China Railway Equipment's first super large diameter mud water shield smoothly went offline

China Railway Equipment Co., Ltd. was the first super-large-diameter mud-water shield--China Railway No. 297 was successfully rolled off the Zhengzhou base. The equipment will be used in the Jingshenke Special Wangjing Tunnel Project, with a shield excavation diameter of 10.90 meters. This is also the shield equipment of China Railway Equipment Shield Equipment after the Baihua Tunnel Project of Menghua Railway and the southwestern ring road of Taiyuan Railway Hub. It is another shield equipment that has been put into the railway tunnel project, marking the further extension of the application field of China Railway Equipment Shield Machine.

Its downline marks a key step in the manufacture of large-diameter mud-water shields in China.

The construction of the Beijing Shenke Special 13th Biaojing Tunnel Project is under the responsibility of the China Railway Tunnel Group. The project is located in Chaoyang District, Beijing. It is a control project of the Beijing section of Beijing-Shenyang High-speed Railway. It concentrates on the difficulties in the project. For example, the tunnel construction shield section needs to use a shield machine with a diameter of 10.90 meters to continuously dig 3680 meters. In the case of maintenance wells, each system and components of the shield machine must have high reliability and long service life. At the same time, the bearing capacity of the arched roof at the origin of the shield is poor, covering soil is only 10.50 meters, which is smaller than the diameter of the shield machine; there is inter-layer water retention in the tunnel section of the receiving section, which increases the risk of shield construction; After the aircraft is launched, it will wear Vietnamese Kushiro and Box Tunnels, Capital Airport Expressway, Capital Airport Expressway, Airport Express Rail, and many residential areas and tall buildings. The safety risks are enormous.

In order to effectively improve the geological adaptability of the equipment and assist the tunneling of Wangjing Tunnel, the design and development personnel of China Railway Equipment Engineering went deep into the project site to detect geological conditions, comprehensively analyze the difficult and difficult problems of the excavation site, and carried out targeted design. They designed the shield cutterhead into a spoke structure and provided auxiliary equipment equipped with a full-track scouring system for the cutterhead to reduce the probability of the slag adhering to the cutterhead. The composite steel plate fully covered cutterhead design, layered layout cutter, plus Measures such as thick circulation system mud pipes to enhance the wear resistance of key components. In addition, in order to control the surface settlement, the design adopts the principle of pneumatic balance, and advances a certain width of the advanced reinforcement and horizontal reinforcement channels, supplemented by a synchronous two-liquid grouting system to reduce the probability of surface settlement.

It is understood that China Railway No. 297 will serve in the Beijing-Shenyang Railway Passenger Dedicated Line Beijing section of the front of the project, which is located in the Chaoyang District of Beijing, the line from the Caogezhuang Township Caochang Village, to the south side of Xiangjiang North Road It is adjacent to the Beijing-Baotou Railway, and the line runs from north to south. The Wangjing Tunnel, the key project of the tender section, enters the underground from the north side of the grassland, and passes through the Capital Airport Expressway, Airport Expressway, and Jingmi Road.

In recent years, China Railway Equipment Shield Equipment has been widely used in urban tunnels, underground pipe corridors and subway tunnel projects. On this basis, China Railway Equipment actively developed the shield application equipment field, and successively developed and designed the world's first horseshoe-shaped shield machine for railway tunnels, the largest diameter earth pressure balance shield machine independently developed in China, and the large-diameter mud-water balance shield. The machine not only realizes the expansion of the application field of shield equipment, but also realizes the diversification of the types of shield equipment used in the field of railway tunnel engineering and the breakthrough of technical content, which provides a powerful demonstration case for the construction of railway tunnel engineering in China.

Background information

Beijing-Shenyang High-speed Railway is an important route connecting the Beijing-Tianjin-Hebei region with the old industrial base in the northeast region. It passes through Beijing, Chengde City, Hebei Province, Chaoyang City, Fuxin City, Shenyang City, Shenyang City, and finally reaches Shenyang Station. The total length of the line is about 700 kilometers. The line design has a speed of 350 kilometers per hour and is the second fast railway passageway to the northeast region. After the completion of the project, the economic ties between Beijing and Shenyang will be closer. At the same time, as an important part of China's â€œfour vertical and four horizontalâ€ rapid railway network, Beijing-Shenyang high-speed railway connects Changchun and Harbin from Shenyang to the northeast, which can alleviate the transportation pressure of existing entry channels.

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