Airtight structure

Abstract

To provide an airtight structure with a simple structure capable of ensuring airtightness of a nuclear facility without breaking even with displacement between a building structure and the same while withstanding harsh environments (high temperature, radiation, steam).SOLUTION: An airtight structure 30 is an airtight structure for ensuring airtightness by closing the gap. The airtight structure includes: a film material 4 having a property capable of welding overlapped portions; a holding plate 10 for holding one surface of the film material 4; a mounting plate 3 that presses the other side of the film material 4 and is attached to a structure or reactor building; a heat-insulating double-sided tape 9 that is interposed between the film material 4 and the holding plate 10 to bond both members; a heat-resistant film 8 interposed between the film material 4 and the mounting plate 3; a bolt 6 that penetrates the film material 4, the holding plate 10, the mounting plate 3, the heat-insulating double-sided tape 9, and the heat-resistant film 8; and a nut 6 N screwed with the bolt 6. By tightening the bolt 6 and the nut 6 N, the film material 4, the holding plate 10, the mounting plate 3, the heat-insulating double-sided tape 9, and the heat-resistant film 8 are fixed in layers.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an airtight structure that closes the gap between a stand (hereinafter, "mounting stand") for mounting a door closing device, which is used when installing a door closing device to close an opening when a blowout panel (hereinafter, "BOP") installed at a nuclear facility is opened, and a building structure. [Background technology]

[0002] Under the new regulations, nuclear facilities will be required to install a door closing device to close the opening when the BOP is opened to release pressure that has increased due to an accident inside the building. The door closing device is required to ensure the airtightness of the reactor building while closing the opening.

[0003] The door closing device is installed in an existing nuclear facility using a mounting rack, etc. Since the mounting rack, etc. is installed in an existing nuclear facility, gaps and openings are generated between the mounting rack, etc. and the nuclear facility, and these have various shapes.

[0004] Due to the above gaps and openings, the airtightness of the reactor building required for the door closing device cannot be satisfied. The structure that closes the gap between the mounting base etc. and the nuclear facility must be able to fit complex openings, be installed in harsh environments (high temperature, radiation, steam), and not break even when the nuclear facility and the mounting base etc. are displaced, while ensuring the same airtightness as the BOP.

[0005] For example, a structure for closing gaps between building structures is described in Patent Document 1. Patent Document 1 states, "The tongue portion of a sealing packing is fixed to the tip of a leaf spring, and the cylindrical portion is maintained in a state pressed against the bottom surface of the building structure by the restoring force of the leaf spring. Also, a plate-shaped water-stop rubber is hung between the outer wall surface of the foundation structure and the outer surface of the building structure to close the gap between the foundation structure and the building structure, thereby preventing water from entering below the building." [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2014-43709 A Summary of the Invention [Problem to be solved by the invention]

[0007] Patent Document 1 describes a structure that can prevent water from entering gaps between building structures by combining the restoring force of leaf springs and waterproof rubber.

[0008] However, the structure disclosed in Patent Document 1 is a double structure consisting of a section that bears the displacement between the building structures and a section that blocks the gaps, making it a complex structure. In addition, the structure is designed primarily to prevent water ingress, and airtight measures have not been fully considered. As the structure involves pressing down the watertight rubber with a pressing plate, the gaps can become leaks, and there is a risk that sufficient airtightness cannot be ensured to ensure the airtightness of the nuclear facility.

[0009] In addition, measures against the harsh environments specific to nuclear facilities (high temperatures, radiation, steam) have not been fully considered, and the effects of heat, radiation, and steam may cause gaps in the fixed parts to become leaks, making it difficult to ensure sufficient airtightness for the nuclear facility.

[0010] The present invention has been made to solve the above-mentioned problems, and aims to provide an airtight structure that has a simple structure, can withstand harsh environments (high temperatures, radiation, steam), and can ensure the airtightness of a nuclear facility without being damaged by displacement between building structures. [Means for solving the problem]

