JP2020183890A - Method for forming water cut-off wall within pressure suppression chamber, and structure of water cut-off wall - Google Patents

Abstract

To provide a method for forming a water cut-off wall within a pressure suppression chamber and structure of a water cut-off wall capable of not only forming a water cut-off wall for stopping or shielding water in a pool efficiently and quickly in a pressure suppression chamber within a nuclear reactor building, but also stopping and shielding water reliably.SOLUTION: A method includes a process for partitioning the inside of a pressure suppression chamber 8 into at least two chambers by providing a water cut-off wall 14 in at least two places within the pressure suppression chamber, at least one side of the water cut-off wall 14 is supported by a support material 15 within the pressure suppression chamber, and a part for stopping or shielding water along the outer circumferential direction of a section in the inside of the pressure suppression chamber 8 is formed by a method for performing pressure welding by bringing an elastic member 17 in a shape along the outer circumference of a section in the inside of the pressure suppression chamber 8 into contact with a desired position of a part of a metal wall for composing the outer circumference of a section in the inside of the pressure suppression chamber along with one portion of the water cut-off wall 14, or a projecting part of the metal wall while being supported directly or indirectly by the support material 15.SELECTED DRAWING: Figure 3

Description

INDUSTRIAL APPLICABILITY According to the present invention, a water blocking wall can be efficiently formed in a short time and efficiently inside a pressure suppression chamber installed in a nuclear reactor building of a nuclear power plant, and water can be reliably stopped and blocked. The present invention relates to a method for forming a water blocking wall in a suppression chamber and a structure of the water blocking wall.

Inside the reactor building of a nuclear power plant, a pressure suppression chamber, which is responsible for the pressure control mechanism inside the reactor containment vessel, is installed, and pool water for cooling is stored inside the pressure suppression chamber. In order to prevent accidents, this pool water is sprayed from the strainer at the bottom of the pressure suppression chamber to the reactor and the reactor containment vessel through the submersion valve due to steam condensation when the coolant is lost. ..

During the operation of the nuclear reactor, maintenance for inspection and maintenance will be performed on the pressure suppression chamber, including other equipment and devices, from the viewpoint of preventing accidents and improving safety. In the maintenance of the pressure suppression chamber, repair and repainting are performed at the same time as necessary. Regarding the inspection and maintenance of the pressure suppression chamber, for example, an underwater welding processing method in which welding is performed by underwater work while maintaining the water level of the pool water in the pressure suppression chamber has been proposed (see Patent Document 1).

In addition, in the inspection and maintenance of the pressure suppression chamber, in order to shorten the transfer time of water in the pressure suppression chamber and eliminate the need to install a large tank dedicated to water storage, a partition plate is provided between the pressure suppression chambers to provide a pressure suppression chamber. It has been proposed to partition into a plurality of water chambers and install a water storage ring header capable of storing water in the partitioned water chambers in the vicinity of the pressure suppression chamber (see, for example, Patent Document 2). The method disclosed in Patent Document 2 is to install a pressure suppression chamber having a partition plate provided in advance for partitioning the pressure suppression chamber into a plurality of water chambers.

On the other hand, in Patent Document 3, a method of partially forming a water treatment tank by partitioning the pressure suppression chamber in an existing pressure control chamber has been proposed, and an impermeable wall for partitioning the pressure suppression chamber is provided. , Underwater welding or methods of construction by impermeable sheets are disclosed. Further, Patent Document 4 also proposes a method of separating and closing the strainer in the pressure suppression chamber (pool) by covering the circumference of the strainer with an isolation sheet to isolate the strainer from the cooling water in the pressure suppression pool. ..

Japanese Unexamined Patent Publication No. 2001-51091 JP-A-59-154389 Japanese Unexamined Patent Publication No. 2014-52251 Japanese Unexamined Patent Publication No. 2004-212123

As described above, various methods have been proposed for maintenance for inspection and maintenance of the pressure suppression chamber, but when performing maintenance work in an existing pressure suppression chamber containing pool water, conventional methods have been proposed. There are various technical issues.

As the first technical issue, the cooling water (pool water) in the pressure suppression chamber can be relocated to another location, but from the viewpoint of safety and securing the relocation location, all the pool water in the pressure suppression chamber should be relocated. It cannot be transferred, and it is necessary to store pool water around the work place in the pressure suppression room even during maintenance work. Secondly, various operations such as inspection / maintenance or repair for maintenance need to be performed quickly and easily. Therefore, it is strongly desired to provide an air chamber that does not contain pool water as much as possible at an arbitrary place in the pressure control chamber instead of working in pool water. Thirdly, from the viewpoint of safety, it is necessary to provide the aerial chamber with the pool water in the adjacent chamber, so a waterproof wall that can reliably stop and block water at any place in the water is provided. , It is required to form efficiently in a short period of time. Further, it is desirable that the water blocking wall can be easily removed after the maintenance work.

However, the underwater processing method described in Patent Document 1 is not a technique for providing an air chamber containing as little pool water as possible at an arbitrary place in the pressure control chamber, but is for solving the above technical problem. Difficult to apply.

The invention described in Patent Document 2 is a technique that can be applied when a pressure suppression chamber is newly constructed in the vicinity of the pressure suppression chamber in the reactor building, and is applicable to maintenance work or the like performed in the existing pressure suppression chamber. Can not do it.

The invention described in Patent Document 3 is a water treatment method applied to treat a rust preventive material contained in pool water in the decommissioning of nuclear reactor equipment, and requires maintenance of an existing pressure suppression chamber. Not applicable to do. Further, when the impermeable wall is formed by underwater welding, it is difficult to form the impermeable wall efficiently in a short period of time because the forming of the impermeable wall is complicated and requires advanced welding technology. Similarly, removal after maintenance work requires time and skill. Further, since the underwater welding is performed on the reinforcing ring provided along the inner circumference of the tube of the pressure suppression chamber, the installation location is also limited. On the other hand, when the impermeable wall is formed of an impermeable sheet, it is considered that the robustness of the impermeable wall is not sufficient as described that it cannot be used when there is a difference in head pressure with other portions. In addition, Patent Document 3 specifically describes a structure capable of reliably stopping and blocking water in a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber. It is neither described nor illustrated, and it is unclear whether it can be applied to solve the above technical problems.

Further, although Patent Document 4 describes a method of covering the periphery of the strainer with the isolation sheet, only a structure in which a slight gap is provided in the lower portion of the isolation sheet is disclosed, and the inside of the pressure suppression chamber. No description or suggestion has been made regarding the structure of the portion for stopping or blocking water along the outer peripheral direction of the cross section. Therefore, the technique described in Patent Document 4 cannot be applied as it is as a technique for providing an air chamber containing as little pool water as possible at an arbitrary place in the pressure suppression chamber.

The present invention has been made in view of the conventional technical problems that could not be solved by the above-mentioned known examples, and the above-mentioned pressure suppression is performed in advance for maintenance for inspection and maintenance of the pressure suppression chamber in the reactor building. When the room is divided into two or more rooms and a room in the air is provided, not only can a water blocking wall for stopping or blocking the pool water be efficiently formed in the pool water in a short period of time, but also the pool. It is an object of the present invention to provide a method for forming a water blocking wall and a structure of the water blocking wall in a pressure suppression chamber capable of reliably stopping and blocking water.

INDUSTRIAL APPLICABILITY The present invention can efficiently form a water blocking wall at an arbitrary location in a pressure suppression chamber in a short period of time, and not only can it be easily removed after maintenance work, but also to stop and block pool water. In view of the robustness that can be reliably performed, a method of supporting the water blocking wall with a support material is adopted, and further, in order to reliably stop and block the pool water, the pressure suppression chamber is used. An elastic member whose portion in the outer peripheral direction of the cross section is supported by the support material and has a shape along the outer circumference of the cross section of the pressure suppressing chamber is provided with a part of the water blocking wall and the outer periphery of the cross section of the pressure suppressing chamber. The present invention has been made by finding that the above-mentioned problems can be solved by a method and a structure of performing pressure welding by abutting on a desired position of a metal wall portion or a protruding portion of the metal wall constituting the above.

