JP4435907B2

JP4435907B2 - Pipe inner surface protection method

Info

Publication number: JP4435907B2
Application number: JP24385299A
Authority: JP
Inventors: 伸吉大岡; 満良張
Original assignee: 吉佳株式会社
Priority date: 1999-08-30
Filing date: 1999-08-30
Publication date: 2010-03-24
Anticipated expiration: 2019-08-30
Also published as: JP2001062919A

Description

【０００１】
【発明の属する技術分野】
本発明は、既に敷設された既設管或いは新管等の内周面を被覆層で保護する管内周面保護方法に関する。
【０００２】
【従来の技術】
例えば、地中に埋設された下水管等の既設管は、長期間の使用により内周面が硫化水素やその他の腐食ガス及び付着物や流水等によって侵食され、かつ劣化して、管厚が薄くなって強度が低下したり、更にクラック等が発生している場合がある。
【０００３】
この対策として、既設管の内周面を洗浄すると共に、表面処理機により内周面を研削して侵食部分や劣化部分を除去して滑らかに表面処理を施し、表面処理された内周面にガラス繊維等の補強材と共にポリエステル樹脂やエポキシ樹脂等の硬化性樹脂或いはモルタル等の硬化性材料を吹き付けて、内周面を樹脂或いはモルタルによる被覆層で被覆して更生する管内周面保護方法がある。
【０００４】
また、例えば、特許第２９２５４６６号公報に開示されるように、表面処理機により表面処理された既設管内に光硬化性樹脂、熱硬化性樹脂或いは熱可塑性樹脂等の硬化性材料を含む未硬化状態の可撓ホースを導入し、この導入された可撓ホース内に供給される圧搾空気等の圧縮流体により可撓ホースを拡径して既設管の内周面に可撓ホースを押圧し、この押圧された状態で可撓ホース内に導入された紫外線照射装置によって可撓ホースに紫外線を照射して硬化せしめて既設管内に被覆層を形成する管内周面保護方法がある。
【０００５】
【発明が解決しようとする課題】
上記前者の管内周面保護方法によると、管の内周面が樹脂或いはモルタル等の硬化性材料からなる吹付材の硬化によって形成される被覆層によって被覆保護される。
【０００６】
しかし、管の内周面に吹き付けられた樹脂或いは、モルタル等の被覆層は、その硬化に伴って一般に凝縮する。この凝縮に起因して管の内周面と被覆層との間に隙間が発生して管の内周面と被覆層との密着性が低下すると共に、この密着性の低下に起因して振動や上載荷重等による管の変形が発生すると、硬化後の被覆層が管の内周面から剥離脱落すると共に、管内の流水や環境温度の変化によって加熱及び冷却が繰り返されると、熱膨張係数に差のある管と被覆層との間に応力が発生して密着性が低下し、上記被覆層の剥離脱落が更に誘発されて長期間に亘る安定した被覆層による保護効果を維持することが困難である。
【０００７】
同様に後者の管内周面保護方法にあっても、更生された管と被覆層との熱膨張係数の差に起因して使用によって繰り返される温度変化によって、管と被覆層との間に相対的な応力が繰返し作用して管の内周面と被覆層との密着性の低下が懸念される。
【０００８】
従って、かかる点に鑑みなされた本発明の目的は、長期間に亘る安定した管の保護が得られる管内周面保護方法を提供することにある。
【０００９】
【課題を解決するための手段】
上記目的を達成する請求項１に記載の管内周面保護方法の発明は、管の内周面を硬化性材料を含む被覆材によって被覆し、硬化した上記被覆材によって上記管の内周面を覆う被覆層を形成する管内周面保護方法において、上記管の内径より若干大なる外径を有する弾性変形可能な線材からなる螺旋状の芯材を、上記管の上記内径より小径な外径に縮径しながら上記管へ搬入し、所定の箇所で上記縮径を解除し、それ自体の弾性力によって管の周方向に沿って該内周面に圧接固定させ、管内周面上及び上記圧接固定された芯材上を硬化性材料を含む被覆材によって覆い、硬化した該被覆材によって上記管の内周面を被覆保護する被覆層を形成したことを特徴とする。
【００１０】
請求項１の発明によると、被覆材の硬化に伴って被覆材が収縮しても、被覆材は常に管の内周面に圧接する芯材によって硬化期間全般に亘って、また、硬化後においても恰も管の内周面に押接せしめられた状態に維持されて管の内周面に密着した被覆層が確保される。この密着した被覆層によって管の内周面が被覆保護されると共に、芯材も被覆層によって被覆保護されて腐食及び錆の発生が防止乃至抑制されて安定した状態での使用が可能になる。
【００１１】
また、芯材を弾性変形可能な螺旋状の線材によって形成することから、芯材が管の内周面の形状変化に倣って容易に追従変形する。この結果、管の内周面に径の変化や段差等の形状変化が有る場合にも容易に良好な被覆層を形成することができる。
【００１２】
上記目的を達成する請求項２に記載の管内周面保護方法の発明は、管の内周面に硬化性材料からなる吹付材を吹き付けて硬化せしめ、該硬化した吹付材によって上記管の内周面を覆う被覆層を形成する管内周面保護方法において、上記管の内径より若干大なる外径を有する弾性変形可能な線材からなる螺旋状の芯材を、上記管の上記内径より小径な外径に縮径しながら上記管へ搬入し、所定の箇所で上記縮径を解除し、それ自体の弾性力によって管の周方向に沿って該内周面に圧接固定させ、管内周面上及び上記圧接固定された芯材上に硬化性材料からなる吹付材を吹き付けて被覆し、上記吹付材の硬化によって上記管の内周面を被覆保護する被覆層を形成したことを特徴とする。
【００１３】
請求項２の発明は、請求項１に記載の発明をより具体的に構成したものであって、この発明によると、吹付材を吹き付けることによって容易に管内周面を覆う被覆材が形成される。この吹付材は硬化に伴って収縮するが、吹付材は常に管の内周面に圧接する芯材によって硬化期間全般に亘って、また、硬化後においても恰も管の内周面に押接せしめられた状態に維持されて管の内周面に密着した被覆層が確保され、安定した状態で管の長期間に亘る使用が可能になる。
【００１４】
請求項３に記載された管内周面保護方法の発明は、管内に硬化性材料を含む未硬化状態の可撓ホースを導入し、かつ該可撓ホース内に供給される圧縮流体によって管内周面に可撓ホースを押圧せしめた状態で硬化させることによって上記管の内周面を覆う被覆層を形成する管内周面保護方法において、上記管の内径より若干大なる外径を有する弾性変形可能な線材からなる螺旋状の芯材を、上記管の上記内径より小径な外径に縮径しながら上記管へ搬入し、所定の箇所で上記縮径を解除し、それ自体の弾性力によって管の周方向に沿って該内周面に圧接固定させ、該管内周面に固定された螺旋状の芯材内に硬化性材料を含む未硬化状態の可撓ホースを導入すると共に、該可撓ホース内に圧縮流体を供給して管内周面上及び上記芯材の表面上に可撓ホースを押圧し、該押圧状態下で可撓ホースを硬化させて上記管の内周面を被覆保護する被覆層を形成したことを特徴とする。
【００１５】
