Machinery roared, tower cranes and construction vehicles shuttled back and forth, and workers were busy with construction ... Walking in the streets in early summer, dark green subway construction enclosures came into view from time to time. At present, the lines under construction in Qingdao Metro have reached 10 and188km, and the network antenna extends from the main city to the west coast, Jimo and Jiaozhou. Away from the hustle and bustle of ground traffic, 1.6 million subway builders fought day and night in the secluded underground to dream of "Qingdao on the track".
At present, Qingdao is in an important period of urban expansion, and "urban diseases" such as traffic congestion are still affecting people's travel experience. Vigorously developing public transportation and improving the level of urban green travel are important measures to practice the concept of ecological civilization, achieve the goal of "double carbon" and alleviate traffic congestion. This year is a crucial year for urban renewal and construction to advance in depth. Continuing to promote the construction of subway lines is not only the demand of people's livelihood, but also the need of urban development.
The reporter learned from the subway construction development and construction headquarters along the line that at present, the 10 line under construction is advancing at full speed: the first phase of Line 6 is fully committed to the no-load trial operation at the end of the year and the target sprint in 2024. The west extension section of Line 2 and the south section of Line 8 will speed up the civil construction. Among them, the west extension of Line 2 is scheduled to open to traffic at the end of the year and in 2024. Seven lines in Phase III (Line 5, Line 8 branch, Line 9 Phase I, 15 Phase I, Line 2 Phase II, Line 6 Phase II, Line 7 Phase II) fully promoted the "three moves and one change" work, with 197 sites (* * 2 10 sites). Among them, 65 stations have entered the main construction stage, accounting for 64% of the total, and the first batch of TBM and shield have entered the site for excavation.
Phase I of Line 6:
Full sprint, no-load test run
The first phase of Line 6 is a major implementation project in Shandong Province in 2023, and it is a large-capacity backbone line running through the central city of West Coast New District. Started from 2065438+February 2009. The first phase of the project starts from Xintun Road Station in the west and ends at Ecological Park Station in the north, with a total length of 30.8 kilometers.
At the beginning of March, the whole line was opened to traffic; At the end of March, the first "Blue Dolphin" electric bus arrived at Zhumashan Vehicle Base; On May 6, the hot sliding of the trial line was successfully completed; TACS system (automatic train operation system) has entered the stage of train dynamic adjustment ... Since this year, the first phase of Line 6 has successively set a "Qingdao speed" for subway construction. At present, the project is stepping up track laying and electromechanical engineering installation. It is planned that the track will run through in July, be electrified in August, realize no-load trial operation at the end of the year and be opened to traffic in 2024.
Compared with other lines, the trains on Line 6 are the most distinctive. From the appearance, the vehicle is affectionately called "Blue Dolphin" with elegant and agile blue as the theme color and the characteristics of "high intelligence". Technically, it is not only the first unmanned subway line in Qingdao, but also the first application demonstration line of GOA4 TACS system (train autonomous operation system) in China. On the train, the traditional driver's cab is cancelled, and the driver's cab and the passenger compartment are connected as a whole; In operation, the "IQ" is superior, and it can decide whether it is fast or slow, whether it is advancing or retreating according to the environment. After the line is opened, the "intelligent train" with "brain" and "clairvoyance" will bring passengers a brand-new travel experience.
In the sense of transportation, Line 6 will greatly improve the travel efficiency of residents along the line and ease the pressure of ground traffic by passing through large communities, universities and well-known medical institutions. "From the perspective of the whole network, this line is not only an arterial project connecting the main functional areas of the west coast, but also an important part of the Jiaozhou Bay loop network of rail transit in our city." Liu Quanwei, general manager of the West Coast Construction Branch of Qingdao Metro Group, said that the line connects the West Coast Traffic Business District, Marine High-tech Zone, Lingshan Bay Film and Television Culture Industry Zone, Qingdao Development Zone and International Economic Cooperation Zone, and connects the important functional groups of the West Coast New District in series, covering the main passenger corridors. Through a transfer, the west coast urban area can quickly connect with the east coast urban area and the north shore urban area, which can promote the effective implementation of Qingdao's "three cities linkage" spatial development strategy and better support the further improvement of the development level of the west coast new district.
Phase III line:
The construction of the main structure is in full swing.
Just like laying a good foundation before building a tall building, the quality of floor construction is of great significance to the station. Only by laying the bottom plate firmly first can the subsequent main structure construction be more "emboldened". On April 25th, the First Construction Branch of Qingdao Metro Group organized a contractor to come to the construction site of Hechuan Road Station on Line 2 to observe the quality of the first floor of the first open-cut station on Line 2. The reporter saw at the construction site that dozens of workers lined up and were carrying out the binding operation of the bottom steel bar, which was smooth and rapid. The side wall construction began scaffolding, and the main structure of the station has entered a comprehensive drying stage. At present, the earthwork excavation of Hechuan Road Station has been completed 80%.