The configuration of the present invention is as follows.
[1] The present invention is a method of forming a water blocking wall for stopping or blocking pool water inside a pressure suppression chamber inside a nuclear reactor building.
It has a step of partitioning the pressure suppressing chamber into two or more chambers by providing the water blocking walls at at least two or more places in the pressure suppressing chamber.
At least one side of the water blocking wall is supported by a support material provided in the pressure suppressing chamber, and a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppressing chamber is the pressure suppressing. The pressure suppression chamber together with a part of the water blocking wall, in a state where an elastic member having a shape along the outer periphery of the cross section of the indoor portion is directly supported by the support material or indirectly via another member. A method for forming a water blocking wall in a pressure suppression chamber, which is formed by a method of performing pressure welding by abutting on a desired position of a portion of a metal wall constituting the outer periphery of an internal cross section or a protruding portion of the metal wall. provide.
[2] The present invention is the recess or the support of a jig in which a recess is formed in at least one of the U-shaped, I-shaped, and H-shaped groups supported by the support material. With the elastic member inserted or press-fitted together with a part of the water blocking wall into the recess formed at the end of the material, the elastic member is inserted in the metal wall portion constituting the outer periphery of the cross section of the pressure suppression chamber. By arranging and supporting the jig or the support material at a position where the contact is to be made and performing pressure welding by contacting the elastic member with the metal wall portion, the pressure suppression chamber is located in the outer peripheral direction of the cross section. The method for forming a water blocking wall in a pressure suppression chamber according to the above [1], wherein a portion for stopping water or blocking water is formed along the same.
[3] The present invention constitutes the outer periphery of the cross section of the pressure suppression chamber inside in a state where the elastic member is inserted or press-fitted together with a part of the water blocking wall into a recess formed in a part of the support material. By arranging and supporting or fixing the support material at a position where the elastic member is to be brought into contact with the protruding portion of the metal wall, the elastic member is brought into contact with the protruding portion of the metal wall to perform pressure welding. The method for forming a water blocking wall in a pressure suppressing chamber according to the above [1], wherein a portion for stopping or blocking water is formed along the outer peripheral direction of the cross section of the pressure suppressing chamber. ..
[4] In the present invention, the water blocking wall, in a state where a part of the water blocking wall is in contact with the protruding portion of the metal wall constituting the outer periphery of the cross section of the pressure suppression chamber via the elastic member. By fixing the elastic member and the protruding portion of the metal wall with a fixing jig and pressing the elastic member against the protruding portion of the metal wall, water is stopped or shielded along the outer peripheral direction of the cross section of the pressure suppression chamber. The method for forming a water blocking wall in a pressure suppression chamber according to the above [1], wherein a portion for water is formed is provided.
[5] In the present invention, the elastic member is a hollow elastic tube.
By injecting at least one of the group consisting of air, gas, and liquid into the inside of the elastic tube, and pressing the portion of the metal wall constituting the outer periphery of the cross section of the inside of the pressure suppression chamber, the inside of the pressure suppression chamber is pressed. The method for forming a water blocking wall in a pressure control chamber according to any one of the above [1] to [4], wherein a portion for stopping or blocking water is formed along the outer peripheral direction of the cross section. I will provide a.
[6] In the present invention, using the pool water pooled in the pressure suppression chamber, the portion of the metal wall constituting the outer periphery of the cross section of the pressure suppression chamber while injecting the pool water into the inside of the elastic tube. The water stoppage in the pressure suppression chamber according to the above [5], wherein a portion for stopping or blocking water is formed along the outer peripheral direction of the cross section of the inside of the pressure suppression chamber by pressure contacting. A wall forming method is provided.
[7] The present invention has a structure in which the elastic member arranged in a portion for water blocking or water blocking along the outer peripheral direction of the cross section of the pressure suppression chamber is integrated with the water blocking wall. The method for forming a water blocking wall in a pressure suppression chamber according to any one of the above [1] to [6] is provided.
[8] The present invention comprises a step of providing a water blocking wall for stopping or blocking the pool water at at least two or more places in the pressure suppressing chamber in the pool water included in the pressure suppressing chamber.
It has a transfer step of transferring all or a part of water contained in a room surrounded by two adjacent places of the water blocking wall to the outside of the room surrounded by two adjacent places of the water blocking wall.
The item according to any one of the above [1] to [7], wherein a chamber having a small amount of pool water or a chamber containing no pool water is formed at least one place in the pressure suppression chamber by the transfer step. A method for forming a water blocking wall in a pressure suppression chamber according to the description is provided.
[9] In the present invention, the elastic member exceeds a position where the water surface of the pool water contained in the pressure suppression chamber formed after the transfer step becomes the highest along the outer peripheral direction of the cross section of the pressure suppression chamber. The method for forming a water blocking wall in a pressure control chamber according to the above [8], which is characterized in that it is arranged at a height.
[10] In the present invention, the water blocking wall has a structure composed of two or more walls.
The portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppressing chamber is stopped by the method for forming a water blocking wall according to at least any one of [1] to [9]. Provided is a method for forming a water blocking wall in a pressure suppression chamber, which is provided in parallel at least one portion on one side of a region surrounded by two adjacent portions of a water wall.
[11] The present invention has a structure of a water blocking wall provided inside the pressure suppression chamber in order to partition the pressure suppression chamber inside the reactor building.
With the waterproof wall
A support material that supports at least one side of the waterproof wall, and
As a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber, an elastic member having a shape along the outer periphery of the cross section of the pressure suppression chamber is directly or by the support material. A desired portion of the metal wall, or a protruding portion of the metal wall, which, together with a part of the water blocking wall, constitutes the outer periphery of the cross section of the pressure suppression chamber, while being indirectly supported via another member. Provided is a structure of a water blocking wall in a pressure suppression chamber, which comprises a portion formed by abutting a position and performing pressure welding.
[12] In the present invention, the portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber is provided.
A recess was formed in at least one of a group consisting of a U-shape, an I-shape, and an H-shape, which was supported by abutting against a metal wall portion constituting the outer periphery of the cross section of the pressure suppression chamber. An elastic member that is inserted or press-fitted together with a part of the water blocking wall into the recess of the jig or the recess formed at the end of the support material.
The jig or the support material supported by arranging the elastic member at a position where the elastic member is to be brought into contact with the metal wall portion constituting the outer periphery of the cross section of the pressure suppression chamber.
The structure of the water blocking wall in the pressure suppression chamber according to the above [11], wherein the elastic body has a portion that abuts and is pressed against the portion of the metal wall along the outer peripheral direction of the cross section of the pressure suppression chamber. provide.
[13] In the present invention, the portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber is provided.
The elastic member inserted or press-fitted together with a part of the water blocking wall into a recess formed in a part of the support material.
The support material, which is arranged and supported or fixed at a position where the elastic member is to be brought into contact with the protruding portion of the metal wall constituting the outer periphery of the cross section of the pressure suppression chamber,
The structure of the water blocking wall in the pressure suppression chamber according to the above [11], wherein the elastic member has a portion that is in contact with a protruding portion of the metal wall and is pressure-contacted along the outer peripheral direction of the cross section of the pressure suppression chamber. I will provide a.
[14] In the present invention, the portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber is provided.
The water blocking material, the elastic member, and the metal wall in a state where a part of the water blocking wall is in contact with the protruding portion of the metal wall constituting the outer periphery of the cross section of the pressure suppression chamber through the elastic member. The water blocking wall in the pressure suppression chamber according to the above [11], wherein the elastic member has a structure of being pressed against the protruding portion of the metal wall by fixing the protruding portion of the metal wall with a fixing jig. Provide the structure.
[15] The present invention is characterized in that the elastic member is an elastic tube in which at least one of a group consisting of air, gas and liquid is injected into a hollow portion. The structure of the water blocking wall in the pressure suppression chamber according to any one of the above is provided.
[16] The pressure suppression chamber according to the above [15], wherein the elastic member is an elastic tube in which water pooled in the pressure suppression chamber is injected into the hollow portion. Provides the structure of the waterproof wall.
[17] The present invention has a structure in which the elastic member arranged as a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppressing chamber is integrated with the water blocking wall. The structure of the water blocking wall in the pressure suppression chamber according to any one of the above [11] to [16] is provided.
[18] The present invention is characterized in that the elastic member has a structure in which the elastic member is arranged at a height of 1/2 or more of the cross-sectional diameter of the pressure suppression chamber along the outer peripheral direction of the cross section of the pressure suppression chamber. The structure of the water blocking wall in the pressure control chamber according to any one of the above [11] to [17] is provided.
[19] In the present invention, at least any of the above [11] to [18], the portion of the water blocking wall for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber is According to the structure of the water blocking wall described in the above, the pressure is characterized by having a structure in which two or more are provided in parallel with at least one place on at least one side in a region surrounded by two adjacent places of the water stopping wall. Provide a structure of a water blocking wall in a restraint chamber.

The method for forming a water blocking wall and the structure of the water blocking wall according to the present invention are such that maintenance work for inspection and maintenance of the pressure suppressing chamber in the reactor building is performed in advance in two or more chambers in the pressure suppressing chamber. When a room in the air is provided by partitioning into, not only can a water blocking wall for water blocking or water blocking be efficiently formed in the pool water in a short period of time, but also the pool water is stopped in the pressure suppression chamber. It is possible to provide a water blocking wall forming method and a water blocking wall structure capable of reliably performing water and water blocking. In particular, a great effect can be obtained on the water blocking or water blocking of the portion of the pressure suppression chamber in the outer peripheral direction of the cross section, which is a big technical problem when constructing the water blocking wall. Further, even if the aerial chamber provided by transferring the pool water to another place in the pressure suppression chamber after the formation of the water blocking wall causes a large head pressure difference with other parts. It has excellent robustness and can exhibit high water stopping property or water shielding property.

Further, the method for forming a water blocking wall and the structure of the water blocking wall in the pressure suppression chamber according to the present invention not only have high robustness against water blocking or water blocking, but also unlike the conventional welding method, after maintenance work. It is easy to remove and remove the water blocking wall.

Although the method for forming a water blocking wall in the pressure suppression chamber and the structure of the water blocking wall according to the present invention can be mainly applied when performing maintenance work involving the transfer of pool water in an existing pressure suppression chamber containing pool water. Since it has the above effects, it can be applied even when all the pool water in the pressure suppression chamber is transferred and then only new water is injected, and it is easy to use, so it can be applied to various applications. be able to.