請求項３の発明は、請求項１に記載の発明をより具体的に構成したものであって、管内に硬化性材料を含む未硬化状態の可撓ホースを導入し、かつ該可撓ホース内に供給される圧縮流体によって管内周面に可撓ホースを押圧せしめることによって容易に管内周面を覆う被覆材が形成され、管の内周面に圧接する芯材によって可撓ホースが硬化期間全般亘って、また硬化後の被覆層が常に既設管の内周面に押接せしめられた密着状態に維持され、管の内周面が、この密着した被覆層によって被覆保護され、かつ芯材が被覆層によって被覆されて腐食及び錆の発生が防止乃至抑制されることと相俟って長期間に亘る安定した状態での使用が可能になる。
【００１６】
請求項４に記載の発明は、請求項１〜３の管内周面保護方法において、上記芯材は、上記螺旋状の芯材を縮径用治具によって縮径させた状態で上記管内に挿入され、縮径用治具による上記縮径の解除により芯材自体の弾性力によって拡径して管内周面に圧接固定されることを特徴とする。
【００１７】
請求項４の発明によると、芯材を縮径用治具によって縮径させた状態で管内に挿入し、縮径用治具による縮径の解除により芯材自体の弾性力によって芯材を拡径して管内周面に圧接固定され、芯材を容易に管内内周面に沿って配設することができる。
【００１８】
請求項５に記載の発明は、請求項１〜４に記載の管内周面保護方法において、上記管は、既に敷設された既設管であることを特徴とする。
【００１９】
請求項５の発明によると、管が既に敷設された既設管であって、既設管に請求項１〜４の発明を施すことによって、既設管の内周面が、その内周面に密着した被覆層によって被覆保護され、安定した状態で管の長期間に亘る使用が可能になり、特に芯材が既設管の内周面の変化に倣って容易に追従変形することから既設管の内周面に径の変化や段差等が有る場合にも容易に被覆層を形成することができ、確実な管更生が行われる。
【００２０】
請求項６に記載の発明は、請求項１〜４に記載の管内周面保護方法において、上記管は、新管であることを特徴とする。
【００２１】
請求項６の発明は、管が新管であって、作業性に優れた工場等で予め管の内周面に保護層を形成することができると共に、管敷設後においても長期間に亘り安定的に使用することができる。
【００２２】
【発明の実施の形態】
（第１実施の形態）
以下、本発明による管内周面保護方法の第１実施の形態を、下水管等の既設管に施す場合を例に、図１乃至図７によって説明する。
【００２３】
図１において、符号１は地中に埋設された下水管等の既設管であって、既設管１はヒューム管や陶管からなり両端がマンホール２に開口すると共に、その内周面１ａが長期間の使用により硫化水素やその他の腐食ガス或いは、管内を流れる流水等による侵食等によって劣化して強度が低下したり、地圧や地盤沈下、上載荷重等により一部が変形或いはクラック等が発生している場合がある。
【００２４】
このような既設管１の更生、即ち保護方法を、図２に示す概要説明図によって説明する。
【００２５】
先ず、図２（ａ）に要部断面斜視図を示すような保護すべき既設管１の内周面１ａに高圧水を吹き付ける管内洗浄等により内周面１ａを洗浄し、続いて表面処理機により管内洗浄等では落としきれない内周面１ａの汚れ、付着したモルタルや侵入した木根等を取り除くと共に、内周面１ａの劣化部分を研削除去する表面処理を施す。
【００２６】
一方、上記表面処理された既設管１の内周面１ａの内径Ｄより、図２（ｂ）に示すように若干大なる外径ｄを有する螺旋状で弾性変形可能な、例えば硬鋼線材、或いは炭素繊維、アラミド繊維等からなるプラスチック線材等の線材からなる断面略円形の芯材１０を準備する。
【００２７】
この芯材１０を図２（ｃ）に示すように既設管１内に挿入可能なように上記既設管１の内径Ｄより小径な外径ｄ₁ に縮径すると共に、該縮径状態に縮径用治具（図示せず）によって保持し、縮径状態を保持しながら既設管１内の保護を要する更生位置、或いは既設管１の全長に亘って搬入し、搬入した位置で縮径用治具による芯材１０の縮径保持を解除する。
【００２８】
縮径保持が解除された芯材１０は、図２（ｄ）及び同図のＩ−Ｉ線断面図を図３に示すように芯材１０それ自体の弾性力によって拡径して既設管１の周方向に沿って内周面１ａの形状変化に倣って内周面１ａに圧接し、芯材１０それ自体の弾性力によって内周面１ａに圧接した状態で芯材１０が保持固定される。
【００２９】
続いて、既設管１の内周面１ａ上にガラス繊維等の補強材と共にポリエステル樹脂やエポキシ樹脂等の硬化性樹脂、或いはモルタル等の硬化性材料を含む吹付材料１１を吹き付け、この吹付材料１１によって形成される被覆材によって既設管１の内周面１ａ上を被覆する。
【００３０】
このように吹き付けられた吹付材１１は、図２（ｅ）及び同図のＩＩ−ＩＩ線断面図を図４に示すように、既設管１の内周面１ａ上に密着すると共に、内周面１ａと芯材１０の外周面１０ａとによって形成される比較的狭い隙間にも侵入して芯材１０の略全周に亘って密着し、かつ吹付材１１内に芯材１０が埋没されると共に、吹付材１１の表面、即ち内周面１１ａが平滑に形成される。
【００３１】
管１の内周面１ａ及び芯材１０に吹き付けられた吹付材１１は、時経過に伴って次第に硬化して管１の内周面１ａを覆う被覆層２０となる。
【００３２】
この吹付材１１の硬化に伴って、吹付材１１は収縮するものの、吹付材１１は常に既設管１の内周面１ａに圧接保持される芯材１０によって、硬化期間全般に亘って、恰も既設管１の内周面１ａに押接せしめられた状態に維持され、既設管１の内周面１ａに密着した強固な強化プラスチック（ＦＲＰ）或いはモルタルからなる被覆層２０が得られる。
【００３３】
従って、既設管１の内周面１ａは、該内周面１ａ上に密着した被覆層２０によって被覆保護され、かつ芯材１０は被覆層２０によって被覆されて硫化水素や腐食ガス、流水等から保護されて腐食が防止され、特に硬鋼線材を芯材１０として使用する際には、錆の発生をも防止されて安定した状態で長期間に亘る使用が可能になる。
【００３４】
なお、芯材１０と吹付材１１との密着性及び結合強度を確保するために、芯材１０の外周面１０ａに多数の突起を形成するなど粗面形状に形成することが好ましく、また、芯材１０の径及び螺旋状ピッチｐ等は要求強度等に応じて適宜設定し得る。
【００３５】
上記芯材１０は、施行現場において、線材を既設管１の内周面１ａに倣う螺旋状に成形しつつ既設管１内に配設することも可能であり、また複数の螺旋状に形成された芯材１０を既設管１内に連続的に配設することも可能である。
【００３６】
また、芯材１０を、螺旋状の弾性を有する線材によって形成することから、図５に要部断面を示すように、既設管１の内径Ｄが変化する場合でも、その変化に追従して芯材１０が内周面１ａに圧接するように形状変化が可能であり、既設管１の内周面１ａの変化に倣った被覆層２０を容易に形成することができる。
【００３７】
更に、図６に要部断面図を示すように、上載荷重等によって既設管１の継ぎ目等１ｂにずれ乃至段差が生じた場合でも、その既設管１の蛇行等の変移に追従して芯材１０が変形可能であり、既設管１の蛇行等に倣った被覆層２０が形成されて長期間に亘る安定した既設管１の保護がもたらされる。
【００３８】
また、特に吹付材１１として硬化性樹脂を用いる場合には、吹付材１１が硬化せしめられて形成された被覆層２０は、芯材１０の外周面１０ａに付着して結合すると共に、図７に図４の要部拡大図を示すように既設管１の内周面１ａと芯材１０の外周面１０ａとによって形成される楔状の隙間に侵入して硬化した被覆層２０の該部位２０ａが硬化後においても常時芯材１０によって既設管１の内周面１ａ方向に付勢され、被覆層２０が既設管１との相対変形に追従して変形して既設管１の内周面１ａに密着的に押接付勢される。
【００３９】
