4月6日，镇广高速王通段春在隧道左线贯通。至此，历时7个月，春在隧道顺利实现双幅贯通。该隧道全长1342米，是全线第二座双幅贯通隧道。
春在隧道地质构造复杂，施工难度大。自开工以来，四川铁投集团所属镇广高速公路公司落实规范化管理，精细安排资源保障要素，精准采取调控纠偏措施，在确保质量安全的前提下，按照预定工期实现春在隧道双福贯通。
截至目前，镇广高速王通段已相继贯通7座桥梁和3座隧道，其中双幅贯通隧道2座。主线路基土石方挖填基本成型，路面水稳已进入施工阶段。主线桥梁下部结构已完成80%，梁板预制已完成42.82%，架设已完成34.39%。隧道单洞进尺已完成83.55%。路面摊铺、房建施工、机电工程、交安工程等正稳步推进。
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