JP4959383B2 - Apparatus and method for repairing minute defects in water tank liner - Google Patents

Description

  The present invention relates to a lining material lined on the inner peripheral side of an open container that functions as a water tank, more specifically, a microdefect in a lining material of a fuel storage water tank in a nuclear power plant, using an underwater curable adhesive composition. The present invention relates to a micro defect repair device, a micro defect repair method, and a repair body that are repaired under water.

The fuel storage tank in the nuclear power plant is a large tank with a depth of about 12m and a width and length of 10-20m each, with the upper part located at a depth of about 8m. A fuel storage rack is arranged, and water is stored almost completely for safe storage of fuel.
Such a water tank is formed by bonding a lining material made of stainless steel or the like on the foundation surface of the concrete (lining). However, during use for many years, the lining agent that delimits the inner wall surface of the water tank is damaged. Since this may lead to further deterioration, damage, etc., repair is necessary.

However, in the case of draining and storing large tanks for repair work, in addition to the problem that it costs a lot of money, it is not safe to immerse the fuel in water like a fuel storage tank. Water tanks that are essential requirements must have preliminary facilities for temporary transfer to other water tanks.
Moreover, it is dangerous for an operator to dive for a long time in the water tank described above, and there is a problem that work in water has a longer time than work on land.

In view of such a situation, an invention for repairing the inner surface of a water tank as in Patent Document 1 has been proposed. According to patent document 1, the repair method in case an operator enters the inside of a water tank and repairs is proposed. This is for a sewage layer in a sewage treatment plant and is a method of performing local drainage in a water tank.
Specifically, the shelter is submerged in the bottom of the aquarium to be repaired in the aquarium, a water stop material is provided at the lower opening edge of the duct, and the water accumulated during the shelter subsidence is drained from the shelter, This is a method of securing an airborne area in a part of the inside.

Patent Document 2 proposes an underwater adhesive composition used for repairing the lining material in a water tank having a structure in which a lining material made of stainless steel or the like is provided on a concrete base surface.
This underwater adhesive composition is characterized by comprising a two-component underwater adhesive and a radiation-resistant additive. As the radiation-resistant additive, it is preferable to blend an aromatic amine-based additive for improving radiation resistance. Specifically, it is preferably at least one compound selected from the group consisting of modified aromatic polyamines such as diethyltoluenediamine, metaxylenediamine, and mensendiamine. In addition, a boron-based additive for improving the neutron-resistant property is also used. As the boron-based additive, at least one compound selected from the group consisting of boron carbide, boron oxide, boron nitride, boron anhydride, iron borate, orthoboric acid and metaboric acid is suitable. Furthermore, it is described that both the amine-based additive and the boron-based additive are blended.
Examples of the main component of the two-component underwater adhesive include bisphenol type epoxy resins such as bisphenol A type epoxy resins and novolac type epoxy resins. On the other hand, the curing agent is at least selected from the group consisting of amines or polyamines such as polyamide amine, modified polyamide amine, modified polyamide polyamine, modified aliphatic polyamine, modified aromatic polyamine, heterocyclic polyamine, and modified alicyclic polyamine. One curing agent is preferred. It is described that the underwater adhesive composition described in Patent Document 2 can be applied not only as a coating layer but also as an adhesive for a coating plate against a defective portion.

JP 2002-061279 A JP 2003-155466 A

However, in the invention described in Patent Document 1, in the water tank that stores sewage, chemicals, and the like, the installed shelter is contaminated, so it cannot be repaired immediately after the shelter is installed. In addition, there is a problem that the water tank must be drained locally, but an operator has to enter the tank to work. Furthermore, Patent Document 1 does not disclose the repair of minute defects, and the repair location is limited to the bottom of the water tank.
On the other hand, Patent Document 2 only discloses an underwater adhesive composition, and a specific repair method for repairing a water tank liner having a structure in which a stainless steel liner is provided on a concrete base surface is as follows. Not proposed.

