JP2021032052A - コンクリート片の落下を防止する落下防止方法およびコンクリート片落下防止用フッ素ゴムシート - Google Patents
コンクリート片の落下を防止する落下防止方法およびコンクリート片落下防止用フッ素ゴムシート Download PDFInfo
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Images
Landscapes
- Working Measures On Existing Buildindgs (AREA)
- Laminated Bodies (AREA)
- Bridges Or Land Bridges (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
Description
本開示の落下防止方法において、前記フッ素ゴムシートの1m2あたりの重量が5kg以下であり、前記フッ素ゴムシートの押し抜き荷重が1.5kN以上であることが好ましい。
本開示の落下防止方法において、前記コンクリート構造体の表面に、前記フッ素ゴムシートをアンカーにより固定することが好ましい。
本開示のコンクリート片落下防止用フッ素ゴムシートは、1m2あたりの重量が5kg以下であり、押し抜き荷重が1.5kN以上であることが好ましい。
CF2=CFO(CF2CFX4O)p−(CF2CF2CF2O)q−Rf2
(式中、X4はFまたはCF3を表し、Rf2は炭素数1〜5のパーフルオロアルキル基を表す。pは0〜5の整数を表し、qは0〜5の整数を表す。)で表される化合物、および、一般式:
CFX=CXOCF2OR1
(式中、Xは、同一または異なり、H、FまたはCF3を表し、R1は、直鎖または分岐した、H、Cl、BrおよびIからなる群より選択される少なくとも1種の原子を1〜2個含んでいてもよい炭素数が1〜6のフルオロアルキル基、若しくは、H、Cl、BrおよびIからなる群より選択される少なくとも1種の原子を1〜2個含んでいてもよい炭素数が5または6の環状フルオロアルキル基を表す。)で表される化合物からなる群より選択される少なくとも1種が好ましい。
R2IxBry
(式中、xおよびyはそれぞれ0〜2の整数であり、かつ1≦x+y≦2を満たすものであり、R2は炭素数1〜16の飽和もしくは不飽和のフルオロ炭化水素基またはクロロフルオロ炭化水素基、または炭素数1〜3の炭化水素基であり、酸素原子を含んでいてもよい)で表される化合物があげられる。臭素化合物またはヨウ素化合物を使用することによって、ヨウ素または臭素が重合体に導入され、架橋点として機能する。
臭素化合物またはヨウ素化合物としては、たとえば、モノヨードメタン、1−ヨードエタン、1−ヨード−n−プロパン、1−ヨードパーフルオロプロパン、2−ヨードパーフルオロプロパン、1−ヨード−パーフルオロブタン、1−ヨード−パーフルオロペンタン、1−ヨード−パーフルオロヘキサン、1,3−ジヨードパーフルオロプロパン、1,3−ジヨード−2−クロロパーフルオロプロパン、1,4−ジヨードパーフルオロブタン、1,5−ジヨード−2,4−ジクロロパーフルオロペンタン、1,6−ジヨードパーフルオロヘキサン、1,8−ジヨードパーフルオロオクタン、1,12−ジヨードパーフルオロドデカン、1,16−ジヨードパーフルオロヘキサデカン、ジヨードメタン、1,2−ジヨードエタン、1,3−ジヨード−n−プロパン、CF2Br2、BrCF2CF2Br、CF3CFBrCF2Br、CFClBr2、BrCF2CFClBr、CFBrClCFClBr、BrCF2CF2CF2Br、BrCF2CFBrOCF3、1−ブロモ−2−ヨードパーフルオロエタン、1−ブロモ−3−ヨードパーフルオロプロパン、1−ブロモ−4−ヨードパーフルオロブタン、2−ブロモ−3−ヨードパーフルオロブタン、3−ブロモ−4−ヨードパーフルオロブテン−1、2−ブロモ−4−ヨードパーフルオロブテン−1、ベンゼンのモノヨードモノブロモ置換体、ジヨードモノブロモ置換体、ならびに(2−ヨードエチル)および(2−ブロモエチル)置換体などがあげられ、これらの化合物は、単独で使用してもよく、相互に組み合わせて使用することもできる。
19F−NMR(Bruker社製AC300P型)を用いて測定した。
19F−NMRにて測定されたフッ素ゴムの組成から計算によって求めた。
示差走査熱量計(メトラー・トレド社製、DSC822e、もしくは、日立テクノサイエンス社製、X−DSC823e)を用い、試料10mgを10℃/分で昇温することによりDSC曲線を得て、DSC曲線の二次転移前後のベースラインの延長線と、DSC曲線の変曲点における接線との交点を示す温度をガラス転移温度とした。
ASTM D−2683に従い測定した。フッ素ゴムの限界酸素指数が大きいほど、フッ素ゴムの難燃性が優れることを意味する。
