The most used waterproofing membrane sheet for tunnel in Japan
SG-sheet
waterproofing membrane sheet for tunnel
SG-sheet, a waterproofing membrane sheet for tunnels, has been used by many customers in all types of NATM tunnels. Our quality have always been top class in Japan, and among them, SG-sheet has been supported by many customers.
Product Description
商品説明
■features
The waterproof layer (sheet) is composed of two layers, a white layer (inner side) and a black layer (ground side), so that if the white layer is damaged, the black layer inside the sheet will appear, allowing the damaged area to be seen and detected. This improves the quality of the waterproof sheet and reduces the risk of water leakage even in tunnel construction environments where it is difficult to distinguish damaged areas. This is more effective in areas where damage is more likely to occur, such as in sections where the lining rebar is easily damaged.
In combination with the “Standard Specifications (FF208XHU-SG),” the “High Drainage Type,” “Wide Separately Attached Type,” and “W-Barrier (double-welded) Type” can be manufactured as a single unit, and their features can be further combined to further enhance waterproof quality.
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■Standard / Shape
¶ Material
EVA is the main material, and conforms to the waterproofing sheet standards of each ordering party.
¶ Standards
The waterproofing layer is manufactured and sold according to the standard specifications for standard areas and for cold climates.
The permeable layer is made of long-fiber non-woven fabric and can be changed according to the ground conditions. In sites with high groundwater inflow, a high drainage type permeable layer can be used to reduce the water pressure on the backside of the lining.
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PET Substrate Protection Film
It is used in a wide range of applications from optical film applications such as polarizing plates for LCDs to surface protection for smartphones and tablets, and we can provide a lineup of products with quality tailored to each application.
High transparency and clean environment minimize defects and contribute to process improvement and yield enhancement, such as visual inspection in the laminated state.
High drainage type (PHU type)
The three-layered structure of the waterproof sheet, with a three-dimensional mesh laminated to the back of the permeable layer, makes it possible to be used in tunnels with large water inflow. The drainage capacity is 40 times higher than that of the standard permeable layer, and the structure can withstand the pressure of concrete placement.However, if water inflow is confirmed over a large area or if there is concern about future water inflow, a high drainage type waterproof sheet will be used to conduct water over the surface of the tunnel. This also applies to cases where there is concern that the nonwoven fabric may become clogged with free lime over time.
If there is an imbalance between the amount of water inflow and the amount of drainage, water pressure may be applied to the lining concrete, causing it to crack, etc. This is also an important part of the tunnel's long-term durability.
●Performance test (hydraulic conductivity)
It has excellent compression resistance, impact resistance, and flexibility, and demonstrates excellent drainage functionality under severe conditions. It is effective in preventing cracks and more economical than using drainage materials in combination.
Olefin base protective film
This product has a wide range of applications as a surface protection film for various materials.
We can provide PP or PE base material coated with various adhesives such as acrylic or rubber adhesive, or resin coated type without adhesive.
Various variations are available, including a transparent type that is convenient for inspection after lamination.
寒冷地仕様（寒冷地用／断熱吹付用）
寒冷地仕様は、主に北海道内のトンネル工事に適用されるシートです。北海道開発局の材料規格に合格するEVAシートを採用し、氷点下環境でもシートの柔軟性を担保しております。また、北海道特有の断熱区間でも使用できる断熱吹付用もラインナップしております。寒冷地用防水シートはEVAシート材質以外は標準仕様と同様の構造です。他タイプとの組合せも可能です。断熱吹付タイプの寒冷地用防水シートは、シート最内面に不織布を貼合する事で、吹付断熱ウレタンとの付着性を向上させています。溶着部のたるみによる断熱吹付施工への影響も最小限にする工夫を施しております。●表面不織布＋EVAシート＋不織布
自己粘着保護フィルム
光学用フィルムや機能性樹脂板などの被着体に糊残りなく表面を保護することができるフィルムです。
ポリエチレン系からなる自己粘着性表面保護フィルムです。各種光学フィルム製造時の工程用や、その他プラスチック板の表面保護フィルムとして使用されます。