JP2008050895A

JP2008050895A - Joining structure and joining method of waterproof sheet

Info

Publication number: JP2008050895A
Application number: JP2006230033A
Authority: JP
Inventors: Toshiaki Takahashi; 俊昭高橋; Shoji Shibata; 昇次柴田; Kunifumi Ougihata; 邦史扇畑; Akihiro Mannaka; 明浩真中
Original assignee: Fujimori Kogyo Co Ltd; Fujimori Sangyo Co Ltd
Current assignee: Fujimori Kogyo Co Ltd; Fujimori Sangyo Co Ltd
Priority date: 2006-08-28
Filing date: 2006-08-28
Publication date: 2008-03-06
Anticipated expiration: 2026-08-28
Also published as: JP4840583B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining structure and a joining method of a waterproof sheet capable of easily and surely joining a part difficult to be joined by a conventionally used automatic welder, in the joining structure and the joining method of the waterproof sheet used for constructing a tunnel. <P>SOLUTION: This joining structure of the waterproof sheet is characterized by joining mutual side ends of a plurality of water impermeable sheets by a joining sheet composed of a thermoplastic resin layer thermally fusible on at least the water impermeable sheets and a heat resistant layer having a melting point higher than this resin layer. The joining method of the waterproof sheet joins the waterproof sheet by thermally fusing a thermoplastic resin of the joining sheet on the mutual side ends of the plurality of water impermeable sheets, by heating and pressuring the sheet from the heat resistant layer side, by oppositely superposing the thermoplastic resin layer side of the joining sheet on a superposed part or an approached part, by superposing or approaching the mutual side ends of the plurality of water impermeable sheets, and by applying its joining structure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、トンネル等の施工に用いる防水シートの接合構造及び接合方法に関する。 The present invention relates to a joining structure and joining method for waterproof sheets used for construction of tunnels and the like.

従来、ＮＡＴＭ工法に見られるように、トンネルの一次覆工コンクリートと二次覆工コンクリートとの間に防水シートを介装し、一次覆工コンクリート側からの湧水が二次覆工コンクリート側に漏水するのを防止することが行われている。
一般に、この防水シートは、透水性シートと不透水性シートとからなり、該透水性シート側を一次覆工コンクリート側に、該不透水性シート側を二次覆工コンクリート側になるよう介装することにより、地山からの湧水を該透水性シートによってトンネル外に導出すると共に、該不透水性シートによって二次覆工コンクリート側への漏水を防止している。従って、当該施工にあたっては、防水シートによる二次覆工コンクリートに対する一次覆工コンクリートの液密な展張作業が必須となる。
防水シートの展張作業にあたっては、防水シート面積に対して、展張面積が非常に大きいため、複数の防水シートを接合しながら展張することが前提となり、従来、この接合は、自動溶接機を用いた融着・接合がなされている。 Conventionally, as seen in the NATM method, a waterproof sheet is interposed between the primary lining concrete of the tunnel and the secondary lining concrete, and the spring water from the primary lining concrete side is on the secondary lining concrete side. Prevention of water leakage is being carried out.
Generally, this waterproof sheet is composed of a water-permeable sheet and a water-impermeable sheet, and the water-permeable sheet side is disposed on the primary lining concrete side, and the water-permeable sheet side is disposed on the secondary lining concrete side. As a result, spring water from the natural ground is led out of the tunnel by the water-permeable sheet, and water leakage to the secondary lining concrete side is prevented by the water-impermeable sheet. Therefore, in the construction, a liquid-tight extension work of the primary lining concrete with respect to the secondary lining concrete by the waterproof sheet is essential.
In the expansion work of the waterproof sheet, since the expanded area is very large relative to the area of the waterproof sheet, it is assumed that a plurality of waterproof sheets are bonded while being bonded. Conventionally, this bonding was performed using an automatic welding machine. It is fused and joined.

特開平７−１１３３９９号公報（特許文献１）には、熱融着性の防水シートを屋根瓦状に重ね合わせて施工箇所に張り、その重ね合わせた部位を専用の自動溶接機の該部位長さ方向への移動の下、該溶接機の熱ごてによる加熱、該熱ごての後に隣接するピンチローラによる挟圧で融着・接合する防水シートの施工法について記載されている。
このような自動溶接機を用いた防水シートの施工法は、隣接する防水シートの側端部同士を、一定の幅で当該自動溶接機に必要な接合幅を確保しながら重ね合わせることが可能な部位には有効である。しかし、防水シートの展張作業は、通例凹凸を有する一次覆工コンクリート面を、トンネル断面、周方向に沿って馴染ませるように行われるため、隣接する防水シートの側端部同士の重ね合わせた幅が、一定の幅にならない部位もでき、特に当該自動溶接機に必要な接合幅よりも狭い部位では、接合が不十分になったり、接合ができなかったりすることがある。 In Japanese Patent Laid-Open No. 7-113399 (Patent Document 1), a heat-sealable waterproof sheet is overlapped on a roof tile and stretched on a construction site, and the overlapped portion is the length of the portion of a dedicated automatic welding machine. It describes a method for constructing a waterproof sheet that is fused and joined by heating with a hot iron of the welding machine and sandwiching pressure by an adjacent pinch roller after the hot iron while moving in the vertical direction.
The construction method of the waterproof sheet using such an automatic welder is capable of overlapping the side end portions of adjacent waterproof sheets while securing a necessary joint width for the automatic welder with a certain width. Effective for sites. However, the expansion work of the waterproof sheet is usually performed so that the primary lining concrete surface having unevenness is adapted to the tunnel cross section along the circumferential direction. However, there may be a portion that does not have a certain width, and particularly in a portion that is narrower than the joining width required for the automatic welding machine, joining may be insufficient or joining may not be possible.

例えば「山岳トンネル工法における防水工指針（案）シート防水編」（昭和６１年６月，社団法人日本トンネル技術協会），ｐ．２９（非特許文献１）には、防水シート側端部同士の接合が不十分な部位や接合ができなかった部位に、これらの部位よりも大きい補修用防水シートを重ね、両者の界面に手動式熱風溶着機で熱風をあてながら、該補修用防水シートをハンドローラー等で押圧し接合する補修方法について記載されている。
しかし、該補修方法は該補修部位が天井や壁面に生じ、該補修部位を地に対して略水平な状態で地方向から天方向へ向けて補修することが前提であり、重力に逆らいながら、該補修用防水シートの一方の側（上記界面に接する面）から熱風、他方の側（上記界面に接する面の反対の面）から加圧を行うもので、熟練工に委ねざるを得ない困難なものであった。
即ち、従来用いられる自動溶接機では接合が困難な部位を簡便で確実に接合できる防水シートの接合構造及び接合方法がなかった。 For example, “Waterproofing Guidelines for Mountain Tunneling Method (draft) Sheet Waterproofing” (June 1986, Japan Tunneling Technology Association), p. 29 (Non-Patent Document 1), a waterproof sheet for repair larger than these parts is superimposed on a part where the waterproof sheet side ends are insufficiently joined or a part where joining is not possible, and is manually applied to the interface between the two. It describes a repair method in which the repair waterproof sheet is pressed with a hand roller or the like while hot air is applied by a hot air welding machine.
However, the repair method is based on the premise that the repair site is generated on the ceiling or the wall surface, and the repair site is repaired from the ground direction to the heaven direction in a substantially horizontal state, against gravity, Hot air is applied from one side of the repair waterproof sheet (surface in contact with the interface) and pressure is applied from the other side (surface opposite to the surface in contact with the interface), and it is difficult to entrust a skilled worker. It was a thing.
In other words, there has been no waterproof sheet joining structure and joining method capable of simply and reliably joining parts difficult to join with a conventional automatic welding machine.

特開平７−１１３３９９号公報JP-A-7-113399 「山岳トンネル工法における防水工指針（案）シート防水編」（昭和６１年６月，社団法人日本トンネル技術協会）"Waterproofing guideline for mountain tunnel construction method (draft) Sheet waterproofing" (June 1986, Japan Tunneling Technology Association)

本発明は、上記事情に鑑みなされたもので、トンネル等の施工に用いる防水シートの接合構造及び接合方法に関し、従来用いられる自動溶接機では接合が困難な部位を簡便で確実に接合できる防水シートの接合構造及び接合方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and relates to a joining structure and joining method for waterproof sheets used for construction of tunnels, etc., and a waterproof sheet that can easily and reliably join parts difficult to join with a conventional automatic welding machine. It is an object to provide a bonding structure and a bonding method.

本発明者等は、上記目的を達成するため、鋭意検討を行った結果、複数の不透水性シートの側端部同士が、少なくとも該不透水性シートに熱融着可能な熱可塑性樹脂層と、これより高融点の耐熱層とからなる接合用シートによって接合されている防水シートの接合構造が有効であり、さらに前記接合構造を適用し、複数の不透水性シートの側端部同士を重ね合わせるか又は近接させ、該重ね合わせた部位又は近接させた部位に、前記接合用シートの、熱可塑性樹脂層側を対向させて重ねると共に、耐熱層側から加熱加圧し、複数の不透水性シートの側端部同士に該接合用シートの熱可塑性樹脂を熱融着することによって接合する防水シートの接合方法によれば、従来用いられる自動溶接機では接合困難な部位を簡便で確実に接合できることを見出し、本発明をなすに至った。 As a result of intensive investigations in order to achieve the above object, the present inventors, as a result, have a thermoplastic resin layer in which at least the side edges of a plurality of water-impermeable sheets can be heat-sealed to the water-impermeable sheet. The bonding structure of the waterproof sheet bonded by the bonding sheet composed of the heat-resistant layer having a higher melting point than this is effective. Further, the bonding structure is applied, and the side end portions of the plurality of water-impermeable sheets are overlapped with each other. A plurality of water-impermeable sheets are laminated or brought close to each other, and the thermoplastic resin layer side of the joining sheet is overlapped with the overlapped part or the close part, and heated and pressed from the heat-resistant layer side. According to the waterproof sheet joining method in which the thermoplastic resin of the joining sheet is joined to the side edges of the sheet by heat-sealing, it is possible to easily and reliably join parts difficult to join with a conventional automatic welding machine. The Out, it has led to the completion of the present invention.

