HDPE二重壁ベローズ市営排水建設計画:トレンチ掘削と埋め戻し圧縮

2025-08-18


HDPE二重壁ベローズは、優れたリング剛性と耐変形性により、地方自治体の排水プロジェクトで広く使用されています。そのトレンチ掘削と埋め戻しおよび圧縮の品質は、パイプラインの耐用年数に直接影響し、建設仕様に厳密に従う必要があります。以下では、建設準備、掘削プロセス、埋め戻し技術の3つの側面から重要なポイントを説明します。

建設前の準備

建設前に現地調査を完了し、トータルステーションを使用して軸方向の位置決めを行い、トレンチ掘削境界線と標高制御線を解放する必要があります。地下パイプラインの分布図の確認に焦点を当て、人工ピット探査法を使用して周辺のガス、電力、その他のパイプラインの位置を確認し、安全距離を維持します。軟弱地盤や地下水位の高い地域では、地下水位がトラフの底より0.5 m低くなるように、事前に軽量ウェルポイント降水システムを設置する必要があります同時に、傾斜砂や中粗砂などの埋め戻し材を用意し、泥含有量は5%、最大粒度は50 mmを超えないようにする必要があります。

トレンチ掘削の主要技術

は、土壌の種類に応じて掘削方法を選択します。砂質土は、鋼矢板支持と組み合わせて0.5: 1の傾斜を採用し、粘性土は1:0.75で自然に傾斜させることができます。機械的な掘削では、過剰掘削による基底土の乱れを避けるために、下層を手動でクリアするために20 cmを予約します。溝の底の幅は「パイプ外径+0.6 m作業面」によって決定され、深さが5 mを超えると階段状の傾斜が設定され、階段の幅は0.5 mです。溝の底の受け入れは、平坦度20 mm/2 m、支持力120 kPaを満たす必要があります。不適格な

埋め戻しと圧縮の品質管理

埋め戻しは、3つの領域で実装されます。パイプの下部の腋窩角は、中粗砂で対称的に埋め戻され、インサートされた振動タンパーで密閉されます。パイプの上部から50 cmの範囲内で、軽量ローラーを使用して静的に圧縮します。圧縮度は90%です。パイプの上部から地面まで、振動ローラーを使用して層を重ねて圧縮します。各層の仮想舗装の厚さは250〜300 mmで、圧縮度は95%に達します。圧縮プロセス中にパイプラインの垂直方向の変形を監視します。パイプの直径が800 mmの場合、変形量は3%を超えてはならず、パイプラインの両側で非対称に埋め戻すことは固く禁じられています。雨季の建設では、トレンチの排水

品質受け入れ基準

トレンチ受け入れの主要な検査:トレンチ底部の標高偏差は30 mm、正中変位は50 mm、法面勾配は設計要件を満たしています。埋め戻しと圧縮の程度は、リングナイフ法によって検出され、50 mごとに3セットのサンプルが採取されます。パイプラインの設置が完了した後、閉鎖水試験が実施されます。試験水頭はパイプの上部から2 m上にあり、浸透水は0.05 m³/(h・km)である必要があります。建設プロセス全体でBIM技術を使用して3次元の説明を行い、インテリジェントな建設現場システムを介してトレンチの沈下とパイプラインの変位をリアルタイムで監視して、建設品質が「埋設ポリエチレン排水管のパイプライン技術仕様」(CJJ/T 29-2010)。

掘削プロセスを科学的に計画し、埋め戻し材料と圧縮パラメータを厳密に制御することにより、HD実際の施工では地質条件の動的調整案を結合し、特に雨季の排水と冬の凍結防止措置に注意して、市政排水システムの長期的な安定運転を確保する必要がある。

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