In the method of repairing minute defects in the lining material lined on the inner peripheral side of the open container that functions as a water tank using an underwater curing type adhesive, there is no need for work that involves the danger of workers entering the water tank. It is required to repair underwater.
Furthermore, in more detail, in the micro defect repair method in which micro defects on the lining material of the fuel storage tank in a nuclear power plant are repaired underwater using an underwater curable adhesive, the micro defect is only in the plane portion of the tank lining material. In addition, it must be considered that a three-dimensional structure is present in the vicinity of the minute defect.
Furthermore, when the coated underwater adhesive composition floats in the water tank before uncured and is exposed to a high temperature environment such as a fuel storage tank, it is included in the epoxy resin that is the main component of the underwater adhesive composition. Chlorine (Cl) is unlikely to elute due to chemical changes, but it cannot be denied that it is not eluted at all, and the possibility of corrosion of the lining material is also possible, so repairing micro defects in the tank lining material underwater There is a need for better equipment development.
Therefore, in view of the above-mentioned problems of the prior art, the present invention is a lining material lined on the inner peripheral side of an open container that functions as a water tank, more specifically, a minute defect in the lining material of a fuel storage tank in a nuclear power plant, It is an object of the present invention to provide a micro defect repair device and repair method that can be easily repaired underwater using an underwater curable adhesive composition and that prevents the underwater curable adhesive composition from being scattered. .

The present invention achieves such an object, and in the micro defect repairing apparatus for repairing micro defects of the lining material lined on the inner peripheral side of the water tank under water using an underwater curing type adhesive,
A filling nozzle for feeding an underwater curable adhesive composition;
An extension nozzle connected to the nozzle tip;
In a state where the open surface is in contact with the wall surface of the lining material, a partition body in which a recessed space surrounding the repair surface around the minute defect of the lining material is formed,
An opening for inserting an extension nozzle to which the filling nozzle is attached on the upper surface of the partition in the direction of gravity;
An underwater curable adhesive composition, wherein an extension nozzle connected to the filling nozzle is inserted into the recessed space in the compartment from the opening, and is fed into the recessed space in the compartment through the extended nozzle; With
According to a first aspect of the present invention, the filling nozzle in which the adhesive plastic material and the extension nozzle are connected is allowed to stand until the adhesive composition is cured after the adhesive plastic material is filled into the recessed space. After the cured adhesive composition is cured, the extension nozzle is cut, and the extension nozzle is left in the filled solidified body of the adhesive composition .
According to a second aspect of the present invention, an extension nozzle connected to the filling nozzle is inserted into the recessed space in the compartment from the opening, and the tip of the extended nozzle is provided in contact with the bottom of the recessed space. An underwater curable adhesive composition that is fed into the recessed space in the compartment through the extension nozzle,
The filling nozzle in which the adhesive plastic material and the extension nozzle are connected is characterized in that the filling nozzle is pulled out while the extension nozzle is connected before the underwater curable adhesive composition is cured .

ADVANTAGE OF THE INVENTION According to this invention, it is possible to repair easily the micro defect of the water tank liner material underwater using an underwater hardening type adhesive composition. That is, by forming a partition section surrounding the periphery of the minute defect, the underwater curable adhesive composition is cured in close contact with the minute defect, thereby preventing leakage.
Furthermore, since the compartment prevents scattering of the filled underwater curable adhesive composition, even when chlorine (Cl) elutes from epoxy resin or the like when exposed to high temperature, it does not float in the water and corrodes the lining material. And can be suitably applied even in a high temperature environment such as a fuel storage tank.

In addition, when the minute defect of the tank lining material is on the side surface of the tank lining material, the surface opposite to the open surface in contact with the side surface faces the repair surface around the minute defect through the space. a facing surface, the periphery of the facing surfaces, partition body partitioned by belt-shaped side wall portion in contact with the lining material side is disposed, said partition body top surface makes with the insertable opening of the filling nozzle It is characterized by.
Furthermore, when the micro defect of the water tank liner is on the bottom surface of the water tank liner,
The partition body is a partition body in which a recessed space surrounding a repair surface around a micro defect and a micro defect located on the bottom surface of the water lining material is formed, and the partition body has a belt-like shape at a portion in contact with the bottom surface of the lining material side walls are formed surrounding said repair surface, a bottom surface above the open space of the water tank lining material, characterized in that it is an opening that the filling nozzle through the extension nozzle is inserted.
In this way, the shape of the repair surface where micro defects are present is different, so it is possible to easily repair even if there is a three-dimensional structure in the aquarium by selecting a partition body that matches the shape. is there.

In addition, the tip of the extension nozzle and the bottom of the recess space are provided in contact with each other, and an adhesive composition outlet opening is formed on a side surface of the tip of the extension nozzle .
Thereby, it becomes possible to pull up the filling nozzle from the water without spraying the water-curable adhesive composition into the water.

As this, the surrounding small defects can contact filled with water-curable adhesive composition, it is possible to repair the minute defects cured filling.

