Airtight sheet hole reconstruction device

Abstract

To effectively suppress the deterioration of the airtightness of the airtight sheet. [Solution] The above problem can be solved by providing a fixing means for detachably fixing the first elastic ring 10 and the second elastic ring 20, wherein the first elastic ring 10 has a first contact surface 11 that is continuous in the annular direction and provided on one side in the thickness direction, and a second protruding portion 12 that is continuous in the annular direction and protrudes radially toward the center of the first contact surface 11 so as to form the innermost peripheral edge of the first elastic ring 10, and the second elastic ring 20 has a second contact surface 21 that is continuous in the annular direction and provided on one side in the thickness direction, and the protruding portion 12 protrudes radially toward the center of the innermost peripheral edge of the second elastic ring 20, and the peripheral edge of the opening of the airtight sheet 8 is airtightly sandwiched between the first contact surface 11 and the second contact surface 21 in the circumferential direction.

Description

Technical Field

[0001] The present invention relates to a hole reconstruction device attached to a hole in an airtight sheet.

Background Art

[0002] In the wall of a highly airtight and highly heat-insulating building, a heat-insulating material is disposed between an outer wall material such as siding and an inner wall material such as a gypsum board, and an airtight sheet is disposed between the heat-insulating material and the inner wall material. By this airtight sheet, airtightness between the interior and the outside of the airtight sheet in the wall is ensured. When pipes and wiring are drawn from the outside to the inside of the building for electrical, plumbing, gas, communication, air-conditioning and ventilation work, etc., after forming a hole that penetrates all the wall structural members including the airtight sheet in the thickness direction, it is required to install a sleeve for pipes or wiring and ensure the airtightness of the gap between the outer peripheral surface of the sleeve and the hole in the airtight sheet (hereinafter, simply referred to as ensuring the airtightness of the airtight sheet).

[0003] When constructing a new building, before attaching the inner wall material, with the entire airtight sheet exposed, after forming a hole that penetrates in the thickness direction in the airtight sheet, in order to seal the gap between the hole in the airtight sheet and the sleeve using an airtight tape or the like, it is possible to ensure the airtightness by the airtight sheet. However, after attaching the inner wall material or after the building is completed, the same operation is impossible.

[0004] In response to such a problem, a large-diameter ring having a large-diameter cylindrical portion with an outer diameter substantially equal to the diameter of the hole in the inner wall material, a flange with a diameter larger than the diameter of the hole in the inner wall material formed at the indoor-side end of the large-diameter cylindrical portion, and an axially continuous cutting portion formed in the large-diameter cylindrical portion and the flange portion, a small-diameter cylindrical portion fitted into the large-diameter ring, a flange with a diameter larger than the diameter of the hole in the inner wall material formed at the end of the small-diameter cylindrical portion on the inner side of the wall, and a small-diameter ring having an axially continuous cutting portion formed in the small-diameter cylindrical portion and the flange portion. A hole cap has been proposed that is configured to sandwich the peripheral edge of the hole in the airtight sheet between the flange of the small-diameter ring and the outer surface of the peripheral edge of the hole in the inner wall material (see, for example, Patent Documents 1 and 2).

[0005] However, these conventional hole caps require a cut to position the flange of the small-diameter ring on the outer side of the inner wall material. This cut allows the outside of the airtight sheet inside the wall to connect with the interior, making them insufficient in terms of ensuring airtightness. Furthermore, the possibility of gaps forming between the flange of the small-diameter ring and the airtight sheet depending on the condition of the outer and inner surfaces of the inner wall material also posed a problem from the standpoint of ensuring airtightness. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2006-225847 [Patent Document 2] Japanese Patent Application Publication No. 2-308006 [Overview of the project] [Problems that the invention aims to solve]

[0007] Therefore, the main objective of the present invention is to provide an airtight sheet hole reconstruction device that can be easily installed after the interior wall material has been installed or after the building has been completed, and that can effectively suppress the deterioration of the airtightness of the airtight sheet. [Means for solving the problem]

[0008] The device for reconstructing holes in an airtight sheet that solves the above problems is as follows. <First aspect> A hole reconstruction device that is attached to an opening in an airtight sheet, It has a first elastic ring that is continuous in an annular shape and a second elastic ring that is continuous in an annular shape, The first elastic ring has a first contact surface that is continuous in an annular shape and provided on one side in the thickness direction, and a second protruding portion that extends radially towards the center from the first contact surface so as to form the innermost peripheral edge of the first elastic ring. The second elastic ring has a second contact surface that is continuous in an annular shape and is provided on one side in the thickness direction. The aforementioned protruding portion extends radially towards the center beyond the innermost peripheral edge of the second elastic ring. The peripheral edge of the opening in the airtight sheet is airtightly sandwiched between the first contact surface and the second contact surface in a continuous circumferential manner, and the first elastic ring and the second elastic ring are provided with fixing means for detachably fixing them to each other. A device for reconstructing holes in an airtight sheet, characterized by the above.

[0009] (Effects and Benefits) In this airtight sheet hole reconstruction device, the peripheral edge of the opening in the airtight sheet is sandwiched between the first contact surface of the first elastic ring and the second contact surface of the second elastic ring (between the elastic bodies), thereby ensuring continuous airtightness in the circumferential direction, while the annularly continuous protruding portion of the first elastic ring can form a sleeve insertion hole of a predetermined size and shape. Since the edge of the sleeve insertion hole is also an elastic body, by inserting the sleeve into the first elastic ring, the inner peripheral edge of the protruding portion can be airtightly adhered to the sleeve, and as a result, the deterioration of the airtightness of the airtight sheet can be suppressed. In other words, an opening pre-formed in the airtight sheet can be reconstructed as a hole with a smaller diameter that fits the sleeve by attaching the first and second elastic rings. Furthermore, since the first and second elastic rings are made of elastic material, they can be deformed and restored to pass through openings in the interior wall material and the airtight sheet without having to provide cut sections that impair airtightness, as described in Patent Documents 1 and 2. Therefore, installation can be easily performed from the interior side only, even after the interior wall material has been installed or after the building has been completed (of course, it can also be installed before the interior wall material has been installed). Note that the maximum diameter refers to the largest diameter of the circumscribed circle that circumscribes the closed curve (open hole, outer edge, inner edge) of the object, while the minimum diameter refers to the diameter of the inscribed circle that circumscribes the closed curve of the object and shares the same center as the circumscribed circle that circumscribes the closed curve of the object. These are equal to the diameter if the closed curve of the object is a perfect circle.

