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南宁地铁3号线青秀山站站厅顺利封顶

2017-08-26 22:40:46   中国青年网

人民网南宁8月26日电 (王勇)8月25日,南宁市轨道交通工程3号线青秀山站实现了车站明挖站厅封顶,北端60米竖井开挖见底,暗挖站台隧道全部贯通3大里程碑节点工期,按期完成了3号线阶段性建设目标。

青秀山站为南宁轨道交通3号线第17个车站,是一个地下四层明暗挖结合车站,车站总长184.7m,站厅采用明挖法,开挖深度27米;站台层埋藏于站厅层之下22米,采用暗挖法,埋深达57米。车站北端设置60m深活塞风亭用于站台隧道暗挖作业施工和相邻站点四台盾构机到达后吊出的任务。因施工需要,中间增设57米深新增竖井辅助暗挖隧道施工。车站暗挖深埋、工期紧张,场地狭窄,基坑结构超深,是南宁地铁建设难度最大的车站,也是我国地铁建设施工难度最大的车站之一。

青秀山站因受地形地势影响,经参建各方共同努力,通过邀请全国知名专家指导,考察借鉴国内外成功案例,各方联合研究论证,最终完善了设计方案,攻克了以下难点:

(1)地下水位较高,地质极差,围岩处于半成岩状,暗挖隧道开挖成型困难极大;

(2)含水泥质粉砂岩地层纵横交叉节点多小径距暗挖隧道突水坍塌安全风险大,整个暗挖隧道交叉节点多达17处,施工极具挑战性。

(3)关键线路上结构逆作超深竖井施工技术难度大,特别是79米深的钢管柱施工要求高,竖直精度必须控制在3‰以内。

(4)平面重叠、立体交叉明暗挖施工组织难度大。

在本站的建设过程中,施工方通过采用现代化施工机械辅助,超深井管降水,大直径深桩新施工技术,研究采取隧道开挖新工法新工艺等措施,不断地对建设过程中遇到的各种难题反复研究论证,并成立青秀山科研课题小组,确保了车站建设顺利进行。目前,车站明挖站厅顺利封顶,北端60米竖井开挖顺利见底,暗挖站台隧道全部贯通,按期完成了青秀山站3个里程碑节点。特别是车站暗挖隧道的按期贯通,确保了过邕江区间盾构顺利通过,同时为青秀山站两端区间盾构按时到达接收提供了条件——确保了南宁市轨道交通3号线洞通,轨通工期能够顺利实现,标志着南宁轨道3号线工程进度更上一个台阶,同时为实现3号线顺利开通打下坚实的基础。(完)

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