JP2902995B2 - Dry type underwater working equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a work space in an atmospheric pressure environment which is open on the bottom surface side of a ship or a floating offshore structure having a flat bottom surface and which is submerged outside. The present invention relates to a dry-type underwater working device capable of performing welding, inspection, repair, painting, cleaning, and the like on a bottom surface.

[0002]

2. Description of the Related Art Conventionally, ships and floating offshore structures having a flat bottom surface (hereinafter referred to collectively as "floating offshore structures") have been known.
There is a demand to weld, inspect, repair, or paint, clean, etc. the outer bottom surface of the water. Among these demands, for example, a request to weld the submerged outer bottom surface of a floating offshore structure will be described as an example.When such a floating offshore structure is manufactured, generally, a factory interior is manufactured. It is manufactured using a dock, etc., but there is a limit to the size that can be manufactured for a dock, etc., and both length and width are several hundred meters.
In the case of a very large floating offshore structure exceeding the limit, it cannot be manufactured. Therefore, when manufacturing an ultra-large floating offshore structure, a plurality of floating units are manufactured at a factory or the like, and the floating units are transported to a predetermined location on the ocean, and then the floating units are combined on the ocean. A method is needed to assemble the entire floating offshore structure.

[0003] As a technique for connecting such a plurality of floating units at sea, there is a water-stop box system (waterproof compartment system) in which a joint is welded and then joined under an atmospheric pressure environment.
In this water-stop box system, a watertight unit is sealed on the sea with the floating unit sealed with a waterstop plate, and a wall surrounding a predetermined range is provided to form a waterproof section, and seawater in the waterproof section is discharged. After the joint is brought into the atmospheric pressure environment, the joints of the two floating units are welded from the upper surface to be integrated (conventional example 1).

Further, as a prior art relating to underwater working devices, there is an invention described in Japanese Patent Application Laid-Open No. 54-28743.
In the present invention, the seam of the portion where the structure is located is discharged while the structure is sequentially moved from the sea side to the sea side while the joint of the floating marine structure is sealed in advance from the bottom surface outside the water submersion. After that, the sealing member of only that portion is removed and the joint is welded, and by repeating this operation sequentially, the bottom surface side of the floating offshore structure outside the water is welded (conventional example 2).

Further, as another prior art, Japanese Patent Laid-Open No.
There is also an invention described in Japanese Patent No. 180059,
A required part of the structure submerged in water is covered locally with a waterproof pressure-resistant shell, and the water inside the waterproof pressure-resistant shell is discharged to create a working space inside (conventional example 3). .

As another conventional technique, there is a contrivance of utility model registration No. 3014130. In this contrivance, in order to eliminate poor visibility and poor welding during inspection and repair of a ship bottom, only the head of a diver is used. An underwater working device for setting the environment to an atmospheric pressure environment (conventional example 4).

[0007]

However, in the above prior art example 1, it is necessary to install a waterproof plate forming a waterproof section at a narrow pitch on the upper surface of the joint located underwater to prevent water intrusion. A large amount of labor and time is required for the water stoppage work for forming the section. Moreover, even if water is stopped, only the upper surface of the joint is in an atmospheric pressure environment, so that the joint of the joint is one-sided welding from the upper surface. Furthermore, when a floating unit constituting an ultra-large floating type offshore structure is to be joined offshore, the welding length becomes very long, so that the working efficiency is deteriorated and the manufacturing cost and time are increased.

Further, in the above-mentioned conventional example 2, although the structure is used for underwater welding, it is necessary to attach a seal member in advance to the outer bottom surface of the joint at the outside of the submersion. For this reason, it is necessary to dive for a long time in the water, and the diver operation requires much time and labor. In addition, since the welding operation is performed after the sealing member once attached is removed during the operation, the operation requires much time and labor.

Further, in the above-mentioned conventional example 3, a predetermined working space can be created by the waterproof pressure-resistant shell, but this waterproof pressure-resistant shell is not equipped with a tank for adjusting the floating balance or a propulsion device for moving. Therefore, it is very difficult to move the floating body to a predetermined position on the bottom surface outside of the water submersion, and it is not possible to perform efficient underwater work.

Further, in the above-mentioned conventional example 4, since a diver capable of diving underwater and working is also required to perform welding work, it is assumed that the diver is a qualified person capable of welding. Only the assigned worker can work, and cannot work efficiently. Moreover, since the ventilation during operation is very difficult, it is not suitable for use in underwater welding of floating offshore structures.

The problems in these conventional examples are not limited to the welding work for connecting the floating units,
The same applies when inspecting, repairing, painting, cleaning, etc. the submerged bottom surface of a floating offshore structure, and it is difficult to work easily from underwater to an atmospheric pressure environment, so that efficient work cannot be performed.