従って、既設管１と被覆層２０とに相対的な熱膨張係数の差がある場合において、使用による流水や環境温度変化等によって繰返し温度変化が付与されたとしても既設管１の内周面１ａと被覆層２０との密着性が確実に維持され、長期間に亘り安定的な既設管１の保護が確保される。
【００４０】
なお、芯材１０の断面形状は、図８（ａ）に示すように三角形、同図（ｂ）のように矩形、同図（ｃ）に示すように菱形や、同図（ｄ）に示すように楕円形状等要求剛性強度等に応じて適宜変更可能である。
【００４１】
また、上記実施の形態では、吹付材１１を既設管１の内周面１ａ及び芯材１０に吹き付けたが、吹付材１１に代えて硬化性材料を含む被覆材によって、塗布或いは他の適宜手段によって既設管１の内周面１ａ及び芯材１０上を覆い、硬化した被覆材によって被覆層２０を形成することも可能である。
【００４２】
（第２実施の形態）
次に、本発明による管内保護方法の第２実施の形態を、図９に示す工程概要説明図によって説明する。なお、図９において上記図１乃至図７と対応する部分に同一符号を付することで該部の詳細な説明を省略し、異なる部分を主に説明する。
【００４３】
図９の（ａ）は内周面１ａが長期間の使用により劣化して強度が低下し、或い地圧や地盤沈下、上載荷重等により一部が変形或いはクラック等が発生した更生を要する既設管１の要部断面図であり、この既設管１は、内周面１ａが洗浄されると共に、内周面１ａの劣化部分等を研削除去して表面処理が施される。
【００４４】
次に、同図（ｂ）に示すように上記第１実施の形態と同様に、螺旋状で弾性変形可能な線材からなる芯材１０を、既設管１の周方向に沿って芯材１０それ自体の弾性力によって内周面１ａに圧接した状態で固定する。
【００４５】
続いて、同図（ｃ）に示すように、ガラス繊維等の補強材に光硬化性樹脂、熱硬化性樹脂或いは熱可塑性樹脂等の硬化性樹脂等の硬化性材料を含浸せしめて形成された未硬化状態の被覆材となる可撓ホース１５を既設管１の一端から、即ち一方のマンホール２側から圧縮流体、例えば圧搾空気により既設管１内に送り出し、既設管１の一端から他端に向けて反転しつつ既設管１の内周面１ａに沿って押圧して同図（ｃ）に要部を示すように張設する。或いは上記硬化性樹脂をガラス繊維等の補強材に含浸せしめて形成された未硬化状態の可撓ホース１５を既設管１の一端側から他端に向けて引き込み導入し、導入された可撓ホース１５内に圧搾空気を供給して既設管１の内周面１ａに押圧して同様に張設する。
【００４６】
更に、可撓ホース１５内に圧搾空気を供給して可撓ホース１５内の圧力を高めると、同図（ｄ）に示し、かつ要部拡大図を図１０に示すように、可撓ホース１５が既設管１の内周面１ａ及び芯材１０の外周面１０ａに密着し、特に既設管１の内周面１ａと芯材１０の外周面１０ａによって形成される比較的狭い間隙部内にも回り込むように流入して芯材１０の略全周に密着して可撓ホース１５内に芯材１０が埋没され、かつ可撓ホース１５の表面、即ち内周面１５ａが平滑に形成される。
【００４７】
この状態で、可撓ホース１５内に導入された紫外線照射装置を移動させ、この移動させる間に紫外線照射装置からの紫外線照射により可撓ホース１５を硬化させて、内周面１ａに密着した強固な強化プラスチック（ＦＲＰ）からなる被覆層２０を形成する。
【００４８】
従って、既設管１の内周面１ａは、該内周面１ａ上に密着した被覆層２０によって被覆保護され、かつ芯材１０は被覆層２０によって被覆されて腐食及び錆の発生が防止される。
【００４９】
また、硬化せしめられて形成された被覆層２０が芯材１０の外周面１０ａに付着して芯材１０と結合すると共に、図１０に要部拡大図を示すように既設管１の内周面１ａと芯材１０の外周面１０ａとによって形成される楔状の隙間において硬化した被覆層１０の部位２０ａが、硬化後においても常時芯材１０によって既設管１の内周面１ａ方向に押圧付勢され、その若干の変形によって被覆層２０が既設管１の内周面１ａに押接付勢される。その結果、既設管１と被覆層２０とに相対的な熱膨張係数の差がある場合において、使用のよる流水や環境温度変化等によって繰返し温度変化が付与されたとしても既設管１の内周面１ａと被覆層２０との密着性が安定的に維持され、長期間に亘る既設管１の保護が確保される。
【００５０】
なお、芯材１０と被覆層２０の密着性及び結合強度を確保するために、芯材１０の外周面１０ａに多数の突起を形成するなど粗面形状に形成することが好ましく、また、芯材１０の径及び螺旋状ピッチ、芯材１０の断面形状等は、第１実施の形態と同様に、要求強度等に応じて適宜変更可能である。
【００５１】
本発明は上記実施の形態に限定されることなく、発明の趣旨を逸脱しない範囲で種々変更可能である。例えば、上記各実施の形態では、下水管等の既設管１の保護を例に説明したが、マンホール２をはじめ、断面略円形のトンネルやその他の管状構造物の内周面保護に本発明を適宜適用することも可能であり、また、図１０に示すように、予め新管５の内周面５ａに沿って螺旋状の芯材１０を配設して、上記各実施の形態と同様に被覆層２０を形成することも可能であり、この場合、特に作業性に優れた工場等で管の内周面に保護層を形成することができと共に、管敷設後において長期間に亘り安定的に使用することができる。
【００５２】
【発明の効果】
以上説明した本発明によると、管内周面を覆う硬化性材料を含む被覆材は、その硬化に伴って収縮するが、硬化期間全般に亘って常に管の内周面に圧接する芯材によって既設管の内周面に押接せしめられた密着した状態に保持され、管内周面は被覆材が硬化して形成された被覆層によって被覆保護され、かつ芯材も被覆層によって被覆されて腐食及び錆の発生が防止される。
【００５３】
更に、硬化後においても被覆層が既設管の内周面に押接せしめられた状態に維持され、管の内周面は密着した被覆層によって被覆保護され、かつ芯材が被覆層によって被覆されて腐食及び錆の発生が防止乃至抑制されることと相俟って安定した状態で管の長期間に亘る使用が可能になる。
【００５４】
また、芯材を弾性変形可能な螺旋状の線材によって形成することから、管の内周面の形状変化に倣って容易に追従変形することから管の内周面に径の変化や段差等が有る場合にも容易に良好な被覆層を形成することができる。
【００５５】
特に、既に敷設された既設管に本発明を適用すると、芯材が既設管の内周面の変化に倣って容易に追従変形することから、長期間の使用により既設管の内周面に径の変化や段差等が有る場合でも容易に被覆層を形成することができ、確実な管更生が行われる。
【００５６】
また、新管に本発明を適用すると、作業性に優れた工場等で管の内周面に保護層を形成することができると共に、管敷設後において長期間に亘り安定的に使用することができる。
【図面の簡単な説明】
【図１】本発明による管内周面保護方法を下水管等の既設管に適用した場合を例に説明する第１実施の形態の概要説明図である。
【図２】同じく、保護方法の工程を説明する概要説明図である。
【図３】図２のＩ−Ｉ線断面図である。
【図４】図２のＩＩ−ＩＩ線断面図である。
【図５】内径が変化する既設管に本実施の形態の保護方法を施した場合の概要説明図である。
【図６】継ぎ目等に段差を有する既設管に本実施の形態の保護方法を施した場合の概要説明図である。
【図７】図４の要部拡大図である。
【図８】芯材の種々の断面形状を説明する断面図である。
【図９】本発明による管内周面保護方法を下水管等の既設管に適用した場合を例に説明する第２実施の形態の概要説明図である。
【図１０】図９の要部拡大図である
【図１１】本発明による管内面保護方法の実施の形態を新管に適用した場合を説明する概要説明図である。
【符号の説明】
１既設管
