JP4181884B2 - Waterproof pavement construction method and structure of floor slab - Google Patents

Waterproof pavement construction method and structure of floor slab Download PDF

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Publication number
JP4181884B2
JP4181884B2 JP2003023410A JP2003023410A JP4181884B2 JP 4181884 B2 JP4181884 B2 JP 4181884B2 JP 2003023410 A JP2003023410 A JP 2003023410A JP 2003023410 A JP2003023410 A JP 2003023410A JP 4181884 B2 JP4181884 B2 JP 4181884B2
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adhesive layer
waterproof
pavement
hot
adhesive
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JP2004092373A (en
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宗人 浦谷
友章 杉山
康成 瀬濤
哲哉 柑本
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、主として橋梁の鉄筋入りコンクリート製床版や鋼床版等のように、施工用車両等の走行に伴う衝撃荷重や繰り返し応力、さらには雨水浸透による腐食などから床版を保護してその供用耐久性を長期に亘り維持することが要求されているような床版の防水舗装施工法及びその構造に関するものである。
【0002】
【従来の技術】
橋梁等の床版の防水舗装施工法として、従来一般には、床版上にゴム系防水シートを熱溶融接着し、この防水シート上にアスファルト表層舗装体を舗設するシート防水舗装施工法あるいは床版上にゴム溶剤型塗料を塗布して防水性塗膜を形成し、この塗膜上にアスファルト表層舗装体を舗設する塗膜防水舗装施工法が主流であった。
【0003】
しかし、上記した従来一般のシート防水舗装施工法では、床版と防水シートの間に膨れ等の欠陥が発生したり、施工効率の悪さから一日の施工面積が制約される等の多くの難点があり、また、塗膜防水舗装施工法では、塗布及び養生を数回繰り返すことが必要で施工効率が非常に悪いだけでなく、塗膜による防水層に膨れ等の欠陥が発生し易い等の難点があり、いずれの施工法も施工性及び防水面での信頼性、さらには施工用車両等の走行に伴う衝撃荷重や繰り返し応力に対する耐応強度に欠け、供用耐久性の長期維持という要求を達成することができず、短期間の供用サイクルで全面的に補修しなければならないという問題があった。
【0004】
このような多くの問題を有する従来一般の床版の防水舗装施工法に代わるものとして、従来、床版上に防水層を形成し、この防水層上に、ビーズ、ペレット、ピレット、チップ等の各種形状を持つ熱可塑性樹脂粒子を散布したのち、この熱可塑性樹脂粒子上に加熱アスファルト舗装体を施すことにより、該加熱アスファルト舗装体の熱で熱可塑性樹脂粒子を溶融させて上記防水層とアスファルト舗装体とを接着する接着層を形成させる床版の防水舗装施工法が提案されている(例えば特許文献1参照)。
【0005】
【特許文献1】
特開平3−93904号公報
【0006】
上記した従来の床版の防水舗装施工法によれば、軽量で施工が非常に容易であり、かつ、常温で安全に取扱える熱可塑性樹脂粒子を防水層上に散布し、その上に加熱アスファルト舗装体を施すだけでよいから、所定の防水舗装を効率よく施工することができる。また、アスファルト舗装体の熱で溶融された熱可塑性樹脂がアスファルト舗装体の隙間部及び防水層の損傷部に隙間なく浸透し充填するアンカー効果により、防水層とアスファルト舗装体との接着性の向上が図れて膨れ等の欠陥の発生を防止できるとともに、防水層をシームレスなものとして優れた防水性能を確保し雨水浸透による床版の腐食等を防止できる。さらに、施工時における重機等の施工用車両の通行に際して防水層にかかる荷重を熱可塑性樹脂粒子により分散させて防水層の損傷、破壊を抑制でき橋梁等の床版の供用耐久性の長期維持を達成することができるという利点を有している。
【0007】
【発明が解決しようとする課題】
ところで、シート防水舗装など従来一般の床版の防水舗装施工法が有する問題点の解消に成功した上記従来の床版の防水舗装施工法において、防水層上に散布して用いられる多量の粉粒状又はペレット状の熱溶融接着剤は、容器内に貯蔵して保管され、その容器内への保管状態のままで施工現場に輸送され、施工現場で散布使用されていたが、夏場のように外気温が高い条件下では、容器内温度の昇温に伴い熱溶融接着剤の表面の一部が溶けて相互に接合一体化するブロッキング現象を呈しやすい。このようにブロッキングした熱溶融接着剤は散布作業そのものが困難になるばかりでなく、防水層上に散布したとき、局所的に接着剤の塊ができるなど散布密度が不均等となり、その結果、加熱アスファルト舗装体の熱で溶融流動されて形成される接着層の厚みにばらつきが生じて防水層とアスファルト舗装体との接着性が不均一、不安定となって防水性能の面で高い信頼性を得ることができないという問題が残されていた。
【0008】