It is sectional drawing which shows the schematic structure of a part of a nuclear reactor plant. It is a figure which shows the structure of the pressure suppression chamber which the reactor plant shown in FIG. 1 has. It is the schematic when the example of the water stop wall of the pressure suppression chamber by this invention is seen from the cross section of the pressure suppression chamber. It is the schematic when the deformation example of the water stop wall formed by this invention is seen from the cross section of a pressure suppression chamber. It is the schematic when seen from the cross section of the pressure suppression chamber, another modification of the water stop wall formed by this invention. It is sectional drawing for demonstrating the method of forming a water stop wall in a pressure suppression chamber by 1st Embodiment of this invention. It is sectional drawing which shows the method of forming the water stop wall in the pressure suppression chamber and the structure of the water stop wall by 1st Embodiment of this invention. It is sectional drawing which shows the method of forming the water stop wall in the pressure suppression chamber and the structure of the water stop wall by the 2nd Embodiment of this invention. It is sectional drawing which shows the method of forming the water stop wall in the pressure suppression chamber and the structure of the water stop wall by the 3rd Embodiment of this invention. It is a figure explaining the method of forming a water stop wall in a pressure suppression chamber by 4th Embodiment of this invention.

Hereinafter, a method for forming a water blocking wall and a structure of the water blocking wall in the pressure suppression chamber according to the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing a schematic configuration of a part of a nuclear power plant. Further, FIG. 2 shows the configuration of the pressure suppression chamber of the reactor plant shown in FIG. The nuclear power plant shown in FIGS. 1 and 2 is an example of a nuclear power plant having a boiling water reactor, but the present invention is not limited to the example shown in FIGS. 1 and 2.

As shown in FIG. 1, the nuclear power plant 1 includes a reactor containment vessel 3, a dry well 4, a reactor pressure vessel 5, and the reactor pressure vessel housed in a reactor building 2 formed of reinforced concrete or the like. A reinforced concrete support portion 6 for supporting 5, a torus chamber 7, and a pressure suppression chamber 8 housed in the torus chamber 7 are provided, and a water leakage prevention wall 9 is provided on the lower outer wall of the reactor building 2. There is. The dry well 4 is connected to the pressure suppression chamber 8 by a vent pipe 10. The vent pipe 10 is a steel pipe that guides the steam to the pressure suppression chamber 8 when the steam leaks into the dry well 4, and is provided with eight pipes as shown in FIG.

The pressure suppression chamber 8 is also called a “suppression chamber”, and as shown in FIGS. 1 and 2, the pressure suppression chamber 8 is composed of steel pipes having a spherical cross section and arranged in an annular shape (doughnut shape). As shown in FIG. 2, the pressure suppression chamber 8 is formed by an annular torus chamber 7 formed by dividing it into 16 by a solid line. The pressure suppression chamber 8 is provided with a vent header 11 and a downcomer 12, and further, pool water 13 is stored. Here, as shown in FIG. 1, the water surface of the pool water 13 is usually set so that the water surface is slightly higher than the opening 12a at the lower end of the downcomer 12.

Since the pool water 13 is used as cooling water for cooling the reactor pressure vessel 5, it is required to always store the pool water 13 in the pressure suppression chamber 8 in order to ensure the safety of the nuclear power plant. This is the same even when performing maintenance work for inspection and maintenance of the pressure suppression chamber 8, and there is a strong demand from the viewpoint of safety. Therefore, as shown in Patent Document 1, the maintenance work is generally performed in water. However, since the work underwater uses divers and the like, the number of engineers who can handle it is limited, and not only the time required for inspection and maintenance is long, but also the technical difficulty is extremely high. Therefore, it is desirable that the maintenance work be performed in an air space with as little pool water 13 as possible.

For example, if all of the pool water 13 stored in the pressure suppression chamber 8 is relocated to another place, and then the entire pressure suppression chamber 8 is emptied without water, maintenance work is extremely necessary. However, this method cannot be adopted not only for safety but also for securing a place to transfer a large amount of pool water. Based on such a technical problem, the present invention secures a space in which maintenance work can be performed quickly and easily in a pressure suppression chamber, and pool water is stored in other areas other than the space. By doing so, it is not necessary to provide a transfer place for a large amount of pool water, and the purpose is to ensure sufficient safety of the reactor even during maintenance work.

The method for forming a water blocking wall of the pressure suppressing chamber according to the present invention is a step of partitioning the inside of the pressure suppressing chamber 8 into two or more chambers by providing water blocking walls at at least two or more places of the torus chamber 7 forming the pressure suppressing chamber 8. Has. As a result, maintenance work in water can be avoided, and an aerial space with as little pool water as possible can be provided at a desired location in the pressure suppression chamber 8. Here, the desired place in the pressure suppression chamber 8 is a place having a space having a sufficient area so as not to interfere with the maintenance work, centering on the place where the maintenance work is performed.

The place where the maintenance work is performed is not limited to only one place in the pressure suppression chamber, and several places can be selected. For example, as shown in FIG. 2, one room of the torus chamber 7 is set as the area A as an aerial space in which the pool water 13 is reduced as much as possible, and another room of the torus room 7 is set as a space for storing the pool water 13. When the region is B, a water blocking wall is formed at the boundary between the regions A and B so as to be adjacent to each other inside the torus chamber 7 forming the pressure suppression chamber 8. Then, the area A of the place where the maintenance work is performed with the combination of A and B as one set is provided at one or more places at an arbitrary place of the torus chamber 7. After the water blocking wall is formed in this way, the pool water 13 contained in the area A is transferred to the area B, so that the area A is in a state where the pool water 13 is low or the pool water 13 is absent. It can be an inside space. Here, the regions A and B are not limited to one room of the torus chamber 7, and may be provided across two or more chambers of the torus chamber 7. As a result, maintenance work can be carried out at multiple locations at the same time while ensuring the safety of the reactor, so the time required for inspection and maintenance can be shortened.

As shown in FIG. 2, two or more water blocking walls provided in the pressure suppression chamber 8 are provided at each seam (boundary portion of the solid line C shown in the figure) of the 16 chambers constituting the annular torus chamber 7. It may be provided at an arbitrary place in each room of the torus room 7 located between the seams. Each seam portion of the torus chamber 7 composed of 16 chambers may be provided with a reinforcing ring on a metal wall along the circumference of the internal cross section. This reinforcing ring is provided, for example, as a protrusion of a metal wall in which a steel material having a T-shaped or linear cross section forms a ring shape of the torus chamber 7, and the protrusion portion of the metal wall is used to support the water blocking wall. It can be used as a department. When performing maintenance work inside the pressure suppression chamber 8 provided in the middle between each seam of the torus chamber, the protruding portion of the metal wall may be used as a support portion of the water blocking wall. Further, not only the joints of the respective chambers of the torus chamber 7 but also the protruding portions (ring girders) provided between the joints of the respective chambers of the torus chamber 7 may be used as the support portion of the water blocking wall. .. The present invention is not limited to the protruding portion of the metal wall, and even when the metal wall constituting the torus chamber 7 has no protruding portion, as will be described later, the configuration of the support material for supporting the waterproof wall And by optimizing the structure, a water blocking wall can be constructed at any place of the metal wall inside the torus chamber 7.

The water blocking wall formed by the present invention is further supported on at least one side by a support material provided in the pressure suppressing chamber, and is a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppressing chamber. However, a part of the water blocking wall is supported by the support material directly or indirectly via another member of the elastic member having a shape along the outer periphery of the cross section of the pressure suppression chamber. At the same time, it is formed by a method of performing pressure welding by abutting on a desired position of a metal wall portion forming the outer periphery of the cross section of the pressure suppression chamber or a protruding portion of the metal wall.

FIG. 3 is a schematic view of an example of a water blocking wall in the pressure suppression chamber according to the present invention when viewed from a cross section of the pressure suppression chamber. 3A and 3B are views showing the front side surface and the back side surface of the water blocking wall 14 when viewed from the cross section of the pressure suppression chamber 8.

In the structural example shown in FIG. 3, the water blocking wall 14 is formed of a water blocking sheet 16 supported by a support material 15 assembled in a grid pattern on one side at an angle. The upper part of the water blocking wall 14 is connected to a support material 15a that comes into contact with a metal wall portion constituting the pressure suppression chamber 8, and strong reinforcement is performed. Here, the portion 15a of the support material is arranged at a position higher than the water level of the pool water contained in the pressure suppression chamber in order to reduce the influence of the water pressure of the pool water. Thereby, it can be firmly fixed to the metal wall constituting the inside of the pressure suppression chamber 8.

On the other hand, the support material arranged at a position lower than the water level of the pool water other than the portion 15a is a force pushing out in the direction perpendicular to the outer peripheral direction of the cross section inside the pressure suppression chamber 8 (direction illustrated by → in FIG. 3). It is supported by the metal wall portion constituting the pressure suppression chamber 8 by the force acting on the pressure suppression chamber 8. As a result, the impermeable sheet 16 can be firmly fixed. By supporting the water blocking wall 14 with the support material 15 in this way, the structure is such that the pressure suppression chamber 8 can sufficiently withstand the difference in head pressure generated between the pool water and another chamber to which the pool water is transferred. be able to.

A major technical problem in the water blocking wall 14 shown in FIG. 3 is a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber. In this portion, an elastic member 17 having a shape close to the shape along the outer periphery of the cross section inside the pressure suppression chamber 8 is brought into contact with the metal wall portion constituting the pressure suppression chamber 8 and pressure-contacted to stop and shield water. Performance can be improved. At this time, the elastic member 17 needs to be arranged to a position higher than the water level of the pool water contained in the pressure suppression chamber 8 having a circular cross section. Therefore, as the elastic member 17, a member having a semicircular or longer peripheral length and a nearly circular shape is used. Further, the elastic member 17 is supported directly by one end 15b of the support member 15 or indirectly via another member, and is placed at an arbitrary position on the metal wall constituting the inside of the pressure suppression chamber 8. Be abutted. After that, the elastic member 17 is pressure-welded to improve the adhesion to the metal wall constituting the inside of the pressure suppression chamber 8, so that the water-stopping wall 14 is finally formed in the pool water. All of these tasks are done in pool water. A method of forming the portion for stopping or blocking water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8 by the elastic member 17 will be specifically described in the embodiment described later.