１ａ内周面
２マンホール
５新管
５ａ内周面
１０芯材
１０ａ外周面
１１吹付材
１１ａ内面
１５可撓性ホース
２０被覆層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe inner peripheral surface protecting method for protecting an inner peripheral surface of an existing pipe or a new pipe already laid with a coating layer.
[0002]
[Prior art]
For example, existing pipes such as sewage pipes buried in the ground are eroded by hydrogen sulfide, other corrosive gases, deposits and running water, etc. due to long-term use, and the pipe thickness is deteriorated. In some cases, the film becomes thinner and the strength is reduced, and cracks and the like are generated.
[0003]
As a countermeasure, the inner peripheral surface of the existing pipe is cleaned, and the inner peripheral surface is ground by a surface treatment machine to remove the eroded part and the deteriorated part and perform a smooth surface treatment on the surface-treated inner peripheral surface. There is a method for protecting the inner peripheral surface of a pipe by spraying a curable resin such as polyester resin or epoxy resin or a curable material such as mortar together with a reinforcing material such as glass fiber, and coating the inner peripheral surface with a coating layer of resin or mortar to regenerate is there.
[0004]
For example, as disclosed in Japanese Patent No. 2925466, an uncured state containing a curable material such as a photocurable resin, a thermosetting resin, or a thermoplastic resin in an existing pipe that has been surface-treated by a surface treatment machine The flexible hose is expanded by a compressed fluid such as compressed air supplied into the introduced flexible hose, and the flexible hose is pressed against the inner peripheral surface of the existing pipe. There is a method for protecting the inner peripheral surface of a pipe in which a coating layer is formed in an existing pipe by irradiating and curing the flexible hose with ultraviolet rays by an ultraviolet irradiation apparatus introduced into the flexible hose in a pressed state.
[0005]
[Problems to be solved by the invention]
According to the former method for protecting the inner peripheral surface of the tube, the inner peripheral surface of the tube is covered and protected by the coating layer formed by curing the spray material made of a curable material such as resin or mortar.
[0006]
However, the resin or mortar coating layer sprayed on the inner peripheral surface of the tube generally condenses as it hardens. Due to this condensation, a gap is generated between the inner peripheral surface of the tube and the coating layer, and the adhesion between the inner peripheral surface of the tube and the coating layer is reduced. If the tube is deformed due to an overload or the like, the cured coating layer peels off from the inner peripheral surface of the tube, and if heating and cooling are repeated due to changes in the flowing water and environmental temperature in the tube, the coefficient of thermal expansion Stress is generated between the pipe and the coating layer with a difference, resulting in a decrease in adhesion, and it is difficult to maintain the protective effect of the stable coating layer over a long period of time due to further triggering of peeling off of the coating layer. It is.
