青岛市李沧区建设中的唐山路隧道（9月22日摄，无人机照片）。 据介绍，该隧道全长1551米，双向双洞8车道，最大开挖跨度31.8米，最大开挖断面447.62平方米，是我国目前最大跨度断面市政交通隧道。 新华社记者 李紫恒 摄 【1】 【2】 【3】 【4】 【5】 【6】 9月22日，青银高速公路增设唐山路互通及连接线工程唐山路隧道主体正式完工，全面进入隧道路面与装饰施工阶段。 ...

Core Viewpoint - The successful completion of the lining construction of the Tangshan Road Tunnel marks a significant milestone in the construction of the largest municipal traffic tunnel in China, providing crucial support for the overall completion of the Tangshan Road Expressway project [1][2]. Group 1: Project Overview - The Tangshan Road Tunnel is a key control project of the Tangshan Road Expressway, featuring complex construction challenges such as "multi-section conversion, small clear distance construction, and super-large span excavation" [2]. - The tunnel spans 1551 meters, designed with a dual-lane, dual-tunnel structure accommodating eight lanes, with a maximum excavation span of 31.8 meters and a maximum height of 17.88 meters [2]. - The maximum excavation cross-section reaches 447.62 square meters, exceeding the area of a standard basketball court, making it the largest excavation cross-section municipal traffic tunnel under construction in China [2]. Group 2: Construction Challenges and Innovations - The project faces significant challenges due to the complex geological conditions of the Tiger Mountain area and the need to maintain a minimum distance of only 0.5 meters between tunnels [2][5]. - To address these challenges, the construction team has implemented innovative solutions, including the use of intelligent rail-mounted vehicles and automated positioning systems to adapt to multi-section construction requirements [5]. - The project team has also optimized the concrete pouring process to ensure high-quality concrete structures, employing advanced techniques to prevent segregation and air bubble retention [7]. Group 3: Strategic Importance - The Tangshan Road Expressway serves as an important "seam line" in Qingdao's urban expressway network, connecting key routes and enhancing traffic flow [8]. - Upon completion, the project will fill a critical gap in the expressway network between the cross-sea bridge and the new airport expressway, significantly alleviating north-south traffic pressure in Qingdao [10]. - The project is expected to be completed by the end of this year, further supporting the high-quality development of the region and improving travel efficiency for residents [8][10].