JP7497961B2

JP7497961B2 - Sheet waterproofing structure and construction method

Info

Publication number: JP7497961B2
Application number: JP2019082234A
Authority: JP
Inventors: 麻衣子高橋
Original assignee: Lonseal Corp
Current assignee: Lonseal Corp
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2024-06-11
Anticipated expiration: 2039-04-23
Also published as: JP2020180435A

Description

本発明は、屋上や屋根、ベランダ等に防水シートを用いた防水構造、施工方法に関する。 The present invention relates to a waterproof structure and construction method using a waterproof sheet for rooftops, roofs, verandas, etc.

従来、Ｓ造の屋根構造には、断熱材や野地板を母屋に固定し、瓦や金属板などの葺材を重ねた斜屋根の構造がある。これらの構造は葺材が不燃材料であるため、高い防火性能を保持している。屋根の最表面に瓦や金属板などの不燃材で構成される場合は、火災時に野地板の目地部の開きや炎の吹上等については考慮する必要はない。 Traditionally, steel roof structures have a slanted roof structure in which insulation and sheathing boards are fixed to the main building and roofing materials such as tiles and metal sheets are layered on top. These structures have high fire resistance because the roofing materials are non-combustible. If the top surface of the roof is made of non-combustible materials such as tiles or metal sheets, there is no need to consider openings in the sheathing board joints or flames blowing up in the event of a fire.

このように屋根の最表面が瓦や金属板などの不燃材で構成される場合、防水性を確保するために屋根には傾斜が設けられている。瓦で４／１０以上、スレート板で３／１０以上、金属板で１／１０以上の傾斜が一般に設けられている。 When the outermost surface of a roof is made of non-flammable materials such as tiles or metal sheets, the roof is sloped to ensure waterproofing. Generally, tiles have a slope of 4/10 or more, slate sheets have a slope of 3/10 or more, and metal sheets have a slope of 1/10 or more.

また、葺材として粘土瓦が用いられる場合、粘土瓦は重量が重く躯体への負荷が大きくなるとの問題がある。そこで、葺材として軽量な樹脂系屋根材を用いることが提案されている。特許文献１では、屋根の下地上に野地板を固定し、この野地板上に下葺き材を葺いたうえで、下葺き材上に樹脂系屋根材が順次葺かれてなる樹脂系屋根構造であって、樹脂系屋根材は、ガラス繊維混入不飽和ポリエステル系樹脂波板で形成され、このように下地、野地板、下葺き材、樹脂系屋根材を特定することによって、屋根上に葺かれた樹脂系屋根構造の防火性を向上させることができ、建築基準法における耐火試験にも適合可能な樹脂系屋根構造を達成できることが開示されている。 In addition, when clay tiles are used as roofing materials, there is a problem that the clay tiles are heavy and place a large load on the structure. Therefore, it has been proposed to use lightweight resin-based roofing materials as roofing materials. Patent Document 1 discloses a resin-based roof structure in which a sheathing board is fixed to the roof substrate, an underlayment is laid on the sheathing board, and a resin-based roofing material is laid on the underlayment in sequence, and the resin-based roofing material is formed of a glass fiber-mixed unsaturated polyester resin corrugated sheet. It is disclosed that by specifying the substrate, sheathing board, underlayment, and resin-based roofing material in this way, the fire resistance of the resin-based roof structure laid on the roof can be improved, and a resin-based roof structure that can comply with the fire resistance test in the Building Standards Act can be achieved.

特開２００７－３９９０４号公報JP 2007-39904 A

しかし、以上のような従来技術における葺材を用いた構造は、重量が重く躯体に負荷がかかり、さらに水密性に劣るため傾斜を設けた斜屋根でなければ防水性能が確保できないという課題があった。そこで、瓦や金属板などの葺材を重ねた斜屋根に対し、最表面を防水シートで施工することで軽量で高い防水性を保持する方法がある。一方、防水シートは一般的に可燃物であるため、防火性能を確保することが求められる。 However, structures using roofing materials in the above-mentioned conventional technologies have the problem that they are heavy, put a strain on the structure, and have poor watertightness, so waterproofing performance can only be achieved with a sloped roof. One method to achieve this is to apply a waterproof sheet to the top surface of a sloped roof made of layered roofing materials such as tiles and metal sheets, making it lightweight and highly waterproof. However, waterproof sheets are generally flammable, so fire resistance must be ensured.

すなわち本発明においては、傾斜角の小さい屋根における防水構造において、軽量で高い防水性を保持しつつ防火性能を保持するシート防水構造およびその施工方法を提供することを目的とする。 In other words, the objective of the present invention is to provide a lightweight sheet waterproofing structure and construction method that maintains high waterproofing and fire resistance in a waterproofing structure for roofs with a small slope angle.

そこで本発明においては、屋根を形成する間隔を開けて並列する複数の鉄骨で構成された支持部材の上に突き付けて配置され固定される複数の下地板と、隣り合う下地板を突き付けて形成された目地で前記支持部材と略垂直方向である下地板目地部の上側のみに、下地板目地部を覆って下地板に接合され、不燃材料で構成されたテープである目地被覆材と、下地板と目地被覆材の上に敷設固定された防水シートとを備え、前記下地板が断熱材と前記断熱材と積層された野地板からなり、前記野地板が木質系ボード、木質系セメント板、無機質板、ガラス繊維混入樹脂板のいずれかであるシート防水構造とすることができる。また、前記断熱材が前記支持部材側に配置されており、前記野地板側に前記防水シートが固定されているシート防水構造としてもよいし、断熱材をフェノールフォームとしてもよい。さらに目地被覆材がアルミテープであってもよい。
また、別の形態として目地被覆材と下地板との層間に充填された不燃充填材をさらに備えるシート防水構造とすることも好ましい。防水シートについては、熱可塑性樹脂層とガラス不織布層とを有し、ガラス不織布層の上下面に熱可塑性樹脂層が積層されていることも好ましい。防水シートと下地板との接合は防水シートが下地板に接着剤で接着されていてもよい。
施工方法として、屋根を形成する間隔を開けて並列する複数の鉄骨で構成された支持部材の上に複数の下地板を敷設し、複数の下地板を突き付けて下地板目地部を形成し、下地板を支持部材に固定する工程と、前記支持部材と略垂直方向である下地板目地部の上側のみを不燃材料で構成されたテープである目地被覆材で覆う工程と、下地板と目地被覆材の上に防水シートを敷設固定する工程とを備え、前記下地板が断熱材と前記断熱材と積層された野地板からなり、前記野地板が木質系ボード、木質系セメント板、無機質板、ガラス繊維混入樹脂板のいずれかであるシート防水構造の施工方法とすることができる。

Therefore, in the present invention, a sheet waterproof structure can be provided that includes a plurality of underlayments arranged and fixed on a support member composed of a plurality of steel frames arranged in parallel at intervals to form a roof, a joint covering material made of a non-combustible material that is joined to the underlayment only on the upper side of the underlayment joint portion that is approximately perpendicular to the support member at the joint formed by butting adjacent underlayments, and a waterproof sheet laid and fixed on the underlayment and the joint covering material, the underlayment being made of a heat insulating material and a sheathing board laminated with the heat insulating material, the sheathing board being any of a wood board, a wood cement board, an inorganic board, and a glass fiber mixed resin board. Also, the sheet waterproof structure may be such that the heat insulating material is arranged on the support member side and the waterproof sheet is fixed on the sheathing board side, or the heat insulating material may be phenol foam. Furthermore, the joint covering material may be aluminum tape.
As another embodiment, it is also preferable to use a sheet waterproofing structure further including a non-combustible filler filled between the joint covering material and the base plate. It is also preferable that the waterproofing sheet has a thermoplastic resin layer and a glass nonwoven fabric layer, and the thermoplastic resin layer is laminated on the upper and lower surfaces of the glass nonwoven fabric layer. The waterproofing sheet and the base plate may be bonded to each other by an adhesive.
The construction method includes the steps of laying a plurality of subfloors on a support member composed of a plurality of steel beams arranged in parallel at intervals to form a roof, butting the plurality of subfloors together to form subfloor joints, and fixing the subfloors to the support member, covering only the upper side of the subfloor joints, which are approximately perpendicular to the support member, with a joint covering material which is a tape composed of a non-combustible material, and laying and fixing a waterproof sheet on the subfloors and the joint covering material, and the construction method can be a sheet waterproofing structure construction method in which the subfloors are made of insulating material and sheathing boards laminated with the insulating material, and the sheathing boards are any of wood-based boards, wood-based cement boards, inorganic boards, and glass fiber mixed resin boards.

