Airtight Structure of Building and Airtight Construction Method

Abstract

To provide an airtight structure of a building in which an airtight line is formed by installing an airtight sheet on the indoor side of the building frame along the outer peripheral wall of the building, the airtight structure of a building being capable of efficiently forming an airtight line without gaps around a protruding member provided on the indoor side of the building frame, and a construction method of the same.SOLUTION: The periphery of the connecting portion between a floor beam 1 and other structural members constituting the building frame and a horizontal brace 7 and other protruding members attached to the structural members and extending toward the indoor side is surrounded by a heat-shrinkable airtight sheet piece 8 for the connection portion. The periphery of the connecting portion is hermetically sealed while the airtight sheet piece 8 is heat-shrunk.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application relates to an airtight structure and an airtight construction method for a portion along the outer peripheral wall of a building.

Background Art

[0002] In a portion along the outer peripheral wall of a steel-frame building, a heat insulating material is filled on the indoor side of the frame surface surrounded by columns and beams, and an airtight sheet (airtight film) made of polyethylene film or the like is further stretched on the indoor side thereof, so that a heat insulating and airtight line is formed on the indoor side of the frame surface. A so-called internal heat insulation type heat insulating and airtight structure is known. In such a heat insulating and airtight structure, a heat insulating material is also filled on the indoor side surface of a beam supporting an upper floor slab (for example, between upper and lower flanges of an H-shaped steel beam), and the airtight sheet stretched on the heat insulating material of the wall surface is extended from the side surface of the beam to the lower surface of the floor slab to surround the connection portion between the beam and the floor slab. The present applicant has also proposed, for example, in Patent Documents 1 and 2, a heat insulating and airtight structure in which, in addition to the connection portion between the beam and the floor slab, the direct connection portion between beams, the base of a horizontal brace attached to a beam, etc. are surrounded by an airtight sheet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional heat insulation and airtight structure, adhesives, double-sided tapes, staples, etc. are used when attaching the airtight sheet to the profiled steel, heat insulation material, floor slab, etc., or when bonding the overlapping parts of the airtight sheets together. However, there are many protruding members with irregular shapes on the indoor side of the building structure surface, such as the direct connection part between beams, the connection part between a beam and a floor slab, further horizontal braces extending obliquely from the direct connection part between beams, and floor slab supports attached to the flange of a beam to support the floor slab. Gaps that cause airtightness defects are likely to occur around them. At an actual construction site, cutting the airtight sheet so as to appropriately surround these parts and closely adhering them without gaps using tape or adhesive is a very laborious task, and differences in construction quality also occur depending on the skill level of the constructor. There is also a method of fitting a gap-filling member made of polypropylene resin or the like pre-formed according to such special parts, but it is still difficult to enhance the adhesion to adjacent members, and the cost also increases.

[0005] Therefore, the invention disclosed in the present application provides an airtight structure of a building and a construction method thereof that can efficiently form an airtight line without gaps around a protruding member provided on the indoor side of the building structure surface.

Means for Solving the Problems

[0006] In order to solve the above problems, the invention disclosed in the present application is an airtight structure of a building in which an airtight sheet is stretched on the indoor side of the building structure surface along the outer peripheral wall of the building to form an airtight line. A wall heat insulation material is built into the building structure surface, and an airtight sheet for general parts is stretched on the indoor side surface of the wall heat insulation material. The structural material constituting the building structure surface and the protruding member attached to the structural material and extending indoors The connection part is are surrounded by an airtight sheet piece having heat shrinkability, and when the airtight sheet piece is in a state of heat shrinkage , the overlapping part of the airtight sheet piece, the protruding member, and the airtight sheet for the general part is airtightly sealed, an airtight line is formed in which the airtight sheet for general parts and the airtight sheet piece surrounds the connection part are continuous. The basic configuration is adopted.

[0007] In the airtight structure of the building according to the above basic configuration, a cut portion is formed in the airtight sheet for the general part, and the airtight sheet for the general part is stretched so that the protruding member is accommodated in the cut portion, and the airtight sheet piece for the connection part surrounds the periphery of the cut portion and is placed on the airtight sheet for the general part. It can be made like this.