本発明は上記実情に鑑みてなされたもので、粉粒状又はペレット状の熱溶融接着剤の保管や輸送時におけるブロッキングの発生を確実に防ぎ、散布作業を容易にして施工効率の向上を維持しつつ、舗装面全面に亘って均一かつ安定よい接着性能及び防水性能を確保して床版の供用耐久性の長期維持を達成することができる床版の防水舗装施工法及びその構造を提供することを目的としている。
【0009】
【課題を解決するための手段】
上記目的を達成するために、本発明の請求項1に係る床版の防水舗装施工法は床版上に常温硬化型液状樹脂を塗布して接着層を形成する工程と、この接着層上に速硬化型液状樹脂を塗布して防水層を形成する工程と、この防水層上に柔軟性樹脂接着剤を塗布して一次接着層を形成する工程と、この一次接着層上に粉粒状又はペレット状の熱溶融接着剤を散布する工程と、この粉粒状又はペレット状の熱溶融接着剤上に加熱アスファルト舗装体を舗設して該加熱アスファルト舗装体の熱で上記熱溶融接着剤を溶融流動させて上記一次接着層とアスファルト舗装体との間に両者を接着する二次接着層を形成する工程とを有する床版の防水舗装施工法であって、上記一次接着層上に散布される粉粒状又はペレット状の熱溶融接着剤には、これら熱溶融接着剤の融点よりも高い融点を持つパウダーが混入されているものを使用することを特徴とするものである。
【0010】
また、上記と同一の目的を達成するために、本発明の請求項3に係る床版の防水舗装構造は、床版上に形成された常温硬化型液状樹脂からなる接着層と、この接着層上に速硬化型液状樹脂を塗布して形成された防水層と、この防水層上に柔軟性樹脂接着剤を塗布して形成された一次接着層と、この一次接着層上に粉粒状又はペレット状の熱溶融接着剤を散布して形成される二次接着層と、この二次接着層上に舗設された加熱アスファルト舗装体とからなり、上記二次接着層が加熱アスファルト舗装体の熱で粉粒状又はペレット状の熱溶融接着剤を溶融流動されることにより形成されている床版の防水舗装構造であって、上記一次接着層上に散布される粉粒状又はペレット状熱溶融接着剤として、これら熱溶融接着剤の融点よりも高い融点を持つパウダーが混入されたものを使用していることを特徴とするるものである。
【0011】
上記請求項1に記載の本発明に係る床版の防水舗装施工法並びに請求項3に記載の本発明に係る床版の防水舗装構造によれば、いずれも防水層上または一次接着層上に散布して用いられる粉粒状又はペレット状の熱溶融接着剤として、これら熱溶融接着剤の融点よりも高い融点を持つパウダーが混入されたものを使用するために、これら粉粒状又はペレット状の熱溶融接着剤を容器内に貯蔵し保管している時や、容器内への保管状態のままで施工現場に輸送する時は各粉粒状又はペレット状熱溶融接着剤の間に高融点パウダーが介在されていることになり、高温雰囲気下で保管されたり、外気温の高い夏場のような高温雰囲気下で輸送されたりする場合でも、熱溶融接着剤の表面の一部が溶けて相互に接合一体化するブロッキング現象の発生を防ぐことが可能である。したがって、熱溶融接着剤を粉粒状又はペレット状のままに保って防水層または一次接着層上への散布作業が容易であるばかりでなく、局所的な接着剤の塊等を生じることなく防水層または一次接着層の全面にわたりほぼ均等な密度で散布することが可能であり、その結果、加熱アスファルト舗装体の熱で溶融流動されて形成される接着層の厚みが均一で防水層とアスファルト舗装体との接着性を良好かつ安定化して防水性能の面で高い信頼性を確保し、施工用車両の走行に伴う衝撃荷重や繰り返し応力に対する防水層の損傷、破壊防止効果と相俟って橋梁等の床版の供用耐久性の長期に亘り安定維持することができる。
【0012】
上記した本発明の床版の防水舗装施工法及びその構造において、上記高融点パウダーの混入割合としては、粉粒状又はペレット状の熱溶融接着剤に対して1:99〜99:1の重量割合であればよいが、好ましくは、20:80〜90:10の重量割合であって、それ以上になると、加熱アスファルト舗装体の熱による溶融流動性が低下し、また、それ以下になると、ブロッキング防止の確実性に欠ける。
【0013】
以下、本発明において使用される材料について詳細に説明する。
請求項1及び請求項3のように、床版上に塗布して接着層を形成する常温硬化型液状樹脂としては、ウレタン系、エポキシ系、MMA系、エピスルフィド系のものが用いられる。その中でもNCO%:5〜35%の芳香族イソシアネートを用いたウレタン樹脂の使用が好ましく、また、その接着層は乾燥面であってもよいが、湿潤面であることが望ましい。
【0014】
防水層を形成する速硬化型液状樹脂としては、ウレタン樹脂、ウレア樹脂、ウレアウレタン樹脂のいずれかを使用し、これに硬化剤を混合した2液混合型のものが好ましい。ここで、主剤となる樹脂は、4−4−ジフェニルメタンジイソシアネート、ポリフェニルメチレンポリイソシアネート、カルボジイミド変性ジフェニルメタンジイサシアネート等のポリイソシアネート化合物または4−4−ジフェニルメタンジイソシアネートとポリオールとの反応物であるイソシアネート基末端プレポリマーが好ましく、また、硬化剤としては、ポリエーテル系ポリオールと芳香族ポリアミンを混合した変性品が好ましい。
【0015】
上記のような主剤及び硬化剤を使用する2液混合可速硬化型液状樹脂は、引張伸度が100%以上、好ましくは300%以上となり、塗布後の硬化速度は3時間以内、好ましくは1時間以内になるという特長を有している。
【0016】
請求項1及び請求項3にように、防水層の上に一次接着層を形成する柔軟性樹脂接着剤としては、ウレタン変性樹脂又は1液型もしくは2液型のウレタン樹脂を使用する。
【0017】