[0010] <Second aspect> The first elastic ring is positioned adjacent to the outdoor side of the airtight sheet. The second elastic ring is positioned adjacent to the interior side of the airtight sheet. The maximum diameter of the outermost edge of the first elastic ring and the maximum diameter of the outer edge of the first contact surface are smaller than the minimum diameter of the outer edge of the second contact surface. A device for reconstructing holes in an airtight sheet according to a first embodiment.

[0011] (Effects and Benefits) When the first and second elastic rings have the relative sizes described in this embodiment, the first and second elastic rings can be simultaneously seen when working by looking into the opening in the interior wall material from the interior side, thus improving work efficiency when performing installation solely from the interior side. Furthermore, by reaching a hand through the first elastic ring to the exterior side and tracing the outer edge of the outermost edge of the first elastic ring with a finger, it becomes easy to confirm whether the peripheral edge of the airtight sheet is continuously sandwiched between the first and second contact surfaces in the circumferential direction.

[0012] <Third aspect> The first elastic ring has a first wall portion located on the indoor side and continuous in an annular shape, and a first cylindrical portion extending from the first wall portion to the outdoor side, the first contact surface is the indoor side surface of the first wall portion, and the protruding portion is the portion that protrudes radially towards the center from the first cylindrical portion. The second elastic ring has a second cylindrical portion that is inserted through the opening in the airtight sheet and the radially central side of the first wall portion, and a second wall portion that extends radially outward from the second cylindrical portion and is continuous in an annular shape. The peripheral edge of the airtight sheet and the first wall are airtightly sandwiched between the second contact surface and the indoor side surface of the second wall. A second embodiment of a hole reconstruction device for an airtight sheet.

[0013] (Effects and Benefits) The fixing means for detachably fixing the first elastic ring and the second elastic ring to each other is not particularly limited. However, if configured as in this embodiment, without separately preparing fixing means, the fixing means can be constituted only by the first elastic ring and the second elastic ring, reducing the number of parts and improving workability thereby, which is preferable. Particularly, in the case of this embodiment, after inserting the second elastic ring through the opening of the inner wall member, facing the second contact surface to the indoor side surface of the peripheral portion of the airtight sheet, inserting the second cylindrical portion through the opening of the airtight sheet, the first elastic ring is disposed adjacent to the outdoor side of the airtight sheet through the inside of the second elastic ring. Then, by inserting a finger through the inside of the second elastic ring and pushing the first wall portion of the first elastic ring between the airtight sheet and the second wall portion, the peripheral portion of the airtight sheet and the first wall portion can be hermetically sandwiched between the second contact surface and the indoor side surface of the second wall portion.

[0014] <Fourth Aspect> The first elastic ring has a first fitting portion provided on the indoor side surface of the protruding portion. The second elastic ring has a second fitting portion provided at a portion facing the first fitting portion. By fitting the first fitting portion to the second fitting portion, the first contact surface is configured to be pressed toward the second contact surface side through the peripheral portion of the airtight sheet. The hole reconstruction device for the airtight sheet of the second aspect.

[0015] (Function and Effect) The fixing means for detachably fixing the first elastic ring and the second elastic ring to each other is not particularly limited. However, if configured as in this embodiment, without separately preparing fixing means, the fixing means can be constituted only by the first elastic ring and the second elastic ring, reducing the number of parts and improving workability thereby, which is preferable. Particularly, in the case of this aspect, the second elastic ring is inserted through the opening of the inner wall material, the second contact surface is opposed to the indoor side surface of the peripheral edge of the airtight sheet, and after the second cylindrical portion is inserted into the opening of the airtight sheet, the first elastic ring is disposed adjacent to the outdoor side of the airtight sheet through the inside of the second elastic ring. Then, by fitting the first fitting portion and the second fitting portion together, the peripheral edge portion of the airtight sheet can be hermetically sandwiched between the first contact surface and the second contact surface.

[0016] <The fifth aspect> The second elastic ring has a support portion for fixing the second elastic ring to the inner wall material. The hole reconstruction device for the airtight sheet according to the third or fourth aspect.

[0017] (Function and effect) Since the first elastic ring and the second elastic ring are separate members, they are arranged on the outdoor side and the indoor side of the airtight sheet on the back side of the inner wall material. When performing the fixing work, the second elastic ring can be supported by the inner wall material, so that subsequent work, such as positioning the airtight sheet and attaching the first elastic ring, can be concentrated, and the construction work becomes easier. This aspect enables this by providing a holding portion for the inner wall material on the second elastic ring.

[0018] <The sixth aspect> The first elastic ring has a first fitting portion provided on the indoor side surface of the overhanging portion. A third inner wall portion disposed adjacent to the indoor side of the second elastic ring, a third cylindrical portion extending from the third inner wall portion to the outdoor side through the opening of the airtight sheet and the radial center side of the first wall portion, and a third ring having a third outer wall portion that projects radially outward from the third cylindrical portion. The overhanging portion projects radially inward from the innermost peripheral edge of the second elastic ring and the innermost peripheral edge of the third ring. Between the outdoor side surface of the third inner wall portion and the indoor side surface of the third outer wall portion, a portion having the second contact surface in the second elastic ring, the peripheral edge portion of the airtight sheet, and the first wall portion are configured to be hermetically sandwiched. The hole reconstruction device for the airtight sheet according to the second aspect.

[0019] (Effects and Benefits) The fastening means for detachably securing the first and second elastic rings together is not particularly limited, but a third ring that functions as a fastening means similar to that in the third embodiment may also be provided. In this case, the material of the third ring can be made suitable for securing the first and second elastic rings together.

[0020] <Seventh aspect> The first elastic ring has a first wall portion located on the indoor side and continuous in an annular shape, and a first cylindrical portion extending from the first wall portion to the outdoor side, the first contact surface is the indoor side surface of the first wall portion, the protruding portion is a portion that protrudes radially towards the center from the first cylindrical portion, and the protruding portion has a first fitting portion. The third ring is positioned adjacent to the indoor side of the second elastic ring and has a third wall portion that extends radially towards the center beyond the innermost peripheral edge of the second elastic ring, and a third fitting portion provided on the outdoor side surface of the third wall portion. The aforementioned protruding portion extends radially towards the center beyond the innermost peripheral edge of the second elastic ring and the innermost peripheral edge of the third ring. The first fitting portion is fitted into the third fitting portion, so that the first contact surface is pressed against the second contact surface side via the peripheral edge of the airtight sheet. A second embodiment of a hole reconstruction device for an airtight sheet.

[0021] (Effects and Benefits) The fastening means for detachably securing the first and second elastic rings together is not particularly limited, but a third ring that functions as a fastening means similar to that of the fourth embodiment may also be provided. In this case, the material of the third ring can be made suitable for securing the first and second elastic rings together.