防水シートを用いることで軽量性と高い防水性を保持し、傾斜角度の小さい屋根にも用いることができ、さらに防火性能を保持するシート防水構造およびその施工方法を得ることができる。 By using a waterproof sheet, it is possible to obtain a sheet waterproof structure and its construction method that maintains light weight and high waterproofing properties, can be used on roofs with small slope angles, and also maintains fire resistance.

本発明の一実施形態の防水構造の部分断面図である。1 is a partial cross-sectional view of a waterproof structure according to one embodiment of the present invention. 本発明の一実施形態の防水構造の部分断面図である。1 is a partial cross-sectional view of a waterproof structure according to one embodiment of the present invention. 本発明の一実施形態の防水構造の部分断面図である。1 is a partial cross-sectional view of a waterproof structure according to one embodiment of the present invention. 本発明の一実施形態の防水構造の部分断面図である。1 is a partial cross-sectional view of a waterproof structure according to one embodiment of the present invention. 目地被覆材の変形例を示した部分的な斜視図である。FIG. 13 is a partial perspective view showing a modified example of a joint covering material. 本発明の一実施形態の防水構造の斜視図である。部材の一部を切断し内部の構造を示している。1 is a perspective view of a waterproof structure according to an embodiment of the present invention, in which a part of a member is cut away to show the internal structure.

以下、本発明の実施形態について図面を用いて説明する。
図１を用いて本発明の第１実施形態について説明する。屋根を構成する支持部材１の上に２枚の下地板４が固定され、隣り合う下地板４は突き付けて配置され、目地である下地板目地部Ａの上側に目地被覆材５が配置固定され、下地板４と目地被覆材５との上に防水シート６が敷設され固定されている。目地被覆材５は不燃材料で構成されている。
このように防水シートを用いることで軽量性と高い防水性を保持し、傾斜角度の小さい屋根にも用いることができ、さらに防火性能を保持するシート防水構造およびその施工方法を得ることができる。本実施形態では、シート防水構造とすることで陸屋根とすることができ、屋根の傾斜は傾斜角を０°とすることも可能である。また、傾斜角を０°～３０°程度としてもよい。より傾斜を少なくする場合、１／５０以上することが好ましく、排水性をより向上させる場合は１／２０以上とすることが好ましい。このように傾斜角を小さくすることで施工性が向上し、床面積の大きな構築物を構築しやすくなるとの利点がある。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The first embodiment of the present invention will be described with reference to Fig. 1. Two base boards 4 are fixed onto a support member 1 that constitutes a roof, adjacent base boards 4 are arranged so as to butt against each other, a joint covering material 5 is arranged and fixed on the upper side of the base board joint portion A, which is the joint, and a waterproof sheet 6 is laid and fixed on the base boards 4 and the joint covering material 5. The joint covering material 5 is made of a non-combustible material.
By using the waterproof sheet in this way, it is possible to obtain a sheet waterproof structure and its construction method that maintains light weight and high waterproofness, can be used on roofs with a small angle of inclination, and further maintains fire resistance. In this embodiment, the sheet waterproof structure can be used to create a flat roof, and the roof can be inclined at an angle of 0°. The inclination angle may also be about 0° to 30°. To reduce the inclination even further, it is preferable to set it to 1/50 or more, and to further improve drainage, it is preferable to set it to 1/20 or more. By reducing the inclination angle in this way, there is an advantage that construction is improved and it becomes easier to construct structures with large floor areas.

第１実施形態についてより具体的には鉄骨で構成された支持部材１の上に下地板４が配置され、下地板４は支持部材１にビス（図示なし）によって固定されている。下地板４は野地板２と断熱材３とで構成され、野地板２が上側に断熱材３が下側に向けて配置されている。なお、下側が支持部材１の側となる。そして、下地板４が付き合わされた目地である下地板目地部Ａの上には不燃材料で構成されたテープである目地被覆材５が配置されテープの粘着層によって固定されている。目地被覆材５ａと下地板４の野地板２上を覆って防水シート６が下地板４に接着剤で固定されている。 More specifically, in the first embodiment, a base plate 4 is placed on a support member 1 made of steel, and the base plate 4 is fixed to the support member 1 with screws (not shown). The base plate 4 is composed of a sheathing board 2 and a heat insulating material 3, with the sheathing board 2 facing upward and the heat insulating material 3 facing downward. The lower side is the side of the support member 1. A joint covering material 5, which is a tape made of a non-combustible material, is placed on the base plate joint portion A, which is the joint where the base plate 4 is butted together, and is fixed with the adhesive layer of the tape. A waterproof sheet 6 is fixed to the base plate 4 with adhesive, covering the joint covering material 5a and the sheathing board 2 of the base plate 4.

図６には実施形態の斜視図を示している。支持部材１に上に複数枚の下地板４が敷設され、下地板目地部Ａの上には目地被覆材５が配置し固定されている。そして、下地板４と目地被覆材５の上に防水シート６が敷設され接着剤で固定されている。ここで、支持部材１と略垂直方向の下地板目地部Ａは目地被覆材５で覆われているが、支持部材１の上に設けられた下地板目地部Ｂは目地被覆材５は配置されていない。目地被覆材５は下地板目地部のすべてを覆うことが好ましいが、下側からの炎に対し、支持部材１があることで防火性を有する場合には支持部材１の上に設けられた下地板目地部Ｂには目地被覆材５を配置しなくてもよい。
なお、図６において下地板目地部Ａの位置を明確に示すために目地被覆材５の一部が切断して描かれている。また、図１から図４は図６のＡ‘Ａ’に相当する位置での断面図であるが、図１から図４と図６とは構成する部材に異なる部分があるため図１から図４は図６のＡ‘Ａ’断面図と同一とならない場合がある。図１から図４の支持部材１、下地板４、下地板目地部Ａと目地被覆材５との位置関係が図６のＡ‘Ａ’ に相当する位置で示されている。 6 shows a perspective view of the embodiment. A plurality of base plates 4 are laid on the support member 1, and a joint coating material 5 is placed and fixed on the base plate joint portion A. A waterproof sheet 6 is laid on the base plate 4 and the joint coating material 5 and fixed with an adhesive. Here, the base plate joint portion A that is approximately perpendicular to the support member 1 is covered with the joint coating material 5, but the base plate joint portion B provided on the support member 1 is not provided with the joint coating material 5. It is preferable that the joint coating material 5 covers all of the base plate joint portion, but if the support member 1 provides fire resistance against flames from below, the joint coating material 5 does not need to be placed on the base plate joint portion B provided on the support member 1.
In Fig. 6, a part of the joint covering material 5 is cut away to clearly show the position of the furring board joint portion A. Also, Figs. 1 to 4 are cross-sectional views at a position corresponding to A'A' in Fig. 6, but Figs. 1 to 4 and Fig. 6 may not be the same as the A'A' cross-sectional view in Fig. 6 because the constituent members in Figs. 1 to 4 and Fig. 6 differ in some parts. The positional relationship between the support member 1, furring board 4, furring board joint portion A, and the joint covering material 5 in Figs. 1 to 4 is shown at a position corresponding to A'A' in Fig. 6.