また、防水層または一次接着層の上に散布され、アスファルト舗装材の舗設時に該加熱アスファルト舗装体の熱で溶融流動されて上記防水層または一次接着層とアスファルト舗装体との間に接着層を形成する粉粒状又はペレット状の熱溶融接着剤としては、ポリウレタン系、ポリオレフィン系、ポリエステル系、ポリアミド系、エチレンエチルアクリレート(EEA)、エチレンビニルアセテート(EVA)、スチレンブチレンエラストマー(SBS)の中から選択された一種または複数種で、融点が50℃以上、引張伸度が100%以上、好ましくは300%以上の繰り返し衝撃性に優れた材料を使用することが望ましい。
【0018】
さらに、粉粒状又はペレット状の熱溶融接着剤のブロッキング防止のために混入する高融点パウダーとしては、硅砂、タルク、炭酸カルシウム、シリカ等の無機質フィラーあるいはオレフィン、パラフィン、ワックス、ロジン、テルペン、エポキシ、エチレンエチルアクリレート(EEA)、エチレンビニルアセテート(EVA)等の有機質樹脂の中から選択された一種又は複数種を使用する。
【0019】
【発明の実施の形態】
以下、本発明の実施の形態を図面にもとづいて説明する。
図1は本発明の請求項1に係る床版の防水舗装施工法により完工された請求項6に係る床版の防水舗装構造を示す要部の縦断面図であり、橋梁等の鉄筋入りコンクリート製又は鋼製の床版1上には、0.05〜1mm、好ましくは0.1〜0.5mm厚さの湿潤面接着層2が施されており、この湿潤接着層2上に、2液混合可撓性速硬化型液状樹脂を塗布して0.5〜5mm、好ましくは1.5〜3.5mm厚さの防水層3が形成されている。この防水層3の上には、後述する柔軟性樹脂接着剤により形成される一次接着層4A及び粉粒状又はペレット状熱溶融接着剤の溶融流動により形成される二次接着層4Bからなり、0.5〜2mm、好ましくは1〜1.5mm厚さの舗装接着層4が形成されており、この舗装接着層4上に加熱アスファルト舗装体5を舗設することで、該加熱アスファルト舗装体5と防水層3とが舗装接着層4により接着されている。なお、上記接着層2は、湿潤面であることが望ましいが、乾燥面であってもよい。
【0020】
次に、上記構成を持つ床版の防水舗装構造の施工法について工程順に詳しく説明する。
床版1上に、図2に示すように、既述した常温硬化型液状樹脂を、0.05〜0.3kg/m 、好ましくは0.1〜0.2kg/m 塗布して上記湿潤面接着層2を床版1上に形成する。
その湿潤面接着層2が硬化する30分位の養生時間経過後に、該湿潤面接着層2上に、図3に示すように、既述した主剤と硬化剤との2液混合可撓性速硬化型液状樹脂を、0.5〜5.0kg/m 、好ましくは1.5〜3.5kg/m 塗布又はスプレーして上記防水層3を形成する。
【0021】
次に、防水層3が硬化する30分程度の養生時間経過後に、該防水層3上に、図4に示すように、既述した柔軟性樹脂接着剤を、0.1〜0.3kg/m 、好ましくは0.2kg/m 塗布して一次接着層4Aを形成する。
この一次接着層4Aが形成された後、直ちに図5に示すように、既述した粉粒状又はペレット状の熱溶融接着剤6…を、おおよそ0.5〜2.0kg/m 、好ましくは1.0kg/m 散布する。
【0022】
ここで、一次接着層4A上に散布される粉粒状又はペレット状の熱溶融接着剤6…中には、これら熱溶融接着剤6…の融点よりも高い融点を持つ既述したパウダー7…が1:99〜99:1、好ましくは、20:80〜90:10の範囲の重量割合で混入されており、各粉粒状又はペレット状熱溶融接着剤6…の外面全域あるいは外面の一部には、図6に拡大明示するように、高融点パウダー7…が付着あるいは挟み介在されている。このように高融点パウダー7…が混入された粉粒状又はペレット状の熱溶融接着剤6…を使用することによって、これを容器内に貯蔵し保管している時あるいは容器内への保管状態のままで施工現場に輸送する時の雰囲気温度が高い時、特に、外気温の高い夏場であっても、熱溶融接着剤6…の表面の一部が溶けて相互に接合一体化するブロッキング現象の発生を防ぎ、一次接着層4A上にほぼ均一な密度で容易に散布することができる。
【0023】
しかる後、上記熱溶融接着剤6…上に加熱アスファルト舗装体5を舗設することにより、粉粒状又はペレット状の熱溶融接着剤6…が加熱アスファルト舗装体5の熱で溶融流動されて一次接着層4Aとアスファルト舗装体5の間に全面が均一な厚みの二次接着層4Bが形成されることになり、この二次接着層4B及び上記一次接着層4Aからなる舗装接着層4を介してアスファルト舗装体5と防水層3とが相互に接着されて図1に示すような床版の防水舗装構造が施工される。
【0024】
上記のように施工される床版の防水舗装構造においては、湿潤面接着層2の形成、2液混合可撓性速硬化型液状樹脂の塗布による防水層3の形成、粉粒状又はペレット状の熱溶融接着剤6…の散布及び加熱アスファルト舗装体5の舗設といった一連の工程作業を順次行なうことにより、所定の防水舗装を非常に効率よく施工することができる。
【0025】
しかも、施工後は、湿潤面接着層2上に防水層3、一次接着層4A及び二次接着層4Bからなる舗装接着層4という二層の防水構造が存在して優れた防水性能が得られるとともに、施工用車両等の走行によって衝撃荷重や繰り返し応力を受けても防水層3の損傷や破壊を防止し得るだけの強度特性も得られ、これらの相乗により橋梁等の床版の供用耐久性の長期維持を達成することができる。
0026
【発明の効果】
以上要するに、請求項1及び3に係る本発明によれば、防水層または一次接着層上に散布して用いられる粉粒状又はペレット状の熱溶融接着剤にこれら熱溶融接着剤の融点よりも高い融点を持つパウダーを混入させておくことにより、夏場のように外気温が高い条件下でこれら粉粒状又はペレット状の熱溶融接着剤を容器内に貯蔵し保管している時や、容器内への保管状態のままで施工現場に輸送する時に、熱溶融接着剤の表面の一部が溶けて相互に接合一体化するブロッキング現象の発生を防止することができ、これによって、熱溶融接着剤を粉粒状又はペレット状のままに保って防水層または一次接着層上に容易に散布することができるだけでなく、接着剤の塊等を生じることなく防水層または一次接着層の全面にわたりほぼ均等な密度で散布して加熱アスファルト舗装体の熱で溶融流動されて形成される接着層の厚みの均一化及び防水層とアスファルト舗装体との接着性の安定化を図り防水性能の面で高い信頼性を確保でき、衝撃荷重や繰り返し応力に対する防水層の損傷、破壊抑制効果と相俟って橋梁等の床版の供用耐久性の長期に亘り安定維持することができるという効果を奏する。
