JP2018188148A - Underwater transportation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underwater transportation method capable of realizing a work safer than a conventional pressure-proof buoy.SOLUTION: An underwater transportation method of transporting an aluminum anode 200 by using a pressure-resistant container 100 equipped with a first on-off valve 20 and a second on-off valve 30 on the outer wall part is an underwater transportation method of transporting the pressure-resistant container 100 and the aluminum anode 200 to an underwater predetermined position in a coupled state to hook the aluminum anode at the predetermined position, and to vent air inside the pressure-resistant container and inject water into the pressure-resistant container by opening the first and second on-off valves 20, 30 for a predetermined period, thereby making a force of the pressure-resistant container to tend to float up smaller than before opening the first and second on-off valves 20, 30, and decoupling the water-injected pressure-resistant container 100 from the aluminum anode 200 to transport the decoupled pressure-resistant container 100 to a water surface.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pressure vessel and an underwater transport method using the same.

  Conventionally, for the maintenance management of an iron pier in the sea, for example, an aluminum block (hereinafter referred to as an aluminum anode) is electrically used as a metal having a high ionization tendency with respect to an iron pier portion in the sea of the pier. An anti-corrosion construction method that is brought into contact with and attached to is known.

  As a conventional cathodic protection method, when the installation position is within the range where the crane can be operated, the aluminum anode is suspended by the crane and lowered into the sea as it is, and the aluminum anode is welded and fixed to the pier at the target position. However, if the mounting position is outside the operable range of the crane, the diver needs to carry the aluminum anode to the target position on the sea surface and in the sea.

  In that case, after the aluminum anode is lowered to the sea surface using a crane, a diver near the sea surface is connected in advance to the aluminum anode and the rope of one or more pressure-resistant buoys that have been thrown into the sea surface in advance. After connecting the wire with a connecting member such as a carabiner, the aluminum anode is removed from the crane.

  The pressure buoy in this case is selected such that the pressure buoy and the aluminum anode connected to each other in the sea slightly sink.

  After that, the diver moves the sea surface up to the target position while supporting the pressure-resistant buoy and the aluminum anode that are connected to each other so as not to sink to the seabed, and then submerges to the target position. Hook the loop part of the temporary fixing wire attached to the hook that is fixed in advance to the pier.

  And the wire which connected the pressure | voltage resistant buoy and the aluminum anode via the carabiner etc. is cut | disconnected, and a pressure | voltage resistant buoy is surfaced on the sea surface.

  The pressure-resistant buoy that has emerged on the sea surface is connected to another aluminum anode wire that has been lowered to the sea surface with a crane in the same manner as described above via a connecting member such as a carabiner, and the above series of operations is repeated again. Then, the temporary fixing work to the pier part for all the aluminum anodes is completed.

  Thereafter, the diver successively welds and fixes the aluminum anode temporarily fixed to the pier portion at that position.

  However, in such conventional underwater work, as described above, after the diver hooks the aluminum anode on the hook of the pier part, the wire that connects the pressure-resistant buoy and the aluminum anode via a carabiner or the like is cut. However, at that time, the pressure-resistant buoy rises suddenly toward the sea surface due to its original buoyancy, so it collides with the diver or collides with the air hose for supplying air to the diver from the sea and damages the air hose. There is a problem that it involves danger.

  An object of this invention is to provide the pressure | voltage resistant container which can implement | achieve a safer operation | work, and the underwater conveyance method using the same in view of the above such conventional subjects.

The first aspect of the present invention is
A pressure vessel with a hollow inside,
Provided with one or more on-off valves on the outer wall of the pressure vessel,
The pressure vessel can be switched between a communication state and a non-communication state by opening and closing the open / close valve.

  Thereby, safer work can be realized.

The second aspect of the present invention
There are two on-off valves, which are provided on opposite sides,
The pressure vessel according to the first aspect of the present invention is characterized in that a hose member can be connected to the front end side of the on-off valve provided on one side.

  Thereby, in addition to the effect of the first aspect of the present invention, by connecting the hose member to the front end side of the opening / closing valve, for example, when the air inside the pressure vessel is not connected to the hose member in water. Compared to a short time.

The third aspect of the present invention
An underwater transport method for transporting an object to be transported in water using a pressure vessel provided with one or more open / close valves on an outer wall,
Transport the pressure vessel and the object to be transported to a predetermined position in the water in a connected state,
At the predetermined position, the transport object is hooked, fixed, installed, or installed,
By opening the on-off valve for a predetermined period, the air inside the pressure-resistant container is evacuated and water is injected into the pressure-resistant container, and the force to lift by the pressure-resistant container is smaller than before opening the on-off valve. And
Remove the connection between the injected pressure vessel and the object to be transported,
Transport the pressure vessel that has been disconnected to the surface of the water,
It is the underwater conveyance method characterized by this.

