Lijiahe Reservoir is the core water supply hub in the east of Xi'an City, which bears the water demand of nearly 3 million people. With the acceleration of the city's eastward expansion and population concentration, the carrying capacity of the original single-line water conveyance canal tends to be saturated, the water pressure is insufficient at the peak of summer water consumption, the seasonal water shortage in the plateau area occurs frequently, and there is no spare water conveyance channel, the hidden danger of pipeline maintenance and sudden danger exists, so the water conveyance quality improvement is imminent.
"This double line is the'water lifeline 'of three million people in the east of the city." The words of the person in charge of the project express the great weight of the project.
In 2022, the construction of the double-line project of the main water conveyance canal of Lijiahe Reservoir will be started, with a total length of 7. After the completion of the project, a double-line standby water supply pattern will be formed with the original main canal, covering the eastern suburb group, Lantian, Yanliang and other areas, and thoroughly solving the livelihood problems such as water shortage in the plateau area and low water pressure at the end of the pipeline network.
2. Aiming at the construction problems of vertical and horizontal valleys, complex strata and ecological and environmental protection in Qinling Gorge, the project department abandons the traditional full support technology, innovatively adopts the large-scale slot-making machine span-by-span cast-in-place construction technology, and precisely controls the core parameters such as the axis deviation of the equipment through the hole and the deflection of the main beam. Relying on three-dimensional simulation modeling to simulate the whole process of construction, special plans and contingency plan are formulated, and closed-loop management and control system is constructed. In December 2025, the project successfully completed the first grooving machine through the hole operation, and all the accuracy indicators were better than design standards. During the
construction, the team insisted on data empowerment and quality improvement, continuously optimized the process flow, compressed the auxiliary operation time, strictly controlled the accuracy of formwork joints, and greatly improved the construction efficiency and quality. At present, the main construction of the project is steadily advancing, and many key nodes have landed smoothly. The project not only makes up for the shortage of water supply in the eastern part of Xi'an, builds an emergency water supply system for drought and sudden danger, but also helps enterprises to overcome the core technology of large-scale hydraulic structures construction in mountainous areas, and consolidates the foundation of water market development.
2023, the comprehensive treatment project of drainage facilities in the Ming City Wall area was listed as a key livelihood project in Xi'an, and the construction scope of the second bid section of the project undertaken by the First Bureau of China Railway covers the west of West Street in the city wall.
"The particularity of this project is that it is an operation in the heart of history and culture." The project leader described it this way. Faced with challenges, the project team adheres to the principle of "cultural protection first, people's livelihood first, quality first", innovatively adopts the minimally invasive combination construction technology of "pipe jacking + directional drilling + slotting + ultraviolet curing Trenchless repair", and precisely repairs the underground drainage vein of the old city like minimally invasive surgery.
In view of the different scenarios such as narrow streets and lanes, inability of large machinery to enter, poor traffic on main roads, noise reduction and disturbance reduction in busy sections, etc., the project department classifies and implements measures to complete the laying of narrow lanes and pipelines through directional drilling technology, renovate old pipelines and prolong the service life of pipelines by using ultraviolet curing technology. Big bore slurry balanced pipe jacking technology is used to reduce ground disturbance. At the same time, in view of the super management and control risk of three pipelines crossing the Ming City Wall, the team has gone through several rounds of scheme optimization, selected low-vibration construction equipment, controlled the vibration of the city wall foundation at millimeter level, laid out more than 100 monitoring points for real-time dynamic monitoring, and strictly adhered to the bottom line of cultural relics safety. During
the construction period, the project department carried out grid warmth management, set up exclusive road leaders, convenient stations and consultation hotlines, staggered peak construction, silent operation, spraying dust, and actively repaired damaged pavement to minimize disturbance to the people. Relying on the joint construction of the Party to carry out voluntary services, cultivate people's livelihood services, and win the recognition of the masses and businesses along the line. After the completion of the project, the drainage capacity of the area will be upgraded to the standard of rainstorm once in 50 years, basically eliminating the water accumulation points in the old city, and providing a "one-bureau model" for the renovation and transformation of the underground pipeline network in the historic and cultural city.
For a long time, the resources of flood control and emergency rescue in Northwest China have been scattered, and the efficiency of emergency disposal in extreme weather has been limited. In order to make up for the shortcomings of regional flood control infrastructure, Xi'an Drainage and Waterlogging Emergency Rescue Base Project has been approved and approved, and has been recognized by the Ministry of Housing and Construction as one of the first eight national drainage and waterlogging emergency rescue bases in China. It is also the only national main base in Northwest China. In the future, it will base itself on Xi'an, serve Shaanxi and radiate Northwest China, and undertake cross-provincial emergency rescue tasks.
"Emergency facilities should not only be'fast ', but also'easy to use'.". Only by laying equal stress on construction and utilization can base quickly form its actual combat capability after its completion. The project manager said. The team innovatively establishes the quality control system of "three customs and three inspections", strictly controls the implementation of raw materials, construction technology and nodes, regularly carries out inspection and supervision, and guarantees the quality of the project in an all-round way. In
April 2026, the main works of the project passed the multi-party joint completion acceptance and received excellent evaluation from the competent authorities. After the base is put into operation, the centralized and standardized management of flood control materials, equipment and personnel will be realized, and the time of emergency response to waterlogging will be greatly reduced, which can not only guarantee the daily drainage and rescue needs of Xi'an, but also support the coordinated rescue of floods in Guanzhong and Northwest urban agglomerations, and strengthen the bottom line of flood and drought disaster prevention in Northwest China.
From the Lijiahe water supply project in the depths of Qinling Mountains, the upgrading and transformation of the underground pipeline network in the old city of Ming Dynasty, to the construction of the flood control and emergency hub along the Weihe River, the three key projects have constructed the whole chain system of urban water safety of "water source guarantee-pipeline network transportation-emergency bottom-up". At the same time, the First Bureau of China Railway has successively undertaken Jixi Erosion Ditch Control Project, Reservoir Maintenance Project, Ecological Restoration Demonstration Project, Nanchi Diversion Pipeline Project of Doumen Reservoir in Shaanxi Province, Xi'an Water Environment Comprehensive Treatment System Project, Hanjiweibahe Waterworks Project, Yaozhou Section of Qishui River in Tongchuan. A large number of water conservancy projects, such as the construction of Jiangwan Reservoir dam, spillway and irrigation area in Yulong County, have become the vivid "first" practice of the transformation and development of China Railway First Bureau. The development road of
deep cultivation and transformation enables enterprises to precipitate core technologies in actual combat, master special technologies such as mountain water conservancy construction, Trenchless pipe network repair, intelligent water conservancy supporting, large-scale emergency hub construction, and form a standardized and replicable water conservancy construction management system. The cooperation between enterprises and local major customers has been upgraded from a single project to a deep strategic binding, the market territory has been continuously expanded, and the development model has completely broken away from the traditional single infrastructure track and transformed into a comprehensive service provider providing integrated water safety solutions.
Water moistens Chang'an for thousands of years, and practical work continues to write a new chapter. At present, various water conservancy projects are steadily advancing and the results are becoming more and more obvious. In the future, China Railway First Bureau will continue to base itself on the land of Sanqin, give full play to the advantages of water conservancy technology in the whole chain, cultivate more regional water conservancy construction markets, and continuously consolidate the foundation of urban water safety with the responsibility and ingenuity of central enterprises.
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