JP7360991B2 - Seal material support, seal structure including this seal material support, and sealing method - Google Patents

Description

The present disclosure relates to a seal material support, a seal structure including the seal material support, and a sealing method.

For example, in a nuclear power plant, an equipment hatch is provided in a penetration portion formed in a building frame, and a gap between the building frame and the equipment hatch is sealed with a sealing material, such as caulking, thereby performing water-stopping treatment. Although the construction target is completely different, Patent Document 1 discloses that a joint member main body part that can spread in the width direction of the gap is inserted into a joint part formed between the end faces of wall members, and the end faces of the wall members and the joint member main body are inserted. A sealing structure is disclosed that seals the gap by providing an elastic body between the two parts.

Japanese Patent Application Publication No. 11-324149

However, in a nuclear power plant, when water floods above the structure and water pressure is applied to the caulking installed in the gap between the structure and equipment hatches, the water pressure deforms the caulking and eventually breaks, allowing the water to pass through the penetrating parts and penetrate the structure. There was a problem that water could leak downward. Even in the seal structure described in Patent Document 1, when the water pressure applied to the elastic body becomes large, there is a risk that the elastic body may be damaged and water may leak between the wall members.

In view of the above-mentioned circumstances, at least one embodiment of the present disclosure includes a sealing material support that can improve the sealing strength of the outer peripheral gap formed between the outer peripheral surface of the hatch and the frame, and this sealing material support. The present invention aims to provide a sealing structure and a sealing method.

In order to achieve the above object, the sealing material support according to the present disclosure seals the outer circumferential gap formed between the outer circumferential surface of at least one hatch and the frame, or the intermediate gap between adjacent hatches among a plurality of hatches. A sealing material support for supporting a sealing material that is attached to the sealing material, comprising a fixing part including an installation surface and a supporting part including a supporting surface for supporting the sealing material, the fixing part and the supporting part being mutually are connected, and the installation surface and the support surface are separated at the connection part, and when the installation surface is extended so that the installation surface and the support surface intersect, the support surface is separated from the installation surface. The angle formed by the support surface and the extension surface on the side facing the extension surface is an acute angle.

According to the seal material support of the present disclosure, the seal material support supports the seal material provided in the outer peripheral gap formed between the outer peripheral surface of the hatch and the frame, so that even if pressure is applied to the seal material, Since the risk of damage to the sealing material can be reduced, the sealing strength of the outer circumferential gap can be improved.

FIG. 1 is a plan view of a seal structure according to Embodiment 1 of the present disclosure. 2 is a sectional view taken along line II-II in FIG. 1. FIG. FIG. 2 is a cross-sectional view of the sealant support according to Embodiment 1 of the present disclosure, taken along a plane perpendicular to the longitudinal direction of the sealant support. FIG. 7 is a cross-sectional view of a modification of the seal material support according to Embodiment 1 of the present disclosure. FIG. 7 is a cross-sectional view of another modification of the seal material support according to Embodiment 1 of the present disclosure. FIG. 3 is a cross-sectional view of a modification of the seal structure according to Embodiment 1 of the present disclosure. FIG. 7 is a plan view of a seal structure according to Embodiment 2 of the present disclosure. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. FIG. FIG. 7 is a plan view of a seal structure according to Embodiment 3 of the present disclosure. 10 is a sectional view taken along line XX in FIG. 9. FIG. FIG. 7 is a cross-sectional view of a modification of the seal structure according to Embodiment 3 of the present disclosure. FIG. 3 is a cross-sectional view of another modification of the seal structure according to Embodiment 1 of the present disclosure.

Hereinafter, a seal material support, a seal structure including this seal material support, and a sealing method according to an embodiment of the present disclosure will be described based on the drawings. These embodiments represent one aspect of the present disclosure, do not limit this disclosure, and can be arbitrarily modified within the scope of the technical idea of the present disclosure.