即ち、本発明は下記防水シートの接合構造及び接合方法を提供する。
請求項１：
複数の不透水性シートの側端部同士が、少なくとも該不透水性シートに熱融着可能な熱可塑性樹脂層と、これより高融点の耐熱層とからなる接合用シートによって接合されていることを特徴とする防水シートの接合構造。
請求項２：
前記熱可塑性樹脂層が、酢酸ビニルを１６〜５０質量％含有するエチレン−酢酸ビニル共重合体からなることを特徴とする請求項１記載の防水シートの接合構造。
請求項３：
前記熱可塑性樹脂層が、極性基を３〜５０質量％グラフト重合している変性ポリオレフィンからなることを特徴とする請求項１記載の防水シートの接合構造。
請求項４：
前記耐熱層が、金属箔からなることを特徴とする請求項１乃至３のいずれか１項記載の防水シートの接合構造。
請求項５：
請求項１乃至４のいずれか１項記載の接合構造を適用し、複数の不透水性シートの側端部同士を重ね合わせるか又は近接させ、該重ね合わせた部位又は近接させた部位に、前記接合用シートの、熱可塑性樹脂層側を対向させて重ねると共に、耐熱層側から加熱加圧し、複数の不透水性シートの側端部同士に該接合用シートの熱可塑性樹脂を熱融着することによって接合することを特徴とする防水シートの接合方法。 That is, the present invention provides the following waterproof sheet joining structure and joining method.
Claim 1:
The side edges of the plurality of water-impermeable sheets are joined together by a joining sheet composed of at least a thermoplastic resin layer that can be heat-sealed to the water-impermeable sheet and a heat-resistant layer having a higher melting point. Waterproof sheet joining structure characterized by
Claim 2:
The waterproof sheet joining structure according to claim 1, wherein the thermoplastic resin layer is made of an ethylene-vinyl acetate copolymer containing 16 to 50% by mass of vinyl acetate.
Claim 3:
The waterproof sheet joining structure according to claim 1, wherein the thermoplastic resin layer is made of a modified polyolefin in which a polar group is graft-polymerized in an amount of 3 to 50% by mass.
Claim 4:
The waterproof sheet bonding structure according to claim 1, wherein the heat-resistant layer is made of a metal foil.
Claim 5:
Applying the joining structure according to any one of claims 1 to 4, the side end portions of a plurality of water-impermeable sheets are overlapped or brought close together, The bonding sheet is overlapped with the thermoplastic resin layer facing each other, heated and pressurized from the heat-resistant layer side, and the thermoplastic resin of the bonding sheet is heat-sealed to the side edges of the plurality of water-impermeable sheets. The joining method of the waterproof sheet characterized by joining by.

本発明によれば、トンネル等の施工に用いる防水シートの接合構造及び接合方法に関し、従来用いられる自動溶接機では接合困難な部位を簡便で確実に接合できる防水シートの接合構造及び接合方法を提供することができる。 According to the present invention, a waterproof sheet joining structure and joining method used for construction of tunnels and the like are provided, and a waterproof sheet joining structure and joining method capable of easily and reliably joining parts difficult to join with a conventional automatic welding machine is provided. can do.

BEST MODE FOR CARRYING OUT THE INVENTION

以下、本発明について図面を参照してより詳細に説明する。
図１（Ａ）は本発明の一構成例に採用される接合用シート１を示す断面図であり、（Ｂ）は他の接合用シート１’を示す断面図である。
接合用シート１は、熱可塑性樹脂層２の一面に、これより高融点の耐熱層３が積層されてなる。また、接合用シート１’は、熱可塑性樹脂層２と、これより高融点の耐熱層３との間に両者を接合する接着層４が介挿されてなる。
ここで、後述するように接合用シート１又は１’の熱可塑性樹脂層２，２は、いずれも防水シート５の不透水性シート７に熱融着可能なものである。 Hereinafter, the present invention will be described in more detail with reference to the drawings.
FIG. 1A is a cross-sectional view showing a bonding sheet 1 employed in one structural example of the present invention, and FIG. 1B is a cross-sectional view showing another bonding sheet 1 ′.
The bonding sheet 1 is formed by laminating a heat-resistant layer 3 having a higher melting point than the thermoplastic resin layer 2 on one surface. In addition, the bonding sheet 1 ′ is formed by inserting an adhesive layer 4 between the thermoplastic resin layer 2 and a heat-resistant layer 3 having a higher melting point than the thermoplastic resin layer 2.
Here, as will be described later, the thermoplastic resin layers 2 and 2 of the bonding sheet 1 or 1 ′ can both be heat-sealed to the water-impermeable sheet 7 of the waterproof sheet 5.

接合用シート１は、熱可塑性樹脂層２と耐熱層３の相溶性（接着性）が高く、例えば、押出しラミネート法などを用い、接着層４を介すことなく、熱可塑性樹脂層２と耐熱層３がラミネートされた形態を示し、接合用シート１’は、熱可塑性樹脂層２と耐熱層３の相溶性（接着性）が低く、例えば、ドライラミネート法などを用い、粘着剤や接着剤による接着層４を介して、熱可塑性樹脂層２と耐熱層３がラミネートされた形態を示している。 The bonding sheet 1 has high compatibility (adhesiveness) between the thermoplastic resin layer 2 and the heat-resistant layer 3. For example, the bonding sheet 1 can be bonded to the thermoplastic resin layer 2 and the heat-resistant layer without using the adhesive layer 4 by using an extrusion laminating method or the like. The layer 3 is laminated, and the bonding sheet 1 ′ has a low compatibility (adhesiveness) between the thermoplastic resin layer 2 and the heat-resistant layer 3, and uses, for example, a dry laminating method, etc. The form in which the thermoplastic resin layer 2 and the heat-resistant layer 3 are laminated through the adhesive layer 4 is shown.

また、図２は本発明の一構成例に採用される防水シート５を示す断面図である。
防水シート５は、透水性シート６、不透水性シート７からなる積層体で、両シートは両側端部、即ち、透水性シート６の一方の側端部６ａと不透水性シート７の一方の側端部７ａ、透水性シート６の他方の側端部６ｂと不透水性シート７の他方の側端部７ｂが互いに遊離状態となるように部分的に接着されている。なお、両シート６，７の接着は、両シート６，７の両側端部が互いに遊離状態になっていれば良く、他の部分は部分接着されていても全面接着されていても良いものである。
透水性シート６、不透水性シート７はいずれも、従来トンネル施工に使用されているものを使用することができ、具体的に透水性シート６には、ポリエステル，ポリオレフィン（ポリエチレン，ポリプロピレン等）（以下、順に‘ＰＥＴ’，‘ＰＯ’，‘ＰＥ’，‘ＰＰ’と略記）のプラスチック樹脂から形成される不織布又は織布を、不透水性シート７には、エチレン−酢酸ビニル共重合体（以下、‘ＥＶＡ’と略記），ＰＯ（ＰＥ，ＰＰ等），ポリ塩化ビニル（以下、‘ＰＶＣ’と略記）等のプラスチック樹脂から形成されるシートを用いることができる。 Moreover, FIG. 2 is sectional drawing which shows the waterproof sheet 5 employ | adopted as one structural example of this invention.
The waterproof sheet 5 is a laminate composed of a water-permeable sheet 6 and a water-impermeable sheet 7, and both sheets are end portions on both sides, that is, one side end portion 6 a of the water-permeable sheet 6 and one of the water-impermeable sheet 7. The side end portion 7a, the other side end portion 6b of the water-permeable sheet 6 and the other side end portion 7b of the water-impermeable sheet 7 are partially bonded to each other so as to be free from each other. The two sheets 6 and 7 may be bonded as long as both end portions of the sheets 6 and 7 are in a free state, and the other parts may be partially bonded or bonded entirely. is there.
As the water-permeable sheet 6 and the water-impermeable sheet 7, those conventionally used for tunnel construction can be used. Specifically, the water-permeable sheet 6 includes polyester, polyolefin (polyethylene, polypropylene, etc.) ( Hereinafter, a nonwoven fabric or a woven fabric formed from plastic resins of “PET”, “PO”, “PE”, and “PP” in this order) is used as the water-impermeable sheet 7 with an ethylene-vinyl acetate copolymer ( Hereinafter, a sheet formed of a plastic resin such as 'EVA' (abbreviated as 'EVA'), PO (PE, PP, etc.), polyvinyl chloride (hereinafter abbreviated as 'PVC') can be used.

図３は本発明の一構成例に係る防水シート５，５の接合部位を説明する斜視図であり、図４（Ａ）は図３の防水シート５，５を一点鎖線Ｘ₂に沿って該防水シート５，５面に垂直に切断した断面図であり、（Ｂ）は図３の防水シート５，５を一点鎖線Ｘ₁に沿って該防水シート５，５面に垂直に切断した断面図であり、（Ｃ）は図３の防水シート５，５を一点鎖線Ｘ₃に沿って該防水シート５，５面に垂直に切断した断面である。
図４（Ａ），（Ｂ），（Ｃ）は、いずれも図３の紙面に対して紙面裏から表へ垂直に向かう方向を、図４の紙面上の上から下に垂直に向かう方向に一致させ、かつ図３紙面上の一点鎖線Ｘ₁，Ｘ₂，Ｘ₃に付した矢印の方向に向けて見たものである。 FIG. 3 is a perspective view for explaining a joint portion of the waterproof sheets 5 and 5 according to an example of the present invention. FIG. 4A shows the waterproof sheets 5 and 5 of FIG. 3 along the alternate long and short dash line X _2. FIG. 5B is a cross-sectional view cut perpendicularly to the surfaces of the waterproof sheets 5 and 5, and FIG. 5B is a cross-sectional view of the waterproof sheets 5 and 5 of FIG. 3 cut perpendicularly to the surfaces of the waterproof sheets 5 and 5 along the alternate long and short dash line X ₁ . and is a (C) is a cross section taken along a surface perpendicular to a waterproof sheet 5,5 surface along the waterproof sheet 5 and 5 the dashed line X ₃ in FIG.
4 (A), 4 (B), and 4 (C) are all perpendicular to the paper surface of FIG. 3 from the back of the paper surface to the front, and vertically upward from the top of the paper surface of FIG. FIG. 3 is a view taken in the direction of the arrows attached to the alternate long and short dash lines X ₁ , X ₂ , and X ₃ on the paper surface of FIG.

