JP3752287B2 - Antifouling wall structure of tubular structure and construction method of the antifouling wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antifouling wall structure for a tubular structure and a method for constructing the antifouling wall. Specifically, for example, a shell or seaweed is provided on the inner wall surface of a tubular structure made of concrete or steel plate built in seawater. The present invention relates to an antifouling wall structure of a tubular structure for preventing the attachment of marine organisms and a method for constructing the antifouling wall.
[0002]
[Prior art]
A large number of animal and plant attachment organisms such as barnacles, cell plastics, blue mussels, oysters, chrysanthemum beetles, squirts, aonori and aosa are in the sea. If these marine organisms attach to and grow on, for example, cooling water intake pipes of thermal power plants, nuclear power plants and other coastal plants installed in the sea, various damages occur. As an example, when marine organisms such as the above adhere to the cooling water intake pipe of a power plant and grow, the flow resistance of the seawater for cooling increases, resulting in a decline in the function of the heat exchanger and adversely affecting power generation efficiency. .
[0003]
In order to avoid such a situation, various antifouling paints have been previously applied to the inner wall surface of the tubular structure in advance, and if necessary, the intake of cooling water is temporarily stopped and marine organisms are removed by divers. I was doing.
[0004]
[Problems to be solved by the invention]
However, even if the diver is removed directly, there is too much marine organisms attached, and it is necessary to carry out the removal work a considerable number of times, and it has not yet been fully solved.
[0005]
Further, the cooling water intake pipe is usually located at a depth of 6 to 10 m, and it is difficult to apply the antifouling paint because it cannot be in a dry environment.
As another method for constructing an antifouling wall, a method described in Japanese Patent Application Laid-Open No. 55-500863 (“Preventing marine structure fouling”) is already known, and this method is used as a cooling water intake pipe. Or it is difficult to apply to a drain pipe.
[0006]
The present invention has been made in view of the above problems, and has a tubular structure antifouling wall structure capable of preventing as much as possible marine organisms such as shellfish from adhering to a tubular structure constructed under the sea surface. It aims at providing the construction method of the antifouling wall.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the antifouling wall structure of the tubular structure according to the present invention is:
An antifouling wall structure of an annular structure in which an antifouling panel composed of a plurality of divided bodies made of synthetic resin is detachably attached to the inner wall surface of a tubular structure for flowing a fluid such as seawater,
The abutment portion between at least one end of the divided body arranged on one side and the divided body arranged on the other side is detachably fixed by a plate-like locking tool extending in the fluid flow direction. it is characterized in that that.
[0008]
Here, the division body of the antifouling panel includes a first division body arranged on the ceiling portion of the tubular structure and a second division body arranged on one side of the first division body. And a third divided body arranged on the other side.
[0009]
Moreover, it is preferable that the contact part of the edge parts of the said 2nd division body and the 3rd division body is detachably fixed by the plate-shaped locking tool extended in the fluid flow direction.
Furthermore, the antifouling wall construction method according to the present invention for achieving the above object is as follows:
Method for constructing antifouling wall of tubular structure for constructing antifouling wall on inner wall surface of tubular structure by detachably attaching antifouling panel made of three synthetic resin parts to inner wall surface of tubular structure Because
A step of lifting one divided body to be placed on the ceiling portion of the tubular structure by an air bag under the surface of the water and pressing it against the ceiling portion;
The other two divided bodies are applied to both sides of the divided body arranged on the ceiling portion, and an extension jig whose width can be adjusted is passed between the joint portions of the other two divided bodies. Contacting the body with the inner wall surface of the tubular structure;
A step of interposing a baffle plate in place of the expansion jig in order to maintain a constant distance between the joints between the two divided bodies arranged on both sides;
And a step of detachably fixing between the joint portions of the two divided bodies on which the baffle plates are arranged with a plate-like locking tool extending in the fluid flow direction.
[0010]
[Action]
According to the present invention having the above configuration, the antifouling panel is constituted by the divided body, so that it is easy to carry into the seawater and the antifouling wall is constructed on the inner wall of the already constructed tubular structure. It is possible to go.
[0011]
Here, if the divided body is constituted by the first divided body arranged on the ceiling portion and the second divided body and the third divided body arranged on both sides thereof, the panel is constituted by a small number of steps. Can do. Moreover, since the 1st division body arrange | positioned at a ceiling part can be floated upwards, the attachment operation | work of another division body can be performed with the state.
[0012]
Further, since the two divided bodies are detachably fixed by the plate-shaped locking tool, the divided bodies can be easily assembled and disassembled while keeping the separation distance constant.