【図面の簡単な説明】
【図1】 本発明の請求項1に係る床版の防水舗装施工法により完工された請求項5に係る床版の防水舗装構造を示す要部の縦断面図である。
【図2】 本発明の請求項1に係る床版の防水舗装施工法の第一工程を示す要部の拡大縦断面図である。
【図3】 同上防水舗装施工法の第二工程を示す要部の拡大縦断面図である。
【図4】 同上防水舗装施工法の第三工程を示す要部の拡大縦断面図である。
【図5】 同上防水舗装施工法の第四工程を示す要部の拡大縦断面図である。
【図6】 図5の要部の拡大図である。
【符号の説明】
1 床版
2 湿潤面接着層
3 防水層
4A 一次接着層
4B 二次接着層
5 加熱アスファルト舗装体
6 粉粒状又はペレット状の熱溶融接着剤
7 高融点パウダー
[0001]
BACKGROUND OF THE INVENTION
The present invention mainly protects floor slabs from impact loads and repeated stresses associated with traveling of construction vehicles, etc., and corrosion due to rainwater infiltration, such as concrete slabs with reinforcing bars in bridges and steel slabs. The present invention relates to a waterproof pavement construction method for a floor slab and a structure thereof that are required to maintain the service durability for a long period of time.
[0002]
[Prior art]
As a waterproof pavement construction method for floor slabs such as bridges, conventionally, a waterproof waterproof pavement method or floor slab in which a rubber-based waterproof sheet is heat-melted and bonded to the floor slab and an asphalt surface pavement is paved on the waterproof sheet. The mainstream is a waterproof pavement construction method in which a rubber solvent-type paint is applied to form a waterproof paint film and an asphalt surface pavement is paved on the paint film.
[0003]
However, in the conventional general sheet waterproof pavement construction method described above, there are many difficulties such as occurrence of defects such as swelling between the floor slab and the waterproof sheet, or the limited construction area of the day due to poor construction efficiency. In addition, in the waterproof pavement construction method, it is necessary to repeat the application and curing several times, so that the construction efficiency is not only very bad, but the waterproof layer due to the paint film is prone to defects such as swelling. Each construction method has a demand for long-term maintenance of service durability due to lack of resistance to construction load and reliability in terms of waterproofness, as well as resistance to impact loads and repeated stresses associated with the running of construction vehicles, etc. There was a problem that it could not be achieved and had to be fully repaired in a short service cycle.
