Yimeng old district steps into "high speed railway era" -- written at the opening of riqu section of the high speed railway

On November 26, Rizhao Qufu section of Rizhao Lankao high speed railway, designed by creec and constructed for more than three years, was officially opened for operation. As the first high-speed railway in the old revolutionary area of Yimeng, it ended the history of no high-speed railway in Linyi and ushered in the "high-speed railway era" in the old revolutionary area of Yimeng The riqu section of the

high speed railway is located in the south of Shandong Province, with a total length of 235 km and a design speed of 350 km / h. There are 8 stations in Rizhao West, lijiazhai, Ju north and south, Linyi north, Feixian north, Mengshan, sishuinan and Qufu east along the whole line. Except Rizhao West and Qufu East, all stations are newly built, with an initial operation speed of 300 km / h The highlight and breakthrough of the project is to connect the busy Beijing Shanghai high-speed railway through the connecting line at Qufu east station without reservation. In order to connect with the Beijing Shanghai high speed railway smoothly, it is necessary to add two connecting lines on both sides of the Beijing Shanghai high speed railway line for the up-down conversion of trains. Therefore, creec will increase the subgrade width of Beijing Shanghai high speed railway by adopting the method of "side width" in the design to facilitate the laying of connecting lines. However, the ballastless track is adopted in Beijing Shanghai high-speed railway, and the subgrade settlement is measured in mm, which requires extremely strict deformation. After the subgrade is widened, the new filled rock will produce additional forces in multiple directions on the Existing Subgrade of Beijing Shanghai high speed railway, which will affect the operation safety of Beijing Shanghai high speed railway. Finally, through repeated tests, the technical personnel of creec decided to use lightweight concrete with two-thirds less weight and higher strength than traditional materials in the selection of widening subgrade filler, and no need to use heavy equipment to roll after the filler. In this way, the influence of subgrade widening on the subgrade settlement of Beijing Shanghai high speed railway is minimized, and the interference of large equipment rolling construction on the operation of the existing Beijing Shanghai high speed railway is avoided

solves the problem of "Widening" of Subgrade of Beijing Shanghai high speed railway, and there are some problems in the construction process. In conventional subgrade construction, pile foundation shall be driven first, and then concrete shall be poured. However, in order not to affect the normal operation of the Beijing Shanghai high-speed railway, the construction time is strictly limited to a few hours at night. Even if the piling is not completed, it must stop at the time. In this way, there will be high-speed rail operation on one side and hollow section underground on the other side, which will result in greater operational risk. Moreover, the height of conventional piling equipment is usually more than 20 meters, and the construction site is close to the Beijing Shanghai high-speed railway. Once the standing equipment is dumped, the consequences are unimaginable

in order to ensure "no risk" in the construction process, creec has adopted the technology of full casing and full rotation bored cast-in-place pile to realize "two synchronization", that is, when drilling and borrowing soil, the casing shall be laid down synchronously to ensure no deformation of the foundation; when pouring concrete, the casing shall be taken down in the same step to reduce the height of the drilling machine and reduce the safety risk. This technology not only ensures the quality of bored pile foundation, but also reduces the height of equipment to 9 meters, reducing the impact of operation on operation safety. In addition, during the whole construction period, a full-automatic monitoring system has been set up for the 3-kilometer-long construction area of the whole East Qufu station, with more than 2000 detection points set up to monitor minor changes in real time

through repeated scheme demonstration and test, creec relies on a complete set of design and construction technical scheme, and finally realizes the connection of new high-speed Ballastless railway without reservation conditions in Qufu east station of Beijing Shanghai high speed railway, creating a "hard connection" for the operation of high-speed Ballastless railway, which is another "first" for the construction of high-speed railway in China Wu Yongjie, deputy director of Passenger Transport Department of

China Railway Jinan Bureau Group Co., Ltd., introduced that the riqu section of the high-speed railway between Japan and Lanzhou is the first high-speed railway crossing the old area of Yimeng, which plays an important role in improving the high-speed railway network of the old area of Yimeng and driving the development along the line. In the future, cities within the old Yimeng area, such as Linyi, will enter the one hour "traffic circle" of Jinan and be included in the two hour "traffic circle" of Shandong Province. It will only take more than three hours from the old area to the capital Beijing. With the opening of Rizhao Qufu section of the high-speed railway, the scale of Shandong high-speed railway network has been expanded again, and the connectivity between cities has been continuously enhanced. This new line has achieved circular connection with Jinan Qingdao high speed railway, Jiaoji passenger dedicated railway, Qingdao salt railway and Beijing Shanghai high speed railway. The "one ring and two cores" high speed railway network structure in Shandong is more perfect. The circular high speed railway network with Jinan, Qingdao, Linyi, Rizhao and other regions as its fulcrum greatly shortens the travel time of the people along the line. (reporter Zhao Qiuli, Feng fan)