図３に示したハッチングは、２つの防水シート５，５の不透水性シート７，７の側端部７ａ，７ｂ同士の重さなり合う部位を示している。
この重さなり合う部位を自動溶接機で接合するに際し、該重なり合う部位の幅が一点鎖線Ｘ₃に沿って防水シート５，５面に垂直に切断した断面、即ち、図４（Ｃ）のように正規の幅Ｗ_X3を維持できている場合は接合に支障をきたさないが、一点鎖線Ｘ₂に沿って防水シート５，５面に垂直に切断した断面、即ち、図４（Ａ）のように正規の幅よりもやや不足する場合（幅Ｗ_X2）や、一点鎖線Ｘ₁に沿って防水シート５，５面に垂直に切断した断面、即ち、図４（Ｂ）のように重なり合う部位の幅が全く存在しない場合（幅−Ｗ_X1）は、接合が不十分になるか、接合が全くできなくなる。
本発明はこのような不透水性シート７，７の側端部７ａ，７ｂ同士の重なり合う部位の幅が正規の幅Ｗ_X3に満たない場合（幅Ｗ_X2，幅−Ｗ_X1）を含む防水シートの接合に係るものである。
なお、ここでいう正規の幅Ｗ_X3とは、少なくとも従来の自動溶接機による接合に必要な所定の幅であって、実際に融着される接合幅以上の幅であり、５０〜１００ｍｍ程度の幅を指す。 The hatching shown in FIG. 3 shows a portion where the side end portions 7a and 7b of the water-impermeable sheets 7 and 7 of the two waterproof sheets 5 and 5 overlap each other.
When joining the overlapping parts with an automatic welding machine, the width of the overlapping part is a cross section cut perpendicularly to the waterproof sheets 5 and 5 along the alternate long and short dash line X ₃ , that is, as shown in FIG. In the case where the regular width W _X3 can be maintained, the joining is not hindered, but the cross section cut perpendicularly to the waterproof sheets 5 and 5 along the alternate long and short dash line X ₂ , that is, as shown in FIG. 4 is slightly shorter than the normal width (width W _X2 ), or a cross section cut perpendicularly to the waterproof sheets 5 and 5 along the alternate long and short dash line X ₁ , that is, an overlapping portion as shown in FIG. When there is no width at all (width−W _X1 ), the bonding becomes insufficient or cannot be performed at all.
The present invention includes a waterproof sheet including a case where the width of the overlapping portions of the side end portions 7a and 7b of the water-impermeable sheets 7 and 7 is less than the normal width W _X3 (width W _X2 and width −W _X1 ). This relates to the joining.
Here, the regular width W _X3 is at least a predetermined width necessary for joining by a conventional automatic welding machine, and is a width equal to or larger than a joining width actually fused, and is about 50 to 100 mm. Refers to the width.

本発明の一構成例に係る防水シート５，５の接合構造は、図４（Ａ），（Ｂ）に示すように２つの防水シート５，５がトンネル地山、一次覆工コンクリート１１の面に、共に透水性シート６，６側の面が対向するように配設され、一方の防水シート５の透水性シート６の一側端部６ａと他方の防水シート５の透水性シート６の他の側端部６ｂとが重ね合わせられ、該透水性シート６，６の側端部６ａ，６ｂの重ね合わせられた部位がコンクリート釘８で一次覆工コンクリート１１側に固定されると共に、一方の防水シート５の不透水性シート７の一側端部７ａと他方の防水シート５の不透水性シート７の他の側端部７ｂとが重ね合わせられるか（図３の一点鎖線Ｘ₂に沿って防水シート５，５面に垂直に切断した断面、即ち図４（Ａ）に該当）又は近接され（図３の一点鎖線Ｘ₁に沿って防水シート５，５面に垂直に切断した断面、即ち図４（Ｂ）に該当）、該不透水性シート７，７の側端部７ａ，７ｂの重ね合わせられた部位又は近接された部位に前記接合用シート１又は１’の熱可塑性樹脂層２側が対向させて重ねられ、２つの不透水性シート７，７の側端部７ａ，７ｂに該接合用シートの熱可塑性樹脂が熱融着されることによって接合されてなる構造を採っている。 As shown in FIGS. 4 (A) and 4 (B), the joining structure of the waterproof sheets 5 and 5 according to one configuration example of the present invention is that the two waterproof sheets 5 and 5 are tunnel ground and the surface of the primary lining concrete 11. In addition, the water permeable sheets 6 and 6 are disposed so that the surfaces of the water permeable sheets 6 and 6 face each other, and one side end portion 6a of the water permeable sheet 6 of one waterproof sheet 5 and the other water permeable sheet 6 of the other waterproof sheet 5. The side end portions 6b of the water permeable sheets 6 and 6 are overlapped with each other, and the overlapped portions of the side end portions 6a and 6b of the water-permeable sheets 6 and 6 are fixed to the primary lining concrete 11 side with the concrete nails 8 and or the other side end portion 7b of the water-impermeable sheet 7 of one side end portion 7a and the other of the waterproof sheet 5 impermeable sheet 7 of the waterproof sheet 5 is superimposed (along one-dot chain line X ₂ in FIG. 3 The cross section cut perpendicularly to the waterproof sheets 5 and 5, that is, corresponds to FIG. Or in proximity (section cut perpendicular to the tarpaulin 5,5 surface along one-dot chain line X ₁ in FIG. 3, i.e. corresponding to FIG. 4 (B)), the side end portion 7a of the said non water permeable sheet 7,7 , 7b, the thermoplastic resin layer 2 side of the bonding sheet 1 or 1 'is opposed to the overlapped portion or the adjacent portion, and the side end portions 7a of the two water-impermeable sheets 7, 7 are overlapped. 7b has a structure in which the thermoplastic resin of the bonding sheet is bonded by heat fusion.

このような防水シート５，５の接合構造を採ることによって、防水シート５，５の展張作業が凹凸を有する一次覆工コンクリート面１１に馴染ませるように行われるに際し、２つの防水シート５，５の不透水性シート７，７の一方の側端部７ａと他方の側端部７ｂの重ね合わせられた部位が、従来の自動溶接機に必要な接合幅（上記正規の幅Ｗ_X3）に対して不足したり（幅Ｗ_X2）、或いは重ね合わせられた部位が全く存在しなかったり（幅−Ｗ_X1）しても、上記接合用シート１又は１’を介して不透水性シート７，７の側端部７ａ，７ｂ同士を簡便で確実に接合することができる。 By adopting such a joining structure of the waterproof sheets 5, 5, when the work of extending the waterproof sheets 5, 5 is performed so that the primary lining concrete surface 11 having irregularities is fitted, the two waterproof sheets 5, 5 are used. The portion where one side end portion 7a and the other side end portion 7b of the water-impermeable sheet 7, 7 are overlapped with each other with respect to the joining width (the above-mentioned regular width W _X3 ) required for the conventional automatic welding machine Even if it is insufficient (width W _X2 ) or there is no overlapped portion (width -W _X1 ), the impervious sheets 7, 7 through the bonding sheet 1 or 1 ′. The side end portions 7a and 7b can be simply and reliably joined.

即ち、本発明の防水シート５，５の接合構造に係る接合用シート１又は１’は、少なくとも熱可塑性樹脂層２と、これより高融点の耐熱層３とが一体にラミネートされており、該耐熱層３側から熱可塑性樹脂層２への熱伝達による接合を前提とした構成であるため、後述する２つの防水シート５，５の不透水性シート７，７の側端部７ａ，７ｂを接合用シート１又は１’によって接合するに際し、非特許文献１の補修用防水シートと異なり、熱を印加する方向と押圧する方向とを一致させることができるため、該側端部７ａ，７ｂを容易に融着・接合することを可能とする簡便さと単調な作業性の良さを備えたものとなる。
しかも、接合用シート１又は１’をなす各層は、公知のシート成形技術を用いて作製され、その一体化は後述する公知のラミネート技術で作製されるので、該各層の厚さはもとより、ラミネート後の厚さもばらつきの少ない高品質なものであることから、該接合用シート１又は１’の熱可塑性樹脂層２と防水シート５，５の不透水性シート７，７の側端部７ａ，７ｂ同士との接着品質（接着強度，接着耐久性など）も変動しにくい高品質なものとなる。 That is, the bonding sheet 1 or 1 ′ according to the bonding structure of the waterproof sheets 5 and 5 of the present invention is integrally laminated with at least the thermoplastic resin layer 2 and the heat-resistant layer 3 having a higher melting point than that, Since the structure is based on the premise of joining by heat transfer from the heat-resistant layer 3 side to the thermoplastic resin layer 2, side end portions 7a and 7b of the water-impermeable sheets 7 and 7 of the two waterproof sheets 5 and 5 described later are provided. When joining with the joining sheet 1 or 1 ′, unlike the repair waterproof sheet of Non-Patent Document 1, the direction of applying heat and the direction of pressing can be matched, so that the side end portions 7a and 7b are It becomes simple and easy to work and can be easily fused and joined.
In addition, each layer forming the bonding sheet 1 or 1 ′ is manufactured by using a known sheet forming technique, and the integration thereof is manufactured by a known laminating technique to be described later. Since the later thickness is also of high quality with little variation, the thermoplastic resin layer 2 of the bonding sheet 1 or 1 ′ and the side end portions 7a of the water-impermeable sheets 7 and 7 of the waterproof sheets 5 and 5 The adhesive quality (adhesive strength, adhesive durability, etc.) between 7b is also high quality which is not easily changed.