[0008] In the airtight structure of the building configured as described above, at least one cut portion that opens to one side is formed in the airtight sheet piece for the connection part, and the divided pieces divided by the cut portion are stretched so as to surround the protruding member. It can be made like this.

[0009] Furthermore, a plurality of airtight sheet pieces for the connection part are stretched so as to sandwich the protruding member between the divided pieces of each other can be made.

[0010] Further, The invention disclosed in the present application adopts an additional configuration in which the structural material is a floor beam made of H-shaped steel, an inter-beam heat insulating material is arranged in a recess surrounded by the web and the upper and lower flanges of the floor beam, and the airtight line is formed on the indoor side of the inter-beam heat insulating material.

[0011] As a more specific configuration, the protruding member is a horizontal brace attached to a beam orthogonal to the floor beam, the airtight sheet piece for the connection part has a shape in which one side is longer than its opposite side, and two cut portions opening to the one side are formed. The two cut portions are separated in a substantially figure-eight shape toward the one side, the width dimension of the split piece cut out between the two cut portions is formed larger than the width dimension of the horizontal brace, and the airtight sheet piece for the connection part can be made to be stretched so as to sandwich the horizontal brace from above and below with the center of the width of the split piece aligned with the axis of the horizontal brace.

[0013] Further, the invention disclosed in the present application, as a method for airtight construction of a building for forming an airtight line on the indoor side of the building body surface along the outer peripheral wall of the building, includes a step of stretching an airtight sheet for a general part on the indoor side of the building body surface, a step of covering and temporarily fixing an airtight sheet piece for a connection part having heat shrinkability around a protruding member joined to a structural material constituting the building body surface and extending indoors, and a step of heating and heat-shrinking the airtight sheet piece for the connection part to airtightly seal the overlapping portions of the airtight sheet piece for the connection part, the protruding member, and the airtight sheet for the general part. [Effect of the Invention]

[0014] According to the airtight structure and the airtight construction method of the building configured as described above, an airtight line without gaps can be efficiently formed around the protruding member provided on the indoor side of the building body surface.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0016] Hereinafter, embodiments of the invention disclosed in the present application will be described with reference to the drawings.

[0017] <First Embodiment> FIGS. 1 to 4 show an airtight structure and an airtight construction method of a building according to a first embodiment of the invention disclosed in the present application. The illustrated part is near the floor beam along the outer peripheral wall of a steel-frame building.

[0018] The entire vertical building structure surface surrounded by structural materials such as columns (not shown) made of H-shaped steel and floor beams 1 is built in with board-shaped wall insulation materials 2 made of polystyrene foam or the like. Further, in the U-shaped recess surrounded by the upper flange 11, web 13, and lower flange 12 of the floor beam 1, a pack-shaped inter-beam insulation material 3 in which a polyethylene film bag body having airtightness and moisture-proofness is filled with glass wool is pushed in. On the floor beam 1, the edge of the upper floor slab 4 made of an ALC panel or the like is placed.

[0019] As shown in FIG. 2, in the range from the bottom surface of the upper floor slab 4 to the lower floor slab 4 (not shown) through the indoor-side surfaces of the inter-beam insulation material 3 and the wall insulation material 2, an airtight sheet 5 for general parts is continuously stretched. This airtight sheet 5 for general parts may be a polyethylene-based airtight sheet or the like that does not have heat shrinkability and is commonly used in the past, or an airtight sheet having heat shrinkability. Here, the "general part" means a part that is generally flat over a wide range and, even if there are some irregularities or steps, an airtight sheet 5 in the form of a wide long roll can be easily stretched along the steps. In the exemplary part, at the joint between the floor beam 1 and the beam 6 (conveniently called the "orthogonal beam") orthogonal to the floor beam 1, since the airtight sheet 5 for general parts interferes with the lower flange 62 of the orthogonal beam 6, the interfering part is stretched by cutting the airtight sheet 5 for general parts to sandwich the lower flange 62.