[0004]
As an alternative to the conventional waterproof pavement construction method of floor slabs having many problems, conventionally, a waterproof layer is formed on the floor slab, and beads, pellets, pillets, chips, etc. are formed on the waterproof layer. After spraying thermoplastic resin particles having various shapes, by applying a heated asphalt pavement on the thermoplastic resin particles, the thermoplastic resin particles are melted by the heat of the heated asphalt pavement, and the waterproof layer and the asphalt There has been proposed a waterproof pavement construction method for floor slabs that forms an adhesive layer that bonds the pavement (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 3-93904
According to the conventional waterproof pavement construction method for floor slabs described above, thermoplastic resin particles that are lightweight and very easy to construct and that can be handled safely at room temperature are sprayed onto the waterproof layer, and heated asphalt is applied on the sprayed layer. Since it is only necessary to apply the pavement, a predetermined waterproof pavement can be efficiently constructed. Also, the adhesive effect between the waterproof layer and the asphalt pavement is improved by the anchor effect that the thermoplastic resin melted by the heat of the asphalt pavement penetrates and fills the gaps of the asphalt pavement and the damaged part of the waterproof layer without gaps. As a result, the occurrence of defects such as blistering can be prevented, and the waterproof layer can be made seamless so that excellent waterproof performance can be secured, and corrosion of the floor slab caused by rainwater penetration can be prevented. In addition, the load applied to the waterproof layer during the passage of construction vehicles such as heavy machinery during construction can be dispersed by the thermoplastic resin particles to prevent damage and breakage of the waterproof layer and maintain the service durability of floor slabs such as bridges for a long period of time. It has the advantage that it can be achieved.
[0007]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional floor slab waterproof pavement construction method, which succeeded in solving the problems of conventional floor slab waterproof pavement methods such as sheet waterproof pavement, a large amount of powder particles used by spraying on the waterproof layer Alternatively, the pellet-like hot melt adhesive was stored and stored in a container, transported to the construction site while being stored in the container, and sprayed at the construction site. Under conditions where the temperature is high, a part of the surface of the hot-melt adhesive melts as the temperature in the container rises, and a blocking phenomenon in which the surfaces are joined and integrated is likely to occur. Such a blocked hot melt adhesive not only makes the spraying operation itself difficult, but also when sprayed onto the waterproof layer, the spraying density becomes uneven, such as the formation of a lump of adhesive locally. The thickness of the adhesive layer formed by melting and flowing with the heat of the asphalt pavement varies, and the adhesion between the waterproof layer and the asphalt pavement is uneven and unstable, providing high reliability in terms of waterproof performance. The problem of not being able to get was left.
[0008]
The present invention has been made in view of the above circumstances, and reliably prevents the occurrence of blocking during storage or transportation of granular or pellet-like hot-melt adhesives, facilitates spraying work, and maintains improvement in construction efficiency. A floor slab waterproof pavement construction method and structure capable of achieving uniform and stable adhesion performance and waterproof performance over the entire pavement surface and achieving long-term maintenance of the floor slab service life are provided. It is an object.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a waterproof pavement construction method for a floor slab according to claim 1 of the present invention includes a step of applying a room temperature curable liquid resin on the floor slab to form an adhesive layer; A step of applying a fast-curing liquid resin to form a waterproof layer, a step of applying a flexible resin adhesive on the waterproof layer to form a primary adhesive layer, and a granular or A step of spraying a pellet-shaped hot melt adhesive, and a heated asphalt pavement is laid on the powdered or pellet-shaped hot melt adhesive, and the heat melt adhesive is melt-flowed by the heat of the heated asphalt pavement. A floor pavement waterproof pavement construction method comprising a step of forming a secondary adhesive layer for adhering both between the primary adhesive layer and the asphalt pavement, the powder being dispersed on the primary adhesive layer These hot and cold adhesives in granular or pellet form It is characterized in the use of those powders having a melting point higher than the melting point of the melt adhesive is mixed.
[0010]
In order to achieve the same object as described above, the waterproof pavement structure of a floor slab according to claim 3 of the present invention includes an adhesive layer formed on a floor slab and made of a room temperature curable liquid resin, and the adhesive layer. A waterproof layer formed by applying a fast-curing liquid resin thereon, a primary adhesive layer formed by applying a flexible resin adhesive on the waterproof layer, and powder or pellets on the primary adhesive layer And a heated asphalt pavement paved on the secondary adhesive layer, and the secondary adhesive layer is heated by the heat of the heated asphalt pavement. A waterproof pavement structure of a floor slab formed by melt-flowing a granular or pellet-like hot-melt adhesive, and as a granular or pellet-like hot-melt adhesive dispersed on the primary adhesive layer Have a melting point higher than that of these hot melt adhesives. Those features and Sururu that you are using what powder is mixed.
