大跨度隧道下穿高压输电铁塔施工技术研究.docxVIP

公路工程Vol． 38，No． 4第 38 卷，第 4 期 2 0 1 3 年 8 月Highw 公 路 工 程 Vol． 38，No． 4 第 38 卷，第 4 期 2 0 1 3 年 8 月 Highway Engineering Aug ． ，2 0 1 3 大跨度隧道下穿高压输电铁塔施工技术研究 张 震1 ，钟放平2 ，阳军生3 ( 1． 湖南省高速公路管 理 局，湖 南 长 沙 410000; 2． 湖 南省长湘高速公路建设开发有限公司，湖 南 长 沙 410075) 410200; 3． 中南大学 土木建筑学院，湖南 长沙 ［摘 要］ 三车道大跨度李家冲隧道在施工过程中需要下穿一高达 57 m 的高压输电铁塔。通过地表注浆、框 架梁加固塔基、塔基扩大和托换的联合加固措施，并结合三台阶留核心土隧道施工方法，顺利完成了该隧道的施 工。介绍了李家冲隧道及高压输电塔的综合处置设计方案以及具体的施工过程。现场监测数据表明该设计方案 可行，不仅确保了隧道安全贯通，又保证了高压输电铁塔的正常运行，取得了良好的经济、社会效益，可为以后其他 类似工程的设计和施工提供借鉴。 ［关键词］ 大跨度隧道; 下穿施工; 塔基加固; 高压输电铁塔 ［中图分类号］ U 456． 3 ［文献标识码］ A ［文章编号］1674 — 0610( 2013) 04 — 0153 — 04 Study on Construction Technology of Large-span Tunnel Under-passing High Voltage Transmission Tower ZHANG Zhen1 ，ZHONG Fangping2 ，YANG Junsheng3 ( 1． Hunan Expressway Administration Bureau， Changsha， Hunan，410000， China; 2． CHANG- XIANG highway development Co． Ltd，Changsha，Hunan 410200，China; 2． School of civil and archi- tecture engineering，Central South University，Changsha，Hunan 410076，China) ［Abstract］ Lijiachong tunnel is a three lanes large-span highway tunnel． During the construction， the tunnel need under pass through a high voltage transmission tower up to 57 m． Some reinforcement methods were adopted，such as ground surface grouting，reinforcement of transmission tower foundations using H framed girders，enlarging and underpinning of the transmission tower foundations． At the same time，the tunnel construction method of three-step excavation with core was used． By using of these meth- ods，the construction of tunnel were successfully completed． The design and construction of Lijiachong tunnel and comprehensive treatment on the transmission tower are introduced in detail in this paper． The field measurement data have shown that the proposed design scheme is feasible，which can not only en- sure the safety of tunnel construction，but also ensure the normal operation of the high voltage transmis- sion tower． This project has achieved good eco