[0007]
Similarly, even in the latter method for protecting the inner peripheral surface of the tube, the relative change between the tube and the coating layer is caused by the temperature change repeated by use due to the difference in the thermal expansion coefficient between the regenerated tube and the coating layer. There is a concern about the deterioration of the adhesion between the inner peripheral surface of the pipe and the coating layer due to repeated stress.
[0008]
Therefore, the objective of this invention made | formed in view of this point is to provide the pipe inner peripheral surface protection method which can obtain the protection of the pipe | tube stable over a long period of time.
[0009]
[Means for Solving the Problems]
The invention of the pipe inner peripheral surface protecting method according to claim 1, which achieves the above object, comprises coating the inner peripheral surface of the pipe with a coating material containing a curable material, and covering the inner peripheral surface of the pipe with the cured coating material. In the pipe inner peripheral surface protecting method for forming a covering layer to cover, a helical core made of an elastically deformable wire having an outer diameter slightly larger than the inner diameter of the pipe is changed to an outer diameter smaller than the inner diameter of the pipe. It is carried into the pipe while being reduced in diameter, released from the reduced diameter at a predetermined location, and pressed and fixed to the inner peripheral surface along the circumferential direction of the pipe by its own elastic force. The fixed core material is covered with a coating material containing a curable material, and a coating layer that covers and protects the inner peripheral surface of the tube is formed by the cured coating material.
[0010]
According to the invention of claim 1, even if the coating material shrinks as the coating material is cured, the coating material always covers the entire curing period by the core material pressed against the inner peripheral surface of the pipe, and after the curing. In addition, the covering layer is maintained in a state where it is pressed against the inner peripheral surface of the pipe and is in close contact with the inner peripheral surface of the pipe. The inner peripheral surface of the tube is covered and protected by this tightly covering layer, and the core material is also covered and protected by the covering layer, so that the occurrence of corrosion and rust is prevented or suppressed, and the use in a stable state becomes possible.
[0011]
Further, since the core material is formed of a spiral wire that can be elastically deformed, the core material easily follows and deforms following the shape change of the inner peripheral surface of the tube. As a result, it is possible to easily form a good coating layer even when the inner peripheral surface of the tube has a change in diameter or a change in shape such as a step.
[0012]
The invention of the pipe inner peripheral surface protecting method according to claim 2, which achieves the above object, comprises spraying and curing a spray material made of a curable material on the inner peripheral surface of the pipe, and the inner periphery of the pipe by the cured spray material. In the pipe inner peripheral surface protecting method for forming a coating layer covering the surface, a spiral core material made of an elastically deformable wire having an outer diameter slightly larger than the inner diameter of the pipe is arranged on an outer diameter smaller than the inner diameter of the pipe. It is carried into the pipe while being reduced in diameter, released from the reduced diameter at a predetermined location, and pressed and fixed to the inner peripheral surface along the circumferential direction of the pipe by its own elastic force, on the inner peripheral surface of the pipe and The core material fixed by pressure contact is sprayed and coated with a spray material made of a curable material, and a coating layer that covers and protects the inner peripheral surface of the tube is formed by curing the spray material.
[0013]
The invention of claim 2 is a more specific configuration of the invention of claim 1, and according to the invention, a covering material that easily covers the inner peripheral surface of the pipe is formed by spraying the spraying material. . Although this spray material shrinks as it hardens, the spray material always presses against the inner peripheral surface of the pipe over the entire curing period by the core material that is pressed against the inner peripheral surface of the pipe. Thus, a coating layer that is maintained in a closed state and is in close contact with the inner peripheral surface of the pipe is secured, and the pipe can be used over a long period of time in a stable state.
[0014]
According to a third aspect of the present invention, there is provided a pipe inner peripheral surface protecting method, wherein an uncured flexible hose containing a curable material is introduced into the pipe, and the pipe inner peripheral surface is supplied by a compressed fluid supplied into the flexible hose. In a tube inner peripheral surface protection method for forming a coating layer covering the inner peripheral surface of the tube by curing the flexible hose in a state where the flexible hose is pressed, the tube can be elastically deformed having an outer diameter slightly larger than the inner diameter of the tube. A helical core made of a wire rod is carried into the tube while being reduced in diameter to an outer diameter smaller than the inner diameter of the tube, the reduced diameter is released at a predetermined location, and the elastic force of the tube itself is released . An uncured flexible hose containing a curable material is introduced into a spiral core material fixed to the inner peripheral surface along the circumferential direction and fixed to the inner peripheral surface of the pipe, and the flexible hose Compressed fluid is supplied into the pipe inner peripheral surface and the surface of the core material. Pressing the hose flexures, to cure the flexible hose under pressing pressure conditions, characterized in that the formation of the coating layer covering the inner peripheral surface of the tube.
[0015]
The invention of claim 3 is a more specific configuration of the invention of claim 1, wherein an uncured flexible hose containing a curable material is introduced into the tube, and the flexible hose A covering material that easily covers the inner peripheral surface of the tube is formed by pressing the flexible hose against the inner peripheral surface of the tube by the compressed fluid supplied to the tube, and the flexible hose is generally cured by the core material that is pressed against the inner peripheral surface of the tube. In addition, the cured coating layer is always maintained in a close contact state pressed against the inner peripheral surface of the existing pipe, the inner peripheral surface of the pipe is covered and protected by the tight coating layer, and the core material is Combined with the coating layer preventing or suppressing the occurrence of corrosion and rust, it can be used in a stable state for a long period of time.
[0016]
According to a fourth aspect of the present invention, in the pipe inner peripheral surface protecting method according to the first to third aspects, the core material is inserted into the pipe in a state in which the diameter of the spiral core material is reduced by a diameter reduction jig. In addition, the diameter reduction is performed by the elastic force of the core material itself by releasing the diameter reduction by the diameter reduction jig, and the pressure is fixed to the inner peripheral surface of the pipe.
[0017]
According to the fourth aspect of the present invention, the core material is inserted into the pipe after being reduced in diameter by the diameter reducing jig, and the core material is expanded by the elastic force of the core material itself by releasing the diameter reduction by the diameter reducing jig. The core material can be easily disposed along the inner peripheral surface of the pipe.
[0018]
According to a fifth aspect of the present invention, in the pipe inner peripheral surface protecting method according to the first to fourth aspects, the pipe is an existing pipe already laid.