第２実施形態として図３を用いて説明する。第２実施形態は目地被覆材５として鋼板を用いている。支持部材１の上に下地板４が配置され、下地板４は支持部材１にビス（図示なし）によって固定されている。下地板４は野地板２と断熱材３とで構成され、野地板２が上側に断熱材３が下側に向けて配置されている。そして、下地板４が付き合わされた目地である下地板目地部Ａの上には鋼板を折り曲げて形成された帯状の目地被覆材５ｅが配置され、目地被覆材５ｅの両端縁部にビス８が打ち込まれ固定されている。目地被覆材５ｅと下地板４の上を覆って防水シート６が下地板４に接着剤で固定されている。 The second embodiment will be described with reference to FIG. 3. In the second embodiment, a steel plate is used as the joint coating material 5. A base plate 4 is placed on a support member 1, and the base plate 4 is fixed to the support member 1 with screws (not shown). The base plate 4 is composed of a sheathing board 2 and a heat insulating material 3, with the sheathing board 2 facing upward and the heat insulating material 3 facing downward. A band-shaped joint coating material 5e formed by folding a steel plate is placed on the base plate joint portion A, which is the joint where the base plate 4 is butted together, and screws 8 are driven into both end edges of the joint coating material 5e to fix it. A waterproof sheet 6 is fixed to the base plate 4 with adhesive, covering the joint coating material 5e and the base plate 4.

第１および第２実施形態において下地板４は野地板２と断熱材３で構成されているが、下地板４は野地板２でのみで構成されていてもよい。下地板４は火災時に下側からの炎に対し、屋根部分を保持し屋根から炎が吹き出したりするのを防ぐために防火性を有しており、かつ下地板４の上に設けられる防水シート６を敷設固定するための下地平面として機能すればよい。そのため下地板４は平面を有する板状であって炎に対し対抗できる防火性を有した構成とする必要がある。したがって、下地板４を構成する野地板２が平面を有する板状であって炎に対し対抗できる防火性を有した構成とする必要がある。
また、断熱材３を有することで断熱性が向上するため好ましい。また、野地板２と断熱材３とを有する場合は、野地板２と断熱材３とが接合されていることが好ましく、野地板２と断熱材３とが施工前に予め接合されていることがより好ましい。野地板２と断熱材３とが接合されていることで施工時の工数が削減される。 In the first and second embodiments, the base board 4 is composed of the sheathing board 2 and the heat insulating material 3, but the base board 4 may be composed of only the sheathing board 2. The base board 4 has fire resistance to hold the roof part against flames from below in the event of a fire and to prevent flames from blowing out from the roof, and also functions as a base flat surface for laying and fixing the waterproof sheet 6 provided on the base board 4. Therefore, the base board 4 needs to be a flat plate-like structure with fire resistance that can withstand flames. Therefore, the sheathing board 2 that constitutes the base board 4 needs to be a flat plate-like structure with fire resistance that can withstand flames.
In addition, it is preferable to have the insulating material 3 because it improves the thermal insulation. In addition, when the sheathing board 2 and the insulating material 3 are included, it is preferable that the sheathing board 2 and the insulating material 3 are joined together, and it is more preferable that the sheathing board 2 and the insulating material 3 are joined together before construction. By joining the sheathing board 2 and the insulating material 3 together, the number of steps during construction is reduced.

下地板４を構成する野地板２は、合板、OSB（Oriented StrandBord）、パーティクルボード等の木質系ボードや、木毛セメント板、硬質木毛セメント板、木毛板、木片セメント板、硬質木片セメント板等の木質系セメント板や、セメント板、スレート板、ケイカル板等の無機材料を固めた無機質板や、ガラス繊維混入樹脂板等を用いることができる。断熱材３は、硬質ウレタンフォーム、ポリスチレンフォーム、ポリエチレンフォーム、フェノールフォーム等、一般的に防水構造に使用されている断熱材を使用できる。また、グラスウールなどの無機系断熱材を使用できる。 The sheathing board 2 constituting the base board 4 can be made of wood-based boards such as plywood, OSB (Oriented Strand Board), particle board, etc.; wood-based cement boards such as wood wool cement boards, hard wood wool cement boards, wood wool boards, wood chip cement boards, hard wood chip cement boards; inorganic boards made by solidifying inorganic materials such as cement boards, slate boards, and calcium silicate boards; and glass fiber mixed resin boards. The insulation material 3 can be an insulation material generally used in waterproof structures, such as hard urethane foam, polystyrene foam, polyethylene foam, and phenol foam. Inorganic insulation materials such as glass wool can also be used.

下地板４は支持部材１の上に配置され、支持部材１にビス等（図示なし）で固定されている。また、支持部材１の上に配置された複数の下地板４は隣り合う下地板４が突き付けて配置されている。このように隣り合う下地板４が突き付けられることで目地である下地板目地部Ａが形成される。また、図６の様に下地板目地部Ａは通常、板状の下地板４を複数配置することで形成されるので、屋根の外側から平面視すると、下地板目地部Ａは格子状に形成されることが多い。この下地板目地部Ａが支持部材１の間に設けられている。 The base board 4 is placed on the support member 1 and fixed to the support member 1 with screws or the like (not shown). Furthermore, the multiple base boards 4 placed on the support member 1 are arranged so that adjacent base boards 4 are butted up against each other. By butting adjacent base boards 4 in this way, base board joint portion A, which is a joint, is formed. Furthermore, as shown in FIG. 6, base board joint portion A is usually formed by arranging multiple plate-shaped base boards 4, so when viewed from the outside of the roof in a plan view, base board joint portion A is often formed in a lattice shape. This base board joint portion A is provided between the support members 1.

第１、第２実施形態において下地板目地部Ａの上側である野地板２の上に目地被覆材５が配置されている。目地被覆材５は下地板４の下側からの炎によって下地板目地部Ａの隙間から炎が吹き出したり下地板４が炎・熱により変形し、下地板目地部Ａから炎が吹き出すのを防げればよい。
したがって、目地被覆材５は不燃材料であることが求められる。ここで不燃材料は炎や熱に対し耐久性を有する材料であり、建築基準法等で定められる不燃材料に限定されない。目地被覆材５として用いられる不燃材料としては、ステンレス等の金属製の鋼板、ガラス繊維シート、ガラス繊維織物等の無機質材を用いることができ、無機質材に有機質材を組み合わせてもよい。例えば、鋼板に熱可塑性樹脂被覆層を有する樹脂被覆鋼板、塗料被覆鋼板、薄膜アルミニウムに粘着層を設けたアルミテープ等を用いることができる。ここで、防水シート６をポリ塩化ビニル樹脂系防水シートとした場合、鋼板をポリ塩化ビニル樹脂系層で積層された塩ビ鋼板を用いることができる。さらに鋼板についてより具体的には、以下のように例示できる。一般構造用圧延鋼材(JIS G 3101)、高耐候性圧延鋼板(JIS G 3125)、冷間圧延鋼板及び鋼帯(JIS G 3141)、溶融亜鉛めっき鋼帯(JIS G 3302)、ぶりき及びぶりき原板(JIS G 3303)、電気亜鉛めっき鋼板及び鋼帯(JIS G 3313)、溶融アルミニウムめっき鋼板及び鋼帯(JIS G 3314)、ティンフリースチール(JIS G 3315)、溶融亜鉛-5%アルミニウム合金めっき鋼板(JIS G 3317)、溶融55%アルミニウム-亜鉛合金めっき鋼板及び鋼帯(JIS G 3321)、融亜鉛-アルミニウム-マグネシウム合金めっき鋼板及び鋼帯(JIS G 3323)、熱間圧延ステンレス鋼板及び鋼帯(JIS G 4304)、冷間圧延ステンレス鋼板及び鋼帯(JIS G 4305)、ポリ塩化ビニル被覆金属板(JIS K 6744)、ポリ塩化ビニル被覆鋼板(SG準拠品)、ポリ塩化ビニル片面被覆ステンレス鋼板(SUS430)。 In the first and second embodiments, a joint covering material 5 is disposed on the sheathing board 2, which is above the furring board joint portion A. The joint covering material 5 only needs to be able to prevent flames from blowing out from gaps in the furring board joint portion A due to flames from below the furring board 4, or to prevent the furring board 4 from deforming due to flames and heat, causing flames to blow out from the furring board joint portion A.
Therefore, the joint coating material 5 is required to be a non-combustible material. Here, the non-combustible material is a material that is resistant to flames and heat, and is not limited to the non-combustible material specified by the Building Standards Act and the like. As the non-combustible material used as the joint coating material 5, a metal steel plate such as stainless steel, a glass fiber sheet, a glass fiber fabric, and other inorganic materials can be used, and an organic material may be combined with the inorganic material. For example, a resin-coated steel plate having a thermoplastic resin coating layer on a steel plate, a paint-coated steel plate, an aluminum tape having an adhesive layer on a thin aluminum film, and the like can be used. Here, when the waterproof sheet 6 is a polyvinyl chloride resin-based waterproof sheet, a vinyl chloride steel plate in which a steel plate is laminated with a polyvinyl chloride resin-based layer can be used. More specifically, the steel plate can be exemplified as follows. General structural rolled steel (JIS G 3101), Highly weather-resistant rolled steel plate (JIS G 3125), Cold-rolled steel plate and strip (JIS G 3141), Hot-dip galvanized steel strip (JIS G 3302), Tinplate and tinplate base plate (JIS G 3303), Electrogalvanized steel plate and strip (JIS G 3313), Hot-dip aluminum-plated steel plate and strip (JIS G 3314), Tin-free steel (JIS G 3315), Hot-dip zinc-5% aluminum alloy-plated steel plate (JIS G 3317), Hot-dip 55% aluminum-zinc alloy-plated steel plate and strip (JIS G 3321), Hot-dip zinc-aluminum-magnesium alloy-plated steel plate and strip (JIS G 3323), Hot-rolled stainless steel plate and strip (JIS G 4304), Cold-rolled stainless steel plate and strip (JIS G 4305), Polyvinyl chloride-coated metal plate (JIS K 6744), polyvinyl chloride coated steel plate (SG compliant), polyvinyl chloride one-sided coated stainless steel plate (SUS430).

