Visit to the stable code of the high speed railway of Helan to create a precision of 0.1mm with embroidery

Since the trial operation of the high-speed railway (formerly known as "Lunan high speed railway") in Japan and Lanzhou, the EMU has been running at a design speed of 350km / h, which is fast and stable. The unique skills of "coin erecting" and "water bottle stacking" are common on the high-speed railway, which is mainly due to the high smoothness of the line equipment. There are such a group of people on the high-speed railway line, who are strict in standards and strive for perfection. They use "embroidery" every day to compete in the accuracy of 0.1mm

on November 13, the reporter visited the construction site of Linyi Public Works section of Jinan Railway Bureau of China to see the participants of the high-speed railway disclose the "stable code" of the high-speed railway A 6031 a 6031 "die hard" 0.1mm a 6031 a 6031 on November 13, the sky is clear, four railway lines run through the East and the west, the opening of the riqu section of the high-speed railway of RI LAN is imminent, Li Qinghua, the leader of the intervention group of the RI LAN high-speed railway of Linyi Public Works section, walks westward along the railway line, and from time to time stoops to check the rails A 6031 a 6031 according to Li Qinghua, they are responsible for the management and maintenance of the 140 kilometer high-speed railway line between Japan and Lanzhou. As early as April this year, they began to intervene in the inspection and repair of the line quality. In order to ensure the safety and smoothness of the high-speed railway line, they must carry out three times of fine adjustment and finishing for the line equipment jointly with the construction unit before the opening, and the operators must repeatedly adjust the rails at each sleeper on the line. The fine adjustment and finishing of high-speed railway line is based on 0.1mm mark. It is much more difficult than embroidery to make the steel rail with several tons of weight move in 0.1mm Ji Wei, deputy director of the intervention group of the Rilan high speed railway of the

Linyi Public Works section, is responsible for the fine adjustment and finishing of the high speed railway lines. His working group is known as the "fine adjustment division" of the Rilan high speed railway. The so-called fine adjustment and finishing, in fact, is to improve the smoothness of the railway line by fine adjustment of the geometric dimensions of the railway line. "There are often small ups and downs or irregularities on high-speed rail lines, many of which are only a few tenths of a millimeter, invisible to the naked eye, but at a speed of 350 kilometers per hour, it may affect the comfort of passengers, which is the goal we want to eliminate." Ji Wei said

according to the technical regulations, the track gauge error of Ballastless high-speed railway line is qualified if it is within ± 1mm, but the "fine adjuster" of Jalan high-speed railway has set a "small goal" for itself from the beginning: to control the error within ± 0.5mm. However, in the actual work, they have adjusted the whole line four times, and controlled the error within ± 0.2mm, greatly improving the smoothness of the line A 6031 a 6031 bend measurement, adjustment, move a small step, then bend measurement This is the daily routine of the "fine tuning division" of the high-speed rail in the city. "We need to repeatedly measure and adjust the bolts and fasteners at each sleeper every time of fine adjustment. According to the calculation of sleeper spacing of 60cm, from Feixian to Rizhao, we need to bend down for 1.9 million times, and each person has to bend down nearly 2000 times every day." Ji Wei said. In every adjustment, there should be several processes from the measurement data to the disassembly and assembly of fasteners, and then to the fine adjustment. Each process should be improved. In order to avoid the fine influence of dust on the measurement data, a very important part of their fine adjustment work is to remove the floating soil under the fastener

"sometimes there is a problem in one place. Seven or eight consecutive places need to be adjusted, and often it's adjusted here and changed there. It needs to be adjusted again." Ji Wei said that taking three steps and two steps back is the true reflection of their work. In a short distance of 4500 meters, ordinary people can walk in a few minutes, but they need nearly 10 hours A 6031 a 6031 turnouts were measured more than 150 times in each group. In late May of a 6031 a 6031, the high-speed railway between Japan and Lanzhou entered the critical stage of static acceptance. At that time, the temperature in the Zhilan area was generally higher, and the highest temperature in Linyi area was more than 35 ℃. Hou Lin and his colleagues, who are in charge of the inspection and acceptance of the line equipment, lean down on the track under the scorching sun to see the "clues" without blinking their eyes A 6031 a 6031 Hou Lin told reporters that the turnout is the key equipment to ensure the safety of passengers' life and property, and the high quality of turnout is the first step to ensure the safety of passengers' life and property. "597, 596, 599..." With a ruler in their hands, they continuously measure the distance between each two turnout bolts to measure whether the sleeper is skewed. "All the turnout sleepers of the high-speed railway are poured on the track slab. Once the sleeper spacing error is found to exceed 5mm, the whole track slab shall be removed and replaced, so as to ensure the safety and stability of the train during operation." Houlin said There is no shelter on the summer route of