[0012] Therefore, there is a long-felt need for a dry-type underwater working device that can easily work on the outer bottom surface of a floating offshore structure from underwater under atmospheric pressure.

[0013]

In order to solve the above-mentioned problems, a dry-type underwater working apparatus according to the invention of the present application has a structure in which a working space is formed on the bottom surface side of a floating offshore structure outside the submersion. The body may be provided with a buoyancy balance means and a pouring / draining means, and the sealing means surrounding the working space provided on the upper surface of the structure may be settled or separated on the outer bottom surface submerged by the guide means provided at a predetermined position. It can be so.

Thus, if the sealing means provided on the upper surface of the structure is settled on the outer submerged bottom surface of the floating marine structure and the working space is drained, the floating marine structure can be moved from the working space under the atmospheric pressure environment. Welding, inspection, repair, painting,
Can perform tasks such as cleaning. In particular, when connecting multiple floating units that make up a very large floating type offshore structure, the joint can be welded from the outside bottom surface under the atmospheric pressure environment, so that both sides of the joint can be welded. Become.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dry-type underwater working apparatus according to the present invention is provided with a structure having a working space which is open on the bottom surface side of a floating offshore structure which is submerged outside, and the structure is provided with a floating weight balance. Providing a floating means for providing and suspending the floating and providing a means for pouring and draining water to and from the working space, and further providing a sealing means over the entire periphery of the working space on the upper surface of the structure,
The longitudinal and lateral position of the structure, at the time of movement to Hanaresoko from submerged outside bottom of said sealing means, the guide means can be bottom landing to submerge outside bottom surface of said sealing means when working the
On the left and right rails provided on the bottom outside the submersion of the floating offshore structure
Along and along at least one of the rails
The means is provided with a lateral roller for restricting lateral movement of the structure . Accordingly, if the sealing means provided on the upper surface of the structure is settled on the outer bottom surface of the submerged water and the inside of the working space is drained by the injection / drainage means, the working space of the atmospheric pressure environment opened to the outer bottom surface side of the submerged water can be easily formed. be able to. If this work space is formed in the longitudinal direction, continuous work in the longitudinal direction can be performed efficiently.

[0016] Also, before SL can stabilize the movement of the dry water working device along the rails provided on the submerged outside bottom surface of the floating offshore structure, submerged outer bottom by injecting compressed air between the left and right rails Can be easily joined by welding or the like on the upper surface side of the predetermined range where the water is stopped. The horizontal rollers provided on the guide means along at least one of the rails for restricting the lateral movement of the structure enable stable movement of the dry-type underwater working apparatus while restricting the horizontal movement thereof.

Further, the guide means may be a floating marine structure.
The guide consists of a guide roller along the bottom surface
If supported by the structure of the roller in vertically movable link mechanism, it moves Ki out possible to easily dry underwater work device along the submerged outside bottom surface by the guide roller, to adjust the bending amount of link mechanism This facilitates the separation or landing of the dry-type underwater working device.

Further, a predetermined position of the structure, by providing the fixing means for supporting the lateral forces acting on the structure in the floating offshore structure, firm and dry underwater work unit and floating offshore structure The bottoming state can be maintained even when a lateral force such as a tidal force acts on the dry-type underwater working device. If this fixing means is formed by a clamp mechanism, and the structure is fixed to the rail by the clamp mechanism, the dry underwater working device can be mechanically fixed to the floating offshore structure using the rail.

Further, if the work space is formed so as to be able to communicate with an access trunk penetrating the submerged outer bottom surface provided in the floating offshore structure, it is possible to easily enter and exit the work space and ventilate from the access trunk. be able to. If this work space is formed so as to be able to communicate with the two access trunks, it is possible to more efficiently enter and exit the work space and ventilate the work space.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a plan view of a dry-type underwater working device showing an embodiment of the invention according to this application, FIG. 2 is a side view of the dry-type underwater working device, FIG. 3 is a front view of the dry-type underwater working device, and FIG. Is an AA cross-sectional view of the dry type underwater working device,
FIG. 5 is a sectional view taken along line BB of FIG. In this embodiment, an example will be described in which a bottom plate of a joint portion q of a floating unit m constituting a floating type offshore structure M is welded and joined from a submerged outer bottom surface n side.
An access trunk p that penetrates in the vertical direction is provided at a predetermined position of the floating unit m.