以上、本発明の一構成例に係る２つの防水シート５，５の接合構造について述べたが、３つ以上の複数の防水シートの接合構造についても、接合用シート１又は１’による同様の接合構造とすることができる。
即ち、３つの防水シートの接合構造については、トンネル地山、一次覆工コンクリート１１の面に、３つの防水シート５，５，５の透水性シート６，６，６側の面が対向するように配設され、３つの防水シート５，５，５の透水性シート６，６，６の一側端部６ａ，６ａ，６ａと他の側端部６ｂ，６ｂ，６ｂが（６ａ，６ａ，６ｂ）又は（６ａ，６ｂ，６ｂ）の組み合わせで重ね合わせられ、この組み合わせで重ね合わせられた部位がコンクリート釘８で一次覆工コンクリート１１側に固定されると共に、３つの防水シート５，５，５の不透水性シート７，７，７の一側端部７ａ，７ａ，７ａと他の側端部７ｂ，７ｂ，７ｂが（７ａ，７ａ，７ｂ）又は（７ａ，７ｂ，７ｂ）の組み合わせで重ね合わせられるか又は近接され、該不透水性シートの側端部（７ａ，７ａ，７ｂ）又は（７ａ，７ｂ，７ｂ）の組み合わせの重ね合わせられた部位又は近接された部位に前記接合用シート１又は１’の熱可塑性樹脂層２側が対向させて重ねられ、３つの不透水性シート７，７，７の側端部（７ａ，７ａ，７ｂ）又は（７ａ，７ｂ，７ｂ）に該接合用シート１又は１’の熱可塑性樹脂２が熱融着されることによって接合されてなる構造とすることができる。
４つの防水シートの接合構造については、トンネル地山、一次覆工コンクリート１１の面に、４つの防水シート５，５，５，５の透水性シート６，６，６，６側の面が対向するように配設され、４つの防水シート５，５，５，５の透水性シート６，６，６，６の一側端部６ａ，６ａ，６ａ，６ａと他の側端部６ｂ，６ｂ，６ｂ，６ｂが（６ａ，６ａ，６ｂ，６ｂ）の組み合わせで重ね合わせられ、この組み合わせで重ね合わせられた部位がコンクリート釘８で一次覆工コンクリート１１側に固定されると共に、４つの防水シート５，５，５，５の不透水性シート７，７，７，７の一側端部７ａ，７ａ，７ａ，７ａと他の側端部７ｂ，７ｂ，７ｂ，７ｂが（７ａ，７ａ，７ｂ，７ｂ）の組み合わせで重ね合わせられるか又は近接され、該不透水性シートの側端部（７ａ，７ａ，７ｂ，７ｂ）の組み合わせの重ね合わせられた部位又は近接された部位に前記接合用シート１又は１’の熱可塑性樹脂層２側が対向させて重ねられ、４つの不透水性シートの側端部（７ａ，７ａ，７ｂ，７ｂ）に該接合用シート１又は１’の熱可塑性樹脂２が熱融着されることによって接合されてなる構造とすることができる。
図５はこのような防水シートの接合構造の特に不透水性シートの平面図を示しており、（Ａ）は不透水性シートの３枚重ねの一例を、（Ｂ）は不透水性シートの４枚重ねの一例を示す平面図である。なお、図中のＳ１，Ｓ２，Ｓ３，Ｓ４はそれぞれ不透水性シートを示している。 As mentioned above, although the joining structure of the two waterproof sheets 5 and 5 which concern on the example of 1 structure of this invention was described, also about the joining structure of three or more waterproof sheets, the same joining by the sheet | seat 1 or 1 'for joining It can be a structure.
That is, with respect to the joining structure of the three waterproof sheets, the surfaces of the three waterproof sheets 5, 5, and 5 on the side of the water permeable sheets 6, 6, and 6 face the tunnel ground and the surface of the primary lining concrete 11. The one side end portions 6a, 6a, 6a and the other side end portions 6b, 6b, 6b of the water-permeable sheets 6, 6, 6 of the three waterproof sheets 5, 5, 5 are (6a, 6a, 6b) or (6a, 6b, 6b) is superposed, and the superposed part is fixed to the primary lining concrete 11 side by the concrete nail 8, and the three waterproof sheets 5, 5, 5 impermeable sheets 7, 7, one side end 7 a, 7 a, 7 a and the other side end 7 b, 7 b, 7 b are (7 a, 7 a, 7 b) or a combination of (7 a, 7 b, 7 b) The impervious sheet The joining sheet 1 or 1 ′ is made to face the thermoplastic resin layer 2 side of the overlapped portion or the adjacent portion of the combination of the side end portions (7a, 7a, 7b) or (7a, 7b, 7b). The thermoplastic resin 2 of the bonding sheet 1 or 1 ′ is heated at the side end portions (7a, 7a, 7b) or (7a, 7b, 7b) of the three water-impermeable sheets 7, 7, 7. It can be set as the structure joined by fuse | melting.
Regarding the joint structure of the four waterproof sheets, the surface of the four waterproof sheets 5, 5, 5, and 5 on the side of the water permeable sheets 6, 6, 6, and 6 faces the tunnel ground and the surface of the primary lining concrete 11. The one side end portions 6a, 6a, 6a, 6a and the other side end portions 6b, 6b of the four waterproof sheets 5, 5, 5, 5 are provided. , 6b, 6b are superposed with a combination of (6a, 6a, 6b, 6b), and the part superposed with this combination is fixed to the primary lining concrete 11 side with concrete nails 8 and four waterproof sheets 5, 5, 5, 5 of the impervious sheets 7, 7, 7, 7 on one side ends 7a, 7a, 7a, 7a and the other side ends 7b, 7b, 7b, 7b are (7a, 7a, 7b, 7b) are superposed or brought close together and the impervious water The bonding sheet 1 or 1 'is overlapped with the thermoplastic resin layer 2 side so as to face the overlapped portion or the adjacent portion of the combination of the side end portions (7a, 7a, 7b, 7b) of the sheet. It is possible to have a structure in which the thermoplastic resin 2 of the bonding sheet 1 or 1 ′ is bonded to the side end portions (7a, 7a, 7b, 7b) of the two water-impermeable sheets. .
FIG. 5 shows a plan view of such a waterproof sheet joining structure, in particular, a water-impermeable sheet. (A) is an example of three sheets of water-impermeable sheets, and (B) is an impermeable sheet. It is a top view which shows an example of 4 sheets overlapping. In addition, S1, S2, S3, and S4 in the figure indicate impermeable sheets, respectively.

ここで、本発明の防水シートの接合構造に採用される接合用シート１又は１’の熱可塑性樹脂層２の材質としては、トンネル等の施工に用いられる防水シート５をなす不透水性シート７に熱融着できる材質でなければならず、上述の通り該不透水性シート７の材質は、ＥＶＡ樹脂、ＰＯ（ＰＥ，ＰＰ等）樹脂、ＰＶＣ樹脂等の熱可塑性樹脂が用いられることから、これらと同種の樹脂や、これらの樹脂をベースに熱融着性等を考慮した変性樹脂を用いることができ、中でもＥＶＡ樹脂又は変性ＰＯ樹脂が好適である。 Here, as the material of the thermoplastic resin layer 2 of the bonding sheet 1 or 1 ′ employed in the bonding structure of the waterproof sheet of the present invention, the water-impermeable sheet 7 forming the waterproof sheet 5 used for construction of a tunnel or the like. Since the material of the water-impermeable sheet 7 is a thermoplastic resin such as EVA resin, PO (PE, PP, etc.) resin, PVC resin, etc., as described above, Resins of the same type as these, or modified resins based on these resins and taking heat fusion properties into consideration can be used, and among them, EVA resins or modified PO resins are preferred.

本発明の防水シートの接合構造に採用される接合用シート１又は１’の熱可塑性樹脂層２に用いられるＥＶＡ樹脂は、酢酸ビニル（以下、‘ＶＡ’と略記）含有量を適宜調整することによりＥＶＡ樹脂の接着性、強度、伸びを調整することができる。一般に、ＥＶＡ樹脂へのＶＡ含有量を増やせば、強度は減少し、接着性、伸びは増大し、逆にＥＶＡ樹脂へのＶＡ含有量を減らせば、強度は増大し、接着性、伸びは減少することから、ＥＶＡ樹脂のＶＡ含有量は１６〜５０質量％が好ましく、より好ましくは２０〜３５質量％とすることができる。 The EVA resin used for the thermoplastic resin layer 2 of the bonding sheet 1 or 1 ′ employed in the bonding structure of the waterproof sheet of the present invention is to appropriately adjust the vinyl acetate (hereinafter abbreviated as “VA”) content. Thus, the adhesiveness, strength, and elongation of the EVA resin can be adjusted. In general, increasing the VA content in the EVA resin decreases the strength and increases the adhesion and elongation. Conversely, decreasing the VA content in the EVA resin increases the strength and decreases the adhesion and elongation. Therefore, the VA content of the EVA resin is preferably 16 to 50% by mass, and more preferably 20 to 35% by mass.

また、本発明の防水シートの接合構造に採用される接合用シート１又は１’の熱可塑性樹脂層２に用いられるＰＯ樹脂には、通例のＰＥ樹脂やＰＰ樹脂等の完全非極性のＰＯ樹脂、及びそれらにアクリル酸や無水マレイン酸などの極性基（カルボキシル基）をグラフト重合することにより極性を持たせ、接着性を付与させた変性ＰＯ樹脂を用いることができる。
この場合、ＰＯ樹脂（ＰＥ樹脂，ＰＰ樹脂等）へのアクリル酸や無水マレイン酸などの極性基（カルボキシル基）のグラフト量は３〜５０質量％、より好ましくは７〜４０質量％とすることができる。３質量％よりも極性基のグラフト量が少ないと十分な接着性を付与させることができず、逆に５０質量％より極性基のグラフト量が多いとＰＯ樹脂本来の化学的特性（耐薬品性等）や物理的特性（剛性強度等）が失われるばかりか、接着性も効率的に上げられないため好ましくない。 The PO resin used for the thermoplastic resin layer 2 of the joining sheet 1 or 1 ′ employed in the waterproof sheet joining structure of the present invention is a completely non-polar PO resin such as a usual PE resin or PP resin. Further, a modified PO resin can be used in which polar groups (carboxyl groups) such as acrylic acid and maleic anhydride are graft polymerized to impart polarity and impart adhesiveness.
In this case, the graft amount of polar groups (carboxyl groups) such as acrylic acid and maleic anhydride onto PO resin (PE resin, PP resin, etc.) should be 3 to 50% by mass, more preferably 7 to 40% by mass. Can do. If the grafting amount of the polar group is less than 3% by mass, sufficient adhesion cannot be imparted. Conversely, if the grafting amount of the polar group is more than 50% by mass, the chemical properties inherent to the PO resin (chemical resistance) Etc.) and physical properties (rigid strength, etc.) are lost, and adhesiveness cannot be increased efficiently, which is not preferable.