  As a result, by making the force to rise by the pressure vessel smaller than before opening the on-off valve, the pressure vessel can be prevented from rising suddenly toward the water surface, and safer work can be realized.

The fourth aspect of the present invention is
There are two on-off valves, which are provided on opposite sides,
The underwater transport method according to the third aspect of the present invention, characterized in that an air vent hose having a predetermined length is connected to the front end side of the open / close valve located closer to the water surface.

  Thereby, in addition to the effect of the third aspect of the present invention, an air vent hose is connected to the front end side of the open / close valve. It can be removed in a shorter time compared to when it is not connected.

  According to the present invention, it is possible to provide a pressure vessel that can realize safer work and an underwater transport method using the pressure vessel.

The perspective view of the pressure vessel of this Embodiment Perspective view of aluminum anode used in this embodiment The schematic diagram for demonstrating the underwater transportation method of the aluminum anode using a pressure vessel which is one embodiment of the underwater transportation method of the present invention. The perspective view which shows the structure of the pressure vessel as another example

  Hereinafter, an embodiment of a pressure vessel of the present invention and an underwater transport method using the same will be described with reference to the drawings.

  FIG. 1 is a perspective view of a pressure vessel 100 according to the present embodiment, and FIG. 2 is a perspective view of an aluminum anode 200 used in the present embodiment.

  As shown in FIG. 1, a pressure vessel 100 according to the present embodiment is (1) a substantially rugby ball-shaped hollow container having a pressure resistance, and a substantially triangular flange portion 11 in which a through hole 11a is formed. A container body 10 made of ABS resin formed at four corners of the outer wall surface, and (2) the inside and the outside of the container body 10 fixed to one side of the outer wall surface of the container body 10 in communication or non-communication. A first opening / closing valve 20 that can be switched to a state; and (3) the container body 10 fixed to the other side of the outer wall surface of the container body 10, that is, the outer wall surface opposite to the fixing position of the first opening / closing valve 20. A second opening / closing valve 30 is provided that can switch the inside and the outside between a communication state and a non-communication state.

  Further, as shown in FIG. 1, the first on-off valve 20 includes (1) a substantially cylindrical valve base 21 that is fixedly penetrated to the container body and has an on-off valve (not shown) rotatably incorporated therein. (2) an opening / closing lever 22 for opening and closing the opening / closing valve provided rotatably on the valve base 21; and (3) a ring-shaped uneven portion disposed on the outer peripheral surface, which is arranged in communication with the tip of the valve base 21. Hose connecting end portions 23 formed alternately.

  By connecting the end portion of the hose 50 to the hose connection end portion 23 and tightening the connection portion with a metal hose band (not shown), the ring-shaped uneven portion bites into the inner peripheral wall surface of the hose 50 and comes off. It is the structure which fulfills the function of prevention. The hose 50 used in the present embodiment has a length of about 1 to 1.5 m.

  Similarly to the first opening / closing valve 20, the second opening / closing valve 30 has a valve base 21 and an opening / closing lever 22, but the second opening / closing valve 30 does not have the hose connection end 23 described above. This is different from the one open / close valve 20.

  In the present embodiment, in the sea, the first on-off valve 20 to which the hose 50 is connected is located closer to the sea surface, and the second on-off valve 30 to which the hose 50 is not connected is located far from the sea surface. As described above, the rope 60 for connecting to an aluminum anode 200 (see FIG. 2), which will be described later, is connected to the flange portions 11 formed on the left and right sides of the second opening / closing valve 30 via the through holes 11a ( (See FIG. 1).

  In the present embodiment, the force that the object to be transported in the sea (in this embodiment, for example, the aluminum anode 200) tries to sink, and the hollow pressure vessel 100 connected to the force tends to rise. In response to the difference in the weight of the object to be transported in the so-called neutral buoyancy state where the force to be canceled is not lifted nor sinks as a whole, water is not poured inside The type of the pressure vessel 100 is distinguished.

  For example, the pressure container 100 for 120 kg is connected to a transportation object having a weight in the sea of 120 kg as a result of subtracting the buoyancy received by the transportation object from the original weight of the transportation object, The container is in a neutral buoyancy state as a whole. Here, it is assumed that the volume in the sea of the pressure vessel 100 and the aluminum anode 200 as the object to be transported is not substantially changed.