[0022] <Eighth aspect> The third ring has a support portion for fixing the third ring to the inner wall material and a holding portion for holding the second elastic ring. A hole reconstruction device for an airtight sheet according to the sixth or seventh embodiment.

[0023] (Effects and Benefits) Since the first elastic ring, second elastic ring, and third ring are separate components, when they are positioned on the back side of the interior wall material, on the exterior and interior sides of the airtight sheet, and when fixing them in place, if the second elastic ring and the third elastic ring can be supported by the interior wall material, the subsequent work, such as positioning the airtight sheet and attaching the first elastic ring, can be concentrated on, thus simplifying the construction work. In this embodiment, the third ring can be fixed to the interior wall material, and the second elastic ring is held by the third ring, making it easier to position the airtight sheet and attach the first elastic ring.

[0024] <Ninth aspect> Having an elastic cover which is fitted in place of the first elastic ring, The elastic cover has a fourth contact surface that is continuous in an annular shape and provided on one side in the thickness direction, and a closing portion that covers the entire area radially towards the center of the fourth contact surface. Either the elastic cover or the second elastic ring is positioned adjacent to the outdoor side of the airtight sheet, and the other is positioned adjacent to the indoor side of the airtight sheet, and the peripheral edge of the opening in the airtight sheet is airtightly sandwiched between the fourth contact surface and the second contact surface in a continuous circumferential direction, and the elastic cover and the second elastic ring are provided with fixing means for detachably fixing them to each other. A hole reconstruction device for an airtight sheet according to any one of the first to eight embodiments.

[0025] (Effects and Benefits) It is preferable to provide an elastic cover as in this embodiment to ensure airtightness of the holes remaining in the wall after the removal of piping and wiring, or to prepare holes in the wall in advance for future piping and wiring. By installing an elastic cover instead of the first elastic ring, airtightness can be ensured in the same way as when the first elastic ring is used. [Effects of the Invention]

[0026] According to the present invention, the system can be easily installed after the interior wall material has been installed or after the building has been completed, and the deterioration of the airtightness of the airtight sheet can be effectively suppressed. [Brief explanation of the drawing]

[0027] [Figure 1] This is a cross-sectional view showing a wall to which hole reconstruction equipment, etc., has been installed. [Figure 2] This is a cross-sectional view showing the main part of the wall to which the hole reconstruction device and other equipment are installed. [Figure 3] (a) A perspective view from the indoor side, (b) A perspective view from the outdoor side, and (c) A cross-sectional view of the annular continuous portion showing the first elastic ring. [Figure 4] (a) A perspective view from the indoor side, (b) A perspective view from the outdoor side, and (c) A cross-sectional view of the annular continuous portion showing the second elastic ring. [Figure 5] This is a cross-sectional view showing the main part of the wall to which the hole reconstruction device and other equipment are installed. [Figure 6] (a) A perspective view from the indoor side, (b) A perspective view from the outdoor side, and (c) A cross-sectional view of the annular continuous portion showing the first elastic ring. [Figure 7] (a) A perspective view from the indoor side, (b) A perspective view from the outdoor side, and (c) A cross-sectional view of the annular continuous portion showing the second elastic ring. [Figure 8] This is a cross-sectional view showing the main part of the wall to which the hole reconstruction device and other equipment are installed. [Figure 9] (a) A perspective view from the indoor side, (b) A perspective view from the outdoor side, and (c) A cross-sectional view of the annular continuous portion showing the second elastic ring. [Figure 10] The images show (a) an oblique view from the indoor side, (b) an oblique view from the outdoor side, and (c) a cross-sectional view of the annular continuous portion, all illustrating the third ring. [Figure 11] This is a cross-sectional view showing the main part of the wall to which the hole reconstruction device and other equipment are installed. [Figure 12] The images show (a) an oblique view from the indoor side, (b) an oblique view from the outdoor side, and (c) a cross-sectional view of the annular continuous portion, all illustrating the third ring. [Figure 13] This is a cross-sectional view showing the main part of the wall to which the hole reconstruction device and other equipment are installed. [Figure 14] This is a cross-sectional view showing the main part of the wall to which the hole reconstruction device and other equipment are installed. [Figure 15] This is a cross-sectional view showing the main part of a wall to which an elastic cover or the like has been attached. [Figure 16] (a) A perspective view of the elastic cover as seen from the inside, and (b) A perspective view as seen from the outside. [Modes for carrying out the invention]

[0028] The following describes one embodiment of the present invention in detail with reference to the attached drawings. <Examples of target wall structures> Figure 1 shows an example of a wall W in a highly airtight and highly insulated building. Specifically, between the exterior wall material 2 and the interior wall material 3, in order from the exterior wall material 2 side, there is a ventilation layer 4 (space), a breathable waterproof sheet 5, a structural face material 6 made of plywood or the like, insulation material 7 such as glass wool, and an airtight sheet 8. Figure 1 is an example of an interior insulation structure, but the exterior insulation structure is almost the same. After the interior wall material 3 is installed or after the building is completed, when pipes and wiring are brought from the outside E to the inside R for electrical, water, gas, telecommunications, air conditioning and ventilation work, a hole is made using a hole saw or the like that penetrates all the wall components, including the airtight sheet 8, in the thickness direction TD, and then a sleeve 9 for pipes or wiring is installed. Decorative caps 9C can be attached to both ends of the sleeve 9 to hide the edges of the openings in the interior wall material 3 and the exterior wall material 2. A sleeve 9 with a decorative cap integrated into one end can also be used. Depending on the method used to create the opening, the opening in the airtight sheet 8 is usually not perfectly circular, and the edges of the opening are polygonal or jagged. For example, when installing a sleeve 9 for air conditioner piping and wiring, the diameter of the opening 3h in the inner wall material 3 is about 65 to 100 mm, and the maximum diameter of the opening in the airtight sheet 8 is often about the same as the diameter of the opening 3h in the inner wall material 3, also about 65 to 100 mm. The airtight sheet 8 hole reconstruction device 1 described below is installed in the opening of the airtight sheet 8 prior to the installation of the sleeve 9 for piping or wiring, thereby reconstructing a hole that is in close contact with the outer surface of the sleeve 9.

[0029] <Example 1> Figures 1-4 show a first example of a hole reconstruction device 1. This hole reconstruction device 1 has an annularly continuous first elastic ring 10 and an annularly continuous second elastic ring 20. In the first example, the first elastic ring 10 has an annularly continuous first contact surface 11 provided on one side of its thickness direction TD (which is the indoor side in the illustrated example), and an annularly continuous protruding portion 12 that is continuous with the first contact surface 11 and extends radially DD toward the center of the first contact surface 11 so as to form the innermost peripheral edge 10i of the first elastic ring 10.