(Embodiment 1)
<Configuration of seal material support and seal structure according to Embodiment 1 of the present disclosure>
As shown in FIG. 1, a hatch 3 is installed within a penetration portion 2 formed in a framework 1 of a nuclear power plant. The seal structure 10 according to the first embodiment of the present disclosure seals the outer circumferential gap 4 formed between the outer circumferential surface 3a of the hatch 3 and the frame 1. The configuration of the hatch 3 is not particularly limited, and in this disclosure, the hatch 3 will be described using an equipment hatch 100 of a reactor containment vessel as an example. In the first embodiment, the equipment hatch 100 is a concrete hatch. A hanging fitting 110 for hanging the equipment hatch 100 is provided on the upper surface of the equipment hatch 100.

As shown in FIG. 2, the penetrating part 2 includes an upper part 21 including an opening 20 that opens to the upper surface 1a of the frame 1, and a lower part located below the upper part 21 and having a width smaller than that of the upper part 21. 22. An L-shaped steel 24 is provided along the periphery of the opening 20, and the L-shaped steel 24 is prevented from coming off by, for example, an anchor stud. Since the L-shaped steel 24 is provided flush with the upper surface 1a of the frame 1, the upper surface of the L-shaped steel 24 constitutes a part of the upper surface 1a of the frame 1. An L-shaped steel 25 is provided at the boundary between the upper part 21 and the lower part 22, and the L-shaped steel 25 is prevented from coming off by, for example, an anchor stud. The L-shaped steel 25 constitutes a stepped portion 23 at the boundary between the upper portion 21 and the lower portion 22. Metal plates 26 and 27 are provided along the inner surfaces of the upper part 21 and the lower part 22, respectively. The plates 26, 27 can be fixed to the L-beams 24, 25 by welding.

The equipment hatch 100 includes a hatch upper part 101 having a width slightly smaller than the width of the upper part 21 and a hatch lower part 102 located below the hatch upper part 101 and having a width slightly smaller than the width of the lower part 22. There is. The equipment hatch 100 has an upper hatch 101 located within the upper part 21 , a lower hatch 102 located within the lower part 22 , and a lower surface 103 of the upper hatch 101 supported by the stepped part 23 to form a through-hole. It is located within 2.

The sealing structure 10 includes a metal sealing material support 30 and a sealing material 5, such as silicone-based caulking. As shown in FIG. 3, the sealing material support 30 includes a fixing portion 31 and a supporting portion 32 that are connected to each other. The fixing portion 31 includes an installation surface 31a and an upper surface 31b facing the installation surface 31a. The support portion 32 includes a support surface 32a. The upper surface 31b connects to the support surface 32a on the surface of the seal material support 30 at the connection portion 36 without penetrating the seal material support 30. That is, the upper surface 31b is continuous with the support surface 32a at the connecting portion 36. On the other hand, the installation surface 31a is separated from the support surface 32a on the surface of the sealant support 30 at the connection portion 36, and is not connected to the support surface 32a unless it penetrates the sealant support 30 at the connection portion 36. The configuration is such that it is not possible. That is, the installation surface 31a is not continuous with the support surface 32a at the connection portion 36.

The support surface 32a, the installation surface 31a, and the upper surface 31b do not necessarily have to be flat surfaces, but in the first embodiment, they are flat surfaces. When the installation surface 31a is extended so that the installation surface 31a and the support surface 32a intersect, the support surface 32a and the extension surface EX are connected to each other on the side where the support surface 32a faces the virtual extension surface EX of the installation surface 31a. The angle θ formed is an acute angle, preferably in the range 10° to 80°, more preferably in the range 20° to 70°, even more preferably in the range 30° to 60°, most preferably 45°.

