High-speed railway measurement poses high challenge to the instrument

After a light rain in the morning, the sky has been gloomy. At the construction site of the Tengzhou East Railway Station on the Beijing-Shanghai high-speed railway, Jiang Hexin and four other workers cooperated with the crane to lay a type II track slab on the road. "The track plate roughing process we can use the eye to determine the positioning, but the fine adjustments behind can only rely on measuring instruments, because the fine adjustment error can not be greater than 0.3 mm." Jiang and new wipe sweat said.

Jiang Hexin's new measuring instrument is called Automatic Target Total Station. It has an accuracy of 1 second and is used for fine tuning measurement of Type II track plates and high speed turntables. According to Bian Jianguo, head of measurement of the Beijing-Shanghai High Speed ​​Rail Project Department of the China Railway 16th Bureau Group, “The previous 6-second-accuracy instrument was able to meet the measurement requirements of the railway project, and no such high-precision measuring instrument was used at all. Now it is different. To meet the need for high-speed high-precision measurement, our project department is equipped with 20 such equipment."

The biggest feature of the high-speed railway is fast, while fast, it must ensure high smoothness, high stability, high security, and high comfort. To achieve this goal, we must improve the measurement accuracy. Therefore, high-precision measurement becomes a key technology in the construction of high-speed rail. The reporter found at the construction site that there was a pair of measurement control points every 60 meters on the roadbed. In layman's terms, the more such points, the greater the density, the higher the accuracy of the measurement. In high-speed rail construction surveys, CP0, CPI, CPII, and CPIII networks form a unified benchmark for high-precision measurement and control networks. Its core role is to ensure the precise positioning of the orbital shape and position.

Yuan Zhanwen is the head of the measurement team of the Beijing-Shanghai High-speed Railway Project Department of the China Railway 16th Bureau Group. His survey team has 30 measurement technicians and 6 high-precision measurement instruments, which can be described as strong and strong. "Equipment like this was unthinkable 10 years ago. This fully demonstrates the importance of the Beijing-Shanghai high-speed rail for measurement, and engineering measurement is very promising." Yuan Zhanwen, who once wanted to abandon the measurement profession, said with confidence.

In the Beijing-Shanghai high-speed rail construction, measurement has changed from an attached specialty to a leading specialty and has become the main thread throughout the entire project—without accurate measurement, many processes cannot be developed. “For the Beijing-Shanghai high-speed rail, the measurement is like a branch of a big tree, just like a person's nerve center, like a string of shining pearls.” Zheng Xianqi, chief engineer of a division of the Beijing-Shanghai High-speed Railway Project Department of China Railway 16th Bureau Group To metaphorically said.

The fine-tuned screw on the high-speed turnout board reminded reporters of a parade of neat squares. It is said that when the soldiers trained to walk, there were strict requirements on how many centimeters feet away from the ground. In front of us, this long row of screws is exactly like a row of planes, but the uniform requirements here are more demanding and are calculated in 0.1 mm. In order to meet such strict standards, the members of the survey team have to get up at 4 o'clock every day to measure on the construction site, whether in the hot summer days or in the winter when the snow falls. In order to sort out the measurement data, it is necessary to work overtime until midnight. Although hard, they said: "Measurement is no longer a brainless task. We learned a lot of knowledge."

The measuring instruments used in the Beijing-Shanghai high-speed rail construction and the technologies used have reached the highest level in the engineering measurement industry, directly promoting the development of engineering surveys and becoming a hot topic in the academic community. On August 20th, the International Symposium on Precision Measurement Theory and Surveying and Mapping of High-Speed ​​Railway was held at Southwest Jiaotong University. Famous scholars and experts from home and abroad discussed the application of high-speed railway precision measurement theory and new mapping technologies to improve the precision of China's high-speed railways. Measuring research level. It can be said that the measurement has become the soul of high-speed rail engineering.