The Chongde and Qingshui Tunnels are the existing eastern railway tunnels, after a long time of use and frequent earthquakes, there are structural cracks and water leaks. In order to secure the tunnel, the company is responsible for the operation of tunnel structure cracks and waterproofing of construction joints and reinforcement, pouring of silicate resin, cement filling and painting. waterproof All work was completed on schedule and with quality within 6 months.