Furthermore, according to the above method, workability under the water surface is good, and the panel formed of the divided body can be easily and reliably fixed to the inner wall surface of the tubular structure.
[0013]
【Example】
Hereinafter, an antifouling wall structure of a tubular structure according to the present invention and a method for constructing the antifouling wall will be described with reference to the drawings.
[0014]
FIG. 1 shows an example in which an antifouling wall structure according to an embodiment of the present invention is newly added to a cooling water intake pipe of a thermal power plant that has already been built and operated in seawater. .
[0015]
The cooling water intake pipe 1 of this thermal power plant constitutes an outer ring in the figure, but is installed at a water depth of about 10 m, has an inner diameter of 1900φ, and an overall length of about 400 m. Usually, the cooling water intake pipe 1 which is such a tubular structure is constructed from a steel plate or concrete.
[0016]
An antifouling panel 2 is attached to the inner peripheral surface of the cooling water intake pipe 1 in order to prevent the marine organisms from adhering to the inner surface of the fluid. It is done.
[0017]
The antifouling panel 2 is made of a synthetic resin such as FRP having an antifouling coating applied on the surface, and is composed of concentric divided bodies such as three or four as shown in FIG. Has been. The antifouling panel 2 of the embodiment is an example of a three-part divided body. The first divided body 3 (upper panel), the second divided body 4 (side panel), and the third divided body 5 ( Side panel). These divided bodies are required to have a resistance to fluid and an appropriate self-holding force, and preferably have a thickness of about 10 mm to 20 mm.
[0018]
Further, a shoulder A that is a connecting portion between the first divided body 3 and the second divided body 4, and a shoulder B that is a connecting portion between the first divided body 3 and the second divided body 5, Each is assembled in the same structure, details are shown in FIG. That is, the first, second, and third divided bodies are each formed in a substantially arc shape, but one end portion 4a of the second divided body 4 and one of the third divided bodies 5 are formed. The fitting piece 6 is integrally attached to the end portion 5a. These fitting pieces 6 may be integrally formed with the second divided body 4 and the third divided body 5, but those formed separately as shown in FIG. It may be fixed.
[0019]
On the other hand, the bottom C, which is a joint between the second divided body 4 and the third divided body 5, is assembled as shown in FIGS.
That is, the bottom C, which is a joint between the other end 4b of the second divided body 4 and the other end 5b of the third divided body 5, is formed separately from a synthetic resin such as rubber or FRP. It is detachably fixed via a plate-like locking tool 8.
[0020]
The plate-like locking tool 8 is elongated and arranged in a strip shape in the fluid flow direction, and is fixed by screwing a retaining nut 9 and a bolt 10 as will be described later.
Hereinafter, the operation in the case of actually installing the antifouling panel 2 on the inner wall surface of the cooling water intake pipe 1 already constructed under the water surface will be described in detail.
[0021]
Now, the cooling water intake pipe 1 is formed from a steel plate. In addition, on the inner surface, an anticorrosion zinc plate is already installed at an appropriate location.
In order to newly install the antifouling panel 2 on the cooling water intake pipe 1, first, the diver removes marine organisms from the cooling water intake pipe 1, and the zinc plate for electrocorrosion protection is once removed.
[0022]
When this operation is performed, the retaining nut 9 is welded to the bottom surface on the inner peripheral side of the cooling water intake pipe 1 as shown in FIGS. 4 and 5. A plurality of such retaining nuts 9 are installed in the cooling water intake pipe 1 at a predetermined interval in the fluid flow direction. And what is necessary is just to fix the said zinc plate later via the retaining nut 9 of a suitable position.
[0023]
When the operation of welding the retaining nut 9 is completed, the first divided body 3 (upper panel) disposed on the ceiling is carried below the water surface, and as shown in FIG. Is lifted to the upper part of the cooling water intake pipe 1 by using the buoyancy of the air bag 11. And this 1st division body 3 is made to float until completion of attachment work.
[0024]
Subsequently, the two side panels, that is, the second divided body 4 and the third divided body 5 are assembled to the side of the first divided body 3. Since the fitting pieces 6 and 6 are attached to one end portions 4a and 5a of the second divided body 4 and the third divided body 5, the projections of the fitting pieces 6 are used to What is necessary is just to match the both ends of 1 division body 3 respectively as shown in FIG. Thereby, the three division bodies 3, 4, and 5 can be assembled | attached cyclically | annularly. However, yet since three binding force between the divided body is weak, 'it is prepared, but this expansion tool 11' extended jig 11 that is possible width adjustment as shown in FIG. 6 the second divided body of 4 and the other end 5b of the third divided body 5, and then the baffle plate 22 is installed.