本発明の防水シートの接合構造に採用される接合用シート１又は１’の熱可塑性樹脂層２の厚さは、０．１〜１．５ｍｍ、より好ましくは、０．２〜１．０ｍｍとすることができる。熱可塑性樹脂層２の厚さが０．１ｍｍよりも薄いと、加熱機９のコテ１０による熱印加によって溶融し、流動する熱可塑性樹脂の量が不足するため、接合用シート１又は１’の熱可塑性樹脂層２と防水シート５の不透水性シート７との熱融着が不十分になり、両者の接合機能が不足するおそれがあり、逆に１．５ｍｍよりも厚いと、熱可塑性樹脂層２の剛性強度が上がって、熱可塑性樹脂層２を防水シート５の不透水性シート７の７ａ，７ｂの重ね合わせ部位へ馴染ませることが困難になり、やはり接合用シート１又は１’の熱可塑性樹脂層２と防水シート５の不透水性シート７との熱融着が不十分になり、両者の接合機能が不足するおそれがある。 The thickness of the thermoplastic resin layer 2 of the bonding sheet 1 or 1 ′ employed in the bonding structure of the waterproof sheet of the present invention is 0.1 to 1.5 mm, more preferably 0.2 to 1.0 mm. can do. If the thickness of the thermoplastic resin layer 2 is less than 0.1 mm, the amount of the thermoplastic resin that melts and flows due to the application of heat by the iron 10 of the heater 9 is insufficient. If the thermoplastic resin layer 2 and the water-impermeable sheet 7 of the waterproof sheet 5 are insufficiently heat-sealed, the bonding function of the two may be insufficient, and conversely, if it is thicker than 1.5 mm, the thermoplastic resin The rigidity strength of the layer 2 is increased, and it becomes difficult to adjust the thermoplastic resin layer 2 to the overlapped portion of the water-impermeable sheet 7 of the waterproof sheet 5 and the bonding sheet 1 or 1 ′. Thermal fusion between the thermoplastic resin layer 2 and the water-impermeable sheet 7 of the waterproof sheet 5 becomes insufficient, and the bonding function between them may be insufficient.

本発明の防水シートの接合構造に採用される接合用シート１又は１’の耐熱層３の材質は、熱可塑性樹脂層２との融点の差、熱可塑性樹脂層２との相溶性（接着性）、そして熱伝導速度（熱伝導率）を考慮して決めることができる。
本発明の防水シートの接合構造に採用される接合用シート１又は１’の耐熱層３の融点は、熱可塑性樹脂層２（及び接着層４）の融点に対して５０℃以上、好ましくは８０℃以上、さらに好ましくは１００℃以上の温度差があることが好ましい。５０℃未満の温度差の場合、加熱機９のコテ１０により耐熱層３を経て熱可塑性樹脂層２に十分に熱伝導する前に耐熱層３が容易に溶融し、加熱機９のコテ１０に融着してしまい、補修作業を中断させざるを得なくなるおそれがある。
また、本発明の防水シートの接合構造に採用される接合用シート１又は１’の耐熱層３を、熱可塑性樹脂層２に対して相溶性（接着性）が高いものとすることにより、図１（Ｂ）のような接着層４を介す必要がなくなるため（従って、図１（Ａ）のような構成にできるため）、コスト的に有利になると共に、耐熱層３から熱可塑性樹脂層２への熱伝導を直接的なものとすることができ、より好ましい。
さらに、本発明の防水シートの接合構造に採用される接合用シート１又は１’の耐熱層３は、０．１Ｗ／ｍＫ以上の熱伝導率のものを使用することが好ましい。これは０．１Ｗ／ｍＫ未満の熱伝導率のものを使用すると、加熱機９のコテ１０からの熱を、耐熱層３を介して熱可塑性樹脂層２へ十分に伝えることができないためである。
このような条件を満たす耐熱層３の材質として、具体的には、熱可塑性樹脂層２の材質よりも高融点であることが前提となるが、ＰＥＴ、ポリアミド（以下、‘ＰＡ’と略記）などのプラスチック樹脂や、アルミ、銅、ステンレス（以下、順に‘Ａｌ’，‘Ｃｕ’，‘Ｓｔｌ’と略記）等の金属箔を挙げることができる。 The material of the heat-resistant layer 3 of the bonding sheet 1 or 1 ′ employed in the waterproof sheet bonding structure of the present invention is a difference in melting point with the thermoplastic resin layer 2 and compatibility (adhesiveness) with the thermoplastic resin layer 2. ), And can be determined in consideration of the heat conduction rate (thermal conductivity).
The melting point of the heat-resistant layer 3 of the bonding sheet 1 or 1 ′ employed in the bonding structure of the waterproof sheet of the present invention is 50 ° C. or more, preferably 80 with respect to the melting point of the thermoplastic resin layer 2 (and the adhesive layer 4). It is preferable that there is a temperature difference of at least 100 ° C, more preferably at least 100 ° C. In the case of a temperature difference of less than 50 ° C., the heat-resistant layer 3 is easily melted by the iron 10 of the heater 9 through the heat-resistant layer 3 and sufficiently transferred to the thermoplastic resin layer 2. There is a possibility that the repair work must be interrupted due to fusion.
Further, the heat-resistant layer 3 of the bonding sheet 1 or 1 ′ employed in the waterproof sheet bonding structure of the present invention has a high compatibility (adhesiveness) with the thermoplastic resin layer 2, thereby This eliminates the need for the adhesive layer 4 as shown in FIG. 1B (therefore, it can be configured as shown in FIG. 1A), which is advantageous in terms of cost, and from the heat-resistant layer 3 to the thermoplastic resin layer. Heat conduction to 2 can be made direct, and is more preferable.
Further, the heat-resistant layer 3 of the bonding sheet 1 or 1 ′ employed in the waterproof sheet bonding structure of the present invention preferably has a thermal conductivity of 0.1 W / mK or more. This is because if heat conductivity of less than 0.1 W / mK is used, the heat from the iron 10 of the heater 9 cannot be sufficiently transferred to the thermoplastic resin layer 2 through the heat-resistant layer 3. .
Specifically, the material of the heat-resistant layer 3 satisfying such conditions is premised on a higher melting point than the material of the thermoplastic resin layer 2, but PET, polyamide (hereinafter abbreviated as “PA”). And a metal foil such as aluminum, copper, and stainless steel (hereinafter abbreviated as “Al”, “Cu”, and “Stl”).

本発明の防水シートの接合構造に採用される接合用シート１又は１’として、上記防水シート５の不透水性シート７への熱融着性、熱可塑性樹脂層２と耐熱層３との融点の差、熱可塑性樹脂層２と耐熱層３との相溶性（ラミネート加工性，接着層有無）、耐熱層３の熱伝導速度（熱伝導率）を勘案すると、熱可塑性樹脂層２と耐熱層３との材質的な組み合わせの中で最も好ましい組み合わせは、（熱可塑性樹脂層２／耐熱層３）＝（プラスチック樹脂／金属箔）とするのが好ましく、具体的に例示すると、（熱可塑性樹脂層２／耐熱層３）＝（ＥＶＡ樹脂／Ａｌ箔），（ＥＶＡ樹脂／Ｃｕ箔），（ＥＶＡ樹脂／Ｓｔｌ箔），（ＰＥ樹脂／Ａｌ箔），（ＰＥ樹脂／Ｃｕ箔），（ＰＥ樹脂／Ｓｔｌ箔），（変性ＰＥ樹脂／Ａｌ箔），（変性ＰＥ樹脂／Ｃｕ箔），（変性ＰＥ樹脂／Ｓｔｌ箔），（変性ＰＰ樹脂／Ａｌ箔），（変性ＰＰ樹脂／Ｃｕ箔），（変性ＰＰ樹脂／Ｓｔｌ箔）等の組み合わせが好適である。 As the bonding sheet 1 or 1 ′ employed in the waterproof sheet bonding structure of the present invention, the heat-sealing property of the waterproof sheet 5 to the water-impermeable sheet 7, the melting point of the thermoplastic resin layer 2 and the heat-resistant layer 3. The thermoplastic resin layer 2 and the heat-resistant layer are considered in consideration of the difference between them, the compatibility between the thermoplastic resin layer 2 and the heat-resistant layer 3 (laminate workability, adhesive layer presence / absence), and the heat conduction speed (heat conductivity) of the heat-resistant layer 3. The most preferable combination among the material combinations with 3 is preferably (thermoplastic resin layer 2 / heat resistant layer 3) = (plastic resin / metal foil). Layer 2 / heat-resistant layer 3) = (EVA resin / Al foil), (EVA resin / Cu foil), (EVA resin / Stl foil), (PE resin / Al foil), (PE resin / Cu foil), (PE Resin / Stl foil), (modified PE resin / Al foil), (modified PE tree) / Cu foil) is preferably a combination such as (modified PE resin / Stl foil), (modified PP resin / Al foil), (modified PP resin / Cu foil), (modified PP resin / Stl foil).

また、（熱可塑性樹脂層２／耐熱層３）＝（プラスチック樹脂／プラスチック樹脂）の組み合わせも勿論可能であり、具体的に例示すると、（熱可塑性樹脂層２／耐熱層３）＝（ＥＶＡ樹脂／ＰＥＴ樹脂），（ＥＶＡ樹脂／ＰＡ樹脂），（ＰＥ樹脂／ＰＥＴ樹脂），（ＰＥ樹脂／ＰＡ樹脂），（変性ＰＥ樹脂／ＰＥＴ樹脂），（変性ＰＥ樹脂／ＰＡ樹脂），（変性ＰＰ樹脂／ＰＥＴ樹脂），（変性ＰＰ樹脂／ＰＡ樹脂）等の組み合わせを採用することができる。 Of course, a combination of (thermoplastic resin layer 2 / heat resistant layer 3) = (plastic resin / plastic resin) is also possible. Specifically, (thermoplastic resin layer 2 / heat resistant layer 3) = (EVA resin) / PET resin), (EVA resin / PA resin), (PE resin / PET resin), (PE resin / PA resin), (modified PE resin / PET resin), (modified PE resin / PA resin), (modified PP) Combinations such as (resin / PET resin) and (modified PP resin / PA resin) can be employed.

さらに、本発明の防水シートの接合構造に採用される接合用シート１又は１’の耐熱層３は、上記プラスチック樹脂、金属箔を任意の組み合わせでラミネートしたものも用いることができる。 Furthermore, as the heat-resistant layer 3 of the bonding sheet 1 or 1 ′ employed in the waterproof sheet bonding structure of the present invention, a laminate obtained by laminating the above plastic resin and metal foil in any combination can be used.