[0020] In the exemplary part, a horizontal brace 7 is attached to the connection part between the floor beam 1 and the orthogonal beam 6. The horizontal brace 7 is attached by bolt - nut fastening a wing - plate - shaped mounting plate 72 welded to the end of a round bar 71 to the lower flange 62 of the orthogonal beam 6. In order to air - tightly surround the base of this horizontal brace 7, in the exemplary embodiment, two air - tight sheet pieces 8 (8A, 8B) having heat - shrinkability are used. These are called air - tight sheet pieces 8 for the connection part. Also, the "connection part" here means the peripheral part of the connection location between structural members such as columns and floor beams 1, and the horizontal brace 7 extending indoors and attached to the structural member, various mounting brackets, and other protruding members. An example of the construction procedure for air - tightly sealing the base of the horizontal brace 7 using these air - tight sheet pieces 8 will be described with reference to FIGS. 3 and 4.

[0021] The heat - shrinkable air - tight sheet piece 8 used for the connection part is a transparent or semi - transparent flexible sheet material made of a resin material such as polyolefin, polyvinyl chloride, polypropylene, etc. As shown in FIGS. 3 and 4, the air - tight sheet piece 8 for the connection part is cut into a rectangle or the like of an appropriate size according to the range of the connection part, and at one side, one or two cut portions 81 that open intersecting the one side are formed. First, as shown in FIG. 3, the air - tight sheet piece 8A is arranged on the upper side of the horizontal brace 7. At this time, the upper half without the cut portion 81 is covered on the lower surface of the floor slab 4, the inter - beam heat insulation material 3, the upper flange 61 and the web 63 of the orthogonal beam 6, and the central divided piece 82 divided by the cut portion 81 is covered on the mounting plate 72. After the air - tight sheet piece 8 is positioned in place, it is temporarily fixed by taping it to the floor beam 1 or the orthogonal beam 6 at several locations. Alternatively, an adhesive layer may be provided near the end of the air - tight sheet piece 8 and it may be attached to the floor beam 1 or the orthogonal beam 6.

[0022] Subsequently, as shown in FIG. 4, an airtight sheet piece 8B is disposed below the horizontal brace 7. At this time, the lower half where the cut portion 81 is not formed covers the wall heat insulating material 2 and the lower flange 62 of the orthogonal beam 6, and the central divided piece 83 divided by the cut portion 81 is applied to the lower surface of the mounting plate 72. This airtight sheet piece 8B is also temporarily fixed to the wall heat insulating material 2 and the orthogonal beam 6 at several locations with tape or via an adhesive layer.

[0023] Then, the periphery of the overlapping portion of the airtight sheet piece 8A and the airtight sheet piece 8B is heated by a heat gun or the like. While heating, the overlapping condition of the divided pieces 82 and 83 of the airtight sheet pieces 8A and 8B may be adjusted as necessary. When the airtight sheet pieces 8A and 8B thermally contract due to heating, the overlapping portions of each other are welded, and also adhere to the surrounding structural materials and heat insulating materials, so that the periphery of the base of the horizontal brace 7 is hermetically sealed. In this way, an airtight line in which the airtight sheet 5 for the general part and the airtight sheet piece 8 for the connection part are continuous is formed.

[0024] <Second Embodiment> FIG. 5 shows the airtight structure of a building according to the second embodiment of the invention disclosed in the present application. The illustrated part is the same as the part shown in FIG. 1, and the same reference numerals are given to the parts and members common to the first embodiment, and detailed description thereof is omitted.

[0025] Similar to the first embodiment, board-shaped wall heat insulating materials 2 are built in the entire vertical building surface. Also, a pack-shaped inter-beam heat insulating material 3 having airtightness and moisture-proofness is pushed into the recess on the side surface of the floor beam 1. In the second embodiment, this inter-beam heat insulating material 3 is filled so as to bulge inward from the side edge of the flange of the floor beam 1. Then, an airtight sheet 5 for the general part is stretched on the indoor surface of the wall heat insulating material 2, and its upper part extends to the vicinity of the lower part of the inter-beam heat insulating material 3.

