来源:安青网 | 2023-01-11 17:29:20 |
(资料图片仅供参考)
1月10日,伴随着盾构机刀盘旋转的轰鸣声,“穿越号”盾构机从合肥站南广场盾构接收洞门破土而出,1号线三期工程瑶海公园站至合肥火车站区间左线顺利贯通,标志着1号线三期工程顺利实现全线“洞通”。
1号线三期工程为既有运营1号线的北延段,正线全长4.54千米,线路起于天水路站,沿新蚌埠路、北二环路敷设,下穿合肥站站场及站房结构后,与既有运营1号线起点合肥火车站衔接,共设置三站三区间、天水路停车场和1.4千米出入场线段。此次贯通的“瑶合”区间全长709米,该区间盾构机下穿铁路节点工程为国内首次在无预留条件情况下,近距离正下方穿越铁路站房结构物,是合肥轨道建设历史上面对的最难考验。
为确保“瑶合”区间安全下穿合肥站站房及站场结构,合肥轨道集团扎实做好前期准备和过程管控。在下穿铁路过程中,面对铁路路基、铁轨变形控制要求极严的难题,下穿前现场设置试验段,积极收集整理各项掘进参数指导后续掘进,并严格控制下穿过程中土压、同步注浆、二次注浆、克泥效、快凝浆液及使用增注型管片等关键工序及技术措施,控制地层损失率,确保管片拼装质量优良,实现各道工序间的有效衔接。
为确保盾构接收、吊装、运输安全,合肥轨道集团对接收洞门范围区域土体进行水平注浆并固结加固,注浆深度8米;对盾构接收吊装区域下方的合肥站南广场地下停车库采用钢管对顶板主次梁节点进行支撑加固,最终实现区间贯通。记者 祝亮 文/图
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