The first DSUC dual shield TBM roadheader in China has excellent performance.
14:18 on August 3rd, China's first DSUC type double shield tunnel boring machine TBM from the Qingdao Metro Line 2 Kaohsiung station more than 30 meters deep underground "broken shell", marking the construction by China Railway Construction Bureau Group eighteen tunnel, Qingdao Metro Line 2 first section TBM - high (male sea (station) Anne Road station) 20 days in advance through the section of right line. This section has created the highest monthly footage of 382 meters, the maximum daily footage of 22.5 meters and a number of the same type TBM tunnel construction record.
Qingdao Metro Line 2 high sea section is located just below the Hongkong road and Hongkong Road, the main road is a tourist city, is an important section of the whole project, TBM tunnel length of 6622 meters, the right line of a total length of 3410 meters, for the first time using the DSUC double shield TBM construction in domestic rail transportation, there is a small radius curve, driving interval the fault fracture zone is easy to machine and a series of problems such as cross construction.
According to the China eighteen Railway Construction Bureau Group Company of Qingdao subway tunnel project manager Shi Hongzhong introduced, double shield TBM with open type, single shield type and double shield tunneling mode three, according to the geological conditions and construction schedule, flexible selection of different driving mode, specially designed for the complex geology of Qingdao, can "eat soft" and at the bite bones".
It is reported that the TBM front end of the large disc diameter of 6.3 meters, above the installation of 41 cutting tools, the total length of 135 meters. TBM integrates tunneling and support into a whole, and uses rotary tools to crush surrounding rock and form integral section. It integrates machine, electricity, liquid, light, gas and information technology into one, and it is a highly intelligent and new advanced tunnel construction equipment. TBM has a high degree of mechanization, and it is safer, more reliable and faster in tunneling. The work efficiency is 8 to 10 times that of the traditional drilling and blasting method, and it has less disturbance to the surrounding buildings, less disturbance and more environmental protection. Moreover, the TBM is completely closed and does not expose the surrounding rock, which improves the safety factor of the equipment operator.
"Qingdao Metro Line 2 TBM tunneling section through the weathered granite, rupture zone, geological faults, technical risk and security risk, at the same time tunnel to reverse slope construction, mine slag and drainage problems, on adaptability and construction control equipment are put forward very high demand. The DSUC type double shield hard rock tunnel boring machine TBM has been designed, and the localization rate has reached more than 50%. Gao Zhenzhai, deputy manager of the project, introduced it.
For the "boring dragon TBM angry, face technical difficulties and construction personnel, technical experts and the parties participating in the construction project department conducted several rounds of research and demonstration of engineering project, advance planning, careful organization, and actively carry out technical research, has overcome the TBM reverse slope construction difficulty, tail water, slag accumulation difficult segment the high temperature, damp heat and other difficulties, to ensure the safety, quality and efficient construction. Shi Hongzhong, a project manager, invented the patent fire safety warning system for tunnel boring machines, which overcomes the shortcomings of the failure rate and false positive rate of fire alarm system for tunnel boring machines, and successfully solves the problem of TBM electromechanical high voltage equipment, mechanical and electrical and liquid aging. "DSUC type double shield TBM fast receiving and launching and arrival station technology" by TBM technology to achieve fast curve space station, quick station process from the initial day space of 20 meters, 50 meters a day to improve the space, using the simple and fast installation of counter force frame, ensure that the TBM two days in the origin, Qingdao Metro Group Innovation prize. To improve the QC results of increasing the first pass rate of DSUC TBM segment assembling, we must strictly control the travel difference and shield tail gap according to the driving parameters, so as to improve the speed and quality of segment assembly.
"As the 2 line control project TBM construction, the high sea area ahead of time marks the phased and significant achievement of Qingdao Metro mechanization construction, which has won precious time for the follow-up work." Duan Wenming, the project secretary, said.
China railway eighteen Bureau Group Company of Qingdao subway tunnel project has made Qingdao subway construction advanced unit in Shandong province and municipal engineering safety and civilized construction site, a major project in Qingdao City, Qingdao City, the collective labor competition "pioneer workers, Chinese railway construction of Qingdao Metro advanced units honorary title, the project manager Shi Hongzhong has won the Qingdao Federation of trade unions the workers vanguard" and "the most beautiful Qingdao Ironman", Qingdao Metro Group "outstanding project manager" and other awards.
According to the Qingdao Metro Group responsible person, Qingdao Metro Line 2 as the main line connecting the East and west of Qingdao, in the north, a total length of 25.2 km, all off the assembly line, a total of 22 stations, 21 intervals, 1 vehicle base, 1 building and control center, the construction of 19 stations and the 17 interval has been completed.