As shown in FIG. 2, the sealing material support 30 is fixed to the L-shaped steel 24 by welding so that the installation surface 31a of the fixing part 31 faces the upper surface of the L-shaped steel 24. The support portion 32 is located within the outer circumference gap 4, and the support surface 32a is configured to approach the equipment hatch 100 as it goes toward the tip 32b of the support portion 32 within the outer circumference gap 4, that is, to face diagonally upward. There is. The sealing material 5 is provided in the outer circumferential gap 4 so as to be supported by the support surface 32a.

As shown in FIG. 3, the sealing material support 30 preferably has a flat plate-shaped fixing part 31 and a support part 32. With such a configuration, the sealing material support 30 can be formed by bending a flat plate, so that the manufacturing operation of the sealing material support 30 can be simplified and the manufacturing cost can be reduced.

Even if the sealing material support 30 has a flat plate-shaped fixing part 31 and a support part 32, it is not limited to being formed by bending a flat plate. It is also possible to form the sealing material support body 30 by connecting the fixing part 31 and the support part 32, each of which has a separate flat plate shape, by welding. In this case, a welded portion 33 is present at the connection portion 36 between the fixed portion 31 and the support portion 32.

As shown in FIG. 5, the sealing material support 30 can also be formed by removing portions 34 and 35 from a rectangular parallelepiped metal body by machining. In this case, the support portion 32 does not necessarily have to have a flat plate shape. 4 and 5, the upper surface 31b and the support surface 32a are continuous at the connecting portion 36 between the fixed part 31 and the support part 32, but the installation surface 31a and the support surface 32a are continuous. It is not connected to, but separate from, that is, it is not continuous.

<Seal structure construction method (sealing method) according to Embodiment 1 of the present disclosure>
A method for constructing the seal structure 10, that is, a sealing method for sealing the outer circumferential gap 4 will be described with reference to FIGS. 1 and 2. The premise is that after removing the sealing material 5 of the sealing structure 10 from the outer circumferential gap 4, a hanging tool (not shown) is engaged with the hanging fitting 110 of the equipment hatch 100 to lift up the equipment hatch 100, thereby opening the penetration part 2. A state exists. Further, it is assumed that the sealing material support 30 has already been fixed to the frame 1. From this state, the equipment hatch 100 is installed inside the penetration part 2. Next, the seal structure 10 is constructed by providing the seal material 5 in the outer peripheral gap 4 so as to be supported by the support surface 32a of the seal material support body 30.

<Operations and effects of the seal material support and seal structure according to Embodiment 1 of the present disclosure>
When water intrudes from above the building frame 1 at a nuclear power plant, if the outer gap 4 is not sealed with the seal structure 10, water will leak through the outer gap 4, through the penetration part 2, and down to the bottom of the structure 1. I end up. However, even if water intrudes from above the frame 1, the water is stopped by the seal structure 10, so water intrusion below the frame 1 can be prevented.

However, since the sealing material 5 such as caulking is a material with high elasticity and ductility, if the water pressure applied to the sealing material 5 is too large, the sealing material 5 may be damaged and water may infiltrate below the frame 1. . However, in the seal structure 10, since the seal material 5 is supported on the support surface 32a of the seal material support 30 fixed to the frame 1, even if water pressure is applied to the seal material 5, the seal material 5 deforms. Since this is suppressed, it is possible to reduce the possibility that the sealing material 5 will be damaged. As a result, the sealing strength of the outer circumferential gap 4 can be improved.

Generally, hatches are removed periodically (once a year), so it is necessary to have a structure that is easy to remove and reapply the sealing material. The gap is a parallel narrow part with space in the depth direction, so if sealant is installed in the narrow part, it will be difficult to remove the sealant when removing the hatch due to poor access to the sealant, making it difficult to reinstall. Workability deteriorates. On the other hand, in the seal structure 10, the outer peripheral gap 4 in which the seal material 5 is applied is accessible, and the seal material 5 can be easily removed when the hatch 3 is removed. In addition, the sealing material support 30 has a wide frontage and an acute angle in the depth direction with respect to the frame 1, and has a flexible structure, so that the hatch 3 can be easily inserted.