As shown in the figure, the basic structure of the dry-type underwater working device V is a structure 1 having a vertically long working space 2 which is open to the bottom surface n of the floating offshore structure M, which is submerged outside, and this structure. 1. A buoyancy tank 10 and a ballast tank 3 serving as a buoyancy balance means E for adjusting the buoyancy balance in 1.
An injection / drainage valve 4 serving as an injection / drainage means F for injecting / draining water from / into the work space 2, and provided over the entire periphery of the work space 2 on the upper surface of the structure 1 and submerged in the floating marine structure M A sealing member 5 serving as a sealing means G for exerting a sealing action with the outer bottom surface n; and a sealing member 5 provided at a predetermined position of the structure 1 to move the dry-type underwater working device V to the submerged outer bottom surface n And a guide roller 6 serving as guide means H capable of allowing the seal member 5 to land on the outer bottom surface n during submersion at the time of work. W
Indicates the water surface. In this embodiment, a rail 7 is provided on the bottom surface n outside the water of each floating unit m, and the dry-type underwater working device V is moved between these rails 7 and along the rail 7. Is shown.
If the rail 7 is provided so as to sandwich the joint q in this way,
By injecting compressed air between these rails 7, water can be discharged and the lower surface of the joint q can be brought to atmospheric pressure. Therefore, prior to installing the dry underwater working device V, the joint of the floating unit m The upper surface of the bottom plate of q can be welded in advance. If there is no single rail 7 or rails, a water stop plate with a depth greater than the draft is provided at the front and rear positions corresponding to the length of the dry-type underwater working device V inside the hull on the floating unit m side. Since water can be prevented from entering the working space 2 from the outside when draining the working space 2 of the dry-type underwater working device V, welding can be performed simultaneously from the upper and lower surfaces of the bottom plate of the joint q. .

The above-mentioned structure 1 has a vertically long working space 2 formed so that work can be continuously performed in the longitudinal direction of the floating unit m. As a whole shape, only the upper surface of the working space 2 is open and other surfaces are opened. Has a box shape formed by a wall surface having a predetermined strength. The work space 2 of the structure 1 is provided with an access trunk p formed in the floating unit m during work.
It is configured so that the worker can enter and exit from the floating unit m via the access trunk p and the worker elevating ramp 2a provided in the work space 2 via the access trunk p. If the work space 2 is communicated with the access trunk p, ventilation, air supply, power supply, and the like during work can be easily performed. Further, a drain recess 8 which is one step lower than the inside of the work space 2 is formed at a lower part of the front and rear ends of the work space 2, and a drain pump 20 of a pouring / draining means F described later is provided in the drain recess 8. I have.
Further, a predetermined upper position of the structure 1 (four corners in this embodiment)
Is provided with an ascending position restricting member 9 which abuts on the rail 7 to regulate the elevation of the dry-type underwater working device V.

The ballast tanks 3 are provided at predetermined positions where the structure 1 can be easily balanced. In this example, the ballast tanks 3 are provided at four corners located in front, rear, left and right in the longitudinal direction. Buoyancy tanks 10 are provided adjacent to the ballast tanks 3 respectively. By adjusting the buoyancy of the buoyancy tank 10 and the buoyancy of the ballast tank 3, the underwater weight of the entire dry-type underwater working device V and the buoyancy balance at the front, rear, left and right positions are adjusted. The adjustment of the underwater weight in the dry-type underwater working apparatus V includes adjusting the weight of the dry-type underwater working apparatus V until it is brought to the bottom of the floating unit in the state where the dry-type underwater working apparatus V is completely immersed and the working space 2 is filled with water. The buoyancy is adjusted to be slightly greater than the buoyancy, and once installed at the bottom of the floating unit, the buoyancy is adjusted to be slightly greater than the weight, that is, to have a slight positive buoyancy as a whole. The magnitude of the positive buoyancy of the dry-type underwater working device V is such that the guide roller 6 allows the dry-type underwater working device V to land on or be separated from the bottom surface n outside the water.

The sealing member 5 is provided on the entire surface of the structure 1 so as to surround the working space 2. In this embodiment, two sealing members are provided. The two sealing members 5 are formed of an elastic material such as rubber, and as shown in the operation explanatory diagram of FIG. 6 described later, a soft lip seal 5a having a low surface pressure is provided on the outside, and the inside is provided on the inside. An annular hollow seal 5b having a high surface pressure is provided. In this embodiment, the amount of bending of the seal member 5 is limited by the ascending position restricting member 9 provided at a predetermined position of the structure 1, so that these seal members 5 can exhibit a preferable sealing effect and can be sealed. The member 5 is protected.

The guide rollers 6 are provided along rails 7 provided on the left and right sides of the structure 1, and are provided at four front, rear, left and right corners of the structure 1. Each of the guide rollers 6 is provided with a vertical roller 6a for vertically guiding the dry-type underwater working device V along the bottom surface of the rail 7. In this embodiment, one of the rails 7A (the lower side of FIG. A lateral roller 6b for restricting lateral movement is provided on the guide roller 6 along the right side of FIG. This horizontal roller 6b
Is provided to restrict the horizontal movement of the dry-type underwater working device V.

