Lanxin Railway's second double-line construction site: roadbed maintenance like taking care of children

Urumqi, September 20th: Since the Lanzhou-Xinjiang Railway’s second double-line Xinjiang section was resumed construction at the beginning of this year, all construction units have seized the golden period of construction, and stayed up and down at the construction site, entering September, the second double-line Xinjiang section of Lanxin Railway. The completion of the offline project has been completed, and the laying of the ballastless track has been fully rolled out.

It is reported that the second double-line Xinjiang section of the Lanzhou-Xinjiang railway uses ballastless track monolithic ballast, and the ballastless track is the current domestic advanced track bed technology. It has low maintenance workload, simple structure, strong integrity, high line load, and high vehicle stability. Many advantages have been brought about for the first time in the large area of ​​Xinjiang. With many curiosities and doubts, the reporters from the China-Singapore network drove more than 90 kilometers from Urumqi to the construction site of the ballastless track in the Dabancheng section of the second double line of the Lanzhou-Xinjiang railway. They explored the ballastless track.

In the second section of the Lanzhou-Xinhua railway, the second section of the Dabancheng area, which runs through the Tianshan Mountains and passes through the Dabancheng Wetland and Wind District, spanning the Baiyang River and the Tuwu Grand Highway. It is a total length of 42.382 kilometers and is the Lanzhou-Xinjiang Railway. A section of a relatively difficult project. At the construction site, we saw that under the towering wind power generators, the gusts raised the dust from the construction machinery. The white concrete belt was like a silver chain hanging across the sky. It was spectacular. On the roadbed slope, a triangular-framed cart appeared before the eyes and was slowly moving on the track.

“This is not easy to encounter.” Chen Jiashun, secretary of the Party Working Committee of the Lanzhou-Xining Second Line Project Department of the 12th Bureau of the Chinese Railways, said: “This is called the fine adjustment of the bed board. Before the concrete bed is poured on the bed, it must undergo rigorous testing and be used for temporary laying. The tool rails and fine-tuning trolleys can be used to tune track bed flatness, geometry, and other data.” As a matter of fact, the trolleys set up on the rails went forward again and the technicians stopped the trolleys on the trolleys. A new round of debugging was started before loading the computer equipment. Under the tool track, the reporter saw that the concrete support layer, the rail bed reinforcement frame, and the dual-type rail sleeper were stacked and stacked, and the steel frame structure was staggered into a net, and several layers of structures were densely weaved together. On both sides of the track bed, the concrete forming board has been erected. The entire track bed resembles a long trough. According to the introduction of Chen Shuji, the accuracy required for ballastless track laying is very high. The fine-tuning operation is to adjust and adjust the foundation structure waiting to be poured, and then cast concrete into the formwork to firmly fix the support layer, the track bed board and the sleeper. Together, form an overall ballast bed.

It is understood that the ballastless track belongs to the supporting project of high-speed railways. In addition to the basic layer of the overall casting, three layers of high-plastic plate, backing plate and steel plate are also installed on the contact surface of the rails and sleepers to reduce vibration.

As we approach the new track bed, a beach of water is clearly visible. The workers are covering the bed with a quilt and take fixed measures. "Take them like taking care of children." Zhou Lilong, a tanned project engineer, said with a smile: "The newly constructed road bed should cover three kinds of protective layers, first the hydrophobic protective film, then the geotextile, and the next layer is Tarpaulin, this is to do a good job of concrete health, to ensure that the technical standards, this process usually takes 28 days to complete, bed care like taking care of children must be carefully ".

According to Zhou Lilong, the maintenance work is mainly to avoid excessive dispersion of concrete water, and the maintenance work will directly affect the strength and durability of the track bed. Waiting for the completion of the construction of the full-line track bed, it will be able to enter the laying of a seamless long track.

Near the afternoon, the winds in the construction area slowly grew up. Under the wind and sand, the cover on the roadbed was set off by waves. The construction area is located at Chaiwopu, the Dagucheng air outlet. The lack of water and strong winds have made the bed maintenance a problem. In order to solve the problem of conserving water for concrete, the construction team drilled wells near the construction area to make construction water available. The second division chief of the 12th Lanxin project of the China Railway Group, Nie Qingwen, introduced to me: “The construction of ballastless tracks in the Gale district was the first time we did this, but it also accumulated valuable experience for us. The water problem was solved. Next, we are planning to use mobile tent assisted construction, and use a tent about 100 meters long to cover the operation area, so that the impact of bad weather conditions can be reduced.The effective construction period will be expected to increase by 2 months. 'The newly built ballast bed is safe."

It is understood that as of the 19th, the construction of the ballastless track support section of the No. 8 double tender section of the Lanzhou-Xinjiang Railway has completed 39% of the entire project, the construction progress is orderly and controllable, and the completion of the seamless long-track construction has been completed. Afterwards, the overall project will end at the end of 2013. With the steady progress of project construction, the days of the opening and operation of the second double-line project of Lanzhou-Xinjiang Railway are getting closer and closer to us.

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