[0026] Even at the exemplary part, a horizontal brace 7 is attached to the connection part between the floor beam 1 and the orthogonal beam 6. In order to airtightly surround the base of this horizontal brace 7, an airtight sheet piece 8 (8A, 8B) for the connection part having heat shrinkability is used. As shown in FIGS. 6 and 7, the airtight sheet piece 8 for the connection part is cut into an isosceles trapezoid or the like of an appropriate size according to the range of the connection part, and two cut portions 81 that intersect with the side and open are formed on the long base side thereof. The two cut portions 81 are separated in a substantially inverted V shape toward the long base side, and the divided pieces 82 and 83 cut out therebetween are formed such that their width dimensions are sufficiently larger than the width dimension of the mounting plate 72 of the horizontal brace 7.

[0027] During construction, first, as shown in FIG. 6, the airtight sheet piece 8A is arranged above the horizontal brace 7, and the upper short base side where the cut portion 81 is not formed is temporarily fixed to the upper part of the interbeam heat insulating material 3 (or the bottom surface of the floor slab 4) with tape or the like. At this time, it is preferable to valley-fold the airtight sheet piece 8A along the virtual center line in its lateral width direction along the inner corner of the interbeam heat insulating material 3 and the orthogonal beam 6 and align the width center of the central divided piece 82 with the axis of the horizontal brace 7.

[0028] Similarly, as shown in FIG. 7, the airtight sheet piece 8B is arranged below the horizontal brace 7, and the lower short base side where the cut portion 81 is not formed is temporarily fixed to the wall surface heat insulating material 2 with tape or the like. Also here, the airtight sheet piece 8B is valley-folded along the virtual center line in its lateral width direction along the inner corner of the interbeam heat insulating material 3 and the orthogonal beam 6, and the width center of the central divided piece 83 is aligned with the axis of the horizontal brace 7.

[0029] When each of the divided pieces 82 and 83 of the airtight sheet pieces 8A and 8B covers the upper and lower parts of the mounting plate 72 and the shape is adjusted, the periphery of the overlapping portion of the two airtight sheet pieces 8A and 8B is heated with a heat gun or the like. In this way, the overlapping portions of the two airtight sheet pieces 8A and 8B are welded, and the periphery thereof is hermetically sealed, so that an airtight line continuous with the airtight sheet 5 for the general part and the airtight sheet piece 8 for the connection part is formed. In this second embodiment, an example is shown in which the upper part of the airtight sheet 5 for the general part is covered and stretched near the lower part of the beam heat insulator 3. However, as long as a continuous airtight line can be formed as described above, the range where the airtight sheet 5 for the general part is stretched can of course be appropriately changed.

[0030] <Third Embodiment> FIG. 8 shows the airtight structure of a building according to the third embodiment of the invention disclosed in the present application. The illustrated part is the same as the part shown in FIGS. 1 and 5, and the same reference numerals are given to the parts and members common to the first embodiment, and detailed description thereof is omitted.

[0031] In the third embodiment, the support structure of the floor slab 4 is different from that of the first embodiment. That is, the edge of the upper floor slab 4 does not rest on the floor beam 1, but is supported at a position slightly recessed inward of the room from the floor beam 1 via a plurality of floor slab receiving brackets 9 attached to the upper flange 11 of the floor beam 1 at appropriate intervals. The floor slab receiving bracket 9 is a short member that is not continuous in the material length direction of the floor beam 1, and is formed, for example, by joining two channel steel pieces. Therefore, a minute gap is formed between the floor beam 1 and the edge of the floor slab 4.

[0032] In such a part, before placing the floor slab 4 on the floor slab receiving bracket 9, the airtight sheet 5 for the general part stretched on the inner surface of the wall heat insulator 2 and the beam heat insulator 3 is extended continuously up to the floor structure of the upper floor part. At a location where the airtight sheet 5 for the general part and the floor slab receiving bracket 9 interfere, a cutout (not shown) is formed in the airtight sheet 5 according to the shape of the floor slab receiving bracket 9, and the airtight sheet 5 is stretched so that the floor slab receiving bracket 9 is accommodated in the cutout.