[0025]
Hereinafter, an operation for attaching the baffle plate 22 using the extension jig 11 ′ will be described. After the three divided bodies are incorporated into the inner wall of the cooling water intake pipe 1, the previously prepared extension jig 11 is connected to the other end 4b of the second divided body 4 and the third end as shown in FIG. The other end portion 5b of the divided body 5 is interposed between them. Then, by operating the nuts 12 and 12 of the extension jig 11 ′ , the central tongue pieces 13 and 13 are moved in the left-right direction, and the space between the end 4 b and the end 5 b is expanded. Thereby, the 2nd division body 4 and the 3rd division body 5 contact | abut each edge part of the 1st division body 3 without a clearance gap, respectively. At the same time, the first, second and third divided bodies 3, 4, 5 are in close contact with the inner peripheral surface of the cooling water intake pipe 1. Since the extension jig 11 ′ is removed later, the second divided body 4 and the third divided body 5 do not approach each other with the extended jig 11 ′ removed, as shown in FIG. The baffle plate 22 having the hole 22a is sandwiched between the retaining nuts 9 in the gap. Thereby, the gap | interval D between edge parts is maintained constant.
[0026]
Thus, when the plurality of baffle plates 22 are sandwiched between the second divided body 4 and the third divided body 5, the expansion jig 11 is removed. Thereafter, the gap D is kept constant by the baffle plate 22.
[0027]
Subsequently, between the other end 4 b of the second divided body 4 and the other end 5 b of the third divided body 5, an elongated plate-like locking tool 8 is arranged in the fluid flow direction. Note that the length of the plate-like locking tool 8 is substantially equal to the length of the divided body, and it is preferable to form long holes at predetermined intervals so that the bolts 10 can be inserted into the retaining nut 9. .
[0028]
When the plate-like locking tool 8 is arranged, the bolts 10 are screwed into the retaining nuts 9, respectively, so that the other end 4b of the second divided body 4 and the other end 5b of the third divided body 5 Are held so that they cannot move.
[0029]
In this way, the assembly of the antifouling panel as one constituent unit composed of the first divided body 3, the second divided body 4, and the third divided body 5 is completed in the cooling water intake pipe 1. Become.
[0030]
For example, when assembling an antifouling panel composed of three divided bodies into a cooling water intake pipe as long as 400 m, a large number of panel units 20 as the above-described structural units are required. A large number of items are prepared and assembled in order.
[0031]
At this time, the positions of the joint portions such as the shoulder portions A and B and the bottom portion C may be slightly shifted between adjacent panel units. Further, if antifouling paint is applied to the gaps generated between the panel units and at the joints of the divided bodies, it is possible to further prevent the attachment of marine organisms.
[0032]
Moreover, what is necessary is just to insert the cyclic | annular coupling tool 21 between the panel units 20 and 20 arrange | positioned in the flow direction of a fluid, as shown, for example in FIG. The connector 21 is made of an appropriate synthetic resin such as synthetic rubber or FRP. By preparing a large number of such annular couplers 21, the panel units 20 and 20 can be coupled annularly.
[0033]
In order to ensure work safety, when the existing cooling water intake pipe 1 reaches several hundred meters, it is preferable to provide an air stage, for example, every 50 m in the cooling water intake pipe 1. Moreover, it is good to work in the state which released the manhole with which the cooling water intake pipe 1 was equipped.
[0034]
As described above, the antifouling panel 2 made of synthetic resin can be safely and easily installed in the cooling water intake pipe 1 already constructed under the surface of the water. And after completion | finish of attachment construction, if the predetermined period which can prevent adhesion of marine organisms passes, these should just be removed and the antifouling panel which consists of another division body should just be attached. The removed panel can be reused.
[0035]
In addition, as a tubular structure targeted in the present invention, in addition to a cooling water intake pipe of a thermal power / nuclear power plant or other coastal plant, a tubular structure installed in the sea such as a drain pipe, a submarine pipeline, etc. Is a tubular structure installed in fresh water.
[0036]
Specific examples of the material of the divided body of the antifouling panel 2 used in the present invention include vinyl chloride, polyolefin (polyethylene, polypropylene), methyl methacrylate, polycarbonate, FRP (glass fiber reinforced plastics), CRP ( Hard plates such as carbon fiber reinforced plastics) or films such as vinyl chloride, polyolefin, vinylidene chloride can be used.
[0037]
Moreover, in the said Example, although the example which comprises an antifouling wall in the existing tubular structure was shown, of course, it can apply also to a novel tubular structure. Also in that case, the antifouling panel is detachably installed on the inner wall of the tubular structure.