The guide roller 6 is configured to be able to move up and down so that the distance between the structure 1 and the rail 7 can be changed. Floating unit m
The bottom surface is separated from the submerged outside bottom surface n so that the dry type underwater working device V can be landed on the submerged outside bottom surface n during work.

FIG. 6 is a view for explaining the operation of the guide roller 6 serving as the guide means H in the dry type underwater working device V.
(a) is a main part enlarged side view showing movement, (b) landing, and (c) work. The guide roller 6 will be described below based on these drawings. During the movement shown in (a),
Water is injected into the work space 2 of the structure 1 so that the dry-type underwater working device V has a predetermined positive buoyancy.

First, the structure of the guide roller 6 will be described. The guide roller 6 is provided on a support frame 11 whose base end 11a is pivotally supported by the structure 1 and whose front end can swing vertically. The vertical roller 6a is supported by a horizontal shaft 11b provided on the support frame 11. The lower end on the distal end side of the support frame 11 is connected to the protruding portion 1a of the structure 1 by a link mechanism 12 which can move up and down. Is connected to the cylinder 13. The connecting portion at the tip of the cylinder 13 has an elongated hole 1 in the axial direction.
3a are formed, and the link mechanism 1 is formed by the elongated holes 13a.
2 by connecting with the connecting portion 12a.
A large force is prevented from directly acting on the cylinder 13 from above.

When the dry-type underwater working apparatus V is moved as shown in (a), the cylinder 13 is contracted to incline the link mechanism 12 toward the structure 1, and the guide roller 6 moves a predetermined distance from the rail 7 to the structure 1. , The seal member 5 separates from the submerged bottom surface n of the floating unit m to form a predetermined gap a. At this time, the link mechanism 12 is mechanically stopped by the stopper 14 provided on the structure 1 in a state where the link mechanism 12 is inclined toward the structure 1, thereby acting in the vertical direction of the structure 1. The buoyancy is not always required to be supported by the cylinder 13.

Next, at the time of the landing shown in FIG.
By stretching the link mechanism 3 and bending the link mechanism 12 toward the opposite side of the structure 1, the buoyancy of the structure 1 causes the dry-type underwater working device V to float and the seal member 5 to land on the outer bottom surface n submerged in water. At this time, by adjusting the extension amount of the cylinder 13, the seal member 5 can be gently brought into close contact with the bottom surface n outside the water of the floating unit m. In this embodiment, the sealing member 5 is composed of a lip seal 5a and an annular hollow seal 5b having the same height, and a seal having a low surface pressure by the lip seal 5a and a seal having a high surface pressure by the annular hollow seal 5b. The double sealing structure that combines the above features ensures a reliable sealing effect. If the height of the lip seal 5a is formed higher than the annular hollow seal 5b,
After the outer lip seal 5a has settled on the outer bottom surface n of the submergence to perform the initial seal, the inner annular hollow seal 5b has settled on the outer bottom surface n of the submergence to perform the load support and the main seal. A seal structure that exerts the action in two stages can be provided. These may be set as appropriate according to the size of the dry-type underwater working device V, the place of use, and the like.

At the time of the operation shown in (c), the structure 1 is drained from the working space 2 from the landing by the guide rollers 6 using only the buoyancy of the structure 1 adjusted to the predetermined buoyancy. The buoyancy of the structure itself is increased (for example, about 10 times), and the buoyancy firmly adheres the structure 1 to the bottom surface n outside the water. When the buoyancy acts, the seal member 5 bends by a predetermined amount to exhibit a reliable sealing effect. At this time, if the cylinder 13 is kept free, the flying height of the structure 1 can be followed. Further, since the connecting portion between the cylinder 13 and the link mechanism 12 is also the elongated hole 13a, even if the bending amount of the link mechanism 12 changes as the structure 1 floats, no excessive force acts on the connecting portion. .

After the sealing member 5 on the upper surface of the structure 1 is settled on the outer bottom surface n by using the guide roller 6 along the rail 7 provided on the outer bottom surface n of the submerged surface,
If the inside of the work space 2 is drained, the work space 2 of the atmospheric pressure environment can be formed. Then, from the working space 2 in the atmospheric pressure environment, the work on the submerged outer bottom surface n located at the upper portion can be easily performed.

In this embodiment, the guide means H is constituted by the guide roller 6 supported by the link mechanism 12 which moves up and down. However, the guide means 6 may be constituted by moving the guide roller 6 up and down directly by a cylinder. Alternatively, any other configuration may be used as long as the guide means H can make the upper surface of the structure 1 land on or separate from the bottom surface n outside the water.