目地被覆材５は、図６に示すように一方向に長く形成された下地板目地部Ａを覆うため、細長い帯状であることが好ましく、目地被覆材５の幅に対しもう一方の辺が幅よりも長く形成されていることが好ましい。また、目地被覆材５の幅は下地板目地部Ａを充分に覆う長さであることが好ましい。目地被覆材５は下地板４に接着剤等により接着されてもよいしビス等で固定されていてもよい。 The joint covering material 5 is preferably a long, thin strip in order to cover the base board joint portion A, which is formed long in one direction as shown in FIG. 6, and it is preferable that the other side is formed longer than the width of the joint covering material 5. In addition, it is preferable that the width of the joint covering material 5 is long enough to sufficiently cover the base board joint portion A. The joint covering material 5 may be adhered to the base board 4 with an adhesive or the like, or may be fixed with screws or the like.

ここで、図５に目地被覆材５の変形例を示す。図５の目地被覆材５ａのように平板状であってもよい。平板状の目地被覆材５ａとしてはテープや帯状の鋼板を用いることができる。テープである場合、テープとして粘着層を設けることで接着剤を施工時に塗布することなくテープを下地板４に固定することができる。帯状の鋼板を用いた目地被覆材５の場合は、接着剤で下地板４に固定してもよいし、ビスを用いて固定してもよい。 Here, FIG. 5 shows a modified example of the joint covering material 5. It may be flat, like the joint covering material 5a in FIG. 5. Tape or strip-shaped steel plate can be used as the flat joint covering material 5a. In the case of tape, an adhesive layer can be provided on the tape, allowing the tape to be fixed to the base plate 4 without applying adhesive during construction. In the case of a joint covering material 5 using strip-shaped steel plate, it may be fixed to the base plate 4 with adhesive, or it may be fixed using screws.

主に目地被覆材５が鋼板で構成されている場合、目地被覆材５ｃのように鋼板の端縁部を折り曲げて折り曲げ部５３を形成し、鋼板の剛性を増し施工前や施工時の変形が低減され好ましい。 When the joint coating material 5 is mainly composed of a steel plate, it is preferable to fold the edge of the steel plate to form a folded portion 53, as in joint coating material 5c, to increase the rigidity of the steel plate and reduce deformation before and during construction.

図５に示した目地被覆材５ｅは水平片５１と固定片５４とを有し、水平片５１の両端部から下側に伸びた脚部５５を有し、水平片５１と略平行にかつ、水平片５１の両端部から外側に向けて広がった脚部５５に固定片５４が接続されている。固定片５４は下地板４に目地被覆材５を固定するために設けられており、図５に示した目地被覆材５ｅの場合、固定片５４にはビスを通すビス孔５６が設けられている。水平片５１は下地板目地部Ａを覆う部分である。図３において、目地被覆材５ｅは水平片５１が下地板目地部Ａを覆い、水平片５１から外側に向けて脚部５５によって接続された固定片５４が水平片５１から外側に向かって広がって設けられ、固定片５４は下地板４の上に配置され、固定片５４に設けられたビス孔５６にビス８が下地板４に打ち込まれ目地被覆材５ｅが下地板４に固定されている。目地被覆材５ｅは鋼板を折り曲げて水平片５１、脚部５５、固定片５５を形成することができる。 The joint coating material 5e shown in FIG. 5 has a horizontal piece 51 and a fixing piece 54, and has legs 55 extending downward from both ends of the horizontal piece 51, and the fixing piece 54 is connected to the legs 55 that are approximately parallel to the horizontal piece 51 and spread outward from both ends of the horizontal piece 51. The fixing piece 54 is provided to fix the joint coating material 5 to the base board 4, and in the case of the joint coating material 5e shown in FIG. 5, the fixing piece 54 has a screw hole 56 for passing a screw. The horizontal piece 51 is a part that covers the base board joint part A. In FIG. 3, the joint coating material 5e has a horizontal piece 51 that covers the base board joint part A, and the fixing piece 54 connected by the leg part 55 to the horizontal piece 51 spreads outward from the horizontal piece 51, and the fixing piece 54 is placed on the base board 4, and the screw 8 is driven into the screw hole 56 provided in the fixing piece 54 to fix the joint coating material 5e to the base board 4. The joint covering material 5e can be made by bending a steel plate to form a horizontal piece 51, a leg 55, and a fixing piece 55.

この様に目地被覆材５ｅをビス８で固定する場合、ビス８は下地板目地部Ａの近傍から離して下地板４に打ち込むことが好ましく、図３のように下地板目地部Ａを挟んで両側にビス８を打ち込むことが好ましい。下地板目地部Ａは下からの炎に対し弱い部分であり、下地板４が変形し下地板目地部Ａが開いた場合には目地被覆材５が浮いたり脱離したりすることが懸念され、ビス８を下地板目地部Ａから離れた部分に下地板目地部Ａを挟んで打ち込むことでこのような懸念を低減することができる。
また、目地被覆材５として一定の厚みを設けることが好ましい。この様に目地被覆材５に厚みを設けることで、目地被覆材５をビス８で固定する場合のビス８で打ち込む際の座繰りを形成しやすくなる。目地被覆材５ｃ、５ｅのように一定の厚みを設ける手段としては目地被覆材５を構成する材料の厚みを厚くしたり、折り曲げたりして目地被覆材５に厚みをもたせる方法が例示できる。 When fixing the joint coating material 5e with screws 8 in this manner, it is preferable to drive the screws 8 into the base board 4 away from the vicinity of the furring board joint portion A, and it is preferable to drive the screws 8 on both sides of the furring board joint portion A as shown in Figure 3. The furring board joint portion A is a weak area against flames from below, and if the furring board 4 deforms and the furring board joint portion A opens, there is a concern that the joint coating material 5 will float or come off; by driving the screws 8 into a portion away from the furring board joint portion A, with the furring board joint portion A in between, this concern can be reduced.
It is also preferable to provide a constant thickness for the joint covering material 5. Providing a thickness for the joint covering material 5 in this manner makes it easier to form a countersink when driving in the screws 8 to fix the joint covering material 5 with the screws 8. Examples of means for providing a constant thickness like the joint covering materials 5c and 5e include a method of thickening the material that constitutes the joint covering material 5 or bending it to provide thickness to the joint covering material 5.

