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The disease characteristics are accurately studied and judged through refined detection on site aiming at such composite diseases as sedimentation, leakage and structural aging that have become prominent during the operations of closed conduit for diversion closed conduit of Baotou Steel for over 65 years. The systematic comprehensive treatment scheme is established by adopting the collaborative dredging technology of “horizontal directional drilling machine+ dredging vehicle with high-pressure water jet” and graded leaking stoppage technology of composite grouting as well as combining with the full-process closed-loop construction monitoring system. The water transfer function of closed conduit is fully recovered, conveyance capacity is increased from 30% before treatment to 5 m³/s, the designed flow rate of water transfer and service life of structure is extended by over 15 years after implementing this scheme, which provides the reproducible and propagable technological paradigm for treating aged water conservancy facilities in the Yellow River basin.

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针对包钢引水暗渠运行65年以上凸显的淤积、渗漏、结构老化等复合病害，通过现场精细化检测，精准研判病害特征，采用“水平定向钻机+高压水射流清淤车”协同清淤技术、分级复合注浆堵漏技术，结合全过程闭环施工监测体系，构建系统综合治理方案。该方案实施后，暗渠输水功能全面恢复，过流能力从治理前的30%提高至设计输水流量5 m³/s，结构使用寿命延长15年以上，为黄河流域高龄水利设施治理提供了可复制、可推广的技术范式。

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周振宇（1969-），男，内蒙古包头市人，高级工程师，现从事建筑工程检验、检测、特种施工技术管理工作。

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周振宇（1969-），男，内蒙古包头市人，高级工程师，现从事建筑工程检验、检测、特种施工技术管理工作。

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