As the impermeable sheet 16 used as the waterproof wall 14 in the present invention, a thin metal or plastic plate, and a waterproof plastic sheet or an umbrella sheet can be used. The plastic sheet or sheet and the rubber sheet may contain an inorganic filler to improve the strength. Since the impermeable wall 14 formed by the present invention has a structure supported by the support material 15, the impermeable wall having sufficient structural strength even if the impermeable sheet 16 made of a thin metal sheet or a plastic sheet is used. Can be formed.

The support material 15 used in the present invention is not limited to the lattice shape assembled at the angle shown in FIG. 3, and may be a flat plate or a box-shaped beam (rectangular pipe) in part or in whole. For example, as shown in FIG. 4, in the support material, the support portion 15c located at the center of the internal cross section of the pressure suppression chamber 8 has a flat plate structure, and only the narrow support portion 15d facing the peripheral direction of the internal cross section of the pressure suppression chamber 8 is formed. Is radial or grid-like. The support portion 15d shown in FIG. 4 is arranged radially from the center of the internal cross section of the pressure suppression chamber 8. The support portion 15d may have a grid pattern that intersects at right angles as shown in FIG. The support portion 15d can be easily brought into contact with the metal wall constituting the inside of the pressure suppression chamber 8 by adding an expansion / contraction function for adjusting the length. Further, by adopting a foldable structure, a splittable structure, or the like for the support portion 15c, the support material 15 can be easily attached to the torus chamber 7.

Examples of the material of the support material 15 include metals and plastics (including plastics containing at least one of inorganic fibers and inorganic particles), but the material is not limited as long as it has strength, and wood. May be good. Further, the other member that is in contact with or connected to one ends 15b and 15d of the support material 15 in order to support the elastic member 17 is also processed into a predetermined shape using the same material as the support material 15. To do. Details of the other member will be described later.

Further, when the water blocking wall 14 is formed at the joint of each of the 16 chambers constituting the annular torus chamber 7, the support material 15a abutting on the metal wall portion constituting the pressure suppressing chamber 8 is used. It may be connected to a metal protrusion existing at a seam of the torus chamber 7 by a usual welding method. The position where the support material 15 is connected by welding is not limited to a position higher than the water level of the pool water contained in the pressure suppression chamber, and even if the support material 15 is connected to an arbitrary place at a position lower than the water level by the underwater welding method. Good. In that case, the number of points to be welded underwater can be minimized, and the work of underwater welding can be reduced by narrowing the width of the support material or reducing the thickness thereof. When there are few places to perform underwater welding, it is possible to omit the removal of the underwater welding part after the maintenance work. Further, when the elastic member 17 forms a portion for stopping or blocking water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8, the portion connected by underwater welding can be used as a starting point, so that it is elastic. It has the advantage that the member 17 can be easily installed and fixed.

As the elastic member 17 used in the present invention, a solid elastic rubber packing and an elastic tube capable of injecting at least one of a group consisting of gas and liquid such as air and nitrogen can be used. In some cases, flexible metal elastic packing may be used.

Since the elastic member 17 used in the present invention is used in a state of being directly supported by one ends 15b and 15d of the support material 15 or indirectly via another member, the elastic member 17 is hit. An elastic tube that makes it easy to adjust the diameter of the elastic member 17 before and after contacting and pressure welding is preferable. Further, the elastic tube is formed of a thickness and a material that can maintain a certain degree of strength and shape when directly or indirectly supported by the one ends 15b and 15d of the support material 15 via another member. It is preferable to do so.

As the substance to be injected into the elastic tube, a liquid is particularly preferable because the pressure contact strength with the metal wall portion constituting the pressure suppression chamber 8 can be increased from the group consisting of air, gas and liquid. .. As the liquid to be injected, water from the outside or the like may be used, but it is more preferable to use water pooled in the pressure suppression chamber 8. As a result, the work of forming a portion for stopping or blocking water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8 can be performed efficiently and in a short time.

Further, it is preferable that the elastic member 17 arranged in the portion for stopping or blocking water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8 has a structure integrated with the water blocking wall 14. As a result, the elastic member 17 and the end portion of the impermeable sheet 16 constituting the water blocking wall 14 can be simultaneously supported by the support material 15, so that the elastic member 17 and the end portion of the impermeable sheet 16 can be combined. Labor can be saved and work efficiency can be improved. Not only that, since it is possible to eliminate the step created by the overlapping of the elastic member 17 and the end portion of the water-impervious sheet 16, it has a great advantage in that the effect of water-stopping or water-shielding can be enhanced.

As the water blocking wall 14 used in the present invention, in addition to the structures shown in FIGS. 3 and 4, the structure shown in FIG. 5 can be adopted. In the water blocking wall 14 shown in FIG. 5, the elastic member 17 has a height of 1 / 2D or more of the cross-sectional diameter (D shown in FIG. 5) in the pressure suppressing chamber 8 along the outer peripheral direction of the cross section inside the pressure suppressing chamber 8. It has a structure that is arranged in a sill. When the elastic member 17 arranged in this way comes into contact with the metal wall portion constituting the pressure suppression chamber 8, the repulsive force that the elastic member 17 tries to spread causes a large pressing force against the metal wall portion. Become. Therefore, it becomes easy to arrange the elastic member 17 along the outer peripheral direction of the cross section of the pressure suppression chamber, and the work when mounting the elastic member 17 while being supported by the support members 15b and 15d is efficient. It can be done in a short time. When the arrangement height of the elastic member 17 is less than 1 / 2D of the cross-sectional diameter (D) in the pressure suppression chamber 8, the installation work of the elastic member 17 becomes complicated. Further, setting the arrangement height of the elastic member 17 to 1 / 2D or more not only makes it possible to raise the position of the pool water that can stop or block water, but also even if the position of the pool water is less than 1 / 2D. The height of the water blocking wall 14 at the time of formation can be freely changed. Therefore, it has the advantage of increasing the degree of freedom in design.

The water blocking wall 14 formed in this way is supported by the support material 15 in which the water blocking sheet 16 is firmly fixed to the metal wall constituting the inside of the pressure suppression chamber 8, and is supported by the support material 15. Since the elastic member 17 forms a portion that stops or blocks water along the outer peripheral direction of the cross section of the pressure suppressing chamber, it has excellent water stopping or water blocking. In particular, a great effect can be obtained on the water blocking or water blocking of the portion of the pressure suppression chamber in the outer peripheral direction of the cross section, which is a big technical problem when constructing the water blocking wall. This effect is when the air chamber provided after transferring the pool water to another place in the pressure suppression chamber 8 causes a large head pressure difference with another part to which the pool water is transferred. However, it can exhibit high water-stopping or water-blocking properties and have excellent robustness against water-stopping and water-blocking.

Further, the impermeable wall 14 can efficiently form a robust impermeable wall 14 in pool water in a short period of time without performing complicated work such as underwater welding. Even if hyperbaric welding is performed, the work can be minimized. Further, the water blocking wall formed by the present invention is advantageous as compared with the conventional method for forming a water blocking wall in that it can be easily removed and removed after the maintenance work.

Next, the method of forming the water blocking wall in the pressure suppression chamber and the structure of the water blocking wall according to the present invention will be described with reference to the following embodiments. In particular, a method of forming a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber and the details of the structure will be described with reference to the drawings, but the scope of the present invention is the following embodiment. It is not limited to.

<First Embodiment>
FIG. 6 is a diagram illustrating a method of forming a water blocking wall in a pressure suppression chamber according to the present invention. In FIG. 6, the water blocking wall 14 is formed as an arbitrary place of the metal wall inside the torus chamber 7 forming the pressure suppression chamber 8 at two places having no protruding portion of the metal wall.

As shown in FIG. 6A, the water blocking walls 14a and 14b are each composed of a plastic water blocking sheet 16 whose one side is supported by a metal support material 15 provided in the pressure suppression chamber 8. There is. After the formation of the water stop wall 14, the pool water 13 contained in the area (I) surrounded by the water stop walls 14a and 14b is transferred to other chambers (areas (II) and / or (III). , As shown in FIG. 6B, the area (I) surrounded by the water blocking walls 14a and 14b is used as a room having an aerial space used when performing maintenance work for inspection and maintenance. The pool water 13 included in the area (I) surrounded by the water blocking walls 14a and 14b does not need to be relocated to another room, and sufficient aerial space is secured for maintenance work. If possible, it may remain slightly on the bottom.

In the present embodiment, as shown in FIG. 6B, the elastic member 17 has a region (II) in the pressure suppression chamber 8 which is a transfer process destination of pool water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8. ) And / or (III), it is preferable that the pool waters 13a and 13b are arranged at a height exceeding the position where the water surface becomes the highest. Thereby, it is possible to prevent the pool water existing in the area (II) and / or (III) from getting over the water blocking wall 14 and entering the area (I) after the transfer.

After that, inside the pressure suppression chamber 8, the metal wall in the pressure suppression chamber 8 belonging to the region (I) is subjected to maintenance work for inspection and maintenance together with cleaning the inside. If minute cracks or paint peeling are found on the metal wall belonging to the region (I), they are repaired and repainted.