また図５の目地被覆材５ｂ、５ｄのように水平片５１と凸状片５２で構成され断面において略Ｔ字形としてもよい。目地被覆材５ｂは水平片５１から下側に向けて凸状片５２が設けられている。目地被覆材５ｄは、１枚の鋼板を折り曲げて凸状片５２が鋼板を二重にして形成されている。
水平片５１は下地板目地部Ａの下地板４の上面に配置され下地板目地部Ａの上面を覆い、凸状片５２は下地板目地部Ａの下側に向けて隣り合う下地板４の間に挿入されている。ここで下地板４は下からの炎により加熱され変形し下地板目地部Ａが広がるおそれがあり、凸状片５２を有することで下地板目地部Ａから目地被覆材５が脱離しにくくなり下地板目地部Ａからの炎の噴出をより防止することができるため好ましい。 5, the joint covering material 5b and 5d may be configured with a horizontal piece 51 and a convex piece 52, and have a generally T-shaped cross section. The joint covering material 5b has a convex piece 52 extending downward from the horizontal piece 51. The joint covering material 5d is formed by bending a single steel plate so that the convex piece 52 is doubled.
The horizontal piece 51 is placed on the upper surface of the furring board 4 in the furring board joint portion A and covers the upper surface of the furring board joint portion A, and the convex piece 52 is inserted between adjacent furring boards 4 toward the lower side of the furring board joint portion A. Here, the furring board 4 may be heated and deformed by the flame from below, which may cause the furring board joint portion A to spread, so having the convex piece 52 makes it difficult for the joint covering material 5 to detach from the furring board joint portion A, which is preferable because it makes it possible to better prevent flames from escaping from the furring board joint portion A.

また、目地被覆材５ｄは凸状片５２が鋼板を二重にして形成されているため、火災時に熱や炎によって下地板４が収縮し下地板目地部Ａが広がる場合に、目地被覆材５が図３のようにビスで両端縁部が固定されていると、その収縮に合わせて二重となった凸状片５２が伸びて下地板目地部Ａが上側から見て露出するのを防ぎ、広がった下地板目地部Ａから炎が噴き出すことを防止することができる。 In addition, because the convex piece 52 of the joint coating material 5d is formed by doubling the steel plate, if the heat or flames of a fire cause the base plate 4 to shrink and the base plate joint portion A to expand, if the joint coating material 5 is fixed at both ends with screws as shown in Figure 3, the double convex piece 52 will expand in accordance with the shrinkage, preventing the base plate joint portion A from being exposed when viewed from above, and preventing flames from erupting from the expanded base plate joint portion A.

実施形態の変形例として、図２、図３のように目地被覆材５と下地板４との間に不燃充填材７を充填させもよい。不燃充填材７は不燃材料で構成されていればよい。ここで不燃材料は炎に対し耐久性を有する材料であり、建築基準法等で定められる不燃材料に限定されない。不燃充填材７は下地板目地部Ａの隙間から炎が吹き上がるのをより効果的に防止するために目地被覆材５と下地板４との間に充填される材料であって、目地被覆材５と下地板４とに密着されることが好ましく、不燃材料であって柔軟性や追従性を有することが好ましい。不燃充填材７はガラス繊維、金属繊維、炭素繊維等の無機質繊維や変性シリコーン樹脂系やポリウレタン樹脂系、シリコーン等の難燃シーリング材を用いることができる。
図２や図３のように目地被覆材５を折り曲げた鋼板で構成した目地被覆材５ｅとした場合、目地被覆材５ｅと下地板４とで形成された隙間に不燃充填材７を充填させることができる。目地被覆材５ｅと下地板４とで形成された隙間に不燃充填材７を充填させ隙間を完全にふさぐことが好ましいが、図２や図３のように一部隙間が存在していてもよい。 As a modification of the embodiment, a non-combustible filler 7 may be filled between the joint coating material 5 and the base plate 4 as shown in Figs. 2 and 3. The non-combustible filler 7 may be made of a non-combustible material. The non-combustible material is a material that is resistant to flames and is not limited to non-combustible materials as defined by the Building Standards Act and the like. The non-combustible filler 7 is a material that is filled between the joint coating material 5 and the base plate 4 in order to more effectively prevent flames from rising from the gaps in the joints A of the base plate, and is preferably in close contact with the joint coating material 5 and the base plate 4, and is preferably a non-combustible material that has flexibility and conformability. The non-combustible filler 7 may be inorganic fibers such as glass fibers, metal fibers, and carbon fibers, or flame-retardant sealants such as modified silicone resins, polyurethane resins, and silicones.
When the joint covering material 5 is a joint covering material 5e made of a folded steel plate as shown in Figures 2 and 3, the noncombustible filler 7 can be filled into the gap formed between the joint covering material 5e and the base plate 4. It is preferable to fill the gap formed between the joint covering material 5e and the base plate 4 with the noncombustible filler 7 to completely seal the gap, but it is also acceptable for some gaps to exist as shown in Figures 2 and 3.

また、目地被覆材５は複数の材を組み合わせて用いてもよい。図示しないが、下地板目地部Ａを覆い下地板４の上に１つ目の第１目地被覆材を固定し、第１目地被覆材の上から２つ目の第２目地被覆材を配置固定してもよい。例えば、第１目地被覆材としてアルミテープを下地板４の上に貼り付け、その上から第２目地被覆材として鋼板を被せ固定してもよい。逆に、第１目地被覆材として鋼板を下地板４の上に配置固定し、その上から第２目地被覆材としてアルミテープを覆うように貼り付けてもよい。また、第１目地被覆材、第２目地被覆材の上から第３目地被覆材を被せてもよい。さらに、不燃充填材７を第１目地被覆材と下地板４との間に充填してもよいし、不燃充填材７と同種の材料を複数の目地被覆材の間に充填してもよい。 In addition, the joint coating material 5 may be a combination of multiple materials. Although not shown, a first joint coating material may be fixed on the base plate 4 to cover the joint portion A of the base plate, and a second joint coating material may be placed and fixed on top of the first joint coating material. For example, aluminum tape may be attached to the base plate 4 as the first joint coating material, and a steel plate may be placed and fixed on top of it as the second joint coating material. Conversely, a steel plate may be placed and fixed on the base plate 4 as the first joint coating material, and an aluminum tape may be attached on top of it as the second joint coating material so as to cover it. In addition, a third joint coating material may be placed on top of the first joint coating material and the second joint coating material. Furthermore, a non-combustible filler 7 may be filled between the first joint coating material and the base plate 4, or the same type of material as the non-combustible filler 7 may be filled between multiple joint coating materials.

目地被覆材５と下地板４の上には防水シートが敷設され、少なくとも下地板４に対して固定されている。
防水シート６としては、ポリ塩化ビニル樹脂系、加硫ゴム系、非加硫ゴム系、熱可塑性エラストマー系、エチレン酢酸ビニル樹脂系等、熱可塑性樹脂層を有する一般的な防水シートが使用できる。施工性、重ねあわせ部分の接合性に優れるためポリ塩化ビニル樹脂系防水シートを用いることが好ましい。
防水シート６は熱可塑性樹脂層の単層でもよいが、寸法安定性、引張強度に優れるという点からガラスクロス、ガラス不織布、ポリエステルクロス、ポリエステル不織布等の基材層を積層した複層品が好ましい。基材層は最下層に設けてもよいが熱可塑性樹脂層の中間に設けてもよい。また熱可塑性樹脂層は一層であっても、複数の層であってもよく、それぞれの層の組成を異なるものとしてもよい。
防水シート６の防火性が向上するとの点から、熱可塑性樹脂層の中間にガラス不織布層を設けた構成とすることが好ましい。 A waterproof sheet is laid on the joint covering material 5 and the base plate 4 and is fixed to at least the base plate 4.
As the waterproof sheet 6, a general waterproof sheet having a thermoplastic resin layer, such as polyvinyl chloride resin, vulcanized rubber, non-vulcanized rubber, thermoplastic elastomer, ethylene vinyl acetate resin, etc., can be used. It is preferable to use a polyvinyl chloride resin waterproof sheet because of its excellent workability and bonding properties at overlapping parts.
The waterproof sheet 6 may be a single layer of thermoplastic resin, but a multi-layer product in which a base layer such as glass cloth, glass nonwoven fabric, polyester cloth, or polyester nonwoven fabric is laminated is preferable in terms of excellent dimensional stability and tensile strength. The base layer may be provided as the bottom layer, or may be provided between the thermoplastic resin layers. The thermoplastic resin layer may be a single layer or multiple layers, and each layer may have a different composition.
From the viewpoint of improving the fire resistance of the waterproof sheet 6, it is preferable to provide a glass nonwoven fabric layer between the thermoplastic resin layers.