Moreover , this can prevent generation of water bubbles when the underwater curable adhesive composition is filled, and the adhesive composition is filled without involving water bubbles. That is, the repair of minute defects becomes stronger.

According to this invention, when the extension nozzle has an opening at the tip, the tip of the filling nozzle may be provided separately from the bottom of the recess space .
Thus, by selecting the position and shape of the tip of the filling nozzle or extension nozzle from the shape of the repair surface where micro defects exist, the filling time can be reduced and the adhesive composition can be filled uniformly. .

Further, according to the invention, the water tank is a fuel storage water tank in a nuclear power plant, and the underwater curable adhesive composition is a two-component underwater curable adhesive or the underwater curable adhesive. Adhesive This product is characterized in that it contains a radiation-resistant additive.
Thus, by mix | blending a radiation-resistant additive, the underwater hardening type adhesive composition which can maintain the radiation-resistant characteristic after repair favorably can be provided low.

In addition, as a method invention, in the micro defect repair method of repairing underwater using a submerged curable adhesive, microdefects of the lining material that is lined on the inner peripheral side of the open container that functions as a water tank,
An extension nozzle is connected to the tip of the filling nozzle for feeding the underwater curable adhesive composition,
On the other hand, in a state where the open surface is in contact with the wall surface of the lining material, prepare a partition body in which a recessed space surrounding the repair surface around the minute defect of the lining material is formed,
An opening into which a filling nozzle for feeding an underwater curable adhesive composition can be inserted is provided at an upper position in the gravitational direction of the compartment, and the underwater curable adhesive composition is fed from the opening through an extension nozzle. Enter
In the first invention, after the adhesive plastic material is filled into the recessed space, the adhesive composition is left to be cured, and after the left adhesive composition is cured, the extension nozzle is cut. An extension nozzle is left in the solidified body of the adhesive composition .
In the second invention, an extension nozzle is connected to the tip of the filling nozzle for feeding the underwater curable adhesive composition,
On the other hand, in a state where the open surface is in contact with the wall surface of the lining material, prepare a partition body in which a recessed space surrounding the repair surface around the minute defect of the lining material is formed ,
Provided at the upper position in the gravity direction of the compartment is an opening into which a filling nozzle for feeding the underwater curable adhesive composition can be inserted, and an extended nozzle is provided in contact with the bottom of the compartment from the opening. , Feeding the underwater curable adhesive composition through the extension nozzle ,
The adhesive plastic material and the filling nozzle are characterized in that the filling nozzle is pulled out while the extension nozzle is connected before the underwater curable adhesive composition is cured .

Also in the case having an opening at the distal end of the extension nozzle, tip of the extension nozzle is provided apart from the concave space bottom, adhesive compositions said derived from the nozzle tip openings adhesion of the minute defects The concave space is filled while being laminated from the lower part to the upper part.

Also of al, the bottom of the tip and the concave space of the filling nozzle or extension nozzle when provided in contact with, to form a side outlet opening of the adhesive composition on the tip side of the filling nozzle or extension nozzle, The concave space is filled while being laminated from the side lead-out opening toward the minute defect side from the concave space bottom.
Thereby, the same effect as the above-described device invention can be obtained.

As described above, in the present invention, it is possible to easily repair minute defects of the lining material lined on the inner peripheral side of the water tank underwater using an underwater curable adhesive composition. That is, by forming a partition section surrounding the periphery of the minute defect, the underwater curable adhesive composition is cured in close contact with the minute defect, thereby preventing leakage. Moreover, since the said division body prevents scattering of the filled underwater curable adhesive composition, corrosion of a lining material can be prevented and it can be applied suitably also in a high temperature environment like a fuel storage water tank.
Furthermore, since the shape of the repair surface in which a micro defect exists is different, it can be easily repaired even if it has a three-dimensional structure in a water tank by selecting the division body according to the shape.
Furthermore, the filling time can be reduced by selecting the position and shape of the tip of the filling nozzle or the extension nozzle from the shape of the repair surface where the minute defect exists. And generation | occurrence | production of a water bubble can be prevented when filling an underwater curable adhesive composition, and it can carry out without involving a water bubble in filling of an adhesive composition.
In addition, the extension nozzle connected to the filling nozzle is cut after the underwater curable adhesive composition is cured, so that the filling nozzle can be lifted from the water without being sprayed into the water. is there.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.
FIG. 1 is a schematic view of a minute defect repairing apparatus according to a first embodiment of the present invention, FIG. 2 is a diagram for explaining a partition section body and an extension nozzle according to the first embodiment of the present invention, and FIG. 4 is a schematic view of a defect repairing device, FIG. 4 is a perspective view showing a partition section body and an extension nozzle of Example 2 of the present invention, and FIG. FIG. 6, FIG. 6 is a sectional side view of the partition section in Example 3 of the present invention, FIG. 7 is a diagram showing the cutting timing of the extension nozzle, and FIG. It is a figure.

