上海外环沉管隧道大修施工实践

Overhaul Construction Practice of Shanghai Outer Ring Road Immersed Tube Tunnel

摘要:

上海外环隧道作为上海首条采用沉管法施工的越江隧道，在运营二十余年后面临结构裂缝、管节接头渗漏及路面破损等多重病害影响通行安全，需进行大修。通过系统性技术治理，创新性提出接头修复方案，实施内置式沉管接头结构，确保沉管接头渗漏水得到根治。应用高模量沥青路面结构、水泥基渗透结晶型堵漏剂等新工艺、新材料，解决了隧道路面、结构裂缝等病害。大修后外环隧道结构韧性显著提升，为同类沉管隧道大修提供了重要实践范例。

Abstract:

As the first cross-river tunnel in Shanghai constructed by the immersed tube method, the tunnel of the Outer Ring in Shanghai has been in operation for over two decades and is now facing multiple issues such as structural cracks, segment joint leakage and pavement damage, which affect its operational safety and is required of overhaul. Through the systematic technical management, the joint repair scheme is proposed to implement an internal immersed tube joint structure, ensuring that the leakage at the immersed tube joints is completely cured. The new technologies and new materials of high modulus asphalt pavement structure and cement-based permeable crystalline waterproofing agent are applied to solve the diseases such as tunnel pavement and structural cracks. After the overhaul, the structural resilience of the Outer Ring Tunnel has been significantly improved, providing an important practical example for the overhaul of similar immersed tube tunnels.