Description
The diameter of 2.7 meters round assembly tunnel, the total length of 3200 meters, the total cost of 4 million German Mark (RMB 40 million yuan).
The main structure is adopted corrugated steel pipe, and the galvanized circular corrugated steel pipe with diameter 80cm is adopted in the feeding port.
It was built in 1992 and completed for 1.5 years. It contains pipelines for water, gas, electricity, communication and heating.