In the examples of the present invention, the underwater curable adhesive composition is not limited as long as it is cured in water and does not contradict the purpose of the present invention. However, considering that it is used in, for example, the fuel storage tank described above, the underwater curable adhesive composition is prepared by adding a radiation-resistant additive to the underwater curable adhesive main agent or the underwater curable adhesive main agent. It is preferable to become.
As the radiation-resistant additive, an aromatic amine-based additive for improving radiation durability is blended, and from the group consisting of modified aromatic polyamines such as diethyltoluenediamine, metaxylenediamine, mensendiamine and the like It is preferred that it is at least one selected compound. Specific examples include Ecure Z (manufactured by Yuka Shell Epoxy Co., Ltd.), sunmide TX983 or M1800 (manufactured by Sanwa Chemical Co., Ltd.), and the like.
In addition, a boron-based additive for improving the neutron-resistant property is also used. As the boron-based additive, at least one compound selected from the group consisting of boron carbide, boron oxide, boron nitride, boron anhydride, iron borate, orthoboric acid and metaboric acid is suitable.
Furthermore, the present embodiment includes blending both the amine-based additive and the boron-based additive. The radiation-resistant additive is preferably blended in each of the main component and the curing agent of the two-component underwater adhesive composition.

  Examples of the main component of the two-component underwater adhesive composition include bisphenol type epoxy resins such as bisphenol A type epoxy resins, and novolak type epoxy resins. On the other hand, the curing agent is at least selected from the group consisting of amines or polyamines such as polyamide amine, modified polyamide amine, modified polyamide polyamine, modified aliphatic polyamine, modified aromatic polyamine, heterocyclic polyamine, and modified alicyclic polyamine. One curing agent is preferred.

  In other words, an epoxy resin is used as the reaction curable resin, and a resin using the curing agent as described above is suitable. Furthermore, bisphenol A type glycidyl ether (manufactured by Yuka Shell Epoxy Co., Ltd .: Epicoat # 828) is used as the main agent, and a modified polyamine (manufactured by Asahi Denka Kogyo Co., Ltd .: ADEKA HARDNA EH265-4), modified At least one or more of polyamide polyamine (manufactured by Three Bond Co., Ltd .: Three Longi W805), modified aliphatic polyamine (manufactured by Fuji Kasei Kogyo Co., Ltd .: Fuji Cure F5405), modified polyamide polyamine (manufactured by Daito Sangyo Co., Ltd .: Daito Cider HR787) What is used is preferred.

It is also possible to use Daito Cider HR (Daito Sangyo), Three Bond W805 (Three Bond), Permaster WE300 (manufactured by China Paint Co., Ltd.), etc., which are commercially available by combining the main agent and the curing agent in advance. Here, Permaster WE300 was used in the following examples.
Moreover, in the present Example, the stainless steel lining material was used on the concrete basic surface of the fuel storage water tank as the lining material on the inner peripheral side of the water tank, and minute defects of this stainless steel lining material were carried out.

FIG. 8 shows the relationship between the reaction rate (curing speed) at ambient temperature and the viscosity of the underwater curable adhesive composition used in this example.
The underwater curable adhesive composition has a low viscosity at a high temperature but a high curing rate. Therefore, the filling speed is increased. On the other hand, at low temperatures, the viscosity is high but the curing rate is slow. Therefore, the filling speed is reduced.
Therefore, it is necessary to select the optimal filling condition by adjusting the liquid feeding speed of the adhesive composition and the output of the motor of the micro defect repairing device according to the environmental temperature. In this example, the preferred environmental temperature was 10 to 45 ° C. This environmental temperature is a temperature determined in consideration of the components of the adhesive composition not denatured and the motor load.