[0038]
Moreover, in the said Example, although the cooling water intake pipe 1 showed the example formed from the steel plate, of course, you may consist of a cooling water intake pipe formed from concrete. In this case, the divided body can be fixed to the cooling water intake pipe 1 made of concrete by driving a chemical anchor instead of welding the retaining nut.
[0039]
Further, the shape of the extension jig 11, the shape of the fitting piece 6, the shape of the baffle plate 12, and the like are not limited to the embodiments.
[0040]
【The invention's effect】
As described above, according to the antifouling wall structure of the tubular structure according to the present invention, since the antifouling panel formed separately is attached to the inner wall surface of the tubular structure, Whether an existing cooling water intake pipe or a new cooling water intake pipe is configured to have an antifouling wall, the antifouling wall can be constructed easily and at low cost. Moreover, since this antifouling wall can be removed, it can be removed as necessary and used alternately with other antifouling panels.
[0041]
Therefore, for example, in order to perform antifouling treatment on the water contact surface of a cooling water intake pipe of a thermal power plant, it has been conventionally necessary to remove marine organisms in a relatively short period of time. The removal period can be set longer, and the antifouling panel that has lost its antifouling effect can be replaced with a new antifouling panel.
[0042]
Further, according to the present invention, the antifouling panel is formed from a divided body, so that it is easy to manufacture and carry.
Furthermore, according to the method for constructing an antifouling wall according to the present invention, an antifouling wall can be formed from a small number of divided bodies into a tubular structure, and the divided bodies arranged on the ceiling part can be floated under the surface of the water. Therefore, the mounting workability is good. In addition, when the panel is attached or removed from the tubular structure, the plate-like locking tool only has to be detached, so that the disassembly and assembling work is easy.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of a cooling water intake pipe of a thermal / nuclear power plant adopting an antifouling wall structure of a tubular structure according to the present invention.
2 is an exploded front view of the antifouling panel used in FIG. 1. FIG.
FIG. 3 is an enlarged perspective view showing a part A of FIG. 1;
4 is an enlarged cross-sectional view of a portion C in FIG. 1. FIG.
FIG. 5 is a schematic view for explaining one process of the work adopted in the method for constructing an antifouling wall according to the present invention.
FIG. 6 is a cross-sectional view illustrating another state of use of the extension jig, which is another step of the work employed in the method for constructing the antifouling wall according to the present invention.
FIG. 7 is a plan view for explaining a use state of the extension jig employed in the method for constructing the antifouling wall according to the present invention.
FIG. 8 is a perspective view illustrating a connection state between panel units according to an embodiment of the present invention.
[Explanation of symbols]
1 Cooling water intake pipe (tubular structure)
2 Antifouling Panel 3 First Divided Body 4 Second Divided Body 5 Third Divided Body 4a, 5a One End 4b, 5b The Other End 8 Plate-shaped Locking Tool 10 Expansion Jig 22 Baffle Plate

Claims (4)

An antifouling wall structure of an annular structure in which an antifouling panel composed of a plurality of divided bodies made of synthetic resin is detachably attached to the inner wall surface of a tubular structure for flowing a fluid such as seawater,
The abutment portion between at least one end of the divided body arranged on one side and the divided body arranged on the other side is detachably fixed by a plate-like locking tool extending in the fluid flow direction. antifouling wall structure of the tubular structure, characterized in that that. The divided body of the antifouling panel includes a first divided body disposed on the ceiling portion of the tubular structure, a second divided body disposed on one side of the first divided body, and the other. The antifouling wall structure for a tubular structure according to claim 1, wherein the antifouling wall structure is composed of a third divided body arranged on the side. The contact portion between the end portions of the second divided body and the third divided body is detachably fixed by a plate-like locking tool extending in the fluid flow direction. The antifouling wall structure for a tubular structure according to claim 2. Method for constructing antifouling wall of tubular structure for constructing antifouling wall on inner wall surface of tubular structure by detachably attaching antifouling panel consisting of three divided parts made of synthetic resin to inner wall surface of tubular structure Because
A step of lifting one divided body to be arranged on the ceiling portion of the tubular structure by an air bag under the surface of the water and pressing it against the ceiling portion;
The other two divided bodies are applied to both sides of the divided body arranged on the ceiling portion, and an extension jig whose width can be adjusted is passed between the joint portions of the other two divided bodies. Contacting the inner wall surface of the tubular structure;
A step of interposing a baffle plate in place of the expansion jig in order to maintain a constant distance between the joints between the two divided bodies disposed on both sides;
An antifouling wall for a tubular structure, comprising: a step of detachably fixing a joint between two divided bodies on which the baffle plate is arranged with a plate-like locking tool extending in a fluid flow direction. Construction method.

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