On the other hand, FIGS. 7A and 7B are views showing fixing means provided in the dry-type underwater working device V. FIG.
FIG. 3B is an enlarged front view of a main part before fixing, and FIG. In this embodiment, by providing a fixing means J for mechanically fixing the dry-type underwater working device V in a state where the dry-type underwater working device V is landed on the outer bottom surface n of the submersion, the dry-type underwater working device V is provided with a large tidal force or the like in the state of being settled down. The bottoming state can be maintained even when a lateral force acts.

The fixing means J is formed by a clamp mechanism k, and is attached to a mounting frame 1 provided on the side of the structure 1.
5, the top 16a of the triangular connecting member 16 is pivotally supported, and the tip 1
The base end of the clamp member 17 is pivotally supported by 5a. A tip 18a of a telescopic cylinder 18 is pivotally supported by a lower apex 16a of the connecting member 16, and one end of a link member 19 is rotatably supported by an upper apex 16a. The other end of the link member 19 is supported at substantially the center of the clamp member 17. Therefore, by expanding and contracting the telescopic cylinder 18, the rail 7 of the floating unit m and the structure 1 are mechanically fixed or released by the pressing surface 17 a of the clamp member 17 via the connecting member 16 and the link member 19. Or you can.

The state shown in (a) is when the dry-type underwater working device V is moving, and when the clamp mechanism k is released,
The state where the structure 1 is separated from the outer bottom surface n of the floating unit m is shown. In this state, the clamp member 17 is removed from the rail 7 by contracting the telescopic cylinder 18 and rotating the connecting member 16 to the left in the drawing.

The state shown in (b) is a drawing of a state in which the clamp mechanism k is operated in a state in which the structure 1 is settled on the outer bottom surface n of the submerged water. Is rotated to the right in the drawing, and the link member 19 presses the pressing surface 17 a at the tip of the clamp member 17 against the upper surface of the rail 7.

The state shown in (c) is a state in which the rail 7 is further pressed by the tip of the clamp member 17 from the state shown in (b) and the structure 1 and the rail 7 are securely fixed. In FIG. 7B, the telescopic cylinder 18 is further extended from the state shown in (b), and the ascending position restricting member 9 for restricting the ascending position of the structure 1 is brought into close contact with the rail 7. In this state, the shaft center b that supports the link member 19 on the clamp member 17 is positioned above the pressing surface 17a at the tip of the clamp member 17, and the shaft center b is connected to the link member 19 by the connecting member. The connecting member 16 is positioned outside (a side opposite to the structure 1) a line connecting the shaft center c that supports the shaft 16 and the shaft center d that supports the connecting member 16 to the mounting frame 15. In this manner, the shaft center b is positioned above the pressing surface 17a, and the shaft centers c and d
Position outside the telescopic cylinder 18
In addition to the fixing by the elongation force, the mechanical fixing by the relation of the point of action of the force by the pivot position is performed.

By providing the fixing means J, even if the tidal force or the like acts on the floating offshore structure M, the dry underwater working device V can be reliably fixed to the submerged outer bottom surface n. The fixing means J is not always necessary depending on the limited sea or marine conditions inside the breakwater, and the buoyancy of only the dry-type underwater working device V is large and can be firmly fixed to the submerged outer bottom surface n. In this case, there is no need to provide.

FIGS. 8 (a) and 8 (b) are a plan view and a longitudinal sectional view showing an example of the water pouring / draining means F in such a dry type underwater working device V. As shown in (a), the injection / drain valve 4 provided on one side of the structure 1
And a drainage pump 20 in a drainage recess 8 formed at both ends of the working space 2, a pipe 21 for connecting these, and an opening / closing operation of the injection / drainage valve 4 and a drive of the drainage pump 20 which are not shown. It comprises a control device and a plurality of float switches 22 provided at predetermined positions in the work space 2. The drainage in the working space 2 is drained from the drainage pump 20 to the outside by the drainage valve 4b through the pipe 21, and water is injected from the opened drainage valve 4b into the working space 2 through the water injection valve 4a. Is done. At the time of this water injection, the drainage pump 20
A check valve 23 for preventing backflow to the drainage pump 20 is provided near the drainage pump 20.

The drainage control in the work space 2 is as follows:
As shown in the figure, the water level is controlled by water levels detected by a plurality of float switches 22 provided so as to detect a predetermined water level. Usually, a float switch 22 provided at a water level e in the drainage recess 8 is provided. , The drainage pump 20 is driven to automatically drain water, so that water is accumulated only in the lower portion of the drainage recess 8 during work.