First, with reference to FIGS. 1 and 2, Example 1 in the case where the minute defect is on the side surface of the water tank liner will be described. FIG. 1A is a schematic view of a filling nozzle, and FIG. 1B is a schematic view of a partition section formed on the side surface of the lining material.
As shown in FIG. 1, the filling nozzle 5 is provided with a main agent cartridge 16 for filling the main agent 10 of the underwater curable adhesive composition and a hardener cartridge 17 for filling the hardener 11. In the main agent cartridge 16, the main agent hose 12 is connected to a pipe joint 30 a connected thereto, and the other end side of the main agent hose 12 is connected to one inlet side of the bifurcated pipe joint 30.
Similarly, the hardener cartridge 17 has a hardener hose 13 connected to a pipe joint 30b connected thereto, and the other end of the hardener hose 13 is connected to the other inlet side of the bifurcated pipe joint 30. is doing. This bifurcated pipe joint 30 joins flow paths in two directions in one direction.

The main agent 10 and the hardener 11 filled in the main agent cartridge 16 and the hardener cartridge 17 are pumped by the motor 15 and mixed by the mixing nozzle 14 connected to the bifurcated pipe joint 30 to be an underwater curable adhesive. It becomes a composition. Here, the ratio of the main agent 10 and the curing agent 11 was 1: 1.
The filling nozzle 5 is inserted into a metal partitioning partition 3 formed so as to surround the minute defect 1 of the lining material 2 lined on the inner peripheral side of the water tank. Then, the underwater curable adhesive composition 6 is fed into the partition 3 through the extension nozzle 4 connected to the tip of the filling nozzle 5 and is filled and cured to repair the minute defect 1.

  Although not shown, in the above-described minute defect repairing apparatus, the partition section 3 is formed using a robot arm while being monitored by a CCD camera. Further, while the filling nozzle 5 is monitored by a CCD camera, the filling nozzle 5 may be moved in the X-axis, Y-axis, and Z-axis directions to be appropriately positioned with respect to the minute defect 1 to monitor the filling state.

Here, the tip positions of the partition section 3 and the extension nozzle 4 in the first embodiment will be described with reference to FIG. The partition section 3 needs to be formed with a distance corresponding to the “adhesion length from the minute defect” necessary for repairing the minute defect 1 with the underwater curable adhesive composition. This “adhesion length from minute defects” is defined as D. In this embodiment, the adhesion length D from a minute defect is approximately 4 cm when the environmental temperature is 10 to 45 ° C.
As shown in FIG. 2 (a), compartments body 3 are opposed surface opposite to the surface of the open surface in contact with the side surface facing via the repair surface and the space around small defects, of the facing surfaces A belt-like side wall is disposed around the side of the lining material in contact with the periphery, and the upper side is formed to be an opening into which the filling nozzle 5 can be inserted.

Further, as shown in FIG. 2 (b), the tip of the extension nozzle 4 is inserted into the recessed space of the partition partition body 3, and the “adhesion length” is divided into the underwater curable adhesive composition 6. Adhering from the microdefects having a length that can be sent into the compartment 3 and the composition 6 is filled and cured on the microdefects 1 to easily repair the microdefects in the water tank liner underwater. The length D ′ is secured and extends from the lower region to an arbitrary position between the bottoms of the partitioning partitions 3. When the distal end portion of the extension nozzle 4 is provided apart from the bottom portion of the partition section 3, D> D ′. Further, the tip portion of the extension nozzle 4 may be provided in contact with the bottom portion of the partition section 3. At this time, D = D ′.
Although not shown, the position of the filling nozzle 5 is preferably the same as the position of the extension nozzle 4.

Next, with reference to FIG. 3 and FIG. 4, Example 2 in the case where the minute defect is on the bottom surface of the water tank liner will be described. FIG. 3 is a schematic view of the micro defect repairing apparatus when the micro defect is on the bottom surface.
The filling nozzle 5 is provided separately with a main agent cartridge 16 for filling the main agent 10 of the underwater curable adhesive composition and a hardener cartridge 17 for filling the hardener 11. A CCD camera 18 connected to the CCD camera cable 20 is also fixed to the filling nozzle 5 by a fixing support 19. In the main agent cartridge 16, the main agent hose 12 is connected to a pipe joint 30 a connected thereto, and the other end side of the main agent hose 12 is connected to one inlet side of the bifurcated pipe joint 30.
Similarly, the hardener cartridge 17 has a hardener hose 13 connected to a pipe joint 30b connected thereto, and the other end of the hardener hose 13 is connected to the other inlet side of the bifurcated pipe joint 30. is doing. This bifurcated pipe joint 30 joins flow paths in two directions in one direction.

