accessories of the underwater structure.

FIG. 4 is an explanatory diagram showing a situation in which an unmanned device such as a robot is used for operation.

FIG. 5 is an explanatory diagram showing a situation in which a submersible infiltrates into an underwater chamber and works inside thereof.

[Explanation of symbols]

 A Underwater structure B Water 1 Skin 2 Opening 3A, 9A Implanting bolt 3B, 9B Nut 4 Cover 5 Anode electrode (accessory) 6 Glove box 7 Flange 10 Alternative cover 11 Box wrench type work hand 12 Parallel movement work hand 13 Air supply valve 14 Drain valve 15 Magnet 16 Box wrench 17 Handle 18 Seal structure

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Hiroshi Tatsumi, Inventor Hiroshi Tatsumi 5-3, Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. No. 28 in Hitachi Shipbuilding Co., Ltd.

Claims (2)

[Claims] 1. An underwater structure outer plate is provided with an opening, and a cover for attaching an accessory to the outside of the ship is fixed to the opening so as to be removable from the inside of the ship. A watertight glove box capable of water supply and drainage is attached and detachably provided, and in the glove box, an alternative cover that covers the opening instead of the cover and is detachably attached to the opening, and a replacement means for the cover and the alternative cover are provided. An inspection / replacement device for underwater structure accessories, which is equipped with a. 2. The inspection / replacement device for an underwater structure accessory according to claim 1, wherein the alternative cover can be attached to the accessory.