On the other hand, if there are irregularities on the bottom surface n outside the water,
There is also a case where water is flooded into the work space 2 from that portion. When the water level becomes f due to such flooding, the drainage pump 20 automatically operates to perform a drainage operation of the inflow water. It should be noted that, even if the drainage work is performed from the water level f, the flooding warning is issued if the flooding amount is large and the water level g is reached. When the flood warning is issued, the worker goes out of the access trunk p and onto the floating unit m.

Since it is not necessary to control the water level during water injection, only the opening and closing control of the water injection valve 4a and the drain valve 4b is performed.

FIGS. 9 (a) to 9 (d) are pneumatic diagrams of this dry-type underwater working device V, where (a) is a plan view, (b) is a side view, and (c) is a longitudinal section showing a central portion. FIG. 2D is a longitudinal sectional view showing both ends. Piping 25 from an air supply source (not shown) to a control room 24 provided above the floating offshore structure M
In this example, a ballast tank pipe 26 is provided in a pipe 25 before being supplied to the control room 24, and the air is supplied into the ballast tank 3 provided before and after the structure 1 by the ballast tank pipe 26. Is supplied. In addition, air is supplied from the control room 24 to the air pockets 1d formed on both sides of the structure 1 by the pipe 27 via the electromagnetic valve 24a and the filter 24b. A check valve 27a is provided. The air in the air pocket 1 d is supplied to the water level g or h by the float switch 22.
It is used for emergency evacuation of workers in case of flooding even after detecting

In addition, a water injection hole 28 is provided below the ballast tank 3 so as to naturally inject water into the ballast tank 3. The buoyancy of the ballast tank 3 is adjusted by the inflow water from the water injection hole 28 and the compressed air supplied from the ballast tank pipe 26. After the buoyancy balance and the normal buoyancy of the dry-type underwater working device V are once adjusted, Then, the valve 26a is closed and the pipe 26 is removed.

FIG. 10 is a drawing showing an example of a floating offshore structure M using the above-mentioned dry-type underwater working device V, and (a)
Is a side view, (b) is a plan view, and (c) is a CC enlarged cross-sectional view of (b). In this example, an ultra-large floating marine structure M is to be formed on the sea by connecting a plurality of floating units m at a joint q, and such an ultra-large floating marine structure M is to be formed. The case where the floating unit m forming the above is connected in the longitudinal direction by the dry-type underwater working device V will be described below. The super-large floating marine structure M is moored at a predetermined position on the sea floor s by a plurality of mooring devices r.

FIGS. 11A and 11B are diagrams showing towing procedures when the floating offshore structure of FIG. 10 is connected by a dry-type underwater working device, wherein FIG. 11A is a plan view and FIG. 11B is a side view. As shown in the drawing, first, the dry-type underwater working device V suspended by a crane or the like is submerged from the side of the floating unit m into the sea and moved to the lower part of the connection part q. In this embodiment, since the rail 7 is provided, the guide roller 6 is engaged with the rail 7. At this time, the end of the wire 29 inserted from the access trunk p provided at the other end of the floating unit m is connected to the bracket 1e (see FIG. 1) provided at the front end side of the dry-type underwater working device V, A bracket 1e (see FIG. 1) provided on the rear end side of the dry-type underwater working device V includes:
The other end of the wire 29 is connected from this side end. The front end side wire 29 is connected to the electric winch 31 via the sheave 30.
The underwater wire device 29 is connected to a bollard 32 via a sheave 30 to adjust the speed as a brake rope.

The guide roller 6 engaged with the rail 7 is brought to the state shown in FIG. 6A, and the dry type underwater working device V moved to a predetermined position (solid line position in the figure) by the electric winch 31 is As shown in FIGS. 6 (b) and 6 (c), the guide roller 6 causes the bottom surface n to be settled on the outer bottom surface n, and the work space 2 of the structure 1 is drained. The movement to the predetermined position can be performed quickly if, for example, a stopper for contacting the guide roller 6 is provided at a predetermined position on the rail 7 in advance.

Since the inside of the work space 2 which has landed and drained at a predetermined position in this way has the atmospheric pressure, the bottom plate of the connection part q of the floating unit m is joined by welding from the inside of the work space 2 under the atmospheric pressure environment. Can be easily performed. At the time of this welding, since the work space 2 and the access trunk p communicate with each other, sufficient ventilation can be performed from the access trunk p. In addition, even when the bottom plate of the connection portion q is painted after welding, it can be performed under the atmospheric pressure environment, and the ventilation at this time can be easily performed from the access trunk p.

When the dry underwater working device V is moved to the next predetermined position after a lapse of a predetermined time, water is poured into the work space 2 as described above, and the dry underwater working device V is set to a predetermined positive buoyancy to be submerged outside. Then, the wire 29 is wound up by the electric winch 31 to move to the next predetermined bottom position outside the submerged water. Thereafter, as described above, the dry-type underwater working device V is settled on the bottom surface n outside the water, and the inside of the working space 2 is drained to an atmospheric pressure environment.
Welding and painting. Thereafter, the above operation is sequentially repeated.

