Application：Rainwater pipe

Project Introduction：Located in the city's core area, this pipe was constructed in the 1970s, traversing densely populated residential zones and commercial complexe，and its structure had exhibited multidimensional aging. The pipe diameter was complex: it transitioned from DN1000 to DN700 and then back to DN1000.

Construction Challenge：

1. Required precise rehabilitation of variable diameter section, traditional rehabilitation was prone to liners misalignment due to measurement deviation.

2. Special treatment for brick arch ditch, the third section was a brick structure with uneven inner walls.