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On June 29, with the high-speed rail train departing from Wuwei East Station, the Lanzhou-Wuwei section of the newly built Lanzhou-Zhangye 34-line railway with the participation of China State Construction was officially completed and opened to traffic, helping the Lanzhou-Zhangye 34-line railway to achieve partial operation.
Ingenuity to build the "Belt and Road"
The Lanzhou-Zhangye Line 34 Railway starts from Lanzhou West Railway Station, passes through Wuwei City and Jinchang City, and finally introduces Zhangye West Railway Station, with a total length of 518 kilometers and a design speed of 250 kilometers per hour. The total length of the bid section is 49.092km, and the main construction content includes 22.690km of roadbed, 9 bridges, 10 continuous beams, 586 frame beams, and 1 Wuwei East Station. After the opening of the Lanzhou-Wuwei section, the travel time between the two places will be shortened to less than 2 hours. After the Lanzhang 34 Line is fully opened to traffic, it will become the second high-speed rail corridor from Lanzhou to Xinjiang after the Lanzhou-Xinjiang high-speed railway, which is of great significance for further improving the high-speed railway network in the western part of the mainland and driving the regional economic development along the line.
The opening of the Lanwu section of the Lanzhang high-speed railway will give new life to the ancient Silk Road, make the people's expectations for high-speed rail come true for many years, greatly improve the level of opening up of the Hexi Corridor, and inject strong impetus into future development. As a key line of the "Belt and Road", the Hexi Corridor will become the main channel for external transportation of Wuwei City, Jinchang City, Zhangye City and various districts and counties along the line after the Lanzhang High-speed Railway is fully opened to traffic, which can accelerate the flow and conversion of people and materials, drive the rapid development of regional tourism and agriculture, and provide a strong transportation guarantee for regional rural revitalization and high-quality economic development. The opening of the Lanzhang high-speed railway, the southwest will be connected with the Lanxin high-speed railway, the southeast will be connected with the Baolan high-speed railway, and the northeast will be connected with the Yinlan high-speed railway, forming a new pattern of interconnection network and regionalized coordinated development, and promoting the comprehensive and rapid development of the regional economy and society.
Overcome difficulties and achieve high-quality performance
The pouring of the first pier of the whole line was completed, the pouring of the first beam of the whole line was completed, and the first box girder of the whole line was successfully erected...... Since the start of the project, the Lanzhang project, which has been advancing all the way, is about to be stumped by the construction of steel cap girder erection across the business line.
At the time of the golden period of project construction, according to the construction plan, there are only more than 60 beams left in the direction of large mileage, after the erection of the beam machine will turn around and erect the box girder in the direction of small mileage, and the steel cap beam erection across the business line is the key card control point in the channel of the beam erection in the direction of small mileage, which is the project with the highest safety risk and the greatest construction difficulty in all the construction of the entire bid section of the Lanzhang project.
The Liangzhou No. 2 extra-large bridge crosses the business line and the Ganwu Railway at 29°, with a large span of the cap beam, heavy weight and high difficulty coefficient of hoisting. In order to improve the construction efficiency, the project changed the cast-in-place rotating beam to a portal pier steel cap beam + simply supported beam, so as to realize the synchronous construction of the substructure and the steel cap beam, and save costs while shortening the construction period. In order to ensure that the erection was completed within the 110-minute skylight period on the day of erection, the project was carefully prepared, a special construction plan was formulated, a steel cap beam hoisting working group was established, construction seminars were held many times, and personnel and equipment test hoisting drills were carried out in advance. In the end, the smooth pouring of the portal pier across the Ganwu Railway was successfully completed during the 110-minute construction skylight period, and the key control points in the first erection direction beam channel were successfully opened.
The construction of continuous beams across the north high-speed is the key control project of the entire bid section of the Lanzhang project, and it is the single project with the most complex procedures, the largest span and the largest volume among the ten continuous beams in the bid section, and it is also the "roadblock" on the girder passage of the bid section.