  Further, in the present embodiment, the first on-off valve 20 and the second on-off valve 30 provided in the pressure vessel 100 reduce the force with which the pressure vessel 100 tries to rise by pouring water into the pressure vessel 100. Therefore, the selection of the pressure vessel 100 has a higher degree of freedom compared to the conventional case. That is, the pressure vessel 100 may be selected so that the pressure vessel 100 and the aluminum anode 200 connected to each other in the sea slightly sink as in the past, but on the contrary, the pressure vessel 100 becomes floating. Can also be selected, which increases the degree of freedom of selection. Here, the case where the latter is selected will be described.

  Here, the force with which the pressure vessel 100 tries to lift up is the force resulting from subtracting the total weight of the pressure vessel 100 (including the weight of the internal water) from the buoyancy that the pressure vessel 100 receives.

  Therefore, for example, the aluminum anode 200 having a weight of 150 kg has a weight of about 95 kg in the sea due to the buoyancy that the aluminum anode 200 receives. Therefore, the pressure container 100 for 120 kg described above is selected as the pressure container 100 connected thereto. Is done. The pressure vessel 100 connected to the aluminum anode 200 having a weight of 150 kg is not limited to the one for 120 kg. For example, a pressure vessel 100 that can be in a neutral buoyancy state even when connected to an object heavier than 120 kg is selected. Also good.

  Moreover, although FIG. 1 of this Embodiment demonstrated the case where the container main body 10 of the pressure-resistant container 100 comprised the substantially rugby ball shape as an example, it is not restricted to this, For example, the container main body 10 of the pressure-resistant container 100 May have a substantially spherical shape (see FIG. 3), or may have a substantially bowl shape, and the shape is not limited.

  Next, the aluminum anode 200 used in the present embodiment will be described mainly with reference to FIG.

  That is, as shown in FIG. 2, the aluminum anode 200 of the present embodiment includes (1) a substantially rectangular parallelepiped aluminum block 210 and (2) an iron pier 300 attached to the upper end surface of the aluminum block 210. (See FIG. 3) an upper grooved steel 220a for welding and fixing to the pier 310, and (3) a lower grooved steel 220b attached to the lower end surface of the aluminum block 210 for welding and fixing to the pier 310; 4) having a temporary fixing wire 230 for temporarily fixing the aluminum anode 200 by hooking a loop portion on a hook 311 wound around the upper channel steel 220a and fixed in advance at a predetermined position of the pier 310. Yes.

  Note that the first on-off valve 20 and the second on-off valve 30 of the present embodiment correspond to an example of two on-off valves of the present invention. The hose 50 of the present embodiment is an example of the hose member of the present invention.

  Next, a method for transporting the aluminum anode 200 in the sea using the pressure vessel 100 of the present embodiment will be described mainly with reference to FIG.

  FIG. 3 is a schematic diagram for explaining an underwater transportation method of the aluminum anode 200 using the pressure vessel 100, which is an embodiment of the underwater transportation method of the present invention.

  When the mounting position of the aluminum anode 200 is on the front side of the pier 310 in the foremost row of the pier 300, it is within the range in which the crane 400 can be operated. When it is suspended directly and lowered into the sea and reaches the pier portion at the target position, a diver (not shown) hooks the temporary fixing wire 230 of the aluminum anode 200 on the hook 311 in the sea (at the approximate center in FIG. 3). (Refer to aluminum anode 200). The welding and fixing of the aluminum anode 200 is performed in step 14 described later.

  Hereinafter, a case where the diver carries the aluminum anode 200 to the pier 310 on the back side below the pier 300 using the pressure vessel 100 will be described.

  In addition, it is assumed that the opening / closing lever 22 of the first opening / closing valve 20 and the opening / closing lever 22 of the second opening / closing valve 30 of the pressure vessel 100 are both set to the “closed” position.

  Here, as described above, in order to transport the aluminum anode 200 having a weight of 150 kg (weighing about 95 kg in the sea), the pressure vessel 100 to be connected uses one pressure vessel 100 for 120 kg.

  In addition, the aluminum anode 200 of this Embodiment corresponds to an example of the conveyance target object of this invention.

(1) Step 1:
First, the 120 kg pressure vessel 100 is put on the sea surface 90 (see FIG. 3).

(2) Step 2:
Next, after the aluminum anode 200 having a weight of 150 kg is lowered about 1 m below the sea surface using the crane 400, a diver near the sea surface 90 is attached with a carabiner 250 around the trunk of the aluminum anode 200. The torso winding rope 260 is wound, and the looped portions 60a of the two ropes 60 of the pressure vessel 100 are attached to the carabiner 250 (see FIG. 2).

(3) Step 3:
Then, the aluminum anode 200 is removed from the hanging wire 410 of the crane 400.

(4) Step 4:
In this case, as described above, since the pressure vessel 100 and the aluminum anode 200 connected to each other in the sea are in a slightly floating state as a whole, the diver connects the pressure vessel 100 and the aluminum anode 200 connected to each other to the sea surface 90. Is moved above the target position (see arrow A in FIG. 3).

