首洞贯通！兴业快线（北段）取得重大阶段性进展
12月23日，由长正建设与上海隧道共同承建的兴业快线（北段）合并段左洞传来最后一声炮响，洞内隧道掌子面实现前后贯通，成为该项目首个贯通的隧道，标志着兴业快线（北段）工程取得重大阶段性进展。
本次贯通的兴业快线（北段）合并段隧道左洞位于凤凰山内，全长2.2km,单向三车道,该隧道的贯通标志着工程施工如期实现了第一个重要工程节点，隧道施工重点开始向衬砌、机电安装、装饰装修、桥梁施工等方面转移，工程也将全面掀起施工高潮。
合并段隧道是兴业快线（北段）地质条件最为复杂的线路，施工洞口属强风化围岩，有小型断裂带，且水库正常水位高于隧道开挖面约7m，给工程施工带来严峻的考验，特别是今年以来，新冠肺炎疫情迫使项目建设按下暂停键，其中山谷转换段节点由于施工班组全部来自湖北，直至今年5月才实现复工，相较于其它节点晚了两个月。
▲兴业快线（北段）工程山谷转换段航拍
▲兴业快线（北段）工程梅华段航拍
对此，珠海市公路事务中心组织参建各方集思广益、周密策划，化解安全风险。设计勘察单位积极优化施工线路，降低安全风险；监理单位认真审核各项施工方案，严格把关；建设单位、施工单位邀请中国工程院院士陈湘生及其深圳大学团队到兴业快线（北段）进行临近建筑物近接爆破施工科研攻关。
辛勤的努力，换来丰厚的回报。工程开工以来，长正建设、上海隧道在各参建方的共同配合下克服重重困难，不畏艰险，砥砺前行，采取加长明洞、暗洞明做、加强管棚、超前注浆、超前地质预报等积极措施，严格按照施工方案和“管超前、严注浆、短开挖、强支护、早封闭、勤量测”的原则进行施工，有效降低了施工风险，顺利完成强风化地质条件下进洞施工、大断面CRD加连续洞柱工法施工、临近水库施工、地质条件突变情况下流沙层施工，牢牢守住安全质量底线，胜利实现兴业快线（北段）首洞贯通。
当前兴业快线（北段）建设已进入关键期，我司将加快推进项目进展，全力以赴冲刺全线贯通的总目标，将兴业快线（北段）打造成为我市交通基础设施建设的优质标杆工程，为市民创造更加便利、舒心的出行条件。
▲兴业快线（北段）合并段隧道左洞位置示意图
兴业快线（北段）工程是珠海单次投资体量最大的市政交通道路项目，也是珠海市首条整体按PPP模式推进的道路建设项目，总投资约64亿元，由珠海兴格投资有限公司负责建设管理，长正建及上海隧道共同建设。
作为珠海“六横十纵”干线路网骨架格局中的重要“一纵”，项目南起兴业路，主线向北绕过大镜山水库，在凤凰山谷段分为东、西线，东线向北至港湾大道—唐乐路交叉口，西线向北接哈工大路与软件园路交叉口。项目共分为大镜山节点、山谷转换段节点、东线节点、西线节点四个节点，其中大镜山节点主要负责合并段隧道两个隧道口以及梅华路下穿隧道、大镜山排洪渠施工。
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