[0030] Furthermore, the second elastic ring 20 in the first example has a second contact surface 21 that is continuous in an annular shape and is provided on one side of its thickness direction TD (which is the outside in the illustrated example), and the protruding portion extends radially toward the center DD beyond the innermost peripheral edge 20i of the second elastic ring.

[0031] In the illustrated example, the first elastic ring 10 is positioned adjacent to the outdoor E side of the airtight sheet 8, and the second elastic ring 20 is positioned adjacent to the indoor R side of the airtight sheet 8. The peripheral edge 8e of the opening in the airtight sheet 8 is airtightly sandwiched between the first contact surface 11 and the second contact surface 21 in a continuous circumferential direction, and the first elastic ring 10 and the second elastic ring 20 are detachably fixed to each other. In the first example, as will be described later, the second elastic ring 20 has second support parts 24, 25 that are fixed to the inner wall material 3, so the second elastic ring 20 is positioned on the indoor R side of the airtight sheet 8. However, in some cases, such as when there are no such second support parts 24, 25, the second elastic ring 20 may be positioned adjacent to the outdoor E side of the airtight sheet 8, and the first elastic ring 10 may be positioned adjacent to the indoor R side of the airtight sheet 8.

[0032] Therefore, in this hole reconstruction device 1, by sandwiching the peripheral edge 8e of the opening in the airtight sheet 8 between the first contact surface 11 of the first elastic ring 10 and the second contact surface 21 of the second elastic ring 20 (between elastic bodies), continuous airtightness in the circumferential direction is reliably ensured, and a sleeve insertion hole of a predetermined size and shape can be formed by the innermost peripheral edge 10i of the first elastic ring 10, that is, the inner peripheral edge of the annularly continuous protruding portion 12. Since the edge of the sleeve insertion hole is also an elastic body, by inserting the sleeve 9 into the first elastic ring 10, the inner peripheral edge of the protruding portion 12 can be airtightly adhered to the sleeve 9, and as a result, a decrease in the airtightness of the airtight sheet 8 can be suppressed. In other words, by attaching the first elastic ring 10 and the second elastic ring 20 to the opening that was previously formed in the airtight sheet 8, a hole with a smaller diameter that fits the sleeve 9 can be reconstructed. Furthermore, since the first elastic ring 10 and the second elastic ring 20 are made of an elastic material, they can be deformed and restored to pass through the openings in the interior wall material 3 and the airtight sheet 8 without having to provide cut sections that impair airtightness, as described in Patent Documents 1 and 2. Therefore, installation can be easily performed by working only from the interior side, even after the interior wall material 3 has been installed or after the building has been completed (of course, it can also be installed before the interior wall material 3 has been installed).

[0033] The innermost periphery 10i of the first elastic ring 10, the outermost periphery 10e of the first elastic ring 10, the outermost periphery 11e of the first contact surface 11, the inner periphery 11i of the first contact surface 11, the innermost periphery 20i of the second elastic ring 20, the outermost periphery 20e of the second elastic ring 20, the outermost periphery 21e of the second contact surface 21, and the inner periphery 21i of the second contact surface 21 are preferably perfect circles, but one or more of them, or all of them, can be of an appropriate shape such as an oval, ellipse, polygon, or cloud shape.

[0034] The first contact surface 11 has an outer peripheral edge 11e having a minimum diameter larger than the maximum diameter of the opening in the airtight sheet 8, and an inner peripheral edge 11i having a maximum diameter smaller than the minimum diameter of the outer peripheral edge 11e. The second contact surface 21 has an outer peripheral edge 21e having a minimum diameter larger than the maximum diameter of the opening in the airtight sheet 8, and an inner peripheral edge 21i having a maximum diameter smaller than the minimum diameter of the first outer peripheral edge 11e. The minimum diameters of the outer peripheral edge 11e of the first contact surface 11 and the outer peripheral edge 21e of the second contact surface 21 are not particularly limited as long as they are larger than the maximum diameter of the opening in the airtight sheet 8, but it is preferable that they are about 10 to 50 mm larger than the maximum diameter of the opening in the airtight sheet 8. The maximum diameters of the inner periphery 11i of the first contact surface 11 and the inner periphery 21i of the second contact surface 21 are not particularly limited as long as they are smaller than the minimum diameter of the outer periphery 11e of the first contact surface 11. However, in order to improve the reliability of airtightness provided by the first contact surface 11 and the second contact surface 21, it is preferable that they be about 10 to 50 mm smaller than the minimum diameter of the outer periphery 11e of the first contact surface 11.

[0035] Furthermore, the relative diameters of the outer peripheral edge 11e of the first contact surface 11 and the outer peripheral edge 21e of the second contact surface 21, and the relative diameters of the inner peripheral edge 11i of the first contact surface 11 and the inner peripheral edge 21i of the second contact surface 21 can be determined as appropriate. However, as shown in the illustrated example, it is preferable that the maximum diameter of the outermost peripheral edge 10e of the first elastic ring 10 and the maximum diameter of the first peripheral edge 11e are smaller than the minimum diameter of the outer peripheral edge 21e of the second contact surface 21, because this makes it easy to check whether the peripheral edge 8e of the airtight sheet 8 is continuously sandwiched between the first contact surface 11 and the second contact surface 21 in the circumferential direction by reaching a hand through the first elastic ring 10 to the outside E side and tracing the outside of the outermost peripheral edge 10e of the first elastic ring 10 with a finger. Furthermore, in order to securely sandwich the airtight sheet 8, it is preferable that the minimum diameter of the inner peripheral edge 11i of the first contact surface 11 is greater than or equal to the maximum diameter of the inner peripheral edge 21i of the second contact surface 21.

[0036] The innermost peripheral edge 10i of the first elastic ring 10, that is, the inner peripheral edge of the protruding portion 12, forms the edge of the sleeve insertion hole. Therefore, it is preferable to make it shaped to conform to the outer circumference of the cross-section of the sleeve 9 so that it is in close contact with the outer surface of the sleeve 9. Since a normal sleeve 9 is cylindrical, it is preferable to make the inner peripheral edge of the protruding portion 12 a perfect circle. However, when the cylindrical sleeve 9 is inclined, it can also be made elliptical, following the outer circumference of its vertical cross-section. However, since the protruding portion 12 is elastically deformable, it is possible to make the inner peripheral edge of the protruding portion 12 conform to the outer surface of the inclined cylindrical sleeve 9 to a certain extent, even if it is a perfect circle. The diameter of the inner peripheral edge of the protruding portion 12 can be appropriately determined by the outer diameter of the sleeve 9, but it is usually around 60 to 95 mm.