(5) Step 5:
Next, by injecting seawater into the pressure vessel 100, the force that the aluminum anode 200 tries to sink and the force that the pressure vessel 100 connected to the aluminum vessel 200 tries to rise up balances, so that the neutral buoyancy as a whole. Adjust to be in the state.

  That is, the diver adjusts the open / close state of the open / close lever 22 of the upper first open / close valve 20 while keeping the open / close lever 22 of the lower second open / close valve 30 provided in the pressure vessel 100 open. By extracting the air, the amount of seawater entering from the second opening / closing valve 30 is adjusted to reduce the force with which the pressure-resistant vessel 100 tries to float up, and the neutral buoyancy state is obtained. Thereafter, the open / close levers 22 of the first open / close valve 20 and the second open / close valve 30 of the pressure vessel 100 are reliably rotated in the “closed” direction.

  In addition, by pouring seawater into the pressure vessel 100, the state is not limited to the neutral buoyancy state, but may be slightly submerged, for example.

(6) Step 6:
Then, the diver causes the pressure vessel 100 and the aluminum anode 200, which are in a neutral buoyancy state as a whole, to submerge to the target position (see the pressure vessel 100 and the aluminum anode 200 on the right side in FIG. 3, arrow B), The loop of the temporary fixing wire 230 attached to the aluminum anode 200 is hooked on the hook 311 fixed in advance to the pier and temporarily fixed, and the upper groove steel 220a and the lower groove steel 220b are assigned to predetermined positions on the pier 310. Carry out work. Thereby, since the attitude | position of the aluminum anode 200 is adjusted appropriately, the welding operation mentioned later can be performed smoothly.

(7) Step 7:
Next, the diver rotates the open / close lever 22 of the first open / close valve 20 on the upper side of the pressure vessel 100 in the “open” direction, and then opens the open / close lever 22 of the lower second open / close valve 30 in the “open” direction. Turn to. In addition, the diver puts the tip of the hose 50 having a total length of about 1.5 m, which is fixedly connected to the hose connection end 23 of the first opening / closing valve 20 on the upper side of the pressure vessel 100 in advance by a hose band (not shown). The air is lifted above the upper surface of the pressure vessel 100 by the hand, thereby promoting air venting in the pressure vessel 100 and injecting seawater from the open second opening / closing valve 30.

  The diver is in a state where the pressure vessel 100 is in a neutral buoyancy state (that is, a state in which the entire weight of the pressure vessel 100 including seawater is balanced with the buoyancy determined in proportion to the external volume of the pressure vessel 100). ), The first on-off valve 20 of the pressure-resistant vessel 100 and the on-off lever 22 of the second on-off valve 30 are rotated in the “closed” direction to stop water injection.

  Thereby, the pressure vessel 100 opens the first opening / closing valve 20 and the second opening / closing valve 30, injects seawater into the inside, and finally closes the opening / closing lever 22, so that the entire weight of the pressure vessel 100 containing seawater is contained. Then, the buoyancy determined by the weight of the seawater pushed away by the volume of the pressure vessel 100 is balanced, and the pressure vessel 100 alone becomes a neutral buoyancy state that does not rise and sink in the sea, and the rope 60 It stays in the sea while being hooked on the carabiner 250 through the sea (see FIG. 2).

  As described above, by lifting the tip of the hose 50 of the first opening / closing valve 20 as close to the sea surface 90 as possible and removing air, the water pressure applied to the air outlet of the hose 50 becomes lower as it approaches the sea surface 90. The removal of the water becomes faster, and the time for injecting seawater from the second opening / closing valve 30 can be significantly shortened compared to the case where the hose 50 is not used.

(8) Step 8:
Next, the diver removes the carabiner 250 that connects the pressure vessel 100 and the aluminum anode 200 from the body winding rope 260 wound around the body of the aluminum anode 200. Further, the body winding rope 260 is removed from the body portion of the aluminum anode 200 and attached to the carabiner 250 attached to the ring portion 60 a of the two ropes 60.

(9) Step 9:
The pressure vessel 100 can be freely moved to the sea level 90 in a state where the body winding rope 260 is attached to the carabiner 250 attached to the loop portion 60a of the two ropes 60.

  As described above, according to the underwater transport method of the aluminum anode 200 using the pressure vessel 100 of the present embodiment, the pressure vessel 100 opens the first on-off valve 20 and the second on-off valve 30 when the diver is underwater. Therefore, even if the connection with the aluminum anode 200 is removed, the pressure vessel 100 does not rise suddenly toward the sea surface 90, so that safer work can be performed. Demonstrate the effect that it can be realized.

