The construction of Guizhou Zhangchang railway in five years has created three world's most
Guizhou Zhangchang railway passes through Wuling mountain area from west to East. The geological structure along the railway is complex and underground rivers are complex. The ratio of bridge to tunnel is as high as 77.9%. During the five-year construction period, the builders conquered 32 risk projects such as shale oil and gas, gas, high pier and long-span bridge, ensured the completion of Guizhou Zhangchang Railway on schedule and with high quality, and created a new record in the history of Hunan railway construction.
creates three world's most important projects:
changwan Lishui bridge, located in xiane village, Liyuan Town, Sangzhi County, Zhangjiajie City, with a total length of 369.1 meters, it is the key control project with the highest technical difficulty and the largest construction difficulty in the whole line of Guizhou Zhangjiakou Changzhou Railway. A 6031 a 6031 Long Bay Lishui bridge is located in the core reserve of giant salamander (commonly known as giant salamander, the second-class national protected animal). The bridge was originally designed as an equal span bridge, with the piers in Lishui.
in order to protect the local ecological environment, the construction company, No.5 company of China Railway 11th Bureau, broke through the technical difficulties. After strict expert argumentation, the original design was changed to the present unequal span bridge. That is to say, the pier was moved to the Lishui river bank. Tang Shuanglin, project manager of Guizhou Zhangchang railway of the fifth company of the eleventh Railway Bureau of
, introduced that the bridge used new technology and new technology in construction, successively conquered the technical problems of large cantilever length in the cable-free area, large consolidation volume of tower beam, high accuracy requirements for installation and positioning of cable conduit -- in the same kind of railway low tower cable-stayed bridge, the unequal span length of the Long Bay Lishui bridge (172 M +158 m), the length of cable free zone (42 m) and the height of consolidation section of tower and beam (15.2 m) are the highest in the world. The construction of a 6031 a 6031 Long Bay Lishui bridge not only ensures the safety quality and ecological environment, but also accumulates valuable experience for the construction of the same type of bridge in the future. The biggest risk of
Construction: the
karst and karst water
Guizhou Zhangchang railway passes through more than 20 underground rivers, more than 10 high-pressure water rich faults, and there are more than 100 large karst caves, pipeline flow and other karst along the line. The traffic length of the karst area is 142.78 km, accounting for 42.5% of the total length of the line. The ubiquitous karst and karst water in
brings great risks and difficulties to the engineering construction. Liu Tingxi, chief designer of
Guizhou Zhangchang railway and senior engineer of China Railway First Survey and Design Institute Group Co., Ltd., introduced that "3S" technologies such as global positioning system (GPS), geographic information system (GIS) and remote sensing (RS) were widely used in the survey and design of Guizhou Zhangchang railway, which concentrated many disciplines such as space exploration, computer, database, artificial intelligence and geoscience The latest achievements of the science and technology group have avoided the engineering risks brought by karst and karst water to the greatest extent from the source. By adopting a series of guarantee measures such as "slope construction" and "advanced prediction" of karst tunnel, the safety and reliability of project construction can be ensured. There are 100 newly built tunnels in the whole line of
Guizhou Zhangchang railway, with a total length of 171 kilometers, accounting for 50.3% of the total length of the line. Among them, 85 kilometers of tunnels pass through the Karst Section, with large scale, complex geological conditions and great difficulty in construction. The first survey and Design Institute of
China Railway tried to adopt the form of high line and short tunnel to pass through the karst area during the survey and design, and set up the herringbone slope in the long tunnel, which greatly reduced the risk of karst water disaster during the construction period. During the construction, there has never been a karst disaster accident, which ensures the construction safety. The longest tunnel in the whole line of
: the 9044.1-meter-long Wulingshan tunnel is located in Dongxi Township, Cili County, Yongding District, Zhangjiajie City. The
Wulingshan tunnel is a class I high-risk tunnel with the engineering characteristics of "two highs and one difficulty" -- the
tunnel passes through the most complex karst landform in the world, the underground river system is complex and changeable, the karst is strongly developed, the mud and water are easy to burst, and the safety risk is high; the
project is adjacent to the famous scenic spots in the world The
project is located in a place with high mountains, steep slopes and deep valleys, many twists and turns of the access road, large height difference, cliffs on both sides, and difficult transportation. According to the person in charge of the third branch of China Railway Tunnel Group Co., Ltd. of
construction company, the construction access road passes through two cliffs, and the builders carry out blasting one by one, just as the red flag canal was built in the same year, and a road is dug out from the cliff.