[0033] Then, after placing and fixing the floor slab 4 on the floor slab receiving fitting 9, an airtight sheet piece 8C for the connection part is placed on the floor slab receiving fitting 9 exposed from the incision part, and the periphery of the incision part is surrounded. The airtight sheet piece 8C for the connection part is stretched so as to cover from the lower surface of the floor slab 4 to the inter-beam heat insulating material 3, and temporarily fixed in place. When the airtight sheet piece 8C is heated from that state, the airtight sheet piece 8C thermally contracts and adheres closely to the floor slab receiving fitting 9 and its periphery, and the overlapping part with the airtight sheet 5 for the general part is also hermetically sealed.

[0034] As described in the above two examples, at the location where the continuity of the airtight sheet 5 is interrupted by the irregularly shaped protruding members attached to the structural materials such as columns and floor beams 1 that constitute the building structure surface, a heat-shrinkable airtight sheet piece 8 is placed to cover the periphery of the protruding member, and by thermally contracting the airtight sheet piece 8, an airtight line without gaps can be efficiently formed on the indoor side of the connection part between the structural material and the protruding member. The heat-shrinkable airtight sheet pieces 8 are welded to each other at their overlapping parts and also adhere closely to the surrounding members. In addition, as the protruding member, in addition to the horizontal brace 7 and the floor slab receiving fitting 9 exemplified, for example, a channel steel directly connected as a beam connecting member to the side surface of the web 13 of the floor beam 1 is also included.

[0035] FIG. 9 shows the form variations of the airtight sheet piece 8 for the connection part. The outer shape of the airtight sheet piece 8 for the connection part may be cut into a trapezoid as shown in FIG. (a) or a rectangle as shown in FIG. (b) according to the shape of the connection part. The cut portion 81 may also be formed in parallel as shown in FIG. (a) or in a U-shape as shown in FIG. (b) according to the shape of the connection part. Also, the positional relationship, number, length, etc. of the cut portions 81 may be appropriately changed.

[0036] For example, when the airtight sheet 5 for the general part is adhered near the inner corner of the direct connection part between beams with its edge along the inner corner, it fits well by overlapping these airtight sheet pieces 8 along the virtual center line in the lateral direction along the inner corner onto the airtight sheet 5 for the general part. When a protruding member such as the horizontal brace 7 is arranged with its center line aligned with the inner corner, two cut portions 81 are formed symmetrically left and right as shown in the example, and by covering the central split piece over the protruding member, the protruding member can be preferably surrounded. If the side length on the side where the cut portion 81 is formed is made longer than the side length on the opposite side, the area of the portion surrounding the protruding member can be relatively increased. Also, by forming the two cut portions 81 in a C-shape, it can be made easier to align with the mounting plate 72 of the horizontal brace 7 etc.

[0037] Figure 10 shows other form variations of the airtight sheet piece 8 for the connection part. When the joint part between the structural member and the protruding member can be surrounded by a single airtight sheet piece 8, a single cut portion 81 is formed in the single airtight sheet piece 8, and the tip of the cut portion 81 is further cut or punched according to the shape of the protruding member to process it into a shape that is easy to surround the protruding member. The (a) figure shows the cut form when covering, for example, the upper half of an H-shaped steel. The (b) figure shows the cut form when covering a rod-shaped member or a tubular member like a brace. The (c) figure shows the cut form when covering the end of a channel steel etc. These airtight sheet pieces 8 may have the cut portion 81 in the vertical direction or the horizontal direction according to the shape of the adhering part.

[0038] Not limited to these forms, if the airtight sheet piece 8 having heat shrinkability is cut into various forms and used, anyone can easily airtightly seal around a protruding member having a complex shape. Since the airtight sheet piece 8 with heat shrinkability has appropriate flexibility even after shrinkage depending on its material, even if the building structure is deformed due to an earthquake or vibration etc., it maintains its airtight performance without being affected. It has much higher versatility and lower cost compared to the method of preparing a molded product according to the shape of the protruding member. Thus, the airtight performance in a steel frame building can be improved.