The original design of the continuous beam across the North Expressway was 64m, and the property rights unit of the Beixian Expressway refused to enter the project for construction on the grounds that it did not meet the widening requirements and the existence of safety risks, and requested that the span be adjusted to 80m, after the project for up to 10 months in the Provincial Department of Transportation, the design institute, the property rights unit, the owner unit and other institutions of back and forth, after continuous optimization of the construction plan, refinement of the construction process, and the organization of expert demonstration, the 64m continuous beam was finally successfully changed to an 80m continuous beam. After the completion of the design change, the organization of construction has become the focus of the project, due to the dense traffic flow of the Beixian Expressway, in order to ensure the safety of highway driving, the project adopts the hanging basket cantilever cast-in-place construction, and the closing sequence is the first middle span and then the side span, and the attached hanging basket is independently developed to replace the original rigid scaffolding protection, and at the same time, there is no interference with the traffic under the bridge, the construction of the closing dragon is completed safely, accurately and efficiently, and has been awarded the national utility model patent.
In the more than four years since the project entered the site, many nodes have led the whole line, won more than 50 internal and external honors, won 38 letters of commendation at all levels, and were rated as "Advanced Construction Project Department" and "Excellent Project of Railway Construction Safety" by the owner.
Scientific and technological research to create a railway benchmark
Contribute new achievements and explore new paths. The project also focuses on technological innovation and leadership, continuously strengthens scientific and technological support capabilities, actively explores new technologies for the construction of railway bridges and roadbeds, deeply integrates artificial intelligence technology with construction technology, and continuously empowers enterprises to develop railway business.
Walking into the intelligent beam yard of Liangzhou beam making field, the screen displays 6 major areas such as tension area, maintenance area, and testing area, only to see all kinds of machines running automatically, roaring in the ears, and steel bar processing is welded by robots to realize automatic streamlining operations. Scientific and technological innovation bids farewell to "one body of ash", and the work efficiency of the intelligent beam field is tripled. In the past, the traditional beam-making method was adopted, the dust was diffuse, the noise was huge, and the labor multi-work efficiency was low. Nowadays, the intelligent beam field of the project construction is green and clean and tidy, and it also implements a new model of Internet of Things + box girder intelligent construction through the automatic modeling technology of BIM technology, with high modeling efficiency, automatic output of the blanking table, and strong traceability, which can not only be connected with the steel processing machine interface to achieve automatic processing, but also automatically complete the production of all types of steel bars on the operating platform, and at the same time realize the intelligent process of steel bar production, transportation, loading and unloading, etc., the construction data will be connected to the railway construction management platform in real time. Remote monitoring of prestressed steel bar tension reduces 1/3 of labor input, and improves the efficiency of steel bar processing by 2 times.
In order to strengthen the guidance, control and early warning in the construction of subgrade rolling, the project cooperated with Central South University to carry out in-depth research and development of school-enterprise co-construction projects, explore the intelligent compaction construction technology of subgrade, and upload construction data to the cloud server in real time through Beidou + GPS positioning system and vibration sensors and other equipment, so as to ensure reliable quality control, improve management efficiency, and effectively shorten the construction period by 15%.
Since the start of the project, a total of 2 SCI/EI papers have been published. 10 national core journal papers; 3 invention patents and 9 utility model patents have been declared; Won 1 "Third Prize" of the Central and Western BIM League, 3 construction methods of the group and 1 excellent patent of the group; Jointly carried out 2 research projects with universities.
Over the past 40 years of reform and opening up, China's high-speed rail has undergone a transformation from less to more, from catching up to leading, and from being able to go well to going well. Today, China's high-speed railways have crossed mountains and mountains and reached rivers and seas, ranking first in the world in terms of operating mileage, and the national high-speed rail network has covered more than 90% of cities with a population of more than 1 million. It has run out of China's speed and will continue to lead the world. The builders of China Construction Railway Investment will devote themselves to the construction of the railway with more scientific management, higher and new technology and a more high-spirited attitude, so as to contribute to the grand blueprint of the motherland's "transportation power and railway first", so that the "new Silk Road" drawn by China Construction Blue will be longer and farther.
Text丨Rushing News reporter Cai Duan
Picture & Video丨Provided by China State Construction Engineering Co., Ltd