[0037] The first elastic ring 10 and the second elastic ring 20 can be formed using any elastomer, as long as they are deformable and resilient to pass through the openings in the inner wall material 3 and the airtight sheet 8, and are airtight. That is, the elastomer used for the first elastic ring 10 and the second elastic ring 20 may be a thermosetting elastomer such as natural rubber or synthetic rubber (diene rubber, nitrile rubber, chloroprene rubber, butyl rubber, isoprene rubber, urethane rubber, silicone rubber, fluororubber, etc.), or a thermoplastic elastomer such as styrene-based, olefin-based, PVC-based, urethane-based, ester-based, or amide-based elastomer. The materials of the first elastic ring 10 and the second elastic ring 20 may be the same or different. Furthermore, while it is preferable to integrally mold the first elastic ring 10 and the second elastic ring 20 to ensure airtightness, they may also be formed separately and then airtightly connected to form a single unit.

[0038] The hardness of the elastomer can be determined as appropriate; for example, an elastomer with a Shore A hardness (JIS K 6253) of A10 to A90 can be used. The upper limit of the Shore A hardness of the elastomer is preferably A80, more preferably A70, and particularly preferably A65. The lower limit of the Shore A hardness of the elastomer is preferably A30, more preferably A35, and particularly preferably A45.

[0039] The wall thickness of each part of the first elastic ring 10 and the second elastic ring 20 can be determined as appropriate, but for example, the wall thickness of the part having the first contact surface 11 and the wall thickness of the part having the second contact surface 21 can be about 0.5 to 5 mm, and the wall thickness of the other parts can be about 0.5 to 3 mm.

[0040] In the illustrated example, only one pair of the first contact surface 11 and the second contact surface 21 is provided, but multiple pairs of the first contact surface 11 and the second contact surface 21 may be provided with a gap in the radial direction DD.

[0041] The fixing means is not particularly limited as long as the first elastic ring 10 and the second elastic ring 20 can be detachably fixed to each other while the peripheral edge 8e of the opening in the airtight sheet 8 is airtightly sandwiched between the first contact surface 11 and the second contact surface 21 in a continuous circumferential direction. However, in this first example, a structure is adopted in which the portion of the first elastic ring 10 having the first contact surface 11 and the peripheral edge of the airtight sheet 8 are sandwiched between the portion of the second elastic ring 20 having the second contact surface 21 and the portion of the second elastic ring 20 facing the second contact surface 21.

[0042] More specifically, the first elastic ring 10 of the first example has a first wall portion 13 located on the indoor R side and continuous in an annular shape, and a first cylindrical portion 14 extending from the first wall portion 13 to the outdoor E side. The first contact surface 11 is the indoor R side surface of the first wall portion 13, and the protruding portion 12 is the portion that protrudes from the first cylindrical portion 14 toward the center in the radial direction DD. The second elastic ring 20 has a second cylindrical portion 22 inserted through the opening of the airtight sheet 8 and toward the center in the radial direction DD of the first wall portion 13, and a second wall portion 23 that protrudes outward from the second cylindrical portion 22 in the radial direction DD and is continuous in an annular shape. Then, the second elastic ring 20 is inserted through the opening in the inner wall material 3, the second contact surface 21 is positioned facing the indoor R side of the peripheral edge 8e of the airtight sheet 8, the second cylindrical portion 22 is inserted through the opening in the airtight sheet 8, and the second wall portion 23 is positioned facing the outdoor E side of the peripheral edge 8e of the airtight sheet 8. After that, the first elastic ring 10 is positioned adjacent to the outdoor E side of the airtight sheet 8 through the second elastic ring 20, and then, by inserting a finger through the second elastic ring 20 and pushing the first wall portion 13 of the first elastic ring 10 between the airtight sheet 8 and the second wall portion 23, the peripheral edge 8e of the airtight sheet 8 and the first wall portion 13 can be airtightly sandwiched between the second contact surface 21 and the indoor R side surface of the second wall portion 23. In this first example, the fixing means can be constructed using only the first elastic ring 10 and the second elastic ring 20 without the need for separate fixing means, which is preferable because it reduces the number of parts and improves workability, as well as making the fixing process easier.

[0043] As long as the peripheral edge 8e of the airtight sheet 8 and the first wall portion 13 can be airtightly sandwiched between the second contact surface 21 and the second wall portion 23, the orientation of the interior R side surface of the second wall portion 23 is not particularly limited and may, for example, be aligned vertically. However, as shown in the illustrated example, it is preferable that the interior side surface of the second wall portion 23 is inclined so as to move towards the interior R side as it moves outward in the radial direction DD, and the exterior side surface of the first wall portion 13 is aligned with the interior R side surface of the second wall portion 23 (or, although not shown, the tip side of the second wall portion 23 is embedded in the first wall portion 13), because the first wall portion 13 catches on the second wall portion 23 and is less likely to slip out from between the second contact surface 21 and the second wall portion 23.

[0044] In this first example, it is preferable that the second elastic ring 20 has second support portions 24 and 25 that fix itself to the inner wall material 3. Since the first elastic ring 10 and the second elastic ring 20 are separate components, when they are positioned on the back side of the inner wall material 3 on the outdoor E side and indoor R side of the airtight sheet 8 and the fixing work is performed, being able to support the second elastic ring 20 to the inner wall material 3 allows the worker to concentrate on subsequent tasks, such as positioning the airtight sheet 8 and attaching the first elastic ring 10, thus simplifying the construction work. The second support portions 24 and 25 are not particularly limited and may be hook-shaped portions or protrusions that are not continuous in the circumferential direction, but the second support portions 24 and 25 in the illustrated example have a second support cylindrical portion 24 that fits into the opening of the inner wall material 3 with or without play, and a second flange portion 25 provided on the portion of the second support cylindrical portion 24 that protrudes to the indoor R side. The inner wall material 3 is sandwiched between the second flange portion 25 and the portion having the second contact surface 21, and the second support cylinder portion 24 fits into the opening in the inner wall material 3, thereby fixing the second elastic ring 20 to the inner wall material 3. As shown in Figure 13, the second support portions 24 and 25 can be omitted.