[0039] Note that the technical scope of the invention disclosed in this application should not be construed in a limited manner by the exemplified embodiments, but should be conceptually construed based on the description in the claims. The names of the components used in the claims and the specification are for convenience in facilitating a specific understanding of the invention, and such names do not unduly limit the concept and properties of the components. When implementing the invention disclosed in this application, the detailed shape, dimensions, structure, material, quantity, form of connection with other elements, relative positional relationship, etc. of the components not specifically specified in the claims can be appropriately modified within the range where substantially the same or greater operational effects as the exemplified embodiments can be obtained.

[0040] In addition, the embodiments and other matters disclosed in this specification can also be grasped as the technical ideas shown in the following supplementary notes. (Supplementary Note 1) In an airtight structure of a building in which an airtight sheet is stretched on the indoor side of a body structure surface along the outer peripheral wall of the building to form an airtight line, the periphery of the connection part between the structural material constituting the body structure surface and the protruding member attached to the structural material and extending indoors is surrounded by an airtight sheet piece having heat shrinkability, and the periphery of the connection part is airtightly sealed in a state where the airtight sheet piece is heat-shrunk. An airtight structure of a building characterized by this. (Supplementary Note 2) In the airtight structure of a building described in Supplementary Note 1, a wall heat insulating material is built into the vertical body structure surface surrounded by the structural material, an airtight sheet for general parts is stretched on the indoor side surface of the wall heat insulating material, and an airtight line including the airtight sheet for general parts and the airtight sheet piece that seals the periphery of the connection part is formed. An airtight structure of a building characterized by this. (Supplementary Note 3) In the airtight structure of a building described in Supplementary Note 2, the structural material is a floor beam made of H-shaped steel, a beam space heat insulating material is arranged in a recess surrounded by the web and the upper and lower flanges of the floor beam, and the airtight line is formed on the indoor side of the beam space heat insulating material. An airtight structure of a building characterized by this. (Supplementary Note 4) In the airtight structure of the building described in Supplementary Note 2 or Supplementary Note 3, at least one cut portion that opens on one side is formed in the airtight sheet piece for the connection portion, and the divided piece divided by the cut portion is stretched so as to surround the protruding member. The airtight structure of the building is characterized by this. (Supplementary Note 5) In the airtight structure of the building described in Supplementary Note 4, a plurality of airtight sheet pieces for the connection portion are stretched so as to sandwich the protruding member between the divided pieces of each other. The airtight structure of the building is characterized by this. (Supplementary Note 6) In the airtight structure of the building described in Supplementary Note 5, the protruding member is a horizontal brace attached to a beam orthogonal to the floor beam, and the airtight sheet piece for the connection portion has a shape in which one side is longer than the opposite side, and two cut portions that open on the one side are formed. The two cut portions are separated in a substantially figure-eight shape toward the one side, and the width dimension of the divided piece cut out between the two cut portions is formed larger than the width dimension of the horizontal brace. The airtight sheet piece for the connection portion is stretched so as to sandwich the horizontal brace from above and below with the width center of the divided piece aligned with the axis of the horizontal brace. The airtight structure of the building is characterized by this. (Supplementary Note 7) In the airtight structure of the building described in Supplementary Note 2 or Supplementary Note 3, a cut portion is formed in the airtight sheet for the general portion, and the airtight sheet for the general portion is stretched so as to accommodate the protruding member in the cut portion, and the airtight sheet piece for the connection portion is covered on the airtight sheet for the general portion so as to surround the periphery of the cut portion. The airtight structure of the building is characterized by this. (Supplementary Note 8) A method for airtight construction of a building, which forms an airtight line on the indoor side of a body surface along the outer peripheral wall of the building, comprising the steps of: stretching an airtight sheet for a general part on the indoor side of the body surface; covering and temporarily fixing an airtight sheet piece for a connection part having heat shrinkability around a protruding member joined to a structural member constituting the body surface and extending indoors; and heating and heat-shrinking the airtight sheet piece for the connection part to airtightly seal a polymerized portion of the airtight sheet piece for the connection part, the protruding member, and the airtight sheet for the general part. The method for airtight construction of a building is characterized by comprising the above steps.

