TYPE | Transportation Infrastructure | LOCATION | Wuxi |
MATERIAL | KIN FLAGO DR，JOYA FN EZFLEX，KINJOYA FM VERDASYS | YEAR | 2020 |
AREA | 90000㎡ |
Background
As a backbone line of the urban rail transit network, the Wuxi Metro Line 3 Phase 1 project’s waterproofing was crucial for tunnel structural safety and operational stability. The project adopted a technical strategy centered on prevention, multiple layers of defense, and reinforcement of critical details. This systematic approach ensured the entire line met Level 1 waterproofing standards. The line passes through the old city area of Liangxi District, characterized by dense underground pipelines, high groundwater levels, and the need to cross waterways like the Beijing-Hangzhou Grand Canal and Beixin River. Precise control of tunneling parameters was essential to prevent water inflow and collapse.
Solution
The project primarily used the KIN FLAGO DR HDPE pre-applied waterproofing membrane. For the station roof slab, considering the load from backfill and potential landscaping, a composite system was applied using JOYA FN EZFLEX non-curing waterproofing coating and KINJOYA FM VERDASYS SBS root-resistant waterproofing membrane. The KIN FLAGO DR HDPE membrane utilizes a unique pre-applied, reverse-bonding method. Its specialized adhesive layer forms a strong chemical bond with the subsequent concrete pour, effectively eliminating water channeling and integrating the membrane with the structure. The JOYA FN EZFLEX coating exhibits excellent creep recovery and self-healing properties, maintaining a continuous seal even with minor structural movement. The KINJOYA FM VERDASYS membrane features a chemical root inhibitor that effectively prevents root penetration, ensuring long-term waterproofing performance for the roof slab under complex loading and environmental conditions.
Outcomes
Since its opening, no structural leaks have occurred, and the tunnel environment has remained dry and stable. The comprehensive waterproofing technology was successfully applied in complex geological sections such as the Wuqiao Station to Sanyuan Station segment, providing valuable experience for subsequent lines. A standardized waterproofing construction process suitable for urban rail transit in soft soil regions was established, offering broader applicability and value.