  Further, when the pressure vessel 100 is brought into a neutral buoyancy state alone, the hose 50 connected to the hose connection end portion 23 of the first on-off valve 20 is not just opened on the upper on-off first on-off valve 20. By using the air to drain air, the water injection time can be greatly shortened and work efficiency is improved.

(10) Step 10:
Next, as described above, the diver moves the pressure vessel 100 to the sea level 90 and then the next aluminum anode 200 is already lowered by the crane 400 about 1 m below the sea level. The body winding rope 260 connected to the rope 60 of the pressure vessel 100 via the carabiner 250 is wound around the body portion of the body.

(11) Step 11:
Next, the diver puts compressed air into the inside of the pressure resistant vessel 100 to remove seawater.

  Specifically, the diver is supplied from a hose (not shown) connected to a compressor (not shown) disposed on the pier 300 on the sea by opening the second opening / closing valve 30 on the lower side of the pressure vessel 100. Compressed air is inserted into the pressure vessel 100 by inserting a nozzle (not shown) attached to the tip of the hose into the opening 21a (see FIG. 1) at the tip of the valve base 21 of the second on-off valve 30. To go. Since the upper first opening / closing valve 20 is closed, the seawater inside the pressure-resistant container 100 pushed by the compressed air is forcibly discharged into the sea from the opening 21a of the second opening / closing valve 30 and the nozzle. .

  Even if some seawater remains in the pressure vessel 100, it is sufficient that the seawater is removed to such an extent that the pressure vessel 100 and the aluminum anode 200 connected to each other in the sea are slightly floating as a whole.

(12) Step 12:
Since the aluminum anode 200 connected to the pressure vessel 100 from which the seawater has been discharged is slightly floating as a whole, the aluminum anode 200 is removed from the crane 400.

  (13) Thereafter, the above steps 4 to 12 are repeated, and after the final aluminum anode 200 is hooked to the hook 311 and temporarily fixed (see step 6), after the steps 7, 8, and 9 are performed, The pressure vessel 100 is suspended by the hanging wire 410 of the crane 400 in the sea, the above step 11 is performed, the seawater in the pressure vessel 100 is drained, and then the pressure vessel 100 is recovered by the crane 400 (step 13).

  Thereby, the temporary fixing work to the pier part about all the aluminum anodes 200 is completed.

(14) Step 14
Thereafter, the diver removes deposits such as shells attached to predetermined positions of the pier 310 to which the upper groove steel 220a and the lower groove steel 220b are addressed for all the aluminum anodes 200 temporarily fixed to the pier portion. After removing, the upper groove steel 220a and the lower groove steel 220b are firmly attached to the predetermined positions and fixed by welding (see FIG. 2).

  As described above, according to the undersea transportation method using the pressure vessel 100 of the present embodiment, an effect that safer and more efficient work can be realized as the cathodic protection method.

  In the above embodiment, the case where the pressure vessel 100 has a substantially rugby ball shape or a substantially spherical shape has been described. However, the shape is not limited to this, and may be, for example, a bowl shape. As long as it has one or a plurality of on-off valves and can open and close the open / close valves, the inside and outside of the pressure vessel can be switched between a communication state and a non-communication state. .

  In the above embodiment, the case where there is one pressure vessel 100 connected to the aluminum anode 200 is described. However, the present invention is not limited to this. For example, the pressure vessel 100 connected to the aluminum anode 200 is two or more. In short, if it is possible to realize a substantially neutral buoyancy state as a whole by connecting with the aluminum anode 200, or if it becomes slightly submerged as a whole, the number and types of pressure vessels 100 to be connected can be increased. It is not limited.

  Moreover, in the said embodiment, the case where the aluminum anode 200 as a sacrificial anode was conveyed with respect to the pier of the iron pier in the sea was demonstrated as an example of the underwater conveyance method of the conveyance target object using the pressure vessel of this invention. However, the present invention is not limited to this. For example, the object to be transported (for example, a sacrificial anode) may be transported in the sea or underwater to a ship, a port facility, a bridge, or the like using the pressure vessel 100. Even in this case, a safer work can be realized as described above.