[0011] In order to achieve the above object, the airtight structure of the present invention is an airtight structure for sealing a gap between a reactor building and a structure provided at a distance from the reactor building to ensure airtightness, the airtight structure comprising: a membrane material having a property capable of welding an overlapping portion; The aboveA pressing plate that presses one side of the membrane material; The above Hold the other side of the membrane, The above Structure or The above a mounting plate that is attached to the reactor building; The above Membrane material and The above A heat-insulating adhesive member (e.g., a heat-insulating double-sided tape 9) is interposed between the pressing plates to bond the two members together; The above Membrane material and The above A heat-resistant film interposed between the mounting plates; The above membrane material, The above Retaining plate, The above Mounting plate, The above Heat-insulating adhesive materials and The above A bolt penetrating the heat-resistant film; The above A nut that is screwed onto the bolt, The above Bolt and The above By tightening the nut The pressing plate, the heat insulating adhesive member, the film material, the heat resistant film, and the mounting plate are sequentially The present invention is characterized in that the polymer is fixed in a layer shape. Other aspects of the present invention will be described in the embodiments described later. Effect of the Invention

[0012] According to the present invention, it is possible to provide an airtight structure which is simple in structure, can withstand harsh environments (high temperatures, radiation, steam), and can ensure the airtightness of a nuclear facility without being damaged by displacement between building structures. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing an airtight structure for sealing a gap between a reactor building according to an embodiment of the present invention and a structure provided at a distance from the reactor building to ensure airtightness. [Diagram 2] 1 is a cross-sectional view showing an overall configuration of an airtight structure according to an embodiment of the present invention. [Diagram 3] 3 is an enlarged view showing the airtight structure shown in FIG. 2. [Figure 4] FIG. 13 is a detailed view of a modified airtight structure having a four-layer membrane material. [Diagram 5]3A and 3B are explanatory views showing a state in which the airtight structure shown in FIG. 2 is used in a curved portion, where (a) is a perspective view and (b) is a Vb-Vb sectional view. [Figure 6] 3A to 3C are explanatory views showing a state in which the airtight structure shown in FIG. 2 is used in a corner portion, where (a) is a perspective view, (b) is a VIb-VIb cross-sectional view, and (c) is a VIc-VIc cross-sectional view. [Figure 7] FIG. 2 is an explanatory diagram showing an example of an application location of the airtight structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic diagram showing an airtight structure 30 for sealing a gap between a reactor building and a structure provided at a distance from the reactor building to ensure airtightness according to an embodiment of the present invention. Fig. 2 is a cross-sectional view showing the entire airtight structure 30 according to an embodiment of the present invention. Fig. 2 is a cross-sectional view taken along II-II in Fig. 1. Fig. 3 is an enlarged view showing the airtight structure 30 shown in Fig. 2.

[0015] FIG. 7 is an explanatory diagram showing an example of an application location of the airtight structure 30. First, an application example of the airtight structure 30 will be described. The door closing device 40 shown in FIG. 7 is an example of a door closing device provided on the wall of the MS tunnel. A nuclear power generation facility includes a reactor building in which a reactor pressure vessel is stored, a turbine building in which a turbine rotated by steam pumped from the reactor pressure vessel is stored, and an MS tunnel room connecting the reactor building and the turbine building. The MS tunnel room is also called a main steam pipe tunnel room (MSIV room). The MS tunnel room wall is provided with a BOP and the like that is pushed out to the outside of the reactor building and removed when the internal pressure abnormally rises to release the internal pressure. The door closing device 40 has a function of closing the opening when the BOP is opened. The airtight structure 30 described in this embodiment closes the gap between the mounting base 2 for mounting the door closing device 40 and the building structure 1.

[0016] When a building structural body 1 on the wall of a reactor building and a mounting base 2 (structural body) on which a door closing device 40 for closing the opening when the BOP is opened are separated, it is necessary to ensure airtightness in the gap between them. In this embodiment, an airtight structure 30 using a mounting plate 3, a weldable membrane material 4, etc. between the building structural body 1 and the mounting base 2 will be described.

[0017] In Fig. 2, the upper side of the paper is the outside of the airtight structure 30, and the lower side of the paper is the inside of the airtight structure 30. In the airtight structure 30 of Fig. 2, a weldable membrane material 4 is attached to a mounting plate 3 fixed to a building structural body 1 and a mounting frame 2. Here, the welded portion 5 of the membrane material 4 refers to the portion where the membrane materials overlap and contact each other. The mounting plate 3 fixed to the building structural body 1 or the mounting frame 2 is coated to maintain airtightness. Details of the airtight structure 30 will be described with reference to Fig. 3.