[0019]
According to the invention of claim 5, the pipe is an existing pipe already laid, and by applying the invention of claims 1 to 4 to the existing pipe, the inner peripheral surface of the existing pipe is in close contact with the inner peripheral surface thereof The coating is protected by the coating layer, and the tube can be used for a long period of time in a stable state. Especially, the core material easily follows and deforms following the change of the inner peripheral surface of the existing pipe, so the inner circumference of the existing pipe Even when the surface has a change in diameter, a step, or the like, the coating layer can be easily formed, and reliable pipe renewal is performed.
[0020]
A sixth aspect of the present invention is the pipe inner peripheral surface protecting method according to the first to fourth aspects, wherein the pipe is a new pipe.
[0021]
In the invention of claim 6, the pipe is a new pipe, and a protective layer can be formed on the inner peripheral surface of the pipe in advance in a factory having excellent workability, and is stable for a long time even after the pipe is laid. Can be used.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, the case where the first embodiment of the pipe inner peripheral surface protecting method according to the present invention is applied to an existing pipe such as a sewer pipe will be described with reference to FIGS.
[0023]
In FIG. 1, reference numeral 1 denotes an existing pipe such as a sewer pipe buried in the ground. The existing pipe 1 is made of a fume pipe or a ceramic pipe, and both ends open to a manhole 2 and its inner peripheral surface 1a is long. Deterioration due to erosion caused by hydrogen sulfide, other corrosive gases or flowing water flowing through the pipe, etc., due to use over a period of time, resulting in a decrease in strength, or partial deformation or cracking etc. due to ground pressure, land subsidence, overload, etc. May have.
[0024]
Such rehabilitation of the existing pipe 1, that is, a protection method will be described with reference to a schematic explanatory diagram shown in FIG.
[0025]
First, the inner peripheral surface 1a is cleaned by in-pipe cleaning or the like in which high-pressure water is blown to the inner peripheral surface 1a of the existing pipe 1 to be protected as shown in FIG. Thus, the inner peripheral surface 1a, which cannot be removed by cleaning inside the pipe, is removed from the dirt, adhering mortar, invading tree roots, and the like, and surface treatment is performed to remove the deteriorated portion of the inner peripheral surface 1a by grinding.
[0026]
On the other hand, from the inner diameter D of the inner peripheral surface 1a of the existing pipe 1 subjected to the surface treatment, a spiral and elastically deformable outer diameter d as shown in FIG. Alternatively, a core material 10 having a substantially circular cross section made of a wire such as a plastic wire made of carbon fiber, aramid fiber or the like is prepared.
[0027]
As shown in FIG. 2C, the core member 10 is reduced in diameter to an outer diameter d ₁ smaller than the inner diameter D of the existing tube 1 so that the core member 10 can be inserted into the existing tube 1. It is held by a diameter jig (not shown), and while maintaining the reduced diameter state, the rehabilitation position that requires protection in the existing pipe 1 or the entire length of the existing pipe 1 is carried in, and the diameter is reduced at the loaded position. The reduced diameter holding of the core material 10 by the jig is released.
[0028]
The core material 10 whose diameter reduction has been released is expanded by the elastic force of the core material 10 itself as shown in FIG. The core material 10 is held and fixed in a state where it is pressed against the inner peripheral surface 1a following the shape change of the inner peripheral surface 1a along the circumferential direction and is pressed against the inner peripheral surface 1a by the elastic force of the core material 10 itself. .
[0029]
Subsequently, a spraying material 11 containing a curable resin such as a polyester resin or an epoxy resin, or a curable material such as mortar together with a reinforcing material such as glass fiber is sprayed on the inner peripheral surface 1 a of the existing pipe 1. The inner peripheral surface 1a of the existing pipe 1 is covered with the covering material formed by the above.
[0030]
The spray material 11 sprayed in this way is in close contact with the inner peripheral surface 1a of the existing pipe 1 as shown in FIG. It penetrates into a relatively narrow gap formed by the surface 1 a and the outer peripheral surface 10 a of the core material 10, adheres to substantially the entire circumference of the core material 10, and the core material 10 is buried in the spray material 11. At the same time, the surface of the spray material 11, that is, the inner peripheral surface 11a is formed smoothly.
[0031]
The spray material 11 sprayed onto the inner peripheral surface 1a of the tube 1 and the core material 10 gradually hardens with time and becomes a coating layer 20 that covers the inner peripheral surface 1a of the tube 1.
[0032]
Although the spraying material 11 contracts as the spraying material 11 is cured, the spraying material 11 is always provided by the core material 10 held in pressure contact with the inner peripheral surface 1a of the existing pipe 1 over the entire curing period. A coating layer 20 made of strong reinforced plastic (FRP) or mortar that is kept pressed against the inner peripheral surface 1a of the tube 1 and is in close contact with the inner peripheral surface 1a of the existing tube 1 is obtained.
[0033]
Accordingly, the inner peripheral surface 1a of the existing pipe 1 is covered and protected by the coating layer 20 that is in close contact with the inner peripheral surface 1a, and the core material 10 is covered by the coating layer 20 so as to be protected from hydrogen sulfide, corrosive gas, running water, and the like. It is protected and corrosion is prevented. In particular, when a hard steel wire is used as the core material 10, the generation of rust is also prevented, and it can be used for a long time in a stable state.
[0034]
In order to secure the adhesion and bonding strength between the core material 10 and the spray material 11, it is preferable to form a rough surface such as a large number of protrusions on the outer peripheral surface 10a of the core material 10. The diameter of the material 10 and the helical pitch p can be appropriately set according to the required strength and the like.
[0035]
The core material 10 can be disposed in the existing pipe 1 while forming the wire in a spiral shape following the inner peripheral surface 1a of the existing pipe 1 at the site of execution, and is formed in a plurality of spiral shapes. It is also possible to continuously arrange the core material 10 in the existing pipe 1.
[0036]
In addition, since the core material 10 is formed of a spiral elastic wire, even if the inner diameter D of the existing pipe 1 changes as shown in the cross section of the main part in FIG. 5, the core follows the change. The shape can be changed so that the material 10 is in pressure contact with the inner peripheral surface 1a, and the coating layer 20 can be easily formed following the change in the inner peripheral surface 1a of the existing pipe 1.
[0037]
Further, as shown in the cross-sectional view of the main part in FIG. 6, even when a deviation or a step is generated in the joint 1b or the like of the existing pipe 1 due to an overload or the like, the core material follows the transition of the existing pipe 1 such as meandering. 10 is deformable, and a coating layer 20 that follows the meandering of the existing pipe 1 is formed to provide stable protection of the existing pipe 1 over a long period of time.
