PEパイプ地方自治体の埋設給水の建設計画:ホットメルト接続と沈下対応

2025-08-18


PE管は、耐食性と柔軟性の特性から、地方自治体の埋設給水に広く使用されています。建設中は、給水システムの長期的な安定運転を確保するために、ホットメルト接続の品質と沈下対策の管理に焦点を当てる必要があります。

PEパイプのコア接続プロセスとして、ホットメルト接続は操作仕様に厳密に従う必要があります。建設前にパイプの外観を確認し、傷やへこみがなく、ポートが平らであることを確認する必要があります。特殊なホットメルト溶接機を使用する場合は、パイプ径の仕様に応じて加熱温度(通常19010℃)と加熱時間を設定する必要があります。加熱プレートが均一な溶融状態を示した後、パイプをすばやくドッキングし、インターフェイスが冷却および硬化するまで指定された圧力を維持します。接続が完了した後、接合部が均一なフランジを形成し、仮想溶接や溶接漏れがないかどうかを確認する必要があります。必要に応じて、圧縮試験を実施します。試験圧力は、作業圧力の1.5倍以上である必要があります。

地方自治体の建設における一般的な基礎沈下の問題を考慮して、設計と建設の複数のリンクから予防および管理措置を講じる必要があります。パイプラインを敷設する前に地質調査を実施し、軟弱な土壌層を段階的に砂と石で埋め、圧縮度が90%になるまで層ごとに圧縮する必要があります。パイプラインの基礎には、厚さ150 mmの砂クッション層を使用し、接合部にコンクリート支脚を追加して補強する必要があります。埋め戻しには、粒子サイズ50 mmの無地または砂質土を使用し、層ごとの埋め戻しの高さは300 mmを超え道路や地質複雑な地域を横断するために、「パイプ橋」を敷設したり、ベローズ補償器を設置したりして、PEパイプ自体の柔軟性を利用して沈下応力を相殺することができる。

施工中に環境適応性の調整にも注目する必要がある。冬の施工時、ホットメルト接合前にパイプを5℃以上に予熱して、低温脆裂を避ける必要がある夏の高温時に日よけ措置を講じて、パイプの熱膨張変形を防止しなければならない。同時に、施工記録を作成して、ホットメルトパラメータ、地盤処理データ、沈下観測結果などを含めて、完全な技術ファイルを形成して、後期メインテナンスに根拠を提供する。ホットメルト接合技術と沈下防止技術を科学的に応用することで、PEパイプ給水システムの安全性と耐久性を効果的に向上させ、市政工事の長期運営ニーズを

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