FIGS. 12 (a) to 12 (c) are side views illustrating the relationship between the dry-type underwater working device and the access trunk during the movement shown in FIG. 11, and FIG. An example in which the access trunk p of the floating unit m communicates with the front and rear positions of the space 2 is shown.

In this example, as shown in (a), a pipe 27 connected to the control room 24 on the floating unit m at a predetermined position is provided.
(B) from the access trunk p forward in the direction of travel into the dry-type underwater working device V to supply power, etc.
As shown in (c), when the dry-type underwater working device V is moved forward, the dry-type underwater working device V is moved forward while the cable is inserted into the work space 2, and as shown in FIG. When the movement to the work position is completed, the cable is moved so as to take out the cable from the rear access trunk p.

As described above, the dry-type underwater working device V is arranged such that the access trunk p communicates with the front and rear two places of the working space 2.
By setting the shape of the work space 2 and the pitch of the access trunk p, it is easy to get in and out of people, supply power, vent air when pouring and draining the work space 2, ventilate when welding, attach moving wires, etc. It becomes possible and workability can be greatly improved.

As described above, according to the dry-type underwater working device V, it is possible to easily form the atmospheric pressure environment on the outer bottom surface n of the floating offshore structure M under water. The bottom plate of the portion q can be easily welded from both upper and lower surfaces under an atmospheric pressure environment.

In the above embodiment, the electric winch 31 provided on the floating unit m uses the dry type underwater working device V.
Although the example which moves is shown, although it is a means which can move the dry-type underwater working device V to a predetermined position, it is not specifically limited. This moving means may be provided in the dry-type underwater working device V, and may be a self-propelled machine capable of moving the dry-type underwater working device V to an arbitrary position by itself. These selections may be appropriately determined according to the purpose of use and the place of use of the dry-type underwater working device V.

[0056]

The invention according to this application is implemented in the form described above, and has the following effects.

According to the dry type underwater working device, if the sealing means on the upper surface of the structure is settled on the outer bottom surface of the floating offshore structure and submerged, and the working space is drained, the inside of the working space is set to the atmospheric pressure environment. This makes it easy to weld, inspect, repair, paint and clean the submerged outer bottom surface through the opening of this work space. It can be manufactured with reduced work time.

Further, by providing the floating type offshore structure with rails for guiding the guide means of the structure, it is possible to easily move the dry-type underwater working device in any direction. if injected gas between rails provided on both sides, and easily can be welded by a dry bottom plate upper surface. And at least one of these rails
Is provided with the horizontal roller for regulating the lateral movement of the structure to guide means along the, it is possible to stabilize the movement of the dry water working device which regulates the horizontal movement of the dry water working device.

Further, if the guide means is formed by a guide roller along the outer bottom surface of the submersion, the dry type underwater working device can be easily moved along the outer bottom surface of the submersion, and the link mechanism can move the guide means up and down. When the dry-type underwater working device is supported by the structure, it can be easily separated from the bottom surface of the submerged outer surface or landed.

Further , if fixing means is provided before and after the structure, the dry-type underwater working apparatus and the floating offshore structure are firmly fixed to resist lateral force such as tidal force acting on the dry-type underwater working apparatus. If this fixing means is formed by a clamp mechanism to fix the rail and the structure, it is easy to mechanically fix the dry-type underwater working device to the floating offshore structure using the rail. It becomes possible.

[0061] Also, if the working space Floating Structure Access trunks and communicatively formed provided dry underwater work unit, is readily possible to enter and exit from the floating offshore structure into the working space In addition, it is possible to easily ventilate the inside of the work space using the access trunk. If this work space can communicate with two access trunks, it is possible to further improve workability and ventilation.

[Brief description of the drawings]

FIG. 1 is a plan view of a dry-type underwater working apparatus showing one embodiment of the invention according to the present application.

FIG. 2 is a side view of the dry-type underwater working device shown in FIG.

FIG. 3 is a front view of the dry-type underwater working device shown in FIG. 1;

FIG. 4 is a sectional view taken along line AA shown in FIG.

FIG. 5 is a sectional view taken along line BB shown in FIG. 1;

FIGS. 6A and 6B are operation explanatory diagrams showing guide means in the dry-type underwater working apparatus of FIG. 1, wherein FIG. 6A shows a moving state, FIG. 6B shows a landing state, and FIG. It is a part enlarged side view.