[0038]
In particular, when a curable resin is used as the spray material 11, the coating layer 20 formed by curing the spray material 11 adheres to and binds to the outer peripheral surface 10 a of the core material 10, as shown in FIG. 7. As shown in the enlarged view of the main part of FIG. 4, the portion 20 a of the coating layer 20 that has hardened by entering a wedge-shaped gap formed by the inner peripheral surface 1 a of the existing pipe 1 and the outer peripheral surface 10 a of the core member 10 is cured. After that, the core material 10 is always urged toward the inner peripheral surface 1a of the existing pipe 1 and the coating layer 20 is deformed following the relative deformation with the existing pipe 1 and is in close contact with the inner peripheral surface 1a of the existing pipe 1. It is pushed and biased.
[0039]
Therefore, in the case where there is a difference in relative thermal expansion coefficient between the existing pipe 1 and the coating layer 20, the inner peripheral surface 1 a of the existing pipe 1 even if a temperature change is repeatedly applied due to running water or an environmental temperature change due to use. And the covering layer 20 are reliably maintained, and stable protection of the existing pipe 1 is ensured over a long period of time.
[0040]
The cross-sectional shape of the core material 10 is shown in FIG. 8A as a triangle, as shown in FIG. 8B as a rectangle, as shown in FIG. 8C as a rhombus, and as shown in FIG. Thus, it can be appropriately changed according to the required rigidity and the like such as an elliptical shape.
[0041]
Moreover, in the said embodiment, although the spraying material 11 was sprayed on the internal peripheral surface 1a of the existing pipe 1, and the core material 10, it replaces with the spraying material 11 and is applied or other suitable means by the coating | covering material containing a curable material. It is also possible to cover the inner peripheral surface 1a of the existing pipe 1 and the core material 10 and form the coating layer 20 with a cured coating material.
[0042]
(Second Embodiment)
Next, a second embodiment of the in-pipe protection method according to the present invention will be described with reference to a process outline explanatory diagram shown in FIG. In FIG. 9, parts corresponding to those in FIGS. 1 to 7 are denoted by the same reference numerals, detailed description thereof will be omitted, and different parts will be mainly described.
[0043]
FIG. 9 (a) requires rehabilitation in which the inner peripheral surface 1a deteriorates due to long-term use and the strength decreases, or a part of the inner peripheral surface 1a is deformed or cracked due to ground pressure, ground subsidence, or an overload. It is principal part sectional drawing of the existing pipe 1, This internal pipe 1 is surface-treated by grinding and removing the degradation part etc. of the internal peripheral surface 1a while wash | cleaning the internal peripheral surface 1a.
[0044]
Next, as shown in FIG. 4B, the core material 10 made of a spiral and elastically deformable wire is connected to the core material 10 along the circumferential direction of the existing pipe 1 as in the first embodiment. It fixes in the state which press-contacted to the internal peripheral surface 1a with the elastic force of itself.
[0045]
Subsequently, as shown in FIG. 3C, the reinforcing material such as glass fiber was formed by impregnating a curable material such as a curable resin such as a photocurable resin, a thermosetting resin, or a thermoplastic resin. A flexible hose 15 serving as an uncured coating material is sent from one end of the existing pipe 1, that is, from one manhole 2 side into the existing pipe 1 by a compressed fluid, for example, compressed air, and from one end of the existing pipe 1 to the other end. While being reversed, it is pressed along the inner peripheral surface 1a of the existing pipe 1 and stretched as shown in FIG. Alternatively, an uncured flexible hose 15 formed by impregnating a reinforcing material such as glass fiber with the curable resin is drawn in from one end side of the existing pipe 1 to the other end, and the introduced flexible hose is introduced. The compressed air is supplied into 15 and pressed against the inner peripheral surface 1a of the existing pipe 1 to be similarly stretched.
[0046]
Furthermore, when compressed air is supplied into the flexible hose 15 to increase the pressure in the flexible hose 15, the flexible hose 15 is shown in FIG. Is in close contact with the inner peripheral surface 1a of the existing pipe 1 and the outer peripheral surface 10a of the core material 10, and in particular, also wraps around a relatively narrow gap formed by the inner peripheral surface 1a of the existing pipe 1 and the outer peripheral surface 10a of the core material 10. In this way, the core material 10 is buried in the flexible hose 15 in close contact with the entire circumference of the core material 10, and the surface of the flexible hose 15, that is, the inner peripheral surface 15a is formed smoothly.
[0047]
In this state, the ultraviolet irradiation device introduced into the flexible hose 15 is moved, and during this movement, the flexible hose 15 is cured by ultraviolet irradiation from the ultraviolet irradiation device, and is firmly attached to the inner peripheral surface 1a. A coating layer 20 made of a reinforced plastic (FRP) is formed.
[0048]
Therefore, the inner peripheral surface 1a of the existing pipe 1 is covered and protected by the coating layer 20 in close contact with the inner peripheral surface 1a, and the core material 10 is covered by the coating layer 20 to prevent the occurrence of corrosion and rust. .
[0049]
Further, the coating layer 20 formed by being cured adheres to the outer peripheral surface 10a of the core member 10 and is bonded to the core member 10, and the inner peripheral surface of the existing pipe 1 is shown in FIG. The portion 20a of the coating layer 10 cured in the wedge-shaped gap formed by 1a and the outer peripheral surface 10a of the core material 10 is always pressed and biased in the direction of the inner peripheral surface 1a of the existing pipe 1 by the core material 10 even after curing. The covering layer 20 is pressed and urged against the inner peripheral surface 1a of the existing pipe 1 by the slight deformation. As a result, in the case where there is a relative thermal expansion coefficient difference between the existing pipe 1 and the coating layer 20, the inner circumference of the existing pipe 1 even if a temperature change is repeatedly applied due to running water or an environmental temperature change. The adhesion between the surface 1a and the coating layer 20 is stably maintained, and the protection of the existing pipe 1 over a long period is ensured.
[0050]
In addition, in order to ensure the adhesiveness and bond strength of the core material 10 and the coating layer 20, it is preferable to form in rough surface shape, such as forming many protrusions in the outer peripheral surface 10a of the core material 10, and the core material. The diameter of 10 and the helical pitch, the cross-sectional shape of the core material 10 and the like can be appropriately changed according to the required strength and the like, as in the first embodiment.