After the maintenance work, as shown in FIG. 6 (c), the pool water relocated to the area (II) and / or (III) is transferred to return to the original area (I). After that, by removing the water blocking walls 14a and 14b, the pressure suppression chamber was returned to the initial state (see (d) in FIG. 6), and after confirming the presence or absence of an abnormality in the reactor, there was no abnormality. If operation is resumed.

In FIG. 6, a method of forming a room having a small amount of pool water 13 or a room not containing pool water 13 is shown as the area (I), but the present invention is provided as the area (I). The number of rooms is not limited to one, and there may be two or more in any place.

As described above, in one embodiment of the method for forming a water blocking wall in the pressure suppression chamber 8 according to the present invention, in the pool water 13 included in the pressure suppression chamber 8, the pool water 13 is placed in at least two or more places in the pressure suppression chamber 8. The step of providing a water blocking wall 14 for stopping or blocking water, and the water stopping wall 14 for all or part of the water contained in the room (area) surrounded by the two adjacent places. It has a transfer step of transferring from a room (area) surrounded by two adjacent locations to the outside. By this transfer step of the pool water 13, a room having a small amount of the pool water 13 or a room not containing the pool water 13 can be formed at least one place in the pressure suppression chamber 8.

In the method of forming a water blocking wall in the pressure suppressing chamber according to the present embodiment, the water blocking wall 14 is provided to block the pool water 13 contained in the pressure suppressing chamber 8, but the pressure suppressing without the pool water 13 is provided. Even when water is newly injected into the chamber 8, a reliable water blocking or water blocking effect can be obtained by forming the same water blocking wall 14 as shown in FIG. As described above, since the method for forming the water blocking wall in the pressure suppression chamber according to the present embodiment is excellent in usability, it can be applied to various uses.

FIG. 7 shows an enlarged structural example in which the portion inside the dotted frame shown as the portion for stopping or blocking water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8 in FIG. 6A was extracted. Shown. (A) to (f) of FIG. 7 show six examples of configurations and structures adopted as the impermeable wall 14.

As shown in FIG. 7, a portion surrounded by a dotted frame as a portion for stopping or blocking water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8 is supported by the support material 15. The elastic member 17 is formed in the recess 18 of the jig in which the recess is formed in at least one of the shapes of the group consisting of a shape, an I shape, and an H shape, or the recess 23 formed in the end portion of the support material 15. , 22 is inserted or press-fitted together with a part of the water blocking wall 14, and the jig or the jig is placed at a position where the elastic member 17 is to be brought into contact with the metal wall portion 19 constituting the outer periphery of the cross section inside the pressure suppression chamber 8. The support member 15 is arranged and supported, and the elastic member 17 is brought into contact with the portion 19 of the metal wall to perform pressure welding. Here, the "jig in which the recess is formed in at least one of the U-shaped, I-shaped, and H-shaped groups" is indirectly supported by the support material 15 via another member. Corresponds to "another member" when it is done.

In the structure of the water blocking wall shown in FIG. 7A, an H-shaped jig 20 is used as an “another jig”. The H-shaped jig 20 is handled as a jig in which a recess 18 for inserting or press-fitting the elastic member 17 is formed. As the H-shaped jig 20, for example, a metal processed product can be used, and can be supported or fixed by a known method such as fitting, fastening, bonding, and connecting with a support material 15. As the water-impervious sheet 16, for example, a plastic sheet material is used, and when the elastic member 17 is inserted or press-fitted into the recess 18 of the H-shaped jig 20, as shown in FIG. 7A. Insert, insert or press fit at the same time. After that, the elastic member 17 is pressure-welded by fixing the support material 15 in a state of being pressed against the metal wall portion 19 constituting the outer periphery of the cross section inside the pressure suppression chamber 8.

As the elastic member 17, a solid elastic rubber packing or a metal elastic packing may be used, but it is preferable to use a hollow elastic tube. After the hollow elastic tube used as the elastic member 17 is brought into contact with the metal wall portion 19, liquid is injected from at least one end of both ends of the elastic tube, and the elasticity after contact is applied by the liquid injection pressure. The tube can be inflated and pressure-welded. As the liquid used here, water from the outside or the like may be used, but for the reason described above, it is preferable to use the pool water 13 pooled in the pressure suppression chamber 8. Further, the hollow elastic tube retains its shape and strength as an elastic tube to a certain extent so that the deformation of the shape can be reduced and the work can be easily performed when the hollow elastic tube is inserted or press-fitted into the H-shaped jig 20. It is preferable to use one made of a thickness and material that can be used.

The H-shaped jig 20 shown in FIG. 7A has a tapered shape so that the portion forming the recess 18 is slightly widened toward the opening in order to facilitate insertion or press fitting of the elastic member 17. You may. Further, depending on the shape and diameter of the elastic member 17, an I-shaped jig can be used instead of the H-shaped jig 20. The H-shaped jig 20 or the I-shaped jig does not necessarily have to have a shape line-symmetrical with respect to the center, and only the portion forming the recess 18 is relative to the other portions. May be lengthened.

The structure of the water blocking wall shown in FIG. 7B is a U-shaped jig 21 as an “another jig”. The U-shaped jig 21 is handled as a jig in which a recess 18 for inserting or press-fitting the elastic member 17 is formed. The U-shaped jig 21 is supported by, for example, using a metal processed product and being bonded to the support material 15 with a resin or fixed to the support material 15 in advance by welding, brazing, or the like. As the impermeable sheet 16, the same sheet as in FIG. 7A is used. As shown in FIG. 7B, the elastic member 17 is inserted into the recess 18 of the U-shaped jig 21 together with the impermeable sheet 16 and inserted or press-fitted. After that, the elastic member 17 is pressure-welded by fixing the support material 15 in a state of being pressed against the metal wall portion 19 constituting the outer periphery of the cross section inside the pressure suppression chamber 8.

The structure of the water blocking wall shown in FIG. 7 (c) is the same as that shown in FIG. 7 (a) in that the H-shaped jig 20 is used as the "separate jig". The difference is that instead of the elastic member 17, an elastic member 22 having a structure integrated with the impermeable sheet 16 constituting the water blocking wall 14 is used. As shown in FIG. 7C, since the elastic member 22 has an integral structure with the water-impervious sheet 16 constituting the water blocking wall 14, the elastic member 22 is formed in the recess 18 of the H-shaped jig 20. Can be supported by the support material 15 simply by inserting or press-fitting. Therefore, unlike the formation of the structure of the water blocking wall shown in FIG. 7A, the labor for combining the elastic member 17 and the water blocking sheet 16 can be saved, and the work efficiency can be improved. Further, by using the elastic member 22 having a structure integrated with the water blocking wall 14, it is possible to eliminate the step created by the superposition of the elastic member 17 and the water blocking sheet 16, so that the water blocking or water blocking is possible. Can enhance the effect of.

In the water blocking wall shown in FIG. 7 (d), the elastic member 17 is used together with the end portion of the water blocking sheet 16 which is a part of the water blocking wall 14 as a support material without using the “separate jig”. It has a structure that is directly supported by the support material 15 by being inserted or press-fitted into the recess 23 formed in the recess 23 formed in the end portion 15b of the 15. Since the shape and depth of the recess 23 formed in the portion 15b of the support material can be set by the shape and diameter of the elastic member 17, the cross section has a rectangular shape as shown in FIG. 7D. It is not limited and may have a circular or elliptical shape.

The waterproof wall 14 shown in FIG. 7 (e) has a structure in which two support members 15 and 24 are arranged on both sides of the impermeable sheet 16 unlike the structure shown in FIG. 7 (d). The elastic member 17 is inserted into the recess 23 formed in the end portion 15b of the support material 15 arranged on one surface of the impermeable sheet 16 together with the end portion of the impermeable sheet 16 which is a part of the waterproof wall 14. Or it is press-fitted. This support method is basically the same as that shown in FIG. 7D, except that another support material 24 is arranged on the other side surface of the impermeable sheet 16. As shown in FIG. 7 (e), the water blocking wall formed in the present embodiment may have a structure in which both sides are supported by the support members 15 and 24.

Further, the water blocking wall 14 shown in FIG. 7 (f) is the same as the water blocking wall 14 shown in FIG. 7 (c) in that an elastic member 22 having a structure integrated with the water blocking sheet 16 is used. However, the difference is that the H-shaped jig 20 is fixed to the protruding portion 25 of the metal wall provided between the joints of the respective chambers of the torus chamber 7 or the joints of the respective chambers of the torus chamber 7. .. Fixing the H-shaped jig 20 and the protruding portion 25 of the metal wall is easily performed, for example, by fitting the holding jig 15 provided in connection with the support material 15 to the protruding portion 25 of the metal wall. be able to. Since the water blocking wall 14 shown in FIG. 7 (f) is formed on the metal wall 19 of the portion having no protrusion portion in the vicinity of the place where the protrusion portion 25 of the metal wall is provided, the place where the water stop wall 14 is installed is Although limited, it has the advantage that the H-shaped jig 20 can be attached and fixed more firmly than the structures shown in FIGS. 7A to 7E. As a result, the effect of water blocking and water blocking by the water blocking wall 14 can be enhanced.