Hechuan Road Station is the third stop of the second phase of Line 2, located on the east side of the intersection of Hechuan Road and Jinshui Road. It is an island-type open-cut station on the second floor underground with a total length of 2 1 1 m. In order to speed up the construction progress of Hechuan Road Station and achieve the goal of no leakage of the main structure, under the leadership of Qingdao Metro Group, the project department, together with the project headquarters of China Railway Construction Qingdao Metro Line 2, Shandong University and other units, set up a scientific research team to deeply study the concrete mix ratio, formwork materials, release agent and other technologies and materials, and determined the construction mix ratio of high-performance concrete with better wrapping, improved fluidity and stronger workability. At the same time, a new polymer composite template is introduced. "We innovatively combine plastic formwork with stainless steel film covering, which is equivalent to upgrading the traditional plastic formwork and playing the role of 1+ 1 >; The effect of 2. Compared with traditional wooden templates and stainless steel templates, the turnover times of polymer composite templates can reach up to 100, but the cost can be reduced by half. " Guo Yougan, head of the concrete group at Hechuan Road Station, introduced.
Through innovative construction technology, the second phase of Line 2 is fully promoting the construction speed. On the other hand, the branch lines of Line 5 and Line 8 rely on mechanized equipment to speed up the excavation. On April 24th, "Pioneer" double shield TBM and "JIAOZHOU Bay 1" shield machine were successfully launched from the branch lines of Line 5 and Line 8 respectively, marking the third phase of the subway project entering a new stage of mechanical excavation. The use of TBM and shield machine is an important embodiment of Qingdao subway construction mechanization, which improves the efficiency by 10 times compared with the traditional tunneling method. The mechanical tunneling rate of seven lines in the third phase of Qingdao Metro is over 95%, ranking among the top in China. The mechanical excavation rate of Line 5 is 97. 1%, and that of Line 8 branch line is 96.4%.
The branch line of Line 8 is a rail transit line connecting Jiaozhou and Qingdao, starting from Dajian Station of Line 8 and ending at Jiaozhou Railway Station, passing through Chengyang District and jiaozhou city. At the construction site of the branch line project of Line 8, the shield machine "Yihang 1 1" with a length of about 90 meters is stepping up construction. Gantry crane, truck crane, shield machine and other equipment and on-site construction personnel outline a busy construction picture. At noon 12, the construction workers squatted in the corner of the shield starting shaft with lunch boxes. "In order to save time and speed up the construction progress, lunch is sent to the ground to eat, and after eating, continue to do it." Hao Jinxing, production manager of Dajian Station of China Communications No.1 Navigation Bureau, told the reporter that recently, the station has completed the assembly, debugging and start-up of the shield machine, with nearly 10 new managers and more than 30 workers, working overtime on the premise of ensuring safety and quality, and striving to complete the goal of tunnel penetration as soon as possible.
The first phase of Line 9 starts from Haixi Village Station and ends at Qianjin Community Station, with a total length of 16.6 km and three stations 13, mainly serving the core area of Chengyang, connecting Jihongtan Street, Chengyang Street and Xifu Town Street in series. On May 6th, Haixi Village Station of the first phase of Line 9 successfully passed the acceptance of foundation pit excavation conditions, becoming the first station in the whole line to pass the acceptance of excavation conditions, which laid the foundation for subsequent structural construction and shield launching. Previously, the first underground diaphragm wall of Zhengyang Middle Road on Line 9 was successfully hoisted, and the station officially entered the construction stage of the main envelope structure. Zhengyang Middle Road Station has four floors, and the average depth of the diaphragm wall is about 36.5 meters, which is the deepest diaphragm wall since the construction of Qingdao subway. ?
Innovation leads:
"Grasping Hands" for Building a World-class Subway
Last year, Qingdao Metro issued the Target System of Building a World-class Subway (Construction Part), which determined the target system of "1+6" for building a "safe, high-quality, efficient, green, intelligent and harmonious" subway project. After the practice of 1 year, the goal of building a world-class subway is deeply rooted in the hearts of the people, laying the foundation for the efficient and safe promotion of the third phase line. This year, Qingdao Metro will make good use of the target system and team building of building a world-class subway to accelerate the high-quality development of subway projects.
"The first-class subway system highlights the importance of innovation, solving problems with innovative ideas and improving efficiency with innovative methods." Zhang Jun, Party Secretary and Chairman of Qingdao Metro Group, said that with the comprehensive start of the third phase of the line, Qingdao Metro will systematically promote the construction technologies such as high-performance concrete, prefabricated construction, active prestressed support for long-span tunnels and pillarless stations. The third phase of the line will also adopt a number of comprehensive technologies such as integrated equipment and direct expansion evaporation and condensation system, and increase the research and application of advanced technologies such as smart construction site, smart operation and maintenance, flywheel energy storage, permanent magnet motor, new energy pipe and TACS, so as to enhance the green wisdom development level of Qingdao Metro.
Team is the basic unit of construction production and the direct implementer of project management. In the project construction section, Qingdao Metro will fully implement the team construction with "small stand+secondary distribution" as the main content and "two entrances, three rings, four pipes and five guarantees" as the main line of work, implement participatory democratic management in the first line of construction, get through the "last mile" of project management, implement all the work on the "surface", further consolidate the foundation of building a world-class subway, and stimulate the endogenous motivation of first-line builders. "Through the development of team construction, the project has changed from management personnel to all staff, which has effectively promoted the further improvement of safety, quality and efficiency of construction production." Zhang Aijun, deputy general manager of Qingdao Metro Headquarters of China Railway Construction, was deeply touched.