防水シート６は難燃性を有する難燃性防水シートを用いることでより防火性が向上するために好ましい。難燃性防水シートは熱可塑性樹脂製層に難燃剤を用いることで得られるまた、防水シート６の表層に難燃性の処理剤や塗料を塗布しても良い。熱可塑性樹脂層に用いる難燃剤としては、有機難燃剤としてハロゲン系難燃剤、リン系難燃剤、シリコーン系難燃剤、無機系難燃剤として金属水酸化物、アンチモン系難燃剤を用いることができる。リン系難燃剤としては可塑剤としても機能するＴＣＰ、ＴＸＰ等のリン系可塑剤が例示され、金属水酸化物としては、水酸化マグネシウムや水酸化アルミニウムなどが例示され、アンチモン系としては三酸化アンチモンが例示できる。防水シート６をポリ塩化ビニル樹脂系防水シートする場合、三酸化アンチモンなどのアンチモン系やＴＣＰ、ＴＸＰ等のリン系難燃剤、水酸化マグネシウムや水酸化アルミニウムなどの金属水酸化物が好適に用いられる。また、ポリ塩化ビニル樹脂系防水シートを２層で構成する場合には、両方の層に難燃剤を添加しても良いし、表面層か裏面層のいずれか一方の層に添加してもよい。
より具体的には、表面層はポリ塩化ビニル樹脂１００重量部に対し可塑剤としてＤＩＮＰを４０～７０重量部、充填剤として炭酸カルシウム５～４０重量部とし、裏面層はポリ塩化ビニル樹脂１００重量部に対し可塑剤としてＤＩＮＰを５０～８０重量部、充填剤として炭酸カルシウム２０～８０重量部とし、裏面層と表面層表面層または裏面層に難燃剤として三酸化アンチモン２～２０重量部を添加しても良いし、表面層と裏面層の両方の層にそれぞれ難燃剤として三酸化アンチモン２～２０重量部を添加しても良い。さらに、表面層と裏面層との間にガラス不織布を用いる構成とすることが防火性の向上との点でより好ましい。 The waterproof sheet 6 is preferably a flame-retardant waterproof sheet having flame retardancy, since it has improved fire resistance. The flame-retardant waterproof sheet can be obtained by using a flame retardant in the thermoplastic resin layer. In addition, a flame-retardant treatment agent or paint may be applied to the surface layer of the waterproof sheet 6. As the flame retardant used in the thermoplastic resin layer, a halogen-based flame retardant, a phosphorus-based flame retardant, or a silicone-based flame retardant can be used as an organic flame retardant, and a metal hydroxide or an antimony-based flame retardant can be used as an inorganic flame retardant. Examples of the phosphorus-based flame retardant include phosphorus-based plasticizers such as TCP and TXP, which also function as plasticizers, and examples of the metal hydroxides include magnesium hydroxide and aluminum hydroxide, and examples of the antimony-based flame retardants include antimony trioxide. When the waterproof sheet 6 is a polyvinyl chloride resin-based waterproof sheet, antimony-based flame retardants such as antimony trioxide, phosphorus-based flame retardants such as TCP and TXP, and metal hydroxides such as magnesium hydroxide and aluminum hydroxide are preferably used. Furthermore, when the polyvinyl chloride resin waterproof sheet is constructed of two layers, the flame retardant may be added to both layers, or to either the front layer or the back layer.
More specifically, the surface layer contains 40 to 70 parts by weight of DINP as a plasticizer and 5 to 40 parts by weight of calcium carbonate as a filler relative to 100 parts by weight of polyvinyl chloride resin, the back layer contains 50 to 80 parts by weight of DINP as a plasticizer and 20 to 80 parts by weight of calcium carbonate as a filler relative to 100 parts by weight of polyvinyl chloride resin, and 2 to 20 parts by weight of antimony trioxide may be added as a flame retardant to the back layer or the front layer, or 2 to 20 parts by weight of antimony trioxide may be added as a flame retardant to both the front layer and the back layer. Furthermore, it is more preferable to use a glass nonwoven fabric between the front layer and the back layer in terms of improving fire resistance.

防水シート６の下地板４への固定方法は、固定用ビスと固定用ディスクを用いる機械固定方法であってよいし、接着剤を用いる接着工法であってもよい。
防水シート６としてポリ塩化ビニル樹脂系防水シートを用い、機械的固定工法とする場合は、ポリ塩化ビニル樹脂系防水シートを下地板４の上に敷設しその上から固定用ディスクを配置し固定用ビスを打ち込みポリ塩化ビニル樹脂系防水シートを固定用ディスクで固定してもよいし、下地板４の上に固定用ディスクを配置し固定用ビスで下地板４に固定し、固定用ディスクの上からポリ塩化ビニル樹脂系防水シートを敷設し固定用ディスクの上面に設けられた接合剤によってポリ塩化ビニル樹脂系防水シートと固定用ディスクとを固定してもよい。 The method of fixing the waterproof sheet 6 to the base plate 4 may be a mechanical fixing method using fixing screws and fixing disks, or an adhesive method using an adhesive.
When a polyvinyl chloride resin-based waterproof sheet is used as the waterproof sheet 6 and a mechanical fixing method is used, the polyvinyl chloride resin-based waterproof sheet may be laid on the base board 4, a fixing disk may be placed on top of it, and fixing screws may be driven in to fix the polyvinyl chloride resin-based waterproof sheet with the fixing disk, or a fixing disk may be placed on the base board 4 and fixed to the base board 4 with fixing screws, the polyvinyl chloride resin-based waterproof sheet may be laid on top of the fixing disk, and the polyvinyl chloride resin-based waterproof sheet and the fixing disk may be fixed together with an adhesive applied to the upper surface of the fixing disk.

また、防水シート６を接着工法で固定する場合の接着剤としては、エポキシ系、ＮＢＲ（ニトリルゴム）系、ＳＢＲ（スチレン-ブタジエンゴム）系、ウレタン系、アクリル系等が挙げられる。ポリ塩化ビニル樹脂系防水シートを用いる場合、ニトリルゴム系接着剤を用いることが好ましい。接着剤は、防水シート６と下地板４の両面に塗布してもよいし、どちらか一方の面に塗布してもよい。 Additionally, when the waterproof sheet 6 is fixed by an adhesive method, examples of adhesives include epoxy-based, NBR (nitrile rubber)-based, SBR (styrene-butadiene rubber)-based, urethane-based, and acrylic-based adhesives. When using a polyvinyl chloride resin-based waterproof sheet, it is preferable to use a nitrile rubber-based adhesive. The adhesive may be applied to both sides of the waterproof sheet 6 and the base board 4, or to just one side.

ここで、隣り合う防水シート６は重ね合わせを行いその重ねあわせ部の接合は、溶剤による溶着や熱による融着が好ましく、このような溶融着による接合は接着剤を介しての接着よりも接合強度の経時での安定性に優れるため好ましい。溶剤による溶着で用いる溶剤は、防水シート６を構成する樹脂の良溶媒が好ましい。例えば防水シート６がポリ塩化ビニル樹脂系防水シートである場合、主成分としてＴＨＦを用いることが好ましい。 Here, adjacent waterproof sheets 6 are overlapped and the overlapping portions are preferably joined by solvent welding or heat fusion, and such joining by fusion is preferred because it provides superior stability of the joining strength over time compared to adhesion using an adhesive. The solvent used for solvent welding is preferably a good solvent for the resin that constitutes the waterproof sheet 6. For example, if the waterproof sheet 6 is a polyvinyl chloride resin-based waterproof sheet, it is preferable to use THF as the main component.