[0011]
According to the waterproof pavement structure deck according to the present invention described in waterproof paving construction methods and claim 3 of the deck according to the present invention described in claim 1, both the waterproof layer or primary adhesive layer In order to use a powder or pellet-like hot-melt adhesive used by being dispersed, a powder mixed with powder having a melting point higher than that of the hot-melt adhesive is used. When the molten adhesive is stored and stored in a container, or when transported to the construction site while being stored in the container, a high melting point powder is interposed between each granular or pellet-like hot-melt adhesive. Even when stored in a high-temperature atmosphere or transported in a high-temperature atmosphere such as in the summer when the outside temperature is high, part of the surface of the hot-melt adhesive melts and is joined together. Occurrence of blocking phenomenon It is possible to prevent. Therefore, not only the heat melting adhesive is kept in the form of powder or pellets, but the spraying operation on the waterproof layer or the primary adhesive layer is easy, and the waterproof layer does not cause local adhesive lump etc. Alternatively, it is possible to spray the entire surface of the primary adhesive layer with a substantially uniform density. As a result, the thickness of the adhesive layer formed by melting and flowing with the heat of the heated asphalt pavement is uniform, and the waterproof layer and the asphalt pavement. Adhesion and stability are secured to ensure high reliability in terms of waterproof performance, and in combination with damage to the waterproof layer and damage prevention effects due to impact loads and repeated stresses during construction vehicle travel, bridges, etc. It is possible to stably maintain the service life of the floor slab for a long time.
[0012]
In the above-described waterproof pavement construction method for floor slabs and the structure thereof according to the present invention, the mixing ratio of the high melting point powder is a weight ratio of 1:99 to 99: 1 with respect to the hot melt adhesive in the form of powder or pellets. However, it is preferably a weight ratio of 20:80 to 90:10, and if it is more than that, the melt fluidity due to heat of the heated asphalt pavement is reduced, and if it is less than that, blocking Lack of certainty of prevention.
[0013]
Hereinafter, the materials used in the present invention will be described in detail.
As in the first and third aspects, urethane-based, epoxy-based, MMA-based, and episulfide-based resins are used as the room-temperature curable liquid resin that is applied on the floor slab to form the adhesive layer. Among them, it is preferable to use a urethane resin using NCO%: 5-35% aromatic isocyanate, and the adhesive layer may be a dry surface, but is preferably a wet surface.
[0014]
As the fast-curing liquid resin for forming the waterproof layer, a two-component mixed resin in which any one of urethane resin, urea resin, and urea urethane resin is used and a curing agent is mixed is preferable. Here, the main resin is a polyisocyanate compound such as 4-4-diphenylmethane diisocyanate, polyphenylmethylene polyisocyanate, carbodiimide-modified diphenylmethane diisocyanate, or an isocyanate group that is a reaction product of 4-4-diphenylmethane diisocyanate and a polyol. A terminal prepolymer is preferred, and the curing agent is preferably a modified product obtained by mixing a polyether polyol and an aromatic polyamine.
[0015]
The two-component mixed fast curable liquid resin using the main agent and the curing agent as described above has a tensile elongation of 100% or more, preferably 300% or more, and the curing rate after coating is within 3 hours, preferably 1 It has the feature of being within time.
[0016]
As in the first and third aspects, as the flexible resin adhesive for forming the primary adhesive layer on the waterproof layer, urethane-modified resin or one-component or two-component urethane resin is used.
[0017]
Further, it is sprayed on the waterproof layer or the primary adhesive layer, and melted and flowed by the heat of the heated asphalt pavement when the asphalt pavement is laid, so that an adhesive layer is formed between the waterproof layer or the primary adhesive layer and the asphalt pavement. Examples of the powder-form or pellet-form hot melt adhesive to be formed include polyurethane, polyolefin, polyester, polyamide, ethylene ethyl acrylate (EEA), ethylene vinyl acetate (EVA), and styrene butylene elastomer (SBS). It is desirable to use one or more selected materials having a melting point of 50 ° C. or higher and a tensile elongation of 100% or higher, preferably 300% or higher and excellent in repeated impact properties.
[0018]
In addition, high melting point powder mixed to prevent blocking of powder-form or pellet-type hot melt adhesives includes inorganic fillers such as cinnabar, talc, calcium carbonate, silica, or olefin, paraffin, wax, rosin, terpene, epoxy One kind or a plurality of kinds selected from organic resins such as ethylene ethyl acrylate (EEA) and ethylene vinyl acetate (EVA) are used.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a principal part showing a waterproof pavement structure of a floor slab according to claim 6 completed by the waterproof pavement construction method of a floor slab according to claim 1 of the present invention, and is a reinforced concrete such as a bridge. On the floor slab 1 made of steel or steel, a wet surface adhesive layer 2 having a thickness of 0.05 to 1 mm, preferably 0.1 to 0.5 mm is applied. The liquid-mixing flexible fast-curing liquid resin is applied to form a waterproof layer 3 having a thickness of 0.5 to 5 mm, preferably 1.5 to 3.5 mm. On the waterproof layer 3, a primary adhesive layer 4A formed by a flexible resin adhesive, which will be described later, and a secondary adhesive layer 4B formed by melt flow of a granular or pellet-like hot-melt adhesive, 0 A pavement adhesive layer 4 having a thickness of 5 to 2 mm, preferably 1 to 1.5 mm is formed, and the heated asphalt pavement 5 is paved on the pavement adhesive layer 4 to form the heated asphalt pavement 5 and The waterproof layer 3 is bonded to the pavement adhesive layer 4. The adhesive layer 2 is desirably a wet surface, but may be a dry surface.
[0020]
Next, the construction method of the waterproof pavement structure of the floor slab having the above configuration will be described in detail in the order of steps.