  Moreover, in the said embodiment, in the said process 5, the 1st on-off valve 20 and the 2nd on-off valve 30 were utilized in the said process 5 as an example of the submerged conveyance method of the conveyance target object using the pressure vessel of this invention, and an aluminum anode. In the above description, the seawater is poured into the pressure-resistant vessel 100 connected to 200 to adjust to a neutral buoyancy state as a whole. However, the present invention is not limited to this. For example, the step 5 may be omitted. good. That is, by connecting to the aluminum anode 200, the neutral pressure buoyancy is selected from the beginning without water injection by selecting the pressure vessel 100 that is slightly submerged as in the past or by connecting to the aluminum anode 200. When the pressure vessel 100 to be in a state is selected, the above step 5 can be omitted. Even in this case, a safer operation can be realized as described above. Here, as an example of selecting the pressure vessel 100 that is in a neutral buoyancy state from the beginning without water injection, for example, to transport the aluminum anode 200 having a weight of 300 kg (weight in the sea is about 200 kg). As the pressure vessel 100 to be connected, there are cases where a total of two types of pressure vessel 100 of 120 kg and a pressure vessel 100 for 80 kg are selected.

  Moreover, in the said embodiment, as an example of the underwater conveyance method of the conveyance target object using the pressure vessel of this invention, the sea level 90 is made into the target position in the said process 4, the pressure vessel 100 and the aluminum anode 200 which were mutually connected. 3 (see arrow A in FIG. 3), and after step 5, the pressure vessel 100 and the aluminum anode 200 are submerged to the target position in step 6 (the pressure resistance on the right side in FIG. 3). The structure of the container 100 and the aluminum anode 200 (see arrow B) has been described. However, the present invention is not limited to this configuration. For example, when the pressure container 100 that is slightly submerged by being connected to the aluminum anode 200 is selected, or the aluminum anode 200 When the pressure vessel 100 that is in a neutral buoyancy state from the beginning without water injection is selected, the sea level 90 is moved above the target position. It is not, may be configured for moving the sea and directly toward the target position from the beginning.

  Moreover, in the said embodiment, the operation | work which hooks all the aluminum anodes 200 with respect to the hook 311 of the bridge pier 310 of an underwater iron jetty as an example of the underwater conveyance method of the conveyance target object using the pressure vessel of this invention. Although the case where the aluminum anode 200 is collectively welded and fixed (see step 14 above) after completion (see steps 1 to 13 above) has been described, the present invention is not limited to this. For example, the number of aluminum anodes 200 is one. If there are few cases, the aluminum anode 200 may be welded at each time after the aluminum anode 200 is temporarily fixed by hooking the aluminum anode 200 on the hook 311 of the pier 310 (see step 6 above). Alternatively, the first on-off valve 20 and the second on-off valve 30 may be opened to inject seawater into the pressure-resistant vessel 100 (see step 7 above) and be performed each time. Even in this case, a safer work can be realized as described above.

  Moreover, in the said embodiment, as an example of the underwater conveyance method of the conveyance target object using the pressure vessel of this invention, after the aluminum anode 200 is hooked on the hook 311 of the pier 310 and temporarily fixed, the aluminum anode 200 is collected. However, the present invention is not limited to this. For example, when the number of aluminum anodes 200 is one or small, the operation of hooking the aluminum anode 200 on the hook 311 is not performed. After removing the deposits at the welded portion of the pier 310, the upper groove steel 220a and the lower groove steel 220b are directed to predetermined positions of the pier 310, and then the upper groove steel 220a and the lower groove steel 220b are attached to the pier 310. After welding and fixing, the first on-off valve 20 and the second on-off valve 30 are opened, and seawater is poured into the pressure vessel 100 (see step 7 above). It may be better. This is effective when working in a place where there is little influence from tidal currents, or when the upper groove steel 220a and the lower groove steel 220b are only placed at predetermined positions on the pier 310 and can be positioned firmly. It is possible to omit the temporary fixing work. In that case, the hook 311 and the temporary fixing number 230 (see FIG. 2) are unnecessary. Even in this case, a safer work can be realized as described above.

  Moreover, although the said embodiment demonstrated the case where the aluminum anode 200 made from aluminum was used as a sacrificial anode in an electro-corrosion prevention construction method as an example of the conveyance target object of the underwater conveyance method using the pressure-resistant container of this invention, For example, zinc or another metal may be used as long as it is a metal that has a higher ionization tendency than a body to be protected (in the above embodiment, a pier of an iron pier).