また、下地板目地部Ａの上で防水シート６を重ね合わせ、下地板目地部Ａと防水シート６の重ね合わせ部がおよそ同じ位置に配置されていてもよい。 The waterproof sheet 6 may also be overlapped on top of the base board joint portion A, with the overlapping portion of the base board joint portion A and the waterproof sheet 6 positioned at approximately the same position.

支持部材は鉄骨や木材を用いることができ、鉄骨を用いることでより大型な建築物の構築が可能となり好ましい。また、鉄骨を用いた大型構築物において、本発明を用いることで屋根の傾斜を小さくしかつ防水性能と防火性能を保持することが可能となり好ましい。 The support members can be made of steel or wood, and using steel is preferable because it allows for the construction of larger buildings. In addition, in large structures using steel frames, the present invention is preferable because it allows the roof slope to be reduced while maintaining waterproofing and fire resistance.

本発明においては、下地板４のほかに別の板状部材を防水性と防火性を損なわない範囲で積層してもよい。板状部材は断熱材や補強板を用いることが出来る。断熱材としては、硬質ウレタンフォーム、ポリスチレンフォーム、ポリエチレンフォーム等、一般的に防水構造に使用されている断熱材を使用できる。補強板としては、セメント板、合板、無機質材を樹脂で固定化したケイカル板等の無機質板等が挙げられる。 In the present invention, in addition to the base board 4, another plate-like member may be laminated to the extent that waterproofing and fire resistance are not impaired. The plate-like member may be an insulating material or a reinforcing plate. As the insulating material, a rigid urethane foam, polystyrene foam, polyethylene foam, or other insulating material generally used in waterproof structures may be used. As the reinforcing plate, an inorganic board such as a cement board, plywood, or a calcium silicate board in which inorganic material is fixed with resin may be used.

実施形態において用いられるビスは、ビス以外に一般的にネジ、ボルト、釘等を用いてもよい。材質としては、炭素鋼、合金鋼、ステンレス鋼等の鋼材などが使用できる。 In the embodiment, the screws used may be screws, bolts, nails, etc. in general. Materials that can be used include steel materials such as carbon steel, alloy steel, and stainless steel.

第１実施形態の施工方法について図１を用いて説明する。
鉄骨で構成された支持部材１の上に下地板４を配置し、ビス８（図示なし）で支持架台１に固定する。下地板４は野地板２と断熱材３とので構成され、施工前に予め野地板２と断熱材３とを積層し接合一体化されている。なお野地板２の面が上側で断熱材３の面が下側に向けて配置している。そして下地板４は図１では２枚で構成され、隣り合う下地板４を突き付けて配置し、その突きつけた部分である下地板目地部Ａに、不燃材料で構成されたテープである目地被覆材５ａの粘着層を下地板４側にして貼り付ける。目地被覆材５ａは下地板目地部Ａを覆うように貼り付ける。次に、目地被覆材５と下地板４の上にＮＢＲ系接着剤を塗布し、防水シート６を接着剤の上に敷設し、固定する。 The construction method of the first embodiment will be described with reference to FIG.
A base plate 4 is placed on a support member 1 made of steel and fixed to the support frame 1 with screws 8 (not shown). The base plate 4 is composed of a sheathing board 2 and a heat insulating material 3, and the sheathing board 2 and the heat insulating material 3 are laminated and joined together before construction. The surface of the sheathing board 2 is placed on the upper side and the surface of the heat insulating material 3 is placed on the lower side. In FIG. 1, the base plate 4 is composed of two sheets, and adjacent base plates 4 are placed against each other, and the adhesive layer of the joint coating material 5a, which is a tape made of a non-combustible material, is attached to the base plate 4 side at the joint portion A of the sheathing board, which is the part where they are butted. The joint coating material 5a is attached so as to cover the joint portion A of the sheathing board. Next, NBR-based adhesive is applied to the joint coating material 5 and the base plate 4, and a waterproof sheet 6 is laid on the adhesive and fixed.

第２実施形態の施工方法について図３を用いて説明する。第２実施形態は目地被覆材５として鋼板を用いている。
支持部材１の上に下地板４を配置し、ビス８（図示なし）で支持架台１に固定する。下地板４は野地板２と断熱材３とで構成され、施工前に予め野地板２と断熱材３とを積層し接合一体化されている。なお野地板２の面が上側で断熱材３の面が下側に向けて配置している。そして下地板４は図３では２枚で構成され、隣り合う下地板４を突き付けて配置し、その突きつけた部分である下地板目地部Ａの上には鋼板を折り曲げた帯状の目地被覆材５ｅが配置され、目地被覆材５ｅの両端縁部にビス８が打ち込まれ固定されている。目地被覆材５ｅと下地板４の上を覆って防水シート６が下地板４にＮＢＲ系接着剤で固定されている。 The construction method of the second embodiment will be described with reference to Fig. 3. In the second embodiment, a steel plate is used as the joint covering material 5.
A base plate 4 is placed on the support member 1 and fixed to the support frame 1 with screws 8 (not shown). The base plate 4 is composed of a sheathing board 2 and a heat insulating material 3, and the sheathing board 2 and the heat insulating material 3 are laminated and joined together before construction. The surface of the sheathing board 2 is placed on the upper side and the surface of the heat insulating material 3 is placed on the lower side. In FIG. 3, the base plate 4 is composed of two sheets, and adjacent base plates 4 are placed against each other, and a belt-shaped joint coating material 5e made of folded steel plate is placed on the joint part A of the sheathing board, which is the part where they are butted, and screws 8 are driven into both end parts of the joint coating material 5e to fix it. A waterproof sheet 6 is fixed to the base plate 4 with an NBR-based adhesive, covering the joint coating material 5e and the base plate 4.

以下に、本発明の実施例について説明する。
「実施例１」
実施例１を図１を用いて以下に説明する。鉄骨で構成された支持部材１の上に下地板４が配置され、ビス（図示なし）で支持部材１に固定されている。下地板４は野地板２として木毛セメント板と断熱材３としてフェノールフォームとで構成され、施工前に予め野地板２と断熱材３とを積層し接合一体化されている。なお野地板２の面が上側で断熱材３の面が下側に向けて配置されている。そして下地板４は２枚で構成され、隣り合う下地板４は突き付けて配置され、その突きつけた部分である下地板目地部Ａに、不燃材料で構成されたテープである目地被覆材５ａとしてアルミテープの粘着層を下地板４側にして貼り付けられる。目地被覆材５は下地板目地部Ａを覆うように貼り付けられる。次に、目地被覆材５と下地板４の上にＮＢＲ系接着剤が塗布され、防水シート６としてポリ塩化ビニル樹脂系防水シートがＮＢＲ系接着剤の上に敷設固定されている。 Examples of the present invention will be described below.
"Example 1"
Example 1 will be described below with reference to FIG. 1. A base plate 4 is placed on a support member 1 made of steel and fixed to the support member 1 with screws (not shown). The base plate 4 is composed of a cemented wood board as a sheathing board 2 and a phenol foam as a heat insulating material 3, and the sheathing board 2 and the heat insulating material 3 are laminated and joined together before construction. The surface of the sheathing board 2 is placed on the upper side and the surface of the heat insulating material 3 is placed on the lower side. The base plate 4 is composed of two sheets, and adjacent base plates 4 are placed against each other, and a joint coating material 5a, which is a tape made of a non-combustible material, is attached to the base plate joint part A, which is the part where they are butted, with the adhesive layer of an aluminum tape on the base plate 4 side. The joint coating material 5 is attached so as to cover the base plate joint part A. Next, an NBR-based adhesive is applied on the joint coating material 5 and the base plate 4, and a polyvinyl chloride resin-based waterproof sheet is laid and fixed on the NBR-based adhesive as a waterproof sheet 6.

