PVC給水管村鎮給水工事案:圧力試験と配管防凍

2025-08-18


村や町の給水プロジェクトでは、PVC給水管は、耐食性、低コスト、簡単な設置などの利点で広く使用されています。ただし、複雑な地質条件や冬季の低温などの要因により、給水システムの長期的な安定運転を確保するために、建設中の圧力試験とパイプライン凍結防止リンクの制御に重点を置く必要があります。以下は、技術的ポイント、実装手順、および品質管理の3つの側面から説明します。

1.圧力試験技術仕様

1。試験前の準備

パイプラインの設置が完了したら、インターフェイスに損傷がなく、サポートがしっかりしていることを確認するために、外観検査を行う必要があります。テストにはきれいな水を使用し、水温は5°C以上である必要があり、パイプライン内の空気は排気バルブから完全に排出する必要があります。テストセクションの長さは1 kmを超え段階的昇圧操作

-予備試験段階:使用圧力の1.5倍(0.6 MPa以上)までゆっくりと昇圧し、30分間安定化した後、インターフェースが漏れていないか確認します。

-メイン試験段階:試験圧力(使用圧力の1.5倍)まで昇圧を続け、1時間安定化した後、圧力降下は0.05 MPaを超えてはならず、次に使用圧力に下げて外観検査を行い、漏れがないことを確認します。

3。特別な状況への対処

漏れ点が見つかった場合は、すぐに圧力を下げて排水し、修理後に再テストする必要があります。冬季試験では、水域が凍結してパイプが破裂するのを防ぐために、パイプラインの熱同行対策を講じる必要があります。

2.パイプライン凍結防止建設計画

1.敷設深度制御

寒冷地永久凍土層のデータは地質調査によって決定されます。たとえば、中国東北部の埋没深度は1.8 mに達する必要があり、中国北部は1.2 m以上である必要があります。

2。断熱材の選択

-屋外オープンパイプは、厚さ50 mmの高密度ポリエチレンジャケットパイプ(PEF)で断熱され、インターフェースは防水テープで密封されています。

-バルブウェルの内壁に厚さ50 mmのポリウレタン断熱パネルを貼り付け、砂利クッションを敷設して排水します。井戸の底。

3。排水不凍設計

は、パイプラインの最低点に排水バルブを設置し、冬季に停止または保守すると、パイプラインに溜まった水を排出できます。水道メーターの井戸の場合、二重マンホールカバー+ポリスチレンフォームプレートを使用して断熱し、内部に電気ヒーターを設置します(電力20 W/m)。

材料受け入れ

PVCパイプに入るには、工場証明書を提供し、壁厚偏差(10%)、落下ハンマー衝撃試験(0°Cの条件下で1 kgの重いハンマーと1 mの高さの衝撃に亀裂がない)などの検査を行う必要があります。

2。建設記録

は、圧力試験曲線、パイプライン座標標高、断熱層の厚さなどのデータを詳細に記録し、隠されたプロジェクト受け入れファイルを形成します。

3。緊急支援

は、緊急修理装置(ホットメルト溶接機、漏れ防止クランプなど)を備え、冬の検査システムを確立し、露出したパイプラインの毎日の温度を測定し、周囲温度が-10°C未満の場合に一時的な暖房対策を開始します。

は、圧力試験と不凍液計画を科学的に実施することにより、PVCパイプラインシステムの運用リスクを効果工学的実践は、上記の技術を採用した後、パイプラインの冬の故障率を80%以上削減し、漏水率を12%以内に制御し、村や町の給水保証能力を大幅に向上させることができることを示しています。プロジェクトの経済性と信頼性のバランスを確保するために、建設中に地域の気候と地質条件を組み合わせてパラメータを動的に調整する必要があります。

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