Reliable waterproofing is the cornerstone of long-term tunnel performance, as underground structures constantly confront groundwater infiltration, high hydrostatic pressure and harsh geological conditions that threaten structural safety and drive up maintenance costs.

OYH delivers a full suite of professional waterproofing systems tailored for diverse tunnel projects, covering drained tunnels, pressurized tunnels, cross passages and cut-and-cover stations. Our core product lines include synthetic polymer-based fully bonded membranes, loose-laid membranes and liquid-applied systems, complementing waterstops and injection accessories to form an integrated watertight solution. For unexpected leaks and fractured rock strata, OYH injection resins and grouts rapidly seal gaps, stabilize ground and block water ingress effectively.

With over a century of tunneling expertise, our solutions excel in durability and adaptability, meeting the demand for 100+ years of service life. We also prioritize sustainability and standardized construction, combining high-performance materials with on-site technical support to minimize lifecycle costs. Whether for new construction or renovation, OYH’s proven waterproofing technologies ensure robust, long-lasting protection for tunnels across all complex operating environments.