Abstract:

At present, boreholes are drilled in order to install utility lines and equipment in Metro works. Borehole drilling not only causes adverse influence on the environment and the labors’ health, but also reduces the works’ service life and increases the maintenance and operation cost. Furthermore, the steel structures and equipment in operating Metro tunnels are seriously corroded. In the paper, the stateofart of the installing of the utility lines and equipment in Metro tunnels and that of the corrosion of the steel structures and equipment are investigated and problems to be solved are presented. The disadvantages of installing utility lines and equipment by means of borehole drilling technology are presented, the solution of adopting embedded part installing technology is proposed, and tests are made. Zincnickel coating corrosionproof technology is proposed to solve the corrosion problem. Conclusions drawn are as follows: 1) The full promotion of the embedded part installing technology can improve the equipment installing efficiency, improve the working environment, reduce the damages to the tunnel structure, extend the works’ service life and facilitate the operation and maintenance of the works; 2) The full promotion of the zincnickel coating corrosionproof technology can avoid the corrosion of the equipment and steel structures and can reduce the operation and maintenance cost.

Key words: Metro tunnel, utility lines, equipment installing, embedded part, borehole, service life, sliding steel channel, insulated nylon case, zincnickel coating corrosionproof technology