[0045] <Example 2> Figures 5 to 7 show a second example of the hole reconstruction device. This second example differs from the first example in the fixing means for detachably fixing the first elastic ring 10 and the second elastic ring 20 to each other. More specifically, the fixing means of this second example consists of a first fitting portion 15 provided on the interior R side surface of the protruding portion 12 of the first elastic ring 10, and a second fitting portion 26 provided on the portion of the second elastic ring 20 facing the first fitting portion 15. When the first fitting portion 15 is fitted into the second fitting portion 26, the first contact surface 11 is pressed against the second contact surface 21 side via the periphery of the airtight sheet 8.

[0046] When using the device, the second elastic ring 20 is inserted through the opening in the inner wall material 3, the second contact surface 21 is positioned opposite the indoor R side surface of the peripheral edge of the airtight sheet 8, and the second cylindrical part 22 is inserted through the opening in the airtight sheet 8. Then, the first elastic ring 10 is positioned adjacent to the outdoor E side of the airtight sheet 8 through the second elastic ring 20, and then the first fitting part 15 and the second fitting part 26 are fitted together to airtightly sandwich the peripheral edge 8e of the airtight sheet 8 between the first contact surface 11 and the second contact surface 21. Similar to the fixing means in the first example, the fixing means of this second example can be constructed using only the first elastic ring 10 and the second elastic ring 20 without the need to prepare a separate fixing means, thereby reducing the number of parts and improving workability.

[0047] The first fitting portion 15 and the second fitting portion 26 are preferably continuous in an annular shape along the circumferential direction of the first elastic ring 10 and the second elastic ring 20, as shown in the illustrated example. However, as long as the airtightness of the first contact surface 11, the airtight sheet 8, and the second contact surface 21 is ensured, they may be provided in multiple locations, particularly four or more, at equal intervals in the circumferential direction of the first elastic ring 10 and the second elastic ring 20, or even in just one location.

[0048] In the illustrated example, the first fitting portion 15 is a recess and the second fitting portion 26 is a convex portion, but the opposite may be used. The shapes of the recess and convex portion can be determined as appropriate, but it is preferable to have larger portions 15b and 26b with dimensions (thickness, diameter, etc.) in a direction perpendicular to the fitting direction on the tip side of the convex portion and on the bottom side of the recess, as shown in the illustrated example, so that the tip of the convex portion fits into the bottom of the recess and becomes difficult to dislodge. In this case, it is preferable to have a projection 15p on the edge of the recess for gripping with a fingertip in order to open the recess and make it easier to dislodge the convex portion, as shown in the illustrated example.

[0049] In the first example, the innermost peripheral edge 20i of the second elastic ring 20 includes the inner peripheral edge of the second support cylinder portion 24. However, in the second example, the second elastic ring 20 has a protruding portion 27 that projects radially toward the center DD from the portion having the second contact surface 21, and the second fitting portion 26 is provided on this protruding portion 27. Furthermore, in the second example, the first elastic ring 10 has an overhang 12 that protrudes radially toward the center DD of the first wall portion 13, and the first fitting portion 15 is provided on the interior R side of this overhang 12.

[0050] The rest is basically the same as in the first example, so I will omit further explanation.

[0051] <Third example> Figures 8 to 10 show a third example of the hole reconstruction device. This third example differs from the first example in that a fixing means for detachably fixing the first elastic ring 10 and the second elastic ring 20 together is provided as a third ring 30. More specifically, in this third example, the first elastic ring 10 is the same as in the first example, but the entire surface of the second elastic ring 20 facing the outdoor E side is the second contact surface 21, and it does not have a second cylindrical portion 22 and a second wall portion 23. Instead, in this third example, there is a third ring 30 having a third inner wall portion 31 positioned adjacent to the indoor R side of the second elastic ring 20, a third cylindrical portion 32 extending from the third inner wall portion 31 to the outdoor E side via the opening in the airtight sheet 8 and the center of the radial DD of the first wall portion 13, and a third outer wall portion 33 projecting outward from the third cylindrical portion 32 in the radial DD direction, the projecting portion 12 protruding towards the center of the radial DD direction more than the innermost peripheral edge 20i of the second elastic ring 20 and the innermost peripheral edge 30i of the third ring 30. The portion of the second elastic ring 20 having the second contact surface 21, the peripheral edge of the airtight sheet 8, and the first wall portion 13 are airtightly sandwiched between the outdoor E side surface of the third inner wall portion 31 and the indoor R side surface of the third outer wall portion 33.

[0052] The third ring 30 may be formed of an elastomer, similar to the first elastic ring 10 and the second elastic ring 20. However, in order to make the fixing of the first elastic ring 10 and the second elastic ring 20 more secure, it may also be formed of a harder material than the first elastic ring 10 and the second elastic ring 20, such as a synthetic resin like a thermoplastic resin. In the latter case, in order to introduce the third ring 30 to the outdoor side E of the inner wall material 3 through the opening in the inner wall material 3, the third ring 30 may be divided into multiple parts in the circumferential direction (the reference numeral 30B in the figure indicates the boundary line of the parts), as shown in the illustrated example, or a cutting portion that is continuous in the axial direction may be provided at one point in the circumferential direction, similar to those described in Patent Documents 1 and 2.

[0053] The third inner wall portion 31 and the third outer wall portion 33 are preferably continuous in an annular shape along the circumferential direction of the third ring 30, as shown in the illustrated example. However, as long as the airtightness of the first contact surface 11, the airtight sheet 8, and the second contact surface 21 is ensured, they may be provided at equal intervals in the circumferential direction of the third ring 30 in multiple locations, particularly four or more locations, or even just in one location.

[0054] Preferably, the third ring 30 has third support portions 34 and 35 that fix the third ring 30 to the inner wall material 3. The support portions of the third ring 30 are not particularly limited and may be hook-shaped portions or protrusions that are not continuous in the circumferential direction, but the support portion in the illustrated example has a third support cylindrical portion 34 that fits into the opening of the inner wall material 3 with or without play, and a third flange portion 35 provided on the portion of the third support cylindrical portion 34 that protrudes to the interior R side. The inner wall material 3 is sandwiched between the third flange portion 35 and the third inner wall portion 31, and the third support cylindrical portion 34 fits into the opening of the inner wall material 3, thereby fixing the third ring 30 to the inner wall material 3. The advantages of having the third support portions 34 and 35 are the same as the advantages of having the second support portions 24 and 25 in the first example.

