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North-Link Line Old Railway Tunnel Repair Project

The project included the repair of seven tunnels. The main works included reinforcement of lining cracks, water-stop grouting of leakage cracks and construction joints and filling cavities behind linings.The materials used were sodium silicate resin and polyurethane resin-based.As the railway was required to be operational, the works were carried out between midnight and 5am with the power off.

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