<Configuration of modification example of seal structure according to Embodiment 1 of the present disclosure>
In the first embodiment, instead of the plate 26 provided along the inner surface of the upper part 21 of the penetrating part 2, as shown in FIG. The plate 28 may be provided so as to face (including the upper surface of). Although not shown, a plate 26 (see FIG. 2) may be provided along with the plate 28 along the inner surface of the upper portion 21 of the penetrating portion 2.

(Embodiment 2)
Next, a seal structure according to the second embodiment will be explained. In the seal structure according to the second embodiment, the configuration of the hatch 3 is changed from that in the first embodiment. In the second embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed explanation thereof will be omitted. In the following description, unless otherwise specified, Embodiment 1 includes not only the form shown in FIG. 3 but also some modifications of Embodiment 1 shown in FIGS. 4 to 6.

<Configuration of seal material support and seal structure according to Embodiment 2 of the present disclosure>
As shown in FIG. 7, the hatch 3 installed in the penetration part 2 is equipped with two concrete equipment hatches 200, 300, and the seal structure 10 according to the second embodiment of the present disclosure has the equipment hatch 200, 300. , 300 facing each other, and an intermediate gap 6 formed between the outer circumferential surfaces 200a and 300a other than the outer circumferential surfaces 200b and 300b of the equipment hatches 200 and 300, respectively, and the frame 1. The outer peripheral gap 4 is sealed. Hanging fittings 210, 310 for hanging the equipment hatches 200, 300 are provided on the upper surfaces of the equipment hatches 200, 300, respectively.

As shown in FIG. 8, one of the equipment hatches 300 includes a hatch upper part 301 and a hatch lower part which is located below the hatch upper part 301 and has a width smaller than the width of the hatch upper part 301, as in the first embodiment. 302. The upper hatch 301 includes two lower surfaces 303 positioned to sandwich the lower hatch 302 . One of the two lower surfaces 303 is supported by the stepped portion 23. The other equipment hatch 200 includes a hatch upper part 201 and a hatch lower part 202 located below the hatch upper part 201. The lower hatch 202 is configured to protrude further toward the equipment hatch 300 than the outer peripheral surface 200b of the equipment hatch 200. A lower surface 203 of the hatch upper portion 201 is supported by a stepped portion 23 . The other of the two lower surfaces 303 of the hatch upper part 301 of the equipment hatch 300 is supported by the upper surface 202a of the hatch lower part 202 of the equipment hatch 200.

The configuration of the seal structure 10 that seals the outer circumferential gap 4 is the same as in the first embodiment. In the second embodiment, a seal structure 10 for sealing the intermediate gap 6 is also provided. In the seal structure 10 that seals the intermediate gap 6, an L-shaped steel 205 is provided on the hatch upper part 201 of one of the equipment hatches 200 so as to be flush with the upper surface 201a and the outer peripheral surface 200b, and the L-shaped steel 205 is installed on the installation surface 31a of the fixing part 31. The sealing material support 30 is fixed to the L-shaped steel 205 by welding so that it faces the upper surface of the L-shaped steel 205. The support portion 32 is located within the intermediate gap 6, and the support surface 32a is configured to approach the equipment hatch 300 within the intermediate gap 6 toward the tip 32b of the support portion 32, that is, to face diagonally upward. There is. The sealing material 5 is provided in the intermediate gap 6 so as to be supported by the support surface 32a. The seal material support 30 of the seal structure 10 that seals the intermediate gap 6 is an L-shaped steel provided so as to be flush with the upper surface 301a and the outer peripheral surface 300b of the hatch upper part 301 of the other equipment hatch 300. It may be fixed at 305.