The main agent 10 and the hardener 11 filled in the main agent cartridge 16 and the hardener cartridge 17 are pumped by the motor 15 and mixed by the mixing nozzle 14 connected to the bifurcated pipe joint 30 to be an underwater curable adhesive. It becomes a composition. Here, the ratio of the main agent 10 and the curing agent 11 was 1: 1.
The filling nozzle 5 is inserted into a metal partitioning partition 3 formed so as to surround the minute defect 1 of the lining material 2 lined on the inner peripheral side of the water tank. At this time, while being monitored by the CCD camera 18, the filling nozzle is moved in the X-axis, Y-axis, and Z-axis directions and is appropriately positioned with respect to the minute defect 1. Thereafter, the underwater curable adhesive composition 6 is fed into the partition wall 3 formed on the bottom surface through the extension nozzle 4 connected to the tip of the filling nozzle 5, filled and cured, and the micro defect 1 is formed. Repair.
Although not shown, as in the first embodiment, the partition section 3 is formed using a robot arm while monitoring with a CCD camera.

  Here, the tip positions of the partition section 3 and the extension nozzle 4 in the second embodiment will be described with reference to FIG. When the minute defect is on the bottom surface of the lining material 2, the partitioning partition 3 surrounds the periphery of the wide enclosed space having a length obtained by extending the adhesion length D from the minute defect located on the bottom surface. A band-shaped side wall is formed so as to surround the bottom surface of the material 2, and an opening or an open space into which the filling nozzle 5 can be inserted is formed in the space above the bottom surface.

  When the minute defect 1 of the lining material 2 is on the bottom surface of the water tank lining material, the tip of the filling nozzle 5 or the extension nozzle 4 is provided in contact with the minute defect 1. By bringing the tip of the filling nozzle 5 or the extension nozzle 4 into contact with the bottom surface, entrainment of water bubbles can be prevented.

The means for providing the tip of the extension nozzle 4 in contact with the bottom of the partitioning partition 3 as described above is to prevent entrainment of water bubbles when the underwater curable adhesive composition is filled in the partitioning partition 3. Is a useful tool.
However, since the outlet port for the underwater curable adhesive composition is actually provided at the end face of the tip, it must be filled several centimeters away from the bottom surface, which may cause water bubbles to be involved. Also, the filling time becomes longer.

Therefore, when the tip of the extension nozzle 4 is provided in contact with the bottom of the partition 3, an outlet opening for the underwater curable adhesive composition is formed on the side of the tip of the extension nozzle 4 as shown in FIG. did. The lead-out opening shown in FIG. 5 can be freely formed without departing from the spirit of the present invention.
As shown in FIG. 5, the extension nozzle 4 can be inserted up to the bottom of the partition section 3 by providing a lead-out opening on the side surface of the tip. Moreover, entrainment of water bubbles can be prevented, and the filling time can be shortened.

Next, Example 3 in the case where the minute defect is in the overhang portion of the water lining material will be described with reference to FIG. FIG. 6 shows an example of a side cross-sectional view of the partition section in the overhang portion on the side surface of the water lining material. FIG. 6A shows the partitioning partition 3 when the overhanging portion has the microdefect 1, and FIG. 6B shows the partitioning partitioning body when the microdefect 1 is under the thickness portion of the overhanging portion. 3 is shown.
As shown in FIG. 6A, when the minute defect 1 is in the overhang portion of the lining material 2, the height B of the partition section 3 must exceed the valley portion A of the overhang portion. That is, the partition body 3 needs to have a height that satisfies B> A.
Further, as shown in FIG. 6B, when the minute defect 1 is below the thickness portion of the overhang portion of the lining material 2, the portion including the minute defect 1 is included and the valley portion of the overhang portion is exceeded. The partition section 3 must have a height that satisfies B> C.
Although not shown in the drawings, as described in any of the examples, the partition member 3 must be formed with a space for securing the adhesion length D from the minute defect in all directions. Moreover, the tip part of the filling nozzle 5 or the extension nozzle 4 at this time secures the adhesion length D from the minute defect as in the first and second embodiments, and the bottom of the partitioning partition 3 from the lower area. They may be provided apart from each other, or may be provided in contact with the bottom of the partition section 3.