また、本発明の防水シートの接合構造に採用される接合用シート１又は１’の耐熱層３の厚さは、０．０１〜０．１ｍｍ、より好ましくは０．０３〜０．０８ｍｍとすることができる。耐熱層３の厚さが０．０１ｍｍよりも薄いと、耐熱層３の剛性強度が不足するおそれがあり、逆に０．１ｍｍよりも厚いと、耐熱層３の剛性強度が上がって、熱可塑性樹脂層２を防水シート５の不透水性シート７へ馴染ませることが困難になり、防水シート５の不透水性シート７を接合する機能が不足するおそれがある。 Moreover, the thickness of the heat-resistant layer 3 of the bonding sheet 1 or 1 ′ employed in the waterproof sheet bonding structure of the present invention is 0.01 to 0.1 mm, more preferably 0.03 to 0.08 mm. be able to. If the thickness of the heat-resistant layer 3 is less than 0.01 mm, the rigidity of the heat-resistant layer 3 may be insufficient. Conversely, if the thickness of the heat-resistant layer 3 is more than 0.1 mm, the rigidity of the heat-resistant layer 3 is increased and thermoplasticity is increased. It becomes difficult to adjust the resin layer 2 to the water-impermeable sheet 7 of the waterproof sheet 5, and the function of joining the water-impermeable sheet 7 of the waterproof sheet 5 may be insufficient.

上記熱可塑性樹脂層２と耐熱層３は公知のラミネート技術を用い容易に積層することができる。
上記熱可塑性樹脂層２の材質と耐熱層３の材質との相溶性（接着性）が高い組み合わせ、例えば、（熱可塑性樹脂層２／耐熱層３）＝（ＥＶＡ樹脂／Ａｌ箔），（ＥＶＡ樹脂／Ｃｕ箔），（変性ＰＥ樹脂／ＰＡ樹脂），（変性ＰＥ樹脂／ＰＥＴ樹脂），（変性ＰＥ樹脂／Ａｌ箔），（変性ＰＥ樹脂／Ｃｕ箔），（変性ＰＰ樹脂／ＰＡ樹脂），（変性ＰＰ樹脂／ＰＥＴ樹脂），（変性ＰＰ樹脂／Ａｌ箔），（変性ＰＰ樹脂／Ｃｕ箔）等であれば、例えば、予め公知のシート化技術で作製された耐熱シート（層）３の上に熱可塑性樹脂を溶融・押出して熱可塑性樹脂層２を形成し、これを加圧ロール間に通過させ、加圧一体化し、接合用シート１とする押出しラミネート法、或いは耐熱性樹脂及び熱可塑性樹脂を共に溶融・押出して耐熱層３と熱可塑性樹脂層２を形成し、これを加圧ロール間に通過させ、加圧一体化し、接合用シート１とする共押出しラミネート法等を用いることができる。 The thermoplastic resin layer 2 and the heat-resistant layer 3 can be easily laminated using a known laminating technique.
A combination having a high compatibility (adhesiveness) between the material of the thermoplastic resin layer 2 and the material of the heat-resistant layer 3, for example, (thermoplastic resin layer 2 / heat-resistant layer 3) = (EVA resin / Al foil), (EVA) Resin / Cu foil), (Modified PE resin / PA resin), (Modified PE resin / PET resin), (Modified PE resin / Al foil), (Modified PE resin / Cu foil), (Modified PP resin / PA resin) , (Modified PP resin / PET resin), (modified PP resin / Al foil), (modified PP resin / Cu foil), etc., for example, a heat-resistant sheet (layer) 3 previously prepared by a known sheeting technique A thermoplastic resin layer 2 is formed by melting and extruding a thermoplastic resin layer thereon, passing between the pressure rolls, and pressing and integrating to form a joining sheet 1, or a heat-resistant resin and Heat-resistant layer 3 and heat by melting and extruding thermoplastic resin together Forming a plastic resin layer 2, which is passed through between pressure rolls, integrated pressure, can be used co-extrusion lamination method of the bonding sheet 1.

また、特に上記熱可塑性樹脂層２の材質と耐熱性層３の材質との相溶性（接着性）が低い組み合わせ、例えば、（熱可塑性樹脂層２／耐熱層３）＝（ＥＶＡ樹脂／ＰＡ樹脂），（ＥＶＡ樹脂／ＰＥＴ樹脂），（ＰＥ樹脂／Ａｌ箔），（ＰＥ樹脂／Ｃｕ箔），（ＰＥ樹脂／ＰＥＴ樹脂），（ＰＥ樹脂／ＰＡ樹脂）等であれば、例えば、耐熱シート（層）３と熱可塑性樹脂シート（層）２のどちらか一方或いは両方に液状のイソシアネート系やウレタン系などの接着剤を塗布して接着層４を形成し、これを一旦、乾燥させた後、重ね合わせ、これらを加圧ロールで加圧一体化し、接合用シート１’とするドライラミネート法等を用いることができる。
なお、上記熱可塑性樹脂層２の材質と耐熱層３の材質との相溶性（接着性）が高い組み合わせであっても、両者間に接着層４を介挿し、例えば、上記ドライラミネート法等により一体化し、接合用シート１’とすることも勿論可能である。 In particular, a combination having a low compatibility (adhesiveness) between the material of the thermoplastic resin layer 2 and the material of the heat-resistant layer 3, for example, (thermoplastic resin layer 2 / heat-resistant layer 3) = (EVA resin / PA resin) ), (EVA resin / PET resin), (PE resin / Al foil), (PE resin / Cu foil), (PE resin / PET resin), (PE resin / PA resin), etc. After applying a liquid isocyanate-based or urethane-based adhesive to one or both of the (layer) 3 and the thermoplastic resin sheet (layer) 2 to form an adhesive layer 4 and drying it once In addition, a dry laminating method or the like can be used such that they are superposed and these are pressure-integrated with a pressure roll to form a bonding sheet 1 ′.
Even if the material of the thermoplastic resin layer 2 and the material of the heat-resistant layer 3 are highly compatible (adhesiveness), the adhesive layer 4 is interposed between them, for example, by the dry laminating method or the like. It is of course possible to integrate them into a bonding sheet 1 ′.

このように本発明の接合構造に採用される接合用シート１又は１’は、公知のシート成形技術やラミネート技術を用いて形成できるので、これをなす各層（熱可塑性樹脂層２，耐熱層３，必要に応じて接着層４）の厚さは数μｍの公差にコントロールでき、厚さばらつきの少ない高品質なものとすることができる。 As described above, the bonding sheet 1 or 1 ′ employed in the bonding structure of the present invention can be formed by using a known sheet molding technique or laminating technique, and thus each layer (thermoplastic resin layer 2, heat-resistant layer 3). If necessary, the thickness of the adhesive layer 4) can be controlled to a tolerance of several μm and can be of high quality with little thickness variation.

また、例えば上記の接着剤に変えてアクリル系やシリコーン系などの粘着剤を、耐熱シート（層）３と熱可塑性樹脂シート（層）２のどちらか一方、或いは両方に塗布又は転写して接着層４を形成し、これらを加圧ロールで加圧一体化し、接合用シート１’とすることもできる。この場合、必要に応じて、補修後に耐熱層３を剥ぎ取り除去することも可能となる。 For example, instead of the above adhesive, an adhesive such as acrylic or silicone is applied or transferred to one or both of the heat-resistant sheet (layer) 3 and the thermoplastic resin sheet (layer) 2 and bonded. It is also possible to form the layer 4 and press and integrate them with a pressure roll to form a bonding sheet 1 ′. In this case, if necessary, the heat-resistant layer 3 can be peeled off and removed after the repair.

このようにして積層・形成される接合用シート１又は１’の大きさ、厚さなどは、上記熱可塑性樹脂層２及び耐熱層３（そして接着層４）の厚さを考慮しつつも、特に制限されず、従来よりトンネルの防水施工に使用されている防水シート５の不透水性シート７の側端部同士の接合部位の大きさや厚さを考慮し、幅１５０ｍｍ程度、厚さ０．３〜１．６ｍｍ，特に０．５ｍｍ程度とするのが好適である。
また、このような接合用シート１又は１’をロール状とし、必要に応じて、任意の長さに切り出せるようなカッター手段を付与させると、さらに使い勝手がよくなり好ましい。 The size, thickness, etc. of the bonding sheet 1 or 1 ′ thus laminated and formed are considered in consideration of the thickness of the thermoplastic resin layer 2 and the heat-resistant layer 3 (and the adhesive layer 4). There is no particular limitation, and considering the size and thickness of the joint portion between the side edges of the water-impermeable sheet 7 of the waterproof sheet 5 conventionally used for tunnel waterproofing construction, the width is about 150 mm, the thickness is about 0.1 mm. The thickness is preferably 3 to 1.6 mm, particularly about 0.5 mm.
In addition, it is preferable that the joining sheet 1 or 1 ′ is formed in a roll shape and, if necessary, provided with a cutter means that can be cut into an arbitrary length, the usability is further improved.

