[History of Haichuan Pipeline] The first tunnel across the Yangtze River constructed using drill and blast method

The air in the interface shaft 60 meters underground is not stuffy. In front of the reporter, the tunnel where the gas pipeline is placed is 1.8 meters high and wide. The gas pipeline is at the bottom left of the tunnel. Two welders are making final inspections of the pipeline interface. Walk forward about 50 meters, which is where the new pipeline will interface with the old pipeline in the future. Deputy Manager Hao introduced that we are currently located more than 20 meters under the Yangtze River bed and 60 meters above the ground. Because the tunnel will naturally seep water, two high-power water pumps have been working during the work. “We judge whether the pipeline is leaking by observing whether there are bubbles emerging from the water. This is the first time water has been pumped out since the tunnel was completed in 1999. ” In order to protect the pipeline from erosion, the gas pipeline is wrapped with three layers of polymer material. Deputy Manager Hao said: “Natural gas is being transported from Toutang Gas Storage Station to Nan'an District, which is related to the gas consumption of 170,000 people. ”

exist* * In construction and urban construction projects in various places, various large-scale pipelines (including urban main pipelines and long-distance pipelines outside the city) will inevitably encounter the problem of having to pass through large rivers. Especially in cities like Chongqing where two large rivers converge, various types of natural gas main pipelines cross or cross the Yangtze River and Jialing River in as many as ten places, which consumes very expensive investment. Therefore this problem is * * and municipal construction in various places are extremely important, and it is indeed a subject that needs to be seriously studied and solved. The design, urban construction, fire protection and other departments of the Yangtze River Bridge and the Dafo Temple Yangtze River Bridge do not allow natural gas pipelines to pass through. Moreover, Article 27 (5) of Chapter 4 of the "Urban Road Management Regulations" (State Council Order No. 198) implemented from January 1996 to January 1996 clearly stipulates that gas pipelines with a force >04MPa are strictly prohibited from passing on bridges. It can be seen that in fact this solution is very difficult to work.

There are several options for various types of large pipelines to pass through rivers: 1.1 Erecting them on the piers of existing or under-construction highway bridges or under the sidewalk is undoubtedly the most economical and convenient option. However, the implementation of this plan is often not allowed due to various restrictions (especially pipelines with certain risks such as gas and oil transmission). For example, in 1980, Chongqing City erected a natural gas main pipe (maximum working pressure) on the steel beam of the Shangqing Temple Jialing River Bridge.

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Mr. Yu: When was it built?