土木工事標準仕様書(JR東日本編)、平成30年度改訂版、「付属書17−2 コンクリート表面被覆工法の試験方法 (8)押し抜き荷重試験」に従って実施し、コンクリート片落下防止用フッ素ゴムシートの押し抜き荷重を測定した。押し抜き荷重試験では、接着剤(商品名「TB2002K、TB2102B」、株式会社スリーボンド製)を4:1の混合比率で用いて、コンクリート片落下防止用フッ素ゴムシートを、供試体用基板(上ぶた式U形側溝(ふた))に貼り付けた。
土木工事標準仕様書(JR東日本編)、平成30年度改訂版、「付属書17−2 コンクリート表面被覆工法の試験方法 (9)ひび割れ追従性試験」に従って実施し、コンクリート片落下防止用フッ素ゴムシートのひび割れ追従性を測定した。ひび割れ追従性試験では、接着剤(商品名「TB2002K、TB2102B」、株式会社スリーボンド製)を4:1の混合比率で用いて、コンクリート片落下防止用フッ素ゴムシートを、モルタル供試体に貼り付けた。
以下の物性を有するフッ素ゴムを用いた。
フッ素ゴムA
フッ化ビニリデン/ヘキサフルオロプロピレン共重合体
フッ化ビニリデン/ヘキサフルオロプロピレンのモル比:78/22(モル%)
フッ素含有率:66質量%
ガラス転移温度:−19℃
限界酸素指数:75容積%
11 フッ素ゴム層
20 多層のコンクリート片落下防止用フッ素ゴムシート
21 繊維補強層
31 コンクリート構造体
31a コンクリート構造体の表面
32 施工目地部
32a 継ぎ目
32b 空隙
33 埋め込み式アンカーピン
Claims (7)
- コンクリート構造体の表面に、フッ素含有率が55〜71質量%のフッ素ゴムを含有するフッ素ゴムシートを設置することにより、前記コンクリート構造体からのコンクリート片の落下を防止する落下防止方法。
- 前記フッ素ゴムシートが、前記フッ素ゴムを含有するフッ素ゴム層および繊維補強層を備える請求項1に記載の落下防止方法。
- 前記フッ素ゴムシートの1m2あたりの重量が5kg以下であり、前記フッ素ゴムシートの押し抜き荷重が1.5kN以上である請求項1または2に記載の落下防止方法。
- 前記コンクリート構造体の表面に、前記フッ素ゴムシートをアンカーにより固定する請求項1〜3のいずれかに記載の落下防止方法。
- フッ素含有率が55〜71質量%のフッ素ゴムを含有するコンクリート片落下防止用フッ素ゴムシート。
- 前記フッ素ゴムを含有するフッ素ゴム層および繊維補強層を備える請求項5に記載のコンクリート片落下防止用フッ素ゴムシート。
- 1m2あたりの重量が5kg以下であり、押し抜き荷重が1.5kN以上である請求項5または6に記載のコンクリート片落下防止用フッ素ゴムシート。
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JPH0849498A (ja) * | 1994-08-09 | 1996-02-20 | Sumitomo Rubber Ind Ltd | トンネル補修用シートとそれを用いたトンネル補修方法 |
JPH10204189A (ja) * | 1997-01-17 | 1998-08-04 | Mitsubishi Plastics Ind Ltd | フッ素樹脂シート及び合わせガラス |
JPH11206556A (ja) * | 1998-01-26 | 1999-08-03 | Mitsubishi Plastics Ind Ltd | フッ素樹脂系カーテン素材 |
JP2004084411A (ja) * | 2002-08-29 | 2004-03-18 | East Japan Railway Co | コンクリート表面の補修構造およびコンクリート表面の補修方法 |
JP2017014835A (ja) * | 2015-07-03 | 2017-01-19 | 東レ・デュポン株式会社 | 建築土木資材補強用複合シートおよび建築土木資材 |
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JPH0849498A (ja) * | 1994-08-09 | 1996-02-20 | Sumitomo Rubber Ind Ltd | トンネル補修用シートとそれを用いたトンネル補修方法 |
JPH10204189A (ja) * | 1997-01-17 | 1998-08-04 | Mitsubishi Plastics Ind Ltd | フッ素樹脂シート及び合わせガラス |
JPH11206556A (ja) * | 1998-01-26 | 1999-08-03 | Mitsubishi Plastics Ind Ltd | フッ素樹脂系カーテン素材 |
JP2004084411A (ja) * | 2002-08-29 | 2004-03-18 | East Japan Railway Co | コンクリート表面の補修構造およびコンクリート表面の補修方法 |
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