こうした本発明の一構成例に係る防水シートの接合構造を適用した防水シートの接合方法は、図４（Ａ），（Ｂ）に示すように２つの防水シート５，５がトンネル地山、一次覆工コンクリート１１の面に、共に透水性シート６，６側の面が対向するように配設し、一方の防水シート５の透水性シート６の一側端部６ａと他方の防水シート５の透水性シート６の他の側端部６ｂとを重ね合わせ、該透水性シート６，６の側端部６ａ，６ｂの重ね合わせた部位をコンクリート釘８で一次覆工コンクリート１１側に固定すると共に、一方の防水シート５の不透水性シート７の一側端部７ａと他方の防水シート５の不透水性シート７の他の側端部７ｂとを重ね合わせるか（図３の一点鎖線Ｘ₂に沿う断面、即ち図４（Ａ）に該当）又は近接させ（図３の一点鎖線Ｘ₁に沿う断面、即ち図４（Ｂ）に該当）、該不透水性シート７，７の側端部７ａ，７ｂの重ね合わせた部位又は近接させた部位に、前記接合用シート１又は１’の、熱可塑性樹脂層２側を対向させて重ねると共に、該接合用シート１又は１’の耐熱層３側からアイロンなどの加熱機９のコテ１０で加熱加圧し、２つの不透水性シート７，７の側端部７ａ，７ｂ同士に該接合用シート１又は１’の熱可塑性樹脂を熱融着することによって接合する方法を採ることができる。
このような本発明の防水シートの接合方法をとることによって、従来の自動溶接機では接合困難な部位を簡便で確実に接合することができる。 As shown in FIGS. 4 (A) and 4 (B), the waterproof sheet joining method to which the waterproof sheet joining structure according to the configuration example of the present invention is applied includes two waterproof sheets 5 and 5 which are tunnel ground, primary. The surface of the lining concrete 11 is disposed so that the surfaces of the water permeable sheets 6 and 6 face each other, and the one side end 6a of the water permeable sheet 6 of one waterproof sheet 5 and the other waterproof sheet 5 are arranged. The other side end portion 6b of the water permeable sheet 6 is overlapped, and the overlapped portion of the side end portions 6a and 6b of the water permeable sheets 6 and 6 is fixed to the primary lining concrete 11 side with the concrete nails 8. The one side end portion 7a of the water-impermeable sheet 7 of one waterproof sheet 5 and the other side end portion 7b of the water-impermeable sheet 7 of the other waterproof sheet 5 are overlapped (the one-dot chain line X _{2 in} FIG. 3). (Corresponding to FIG. 4A) or close (see FIG. 3). Section along the dashed line X _1, ie corresponds to FIG. 4 (B)), the side end portion 7a of the said non water permeable sheet 7,7, the superimposed site or proximity to sites of 7b, the bonding sheet 1 Or, the thermoplastic resin layer 2 side of 1 ′ is overlapped with each other, and heated and pressed with a iron 10 of a heating machine 9 such as an iron from the heat-resistant layer 3 side of the bonding sheet 1 or 1 ′, and two impermeable water The method of joining by bonding the thermoplastic resin of this sheet | seat 1 or 1 'for bonding to the side edge part 7a, 7b of the adhesive sheets 7 and 7 can be taken.
By taking such a waterproof sheet joining method of the present invention, it is possible to simply and reliably join portions difficult to join with a conventional automatic welding machine.

この場合、上記接合用シート１又は１’を採用した接合方法に係る接着品質（接着強度，接着耐久性など）と、接着時間を勘案すると、（熱可塑性樹脂層２／耐熱層３）＝（プラスチック樹脂／金属箔）の組み合わせ、具体的には、（ＥＶＡ樹脂／Ａｌ箔），（ＥＶＡ樹脂／Ｃｕ箔），（ＥＶＡ樹脂／Ｓｔｌ箔），（ＰＥ樹脂／Ａｌ箔），（ＰＥ樹脂／Ｃｕ箔），（ＰＥ樹脂／Ｓｔｌ箔），（変性ＰＥ樹脂／Ａｌ箔），（変性ＰＥ樹脂／Ｃｕ箔），（変性ＰＥ樹脂／Ｓｔｌ箔），（変性ＰＰ樹脂／Ａｌ箔），（変性ＰＰ樹脂／Ｃｕ箔），（変性ＰＰ樹脂／Ｓｔｌ箔）等の組み合わせなら、加熱機９のコテ１０の表面温度は３００〜６００℃、より好ましくは４００〜５００℃であり、加熱機９のコテ１０の上記耐熱層３への加圧は０．５〜１．５ＭＰａ、より好ましくは０．７〜１．２ＭＰａであり、時間は１０〜９０秒、より好ましくは３０〜６０秒とすることができ、（熱可塑性樹脂層２／耐熱層３）＝（プラスチック樹脂／プラスチック樹脂）の組み合わせ、具体的には、（ＥＶＡ樹脂／ＰＥＴ樹脂），（ＥＶＡ樹脂／ＰＡ樹脂），（ＰＥ樹脂／ＰＥＴ樹脂），（ＰＥ樹脂／ＰＡ樹脂），（変性ＰＥ樹脂／ＰＥＴ樹脂），（変性ＰＥ樹脂／ＰＡ樹脂），（変性ＰＰ樹脂／ＰＥＴ樹脂），（変性ＰＰ樹脂／ＰＡ樹脂）等の組み合わせなら、加熱機９のコテ１０の表面温度は１２０〜３００℃、より好ましくは１５０〜２８０℃であり、加熱機９のコテ１０の上記耐熱層３への加圧は０．５〜１．５ＭＰａ、より好ましくは０．７〜１．２ＭＰａであり、時間は１０〜９０秒、より好ましくは３０〜６０秒とすることができる。 In this case, considering the bonding quality (bonding strength, bonding durability, etc.) and the bonding time according to the bonding method employing the bonding sheet 1 or 1 ′, (thermoplastic resin layer 2 / heat resistant layer 3) = ( Combination of plastic resin / metal foil, specifically, (EVA resin / Al foil), (EVA resin / Cu foil), (EVA resin / Stl foil), (PE resin / Al foil), (PE resin / (Cu foil), (PE resin / St1 foil), (modified PE resin / Al foil), (modified PE resin / Cu foil), (modified PE resin / St1 foil), (modified PP resin / Al foil), (modified) In the case of a combination of (PP resin / Cu foil), (modified PP resin / Stl foil), the surface temperature of the iron 10 of the heater 9 is 300 to 600 ° C., more preferably 400 to 500 ° C. 10 to the heat-resistant layer 3 is 0.5 to 1 5 MPa, more preferably 0.7 to 1.2 MPa, and the time can be 10 to 90 seconds, more preferably 30 to 60 seconds. (Thermoplastic resin layer 2 / heat resistant layer 3) = (plastic resin / Plastic resin), specifically, (EVA resin / PET resin), (EVA resin / PA resin), (PE resin / PET resin), (PE resin / PA resin), (modified PE resin / PET) Resin), (Modified PE resin / PA resin), (Modified PP resin / PET resin), (Modified PP resin / PA resin), etc., the surface temperature of the iron 10 of the heater 9 is 120 to 300 ° C. Preferably it is 150-280 degreeC, the pressurization to the said heat-resistant layer 3 of the iron 10 of the heater 9 is 0.5-1.5MPa, More preferably, it is 0.7-1.2MPa, and time is 10-10. 90 seconds Preferably to 30 to 60 seconds.

以上、本発明の一構成例に係る防水シートの接合構造を適用した２つの防水シート５，５の接合方法について述べたが、３つ以上の複数の防水シートの接合方法についても、接合用シート１又は１’ による同様の接合方法とすることができる。
即ち、３つの防水シートの接合方法については、トンネル地山、一次覆工コンクリート１１の面に、３つの防水シート５，５，５の透水性シート６，６，６側の面が対向するように配設し、３つの防水シート５，５，５の透水性シート６，６，６の一側端部６ａ，６ａ，６ａと他の側端部６ｂ，６ｂ，６ｂが（６ａ，６ａ，６ｂ）又は（６ａ，６ｂ，６ｂ）の組み合わせで重ね合わせ、この組み合わせで重ね合わせた部位をコンクリート釘８で一次覆工コンクリート１１側に固定すると共に、３つの防水シート５，５，５の不透水性シート７，７，７の一側端部７ａ，７ａ，７ａと他の側端部７ｂ，７ｂ，７ｂが（７ａ，７ａ，７ｂ）又は（７ａ，７ｂ，７ｂ）の組み合わせで重ね合わせるか又は近接させ、該不透水性シートの側端部（７ａ，７ａ，７ｂ）又は（７ａ，７ｂ，７ｂ）の組み合わせの重ね合わせた部位又は近接させた部位に前記接合用シート１又は１’の熱可塑性樹脂層２側を対向させて重ねると共に、該接合用シート１又は１’の耐熱層３側からアイロンなどの加熱機９のコテ１０で加熱加圧し、３つの不透水性シートの側端部（７ａ，７ａ，７ｂ）又は（７ａ，７ｂ，７ｂ）に該接合用シート１又は１’の熱可塑性樹脂２を熱融着することによって接合する方法とすることができる。
４つの防水シートの接合構造については、トンネル地山、一次覆工コンクリート１１の面に、４つの防水シート５，５，５，５の透水性シート６，６，６，６側の面が対向するように配設し、４つの防水シート５，５，５，５の透水性シート６，６，６，６の一側端部６ａ，６ａ，６ａ，６ａと他の側端部６ｂ，６ｂ，６ｂ，６ｂが（６ａ，６ａ，６ｂ，６ｂ）の組み合わせで重ね合わせ、この組み合わせで重ね合わせた部位をコンクリート釘８で一次覆工コンクリート１１側に固定すると共に、４つの防水シート５，５，５，５の不透水性シート７，７，７，７の一側端部７ａ，７ａ，７ａ，７ａと他の側端部７ｂ，７ｂ，７ｂ，７ｂが（７ａ，７ａ，７ｂ，７ｂ）の組み合わせで重ね合わせるか又は近接させ、該不透水性シートの側端部（７ａ，７ａ，７ｂ，７ｂ）の組み合わせの重ね合わせた部位又は近接させた部位に前記接合用シート１又は１’の熱可塑性樹脂層２側を対向させて重ねると共に、該接合用シート１又は１’の耐熱層３側からアイロンなどの加熱機９のコテ１０で加熱加圧し、４つの不透水性シートの側端部（７ａ，７ａ，７ｂ，７ｂ）に該接合用シート１又は１’の熱可塑性樹脂２を熱融着することによって接合する方法とすることができる。
（図５（Ａ），（Ｂ）を参照されたい。） As mentioned above, although the joining method of the two waterproof sheets 5 and 5 which applied the joining structure of the waterproof sheet which concerns on one structural example of this invention was described, also about the joining method of three or more waterproof sheets, the sheet | seat for joining A similar joining method by 1 or 1 ′ can be used.
That is, for the method of joining the three waterproof sheets, the surfaces of the three waterproof sheets 5, 5, and 5 on the side of the water-permeable sheets 6, 6, and 6 face the tunnel ground and the surface of the primary lining concrete 11. The one side end portions 6a, 6a, 6a and the other side end portions 6b, 6b, 6b of the three waterproof sheets 5, 5, 5 are (6a, 6a, 6b) or a combination of (6a, 6b, 6b), and the part overlapped by this combination is fixed to the primary lining concrete 11 side with a concrete nail 8, and the three waterproof sheets 5, 5, 5 are One side end portions 7a, 7a, 7a of the water-permeable sheets 7, 7, 7 and the other side end portions 7b, 7b, 7b are overlapped by a combination of (7a, 7a, 7b) or (7a, 7b, 7b). Or the side end of the water-impermeable sheet (7a 7a, 7b) or a combination of (7a, 7b, 7b), and the thermoplastic resin layer 2 side of the bonding sheet 1 or 1 'is opposed to and overlapped with the overlapped part or the adjacent part. Heat and press with the iron 10 of the heating machine 9 such as an iron from the heat-resistant layer 3 side of the sheet 1 or 1 ′, and the side end portions (7a, 7a, 7b) or (7a, 7b, 7b) of the three water-impermeable sheets It can be set as the method of joining by heat-seal | fusing the thermoplastic resin 2 of this sheet | seat 1 or 1 'for joining.
Regarding the joint structure of the four waterproof sheets, the surface of the four waterproof sheets 5, 5, 5, and 5 on the side of the water permeable sheets 6, 6, 6, and 6 faces the tunnel ground and the surface of the primary lining concrete 11. The four water-proof sheets 5, 5, 5 and 5 are provided with one side end portions 6a, 6a, 6a and 6a and the other side end portions 6b and 6b. , 6b, 6b are superposed by a combination of (6a, 6a, 6b, 6b), and the part superposed by this combination is fixed to the primary lining concrete 11 side with concrete nails 8 and four waterproof sheets 5, 5 , 5 and 5 of one side end portions 7a, 7a, 7a and 7a and other side end portions 7b, 7b, 7b and 7b (7a, 7a, 7b and 7b). ) Are combined or brought close together, and the side edge of the water-impermeable sheet 7a, 7a, 7b, and 7b) are superposed on the superposed part or the part close to each other so that the thermoplastic resin layer 2 side of the joining sheet 1 or 1 'is opposed to each other, and the joining sheet 1 or 1 The heat-resistant layer 3 side is heated and pressed with the iron 10 of a heating machine 9 such as an iron, and the bonding sheet 1 or 1 'is attached to the side end portions (7a, 7a, 7b, 7b) of the four water-impermeable sheets. It can be set as the method of joining by heat-seal | fusing the thermoplastic resin 2. FIG.
(Refer to FIGS. 5A and 5B.)