<Seal structure construction method (sealing method) according to Embodiment 2 of the present disclosure>
In the method for constructing the seal structure 10 in the second embodiment, the method for constructing the seal structure 10 for sealing the outer circumferential gap 4 is the same as in the first embodiment. The method for constructing the seal structure 10 for sealing the intermediate gap 6 is to install the equipment hatch 200, 300 in the penetration part 2, and then The seal structure 10 is constructed by providing the seal material 5 in the intermediate gap 6 so as to be supported by the support surface 32a of the seal material support 30.

<Operations and effects of the seal material support and seal structure according to Embodiment 2 of the present disclosure>
In the second embodiment, the seal structure 10 that seals each of the outer peripheral gap 4 and the intermediate gap 6 also has a seal structure 10 that seals each of the outer peripheral gap 4 and the intermediate gap 6 by supporting the seal material 5 on the support surface 32a of the seal material support 30, as in the first embodiment. Since deformation of the sealing material 5 is suppressed even if water pressure is applied to the material 5, the possibility that the sealing material 5 will be damaged can be reduced. As a result, the seal strength of the outer circumferential gap 4 and the intermediate gap 6 can be improved.

(Embodiment 3)
Next, a seal structure according to Embodiment 3 will be explained. In the seal structure according to the third embodiment, the configuration of the hatch 3 is changed from that in the first embodiment. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

<Configuration of seal material support and seal structure according to Embodiment 3 of the present disclosure>
As shown in FIG. 9, the hatch 3 installed in the penetration part 2 includes two metal equipment hatches 400, 500 connected to each other, and the seal structure 10 according to the third embodiment of the present disclosure. seals an outer periphery gap 4 formed between the outer periphery of two metal equipment hatches 400, 500 connected to each other and the frame 1. Hanging fittings 410, 510 for hanging the equipment hatches 400, 500 are provided on the upper surfaces of the equipment hatches 400, 500, respectively.

As shown in FIG. 10, one equipment hatch 400 includes a flat plate-shaped top plate portion 403 and two L-shaped steels 401 and 402 fixed to the lower surface of the top plate portion 403. One L-shaped steel 401 is supported by the stepped portion 23. The other equipment hatch 500 includes a flat top plate portion 503 and an L-shaped steel 501 fixed to the lower surface of the top plate portion 503. The L-shaped steel 501 is supported by the stepped portion 23. An intermediate gap 6 is formed between the top plate part 403 and the top plate part 503, and the top plate part 403 is closed by closing this intermediate gap 6 from the bottom side of each of the top plate part 403 and the top plate part 503. The top plate portion 403 and the top plate portion 503 are connected to each other by fixing an L-shaped steel 600 to the lower surface of each of the top plate portions 503 and 503 . A sealing material 5 is provided in the intermediate gap 6 so as to be supported by the L-shaped steel 600.

There is an outer peripheral gap 4 between the outer peripheral edges 403a and 503a of the top plate part 403 and the top plate part 503, other than the outer peripheral edges 403b and 503b of the top plate part 403 and the top plate part 503, respectively, which define the intermediate gap 6, and the frame 1. is formed, and the outer circumferential gap 4 is sealed by a seal structure 10 having the same configuration as in the first embodiment.

<Seal structure construction method (sealing method) according to Embodiment 3 of the present disclosure>
Similarly to Embodiment 1, the method for constructing the seal structure 10 in Embodiment 3 is based on the assumption that the seal material support 30 is already fixed to the frame 1, and after installing the equipment hatches 400, 500 in the penetration part 2. The seal structure 10 is constructed by providing the seal material 5 in the outer peripheral gap 4 so as to be supported by the support surface 32a of the seal material support body 30.

<Operations and effects of the seal material support and seal structure according to Embodiment 3 of the present disclosure>
Similarly to the first embodiment, the seal structure 10 for sealing the outer circumferential gap 4 in the third embodiment has the seal material 5 supported on the support surface 32a of the seal material support 30, so that water pressure is applied to the seal material 5. Since deformation of the sealing material 5 is suppressed even when the sealing material 5 is damaged, the risk of the sealing material 5 being damaged can be reduced. As a result, the sealing strength of the outer circumferential gap 4 can be improved.

