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地铁3号线青秀山站完成3大节点工程
2017-08-27 07:55:47 中国青年网
地铁3号线青秀山站北端60米竖井顺利开挖见底
本报记者
赖有光 摄
本报讯(记者 覃琳)南宁地铁3号线建设迎来阶段性胜利。8月25日,我国地铁施工难度最大的车站之一南宁地铁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,标志着3号线工程进度迈上一个新台阶,同时为实现3号线的顺利开通打下坚实的基础。
据悉,青秀山站为南宁地铁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184.7米,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60米深活塞风亭,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。”据中铁隧道集团四处有限公司项目经理林锐介绍,地铁3号线青秀山站车站暗挖深埋、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。
林锐还说,青秀山站因受地形地势影响,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。同时,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。
“为了确保车站建设顺利进行,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等,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。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。”
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