[0055] Furthermore, it is preferable that the third ring 30 has third retaining portions 38 and 39 for holding the second elastic ring 20. The third retaining portions 38 and 39 are not particularly limited, but in the illustrated example, it is preferable that they have a retaining cylindrical portion 38 that protrudes from the outdoor E side surface of the third inner wall portion 31 so as to be located outside the outer peripheral edge of the second elastic ring 20, and it is more preferable that they have an annular portion 39 that protrudes from the retaining cylindrical portion 38 so as to be located on the outdoor E side of the peripheral edge of the second elastic ring 20. The second elastic ring 20 is held between the annular portion 39 and the third inner wall portion 31 so as to surround the retaining cylindrical portion 38. As a result, the second elastic ring 20 and the third ring 30 are integrated, making it easy to position the airtight sheet 8 and attach the first elastic ring 10.

[0056] The rest is basically the same as in the first example, so I will omit further explanation.

[0057] <Example 4> Figures 11 and 12 show a fourth example of the hole reconstruction device. This fourth example differs from the second example described above in that a fixing means for detachably fixing the first elastic ring 10 and the second elastic ring 20 is provided as a third ring 30. More specifically, in this fourth example, the first elastic ring 10 is the same as in the second example, but the entire surface of the second elastic ring 20 on the outdoor E side is the second contact surface 21, and it does not have a second cylindrical portion 22 and a second wall portion 23. Instead, in this fourth example, there is a third ring 30 positioned adjacent to the indoor R side of the second elastic ring 20, having a third wall portion 37 that extends radially toward the center DD beyond the innermost peripheral edge 20i of the second elastic ring 20, and a third fitting portion 36 provided on the outdoor E side of the third wall portion 37, the overhang portion 12 protruding radially toward the center DD beyond the innermost peripheral edge 20i of the second elastic ring 20 and the innermost peripheral edge 30i of the third ring 30. The first fitting portion 15 is fitted into the third fitting portion 36, so that the first contact surface 11 is pressed toward the second contact surface 21 via the peripheral edge of the airtight sheet 8.

[0058] The material of the third ring 30, the preference for providing the third support parts 34, 35 and the third retaining parts 38, 39 on the third ring 30, etc., are the same as in the third example, and the fitting structure is the same as in the second example, so we will omit further explanation.

[0059] <Example 5> Figure 14 shows a fifth example of a hole reconstruction device. In this fifth example, the first elastic ring 10 has a first cylindrical portion 17 and a first contact flange portion 18 provided on its outer circumferential surface, with the indoor R-side surface of the first contact flange portion 18 being the first contact surface 11. The second elastic ring 20 has a second cylindrical portion 28 into which the first cylindrical portion 17 is inserted and fitted, and a second contact flange portion 29 provided on its outer circumferential surface, with the outdoor E-side surface of the second contact flange portion 29 being the second contact surface 21. Therefore, the first contact flange portion 18 of the first elastic ring 10 is positioned adjacent to the outdoor E side of the airtight sheet 8, and the second contact flange portion 29 of the second elastic ring 20 is positioned adjacent to the indoor R side of the airtight sheet 8, and the first cylindrical portion 17 is inserted and fitted into the second cylindrical portion 28, so that the peripheral edge portion 8e of the opening in the airtight sheet 8 is airtightly sandwiched between the first contact surface 11 and the second contact surface 21 in a continuous circumferential direction, and the first elastic ring 10 and the second elastic ring 20 are detachably fixed to each other.

[0060] In the illustrated example, the second cylindrical portion 28 functions as a support portion that supports the second elastic ring 20 relative to the inner wall material 3 by fitting into the opening in the inner wall material 3. However, the second cylindrical portion 28 does not necessarily have to fit into the opening in the inner wall material 3 (for example, the first cylindrical portion 17 may extend from the first contact flange portion 18 toward the outside E, and the second support cylindrical portion may extend from the second contact flange portion 29 toward the outside E).

[0061] The first elastic ring 10 is fixed to the second elastic ring 20 by friction between the outer circumferential surface of the first cylindrical portion 17 and the inner circumferential surface of the second support cylindrical portion. To further strengthen this fixation, as shown in the illustrated example, a protrusion 28p may be provided on the outer circumferential surface of the second cylindrical portion 28, and a recess 17r may be provided on the outer circumferential surface of the first cylindrical portion 17, into which the protrusion 28p of the outer circumferential surface of the second cylindrical portion 28 fits, so that the peripheral edge 8e of the opening of the airtight sheet 8 is airtightly sandwiched between the first contact surface 11 and the second contact surface 21 in a continuous circumferential direction, and the two are fitted together. Although not shown, a recess may be provided on the outer circumferential surface of the second cylindrical portion 28, and a protrusion may be provided on the outer circumferential surface of the first cylindrical portion 17, into which the recess of the outer circumferential surface of the second cylindrical portion 28 fits. When these protrusions 28p and recesses 17r are provided, they may be provided in pairs as shown in the illustrated example, or in multiple pairs. Furthermore, it is preferable that the convex portion 28p and concave portion 17r are continuous in an annular shape along the circumferential direction of the first elastic ring 10 and the second elastic ring 20, but they may also be provided at equal intervals in the circumferential direction of the first elastic ring 10 and the second elastic ring 20 in multiple locations, particularly four or more locations, or even just one location.

[0062] <Example of an elastic lid> To ensure airtightness of the holes remaining in the wall W after the piping and wiring have been removed, or to prepare holes in the wall W in advance for future piping and wiring, it is also preferable to have an elastic cover 40 that is attached in place of the first elastic ring 10, as shown in Figures 15 and 16. That is, this elastic cover 40 has an annularly continuous fourth contact surface 41 provided on one side in the thickness direction TD, and a closing portion 42 that covers the entire area radially DD towards the center of the fourth contact surface 41. Reference numeral 40e indicates the outermost edge of the elastic cover. The fourth contact surface 41, like the first contact surface 11, has an outer peripheral edge 41e having a minimum diameter larger than the maximum diameter of the opening in the airtight sheet 8, and an inner peripheral edge 41i having a maximum diameter smaller than the minimum diameter of this outer peripheral edge 41e. Furthermore, either the elastic cover 40 or the second elastic ring 20 is positioned adjacent to the outdoor E side of the airtight sheet 8, and the other is positioned adjacent to the indoor R side of the airtight sheet 8, and the peripheral edge of the opening in the airtight sheet 8 is airtightly sandwiched between the fourth contact surface 41 and the second contact surface 21 in a continuous circumferential direction, and the elastic cover 40 and the second elastic ring 20 are detachably fixed to each other by fixing means. Preferably, a knob 43 is provided on the indoor R side surface of the elastic cover 40 at an appropriate location such as the central part. The illustrated example shows the first elastic ring 10 of the first example transformed into the elastic cover 40, but the first elastic ring 10 of the third to fifth examples may also be transformed into the elastic cover 40. Therefore, except for the closing portion 42 and the knob 43, the configuration can be the same as the first elastic ring described above. [Industrial applicability]