As shown in FIG. 11, the equipment hatch 500 (the same applies to the equipment hatch 400) has a configuration in which the outer peripheral edge 503a of the top plate portion 503 protrudes beyond the L-shaped steel 501. The tip 32b of the support portion 32 is not limited to the configuration where it is located on the opposite side of the equipment hatch 500 with respect to the outer circumferential edge 503a, but is located below the outer circumferential edge 503a of the top plate portion 503 and with respect to the outer circumferential edge 503a. It may be located on the same side as the equipment hatch 500. According to such a configuration, the gap between the tip 32b of the support part 32 of the sealing material support 30 and the surface 501a of the L-shaped steel 501 of the hatch 500 can be made as small as possible, so that the sealing material by the sealing material support 30 can be made as small as possible. The supporting effect of No. 5 is improved, and the sealing strength can be further improved.

In the equipment hatch 500 that is the hatch 3 (the same applies to the equipment hatch 400), the outer peripheral edge 503a of the top plate part 503 and the surface 501a of the L-shaped steel 501 facing the tip 32b of the support part 32 are the outer peripheral surface 3a of the hatch 3. I can think about it. Therefore, the configuration described with reference to FIG. 11 is not only applicable to metal equipment hatches 400 and 500. As shown in FIG. 12, a top plate part 104 is provided on the upper surface of the hatch upper part 101 of the concrete equipment hatch 100 of the first embodiment, and the outer peripheral edge 104a of the top plate part 104 is lower than the outer peripheral surface 101a of the hatch upper part 101. If the structure also protrudes, the tip 32b of the support part 32 of the sealing material support 30 is located below the outer peripheral edge 104a of the top plate part 104 and on the same side as the hatch upper part 101 with respect to the outer peripheral edge 104a. Good too.

In the first to third embodiments, the seal material support 30 of the seal structure 10 that seals the outer circumferential gap 4 is fixed to the frame 1, but it may be fixed to the hatch 3 installed in the penetrating part 2. In the former configuration, since the seal material support 30 is fixed to the frame 1 in advance, the work of attaching the seal material support 30 is not necessary when opening and closing the hatch 3, and work efficiency can be improved. . On the other hand, in the latter configuration, even when the hatch 3 is installed in the frame 1 to which the sealing material support 30 is not fixed, the sealing strength of the outer circumferential gap 4 can be improved.

In the second embodiment, the hatch 3 was equipped with two concrete equipment hatches 200, 300, and in the third embodiment, the hatch 3 was equipped with two metal equipment hatches 400, 500. The configuration is not limited to two, and any number of equipment hatches, including three or more, may be provided.

The contents described in each of the above embodiments can be understood as follows, for example.

[1] The sealing material support according to one aspect is:
An outer circumferential gap (4) formed between the outer circumferential surface (3a) of at least one hatch (3) and the skeleton (1) or an intermediate space between adjacent hatches (3, 3) among a plurality of hatches (3) A sealing material support (30) for supporting a sealing material (5) that seals a gap (6),
a fixing part (31) including an installation surface (31a);
a support portion (32) including a support surface (32a) that supports the sealing material (5);
The fixing part (31) and the support part (32) are connected to each other, and the installation surface (31a) and the support surface (32a) are separated from each other at the connection part (36). ) and the support surface (32a) intersect, the support surface (32a) faces the virtual extension surface (EX) of the installation surface (31a). The angle (θ) formed by the support surface (32a) and the extension surface (EX) on the side where the support surface (32a) and the extension surface (EX) extend is an acute angle.