<Second embodiment>
FIG. 6 shows an example of deformation of the structure when the inside of the dotted frame shown as a portion for stopping or blocking water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8 in FIG. 6A is extracted and enlarged. 8 is shown in a cross-sectional view. 8 (a), (b) and (c) show the configuration and structure of the water blocking wall 14 formed by utilizing the protruding portion 25 of the metal wall of the torus chamber 7 forming the pressure suppression chamber 8. An example is shown. As described above, when the protruding portion 25 of the metal wall is not only set at the joint of each chamber of the torus chamber 7, but also exists as a metal protrusion (ring girder) between the joints of each chamber of the torus chamber 7. The structure of the water blocking wall 14 shown in FIG. 8 is applied to at least one of them. FIG. 8 shows only a simple linear shape extending in the radial direction of the cross section in the pressure suppression chamber 8 as the protruding portion 25 of the metal wall inside the pressure suppression chamber 8, but the shape is T-shaped or other. Even if it has a shape, the water blocking wall 14 can be formed in the same manner as in the present embodiment only by changing the shape of the support material 15.

As shown in FIG. 8, the elastic member 17 is stopped in the recess 23 formed in a part of the support material 15 at the portion for stopping or blocking water along the outer peripheral direction of the cross section inside the pressure suppression chamber 8. The support material 15 is arranged at a position where the elastic member 17 is to be brought into contact with the protruding portion 25 of the metal wall forming the outer periphery of the cross section inside the pressure suppression chamber 8 while being inserted or press-fitted together with a part of the water wall 14. By supporting or fixing the elastic member 17 in contact with the protruding portion 25 of the metal wall and performing pressure welding, a portion for stopping or blocking water is formed along the outer peripheral direction of the cross section inside the pressure suppression chamber 8. Will be done. Here, the part of the water blocking wall 14 means, for example, an end portion where the water blocking sheet 16 shown in FIG. 8 is close to the protruding portion 25 of the metal wall inside the pressure suppression chamber 8. As the water blocking wall 14, in addition to the water blocking sheet 16, a thin plate or sheet made of any of metal, plastic, and rubber can be used.

In the structure of the waterproof wall shown in FIG. 8 (a), the support material 15 is divided into two, which means that the support material 15 is carried in and the support material 15 is attached to the protruding portion 25 of the metal wall. This is intended to improve workability by making it easier. The two divided support members 15 are connected by a fastening jig (not shown in the drawing) or the like when forming the water blocking wall 14. In the present embodiment, the support material 15 may not be divided according to the size of the work space, or the support material 15 may be divided into three or more as needed.

Further, the support material 15 is formed with a minute protrusion 26 near a place where the elastic member 17 is to be brought into contact with the protrusion 25 of the metal wall. Since the protruding portion 26 has a flat head, the support material 15 is pressed against the metal wall by fastening the protruding portion 25 of the metal wall in the direction of the minute protrusion 26 using a bolt or the like as a fixing jig 27. It can be supported or fixed by abutting on the protruding portion 23 of the. At the same time, since the elastic member 17 is brought into contact with the protruding portion 25 of the metal wall together with the end portion of the impermeable sheet 16, the impermeable sheet 16 is sandwiched between the protruding portion 25 of the metal wall and the elastic member 17. Pressure welding is performed in the form. In the present embodiment, it is not always necessary to provide the minute protrusions 26. For example, as shown in FIG. 8B, the support material has a flat surface in contact with the protrusions 25 of the metal wall. May be used.

In the structure of the water blocking wall shown in FIG. 8B, the surface (the surface on the right side in the drawing) of the portion of the support material 15 that comes into contact with the protrusion 25 of the metal wall has a flat shape, and the flat shape is formed. This is an example in which a recess 23 for inserting or press-fitting two elastic members 17 is provided on the surface. The support member 15 is not divided and extends until its lower end abuts on the metal wall of the torus chamber 7. That is, the elastic member 17 is brought into contact with not only the protruding portion 25 of the metal wall but also the metal wall of the torus chamber 7. Therefore, when the support material 15 is tightened in the direction of the protruding portion 25 of the metal wall by using two sets of bolts or the like as the fixing jig 27, the elastic member 17 together with the end portion of the impermeable sheet 16 and the protruding portion 25 of the metal And both sides of the metal wall of the torus chamber 7 are pressed against each other. The pressure welding at that time is such that the end portion of the impermeable sheet 16 is sandwiched not only between the elastic member 17 and the protruding portion 25 of the metal wall but also between the elastic member 17 and the metal wall of the torus chamber 7. It is done in. Here, in order to suppress the displacement of the water-impervious sheet 16 when the end portion of the water-impervious sheet 16 is brought into contact with and pressure-contacted with both the protruding portion 25 of the metal wall and the metal wall of the torus chamber 7, the water-impervious sheet 16 The end portion may be arranged so as to be sandwiched between the two elastic members 17.

In the embodiment shown in FIG. 8B, the number of elastic members 17 is not limited to two, and may be one, or three or more if necessary. The number of elastic members 17 can be determined according to the shape and size of the elastic body 17 and the recess 23. Further, the number of fixing jigs 27 such as bolts is not limited to two, and may be one, and may be three or more if necessary. The number of fixing jigs 27 can be determined according to the type of fixing jigs 27 and the tightening force.

In the structure of the water blocking wall shown in FIG. 8 (b), the water blocking sheet 16 is fixed on two surfaces because the pressure welding of the water blocking sheet 16 is performed on the metal protrusion 25 and the metal wall of the torus chamber 7. Can be done. As a result, water blocking or water blocking can be performed not only between the elastic member 17 and the protruding portion 25 of the metal wall but also between the elastic member 17 and the metal wall of the torus chamber 7, so that the water blocking or water blocking property is significantly improved. Improve to. Further, since the lower end of the support material 15 has a structure in contact with the metal wall of the torus chamber 7, it becomes difficult for the support material 15 to apply a rotational moment to the water blocking wall 14, and there is a strong problem that the water blocking wall collapses. Can be reduced. As described above, the water blocking wall shown in FIG. 8B has the advantages of high robustness and excellent water stopping or water blocking.

As the elastic member 17, various forms described above can be used, but when a hollow elastic tube is used, it has some advantages as compared with other elastic members. For example, after the elastic tube is brought into contact with the protruding portion 25 of the metal wall, a liquid is injected from at least one end of both ends of the elastic tube, so that the elastic tube after contact is made by the liquid injection pressure. Press contact while expanding. As a result, a large pressure contact force is obtained, so that the water blocking or water blocking performance is greatly improved. Here, by using the water pooled in the pressure suppression chamber 8 as the liquid to be used, efficient pressure welding work can be performed.

Further, in order to facilitate the attachment work of the elastic member 17, it is preferable to adopt a structure in which the elastic member 17 and the impermeable sheet 16 constituting the impermeable wall 14 are integrated. With this integrated structure, when the elastic member 17 is inserted or press-fitted into the recess 23 formed in the support material 15, the work of superimposing the elastic member 17 and the impermeable sheet 16 can be saved.

As the fixing jig, in addition to the fastening jigs such as bolts and nuts, for example, as shown in FIG. 8C, another elastic member 28 different from the elastic member 17 is used to provide the support material 15. It may be fixed by pressure contact with the protruding portion 25 of the metal wall. In the structure of the impermeable wall 14 shown in FIG. 8 (c), another elastic member 28 is inserted or press-fitted into another recess 29 formed on the surface of the support material 15 facing the surface on which the recess 23 is formed. In this state, the elastic member 17 and the end portion of the impermeable sheet 16 are pushed into the protruding portion 25 of the metal wall, and both elastic members 17 and 28 are brought into contact with the protruding portion 25 of the metal wall. At this time, if an elastic tube before injecting the liquid is used as the elastic member 17, a slight gap can be formed between the support material 15 and the protruding portion 25 of the metal wall, so that the support material 15 is made of metal. It can be easily pushed into the protruding portion 25 of the wall. After that, a liquid is injected into the elastic tube, and the elastic member 17 is pressure-welded to the protruding portion 25 of the metal wall. As a result, the effect of stopping water or blocking water can be surely obtained. Here, as another elastic member 28, a solid elastic tube may be used as in the elastic member 17. In any case, it is preferable that at least one of the elastic members 17 and 26 uses an elastic tube, and the pressure when the liquid is injected into the elastic tube is used to increase the pressure contact force. As a result, a large pressure contact force is obtained with respect to the protruding portion 25 of the metal wall, so that the water blocking or water blocking performance is improved.

<Third embodiment>
Differention of the water blocking wall structure when the inside of the dotted frame shown as the portion for water stopping or water blocking along the outer peripheral direction of the cross section inside the pressure suppression chamber 8 in FIG. 6 (a) is extracted and enlarged. A modified example of is shown in FIG. 9 in a cross-sectional view. 9 (a) to 9 (c) show the configuration of the impermeable wall 14 formed by utilizing the protruding portion 25 of the metal wall provided in each chamber of the torus chamber 7 forming the pressure suppression chamber 8. Three examples of the structure are shown. It is the same as the structure of the water blocking wall shown in FIG. 8 that the protruding portion of the metal wall is provided in both the joint of each chamber of the torus chamber 7 and the joint of each chamber of the torus chamber 7. ..

As shown in FIG. 9, in the portion for performing water stoppage or water blocking along the outer peripheral direction of the cross section inside the pressure suppression chamber 8, a part of the water stoppage wall 14 is passed through the elastic members 17, 30, 31. A part of the water blocking wall 14, elastic members 17, 30, 31 and protrusions of the metal wall inside the pressure suppression chamber 8 in a state of being in contact with the protrusion 25 of the metal wall forming the outer periphery of the cross section inside the pressure suppression chamber 8. The portion 25 is fixed by the fixing jig 27, and the elastic members 17, 30, and 31 are formed by pressure contacting the protruding portion 25 of the metal wall. Here, a part of the water blocking wall 14 means, for example, an end portion where the water blocking sheet 16 shown in FIG. 9 is close to a portion of the metal wall inside the pressure suppression chamber 8. As a part of the water blocking wall 14, in addition to the water blocking sheet 16, a thin plate or sheet made of any of metal, plastic and rubber can be used.