, and the heat wave is suffocating. Hou Lin and his workmates remained unmoved, squatting beside the rail and moving their bodies little by little as they measured. The back is already wet, and the sweat on the face drops to the ground, splashing on the hot rail, and then it is evaporated to dryness, leaving only a trace of black. It is understood that each group of turnouts needs to be measured more than 150 times, while Houlin's task is to carry out coverage inspection on 123 groups of turnouts in the pipe, adding up to more than 18000 data to be measured, which is only a small step in the acceptance process

entered into August, the joint commissioning and test phase of the high-speed railway between Japan and Lanzhou was started, and the dynamic detection vehicle was shuttled on the line to test the quality of the railway line under the high-speed operation of the train Zhao Xiao, a 6031
, is one of the members of the high-speed railway intervention team in this section. He and his colleagues "prick" the line equipment diseases according to the data measured by the daytime inspection vehicles, and timely repair and repair the minor diseases existing on the line in accordance with the principle of "immediate rectification of key problems and rectification of general problems within a time limit". In order not to affect the normal operation of the inspection vehicle in the daytime, the repair work is generally carried out at night. Zhao Xiao and his colleagues start at 7 or 8 o'clock every night, and can not finish until 4 or 5 o'clock the next morning. Sometimes a very small potential safety hazard will keep them busy for an hour or two Up to now, all the problems affecting the safety of the line have been eliminated, ensuring the safety, stability and comfort of the line On November 13, 2016, Wang Qingshi, an assistant engineer of the Yihe super major bridge of the high speed railway, held a flashlight and a hammer, drilled into the narrow space in the bridge support, and checked the wall cracks, bolt looseness and other safety hazards The length of the bridge is more than 100 kilometers, accounting for more than 70%. The Yihe grand bridge, which spans the Yihe River for 23 kilometers, is the longest one among the high-speed railways in the city. During the static acceptance of

, Wang Qingshi's task is to climb every bridge and carry out a comprehensive "physical examination" from inside to outside. The bridge support is the "joint" of the whole bridge, which is the most important to ensure the safety of the whole bridge. However, the height here is only more than one meter, and the shortest part is only tens of centimeters. The narrow space and complex structure make it one of the most difficult positions to check. Wang Qingshi often lies on the side of the support, uses the inspection hammer or hand to lift the dust cover on the support, and carefully looks at every detail, without letting go of any hidden danger In order to ensure that there is no dead angle in the inspection, Wang Qingshi needs to enter the dark box girder from the narrow inspection hole. Due to the lack of air circulation, people can not breathe well. In the dark, Wang Qingshi and his colleagues only used the weak light of the flashlight to "stick" on the wall and carefully inspect it. Like a woodpecker, they knocked every inch of the wall with an inspection hammer to check the concrete strength. Over time, Wang Qingshi has developed a pair of "hot eyes", which can accurately find tiny cracks of only one or two millimeters in the weak light

"be sure to look up! If you don't look up, you won't find the disease. If you don't look up, the beam will go in! " In order not to miss the top of the disease, Wang Qingshi needs to keep his head up and look carefully. The average person keeps his head up for 5 minutes, then his shoulders and neck ache, while Wang Qingshi looks at each beam for more than half an hour. During the inspection, it is sometimes found that the concrete has the disease of "honeycomb" and "pockmarked surface". At this time, Wang Qingshi will stop to check again and again, touch it with his hands and knock it with the inspection hammer, and dare to move forward after confirming it is correct

(reported by Du Huisheng, Ji Wei and Xing Ziwen of Dazhong daily)