いずれにせよ、本発明の防水シートの接合構造は、従来用いられる自動溶接機では接合が困難な部位に有効に適用され、複数の不透水性シートの重ね合わせ又は近接部位に前記接合用シートの熱可塑性樹脂層側が対向、重ねられ、複数の該防水シートの不透水性シートの重ね合わせ又は近接部位に該接合用シートの熱可塑性樹脂層が熱融着されてなる漏水防止構造であり、その接合方法は、特に複数の防水シートの不透水性シートの側端部同士を重ね合わせ又は近接すると共に、上記接合用シートを用いて、該重ね合わせ又は近接部位に前記接合用シートの熱可塑性樹脂層側を対向、重ねると共に、該接合用シートの耐熱層側から加熱機で加熱、加圧することにより、少なくとも接合用シートの熱可塑性樹脂層を溶融、流動化させて、複数の該防水シートの不透水性シートの重ね合わせ又は近接部位に該接合用シートを熱融着し、接合する簡便で確実なものである。
しかも、かかる本発明に採用される接合用シートは、低融点の熱可塑性樹脂層２と、これより高融点の耐熱層（と必要に応じ接着層）とが公知のラミネート技術に基づき、一体にラミネートされているので、各層の厚さも一体ラミネート後の厚さのバラツキも極めて小さく、結果として該接合用シート１又は１’を用い、自動溶接機では防水シートの、特に不透水性シート側端部同士の接合ができない部位を補修する際も本シート１枚のみで扱い易く、該熱可塑性樹脂層は、容易に不透水性シートの側端部の重ね合わせ又は近接部位の不透水性シート層に熱融着し、接合することができる簡便さと作業性の良さを備えたもので、しかも接着品質（接着強度，接着耐久性など）が変動しにくい高品質なものである。
なお、上述の加熱機にかえて、熱風ガンと加圧ゴテを用いても何ら問題なく、本発明と同様な作用効果を奏することができる。また、その他の構成についても本発明の要旨を逸脱しない範囲で種々変更して差支えない。 In any case, the joining structure of the waterproof sheet of the present invention is effectively applied to a part that is difficult to join by a conventional automatic welding machine, and a plurality of water-impermeable sheets are overlapped or adjacent to each other. The thermoplastic resin layer side is opposed and overlapped, and is a water leakage preventing structure in which the water-impermeable sheet of the plurality of waterproof sheets is overlapped or the thermoplastic resin layer of the bonding sheet is heat-sealed in the vicinity of the waterproof sheet. In particular, the bonding method is such that the side ends of the water-impermeable sheets of a plurality of waterproof sheets are overlapped or close to each other, and the bonding sheet is used to connect the thermoplastic resin of the bonding sheet to the overlapping or adjacent portion. At the same time, the layer sides face each other and overlap, and by heating and pressurizing with a heater from the heat-resistant layer side of the bonding sheet, at least the thermoplastic resin layer of the bonding sheet is melted and fluidized. Heat-sealed to the bonding sheet in superposition or proximity portion of the impermeable sheet of the waterproof sheet, but simple and reliable joining.
In addition, the bonding sheet employed in the present invention is composed of a thermoplastic resin layer 2 having a low melting point and a heat-resistant layer having a higher melting point (and an adhesive layer if necessary) based on a known laminating technique. Since it is laminated, the thickness of each layer and the variation in thickness after integral lamination are extremely small. As a result, the joining sheet 1 or 1 ′ is used, and in the automatic welding machine, the waterproof sheet, particularly the side of the impervious sheet side Even when repairing a part where the parts cannot be joined, it is easy to handle with only one sheet, and the thermoplastic resin layer is easily superposed on the side edge part of the water-impermeable sheet or the water-impermeable sheet layer in the adjacent part. It is easy to heat-bond and can be joined, and has good workability, and it is a high-quality one whose adhesion quality (adhesion strength, adhesion durability, etc.) does not easily fluctuate.
In addition, even if it uses a hot air gun and a pressurization iron instead of the above-mentioned heating machine, there can be no problem and the same effect as this invention can be show | played. Also, other configurations may be variously changed without departing from the gist of the present invention.

（Ａ）は本発明の一構成例に採用される接合用シート１を示す断面図であり、（Ｂ）は他の接合用シート１’を示す断面図である。(A) is sectional drawing which shows the sheet | seat 1 for joining employ | adopted as one structural example of this invention, (B) is sectional drawing which shows other sheet | seats 1 'for joining. 本発明の一構成例に採用される防水シート５を示す断面図である。It is sectional drawing which shows the waterproof sheet 5 employ | adopted as one structural example of this invention. 本発明の一構成例に係る防水シート５，５の接合部位を説明する斜視図である。It is a perspective view explaining a joined part of waterproof sheets 5 and 5 concerning one example of composition of the present invention. （Ａ）は図３の防水シート５，５を一点鎖線Ｘ₁に沿って該防水シート５，５面に垂直に切断した断面図であり、（Ｂ）は図３の防水シート５，５を一点鎖線Ｘ₂に沿って該防水シート５，５面に垂直に切断した断面図であり、そして（Ｃ）は図３の防水シート５，５を一点鎖線Ｘ₃に沿って該防水シート５，５面に垂直に切断した断面図である。(A) is a sectional view taken perpendicularly to the waterproof sheet 5 and 5 sides along the waterproof sheet 5 and 5 the dashed line X ₁ in FIG. 3, the waterproof sheet 5 and 5 (B) is 3 FIG. 6 is a cross-sectional view taken perpendicularly to the surface of the waterproof sheets 5 and 5 along the alternate long and short dash line X ₂ , and (C) shows the waterproof sheets 5 and 5 in FIG. 3 along the alternate long and short dash line X ₃ . It is sectional drawing cut | disconnected perpendicularly to 5 surfaces. 本発明に係る防水シートの特に不透水性シートの平面図を示しており、（Ａ）は不透水性シートの３枚重ねを、（Ｂ）は不透水性シートの４枚重ねを示す平面図である。The top view of the water-impermeable sheet especially the water-impermeable sheet which concerns on this invention is shown, (A) is 3 sheet | seats of a water-impermeable sheet, (B) is a top view which shows 4 sheet | seats of a water-impermeable sheet It is.

Explanation of symbols

１接合用シート
２熱可塑性樹脂層
３耐熱層
４接着層
５防水シート
６透水性シート
６ａ透水性シートの一側端部
６ｂ透水性シートの他の側端部
７不透水性シート
７ａ不透水性シートの一側端部
７ｂ不透水性シートの他の側端部
８コンクリート釘
９加熱機
１０コテ DESCRIPTION OF SYMBOLS 1 Sheet | seat for joining 2 Thermoplastic resin layer 3 Heat-resistant layer 4 Adhesive layer 5 Waterproof sheet 6 Water-permeable sheet 6a One side edge part 6b of a water-permeable sheet Other side edge part 7 of a water-permeable sheet Water-impermeable sheet 7a Water-impermeable sheet One side edge 7b of sheet Other side edge 8 of impervious sheet Concrete nail 9 Heating machine 10 Iron

Claims

The side edges of the plurality of water-impermeable sheets are joined together by a joining sheet composed of at least a thermoplastic resin layer that can be heat-sealed to the water-impermeable sheet and a heat-resistant layer having a higher melting point. Waterproof sheet joining structure characterized by

The waterproof sheet joining structure according to claim 1, wherein the thermoplastic resin layer is made of an ethylene-vinyl acetate copolymer containing 16 to 50% by mass of vinyl acetate.

The waterproof sheet joining structure according to claim 1, wherein the thermoplastic resin layer is made of a modified polyolefin in which a polar group is graft-polymerized in an amount of 3 to 50% by mass.

The waterproof sheet bonding structure according to claim 1, wherein the heat-resistant layer is made of a metal foil.

Applying the joining structure according to any one of claims 1 to 4, the side end portions of a plurality of water-impermeable sheets are overlapped or brought close together, The bonding sheet is overlapped with the thermoplastic resin layer facing each other, heated and pressurized from the heat-resistant layer side, and the thermoplastic resin of the bonding sheet is heat-sealed to the side edges of the plurality of water-impermeable sheets. The joining method of the waterproof sheet characterized by joining by.