[0018] 3, the airtight structure 30 includes a membrane material 4 having a property that allows the overlapping portions to be welded, a pressing plate 10 that presses one side of the membrane material 4, a mounting plate 3 that presses the other side of the membrane material 4 and is attached to a structure (e.g., a mounting frame 2) or a reactor building (e.g., a building structure 1), a heat insulating double-sided tape 9 (heat insulating adhesive member) interposed between the membrane material 4 and the pressing plate 10, a heat resistant film 8 interposed between the membrane material 4 and the mounting plate 3, a bolt 6 that penetrates the membrane material 4, the pressing plate 10, the mounting plate 3, the heat insulating double-sided tape 9, and the heat resistant film 8, and a nut 6N that screws into the bolt 6. The membrane material 4, the pressing plate 10, the mounting plate 3, the heat insulating double-sided tape 9, and the heat resistant film 8 are fixed in layers by tightening the bolt 6 and the nut 6N.

[0019] That is, the weldable membrane material 4 is provided with a through hole for passing the bolt 6. The penetration part of the bolt 6 is folded back to form a double structure, and the strength is maintained by welding. Here, the weldable membrane material 4 is prevented from twisting by folding back so as to wrap the core material 7.

[0020] The weldable membrane material 4 with the through holes is sandwiched between a heat-resistant film 8 on the outside of the airtight structure 30 and a heat-insulating double-sided tape 9 on the inside of the airtight structure 30, and is fixed with a bolt 6 and a nut 6N while being pressed down by a pressing plate 10 and a mounting plate 3. By providing the heat-resistant film 8 between the weldable membrane material 4 and the mounting plate 3, heat in the harsh environment specific to a nuclear reactor facility is prevented from being transmitted to the fixing part of the mounting plate 3. This prevents thermal deformation of the fixing part. In addition, by providing the heat-insulating double-sided tape 9 between the pressing plate 10 and the weldable membrane material 4, the surface of the weldable membrane material 4 and the mounting plate 3 are kept in close contact with each other.

[0021] A silicon washer 11 having excellent compression and heat insulating properties is used between the head of the bolt 6 inside the airtight structure and the presser plate 10, thereby maintaining a tight contact state between the presser plate 10 and the bolt 6 inside the airtight structure.

[0022] As a result, even if a three-dimensional displacement occurs between the building structure 1 and the mounting base 2, the weldable membrane material 4 bears the displacement, and the airtightness of the fixed portion is maintained even in a harsh environment.

[0023] Fig. 4 is a detailed view of a modified example of the airtight structure 30 in which the membrane material 4 has a four-layer structure. Fig. 4 shows a cross-sectional view of an airtight structure using the weldable membrane material 4 and the mounting plate 3 shown in Figs. 2 and 3, in which the membrane material 4 has a four-layer structure in order to increase the strength of the penetration part of the bolt 6. The four-layer structure is achieved by providing a heat insulating double-sided tape 9 between the weldable membrane material 4 and another weldable membrane material 12 that is newly provided. Other members used and the method of fixing the members are the same as those shown in Figs. 2 and 3.

[0024] FIG. 5 is an explanatory diagram showing a state where the airtight structure 30 shown in FIG. 2 is used in a curved portion, (a) being a perspective view, and (b) being a Vb-Vb cross-sectional view. FIG. 5(a) is a perspective view showing a state where the airtight structure 30 shown in FIG. 2 and FIG. 3 is used in a three-dimensional curved portion. A weldable film material 4 is sandwiched and fixed between a curved mounting plate 3C and a curved pressing plate 10C. Here, the welded portion 5 of the film material 4 refers to the portion where the film materials overlap and contact each other. In addition, the members and their configurations between the curved mounting plate 3C and the curved pressing plate 10C are the same as those in the embodiment shown in FIG. 2 and FIG. 3.

[0025] The strength is maintained by folding back the weldable membrane material 4 and welding the double-layered membrane material, and the weldable membrane material 4 is prevented from twisting by folding back so as to wrap around the core material 7. Here, by using a curved core material 15 for the curved portion, it is possible to fold back the weldable membrane material 4 even at the curved location and prevent twisting. The curved core material 15 may be one integrated with the core material 7 and bent as is for use, or a new core material may be bent and welded to the core material 7 to be integrated.

[0026] FIG. 6 is an explanatory diagram showing a state where the airtight structure 30 shown in FIG. 2 is used at a corner, (a) is a perspective view, (b) is a VIb-VIb cross-sectional view, and (c) is a VIc-VIc cross-sectional view. FIG. 6(a) is a perspective view showing a state where the airtight structure 30 shown in FIG. 2 and FIG. 3 is used at a three-dimensional corner. A weldable film material 4 is sandwiched and fixed between an L-shaped mounting plate 3L and an L-shaped pressing plate 10L. Here, the welded portion 5 of the film material 4 refers to a portion where the film materials overlap and contact each other. In addition, the members and their configurations between the L-shaped mounting plate 3L and the L-shaped pressing plate 10L are the same as those in the embodiment shown in FIG. 2 and FIG. 3.