The water blocking wall shown in FIG. 9A has a structure in which the water blocking sheet 16 whose one side is supported by the support material 15 is fixed to the protruding portion 25 of the metal wall via the elastic member 17. Fixing is performed by making a through hole only in the impermeable sheet 16 and fastening the protruding portion 25 of the metal wall with bolts, a chassis and a nut used as a fixing jig 27. At this time, since the water-impervious sheet 16 and the protruding portion 25 of the metal wall are pressed against each other in a form of sandwiching the elastic member 17, a water-stopping or water-shielding effect can be obtained. The reason why the through hole is provided only in the impermeable sheet 16 is that the process for forming the through hole cannot be performed in the protruding portion 25 of the metal wall attached to the main body of the pressure suppression chamber 8. If it is possible to provide a through hole in the protruding portion 25 of the metal wall, the impermeable sheet 16 can be fastened to the protruding portion 23 of the metal wall via the elastic member 17, and the metal wall can be fixed more firmly. It can be performed.

The water blocking wall 14 shown in FIG. 9 (b) has a different shape from the elastic member 17 shown in FIG. 9 (a), and the area when the elastic member 30 comes into contact with the protruding portion 25 of the metal wall can be increased. It is formed using a strip. The strip-shaped elastic member 30 is provided with a through hole, and the water-impervious sheet 16 and the elastic member 30 sandwich the protruding portion 25 of the metal wall, and a fixing jig 27 for bolts, chassis, and nuts is used. It is fixed by fastening. At this time, since the impermeable sheet 16 and the protruding portion 25 of the metal wall are pressure-welded in a form of sandwiching the elastic member 30 having a large area, the metal wall is compared with the impermeable wall shown in FIG. 9 (a). The impermeable wall 14 can be more firmly fixed to the protruding portion 25 of the above, and a higher water blocking or water blocking effect can be obtained.

The structure of the water blocking wall 14 shown in FIG. 9 (c) is sandwiched between a support material 15, two water-impervious sheets 16 whose one side is supported by the support material 15, and two water-impervious sheets 16. , The elastic member 31 that abuts on the upper surface and both side surfaces of the protruding portion 25 of the metal wall so as to straddle the protruding portion 25 of the metal wall, and the water-impervious sheet 16 having a through hole sandwich the protruding portion 25 of the metal wall. In shape, it has a portion to be fastened using a bolt, chassis and nut fixing jig 27. As the elastic member 31, a member having a width wider than the elastic member 17 shown in FIG. 9A and a thickness thicker than the elastic member 30 shown in FIG. 9B is used. The water blocking wall 14 shown in FIG. 9 (c) has a structure in which the elastic member 31 sandwiched between the two water blocking sheets 16 is pressed into contact with the entire surface of the protruding portion 25 of the metal wall. It is particularly characteristic. Due to this feature, the impermeable wall 14 can be more firmly fixed to the protruding portion 25 of the metal wall, and the water blocking or water blocking performance can be significantly improved. Therefore, the effect of water blocking or water blocking is higher than that of the water blocking wall shown in FIG. 9A.

As the elastic members 17, 30 and 31 shown in FIG. 9, it is preferable to use a hollow elastic tube for the same reason as in the first and second embodiments. Further, in order to facilitate the attachment work of the elastic members 17, 30 and 31, the elastic members 17, 30 or 31 having a structure integrated with the impermeable sheet 16 constituting the impermeable wall 14 are used. It is preferable to do so. In the elastic member 29 shown in FIG. 9 (c), the elastic member 31 may be integrated with the two impermeable sheets 16, or may be integrated with only one of the two impermeable sheets 16. It may be a thing.

<Fourth Embodiment>
The water blocking wall of the present invention is not only provided in a single layer on at least one of the regions (region (I) shown in FIG. 6) surrounded by two adjacent locations of the water blocking wall 14, but also at that location. It may be provided in parallel in two or more layers. FIG. 10 is a diagram illustrating an example of a method for forming a water blocking wall in a pressure suppression chamber having a double water blocking wall. As shown in FIG. 10A, the water blocking wall 14 is a metal wall inside the torus chamber 7 forming the pressure suppression chamber 8 on both sides of the region (I), where there is no protrusion and where there is a protrusion. It is formed in double at two places, and a total of four water blocking walls are represented by 14a, 14b, 14c and 14d, respectively. In the present embodiment, as an example, the water blocking walls 14a and 14b have the structure shown in FIG. 7 (c), and 14c and 14d have the structure shown in FIG. 9 (b), respectively.

In the group of water stop walls 14 shown in FIG. 10, first, water stop walls 14c and 14d are formed, and then water stop walls 14a and 14b are formed. The pool water 13 contained in the region (I) surrounded by the water blocking walls 14c and 14d is transferred to another chamber (region (II) and / or (III)). At the same time, the pool water 13c existing between the water blocking walls 14a and 14c and between the water blocking walls 14d and 14b is also relocated. At this time, it is not always necessary to relocate all of the pool water 13c existing between the water stop walls 14a and 14c and between the water stop walls 14d and 14b, respectively, and the water level of the pool water is the area of the relocation destination ( The pool water 13 may be relocated so as to be lower than that of II) and / or (III). After the relocation of the pool water 13, as shown in FIG. 10 (b), the area (I) surrounded by the water blocking walls 14c and 14d is used for maintenance work for inspection and maintenance. It is used as a room with a space of.

The height of the elastic member 17 formed in the present embodiment is the pool water 13a contained in the pressure suppression chamber 8 formed after the transfer step of the pool water 13 along the outer peripheral direction of the cross section inside the pressure suppression chamber 8. It is arranged at a height exceeding the position where the water surface of 13b is the highest. Thereby, it is possible to prevent the pool water existing in the area (II) and / or (III) from getting over the water blocking wall 14 and entering the area (I) after the transfer.

After that, inside the pressure suppression chamber 8, the metal wall of the pressure suppression chamber 8 belonging to the region (I) is subjected to maintenance work for inspection and maintenance in addition to the cleaning work. If minute cracks or paint peeling are found on the metal wall belonging to the region (I), they are repaired and repainted.

After the maintenance work, the pool waters 13a and 13b transferred to the area (II) and / or (III) are transferred to the original area (I) and returned. The pool waters 13a and 13b are also transferred to the regions between the water blocking walls 14a and 14c and between the 14b and 14d. After that, the water blocking walls 14 are removed in the order of the water blocking walls 14a and 14b, and then 14c and 14d. After that, after returning the pressure suppression chamber to the initial state, checking for any abnormality in the reactor, and if there is no abnormality, the operation is restarted. Note that FIG. 10 does not show the steps after the transfer of the pool waters 13a and 13b to the region (I).

In FIG. 10, one place is shown as the room provided as the area (I), but in this embodiment, there may be two or more places in any place.

Further, as the water blocking wall 14 shown in FIG. 10, the one having the structures shown in FIGS. 7 (d) and 9 (b) was applied as an example, but in the present embodiment, FIGS. 7 to 9 are applied. At least one of the structures of the waterproof wall shown in the above can be adopted. Further, the water blocking wall 14 does not need to be provided at two places of the metal wall inside the torus chamber 7 forming the pressure suppression chamber 8 at the same time, a place without protrusions and a place with protrusions, and two places of the metal wall without protrusions. It may be provided in.

In this way, by providing the water blocking wall 14 in parallel with at least one of the locations in the region surrounded by the two adjacent locations (the region (I) shown in FIG. 10) in parallel, the water blocking and water blocking are performed. The design safety factor can be greatly increased with respect to the effect of. The water blocking wall formed in the present embodiment is not limited to two layers, and may be provided in three or more layers on one side of the region (I) from the viewpoint of water blocking and water blocking performance and safety. However, in consideration of both reduction of the installation cost of the water blocking wall 14 and improvement of safety, it is practical to provide the water blocking wall in duplicate when providing the water blocking wall multiple times on one side.

As described above, the method for forming a water blocking wall and the structure of the water blocking wall in the pressure suppression chamber according to the present invention efficiently form a water blocking wall for water blocking or water blocking in pool water in a short period of time. Not only that, the pool water can be reliably stopped and blocked in the pressure suppression chamber. In particular, it is possible to significantly improve the performance of water blocking or water blocking in the portion of the pressure suppression chamber in the outer peripheral direction of the cross section, which is a major technical problem when constructing the water blocking wall. Further, even if the aerial chamber provided by transferring the pool water to another place in the pressure suppression chamber after the formation of the water blocking wall causes a large head pressure difference with other parts. It has excellent robustness and can exhibit high water stopping property or water shielding property. Further, the present invention not only has high robustness against water blocking or water blocking, but also, unlike the conventional welding method, it is easy to remove and remove the water blocking wall after maintenance work.

The present invention can be mainly applied when performing maintenance work involving the relocation of pool water in an existing pressure suppression chamber containing pool water, but since the above effects are obtained, the present invention can be applied to the pressure suppression chamber. It can be applied to the case where only new water is injected after all the pool water has been relocated, and the application can be expanded to various uses.