Industrial Applicability

[0041] The invention disclosed in the present application can be widely used as an airtight structure and an airtight construction method at boundary parts inside and outside a building, such as a body surface along the outer peripheral wall of a steel-frame building, as well as a floor part, around a roof, a re-roofing part of the roof, a balcony lower surface, etc.

Explanation of Signs

[0042] 1 Floor beam 11 Upper flange 12 Lower flange 13 Web 2 Wall surface heat insulating material 3 Inter-beam heat insulating material 4 Floor slab 5 Airtight sheet for general part 6 Orthogonal beam 61 Upper flange 62 Lower flange 63 Web 7 Horizontal brace 71 Round bar 72 Mounting plate 8 (8A, 8B, 8C) Airtight sheet piece for connection part 81 Notch 82 Split piece 83 Split piece 9 Floor slab support fitting

Claims

1. In an airtight structure of a building in which an airtight sheet is stretched on the indoor side of a body surface along the outer peripheral wall of the building to form an airtight line, a wall surface heat insulating material is built into the body surface, and an airtight sheet for a general part is stretched on the side surface on the indoor side of the wall surface heat insulating material, and a connection part between a structural material constituting the body surface and a protruding member attached to the structural material and extending indoors is surrounded by an airtight sheet piece having heat shrinkability, in a state where the airtight sheet piece is heat-shrunk, a polymerized portion of the airtight sheet piece, the protruding member, and the airtight sheet for the general part is airtightly sealed, an airtight line in which the airtight sheet for the general part and the airtight sheet piece surrounding the connection part are continuous is formed The airtight structure of a building, characterized by the above.

2. In the airtight structure of a building according to Claim 1, at least one cut portion opening on one side is formed in the airtight sheet piece for the connection part, the divided pieces divided by the cut portion are stretched so as to surround the protruding member The airtight structure of a building, characterized by the above.

3. In the airtight structure of a building according to Claim 2, a plurality of airtight sheet pieces for the connection part are stretched so as to sandwich the protruding member between the divided pieces of each other The airtight structure of a building, characterized by the above.

4. In the airtight structure of a building according to Claim 1, 2 or 3, the structural material is a floor beam made of H-shaped steel, an inter-beam heat insulating material is arranged in a recess surrounded by the web and the upper and lower flanges of the floor beam, the airtight line is formed on the indoor side of the inter-beam heat insulating material The airtight structure of a building, characterized by the above.

5. In the airtight structure of a building according to Claim 4, The protruding member is a horizontal brace attached to a beam orthogonal to the floor beam. The airtight sheet piece for the connection part has a shape in which one side is longer than the opposite side. Two cut portions opening to the one side are formed. The two cut portions are separated in a substantially V shape toward the one side. The width dimension of the split piece cut out between the two cut portions is formed larger than the width dimension of the horizontal brace. The airtight sheet piece for the connection part is stretched so as to sandwich the horizontal brace from above and below with the center of the width of the split piece aligned with the axis of the horizontal brace. An airtight structure of a building, characterized in that.

6. In the airtight structure of a building according to Claim 1, A cut portion is formed in the airtight sheet for the general part. The airtight sheet for the general part is stretched so as to accommodate the protruding member in the cut portion, and The airtight sheet piece for the connection part is covered on the airtight sheet for the general part so as to surround the periphery of the cut portion. An airtight structure of a building, characterized in that.

7. An airtight construction method of a building for forming an airtight line on the indoor side of a body structure surface along the outer peripheral wall of the building, A step of stretching an airtight sheet for the general part on the indoor side of the body structure surface; A step of covering and temporarily fixing an airtight sheet piece for the connection part having heat shrinkability around a protruding member joined to a structural member constituting the body structure surface and extending indoors; A step of heating and heat-shrinking the airtight sheet piece for the connection part to airtightly seal a polymerized portion of the airtight sheet piece for the connection part, the protruding member, and the airtight sheet for the general part; An airtight construction method of a building, characterized by comprising.

Images