China News Service, Guangzhou, November 11 (Guo Jun, Xue Zhou, Luo Chen Hong) A reporter learned from China Railway Guangzhou Bureau Group Co., Ltd. (hereinafter referred to as "Guangzhou Railway Group") on the 11th that the country's largest high-speed rail business line is currently under construction. The Beijing-Guangzhou high-speed rail line from Zhuzhou West Station to Hengshan West Station is progressing in an orderly manner. The construction period will last until the end of November.
Internal combustion rail sawing machine sawing the rail. Photo by Cao Junmin
At 20 o'clock on October 20, a long rail transport vehicle slowly departed from Zhuzhou North Station, marking the official start of the high-speed rail track change construction.
The track change task totals 16 kilometers, which is the longest high-speed rail construction in the country.
At present, nearly half of the track-changing construction task has been completed.
Workers in the overhaul section of the Guangzhou Public Works are performing track change operations. Photo by Cao Junmin
It is understood that since the Wuhan-Guangzhou section of the Beijing-Guangzhou high-speed rail was opened to traffic in 2009, it has transported nearly 600 million passengers and operated more than 600,000 mobile trains.
The high-speed train leaves the rails with wear and tear day after day.
After 11 years of operation, most of the rail wear values are close to the overhaul standard, and new rails need to be replaced gradually.
Guangzhou Railway Group's Guangzhou Public Works Overhaul Section will implement the task of replacing long rails in sections.
Saw the end of the new rail photo by Chen Zhiqing
Since undertaking the task, the Guangzhou Public Works overhaul section has made sufficient preparations in the early stage of construction. The section leaders have organized professional departments and construction workshops to hold special meetings, organized high-speed rail construction training courses, carried out comprehensive safety assessments, and held a mobilization meeting.
At the same time, the section appointed Huaihua rail-changing workshop, Hengyang rail welding workshop, road material transportation workshop and self-rotating equipment workshop and other workshops with rich experience in high-speed rail construction to work together. The number of participants in the construction reached 338, which is currently the largest number of people participating in the war. A high-speed rail construction.
On-board flash welding equipment for welding new long rails photo by Chen Zhiqing
The reporter saw at the scene that the construction adopts an integrated rail-changing mode, using integrated rail-changing engineering vehicles to unload new long rails, replace steel rails, recycle old long rails, rail welding joints, and line arrangement and construction. All construction links are coordinated and smoothly connected. .
Starting point Longkou saw rail photo by Cao Junmin
According to Wang Aihua, director of the Huaihua rail-changing workshop, “Although our workshop has participated in two high-speed rail-changing constructions, this construction is more challenging than before. The difficulty lies in the daily stress relief workload. Because of this construction period. From mid-October to the end of November, Hunan has entered the autumn and winter seasons. The temperature in the early morning is low, especially in rainy weather, the temperature of the steel rail is too low, and the tensile value of the stress relief steel rail is greater, so stress relief must be done. This adds one more process to our normal construction and brings a greater test to the punctuality of the construction."
The van welder performs rail welding on the starting line. Photo by Cao Junmin
In this high-speed rail construction, in addition to replacing new rails, it is also necessary to weld the new rails on site.
It is understood that this on-site welding of rails has changed the way that the existing lines used thermite welding in the past. It uses advanced flash welding technology. Welding a joint requires rail pre-derusting, rail alignment, welding, normalizing, straightening, and precision. Multiple processes such as grinding took more than 60 minutes.
"Because the curve of this section of the high-speed rail line is as high as 140mm, which is far greater than the ultra-high value of the curve in the previous high-speed rail construction, it has brought a severe test to the field flash welding. However, we adopted box welding and vehicle-mounted welding this time. The flash welding process combined with welding not only ensures the quality of joint welding, but also ensures the punctuality of the construction!" said Xu Wei, the construction manager of the rail welding workshop in Hengyang.
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