Finally, the pulling means for the filling nozzle 5 will be described with reference to FIG. The micro defect repairing apparatus in the present invention feeds the underwater curable adhesive composition for a while with back pressure even after the motor is stopped after filling the underwater curable adhesive composition 6. If the filling nozzle 5 is pulled up at this stage, the uncured adhesive composition will be scattered in the water. In order to prevent this, the cutting of the extension nozzle 4 as shown in FIG. 7 was devised.
After the underwater curable adhesive composition 6 is filled into the partition 3, the adhesive composition is left until the adhesive composition is cured (FIG. 7A). After the underwater curable adhesive composition 6 is cured, the extension nozzle 4 connected to the filling nozzle 5 is cut by a robot (FIG. 7B). After cutting off the extension nozzle 4, the filling nozzle 5 is pulled up from the partition section 3 (FIG. 7 (c)).

In this way, by leaving the extension nozzle 4 in the filled solidified body in which the partition section 3 is filled and solidified with the underwater curable adhesive composition 6, the uncured underwater curable adhesive composition 6 is submerged in the water. The filling nozzle 5 can be pulled up without being sprayed.
Although not shown in the drawings, in the case where the scattering of the underwater curable adhesive composition 6 is allowed to some extent in the partition 3, before the underwater curable adhesive composition 6 is cured after filling the partition 3 with resin. The underwater curable adhesive composition 6 corresponding to the extension volume of the extension nozzle 4 is filled without any defects by pulling out the filling nozzle 5 while feeding the extension nozzle 4 while feeding the underwater curable adhesive composition 6 to the surface. The nozzle 5 may be pulled up.

  By the above-mentioned means, it is possible to prevent the underwater curable adhesive composition 6 from being scattered in the water tank. Further, in the present invention, a flexible polymer material is applied to the portion of the partition member 3 that contacts the lining material 2 to prevent leakage of the adhesive composition from the gap between the partition member 3 and the lining material 2. May be.

  By using the micro defect repairing apparatus in the present embodiment, it is possible to easily repair micro defects in the lining material lined on the inner peripheral side of the water tank underwater using an underwater curable adhesive composition. Become. Moreover, since the partition division body in a present Example can be installed according to the shape of a defective part vicinity also in the water tank which has the three-dimensional structure in the tank, the lining welding part SCC ( (Stress corrosion cracks) It can also be suitably used for emergency repair in water when microleakage associated with damage is observed.

It is the schematic of the micro defect repair apparatus in Example 1. FIG. It is a figure explaining the partition division body and extension nozzle of Example 1. FIG. It is the schematic of the micro defect repair apparatus in Example 2. FIG. It is a perspective view which shows the partition division body of Example 2, and an extension nozzle. It is a sectional side view of the partition division body in Example 3. It is a figure which shows the derivation | leading-out opening of the underwater hardening type adhesive composition provided in the extended nozzle front end side surface. It is a figure which shows the cutting timing of an extension nozzle. It is the figure which showed the relationship between the reaction rate in the ambient temperature (curing speed) and viscosity of an underwater hardening type adhesive composition.

DESCRIPTION OF SYMBOLS 1 Minute defect 2 Lining material 3 Partition division body 4 Extension nozzle 5 Filling nozzle

Claims (10)