FIGS. 7A and 7B are operation explanatory views showing clamping means in the dry-type underwater working device of FIG. 1, wherein FIG. 7A shows a moving state, FIG. 7B shows a state before fixing, and FIG. It is an enlarged front view.

FIGS. 8A and 8B are drawings of a pouring / draining means in the dry type underwater working apparatus shown in FIG. 1, wherein FIG. 8A is a plan view and FIG.

9 is an air system diagram of the dry-type underwater working apparatus shown in FIG. 1, wherein (a) is a plan view, (b) is a side view, (c) is a longitudinal sectional view showing a central part, and (d) is both ends. It is a longitudinal cross-sectional view which shows a part.

FIG. 10 is a drawing showing an example of a floating offshore structure using the dry-type underwater working device of the invention according to the present application;
Is a side view, (b) is a plan view, and (c) is a CC enlarged sectional view.

11A and 11B are drawings showing a towing procedure when the floating offshore structure of FIG. 10 is connected by a dry-type underwater working device, wherein FIG. 11A is a plan view and FIG. 11B is a side view.

12 (a) to 12 (c) are side views illustrating the relationship between the dry-type underwater working device and the access trunk during the movement in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Structure 1a ... Projection part 2 ... Work space 3 ... Ballast tank (floating weight balance means) 4 ... Injection / drainage valve (injection / drainage means) 5 ... Seal member (seal means) 5a ... Lip seal 5b ... Annular hollow seal 6 ... Guide roller (guide means) 6a ... Vertical roller 6b ... Horizontal roller 7 ... Rail 8 ... Drain recess 9 ... Rising position restricting member 10 ... Buoyancy tank (buoyancy balance means) 11 ... Support frame 12 ... Link mechanism 13 ... Cylinder DESCRIPTION OF SYMBOLS 14 ... Stopper 15 ... Mounting frame 16 ... Connecting member 17 ... Clamping member 17a ... Pressing surface 18 ... Telescopic cylinder 19 ... Link material 20 ... Drain pump 21 ... Piping 22 ... Float switch 23 ... Check valve 24 ... Control room 25 ... Piping 26 ... Ballast tank piping 27 ... Piping 28 ... Water injection hole 29 ... Wire 30 ... Sheave 31 ... Electric winch 32 ... Boller De E: Floating balance means F: Injection / drainage means G: Sealing means H: Guide means J: Fixing means k: Clamp mechanism (Fixing means) M: Floating offshore structure a: Gap b-d: Shaft center e- h: Water level m: Floating unit n: Submerged outer bottom p: Access trunk q: Connection V: Dry type underwater working device W: Water surface

──────────────────────────────────────────────────の Continuation of the front page (56) References JP-A-3-146268 (JP, A) JP-A-9-95295 (JP, A) JP-B-54-36590 (JP, B2) JP-B-54 26216 (JP, B2) Jikken Sho 59-5497 (JP, Y2) Registered utility model 3014130 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB names) B63B 9/00 B23K 9/00 107

Claims (6)

(57) [Claims] 1. A dry-type underwater working device for forming a working space of an atmospheric pressure environment on a bottom surface outside a submerged surface of a floating offshore structure, wherein the structure has a working space opened to the bottom surface side outside the submerged structure. The structure is provided with a buoyancy balance means for buoyancy balance, and a pouring / draining means for injecting / draining water into / from the working space is provided, and a sealing means is provided over an entire periphery of the upper surface of the structure surrounding the working space. the provided, the back and forth lateral position of the structure, at the time of movement to Hanaresoko from submerged outside bottom of said sealing means, working the floating guide means capable of bottom landing to submerge outside bottom surface of said sealing means when the marine structure Submergence of things
Provided along the left and right rails provided on an outer bottom surface of the rail
A transverse movement of the structure to at least one guide means
A dry-type underwater working device comprising a horizontal roller for regulating movement . 2. The method according to claim 1, wherein said guide means is provided in a floating offshore structure.
The guide roller is composed of a guide roller along the bottom
The underwater working apparatus according to claim 1 , wherein the structure is supported by a structure by a link mechanism that can move up and down . 3. The dry type as claimed in claim 1 , wherein a fixing means for supporting a lateral force acting on the structure by a floating offshore structure is provided at a predetermined position of the structure. Underwater working equipment. 4. The fixing means is formed by a clamp mechanism,
The dry underwater working apparatus according to claim 3, wherein the structure is fixed to the rail by the clamp mechanism. The method according to claim 5, wherein the work space, according to any one of claims 1 to 4, characterized in that the formed can communicate with the access trunk penetrating in submerged outside bottom surface provided in the floating offshore structure Dry underwater working equipment. 6. The dry-type underwater working apparatus according to claim 5 , wherein the work space is formed so as to be able to communicate with two access trunks.