  Moreover, although the said embodiment demonstrated the case where the aluminum anode 200 as a sacrificial anode in an anti-corrosion construction method was conveyed as an example of the conveyance target object of the underwater conveyance method using the pressure vessel of this invention, it is not restricted to this For example, as another example of the object to be transported, a concrete block, a wave-dissipating block, a wave height meter, or the like (not shown) may be used. In this case, a concrete block, a wave-dissipating block, or a wave height meter is transported to the seabed or lake bottom in a state connected to the pressure vessel 100 as described above, and is installed on the seabed or lakebed or the structure of the seabed or lakebed. Or after being installed, the first on-off valve 20 and the second on-off valve 30 are opened for a predetermined period of time to evacuate the air inside the pressure vessel 100 and inject water into the pressure vessel 100 to float by the pressure vessel 100. The force to be lifted is made smaller than before opening the first on-off valve 20 and the second on-off valve 30, the water-filled pressure-resistant container 100 is disconnected from the object to be transported, and the pressure-resistant container 100 that has been disconnected is removed. By transporting to the sea surface or lake surface, an artificial structure such as an artificial reef or an artificial island can be safely constructed. In this case, for example, when a precision device such as a wave height meter is installed on the structure on the seabed, the pressure vessel 100 and the wave height meter connected to each other are slightly floating as a whole, above the target installation position. When the diver operates the first on-off valve 20 and the second on-off valve 30 to inject seawater into the pressure-resistant vessel 100 when the sea level is on the sea level, the wave height meter is connected to the force The pressure vessel 100 is adjusted so as to balance with the force with which the pressure vessel 100 is lifted, so that a neutral buoyancy state is obtained as a whole (see step 5 above). Then, the diver causes the pressure vessel 100 and the wave height meter connected to each other to submerge to the target position, and slowly installs the pressure vessel at the target position, and further operates the first opening / closing valve 20 and the second opening / closing valve 30 to operate the pressure vessel. By pouring seawater into 100, the force to lift by the pressure vessel 100 is made smaller than before opening the first on-off valve 20 and the second on-off valve 30, and the pressure vessel 100 is brought into a neutral buoyancy state alone. Therefore, the connection with the pressure vessel 100 can be removed without giving an impact to the wave height meter. As a result, when a precision device such as a wave height meter is installed on a structure on the seabed, it is possible to perform a safer operation and to suppress an impact applied to the device when the precision device is installed or installed. Also effective.

  Moreover, in the said embodiment, in the state which connected the aluminum anode 200 as a conveyance target object with the pressure-resistant container 100 as an example of the conveyance target object of the underwater conveyance method using the pressure-resistant container of this invention, it is predetermined in the sea or underwater. By transporting to a position, hooking, fixing, installing or installing the object to be transported at a predetermined position, and opening the on-off valves (for example, the first on-off valve 20 and the second on-off valve 30) for a predetermined period, The air inside the pressure vessel is evacuated and water is poured into the pressure vessel, so that the force to lift by the pressure vessel is smaller than before opening the on-off valve, and the injected pressure vessel and the object to be transported Described the case where the diver performs the work of removing the connection with the object and transporting the pressure vessel which has been disconnected to the water surface, but not limited to this, for example, the above A small submarine operated by a human, equipped with a robot arm capable of performing the above-described various operations such as opening / closing a closed valve and releasing the connection between the pressure vessel and the object to be transported, The above-mentioned various operations may be performed by a remotely controlled unmanned small submersible craft equipped with a robot arm capable of performing the above-described various operations such as releasing the connection between the pressure vessel and the object to be transported. The subject of is not questioned. Even in this configuration, the pressure vessel can be prevented from rising rapidly toward the water surface, so there is no risk that the pressure vessel will crash into the small submersible or unmanned submersible or damage the robot arm. Therefore, safe work can be realized.

  In the above-described embodiment, the case where the pressure vessel 100 includes the first on-off valve 20 and the second on-off valve 30 has been described. However, the present invention is not limited to this. If water can be injected, the number of open / close valves may be one. Even in this configuration, the pressure vessel may be filled with water by opening and closing the opening / closing valve to be in a neutral buoyancy state, or the force with which the pressure vessel tries to rise may be smaller than before opening the opening / closing valve. Because you can, you can realize safer work.

  Moreover, in the said embodiment, although the case where the 1st on-off valve 20 and the 2nd on-off valve 30 protruded and attached from the pressure vessel 100 was demonstrated, not only this but as shown in FIG. As a different example, a concave portion 1120 that is partially recessed compared to the surroundings is formed at an upper and lower target position of an outer wall surface 1110 of a pressure vessel 1100, and the first opening / closing valve 20 and the second opening / closing valve are formed on the bottom surface 1121 of the recess 1120. 30 may be used so that the first opening / closing valve 20 and the second opening / closing valve 30 do not protrude from the outer wall surface 1110 of the pressure vessel 1100 as another example. According to this configuration, it is difficult for an external impact to be applied to the on-off valves (for example, the first on-off valve 20 and the second on-off valve 30), and the pressure vessel 1100 as another example is less likely to be damaged or the pressure resistance is not deteriorated. Further, since the opening / closing lever 22 is also disposed inside the recess 1120, there is no trouble that the opening / closing lever 22 opens and closes arbitrarily due to, for example, the rope 60 being entangled. FIG. 4 is a perspective view showing a configuration of a pressure vessel 1100 as another example.