[0027] The weldable membrane material 4 is folded back and welded to form a double-layered membrane material, thereby maintaining its strength, and the weldable membrane material 4 is prevented from twisting by being folded back so as to wrap around the core material 7. Here, the L-shaped corner has a corner structure 18 without the core material 7. Here, as shown in Fig. 6(c), the upper membrane material 4 and the lower membrane material 4 are independent, but by folding back the end portion, it is overlapped on the lower membrane material 4 and welded to form a welded structure 19, which allows the L-shaped corner to be sealed.

[0028] According to this embodiment, the reactor building can be adapted to complex gaps and openings formed between a reactor building (e.g., the building structural body 1) and a structure (e.g., the mounting base 2) spaced apart from the reactor building, and can be installed in harsh environments (high temperatures, radiation, steam) without being damaged by displacement of the building structural body, ensuring the airtightness of the reactor building.

[0029] The membrane material 4 is selected from a combination of materials such as resin and glass fiber, and has heat resistance to withstand the temperature environment of a nuclear facility, appropriate flexibility to absorb displacement between buildings, sufficient toughness, and weather resistance to withstand radiation and steam environments, but the materials used for the membrane material 4 are not limited to resin and glass fiber.

[0030] In addition, since the membrane material 4 has bolt holes at the fixed parts between the mounting plate 3 and the pressure plate 10, by using a material that has the property of being able to be "welded" by simply overlapping the membrane materials and applying heat treatment to bond them together, the strength around the bolt holes can be maintained without compromising airtightness.

[0031] According to the airtight structure 30 of this embodiment, it is possible to provide an airtight structure that satisfies the requirements that it is suitable for any shape of gap or opening formed between the mounting base 2 of the door closing device 40 and the existing reactor building, that it can be installed in a harsh environment (high temperature, radiation, steam), and that it will not break even if the reactor building and the mounting base are displaced, while ensuring airtightness equivalent to that of the door closing device 40. The door closing device 40 includes a sliding type door closing device, a side-opening type door closing device, and the like, and the airtight structure 30 of this embodiment can be applied to the mounting bases of various door closing devices. [Explanation of symbols]

[0032] 1 Building structure (nuclear building) 2 Mounting stand (structure) 3 Mounting plate 3C Curved mounting plate 3L L-shaped mounting plate 4 Membrane material 5 Welded area 6 Volts 6N Nut 7 Core material 7C Curved core 8. Heat-resistant film 9. Insulating double-sided tape (insulating adhesive material) 10 Retaining plate 10C Curved pressure plate 10L L-shaped pressure plate 11 Silicone washer 12 The other weldable membrane material 18 Corner structure (L-shaped corner without core material) 19 Welded structure (structure in which individual membrane materials are welded together) 30 Airtight structure 40 Door closing device

Claims

1. An airtight structure for sealing a gap between a reactor building and a structure provided at a distance from the reactor building to ensure airtightness, A membrane material having a property capable of welding the overlapping portions; A pressing plate that presses one side of the membrane material; a mounting plate that holds the other surface of the membrane material and is attached to the structure or the reactor building; A heat insulating adhesive member is interposed between the membrane material and the pressing plate to bond both members; a heat-resistant film interposed between the membrane material and the mounting plate; a bolt penetrating the membrane material, the pressing plate, the mounting plate, the heat insulating adhesive member, and the heat resistant film; A nut that is screwed onto the bolt, The bolts and nuts are fastened together to fix the pressure plate, the heat insulating adhesive member, the membrane material, the heat resistant film, and the mounting plate in layers. An airtight structure characterized by:

2. A core material is provided on the inside of the folded portion for overlapping the membrane material.

2. The airtight structure according to claim 1.

3. The airtight structure includes two of the membrane materials that can be welded and have bolt through holes that are provided with the core material on the inside of the folded portion.

3. The airtight structure according to claim 2.

4. The pressure plate is a curved pressure plate, The mounting plate is a curved mounting plate.

2. The airtight structure according to claim 1.

5. The pressing plate is an L-shaped pressing plate, The mounting plate is an L-shaped mounting plate.

2. The airtight structure according to claim 1.

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