On the floor slab 1, as shown in FIG. 2, the above-described room temperature curable liquid resin is applied in an amount of 0.05 to 0.3 kg / m 2 , preferably 0.1 to 0.2 kg / m 2. A wet surface adhesive layer 2 is formed on the floor slab 1.
After the curing time of about 30 minutes for the wet surface adhesive layer 2 to harden, as shown in FIG. 3, the two-component mixing speed of the main agent and the hardener described above is mixed on the wet surface adhesive layer 2. the curable liquid resin, 0.5~5.0kg / m 2, preferably 1.5~3.5kg / m 2 applied or sprayed to form the waterproof layer 3.
[0021]
Next, after the curing time of about 30 minutes for the waterproof layer 3 to harden, as shown in FIG. The primary adhesive layer 4A is formed by applying m 2 , preferably 0.2 kg / m 2 .
After the primary adhesive layer 4A is formed, as shown in FIG. 5 immediately, the previously described powder or pellet-like hot melt adhesive 6... Is approximately 0.5 to 2.0 kg / m 2 , preferably Apply 1.0 kg / m 2 .
[0022]
Here, the powder 7 described above having a melting point higher than the melting point of the hot-melt adhesive 6 in the granular or pellet-like hot-melt adhesive 6 spread on the primary adhesive layer 4A. 1:99 to 99: 1, preferably mixed in a weight ratio in the range of 20:80 to 90:10, in the entire outer surface of each granular or pellet-like hot melt adhesive 6. As shown in an enlarged view in FIG. 6, high melting point powders 7 are attached or sandwiched. By using the powdered or pelletized hot-melt adhesive 6 in which the high melting point powder 7 is mixed in this way, when this is stored and stored in the container or in the state of storage in the container When the ambient temperature during transportation to the construction site is high, especially in the summer when the outside air temperature is high, part of the surface of the hot-melt adhesive 6. Generation | occurrence | production can be prevented and it can be easily spread | dispersed by the substantially uniform density on 4 A of primary adhesive layers.
[0023]
Thereafter, by laying the heated asphalt pavement 5 on the hot melt adhesive 6..., The powder or pellet-like hot melt adhesive 6. A secondary adhesive layer 4B having a uniform thickness is formed between the layer 4A and the asphalt pavement 5, and the pavement adhesive layer 4 including the secondary adhesive layer 4B and the primary adhesive layer 4A is interposed therebetween. The asphalt pavement 5 and the waterproof layer 3 are bonded to each other so that a floor pave waterproof pavement structure as shown in FIG. 1 is constructed.
[0024]
In the waterproof pavement structure of the floor slab constructed as described above, formation of the wet surface adhesive layer 2, formation of the waterproof layer 3 by application of a two-component mixed flexible fast-curing liquid resin, granular or pellet-like A predetermined waterproof pavement can be applied very efficiently by sequentially performing a series of process operations such as spraying of the hot melt adhesive 6... And pavement of the heated asphalt pavement 5.
[0025]
In addition, after the construction, there is a two-layer waterproof structure of the pavement adhesive layer 4 composed of the waterproof layer 3, the primary adhesive layer 4A and the secondary adhesive layer 4B on the wet surface adhesive layer 2, and excellent waterproof performance is obtained. At the same time, the strength properties are sufficient to prevent damage or destruction of the waterproof layer 3 even when subjected to impact load or repeated stress due to running of the construction vehicle, etc. Long-term maintenance can be achieved.
[ 0026 ]
【The invention's effect】
In short, according to the present invention according to claims 1 and 3, the powder or pellet-like hot-melt adhesive used by spraying on the waterproof layer or the primary adhesive layer is higher than the melting point of these hot-melt adhesives. By mixing powder with melting point, when these hot-melt adhesives in the form of powder or pellets are stored and stored in a container under conditions of high outside air temperature such as in summer, or into the container When transported to the construction site in the storage state, it is possible to prevent the occurrence of a blocking phenomenon in which part of the surface of the hot melt adhesive melts and joins and integrates with each other. Not only can it be kept in the form of powder or pellets, but can be easily sprayed onto the waterproof layer or primary adhesive layer, and the density of the waterproof layer or primary adhesive layer is almost uniform without causing adhesive lump etc. High reliability in terms of waterproof performance is achieved by uniformizing the thickness of the adhesive layer formed by spraying and melting and flowing with the heat of the heated asphalt pavement and stabilizing the adhesion between the waterproof layer and the asphalt pavement. In combination with the damage of the waterproof layer against impact load and repeated stress, and the effect of suppressing the destruction, the service durability of the floor slab such as a bridge can be stably maintained over a long period of time.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part showing a waterproof pavement structure for a floor slab according to claim 5 completed by the waterproof pave construction method for a floor slab according to claim 1 of the present invention.
FIG. 2 is an enlarged longitudinal sectional view of a main part showing a first step of the waterproof pavement construction method for floor slab according to claim 1 of the present invention.
FIG. 3 is an enlarged longitudinal sectional view of a main part showing a second step of the waterproof pavement construction method.