In the micro defect repair device that repairs micro defects of the lining material lined on the inner peripheral side of the water tank underwater using an underwater curing type adhesive,
A filling nozzle for feeding an underwater curable adhesive composition;
An extension nozzle connected to the nozzle tip;
In a state where the open surface is in contact with the wall surface of the lining material, a partition body in which a recessed space surrounding the repair surface around the minute defect of the lining material is formed,
An opening for inserting an extension nozzle to which the filling nozzle is attached on the upper surface in the gravitational direction of the partition;
An underwater curable adhesive composition, wherein an extension nozzle connected to the filling nozzle is inserted into the recessed space in the compartment from the opening, and is fed into the recessed space in the compartment through the extended nozzle; With
The filling nozzle in which the adhesive plastic material and the extension nozzle are connected to each other is filled with the adhesive plastic material in the recessed space, and then left until the adhesive composition is cured, and the left adhesive composition After the object is cured, the extension nozzle is cut, and the extension nozzle is left in the solidified body of the adhesive composition . In the micro defect repair device that repairs micro defects of the lining material lined on the inner peripheral side of the water tank underwater using an underwater curing type adhesive,
A filling nozzle for feeding an underwater curable adhesive composition;
An extension nozzle connected to the nozzle tip;
In a state where the open surface is in contact with the wall surface of the lining material, a partition body in which a recessed space surrounding the repair surface around the minute defect of the lining material is formed,
An opening for inserting an extension nozzle to which the filling nozzle is attached on the upper surface in the gravitational direction of the partition;
An extension nozzle connected to the filling nozzle is inserted into the recessed space in the compartment from the opening, and the tip of the extended nozzle is provided in contact with the bottom of the recessed space, and through the extended nozzle. An underwater curable adhesive composition that is fed into a recessed space in the compartment,
The filling device in which the adhesive plastic material and the extension nozzle are connected to each other, wherein the filling nozzle is pulled out while the extension nozzle is connected before the underwater curable adhesive composition is cured . In the micro defect repairing device for repairing micro defects on the side surface of the water tank lining material under water using a submerged curing adhesive ,
The partition body is a facing surface in which the surface opposite to the open surface that contacts the side surface faces the repair surface around the minute defect through the space, and a portion that contacts the side surface of the lining material around the facing surface 3. A minute defect repairing apparatus according to claim 1 or 2 , wherein a partition body partitioned by a belt-shaped side wall is disposed, and an upper surface of the partition body serves as an opening into which a filling nozzle can be inserted . In the micro defect repairing device for repairing micro defects on the bottom surface of the water tank lining material under water using an underwater curing type adhesive ,
The partition body is a partition body in which a recessed space is formed surrounding a repair surface around a minute defect located on the bottom surface of the water tank liner , and the partition body has a belt-shaped side wall at a portion in contact with the bottom surface of the liner material. is formed by surrounding the repair surface, a bottom surface above the open space of the water tank lining material is, according to claim 1 or 2, wherein the filling nozzle through the extension nozzle is an opening that is inserted Small defect repair device. The microdefect according to claim 1 or 2 , wherein a tip of the extension nozzle and a bottom of the recess space are provided in contact with each other, and an adhesive composition outlet opening is formed on a side surface of the tip of the extension nozzle. Repair device. The water tank is a fuel storage tank in a nuclear power plant, and the underwater curable adhesive composition is a two-component underwater curable adhesive or a radiation-resistant addition to the underwater curable adhesive. It claims 1 to 5 or 1 minute defect repairing apparatus according to, characterized in that by blending things. In the micro defect repair method of repairing underwater using a submersible adhesive, the microdefect of the lining material lined on the inner peripheral side of the open container that functions as a water tank,
An extension nozzle is connected to the tip of the filling nozzle for feeding the underwater curable adhesive composition,
On the other hand, in a state where the open surface is in contact with the wall surface of the lining material, prepare a partition body in which a recessed space surrounding the repair surface around the minute defect of the lining material is formed ,
An opening into which a filling nozzle for feeding an underwater curable adhesive composition can be inserted is provided at an upper position in the gravitational direction of the partition, and the tip of the extended nozzle and the bottom of the recessed space are brought into contact with each other through the opening. In the state where the underwater curable adhesive composition is fed through the extension nozzle ,
After the adhesive plastic material is filled into the recess space, the adhesive composition is left to be cured, and after the left adhesive composition is cured, the extension nozzle is cut to cut the adhesive. A method for repairing a micro defect, wherein an extension nozzle is left in the solidified body of the composition . In the micro defect repair method of repairing underwater using a submersible adhesive, the microdefect of the lining material lined on the inner peripheral side of the open container that functions as a water tank,
An extension nozzle is connected to the tip of the filling nozzle for feeding the underwater curable adhesive composition,
On the other hand, in a state where the open surface is in contact with the wall surface of the lining material, prepare a partition body in which a recessed space surrounding the repair surface around the minute defect of the lining material is formed ,
Provided at the upper position in the gravity direction of the compartment is an opening into which a filling nozzle for feeding the underwater curable adhesive composition can be inserted, and an extended nozzle is provided in contact with the bottom of the compartment from the opening. , Feeding the underwater curable adhesive composition through the extension nozzle ,
The method for repairing micro defects, wherein the adhesive plastic material and the filling nozzle are pulled out with the extension nozzle connected before the underwater curable adhesive composition is cured . When the tip of the filling nozzle or the extension nozzle has an opening, the tip of the filling nozzle is provided apart from the bottom of the concave space, and the adhesive composition derived from the nozzle tip opening is free of the micro defect. minute defects repair method according to claim 7 or 8, wherein the filling the concave space while being stacked towards than the adhesion length below to above. The tip of the extension nozzle is in contact with the bottom of the recess space, and a side outlet opening for the adhesive composition is formed on the side of the tip of the extension nozzle. From the side lead-out opening toward the minute defect side from the bottom of the recess space minute defects repair method according to claim 7 or 8, wherein the filling the concave space while being stacked Te.

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