According to the seal material support of the present disclosure, the seal material support supports the seal material provided in the outer peripheral gap formed between the outer peripheral surface of the hatch and the frame, so that even if pressure is applied to the seal material, Since the risk of damage to the sealing material can be reduced, the sealing strength of the outer circumferential gap can be improved.

[2] A sealing material support according to another aspect is the sealing material support of [1], comprising:
The fixing part (31) and the supporting part (32) have a flat plate shape.

According to such a configuration, the sealing material support can be formed by bending a flat plate, so that manufacturing operations for the sealing material support can be simplified and manufacturing costs can be reduced.

[3] A sealing material support according to yet another aspect is the sealing material support of [1] or [2],
The angle (θ) ranges from 10° to 80°.

According to such a configuration, the effect of supporting the sealing material by the sealing material support body is improved, so that the sealing strength can be further improved.

[4] The seal structure according to the first aspect is:
A sealing structure (10) that seals an outer circumferential gap (4) formed between an outer circumferential surface (3a) of at least one hatch (3) and a frame (1),
The sealing material support (30) according to any one of [1] to [3], which is fixed such that the installation surface (31a) faces one of the at least one hatch (3) or the frame (1); ,
a sealing material (5) provided in the outer peripheral gap (4),
The support surface (32a) approaches the at least one hatch (3) or the other of the frame (1) as it goes toward the tip (32b) of the support part (32) within the outer circumferential gap (4). configured,
The sealing material (5) is supported by the sealing material support (30).

According to the seal structure of the present disclosure, the seal material support supports the seal material provided in the outer circumferential gap formed between the outer circumferential surface of the hatch and the frame, so that even if pressure is applied to the seal material, the seal material remains intact. Since the risk of damage can be reduced, the sealing strength of the outer peripheral gap can be improved.

[5] A seal structure according to another aspect is the seal structure of [4],
The sealing material support (30) is fixed to the frame (1).

According to such a configuration, since the sealing material support is fixed to the frame in advance, when opening and closing the hatch, there is no need to attach the sealing material support, and workability can be improved.

[6] A seal structure according to yet another aspect is the seal structure of [5],
The at least one hatch (3) includes a top plate portion (104/503) including an outer peripheral edge (104a/503a) that protrudes from the outer peripheral surface (3a),
The tip (32b) of the support part (32) is located below the outer peripheral edge (104a/503a) of the top plate part (104/503) and closer to the outer peripheral surface (3a).

According to such a configuration, even if the hatch includes a top plate part, the gap between the tip of the support part of the sealing material support and the outer circumferential surface of the hatch can be made as small as possible. The supporting effect of the seal material is improved, and the seal strength can be further improved.

[7] A seal structure according to yet another aspect is the seal structure of [4],
The sealing material support (30) is fixed to the at least one hatch (3).

According to such a configuration, even when the hatch is installed in a frame to which the sealing material support is not fixed, the sealing strength of the outer circumferential gap can be improved.

[8] A seal structure according to yet another aspect is the seal structure according to any one of [4] to [7],
The at least one hatch (3) includes at least two hatches (200, 300), and an intermediate gap (6) is formed between adjacent hatches (200, 300);
The sealing material support (30) is further fixed to one of the adjacent hatches (200),
The support surface (32a) of the seal material support (30) fixed to one of the adjacent hatches (200) is located within the intermediate gap (6), and the seal material (5) is located within the support surface. (32a) in the intermediate gap (6).

According to such a configuration, when a plurality of hatches are installed, the sealing strength of the intermediate gap formed between adjacent hatches can also be improved.

[9] A seal structure according to yet another aspect is the seal structure according to any one of [4] to [8],
Said at least one hatch (3) is a concrete or metal hatch.

According to such a configuration, it is possible to improve the sealing strength of the outer circumferential gap formed between the outer circumferential surface of each hatch and the frame.