[0051]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in each of the above embodiments, the protection of the existing pipe 1 such as a sewage pipe has been described as an example. However, the present invention is applied to the protection of the inner peripheral surface of a manhole 2, a tunnel having a substantially circular cross section, and other tubular structures. As shown in FIG. 10, a spiral core material 10 is disposed in advance along the inner peripheral surface 5a of the new tube 5 as shown in FIG. The covering layer 20 can also be formed. In this case, a protective layer can be formed on the inner peripheral surface of the pipe in a factory having excellent workability and stable for a long time after the pipe is laid. Can be used for
[0052]
【The invention's effect】
According to the present invention described above, the covering material containing the curable material covering the inner peripheral surface of the pipe shrinks with the hardening, but is already provided by the core material that is always in pressure contact with the inner peripheral surface of the pipe over the entire curing period. The inner peripheral surface of the tube is held in close contact with the inner peripheral surface of the tube, and the inner peripheral surface of the tube is covered and protected by a coating layer formed by curing the coating material, and the core material is also coated with the coating layer to be corroded and corroded. Rust generation is prevented.
[0053]
Furthermore, even after curing, the coating layer is kept pressed against the inner peripheral surface of the existing pipe, the inner peripheral surface of the pipe is covered and protected by the tight coating layer, and the core material is covered by the coating layer. This makes it possible to use the pipe for a long period of time in a stable state coupled with the prevention or suppression of the occurrence of corrosion and rust.
[0054]
In addition, since the core material is formed of an elastically deformable spiral wire, it easily deforms following the shape change of the inner peripheral surface of the tube, so there is a change in diameter or a step on the inner peripheral surface of the tube. Even if it exists, a good coating layer can be easily formed.
[0055]
In particular, when the present invention is applied to an existing pipe that has already been laid, the core material easily deforms following the change in the inner peripheral surface of the existing pipe. Even when there is a change or a step, the coating layer can be easily formed, and reliable pipe renewal is performed.
[0056]
In addition, when the present invention is applied to a new pipe, it is possible to form a protective layer on the inner peripheral surface of the pipe in a factory with excellent workability and to be used stably over a long period of time after laying the pipe. it can.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic explanatory diagram of a first embodiment illustrating an example in which a pipe inner peripheral surface protecting method according to the present invention is applied to an existing pipe such as a sewer pipe.
FIG. 2 is a schematic explanatory view explaining the steps of the protection method, similarly.
3 is a cross-sectional view taken along the line II of FIG.
4 is a cross-sectional view taken along line II-II in FIG.
FIG. 5 is a schematic explanatory diagram when the protection method according to the present embodiment is applied to an existing pipe whose inner diameter changes.
FIG. 6 is a schematic explanatory diagram in the case where the protection method of the present embodiment is applied to an existing pipe having a step at a joint or the like.
FIG. 7 is an enlarged view of a main part of FIG.
FIG. 8 is a cross-sectional view illustrating various cross-sectional shapes of a core material.
FIG. 9 is a schematic explanatory diagram of a second embodiment illustrating an example in which the pipe inner peripheral surface protecting method according to the present invention is applied to an existing pipe such as a sewer pipe.
FIG. 10 is an enlarged view of a main part of FIG. 9. FIG. 11 is a schematic explanatory diagram for explaining a case where the embodiment of the pipe inner surface protecting method according to the present invention is applied to a new pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Existing pipe 1a Inner peripheral surface 2 Manhole 5 New pipe 5a Inner peripheral surface 10 Core material 10a Outer peripheral surface 11 Spraying material 11a Inner surface 15 Flexible hose 20 Coating layer

Claims

In the tube inner peripheral surface protection method of covering the inner peripheral surface of the tube with a coating material containing a curable material, and forming a coating layer covering the inner peripheral surface of the tube with the cured coating material,
A spiral core made of an elastically deformable wire having an outer diameter larger than the inner diameter of the pipe is carried into the pipe while being reduced in diameter to an outer diameter smaller than the inner diameter of the pipe. The covering material containing a curable material on the inner peripheral surface of the tube and the core material fixed by pressure contact is fixed to the inner peripheral surface along the circumferential direction of the tube by releasing its diameter reduction and elastic force of itself. A method for protecting the inner peripheral surface of a pipe, comprising forming a coating layer that covers and protects the inner peripheral surface of the pipe with the cured covering material.

In the pipe inner peripheral surface protection method of spraying and curing a spray material made of a curable material on the inner peripheral surface of the pipe, and forming a coating layer covering the inner peripheral surface of the pipe with the cured spray material,
A spiral core made of an elastically deformable wire having an outer diameter larger than the inner diameter of the pipe is carried into the pipe while being reduced in diameter to an outer diameter smaller than the inner diameter of the pipe. The above-mentioned reduced diameter is released, and is pressed and fixed to the inner peripheral surface along the circumferential direction of the tube by its own elastic force, and the spraying material made of a curable material on the inner peripheral surface of the tube and the core member fixed by pressure contact A method for protecting the inner peripheral surface of a pipe, wherein a coating layer for covering and protecting the inner peripheral surface of the pipe is formed by curing the spray material.

Introducing an uncured flexible hose containing a curable material in the tube, and curing the tube in a state where the flexible hose is pressed against the inner peripheral surface of the tube by the compressed fluid supplied into the flexible hose. In the pipe inner peripheral surface protection method for forming a coating layer covering the inner peripheral surface of
A spiral core made of an elastically deformable wire having an outer diameter larger than the inner diameter of the pipe is carried into the pipe while being reduced in diameter to an outer diameter smaller than the inner diameter of the pipe. The reduced diameter is released, and is pressed against and fixed to the inner peripheral surface along the circumferential direction of the tube by its own elastic force, and the spiral core material fixed to the inner peripheral surface of the tube contains a curable material. In addition to introducing a flexible hose in a cured state, a compressed fluid is supplied into the flexible hose to press the flexible hose on the inner peripheral surface of the pipe and the surface of the core material, and the flexible hose under the pressed state A pipe inner peripheral surface protecting method characterized by forming a coating layer for curing and protecting the inner peripheral surface of the pipe.

The core material is inserted into the tube in a state where the spiral core material is reduced in diameter by a diameter reduction jig, and is expanded by the elastic force of the core material itself by releasing the diameter reduction by the diameter reduction jig. The pipe inner peripheral surface protecting method according to claim 1, wherein the pipe inner peripheral surface is pressed and fixed to the inner peripheral surface of the pipe.

The pipe inner peripheral surface protecting method according to claim 1, wherein the pipe is an existing pipe already laid.

The pipe inner peripheral surface protecting method according to claim 1, wherein the pipe is a new pipe.