"Yunnan is eighteen weird. Trains are not fast cars, they do not go abroad." This widely circulated ballad will truly become a history. In April 21st, the "color cloud" TBM (hard rock boring machine), which was co - elected the ten major power of the central enterprises with the "J 20" "C919", successfully crossed the first formation in the high Li Gong mountain tunnel in Yunnan Da Rui railway. The driving mileage exceeded 500 meters and reached a maximum of 32.14 meters per day. This marked the largest development of our country. The successful application of diameter TBM in the railway tunnel means that the first long railway tunnel in China is steadily moving towards a stable and high-yield stage.
The "color cloud number" TBM is the world's most advanced large diameter open tunnel Hard Rock Roadheader, which is the world's most advanced large diameter open tunnel with China Iron and new technology industry Limited by Share Ltd, China Iron and steel equipment combined with China iron tunnel bureau group, China Water Conservancy and hydropower fourteen Bureau group and Shijiazhuang Railway University. In August 1, 2017, the equipment was laid down in the Kunming iron and steel general assembly workshop, the length of the machine was about 230 meters, the weight of the cutter was 1900 tons, the diameter of the cutter tray reached 9.03 meters, and the blank of the big diameter hard rock boring machine of more than 9 meters in the country was filled.
Underground engineering "national team" challenges "the world's most difficult to repair railways".
The height of the high Li Gong mountain tunnel is 34.538 kilometers long. It is the first railway of China's first railway. The maximum depth of the tunnel is 1155 meters deep. The inlet section passes through 18 kinds of lithology and 12 faults, and the exit section passes through 8 lithology and 7 faults, of which 2 are active faults. As a national team in the field of tunnel and underground engineering, China Railway Tunnel Bureau has boldly explored the construction of TBM under complex geological conditions, of which 2 TBM construction is adopted for 14 km of export positive holes, and 1 inclined wells and 2 vertical wells are set up at the same time. Following the field workers taking the trolley of the front line workers to work at ordinary times and bumping into the front-line workers' construction site, it is understood that the tunnel has the characteristics of "three high" (high geothermal, high ground stress, high seismic intensity) and the "Geological Museum" in the history of Railway construction, almost including tunnel construction. All the bad geological and major risks are called "the most difficult railway in the world" in the industry.
In the tunnel construction site, the "color cloud number" TBM "power" is felt. According to the site staff, the "color cloud" work efficiency is 6 to 7 times the traditional drilling and explosion method. At the same time, it has made many innovations in strengthening the auxiliary engineering, such as adding large scale expansion design and reinforcing steel bar. In order to deal with the risk of surrounding rock deformation, fault fracture zone and rock burst, water inrush, rock burst, water inrush, high ground heat and so on, the drainage system, the immediate spray mixing manipulator system in the front area, the whole week embedded advance detection and advance grouting system, the on-line real-time advance geological forecast system and the ventilation and refrigeration system are used. In the course of construction, in the face of the maximum amount of water in excess of 700 cubic meters per hour, the geological detector is first used to find out the geological conditions ahead. Under the necessary conditions, the grouting reinforcement and drainage is carried out in advance, and the "color cloud number" is used for the excavation operation. At the same time, the disturbance and collapse of the surrounding rock can be reduced by adjusting the driving parameters. To ensure the safety of the construction.
High and new technology to build "aircraft carrier for underground engineering construction"
The tunnel of Gao Li Gong Shan is not only difficult to build, but also requires high protection for the ecological environment. The Gao Li Gong Shan National Nature Reserve is appraised by the World Wildlife Fund as one of the most important nature reserves in the world. If the traditional drilling and blasting method through drilling, loading and blasting is used to excavate the high Li Gong mountain tunnel, not only the high risk coefficient is high, but also the noise in the tunnel is large and the smoke and dust are big, it will also have an irreversible negative impact on the ecology of the protected area. Therefore, TBM came into being to solve this problem. It is an engineering equipment which integrates machine, electricity, liquid, gas, laser, conduction, measurement and prediction, and has the highest technical content. It is known as "the carrier of underground engineering construction". He Fei, vice president of the China Railway Equipment Institute and the chief designer of the color cloud, said that the "color cloud" has withstood the fault junction zone and water gushing test in the high Li Gong mountain, indicating that the tunneling machine technology in China has reached the world's leading level in the extremely complex geological conditions.
At present, the innovation team of the China railway equipment continues to perfect the tunnel boring machine product system, fully mastered the TBM machine and electro hydraulic integrated control technology, the TBM hob ring wear-resisting and toughening technology, conquered the difficult geological high precision imaging and accurate detection problem under the complex construction environment of TBM, and constructed the first international TBM construction information comprehensive suit. The service cloud platform, for the first time, has realized the accurate real-time perception of mechanical parameters of excavated rock mass on TBM face.
Seize the commanding heights of the world and create "full life cycle services"
According to Zhang Jianshe, China Railway Tunnel Bureau Da Rui railway project manager, Zhang Jianshe, after the excavation of the mileage over 500 meters, the "color cloud number" is in good condition and the technical indicators are normal, and have begun to launch a shock to the new target. China Railway high-tech industry also said that the company is still innovating product technology and engineering solutions, tightening up the world's commanding point. In the future, we will strive to build China railway equipment into the R & D center of world roadheader.
At present, the ultra large diameter of the 15 meter TBM is being developed, which has already broken through a series of key technical problems. It will provide a better solution for the tunnel construction and underground space development in China.
After the opening of the Dali Railway, the bus ride time from Kunming to Ruili will be shortened from more than 12 hours to less than 6 hours. China Railway will continue to plough Yunnan into a one-stop solution for investment, design, consultation, construction, manufacturing and service for infrastructure construction in Yunnan, create a "whole industry chain" and a "full life cycle service", remould the "Southern Silk Road" and make greater contributions to the economic and social development of Yunnan.
