新建隧道与既有通车隧道交叉段施工实践  

Construction Practice of Intersection Section between New Tunnel and Existing Drive-through Tunnel

作　　者：郝才伟 HAO Cai-wei(Sichuan Datang International Ganzi Hydroelectric Co.,Ltd.,Kangding 626001,China)

机构地区：[1]四川大唐国际甘孜水电开发有限公司,康定市626001

出　　处：《北方交通》2020年第9期82-85,共4页Northern Communications

摘　　要：某水电站采用新建975m长隧道的方式避绕库岸公路病害路段,新建隧道小桩号方向从岩石边坡明挖进洞,大桩号方向从既有隧道中平交扩挖进洞。平交进洞时新老隧道小角度交叉,平交段扩挖跨度大,同时施工中既有隧道仍在通行社会车辆,拆除原隧道衬砌结构及扩挖新隧道施工安全风险高,保证洞内交通通行的难度大。为此,优化调整了施工顺序,增加了安全保证措施,确保了交叉段施工安全和工程质量,采取的措施对类似工程的施工组织具有一定的参考价值。A new 975m long tunnel is built in a hydropower station to avoid the damaged section of the highway around the reservoir bank.The small pile of the new tunnel is excavated from the rock slope,and the large pile is excavated with level-crossing expanding from the existing tunnel.The new and old tunnels cross at a small angle when entering the tunnel at the level-crossing direction,and the expanding excavation span of the level-crossing section is large.At the same time,the social vehicles are still driving on the existing tunnel during the construction.The construction safety risk of demolishing the original tunnel lining structure and expanding the new tunnel is high,so it is difficult to ensure the traffic in the tunnel.Therefore,the construction sequence is optimized and adjusted,and the safety assurance measures are added to ensure the construction safety and engineering quality of the intersection section.The measures taken have certain reference value for the construction organization of similar projects.

关 键 词：库区公路 隧道 交叉段 施工期交通 偏压 

分 类 号：U455[建筑科学—桥梁与隧道工程]