  Moreover, in the said embodiment, in an underwater conveyance method using a pressure vessel, an example in the case of pouring water into the inside of a pressure vessel and making the force which is going to float by a pressure vessel smaller than before opening an on-off valve As above, the case where the pressure vessel 100 is put in a neutral buoyancy state alone has been described. That is, by opening the first opening / closing valve 20 and the second opening / closing valve 30 of the pressure vessel 100 and pouring seawater inside, and finally closing the opening / closing lever 22, the overall weight of the pressure vessel 100 containing seawater inside, The case where the buoyancy determined by the weight of seawater pushed away by the volume on the appearance of the pressure vessel 100 is balanced and the pressure vessel 100 is in a neutral buoyancy state in which it does not rise or sink in the sea has been described.

  However, this neutral buoyancy state can be explained as follows from another viewpoint.

  That is, when the first opening / closing valve 20 is opened with respect to the pressure vessel 100 and seawater is poured from the second opening / closing valve 30, the opening / closing lever 22 is in the “open” state. The injected seawater is connected to the outside seawater. Therefore, the buoyancy that the pressure vessel 100 receives in this state is generally the weight of seawater that the pressure vessel 100 pushes away, that is, the volume portion of the space occupied by the air remaining inside the pressure vessel 100 and the meat of the outer wall of the pressure vessel 100. It can be considered that it is determined by the weight of seawater corresponding to the total volume part occupied by the thickness. Based on this concept, when the pressure vessel 100 is in a neutral buoyancy state in which it does not float or sink in the sea, the original weight of the pressure vessel 100 without seawater inside and the buoyancy that the pressure vessel 100 receives above. Can be explained as being in a balanced state. In this case, the buoyancy received by the pressure vessel 100 with the open / close lever 22 in the “open” state is the same as that of the pressure vessel 100 in the hollow state before the open / close lever 22 rotates in the “open” direction. It can be said that it is smaller than the buoyancy received.

  Moreover, in the said embodiment, in an underwater conveyance method using a pressure vessel, an example in the case of pouring water into the inside of a pressure vessel and making the force which is going to float by a pressure vessel smaller than before opening an on-off valve As above, the case where the pressure vessel 100 is put in a neutral buoyancy state alone has been described. However, the present invention is not limited to this. For example, the first opening / closing valve 20 and the second opening / closing valve 30 of the pressure vessel 100 are opened, seawater is injected therein, and finally the opening / closing lever 22 is closed. The force generated as a result of subtracting the total weight of the pressure vessel 100 from the buoyancy determined by the weight of the seawater displaced by the volume of the pressure vessel 100, that is, the force that the pressure vessel 100 tries to lift is zero ( In other words, the pressure vessel may not be a neutral buoyancy state alone, in short, rather than before opening the on-off valve (for example, the first on-off valve 20 and the second on-off valve 30) and injecting seawater into the interior, What is necessary is just to make small the force which the pressure vessel 100 tries to float up. Even in this case, the force with which the pressure vessel 100 is lifted is smaller than that in the prior art, so even if the pressure vessel 100 rises toward the water surface, it can be slowly raised with a weaker force than before. Therefore, safer work than before can be realized. Further, when the diver moves the pressure vessel 100 to the sea surface 90, smooth movement to the sea surface 90 can be achieved by using the force with which the pressure vessel 100 is lifted.

  According to the pressure vessel of the present invention and the underwater transport method using the same, the effect that a safer work can be realized is exhibited, and the pressure vessel and the underwater transport method using the same are useful.

DESCRIPTION OF SYMBOLS 10 Container main body 11 Flange part 20 1st opening / closing valve 21 Valve base part 22 Opening / closing lever 23 End part 30 for hose connection 2nd opening / closing valve 50 Hose 60 Rope 100 Pressure vessel 200 Aluminum anode 300 Pier 310 Bridge pier 400 Crane 1100 container

Claims (2)

An underwater transport method for transporting an object to be transported in water using a pressure vessel provided with one or more open / close valves on an outer wall,
Transport the pressure vessel and the object to be transported to a predetermined position in the water in a connected state,
At the predetermined position, the transport object is hooked, fixed, installed, or installed,
By opening the on-off valve for a predetermined period, the air inside the pressure-resistant container is evacuated and water is injected into the pressure-resistant container, and the force to lift by the pressure-resistant container is smaller than before opening the on-off valve. And
Remove the connection between the injected pressure vessel and the object to be transported,
Transport the pressure vessel that has been disconnected to the surface of the water,
An underwater transportation method characterized by that. There are two on-off valves, which are provided on opposite sides,
The underwater transport method according to claim 1, wherein an air bleeding hose having a predetermined length is connected to a front end side of the opening / closing valve located closer to the water surface.

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