the new year, with the completion of the last integral ballastless track bed pouring, it marks the completion of the ballastless track bed construction in Guangxi section of Guiyang-Nanning high-speed rail, laying a solid foundation for the next track laying construction and the opening of the whole line on schedule.
Guiyang-Nanning High-speed Railway is an important transportation link connecting two important provincial capitals in the central and western regions, an important part of the new north-south land corridor linking the "the Belt and Road", and plays an important role in boosting the economic development of the old revolutionary areas. The fifth company of China Railway 18th Bureau Group is responsible for the construction of GNZQ-2 ballastless track project in front of Guinan High-speed Railway Station, including No.2 Tunnel, No.3 Tunnel and No.4 Tunnel, with a total length of 49.647 kilometers, of which the ballastless track bed of No.4 Tunnel is 30.96 kilometers (double-track). Since
the ballastless track construction
site came into operation, the project has been facing the situation of tight construction period, heavy construction tasks under the line, and the ballastless track laying can not be carried out on a large scale. In order to ensure the rapid progress of the project, the project team, according to the remaining quantities under the line, made comprehensive analysis and scientific deployment, divided the No.4 tunnel of 90000 Dashan into eight operation sections, and four ballastless construction teams carried out the construction step by step.
At the same time, facing the practical problems of tunnel design, such as only parallel drainage tunnel, narrow logistics transportation channel, more cross-construction of construction operation surface, large production task of mixing station and shortage of raw materials supply, the project team has changed the conventional construction cycle mode by adjusting the construction organization plan many times. According to the production capacity of the mixing station, the mobilization of materials and the impact of the remaining off-line works on the ballastless track construction, each operation team shall be organized to continuously promote the laying construction for 24 hours to ensure the completion of the construction task. During the construction of the
project, the project team improved the construction progress and quality by increasing the number of managers, technicians and responsible persons of the construction working surface. Among them, track fine adjustment is the most important construction process in ballastless track construction, and the construction results of track fine adjustment determine whether the high-speed railway can meet the design speed requirements. Therefore, the project team, together with several technical teams, goes deep into the construction site to check the measurement technology and measurement results by changing hands, so as to ensure that the data are within the acceptance criteria. In the process of concrete pouring, all kinds of construction equipment are strictly prohibited to collide with the track bent, so as to avoid repeated measurement. Finally, after the concrete pouring is completed, the project team also arranges surveyors to check the geometric position of the track again, and then carry out the concrete surface and curing work.
It is reported that
the ballastless track bed is 482 kilometers long on the main line of Guinan high-speed rail, which is the first high-speed railway with a speed of 350 kilometers per hour in Guangxi. After the completion and opening of the railway, the travel time from Nanning to Guiyang will be shortened from more than five hours to about two hours, making Guiyang and Nanning enter the two-hour economic circle. It is of great significance to promote the deep integration of transportation, logistics, commerce and industry in Guizhou and Guangxi provinces.
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