FIG. 4 is an enlarged vertical sectional view of the main part showing the third step of the waterproof pavement construction method.
FIG. 5 is an enlarged vertical sectional view of the main part showing the fourth step of the waterproof pavement construction method.
6 is an enlarged view of a main part of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Floor slab 2 Wet surface adhesive layer 3 Waterproof layer 4A Primary adhesive layer 4B Secondary adhesive layer 5 Heated asphalt pavement 6 Powdered or pellet-like hot melt adhesive 7 High melting point powder

Claims (4)

床版上に常温硬化型液状樹脂を塗布して接着層を形成する工程と、この接着層上に速硬化型液状樹脂を塗布して防水層を形成する工程と、この防水層上に柔軟性樹脂接着剤を塗布して一次接着層を形成する工程と、この一次接着層上に粉粒状又はペレット状の熱溶融接着剤を散布する工程と、この粉粒状又はペレット状の熱溶融接着剤上に加熱アスファルト舗装体を舗設して該加熱アスファルト舗装体の熱で上記熱溶融接着剤を溶融流動させて上記一次接着層とアスファルト舗装体との間に両者を接着する二次接着層を形成する工程とを有する床版の防水舗装施工法であって、
上記一次接着層上に散布される粉粒状又はペレット状の熱溶融接着剤には、これら熱溶融接着剤の融点よりも高い融点を持つパウダーが混入されているものを使用することを特徴とする床版の防水舗装施工法。
Applying a room temperature curable liquid resin on the floor slab to form an adhesive layer, applying a fast curable liquid resin on the adhesive layer to form a waterproof layer, and flexibility on the waterproof layer A step of forming a primary adhesive layer by applying a resin adhesive, a step of spraying a granular or pellet-like hot-melt adhesive on the primary adhesive layer, and an upper portion of the granular- or pellet-like hot-melt adhesive The heated asphalt pavement is paved, and the hot melt adhesive is melted and flowed by the heat of the heated asphalt pavement to form a secondary adhesive layer that bonds both the primary adhesive layer and the asphalt pavement. A waterproof pavement construction method for a floor slab having a process,
The powder-like or pellet-like hot melt adhesive sprayed on the primary adhesive layer is characterized in that a powder having a melting point higher than the melting point of these hot melt adhesives is used. Waterproof pavement construction method for floor slabs.
上記高融点パウダーが、硅砂、炭酸カルシウム、シリカを含む無機質フィラーまたはオリフィン、パラフィン、ワックス、ロジン、テルペン、エポキシを含む有機質樹脂の中から選択された一種又は複数種である請求項1に記載の床版の防水舗装施工法。The refractory powder, silica sand, calcium carbonate, silica inorganic filler or olefin-containing, paraffin, wax, rosin, terpene, according to claim 1 wherein one or more species selected from among organic resin containing epoxy Waterproof pavement construction method for floor slabs. 床版上に形成された常温硬化型液状樹脂からなる接着層と、この接着層上に速硬化型液状樹脂を塗布して形成された防水層と、この防水層上に柔軟性樹脂接着剤を塗布して形成された一次接着層と、この一次接着層上に粉粒状又はペレット状の熱溶融接着剤を散布して形成される二次接着層と、この二次接着層上に舗設された加熱アスファルト舗装体とからなり、上記二次接着層が加熱アスファルト舗装体の熱で粉粒状又はペレット状の熱溶融接着剤を溶融流動されることにより形成されている床版の防水舗装構造であって、
上記一次接着層上に散布される粉粒状又はペレット状熱溶融接着剤として、これら熱溶融接着剤の融点よりも高い融点を持つパウダーが混入されたものを使用していることを特徴とする床版の防水舗装構造。
An adhesive layer made of a room temperature curable liquid resin formed on the floor slab, a waterproof layer formed by applying a fast curable liquid resin on the adhesive layer, and a flexible resin adhesive on the waterproof layer A primary adhesive layer formed by coating, a secondary adhesive layer formed by spraying a granular or pellet-like hot-melt adhesive on the primary adhesive layer, and paved on the secondary adhesive layer It is a waterproof pavement structure for floor slabs, which consists of a heated asphalt pavement, and the secondary adhesive layer is formed by melting and flowing a powdered or pellet-like hot-melt adhesive with the heat of the heated asphalt pavement. And
A floor in which a powder having a melting point higher than the melting point of these hot-melt adhesives is used as the granular or pellet-like hot-melt adhesive sprayed on the primary adhesive layer. Plate waterproof pavement structure.
上記高融点パウダーとして、硅砂、炭酸カルシウム、シリカを含む無機質フィラーまたはオリフィン、パラフィン、ワックス、ロジン、テルペン、エポキシを含む有機質樹脂の中から選択された一種又は複数種を使用している請求項3に記載の床版の防水舗装構造。As the refractory powder, silica sand, calcium carbonate acid, inorganic filler or olefin-containing silica, paraffin, wax, rosin, terpene, claim that use one or more selected from among organic resin containing epoxy The waterproof pavement structure of the floor slab described in 3 .
JP2003023410A 2002-07-11 2003-01-31 Waterproof pavement construction method and structure of floor slab Expired - Fee Related JP4181884B2 (en)

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