「実施例２」
実施例２について図３を用いて説明する。
鉄骨で構成された支持部材１の上に下地板４が配置され、ビス（図示なし）で支持部材１に固定される。下地板４は野地板２として木毛セメント板と断熱材３としてフェノールフォームとので構成され、施工前に予め野地板２と断熱材３とを積層し接合一体化されている。なお野地板２の面が上側で断熱材３の面が下側に向けて配置されている。そして下地板４は２枚で構成され、隣り合う下地板４は突き付けて配置され、その突きつけた部分である下地板目地部Ａに、目地被覆材５ｅとしてポリ塩化ビニル樹脂で被覆した鋼板が用いられる。目地被覆材５ｅは細長い帯状の鋼板を折り曲げて形成され、水平片５１と固定片５４とが脚部５５で接続されている。固定片５４に設けられたビス孔５６にビス８を下地板４の野地板２に向けて打ち込まれ、目地被覆材５ｅが下地板４に固定される。目地被覆材５ｅと下地板４の間に不燃充填材７として、変性シリコーン樹脂系シーリング材が充填されている。不燃充填材７はガラス繊維クロスを充填してもよい。目地被覆材５ｅと下地板４の上にＮＢＲ系接着剤が塗布され、防水シート６としてポリ塩化ビニル樹脂系防水シートがＮＢＲ系接着剤の上に敷設固定されている。 "Example 2"
The second embodiment will be described with reference to FIG.
A base plate 4 is placed on a support member 1 made of a steel frame, and is fixed to the support member 1 with screws (not shown). The base plate 4 is composed of a cement board as a sheathing board 2 and a phenol foam as a heat insulating material 3, and the sheathing board 2 and the heat insulating material 3 are laminated and joined together before construction. The surface of the sheathing board 2 is placed on the upper side, and the surface of the heat insulating material 3 is placed on the lower side. The base plate 4 is composed of two sheets, and adjacent base plates 4 are placed in contact with each other, and a steel plate coated with polyvinyl chloride resin is used as a joint coating material 5e for the joint part A of the sheathing board, which is the part where they are butted. The joint coating material 5e is formed by bending a long and thin strip-shaped steel plate, and the horizontal piece 51 and the fixing piece 54 are connected by a leg 55. A screw 8 is driven into a screw hole 56 provided in the fixing piece 54 toward the sheathing board 2 of the base plate 4, and the joint coating material 5e is fixed to the base plate 4. A modified silicone resin-based sealant is filled between the joint covering material 5e and the base plate 4 as a non-combustible filler 7. Glass fiber cloth may be filled as the non-combustible filler 7. An NBR-based adhesive is applied onto the joint covering material 5e and the base plate 4, and a polyvinyl chloride resin-based waterproof sheet is laid and fixed on the NBR-based adhesive as a waterproof sheet 6.

「実施例３」
実施例３について図４を用いて説明する。鉄骨で構成された支持部材１の上に下地板４が配置され、ビス（図示なし）で支持部材１に固定されている。下地板４は野地板２として木毛セメント板と断熱材３としてフェノールフォームとで構成され、施工前に予め野地板２と断熱材３とを積層し接合一体化されている。なお野地板２の面が上側で断熱材３の面が下側に向けて配置されている。そして下地板４は２枚で構成され、隣り合う下地板４が突き付けて配置され、その突きつけた部分である下地板目地部Ａに、目地被覆材５ｄとして鋼板を折り曲げた帯状のポリ塩化ビニル被覆鋼板が配置され、目地被覆材５ｄの両端縁部にビス８が打ち込まれ固定されている。目地被覆材５ｄは水平片５１と凸状片５２とを有し、水平片５１が下地板目地部Ａを覆い、凸状片５２が隣り合う下地板４がつき合わされた目地部分に挿入されている。目地被覆材５ｄと下地板４の上を覆って防水シート６としてポリ塩化ビニル樹脂系防水シートが下地板４にＮＢＲ系接着剤で固定されている。 "Example 3"
Example 3 will be described with reference to Fig. 4. A base plate 4 is placed on a support member 1 made of steel and fixed to the support member 1 with screws (not shown). The base plate 4 is composed of a cemented wood board as the sheathing board 2 and a phenol foam as the heat insulating material 3, and the sheathing board 2 and the heat insulating material 3 are laminated and joined together before construction. The surface of the sheathing board 2 is placed on the upper side and the surface of the heat insulating material 3 is placed on the lower side. The base plate 4 is composed of two sheets, and adjacent base plates 4 are placed against each other, and a belt-shaped polyvinyl chloride-coated steel plate made by bending a steel plate is placed in the sheathing board joint part A, which is the part where they are butted, as a joint covering material 5d, and screws 8 are driven into both end parts of the joint covering material 5d. The joint covering material 5d has a horizontal piece 51 and a convex piece 52, and the horizontal piece 51 covers the sheathing board joint part A, and the convex piece 52 is inserted into the joint part where the adjacent base plates 4 are butted together. A polyvinyl chloride resin-based waterproof sheet 6 covers the joint covering material 5d and the base board 4 and is fixed to the base board 4 with an NBR-based adhesive.

本発明のシート防水構造は主に木造や鉄骨造の屋根に用いることができる。特に大型の構築部の屋根に好適に用いることができる。 The waterproof sheet structure of the present invention can be used primarily on wooden or steel-framed roofs. It is particularly suitable for use on the roofs of large structures.

１支持部材
２野地板
３断熱材
４下地板
５目地被覆材
５１水平片
５２凸状片
５３折り曲げ部
５４固定片
５５脚部
５６ビス孔
６防水シート
７不燃充填材
８ビス REFERENCE SIGNS LIST 1 Support member 2 Roof board 3 Insulation material 4 Base board 5 Joint covering material 51 Horizontal piece 52 Convex piece 53 Bending portion 54 Fixing piece 55 Leg 56 Screw hole 6 Waterproof sheet 7 Non-combustible filling material 8 Screw

Claims

A plurality of base plates are arranged and fixed against a support member made of a plurality of steel frames arranged in parallel at intervals to form a roof;
a joint covering material that is a tape made of a non-combustible material and is bonded to the base board only on the upper side of the base board joint portion that is approximately perpendicular to the support member at the joint formed by butting the adjacent base boards together;
A waterproof sheet is laid and fixed on the base plate and the joint covering material,
A sheet waterproofing structure, wherein the base board is made of a heat insulating material and a sheathing board laminated with the heat insulating material, and the sheathing board is any one of a wood board, a wood cement board, an inorganic board, and a glass fiber mixed resin board.

The sheet waterproof structure according to claim 1, in which the heat insulating material is disposed on the support member side and the waterproof sheet is fixed to the sheathing board side.

The sheet waterproof structure according to claim 1 or claim 2, wherein the insulating material is phenol foam.

The sheet waterproofing structure according to any one of claims 1 to 3, wherein the joint covering material is aluminum tape.

The sheet waterproofing structure according to any one of claims 1 to 4, wherein the base board joint portion, which is approximately perpendicular to the support member , is provided between a plurality of the support members.

The sheet waterproofing structure according to any one of claims 1 to 5, further comprising a non-combustible filler filled between the joint covering material and the base plate.

The sheet waterproof structure according to any one of claims 1 to 6, wherein the waterproof sheet has a thermoplastic resin layer and a glass nonwoven fabric layer, and the thermoplastic resin layer is laminated on the upper and lower surfaces of the glass nonwoven fabric layer.

A sheet waterproof structure according to any one of claims 1 to 7, in which the waterproof sheet is adhered to the base plate with an adhesive.

A process of laying a plurality of base plates on a support member composed of a plurality of steel frames arranged in parallel at intervals to form a roof, butting the plurality of base plates together to form base plate joints, and fixing the base plates to the support member;
A step of covering only the upper side of the furring board joint portion , which is approximately perpendicular to the support member, with a joint covering material that is a tape made of a non-combustible material;
A step of laying and fixing a waterproof sheet on the base plate and the joint covering material,
The method for constructing a sheet waterproofing structure, wherein the base board is made of an insulating material and a sheathing board laminated with the insulating material, and the sheathing board is any one of a wood-based board, a wood-based cement board, an inorganic board, and a glass fiber mixed resin board.