1 ... Nuclear plant 2 ... Reactor building 3 ... Reactor containment vessel 4 ... Drywell 5 ... Reactor pressure vessel 6 ... Support 7 ... Taurus room 8 ...・ Pressure suppression chamber 9 ・ ・ ・ Water leakage prevention wall 10 ・ ・ ・ Vent pipe 11 ・ ・ ・ Vent head 12 ・ ・ ・ Down jig 13 ・ ・ ・ Pool water 14 ・ ・ ・ Water stop wall 15, 24 ・ ・ ・ Support material 16 ... Impermeable sheets 17, 28, 30, 31 ... Elastic members 18 ... Recesses formed by jigs 19 ... Metal wall parts 20 ... H-shaped jigs 21 ... -U-shaped jig 22 ... Elastic member integrated with the impermeable sheet 23 ... Recessed portion 25 formed in the support material ... Protruding portion 26 of the metal wall ... Micro protrusion 27 ... Fixing jig 29 ... Another recess formed in the support material

Claims (19)

It is a method of forming a water blocking wall for stopping or blocking pool water inside the pressure suppression chamber inside the reactor building.
It has a step of partitioning the pressure suppressing chamber into two or more chambers by providing the water blocking walls at at least two or more places in the pressure suppressing chamber.
At least one side of the water blocking wall is supported by a support material provided in the pressure suppressing chamber, and a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppressing chamber is the pressure suppressing. The pressure suppression chamber together with a part of the water blocking wall, in a state where an elastic member having a shape along the outer periphery of the cross section of the indoor portion is directly supported by the support material or indirectly via another member. A method for forming a water blocking wall in a pressure suppression chamber, which is formed by a method of abutting a desired position of a portion of a metal wall constituting the outer periphery of an internal cross section or a protruding portion of the metal wall to perform pressure welding. It is formed in the recess of a jig in which a recess is formed in at least one of the U-shaped, I-shaped, and H-shaped groups supported by the support material, or at the end of the support material. In a state where the elastic member is inserted or press-fitted into the recess together with a part of the water blocking wall, at a position where the elastic member is to be brought into contact with the metal wall portion constituting the outer periphery of the cross section of the pressure suppression chamber. By arranging and supporting the jig or the support material and abutting the elastic member against the metal wall portion to perform pressure welding, water is stopped or water-shielded along the outer peripheral direction of the cross section of the pressure suppression chamber. The method for forming a water blocking wall in a pressure suppression chamber according to claim 1, wherein a portion for performing the above is formed. In a state where the elastic member is inserted or press-fitted together with a part of the water blocking wall into a recess formed in a part of the support material, the protrusion portion of the metal wall constituting the outer periphery of the cross section of the pressure suppression chamber is described. The cross section of the pressure suppression chamber is formed by arranging the support material at a position where the elastic member is to be brought into contact, supporting or fixing the elastic member, and contacting the elastic member with the protruding portion of the metal wall to perform pressure welding. The method for forming a water blocking wall in a pressure suppression chamber according to claim 1, wherein a portion for stopping or blocking water is formed along the outer peripheral direction. The water blocking wall, the elastic member, and the metal wall in a state where a part of the water blocking wall is in contact with the protruding portion of the metal wall constituting the outer periphery of the cross section of the pressure suppression chamber through the elastic member. By fixing the protruding portion of the metal wall with a fixing jig and pressing the elastic member against the protruding portion of the metal wall, water can be stopped or blocked along the outer peripheral direction of the cross section of the pressure suppression chamber. The method for forming a water blocking wall in a pressure suppression chamber according to claim 1, wherein a portion is formed. The elastic member is a hollow elastic tube.
By injecting at least one of the group consisting of air, gas, and liquid into the inside of the elastic tube, and pressing the portion of the metal wall constituting the outer periphery of the cross section of the inside of the pressure suppression chamber, the inside of the pressure suppression chamber is pressed. The method for forming a water blocking wall in a pressure control chamber according to any one of claims 1 to 4, wherein a portion for stopping or blocking water is formed along the outer peripheral direction of the cross section. By using the pool water pooled in the pressure suppression chamber and injecting the pool water into the inside of the elastic tube, the metal wall portion constituting the outer periphery of the cross section of the pressure suppression chamber is pressed against each other. The method for forming a water blocking wall in a pressure suppressing chamber according to claim 5, wherein a portion for stopping or blocking water is formed along the outer peripheral direction of the cross section of the pressure suppressing chamber. The claim is characterized in that the elastic member arranged in a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppressing chamber has a structure integrated with the water blocking wall. The method for forming a water blocking wall in a pressure suppression chamber according to any one of 1 to 6. A step of providing a water blocking wall for stopping or blocking the pool water at at least two or more places in the pressure suppressing chamber in the pool water included in the pressure suppressing chamber.
It has a transfer step of transferring all or a part of water contained in a room surrounded by two adjacent places of the water blocking wall to the outside of the room surrounded by two adjacent places of the water blocking wall.
The pressure according to any one of claims 1 to 7, wherein a chamber having a small amount of pool water or a chamber containing no pool water is formed in at least one place in the pressure suppression chamber by the transfer step. Method of forming a water blocking wall in the suppression chamber. The elastic member is arranged along the outer peripheral direction of the cross section of the pressure suppression chamber at a height exceeding the position where the water surface of the pool water contained in the pressure suppression chamber formed after the transfer step becomes the highest. The method for forming a water blocking wall in a pressure control chamber according to claim 8. The water blocking wall has a structure composed of two or more walls.
The portion for performing water blocking or water blocking along the outer peripheral direction of the cross section of the pressure suppression chamber is formed by the method for forming a water blocking wall according to at least any one of claims 1 to 9. The water stoppage in the pressure suppression chamber according to any one of claims 1 to 9, wherein the water is provided in parallel at least one of the two adjacent locations in a region surrounded by two adjacent locations with two or more layers. Wall forming method. It is a structure of a water blocking wall provided inside the pressure suppression chamber in order to partition the pressure suppression chamber inside the reactor building.
With the waterproof wall
A support material that supports at least one side of the waterproof wall, and
As a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber, an elastic member having a shape along the outer periphery of the cross section of the pressure suppression chamber is directly or by the support material. A desired portion of the metal wall, or a protruding portion of the metal wall, which, together with a part of the water blocking wall, constitutes the outer periphery of the cross section of the pressure suppression chamber, while being indirectly supported via another member. A structure of a water blocking wall in a pressure suppression chamber, characterized by having a portion formed by abutting a position and performing pressure welding. The portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber is
A recess was formed in at least one of a group consisting of a U-shape, an I-shape, and an H-shape, which was supported by abutting against a metal wall portion constituting the outer periphery of the cross section of the pressure suppression chamber. With the elastic member inserted or press-fitted together with a part of the water blocking wall into the recess formed with the jig or the recess formed at the end of the support material.
The jig or the support material supported by arranging the elastic member at a position where the elastic member is to be brought into contact with the metal wall portion constituting the outer periphery of the cross section of the pressure suppression chamber.
The structure of a water blocking wall in a pressure suppressing chamber according to claim 11, wherein the elastic body has a portion that is in contact with and is pressed against the portion of the metal wall along the outer peripheral direction of the cross section of the pressure suppressing chamber. The portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber is
The elastic member inserted or press-fitted together with a part of the water blocking wall into a recess formed in a part of the support material.
The support material, which is arranged and supported or fixed at a position where the elastic member is to be brought into contact with the protruding portion of the metal wall constituting the outer periphery of the cross section of the pressure suppression chamber,
The structure of a water blocking wall in a pressure suppressing chamber according to claim 11, wherein the elastic member is in contact with a protruding portion of the metal wall along the outer peripheral direction of a cross section of the pressure suppressing chamber. The portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppression chamber is
The water blocking material, the elastic member, and the metal wall in a state where a part of the water blocking wall is in contact with the protruding portion of the metal wall constituting the outer periphery of the cross section of the pressure suppression chamber through the elastic member. 11. The structure of a water blocking wall in a pressure suppression chamber according to claim 11, wherein the elastic member has a structure of being pressed against the protruding portion of the metal wall by fixing the protruding portion of the metal wall with a fixing jig. .. The pressure suppression according to any one of claims 11 to 14, wherein the elastic member is an elastic tube in which at least one of a group consisting of air, gas and liquid is injected into a hollow portion. The structure of the waterproof wall in the room. The structure of a water blocking wall in a pressure suppression chamber according to claim 15, wherein the elastic member is an elastic tube in which water pooled in the pressure suppression chamber is injected into the hollow portion. The claim is characterized in that the elastic member arranged as a portion for stopping or blocking water along the outer peripheral direction of the cross section of the pressure suppressing chamber has a structure integrated with the water blocking wall. The structure of a water blocking wall in a pressure suppression chamber according to any one of 11 to 16. Claims 11 to 17 are characterized in that the elastic member has a structure in which the elastic member is arranged at a height of ½ or more of the cross-sectional diameter of the pressure suppression chamber along the outer peripheral direction of the cross section of the pressure suppression chamber. The structure of the water blocking wall in the pressure control chamber according to any one of the above. The structure of the water stop wall according to at least one of claims 11 to 18, wherein the water stop wall has a portion for performing water stop or water shield along the outer peripheral direction of the cross section of the pressure suppression chamber. The structure of the water blocking wall in the pressure suppression chamber is characterized by having a structure provided in parallel with at least one of the locations in the region surrounded by the two adjacent locations of the water blocking wall.

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