MPP電力管の非掘削プルパイプの建設計画:パイプラインの回避とジャッキアップ

2025-08-18


MPP電力管の非掘削引張管施工は地表への干渉が小さく、施工効率が高いという利点により、都市電力パイプラインの敷設に広く応用されている。その中で、パイプライン回避とジャッキアップ施工は工事の安全と品質を保障する核心的な環節であり、科学計画と正確な操作を通じて地下パイプラインの安全な横断を実現する必要がある。

パイプライン回避:前期調査と経路最適化

パイプライン回避の前提は地下環境を全面的に把握することである。施工前に共同調査機関が「物探+掘削」の組み合わせ技術を採用する必要がある:地質レーダー、パイプライン探知機などの設備を通じて既存の地下パイプライン(給水管、ガス管、通信光ケーブルなど)の方向、埋設深さと材質を定位し、掘削と結合して正確な地質データを取得し、地下パイプラインの三次元分布図を形成する。経路計画は「安全距離優先」の原則に従う必要があり、既存のパイプラインと1.5倍以上の管径の水平ネット距離を維持し、垂直ネット距離は0.5メートル以上である密集したパイプラインエリアに遭遇した場合、「上スパン」または「下スパン」案を採用することができる。既存のパイプラインの埋め込み深さが浅い場合、上昇軌跡(勾配15)を設計し、逆に沈下迂回し、交差点のネット距離が基準を満たしていることを確保する。避けられない重要なパイプラインには、防護スリーブ(CP VC管など)を設置するか、人工掘削杭を採用して隔離し、施工の乱れを避ける必要がある。

ジャッキ施工:ガイド制御と動的調整

ジャッキ環節は「正確なガイド、安定した推進」を目標とする必要がある。機器の選択では、パイプの直径(一般的にΦ200-Φ630 mm)と地質条件(粘土、砂、岩石)に応じて水平方向の掘削機を選択し、ガイドメーター(精度20 mm/30 m)をサポートします。リアルタイムでドリルビットの軌道を監視します。建設前に、地面にガイド基準線を配置し、設計軌道パラメータ(傾斜、曲率半径)を入力し、ガイドビットに内蔵されているプローブを介して位置データをコンソールに送信し、偏差が50 mmを超えると掘削角度を調整する必要があります。時間内に。

泥壁は、ジャッキアップ建設の重要な補助手段です。砂や小石の地層では、ベントナイト泥(粘度30〜50秒)を使用して壁保護膜を形成し、細孔壁の崩壊のリスクを低減します。粘土の地層では、泥の粘度を適切に低減し、抵抗を低減でき初期段階(最初の50 m)低速推進(1-2 m/min)、軌道が安定した後、徐々に速度を上げて、パイプが不均一な力によってひび割れを起こさないようにする。

動的監視と緊急支援

建設の不確実性に対処するために、「地上+地下」の二重監視システムを確立する必要があります。地上に沈下観測点(間隔5-10 m)を設置し、地表沈下を監視します(警告値30 mm)。地下に分散型光ファイバーセンサーを使用して、既存のパイプラインの変位と応力の変化をリアルタイムで監視します。パイプラインのオフセットが10 mmを超えているか、沈下が速すぎることが判明した場合は、すぐに緊急計画を開始します。ジャッキアップを停止し、泥の比率を調整し、必要に応じてグラウト補強(セメント-水ガラス二重液体スラリー)を使用して地層を安定させます。

さらに、建設プロセス全体で安全保護を行う必要があります。建設現場を隔離するための警告エリアを設定し、地下パイプラインの緊急修理装置(封鎖装置、予備パイプなど)を装備し、パイプライン所有者とのリンクメカニズムを確立して、緊急事態への迅速な対応を確保します。上記の措置により、MPP電力パイプラインの非掘削パイプライン建設におけるパイプラインの安全な回避と正確なジャッキアップを効果的に実現し、都市の電力インフラ建設に信頼できる技術サポートを提供できます。1172779

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