[0063] The present invention can be used without particular limitations as long as it is a wall having an airtight sheet. [Explanation of Symbols]

[0064] 10…First elastic ring, 11…First contact surface, 11e…First outer edge, 11i…First inner edge, 12…Protruding part, 13…First wall part, 14…First cylindrical part, 15…First fitting part, 17…First cylindrical part, 18…First contact flange part, 2…Outer wall material, 20…Second elastic ring, 21…Second contact surface, 21e…Second outer edge, 21i…Second inner edge, 22…Second cylindrical part, 23…Second wall part, 24,25…Second support part, 24…Second support cylindrical part, 25…Second flange part, 26…Second fitting part, 28…Second cylindrical part, 29…Second contact flange Part, 3...Inner wall material, 30...Third ring, 31...Third inner wall part, 32...Third cylindrical part, 33...Third outer wall part, 34,35...Third support part, 34...Third support cylinder part, 35...Third flange part, 36...Third fitting part, 37...Third wall part, 38,39...Retaining part, 38...Retaining cylinder part, 39...Annular part, 4...Ventilation layer, 40...Elastic cover, 41...Fourth contact surface, 42...Closing part, 43...Knob part, 5...Breathable waterproof sheet, 6...Structural face material, 7...Insulation material, 8...Airtight sheet, 9...Sleeve, E...Outdoor, R...Indoor, W...Wall.

Claims

1. A hole reconstruction device that is attached to an opening in an airtight sheet, It has a first elastic ring that is continuous in an annular shape and a second elastic ring that is continuous in an annular shape, The first elastic ring has a first contact surface that is continuous in an annular shape and provided on one side in the thickness direction, and a second protruding portion that extends radially towards the center from the first contact surface so as to form the innermost periphery of the first elastic ring. The second elastic ring has a second contact surface that is continuous in an annular shape and is provided on one side in the thickness direction. The aforementioned protruding portion extends radially towards the center beyond the innermost peripheral edge of the second elastic ring. The peripheral edge of the opening in the airtight sheet is airtightly sandwiched between the first contact surface and the second contact surface in a continuous circumferential manner, and the first elastic ring and the second elastic ring are provided with fixing means for detachably fixing them to each other. A device for reconstructing holes in an airtight sheet, characterized by the above.

2. The first elastic ring is positioned adjacent to the outdoor side of the airtight sheet. The second elastic ring is positioned adjacent to the interior side of the airtight sheet. The maximum diameter of the outermost edge of the first elastic ring and the maximum diameter of the outer edge of the first contact surface are smaller than the minimum diameter of the outer edge of the second contact surface. The device for reconstructing holes in an airtight sheet according to claim 1.

3. The first elastic ring has a first wall portion located on the indoor side and continuous in an annular shape, and a first cylindrical portion extending from the first wall portion to the outdoor side, the first contact surface is the indoor side surface of the first wall portion, and the protruding portion is the portion that protrudes radially toward the center from the first cylindrical portion. The second elastic ring has a second cylindrical portion that is inserted through the opening in the airtight sheet and the radial center side of the first wall portion, and a second wall portion that extends radially outward from the second cylindrical portion and is continuous in an annular shape. The peripheral edge of the airtight sheet and the first wall are airtightly sandwiched between the second contact surface and the indoor side surface of the second wall. The device for reconstructing holes in an airtight sheet according to claim 2.

4. The first elastic ring has a first fitting portion provided on the indoor side surface of the protruding portion, The second elastic ring has a second fitting portion provided on the portion facing the first fitting portion, The first fitting portion is fitted into the second fitting portion, so that the first contact surface is pressed against the second contact surface side via the peripheral edge of the airtight sheet. The device for reconstructing holes in an airtight sheet according to claim 2.

5. The second elastic ring has a support portion that fixes the second elastic ring to the inner wall material. The device for reconstructing holes in an airtight sheet according to claim 3 or 4.

6. The first elastic ring has a first fitting portion provided on the indoor side surface of the protruding portion, The third ring has a third inner wall portion positioned adjacent to the indoor side of the second elastic ring, a third cylindrical portion extending from the third inner wall portion to the outdoor side via the opening in the airtight sheet and the radial center side of the first wall portion, and a third outer wall portion that protrudes radially outward from the third cylindrical portion. The aforementioned protruding portion extends radially towards the center beyond the innermost peripheral edge of the second elastic ring and the innermost peripheral edge of the third ring. The portion of the second elastic ring having the second contact surface, the peripheral edge of the airtight sheet, and the first wall portion are airtightly sandwiched between the outdoor surface of the third inner wall portion and the indoor surface of the third outer wall portion. The device for reconstructing holes in an airtight sheet according to claim 2.

7. The first elastic ring has a first wall portion located on the indoor side and continuous in an annular shape, and a first cylindrical portion extending from the first wall portion to the outdoor side, the first contact surface is the indoor side surface of the first wall portion, the protruding portion is a portion that protrudes radially towards the center from the first cylindrical portion, and the protruding portion has a first fitting portion. The third ring is positioned adjacent to the indoor side of the second elastic ring and has a third wall portion that extends radially towards the center beyond the innermost peripheral edge of the second elastic ring, and a third fitting portion provided on the outdoor side surface of the third wall portion. The aforementioned protruding portion extends radially towards the center beyond the innermost peripheral edge of the second elastic ring and the innermost peripheral edge of the third ring. The first fitting portion is fitted into the third fitting portion, so that the first contact surface is pressed against the second contact surface side via the peripheral edge of the airtight sheet. The device for reconstructing holes in an airtight sheet according to claim 2.

8. The third ring has a support portion for fixing the third ring to the inner wall material and a holding portion for holding the second elastic ring. The device for reconstructing holes in an airtight sheet according to claim 6 or 7.

9. It has an elastic cover which is attached in place of the first elastic ring, The elastic cover has a fourth contact surface that is continuous in an annular shape and provided on one side in the thickness direction, and a closing portion that covers the entire area radially towards the center of the fourth contact surface. Either the elastic cover or the second elastic ring is positioned adjacent to the outdoor side of the airtight sheet, and the other is positioned adjacent to the indoor side of the airtight sheet, and the peripheral edge of the opening in the airtight sheet is airtightly sandwiched between the fourth contact surface and the second contact surface in a continuous circumferential direction, and the elastic cover and the second elastic ring are provided with fixing means for detachably fixing them to each other. The device for reconstructing holes in an airtight sheet according to claim 1 or 2.

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