[10] The sealing method according to the first aspect includes:
A sealing method for sealing an outer circumferential gap (4) formed between an outer circumferential surface (3a) of at least one hatch (3) and a frame (1), comprising:
The sealant (5) is attached to the outer periphery so as to be supported by the sealant supports (30) of [1] to [3] fixed to one of the at least one hatch (3) or the frame (1). including the step of providing in the gap (4).

According to the sealing method of the present disclosure, the sealing material support supports the sealing material provided in the outer peripheral gap formed between the outer peripheral surface of the hatch and the frame, so that even if pressure is applied to the sealing material, the sealing material remains intact. Since the risk of damage can be reduced, the sealing strength of the outer peripheral gap can be improved. Further, the outer peripheral gap where the sealing material is applied has an accessible structure, and the sealing material can be easily removed when the hatch is removed. Furthermore, since the sealing material support has a wide opening with respect to the frame and an acute angle in the depth direction, and has a flexible structure, the structure is excellent in ease of hatch insertion.

1 Frame 3 Hatch 3a Outer surface (of the hatch) 4 Outer gap 5 Seal material 6 Intermediate gap 10 Seal structure 20 Opening 30 Seal material support 31 Fixed part 31a Installation surface 32 Support part 32a Support surface 32b Tip (of support part) 36 Connection part 100 Equipment hatch 104 Top plate part 104a (of the top plate part) outer periphery 200 Equipment hatch 300 equipment hatch 400 equipment hatch 500 equipment hatch 503 Top plate part 503a (of the top plate part) outer periphery EX (of the installation surface) Extension surface θ angle

Claims (10)

A sealing material support for supporting a sealing material that seals an outer peripheral gap formed between the outer peripheral surface of at least one hatch and a skeleton or an intermediate gap between adjacent hatches among a plurality of hatches,
A fixed part including the installation surface,
a support portion including a support surface that supports the sealing material;
The fixing part and the support part are connected to each other, the installation surface and the support surface are separated from each other at the connection part, and when the installation surface is extended so that the installation surface and the support surface intersect. In the sealing material support, the angle formed by the support surface and the extension surface on the side where the support surface faces the virtual extension surface of the installation surface is an acute angle. The seal material support according to claim 1, wherein the fixing part and the support part have a flat plate shape. The sealing material support according to claim 1 or 2, wherein the angle is in a range of 10° to 80°. A sealing structure that seals an outer circumferential gap formed between an outer circumferential surface of at least one hatch and a skeleton,
The sealing material support according to any one of claims 1 to 3, which is fixed such that the installation surface faces one of the at least one hatch or the frame;
and a sealing material provided in the outer peripheral gap,
The support surface is configured to approach the other of the at least one hatch or the frame as it approaches the tip of the support part within the outer circumferential gap,
A seal structure in which the sealing material is supported by the sealing material support. The seal structure according to claim 4, wherein the seal material support is fixed to the frame. The at least one hatch includes a top plate portion including an outer peripheral edge protruding from the outer peripheral surface,
The seal structure according to claim 5, wherein the tip of the support portion is located below the outer peripheral edge of the top plate portion and closer to the outer peripheral surface. 5. A seal structure according to claim 4, wherein the sealant support is fixed to the at least one hatch. the at least one hatch includes at least two hatches, and an intermediate gap is formed between adjacent hatches;
The sealing material support is further fixed to one of the adjacent hatches,
The support surface of the seal material support fixed to one of the adjacent hatches is located within the intermediate gap, and the seal material is provided in the intermediate gap so as to be supported by the support surface. The seal structure according to any one of claims 4 to 7. The seal structure according to any one of claims 4 to 8, wherein the at least one hatch is a concrete or metal hatch. A sealing method for sealing an outer circumferential gap formed between an outer circumferential surface of at least one hatch and a skeleton, the method comprising:
A seal comprising the step of providing a sealing material in the outer peripheral gap so as to be supported by the sealing material support according to any one of claims 1 to 3, which is fixed to one of the at least one hatch or the frame. Method.

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